* @brief tool to allow IP traffic exit from the GNUnet mesh to the Internet
* @author Philipp Toelke
* @author Christian Grothoff
+ *
+ * TODO:
+ * - test
+ *
+ * Design:
+ * - 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
+ * service with an API to add local-exit services dynamically?
*/
-#include <platform.h>
-#include <gnunet_common.h>
-#include <gnunet_program_lib.h>
-#include <gnunet_protocols.h>
-#include <gnunet_applications.h>
-#include <gnunet_mesh_service.h>
-#include <gnunet_constants.h>
-#include <string.h>
-
-
-/* see http://www.iana.org/assignments/ethernet-numbers */
-#ifndef ETH_P_IPV4
-#define ETH_P_IPV4 0x0800
-#endif
-
-#ifndef ETH_P_IPV6
-#define ETH_P_IPV6 0x86DD
-#endif
-
-
-GNUNET_NETWORK_STRUCT_BEGIN
-/**
- * Header from Linux TUN interface.
- */
-struct tun_header
-{
- /**
- * Some flags (unused).
- */
- uint16_t flags;
-
- /**
- * Here we get an ETH_P_-number.
- */
- uint16_t proto;
-};
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_protocols.h"
+#include "gnunet_applications.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_tun_lib.h"
+#include "gnunet_regex_lib.h"
+#include "exit.h"
/**
- * Standard IPv4 header.
+ * Maximum path compression length for mesh regex announcing for IPv4 address
+ * based regex.
*/
-struct ip4_header
-{
- unsigned header_length:4 GNUNET_PACKED;
- unsigned version:4 GNUNET_PACKED;
- uint8_t diff_serv;
- uint16_t total_length GNUNET_PACKED;
- uint16_t identification GNUNET_PACKED;
- unsigned flags:3 GNUNET_PACKED;
- unsigned fragmentation_offset:13 GNUNET_PACKED;
- uint8_t ttl;
- uint8_t protocol;
- uint16_t checksum GNUNET_PACKED;
- struct in_addr source_address GNUNET_PACKED;
- struct in_addr destination_address GNUNET_PACKED;
-};
+#define REGEX_MAX_PATH_LEN_IPV4 4
/**
- * Standard IPv6 header.
+ * Maximum path compression length for mesh regex announcing for IPv6 address
+ * based regex.
*/
-struct ip6_header
-{
- unsigned traffic_class_h:4 GNUNET_PACKED;
- unsigned version:4 GNUNET_PACKED;
- unsigned traffic_class_l:4 GNUNET_PACKED;
- unsigned flow_label:20 GNUNET_PACKED;
- uint16_t payload_length GNUNET_PACKED;
- uint8_t next_header;
- uint8_t hop_limit;
- struct in6_addr source_address GNUNET_PACKED;
- struct in6_addr destination_address GNUNET_PACKED;
-};
-
-#define TCP_FLAG_SYN 2
+#define REGEX_MAX_PATH_LEN_IPV6 8
-struct tcp_packet
-{
- unsigned spt:16 GNUNET_PACKED;
- unsigned dpt:16 GNUNET_PACKED;
- unsigned seq:32 GNUNET_PACKED;
- unsigned ack:32 GNUNET_PACKED;
- unsigned off:4 GNUNET_PACKED;
- unsigned rsv:4 GNUNET_PACKED;
- unsigned flg:8 GNUNET_PACKED;
- unsigned wsz:16 GNUNET_PACKED;
- unsigned crc:16 GNUNET_PACKED;
- unsigned urg:16 GNUNET_PACKED;
-};
/**
- * UDP packet header.
+ * Generic logging shorthand
*/
-struct udp_packet
-{
- uint16_t spt GNUNET_PACKED;
- uint16_t dpt GNUNET_PACKED;
- uint16_t len GNUNET_PACKED;
- uint16_t crc GNUNET_PACKED;
-};
+#define LOG(kind, ...) \
+ GNUNET_log_from (kind, "exit", __VA_ARGS__);
+
-/**
- * DNS header.
- */
-struct dns_header
-{
- uint16_t id GNUNET_PACKED;
- uint16_t flags GNUNET_PACKED;
- uint16_t qdcount GNUNET_PACKED;
- uint16_t ancount GNUNET_PACKED;
- uint16_t nscount GNUNET_PACKED;
- uint16_t arcount GNUNET_PACKED;
-};
-GNUNET_NETWORK_STRUCT_END
/**
- * Information about a remote address.
+ * Information about an address.
*/
-struct remote_addr
+struct SocketAddress
{
/**
* AF_INET or AF_INET6.
*/
struct in6_addr ipv6;
} address;
-
- /**
- * Remote port, in host byte order!
- */
- uint16_t port;
/**
* IPPROTO_TCP or IPPROTO_UDP;
*/
uint8_t proto;
+ /**
+ * Remote port, in host byte order!
+ */
+ uint16_t port;
+
};
/**
- * This struct is saved into the services-hashmap
+ * This struct is saved into the services-hashmap to represent
+ * a service this peer is specifically offering an exit for
+ * (for a specific domain name).
*/
-struct redirect_service
+struct LocalService
{
/**
* Remote address to use for the service.
*/
- struct remote_addr address;
+ struct SocketAddress address;
/**
- * Descriptor for this service (also key of this entry in the service hash map).
+ * DNS name of the service.
*/
- GNUNET_HashCode desc;
+ char *name;
/**
- * Port I am listening on within GNUnet for this service, in host byte order.
+ * Port I am listening on within GNUnet for this service, in host
+ * byte order. (as we may redirect ports).
*/
uint16_t my_port;
};
/**
- * Information we use to track a connection.
+ * 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 redirect_info
+struct RedirectInformation
{
/**
- * Address information for the other party.
+ * Address information for the other party (equivalent of the
+ * arguments one would give to "connect").
*/
- struct remote_addr remote_address;
+ struct SocketAddress remote_address;
/**
- * The source-port of this connection, in host byte order
+ * Address information we used locally (AF and proto must match
+ * "remote_address"). Equivalent of the arguments one would give to
+ * "bind".
*/
- uint16_t source_port;
+ 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
+
+ Note 2: we might also sometimes not match on all components
+ of the tuple, to support protocols where things do not always
+ fully map.
+ */
};
+
/**
- * This struct is saved into {tcp,udp}_connections;
+ * Queue of messages to a tunnel.
*/
-struct redirect_state
+struct TunnelMessageQueue
{
/**
- * Mesh tunnel that is used for this connection.
- */
- struct GNUNET_MESH_Tunnel *tunnel;
-
- /**
- * Heap node for this state in the connections_heap.
+ * This is a doubly-linked list.
*/
- struct GNUNET_CONTAINER_HeapNode *heap_node;
+ struct TunnelMessageQueue *next;
/**
- * Key this state has in the connections_map.
+ * This is a doubly-linked list.
*/
- GNUNET_HashCode state_key;
+ struct TunnelMessageQueue *prev;
/**
- * Associated service record, or NULL for no service.
+ * Payload to send via the tunnel.
*/
- struct redirect_service *serv;
+ const void *payload;
/**
- * Source port we use for this connection. FIXME: needed? used?
+ * Number of bytes in 'payload'.
*/
- uint16_t source_port__;
-
+ size_t len;
};
+
/**
- * Queue of messages to a tunnel.
+ * 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.
*/
-struct tunnel_notify_queue
+struct TunnelState
{
/**
- * This is a doubly-linked list.
+ * Mesh tunnel that is used for this connection.
*/
- struct tunnel_notify_queue *next;
+ struct GNUNET_MESH_Tunnel *tunnel;
/**
- * This is a doubly-linked list.
+ * Active tunnel transmission request (or NULL).
*/
- struct tunnel_notify_queue *prev;
+ struct GNUNET_MESH_TransmitHandle *th;
/**
- * Payload to send via the tunnel.
+ * 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.
