* @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;
-};
-
-/**
- * Standard IPv4 header.
- */
-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;
-};
-
-/**
- * Standard IPv6 header.
- */
-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
-
-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.
- */
-struct udp_packet
-{
- uint16_t spt GNUNET_PACKED;
- uint16_t dpt GNUNET_PACKED;
- uint16_t len GNUNET_PACKED;
- uint16_t crc GNUNET_PACKED;
-};
-
-/**
- * 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
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_protocols.h"
+#include "gnunet_applications.h"
+#include "gnunet_mesh_service.h"
+#include "gnunet_statistics_service.h"
+#include "gnunet_constants.h"
+#include "gnunet_tun_lib.h"
+#include "exit.h"
/**
* Information about an address.
*/
static char *exit_argv[7];
+/**
+ * IPv6 address of our TUN interface.
+ */
+static struct in6_addr exit_ipv6addr;
+
/**
* IPv6 prefix (0..127) from configuration file.
*/
static unsigned long long ipv6prefix;
+/**
+ * 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 struct GNUNET_STATISTICS_Handle *stats;
+
/**
* The handle to mesh
*/
/**
* If there are at least this many connections, old ones will be removed
*/
-static long long unsigned int max_connections = 200;
+static long long unsigned int max_connections;
/**
* This hashmaps saves interesting things about the configured UDP services
*/
static struct GNUNET_CONTAINER_MultiHashMap *tcp_services;
+/**
+ * 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;
+
/**
* Given IP information about a connection, calculate the respective
if (NULL == state)
return NULL;
/* Mark this connection as freshly used */
- GNUNET_CONTAINER_heap_update_cost (connections_heap,
- state->heap_node,
- GNUNET_TIME_absolute_get ().abs_value);
+ if (NULL == state_key)
+ GNUNET_CONTAINER_heap_update_cost (connections_heap,
+ state->heap_node,
+ GNUNET_TIME_absolute_get ().abs_value);
return state;
}
* @param dpt destination port
* @return NULL if we are not aware of such a service
*/
-struct LocalService *
+static struct LocalService *
find_service (struct GNUNET_CONTAINER_MultiHashMap *service_map,
const GNUNET_HashCode *desc,
uint16_t dpt)
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 before payload (optional)
- * @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 TunnelState *s;
- struct TunnelMessageQueue *tnq;
- struct GNUNET_MessageHeader *msg;
- size_t len;
- GNUNET_HashCode *dp;
- 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 TunnelMessageQueue) + len);
- tnq->payload = &tnq[1];
- tnq->len = len;
- msg = (struct GNUNET_MessageHeader *) &tnq[1];
- msg->size = htons ((uint16_t) len);
- msg->type = htons (mtype);
- if (NULL != desc)
- {
- dp = (GNUNET_HashCode *) &msg[1];
- *dp = *desc;
- memcpy (&dp[1], payload, payload_length);
- }
- else
- {
- memcpy (&msg[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);
if (NULL == s->th)
s->th = GNUNET_MESH_notify_transmit_ready (mesh_tunnel, GNUNET_NO /* cork */, 0 /* priority */,
GNUNET_TIME_UNIT_FOREVER_REL,
- NULL, len,
+ NULL, tnq->len,
&send_to_peer_notify_callback,
s);
}
* 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,
int af,
const void *destination_ip,
const void *source_ip)
{
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->spt),
+ inet_ntop (af,
+ source_ip,
+ dbuf, sizeof (dbuf)),
+ (unsigned int) ntohs (udp->dpt));
+ }
+ if (pktlen < sizeof (struct GNUNET_TUN_UdpHeader))
{
/* blame kernel */
GNUNET_break (0);
_("Packet dropped, have no matching connection information\n"));
return;
}
+ 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,
- &udp[1], pktlen - sizeof (struct udp_packet),
- NULL,
- state->serv != NULL
- ? GNUNET_MESSAGE_TYPE_VPN_SERVICE_UDP_BACK
