/*
This file is part of GNUnet.
- (C) 2010, 2012 Christian Grothoff
+ Copyright (C) 2010-2013, 2017 Christian Grothoff
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
* @file exit/gnunet-daemon-exit.c
- * @brief tool to allow IP traffic exit from the GNUnet mesh to the Internet
+ * @brief tool to allow IP traffic exit from the GNUnet cadet to the Internet
* @author Philipp Toelke
* @author Christian Grothoff
*
* - which code should advertise services? the service model is right
* now a bit odd, especially as this code DOES the exit and knows
* the DNS "name", but OTOH this is clearly NOT the place to advertise
- * the service's existence; maybe the daemon should turn into a
+ * the service's existence; maybe the daemon should turn into a
* service with an API to add local-exit services dynamically?
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_applications.h"
-#include "gnunet_mesh_service.h"
+#include "gnunet_dht_service.h"
+#include "gnunet_cadet_service.h"
#include "gnunet_dnsparser_lib.h"
#include "gnunet_dnsstub_lib.h"
#include "gnunet_statistics_service.h"
#include "gnunet_constants.h"
+#include "gnunet_signatures.h"
#include "gnunet_tun_lib.h"
#include "gnunet_regex_service.h"
#include "exit.h"
+#include "block_dns.h"
+
/**
- * Maximum path compression length for mesh regex announcing for IPv4 address
+ * Maximum path compression length for cadet regex announcing for IPv4 address
* based regex.
*/
#define REGEX_MAX_PATH_LEN_IPV4 4
/**
- * Maximum path compression length for mesh regex announcing for IPv6 address
+ * Maximum path compression length for cadet regex announcing for IPv6 address
* based regex.
*/
#define REGEX_MAX_PATH_LEN_IPV6 8
*/
#define REGEX_REFRESH_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 30)
+/**
+ * How frequently do we re-announce the DNS exit in the DHT?
+ */
+#define DHT_PUT_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
+
+/**
+ * How long do we typically sign the DNS exit advertisement for?
+ */
+#define DNS_ADVERTISEMENT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 3)
+
+
/**
* Generic logging shorthand
*/
*/
struct in6_addr ipv6;
} address;
-
+
/**
* IPPROTO_TCP or IPPROTO_UDP;
*/
};
+
/**
* This struct is saved into the services-hashmap to represent
* a service this peer is specifically offering an exit for
*/
struct SocketAddress address;
+ /**
+ * Descriptor for the service (CADET port).
+ */
+ struct GNUNET_HashCode descriptor;
+
/**
* DNS name of the service.
*/
char *name;
/**
- * Port I am listening on within GNUnet for this service, in host
- * byte order. (as we may redirect ports).
+ * Open port with CADET.
+ */
+ struct GNUNET_CADET_Port *port;
+
+ /**
+ * #GNUNET_YES if this is a UDP service, otherwise TCP.
*/
- uint16_t my_port;
+ int16_t is_udp;
};
+
/**
* Information we use to track a connection (the classical 6-tuple of
* IP-version, protocol, source-IP, destination-IP, source-port and
* destinatin-port.
*/
-struct RedirectInformation
+struct RedirectInformation
{
/**
*/
struct SocketAddress local_address;
- /*
+ /*
Note 1: additional information might be added here in the
future to support protocols that require special handling,
- such as ftp/tftp
+ such as ftp/tftp
Note 2: we might also sometimes not match on all components
of the tuple, to support protocols where things do not always
/**
- * Queue of messages to a tunnel.
- */
-struct TunnelMessageQueue
-{
- /**
- * This is a doubly-linked list.
- */
- struct TunnelMessageQueue *next;
-
- /**
- * This is a doubly-linked list.
- */
- struct TunnelMessageQueue *prev;
-
- /**
- * Payload to send via the tunnel.
- */
- const void *payload;
-
- /**
- * Number of bytes in 'payload'.
- */
- size_t len;
-};
-
-
-/**
- * This struct is saved into connections_map to allow finding the
- * right tunnel given an IP packet from TUN. It is also associated
- * with the tunnel's closure so we can find it again for the next
- * message from the tunnel.
+ * This struct is saved into #connections_map to allow finding the
+ * right channel given an IP packet from TUN. It is also associated
+ * with the channel's closure so we can find it again for the next
+ * message from the channel.
*/
-struct TunnelState
+struct ChannelState
{
/**
- * Mesh tunnel that is used for this connection.
+ * Cadet channel that is used for this connection.
*/
- struct GNUNET_MESH_Tunnel *tunnel;
+ struct GNUNET_CADET_Channel *channel;
/**
- * Who is the other end of this tunnel.
+ * Who is the other end of this channel.
* FIXME is this needed? Only used for debugging messages
*/
struct GNUNET_PeerIdentity peer;
/**
- * Active tunnel transmission request (or NULL).
- */
- struct GNUNET_MESH_TransmitHandle *th;
-
- /**
- * GNUNET_NO if this is a tunnel for TCP/UDP,
- * GNUNET_YES if this is a tunnel for DNS,
- * GNUNET_SYSERR if the tunnel is not yet initialized.
+ * #GNUNET_NO if this is a channel for TCP/UDP,
+ * #GNUNET_YES if this is a channel for DNS,
+ * #GNUNET_SYSERR if the channel is not yet initialized.
*/
int is_dns;
- union
+ union
{
- struct
+ struct
{
/**
* Heap node for this state in the connections_heap.
*/
struct GNUNET_CONTAINER_HeapNode *heap_node;
-
+
/**
- * Key this state has in the connections_map.
+ * Key this state has in the #connections_map.
*/
struct GNUNET_HashCode state_key;
-
+
/**
* Associated service record, or NULL for no service.
*/
struct LocalService *serv;
-
- /**
- * Head of DLL of messages for this tunnel.
- */
- struct TunnelMessageQueue *head;
-
- /**
- * Tail of DLL of messages for this tunnel.
- */
- struct TunnelMessageQueue *tail;
-
+
/**
* Primary redirection information for this connection.
*/
struct
{
- /**
- * DNS reply ready for transmission.
- */
- char *reply;
-
/**
* Socket we are using to transmit this request (must match if we receive
* a response).
*/
struct GNUNET_DNSSTUB_RequestSocket *rs;
-
- /**
- * Number of bytes in 'reply'.
- */
- size_t reply_length;
-
+
/**
* Original DNS request ID as used by the client.
*/
uint16_t original_id;
-
+
/**
* DNS request ID that we used for forwarding.
*/
uint16_t my_id;
-
+
} dns;
} specifics;
static struct GNUNET_STATISTICS_Handle *stats;
/**
- * The handle to mesh
+ * The handle to cadet
*/
-static struct GNUNET_MESH_Handle *mesh_handle;
+static struct GNUNET_CADET_Handle *cadet_handle;
/**
* This hashmaps contains the mapping from peer, service-descriptor,
- * source-port and destination-port to a struct TunnelState
+ * source-port and destination-port to a struct ChannelState
*/
static struct GNUNET_CONTAINER_MultiHashMap *connections_map;
static unsigned long long max_connections;
/**
- * This hashmaps saves interesting things about the configured UDP services
+ * This hashmaps saves interesting things about the configured services
+ */
+static struct GNUNET_CONTAINER_MultiHashMap *services;
+
+/**
+ * Array of all open DNS requests from channels.
*/
-static struct GNUNET_CONTAINER_MultiHashMap *udp_services;
+static struct ChannelState *channels[UINT16_MAX + 1];
/**
- * This hashmaps saves interesting things about the configured TCP services
+ * Handle to the DNS Stub resolver.
*/
-static struct GNUNET_CONTAINER_MultiHashMap *tcp_services;
+static struct GNUNET_DNSSTUB_Context *dnsstub;
/**
- * Array of all open DNS requests from tunnels.
+ * Handle for ongoing DHT PUT operations to advertise exit service.
*/
-static struct TunnelState *tunnels[UINT16_MAX + 1];
+static struct GNUNET_DHT_PutHandle *dht_put;
/**
- * Handle to the DNS Stub resolver.
+ * Handle to the DHT.
*/
-static struct GNUNET_DNSSTUB_Context *dnsstub;
+static struct GNUNET_DHT_Handle *dht;
+
+/**
+ * Task for doing DHT PUTs to advertise exit service.
+ */
+static struct GNUNET_SCHEDULER_Task *dht_task;
+
+/**
+ * Advertisement message we put into the DHT to advertise us
+ * as a DNS exit.
+ */
+static struct GNUNET_DNS_Advertisement dns_advertisement;
+
+/**
+ * Key we store the DNS advertismenet under.
+ */
+static struct GNUNET_HashCode dht_put_key;
+
+/**
+ * Private key for this peer.
+ */
+static struct GNUNET_CRYPTO_EddsaPrivateKey *peer_key;
+
+/**
+ * Port for DNS exit.
+ */
+static struct GNUNET_CADET_Port *dns_port;
+
+/**
+ * Port for IPv4 exit.
+ */
+static struct GNUNET_CADET_Port *cadet_port4;
+
+/**
+ * Port for IPv6 exit.
+ */
+static struct GNUNET_CADET_Port *cadet_port6;
/**
* Are we an IPv4-exit?
static int ipv6_enabled;
+GNUNET_NETWORK_STRUCT_BEGIN
+
/**
- * We got a reply from DNS for a request of a MESH tunnel. Send it
- * via the tunnel (after changing the request ID back).
- *
- * @param cls the 'struct TunnelState'
- * @param size number of bytes available in buf
- * @param buf where to copy the reply
- * @return number of bytes written to buf
- */
-static size_t
-transmit_reply_to_mesh (void *cls,
- size_t size,
- void *buf)
+ * Message with a DNS response.
+ */
+struct DnsResponseMessage
{
- struct TunnelState *ts = cls;
- size_t off;
- size_t ret;
- char *cbuf = buf;
- struct GNUNET_MessageHeader hdr;
+ /**
+ * GNUnet header, of type #GNUNET_MESSAGE_TYPE_VPN_DNS_FROM_INTERNET
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * DNS header.
+ */
struct GNUNET_TUN_DnsHeader dns;
- GNUNET_assert (GNUNET_YES == ts->is_dns);
- ts->th = NULL;
- GNUNET_assert (ts->specifics.dns.reply != NULL);
- if (size == 0)
- return 0;
- ret = sizeof (struct GNUNET_MessageHeader) + ts->specifics.dns.reply_length;
- GNUNET_assert (ret <= size);
- hdr.size = htons (ret);
- hdr.type = htons (GNUNET_MESSAGE_TYPE_VPN_DNS_FROM_INTERNET);
- memcpy (&dns, ts->specifics.dns.reply, sizeof (dns));
- dns.id = ts->specifics.dns.original_id;
- off = 0;
- memcpy (&cbuf[off], &hdr, sizeof (hdr));
- off += sizeof (hdr);
- memcpy (&cbuf[off], &dns, sizeof (dns));
- off += sizeof (dns);
- memcpy (&cbuf[off], &ts->specifics.dns.reply[sizeof (dns)], ts->specifics.dns.reply_length - sizeof (dns));
- off += ts->specifics.dns.reply_length - sizeof (dns);
- GNUNET_free (ts->specifics.dns.reply);
- ts->specifics.dns.reply = NULL;
- ts->specifics.dns.reply_length = 0;
- GNUNET_assert (ret == off);
- return ret;
-}
+ /* Followed by more DNS payload */
+};
+
+GNUNET_NETWORK_STRUCT_END
/**
* @param cls NULL
* @param rs the socket that received the response
* @param dns the response itself
- * @param r number of bytes in dns
+ * @param r number of bytes in @a dns
*/
static void
process_dns_result (void *cls,
const struct GNUNET_TUN_DnsHeader *dns,
size_t r)
{
- struct TunnelState *ts;
+ struct ChannelState *ts;
+ struct GNUNET_MQ_Envelope *env;
+ struct DnsResponseMessage *resp;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Processing DNS result from stub resolver\n");
GNUNET_assert (NULL == cls);
- /* Handle case that this is a reply to a request from a MESH DNS tunnel */
- ts = tunnels[dns->id];
+ /* Handle case that this is a reply to a request from a CADET DNS channel */
+ ts = channels[dns->id];
if ( (NULL == ts) ||
(ts->specifics.dns.rs != rs) )
return;
LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Got a response from the stub resolver for DNS request received via MESH!\n");
- tunnels[dns->id] = NULL;
- GNUNET_free_non_null (ts->specifics.dns.reply);
- ts->specifics.dns.reply = GNUNET_malloc (r);
- ts->specifics.dns.reply_length = r;
- memcpy (ts->specifics.dns.reply, dns, r);
- if (NULL != ts->th)
- GNUNET_MESH_notify_transmit_ready_cancel (ts->th);
- ts->th = GNUNET_MESH_notify_transmit_ready (ts->tunnel,
- GNUNET_NO,
- GNUNET_TIME_UNIT_FOREVER_REL,
- sizeof (struct GNUNET_MessageHeader) + r,
- &transmit_reply_to_mesh,
- ts);
+ "Got a response from the stub resolver for DNS request received via CADET!\n");
+ channels[dns->id] = NULL;
+ env = GNUNET_MQ_msg_extra (resp,
+ r - sizeof (struct GNUNET_TUN_DnsHeader),
+ GNUNET_MESSAGE_TYPE_VPN_DNS_FROM_INTERNET);
+ GNUNET_memcpy (&resp->dns,
+ dns,
+ r);
+ resp->dns.id = ts->specifics.dns.original_id;
+ GNUNET_MQ_send (GNUNET_CADET_get_mq (ts->channel),
+ env);
}
/**
- * Process a request via mesh to perform a DNS query.
+ * Check a request via cadet to perform a DNS query.
*
- * @param cls closure, NULL
- * @param tunnel connection to the other end
- * @param tunnel_ctx pointer to our 'struct TunnelState *'
- * @param message the actual message
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
+ * @param cls our `struct ChannelState *`
+ * @param msg the actual message
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
*/
static int
-receive_dns_request (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
- void **tunnel_ctx,
- const struct GNUNET_MessageHeader *message)
+check_dns_request (void *cls,
+ const struct DnsResponseMessage *msg)
{
- struct TunnelState *ts = *tunnel_ctx;
- const struct GNUNET_TUN_DnsHeader *dns;
- size_t mlen = ntohs (message->size);
- size_t dlen = mlen - sizeof (struct GNUNET_MessageHeader);
- char buf[dlen] GNUNET_ALIGN;
- struct GNUNET_TUN_DnsHeader *dout;
+ struct ChannelState *ts = cls;
if (NULL == dnsstub)
+ {
+ GNUNET_break (0);
return GNUNET_SYSERR;
+ }
if (GNUNET_NO == ts->is_dns)
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
+ return GNUNET_OK;
+}
+
+
+/**
+ * Process a request via cadet to perform a DNS query.
+ *
+ * @param cls our `struct ChannelState *`
+ * @param msg the actual message
+ */
+static void
+handle_dns_request (void *cls,
+ const struct DnsResponseMessage *msg)
+{
+ struct ChannelState *ts = cls;
+ size_t mlen = ntohs (msg->header.size);
+ size_t dlen = mlen - sizeof (struct GNUNET_MessageHeader);
+ char buf[dlen] GNUNET_ALIGN;
+ struct GNUNET_TUN_DnsHeader *dout;
+
if (GNUNET_SYSERR == ts->is_dns)
{
- /* tunnel is DNS from now on */
+ /* channel is DNS from now on */
ts->is_dns = GNUNET_YES;
}
- if (dlen < sizeof (struct GNUNET_TUN_DnsHeader))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- dns = (const struct GNUNET_TUN_DnsHeader *) &message[1];
- ts->specifics.dns.original_id = dns->id;
- if (tunnels[ts->specifics.dns.my_id] == ts)
- tunnels[ts->specifics.dns.my_id] = NULL;
- ts->specifics.dns.my_id = (uint16_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
- UINT16_MAX + 1);
- tunnels[ts->specifics.dns.my_id] = ts;
- memcpy (buf, dns, dlen);
+ ts->specifics.dns.original_id = msg->dns.id;
+ if (channels[ts->specifics.dns.my_id] == ts)
+ channels[ts->specifics.dns.my_id] = NULL;
+ ts->specifics.dns.my_id = (uint16_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+ UINT16_MAX + 1);
+ channels[ts->specifics.dns.my_id] = ts;
+ GNUNET_memcpy (buf,
+ &msg->dns,
+ dlen);
dout = (struct GNUNET_TUN_DnsHeader *) buf;
dout->id = ts->specifics.dns.my_id;
ts->specifics.dns.rs = GNUNET_DNSSTUB_resolve2 (dnsstub,
- buf, dlen,
+ buf,
+ dlen,
&process_dns_result,
NULL);
if (NULL == ts->specifics.dns.rs)
- return GNUNET_SYSERR;
- return GNUNET_OK;
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ GNUNET_CADET_receive_done (ts->channel);
}
/**
* Given IP information about a connection, calculate the respective
- * hash we would use for the 'connections_map'.
+ * hash we would use for the #connections_map.
*
* @param hash resulting hash
* @param ri information about the connection
*/
static void
-hash_redirect_info (struct GNUNET_HashCode *hash,
+hash_redirect_info (struct GNUNET_HashCode *hash,
const struct RedirectInformation *ri)
{
char *off;
- memset (hash, 0, sizeof (struct GNUNET_HashCode));
+ memset (hash,
+ 0,
+ sizeof (struct GNUNET_HashCode));
/* the GNUnet hashmap only uses the first sizeof(unsigned int) of the hash,
so we put the IP address in there (and hope for few collisions) */
off = (char*) hash;
switch (ri->remote_address.af)
{
case AF_INET:
- memcpy (off, &ri->remote_address.address.ipv4, sizeof (struct in_addr));
+ GNUNET_memcpy (off,
+ &ri->remote_address.address.ipv4,
+ sizeof (struct in_addr));
off += sizeof (struct in_addr);
break;
case AF_INET6:
- memcpy (off, &ri->remote_address.address.ipv6, sizeof (struct in6_addr));
+ GNUNET_memcpy (off,
+ &ri->remote_address.address.ipv6,
+ sizeof (struct in6_addr));
off += sizeof (struct in_addr);
break;
default:
GNUNET_assert (0);
}
- memcpy (off, &ri->remote_address.port, sizeof (uint16_t));
+ GNUNET_memcpy (off,
+ &ri->remote_address.port,
+ sizeof (uint16_t));
off += sizeof (uint16_t);
switch (ri->local_address.af)
{
case AF_INET:
- memcpy (off, &ri->local_address.address.ipv4, sizeof (struct in_addr));
+ GNUNET_memcpy (off,
+ &ri->local_address.address.ipv4,
+ sizeof (struct in_addr));
off += sizeof (struct in_addr);
break;
case AF_INET6:
- memcpy (off, &ri->local_address.address.ipv6, sizeof (struct in6_addr));
+ GNUNET_memcpy (off,
+ &ri->local_address.address.ipv6,
+ sizeof (struct in6_addr));
off += sizeof (struct in_addr);
break;
default:
GNUNET_assert (0);
}
- memcpy (off, &ri->local_address.port, sizeof (uint16_t));
+ GNUNET_memcpy (off,
+ &ri->local_address.port,
+ sizeof (uint16_t));
off += sizeof (uint16_t);
- memcpy (off, &ri->remote_address.proto, sizeof (uint8_t));
- off += sizeof (uint8_t);
+ GNUNET_memcpy (off,
+ &ri->remote_address.proto,
+ sizeof (uint8_t));
+ /* off += sizeof (uint8_t); */
}
* @param state_key set to hash's state if non-NULL
* @return NULL if we have no tracking information for this tuple
*/
-static struct TunnelState *
+static struct ChannelState *
get_redirect_state (int af,
- int protocol,
+ int protocol,
const void *destination_ip,
uint16_t destination_port,
const void *local_ip,
{
struct RedirectInformation ri;
struct GNUNET_HashCode key;
- struct TunnelState *state;
+ struct ChannelState *state;
if ( ( (af == AF_INET) && (protocol == IPPROTO_ICMP) ) ||
( (af == AF_INET6) && (protocol == IPPROTO_ICMPV6) ) )
ri.local_address.address.ipv6 = * ((struct in6_addr*) local_ip);
ri.local_address.port = local_port;
ri.local_address.proto = protocol;
- hash_redirect_info (&key, &ri);
+ hash_redirect_info (&key,
+ &ri);
if (NULL != state_key)
*state_key = key;
- state = GNUNET_CONTAINER_multihashmap_get (connections_map, &key);
+ state = GNUNET_CONTAINER_multihashmap_get (connections_map,
+ &key);
if (NULL == state)
return NULL;
/* Mark this connection as freshly used */
if (NULL == state_key)
- GNUNET_CONTAINER_heap_update_cost (connections_heap,
- state->specifics.tcp_udp.heap_node,
- GNUNET_TIME_absolute_get ().abs_value);
+ GNUNET_CONTAINER_heap_update_cost (state->specifics.tcp_udp.heap_node,
+ GNUNET_TIME_absolute_get ().abs_value_us);
return state;
}
-/**
- * Given a service descriptor and a destination port, find the
- * respective service entry.
- *
- * @param service_map map of services (TCP or UDP)
- * @param desc service descriptor
- * @param destination_port destination port
- * @return NULL if we are not aware of such a service
- */
-static struct LocalService *
-find_service (struct GNUNET_CONTAINER_MultiHashMap *service_map,
- const struct GNUNET_HashCode *desc,
- uint16_t destination_port)
-{
- char key[sizeof (struct GNUNET_HashCode) + sizeof (uint16_t)];
-
- memcpy (&key[0], &destination_port, sizeof (uint16_t));
- memcpy (&key[sizeof(uint16_t)], desc, sizeof (struct GNUNET_HashCode));
- return GNUNET_CONTAINER_multihashmap_get (service_map,
- (struct GNUNET_HashCode *) key);
-}
-
/**
- * Free memory associated with a service record.
+ * Check a request via cadet to send a request to a TCP service
+ * offered by this system.
