/*
This file is part of GNUnet.
- (C) 2010, 2012 Christian Grothoff
+ (C) 2010-2013 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
* - 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_dht_service.h"
#include "gnunet_mesh_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
+ * based regex.
+ */
+#define REGEX_MAX_PATH_LEN_IPV4 4
+
+/**
+ * Maximum path compression length for mesh regex announcing for IPv6 address
+ * based regex.
+ */
+#define REGEX_MAX_PATH_LEN_IPV6 8
+
+/**
+ * How frequently do we re-announce the regex for the exit?
+ */
+#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
+ */
+#define LOG(kind, ...) \
+ GNUNET_log_from (kind, "exit", __VA_ARGS__);
+
/**
* Information about an address.
*/
struct in6_addr ipv6;
} address;
-
+
/**
* IPPROTO_TCP or IPPROTO_UDP;
*/
* 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
struct GNUNET_MESH_Tunnel *tunnel;
/**
- * Heap node for this state in the connections_heap.
+ * Who is the other end of this tunnel.
+ * FIXME is this needed? Only used for debugging messages
*/
- struct GNUNET_CONTAINER_HeapNode *heap_node;
+ struct GNUNET_PeerIdentity peer;
/**
- * Key this state has in the connections_map.
+ * Active tunnel transmission request (or NULL).
*/
- GNUNET_HashCode state_key;
+ struct GNUNET_MESH_TransmitHandle *th;
/**
- * Associated service record, or NULL for no service.
+ * #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.
*/
- struct LocalService *serv;
+ int is_dns;
- /**
- * Head of DLL of messages for this tunnel.
- */
- struct TunnelMessageQueue *head;
+ union
+ {
+ struct
+ {
- /**
- * Tail of DLL of messages for this tunnel.
- */
- struct TunnelMessageQueue *tail;
+ /**
+ * Heap node for this state in the connections_heap.
+ */
+ struct GNUNET_CONTAINER_HeapNode *heap_node;
+
+ /**
+ * 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 RedirectInformation ri;
+ } tcp_udp;
+
+ struct
+ {
- /**
- * Active tunnel transmission request (or NULL).
- */
- struct GNUNET_MESH_TransmitHandle *th;
+ /**
+ * DNS reply ready for transmission.
+ */
+ char *reply;
- /**
- * Primary redirection information for this connection.
- */
- struct RedirectInformation ri;
+ /**
+ * 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;
};
+/**
+ * Return value from 'main'.
+ */
+static int global_ret;
+
+/**
+ * Handle to our regex announcement for IPv4.
+ */
+static struct GNUNET_REGEX_Announcement *regex4;
+
+/**
+ * Handle to our regex announcement for IPv4.
+ */
+static struct GNUNET_REGEX_Announcement *regex6;
+
/**
* The handle to the configuration used throughout the process
*/
/**
* Arguments to the exit helper.
*/
-static char *exit_argv[7];
+static char *exit_argv[8];
/**
* IPv6 address of our TUN interface.
*/
static struct in_addr exit_ipv4mask;
-
/**
* Statistics.
*/
/**
* If there are at least this many connections, old ones will be removed
*/
-static long long unsigned int max_connections;
+static unsigned long long max_connections;
/**
* This hashmaps saves interesting things about the configured UDP services
*/
static struct GNUNET_CONTAINER_MultiHashMap *tcp_services;
+/**
+ * Array of all open DNS requests from tunnels.
+ */
+static struct TunnelState *tunnels[UINT16_MAX + 1];
+
+/**
+ * Handle to the DNS Stub resolver.
+ */
+static struct GNUNET_DNSSTUB_Context *dnsstub;
+
+/**
+ * Handle for ongoing DHT PUT operations to advertise exit service.
+ */
+static struct GNUNET_DHT_PutHandle *dht_put;
+
+/**
+ * Handle to the DHT.
+ */
+static struct GNUNET_DHT_Handle *dht;
+
+/**
+ * Task for doing DHT PUTs to advertise exit service.
+ */
+static GNUNET_SCHEDULER_TaskIdentifier 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_EccPrivateKey *peer_key;
+
/**
* Are we an IPv4-exit?
*/
static int ipv6_enabled;
+/**
+ * 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)
+{
+ struct TunnelState *ts = cls;
+ size_t off;
+ size_t ret;
+ char *cbuf = buf;
+ struct GNUNET_MessageHeader hdr;
+ 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;
+}
+
+
+/**
+ * Callback called from DNSSTUB resolver when a resolution
+ * succeeded.
+ *
+ * @param cls NULL
+ * @param rs the socket that received the response
+ * @param dns the response itself
+ * @param r number of bytes in dns
+ */
+static void
+process_dns_result (void *cls,
+ struct GNUNET_DNSSTUB_RequestSocket *rs,
+ const struct GNUNET_TUN_DnsHeader *dns,
+ size_t r)
+{
+ struct TunnelState *ts;
+
+ 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];
+ 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);
+}
+
+
+/**
+ * Process a request via mesh 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)
+ */
+static int
+receive_dns_request (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
+ void **tunnel_ctx,
+ const struct GNUNET_MessageHeader *message)
+{
+ 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;
+
+ if (NULL == dnsstub)
+ return GNUNET_SYSERR;
+ if (GNUNET_NO == ts->is_dns)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_SYSERR == ts->is_dns)
+ {
+ /* tunnel 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);
+ dout = (struct GNUNET_TUN_DnsHeader *) buf;
+ dout->id = ts->specifics.dns.my_id;
+ ts->specifics.dns.rs = GNUNET_DNSSTUB_resolve2 (dnsstub,
+ buf, dlen,
+ &process_dns_result,
+ NULL);
+ if (NULL == ts->specifics.dns.rs)
+ return GNUNET_SYSERR;
+ return GNUNET_OK;
+}
+
+
/**
* Given IP information about a connection, calculate the respective
* hash we would use for the 'connections_map'.
* @param ri information about the connection
*/
static void
-hash_redirect_info (GNUNET_HashCode *hash,
+hash_redirect_info (struct GNUNET_HashCode *hash,
const struct RedirectInformation *ri)
{
char *off;
- memset (hash, 0, sizeof (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;
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);
+ /* off += sizeof (uint8_t); */
}
*/
static struct TunnelState *
get_redirect_state (int af,
- int protocol,
+ int protocol,
const void *destination_ip,
uint16_t destination_port,
const void *local_ip,
uint16_t local_port,
- GNUNET_HashCode *state_key)
+ struct GNUNET_HashCode *state_key)
{
struct RedirectInformation ri;
- GNUNET_HashCode key;
+ struct GNUNET_HashCode key;
struct TunnelState *state;
+ if ( ( (af == AF_INET) && (protocol == IPPROTO_ICMP) ) ||
+ ( (af == AF_INET6) && (protocol == IPPROTO_ICMPV6) ) )
+ {
+ /* ignore ports */
+ destination_port = 0;
+ local_port = 0;
+ }
ri.remote_address.af = af;
if (af == AF_INET)
ri.remote_address.address.ipv4 = *((struct in_addr*) destination_ip);
return NULL;
/* Mark this connection as freshly used */
if (NULL == state_key)
- GNUNET_CONTAINER_heap_update_cost (connections_heap,
- state->heap_node,
- GNUNET_TIME_absolute_get ().abs_value);
+ GNUNET_CONTAINER_heap_update_cost (connections_heap,
+ state->specifics.tcp_udp.heap_node,
+ GNUNET_TIME_absolute_get ().abs_value_us);
return state;
}
*
* @param service_map map of services (TCP or UDP)
* @param desc service descriptor
- * @param dpt destination port
+ * @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 GNUNET_HashCode *desc,
- uint16_t dpt)
+ const struct GNUNET_HashCode *desc,
+ uint16_t destination_port)
{
- char key[sizeof (GNUNET_HashCode) + sizeof (uint16_t)];
+ char key[sizeof (struct GNUNET_HashCode) + sizeof (uint16_t)];
- memcpy (&key[0], &dpt, sizeof (uint16_t));
- memcpy (&key[sizeof(uint16_t)], desc, sizeof (GNUNET_HashCode));
+ 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,
- (GNUNET_HashCode *) key);
+ (struct GNUNET_HashCode *) key);
}
*/
static int
free_service_record (void *cls,
- const GNUNET_HashCode *key,
+ const struct GNUNET_HashCode *key,
void *value)
{
struct LocalService *service = value;
* respective service entry.
