X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet.c;h=b52412d8f5a10e6b6cecc4365e1b592ee8c16a28;hp=3c884782152b7b66445b58123e88131c44a85f93;hb=1708997bc8ab55122f9de9cc8b81397d3a003ea9;hpb=cc01b18bc6d0bfb12e6770fc0a007c278f355d9e diff --git a/src/net.c b/src/net.c index 3c884782..71829534 100644 --- a/src/net.c +++ b/src/net.c @@ -1,6 +1,7 @@ /* net.c -- most of the network code - Copyright (C) 1998,1999,2000 Ivo Timmermans + Copyright (C) 1998-2002 Ivo Timmermans , + 2000-2002 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 @@ -15,245 +16,215 @@ You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id: net.c,v 1.35.4.153 2002/02/11 14:20:21 guus Exp $ */ #include "config.h" -#include #include #include #include #include +#ifdef HAVE_LINUX + #include + #include +#endif #include #include #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 +#include +#include +#include + +#ifndef HAVE_RAND_PSEUDO_BYTES +#define RAND_pseudo_bytes RAND_bytes +#endif -#include #include #include +#include +#include #include "conf.h" -#include "encr.h" +#include "connection.h" +#include "meta.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" -int tap_fd = -1; +#include "system.h" -int total_tap_in = 0; -int total_tap_out = 0; -int total_socket_in = 0; -int total_socket_out = 0; +int maxtimeout = 900; +int seconds_till_retry = 5; -static int seconds_till_retry; +int tcp_socket = -1; +int udp_socket = -1; -/* The global list of existing connections */ -conn_list_t *conn_list = NULL; -conn_list_t *myself = NULL; +int keylifetime = 0; +int keyexpires = 0; -/* - strip off the MAC adresses of an ethernet frame -*/ -void strip_mac_addresses(vpn_packet_t *p) -{ - unsigned char tmp[MAXSIZE]; -cp - memcpy(tmp, p->data, p->len); - p->len -= 12; - memcpy(p->data, &tmp[12], p->len); -cp -} +int do_prune = 0; +int do_purge = 0; +int sighup = 0; +int sigalrm = 0; -/* - reassemble MAC addresses -*/ -void add_mac_addresses(vpn_packet_t *p) -{ - unsigned char tmp[MAXSIZE]; -cp - memcpy(&tmp[12], p->data, p->len); - p->len += 12; - tmp[0] = tmp[6] = 0xfe; - tmp[1] = tmp[7] = 0xfd; - *((ip_t*)(&tmp[2])) = (ip_t)(htonl(myself->vpn_ip)); - *((ip_t*)(&tmp[8])) = *((ip_t*)(&tmp[26])); - memcpy(p->data, &tmp[0], p->len); -cp -} +#define MAX_SEQNO 1073741824 + +/* VPN packet I/O */ -int xsend(conn_list_t *cl, void *packet) +void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { - int r; - real_packet_t rp; + vpn_packet_t outpkt; + int outlen, outpad; + EVP_CIPHER_CTX ctx; + char hmac[EVP_MAX_MD_SIZE]; cp - do_encrypt((vpn_packet_t*)packet, &rp, cl->key); - rp.from = htonl(myself->vpn_ip); - rp.data.len = htons(rp.data.len); - rp.len = htons(rp.len); - - if(debug_lvl > 3) - syslog(LOG_ERR, "Sent %d bytes to %lx", ntohs(rp.len), cl->vpn_ip); - if((r = send(cl->socket, (char*)&rp, ntohs(rp.len), 0)) < 0) + if(myself->digest && myself->maclength) { - syslog(LOG_ERR, "Error sending data: %m"); - return -1; + 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)) + { + syslog(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"), n->name, n->hostname); + return; + } } - total_socket_out += r; - - cl->want_ping = 1; -cp - return 0; -} - -int xrecv(conn_list_t *cl, void *packet) -{ - vpn_packet_t vp; - int lenin; -cp - do_decrypt((real_packet_t*)packet, &vp, cl->key); - add_mac_addresses(&vp); + /* Decrypt the packet */ - if((lenin = write(tap_fd, &vp, vp.len + sizeof(vp.len))) < 0) - syslog(LOG_ERR, "Can't write to tap device: %m"); + if(myself->cipher) + { + 