*
- * @param cls unused
- * @param key service descriptor
- * @param value service record to free
- * @return GNUNET_OK
+ * @param cls our `struct ChannelState *`
+ * @param start the actual message
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
*/
static int
-free_service_record (void *cls,
- const struct GNUNET_HashCode *key,
- void *value)
+check_tcp_service (void *cls,
+ const struct GNUNET_EXIT_TcpServiceStartMessage *start)
{
- struct LocalService *service = value;
+ struct ChannelState *state = cls;
- GNUNET_free_non_null (service->name);
- GNUNET_free (service);
+ if (NULL == state)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_YES == state->is_dns)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (NULL == state->specifics.tcp_udp.serv)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (NULL != state->specifics.tcp_udp.heap_node)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (start->tcp_header.off * 4 < sizeof (struct GNUNET_TUN_TcpHeader))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
return GNUNET_OK;
}
/**
- * Given a service descriptor and a destination port, find the
- * respective service entry.
+ * Prepare an IPv4 packet for transmission via the TUN interface.
+ * Initializes the IP header and calculates checksums (IP+UDP/TCP).
+ * For UDP, the UDP header will be fully created, whereas for TCP
+ * only the ports and checksum will be filled in. So for TCP,
+ * a skeleton TCP header must be part of the provided payload.
*
- * @param service_map map of services (TCP or UDP)
- * @param name name of the service
- * @param destination_port destination port
- * @param service service information record to store (service->name will be set).
+ * @param payload payload of the packet (starting with UDP payload or
+ * TCP header, depending on protocol)
+ * @param payload_length number of bytes in @a payload
+ * @param protocol IPPROTO_UDP or IPPROTO_TCP
+ * @param tcp_header skeleton of the TCP header, NULL for UDP
+ * @param src_address source address to use (IP and port)
+ * @param dst_address destination address to use (IP and port)
+ * @param pkt4 where to write the assembled packet; must
+ * contain enough space for the IP header, UDP/TCP header
+ * AND the payload
*/
static void
-store_service (struct GNUNET_CONTAINER_MultiHashMap *service_map,
- const char *name,
- uint16_t destination_port,
- struct LocalService *service)
+prepare_ipv4_packet (const void *payload,
+ size_t payload_length,
+ int protocol,
+ const struct GNUNET_TUN_TcpHeader *tcp_header,
+ const struct SocketAddress *src_address,
+ const struct SocketAddress *dst_address,
+ struct GNUNET_TUN_IPv4Header *pkt4)
{
- char key[sizeof (struct GNUNET_HashCode) + sizeof (uint16_t)];
- struct GNUNET_HashCode desc;
+ size_t len;
- GNUNET_CRYPTO_hash (name, strlen (name) + 1, &desc);
- service->name = GNUNET_strdup (name);
- memcpy (&key[0], &destination_port, sizeof (uint16_t));
- memcpy (&key[sizeof(uint16_t)], &desc, sizeof (struct GNUNET_HashCode));
- if (GNUNET_OK !=
- GNUNET_CONTAINER_multihashmap_put (service_map,
- (struct GNUNET_HashCode *) key,
- service,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
+ len = payload_length;
+ switch (protocol)
{
- free_service_record (NULL, (struct GNUNET_HashCode *) key, service);
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Got duplicate service records for `%s:%u'\n"),
- name,
- (unsigned int) destination_port);
+ case IPPROTO_UDP:
+ len += sizeof (struct GNUNET_TUN_UdpHeader);
+ break;
+ case IPPROTO_TCP:
+ len += sizeof (struct GNUNET_TUN_TcpHeader);
+ GNUNET_assert (NULL != tcp_header);
+ break;
+ default:
+ GNUNET_break (0);
+ return;
+ }
+ if (len + sizeof (struct GNUNET_TUN_IPv4Header) > UINT16_MAX)
+ {
+ GNUNET_break (0);
+ return;
}
-}
-
-/**
- * MESH is ready to receive a message for the tunnel. Transmit it.
- *
- * @param cls the 'struct TunnelState'.
- * @param size number of bytes available in buf
- * @param buf where to copy the message
- * @return number of bytes copied to buf
- */
-static size_t
-send_to_peer_notify_callback (void *cls, size_t size, void *buf)
-{
- struct TunnelState *s = cls;
- struct GNUNET_MESH_Tunnel *tunnel = s->tunnel;
- struct TunnelMessageQueue *tnq;
-
- s->th = NULL;
- tnq = s->specifics.tcp_udp.head;
- if (NULL == tnq)
- return 0;
- if (0 == size)
- {
- s->th = GNUNET_MESH_notify_transmit_ready (tunnel,
- GNUNET_NO /* corking */,
- GNUNET_TIME_UNIT_FOREVER_REL,
- tnq->len,
- &send_to_peer_notify_callback,
- s);
- return 0;
- }
- GNUNET_assert (size >= tnq->len);
- memcpy (buf, tnq->payload, tnq->len);
- size = tnq->len;
- GNUNET_CONTAINER_DLL_remove (s->specifics.tcp_udp.head,
- s->specifics.tcp_udp.tail,
- tnq);
- GNUNET_free (tnq);
- if (NULL != (tnq = s->specifics.tcp_udp.head))
- s->th = GNUNET_MESH_notify_transmit_ready (tunnel,
- GNUNET_NO /* corking */,
- GNUNET_TIME_UNIT_FOREVER_REL,
- tnq->len,
- &send_to_peer_notify_callback,
- s);
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# Bytes transmitted via mesh tunnels"),
- size, GNUNET_NO);
- return size;
-}
+ GNUNET_TUN_initialize_ipv4_header (pkt4,
+ protocol,
+ len,
+ &src_address->address.ipv4,
+ &dst_address->address.ipv4);
+ switch (protocol)
+ {
+ case IPPROTO_UDP:
+ {
+ struct GNUNET_TUN_UdpHeader *pkt4_udp = (struct GNUNET_TUN_UdpHeader *) &pkt4[1];
+ pkt4_udp->source_port = htons (src_address->port);
+ pkt4_udp->destination_port = htons (dst_address->port);
+ pkt4_udp->len = htons ((uint16_t) payload_length);
+ GNUNET_TUN_calculate_udp4_checksum (pkt4,
+ pkt4_udp,
+ payload,
+ payload_length);
+ GNUNET_memcpy (&pkt4_udp[1],
+ payload,
+ payload_length);
+ }
+ break;
+ case IPPROTO_TCP:
+ {
+ struct GNUNET_TUN_TcpHeader *pkt4_tcp = (struct GNUNET_TUN_TcpHeader *) &pkt4[1];
-/**
- * Send the given packet via the mesh tunnel.
- *
- * @param s tunnel destination
- * @param tnq message to queue
- */
-static void
-send_packet_to_mesh_tunnel (struct TunnelState *s,
- struct TunnelMessageQueue *tnq)
-{
- struct GNUNET_MESH_Tunnel *mesh_tunnel;
-
- mesh_tunnel = s->tunnel;
- GNUNET_assert (NULL != s);
- GNUNET_CONTAINER_DLL_insert_tail (s->specifics.tcp_udp.head, s->specifics.tcp_udp.tail, tnq);
- if (NULL == s->th)
- s->th = GNUNET_MESH_notify_transmit_ready (mesh_tunnel,
- GNUNET_NO /* cork */,
- GNUNET_TIME_UNIT_FOREVER_REL,
- tnq->len,
- &send_to_peer_notify_callback,
- s);
+ *pkt4_tcp = *tcp_header;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending TCP packet from port %u to port %u\n",
+ src_address->port,
+ dst_address->port);
+ pkt4_tcp->source_port = htons (src_address->port);
+ pkt4_tcp->destination_port = htons (dst_address->port);
+ GNUNET_TUN_calculate_tcp4_checksum (pkt4,
+ pkt4_tcp,
+ payload,
+ payload_length);
+ GNUNET_memcpy (&pkt4_tcp[1],
+ payload,
+ payload_length);
+ }
+ break;
+ default:
+ GNUNET_assert (0);
+ }
}
/**
- * @brief Handles an ICMP packet received from the helper.
+ * Prepare an IPv6 packet for transmission via the TUN interface.
+ * Initializes the IP header and calculates checksums (IP+UDP/TCP).
+ * For UDP, the UDP header will be fully created, whereas for TCP
+ * only the ports and checksum will be filled in. So for TCP,
+ * a skeleton TCP header must be part of the provided payload.
*
- * @param icmp A pointer to the Packet
- * @param pktlen number of bytes in 'icmp'
- * @param af address family (AFINET or AF_INET6)
- * @param destination_ip destination IP-address of the IP packet (should
- * be our local address)
- * @param source_ip original source IP-address of the IP packet (should
- * be the original destination address)
+ * @param payload payload of the packet (starting with UDP payload or
+ * TCP header, depending on protocol)
+ * @param payload_length number of bytes in @a payload
+ * @param protocol IPPROTO_UDP or IPPROTO_TCP
+ * @param tcp_header skeleton TCP header data to send, NULL for UDP
+ * @param src_address source address to use (IP and port)
+ * @param dst_address destination address to use (IP and port)
+ * @param pkt6 where to write the assembled packet; must
+ * contain enough space for the IP header, UDP/TCP header
+ * AND the payload
*/
static void
-icmp_from_helper (const struct GNUNET_TUN_IcmpHeader *icmp,
- size_t pktlen,
- int af,
- const void *destination_ip,
- const void *source_ip)
+prepare_ipv6_packet (const void *payload,
+ size_t payload_length,
+ int protocol,
+ const struct GNUNET_TUN_TcpHeader *tcp_header,
+ const struct SocketAddress *src_address,
+ const struct SocketAddress *dst_address,
+ struct GNUNET_TUN_IPv6Header *pkt6)
{
- struct TunnelState *state;
- struct TunnelMessageQueue *tnq;
- struct GNUNET_EXIT_IcmpToVPNMessage *i2v;
- const struct GNUNET_TUN_IPv4Header *ipv4;
- const struct GNUNET_TUN_IPv6Header *ipv6;
- const struct GNUNET_TUN_UdpHeader *udp;
- size_t mlen;
- uint16_t source_port;
- uint16_t destination_port;
- uint8_t protocol;
+ size_t len;
+ len = payload_length;
+ switch (protocol)
{
- char sbuf[INET6_ADDRSTRLEN];
- char dbuf[INET6_ADDRSTRLEN];
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received ICMP packet going from %s to %s\n",
- inet_ntop (af,
- source_ip,
- sbuf, sizeof (sbuf)),
- inet_ntop (af,
- destination_ip,
- dbuf, sizeof (dbuf)));
+ case IPPROTO_UDP:
+ len += sizeof (struct GNUNET_TUN_UdpHeader);
+ break;
+ case IPPROTO_TCP:
+ len += sizeof (struct GNUNET_TUN_TcpHeader);
+ break;
+ default:
+ GNUNET_break (0);
+ return;
}
- if (pktlen < sizeof (struct GNUNET_TUN_IcmpHeader))
+ if (len > UINT16_MAX)
{
- /* blame kernel */
GNUNET_break (0);
return;
}
- /* Find out if this is an ICMP packet in response to an existing
- TCP/UDP packet and if so, figure out ports / protocol of the
- existing session from the IP data in the ICMP payload */
- source_port = 0;
- destination_port = 0;
- switch (af)
- {
- case AF_INET:
- protocol = IPPROTO_ICMP;
- switch (icmp->type)
- {
- case GNUNET_TUN_ICMPTYPE_ECHO_REPLY:
- case GNUNET_TUN_ICMPTYPE_ECHO_REQUEST:
- break;
- case GNUNET_TUN_ICMPTYPE_DESTINATION_UNREACHABLE:
- case GNUNET_TUN_ICMPTYPE_SOURCE_QUENCH:
- case GNUNET_TUN_ICMPTYPE_TIME_EXCEEDED:
- if (pktlen <
- sizeof (struct GNUNET_TUN_IcmpHeader) +
- sizeof (struct GNUNET_TUN_IPv4Header) + 8)
- {
- /* blame kernel */
- GNUNET_break (0);
- return;
- }
- ipv4 = (const struct GNUNET_TUN_IPv4Header *) &icmp[1];
- protocol = ipv4->protocol;
- /* could be TCP or UDP, but both have the ports in the right
- place, so that doesn't matter here */
- udp = (const struct GNUNET_TUN_UdpHeader *) &ipv4[1];
- /* swap ports, as they are from the original message */
- destination_port = ntohs (udp->source_port);
- source_port = ntohs (udp->destination_port);
- /* throw away ICMP payload, won't be useful for the other side anyway */
- pktlen = sizeof (struct GNUNET_TUN_IcmpHeader);
- break;
- default:
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# ICMPv4 packets dropped (type not allowed)"),
- 1, GNUNET_NO);
- return;
- }
- break;
- case AF_INET6:
- protocol = IPPROTO_ICMPV6;
- switch (icmp->type)
- {
- case GNUNET_TUN_ICMPTYPE6_DESTINATION_UNREACHABLE:
- case GNUNET_TUN_ICMPTYPE6_PACKET_TOO_BIG:
- case GNUNET_TUN_ICMPTYPE6_TIME_EXCEEDED:
- case GNUNET_TUN_ICMPTYPE6_PARAMETER_PROBLEM:
- if (pktlen <
- sizeof (struct GNUNET_TUN_IcmpHeader) +
- sizeof (struct GNUNET_TUN_IPv6Header) + 8)
- {
- /* blame kernel */
- GNUNET_break (0);
- return;
- }
- ipv6 = (const struct GNUNET_TUN_IPv6Header *) &icmp[1];
- protocol = ipv6->next_header;
- /* could be TCP or UDP, but both have the ports in the right
- place, so that doesn't matter here */
- udp = (const struct GNUNET_TUN_UdpHeader *) &ipv6[1];
- /* swap ports, as they are from the original message */
- destination_port = ntohs (udp->source_port);
- source_port = ntohs (udp->destination_port);
- /* throw away ICMP payload, won't be useful for the other side anyway */
- pktlen = sizeof (struct GNUNET_TUN_IcmpHeader);
- break;
- case GNUNET_TUN_ICMPTYPE6_ECHO_REQUEST:
- case GNUNET_TUN_ICMPTYPE6_ECHO_REPLY:
- break;
- default:
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# ICMPv6 packets dropped (type not allowed)"),
- 1, GNUNET_NO);
- return;
- }
- break;
- default:
- GNUNET_assert (0);
- }
+ GNUNET_TUN_initialize_ipv6_header (pkt6,
+ protocol,
+ len,
+ &src_address->address.ipv6,
+ &dst_address->address.ipv6);
+
switch (protocol)
{
- case IPPROTO_ICMP:
- state = get_redirect_state (af, IPPROTO_ICMP,
- source_ip, 0,
- destination_ip, 0,
- NULL);
- break;
- case IPPROTO_ICMPV6:
- state = get_redirect_state (af, IPPROTO_ICMPV6,
- source_ip, 0,
- destination_ip, 0,
- NULL);
- break;
case IPPROTO_UDP:
- state = get_redirect_state (af, IPPROTO_UDP,
- source_ip,
- source_port,
- destination_ip,
- destination_port,
- NULL);
+ {
+ struct GNUNET_TUN_UdpHeader *pkt6_udp = (struct GNUNET_TUN_UdpHeader *) &pkt6[1];
+
+ pkt6_udp->source_port = htons (src_address->port);
+ pkt6_udp->destination_port = htons (dst_address->port);
+ pkt6_udp->len = htons ((uint16_t) payload_length);
+ GNUNET_TUN_calculate_udp6_checksum (pkt6,
+ pkt6_udp,
+ payload,
+ payload_length);
+ GNUNET_memcpy (&pkt6_udp[1],
+ payload,
+ payload_length);
+ }
break;
case IPPROTO_TCP:
- state = get_redirect_state (af, IPPROTO_TCP,
- source_ip,
- source_port,
- destination_ip,
- destination_port,
- NULL);
+ {
+ struct GNUNET_TUN_TcpHeader *pkt6_tcp = (struct GNUNET_TUN_TcpHeader *) &pkt6[1];
+
+ /* GNUNET_memcpy first here as some TCP header fields are initialized this way! */
+ *pkt6_tcp = *tcp_header;
+ pkt6_tcp->source_port = htons (src_address->port);
+ pkt6_tcp->destination_port = htons (dst_address->port);
+ GNUNET_TUN_calculate_tcp6_checksum (pkt6,
+ pkt6_tcp,
+ payload,
+ payload_length);
+ GNUNET_memcpy (&pkt6_tcp[1],
+ payload,
+ payload_length);
+ }
break;
default:
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# ICMP packets dropped (not allowed)"),
- 1, GNUNET_NO);
- return;
- }
- if (NULL == state)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("ICMP Packet dropped, have no matching connection information\n"));
- return;
+ GNUNET_assert (0);
+ break;
}
- mlen = sizeof (struct GNUNET_EXIT_IcmpToVPNMessage) + pktlen - sizeof (struct GNUNET_TUN_IcmpHeader);
- tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueue) + mlen);
- tnq->payload = &tnq[1];
- tnq->len = mlen;
- i2v = (struct GNUNET_EXIT_IcmpToVPNMessage *) &tnq[1];
- i2v->header.size = htons ((uint16_t) mlen);
- i2v->header.type = htons (GNUNET_MESSAGE_TYPE_VPN_ICMP_TO_VPN);
- i2v->af = htonl (af);
- memcpy (&i2v->icmp_header,
- icmp,
- pktlen);
- send_packet_to_mesh_tunnel (state, tnq);
}
/**
- * @brief Handles an UDP packet received from the helper.
+ * Send a TCP packet via the TUN interface.
*
- * @param udp A pointer to the Packet
- * @param pktlen number of bytes in 'udp'
- * @param af address family (AFINET or AF_INET6)
- * @param destination_ip destination IP-address of the IP packet (should
- * be our local address)
- * @param source_ip original source IP-address of the IP packet (should
- * be the original destination address)
+ * @param destination_address IP and port to use for the TCP packet's destination
+ * @param source_address IP and port to use for the TCP packet's source
+ * @param tcp_header header template to use
+ * @param payload payload of the TCP packet
+ * @param payload_length number of bytes in @a payload
*/
static void
-udp_from_helper (const struct GNUNET_TUN_UdpHeader *udp,
- size_t pktlen,
- int af,
- const void *destination_ip,
- const void *source_ip)
+send_tcp_packet_via_tun (const struct SocketAddress *destination_address,
+ const struct SocketAddress *source_address,
+ const struct GNUNET_TUN_TcpHeader *tcp_header,
+ const void *payload,
+ size_t payload_length)
{
- struct TunnelState *state;
- struct TunnelMessageQueue *tnq;
- struct GNUNET_EXIT_UdpReplyMessage *urm;
- size_t mlen;
+ size_t len;
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# TCP packets sent via TUN"),
+ 1,
+ GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending packet with %u bytes TCP payload via TUN\n",
+ (unsigned int) payload_length);
+ len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct GNUNET_TUN_Layer2PacketHeader);
+ switch (source_address->af)
{
- char sbuf[INET6_ADDRSTRLEN];
- char dbuf[INET6_ADDRSTRLEN];
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received UDP packet going from %s:%u to %s:%u\n",
- inet_ntop (af,
- source_ip,
- sbuf, sizeof (sbuf)),
- (unsigned int) ntohs (udp->source_port),
- inet_ntop (af,
- destination_ip,
- dbuf, sizeof (dbuf)),
- (unsigned int) ntohs (udp->destination_port));
- }
- if (pktlen < sizeof (struct GNUNET_TUN_UdpHeader))
- {
- /* blame kernel */
+ case AF_INET:
+ len += sizeof (struct GNUNET_TUN_IPv4Header);
+ break;
+ case AF_INET6:
+ len += sizeof (struct GNUNET_TUN_IPv6Header);
+ break;
+ default:
GNUNET_break (0);
return;
}
- if (pktlen != ntohs (udp->len))
+ len += sizeof (struct GNUNET_TUN_TcpHeader);
+ len += payload_length;
+ if (len >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
{
- /* blame kernel */
GNUNET_break (0);
return;
}
- state = get_redirect_state (af, IPPROTO_UDP,
- source_ip,
- ntohs (udp->source_port),
- destination_ip,
- ntohs (udp->destination_port),
- NULL);
- if (NULL == state)
{
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("UDP Packet dropped, have no matching connection information\n"));
- return;
+ char buf[len] GNUNET_ALIGN;
+ struct GNUNET_MessageHeader *hdr;
+ struct GNUNET_TUN_Layer2PacketHeader *tun;
+
+ hdr = (struct GNUNET_MessageHeader *) buf;
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
+ hdr->size = htons (len);
+ tun = (struct GNUNET_TUN_Layer2PacketHeader*) &hdr[1];
+ tun->flags = htons (0);
+ switch (source_address->af)
+ {
+ case AF_INET:
+ {
+ struct GNUNET_TUN_IPv4Header *ipv4
+ = (struct GNUNET_TUN_IPv4Header*) &tun[1];
+
+ tun->proto = htons (ETH_P_IPV4);
+ prepare_ipv4_packet (payload,
+ payload_length,
+ IPPROTO_TCP,
+ tcp_header,
+ source_address,
+ destination_address,
+ ipv4);
+ }
+ break;
+ case AF_INET6:
+ {
+ struct GNUNET_TUN_IPv6Header *ipv6
+ = (struct GNUNET_TUN_IPv6Header*) &tun[1];
+
+ tun->proto = htons (ETH_P_IPV6);
+ prepare_ipv6_packet (payload,
+ payload_length,
+ IPPROTO_TCP,
+ tcp_header,
+ source_address,
+ destination_address,
+ ipv6);
+ }
+ break;
+ default:
+ GNUNET_assert (0);
+ break;
+ }
+ if (NULL != helper_handle)
+ (void) GNUNET_HELPER_send (helper_handle,
+ (const struct GNUNET_MessageHeader*) buf,
+ GNUNET_YES,
+ NULL,
+ NULL);
}
- mlen = sizeof (struct GNUNET_EXIT_UdpReplyMessage) + pktlen - sizeof (struct GNUNET_TUN_UdpHeader);
- tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueue) + mlen);
- tnq->payload = &tnq[1];
- tnq->len = mlen;
- urm = (struct GNUNET_EXIT_UdpReplyMessage *) &tnq[1];
- urm->header.size = htons ((uint16_t) mlen);
- urm->header.type = htons (GNUNET_MESSAGE_TYPE_VPN_UDP_REPLY);
- urm->source_port = htons (0);
- urm->destination_port = htons (0);
- memcpy (&urm[1],
- &udp[1],
- pktlen - sizeof (struct GNUNET_TUN_UdpHeader));
- send_packet_to_mesh_tunnel (state, tnq);
}
/**
- * @brief Handles a TCP packet received from the helper.
