X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet_packet.c;h=d2e9aa816c846a589fa575d1bf996a238b8b0623;hp=25f1d28e8b91a28b76a044173f11e2f6f5af6d49;hb=9bab08e972ae0ca4b904a659d9aed46aaa9b5dd5;hpb=627f7c22b447bd464b536cd016278545674df93d diff --git a/src/net_packet.c b/src/net_packet.c index 25f1d28e..d2e9aa81 100644 --- a/src/net_packet.c +++ b/src/net_packet.c @@ -1,7 +1,7 @@ /* net_packet.c -- Handles in- and outgoing VPN packets - Copyright (C) 1998-2002 Ivo Timmermans , - 2000-2002 Guus Sliepen + Copyright (C) 1998-2003 Ivo Timmermans , + 2000-2003 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -17,416 +17,483 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: net_packet.c,v 1.1.2.17 2002/06/21 10:11:12 guus Exp $ + $Id: net_packet.c,v 1.1.2.46 2003/12/20 21:09:33 guus Exp $ */ -#include "config.h" - -#include -#include -#include -#include -#ifdef HAVE_NETINET_IN_SYSTM_H - #include -#endif -#ifdef HAVE_NETINET_IP_H - #include -#endif -#ifdef HAVE_NETINET_TCP_H - #include -#endif -#include -#include -#include -#include -#include -#include -#include -#include -#include -/* SunOS really wants sys/socket.h BEFORE net/if.h, - and FreeBSD wants these lines below the rest. */ -#include -#include -#include +#include "system.h" #include +#include #include #include #include #include +#include -#include -#include -#include -#include - +#include "avl_tree.h" #include "conf.h" #include "connection.h" -#include "meta.h" +#include "device.h" +#include "event.h" +#include "graph.h" +#include "list.h" +#include "logger.h" #include "net.h" #include "netutl.h" -#include "process.h" #include "protocol.h" -#include "subnet.h" -#include "graph.h" #include "process.h" #include "route.h" -#include "device.h" -#include "event.h" - -#include "system.h" +#include "utils.h" +#include "xalloc.h" int keylifetime = 0; int keyexpires = 0; +EVP_CIPHER_CTX packet_ctx; +static char lzo_wrkmem[LZO1X_999_MEM_COMPRESS > LZO1X_1_MEM_COMPRESS ? LZO1X_999_MEM_COMPRESS : LZO1X_1_MEM_COMPRESS]; + +static void send_udppacket(node_t *, vpn_packet_t *); #define MAX_SEQNO 1073741824 -/* VPN packet I/O */ +void send_mtu_probe(node_t *n) +{ + vpn_packet_t packet; + int len, i; + + cp(); + + n->mtuprobes++; + + if(n->mtuprobes >= 10 && !n->probedmtu) { + ifdebug(TRAFFIC) logger(LOG_INFO, _("No response to MTU probes from %s (%s)"), n->name, n->hostname); + return; + } + + for(i = 0; i < 3; i++) { + if(n->mtuprobes >= 30 || n->probedmtu >= n->mtu) { + n->mtu = n->probedmtu; + ifdebug(TRAFFIC) logger(LOG_INFO, _("Fixing MTU of %s (%s) to %d after %d probes"), n->name, n->hostname, n->mtu, n->mtuprobes); + return; + } + + len = n->probedmtu + 1 + random() % (n->mtu - n->probedmtu); + if(len < 64) + len = 64; + + memset(packet.data, 0, 14); + RAND_pseudo_bytes(packet.data + 14, len - 14); + packet.len = len; + + ifdebug(TRAFFIC) logger(LOG_INFO, _("Sending MTU probe length %d to %s (%s)"), len, n->name, n->hostname); + + send_udppacket(n, &packet); + } + + n->mtuevent = xmalloc(sizeof(*n->mtuevent)); + n->mtuevent->handler = (event_handler_t)send_mtu_probe; + n->mtuevent->data = n; + n->mtuevent->time = now + 1; + event_add(n->mtuevent); +} + +void mtu_probe_h(node_t *n, vpn_packet_t *packet) { + ifdebug(TRAFFIC) logger(LOG_INFO, _("Got MTU probe length %d from %s (%s)"), packet->len, n->name, n->hostname); -void receive_udppacket(node_t *n, vpn_packet_t *inpkt) + if(!packet->data[0]) { + packet->data[0] = 1; + send_packet(n, packet); + } else { + if(n->probedmtu < packet->len) + n->probedmtu = packet->len; + } +} + +static