*/
- const void *payload;
+ int is_dns;
+
+ union
+ {
+ struct
+ {
+
+ /**
+ * 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
+ {
+
+ /**
+ * 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;
- /**
- * Number of bytes in 'cls'.
- */
- size_t len;
};
/**
- * Information we track per mesh tunnel.
+ * Return value from 'main'.
*/
-struct tunnel_state
-{
- struct tunnel_notify_queue *head;
- struct tunnel_notify_queue *tail;
- struct GNUNET_MESH_TransmitHandle *th;
- struct GNUNET_MESH_Tunnel *tunnel;
-};
-
+static int global_ret;
/**
* 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 in6_addr exit_ipv6addr;
/**
* IPv6 prefix (0..127) from configuration file.
static unsigned long long ipv6prefix;
/**
- * Final status code.
+ * IPv4 address of our TUN interface.
+ */
+static struct in_addr exit_ipv4addr;
+
+/**
+ * IPv4 netmask of our TUN interface.
+ */
+static struct in_addr exit_ipv4mask;
+
+/**
+ * Statistics.
*/
-static int ret;
+static struct GNUNET_STATISTICS_Handle *stats;
/**
* The handle to mesh
/**
* This hashmaps contains the mapping from peer, service-descriptor,
- * source-port and destination-port to a struct redirect_state
+ * source-port and destination-port to a struct TunnelState
*/
static struct GNUNET_CONTAINER_MultiHashMap *connections_map;
/**
* If there are at least this many connections, old ones will be removed
*/
-static long long unsigned int max_connections = 200;
+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;
+
+/**
+ * Are we an IPv4-exit?
+ */
+static int ipv4_exit;
+
+/**
+ * Are we an IPv6-exit?
+ */
+static int ipv6_exit;
+
+/**
+ * Do we support IPv4 at all on the TUN interface?
+ */
+static int ipv4_enabled;
+
+/**
+ * Do we support IPv6 at all on the TUN interface?
+ */
+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,
+ NULL,
+ 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 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_dns_request (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)
+{
+ 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
* @param ri information about the connection
*/
static void
-hash_redirect_info (GNUNET_HashCode * hash,
- const struct redirect_info *ri)
+hash_redirect_info (struct GNUNET_HashCode *hash,
+ const struct RedirectInformation *ri)
{
char *off;
- memset (hash, 0, sizeof (GNUNET_HashCode));
- /* the GNUnet hashmap only uses the first sizeof(unsigned int) of the hash */
+ 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)
{
GNUNET_assert (0);
}
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));
+ off += sizeof (struct in_addr);
+ break;
+ case AF_INET6:
+ 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));
+ off += sizeof (uint16_t);
memcpy (off, &ri->remote_address.proto, sizeof (uint8_t));
- memcpy (off, &ri->source_port, sizeof (uint8_t));
+ off += sizeof (uint8_t);
+}
+
+
+/**
+ * Get our connection tracking state. Warns if it does not exists,
+ * refreshes the timestamp if it does exist.
+ *
+ * @param af address family
+ * @param protocol IPPROTO_UDP or IPPROTO_TCP
+ * @param destination_ip target IP
+ * @param destination_port target port
+ * @param local_ip local IP
+ * @param local_port local port
+ * @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 *
+get_redirect_state (int af,
+ int protocol,
+ const void *destination_ip,
+ uint16_t destination_port,
+ const void *local_ip,
+ uint16_t local_port,
+ struct GNUNET_HashCode *state_key)
+{
+ struct RedirectInformation ri;
+ 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);
+ else
+ ri.remote_address.address.ipv6 = * ((struct in6_addr*) destination_ip);
+ ri.remote_address.port = destination_port;
+ ri.remote_address.proto = protocol;
+ ri.local_address.af = af;
+ if (af == AF_INET)
+ ri.local_address.address.ipv4 = *((struct in_addr*) local_ip);
+ else
+ 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);
+ if (NULL != state_key)
+ *state_key = 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);
+ 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 redirect_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 redirect_service *service = value;
+ struct LocalService *service = value;
+ GNUNET_free_non_null (service->name);
GNUNET_free (service);
return GNUNET_OK;
}
*
* @param service_map map of services (TCP or UDP)
* @param name name of the service
- * @param dpt destination port
- * @param service service information record to store (service->desc will be set).
+ * @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,
- struct redirect_service *service)
+ 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->desc = desc;
- memcpy (&key[0], &dpt, sizeof (uint16_t));
- memcpy (&key[sizeof(uint16_t)], &desc, sizeof (GNUNET_HashCode));
+ 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,
- (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);
}
}
/**
* MESH is ready to receive a message for the tunnel. Transmit it.
*
- * @param cls the 'struct tunnel_state'.
+ * @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 tunnel_state *s = cls;
+ struct TunnelState *s = cls;
struct GNUNET_MESH_Tunnel *tunnel = s->tunnel;
- struct tunnel_notify_queue *tnq;
+ 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,
+ NULL,
+ 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,
+ GNUNET_CONTAINER_DLL_remove (s->specifics.tcp_udp.head,
+ s->specifics.tcp_udp.tail,
tnq);
GNUNET_free (tnq);
- if (NULL != (tnq = s->head))
+ if (NULL != (tnq = s->specifics.tcp_udp.head))
s->th = GNUNET_MESH_notify_transmit_ready (tunnel,
GNUNET_NO /* corking */,
- 0 /* priority */,
GNUNET_TIME_UNIT_FOREVER_REL,
NULL,
tnq->len,
&send_to_peer_notify_callback,
s);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# Bytes transmitted via mesh tunnels"),
+ size, GNUNET_NO);
return size;
}
* Send the given packet via the mesh tunnel.
*
* @param mesh_tunnel destination
- * @param payload message to transmit
- * @param payload_length number of bytes in payload
- * @param desc descriptor to add
- * @param mtype message type to use
+ * @param tnq message to queue
*/
static void
send_packet_to_mesh_tunnel (struct GNUNET_MESH_Tunnel *mesh_tunnel,
- const void *payload,
- size_t payload_length,
- const GNUNET_HashCode *desc,
- uint16_t mtype)
+ struct TunnelMessageQueue *tnq)
{
- struct tunnel_state *s;
- struct tunnel_notify_queue *tnq;
- struct GNUNET_MessageHeader *msg;
- size_t len;
- GNUNET_HashCode *dp;
+ struct TunnelState *s;
- len = sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) + payload_length;
- if (len >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
- {
- GNUNET_break (0);
- return;
- }
- tnq = GNUNET_malloc (sizeof (struct tunnel_notify_queue) + len);
- tnq->payload = &tnq[1];
- tnq->len = len;
- msg = (struct GNUNET_MessageHeader *) &tnq[1];
- msg->size = htons ((uint16_t) len);
- msg->type = htons (mtype);
- dp = (GNUNET_HashCode *) &msg[1];
- *dp = *desc;
- memcpy (&dp[1], payload, payload_length);
s = GNUNET_MESH_tunnel_get_data (mesh_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, len,
+ NULL, tnq->len,
&send_to_peer_notify_callback,
s);
}
/**
- * Get our connection tracking state. Warns if it does not exists,
- * refreshes the timestamp if it does exist.
+ * @brief Handles an ICMP packet received from the helper.