+ * Send an ICMP packet via the TUN interface.
*
- * @param tcp A pointer to the Packet
- * @param pktlen the length of the packet, including its TCP header
- * @param af address family (AFINET or AF_INET6)
- * @param destination_ip destination IP-address of the IP packet (should
- * be our local address)
- * @param source_ip original source IP-address of the IP packet (should
- * be the original destination address)
+ * @param destination_address IP to use for the ICMP packet's destination
+ * @param source_address IP to use for the ICMP packet's source
+ * @param icmp_header ICMP header to send
+ * @param payload payload of the ICMP packet (does NOT include ICMP header)
+ * @param payload_length number of bytes of data in @a payload
*/
static void
-tcp_from_helper (const struct GNUNET_TUN_TcpHeader *tcp,
- size_t pktlen,
- int af,
- const void *destination_ip,
- const void *source_ip)
+send_icmp_packet_via_tun (const struct SocketAddress *destination_address,
+ const struct SocketAddress *source_address,
+ const struct GNUNET_TUN_IcmpHeader *icmp_header,
+ const void *payload, size_t payload_length)
{
- struct TunnelState *state;
- char buf[pktlen] GNUNET_ALIGN;
- struct GNUNET_TUN_TcpHeader *mtcp;
- struct GNUNET_EXIT_TcpDataMessage *tdm;
- struct TunnelMessageQueue *tnq;
- size_t mlen;
+ size_t len;
+ struct GNUNET_TUN_IcmpHeader *icmp;
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMP packets sent via TUN"),
+ 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending packet with %u bytes ICMP payload via TUN\n",
+ (unsigned int) payload_length);
+ len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct GNUNET_TUN_Layer2PacketHeader);
+ switch (destination_address->af)
{
- char sbuf[INET6_ADDRSTRLEN];
- char dbuf[INET6_ADDRSTRLEN];
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received TCP packet with %u bytes going from %s:%u to %s:%u\n",
- pktlen - sizeof (struct GNUNET_TUN_TcpHeader),
- inet_ntop (af,
- source_ip,
- sbuf, sizeof (sbuf)),
- (unsigned int) ntohs (tcp->source_port),
- inet_ntop (af,
- destination_ip,
- dbuf, sizeof (dbuf)),
- (unsigned int) ntohs (tcp->destination_port));
- }
- if (pktlen < sizeof (struct GNUNET_TUN_TcpHeader))
- {
- /* blame kernel */
+ case AF_INET:
+ len += sizeof (struct GNUNET_TUN_IPv4Header);
+ break;
+ case AF_INET6:
+ len += sizeof (struct GNUNET_TUN_IPv6Header);
+ break;
+ default:
GNUNET_break (0);
return;
}
- state = get_redirect_state (af, IPPROTO_TCP,
- source_ip,
- ntohs (tcp->source_port),
- destination_ip,
- ntohs (tcp->destination_port),
- NULL);
- if (NULL == state)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("TCP Packet dropped, have no matching connection information\n"));
-
- return;
- }
- /* mug port numbers and crc to avoid information leakage;
- sender will need to lookup the correct values anyway */
- memcpy (buf, tcp, pktlen);
- mtcp = (struct GNUNET_TUN_TcpHeader *) buf;
- mtcp->source_port = 0;
- mtcp->destination_port = 0;
- mtcp->crc = 0;
-
- mlen = sizeof (struct GNUNET_EXIT_TcpDataMessage) + (pktlen - sizeof (struct GNUNET_TUN_TcpHeader));
- if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ len += sizeof (struct GNUNET_TUN_IcmpHeader);
+ len += payload_length;
+ if (len >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
{
GNUNET_break (0);
return;
}
+ {
+ char buf[len] GNUNET_ALIGN;
+ struct GNUNET_MessageHeader *hdr;
+ struct GNUNET_TUN_Layer2PacketHeader *tun;
- tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueue) + mlen);
- tnq->payload = &tnq[1];
- tnq->len = mlen;
- tdm = (struct GNUNET_EXIT_TcpDataMessage *) &tnq[1];
- tdm->header.size = htons ((uint16_t) mlen);
- tdm->header.type = htons (GNUNET_MESSAGE_TYPE_VPN_TCP_DATA_TO_VPN);
- tdm->reserved = htonl (0);
- memcpy (&tdm->tcp_header,
- buf,
- pktlen);
- send_packet_to_mesh_tunnel (state, tnq);
+ hdr= (struct GNUNET_MessageHeader *) buf;
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
+ hdr->size = htons (len);
+ tun = (struct GNUNET_TUN_Layer2PacketHeader*) &hdr[1];
+ tun->flags = htons (0);
+ switch (source_address->af)
+ {
+ case AF_INET:
+ {
+ struct GNUNET_TUN_IPv4Header * ipv4 = (struct GNUNET_TUN_IPv4Header*) &tun[1];
+
+ tun->proto = htons (ETH_P_IPV4);
+ GNUNET_TUN_initialize_ipv4_header (ipv4,
+ IPPROTO_ICMP,
+ sizeof (struct GNUNET_TUN_IcmpHeader) + payload_length,
+ &source_address->address.ipv4,
+ &destination_address->address.ipv4);
+ icmp = (struct GNUNET_TUN_IcmpHeader*) &ipv4[1];
+ }
+ break;
+ case AF_INET6:
+ {
+ struct GNUNET_TUN_IPv6Header * ipv6 = (struct GNUNET_TUN_IPv6Header*) &tun[1];
+
+ tun->proto = htons (ETH_P_IPV6);
+ GNUNET_TUN_initialize_ipv6_header (ipv6,
+ IPPROTO_ICMPV6,
+ sizeof (struct GNUNET_TUN_IcmpHeader) + payload_length,
+ &source_address->address.ipv6,
+ &destination_address->address.ipv6);
+ icmp = (struct GNUNET_TUN_IcmpHeader*) &ipv6[1];
+ }
+ break;
+ default:
+ GNUNET_assert (0);
+ break;
+ }
+ *icmp = *icmp_header;
+ GNUNET_memcpy (&icmp[1],
+ payload,
+ payload_length);
+ GNUNET_TUN_calculate_icmp_checksum (icmp,
+ payload,
+ payload_length);
+ if (NULL != helper_handle)
+ (void) GNUNET_HELPER_send (helper_handle,
+ (const struct GNUNET_MessageHeader*) buf,
+ GNUNET_YES,
+ NULL, NULL);
+ }
}
/**
- * Receive packets from the helper-process
+ * We need to create a (unique) fresh local address (IP+port).
+ * Fill one in.
*
- * @param cls unused
- * @param client unsued
- * @param message message received from helper
+ * @param af desired address family
+ * @param proto desired protocol (IPPROTO_UDP or IPPROTO_TCP)
+ * @param local_address address to initialize
*/
-static int
-message_token (void *cls GNUNET_UNUSED, void *client GNUNET_UNUSED,
- const struct GNUNET_MessageHeader *message)
+static void
+setup_fresh_address (int af,
+ uint8_t proto,
+ struct SocketAddress *local_address)
{
- const struct GNUNET_TUN_Layer2PacketHeader *pkt_tun;
- size_t size;
-
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Got %u-byte message of type %u from gnunet-helper-exit\n",
- ntohs (message->size),
- ntohs (message->type));
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# Packets received from TUN"),
- 1, GNUNET_NO);
- if (ntohs (message->type) != GNUNET_MESSAGE_TYPE_VPN_HELPER)
- {
- GNUNET_break (0);
- return GNUNET_OK;
- }
- size = ntohs (message->size);
- if (size < sizeof (struct GNUNET_TUN_Layer2PacketHeader) + sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_break (0);
- return GNUNET_OK;
- }
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# Bytes received from TUN"),
- size, GNUNET_NO);
- pkt_tun = (const struct GNUNET_TUN_Layer2PacketHeader *) &message[1];
- size -= sizeof (struct GNUNET_TUN_Layer2PacketHeader) + sizeof (struct GNUNET_MessageHeader);
- switch (ntohs (pkt_tun->proto))
+ local_address->af = af;
+ local_address->proto = (uint8_t) proto;
+ /* default "local" port range is often 32768--61000,
+ so we pick a random value in that range */
+ if ( ( (af == AF_INET) && (proto == IPPROTO_ICMP) ) ||
+ ( (af == AF_INET6) && (proto == IPPROTO_ICMPV6) ) )
+ local_address->port = 0;
+ else
+ local_address->port
+ = (uint16_t) 32768 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+ 28232);
+ switch (af)
{
- case ETH_P_IPV4:
+ case AF_INET:
{
- const struct GNUNET_TUN_IPv4Header *pkt4;
+ struct in_addr addr;
+ struct in_addr mask;
+ struct in_addr rnd;
- if (size < sizeof (struct GNUNET_TUN_IPv4Header))
- {
- /* Kernel to blame? */
- GNUNET_break (0);
- return GNUNET_OK;
- }
- pkt4 = (const struct GNUNET_TUN_IPv4Header *) &pkt_tun[1];
- if (size != ntohs (pkt4->total_length))
- {
- /* Kernel to blame? */
- GNUNET_break (0);
- return GNUNET_OK;
- }
- if (pkt4->header_length * 4 != sizeof (struct GNUNET_TUN_IPv4Header))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("IPv4 packet options received. Ignored.\n"));
- return GNUNET_OK;
- }
-
- size -= sizeof (struct GNUNET_TUN_IPv4Header);
- switch (pkt4->protocol)
- {
- case IPPROTO_UDP:
- udp_from_helper ((const struct GNUNET_TUN_UdpHeader *) &pkt4[1], size,
- AF_INET,
- &pkt4->destination_address,
- &pkt4->source_address);
- break;
- case IPPROTO_TCP:
- tcp_from_helper ((const struct GNUNET_TUN_TcpHeader *) &pkt4[1], size,
- AF_INET,
- &pkt4->destination_address,
- &pkt4->source_address);
- break;
- case IPPROTO_ICMP:
- icmp_from_helper ((const struct GNUNET_TUN_IcmpHeader *) &pkt4[1], size,
- AF_INET,
- &pkt4->destination_address,
- &pkt4->source_address);
- break;
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("IPv4 packet with unsupported next header %u received. Ignored.\n"),
- (int) pkt4->protocol);
- return GNUNET_OK;
- }
- }
- break;
- case ETH_P_IPV6:
- {
- const struct GNUNET_TUN_IPv6Header *pkt6;
-
- if (size < sizeof (struct GNUNET_TUN_IPv6Header))
- {
- /* Kernel to blame? */
- GNUNET_break (0);
- return GNUNET_OK;
- }
- pkt6 = (struct GNUNET_TUN_IPv6Header *) &pkt_tun[1];
- if (size != ntohs (pkt6->payload_length) + sizeof (struct GNUNET_TUN_IPv6Header))
- {
- /* Kernel to blame? */
- GNUNET_break (0);
- return GNUNET_OK;
- }
- size -= sizeof (struct GNUNET_TUN_IPv6Header);
- switch (pkt6->next_header)
- {
- case IPPROTO_UDP:
- udp_from_helper ((const struct GNUNET_TUN_UdpHeader *) &pkt6[1], size,
- AF_INET6,
- &pkt6->destination_address,
- &pkt6->source_address);
- break;
- case IPPROTO_TCP:
- tcp_from_helper ((const struct GNUNET_TUN_TcpHeader *) &pkt6[1], size,
- AF_INET6,
- &pkt6->destination_address,
- &pkt6->source_address);
- break;
- case IPPROTO_ICMPV6:
- icmp_from_helper ((const struct GNUNET_TUN_IcmpHeader *) &pkt6[1], size,
- AF_INET6,
- &pkt6->destination_address,
- &pkt6->source_address);
- break;
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("IPv6 packet with unsupported next header %d received. Ignored.\n"),
- pkt6->next_header);
- return GNUNET_OK;
- }
- }
- break;
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Packet from unknown protocol %u received. Ignored.\n"),
- ntohs (pkt_tun->proto));
- break;
- }
- return GNUNET_OK;
-}
-
-
-/**
- * We need to create a (unique) fresh local address (IP+port).
- * Fill one in.
- *
- * @param af desired address family
- * @param proto desired protocol (IPPROTO_UDP or IPPROTO_TCP)
- * @param local_address address to initialize
- */
-static void
-setup_fresh_address (int af,
- uint8_t proto,
- struct SocketAddress *local_address)
-{
- local_address->af = af;
- local_address->proto = (uint8_t) proto;
- /* default "local" port range is often 32768--61000,
- so we pick a random value in that range */
- if ( ( (af == AF_INET) && (proto == IPPROTO_ICMP) ) ||
- ( (af == AF_INET6) && (proto == IPPROTO_ICMPV6) ) )
- local_address->port = 0;
- else
- local_address->port
- = (uint16_t) 32768 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
- 28232);
- switch (af)
- {
- case AF_INET:
- {
- struct in_addr addr;
- struct in_addr mask;
- struct in_addr rnd;
-
- addr = exit_ipv4addr;
- mask = exit_ipv4mask;
- if (0 == ~mask.s_addr)
+ addr = exit_ipv4addr;
+ mask = exit_ipv4mask;
+ if (0 == ~mask.s_addr)
{
/* only one valid IP anyway */
local_address->address.ipv4 = addr;
return;
}
- /* Given 192.168.0.1/255.255.0.0, we want a mask
+ /* Given 192.168.0.1/255.255.0.0, we want a mask
of '192.168.255.255', thus: */
mask.s_addr = addr.s_addr | ~mask.s_addr;
/* Pick random IPv4 address within the subnet, except 'addr' or 'mask' itself */
do
{
- rnd.s_addr = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
- UINT32_MAX);
+ rnd.s_addr = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+ UINT32_MAX);
local_address->address.ipv4.s_addr = (addr.s_addr | rnd.s_addr) & mask.s_addr;
}
while ( (local_address->address.ipv4.s_addr == addr.s_addr) ||
struct in6_addr mask;
struct in6_addr rnd;
int i;
-
+
addr = exit_ipv6addr;
GNUNET_assert (ipv6prefix < 128);
if (ipv6prefix == 127)
mask = addr;
for (i=127;i>=ipv6prefix;i--)
mask.s6_addr[i / 8] |= (1 << (i % 8));
-
+
/* Pick random IPv6 address within the subnet, except 'addr' or 'mask' itself */
do
{
for (i=0;i<16;i++)
{
- rnd.s6_addr[i] = (unsigned char) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+ rnd.s6_addr[i] = (unsigned char) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
256);
local_address->address.ipv6.s6_addr[i]
= (addr.s6_addr[i] | rnd.s6_addr[i]) & mask.s6_addr[i];
break;
default:
GNUNET_assert (0);
- }
+ }
}
* We are starting a fresh connection (TCP or UDP) and need
* to pick a source port and IP address (within the correct
* range and address family) to associate replies with the
- * connection / correct mesh tunnel. This function generates
+ * connection / correct cadet channel. This function generates
* a "fresh" source IP and source port number for a connection
* After picking a good source address, this function sets up
* the state in the 'connections_map' and 'connections_heap'
* @param state skeleton state to setup a record for; should
* 'state->specifics.tcp_udp.ri.remote_address' filled in so that
* this code can determine which AF/protocol is
- * going to be used (the 'tunnel' should also
+ * going to be used (the 'channel' should also
* already be set); after calling this function,
* heap_node and the local_address will be
* also initialized (heap_node != NULL can be
* used to test if a state has been fully setup).
*/
static void
-setup_state_record (struct TunnelState *state)
+setup_state_record (struct ChannelState *state)
{
struct GNUNET_HashCode key;
- struct TunnelState *s;
+ struct ChannelState *s;
/* generate fresh, unique address */
do
setup_fresh_address (state->specifics.tcp_udp.serv->address.af,
state->specifics.tcp_udp.serv->address.proto,
&state->specifics.tcp_udp.ri.local_address);
- } while (NULL != get_redirect_state (state->specifics.tcp_udp.ri.remote_address.af,
- state->specifics.tcp_udp.ri.remote_address.proto,
- &state->specifics.tcp_udp.ri.remote_address.address,
- state->specifics.tcp_udp.ri.remote_address.port,
- &state->specifics.tcp_udp.ri.local_address.address,
- state->specifics.tcp_udp.ri.local_address.port,
- &key));
+ } while (NULL !=
+ get_redirect_state (state->specifics.tcp_udp.ri.remote_address.af,
+ state->specifics.tcp_udp.ri.remote_address.proto,
+ &state->specifics.tcp_udp.ri.remote_address.address,
+ state->specifics.tcp_udp.ri.remote_address.port,
+ &state->specifics.tcp_udp.ri.local_address.address,
+ state->specifics.tcp_udp.ri.local_address.port,
+ &key));
{
char buf[INET6_ADDRSTRLEN];
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Picked local address %s:%u for new connection\n",
- inet_ntop (state->specifics.tcp_udp.ri.local_address.af,
+ inet_ntop (state->specifics.tcp_udp.ri.local_address.af,
&state->specifics.tcp_udp.ri.local_address.address,
- buf, sizeof (buf)),
+ buf,
+ sizeof (buf)),
(unsigned int) state->specifics.tcp_udp.ri.local_address.port);
}
state->specifics.tcp_udp.state_key = key;
GNUNET_assert (GNUNET_OK ==
- GNUNET_CONTAINER_multihashmap_put (connections_map,
+ GNUNET_CONTAINER_multihashmap_put (connections_map,
&key, state,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- state->specifics.tcp_udp.heap_node = GNUNET_CONTAINER_heap_insert (connections_heap,
- state,
- GNUNET_TIME_absolute_get ().abs_value);
+ state->specifics.tcp_udp.heap_node
+ = GNUNET_CONTAINER_heap_insert (connections_heap,
+ state,
+ GNUNET_TIME_absolute_get ().abs_value_us);
while (GNUNET_CONTAINER_heap_get_size (connections_heap) > max_connections)
{
s = GNUNET_CONTAINER_heap_remove_root (connections_heap);
GNUNET_assert (state != s);
s->specifics.tcp_udp.heap_node = NULL;
- GNUNET_MESH_tunnel_destroy (s->tunnel);
+ GNUNET_CADET_channel_destroy (s->channel);
GNUNET_assert (GNUNET_OK ==
GNUNET_CONTAINER_multihashmap_remove (connections_map,
- &s->specifics.tcp_udp.state_key,
+ &s->specifics.tcp_udp.state_key,
s));
GNUNET_free (s);
}
/**
- * Prepare an IPv4 packet for transmission via the TUN interface.
- * Initializes the IP header and calculates checksums (IP+UDP/TCP).
- * For UDP, the UDP header will be fully created, whereas for TCP
- * only the ports and checksum will be filled in. So for TCP,
- * a skeleton TCP header must be part of the provided payload.
+ * Send a UDP packet via the TUN interface.
*
- * @param payload payload of the packet (starting with UDP payload or
- * TCP header, depending on protocol)
- * @param payload_length number of bytes in 'payload'
- * @param protocol IPPROTO_UDP or IPPROTO_TCP
- * @param tcp_header skeleton of the TCP header, NULL for UDP
- * @param src_address source address to use (IP and port)
- * @param dst_address destination address to use (IP and port)
- * @param pkt4 where to write the assembled packet; must
- * contain enough space for the IP header, UDP/TCP header
- * AND the payload
+ * @param destination_address IP and port to use for the UDP packet's destination
+ * @param source_address IP and port to use for the UDP packet's source
+ * @param payload payload of the UDP packet (does NOT include UDP header)
+ * @param payload_length number of bytes of data in @a payload
*/
static void
-prepare_ipv4_packet (const void *payload, size_t payload_length,
- int protocol,
- const struct GNUNET_TUN_TcpHeader *tcp_header,
- const struct SocketAddress *src_address,
- const struct SocketAddress *dst_address,
- struct GNUNET_TUN_IPv4Header *pkt4)
+send_udp_packet_via_tun (const struct SocketAddress *destination_address,
+ const struct SocketAddress *source_address,
+ const void *payload, size_t payload_length)
{
size_t len;
- len = payload_length;
- switch (protocol)
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# UDP packets sent via TUN"),
+ 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending packet with %u bytes UDP payload via TUN\n",
+ (unsigned int) payload_length);
+ len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct GNUNET_TUN_Layer2PacketHeader);
+ switch (source_address->af)
{
- case IPPROTO_UDP:
- len += sizeof (struct GNUNET_TUN_UdpHeader);
+ case AF_INET:
+ len += sizeof (struct GNUNET_TUN_IPv4Header);
break;
- case IPPROTO_TCP:
- len += sizeof (struct GNUNET_TUN_TcpHeader);
- GNUNET_assert (NULL != tcp_header);
+ case AF_INET6:
+ len += sizeof (struct GNUNET_TUN_IPv6Header);
break;
default:
GNUNET_break (0);
return;
}
- if (len + sizeof (struct GNUNET_TUN_IPv4Header) > UINT16_MAX)
+ len += sizeof (struct GNUNET_TUN_UdpHeader);
+ len += payload_length;
+ if (len >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
{
GNUNET_break (0);
return;
}
-
- GNUNET_TUN_initialize_ipv4_header (pkt4,
- protocol,
- len,
- &src_address->address.ipv4,
- &dst_address->address.ipv4);
- switch (protocol)
{
- case IPPROTO_UDP:
- {
- struct GNUNET_TUN_UdpHeader *pkt4_udp = (struct GNUNET_TUN_UdpHeader *) &pkt4[1];
+ char buf[len] GNUNET_ALIGN;
+ struct GNUNET_MessageHeader *hdr;
+ struct GNUNET_TUN_Layer2PacketHeader *tun;
- pkt4_udp->source_port = htons (src_address->port);
- pkt4_udp->destination_port = htons (dst_address->port);
- pkt4_udp->len = htons ((uint16_t) payload_length);
- GNUNET_TUN_calculate_udp4_checksum (pkt4,
- pkt4_udp,
- payload, payload_length);
- memcpy (&pkt4_udp[1], payload, payload_length);
- }
- break;
- case IPPROTO_TCP:
+ hdr= (struct GNUNET_MessageHeader *) buf;
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
+ hdr->size = htons (len);
+ tun = (struct GNUNET_TUN_Layer2PacketHeader*) &hdr[1];
+ tun->flags = htons (0);
+ switch (source_address->af)
{
- struct GNUNET_TUN_TcpHeader *pkt4_tcp = (struct GNUNET_TUN_TcpHeader *) &pkt4[1];
-
- *pkt4_tcp = *tcp_header;
- pkt4_tcp->source_port = htons (src_address->port);
- pkt4_tcp->destination_port = htons (dst_address->port);
- GNUNET_TUN_calculate_tcp4_checksum (pkt4,
- pkt4_tcp,
- payload,
- payload_length);
- memcpy (&pkt4_tcp[1], payload, payload_length);
+ case AF_INET:
+ {
+ struct GNUNET_TUN_IPv4Header * ipv4 = (struct GNUNET_TUN_IPv4Header*) &tun[1];
+
+ tun->proto = htons (ETH_P_IPV4);
+ prepare_ipv4_packet (payload,
+ payload_length,
+ IPPROTO_UDP,
+ NULL,
+ source_address,
+ destination_address,
+ ipv4);
+ }
+ break;
+ case AF_INET6:
+ {
+ struct GNUNET_TUN_IPv6Header * ipv6 = (struct GNUNET_TUN_IPv6Header*) &tun[1];
+
+ tun->proto = htons (ETH_P_IPV6);
+ prepare_ipv6_packet (payload,
+ payload_length,
+ IPPROTO_UDP,
+ NULL,
+ source_address,
+ destination_address,
+ ipv6);
+ }
+ break;
+ default:
+ GNUNET_assert (0);
+ break;
}
- break;
- default:
- GNUNET_assert (0);
+ if (NULL != helper_handle)
+ (void) GNUNET_HELPER_send (helper_handle,
+ (const struct GNUNET_MessageHeader*) buf,
+ GNUNET_YES,
+ NULL, NULL);
}
}
/**
- * Prepare an IPv6 packet for transmission via the TUN interface.