*
* @param service_map map of services (TCP or UDP)
- * @param name name of the service
- * @param dpt destination port
+ * @param name name of the service
+ * @param destination_port destination port
* @param service service information record to store (service->name will be set).
*/
static void
store_service (struct GNUNET_CONTAINER_MultiHashMap *service_map,
const char *name,
- uint16_t dpt,
+ uint16_t destination_port,
struct LocalService *service)
{
- char key[sizeof (GNUNET_HashCode) + sizeof (uint16_t)];
- GNUNET_HashCode desc;
+ char key[sizeof (struct GNUNET_HashCode) + sizeof (uint16_t)];
+ struct GNUNET_HashCode desc;
GNUNET_CRYPTO_hash (name, strlen (name) + 1, &desc);
service->name = GNUNET_strdup (name);
- memcpy (&key[0], &dpt, sizeof (uint16_t));
- memcpy (&key[sizeof(uint16_t)], &desc, sizeof (GNUNET_HashCode));
+ 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,
- (GNUNET_HashCode *) key,
+ (struct GNUNET_HashCode *) key,
service,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
{
- free_service_record (NULL, (GNUNET_HashCode *) key, service);
+ 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) dpt);
+ (unsigned int) destination_port);
}
}
struct TunnelMessageQueue *tnq;
s->th = NULL;
- tnq = s->head;
+ 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->head,
- s->tail,
- tnq);
+ GNUNET_CONTAINER_DLL_remove (s->specifics.tcp_udp.head,
+ s->specifics.tcp_udp.tail,
+ tnq);
GNUNET_free (tnq);
- if (NULL != (tnq = s->head))
- s->th = GNUNET_MESH_notify_transmit_ready (tunnel,
- GNUNET_NO /* corking */,
- 0 /* priority */,
+ if (NULL != (tnq = s->specifics.tcp_udp.head))
+ s->th = GNUNET_MESH_notify_transmit_ready (tunnel,
+ GNUNET_NO /* corking */,
GNUNET_TIME_UNIT_FOREVER_REL,
- NULL,
tnq->len,
&send_to_peer_notify_callback,
s);
/**
* Send the given packet via the mesh tunnel.
*
- * @param mesh_tunnel destination
+ * @param s tunnel destination
* @param tnq message to queue
*/
static void
-send_packet_to_mesh_tunnel (struct GNUNET_MESH_Tunnel *mesh_tunnel,
+send_packet_to_mesh_tunnel (struct TunnelState *s,
struct TunnelMessageQueue *tnq)
{
- struct TunnelState *s;
+ struct GNUNET_MESH_Tunnel *mesh_tunnel;
- s = GNUNET_MESH_tunnel_get_data (mesh_tunnel);
+ mesh_tunnel = s->tunnel;
GNUNET_assert (NULL != s);
- GNUNET_CONTAINER_DLL_insert_tail (s->head, s->tail, tnq);
+ 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 */, 0 /* priority */,
+ s->th = GNUNET_MESH_notify_transmit_ready (mesh_tunnel,
+ GNUNET_NO /* cork */,
GNUNET_TIME_UNIT_FOREVER_REL,
- NULL, tnq->len,
+ tnq->len,
&send_to_peer_notify_callback,
s);
}
* @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
+ * @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,
+icmp_from_helper (const struct GNUNET_TUN_IcmpHeader *icmp,
size_t pktlen,
int af,
- const void *destination_ip,
+ const void *destination_ip,
const void *source_ip)
{
struct TunnelState *state;
const struct GNUNET_TUN_IPv6Header *ipv6;
const struct GNUNET_TUN_UdpHeader *udp;
size_t mlen;
- uint16_t spt;
- uint16_t dpt;
+ uint16_t source_port;
+ uint16_t destination_port;
uint8_t protocol;
{
sbuf, sizeof (sbuf)),
inet_ntop (af,
destination_ip,
- dbuf, sizeof (dbuf)));
+ dbuf, sizeof (dbuf)));
}
if (pktlen < sizeof (struct GNUNET_TUN_IcmpHeader))
{
/* 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 */
- spt = 0;
- dpt = 0;
- protocol = IPPROTO_ICMP;
+ 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_DESTINATION_UNREACHABLE:
case GNUNET_TUN_ICMPTYPE_SOURCE_QUENCH:
case GNUNET_TUN_ICMPTYPE_TIME_EXCEEDED:
- if (pktlen <
+ if (pktlen <
sizeof (struct GNUNET_TUN_IcmpHeader) +
sizeof (struct GNUNET_TUN_IPv4Header) + 8)
{
/* 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];
- spt = ntohs (udp->spt);
- dpt = ntohs (udp->dpt);
+ /* 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 ("# ICMP packets dropped (not allowed)"),
+ 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 <
+ if (pktlen <
sizeof (struct GNUNET_TUN_IcmpHeader) +
sizeof (struct GNUNET_TUN_IPv6Header) + 8)
{
/* 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];
- spt = ntohs (udp->spt);
- dpt = ntohs (udp->dpt);
+ /* 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;
break;
default:
GNUNET_STATISTICS_update (stats,
- gettext_noop ("# ICMP packets dropped (not allowed)"),
+ gettext_noop ("# ICMPv6 packets dropped (type not allowed)"),
1, GNUNET_NO);
return;
}
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,
- spt,
+ source_port,
destination_ip,
- dpt,
+ destination_port,
NULL);
break;
case IPPROTO_TCP:
state = get_redirect_state (af, IPPROTO_TCP,
source_ip,
- spt,
+ source_port,
destination_ip,
- dpt,
+ destination_port,
NULL);
break;
default:
return;
}
mlen = sizeof (struct GNUNET_EXIT_IcmpToVPNMessage) + pktlen - sizeof (struct GNUNET_TUN_IcmpHeader);
- tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueue) + mlen);
+ tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueue) + mlen);
tnq->payload = &tnq[1];
tnq->len = mlen;
i2v = (struct GNUNET_EXIT_IcmpToVPNMessage *) &tnq[1];
memcpy (&i2v->icmp_header,
icmp,
pktlen);
- send_packet_to_mesh_tunnel (state->tunnel,
- tnq);
+ send_packet_to_mesh_tunnel (state, tnq);
}
* @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
+ * @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,
+udp_from_helper (const struct GNUNET_TUN_UdpHeader *udp,
size_t pktlen,
int af,
- const void *destination_ip,
+ const void *destination_ip,
const void *source_ip)
{
struct TunnelState *state;
inet_ntop (af,
source_ip,
sbuf, sizeof (sbuf)),
- (unsigned int) ntohs (udp->spt),
+ (unsigned int) ntohs (udp->source_port),
inet_ntop (af,
destination_ip,
dbuf, sizeof (dbuf)),
- (unsigned int) ntohs (udp->dpt));
+ (unsigned int) ntohs (udp->destination_port));
}
if (pktlen < sizeof (struct GNUNET_TUN_UdpHeader))
{
}
state = get_redirect_state (af, IPPROTO_UDP,
source_ip,
- ntohs (udp->spt),
+ ntohs (udp->source_port),
destination_ip,
- ntohs (udp->dpt),
+ ntohs (udp->destination_port),
NULL);
if (NULL == state)
{
return;
}
mlen = sizeof (struct GNUNET_EXIT_UdpReplyMessage) + pktlen - sizeof (struct GNUNET_TUN_UdpHeader);
- tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueue) + mlen);
+ tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueue) + mlen);
tnq->payload = &tnq[1];
tnq->len = mlen;
urm = (struct GNUNET_EXIT_UdpReplyMessage *) &tnq[1];
memcpy (&urm[1],
&udp[1],
pktlen - sizeof (struct GNUNET_TUN_UdpHeader));
- send_packet_to_mesh_tunnel (state->tunnel,
- tnq);
+ send_packet_to_mesh_tunnel (state, tnq);
}
* @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
+ * @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
-tcp_from_helper (const struct GNUNET_TUN_TcpHeader *tcp,
+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;
- char buf[pktlen];
+ char buf[pktlen] GNUNET_ALIGN;
struct GNUNET_TUN_TcpHeader *mtcp;
struct GNUNET_EXIT_TcpDataMessage *tdm;
struct TunnelMessageQueue *tnq;
inet_ntop (af,
source_ip,
sbuf, sizeof (sbuf)),
- (unsigned int) ntohs (tcp->spt),
+ (unsigned int) ntohs (tcp->source_port),
inet_ntop (af,
destination_ip,
dbuf, sizeof (dbuf)),