length_t compress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) { - vpn_packet_t pkt1, pkt2; - vpn_packet_t *pkt[] = {&pkt1, &pkt2, &pkt1, &pkt2}; - int nextpkt = 0; - vpn_packet_t *outpkt = pkt[0]; - int outlen, outpad; - long int complen = MTU + 12; - EVP_CIPHER_CTX ctx; - char hmac[EVP_MAX_MD_SIZE]; -cp - /* Check the message authentication code */ - - if(myself->digest && myself->maclength) - { - inpkt->len -= myself->maclength; - HMAC(myself->digest, myself->key, myself->keylength, (char *)&inpkt->seqno, inpkt->len, hmac, NULL); - if(memcmp(hmac, (char *)&inpkt->seqno + inpkt->len, myself->maclength)) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"), n->name, n->hostname); - return; - } - } - - /* Decrypt the packet */ - - if(myself->cipher) - { - outpkt = pkt[nextpkt++]; - - EVP_DecryptInit(&ctx, myself->cipher, myself->key, myself->key + myself->cipher->key_len); - EVP_DecryptUpdate(&ctx, (char *)&outpkt->seqno, &outlen, (char *)&inpkt->seqno, inpkt->len); - EVP_DecryptFinal(&ctx, (char *)&outpkt->seqno + outlen, &outpad); - - outpkt->len = outlen + outpad; - inpkt = outpkt; - } - - /* Check the sequence number */ - - inpkt->len -= sizeof(inpkt->seqno); - inpkt->seqno = ntohl(inpkt->seqno); - - if(inpkt->seqno <= n->received_seqno) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Got late or replayed packet from %s (%s), seqno %d"), n->name, n->hostname, inpkt->seqno); - return; - } - - n->received_seqno = inpkt->seqno; - - if(n->received_seqno > MAX_SEQNO) - keyexpires = 0; - - /* Decompress the packet */ - - if(myself->compression) - { - outpkt = pkt[nextpkt++]; - - if(uncompress(outpkt->data, &complen, inpkt->data, inpkt->len) != Z_OK) - { - syslog(LOG_ERR, _("Error while uncompressing packet from %s (%s)"), n->name, n->hostname); - return; - } - - outpkt->len = complen; - inpkt = outpkt; - } - - receive_packet(n, inpkt); -cp + if(level == 10) { + lzo_uint lzolen = MAXSIZE; + lzo1x_1_compress(source, len, dest, &lzolen, lzo_wrkmem); + return lzolen; + } else if(level < 10) { + unsigned long destlen = MAXSIZE; + if(compress2(dest, &destlen, source, len, level) == Z_OK) + return destlen; + else + return -1; + } else { + lzo_uint lzolen = MAXSIZE; + lzo1x_999_compress(source, len, dest, &lzolen, lzo_wrkmem); + return lzolen; + } + + return -1; } -void receive_tcppacket(connection_t *c, char *buffer, int len) +static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t len, int level) { - vpn_packet_t outpkt; -cp - outpkt.len = len; - memcpy(outpkt.data, buffer, len); + if(level > 9) { + lzo_uint lzolen = MAXSIZE; + if(lzo1x_decompress_safe(source, len, dest, &lzolen, NULL) == LZO_E_OK) + return lzolen; + else + return -1; + } else { + unsigned long destlen = MAXSIZE; + if(uncompress(dest, &destlen, source, len) == Z_OK) + return destlen; + else + return -1; + } + + return -1; +} + +/* VPN packet I/O */ + +static void receive_packet(node_t *n, vpn_packet_t *packet) +{ + cp(); + + ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), + packet->len, n->name, n->hostname); + + route(n, packet); +} - receive_packet(c->node, &outpkt); -cp +static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) +{ + vpn_packet_t pkt1, pkt2; + vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 }; + int nextpkt = 0; + vpn_packet_t *outpkt = pkt[0]; + int outlen, outpad; + char hmac[EVP_MAX_MD_SIZE]; + int i; + + cp(); + + /* Check packet length */ + + if(inpkt->len < sizeof(inpkt->seqno) + myself->maclength) { + ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got