*
- * @param af address family
- * @param protocol IPPROTO_UDP or IPPROTO_TCP
- * @param destination_ip target IP
- * @param destination_port target port
- * @param source_port source port
- * @return NULL if we have no tracking information for this tuple
+ * @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)
*/
-static struct redirect_state *
-get_redirect_state (int af,
- int protocol,
- const void *destination_ip,
- uint16_t destination_port,
- uint16_t source_port)
+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 redirect_info ri;
- GNUNET_HashCode state_key;
- struct redirect_state *state;
-
- ri.remote_address.af = af;
- if (af == AF_INET)
- ri.remote_address.address.ipv4 = *((struct in_addr*) destination_ip);
- else
- ri.remote_address.address.ipv6 = * ((struct in6_addr*) destination_ip);
- ri.remote_address.port = destination_port;
- ri.remote_address.proto = IPPROTO_UDP;
- ri.source_port = source_port;
+ 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;
- hash_redirect_info (&state_key, &ri);
- state = GNUNET_CONTAINER_multihashmap_get (connections_map, &state_key);
- if (NULL == state)
{
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("Packet dropped, have no matching connection information\n"));
- return NULL;
+ 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)));
}
- /* Mark this connection as freshly used */
- GNUNET_CONTAINER_heap_update_cost (connections_heap,
- state->heap_node,
- GNUNET_TIME_absolute_get ().abs_value);
- return state;
-}
+ if (pktlen < sizeof (struct GNUNET_TUN_IcmpHeader))
+ {
+ /* 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);
+ }
+ 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;
+ }
+ 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->tunnel,
+ tnq);
+}
/**
*
* @param udp A pointer to the Packet
* @param pktlen number of bytes in 'udp'
- * @param destination_ip destination IP-address
* @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 udp_packet *udp,
+udp_from_helper (const struct GNUNET_TUN_UdpHeader *udp,
size_t pktlen,
- const void *destination_ip, int af)
+ int af,
+ const void *destination_ip,
+ const void *source_ip)
{
- struct redirect_state *state;
- struct GNUNET_MESH_Tunnel *tunnel;
- GNUNET_HashCode desc;
+ struct TunnelState *state;
+ struct TunnelMessageQueue *tnq;
+ struct GNUNET_EXIT_UdpReplyMessage *urm;
+ size_t mlen;
- if (pktlen < sizeof (struct udp_packet))
+ {
+ 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;
}
state = get_redirect_state (af, IPPROTO_UDP,
+ source_ip,
+ ntohs (udp->source_port),
destination_ip,
- ntohs (udp->dpt),
- ntohs (udp->spt));
+ ntohs (udp->destination_port),
+ NULL);
if (NULL == state)
- return;
- tunnel = state->tunnel;
-
- // FIXME...
-#if 0
- if (state->type == SERVICE)
{
- /* check if spt == serv.remote if yes: set spt = serv.myport ("nat") */
- if (ntohs (udp->spt) == state->serv->remote_port)
- {
- udp->spt = htons (state->serv->my_port);
- }
- else
- {
- /* otherwise the answer came from a different port (tftp does this)
- * add this new port to the list of all services, so that the packets
- * coming back from the client to this new port will be routed correctly
- */
- struct redirect_service *serv =
- GNUNET_malloc (sizeof (struct redirect_service));
- memcpy (serv, state->serv, sizeof (struct redirect_service));
- serv->my_port = ntohs (udp->spt);
- serv->remote_port = ntohs (udp->spt);
- uint16_t *desc = alloca (sizeof (GNUNET_HashCode) + 2);
-
- memcpy ((GNUNET_HashCode *) (desc + 1), &state->desc,
- sizeof (GNUNET_HashCode));
- *desc = ntohs (udp->spt);
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CONTAINER_multihashmap_put (udp_services,
- (GNUNET_HashCode *)
- desc, serv,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
-
- state->serv = serv;
- }
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ _("UDP Packet dropped, have no matching connection information\n"));
+ return;
}
-
- if (state->type == SERVICE)
- memcpy (&desc, &state->desc, sizeof (GNUNET_HashCode));
- else
- memcpy (&desc, &state->remote, sizeof (struct remote_addr));
-#else
- memset (&desc, 0, sizeof (desc));
-#endif
-
- /* send udp-packet back */
- send_packet_to_mesh_tunnel (tunnel,
- udp, pktlen,
- &desc,
- state->serv != NULL
- ? GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP_BACK
- : GNUNET_MESSAGE_TYPE_VPN_REMOTE_UDP_BACK);
+ 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->tunnel,
+ tnq);
}
* @brief Handles a TCP packet received from the helper.
*
* @param tcp A pointer to the Packet
- * @param pktlen the length of the packet, including its header
- * @param destination_ip destination IP-address
+ * @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 void
-tcp_from_helper (const struct tcp_packet *tcp,
+tcp_from_helper (const struct GNUNET_TUN_TcpHeader *tcp,
size_t pktlen,
- const void *destination_ip, int af)
+ int af,
+ const void *destination_ip,
+ const void *source_ip)
{
- struct redirect_state *state;
- struct GNUNET_MESH_Tunnel *tunnel;
- GNUNET_HashCode desc;
+ struct TunnelState *state;
+ char buf[pktlen] GNUNET_ALIGN;
+ struct GNUNET_TUN_TcpHeader *mtcp;
+ struct GNUNET_EXIT_TcpDataMessage *tdm;
+ struct TunnelMessageQueue *tnq;
+ size_t mlen;
- if (pktlen < sizeof (struct tcp_packet))
+ {
+ 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 */
GNUNET_break (0);
return;
}
state = get_redirect_state (af, IPPROTO_TCP,
- destination_ip,
- ntohs (tcp->dpt),
- ntohs (tcp->spt));
+ 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;
- tunnel = state->tunnel;
-
- // FIXME...
-#if 0
- if (state->type == SERVICE)
+ }
+ /* 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)
{
- /* check if spt == serv.remote if yes: set spt = serv.myport ("nat") */
- if (ntohs (tcp->spt) == state->serv->remote_port)
- {
- tcp->spt = htons (state->serv->my_port);
- }
- else
- {
- // This is an illegal packet.
- return;
- }
+ GNUNET_break (0);
+ return;
}
- /* send tcp-packet back */
- if (state->type == SERVICE)
- memcpy (&desc, &state->desc, sizeof (GNUNET_HashCode));
- else
- memcpy (&desc, &state->remote, sizeof (struct remote_addr));
-#else
- memset (&desc, 0, sizeof (desc));
-#endif
-
-
- send_packet_to_mesh_tunnel (tunnel,
- tcp, pktlen,
- &desc,
- state->serv != NULL
- ? GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP_BACK
- : GNUNET_MESSAGE_TYPE_VPN_REMOTE_TCP_BACK);
+ 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->tunnel,
+ 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)
{
- const struct tun_header *pkt_tun;
+ 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;
+ return GNUNET_OK;
}
size = ntohs (message->size);
- if (size < sizeof (struct tun_header) + sizeof (struct GNUNET_MessageHeader))
+ if (size < sizeof (struct GNUNET_TUN_Layer2PacketHeader) + sizeof (struct GNUNET_MessageHeader))
{
GNUNET_break (0);
- return;
+ return GNUNET_OK;
}
- pkt_tun = (const struct tun_header *) &message[1];
- size -= sizeof (struct tun_header) + sizeof (struct GNUNET_MessageHeader);
+ 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))
{
- case ETH_P_IPV6:
+ case ETH_P_IPV4:
{
- const struct ip6_header *pkt6;
+ const struct GNUNET_TUN_IPv4Header *pkt4;
- if (size < sizeof (struct ip6_header))
+ if (size < sizeof (struct GNUNET_TUN_IPv4Header))
{
/* Kernel to blame? */
GNUNET_break (0);
- return;
+ return GNUNET_OK;
}
- pkt6 = (struct ip6_header *) &pkt_tun[1];
- if (size != ntohs (pkt6->payload_length))
+ 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;
}
- size -= sizeof (struct ip6_header);
- switch (pkt6->next_header)
+ 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 udp_packet *) &pkt6[1], size,
- &pkt6->destination_address,
- AF_INET6);
+ 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 tcp_packet *) &pkt6[1], size,
- &pkt6->destination_address,
- AF_INET6);
+ 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,
- _("IPv6 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;
- case ETH_P_IPV4:
+ case ETH_P_IPV6:
{
- const struct ip4_header *pkt4;
+ const struct GNUNET_TUN_IPv6Header *pkt6;
- if (size < sizeof (struct ip4_header))
+ if (size < sizeof (struct GNUNET_TUN_IPv6Header))
{
/* Kernel to blame? */
GNUNET_break (0);
- return;
+ return GNUNET_OK;
}
- pkt4 = (const struct ip4_header *) &pkt_tun[1];
- if (size != ntohs (pkt4->total_length))
+ 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;
- }
- if (pkt4->header_length * 4 != sizeof (struct ip4_header))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("IPv4 packet options received. Ignored.\n"));
- return;
+ return GNUNET_OK;
}
- size -= sizeof (struct ip4_header);
- switch (pkt4->protocol)
+ size -= sizeof (struct GNUNET_TUN_IPv6Header);
+ switch (pkt6->next_header)
{
case IPPROTO_UDP:
- udp_from_helper ((const struct udp_packet *) &pkt4[1], size,
- &pkt4->destination_address, AF_INET);
+ 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 tcp_packet *) &pkt4[1], size,
- &pkt4->destination_address, AF_INET);
+ 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,
- _("IPv4 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;
}
-
-
+/**
+ * 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
-prepare_ipv4_packet (size_t len, uint16_t pktlen, void *payload,
- uint8_t protocol, void *ipaddress, void *tunnel,
- struct redirect_info *state, struct ip4_header *pkt4)
+setup_fresh_address (int af,
+ uint8_t proto,
+ struct SocketAddress *local_address)
{
- const char *ipv4addr = exit_argv[4];
- const char *ipv4mask = exit_argv[5];
- uint32_t tmp;
- uint32_t tmp2;
-
- GNUNET_assert (1 == inet_pton (AF_INET, ipv4addr, &tmp));
- GNUNET_assert (1 == inet_pton (AF_INET, ipv4mask, &tmp2));
- memcpy (&pkt4[1], payload, pktlen);
- pkt4->version = 4;
- pkt4->header_length = sizeof (struct ip4_header) / 4;
- pkt4->diff_serv = 0;
- pkt4->total_length = htons (sizeof (struct ip4_header) + pktlen);
- pkt4->identification = 0; // FIXME!