- (unsigned int) ntohs (tcp->dpt));
+ (unsigned int) ntohs (tcp->destination_port));
}
if (pktlen < sizeof (struct GNUNET_TUN_TcpHeader))
{
return;
}
state = get_redirect_state (af, IPPROTO_TCP,
- source_ip,
- ntohs (tcp->spt),
+ source_ip,
+ ntohs (tcp->source_port),
destination_ip,
- ntohs (tcp->dpt),
+ 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);
+ memcpy (buf, tcp, pktlen);
mtcp = (struct GNUNET_TUN_TcpHeader *) buf;
- mtcp->spt = 0;
- mtcp->dpt = 0;
+ mtcp->source_port = 0;
+ mtcp->destination_port = 0;
mtcp->crc = 0;
mlen = sizeof (struct GNUNET_EXIT_TcpDataMessage) + (pktlen - sizeof (struct GNUNET_TUN_TcpHeader));
tdm->header.type = htons (GNUNET_MESSAGE_TYPE_VPN_TCP_DATA_TO_VPN);
tdm->reserved = htonl (0);
memcpy (&tdm->tcp_header,
- buf,
+ buf,
pktlen);
- send_packet_to_mesh_tunnel (state->tunnel,
- tnq);
+ send_packet_to_mesh_tunnel (state, tnq);
}
* @param client unsued
* @param message message received from helper
*/
-static void
+static int
message_token (void *cls GNUNET_UNUSED, void *client GNUNET_UNUSED,
const struct GNUNET_MessageHeader *message)
{
if (ntohs (message->type) != GNUNET_MESSAGE_TYPE_VPN_HELPER)
{
GNUNET_break (0);
- return;
+ return GNUNET_OK;
}
size = ntohs (message->size);
if (size < sizeof (struct GNUNET_TUN_Layer2PacketHeader) + sizeof (struct GNUNET_MessageHeader))
{
GNUNET_break (0);
- return;
+ return GNUNET_OK;
}
GNUNET_STATISTICS_update (stats,
gettext_noop ("# Bytes received from TUN"),
{
/* Kernel to blame? */
GNUNET_break (0);
- return;
+ 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;
+ 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;
+ 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->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->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->destination_address,
&pkt4->source_address);
break;
default:
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("IPv4 packet with unsupported next header received. Ignored.\n"));
- return;
+ _("IPv4 packet with unsupported next header %u received. Ignored.\n"),
+ (int) pkt4->protocol);
+ return GNUNET_OK;
}
}
break;
{
/* Kernel to blame? */
GNUNET_break (0);
- return;
+ return GNUNET_OK;
}
pkt6 = (struct GNUNET_TUN_IPv6Header *) &pkt_tun[1];
- if (size != ntohs (pkt6->payload_length))
+ if (size != ntohs (pkt6->payload_length) + sizeof (struct GNUNET_TUN_IPv6Header))
{
/* Kernel to blame? */
GNUNET_break (0);
- return;
+ 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->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->destination_address,
&pkt6->source_address);
break;
- case IPPROTO_ICMP:
+ case IPPROTO_ICMPV6:
icmp_from_helper ((const struct GNUNET_TUN_IcmpHeader *) &pkt6[1], size,
AF_INET6,
- &pkt6->destination_address,
+ &pkt6->destination_address,
&pkt6->source_address);
break;
default:
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("IPv6 packet with unsupported next header received. Ignored.\n"));
- return;
+ _("IPv6 packet with unsupported next header %d received. Ignored.\n"),
+ pkt6->next_header);
+ return GNUNET_OK;
}
}
break;
ntohs (pkt_tun->proto));
break;
}
+ return GNUNET_OK;
}
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 (proto == IPPROTO_ICMP)
+ 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);
+ local_address->port
+ = (uint16_t) 32768 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+ 28232);
switch (af)
{
case AF_INET:
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,
+ 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;
}
struct in6_addr mask;
struct in6_addr rnd;
int i;
-
+
addr = exit_ipv6addr;
GNUNET_assert (ipv6prefix < 128);
if (ipv6prefix == 127)
/* Given ABCD::/96, we want a mask of 'ABCD::FFFF:FFFF,
thus: */
mask = addr;
- for (i=127;i>=128-ipv6prefix;i--)
+ 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);
- }
+ }
}
* cleaning up 'old' states.
*
* @param state skeleton state to setup a record for; should
- * 'state->ri.remote_address' filled in so that
+ * '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
* already be set); after calling this function,
static void
setup_state_record (struct TunnelState *state)
{
- GNUNET_HashCode key;
+ struct GNUNET_HashCode key;
struct TunnelState *s;
/* generate fresh, unique address */
do
{
- if (NULL == state->serv)
- setup_fresh_address (state->ri.remote_address.af,
- state->ri.remote_address.proto,
- &state->ri.local_address);
+ if (NULL == state->specifics.tcp_udp.serv)
+ setup_fresh_address (state->specifics.tcp_udp.ri.remote_address.af,
+ state->specifics.tcp_udp.ri.remote_address.proto,
+ &state->specifics.tcp_udp.ri.local_address);
else
- setup_fresh_address (state->serv->address.af,
- state->serv->address.proto,
- &state->ri.local_address);
- } while (NULL != get_redirect_state (state->ri.remote_address.af,
- state->ri.remote_address.proto,
- &state->ri.remote_address.address,
- state->ri.remote_address.port,
- &state->ri.local_address.address,
- state->ri.local_address.port,
+ 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));
{
char buf[INET6_ADDRSTRLEN];
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Picked local address %s:%u for new connection\n",
- inet_ntop (state->ri.local_address.af,
- &state->ri.local_address.address,
+ inet_ntop (state->specifics.tcp_udp.ri.local_address.af,
+ &state->specifics.tcp_udp.ri.local_address.address,
buf, sizeof (buf)),
- (unsigned int) state->ri.local_address.port);
+ (unsigned int) state->specifics.tcp_udp.ri.local_address.port);
}
- state->state_key = key;
+ 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->heap_node = GNUNET_CONTAINER_heap_insert (connections_heap,
+ state->specifics.tcp_udp.heap_node = GNUNET_CONTAINER_heap_insert (connections_heap,
state,
- GNUNET_TIME_absolute_get ().abs_value);
+ 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->heap_node = NULL;
+ s->specifics.tcp_udp.heap_node = NULL;
GNUNET_MESH_tunnel_destroy (s->tunnel);
GNUNET_assert (GNUNET_OK ==
GNUNET_CONTAINER_multihashmap_remove (connections_map,
- &s->state_key,
+ &s->specifics.tcp_udp.state_key,
s));
GNUNET_free (s);
}
* 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 pkt6 where to write the assembled packet; must
+ * @param pkt4 where to write the assembled packet; must
* contain enough space for the IP header, UDP/TCP header
* AND the payload
*/
{
struct GNUNET_TUN_UdpHeader *pkt4_udp = (struct GNUNET_TUN_UdpHeader *) &pkt4[1];
- pkt4_udp->spt = htons (src_address->port);
- pkt4_udp->dpt = htons (dst_address->port);
+ 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,
case IPPROTO_TCP:
{
struct GNUNET_TUN_TcpHeader *pkt4_tcp = (struct GNUNET_TUN_TcpHeader *) &pkt4[1];
-
- memcpy (pkt4_tcp, tcp_header, sizeof (struct GNUNET_TUN_TcpHeader));
- pkt4_tcp->spt = htons (src_address->port);
- pkt4_tcp->dpt = htons (dst_address->port);
+
+ *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,
* 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
len += sizeof (struct GNUNET_TUN_UdpHeader);
break;
case IPPROTO_TCP:
- /* tcp_header (with port/crc not set) must be part of payload! */
- if (len < sizeof (struct GNUNET_TUN_TcpHeader))
- {