- : GNUNET_MESSAGE_TYPE_VPN_REMOTE_UDP_BACK);
+ 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 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)
* 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,
int af,
const void *destination_ip,
{
struct TunnelState *state;
char buf[pktlen];
- struct tcp_packet *mtcp;
+ 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 going from %s:%u to %s:%u\n",
+ inet_ntop (af,
+ source_ip,
+ sbuf, sizeof (sbuf)),
+ (unsigned int) ntohs (tcp->spt),
+ inet_ntop (af,
+ source_ip,
+ dbuf, sizeof (dbuf)),
+ (unsigned int) ntohs (tcp->dpt));
+ }
+ if (pktlen < sizeof (struct GNUNET_TUN_TcpHeader))
{
/* blame kernel */
GNUNET_break (0);
/* mug port numbers and crc to avoid information leakage;
sender will need to lookup the correct values anyway */
memcpy (buf, tcp, pktlen);
- mtcp = (struct tcp_packet *) buf;
+ mtcp = (struct GNUNET_TUN_TcpHeader *) buf;
mtcp->spt = 0;
mtcp->dpt = 0;
mtcp->crc = 0;
+
+ mlen = sizeof (struct GNUNET_EXIT_TcpDataMessage) + (pktlen - sizeof (struct GNUNET_TUN_TcpHeader));
+ if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ 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);
+ tdm->reserved = htonl (0);
+ memcpy (&tdm->tcp_header,
+ buf,
+ pktlen);
send_packet_to_mesh_tunnel (state->tunnel,
- mtcp, pktlen,
- NULL,
- state->serv != NULL
- ? GNUNET_MESSAGE_TYPE_VPN_SERVICE_TCP_BACK
- : GNUNET_MESSAGE_TYPE_VPN_REMOTE_TCP_BACK);
+ tnq);
}
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_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;
}
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;
}
- 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:
{
- const struct ip6_header *pkt6;
+ const struct GNUNET_TUN_IPv6Header *pkt6;
- if (size < sizeof (struct ip6_header))
+ if (size < sizeof (struct GNUNET_TUN_IPv6Header))
{
/* Kernel to blame? */
GNUNET_break (0);
return;
}
- pkt6 = (struct ip6_header *) &pkt_tun[1];
+ pkt6 = (struct GNUNET_TUN_IPv6Header *) &pkt_tun[1];
if (size != ntohs (pkt6->payload_length))
{
/* Kernel to blame? */
GNUNET_break (0);
return;
}
- size -= sizeof (struct ip6_header);
+ size -= sizeof (struct GNUNET_TUN_IPv6Header);
switch (pkt6->next_header)
{
case IPPROTO_UDP:
- udp_from_helper ((const struct udp_packet *) &pkt6[1], size,
+ 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 *) &pkt6[1], size,
+ tcp_from_helper ((const struct GNUNET_TUN_TcpHeader *) &pkt6[1], size,
AF_INET6,
&pkt6->destination_address,
&pkt6->source_address);
break;
case ETH_P_IPV4:
{
- const struct ip4_header *pkt4;
+ const struct GNUNET_TUN_IPv4Header *pkt4;
- if (size < sizeof (struct ip4_header))
+ if (size < sizeof (struct GNUNET_TUN_IPv4Header))
{
/* Kernel to blame? */
GNUNET_break (0);
return;
}
- pkt4 = (const struct ip4_header *) &pkt_tun[1];
+ pkt4 = (const struct GNUNET_TUN_IPv4Header *) &pkt_tun[1];
if (size != ntohs (pkt4->total_length))
{
/* Kernel to blame? */
GNUNET_break (0);
return;
}
- if (pkt4->header_length * 4 != sizeof (struct ip4_header))
+ if (pkt4->header_length * 4 != sizeof (struct GNUNET_TUN_IPv4Header))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("IPv4 packet options received. Ignored.\n"));
return;
}
- size -= sizeof (struct ip4_header);
+ size -= sizeof (struct GNUNET_TUN_IPv4Header);
switch (pkt4->protocol)
{
case IPPROTO_UDP:
- udp_from_helper ((const struct udp_packet *) &pkt4[1], size,
+ udp_from_helper ((const struct GNUNET_TUN_UdpHeader *) &pkt4[1], size,
AF_INET,
&pkt4->destination_address,
&pkt4->source_address);
case IPPROTO_TCP:
- tcp_from_helper ((const struct tcp_packet *) &pkt4[1], size,
+ tcp_from_helper ((const struct GNUNET_TUN_TcpHeader *) &pkt4[1], size,
AF_INET,
&pkt4->destination_address,
&pkt4->source_address);
}
+/**
+ * We need to create a (unique) fresh local address (IP+port).