- pkt4->flags = 0;
- pkt4->fragmentation_offset = 0;
- pkt4->ttl = 255;
- pkt4->protocol = protocol;
- pkt4->checksum = 0; /* Will be calculated later */
-
- memcpy (&pkt4->destination_address, ipaddress, sizeof (struct in_addr));
-
- /* Generate a new src-address -- FIXME: not always, right!? */
-
- /* This should be a noop */
- tmp = tmp & tmp2;
- tmp |= ntohl (*((uint32_t *) tunnel)) & (~tmp2);
-
- pkt4->source_address.s_addr = tmp;
- pkt4->checksum = GNUNET_CRYPTO_crc16_n (pkt4, sizeof (struct ip4_header));
-
- // FIXME: memcpy (&state->addr, &tmp, 4);
-
- switch (protocol)
+ 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 IPPROTO_UDP:
+ case AF_INET:
{
- struct udp_packet *pkt4_udp = (struct udp_packet *) &pkt4[1];
- // FIXME: state->pt = pkt4_udp->spt;
- pkt4_udp->crc = 0; /* Optional for IPv4 */
+ struct in_addr addr;
+ struct in_addr mask;
+ struct in_addr rnd;
+
+ 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
+ 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);
+ 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) ||
+ (local_address->address.ipv4.s_addr == mask.s_addr) );
}
break;
- case IPPROTO_TCP:
+ case AF_INET6:
{
- struct tcp_packet *pkt4_tcp = (struct tcp_packet *) &pkt4[1];
+ struct in6_addr addr;
+ struct in6_addr mask;
+ struct in6_addr rnd;
+ int i;
+
+ addr = exit_ipv6addr;
+ GNUNET_assert (ipv6prefix < 128);
+ if (ipv6prefix == 127)
+ {
+ /* only one valid IP anyway */
+ local_address->address.ipv6 = addr;
+ return;
+ }
+ /* Given ABCD::/96, we want a mask of 'ABCD::FFFF:FFFF,
+ thus: */
+ mask = addr;
+ for (i=127;i>=ipv6prefix;i--)
+ mask.s6_addr[i / 8] |= (1 << (i % 8));
- // FIXME: state->pt = pkt4_tcp->spt;
- pkt4_tcp->crc = 0;
- uint32_t sum = 0;
- sum = GNUNET_CRYPTO_crc16_step (sum,
- &pkt4->source_address,
- sizeof (struct in_addr) * 2);
- tmp = (protocol << 16) | (0xffff & pktlen);
- tmp = htonl (tmp);
- sum = GNUNET_CRYPTO_crc16_step (sum, & tmp, 4);
- sum = GNUNET_CRYPTO_crc16_step (sum, & pkt4_tcp, pktlen);
- pkt4_tcp->crc = GNUNET_CRYPTO_crc16_finish (sum);
+ /* 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,
+ 256);
+ local_address->address.ipv6.s6_addr[i]
+ = (addr.s6_addr[i] | rnd.s6_addr[i]) & mask.s6_addr[i];
+ }
+ }
+ while ( (0 == memcmp (&local_address->address.ipv6,
+ &addr,
+ sizeof (struct in6_addr))) ||
+ (0 == memcmp (&local_address->address.ipv6,
+ &mask,
+ sizeof (struct in6_addr))) );
}
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
+ * 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'
+ * to allow finding the state when needed later. The function
+ * also makes sure that we remain within memory limits by
+ * cleaning up 'old' states.
+ *
+ * @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
+ * 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
-prepare_ipv6_packet (size_t len, uint16_t pktlen, void *payload,
- uint16_t protocol, void *ipaddress, void *tunnel,
- struct redirect_info *state, struct ip6_header *pkt6)
+setup_state_record (struct TunnelState *state)
{
- const char *ipv6addr = exit_argv[2];
- uint32_t tmp;
-
+ struct GNUNET_HashCode key;
+ struct TunnelState *s;
- memcpy (&pkt6[1], payload, pktlen);
-
- pkt6->version = 6;
- pkt6->next_header = protocol;
- pkt6->payload_length = htons (pktlen);
- pkt6->hop_limit = 64;
+ /* generate fresh, unique address */
+ do
+ {
+ 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->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->specifics.tcp_udp.ri.local_address.af,
+ &state->specifics.tcp_udp.ri.local_address.address,
+ 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,
+ &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);
+ 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_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_remove (connections_map,
+ &s->specifics.tcp_udp.state_key,
+ s));
+ GNUNET_free (s);
+ }
+}
- memcpy (&pkt6->destination_address, ipaddress, sizeof (struct in6_addr));
- /* Generate a new src-address
- * This takes as much from the address of the tunnel as fits into
- * the host-mask*/
+/**
+ * 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 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
+ */
+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)
+{
+ size_t len;
- unsigned long long ipv6prefix_r = (ipv6prefix + 7) / 8;
+ len = payload_length;
+ switch (protocol)
+ {
+ 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;
+ }
- inet_pton (AF_INET6, ipv6addr, &pkt6->source_address);
+ 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);
+ memcpy (&pkt4_udp[1], payload, payload_length);
+ }
+ break;
+ case IPPROTO_TCP:
+ {
+ 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);
+ }
+ break;
+ default:
+ GNUNET_assert (0);
+ }
+}
- if (ipv6prefix_r < (16 - sizeof (void *)))
- ipv6prefix_r = 16 - sizeof (void *);
- unsigned int offset = ipv6prefix_r - (16 - sizeof (void *));
+/**
+ * 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 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;
- memcpy ((((char *) &pkt6->source_address)) + ipv6prefix_r,
- ((char *) &tunnel) + offset, 16 - ipv6prefix_r);
+ 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;
+ }
- /* copy the needed information into the state */
- // FIXME: memcpy (&state->addr, &pkt6->source_address, 16);
+ GNUNET_TUN_initialize_ipv6_header (pkt6,
+ protocol,
+ len,
+ &src_address->address.ipv6,
+ &dst_address->address.ipv6);
switch (protocol)
{
case IPPROTO_UDP:
{
- struct udp_packet *pkt6_udp = (struct udp_packet *) &pkt6[1];
-
- // FIXME: state->pt = pkt6_udp->spt;
- pkt6_udp->crc = 0;
- uint32_t sum = 0;
- sum =
- GNUNET_CRYPTO_crc16_step (sum, & pkt6->source_address,
- 16 * 2);
- tmp = (htons (pktlen) & 0xffff);
- sum = GNUNET_CRYPTO_crc16_step (sum, & tmp, 4);
- tmp = htons (pkt6->next_header & 0x00ff);
- sum = GNUNET_CRYPTO_crc16_step (sum, & tmp, 4);
- sum =
- GNUNET_CRYPTO_crc16_step (sum, pkt6_udp,
- ntohs (pkt6_udp->len));
- pkt6_udp->crc = GNUNET_CRYPTO_crc16_finish (sum);
+ 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 tcp_packet *pkt6_tcp = (struct tcp_packet *) pkt6;
-
- // FIXME: state->pt = pkt6_tcp->spt;
- pkt6_tcp->crc = 0;
- uint32_t sum = 0;
-
- sum =
- GNUNET_CRYPTO_crc16_step (sum, & pkt6->source_address, 16 * 2);
- tmp = htonl (pktlen);
- sum = GNUNET_CRYPTO_crc16_step (sum, & tmp, 4);
- tmp = htonl (((pkt6->next_header & 0x000000ff)));
- sum = GNUNET_CRYPTO_crc16_step (sum, & tmp, 4);
-
- sum =
- GNUNET_CRYPTO_crc16_step (sum, pkt6_tcp,
- ntohs (pkt6->payload_length));
- pkt6_tcp->crc = GNUNET_CRYPTO_crc16_finish (sum);
+ 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:
/**
- * We've just experienced a connection in use. Track it, or if it is
- * already tracked, update the tracking.