- GNUNET_break (0);
- return;
- }
+ len += sizeof (struct GNUNET_TUN_TcpHeader);
break;
default:
GNUNET_break (0);
GNUNET_TUN_initialize_ipv6_header (pkt6,
protocol,
- len,
- &dst_address->address.ipv6,
- &src_address->address.ipv6);
+ len,
+ &src_address->address.ipv6,
+ &dst_address->address.ipv6);
switch (protocol)
{
{
struct GNUNET_TUN_UdpHeader *pkt6_udp = (struct GNUNET_TUN_UdpHeader *) &pkt6[1];
- pkt6_udp->spt = htons (src_address->port);
- pkt6_udp->dpt = htons (dst_address->port);
+ pkt6_udp->source_port = htons (src_address->port);
+ pkt6_udp->destination_port = htons (dst_address->port);
pkt6_udp->len = htons ((uint16_t) payload_length);
- pkt6_udp->crc = 0;
GNUNET_TUN_calculate_udp6_checksum (pkt6,
pkt6_udp,
payload,
payload_length);
- memcpy (&pkt6[1], 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;
+ struct GNUNET_TUN_TcpHeader *pkt6_tcp = (struct GNUNET_TUN_TcpHeader *) &pkt6[1];
/* memcpy first here as some TCP header fields are initialized this way! */
- memcpy (pkt6_tcp, payload, payload_length);
- pkt6_tcp->spt = htons (src_address->port);
- pkt6_tcp->dpt = htons (dst_address->port);
+ *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:
*
* @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 template to use
+ * @param tcp_header header template to use
* @param payload payload of the TCP packet
* @param payload_length number of bytes in 'payload'
*/
return;
}
{
- char buf[len];
+ 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->proto = htons (ETH_P_IPV4);
prepare_ipv4_packet (payload, payload_length,
IPPROTO_TCP,
- tcp_header,
+ tcp_header,
source_address,
destination_address,
ipv4);
struct GNUNET_TUN_IPv6Header * ipv6 = (struct GNUNET_TUN_IPv6Header*) &tun[1];
tun->proto = htons (ETH_P_IPV6);
- prepare_ipv6_packet (payload, payload_length,
+ prepare_ipv6_packet (payload, payload_length,
IPPROTO_TCP,
- tcp_header,
+ tcp_header,
source_address,
destination_address,
ipv6);
GNUNET_assert (0);
break;
}
- (void) GNUNET_HELPER_send (helper_handle,
- (const struct GNUNET_MessageHeader*) buf,
- GNUNET_YES,
- NULL, NULL);
+ if (NULL != helper_handle)
+ (void) GNUNET_HELPER_send (helper_handle,
+ (const struct GNUNET_MessageHeader*) buf,
+ GNUNET_YES,
+ NULL, NULL);
}
}
* @param cls closure, NULL
* @param tunnel connection to the other end
* @param tunnel_ctx pointer to our 'struct TunnelState *'
- * @param sender who sent the message
* @param message the actual message
- * @param atsi performance data for the connection
+ *
* @return GNUNET_OK to keep the connection open,
* GNUNET_SYSERR to close it (signal serious error)
*/
static int
-receive_tcp_service (void *unused GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
+receive_tcp_service (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
void **tunnel_ctx GNUNET_UNUSED,
- const struct GNUNET_PeerIdentity *sender GNUNET_UNUSED,
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_ATS_Information *atsi GNUNET_UNUSED)
+ const struct GNUNET_MessageHeader *message)
{
struct TunnelState *state = *tunnel_ctx;
const struct GNUNET_EXIT_TcpServiceStartMessage *start;
uint16_t pkt_len = ntohs (message->size);
+ 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);
}
start = (const struct GNUNET_EXIT_TcpServiceStartMessage*) message;
pkt_len -= sizeof (struct GNUNET_EXIT_TcpServiceStartMessage);
- if ( (NULL == state) ||
- (NULL != state->serv) ||
- (NULL != state->heap_node) )
+ 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;
/* 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 (sender),
+ GNUNET_i2s (&state->peer),
GNUNET_h2s (&start->service_descriptor),
- (unsigned int) ntohs (start->tcp_header.dpt));
- if (NULL == (state->serv = find_service (tcp_services, &start->service_descriptor,
- ntohs (start->tcp_header.dpt))))
+ (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,
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
_("No service found for %s on port %d!\n"),
"TCP",
- ntohs (start->tcp_header.dpt));
+ 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->ri.remote_address = state->serv->address;
+ state->specifics.tcp_udp.ri.remote_address = state->specifics.tcp_udp.serv->address;
setup_state_record (state);
- send_tcp_packet_via_tun (&state->ri.remote_address,
- &state->ri.local_address,
+ 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;
* @param cls closure, NULL
* @param tunnel connection to the other end
* @param tunnel_ctx pointer to our 'struct TunnelState *'
- * @param sender who sent the message
* @param message the actual message
- * @param atsi performance data for the connection
+ *
* @return GNUNET_OK to keep the connection open,
* GNUNET_SYSERR to close it (signal serious error)
*/
static int
receive_tcp_remote (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
void **tunnel_ctx GNUNET_UNUSED,
- const struct GNUNET_PeerIdentity *sender GNUNET_UNUSED,
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_ATS_Information *atsi GNUNET_UNUSED)
+ const struct GNUNET_MessageHeader *message)
{
struct TunnelState *state = *tunnel_ctx;
const struct GNUNET_EXIT_TcpInternetStartMessage *start;
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 */
+ state->is_dns = GNUNET_NO;
+ }
GNUNET_STATISTICS_update (stats,
gettext_noop ("# Bytes received from MESH"),
pkt_len, GNUNET_NO);
return GNUNET_SYSERR;
}
start = (const struct GNUNET_EXIT_TcpInternetStartMessage*) message;
- pkt_len -= sizeof (struct GNUNET_EXIT_TcpInternetStartMessage);
- if ( (NULL == state) ||
- (NULL != state->serv) ||
- (NULL != state->heap_node) )
+ 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);
- state->ri.remote_address.af = af;
+ state->specifics.tcp_udp.ri.remote_address.af = af;
switch (af)
{
case AF_INET:
v4 = (const struct in_addr*) &start[1];
payload = &v4[1];
pkt_len -= sizeof (struct in_addr);
- state->ri.remote_address.address.ipv4 = *v4;
+ state->specifics.tcp_udp.ri.remote_address.address.ipv4 = *v4;
break;
case AF_INET6:
if (pkt_len < sizeof (struct in6_addr))
v6 = (const struct in6_addr*) &start[1];
payload = &v6[1];
pkt_len -= sizeof (struct in6_addr);
- state->ri.remote_address.address.ipv6 = *v6;
+ state->specifics.tcp_udp.ri.remote_address.address.ipv6 = *v6;
break;
default:
GNUNET_break_op (0);
char buf[INET6_ADDRSTRLEN];
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received data from %s for starting TCP stream to %s:%u\n",
- GNUNET_i2s (sender),
- inet_ntop (af,
- &state->ri.remote_address.address,
+ GNUNET_i2s (&state->peer),
+ inet_ntop (af,
+ &state->specifics.tcp_udp.ri.remote_address.address,
buf, sizeof (buf)),
- (unsigned int) ntohs (start->tcp_header.dpt));
+ (unsigned int) ntohs (start->tcp_header.destination_port));
}
-
- state->ri.remote_address.proto = IPPROTO_TCP;
- state->ri.remote_address.port = ntohs (start->tcp_header.dpt);
+ 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->ri.remote_address,
- &state->ri.local_address,
+ 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;
/**
- * Process a request to forward TCP data on an established
+ * Process a request to forward TCP data on an established
* connection via this peer.