+ * Fill one in.
+ *
+ * @param af desired address family
+ * @param proto desired protocol (IPPROTO_UDP or IPPROTO_TCP)
+ * @param local_address address to initialize
+ */
+static void
+setup_fresh_address (int af,
+ uint8_t proto,
+ struct SocketAddress *local_address)
+{
+ local_address->af = af;
+ local_address->proto = (uint8_t) proto;
+ /* default "local" port range is often 32768--61000,
+ so we pick a random value in that range */
+ local_address->port
+ = (uint16_t) 32768 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+ 28232);
+ switch (af)
+ {
+ case AF_INET:
+ {
+ struct in_addr addr;
+ struct in_addr mask;
+ struct in_addr rnd;
+ addr = exit_ipv4addr;
+ mask = exit_ipv4mask;
+ if (0 == ~mask.s_addr)
+ {
+ /* 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 AF_INET6:
+ {
+ 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>=128-ipv6prefix;i--)
+ mask.s6_addr[i / 8] |= (1 << (i % 8));
+
+ /* Pick random IPv6 address within the subnet, except 'addr' or 'mask' itself */
+ do
+ {
+ for (i=0;i<16;i++)
+ {
+ rnd.s6_addr[i] = (unsigned char) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+ 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->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
+setup_state_record (struct TunnelState *state)
+{
+ GNUNET_HashCode key;
+ struct TunnelState *s;
-void
-prepare_ipv4_packet (size_t len,
- uint16_t pktlen, void *payload,
- uint8_t protocol,
- void *ipaddress, void *tunnel,
- struct RedirectInformation *
- state, struct ip4_header *pkt4)
+ /* generate fresh, unique address */
+ do
+ {
+ if (NULL == state->serv)
+ setup_fresh_address (state->ri.remote_address.af,
+ state->ri.remote_address.proto,
+ &state->ri.local_address);
+ else
+ setup_fresh_address (state->serv->address.af,
+ state->serv->address.proto,
+ &state->ri.local_address);
+ } while (NULL != get_redirect_state (state->ri.remote_address.af,
+ state->ri.remote_address.proto,
+ &state->ri.remote_address.address,
+ state->ri.remote_address.port,
+ &state->ri.local_address.address,
+ state->ri.local_address.port,
+ &key));
+ {
+ char buf[INET6_ADDRSTRLEN];
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Picked local address %s:%u for new connection\n",
+ inet_ntop (state->ri.local_address.af,
+ &state->ri.local_address.address,
+ buf, sizeof (buf)),
+ (unsigned int) state->ri.local_address.port);
+ }
+ state->state_key = key;
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_put (connections_map,
+ &key, state,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ state->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->heap_node = NULL;
+ GNUNET_MESH_tunnel_destroy (s->tunnel);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_remove (connections_map,
+ &s->state_key,
+ s));
+ GNUNET_free (s);
+ }
+}
+
+
+/**
+ * Prepare an IPv4 packet for transmission via the TUN interface.
+ * Initializes the IP header and calculates checksums (IP+UDP/TCP).
+ * For UDP, the UDP header will be fully created, whereas for TCP
+ * only the ports and checksum will be filled in. So for TCP,
+ * a skeleton TCP header must be part of the provided payload.