too short packet from %s (%s)"), + n->name, n->hostname); + return; + } + + /* Check the message authentication code */ + + if(myself->digest && myself->maclength) { + inpkt->len -= myself->maclength; + HMAC(myself->digest, myself->key, myself->keylength, + (char *) &inpkt->seqno, inpkt->len, hmac, NULL); + + if(memcmp(hmac, (char *) &inpkt->seqno + inpkt->len, myself->maclength)) { + ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"), + n->name, n->hostname); + return; + } + } + + /* Decrypt the packet */ + + if(myself->cipher) { + outpkt = pkt[nextpkt++]; + + if(!EVP_DecryptInit_ex(&packet_ctx, NULL, NULL, NULL, NULL) + || !EVP_DecryptUpdate(&packet_ctx, (char *) &outpkt->seqno, &outlen, + (char *) &inpkt->seqno, inpkt->len) + || !EVP_DecryptFinal_ex(&packet_ctx, (char *) &outpkt->seqno + outlen, &outpad)) { + ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Error decrypting packet from %s (%s): %s"), + n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL)); + return; + } + + outpkt->len = outlen + outpad; + inpkt = outpkt; + } + + /* Check the sequence number */ + + inpkt->len -= sizeof(inpkt->seqno); + inpkt->seqno = ntohl(inpkt->seqno); + + if(inpkt->seqno != n->received_seqno + 1) { + if(inpkt->seqno >= n->received_seqno + sizeof(n->late) * 8) { + logger(LOG_WARNING, _("Lost %d packets from %s (%s)"), + inpkt->seqno - n->received_seqno - 1, n->name, n->hostname); + + memset(n->late, 0, sizeof(n->late)); + } else if (inpkt->seqno <= n->received_seqno) { + if(inpkt->seqno <= n->received_seqno - sizeof(n->late) * 8 || !(n->late[(inpkt->seqno / 8) % sizeof(n->late)] & (1 << inpkt->seqno % 8))) { + logger(LOG_WARNING, _("Got late or replayed packet from %s (%s), seqno %d, last received %d"), + n->name, n->hostname, inpkt->seqno, n->received_seqno); + } else + for(i = n->received_seqno + 1; i < inpkt->seqno; i++) + n->late[(inpkt->seqno / 8) % sizeof(n->late)] |= 1 << i % 8; + } + } + + n->received_seqno = inpkt->seqno; + n->late[(n->received_seqno / 8) % sizeof(n->late)] &= ~(1 << n->received_seqno % 8); + + if(n->received_seqno > MAX_SEQNO) + keyexpires = 0; + + /* Decompress the packet */ + + if(myself->compression) { + outpkt = pkt[nextpkt++]; + + if((outpkt->len = uncompress_packet(outpkt->data, inpkt->data, inpkt->len, myself->compression)) < 0) { + ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while uncompressing packet from %s (%s)"), + n->name, n->hostname); + return; + } + + inpkt = outpkt; + } + + if(n->connection) + n->connection->last_ping_time = now; + + if(!inpkt->data[12] && !inpkt->data[13]) + mtu_probe_h(n, inpkt); + else + receive_packet(n, inpkt); } -void receive_packet(node_t *n, vpn_packet_t *packet) +void receive_tcppacket(connection_t *c, char *buffer, int len) { -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), packet->len, n->name, n->hostname); + vpn_packet_t outpkt; + + cp(); + + outpkt.len = len; + memcpy(outpkt.data, buffer, len); - route_incoming(n, packet); -cp + receive_packet(c->node, &outpkt); } -void send_udppacket(node_t *n, vpn_packet_t *inpkt) +static void send_udppacket(node_t *n, vpn_packet_t *inpkt) { - vpn_packet_t pkt1, pkt2; - vpn_packet_t *pkt[] = {&pkt1, &pkt2, &pkt1, &pkt2}; - int nextpkt = 0; - vpn_packet_t *outpkt; - int origlen; - int outlen, outpad; - long int complen = MTU + 12; - EVP_CIPHER_CTX ctx; - vpn_packet_t *copy; - static int priority = 0; - int origpriority; - int sock; -cp - /* Make sure we have a valid key */ + vpn_packet_t pkt1, pkt2; + vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 }; + int nextpkt = 0; + vpn_packet_t *outpkt; + int origlen; + int outlen, outpad; + vpn_packet_t *copy; + static int priority = 0; + int origpriority; + int sock; + + cp(); + + /* Make sure we have a valid key */ + + if(!n->status.validkey) { + ifdebug(TRAFFIC) logger(LOG_INFO, + _("No valid key known yet for %s (%s), queueing packet"), + n->name, n->hostname); + + /* Since packet is on the stack of handle_tap_input(), we have to make a copy of it first. */ - if(!n->status.validkey) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"), - n->name, n->hostname); + *(copy = xmalloc(sizeof(*copy))) = *inpkt; - /* Since packet is on the stack of handle_tap_input(), - we have to make a copy of it first. */ + list_insert_tail(n->queue, copy); - copy = xmalloc(sizeof(vpn_packet_t)); - memcpy(copy, inpkt, sizeof(vpn_packet_t)); + if(n->queue->count > MAXQUEUELENGTH) + list_delete_head(n->queue); - list_insert_tail(n->queue, copy); + if(!n->status.waitingforkey) + send_req_key(n->nexthop->connection, myself, n); - if(n->queue->count > MAXQUEUELENGTH) - list_delete_head(n->queue); + n->status.waitingforkey = true; - if(!n->status.waitingforkey) - send_req_key(n->nexthop->connection, myself, n); + return; + } - n->status.waitingforkey = 1; + origlen = inpkt->len; + origpriority = inpkt->priority; - return; - } + /* Compress the packet */ - origlen = inpkt->len; - origpriority = inpkt->priority; + if(n->compression) { + outpkt = pkt[nextpkt++]; - /* Compress the packet */ + if((outpkt->len = compress_packet(outpkt->data, inpkt->data, inpkt->len, n->compression)) < 0) { + ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while compressing packet to %s (%s)"), + n->name, n->hostname); + return; + } - if(n->compression) - { - outpkt = pkt[nextpkt++]; + inpkt = outpkt; + } - if(compress2(outpkt->data, &complen, inpkt->data, inpkt->len, n->compression) != Z_OK) - { - syslog(LOG_ERR, _("Error while compressing packet to %s (%s)"), n->name, n->hostname); - return; - } - - outpkt->len = complen; - inpkt = outpkt; - } + /* Add sequence number */ - /* Add sequence number */ + inpkt->seqno = htonl(++(n->sent_seqno)); + inpkt->len += sizeof(inpkt->seqno); - inpkt->seqno = htonl(++(n->sent_seqno)); - inpkt->len += sizeof(inpkt->seqno); + /* Encrypt the packet */ - /* Encrypt the packet */ + if(n->cipher) { + outpkt = pkt[nextpkt++]; - if(n->cipher) - { - outpkt = pkt[nextpkt++]; + if(!EVP_EncryptInit_ex(&n->packet_ctx, NULL, NULL, NULL, NULL) + || !EVP_EncryptUpdate(&n->packet_ctx, (char *) &outpkt->seqno, &outlen, + (char *) &inpkt->seqno, inpkt->len) + || !EVP_EncryptFinal_ex(&n->packet_ctx, (char *) &outpkt->seqno + outlen, &outpad)) { + ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while encrypting packet to %s (%s): %s"), + n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL)); + return; + } - EVP_EncryptInit(&ctx, n->cipher, n->key, n->key + n->cipher->key_len); - EVP_EncryptUpdate(&ctx, (char *)&outpkt->seqno, &outlen, (char *)&inpkt->seqno, inpkt->len); - EVP_EncryptFinal(&ctx, (char *)&outpkt->seqno + outlen, &outpad); + outpkt->len = outlen + outpad; + inpkt = outpkt; + } - outpkt->len = outlen + outpad; - inpkt = outpkt; - } + /* Add the message authentication code */ - /* Add the message authentication code */ + if(n->digest && n->maclength) { + HMAC(n->digest, n->key, n->keylength, (char *) &inpkt->seqno, + inpkt->len, (char *) &inpkt->seqno + inpkt->len, &outlen); + inpkt->len += n->maclength; + } - if(n->digest && n->maclength) - { - HMAC(n->digest, n->key, n->keylength, (char *)&inpkt->seqno, inpkt->len, (char *)&inpkt->seqno + inpkt->len, &outlen); - inpkt->len += n->maclength; - } + /* Determine which socket we have to use */ - /* Determine which socket we have to use */ + for(sock = 0; sock < listen_sockets; sock++) + if(n->address.sa.sa_family == listen_socket[sock].sa.sa.sa_family) + break; - for(sock = 0; sock < listen_sockets; sock++) - if(n->address.sa.sa_family == listen_socket[sock].sa.sa.sa_family) - break; + if(sock >= listen_sockets) + sock = 0; /* If none is available, just use the first and hope for the best. */ - if(sock >= listen_sockets) - sock = 0; /* If none is available, just use the first and hope for the best. */ - - /* Send the packet */ + /* Send the packet */ #if defined(SOL_IP) && defined(IP_TOS) - if(priorityinheritance && origpriority != priority && listen_socket[sock].sa.sa.sa_family == AF_INET) - { - priority = origpriority; - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Setting outgoing packet priority to %d"), priority); - if(setsockopt(sock, SOL_IP, IP_TOS, &priority, sizeof(priority))) /* SO_PRIORITY doesn't seem to work */ - syslog(LOG_ERR, _("System call `%s' failed: %s"), "setsockopt", strerror(errno)); - } + if(priorityinheritance && origpriority != priority + && listen_socket[sock].sa.sa.sa_family == AF_INET) { + priority = origpriority; + ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Setting outgoing packet priority to %d"), priority); + if(setsockopt(listen_socket[sock].udp, SOL_IP, IP_TOS, &priority, sizeof(priority))) /* SO_PRIORITY doesn't seem to work */ + logger(LOG_ERR, _("System call `%s' failed: %s"), "setsockopt", strerror(errno)); + } #endif - if((sendto(listen_socket[sock].udp, (char *)&inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa))) < 0) - { - syslog(LOG_ERR, _("Error sending packet to %s (%s): %s"), - n->name, n->hostname, strerror(errno)); - return; - } - - inpkt->len = origlen; -cp + if((sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa))) < 0) { + logger(LOG_ERR, _("Error sending packet to %s (%s): %s"), n->name, n->hostname, strerror(errno)); + if(errno == EMSGSIZE) { + if(n->mtu >= origlen) + n->mtu = origlen - 1; + } + return; + } + + inpkt->len = origlen; } /* send a packet to the given vpn ip. */ -void send_packet(node_t *n, vpn_packet_t *packet) +void send_packet(const node_t *n, vpn_packet_t *packet) { - node_t *via; -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), - packet->len, n->name, n->hostname); - - if(n == myself) - { - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_NOTICE, _("Packet is looping back to us!")); - } - - return; - } - - if(!n->status.reachable) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("Node %s (%s) is not reachable"), - n->name, n->hostname); - return; - } - - via = (n->via == myself)?n->nexthop:n->via; - - if(via != n && debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_ERR, _("Sending packet to %s via %s (%s)"), - n->name, via->name, n->via->hostname); - - if((myself->options | via->options) & OPTION_TCPONLY) - { - if(send_tcppacket(via->connection, packet)) - terminate_connection(via->connection, 1); - } - else - send_udppacket(via, packet); + node_t *via; + + cp(); + + if(n == myself) { + write_packet(packet); + return; + } + + ifdebug(TRAFFIC) logger(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), + packet->len, n->name, n->hostname); + + if(!n->status.reachable) { + ifdebug(TRAFFIC) logger(LOG_INFO, _("Node %s (%s) is not reachable"), + n->name, n->hostname); + return; + } + + via = (n->via == myself) ? n->nexthop : n->via; + + if(via != n) + ifdebug(TRAFFIC) logger(LOG_ERR, _("Sending packet to %s via %s (%s)"), + n->name, via->name, n->via->hostname); + + if((myself->options | via->options) & OPTION_TCPONLY) { + if(!send_tcppacket(via->connection, packet)) + terminate_connection(via->connection, true); + } else + send_udppacket(via, packet); } /* Broadcast a packet using the minimum spanning tree */ -void broadcast_packet(node_t *from, vpn_packet_t *packet) +void broadcast_packet(const node_t *from, vpn_packet_t *packet) { - avl_node_t *node; - connection_t *c; -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"), - packet->len, from->name, from->hostname); - - for(node = connection_tree->head; node; node = node->next) - { - c = (connection_t *)node->data; - if(c->status.active && c->status.mst && c != from->nexthop->connection) - send_packet(c->node, packet); - } -cp + avl_node_t *node; + connection_t *c; + + cp(); + + ifdebug(TRAFFIC) logger(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"), + packet->len, from->name, from->hostname); + + for(node = connection_tree->head; node; node = node->next) { + c = node->data; + + if(c->status.active && c->status.mst && c != from->nexthop->connection) + send_packet(c->node, packet); + } } void flush_queue(node_t *n) { - list_node_t *node, *next; -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname); - - for(node = n->queue->head; node; node = next) - { - next = node->next; - send_udppacket(n, (vpn_packet_t *)node->data); - list_delete_node(n->queue, node); - } -cp + list_node_t *node, *next; + + cp(); + + ifdebug(TRAFFIC) logger(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname); + + for(node = n->queue->head; node; node = next) { + next = node->next; + send_udppacket(n, node->data); + list_delete_node(n->queue, node); + } } void handle_incoming_vpn_data(int sock) { - vpn_packet_t pkt; - int x, l = sizeof(x); - char *hostname; - sockaddr_t from; - socklen_t fromlen = sizeof(from); - node_t *n; -cp - if(getsockopt(sock, SOL_SOCKET, SO_ERROR, &x, &l) < 0) - { - syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%s"), - __FILE__, __LINE__, sock, strerror(errno)); - cp_trace(); - exit(1); - } - if(x) - { - syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x)); - return; - } - - if((pkt.len = recvfrom(sock, (char *)&pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen)) <= 0) - { - syslog(LOG_ERR, _("Receiving packet failed: %s"), strerror(errno)); - return; - } - - sockaddrunmap(&from); /* Some braindead IPv6 implementations do stupid things. */ - - n = lookup_node_udp(&from); - - if(!n) - { - hostname = sockaddr2hostname(&from); - syslog(LOG_WARNING, _("Received UDP packet from unknown source %s"), hostname); - free(hostname); - return; - } - - if(n->connection) - n->connection->last_ping_time = now; - - receive_udppacket(n, &pkt); -cp -} + vpn_packet_t pkt; + char *hostname; + sockaddr_t from; + socklen_t fromlen = sizeof(from); + node_t *n; + cp(); + + pkt.len = recvfrom(sock, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen); + + if(pkt.len < 0) { + logger(LOG_ERR, _("Receiving packet failed: %s"), strerror(errno)); + return; + } + + sockaddrunmap(&from); /* Some braindead IPv6 implementations do stupid things. */ + + n = lookup_node_udp(&from); + + if(!n) { + hostname = sockaddr2hostname(&from); + logger(LOG_WARNING, _("Received UDP packet from unknown source %s"), + hostname); + free(hostname); + return; + } + + receive_udppacket(n, &pkt); +}