*
* @param cls closure, NULL
* @param tunnel connection to the other end
* @param tunnel_ctx pointer to our 'struct TunnelState *'
- * @param sender who sent the message
* @param message the actual message
- * @param atsi performance data for the connection
+ *
* @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_PeerIdentity *sender GNUNET_UNUSED,
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_ATS_Information *atsi GNUNET_UNUSED)
+ const struct GNUNET_MessageHeader *message)
{
struct TunnelState *state = *tunnel_ctx;
const struct GNUNET_EXIT_TcpDataMessage *data;
uint16_t pkt_len = ntohs (message->size);
+ 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 ("# Bytes received from MESH"),
pkt_len, GNUNET_NO);
return GNUNET_SYSERR;
}
data = (const struct GNUNET_EXIT_TcpDataMessage*) message;
- pkt_len -= sizeof (struct GNUNET_EXIT_TcpDataMessage);
+ pkt_len -= sizeof (struct GNUNET_EXIT_TcpDataMessage);
if ( (NULL == state) ||
- (NULL == state->heap_node) )
+ (NULL == state->specifics.tcp_udp.heap_node) )
{
/* connection should have been up! */
GNUNET_STATISTICS_update (stats,
1, GNUNET_NO);
return GNUNET_SYSERR;
}
+ if (data->tcp_header.off * 4 < sizeof (struct GNUNET_TUN_TcpHeader))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+
GNUNET_break_op (ntohl (data->reserved) == 0);
{
char buf[INET6_ADDRSTRLEN];
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received additional %u bytes of data from %s for TCP stream to %s:%u\n",
pkt_len,
- GNUNET_i2s (sender),
- inet_ntop (state->ri.remote_address.af,
- &state->ri.remote_address.address,
+ GNUNET_i2s (&state->peer),
+ inet_ntop (state->specifics.tcp_udp.ri.remote_address.af,
+ &state->specifics.tcp_udp.ri.remote_address.address,
buf, sizeof (buf)),
- (unsigned int) state->ri.remote_address.port);
+ (unsigned int) state->specifics.tcp_udp.ri.remote_address.port);
}
- send_tcp_packet_via_tun (&state->ri.remote_address,
- &state->ri.local_address,
+ send_tcp_packet_via_tun (&state->specifics.tcp_udp.ri.remote_address,
+ &state->specifics.tcp_udp.ri.local_address,
&data->tcp_header,
&data[1], pkt_len);
return GNUNET_YES;
return;
}
{
- char buf[len];
+ 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->proto = htons (ETH_P_IPV6);
GNUNET_TUN_initialize_ipv6_header (ipv6,
- IPPROTO_ICMP,
+ IPPROTO_ICMPV6,
sizeof (struct GNUNET_TUN_IcmpHeader) + payload_length,
&source_address->address.ipv6,
&destination_address->address.ipv6);
GNUNET_TUN_calculate_icmp_checksum (icmp,
payload,
payload_length);
- (void) GNUNET_HELPER_send (helper_handle,
- (const struct GNUNET_MessageHeader*) buf,
- GNUNET_YES,
- NULL, NULL);
+ if (NULL != helper_handle)
+ (void) GNUNET_HELPER_send (helper_handle,
+ (const struct GNUNET_MessageHeader*) buf,
+ GNUNET_YES,
+ NULL, NULL);
}
}
+/**
+ * Synthesize a plausible ICMP payload for an ICMPv4 error
+ * response on the given tunnel.
+ *
+ * @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
+ */
+static void
+make_up_icmpv4_payload (struct TunnelState *state,
+ struct GNUNET_TUN_IPv4Header *ipp,
+ struct GNUNET_TUN_UdpHeader *udp)
+{
+ 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 ICMPv6 error
+ * response on the given tunnel.
+ *
+ * @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
+ */
+static void
+make_up_icmpv6_payload (struct TunnelState *state,
+ struct GNUNET_TUN_IPv6Header *ipp,
+ struct GNUNET_TUN_UdpHeader *udp)
+{
+ 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);
+}
+
+
/**
* 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 sender who sent the message
* @param message the actual message
- * @param atsi performance data for the connection
+ *
* @return GNUNET_OK to keep the connection open,
* GNUNET_SYSERR to close it (signal serious error)
*/
static int
receive_icmp_remote (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
void **tunnel_ctx GNUNET_UNUSED,
- const struct GNUNET_PeerIdentity *sender GNUNET_UNUSED,
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_ATS_Information *atsi GNUNET_UNUSED)
+ const struct GNUNET_MessageHeader *message)
{
struct TunnelState *state = *tunnel_ctx;
const struct GNUNET_EXIT_IcmpInternetMessage *msg;
uint16_t pkt_len = ntohs (message->size);
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 */
+ state->is_dns = GNUNET_NO;
+ }
GNUNET_STATISTICS_update (stats,
gettext_noop ("# Bytes received from MESH"),
pkt_len, GNUNET_NO);
return GNUNET_SYSERR;
}
msg = (const struct GNUNET_EXIT_IcmpInternetMessage*) message;
- pkt_len -= sizeof (struct GNUNET_EXIT_IcmpInternetMessage);
+ pkt_len -= sizeof (struct GNUNET_EXIT_IcmpInternetMessage);
af = (int) ntohl (msg->af);
- state->ri.remote_address.af = 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 */
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+
switch (af)
{
case AF_INET:
v4 = (const struct in_addr*) &msg[1];
payload = &v4[1];
pkt_len -= sizeof (struct in_addr);
- state->ri.remote_address.address.ipv4 = *v4;
+ state->specifics.tcp_udp.ri.remote_address.address.ipv4 = *v4;
+ if (NULL == state->specifics.tcp_udp.heap_node)
+ {
+ state->specifics.tcp_udp.ri.remote_address.af = af;
+ state->specifics.tcp_udp.ri.remote_address.proto = IPPROTO_ICMP;
+ setup_state_record (state);
+ }
+ /* check that ICMP type is something we want to support
+ and possibly make up payload! */
+ switch (msg->icmp_header.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 (0 != pkt_len)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ /* make up payload */
+ {
+ struct GNUNET_TUN_IPv4Header *ipp = (struct GNUNET_TUN_IPv4Header *) buf;
+ struct GNUNET_TUN_UdpHeader *udp = (struct GNUNET_TUN_UdpHeader *) &ipp[1];
+
+ GNUNET_assert (8 == sizeof (struct GNUNET_TUN_UdpHeader));
+ pkt_len = sizeof (struct GNUNET_TUN_IPv4Header) + 8;
+ make_up_icmpv4_payload (state,
+ ipp,
+ udp);
+ payload = ipp;
+ }
+ break;
+ default:
+ GNUNET_break_op (0);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv4 packets dropped (type not allowed)"),
+ 1, GNUNET_NO);
+ return GNUNET_SYSERR;
+ }
+ /* end AF_INET */
break;
case AF_INET6:
if (pkt_len < sizeof (struct in6_addr))
v6 = (const struct in6_addr*) &msg[1];
payload = &v6[1];
pkt_len -= sizeof (struct in6_addr);
- state->ri.remote_address.address.ipv6 = *v6;
+ state->specifics.tcp_udp.ri.remote_address.address.ipv6 = *v6;
+ if (NULL == state->specifics.tcp_udp.heap_node)
+ {
+ state->specifics.tcp_udp.ri.remote_address.af = af;
+ state->specifics.tcp_udp.ri.remote_address.proto = IPPROTO_ICMPV6;
+ setup_state_record (state);
+ }
+ /* check that ICMP type is something we want to support
+ and possibly make up payload! */
+ switch (msg->icmp_header.type)
+ {
+ case GNUNET_TUN_ICMPTYPE6_ECHO_REPLY:
+ case GNUNET_TUN_ICMPTYPE6_ECHO_REQUEST:
+ break;
+ 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 (0 != pkt_len)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ /* make up payload */
+ {
+ struct GNUNET_TUN_IPv6Header *ipp = (struct GNUNET_TUN_IPv6Header *) buf;
+ struct GNUNET_TUN_UdpHeader *udp = (struct GNUNET_TUN_UdpHeader *) &ipp[1];
+
+ GNUNET_assert (8 == sizeof (struct GNUNET_TUN_UdpHeader));
+ pkt_len = sizeof (struct GNUNET_TUN_IPv6Header) + 8;
+ make_up_icmpv6_payload (state,
+ ipp,
+ udp);
+ payload = ipp;
+ }
+ break;
+ default:
+ GNUNET_break_op (0);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv6 packets dropped (type not allowed)"),
+ 1, GNUNET_NO);
+ return GNUNET_SYSERR;
+ }
+ /* end AF_INET6 */
break;
default:
+ /* bad AF */
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
-
+
{
char buf[INET6_ADDRSTRLEN];
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received ICMP data from %s for forwarding to %s\n",
- GNUNET_i2s (sender),
- inet_ntop (af,
- &state->ri.remote_address.address,
+ GNUNET_i2s (&state->peer),
+ inet_ntop (af,
+ &state->specifics.tcp_udp.ri.remote_address.address,
buf, sizeof (buf)));
}
-
- /* FIXME: check that ICMP type is something we want to support */
-
- state->ri.remote_address.proto = IPPROTO_ICMP;
- state->ri.remote_address.port = 0;
- state->ri.local_address.port = 0;
- if (NULL == state->heap_node)
- setup_state_record (state);
-
- send_icmp_packet_via_tun (&state->ri.remote_address,
- &state->ri.local_address,
+ send_icmp_packet_via_tun (&state->specifics.tcp_udp.ri.remote_address,
+ &state->specifics.tcp_udp.ri.local_address,
&msg->icmp_header,
payload, pkt_len);
return GNUNET_YES;
}
+/**
+ * Setup ICMP payload for ICMP error messages. Called
+ * for both IPv4 and IPv6 addresses.