+ *
+ * @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 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_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)
{
- 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);
+ size_t len;
+ len = payload_length;
+ switch (protocol)
+ {
+ case IPPROTO_UDP:
+ len += sizeof (struct GNUNET_TUN_UdpHeader);
+ break;
+ case IPPROTO_TCP:
+ len += sizeof (struct GNUNET_TUN_TcpHeader);
+ GNUNET_assert (NULL != tcp_header);
+ break;
+ default:
+ GNUNET_break (0);
+ return;
+ }
+ if (len + sizeof (struct GNUNET_TUN_IPv4Header) > UINT16_MAX)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ GNUNET_TUN_initialize_ipv4_header (pkt4,
+ protocol,
+ len,
+ &src_address->address.ipv4,
+ &dst_address->address.ipv4);
switch (protocol)
{
case IPPROTO_UDP:
{
- struct udp_packet *pkt4_udp = (struct udp_packet *) &pkt4[1];
- // FIXME: state->pt = pkt4_udp->spt;
- pkt4_udp->crc = 0; /* Optional for IPv4 */
+ struct GNUNET_TUN_UdpHeader *pkt4_udp = (struct GNUNET_TUN_UdpHeader *) &pkt4[1];
+
+ pkt4_udp->spt = htons (src_address->port);
+ pkt4_udp->dpt = htons (dst_address->port);
+ pkt4_udp->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 tcp_packet *pkt4_tcp = (struct tcp_packet *) &pkt4[1];
+ struct GNUNET_TUN_TcpHeader *pkt4_tcp = (struct GNUNET_TUN_TcpHeader *) &pkt4[1];
- // 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);
+ memcpy (pkt4_tcp, tcp_header, sizeof (struct GNUNET_TUN_TcpHeader));
+ pkt4_tcp->spt = htons (src_address->port);
+ pkt4_tcp->dpt = htons (dst_address->port);
+ GNUNET_TUN_calculate_tcp4_checksum (pkt4,
+ pkt4_tcp,
+ payload,
+ payload_length);
+ memcpy (&pkt4_tcp[1], payload, payload_length);
}
break;
default:
}
-void
-prepare_ipv6_packet (size_t len, uint16_t pktlen, void *payload,
- uint16_t protocol, void *ipaddress, void *tunnel,
- struct RedirectInformation *state, struct ip6_header *pkt6)
+/**
+ * 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 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)
{
- const char *ipv6addr = exit_argv[2];
- uint32_t tmp;
-
-
- memcpy (&pkt6[1], payload, pktlen);
-
- pkt6->version = 6;
- pkt6->next_header = protocol;
- pkt6->payload_length = htons (pktlen);
- pkt6->hop_limit = 64;
-
- 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*/
-
- unsigned long long ipv6prefix_r = (ipv6prefix + 7) / 8;
-
- inet_pton (AF_INET6, ipv6addr, &pkt6->source_address);
-
- if (ipv6prefix_r < (16 - sizeof (void *)))
- ipv6prefix_r = 16 - sizeof (void *);
-
- unsigned int offset = ipv6prefix_r - (16 - sizeof (void *));
+ 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:
+ /* tcp_header (with port/crc not set) must be part of payload! */
+ if (len < sizeof (struct GNUNET_TUN_TcpHeader))
+ {
+ GNUNET_break (0);
+ return;
+ }
+ 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,
+ &dst_address->address.ipv6,
+ &src_address->address.ipv6);
switch (protocol)
{
case IPPROTO_UDP:
{
- struct udp_packet *pkt6_udp = (struct udp_packet *) &pkt6[1];
-
- // FIXME: state->pt = pkt6_udp->spt;
+ struct GNUNET_TUN_UdpHeader *pkt6_udp = (struct GNUNET_TUN_UdpHeader *) &pkt6[1];
+
+ pkt6_udp->spt = htons (src_address->port);
+ pkt6_udp->dpt = htons (dst_address->port);
+ pkt6_udp->len = htons ((uint16_t) payload_length);
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);
+ GNUNET_TUN_calculate_udp6_checksum (pkt6,
+ pkt6_udp,
+ payload,
+ payload_length);
+ memcpy (&pkt6[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;
+
+ /* memcpy first here as some TCP header fields are initialized this way! */
+ memcpy (pkt6_tcp, payload, payload_length);
+ pkt6_tcp->spt = htons (src_address->port);