- * Initializes the IP header and calculates checksums (IP+UDP/TCP).
- * For UDP, the UDP header will be fully created, whereas for TCP
- * only the ports and checksum will be filled in. So for TCP,
- * a skeleton TCP header must be part of the provided payload.
+ * Check a request to forward UDP data to the Internet via this peer.
*
- * @param payload payload of the packet (starting with UDP payload or
- * TCP header, depending on protocol)
- * @param payload_length number of bytes in 'payload'
- * @param protocol IPPROTO_UDP or IPPROTO_TCP
- * @param tcp_header skeleton TCP header data to send, NULL for UDP
- * @param src_address source address to use (IP and port)
- * @param dst_address destination address to use (IP and port)
- * @param pkt6 where to write the assembled packet; must
- * contain enough space for the IP header, UDP/TCP header
- * AND the payload
- */
-static void
-prepare_ipv6_packet (const void *payload, size_t payload_length,
- int protocol,
- const struct GNUNET_TUN_TcpHeader *tcp_header,
- const struct SocketAddress *src_address,
- const struct SocketAddress *dst_address,
- struct GNUNET_TUN_IPv6Header *pkt6)
-{
- size_t len;
-
- len = payload_length;
- switch (protocol)
- {
- case IPPROTO_UDP:
- len += sizeof (struct GNUNET_TUN_UdpHeader);
- break;
- case IPPROTO_TCP:
- len += sizeof (struct GNUNET_TUN_TcpHeader);
- break;
- default:
- GNUNET_break (0);
- return;
- }
- if (len > UINT16_MAX)
- {
- GNUNET_break (0);
- return;
- }
-
- GNUNET_TUN_initialize_ipv6_header (pkt6,
- protocol,
- len,
- &src_address->address.ipv6,
- &dst_address->address.ipv6);
-
- switch (protocol)
- {
- case IPPROTO_UDP:
- {
- struct GNUNET_TUN_UdpHeader *pkt6_udp = (struct GNUNET_TUN_UdpHeader *) &pkt6[1];
-
- pkt6_udp->source_port = htons (src_address->port);
- pkt6_udp->destination_port = htons (dst_address->port);
- pkt6_udp->len = htons ((uint16_t) payload_length);
- GNUNET_TUN_calculate_udp6_checksum (pkt6,
- pkt6_udp,
- payload,
- payload_length);
- memcpy (&pkt6_udp[1], payload, payload_length);
- }
- break;
- case IPPROTO_TCP:
- {
- struct GNUNET_TUN_TcpHeader *pkt6_tcp = (struct GNUNET_TUN_TcpHeader *) &pkt6[1];
-
- /* memcpy first here as some TCP header fields are initialized this way! */
- *pkt6_tcp = *tcp_header;
- pkt6_tcp->source_port = htons (src_address->port);
- pkt6_tcp->destination_port = htons (dst_address->port);
- GNUNET_TUN_calculate_tcp6_checksum (pkt6,
- pkt6_tcp,
- payload,
- payload_length);
- memcpy (&pkt6_tcp[1], payload, payload_length);
- }
- break;
- default:
- GNUNET_assert (0);
- break;
- }
-}
-
-
-/**
- * Send a TCP packet via the TUN interface.
- *
- * @param destination_address IP and port to use for the TCP packet's destination
- * @param source_address IP and port to use for the TCP packet's source
- * @param tcp_header header template to use
- * @param payload payload of the TCP packet
- * @param payload_length number of bytes in 'payload'
- */
-static void
-send_tcp_packet_via_tun (const struct SocketAddress *destination_address,
- const struct SocketAddress *source_address,
- const struct GNUNET_TUN_TcpHeader *tcp_header,
- const void *payload, size_t payload_length)
-{
- size_t len;
-
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# TCP packets sent via TUN"),
- 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Sending packet with %u bytes TCP payload via TUN\n",
- (unsigned int) payload_length);
- len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct GNUNET_TUN_Layer2PacketHeader);
- switch (source_address->af)
- {
- case AF_INET:
- len += sizeof (struct GNUNET_TUN_IPv4Header);
- break;
- case AF_INET6:
- len += sizeof (struct GNUNET_TUN_IPv6Header);
- break;
- default:
- GNUNET_break (0);
- return;
- }
- len += sizeof (struct GNUNET_TUN_TcpHeader);
- len += payload_length;
- if (len >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
- {
- GNUNET_break (0);
- return;
- }
- {
- char buf[len] GNUNET_ALIGN;
- struct GNUNET_MessageHeader *hdr;
- struct GNUNET_TUN_Layer2PacketHeader *tun;
-
- hdr = (struct GNUNET_MessageHeader *) buf;
- hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
- hdr->size = htons (len);
- tun = (struct GNUNET_TUN_Layer2PacketHeader*) &hdr[1];
- tun->flags = htons (0);
- switch (source_address->af)
- {
- case AF_INET:
- {
- struct GNUNET_TUN_IPv4Header * ipv4 = (struct GNUNET_TUN_IPv4Header*) &tun[1];
-
- tun->proto = htons (ETH_P_IPV4);
- prepare_ipv4_packet (payload, payload_length,
- IPPROTO_TCP,
- tcp_header,
- source_address,
- destination_address,
- ipv4);
- }
- break;
- case AF_INET6:
- {
- struct GNUNET_TUN_IPv6Header * ipv6 = (struct GNUNET_TUN_IPv6Header*) &tun[1];
-
- tun->proto = htons (ETH_P_IPV6);
- prepare_ipv6_packet (payload, payload_length,
- IPPROTO_TCP,
- tcp_header,
- source_address,
- destination_address,
- ipv6);
- }
- break;
- default:
- GNUNET_assert (0);
- break;
- }
- if (NULL != helper_handle)
- (void) GNUNET_HELPER_send (helper_handle,
- (const struct GNUNET_MessageHeader*) buf,
- GNUNET_YES,
- NULL, NULL);
- }
-}
-
-
-/**
- * Process a request via mesh to send a request to a TCP service
- * offered by this system.
- *
- * @param cls closure, NULL
- * @param tunnel connection to the other end
- * @param tunnel_ctx pointer to our 'struct TunnelState *'
- * @param message the actual message
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
+ * @param cls our `struct ChannelState *`
+ * @param msg the actual message
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
*/
static int
-receive_tcp_service (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
- void **tunnel_ctx GNUNET_UNUSED,
- const struct GNUNET_MessageHeader *message)
+check_udp_remote (void *cls,
+ const struct GNUNET_EXIT_UdpInternetMessage *msg)
{
- struct TunnelState *state = *tunnel_ctx;
- const struct GNUNET_EXIT_TcpServiceStartMessage *start;
- uint16_t pkt_len = ntohs (message->size);
+ struct ChannelState *state = cls;
- if (NULL == state)
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
if (GNUNET_YES == state->is_dns)
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
- if (GNUNET_SYSERR == state->is_dns)
- {
- /* tunnel is UDP/TCP from now on */
- state->is_dns = GNUNET_NO;
- }
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# TCP service creation requests received via mesh"),
- 1, GNUNET_NO);
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# Bytes received from MESH"),
- pkt_len, GNUNET_NO);
- /* check that we got at least a valid header */
- if (pkt_len < sizeof (struct GNUNET_EXIT_TcpServiceStartMessage))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- start = (const struct GNUNET_EXIT_TcpServiceStartMessage*) message;
- pkt_len -= sizeof (struct GNUNET_EXIT_TcpServiceStartMessage);
- if ( (NULL != state->specifics.tcp_udp.serv) ||
- (NULL != state->specifics.tcp_udp.heap_node) )
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (start->tcp_header.off * 4 < sizeof (struct GNUNET_TUN_TcpHeader))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- GNUNET_break_op (ntohl (start->reserved) == 0);
- /* setup fresh connection */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received data from %s for forwarding to TCP service %s on port %u\n",
- GNUNET_i2s (&state->peer),
- GNUNET_h2s (&start->service_descriptor),
- (unsigned int) ntohs (start->tcp_header.destination_port));
- if (NULL == (state->specifics.tcp_udp.serv = find_service (tcp_services, &start->service_descriptor,
- ntohs (start->tcp_header.destination_port))))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("No service found for %s on port %d!\n"),
- "TCP",
- ntohs (start->tcp_header.destination_port));
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# TCP requests dropped (no such service)"),
- 1, GNUNET_NO);
- return GNUNET_SYSERR;
- }
- state->specifics.tcp_udp.ri.remote_address = state->specifics.tcp_udp.serv->address;
- setup_state_record (state);
- send_tcp_packet_via_tun (&state->specifics.tcp_udp.ri.remote_address,
- &state->specifics.tcp_udp.ri.local_address,
- &start->tcp_header,
- &start[1], pkt_len);
- return GNUNET_YES;
+ return GNUNET_OK;
}
/**
- * Process a request to forward TCP data to the Internet via this peer.
+ * Process a request to forward UDP data to the Internet via this peer.
*
- * @param cls closure, NULL
- * @param tunnel connection to the other end
- * @param tunnel_ctx pointer to our 'struct TunnelState *'
- * @param message the actual message
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
+ * @param cls our `struct ChannelState *`
+ * @param msg the actual message
*/
-static int
-receive_tcp_remote (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
- void **tunnel_ctx GNUNET_UNUSED,
- const struct GNUNET_MessageHeader *message)
+static void
+handle_udp_remote (void *cls,
+ const struct GNUNET_EXIT_UdpInternetMessage *msg)
{
- struct TunnelState *state = *tunnel_ctx;
- const struct GNUNET_EXIT_TcpInternetStartMessage *start;
- uint16_t pkt_len = ntohs (message->size);
+ struct ChannelState *state = cls;
+ uint16_t pkt_len = ntohs (msg->header.size) - sizeof (struct GNUNET_EXIT_UdpInternetMessage);
const struct in_addr *v4;
const struct in6_addr *v6;
const void *payload;
int af;
- if (NULL == state)
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (GNUNET_YES == state->is_dns)
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
if (GNUNET_SYSERR == state->is_dns)
{
- /* tunnel is UDP/TCP from now on */
+ /* channel is UDP/TCP from now on */
state->is_dns = GNUNET_NO;
}
GNUNET_STATISTICS_update (stats,
- gettext_noop ("# Bytes received from MESH"),
+ gettext_noop ("# Bytes received from CADET"),
pkt_len, GNUNET_NO);
GNUNET_STATISTICS_update (stats,
- gettext_noop ("# TCP IP-exit creation requests received via mesh"),
+ gettext_noop ("# UDP IP-exit requests received via cadet"),
1, GNUNET_NO);
- if (pkt_len < sizeof (struct GNUNET_EXIT_TcpInternetStartMessage))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- start = (const struct GNUNET_EXIT_TcpInternetStartMessage*) message;
- pkt_len -= sizeof (struct GNUNET_EXIT_TcpInternetStartMessage);
- if ( (NULL != state->specifics.tcp_udp.serv) ||
- (NULL != state->specifics.tcp_udp.heap_node) )
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (start->tcp_header.off * 4 < sizeof (struct GNUNET_TUN_TcpHeader))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- af = (int) ntohl (start->af);
+ af = (int) ntohl (msg->af);
state->specifics.tcp_udp.ri.remote_address.af = af;
switch (af)
{
case AF_INET:
if (pkt_len < sizeof (struct in_addr))
- {
+ {
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
if (! ipv4_exit)
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
- v4 = (const struct in_addr*) &start[1];
+ v4 = (const struct in_addr*) &msg[1];
payload = &v4[1];
pkt_len -= sizeof (struct in_addr);
state->specifics.tcp_udp.ri.remote_address.address.ipv4 = *v4;
if (pkt_len < sizeof (struct in6_addr))
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
if (! ipv6_exit)
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
- v6 = (const struct in6_addr*) &start[1];
+ v6 = (const struct in6_addr*) &msg[1];
payload = &v6[1];
pkt_len -= sizeof (struct in6_addr);
state->specifics.tcp_udp.ri.remote_address.address.ipv6 = *v6;
break;
default:
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
{
char buf[INET6_ADDRSTRLEN];
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received data from %s for starting TCP stream to %s:%u\n",
+ "Received data from %s for forwarding to UDP %s:%u\n",
GNUNET_i2s (&state->peer),
- inet_ntop (af,
+ inet_ntop (af,
&state->specifics.tcp_udp.ri.remote_address.address,
buf, sizeof (buf)),
- (unsigned int) ntohs (start->tcp_header.destination_port));
+ (unsigned int) ntohs (msg->destination_port));
}
- state->specifics.tcp_udp.ri.remote_address.proto = IPPROTO_TCP;
- state->specifics.tcp_udp.ri.remote_address.port = ntohs (start->tcp_header.destination_port);
+ state->specifics.tcp_udp.ri.remote_address.proto = IPPROTO_UDP;
+ state->specifics.tcp_udp.ri.remote_address.port = msg->destination_port;
+ if (NULL == state->specifics.tcp_udp.heap_node)
+ setup_state_record (state);
+ if (0 != ntohs (msg->source_port))
+ state->specifics.tcp_udp.ri.local_address.port = msg->source_port;
+ send_udp_packet_via_tun (&state->specifics.tcp_udp.ri.remote_address,
+ &state->specifics.tcp_udp.ri.local_address,
+ payload,
+ pkt_len);
+ GNUNET_CADET_receive_done (state->channel);
+}
+
+
+/**
+ * Check a request via cadet to send a request to a UDP service
+ * offered by this system.
+ *
+ * @param cls our `struct ChannelState *`
+ * @param msg the actual message
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+check_udp_service (void *cls,
+ const struct GNUNET_EXIT_UdpServiceMessage *msg)
+{
+ struct ChannelState *state = cls;
+
+ if (NULL == state->specifics.tcp_udp.serv)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Process a request via cadet to send a request to a UDP service
+ * offered by this system.
+ *
+ * @param cls our `struct ChannelState *`
+ * @param msg the actual message
+ */
+static void
+handle_udp_service (void *cls,
+ const struct GNUNET_EXIT_UdpServiceMessage *msg)
+{
+ struct ChannelState *state = cls;
+ uint16_t pkt_len = ntohs (msg->header.size) - sizeof (struct GNUNET_EXIT_UdpServiceMessage);
+
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# Bytes received from CADET"),
+ pkt_len, GNUNET_NO);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# UDP service requests received via cadet"),
+ 1, GNUNET_NO);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received data from %s for forwarding to UDP service %s on port %u\n",
+ GNUNET_i2s (&state->peer),
+ GNUNET_h2s (&state->specifics.tcp_udp.serv->descriptor),
+ (unsigned int) ntohs (msg->destination_port));
+ setup_state_record (state);
+ if (0 != ntohs (msg->source_port))
+ state->specifics.tcp_udp.ri.local_address.port = msg->source_port;
+ send_udp_packet_via_tun (&state->specifics.tcp_udp.ri.remote_address,
+ &state->specifics.tcp_udp.ri.local_address,
+ &msg[1],
+ pkt_len);
+ GNUNET_CADET_receive_done (state->channel);
+}
+
+
+/**
+ * Process a request via cadet to send a request to a TCP service
+ * offered by this system.
+ *
+ * @param cls our `struct ChannelState *`
+ * @param start the actual message
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
+ */
+static void
+handle_tcp_service (void *cls,
+ const struct GNUNET_EXIT_TcpServiceStartMessage *start)
+{
+ struct ChannelState *state = cls;
+ uint16_t pkt_len = ntohs (start->header.size) - sizeof (struct GNUNET_EXIT_TcpServiceStartMessage);
+
+ if (GNUNET_SYSERR == state->is_dns)
+ {
+ /* channel is UDP/TCP from now on */
+ state->is_dns = GNUNET_NO;
+ }
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# TCP service creation requests received via cadet"),
+ 1,
+ GNUNET_NO);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# Bytes received from CADET"),
+ pkt_len,
+ GNUNET_NO);
+ GNUNET_break_op (ntohl (start->reserved) == 0);
+ /* setup fresh connection */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received data from %s for forwarding to TCP service %s on port %u\n",
+ GNUNET_i2s (&state->peer),
+ GNUNET_h2s (&state->specifics.tcp_udp.serv->descriptor),
+ (unsigned int) ntohs (start->tcp_header.destination_port));
setup_state_record (state);
send_tcp_packet_via_tun (&state->specifics.tcp_udp.ri.remote_address,
&state->specifics.tcp_udp.ri.local_address,
&start->tcp_header,
- payload, pkt_len);
- return GNUNET_YES;
+ &start[1],
+ pkt_len);
+ GNUNET_CADET_receive_done (state->channel);
}
/**
- * Process a request to forward TCP data on an established
- * connection via this peer.
+ * Check a request to forward TCP data to the Internet via this peer.
*
- * @param cls closure, NULL
- * @param tunnel connection to the other end
- * @param tunnel_ctx pointer to our 'struct TunnelState *'
- * @param message the actual message
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
+ * @param cls our `struct ChannelState *`
+ * @param start the actual message
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
*/
static int
-receive_tcp_data (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
- void **tunnel_ctx GNUNET_UNUSED,
- const struct GNUNET_MessageHeader *message)
+check_tcp_remote (void *cls,
+ const struct GNUNET_EXIT_TcpInternetStartMessage *start)
{
- struct TunnelState *state = *tunnel_ctx;
- const struct GNUNET_EXIT_TcpDataMessage *data;
- uint16_t pkt_len = ntohs (message->size);
+ struct ChannelState *state = cls;
+ if (NULL == state)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
if (GNUNET_YES == state->is_dns)
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
+ if ( (NULL != state->specifics.tcp_udp.serv) ||
+ (NULL != state->specifics.tcp_udp.heap_node) )
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (start->tcp_header.off * 4 < sizeof (struct GNUNET_TUN_TcpHeader))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Process a request to forward TCP data to the Internet via this peer.
+ *
+ * @param cls our `struct ChannelState *`
+ * @param start the actual message
+ */
+static void
+handle_tcp_remote (void *cls,
+ const struct GNUNET_EXIT_TcpInternetStartMessage *start)
+{
+ struct ChannelState *state = cls;
+ uint16_t pkt_len = ntohs (start->header.size) - sizeof (struct GNUNET_EXIT_TcpInternetStartMessage);
+ const struct in_addr *v4;
+ const struct in6_addr *v6;
+ const void *payload;
+ int af;
+
if (GNUNET_SYSERR == state->is_dns)
{
- /* tunnel is UDP/TCP from now on */
+ /* channel is UDP/TCP from now on */
state->is_dns = GNUNET_NO;
}
GNUNET_STATISTICS_update (stats,
- gettext_noop ("# Bytes received from MESH"),
+ gettext_noop ("# Bytes received from CADET"),
pkt_len, GNUNET_NO);
GNUNET_STATISTICS_update (stats,
- gettext_noop ("# TCP data requests received via mesh"),
+ gettext_noop ("# TCP IP-exit creation requests received via cadet"),
1, GNUNET_NO);
- if (pkt_len < sizeof (struct GNUNET_EXIT_TcpDataMessage))
+ af = (int) ntohl (start->af);
+ state->specifics.tcp_udp.ri.remote_address.af = af;
+ switch (af)
{
+ case AF_INET:
+ if (pkt_len < sizeof (struct in_addr))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ if (! ipv4_exit)
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ v4 = (const struct in_addr*) &start[1];
+ payload = &v4[1];
+ pkt_len -= sizeof (struct in_addr);
+ state->specifics.tcp_udp.ri.remote_address.address.ipv4 = *v4;
+ break;
+ case AF_INET6:
+ if (pkt_len < sizeof (struct in6_addr))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ if (! ipv6_exit)
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ v6 = (const struct in6_addr*) &start[1];
+ payload = &v6[1];
+ pkt_len -= sizeof (struct in6_addr);
+ state->specifics.tcp_udp.ri.remote_address.address.ipv6 = *v6;
+ break;
+ default:
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
+ }
+ {
+ char buf[INET6_ADDRSTRLEN];
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received payload from %s for existing TCP stream to %s:%u\n",
+ GNUNET_i2s (&state->peer),
+ inet_ntop (af,
+ &state->specifics.tcp_udp.ri.remote_address.address,
+ buf, sizeof (buf)),
+ (unsigned int) ntohs (start->tcp_header.destination_port));
}
- data = (const struct GNUNET_EXIT_TcpDataMessage*) message;
- pkt_len -= sizeof (struct GNUNET_EXIT_TcpDataMessage);
+ state->specifics.tcp_udp.ri.remote_address.proto = IPPROTO_TCP;
+ state->specifics.tcp_udp.ri.remote_address.port = ntohs (start->tcp_header.destination_port);
+ setup_state_record (state);
+ send_tcp_packet_via_tun (&state->specifics.tcp_udp.ri.remote_address,
+ &state->specifics.tcp_udp.ri.local_address,
+ &start->tcp_header,
+ payload,
+ pkt_len);
+ GNUNET_CADET_receive_done (state->channel);
+}
+
+
+/**
+ * Check a request to forward TCP data on an established
+ * connection via this peer.