+ *
+ * @param state context for creating the IP Packet
+ * @param buf where to create the payload, has at least
+ * sizeof (struct GNUNET_TUN_IPv6Header) + 8 bytes
+ * @return number of bytes of payload we created in buf
+ */
+static uint16_t
+make_up_icmp_service_payload (struct TunnelState *state,
+ char *buf)
+{
+ switch (state->specifics.tcp_udp.serv->address.af)
+ {
+ case AF_INET:
+ {
+ 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,
+ ipv4,
+ udp);
+ GNUNET_assert (8 == sizeof (struct GNUNET_TUN_UdpHeader));
+ return sizeof (struct GNUNET_TUN_IPv4Header) + 8;
+ }
+ break;
+ case AF_INET6:
+ {
+ struct GNUNET_TUN_IPv6Header *ipv6;
+ struct GNUNET_TUN_UdpHeader *udp;
+
+ ipv6 = (struct GNUNET_TUN_IPv6Header *)buf;
+ udp = (struct GNUNET_TUN_UdpHeader *) &ipv6[1];
+ make_up_icmpv6_payload (state,
+ ipv6,
+ udp);
+ GNUNET_assert (8 == sizeof (struct GNUNET_TUN_UdpHeader));
+ return sizeof (struct GNUNET_TUN_IPv6Header) + 8;
+ }
+ break;
+ default:
+ GNUNET_break (0);
+ }
+ return 0;
+}
+
+
/**
* Process a request via mesh 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 sender who sent the message
* @param message the actual message
- * @param atsi performance data for the connection
+ *
* @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_PeerIdentity *sender GNUNET_UNUSED,
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_ATS_Information *atsi GNUNET_UNUSED)
+ const struct GNUNET_MessageHeader *message)
{
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;
+ 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 ("# Bytes received from MESH"),
pkt_len, GNUNET_NO);
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 (sender),
+ GNUNET_i2s (&state->peer),
GNUNET_h2s (&msg->service_descriptor));
- if (NULL == state->serv)
+ 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;
}
- if (state->serv->address.af != ntohl (msg->af))
+ icmp = msg->icmp_header;
+ payload = &msg[1];
+ 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,
+ perform ICMP PT if needed ans possibly make up payload */
+ switch (msg->af)
{
- GNUNET_STATISTICS_update (stats,
- gettext_noop ("# ICMP service requests discarded (incompatible af)"),
- 1, GNUNET_NO);
+ case AF_INET:
+ switch (msg->icmp_header.type)
+ {
+ case GNUNET_TUN_ICMPTYPE_ECHO_REPLY:
+ if (state->specifics.tcp_udp.serv->address.af == AF_INET6)
+ icmp.type = GNUNET_TUN_ICMPTYPE6_ECHO_REPLY;
+ break;
+ case GNUNET_TUN_ICMPTYPE_ECHO_REQUEST:
+ if (state->specifics.tcp_udp.serv->address.af == AF_INET6)
+ icmp.type = GNUNET_TUN_ICMPTYPE6_ECHO_REQUEST;
+ break;
+ case GNUNET_TUN_ICMPTYPE_DESTINATION_UNREACHABLE:
+ if (state->specifics.tcp_udp.serv->address.af == AF_INET6)
+ icmp.type = GNUNET_TUN_ICMPTYPE6_DESTINATION_UNREACHABLE;
+ if (0 != pkt_len)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ payload = buf;
+ pkt_len = make_up_icmp_service_payload (state, buf);
+ break;
+ case GNUNET_TUN_ICMPTYPE_TIME_EXCEEDED:
+ if (state->specifics.tcp_udp.serv->address.af == AF_INET6)
+ icmp.type = GNUNET_TUN_ICMPTYPE6_TIME_EXCEEDED;
+ if (0 != pkt_len)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ payload = buf;
+ pkt_len = make_up_icmp_service_payload (state, buf);
+ break;
+ case GNUNET_TUN_ICMPTYPE_SOURCE_QUENCH:
+ if (state->specifics.tcp_udp.serv->address.af == AF_INET6)
+ {
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv4 packets dropped (impossible PT to v6)"),
+ 1, GNUNET_NO);
+ return GNUNET_OK;
+ }
+ if (0 != pkt_len)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ payload = buf;
+ pkt_len = make_up_icmp_service_payload (state, buf);
+ break;
+ default:
+ GNUNET_break_op (0);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv4 packets dropped (type not allowed)"),
+ 1, GNUNET_NO);
+ return GNUNET_SYSERR;
+ }
+ /* end of AF_INET */
+ break;
+ case AF_INET6:
+ switch (msg->icmp_header.type)
+ {
+ case GNUNET_TUN_ICMPTYPE6_ECHO_REPLY:
+ if (state->specifics.tcp_udp.serv->address.af == AF_INET)
+ icmp.type = GNUNET_TUN_ICMPTYPE_ECHO_REPLY;
+ break;
+ case GNUNET_TUN_ICMPTYPE6_ECHO_REQUEST:
+ if (state->specifics.tcp_udp.serv->address.af == AF_INET)
+ icmp.type = GNUNET_TUN_ICMPTYPE_ECHO_REQUEST;
+ break;
+ case GNUNET_TUN_ICMPTYPE6_DESTINATION_UNREACHABLE:
+ if (state->specifics.tcp_udp.serv->address.af == AF_INET)
+ icmp.type = GNUNET_TUN_ICMPTYPE_DESTINATION_UNREACHABLE;
+ if (0 != pkt_len)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ payload = buf;
+ pkt_len = make_up_icmp_service_payload (state, buf);
+ break;
+ case GNUNET_TUN_ICMPTYPE6_TIME_EXCEEDED:
+ if (state->specifics.tcp_udp.serv->address.af == AF_INET)
+ icmp.type = GNUNET_TUN_ICMPTYPE_TIME_EXCEEDED;
+ if (0 != pkt_len)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ payload = buf;
+ pkt_len = make_up_icmp_service_payload (state, buf);
+ break;
+ case GNUNET_TUN_ICMPTYPE6_PACKET_TOO_BIG:
+ case GNUNET_TUN_ICMPTYPE6_PARAMETER_PROBLEM:
+ if (state->specifics.tcp_udp.serv->address.af == AF_INET)
+ {
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv6 packets dropped (impossible PT to v4)"),
+ 1, GNUNET_NO);
+ return GNUNET_OK;
+ }
+ if (0 != pkt_len)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ payload = buf;
+ pkt_len = make_up_icmp_service_payload (state, buf);
+ break;
+ default:
+ GNUNET_break_op (0);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMPv6 packets dropped (type not allowed)"),
+ 1, GNUNET_NO);
+ return GNUNET_SYSERR;
+ }
+ /* end of AF_INET6 */
+ break;
+ default:
+ GNUNET_break_op (0);
return GNUNET_SYSERR;
}
- /* FIXME: check that ICMP type is something we want to support */
-
- state->ri.remote_address = state->serv->address;
- setup_state_record (state);
-
- send_icmp_packet_via_tun (&state->ri.remote_address,
- &state->ri.local_address,
- &msg->icmp_header,
- &msg[1], pkt_len);
+ 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;
}
return;
}
{
- char buf[len];
+ 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);
struct GNUNET_TUN_IPv6Header * ipv6 = (struct GNUNET_TUN_IPv6Header*) &tun[1];
tun->proto = htons (ETH_P_IPV6);
- prepare_ipv6_packet (payload, payload_length,
+ prepare_ipv6_packet (payload, payload_length,
IPPROTO_UDP,
NULL,
source_address,
GNUNET_assert (0);
break;
}
- (void) GNUNET_HELPER_send (helper_handle,
- (const struct GNUNET_MessageHeader*) buf,
- GNUNET_YES,
- NULL, NULL);
+ if (NULL != helper_handle)
+ (void) GNUNET_HELPER_send (helper_handle,
+ (const struct GNUNET_MessageHeader*) buf,
+ GNUNET_YES,
+ NULL, NULL);
}
}
* @param cls closure, NULL
* @param tunnel connection to the other end
* @param tunnel_ctx pointer to our 'struct TunnelState *'
- * @param sender who sent the message
* @param message the actual message
- * @param atsi performance data for the connection
+ *
* @return GNUNET_OK to keep the connection open,
* GNUNET_SYSERR to close it (signal serious error)
*/
static int
receive_udp_remote (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
void **tunnel_ctx GNUNET_UNUSED,
- const struct GNUNET_PeerIdentity *sender GNUNET_UNUSED,
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_ATS_Information *atsi GNUNET_UNUSED)
+ const struct GNUNET_MessageHeader *message)
{
struct TunnelState *state = *tunnel_ctx;
const struct GNUNET_EXIT_UdpInternetMessage *msg;
const void *payload;
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 */
+ state->is_dns = GNUNET_NO;
+ }
GNUNET_STATISTICS_update (stats,
gettext_noop ("# Bytes received from MESH"),
pkt_len, GNUNET_NO);
return GNUNET_SYSERR;
}
msg = (const struct GNUNET_EXIT_UdpInternetMessage*) message;
- pkt_len -= sizeof (struct GNUNET_EXIT_UdpInternetMessage);
+ pkt_len -= sizeof (struct GNUNET_EXIT_UdpInternetMessage);
af = (int) ntohl (msg->af);
- state->ri.remote_address.af = af;
+ state->specifics.tcp_udp.ri.remote_address.af = af;
switch (af)
{
case AF_INET:
v4 = (const struct in_addr*) &msg[1];
payload = &v4[1];
pkt_len -= sizeof (struct in_addr);
- state->ri.remote_address.address.ipv4 = *v4;
+ state->specifics.tcp_udp.ri.remote_address.address.ipv4 = *v4;
break;
case AF_INET6:
if (pkt_len < sizeof (struct in6_addr))