+ * Send a TCP packet via the TUN interface.
*
- * @param u_i IP-level connection tracking state
- * @param tunnel associated mesh tunnel
- * @param desc service descriptor (or NULL)
- * @param serv service information
+ * @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
-update_state_map (const struct redirect_info *ri,
- struct GNUNET_MESH_Tunnel *tunnel,
- const GNUNET_HashCode *desc,
- struct redirect_service *serv)
+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 redirect_state *state;
- GNUNET_HashCode state_key;
+ size_t len;
- hash_redirect_info (&state_key,
- ri);
- state = GNUNET_CONTAINER_multihashmap_get (connections_map, &state_key);
- if (NULL == state)
+ 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)
{
- state = GNUNET_malloc (sizeof (struct redirect_state));
- state->tunnel = tunnel;
- state->state_key = state_key;
- state->serv = serv;
- // FIXME? if (NULL != desc) state->desc = *desc;
- // FIXME? state->redirect_info = *ri;
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CONTAINER_multihashmap_put (connections_map, &state_key, state,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- state->heap_node =
- GNUNET_CONTAINER_heap_insert (connections_heap,
- state,
- GNUNET_TIME_absolute_get ().abs_value);
+ 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;
}
- else
+ len += sizeof (struct GNUNET_TUN_TcpHeader);
+ len += payload_length;
+ if (len >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
{
- if (state->tunnel != tunnel)
- {
- /* Stats / warning: two tunnels got exactly the same connection state!? */
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Two different mesh tunnels got the same connection state. Oops.\n"));
- return;
- }
- GNUNET_CONTAINER_heap_update_cost (connections_heap,
- state->heap_node,
- GNUNET_TIME_absolute_get ().abs_value);
+ GNUNET_break (0);
+ return;
}
- while (GNUNET_CONTAINER_heap_get_size (connections_heap) > max_connections)
{
- state = GNUNET_CONTAINER_heap_remove_root (connections_heap);
- state->heap_node = NULL;
- GNUNET_MESH_tunnel_destroy (state->tunnel);
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CONTAINER_multihashmap_remove (connections_map,
- &state->state_key,
- state));
- GNUNET_free (state);
+ 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);
}
}
-
-
/**
- * The messages are one GNUNET_HashCode for the service followed by a struct tcp_packet
+ * 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 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)
{
-#if 0
- const GNUNET_HashCode *desc = (const GNUNET_HashCode *) &message[1];
- const struct tcp_packet *pkt = (const struct tcp_packet *) &desc[1];
- uint16_t pkt_len = ntohs (message->size);
- struct redirect_service *serv;
- struct redirect_info u_i;
- GNUNET_HashCode state_key;
+ struct TunnelState *state = *tunnel_ctx;
+ const struct GNUNET_EXIT_TcpServiceStartMessage *start;
+ 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 ("# 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) ||
+ (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 (sender),
+ 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;
+}
+
+
+/**
+ * Process 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 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)
+{
+ struct TunnelState *state = *tunnel_ctx;
+ const struct GNUNET_EXIT_TcpInternetStartMessage *start;
+ uint16_t pkt_len = ntohs (message->size);
+ const struct in_addr *v4;
+ const struct in6_addr *v6;
+ 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);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# TCP IP-exit creation requests received via mesh"),
+ 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) ||
+ (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->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;
+ }
+ if (! ipv4_exit)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ 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 GNUNET_SYSERR;
+ }
+ if (! ipv6_exit)
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ 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;
+ }
+ {
+ 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->specifics.tcp_udp.ri.remote_address.address,
+ buf, sizeof (buf)),
+ (unsigned int) ntohs (start->tcp_header.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);
+ 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;
+}
+
+
+/**
+ * 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)
+{
+ 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);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# TCP data requests received via mesh"),
+ 1, GNUNET_NO);
+ if (pkt_len < sizeof (struct GNUNET_EXIT_TcpDataMessage))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ data = (const struct GNUNET_EXIT_TcpDataMessage*) message;
+ pkt_len -= sizeof (struct GNUNET_EXIT_TcpDataMessage);
+ if ( (NULL == state) ||
+ (NULL == state->specifics.tcp_udp.heap_node) )
+ {
+ /* connection should have been up! */
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# TCP DATA requests dropped (no session)"),
+ 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->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);
+ }
+
+ 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;
+}
+
+
+/**
+ * Send an ICMP packet via the TUN interface.
+ *
+ * @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
+ */
+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)
+{
+ 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);
+ }
+}
+
+
+/**
+ * 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)
+{
+ 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 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);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMP IP-exit requests received via mesh"),
+ 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 */
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+
+ 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;
+ 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))
+ {
+ 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;
+ 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->specifics.tcp_udp.ri.remote_address.address,
+ buf, sizeof (buf)));
+ }
+ 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)
+{
+ 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);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# ICMP service requests received via mesh"),
+ 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 (sender),
+ 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;
+ }
+ 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)
+ {
+ 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;
+ }
+
+ 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;
+}
+
+
+/**
+ * Send a UDP packet via the TUN interface.