+ *
+ * @param cls our `struct ChannelState *`
+ * @param message the actual message
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+check_tcp_data (void *cls,
+ const struct GNUNET_EXIT_TcpDataMessage *data)
+{
+ struct ChannelState *state = cls;
+
if ( (NULL == state) ||
(NULL == state->specifics.tcp_udp.heap_node) )
{
GNUNET_STATISTICS_update (stats,
gettext_noop ("# TCP DATA requests dropped (no session)"),
1, GNUNET_NO);
+ GNUNET_break_op (0);
return GNUNET_SYSERR;
}
if (data->tcp_header.off * 4 < sizeof (struct GNUNET_TUN_TcpHeader))
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
+ if (GNUNET_YES == state->is_dns)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Process a request to forward TCP data on an established
+ * connection via this peer.
+ *
+ * @param cls our `struct ChannelState *`
+ * @param message the actual message
+ */
+static void
+handle_tcp_data (void *cls,
+ const struct GNUNET_EXIT_TcpDataMessage *data)
+{
+ struct ChannelState *state = cls;
+ uint16_t pkt_len = ntohs (data->header.size) - sizeof (struct GNUNET_EXIT_TcpDataMessage);
+
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# Bytes received from CADET"),
+ pkt_len, GNUNET_NO);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# TCP data requests received via cadet"),
+ 1, GNUNET_NO);
+ if (GNUNET_SYSERR == state->is_dns)
+ {
+ /* channel is UDP/TCP from now on */
+ state->is_dns = GNUNET_NO;
+ }
GNUNET_break_op (ntohl (data->reserved) == 0);
{
"Received additional %u bytes of data from %s for TCP stream to %s:%u\n",
pkt_len,
GNUNET_i2s (&state->peer),
- inet_ntop (state->specifics.tcp_udp.ri.remote_address.af,
+ inet_ntop (state->specifics.tcp_udp.ri.remote_address.af,
&state->specifics.tcp_udp.ri.remote_address.address,
buf, sizeof (buf)),
(unsigned int) state->specifics.tcp_udp.ri.remote_address.port);
&state->specifics.tcp_udp.ri.local_address,
&data->tcp_header,
&data[1], pkt_len);
- return GNUNET_YES;
+ GNUNET_CADET_receive_done (state->channel);
}
/**
- * Send an ICMP packet via the TUN interface.
+ * Synthesize a plausible ICMP payload for an ICMPv4 error
+ * response on the given channel.
*
- * @param destination_address IP to use for the ICMP packet's destination
- * @param source_address IP to use for the ICMP packet's source
- * @param icmp_header ICMP header to send
- * @param payload payload of the ICMP packet (does NOT include ICMP header)
- * @param payload_length number of bytes of data in payload
+ * @param state channel information
+ * @param ipp IPv6 header to fill in (ICMP payload)
+ * @param udp "UDP" header to fill in (ICMP payload); might actually
+ * also be the first 8 bytes of the TCP header
*/
static void
-send_icmp_packet_via_tun (const struct SocketAddress *destination_address,
- const struct SocketAddress *source_address,
- const struct GNUNET_TUN_IcmpHeader *icmp_header,
- const void *payload, size_t payload_length)
+make_up_icmpv4_payload (struct ChannelState *state,
+ struct GNUNET_TUN_IPv4Header *ipp,
+ struct GNUNET_TUN_UdpHeader *udp)
{
- size_t len;
- struct GNUNET_TUN_IcmpHeader *icmp;
-
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# ICMP packets sent via TUN"),
- 1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Sending packet with %u bytes ICMP payload via TUN\n",
- (unsigned int) payload_length);
- len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct GNUNET_TUN_Layer2PacketHeader);
- switch (destination_address->af)
- {
- case AF_INET:
- len += sizeof (struct GNUNET_TUN_IPv4Header);
- break;
- case AF_INET6:
- len += sizeof (struct GNUNET_TUN_IPv6Header);
- break;
- default:
- GNUNET_break (0);
- return;
- }
- len += sizeof (struct GNUNET_TUN_IcmpHeader);
- len += payload_length;
- if (len >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
- {
- GNUNET_break (0);
- return;
- }
- {
- char buf[len] GNUNET_ALIGN;
- struct GNUNET_MessageHeader *hdr;
- struct GNUNET_TUN_Layer2PacketHeader *tun;
-
- hdr= (struct GNUNET_MessageHeader *) buf;
- hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
- hdr->size = htons (len);
- tun = (struct GNUNET_TUN_Layer2PacketHeader*) &hdr[1];
- tun->flags = htons (0);
- switch (source_address->af)
- {
- case AF_INET:
- {
- struct GNUNET_TUN_IPv4Header * ipv4 = (struct GNUNET_TUN_IPv4Header*) &tun[1];
-
- tun->proto = htons (ETH_P_IPV4);
- GNUNET_TUN_initialize_ipv4_header (ipv4,
- IPPROTO_ICMP,
- sizeof (struct GNUNET_TUN_IcmpHeader) + payload_length,
- &source_address->address.ipv4,
- &destination_address->address.ipv4);
- icmp = (struct GNUNET_TUN_IcmpHeader*) &ipv4[1];
- }
- break;
- case AF_INET6:
- {
- struct GNUNET_TUN_IPv6Header * ipv6 = (struct GNUNET_TUN_IPv6Header*) &tun[1];
-
- tun->proto = htons (ETH_P_IPV6);
- GNUNET_TUN_initialize_ipv6_header (ipv6,
- IPPROTO_ICMPV6,
- sizeof (struct GNUNET_TUN_IcmpHeader) + payload_length,
- &source_address->address.ipv6,
- &destination_address->address.ipv6);
- icmp = (struct GNUNET_TUN_IcmpHeader*) &ipv6[1];
- }
- break;
- default:
- GNUNET_assert (0);
- break;
- }
- *icmp = *icmp_header;
- memcpy (&icmp[1],
- payload,
- payload_length);
- GNUNET_TUN_calculate_icmp_checksum (icmp,
- payload,
- payload_length);
- if (NULL != helper_handle)
- (void) GNUNET_HELPER_send (helper_handle,
- (const struct GNUNET_MessageHeader*) buf,
- GNUNET_YES,
- NULL, NULL);
- }
-}
+ GNUNET_TUN_initialize_ipv4_header (ipp,
+ state->specifics.tcp_udp.ri.remote_address.proto,
+ sizeof (struct GNUNET_TUN_TcpHeader),
+ &state->specifics.tcp_udp.ri.remote_address.address.ipv4,
+ &state->specifics.tcp_udp.ri.local_address.address.ipv4);
+ udp->source_port = htons (state->specifics.tcp_udp.ri.remote_address.port);
+ udp->destination_port = htons (state->specifics.tcp_udp.ri.local_address.port);
+ udp->len = htons (0);
+ udp->crc = htons (0);
+}
/**
- * Synthesize a plausible ICMP payload for an ICMPv4 error
- * response on the given tunnel.
+ * Synthesize a plausible ICMP payload for an ICMPv6 error
+ * response on the given channel.
*
- * @param state tunnel information
+ * @param state channel information
* @param ipp IPv6 header to fill in (ICMP payload)
* @param udp "UDP" header to fill in (ICMP payload); might actually
* also be the first 8 bytes of the TCP header
*/
static void
-make_up_icmpv4_payload (struct TunnelState *state,
- struct GNUNET_TUN_IPv4Header *ipp,
+make_up_icmpv6_payload (struct ChannelState *state,
+ struct GNUNET_TUN_IPv6Header *ipp,
struct GNUNET_TUN_UdpHeader *udp)
{
- GNUNET_TUN_initialize_ipv4_header (ipp,
+ GNUNET_TUN_initialize_ipv6_header (ipp,
state->specifics.tcp_udp.ri.remote_address.proto,
sizeof (struct GNUNET_TUN_TcpHeader),
- &state->specifics.tcp_udp.ri.remote_address.address.ipv4,
- &state->specifics.tcp_udp.ri.local_address.address.ipv4);
+ &state->specifics.tcp_udp.ri.remote_address.address.ipv6,
+ &state->specifics.tcp_udp.ri.local_address.address.ipv6);
udp->source_port = htons (state->specifics.tcp_udp.ri.remote_address.port);
udp->destination_port = htons (state->specifics.tcp_udp.ri.local_address.port);
udp->len = htons (0);
/**
- * Synthesize a plausible ICMP payload for an ICMPv6 error
- * response on the given tunnel.
+ * Check a request to forward ICMP data to the Internet via this peer.
*
- * @param state tunnel information
- * @param ipp IPv6 header to fill in (ICMP payload)
- * @param udp "UDP" header to fill in (ICMP payload); might actually
- * also be the first 8 bytes of the TCP header
+ * @param cls our `struct ChannelState *`
+ * @param msg the actual message
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
*/
-static void
-make_up_icmpv6_payload (struct TunnelState *state,
- struct GNUNET_TUN_IPv6Header *ipp,
- struct GNUNET_TUN_UdpHeader *udp)
+static int
+check_icmp_remote (void *cls,
+ const struct GNUNET_EXIT_IcmpInternetMessage *msg)
{
- GNUNET_TUN_initialize_ipv6_header (ipp,
- state->specifics.tcp_udp.ri.remote_address.proto,
- sizeof (struct GNUNET_TUN_TcpHeader),
- &state->specifics.tcp_udp.ri.remote_address.address.ipv6,
- &state->specifics.tcp_udp.ri.local_address.address.ipv6);
- udp->source_port = htons (state->specifics.tcp_udp.ri.remote_address.port);
- udp->destination_port = htons (state->specifics.tcp_udp.ri.local_address.port);
- udp->len = htons (0);
- udp->crc = htons (0);
+ struct ChannelState *state = cls;
+
+ if (GNUNET_YES == state->is_dns)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
}
/**
* Process a request to forward ICMP data to the Internet via this peer.
*
- * @param cls closure, NULL
- * @param tunnel connection to the other end
- * @param tunnel_ctx pointer to our 'struct TunnelState *'
- * @param message the actual message
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
+ * @param cls our `struct ChannelState *`
+ * @param msg the actual message
*/
-static int
-receive_icmp_remote (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
- void **tunnel_ctx GNUNET_UNUSED,
- const struct GNUNET_MessageHeader *message)
+static void
+handle_icmp_remote (void *cls,
+ const struct GNUNET_EXIT_IcmpInternetMessage *msg)
{
- struct TunnelState *state = *tunnel_ctx;
- const struct GNUNET_EXIT_IcmpInternetMessage *msg;
- uint16_t pkt_len = ntohs (message->size);
+ struct ChannelState *state = cls;
+ uint16_t pkt_len = ntohs (msg->header.size) - sizeof (struct GNUNET_EXIT_IcmpInternetMessage);
const struct in_addr *v4;
- const struct in6_addr *v6;
+ const struct in6_addr *v6;
const void *payload;
char buf[sizeof (struct GNUNET_TUN_IPv6Header) + 8] GNUNET_ALIGN;
int af;
- if (GNUNET_YES == state->is_dns)
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
if (GNUNET_SYSERR == state->is_dns)
{
- /* tunnel is UDP/TCP from now on */
+ /* channel is UDP/TCP from now on */
state->is_dns = GNUNET_NO;
}
GNUNET_STATISTICS_update (stats,
- gettext_noop ("# Bytes received from MESH"),
+ gettext_noop ("# Bytes received from CADET"),
pkt_len, GNUNET_NO);
GNUNET_STATISTICS_update (stats,
- gettext_noop ("# ICMP IP-exit requests received via mesh"),
+ gettext_noop ("# ICMP IP-exit requests received via cadet"),
1, GNUNET_NO);
- if (pkt_len < sizeof (struct GNUNET_EXIT_IcmpInternetMessage))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- msg = (const struct GNUNET_EXIT_IcmpInternetMessage*) message;
- pkt_len -= sizeof (struct GNUNET_EXIT_IcmpInternetMessage);
af = (int) ntohl (msg->af);
if ( (NULL != state->specifics.tcp_udp.heap_node) &&
(af != state->specifics.tcp_udp.ri.remote_address.af) )
{
- /* other peer switched AF on this tunnel; not allowed */
+ /* other peer switched AF on this channel; not allowed */
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
switch (af)
if (pkt_len < sizeof (struct in_addr))
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
if (! ipv4_exit)
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
v4 = (const struct in_addr*) &msg[1];
payload = &v4[1];
state->specifics.tcp_udp.ri.remote_address.proto = IPPROTO_ICMP;
setup_state_record (state);
}
- /* check that ICMP type is something we want to support
+ /* check that ICMP type is something we want to support
and possibly make up payload! */
switch (msg->icmp_header.type)
{
if (0 != pkt_len)
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
/* make up payload */
{
GNUNET_assert (8 == sizeof (struct GNUNET_TUN_UdpHeader));
pkt_len = sizeof (struct GNUNET_TUN_IPv4Header) + 8;
- make_up_icmpv4_payload (state,
+ make_up_icmpv4_payload (state,
ipp,
udp);
payload = ipp;
GNUNET_STATISTICS_update (stats,
gettext_noop ("# ICMPv4 packets dropped (type not allowed)"),
1, GNUNET_NO);
- return GNUNET_SYSERR;
+ return;
}
/* end AF_INET */
break;
if (pkt_len < sizeof (struct in6_addr))
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
if (! ipv6_exit)
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
v6 = (const struct in6_addr*) &msg[1];
payload = &v6[1];
state->specifics.tcp_udp.ri.remote_address.proto = IPPROTO_ICMPV6;
setup_state_record (state);
}
- /* check that ICMP type is something we want to support
+ /* check that ICMP type is something we want to support
and possibly make up payload! */
switch (msg->icmp_header.type)
{
if (0 != pkt_len)
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
/* make up payload */
{
GNUNET_assert (8 == sizeof (struct GNUNET_TUN_UdpHeader));
pkt_len = sizeof (struct GNUNET_TUN_IPv6Header) + 8;
- make_up_icmpv6_payload (state,
+ make_up_icmpv6_payload (state,
ipp,
udp);
payload = ipp;
GNUNET_STATISTICS_update (stats,
gettext_noop ("# ICMPv6 packets dropped (type not allowed)"),
1, GNUNET_NO);
- return GNUNET_SYSERR;
+ return;
}
/* end AF_INET6 */
- break;
+ break;
default:
/* bad AF */
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
-
+
{
char buf[INET6_ADDRSTRLEN];
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received ICMP data from %s for forwarding to %s\n",
GNUNET_i2s (&state->peer),
- inet_ntop (af,
+ inet_ntop (af,
&state->specifics.tcp_udp.ri.remote_address.address,
buf, sizeof (buf)));
}
&state->specifics.tcp_udp.ri.local_address,
&msg->icmp_header,
payload, pkt_len);
- return GNUNET_YES;
+ GNUNET_CADET_receive_done (state->channel);
}
* @return number of bytes of payload we created in buf
*/
static uint16_t
-make_up_icmp_service_payload (struct TunnelState *state,
+make_up_icmp_service_payload (struct ChannelState *state,
char *buf)
{
switch (state->specifics.tcp_udp.serv->address.af)
{
struct GNUNET_TUN_IPv4Header *ipv4;
struct GNUNET_TUN_UdpHeader *udp;
-
+
ipv4 = (struct GNUNET_TUN_IPv4Header *)buf;
udp = (struct GNUNET_TUN_UdpHeader *) &ipv4[1];
make_up_icmpv4_payload (state,
ipv6,
udp);
GNUNET_assert (8 == sizeof (struct GNUNET_TUN_UdpHeader));
- return sizeof (struct GNUNET_TUN_IPv6Header) + 8;
+ return sizeof (struct GNUNET_TUN_IPv6Header) + 8;
}
break;
default:
/**
- * Process a request via mesh to send ICMP data to a service
+ * Check a request via cadet to send ICMP data to a service
* offered by this system.
*
- * @param cls closure, NULL
- * @param tunnel connection to the other end
- * @param tunnel_ctx pointer to our 'struct TunnelState *'
- * @param message the actual message
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
+ * @param cls our `struct ChannelState *`
+ * @param msg the actual message
+ * @return #GNUNET_OK to keep the connection open,
+ * #GNUNET_SYSERR to close it (signal serious error)
*/
static int
-receive_icmp_service (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
- void **tunnel_ctx,
- const struct GNUNET_MessageHeader *message)
+check_icmp_service (void *cls,
+ const struct GNUNET_EXIT_IcmpServiceMessage *msg)
{
- struct TunnelState *state = *tunnel_ctx;
- const struct GNUNET_EXIT_IcmpServiceMessage *msg;
- uint16_t pkt_len = ntohs (message->size);
- struct GNUNET_TUN_IcmpHeader icmp;
- char buf[sizeof (struct GNUNET_TUN_IPv6Header) + 8] GNUNET_ALIGN;
- const void *payload;
+ struct ChannelState *state = cls;
if (GNUNET_YES == state->is_dns)
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
- if (GNUNET_SYSERR == state->is_dns)
+ if (NULL == state->specifics.tcp_udp.serv)
{
- /* tunnel is UDP/TCP from now on */
- state->is_dns = GNUNET_NO;
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
}
+ return GNUNET_OK;
+}
+
+
+/**
+ * Process a request via cadet to send ICMP data to a service
+ * offered by this system.
+ *
+ * @param cls our `struct ChannelState *`
+ * @param msg the actual message
+ */
+static void
+handle_icmp_service (void *cls,
+ const struct GNUNET_EXIT_IcmpServiceMessage *msg)
+{
+ struct ChannelState *state = cls;
+ uint16_t pkt_len = ntohs (msg->header.size) - sizeof (struct GNUNET_EXIT_IcmpServiceMessage);
+ struct GNUNET_TUN_IcmpHeader icmp;
+ char buf[sizeof (struct GNUNET_TUN_IPv6Header) + 8] GNUNET_ALIGN;
+ const void *payload;
+
GNUNET_STATISTICS_update (stats,
- gettext_noop ("# Bytes received from MESH"),
+ gettext_noop ("# Bytes received from CADET"),
pkt_len, GNUNET_NO);
GNUNET_STATISTICS_update (stats,
- gettext_noop ("# ICMP service requests received via mesh"),
+ gettext_noop ("# ICMP service requests received via cadet"),
1, GNUNET_NO);
/* check that we got at least a valid header */
- if (pkt_len < sizeof (struct GNUNET_EXIT_IcmpServiceMessage))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- msg = (const struct GNUNET_EXIT_IcmpServiceMessage*) message;
- pkt_len -= sizeof (struct GNUNET_EXIT_IcmpServiceMessage);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received data from %s for forwarding to ICMP service %s\n",
GNUNET_i2s (&state->peer),
- GNUNET_h2s (&msg->service_descriptor));
- if (NULL == state->specifics.tcp_udp.serv)
- {
- /* first packet to service must not be ICMP (cannot determine service!) */
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
+ GNUNET_h2s (&state->specifics.tcp_udp.serv->descriptor));
icmp = msg->icmp_header;
payload = &msg[1];
- state->specifics.tcp_udp.ri.remote_address = state->specifics.tcp_udp.serv->address;
+ state->specifics.tcp_udp.ri.remote_address
+ = state->specifics.tcp_udp.serv->address;
setup_state_record (state);
/* check that ICMP type is something we want to support,
if (0 != pkt_len)
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
payload = buf;
pkt_len = make_up_icmp_service_payload (state, buf);
if (0 != pkt_len)
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
payload = buf;
pkt_len = make_up_icmp_service_payload (state, buf);
GNUNET_STATISTICS_update (stats,
gettext_noop ("# ICMPv4 packets dropped (impossible PT to v6)"),
1, GNUNET_NO);
- return GNUNET_OK;
+ return;
}
if (0 != pkt_len)
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
payload = buf;
pkt_len = make_up_icmp_service_payload (state, buf);
GNUNET_STATISTICS_update (stats,
gettext_noop ("# ICMPv4 packets dropped (type not allowed)"),
1, GNUNET_NO);
- return GNUNET_SYSERR;
+ return;
}
/* end of AF_INET */
break;
if (0 != pkt_len)
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
payload = buf;
pkt_len = make_up_icmp_service_payload (state, buf);
if (0 != pkt_len)
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
payload = buf;
pkt_len = make_up_icmp_service_payload (state, buf);
GNUNET_STATISTICS_update (stats,
gettext_noop ("# ICMPv6 packets dropped (impossible PT to v4)"),
1, GNUNET_NO);
- return GNUNET_OK;
+ return;
}
if (0 != pkt_len)
{
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
payload = buf;
pkt_len = make_up_icmp_service_payload (state, buf);
GNUNET_STATISTICS_update (stats,
gettext_noop ("# ICMPv6 packets dropped (type not allowed)"),
1, GNUNET_NO);
- return GNUNET_SYSERR;
+ return;
}
/* end of AF_INET6 */
break;
default:
GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ return;
}
send_icmp_packet_via_tun (&state->specifics.tcp_udp.ri.remote_address,
&state->specifics.tcp_udp.ri.local_address,
&icmp,
- payload, pkt_len);
- return GNUNET_YES;
+ payload,
+ pkt_len);
+ GNUNET_CADET_receive_done (state->channel);
}
/**
- * Send a UDP packet via the TUN interface.
+ * Free memory associated with a service record.