v6 = (const struct in6_addr*) &msg[1];
payload = &v6[1];
pkt_len -= sizeof (struct in6_addr);
- state->ri.remote_address.address.ipv6 = *v6;
+ state->specifics.tcp_udp.ri.remote_address.address.ipv6 = *v6;
break;
default:
GNUNET_break_op (0);
char buf[INET6_ADDRSTRLEN];
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received data from %s for forwarding to UDP %s:%u\n",
- GNUNET_i2s (sender),
- inet_ntop (af,
- &state->ri.remote_address.address,
+ GNUNET_i2s (&state->peer),
+ inet_ntop (af,
+ &state->specifics.tcp_udp.ri.remote_address.address,
buf, sizeof (buf)),
- (unsigned int) ntohs (msg->destination_port));
+ (unsigned int) ntohs (msg->destination_port));
}
- state->ri.remote_address.proto = IPPROTO_UDP;
- state->ri.remote_address.port = msg->destination_port;
- if (NULL == state->heap_node)
+ 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->ri.local_address.port = msg->source_port;
- send_udp_packet_via_tun (&state->ri.remote_address,
- &state->ri.local_address,
+ 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;
}
* @param cls closure, NULL
* @param tunnel connection to the other end
* @param tunnel_ctx pointer to our 'struct TunnelState *'
- * @param sender who sent the message
* @param message the actual message
- * @param atsi performance data for the connection
+ *
* @return GNUNET_OK to keep the connection open,
* GNUNET_SYSERR to close it (signal serious error)
*/
static int
receive_udp_service (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
void **tunnel_ctx,
- const struct GNUNET_PeerIdentity *sender GNUNET_UNUSED,
- const struct GNUNET_MessageHeader *message,
- const struct GNUNET_ATS_Information *atsi GNUNET_UNUSED)
+ const struct GNUNET_MessageHeader *message)
{
struct TunnelState *state = *tunnel_ctx;
const struct GNUNET_EXIT_UdpServiceMessage *msg;
uint16_t pkt_len = ntohs (message->size);
+ 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 ("# Bytes received from MESH"),
pkt_len, GNUNET_NO);
}
msg = (const struct GNUNET_EXIT_UdpServiceMessage*) message;
pkt_len -= sizeof (struct GNUNET_EXIT_UdpServiceMessage);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received data from %s for forwarding to UDP service %s on port %u\n",
- GNUNET_i2s (sender),
- GNUNET_h2s (&msg->service_descriptor),
- (unsigned int) ntohs (msg->destination_port));
- if (NULL == (state->serv = find_service (udp_services, &msg->service_descriptor,
- ntohs (msg->destination_port))))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ 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));
1, GNUNET_NO);
return GNUNET_SYSERR;
}
- state->ri.remote_address = state->serv->address;
+ state->specifics.tcp_udp.ri.remote_address = state->specifics.tcp_udp.serv->address;
setup_state_record (state);
if (0 != ntohs (msg->source_port))
- state->ri.local_address.port = msg->source_port;
- send_udp_packet_via_tun (&state->ri.remote_address,
- &state->ri.local_address,
+ 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;
}
* @param cls closure
* @param tunnel new handle to the tunnel
* @param initiator peer that started the tunnel
- * @param atsi performance information for the tunnel
+ * @param port destination port
* @return initial tunnel context for the tunnel
*/
static void *
new_tunnel (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
- const struct GNUNET_PeerIdentity *initiator GNUNET_UNUSED,
- const struct GNUNET_ATS_Information *ats GNUNET_UNUSED)
+ const struct GNUNET_PeerIdentity *initiator, uint32_t port)
{
- struct TunnelState *s = GNUNET_malloc (sizeof (struct TunnelState));
+ struct TunnelState *s = GNUNET_new (struct TunnelState);
+ s->is_dns = GNUNET_SYSERR;
+ s->peer = *initiator;
GNUNET_STATISTICS_update (stats,
gettext_noop ("# Inbound MESH tunnels created"),
1, GNUNET_NO);
struct TunnelState *s = tunnel_ctx;
struct TunnelMessageQueue *tnq;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Tunnel destroyed\n");
- while (NULL != (tnq = s->head))
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Tunnel destroyed\n");
+ if (GNUNET_SYSERR == s->is_dns)
{
- GNUNET_CONTAINER_DLL_remove (s->head,
- s->tail,
- tnq);
- GNUNET_free (tnq);
+ GNUNET_free (s);
+ return;
}
- if (s->heap_node != NULL)
+ if (GNUNET_YES == s->is_dns)
{
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove (connections_map,
- &s->state_key,
- s));
- GNUNET_CONTAINER_heap_remove_node (s->heap_node);
- s->heap_node = NULL;
+ if (tunnels[s->specifics.dns.my_id] == s)
+ tunnels[s->specifics.dns.my_id] = NULL;
+ GNUNET_free_non_null (s->specifics.dns.reply);
+ }
+ else
+ {
+ while (NULL != (tnq = s->specifics.tcp_udp.head))
+ {
+ GNUNET_CONTAINER_DLL_remove (s->specifics.tcp_udp.head,
+ s->specifics.tcp_udp.tail,
+ tnq);
+ GNUNET_free (tnq);
+ }
+ if (NULL != s->specifics.tcp_udp.heap_node)
+ {
+ 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 != s->th)
{
*/
static int
free_iterate (void *cls GNUNET_UNUSED,
- const GNUNET_HashCode * hash GNUNET_UNUSED, void *value)
+ const struct GNUNET_HashCode * hash GNUNET_UNUSED, void *value)
{
GNUNET_free (value);
return GNUNET_YES;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Exit service is shutting down now\n");
- if (helper_handle != NULL)
+
+ if (NULL != helper_handle)
{
- GNUNET_HELPER_stop (helper_handle);
+ GNUNET_HELPER_stop (helper_handle, GNUNET_NO);
helper_handle = NULL;
}
- if (mesh_handle != NULL)
+ if (NULL != regex4)
+ {
+ GNUNET_REGEX_announce_cancel (regex4);
+ regex4 = NULL;
+ }
+ if (NULL != regex6)
+ {
+ GNUNET_REGEX_announce_cancel (regex6);
+ regex6 = NULL;
+ }
+ if (NULL != mesh_handle)
{
GNUNET_MESH_disconnect (mesh_handle);
mesh_handle = NULL;
GNUNET_CONTAINER_multihashmap_destroy (udp_services);
udp_services = NULL;
}
- if (stats != NULL)
+ if (NULL != dnsstub)
+ {
+ GNUNET_DNSSTUB_stop (dnsstub);
+ dnsstub = NULL;
+ }
+ if (NULL != peer_key)
+ {
+ GNUNET_free (peer_key);
+ peer_key = NULL;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != dht_task)
{
- GNUNET_STATISTICS_destroy (stats, GNUNET_YES);
+ GNUNET_SCHEDULER_cancel (dht_task);
+ dht_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (NULL != dht_put)
+ {
+ GNUNET_DHT_put_cancel (dht_put);
+ dht_put = NULL;
+ }
+ if (NULL != dht)
+ {
+ GNUNET_DHT_disconnect (dht);
+ dht = NULL;
+ }
+ if (NULL != stats)
+ {
+ GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
stats = NULL;
}
- for (i=0;i<5;i++)
+ for (i=0;i<8;i++)
GNUNET_free_non_null (exit_argv[i]);
}
}
hostport[0] = '\0';
hostport++;
-
+
int local_port = atoi (redirect);
int remote_port = atoi (hostport);
-
+
if (!((local_port > 0) && (local_port < 65536)))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
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))
{
- const char *ip4addr = exit_argv[4];
+ 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))
{
- const char *ip6addr = exit_argv[2];
+ const char *ip6addr = exit_argv[3];
serv->address.af = AF_INET6;
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);
+ ret = getaddrinfo (hostname, NULL, NULL, &res);
if ( (ret != 0) || (res == NULL) )
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
GNUNET_free (serv);
continue;
}
-
+
serv->address.af = res->ai_family;
switch (res->ai_family)
{
}
+/**
+ * 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 tc scheduler context
+ */
+static void
+do_dht_put (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+
+/**
+ * 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)
+{
+ dht_put = NULL;
+ dht_task = GNUNET_SCHEDULER_add_delayed (DHT_PUT_FREQUENCY,
+ &do_dht_put,
+ NULL);
+}
+
+
+/**
+ * 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 tc scheduler context
+ */
+static void
+do_dht_put (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_TIME_Absolute expiration;
+
+ dht_task = GNUNET_SCHEDULER_NO_TASK;
+ 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)
+ {
+ /* 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_ecc_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,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ &dht_put_cont, NULL);
+}
+
+
/**
* @brief Main function that will be run by the scheduler.