+ pkt6_tcp->dpt = htons (dst_address->port);
+ GNUNET_TUN_calculate_tcp6_checksum (pkt6,
+ pkt6_tcp,
+ 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 template to use
+ * @param payload payload of the TCP packet
+ * @param payload_length number of bytes in 'payload'
*/
-void
-update_state_map (const struct RedirectInformation *ri,
- struct GNUNET_MESH_Tunnel *tunnel,
- const GNUNET_HashCode *desc,
- struct LocalService *serv)
+static void
+send_tcp_packet_via_tun (const struct SocketAddress *destination_address,
+ const struct SocketAddress *source_address,
+ const struct GNUNET_TUN_TcpHeader *tcp_header,
+ const void *payload, size_t payload_length)
{
- struct TunnelState *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 TunnelState));
- 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 += 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];
+ 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;
+ }
+ (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,
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];
+ struct TunnelState *state = *tunnel_ctx;
+ const struct GNUNET_EXIT_TcpServiceStartMessage *start;
uint16_t pkt_len = ntohs (message->size);
- struct LocalService *serv;
- struct RedirectInformation u_i;
- GNUNET_HashCode state_key;
+ 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_MessageHeader) + sizeof (GNUNET_HashCode) + sizeof (struct tcp_packet))
+ if (pkt_len < sizeof (struct GNUNET_EXIT_TcpServiceStartMessage))
{
GNUNET_break_op (0);
- return GNUNET_YES;
+ return GNUNET_SYSERR;
}
- pkt_len -= (sizeof (struct GNUNET_MessageHeader) + sizeof (GNUNET_HashCode));
-
- if (NULL == (serv = find_service (tcp_services, desc, ntohs (pkt->dpt))))
+ start = (const struct GNUNET_EXIT_TcpServiceStartMessage*) message;
+ pkt_len -= sizeof (struct GNUNET_EXIT_TcpServiceStartMessage);
+ if ( (NULL == state) ||
+ (NULL != state->serv) ||
+ (NULL != state->heap_node) )
+ {
+ 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.dpt));
+ if (NULL == (state->serv = find_service (tcp_services, &start->service_descriptor,
+ ntohs (start->tcp_header.dpt))))
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
_("No service found for %s on port %d!\n"),
"TCP",
- ntohs (pkt->dpt));
- return GNUNET_YES;
+ ntohs (start->tcp_header.dpt));
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# TCP requests dropped (no such service)"),
+ 1, GNUNET_NO);
+ return GNUNET_SYSERR;
}
- pkt->dpt = htons (serv->remote_port);
-
- /* At this point it would be possible to check against some kind of ACL. */
-
- switch (serv->version)
- {
- case 4:
- {
- 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;
-
- 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;
- }
- case 6:
- {
- 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;
-
- 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;
- }
- default:
- GNUNET_assert (0);
- break;
- }
-
-
- update_state_map (&u_i, desc, tunnel, serv);
-#endif
+ state->ri.remote_address = state->serv->address;
+ setup_state_record (state);
+ send_tcp_packet_via_tun (&state->ri.remote_address,
+ &state->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_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 TunnelState *state = GNUNET_malloc (sizeof (struct TunnelState));
+ 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;
- state->tunnel = tunnel;
- state->type = REMOTE;
- state->hashmap = tcp_connections;
- memcpy (&state->remote, s, sizeof (struct remote_addr));
+ 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->serv) ||
+ (NULL != state->heap_node) )
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ af = (int) ntohl (start->af);