*
- * @param destination_address IP and port to use for the UDP packet's destination
- * @param source_address IP and port to use for the UDP packet's source
- * @param payload payload of the UDP packet (does NOT include UDP header)
- * @param payload_length number of bytes of data in payload
+ * @param cls unused
+ * @param key service descriptor
+ * @param value service record to free
+ * @return #GNUNET_OK
*/
-static void
-send_udp_packet_via_tun (const struct SocketAddress *destination_address,
- const struct SocketAddress *source_address,
- const void *payload, size_t payload_length)
+static int
+free_service_record (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
{
- size_t len;
+ struct LocalService *service = value;
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (services,
+ key,
+ service));
+ GNUNET_CADET_close_port (service->port);
+ GNUNET_free_non_null (service->name);
+ GNUNET_free (service);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Callback from CADET for new channels.
+ *
+ * @param cls closure
+ * @param channel new handle to the channel
+ * @param initiator peer that started the channel
+ * @return initial channel context for the channel
+ */
+static void *
+new_service_channel (void *cls,
+ struct GNUNET_CADET_Channel *channel,
+ const struct GNUNET_PeerIdentity *initiator)
+{
+ struct LocalService *ls = cls;
+ struct ChannelState *s = GNUNET_new (struct ChannelState);
+
+ s->peer = *initiator;
GNUNET_STATISTICS_update (stats,
- gettext_noop ("# UDP packets sent via TUN"),
- 1, GNUNET_NO);
+ gettext_noop ("# Inbound CADET channels created"),
+ 1,
+ GNUNET_NO);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Sending packet with %u bytes UDP payload via TUN\n",
- (unsigned int) payload_length);
- len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct GNUNET_TUN_Layer2PacketHeader);
- switch (source_address->af)
+ "Received inbound channel from `%s'\n",
+ GNUNET_i2s (initiator));
+ s->channel = channel;
+ s->specifics.tcp_udp.serv = ls;
+ s->specifics.tcp_udp.ri.remote_address = ls->address;
+ return s;
+}
+
+
+/**
+ * Function called by cadet whenever an inbound channel is destroyed.
+ * Should clean up any associated state.
+ *
+ * @param cls our `struct ChannelState *`
+ * @param channel connection to the other end (henceforth invalid)
+ */
+static void
+clean_channel (void *cls,
+ const struct GNUNET_CADET_Channel *channel)
+{
+ struct ChannelState *s = cls;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Channel destroyed\n");
+ if (GNUNET_SYSERR == s->is_dns)
{
- case AF_INET:
- len += sizeof (struct GNUNET_TUN_IPv4Header);
- break;
- case AF_INET6:
- len += sizeof (struct GNUNET_TUN_IPv6Header);
- break;
- default:
- GNUNET_break (0);
+ GNUNET_free (s);
return;
}
- len += sizeof (struct GNUNET_TUN_UdpHeader);
- len += payload_length;
- if (len >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ if (GNUNET_YES == s->is_dns)
{
- GNUNET_break (0);
- return;
+ if (channels[s->specifics.dns.my_id] == s)
+ channels[s->specifics.dns.my_id] = NULL;
}
+ else
{
- char buf[len] GNUNET_ALIGN;
- struct GNUNET_MessageHeader *hdr;
- struct GNUNET_TUN_Layer2PacketHeader *tun;
-
- hdr= (struct GNUNET_MessageHeader *) buf;
- hdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
- hdr->size = htons (len);
- tun = (struct GNUNET_TUN_Layer2PacketHeader*) &hdr[1];
- tun->flags = htons (0);
- switch (source_address->af)
+ if (NULL != s->specifics.tcp_udp.heap_node)
{
- case AF_INET:
- {
- struct GNUNET_TUN_IPv4Header * ipv4 = (struct GNUNET_TUN_IPv4Header*) &tun[1];
-
- tun->proto = htons (ETH_P_IPV4);
- prepare_ipv4_packet (payload, payload_length,
- IPPROTO_UDP,
- NULL,
- source_address,
- destination_address,
- ipv4);
- }
- break;
- case AF_INET6:
- {
- struct GNUNET_TUN_IPv6Header * ipv6 = (struct GNUNET_TUN_IPv6Header*) &tun[1];
-
- tun->proto = htons (ETH_P_IPV6);
- prepare_ipv6_packet (payload, payload_length,
- IPPROTO_UDP,
- NULL,
- source_address,
- destination_address,
- ipv6);
- }
- break;
- default:
- GNUNET_assert (0);
- break;
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (connections_map,
+ &s->specifics.tcp_udp.state_key,
+ s));
+ GNUNET_CONTAINER_heap_remove_node (s->specifics.tcp_udp.heap_node);
+ s->specifics.tcp_udp.heap_node = NULL;
}
- if (NULL != helper_handle)
- (void) GNUNET_HELPER_send (helper_handle,
- (const struct GNUNET_MessageHeader*) buf,
- GNUNET_YES,
- NULL, NULL);
}
+ GNUNET_free (s);
}
/**
- * Process a request to forward UDP data to the Internet via this peer.
+ * Given a service descriptor and a destination port, find the
+ * respective service entry.
*
- * @param cls closure, NULL
- * @param tunnel connection to the other end
- * @param tunnel_ctx pointer to our 'struct TunnelState *'
- * @param message the actual message
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
+ * @param proto IPPROTO_TCP or IPPROTO_UDP
+ * @param name name of the service
+ * @param destination_port destination port
+ * @param service service information record to store (service->name will be set).
*/
-static int
-receive_udp_remote (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
- void **tunnel_ctx GNUNET_UNUSED,
- const struct GNUNET_MessageHeader *message)
+static void
+store_service (int proto,
+ const char *name,
+ uint16_t destination_port,
+ struct LocalService *service)
{
- struct TunnelState *state = *tunnel_ctx;
- const struct GNUNET_EXIT_UdpInternetMessage *msg;
- uint16_t pkt_len = ntohs (message->size);
- const struct in_addr *v4;
- const struct in6_addr *v6;
- const void *payload;
- int af;
+ struct GNUNET_MQ_MessageHandler handlers[] = {
+ GNUNET_MQ_hd_var_size (icmp_service,
+ GNUNET_MESSAGE_TYPE_VPN_ICMP_TO_SERVICE,
+ struct GNUNET_EXIT_IcmpServiceMessage,
+ service),
+ GNUNET_MQ_hd_var_size (udp_service,
+ GNUNET_MESSAGE_TYPE_VPN_UDP_TO_SERVICE,
+ struct GNUNET_EXIT_UdpServiceMessage,
+ service),
+ GNUNET_MQ_hd_var_size (tcp_service,
+ GNUNET_MESSAGE_TYPE_VPN_TCP_TO_SERVICE_START,
+ struct GNUNET_EXIT_TcpServiceStartMessage,
+ service),
+ GNUNET_MQ_hd_var_size (tcp_data,
+ GNUNET_MESSAGE_TYPE_VPN_TCP_DATA_TO_EXIT,
+ struct GNUNET_EXIT_TcpDataMessage,
+ service),
+ GNUNET_MQ_handler_end ()
+ };
- if (GNUNET_YES == state->is_dns)
+ struct GNUNET_HashCode cadet_port;
+
+ service->name = GNUNET_strdup (name);
+ GNUNET_TUN_service_name_to_hash (name,
+ &service->descriptor);
+ GNUNET_TUN_compute_service_cadet_port (&service->descriptor,
+ destination_port,
+ &cadet_port);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Opening CADET port %s for SERVICE exit %s on port %u\n",
+ GNUNET_h2s (&cadet_port),
+ name,
+ (unsigned int) destination_port);
+ service->port = GNUNET_CADET_open_porT (cadet_handle,
+ &cadet_port,
+ &new_service_channel,
+ service,
+ NULL,
+ &clean_channel,
+ handlers);
+ service->is_udp = (IPPROTO_UDP == proto);
+ if (GNUNET_OK !=
+ GNUNET_CONTAINER_multihashmap_put (services,
+ &cadet_port,
+ service,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
{
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ GNUNET_CADET_close_port (service->port);
+ GNUNET_free_non_null (service->name);
+ GNUNET_free (service);
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Got duplicate service records for `%s:%u'\n"),
+ name,
+ (unsigned int) destination_port);
}
- if (GNUNET_SYSERR == state->is_dns)
+}
+
+
+/**
+ * Send the given packet via the cadet channel.
+ *
+ * @param s channel destination
+ * @param env message to queue
+ */
+static void
+send_packet_to_cadet_channel (struct ChannelState *s,
+ struct GNUNET_MQ_Envelope *env)
+{
+ GNUNET_assert (NULL != s);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# Messages transmitted via cadet channels"),
+ 1,
+ GNUNET_NO);
+ GNUNET_MQ_send (GNUNET_CADET_get_mq (s->channel),
+ env);
+}
+
+
+/**
+ * @brief Handles an ICMP packet received from the helper.
+ *
+ * @param icmp A pointer to the Packet
+ * @param pktlen number of bytes in @a icmp
+ * @param af address family (AFINET or AF_INET6)
+ * @param destination_ip destination IP-address of the IP packet (should
+ * be our local address)
+ * @param source_ip original source IP-address of the IP packet (should
+ * be the original destination address)
+ */
+static void
+icmp_from_helper (const struct GNUNET_TUN_IcmpHeader *icmp,
+ size_t pktlen,
+ int af,
+ const void *destination_ip,
+ const void *source_ip)
+{
+ struct ChannelState *state;
+ struct GNUNET_MQ_Envelope *env;
+ struct GNUNET_EXIT_IcmpToVPNMessage *i2v;
+ const struct GNUNET_TUN_IPv4Header *ipv4;
+ const struct GNUNET_TUN_IPv6Header *ipv6;
+ const struct GNUNET_TUN_UdpHeader *udp;
+ uint16_t source_port;
+ uint16_t destination_port;
+ uint8_t protocol;
+
{
- /* tunnel is UDP/TCP from now on */
- state->is_dns = GNUNET_NO;
+ char sbuf[INET6_ADDRSTRLEN];
+ char dbuf[INET6_ADDRSTRLEN];
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received ICMP packet going from %s to %s\n",
+ inet_ntop (af,
+ source_ip,
+ sbuf, sizeof (sbuf)),
+ inet_ntop (af,
+ destination_ip,
+ dbuf, sizeof (dbuf)));
}
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# Bytes received from MESH"),
- pkt_len, GNUNET_NO);
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# UDP IP-exit requests received via mesh"),
- 1, GNUNET_NO);
- if (pkt_len < sizeof (struct GNUNET_EXIT_UdpInternetMessage))
+ if (pktlen < sizeof (struct GNUNET_TUN_IcmpHeader))
{
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ /* blame kernel */
+ GNUNET_break (0);
+ return;
}
- msg = (const struct GNUNET_EXIT_UdpInternetMessage*) message;
- pkt_len -= sizeof (struct GNUNET_EXIT_UdpInternetMessage);
- af = (int) ntohl (msg->af);
- state->specifics.tcp_udp.ri.remote_address.af = af;
+
+ /* Find out if this is an ICMP packet in response to an existing
+ TCP/UDP packet and if so, figure out ports / protocol of the
+ existing session from the IP data in the ICMP payload */
+ source_port = 0;
+ destination_port = 0;
switch (af)
{
case AF_INET:
- if (pkt_len < sizeof (struct in_addr))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (! ipv4_exit)
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- v4 = (const struct in_addr*) &msg[1];
- payload = &v4[1];
- pkt_len -= sizeof (struct in_addr);
- state->specifics.tcp_udp.ri.remote_address.address.ipv4 = *v4;
+ protocol = IPPROTO_ICMP;
+ switch (icmp->type)
+ {
+ case GNUNET_TUN_ICMPTYPE_ECHO_REPLY:
+ case GNUNET_TUN_ICMPTYPE_ECHO_REQUEST:
+ break;
+ case GNUNET_TUN_ICMPTYPE_DESTINATION_UNREACHABLE:
+ case GNUNET_TUN_ICMPTYPE_SOURCE_QUENCH:
+ case GNUNET_TUN_ICMPTYPE_TIME_EXCEEDED:
+ if (pktlen <
+ sizeof (struct GNUNET_TUN_IcmpHeader) +
+ sizeof (struct GNUNET_TUN_IPv4Header) + 8)
+ {
+ /* blame kernel */
+ GNUNET_break (0);
+ return;
+ }
+ ipv4 = (const struct GNUNET_TUN_IPv4Header *) &icmp[1];
+ protocol = ipv4->protocol;
+ /* could be TCP or UDP, but both have the ports in the right
+ place, so that doesn't matter here */
+ udp = (const struct GNUNET_TUN_UdpHeader *) &ipv4[1];
+ /* swap ports, as they are from the original message */
+ destination_port = ntohs (udp->source_port);
+ source_port = ntohs (udp->destination_port);
+ /* throw away ICMP payload, won't be useful for the other side anyway */
+ pktlen = sizeof (struct GNUNET_TUN_IcmpHeader);
+ break;
+ default:
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv4 packets dropped (type not allowed)"),
+ 1, GNUNET_NO);
+ return;
+ }
break;
case AF_INET6:
- if (pkt_len < sizeof (struct in6_addr))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (! ipv6_exit)
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- v6 = (const struct in6_addr*) &msg[1];
- payload = &v6[1];
- pkt_len -= sizeof (struct in6_addr);
- state->specifics.tcp_udp.ri.remote_address.address.ipv6 = *v6;
+ protocol = IPPROTO_ICMPV6;
+ switch (icmp->type)
+ {
+ case GNUNET_TUN_ICMPTYPE6_DESTINATION_UNREACHABLE:
+ case GNUNET_TUN_ICMPTYPE6_PACKET_TOO_BIG:
+ case GNUNET_TUN_ICMPTYPE6_TIME_EXCEEDED:
+ case GNUNET_TUN_ICMPTYPE6_PARAMETER_PROBLEM:
+ if (pktlen <
+ sizeof (struct GNUNET_TUN_IcmpHeader) +
+ sizeof (struct GNUNET_TUN_IPv6Header) + 8)
+ {
+ /* blame kernel */
+ GNUNET_break (0);
+ return;
+ }
+ ipv6 = (const struct GNUNET_TUN_IPv6Header *) &icmp[1];
+ protocol = ipv6->next_header;
+ /* could be TCP or UDP, but both have the ports in the right
+ place, so that doesn't matter here */
+ udp = (const struct GNUNET_TUN_UdpHeader *) &ipv6[1];
+ /* swap ports, as they are from the original message */
+ destination_port = ntohs (udp->source_port);
+ source_port = ntohs (udp->destination_port);
+ /* throw away ICMP payload, won't be useful for the other side anyway */
+ pktlen = sizeof (struct GNUNET_TUN_IcmpHeader);
+ break;
+ case GNUNET_TUN_ICMPTYPE6_ECHO_REQUEST:
+ case GNUNET_TUN_ICMPTYPE6_ECHO_REPLY:
+ break;
+ default:
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv6 packets dropped (type not allowed)"),
+ 1, GNUNET_NO);
+ return;
+ }
break;
default:
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ GNUNET_assert (0);
+ }
+ switch (protocol)
+ {
+ case IPPROTO_ICMP:
+ state = get_redirect_state (af,
+ IPPROTO_ICMP,
+ source_ip,
+ 0,
+ destination_ip,
+ 0,
+ NULL);
+ break;
+ case IPPROTO_ICMPV6:
+ state = get_redirect_state (af,
+ IPPROTO_ICMPV6,
+ source_ip,
+ 0,
+ destination_ip,
+ 0,
+ NULL);
+ break;
+ case IPPROTO_UDP:
+ state = get_redirect_state (af,
+ IPPROTO_UDP,
+ source_ip,
+ source_port,
+ destination_ip,
+ destination_port,
+ NULL);
+ break;
+ case IPPROTO_TCP:
+ state = get_redirect_state (af,
+ IPPROTO_TCP,
+ source_ip,
+ source_port,
+ destination_ip,
+ destination_port,
+ NULL);
+ break;
+ default:
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMP packets dropped (not allowed)"),
+ 1,
+ GNUNET_NO);
+ return;
+ }
+ if (NULL == state)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ _("ICMP Packet dropped, have no matching connection information\n"));
+ return;
+ }
+ env = GNUNET_MQ_msg_extra (i2v,
+ pktlen - sizeof (struct GNUNET_TUN_IcmpHeader),
+ GNUNET_MESSAGE_TYPE_VPN_ICMP_TO_VPN);
+ i2v->af = htonl (af);
+ GNUNET_memcpy (&i2v->icmp_header,
+ icmp,
+ pktlen);
+ send_packet_to_cadet_channel (state,
+ env);
+}
+
+
+/**
+ * @brief Handles an UDP packet received from the helper.
+ *
+ * @param udp A pointer to the Packet
+ * @param pktlen number of bytes in 'udp'
+ * @param af address family (AFINET or AF_INET6)
+ * @param destination_ip destination IP-address of the IP packet (should
+ * be our local address)
+ * @param source_ip original source IP-address of the IP packet (should
+ * be the original destination address)
+ */
+static void
+udp_from_helper (const struct GNUNET_TUN_UdpHeader *udp,
+ size_t pktlen,
+ int af,
+ const void *destination_ip,
+ const void *source_ip)
+{
+ struct ChannelState *state;
+ struct GNUNET_MQ_Envelope *env;
+ struct GNUNET_EXIT_UdpReplyMessage *urm;
+
+ {
+ char sbuf[INET6_ADDRSTRLEN];
+ char dbuf[INET6_ADDRSTRLEN];
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received UDP packet going from %s:%u to %s:%u\n",
+ inet_ntop (af,
+ source_ip,
+ sbuf, sizeof (sbuf)),
+ (unsigned int) ntohs (udp->source_port),
+ inet_ntop (af,
+ destination_ip,
+ dbuf, sizeof (dbuf)),
+ (unsigned int) ntohs (udp->destination_port));
+ }
+ if (pktlen < sizeof (struct GNUNET_TUN_UdpHeader))
+ {
+ /* blame kernel */
+ GNUNET_break (0);
+ return;
}
+ if (pktlen != ntohs (udp->len))
{
- char buf[INET6_ADDRSTRLEN];
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received data from %s for forwarding to UDP %s:%u\n",
- GNUNET_i2s (&state->peer),
- inet_ntop (af,
- &state->specifics.tcp_udp.ri.remote_address.address,
- buf, sizeof (buf)),
- (unsigned int) ntohs (msg->destination_port));
+ /* blame kernel */
+ GNUNET_break (0);
+ return;
}
- state->specifics.tcp_udp.ri.remote_address.proto = IPPROTO_UDP;
- state->specifics.tcp_udp.ri.remote_address.port = msg->destination_port;
- if (NULL == state->specifics.tcp_udp.heap_node)
- setup_state_record (state);
- if (0 != ntohs (msg->source_port))
- state->specifics.tcp_udp.ri.local_address.port = msg->source_port;
- send_udp_packet_via_tun (&state->specifics.tcp_udp.ri.remote_address,
- &state->specifics.tcp_udp.ri.local_address,
- payload, pkt_len);
- return GNUNET_YES;
+ state = get_redirect_state (af,
+ IPPROTO_UDP,
+ source_ip,
+ ntohs (udp->source_port),
+ destination_ip,
+ ntohs (udp->destination_port),
+ NULL);
+ if (NULL == state)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ _("UDP Packet dropped, have no matching connection information\n"));
+ return;
+ }
+ env = GNUNET_MQ_msg_extra (urm,
+ pktlen - sizeof (struct GNUNET_TUN_UdpHeader),
+ GNUNET_MESSAGE_TYPE_VPN_UDP_REPLY);
+ urm->source_port = htons (0);
+ urm->destination_port = htons (0);
+ GNUNET_memcpy (&urm[1],
+ &udp[1],
+ pktlen - sizeof (struct GNUNET_TUN_UdpHeader));
+ send_packet_to_cadet_channel (state,
+ env);
}
/**
- * Process a request via mesh to send a request to a UDP service
- * offered by this system.
+ * @brief Handles a TCP packet received from the helper.