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); + outlen += outpad; + outpkt.len = outlen - sizeof(outpkt.seqno); + } else - total_tap_out += lenin; + { + memcpy((char *)&outpkt.seqno, (char *)&inpkt->seqno, inpkt->len); + outpkt.len = inpkt->len - sizeof(outpkt.seqno); + } + + if (ntohl(outpkt.seqno) <= n->received_seqno) + { + syslog(LOG_DEBUG, _("Got late or replayed packet from %s (%s), seqno %d"), n->name, n->hostname, ntohl(*(unsigned int *)&outpkt.seqno)); + return; + } + + n->received_seqno = ntohl(outpkt.seqno); - cl->want_ping = 0; - cl->last_ping_time = time(NULL); + if(n->received_seqno > MAX_SEQNO) + keyexpires = 0; + + receive_packet(n, &outpkt); cp - return 0; } -/* - add the given packet of size s to the - queue q, be it the send or receive queue -*/ -void add_queue(packet_queue_t **q, void *packet, size_t s) +void receive_tcppacket(connection_t *c, char *buffer, int len) { - queue_element_t *e; + vpn_packet_t outpkt; cp - if(debug_lvl > 3) - syslog(LOG_DEBUG, "packet to queue: %d", s); - - e = xmalloc(sizeof(*e)); - e->packet = xmalloc(s); - memcpy(e->packet, packet, s); - - if(!*q) - { - *q = xmalloc(sizeof(**q)); - (*q)->head = (*q)->tail = NULL; - } - - e->next = NULL; /* We insert at the tail */ - - if((*q)->tail) /* Do we have a tail? */ - { - (*q)->tail->next = e; - e->prev = (*q)->tail; - } - else /* No tail -> no head too */ - { - (*q)->head = e; - e->prev = NULL; - } + outpkt.len = len; + memcpy(outpkt.data, buffer, len); - (*q)->tail = e; + receive_packet(c->node, &outpkt); cp } -/* Remove a queue element */ -void del_queue(packet_queue_t **q, queue_element_t *e) +void receive_packet(node_t *n, vpn_packet_t *packet) { cp - free(e->packet); + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), packet->len, n->name, n->hostname); - if(e->next) /* There is a successor, so we are not tail */ - { - if(e->prev) /* There is a predecessor, so we are not head */ - { - e->next->prev = e->prev; - e->prev->next = e->next; - } - else /* We are head */ - { - e->next->prev = NULL; - (*q)->head = e->next; - } - } - else /* We are tail (or all alone!) */ - { - if(e->prev) /* We are not alone :) */ - { - e->prev->next = NULL; - (*q)->tail = e->prev; - } - else /* Adieu */ - { - free(*q); - *q = NULL; - } - } - - free(e); + route_incoming(n, packet); cp } -/* - flush a queue by calling function for - each packet, and removing it when that - returned a zero exit code -*/ -void flush_queue(conn_list_t *cl, packet_queue_t **pq, - int (*function)(conn_list_t*,void*)) +void send_udppacket(node_t *n, vpn_packet_t *inpkt) { - queue_element_t *p, *next = NULL; + vpn_packet_t outpkt; + int outlen, outpad; + EVP_CIPHER_CTX ctx; + struct sockaddr_in to; + socklen_t tolen = sizeof(to); + vpn_packet_t *copy; cp - for(p = (*pq)->head; p != NULL; ) + if(!n->status.validkey) { - next = p->next; + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(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. */ + + copy = xmalloc(sizeof(vpn_packet_t)); + memcpy(copy, inpkt, sizeof(vpn_packet_t)); + + list_insert_tail(n->queue, copy); - if(!function(cl, p->packet)) - del_queue(pq, p); - - p = next; + if(!n->status.waitingforkey) + send_req_key(n->nexthop->connection, myself, n); + return; } - if(debug_lvl > 3) - syslog(LOG_DEBUG, "queue flushed"); -cp -} + /* Encrypt the packet. */ -/* - flush the send&recv queues - void because nothing goes wrong here, packets - remain in the queue if something goes wrong -*/ -void flush_queues(conn_list_t *cl) -{ -cp - if(cl->sq) + inpkt->seqno = htonl(++(n->sent_seqno)); + + if(n->cipher) + { + 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 + sizeof(inpkt->seqno)); + EVP_EncryptFinal(&ctx, (char *)&outpkt.seqno + outlen, &outpad); + outlen += outpad; + } + else + { + memcpy((char *)&outpkt.seqno, (char *)&inpkt->seqno, inpkt->len + sizeof(inpkt->seqno)); + outlen = inpkt->len + sizeof(inpkt->seqno); + } + + if(n->digest && n->maclength) { - if(debug_lvl > 1) - syslog(LOG_DEBUG, "Flushing send queue for " IP_ADDR_S, - IP_ADDR_V(cl->vpn_ip)); - flush_queue(cl, &(cl->sq), xsend); + HMAC(n->digest, n->key, n->keylength, (char *)&outpkt.seqno, outlen, (char *)&outpkt.seqno + outlen, &outpad); + outlen += n->maclength; } - if(cl->rq) + to.sin_family = AF_INET; + to.sin_addr.s_addr = htonl(n->address); + to.sin_port = htons(n->port); + + if((sendto(udp_socket, (char *)&outpkt.seqno, outlen, 0, (const struct sockaddr *)&to, tolen)) < 0) { - if(debug_lvl > 1) - syslog(LOG_DEBUG, "Flushing receive queue for " IP_ADDR_S, - IP_ADDR_V(cl->vpn_ip)); - flush_queue(cl, &(cl->rq), xrecv); + syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"), + n->name, n->hostname); + return; } cp } @@ -261,133 +232,160 @@ cp /* send a packet to the given vpn ip. */ -int send_packet(ip_t to, vpn_packet_t *packet) +void send_packet(node_t *n, vpn_packet_t *packet) { - conn_list_t *cl; + node_t *via; cp - if((cl = lookup_conn(to)) == NULL) + 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 > 2) + if(debug_lvl >= DEBUG_TRAFFIC) { - syslog(LOG_NOTICE, "trying to look up " IP_ADDR_S " in connection list failed.", - IP_ADDR_V(to)); - } - for(cl = conn_list; cl != NULL && !cl->status.outgoing; cl = cl->next); - if(!cl) - { /* No open outgoing connection has been found. */ - if(debug_lvl > 2) - syslog(LOG_NOTICE, "There is no remote host I can send this packet to."); - return -1; + 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; } - if(my_key_expiry <= time(NULL)) - regenerate_keys(); + via = (n->via == myself)?n->nexthop:n->via; - if(!cl->status.dataopen) - if(setup_vpn_connection(cl) < 0) - return -1; + 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(!cl->status.validkey) + if((myself->options | via->options) & OPTION_TCPONLY) { - add_queue(&(cl->sq), packet, packet->len + 2); - if(!cl->status.waitingforkey) - send_key_request(cl->vpn_ip); /* Keys should be sent to the host running the tincd */ - return 0; + if(send_tcppacket(via->connection, packet)) + terminate_connection(via->connection, 1); } + else + send_udppacket(via, packet); +} - if(!cl->status.active) +/* Broadcast a packet using the minimum spanning tree */ + +void broadcast_packet(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) { - add_queue(&(cl->sq), packet, packet->len + 2); - if(debug_lvl > 1) - syslog(LOG_INFO, IP_ADDR_S " is not ready, queueing packet.", IP_ADDR_V(cl->vpn_ip)); - return 0; /* We don't want to mess up, do we? */ + c = (connection_t *)node->data; + if(c->status.active && c->status.mst && c != from->nexthop->connection) + send_packet(c->node, packet); } - - /* can we send it? can we? can we? huh? */ cp - return xsend(cl, packet); } -/* - open the local ethertap device -*/ -int setup_tap_fd(void) +void flush_queue(node_t *n) { - int nfd; - const char *tapfname; - config_t const *cfg; -cp - if((cfg = get_config_val(tapdevice)) == NULL) - tapfname = "/dev/tap0"; - else - tapfname = cfg->data.ptr; + list_node_t *node, *next; +cp + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname); - if((nfd = open(tapfname, O_RDWR | O_NONBLOCK)) < 0) + for(node = n->queue->head; node; node = next) { - syslog(LOG_ERR, "Could not open %s: %m", tapfname); - return -1; + next = node->next; + send_udppacket(n, (vpn_packet_t *)node->data); + list_delete_node(n->queue, node); } - - tap_fd = nfd; cp - return 0; } -/* - set up the socket that we listen on for incoming - (tcp) connections -*/ -int setup_listen_meta_socket(int port) +/* Setup sockets */ + +int setup_listen_socket(port_t port) { int nfd, flags; struct sockaddr_in a; - const int one = 1; + int option; + ipv4_t *address; +#ifdef HAVE_LINUX + char *interface; +#endif cp if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) { - syslog(LOG_ERR, "Creating metasocket failed: %m"); - return -1; - } - - if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) - { - syslog(LOG_ERR, "setsockopt: %m"); + syslog(LOG_ERR, _("Creating metasocket failed: %m")); return -1; } flags = fcntl(nfd, F_GETFL); if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) { - syslog(LOG_ERR, "fcntl: %m"); + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "fcntl"); return -1; } + /* Optimize TCP settings */ + + option = 1; + setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option)); + setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option)); +#ifdef HAVE_LINUX + setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); + + option = IPTOS_LOWDELAY; + setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option)); + + if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface)) + if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface))) + { + close(nfd); + syslog(LOG_ERR, _("Can't bind to interface %s: %m"), interface); + return -1; + } +#endif + memset(&a, 0, sizeof(a)); a.sin_family = AF_INET; - a.sin_port = htons(port); a.sin_addr.s_addr = htonl(INADDR_ANY); + a.sin_port = htons(port); + + if(get_config_address(lookup_config(config_tree, "BindToAddress"), &address)) + { + a.sin_addr.s_addr = htonl(*address); + free(address); + } if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr))) { - syslog(LOG_ERR, "Can't bind to port %hd/tcp: %m", port); + close(nfd); + syslog(LOG_ERR, _("Can't bind to port %hd/tcp: %m"), port); return -1; } if(listen(nfd, 3)) { - syslog(LOG_ERR, "listen: %m"); + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "listen"); return -1; } cp return nfd; } -/* - setup the socket for incoming encrypted - data (the udp part) -*/ -int setup_vpn_in_socket(int port) +int setup_vpn_in_socket(port_t port) { int nfd, flags; struct sockaddr_in a; @@ -395,20 +393,19 @@ int setup_vpn_in_socket(int port) cp if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { - syslog(LOG_ERR, "Creating socket failed: %m"); + close(nfd); + syslog(LOG_ERR, _("Creating socket failed: %m")); return -1; } - if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) - { - syslog(LOG_ERR, "setsockopt: %m"); - return -1; - } + setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); flags = fcntl(nfd, F_GETFL); if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) { - syslog(LOG_ERR, "fcntl: %m"); + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "fcntl"); return -1; } @@ -419,301 +416,631 @@ cp if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr))) { - syslog(LOG_ERR, "Can't bind to port %hd/udp: %m", port); + close(nfd); + syslog(LOG_ERR, _("Can't bind to port %hd/udp: %m"), port); return -1; } cp return nfd; } -/* - setup an outgoing meta (tcp) socket -*/ -int setup_outgoing_meta_socket(conn_list_t *cl) +void