+ *
+ * @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
+ */
+static void
+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;
- /* check that we got at least a valid header */
- if (pkt_len < sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) + sizeof (struct tcp_packet))
+ 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)
{
- GNUNET_break_op (0);
- return GNUNET_YES;
+ 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;
}
- pkt_len -= (sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode));
-
- if (NULL == (serv = find_service (tcp_services, desc, ntohs (pkt->dpt))))
+ len += sizeof (struct GNUNET_TUN_UdpHeader);
+ len += payload_length;
+ if (len >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
{
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("No service found for %s on port %d!\n"),
- "TCP",
- ntohs (pkt->dpt));
- return GNUNET_YES;
+ GNUNET_break (0);
+ return;
}
- pkt->dpt = htons (serv->remote_port);
-
- /* At this point it would be possible to check against some kind of ACL. */
-
- switch (serv->version)
+ {
+ 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 4:
+ case AF_INET:
{
- size_t len =
- sizeof (struct GNUNET_MessageHeader) + sizeof (struct tun_header) +
- sizeof (struct ip4_header) + pkt_len;
- char buf[len];
- struct tun_header *hdr;
- struct GNUNET_MessageHeader *mhdr;
+ struct GNUNET_TUN_IPv4Header * ipv4 = (struct GNUNET_TUN_IPv4Header*) &tun[1];
- memset (buf, 0, len);
- mhdr = (struct GNUNET_MessageHeader*) buf;
- hdr = (struct tun_header *) &mhdr[1];
- mhdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
- mhdr->size = htons (len);
- hdr->flags = 0;
- hdr->proto = htons (0x0800);
- prepare_ipv4_packet (len, pkt_len, pkt, IPPROTO_TCP, &serv->v4.ip4address,
- tunnel, &u_i, (struct ip4_header *) &hdr[1]);
- /* FIXME: here, flow-control with mesh would be nice to have... */
- (void) GNUNET_HELPER_send (helper_handle,
- mhdr,
- GNUNET_YES,
- NULL, NULL);
- break;
+ tun->proto = htons (ETH_P_IPV4);
+ prepare_ipv4_packet (payload, payload_length,
+ IPPROTO_UDP,
+ NULL,
+ source_address,
+ destination_address,
+ ipv4);
}
- case 6:
+ break;
+ case AF_INET6:
{
- size_t len =
- sizeof (struct GNUNET_MessageHeader) + sizeof (struct tun_header) +
- sizeof (struct ip6_header) + pkt_len;
- char buf[len];
- struct tun_header *hdr;
- struct GNUNET_MessageHeader *mhdr;
+ struct GNUNET_TUN_IPv6Header * ipv6 = (struct GNUNET_TUN_IPv6Header*) &tun[1];
- memset (buf, 0, len);
- mhdr = (struct GNUNET_MessageHeader*) buf;
- hdr = (struct tun_header *) &mhdr[1];
- mhdr->type = htons (GNUNET_MESSAGE_TYPE_VPN_HELPER);
- mhdr->size = htons (len);
- hdr->flags = 0;
- hdr->proto = htons (0x86dd);
- prepare_ipv6_packet (len, pkt_len, pkt, IPPROTO_TCP, &serv->v6.ip6address,
- tunnel, &u_i, (struct ip6_header *) buf);
- /* FIXME: here, flow-control with mesh would be nice to have... */
- (void) GNUNET_HELPER_send (helper_handle,
- (const struct GNUNET_MessageHeader*) buf,
- GNUNET_YES,
- NULL, NULL);
-
- break;
+ 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;
}
-
-
- update_state_map (&u_i, desc, tunnel, serv);
-#endif
- return GNUNET_YES;
+ if (NULL != helper_handle)
+ (void) GNUNET_HELPER_send (helper_handle,
+ (const struct GNUNET_MessageHeader*) buf,
+ GNUNET_YES,
+ NULL, NULL);
+ }
}
+/**
+ * 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 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,
+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)
{
- // FIXME
-#if 0
- GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
- struct tcp_packet *pkt = (struct tcp_packet *) (desc + 1);
- struct remote_addr *s = (struct remote_addr *) desc;
- char *buf;
- size_t len;
- uint16_t pkt_len =
- ntohs (message->size) - sizeof (struct GNUNET_MessageHeader) -
- sizeof (GNUNET_HashCode);
-
- struct redirect_state *state = GNUNET_malloc (sizeof (struct redirect_state));
-
- state->tunnel = tunnel;
- state->type = REMOTE;
- state->hashmap = tcp_connections;
- memcpy (&state->remote, s, sizeof (struct remote_addr));
-
- hash_redirect_info (&state->hash, &state->redirect_info, s->addrlen);
+ 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;
- if (GNUNET_NO ==
- GNUNET_CONTAINER_multihashmap_contains (tcp_connections, &state->hash))
+ if (GNUNET_YES == state->is_dns)
{
- GNUNET_CONTAINER_multihashmap_put (tcp_connections, &state->hash, state,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
-
- state->heap_node =
- GNUNET_CONTAINER_heap_insert (tcp_connections_heap, state,
- GNUNET_TIME_absolute_get ().abs_value);
-
- if (GNUNET_CONTAINER_heap_get_size (tcp_connections_heap) >
- max_tcp_connections)
- GNUNET_SCHEDULER_add_now (collect_connections, tcp_connections_heap);
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
}
- else
- GNUNET_free (state);
-
-
-
- len =
- sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
- sizeof (struct ip6_hdr) + pkt_len;
- buf = alloca (len);
-
- memset (buf, 0, len);
-
- switch (s->addrlen)
+ if (GNUNET_SYSERR == state->is_dns)
{
- case 4:
- prepare_ipv4_packet (len, pkt_len, pkt, IPPROTO_TCP, &s->addr, tunnel,
- state, (struct ip4_header *) buf);
- break;
- case 16:
- prepare_ipv6_packet (len, pkt_len, pkt, IPPROTO_TCP, &s->addr, tunnel,
- state, (struct ip6_header *) buf);
- break;
- default:
- GNUNET_free (state);
+ /* 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);
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# UDP IP-exit requests received via mesh"),
+ 1, GNUNET_NO);
+ if (pkt_len < sizeof (struct GNUNET_EXIT_UdpInternetMessage))
+ {
+ GNUNET_break_op (0);
return GNUNET_SYSERR;
}
-
- /* FIXME: here, flow-control with mesh would be nice to have... */
- (void) GNUNET_HELPER_send (helper_handle,
- (const struct GNUNET_MessageHeader*) buf,
- GNUNET_YES,
- NULL, NULL);
-
-#endif
- return GNUNET_YES;
-}
-
-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)
-{
- // FIXME
-#if 0
- GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
- struct udp_packet *pkt = (struct udp_packet *) (desc + 1);
- struct remote_addr *s = (struct remote_addr *) desc;
- char *buf;
- size_t len;
-
- GNUNET_assert (ntohs (pkt->len) ==
- ntohs (message->size) - sizeof (struct GNUNET_MessageHeader) -
- sizeof (GNUNET_HashCode));
-
- /* Prepare the state.
- * This will be saved in the hashmap, so that the receiving procedure knows
- * through which tunnel this connection has to be routed.