*
- * @param cls closure, NULL
- * @param tunnel connection to the other end
- * @param tunnel_ctx pointer to our 'struct TunnelState *'
- * @param message the actual message
- *
- * @return GNUNET_OK to keep the connection open,
- * GNUNET_SYSERR to close it (signal serious error)
+ * @param tcp A pointer to the Packet
+ * @param pktlen the length of the packet, including its TCP header
+ * @param af address family (AFINET or AF_INET6)
+ * @param destination_ip destination IP-address of the IP packet (should
+ * be our local address)
+ * @param source_ip original source IP-address of the IP packet (should
+ * be the original destination address)
*/
-static int
-receive_udp_service (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
- void **tunnel_ctx,
- const struct GNUNET_MessageHeader *message)
+static void
+tcp_from_helper (const struct GNUNET_TUN_TcpHeader *tcp,
+ size_t pktlen,
+ int af,
+ const void *destination_ip,
+ const void *source_ip)
{
- struct TunnelState *state = *tunnel_ctx;
- const struct GNUNET_EXIT_UdpServiceMessage *msg;
- uint16_t pkt_len = ntohs (message->size);
+ struct ChannelState *state;
+ char buf[pktlen] GNUNET_ALIGN;
+ struct GNUNET_TUN_TcpHeader *mtcp;
+ struct GNUNET_EXIT_TcpDataMessage *tdm;
+ struct GNUNET_MQ_Envelope *env;
+ size_t mlen;
- if (GNUNET_YES == state->is_dns)
{
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ char sbuf[INET6_ADDRSTRLEN];
+ char dbuf[INET6_ADDRSTRLEN];
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received TCP packet with %u bytes going from %s:%u to %s:%u\n",
+ (unsigned int) (pktlen - sizeof (struct GNUNET_TUN_TcpHeader)),
+ inet_ntop (af,
+ source_ip,
+ sbuf, sizeof (sbuf)),
+ (unsigned int) ntohs (tcp->source_port),
+ inet_ntop (af,
+ destination_ip,
+ dbuf, sizeof (dbuf)),
+ (unsigned int) ntohs (tcp->destination_port));
}
- if (GNUNET_SYSERR == state->is_dns)
+ if (pktlen < sizeof (struct GNUNET_TUN_TcpHeader))
{
- /* tunnel is UDP/TCP from now on */
- state->is_dns = GNUNET_NO;
+ /* blame kernel */
+ GNUNET_break (0);
+ return;
}
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# Bytes received from MESH"),
- pkt_len, GNUNET_NO);
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# UDP service requests received via mesh"),
- 1, GNUNET_NO);
- /* check that we got at least a valid header */
- if (pkt_len < sizeof (struct GNUNET_EXIT_UdpServiceMessage))
+ state = get_redirect_state (af,
+ IPPROTO_TCP,
+ source_ip,
+ ntohs (tcp->source_port),
+ destination_ip,
+ ntohs (tcp->destination_port),
+ NULL);
+ if (NULL == state)
{
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ _("TCP Packet dropped, have no matching connection information\n"));
+
+ return;
}
- msg = (const struct GNUNET_EXIT_UdpServiceMessage*) message;
- pkt_len -= sizeof (struct GNUNET_EXIT_UdpServiceMessage);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Received data from %s for forwarding to UDP service %s on port %u\n",
- GNUNET_i2s (&state->peer),
- GNUNET_h2s (&msg->service_descriptor),
- (unsigned int) ntohs (msg->destination_port));
- if (NULL == (state->specifics.tcp_udp.serv = find_service (udp_services, &msg->service_descriptor,
- ntohs (msg->destination_port))))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("No service found for %s on port %d!\n"),
- "UDP",
- ntohs (msg->destination_port));
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# UDP requests dropped (no such service)"),
- 1, GNUNET_NO);
- return GNUNET_SYSERR;
+ /* mug port numbers and crc to avoid information leakage;
+ sender will need to lookup the correct values anyway */
+ GNUNET_memcpy (buf, tcp, pktlen);
+ mtcp = (struct GNUNET_TUN_TcpHeader *) buf;
+ mtcp->source_port = 0;
+ mtcp->destination_port = 0;
+ mtcp->crc = 0;
+
+ mlen = sizeof (struct GNUNET_EXIT_TcpDataMessage) + (pktlen - sizeof (struct GNUNET_TUN_TcpHeader));
+ if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
}
- state->specifics.tcp_udp.ri.remote_address = state->specifics.tcp_udp.serv->address;
- setup_state_record (state);
- if (0 != ntohs (msg->source_port))
- state->specifics.tcp_udp.ri.local_address.port = msg->source_port;
- send_udp_packet_via_tun (&state->specifics.tcp_udp.ri.remote_address,
- &state->specifics.tcp_udp.ri.local_address,
- &msg[1], pkt_len);
- return GNUNET_YES;
+ env = GNUNET_MQ_msg_extra (tdm,
+ pktlen - sizeof (struct GNUNET_TUN_TcpHeader),
+ GNUNET_MESSAGE_TYPE_VPN_TCP_DATA_TO_VPN);
+ tdm->reserved = htonl (0);
+ GNUNET_memcpy (&tdm->tcp_header,
+ buf,
+ pktlen);
+ send_packet_to_cadet_channel (state,
+ env);
}
/**
- * Callback from GNUNET_MESH for new tunnels.
+ * Receive packets from the helper-process
*
- * @param cls closure
- * @param tunnel new handle to the tunnel
- * @param initiator peer that started the tunnel
- * @param port destination port
- * @return initial tunnel context for the tunnel
+ * @param cls unused
+ * @param client unsued
+ * @param message message received from helper
*/
-static void *
-new_tunnel (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
- const struct GNUNET_PeerIdentity *initiator, uint32_t port)
+static int
+message_token (void *cls GNUNET_UNUSED,
+ void *client GNUNET_UNUSED,
+ const struct GNUNET_MessageHeader *message)
{
- struct TunnelState *s = GNUNET_malloc (sizeof (struct TunnelState));
+ const struct GNUNET_TUN_Layer2PacketHeader *pkt_tun;
+ size_t size;
- s->is_dns = GNUNET_SYSERR;
- s->peer = *initiator;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Got %u-byte message of type %u from gnunet-helper-exit\n",
+ ntohs (message->size),
+ ntohs (message->type));
GNUNET_STATISTICS_update (stats,
- gettext_noop ("# Inbound MESH tunnels created"),
+ gettext_noop ("# Packets received from TUN"),
1, GNUNET_NO);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received inbound tunnel from `%s'\n",
- GNUNET_i2s (initiator));
- s->tunnel = tunnel;
- return s;
-}
-
-
-/**
- * Function called by mesh whenever an inbound tunnel is destroyed.
- * Should clean up any associated state.
- *
- * @param cls closure (set from GNUNET_MESH_connect)
- * @param tunnel connection to the other end (henceforth invalid)
- * @param tunnel_ctx place where local state associated
- * with the tunnel is stored
- */
-static void
-clean_tunnel (void *cls GNUNET_UNUSED, const struct GNUNET_MESH_Tunnel *tunnel,
- void *tunnel_ctx)
-{
- struct TunnelState *s = tunnel_ctx;
- struct TunnelMessageQueue *tnq;
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Tunnel destroyed\n");
- if (GNUNET_SYSERR == s->is_dns)
+ if (ntohs (message->type) != GNUNET_MESSAGE_TYPE_VPN_HELPER)
{
- GNUNET_free (s);
- return;
+ GNUNET_break (0);
+ return GNUNET_OK;
}
- if (GNUNET_YES == s->is_dns)
+ size = ntohs (message->size);
+ if (size < sizeof (struct GNUNET_TUN_Layer2PacketHeader) + sizeof (struct GNUNET_MessageHeader))
{
- if (tunnels[s->specifics.dns.my_id] == s)
- tunnels[s->specifics.dns.my_id] = NULL;
- GNUNET_free_non_null (s->specifics.dns.reply);
+ GNUNET_break (0);
+ return GNUNET_OK;
}
- else
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# Bytes received from TUN"),
+ size, GNUNET_NO);
+ pkt_tun = (const struct GNUNET_TUN_Layer2PacketHeader *) &message[1];
+ size -= sizeof (struct GNUNET_TUN_Layer2PacketHeader) + sizeof (struct GNUNET_MessageHeader);
+ switch (ntohs (pkt_tun->proto))
{
- while (NULL != (tnq = s->specifics.tcp_udp.head))
+ case ETH_P_IPV4:
{
- GNUNET_CONTAINER_DLL_remove (s->specifics.tcp_udp.head,
- s->specifics.tcp_udp.tail,
- tnq);
- GNUNET_free (tnq);
+ const struct GNUNET_TUN_IPv4Header *pkt4;
+
+ if (size < sizeof (struct GNUNET_TUN_IPv4Header))
+ {
+ /* Kernel to blame? */
+ GNUNET_break (0);
+ return GNUNET_OK;
+ }
+ pkt4 = (const struct GNUNET_TUN_IPv4Header *) &pkt_tun[1];
+ if (size != ntohs (pkt4->total_length))
+ {
+ /* Kernel to blame? */
+ GNUNET_break (0);
+ return GNUNET_OK;
+ }
+ if (pkt4->header_length * 4 != sizeof (struct GNUNET_TUN_IPv4Header))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("IPv4 packet options received. Ignored.\n"));
+ return GNUNET_OK;
+ }
+
+ size -= sizeof (struct GNUNET_TUN_IPv4Header);
+ switch (pkt4->protocol)
+ {
+ case IPPROTO_UDP:
+ udp_from_helper ((const struct GNUNET_TUN_UdpHeader *) &pkt4[1], size,
+ AF_INET,
+ &pkt4->destination_address,
+ &pkt4->source_address);
+ break;
+ case IPPROTO_TCP:
+ tcp_from_helper ((const struct GNUNET_TUN_TcpHeader *) &pkt4[1], size,
+ AF_INET,
+ &pkt4->destination_address,
+ &pkt4->source_address);
+ break;
+ case IPPROTO_ICMP:
+ icmp_from_helper ((const struct GNUNET_TUN_IcmpHeader *) &pkt4[1], size,
+ AF_INET,
+ &pkt4->destination_address,
+ &pkt4->source_address);
+ break;
+ default:
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("IPv4 packet with unsupported next header %u received. Ignored.\n"),
+ (int) pkt4->protocol);
+ return GNUNET_OK;
+ }
}
- if (NULL != s->specifics.tcp_udp.heap_node)
+ break;
+ case ETH_P_IPV6:
{
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove (connections_map,
- &s->specifics.tcp_udp.state_key,
- s));
- GNUNET_CONTAINER_heap_remove_node (s->specifics.tcp_udp.heap_node);
- s->specifics.tcp_udp.heap_node = NULL;
+ const struct GNUNET_TUN_IPv6Header *pkt6;
+
+ if (size < sizeof (struct GNUNET_TUN_IPv6Header))
+ {
+ /* Kernel to blame? */
+ GNUNET_break (0);
+ return GNUNET_OK;
+ }
+ pkt6 = (struct GNUNET_TUN_IPv6Header *) &pkt_tun[1];
+ if (size != ntohs (pkt6->payload_length) + sizeof (struct GNUNET_TUN_IPv6Header))
+ {
+ /* Kernel to blame? */
+ GNUNET_break (0);
+ return GNUNET_OK;
+ }
+ size -= sizeof (struct GNUNET_TUN_IPv6Header);
+ switch (pkt6->next_header)
+ {
+ case IPPROTO_UDP:
+ udp_from_helper ((const struct GNUNET_TUN_UdpHeader *) &pkt6[1], size,
+ AF_INET6,
+ &pkt6->destination_address,
+ &pkt6->source_address);
+ break;
+ case IPPROTO_TCP:
+ tcp_from_helper ((const struct GNUNET_TUN_TcpHeader *) &pkt6[1], size,
+ AF_INET6,
+ &pkt6->destination_address,
+ &pkt6->source_address);
+ break;
+ case IPPROTO_ICMPV6:
+ icmp_from_helper ((const struct GNUNET_TUN_IcmpHeader *) &pkt6[1], size,
+ AF_INET6,
+ &pkt6->destination_address,
+ &pkt6->source_address);
+ break;
+ default:
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("IPv6 packet with unsupported next header %d received. Ignored.\n"),
+ pkt6->next_header);
+ return GNUNET_OK;
+ }
}
+ break;
+ default:
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Packet from unknown protocol %u received. Ignored.\n"),
+ ntohs (pkt_tun->proto));
+ break;
}
- if (NULL != s->th)
- {
- GNUNET_MESH_notify_transmit_ready_cancel (s->th);
- s->th = NULL;
- }
- GNUNET_free (s);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Callback from CADET for new channels.
+ *
+ * @param cls closure
+ * @param channel new handle to the channel
+ * @param initiator peer that started the channel
+ * @return initial channel context for the channel
+ */
+static void *
+new_channel (void *cls,
+ struct GNUNET_CADET_Channel *channel,
+ const struct GNUNET_PeerIdentity *initiator)
+{
+ struct ChannelState *s = GNUNET_new (struct ChannelState);
+
+ s->is_dns = GNUNET_SYSERR;
+ s->peer = *initiator;
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# Inbound CADET channels created"),
+ 1,
+ GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received inbound channel from `%s'\n",
+ GNUNET_i2s (initiator));
+ s->channel = channel;
+ return s;
}
* @param value value to free
*/
static int
-free_iterate (void *cls GNUNET_UNUSED,
- const struct GNUNET_HashCode * hash GNUNET_UNUSED, void *value)
+free_iterate (void *cls,
+ const struct GNUNET_HashCode * hash,
+ void *value)
{
GNUNET_free (value);
return GNUNET_YES;
}
+/**
+ * Function scheduled as very last function if the service
+ * disabled itself because the helper is not installed
+ * properly. Does nothing, except for keeping the
+ * service process alive by virtue of being scheduled.
+ *
+ * @param cls NULL
+ * @param tc scheduler context
+ */
+static void
+dummy_task (void *cls)
+{
+ /* just terminate */
+}
+
+
/**
* Function scheduled as very last function, cleans up after us
+ *
+ * @param cls NULL
*/
static void
-cleanup (void *cls GNUNET_UNUSED,
- const struct GNUNET_SCHEDULER_TaskContext *tskctx)
+cleanup (void *cls)
{
unsigned int i;
GNUNET_REGEX_announce_cancel (regex6);
regex6 = NULL;
}
- if (NULL != mesh_handle)
+ if (NULL != services)
+ {
+ GNUNET_CONTAINER_multihashmap_iterate (services,
+ &free_service_record,
+ NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (services);
+ }
+ if (NULL != dns_port)
+ {
+ GNUNET_CADET_close_port (dns_port);
+ dns_port = NULL;
+ }
+ if (NULL != cadet_port4)
+ {
+ GNUNET_CADET_close_port (cadet_port4);
+ cadet_port4 = NULL;
+ }
+ if (NULL != cadet_port6)
+ {
+ GNUNET_CADET_close_port (cadet_port6);
+ cadet_port6 = NULL;
+ }
+ if (NULL != cadet_handle)
{
- GNUNET_MESH_disconnect (mesh_handle);
- mesh_handle = NULL;
+ GNUNET_CADET_disconnect (cadet_handle);
+ cadet_handle = NULL;
}
if (NULL != connections_map)
{
- GNUNET_CONTAINER_multihashmap_iterate (connections_map, &free_iterate, NULL);
+ GNUNET_CONTAINER_multihashmap_iterate (connections_map,
+ &free_iterate,
+ NULL);
GNUNET_CONTAINER_multihashmap_destroy (connections_map);
connections_map = NULL;
}
GNUNET_CONTAINER_heap_destroy (connections_heap);
connections_heap = NULL;
}
- if (NULL != tcp_services)
+ if (NULL != dnsstub)
{
- GNUNET_CONTAINER_multihashmap_iterate (tcp_services, &free_service_record, NULL);
- GNUNET_CONTAINER_multihashmap_destroy (tcp_services);
- tcp_services = NULL;
+ GNUNET_DNSSTUB_stop (dnsstub);
+ dnsstub = NULL;
}
- if (NULL != udp_services)
+ if (NULL != peer_key)
{
- GNUNET_CONTAINER_multihashmap_iterate (udp_services, &free_service_record, NULL);
- GNUNET_CONTAINER_multihashmap_destroy (udp_services);
- udp_services = NULL;
+ GNUNET_free (peer_key);
+ peer_key = NULL;
}
- if (NULL != dnsstub)
+ if (NULL != dht_task)
{
- GNUNET_DNSSTUB_stop (dnsstub);
- dnsstub = NULL;
+ GNUNET_SCHEDULER_cancel (dht_task);
+ dht_task = NULL;
+ }
+ if (NULL != dht_put)
+ {
+ GNUNET_DHT_put_cancel (dht_put);
+ dht_put = NULL;
+ }
+ if (NULL != dht)
+ {
+ GNUNET_DHT_disconnect (dht);
+ dht = NULL;
}
- if (stats != NULL)
+ if (NULL != stats)
{
- GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
+ GNUNET_STATISTICS_destroy (stats,
+ GNUNET_NO);
stats = NULL;
}
for (i=0;i<8;i++)
char *hostname;
char *hostport;
struct LocalService *serv;
+ char *n;
+ size_t slen;
+
+ slen = strlen (name);
+ GNUNET_assert (slen >= 8);
+ n = GNUNET_strndup (name, slen - 8 /* remove .gnunet. */);
- for (redirect = strtok (cpy, " "); redirect != NULL;
- redirect = strtok (NULL, " "))
+ for (redirect = strtok (cpy, " ;"); redirect != NULL;
+ redirect = strtok (NULL, " ;"))
{
if (NULL == (hostname = strstr (redirect, ":")))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "option `%s' for domain `%s' is not formatted correctly!\n",
+ _("Option `%s' for domain `%s' is not formatted correctly!\n"),
redirect,
name);
continue;
if (NULL == (hostport = strstr (hostname, ":")))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "option `%s' for domain `%s' is not formatted correctly!\n",
- redirect,
- name);
+ _("Option `%s' for domain `%s' is not formatted correctly!\n"),
+ redirect,
+ name);
continue;
}
hostport[0] = '\0';
hostport++;
-
+
int local_port = atoi (redirect);
int remote_port = atoi (hostport);
-
- if (!((local_port > 0) && (local_port < 65536)))
+
+ if (! ((local_port > 0) && (local_port < 65536)))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "`%s' is not a valid port number (for domain `%s')!", redirect,
- name);
+ _("`%s' is not a valid port number (for domain `%s')!"),
+ redirect,
+ name);
continue;
}
- if (!((remote_port > 0) && (remote_port < 65536)))
+ if (! ((remote_port > 0) && (remote_port < 65536)))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "`%s' is not a valid port number (for domain `%s')!", hostport,
+ _("`%s' is not a valid port number (for domain `%s')!"),
+ hostport,
name);
continue;
}
- serv = GNUNET_malloc (sizeof (struct LocalService));
+ serv = GNUNET_new (struct LocalService);
serv->address.proto = proto;
- serv->my_port = (uint16_t) local_port;
serv->address.port = remote_port;
- if (0 == strcmp ("localhost4", hostname))
+ if (0 == strcmp ("localhost4",
+ hostname))
{
const char *ip4addr = exit_argv[5];
- serv->address.af = AF_INET;
- GNUNET_assert (1 == inet_pton (AF_INET, ip4addr, &serv->address.address.ipv4));
+ serv->address.af = AF_INET;
+ GNUNET_assert (1 == inet_pton (AF_INET,
+ ip4addr,
+ &serv->address.address.ipv4));
}
- else if (0 == strcmp ("localhost6", hostname))
+ else if (0 == strcmp ("localhost6",
+ hostname))
{
const char *ip6addr = exit_argv[3];
serv->address.af = AF_INET6;
- GNUNET_assert (1 == inet_pton (AF_INET6, ip6addr, &serv->address.address.ipv6));
+ GNUNET_assert (1 == inet_pton (AF_INET6,
+ ip6addr,
+ &serv->address.address.ipv6));
}
else
{
- struct addrinfo *res;
+ struct addrinfo *res;
int ret;
- ret = getaddrinfo (hostname, NULL, NULL, &res);
- if ( (ret != 0) || (res == NULL) )
+ ret = getaddrinfo (hostname,
+ NULL,
+ NULL,
+ &res);
+ if ( (0 != ret) || (NULL == res) )
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("No addresses found for hostname `%s' of service `%s'!\n"),
hostname,
- name);
+ n);
GNUNET_free (serv);
continue;
}
-
+
serv->address.af = res->ai_family;
switch (res->ai_family)
{
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Service `%s' configured for IPv4, but IPv4 is disabled!\n"),
- name);
+ n);
freeaddrinfo (res);
GNUNET_free (serv);
continue;
}
- serv->address.address.ipv4 = ((struct sockaddr_in *) res->ai_addr)->sin_addr;
+ serv->address.address.ipv4
+ = ((struct sockaddr_in *) res->ai_addr)->sin_addr;
break;
case AF_INET6:
if (! ipv6_enabled)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Service `%s' configured for IPv4, but IPv4 is disabled!\n"),
- name);
+ n);
freeaddrinfo (res);
GNUNET_free (serv);
continue;
- }
- serv->address.address.ipv6 = ((struct sockaddr_in6 *) res->ai_addr)->sin6_addr;
+ }
+ serv->address.address.ipv6
+ = ((struct sockaddr_in6 *) res->ai_addr)->sin6_addr;
break;
default:
freeaddrinfo (res);
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("No IP addresses found for hostname `%s' of service `%s'!\n"),
hostname,
- name);
+ n);
GNUNET_free (serv);
continue;
}
freeaddrinfo (res);
}
- store_service ((IPPROTO_UDP == proto) ? udp_services : tcp_services,
- name,
+ store_service (proto,
+ n,
local_port,
serv);
}
+ GNUNET_free (n);
}
* @param section name of section in config, equal to hostname
*/
static void
-read_service_conf (void *cls GNUNET_UNUSED, const char *section)
+read_service_conf (void *cls,
+ const char *section)
{
char *cpy;
(0 != strcmp (".gnunet.", section + (strlen (section) - 8))))
return;
if (GNUNET_OK ==
- GNUNET_CONFIGURATION_get_value_string (cfg, section, "UDP_REDIRECTS",
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ section,
+ "UDP_REDIRECTS",
&cpy))
{
- add_services (IPPROTO_UDP, cpy, section);
+ add_services (IPPROTO_UDP,
+ cpy,
+ section);
GNUNET_free (cpy);
}
if (GNUNET_OK ==
- GNUNET_CONFIGURATION_get_value_string (cfg, section, "TCP_REDIRECTS",
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ section,
+ "TCP_REDIRECTS",
&cpy))
{
- add_services (IPPROTO_TCP, cpy, section);
+ add_services (IPPROTO_TCP,
+ cpy,
+ section);
GNUNET_free (cpy);
}
}
/**
- * @brief Main function that will be run by the scheduler.
+ * We are running a DNS exit service, advertise it in the
+ * DHT. This task is run periodically to do the DHT PUT.
*
* @param cls closure
- * @param args remaining command-line arguments
- * @param cfgfile name of the configuration file used (for saving, can be NULL!)
- * @param cfg_ configuration
*/
static void
-run (void *cls, char *const *args GNUNET_UNUSED,
- const char *cfgfile GNUNET_UNUSED,
- const struct GNUNET_CONFIGURATION_Handle *cfg_)
+do_dht_put (void *cls);
+
+
+/**
+ * Function called when the DHT PUT operation is complete.
+ * Schedules the next PUT.