retry_outgoing(outgoing_t *outgoing) +{ + event_t *event; +cp + outgoing->timeout += 5; + if(outgoing->timeout > maxtimeout) + outgoing->timeout = maxtimeout; + + event = new_event(); + event->handler = (event_handler_t)setup_outgoing_connection; + event->time = time(NULL) + outgoing->timeout; + event->data = outgoing; + event_add(event); + + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in %d seconds"), outgoing->timeout); +cp +} + +int setup_outgoing_socket(connection_t *c) { int flags; struct sockaddr_in a; - config_t const *cfg; cp - if((cfg = get_config_val(upstreamport)) == NULL) - cl->port = 655; - else - cl->port = cfg->data.val; + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname); - cl->meta_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); - if(cl->meta_socket == -1) + c->socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); + + if(c->socket == -1) { - syslog(LOG_ERR, "Creating socket failed: %m"); + syslog(LOG_ERR, _("Creating socket for %s port %d failed: %m"), + c->hostname, c->port); return -1; } + /* Bind first to get a fix on our source port??? + a.sin_family = AF_INET; - a.sin_port = htons(cl->port); - a.sin_addr.s_addr = htonl(cl->real_ip); + a.sin_port = htons(0); + a.sin_addr.s_addr = htonl(INADDR_ANY); - if(connect(cl->meta_socket, (struct sockaddr *)&a, sizeof(a)) == -1) + if(bind(c->socket, (struct sockaddr *)&a, sizeof(struct sockaddr))) { - syslog(LOG_ERR, IP_ADDR_S ":%d: %m", IP_ADDR_V(cl->real_ip), cl->port); + close(c->socket); + syslog(LOG_ERR, _("System call `%s' failed: %m"), "bind"); return -1; } - flags = fcntl(cl->meta_socket, F_GETFL); - if(fcntl(cl->meta_socket, F_SETFL, flags | O_NONBLOCK) < 0) + */ + + /* Optimize TCP settings? + + option = 1; + setsockopt(c->socket, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option)); +#ifdef HAVE_LINUX + setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); + + option = IPTOS_LOWDELAY; + setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option)); +#endif + + */ + + /* Connect */ + + a.sin_family = AF_INET; + a.sin_port = htons(c->port); + a.sin_addr.s_addr = htonl(c->address); + + if(connect(c->socket, (struct sockaddr *)&a, sizeof(a)) == -1) { - syslog(LOG_ERR, "fcntl: %m"); + close(c->socket); + syslog(LOG_ERR, _("%s port %hd: %m"), c->hostname, c->port); return -1; } - cl->hostname = hostlookup(htonl(cl->real_ip)); - - syslog(LOG_INFO, "Connected to %s:%hd" , cl->hostname, cl->port); -cp - return 0; -} - -/* - setup an outgoing connection. It's not - necessary to also open an udp socket as - well, because the other host will initiate - an authentication sequence during which - we will do just that. -*/ -int setup_outgoing_connection(ip_t ip) -{ - conn_list_t *ncn; -cp - ncn = new_conn_list(); - ncn->real_ip = ip; + flags = fcntl(c->socket, F_GETFL); - if(setup_outgoing_meta_socket(ncn) < 0) + if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) { - syslog(LOG_ERR, "Could not set up a meta connection."); - free_conn_element(ncn); + close(c->socket); + syslog(LOG_ERR, _("fcntl for %s port %d: %m"), + c->hostname, c->port); return -1; } - ncn->status.meta = 1; - ncn->status.outgoing = 1; - ncn->next = conn_list; - conn_list = ncn; + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_INFO, _("Connected to %s port %hd"), + c->hostname, c->port); cp return 0; } -/* - set up the local sockets (listen only) -*/ -int setup_myself(void) +void setup_outgoing_connection(outgoing_t *outgoing) { - config_t const *cfg; + connection_t *c; + node_t *n; + struct hostent *h; cp - myself = new_conn_list(); + n = lookup_node(outgoing->name); + + if(n) + if(n->connection) + { + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_INFO, _("Already connected to %s"), outgoing->name); + n->connection->outgoing = outgoing; + return; + } - if(!