+ state->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->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 in_addr);
+ state->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->ri.remote_address.address,
+ buf, sizeof (buf)),
+ (unsigned int) ntohs (start->tcp_header.dpt));
+ }
- hash_redirect_info (&state->hash, &state->redirect_info, s->addrlen);
+ state->ri.remote_address.proto = IPPROTO_TCP;
+ state->ri.remote_address.port = ntohs (start->tcp_header.dpt);
+ setup_state_record (state);
+ send_tcp_packet_via_tun (&state->ri.remote_address,
+ &state->ri.local_address,
+ &start->tcp_header,
+ payload, pkt_len);
+ return GNUNET_YES;
+}
- if (GNUNET_NO ==
- GNUNET_CONTAINER_multihashmap_contains (tcp_connections, &state->hash))
- {
- 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);
+/**
+ * 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_CONTAINER_heap_get_size (tcp_connections_heap) >
- max_tcp_connections)
- GNUNET_SCHEDULER_add_now (collect_connections, tcp_connections_heap);
+ 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->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;
+ }
+ GNUNET_break_op (ntohl (data->reserved) == 0);
+ {
+ char buf[INET6_ADDRSTRLEN];
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received additional data from %s for TCP stream to %s:%u\n",
+ GNUNET_i2s (sender),
+ inet_ntop (state->ri.remote_address.af,
+ &state->ri.remote_address.address,
+ buf, sizeof (buf)),
+ (unsigned int) state->ri.remote_address.port);
}
- else
- GNUNET_free (state);
-
+ send_tcp_packet_via_tun (&state->ri.remote_address,
+ &state->ri.local_address,
+ &data->tcp_header,
+ &data[1], pkt_len);
+ return GNUNET_YES;
+}
- len =
- sizeof (struct GNUNET_MessageHeader) + sizeof (struct pkt_tun) +
- sizeof (struct ip6_hdr) + pkt_len;
- buf = alloca (len);
- memset (buf, 0, len);
+/**
+ * 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;
- switch (s->addrlen)
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# UDP packets sent via TUN"),
+ 1, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending packet with %u bytes UDP payload via TUN\n",
+ (unsigned int) payload_length);
+ len = sizeof (struct GNUNET_MessageHeader) + sizeof (struct GNUNET_TUN_Layer2PacketHeader);
+ switch (source_address->af)
{
- case 4:
- prepare_ipv4_packet (len, pkt_len, pkt, IPPROTO_TCP, &s->addr, tunnel,
- state, (struct ip4_header *) buf);
+ case AF_INET:
+ len += sizeof (struct GNUNET_TUN_IPv4Header);
break;
- case 16:
- prepare_ipv6_packet (len, pkt_len, pkt, IPPROTO_TCP, &s->addr, tunnel,
- state, (struct ip6_header *) buf);
+ case AF_INET6:
+ len += sizeof (struct GNUNET_TUN_IPv6Header);
break;
default:
- GNUNET_free (state);
- return GNUNET_SYSERR;
+ GNUNET_break (0);
+ return;
+ }
+ len += sizeof (struct GNUNET_TUN_UdpHeader);
+ len += payload_length;
+ if (len >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ {
+ char buf[len];
+ 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_UDP,
+ NULL,
+ source_address,
+ destination_address,
+ ipv4);
+ }
+ break;
+ case AF_INET6:
+ {
+ struct GNUNET_TUN_IPv6Header * ipv6 = (struct GNUNET_TUN_IPv6Header*) &tun[1];
+
+ tun->proto = htons (ETH_P_IPV6);
+ prepare_ipv6_packet (payload, payload_length,
+ IPPROTO_UDP,
+ NULL,
+ source_address,
+ destination_address,
+ ipv6);
+ }
+ break;
+ default:
+ GNUNET_assert (0);
+ break;
+ }
+ (void) GNUNET_HELPER_send (helper_handle,
+ (const struct GNUNET_MessageHeader*) buf,
+ GNUNET_YES,
+ NULL, NULL);
}
-
- /* 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;
}
+
+/**
+ * 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_udp_remote (void *cls GNUNET_UNUSED, struct GNUNET_MESH_Tunnel *tunnel,