+ *
+ * @param cls closure, NULL
+ * @param success #GNUNET_OK if the operation worked (unused)
+ */
+static void
+dht_put_cont (void *cls,
+ int success)
{
- static struct GNUNET_MESH_MessageHandler handlers[] = {
- {&receive_icmp_service, GNUNET_MESSAGE_TYPE_VPN_ICMP_TO_SERVICE, 0},
- {&receive_icmp_remote, GNUNET_MESSAGE_TYPE_VPN_ICMP_TO_INTERNET, 0},
- {&receive_udp_service, GNUNET_MESSAGE_TYPE_VPN_UDP_TO_SERVICE, 0},
- {&receive_udp_remote, GNUNET_MESSAGE_TYPE_VPN_UDP_TO_INTERNET, 0},
- {&receive_tcp_service, GNUNET_MESSAGE_TYPE_VPN_TCP_TO_SERVICE_START, 0},
- {&receive_tcp_remote, GNUNET_MESSAGE_TYPE_VPN_TCP_TO_INTERNET_START, 0},
- {&receive_tcp_data, GNUNET_MESSAGE_TYPE_VPN_TCP_DATA_TO_EXIT, 0},
- {&receive_dns_request, GNUNET_MESSAGE_TYPE_VPN_DNS_TO_INTERNET, 0},
- {NULL, 0, 0}
- };
+ dht_put = NULL;
+ dht_task = GNUNET_SCHEDULER_add_delayed (DHT_PUT_FREQUENCY,
+ &do_dht_put,
+ NULL);
+}
- static uint32_t apptypes[] = {
- GNUNET_APPLICATION_TYPE_END,
- GNUNET_APPLICATION_TYPE_END,
- GNUNET_APPLICATION_TYPE_END,
- GNUNET_APPLICATION_TYPE_END
- };
- unsigned int app_idx;
- char *exit_ifname;
- char *tun_ifname;
- char *ipv6addr;
- char *ipv6prefix_s;
- char *ipv4addr;
- char *ipv4mask;
- char *binary;
- char *regex;
- char *prefixed_regex;
- struct in_addr dns_exit4;
- struct in6_addr dns_exit6;
- char *dns_exit;
- cfg = cfg_;
- ipv4_exit = GNUNET_CONFIGURATION_get_value_yesno (cfg, "exit", "EXIT_IPV4");
- ipv6_exit = GNUNET_CONFIGURATION_get_value_yesno (cfg, "exit", "EXIT_IPV6");
- ipv4_enabled = GNUNET_CONFIGURATION_get_value_yesno (cfg, "exit", "ENABLE_IPV4");
- ipv6_enabled = GNUNET_CONFIGURATION_get_value_yesno (cfg, "exit", "ENABLE_IPV6");
- if ( (ipv4_exit) || (ipv6_exit) )
+/**
+ * We are running a DNS exit service, advertise it in the
+ * DHT. This task is run periodically to do the DHT PUT.
+ *
+ * @param cls closure
+ */
+static void
+do_dht_put (void *cls)
+{
+ struct GNUNET_TIME_Absolute expiration;
+
+ dht_task = NULL;
+ expiration = GNUNET_TIME_absolute_ntoh (dns_advertisement.expiration_time);
+ if (GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us <
+ GNUNET_TIME_UNIT_HOURS.rel_value_us)
{
- binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-exit");
- if (GNUNET_YES !=
- GNUNET_OS_check_helper_binary (binary, GNUNET_YES, "-d gnunet-vpn - - - 169.1.3.3.7 255.255.255.0")) //no nat, ipv4 only
- {
- GNUNET_free (binary);
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("`%s' must be installed SUID, refusing to run\n"),
- "gnunet-helper-exit");
- global_ret = 1;
- return;
- }
- GNUNET_free (binary);
- }
- stats = GNUNET_STATISTICS_create ("exit", cfg);
+ /* refresh advertisement */
+ expiration = GNUNET_TIME_relative_to_absolute (DNS_ADVERTISEMENT_TIMEOUT);
+ dns_advertisement.expiration_time = GNUNET_TIME_absolute_hton (expiration);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CRYPTO_eddsa_sign (peer_key,
+ &dns_advertisement.purpose,
+ &dns_advertisement.signature));
+ }
+ dht_put = GNUNET_DHT_put (dht,
+ &dht_put_key,
+ 1 /* replication */,
+ GNUNET_DHT_RO_NONE,
+ GNUNET_BLOCK_TYPE_DNS,
+ sizeof (struct GNUNET_DNS_Advertisement),
+ &dns_advertisement,
+ expiration,
+ &dht_put_cont,
+ NULL);
+}
+
+/**
+ * Figure out which IP versions we should support (and which
+ * are supported by the OS) according to our configuration.
+ */
+static void
+parse_ip_options ()
+{
+ ipv4_exit = GNUNET_CONFIGURATION_get_value_yesno (cfg,
+ "exit",
+ "EXIT_IPV4");
+ ipv6_exit = GNUNET_CONFIGURATION_get_value_yesno (cfg,
+ "exit",
+ "EXIT_IPV6");
+ ipv4_enabled = GNUNET_CONFIGURATION_get_value_yesno (cfg,
+ "exit",
+ "ENABLE_IPV4");
+ ipv6_enabled = GNUNET_CONFIGURATION_get_value_yesno (cfg,
+ "exit",
+ "ENABLE_IPV6");
if ( (ipv4_exit || ipv4_enabled) &&
GNUNET_OK != GNUNET_NETWORK_test_pf (PF_INET))
{
_("Cannot enable IPv6 exit but disable IPv6 on TUN interface, will use ENABLE_IPv6=YES\n"));
ipv6_enabled = GNUNET_YES;
}
- if (! (ipv4_enabled || ipv6_enabled))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("No useful service enabled. Exiting.\n"));
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
+}
- dns_exit = NULL;
- if ( (GNUNET_YES ==
- GNUNET_CONFIGURATION_get_value_yesno (cfg_, "exit", "ENABLE_DNS")) &&
- ( (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit",
- "DNS_RESOLVER",
- &dns_exit)) ||
- ( (1 != inet_pton (AF_INET, dns_exit, &dns_exit4)) &&
- (1 != inet_pton (AF_INET6, dns_exit, &dns_exit6)) ) ) )
- {
- GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, "dns", "DNS_RESOLVER",
- _("need a valid IPv4 or IPv6 address\n"));
- GNUNET_free_non_null (dns_exit);
- dns_exit = NULL;
- }
- if (NULL != dns_exit)
- dnsstub = GNUNET_DNSSTUB_start (dns_exit);
+/**
+ * Helper function to open the CADET port for DNS exits and to
+ * advertise the DNS exit (if applicable).
+ */
+static void
+advertise_dns_exit ()
+{
+ struct GNUNET_MQ_MessageHandler handlers[] = {
+ GNUNET_MQ_hd_var_size (dns_request,
+ GNUNET_MESSAGE_TYPE_VPN_DNS_TO_INTERNET,
+ struct DnsResponseMessage,
+ NULL),
+ GNUNET_MQ_handler_end ()
+ };
+ char *dns_exit;
+ struct GNUNET_HashCode port;
+ struct in_addr dns_exit4;
+ struct in6_addr dns_exit6;
- app_idx = 0;
- if (GNUNET_YES == ipv4_exit)
- {
- // FIXME use regex to put info
- apptypes[app_idx] = GNUNET_APPLICATION_TYPE_IPV4_GATEWAY;
- app_idx++;
- }
- if (GNUNET_YES == ipv6_exit)
- {
- // FIXME use regex to put info
- apptypes[app_idx] = GNUNET_APPLICATION_TYPE_IPV6_GATEWAY;
- app_idx++;
- }
- if (NULL != dns_exit)
- {
- // FIXME use regex to put info
- apptypes[app_idx] = GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER;
- app_idx++;
+ if (GNUNET_YES !=
+ GNUNET_CONFIGURATION_get_value_yesno (cfg,
+ "exit",
+ "EXIT_DNS"))
+ return;
+ if ( (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ "exit",
+ "DNS_RESOLVER",
+ &dns_exit)) ||
+ ( (1 != inet_pton (AF_INET,
+ dns_exit,
+ &dns_exit4)) &&
+ (1 != inet_pton (AF_INET6,
+ dns_exit,
+ &dns_exit6)) ) )
+ {
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
+ "dns",
+ "DNS_RESOLVER",
+ _("need a valid IPv4 or IPv6 address\n"));
+ GNUNET_free_non_null (dns_exit);
+ return;
}
+ /* open port */
+ GNUNET_CRYPTO_hash (GNUNET_APPLICATION_PORT_INTERNET_RESOLVER,
+ strlen (GNUNET_APPLICATION_PORT_INTERNET_RESOLVER),
+ &port);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Opening CADET port %s for DNS exit service\n",
+ GNUNET_h2s (&port));
+ dns_port = GNUNET_CADET_open_porT (cadet_handle,
+ &port,
+ &new_channel,
+ NULL,
+ NULL,
+ &clean_channel,
+ handlers);
+ /* advertise exit */
+ dht = GNUNET_DHT_connect (cfg,
+ 1);
+ peer_key = GNUNET_CRYPTO_eddsa_key_create_from_configuration (cfg);
+ GNUNET_CRYPTO_eddsa_key_get_public (peer_key,
+ &dns_advertisement.peer.public_key);
+ dns_advertisement.purpose.size = htonl (sizeof (struct GNUNET_DNS_Advertisement) -
+ sizeof (struct GNUNET_CRYPTO_EddsaSignature));
+ dns_advertisement.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_DNS_RECORD);
+ GNUNET_CRYPTO_hash ("dns",
+ strlen ("dns"),
+ &dht_put_key);
+ dht_task = GNUNET_SCHEDULER_add_now (&do_dht_put,
+ NULL);
+ GNUNET_free (dns_exit);
+}
- GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (cfg, "exit", "MAX_CONNECTIONS",
- &max_connections))
- max_connections = 1024;
+/**
+ * Initialize #exit_argv.
+ *
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR if we should shutdown
+ */
+static int
+setup_exit_helper_args ()
+{
+ char *exit_ifname;
+ char *tun_ifname;
+ char *ipv6addr;
+ char *ipv6prefix_s;
+ char *ipv4addr;
+ char *ipv4mask;
+
exit_argv[0] = GNUNET_strdup ("exit-gnunet");
if (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "TUN_IFNAME", &tun_ifname))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No entry 'TUN_IFNAME' in configuration!\n");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ "exit",
+ "TUN_IFNAME",
+ &tun_ifname))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "EXIT",
+ "TUN_IFNAME");
+ return GNUNET_SYSERR;
}
exit_argv[1] = tun_ifname;
if (ipv4_enabled)
{
if (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "EXIT_IFNAME", &exit_ifname))
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ "exit",
+ "EXIT_IFNAME",
+ &exit_ifname))
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No entry 'EXIT_IFNAME' in configuration!\n");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "EXIT",
+ "EXIT_IFNAME");
+ return GNUNET_SYSERR;
}
exit_argv[2] = exit_ifname;
}
{
exit_argv[2] = GNUNET_strdup ("-");
}
-
if (GNUNET_YES == ipv6_enabled)
{
+ ipv6addr = NULL;
if ( (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV6ADDR",
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ "exit",
+ "IPV6ADDR",
&ipv6addr) ||
- (1 != inet_pton (AF_INET6, ipv6addr, &exit_ipv6addr))) )
+ (1 != inet_pton (AF_INET6,
+ ipv6addr,
+ &exit_ipv6addr))) )
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No valid entry 'IPV6ADDR' in configuration!\n");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "EXIT",
+ "IPV6ADDR");
+ GNUNET_free_non_null (ipv6addr);
+ return GNUNET_SYSERR;
}
exit_argv[3] = ipv6addr;
if (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV6PREFIX",
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ "exit",
+ "IPV6PREFIX",
&ipv6prefix_s))
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No entry 'IPV6PREFIX' in configuration!\n");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "EXIT",
+ "IPV6PREFIX");
+ return GNUNET_SYSERR;
}
exit_argv[4] = ipv6prefix_s;
if ( (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (cfg, "exit",
+ GNUNET_CONFIGURATION_get_value_number (cfg,
+ "exit",
"IPV6PREFIX",
&ipv6prefix)) ||
(ipv6prefix >= 127) )
{
- GNUNET_SCHEDULER_shutdown ();
- return;
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
+ "EXIT",
+ "IPV6PREFIX",
+ _("Must be a number"));
+ return GNUNET_SYSERR;
}
- }
+ }
else
{
/* IPv6 explicitly disabled */
}
if (GNUNET_YES == ipv4_enabled)
{
+ ipv4addr = NULL;
if ( (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV4ADDR",
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ "exit",
+ "IPV4ADDR",
&ipv4addr) ||
- (1 != inet_pton (AF_INET, ipv4addr, &exit_ipv4addr))) )
+ (1 != inet_pton (AF_INET,
+ ipv4addr,
+ &exit_ipv4addr))) )
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No valid entry for 'IPV4ADDR' in configuration!\n");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "EXIT",
+ "IPV4ADDR");
+ GNUNET_free_non_null (ipv4addr);
+ return GNUNET_SYSERR;
}
exit_argv[5] = ipv4addr;
+ ipv4mask = NULL;
if ( (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV4MASK",
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ "exit",
+ "IPV4MASK",
&ipv4mask) ||
- (1 != inet_pton (AF_INET, ipv4mask, &exit_ipv4mask))) )
+ (1 != inet_pton (AF_INET,
+ ipv4mask,
+ &exit_ipv4mask))) )
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No valid entry 'IPV4MASK' in configuration!\n");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "EXIT",
+ "IPV4MASK");
+ GNUNET_free_non_null (ipv4mask);
+ return GNUNET_SYSERR;
}
exit_argv[6] = ipv4mask;
}
exit_argv[6] = GNUNET_strdup ("-");
}
exit_argv[7] = NULL;
+ return GNUNET_OK;
+}
- udp_services = GNUNET_CONTAINER_multihashmap_create (65536, GNUNET_NO);
- tcp_services = GNUNET_CONTAINER_multihashmap_create (65536, GNUNET_NO);
- GNUNET_CONFIGURATION_iterate_sections (cfg, &read_service_conf, NULL);
- connections_map = GNUNET_CONTAINER_multihashmap_create (65536, GNUNET_NO);
- connections_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
- mesh_handle
- = GNUNET_MESH_connect (cfg, NULL,
- &new_tunnel,
- &clean_tunnel, handlers,
- apptypes); // FIXME use ports
- if (NULL == mesh_handle)
+/**
+ * @brief Main function that will be run by the scheduler.
+ *
+ * @param cls closure
+ * @param args remaining command-line arguments
+ * @param cfgfile name of the configuration file used (for saving, can be NULL!)
+ * @param cfg_ configuration
+ */
+static void
+run (void *cls,
+ char *const *args,
+ const char *cfgfile,
+ const struct GNUNET_CONFIGURATION_Handle *cfg_)
+{
+ struct GNUNET_MQ_MessageHandler handlers[] = {
+ GNUNET_MQ_hd_var_size (icmp_remote,
+ GNUNET_MESSAGE_TYPE_VPN_ICMP_TO_INTERNET,
+ struct GNUNET_EXIT_IcmpInternetMessage,
+ NULL),
+ GNUNET_MQ_hd_var_size (udp_remote,
+ GNUNET_MESSAGE_TYPE_VPN_UDP_TO_INTERNET,
+ struct GNUNET_EXIT_UdpInternetMessage,
+ NULL),
+ GNUNET_MQ_hd_var_size (tcp_remote,
+ GNUNET_MESSAGE_TYPE_VPN_TCP_TO_INTERNET_START,
+ struct GNUNET_EXIT_TcpInternetStartMessage,
+ NULL),
+ GNUNET_MQ_hd_var_size (tcp_data,
+ GNUNET_MESSAGE_TYPE_VPN_TCP_DATA_TO_EXIT,
+ struct GNUNET_EXIT_TcpDataMessage,
+ NULL),
+ GNUNET_MQ_handler_end ()
+ };
+ struct GNUNET_HashCode port;
+ char *policy;
+ char *binary;
+ char *regex;
+ char *prefixed_regex;
+
+ cfg = cfg_;
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (cfg,
+ "exit",
+ "MAX_CONNECTIONS",
+ &max_connections))
+ max_connections = 1024;
+ parse_ip_options ();
+ if ( (ipv4_exit) || (ipv6_exit) )
+ {
+ binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-exit");
+ if (GNUNET_YES !=
+ GNUNET_OS_check_helper_binary (binary,
+ GNUNET_YES,
+ "-d gnunet-vpn - - - 169.1.3.3.7 255.255.255.0")) //no nat, ipv4 only
+ {
+ GNUNET_free (binary);
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("`%s' must be installed SUID, EXIT will not work\n"),
+ "gnunet-helper-exit");
+ GNUNET_SCHEDULER_add_shutdown (&dummy_task,
+ NULL);
+ global_ret = 1;
+ return;
+ }
+ GNUNET_free (binary);
+ }
+ if (! (ipv4_enabled || ipv6_enabled))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("No useful service enabled. Exiting.\n"));
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+
+ GNUNET_SCHEDULER_add_shutdown (&cleanup,
+ NULL);
+ stats = GNUNET_STATISTICS_create ("exit",
+ cfg);
+ cadet_handle = GNUNET_CADET_connecT (cfg);
+ if (NULL == cadet_handle)
+ {
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ advertise_dns_exit ();
+ if (GNUNET_OK !=
+ setup_exit_helper_args ())
{
GNUNET_SCHEDULER_shutdown ();
return;
}
- /* Mesh handle acquired, now announce regular expressions matching our exit */
+ services = GNUNET_CONTAINER_multihashmap_create (65536,
+ GNUNET_NO);
+ connections_map = GNUNET_CONTAINER_multihashmap_create (65536,
+ GNUNET_NO);
+ connections_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
+ GNUNET_CONFIGURATION_iterate_sections (cfg,
+ &read_service_conf,
+ NULL);
+
+ /* Cadet handle acquired, now open ports and announce regular
+ expressions matching our exit */
if ( (GNUNET_YES == ipv4_enabled) && (GNUNET_YES == ipv4_exit) )
{
+ GNUNET_CRYPTO_hash (GNUNET_APPLICATION_PORT_IPV4_GATEWAY,
+ strlen (GNUNET_APPLICATION_PORT_IPV4_GATEWAY),
+ &port);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Opening CADET port %s for IPv4 gateway service\n",
+ GNUNET_h2s (&port));
+ cadet_port4 = GNUNET_CADET_open_porT (cadet_handle,
+ &port,
+ &new_channel,
+ NULL,
+ NULL,
+ &clean_channel,
+ handlers);
+ policy = NULL;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg,
"exit",
- "EXIT_RANGE_IPV4_REGEX",
- ®ex))
- regex = GNUNET_strdup ("(0|1)*");
- (void) GNUNET_asprintf (&prefixed_regex, "%s%s%s",
- GNUNET_APPLICATION_TYPE_EXIT_REGEX_PREFIX,
- "4", regex);
- regex4 = GNUNET_REGEX_announce (cfg,
- prefixed_regex,
- REGEX_REFRESH_FREQUENCY,
- REGEX_MAX_PATH_LEN_IPV4);
- GNUNET_free (regex);
- GNUNET_free (prefixed_regex);
- }
-
- if (GNUNET_YES == ipv6_enabled && GNUNET_YES == ipv6_exit)
+ "EXIT_RANGE_IPV4_POLICY",
+ &policy))
+ regex = NULL;
+ else
+ regex = GNUNET_TUN_ipv4policy2regex (policy);
+ GNUNET_free_non_null (policy);
+ if (NULL != regex)
+ {
+ (void) GNUNET_asprintf (&prefixed_regex,
+ "%s%s",
+ GNUNET_APPLICATION_TYPE_EXIT_REGEX_PREFIX,
+ regex);
+ regex4 = GNUNET_REGEX_announce (cfg,
+ prefixed_regex,
+ REGEX_REFRESH_FREQUENCY,
+ REGEX_MAX_PATH_LEN_IPV4);
+ GNUNET_free (regex);
+ GNUNET_free (prefixed_regex);
+ }
+ }
+
+ if ( (GNUNET_YES == ipv6_enabled) && (GNUNET_YES == ipv6_exit) )
{
+ GNUNET_CRYPTO_hash (GNUNET_APPLICATION_PORT_IPV6_GATEWAY,
+ strlen (GNUNET_APPLICATION_PORT_IPV6_GATEWAY),
+ &port);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Opening CADET port %s for IPv6 gateway service\n",
+ GNUNET_h2s (&port));
+ cadet_port6 = GNUNET_CADET_open_porT (cadet_handle,
+ &port,
+ &new_channel,
+ NULL,
+ NULL,
+ &clean_channel,
+ handlers);
+ policy = NULL;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg,
"exit",
- "EXIT_RANGE_IPV6_REGEX",
- ®ex))
- regex = GNUNET_strdup ("(0|1)*");
- (void) GNUNET_asprintf (&prefixed_regex, "%s%s%s",
- GNUNET_APPLICATION_TYPE_EXIT_REGEX_PREFIX,
- "6", regex);
- regex6 = GNUNET_REGEX_announce (cfg,
- prefixed_regex,
- REGEX_REFRESH_FREQUENCY,
- REGEX_MAX_PATH_LEN_IPV6);
- GNUNET_free (regex);
- GNUNET_free (prefixed_regex);
+ "EXIT_RANGE_IPV6_POLICY",
+ &policy))
+ regex = NULL;
+ else
+ regex = GNUNET_TUN_ipv6policy2regex (policy);
+ GNUNET_free_non_null (policy);
+ if (NULL != regex)
+ {
+ (void) GNUNET_asprintf (&prefixed_regex,
+ "%s%s",
+ GNUNET_APPLICATION_TYPE_EXIT_REGEX_PREFIX,
+ regex);
+ regex6 = GNUNET_REGEX_announce (cfg,
+ prefixed_regex,
+ REGEX_REFRESH_FREQUENCY,
+ REGEX_MAX_PATH_LEN_IPV6);
+ GNUNET_free (regex);
+ GNUNET_free (prefixed_regex);
+ }
}
if ((ipv4_exit) || (ipv6_exit))
helper_handle = GNUNET_HELPER_start (GNUNET_NO,
- "gnunet-helper-exit",
+ "gnunet-helper-exit",
exit_argv,
&message_token,
NULL, NULL);
* @return 0 ok, 1 on error
*/
int
-main (int argc, char *const *argv)
+main (int argc,
+ char *const *argv)
{
static const struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_OPTION_END
};
- if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
+ if (GNUNET_OK !=
+ GNUNET_STRINGS_get_utf8_args (argc,
+ argv,
+ &argc,
+ &argv))
return 2;
return (GNUNET_OK ==
- GNUNET_PROGRAM_run (argc, argv, "gnunet-daemon-exit",
- gettext_noop
- ("Daemon to run to provide an IP exit node for the VPN"),
- options, &run, NULL)) ? global_ret : 1;
+ GNUNET_PROGRAM_run (argc,
+ argv,
+ "gnunet-daemon-exit",
+ gettext_noop ("Daemon to run to provide an IP exit node for the VPN"),
+ options,
+ &run,
+ NULL)) ? global_ret : 1;
}
projects / oweals / gnunet.git / blobdiff