(cfg = get_config_val(myvpnip))) + c = new_connection(); + c->name = xstrdup(outgoing->name); + + init_configuration(&c->config_tree); + read_connection_config(c); + + if(!get_config_string(lookup_config(c->config_tree, "Address"), &c->hostname)) { - syslog(LOG_ERR, "No value for my VPN IP given"); - return -1; + syslog(LOG_ERR, _("No address specified for %s"), c->name); + free_connection(c); + free(outgoing->name); + free(outgoing); + return; } - myself->vpn_ip = cfg->data.ip->ip; - myself->vpn_mask = cfg->data.ip->mask; + if(!get_config_port(lookup_config(c->config_tree, "Port"), &c->port)) + c->port = 655; - if(!(cfg = get_config_val(listenport))) - myself->port = 655; - else - myself->port = cfg->data.val; - - if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0) + if(!(h = gethostbyname(c->hostname))) { - syslog(LOG_ERR, "Unable to set up a listening socket"); - return -1; + syslog(LOG_ERR, _("Error looking up `%s': %m"), c->hostname); + free_connection(c); + retry_outgoing(outgoing); + return; } - if((myself->socket = setup_vpn_in_socket(myself->port)) < 0) + c->address = ntohl(*((ipv4_t*)(h->h_addr_list[0]))); + c->hostname = hostlookup(htonl(c->address)); + + if(setup_outgoing_socket(c) < 0) { - syslog(LOG_ERR, "Unable to set up an incoming vpn data socket"); - close(myself->meta_socket); - return -1; + syslog(LOG_ERR, _("Could not set up a meta connection to %s (%s)"), + c->name, c->hostname); + retry_outgoing(outgoing); + return; } - myself->status.active = 1; + c->outgoing = outgoing; + c->last_ping_time = time(NULL); + + connection_add(c); - syslog(LOG_NOTICE, "Ready: listening on port %d.", myself->port); + send_id(c); cp - return 0; } -RETSIGTYPE -sigalrm_handler(int a) +int read_rsa_public_key(connection_t *c) { - config_t const *cfg; + FILE *fp; + char *fname; + char *key; cp - cfg = get_config_val(upstreamip); + if(!c->rsa_key) + c->rsa_key = RSA_new(); + + /* First, check for simple PublicKey statement */ + + if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) + { + BN_hex2bn(&c->rsa_key->n, key); + BN_hex2bn(&c->rsa_key->e, "FFFF"); + free(key); + return 0; + } + + /* Else, check for PublicKeyFile statement and read it */ + + if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) + { + if(is_safe_path(fname)) + { + if((fp = fopen(fname, "r")) == NULL) + { + syslog(LOG_ERR, _("Error reading RSA public key file `%s': %m"), + fname); + free(fname); + return -1; + } + free(fname); + c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL); + fclose(fp); + if(!c->rsa_key) + { + syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %m"), + fname); + return -1; + } + return 0; + } + else + { + free(fname); + return -1; + } + } - if(!setup_outgoing_connection(cfg->data.ip->ip)) + /* Else, check if a harnessed public key is in the config file */ + + asprintf(&fname, "%s/hosts/%s", confbase, c->name); + if((fp = fopen(fname, "r"))) { - signal(SIGALRM, SIG_IGN); + c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL); + fclose(fp); } + + free(fname); + + if(c->rsa_key) + return 0; else { - signal(SIGALRM, sigalrm_handler); - seconds_till_retry += 5; - if(seconds_till_retry>300) /* Don't wait more than 5 minutes. */ - seconds_till_retry = 