void **tunnel_ctx 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 TunnelState *state = GNUNET_malloc (sizeof (struct TunnelState));
-
- 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);
+ 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;
- switch (s->addrlen)
+ 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))
{
- case 4:
- prepare_ipv4_packet (len, ntohs (pkt->len), pkt, IPPROTO_UDP, &s->addr,
- tunnel, state, (struct ip4_header *) buf);
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ msg = (const struct GNUNET_EXIT_UdpInternetMessage*) message;
+ pkt_len -= sizeof (struct GNUNET_EXIT_UdpInternetMessage);
+ af = (int) ntohl (msg->af);
+ state->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*) &msg[1];
+ payload = &v4[1];
+ pkt_len -= sizeof (struct in_addr);
+ state->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 in_addr);
+ state->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->ri.remote_address.address,
+ buf, sizeof (buf)),
+ (unsigned int) ntohs (msg->destination_port));
}
- else
- GNUNET_free (state);
-#endif
+ state->ri.remote_address.proto = IPPROTO_UDP;
+ state->ri.remote_address.port = msg->destination_port;
+ if (NULL == state->heap_node)
+ setup_state_record (state);
+ if (0 != ntohs (msg->source_port))
+ state->ri.local_address.port = msg->source_port;
+ send_udp_packet_via_tun (&state->ri.remote_address,
+ &state->ri.local_address,
+ 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
- const GNUNET_HashCode *desc = (const GNUNET_HashCode *) &message[1];
- const struct udp_packet *pkt = (const struct udp_packet *) &desc[1];
+ struct TunnelState *state = *tunnel_ctx;
+ const struct GNUNET_EXIT_UdpServiceMessage *msg;
uint16_t pkt_len = ntohs (message->size);
- struct LocalService *serv;
- struct TunnelState *state;
- struct tunnel_state *s;
- char *buf;
- size_t len;
+ 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_MessageHeader) + sizeof (GNUNET_HashCode) + sizeof (struct udp_packet))
+ if (pkt_len < sizeof (struct GNUNET_EXIT_UdpServiceMessage))
{
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))))
+ msg = (const struct GNUNET_EXIT_UdpServiceMessage*) message;
+ pkt_len -= sizeof (struct GNUNET_EXIT_UdpServiceMessage);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received data from %s for forwarding to UDP service %s on port %u\n",
+ GNUNET_i2s (sender),
+ GNUNET_h2s (&msg->service_descriptor),
+ (unsigned int) ntohs (msg->destination_port));
+ if (NULL == (state->serv = find_service (udp_services, &msg->service_descriptor,
+ ntohs (msg->destination_port))))
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
_("No service found for %s on port %d!\n"),
"UDP",
- ntohs (pkt->dpt));
- return GNUNET_YES;
- }
- pkt->dpt = htons (serv->remote_port);
-
- /* At this point it would be possible to check against some kind of ACL. */
-
- s = GNUNET_MESH_tunnel_get_data (tunnel);
-
-
- /* 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.
- */
-
- state = GNUNET_malloc (sizeof (struct TunnelState));
-
- 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)
- {
- 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;
- }
-
- hash_redirect_info (&state->hash, &state->redirect_info,
- serv->version == 4 ? 4 : 16);
-
- 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);
+ 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->ri.remote_address = state->serv->address;
+ setup_state_record (state);
+ if (0 != ntohs (msg->source_port))
+ state->ri.local_address.port = msg->source_port;
+ send_udp_packet_via_tun (&state->ri.remote_address,
+ &state->ri.local_address,
+ &msg[1], pkt_len);
return GNUNET_YES;
}
-
-
-
-
-
/**
* Callback from GNUNET_MESH for new tunnels.