- */
- struct redirect_state *state = GNUNET_malloc (sizeof (struct redirect_state));
-
- state->tunnel = tunnel;
- state->hashmap = udp_connections;
- state->type = REMOTE;
- memcpy (&state->remote, s, sizeof (struct remote_addr));
-
- len =
- sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
- sizeof (struct ip6_hdr) + ntohs (pkt->len);
- buf = alloca (len);
-
- memset (buf, 0, len);
-
- switch (s->addrlen)
+ 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;
+ switch (af)
{
- case 4:
- prepare_ipv4_packet (len, ntohs (pkt->len), pkt, IPPROTO_UDP, &s->addr,
- tunnel, state, (struct ip4_header *) buf);
+ 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;
break;
- case 16:
- prepare_ipv6_packet (len, ntohs (pkt->len), pkt, IPPROTO_UDP, &s->addr,
- tunnel, state, (struct ip6_header *) buf);
+ 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;
break;
default:
- GNUNET_assert (0);
- break;
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
}
-
- hash_redirect_info (&state->hash, &state->redirect_info, s->addrlen);
-
- (void) GNUNET_HELPER_send (helper_handle,
- (const struct GNUNET_MessageHeader*) buf,
- GNUNET_YES,
- NULL, NULL);
-
-
- if (GNUNET_NO ==
- GNUNET_CONTAINER_multihashmap_contains (udp_connections, &state->hash))
{
- GNUNET_CONTAINER_multihashmap_put (udp_connections, &state->hash, state,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
-
- state->heap_node =
- GNUNET_CONTAINER_heap_insert (udp_connections_heap, state,
- GNUNET_TIME_absolute_get ().abs_value);
-
- if (GNUNET_CONTAINER_heap_get_size (udp_connections_heap) >
- max_udp_connections)
- GNUNET_SCHEDULER_add_now (collect_connections, udp_connections_heap);
+ 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->specifics.tcp_udp.ri.remote_address.address,
+ buf, sizeof (buf)),
+ (unsigned int) ntohs (msg->destination_port));
}
- else
- GNUNET_free (state);
-#endif
+ 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;
}
+
/**
- * The messages are one GNUNET_HashCode for the service, followed by a struct udp_packet
+ * Process a request via mesh to send a request to a UDP 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_udp_service (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
const struct GNUNET_MessageHeader *message,
const struct GNUNET_ATS_Information *atsi GNUNET_UNUSED)
{
- // FIXME
-#if 0
- GNUNET_HashCode *desc = (GNUNET_HashCode *) (message + 1);
- struct udp_packet *pkt = (struct udp_packet *) (desc + 1);
+ struct TunnelState *state = *tunnel_ctx;
+ const struct GNUNET_EXIT_UdpServiceMessage *msg;
uint16_t pkt_len = ntohs (message->size);
- struct redirect_service *serv;
- /* check that we got at least a valid header */
- if (pkt_len < sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode) + sizeof (struct udp_packet))
+ if (GNUNET_YES == state->is_dns)
{
GNUNET_break_op (0);
- return GNUNET_YES;
+ return GNUNET_SYSERR;
}
- pkt_len -= (sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode));
-
- GNUNET_assert (ntohs (pkt->len) ==
- ntohs (message->size) - sizeof (struct GNUNET_MessageHeader) -
- sizeof (GNUNET_HashCode));
-
- if (NULL == (serv = find_service (udp_services, desc, ntohs (pkt->dpt))))
+ if (GNUNET_SYSERR == state->is_dns)
{
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("No service found for %s on port %d!\n"),
- "UDP",
- ntohs (pkt->dpt));
- return GNUNET_YES;
+ /* tunnel is UDP/TCP from now on */
+ state->is_dns = GNUNET_NO;
}
- pkt->dpt = htons (serv->remote_port);
-
- /*
- * At this point it would be possible to check against some kind of ACL.
- */
-
- char *buf;
- size_t len;
-
- /* Prepare the state.
- * This will be saved in the hashmap, so that the receiving procedure knows
- * through which tunnel this connection has to be routed.
- */
- struct redirect_state *state = GNUNET_malloc (sizeof (struct redirect_state));
-
- state->tunnel = tunnel;
- state->serv = serv;
- state->type = SERVICE;
- state->hashmap = udp_connections;
- memcpy (&state->desc, desc, sizeof (GNUNET_HashCode));
-
- len =
- sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
- sizeof (struct ip6_hdr) + ntohs (pkt->len);
- buf = alloca (len);
-
- memset (buf, 0, len);
-
- switch (serv->version)
+ 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))
{
- case 4:
- prepare_ipv4_packet (len, ntohs (pkt->len), pkt, IPPROTO_UDP,
- &serv->v4.ip4address, tunnel, state,
- (struct ip4_header *) buf);
- break;
- case 6:
- prepare_ipv6_packet (len, ntohs (pkt->len), pkt, IPPROTO_UDP,
- &serv->v6.ip6address, tunnel, state,
- (struct ip6_header *) buf);
-
- break;
- default:
- GNUNET_assert (0);
- break;
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
}
-
- hash_redirect_info (&state->hash, &state->redirect_info,
- serv->version == 4 ? 4 : 16);
-
- if (GNUNET_NO ==
- GNUNET_CONTAINER_multihashmap_contains (udp_connections, &state->hash))
+ 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 (sender),
+ 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_CONTAINER_multihashmap_put (udp_connections, &state->hash, state,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
-
- state->heap_node =
- GNUNET_CONTAINER_heap_insert (udp_connections_heap, state,
- GNUNET_TIME_absolute_get ().abs_value);
-
- if (GNUNET_CONTAINER_heap_get_size (udp_connections_heap) >
- max_udp_connections)
- GNUNET_SCHEDULER_add_now (collect_connections, udp_connections_heap);
+ 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;
}
- else
- GNUNET_free (state);
-
- (void) GNUNET_HELPER_send (helper_handle,
- (const struct GNUNET_MessageHeader*) buf,
- GNUNET_YES,
- NULL, NULL);
-#endif
+ 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;
}
-
-
-
-
-
/**
* Callback from GNUNET_MESH for new tunnels.
*
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_ATS_Information *atsi GNUNET_UNUSED)
{
- struct tunnel_state *s = GNUNET_malloc (sizeof (struct tunnel_state));
-
+ struct TunnelState *s = GNUNET_malloc (sizeof (struct TunnelState));
+
+ s->is_dns = GNUNET_SYSERR;
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# Inbound MESH tunnels created"),
+ 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received inbound tunnel from `%s'\n",
+ GNUNET_i2s (initiator));
s->tunnel = tunnel;
return s;
}
clean_tunnel (void *cls GNUNET_UNUSED, const struct GNUNET_MESH_Tunnel *tunnel,
void *tunnel_ctx)
{
- struct tunnel_state *s = tunnel_ctx;
- struct tunnel_notify_queue *tnq;
+ struct TunnelState *s = tunnel_ctx;
+ struct TunnelMessageQueue *tnq;
- while (NULL != (tnq = s->head))
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Tunnel destroyed\n");
+ if (GNUNET_SYSERR == s->is_dns)
+ {
+ GNUNET_free (s);
+ return;
+ }
+ if (GNUNET_YES == s->is_dns)
+ {
+ if (tunnels[s->specifics.dns.my_id] == s)
+ tunnels[s->specifics.dns.my_id] = NULL;
+ GNUNET_free_non_null (s->specifics.dns.reply);
+ }
+ else
{
- GNUNET_CONTAINER_DLL_remove (s->head,
- s->tail,
- tnq);
- GNUNET_free (tnq);
+ 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;
{
unsigned int i;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Exit service is shutting down now\n");
+
if (helper_handle != NULL)
{
GNUNET_HELPER_stop (helper_handle);
GNUNET_CONTAINER_multihashmap_destroy (udp_services);
udp_services = NULL;
}
- for (i=0;i<5;i++)
+ if (NULL != dnsstub)
+ {
+ GNUNET_DNSSTUB_stop (dnsstub);
+ dnsstub = NULL;
+ }
+ if (stats != NULL)
+ {
+ GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
+ stats = NULL;
+ }
+ for (i=0;i<8;i++)
GNUNET_free_non_null (exit_argv[i]);
}
char *redirect;
char *hostname;
char *hostport;
- struct redirect_service *serv;
+ struct LocalService *serv;
for (redirect = strtok (cpy, " "); redirect != NULL;
redirect = strtok (NULL, " "))
continue;
}
- serv = GNUNET_malloc (sizeof (struct redirect_service));
+ serv = GNUNET_malloc (sizeof (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));
+ 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));
serv->address.af = res->ai_family;
switch (res->ai_family)
{
- case AF_INET:
- serv->address.address.ipv4 = ((struct sockaddr_in *) res->ai_addr)->sin_addr;
- break;
- case AF_INET6:
- serv->address.address.ipv6 = ((struct sockaddr_in6 *) res->ai_addr)->sin6_addr;
- break;
+ case AF_INET:
+ if (! ipv4_enabled)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Service `%s' configured for IPv4, but IPv4 is disabled!\n"),
+ name);
+ freeaddrinfo (res);
+ GNUNET_free (serv);
+ continue;
+ }
+ 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);
+ freeaddrinfo (res);
+ GNUNET_free (serv);
+ continue;
+ }
+ serv->address.address.ipv6 = ((struct sockaddr_in6 *) res->ai_addr)->sin6_addr;
+ break;
default:
freeaddrinfo (res);
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
const struct GNUNET_CONFIGURATION_Handle *cfg_)
{
static struct GNUNET_MESH_MessageHandler handlers[] = {
- {&receive_udp_service, GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP, 0},
- {&receive_tcp_service, GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP, 0},
- {NULL, 0, 0},
- {NULL, 0, 0},
+ {&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}
};
static GNUNET_MESH_ApplicationType apptypes[] = {
+ GNUNET_APPLICATION_TYPE_END,
GNUNET_APPLICATION_TYPE_END,
GNUNET_APPLICATION_TYPE_END,
GNUNET_APPLICATION_TYPE_END
};
- unsigned int handler_idx;
unsigned int app_idx;
- int udp;
- int tcp;
- char *ifname;
+ char *exit_ifname;
+ char *tun_ifname;
char *ipv6addr;
char *ipv6prefix_s;
char *ipv4addr;
char *ipv4mask;
- struct in_addr v4;
- struct in6_addr v6;
+ char *binary;
+ char *regex;
+ char *prefixed_regex;
+ struct in_addr dns_exit4;
+ struct in6_addr dns_exit6;
+ char *dns_exit;
cfg = cfg_;
- 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;
- exit_argv[0] = GNUNET_strdup ("exit-gnunet");
- if (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IFNAME", &ifname))
+ 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) )
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No entry 'IFNAME' in configuration!\n");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-exit");
+ if (GNUNET_YES !=
+ GNUNET_OS_check_helper_binary (binary))
+ {
+ 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);
}
- exit_argv[1] = ifname;
- if ( (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV6ADDR",
- &ipv6addr) ||
- (1 != inet_pton (AF_INET6, ipv6addr, &v6))) )
+ 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,
- "No valid entry 'IPV6ADDR' in configuration!\n");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ _("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;
}
- exit_argv[2] = ipv6addr;
- if (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV6PREFIX",
- &ipv6prefix_s))
+ if ( (ipv6_exit || ipv6_enabled) &&
+ GNUNET_OK != GNUNET_NETWORK_test_pf (PF_INET6))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No entry 'IPV6PREFIX' in configuration!\n");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ _("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;
}
- exit_argv[3] = ipv6prefix_s;
- if ( (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (cfg, "exit",
- "IPV6PREFIX",
- &ipv6prefix)) ||
- (ipv6prefix >= 127) )
+ if (ipv4_exit && (! ipv4_enabled))
{
- GNUNET_SCHEDULER_shutdown ();
- return;
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Cannot enable IPv4 exit but disable IPv4 on TUN interface, will use ENABLE_IPv4=YES\n"));
+ ipv4_enabled = GNUNET_YES;
}
-
- if ( (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV4ADDR",
- &ipv4addr) ||
- (1 != inet_pton (AF_INET, ipv4addr, &v4))) )
+ if (ipv6_exit && (! ipv6_enabled))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No valid entry for 'IPV4ADDR' in configuration!\n");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ _("Cannot enable IPv6 exit but disable IPv6 on TUN interface, will use ENABLE_IPv6=YES\n"));
+ ipv6_enabled = GNUNET_YES;
}
- exit_argv[4] = ipv4addr;
- if ( (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV4MASK",
- &ipv4mask) ||
- (1 != inet_pton (AF_INET, ipv4mask, &v4))) )
+ if (! (ipv4_enabled || ipv6_enabled))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No valid entry 'IPV4MASK' in configuration!\n");
+ _("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;
}
- exit_argv[5] = ipv4mask;
- exit_argv[6] = NULL;
+ if (NULL != dns_exit)
+ dnsstub = GNUNET_DNSSTUB_start (dns_exit);
+
app_idx = 0;
- handler_idx = 2;
- udp = GNUNET_CONFIGURATION_get_value_yesno (cfg, "exit", "ENABLE_UDP");
- tcp = GNUNET_CONFIGURATION_get_value_yesno (cfg, "exit", "ENABLE_TCP");
- if (GNUNET_YES == udp)
- {
- handlers[handler_idx].callback = &receive_udp_remote;
- handlers[handler_idx].expected_size = 0;
- handlers[handler_idx].type = GNUNET_MESSAGE_TYPE_VPN_REMOTE_UDP;
- apptypes[app_idx] = GNUNET_APPLICATION_TYPE_INTERNET_UDP_GATEWAY;
- handler_idx++;
+ if (GNUNET_YES == ipv4_exit)
+ {
+ apptypes[app_idx] = GNUNET_APPLICATION_TYPE_IPV4_GATEWAY;
app_idx++;
}
-
- if (GNUNET_YES == tcp)
+ if (GNUNET_YES == ipv6_exit)
+ {
+ apptypes[app_idx] = GNUNET_APPLICATION_TYPE_IPV6_GATEWAY;
+ app_idx++;
+ }
+ if (NULL != dns_exit)
{
- handlers[handler_idx].callback = &receive_tcp_remote;
- handlers[handler_idx].expected_size = 0;
- handlers[handler_idx].type = GNUNET_MESSAGE_TYPE_VPN_REMOTE_TCP;
- apptypes[app_idx] = GNUNET_APPLICATION_TYPE_INTERNET_TCP_GATEWAY;
- handler_idx++;
+ apptypes[app_idx] = GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER;
app_idx++;
}
- udp_services = GNUNET_CONTAINER_multihashmap_create (65536);
- tcp_services = GNUNET_CONTAINER_multihashmap_create (65536);
+
+ 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;
+ 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;
+ }
+ exit_argv[1] = tun_ifname;
+ if (ipv4_enabled)
+ {
+ 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_SCHEDULER_shutdown ();
+ return;
+ }
+ exit_argv[2] = exit_ifname;
+ }
+ else
+ {
+ exit_argv[2] = GNUNET_strdup ("%");
+ }
+
+
+ if (GNUNET_YES == ipv6_enabled)
+ {
+ if ( (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV6ADDR",
+ &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;
+ }
+ exit_argv[3] = ipv6addr;
+ if (GNUNET_SYSERR ==
+ 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;
+ }
+ exit_argv[4] = ipv6prefix_s;
+ if ( (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (cfg, "exit",
+ "IPV6PREFIX",
+ &ipv6prefix)) ||
+ (ipv6prefix >= 127) )
+ {
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ }
+ else
+ {
+ /* IPv6 explicitly disabled */
+ exit_argv[3] = GNUNET_strdup ("-");
+ exit_argv[4] = GNUNET_strdup ("-");
+ }
+ if (GNUNET_YES == ipv4_enabled)
+ {
+ if ( (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV4ADDR",
+ &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;
+ }
+ exit_argv[5] = ipv4addr;
+ if ( (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV4MASK",
+ &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;
+ }
+ exit_argv[6] = ipv4mask;
+ }
+ else
+ {
+ /* IPv4 explicitly disabled */
+ exit_argv[5] = GNUNET_strdup ("-");
+ exit_argv[6] = GNUNET_strdup ("-");
+ }
+ exit_argv[7] = NULL;
+
+ 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,
+ = GNUNET_MESH_connect (cfg, NULL,
&new_tunnel,
&clean_tunnel, handlers,
apptypes);
GNUNET_SCHEDULER_shutdown ();
return;
}
- helper_handle = GNUNET_HELPER_start ("gnunet-helper-vpn",
- exit_argv,
- &message_token, NULL);
+
+ /* Mesh handle acquired, now announce regular expressions matching our exit */
+ if ( (GNUNET_YES == ipv4_enabled) && (GNUNET_YES == ipv4_exit) )
+ {
+ 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);
+ GNUNET_MESH_announce_regex (mesh_handle,
+ prefixed_regex,
+ REGEX_MAX_PATH_LEN_IPV4);
+ GNUNET_free (regex);
+ GNUNET_free (prefixed_regex);
+ }
+
+ if (GNUNET_YES == ipv6_enabled && GNUNET_YES == ipv6_exit)
+ {
+ 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);
+ GNUNET_MESH_announce_regex (mesh_handle,
+ prefixed_regex,
+ 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)) ? ret : 1;
+ options, &run, NULL)) ? global_ret : 1;
}
projects / oweals / gnunet.git / blobdiff