300; - alarm(seconds_till_retry); - syslog(LOG_ERR, "Still failed to connect to other. Will retry in %d seconds.", - seconds_till_retry); + syslog(LOG_ERR, _("No public key for %s specified!"), c->name); + return -1; } -cp } -/* - setup all initial network connections -*/ -int setup_network_connections(void) +int read_rsa_private_key(void) { - config_t const *cfg; + FILE *fp; + char *fname, *key; cp - if((cfg = get_config_val(pingtimeout)) == NULL) - timeout = 5; - else - timeout = cfg->data.val; - - if(setup_tap_fd() < 0) - return -1; - - if(setup_myself() < 0) - return -1; + if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) + { + myself->connection->rsa_key = RSA_new(); + BN_hex2bn(&myself->connection->rsa_key->d, key); + BN_hex2bn(&myself->connection->rsa_key->e, "FFFF"); + free(key); + return 0; + } - if((cfg = get_config_val(upstreamip)) == NULL) - /* No upstream IP given, we're listen only. */ - return 0; + if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname)) + asprintf(&fname, "%s/rsa_key.priv", confbase); - if(setup_outgoing_connection(cfg->data.ip->ip)) + if(is_safe_path(fname)) { - signal(SIGALRM, sigalrm_handler); - seconds_till_retry = 300; - alarm(seconds_till_retry); - syslog(LOG_NOTICE, "Try to re-establish outgoing connection in 5 minutes."); + if((fp = fopen(fname, "r")) == NULL) + { + syslog(LOG_ERR, _("Error reading RSA private key file `%s': %m"), + fname); + free(fname); + return -1; + } + free(fname); + myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL); + fclose(fp); + if(!myself->connection->rsa_key) + { + syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %m"), + fname); + return -1; + } + return 0; } -cp - return 0; + + free(fname); + return -1; } -/* - close all open network connections -*/ -void close_network_connections(void) +int check_rsa_key(RSA *rsa_key) { - conn_list_t *p; + char *test1, *test2, *test3; cp - for(p = conn_list; p != NULL; p = p->next) + if(rsa_key->p && rsa_key->q) { - if(p->status.dataopen) - { - shutdown(p->socket, 0); /* No more receptions */ - close(p->socket); - } - if(p->status.meta) - { - send_termreq(p); - shutdown(p->meta_socket, 0); /* No more receptions */ - close(p->meta_socket); - } + if(RSA_check_key(rsa_key) != 1) + return -1; } + else + { + test1 = xmalloc(RSA_size(rsa_key)); + test2 = xmalloc(RSA_size(rsa_key)); + test3 = xmalloc(RSA_size(rsa_key)); - if(myself) - if(myself->status.active) - { - close(myself->meta_socket); - close(myself->socket); - } + if(RSA_public_encrypt(RSA_size(rsa_key), test1, test2, rsa_key, RSA_NO_PADDING) != RSA_size(rsa_key)) + return -1; - close(tap_fd); - destroy_conn_list(); + if(RSA_private_decrypt(RSA_size(rsa_key), test2, test3, rsa_key, RSA_NO_PADDING) != RSA_size(rsa_key)) + return -1; - syslog(LOG_NOTICE, "Terminating."); + if(memcmp(test1, test3, RSA_size(rsa_key))) + return -1; + } cp - return; + return 0; } /* - create a data (udp) socket + Configure node_t myself and set up the local sockets (listen only) */ -int setup_vpn_connection(conn_list_t *cl) +int setup_myself(void) { - int nfd, flags; - struct sockaddr_in a; + config_t *cfg; + subnet_t *subnet; + char *name, *mode, *cipher, *digest; + int choice; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, "Opening UDP socket to " IP_ADDR_S, IP_ADDR_V(cl->real_ip)); + myself = new_node(); + myself->connection = new_connection(); + init_configuration(&myself->connection->config_tree); - nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); - if(nfd == -1) - { - syslog(LOG_ERR, "Creating