*
const struct GNUNET_ATS_Information *ats GNUNET_UNUSED)
{
struct TunnelState *s = GNUNET_malloc (sizeof (struct TunnelState));
-
+
+ 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;
}
struct TunnelState *s = tunnel_ctx;
struct TunnelMessageQueue *tnq;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Tunnel destroyed\n");
while (NULL != (tnq = s->head))
{
GNUNET_CONTAINER_DLL_remove (s->head,
{
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;
}
+ if (stats != NULL)
+ {
+ GNUNET_STATISTICS_destroy (stats, GNUNET_YES);
+ stats = NULL;
+ }
for (i=0;i<5;i++)
GNUNET_free_non_null (exit_argv[i]);
}
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_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, 0},
{NULL, 0, 0}
};
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;
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))
+ stats = GNUNET_STATISTICS_create ("exit", cfg);
+ ipv4_exit = GNUNET_CONFIGURATION_get_value_yesno (cfg, "exit", "EXIT_IPV4");
+ ipv6_exit = GNUNET_CONFIGURATION_get_value_yesno (cfg, "exit", "EXIT_IPV6");
+ ipv4_enabled = GNUNET_CONFIGURATION_get_value_yesno (cfg, "exit", "ENABLE_IPV4");
+ ipv6_enabled = GNUNET_CONFIGURATION_get_value_yesno (cfg, "exit", "ENABLE_IPV6");
+ if (ipv4_exit && (! ipv4_enabled))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No entry 'IFNAME' in configuration!\n");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ _("Cannot enable IPv4 exit but disable IPv4 on TUN interface, will use ENABLE_IPv4=YES\n"));
+ ipv4_enabled = GNUNET_YES;
}
- exit_argv[1] = ifname;
- if ( (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV6ADDR",
- &ipv6addr) ||
- (1 != inet_pton (AF_INET6, ipv6addr, &v6))) )
+ if (ipv6_exit && (! ipv6_enabled))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No valid entry 'IPV6ADDR' 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[2] = ipv6addr;
- if (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV6PREFIX",
- &ipv6prefix_s))
+ if (! (ipv4_enabled || ipv6_enabled))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No entry 'IPV6PREFIX' in configuration!\n");
+ _("No useful service enabled. Exiting.\n"));
GNUNET_SCHEDULER_shutdown ();
- return;
+ return;
}
- exit_argv[3] = ipv6prefix_s;
- if ( (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (cfg, "exit",
- "IPV6PREFIX",
- &ipv6prefix)) ||
- (ipv6prefix >= 127) )
+ app_idx = 0;
+ if (GNUNET_YES == ipv4_exit)
{
- GNUNET_SCHEDULER_shutdown ();
- return;
+ apptypes[app_idx] = GNUNET_APPLICATION_TYPE_IPV4_GATEWAY;
+ app_idx++;
}
+ if (GNUNET_YES == ipv6_exit)
+ {
+ apptypes[app_idx] = GNUNET_APPLICATION_TYPE_IPV6_GATEWAY;
+ app_idx++;
+ }
+
+ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleanup, cls);
- if ( (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV4ADDR",
- &ipv4addr) ||
- (1 != inet_pton (AF_INET, ipv4addr, &v4))) )
+ 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 valid entry for 'IPV4ADDR' in configuration!\n");
+ "No entry 'TUN_IFNAME' in configuration!\n");
GNUNET_SCHEDULER_shutdown ();
return;
}
- exit_argv[4] = ipv4addr;
- if ( (GNUNET_SYSERR ==
- GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "IPV4MASK",
- &ipv4mask) ||
- (1 != inet_pton (AF_INET, ipv4mask, &v4))) )
+ exit_argv[1] = tun_ifname;
+ if (ipv4_enabled)
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "No valid entry 'IPV4MASK' in configuration!\n");
- GNUNET_SCHEDULER_shutdown ();
- return;
+ if (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "exit", "EXIT_IFNAME", &exit_ifname))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "No entry 'EXIT_IFNAME' in configuration!\n");
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ exit_argv[2] = exit_ifname;
}
- exit_argv[5] = ipv4mask;
- exit_argv[6] = NULL;
-
- 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++;
- app_idx++;
+ else
+ {
+ exit_argv[2] = GNUNET_strdup ("%");
}
-
- if (GNUNET_YES == tcp)
+ if (GNUNET_YES == ipv6_enabled)
{
- 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++;
- app_idx++;
+ 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);
tcp_services = GNUNET_CONTAINER_multihashmap_create (65536);
GNUNET_CONFIGURATION_iterate_sections (cfg, &read_service_conf, NULL);
GNUNET_SCHEDULER_shutdown ();
return;
}
- helper_handle = GNUNET_HELPER_start ("gnunet-helper-vpn",
+ helper_handle = GNUNET_HELPER_start ("gnunet-helper-exit",
exit_argv,
&message_token, NULL);
}
projects / oweals / gnunet.git / blobdiff