*
{&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}
};
- static GNUNET_MESH_ApplicationType apptypes[] = {
+ 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 *policy;
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_;
- stats = GNUNET_STATISTICS_create ("exit", cfg);
ipv4_exit = GNUNET_CONFIGURATION_get_value_yesno (cfg, "exit", "EXIT_IPV4");
- ipv6_exit = GNUNET_CONFIGURATION_get_value_yesno (cfg, "exit", "EXIT_IPV6");
+ 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");
+ ipv6_enabled = GNUNET_CONFIGURATION_get_value_yesno (cfg, "exit", "ENABLE_IPV6");
+ 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, refusing to run\n"),
+ "gnunet-helper-exit");
+ global_ret = 1;
+ return;
+ }
+ GNUNET_free (binary);
+ }
+ stats = GNUNET_STATISTICS_create ("exit", cfg);
+
+ if ( (ipv4_exit || ipv4_enabled) &&
+ GNUNET_OK != GNUNET_NETWORK_test_pf (PF_INET))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("This system does not support IPv4, will disable IPv4 functions despite them being enabled in the configuration\n"));
+ ipv4_exit = GNUNET_NO;
+ ipv4_enabled = GNUNET_NO;
+ }
+ if ( (ipv6_exit || ipv6_enabled) &&
+ GNUNET_OK != GNUNET_NETWORK_test_pf (PF_INET6))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("This system does not support IPv6, will disable IPv6 functions despite them being enabled in the configuration\n"));
+ ipv6_exit = GNUNET_NO;
+ ipv6_enabled = GNUNET_NO;
+ }
if (ipv4_exit && (! ipv4_enabled))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("No useful service enabled. Exiting.\n"));
GNUNET_SCHEDULER_shutdown ();
- return;
+ 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);
+
+
app_idx = 0;
- if (GNUNET_YES == ipv4_exit)
+ 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)
+ 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)
+ {
+ dht = GNUNET_DHT_connect (cfg, 1);
+ peer_key = GNUNET_CRYPTO_ecc_key_create_from_configuration (cfg);
+ GNUNET_CRYPTO_ecc_key_get_public_for_signature (peer_key,
+ &dns_advertisement.peer.public_key);
+ dns_advertisement.purpose.size = htonl (sizeof (struct GNUNET_DNS_Advertisement) -
+ sizeof (struct GNUNET_CRYPTO_EccSignature));
+ 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);
+ apptypes[app_idx] = GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER;
+ app_idx++;
+ }
GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
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_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "EXIT", "TUN_IFNAME");
GNUNET_SCHEDULER_shutdown ();
return;
}
if (GNUNET_SYSERR ==
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_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "EXIT", "EXIT_IFNAME");
GNUNET_SCHEDULER_shutdown ();
return;
}
}
else
{
- exit_argv[2] = GNUNET_strdup ("%");
+ exit_argv[2] = GNUNET_strdup ("-");
}
+
+
if (GNUNET_YES == ipv6_enabled)
{
if ( (GNUNET_SYSERR ==
&ipv6addr) ||
(1 != inet_pton (AF_INET6, ipv6addr, &exit_ipv6addr))) )
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No valid entry 'IPV6ADDR' in configuration!\n");
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "EXIT", "IPV6ADDR");
GNUNET_SCHEDULER_shutdown ();
return;
}
GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV6PREFIX",
&ipv6prefix_s))
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No entry 'IPV6PREFIX' in configuration!\n");
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "EXIT", "IPV6PREFIX");
GNUNET_SCHEDULER_shutdown ();
return;
}
&ipv6prefix)) ||
(ipv6prefix >= 127) )
{
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, "EXIT", "IPV6PREFIX",
+ _("Must be a number"));
GNUNET_SCHEDULER_shutdown ();
return;
}
- }
+ }
else
{
/* IPv6 explicitly disabled */
&ipv4addr) ||
(1 != inet_pton (AF_INET, ipv4addr, &exit_ipv4addr))) )
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No valid entry for 'IPV4ADDR' in configuration!\n");
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "EXIT", "IPV4ADDR");
GNUNET_SCHEDULER_shutdown ();
return;
}
&ipv4mask) ||
(1 != inet_pton (AF_INET, ipv4mask, &exit_ipv4mask))) )
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No valid entry 'IPV4MASK' in configuration!\n");
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "EXIT", "IPV4MASK");
GNUNET_SCHEDULER_shutdown ();
return;
}
}
exit_argv[7] = NULL;
- udp_services = GNUNET_CONTAINER_multihashmap_create (65536);
- tcp_services = GNUNET_CONTAINER_multihashmap_create (65536);
+ 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);
+ 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, 42 /* queue size */, NULL,
- &new_tunnel,
+ mesh_handle
+ = GNUNET_MESH_connect (cfg, NULL,
+ &new_tunnel,
&clean_tunnel, handlers,
- apptypes);
+ apptypes); // FIXME use ports
if (NULL == mesh_handle)
{
GNUNET_SCHEDULER_shutdown ();
return;
}
- helper_handle = GNUNET_HELPER_start ("gnunet-helper-exit",
- exit_argv,
- &message_token, NULL);
+
+ /* Mesh handle acquired, now announce regular expressions matching our exit */
+ if ( (GNUNET_YES == ipv4_enabled) && (GNUNET_YES == ipv4_exit) )
+ {
+ policy = NULL;
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ "exit",
+ "EXIT_RANGE_IPV4_REGEX",
+ &policy))
+ regex = NULL;
+ else
+ regex = GNUNET_TUN_ipv4policy2regex (policy);
+ GNUNET_free_non_null (policy);
+ if (NULL != regex)
+ {
+ (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)
+ {
+ policy = NULL;
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_string (cfg,
+ "exit",
+ "EXIT_RANGE_IPV6_REGEX",
+ &policy))
+ regex = NULL;
+ else
+ regex = GNUNET_TUN_ipv6policy2regex (policy);
+ GNUNET_free_non_null (policy);
+ if (NULL != regex)
+ {
+ (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);
+ }
+ }
+ if ((ipv4_exit) || (ipv6_exit))
+ helper_handle = GNUNET_HELPER_start (GNUNET_NO,
+ "gnunet-helper-exit",
+ exit_argv,
+ &message_token,
+ NULL, NULL);
}
GNUNET_GETOPT_OPTION_END
};
+ 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)) ? 0 : 1;
+ options, &run, NULL)) ? global_ret : 1;
}
projects / oweals / gnunet.git / blobdiff