data socket failed: %m"); - return -1; - } + asprintf(&myself->hostname, _("MYSELF")); + asprintf(&myself->connection->hostname, _("MYSELF")); - a.sin_family = AF_INET; - a.sin_port = htons(cl->port); - a.sin_addr.s_addr = htonl(cl->real_ip); + myself->connection->options = 0; + myself->connection->protocol_version = PROT_CURRENT; - if(connect(nfd, (struct sockaddr *)&a, sizeof(a)) == -1) + if(!get_config_string(lookup_config(config_tree, "Name"), &name)) /* Not acceptable */ { - syslog(LOG_ERR, "Connecting to " IP_ADDR_S ":%d failed: %m", - IP_ADDR_V(cl->real_ip), cl->port); + syslog(LOG_ERR, _("Name for tinc daemon required!")); return -1; } - flags = fcntl(nfd, F_GETFL); - if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) + if(check_id(name)) { - syslog(LOG_ERR, "This is a bug: %s:%d: %d:%m", __FILE__, __LINE__, nfd); + syslog(LOG_ERR, _("Invalid name for myself!")); + free(name); return -1; } - cl->socket = nfd; - cl->status.dataopen = 1; + myself->name = name; + myself->connection->name = xstrdup(name); + +cp + if(read_rsa_private_key()) + return -1; + + if(read_connection_config(myself->connection)) + { + syslog(LOG_ERR, _("Cannot open host configuration file for myself!")); + return -1; + } + + if(read_rsa_public_key(myself->connection)) + return -1; +cp + + if(check_rsa_key(myself->connection->rsa_key)) + { + syslog(LOG_ERR, _("Invalid public/private keypair!")); + return -1; + } + + if(!get_config_port(lookup_config(myself->connection->config_tree, "Port"), &myself->port)) + myself->port = 655; + + myself->connection->port = myself->port; + +/* Read in all the subnets specified in the host configuration file */ + + cfg = lookup_config(myself->connection->config_tree, "Subnet"); + + while(cfg) + { + if(!get_config_subnet(cfg, &subnet)) + return -1; + + subnet_add(myself, subnet); + + cfg = lookup_config_next(myself->connection->config_tree, cfg); + } + +cp + /* Check some options */ + + if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice)) + if(choice) + myself->options |= OPTION_INDIRECT; + + if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice)) + if(choice) + myself->options |= OPTION_TCPONLY; + + if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice)) + if(choice) + myself->options |= OPTION_INDIRECT; + + if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice)) + if(choice) + myself->options |= OPTION_TCPONLY; + + if(myself->options & OPTION_TCPONLY) + myself->options |= OPTION_INDIRECT; + + if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) + { + if(!strcasecmp(mode, "router")) + routing_mode = RMODE_ROUTER; + else if (!strcasecmp(mode, "switch")) + routing_mode = RMODE_SWITCH; + else if (!strcasecmp(mode, "hub")) + routing_mode = RMODE_HUB; + else + { + syslog(LOG_ERR, _("Invalid routing mode!")); + return -1; + } + } + else + routing_mode = RMODE_ROUTER; + +cp + /* Open sockets */ + + if((tcp_socket = setup_listen_socket(myself->port)) < 0) + { + syslog(LOG_ERR, _("Unable to set up a listening TCP socket!")); + return -1; + } + + if((udp_socket = setup_vpn_in_socket(myself->port)) < 0) + { + syslog(LOG_ERR, _("Unable to set up a listening UDP socket!")); + return -1; + } +cp + /* Generate packet encryption key */ + + if(get_config_string(lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) + { + if(!strcasecmp(cipher, "none")) + { + myself->cipher = NULL; + } + else + { + if(!(myself->cipher = EVP_get_cipherbyname(cipher))) + { + syslog(LOG_ERR, _("Unrecognized cipher type!")); + return -1; + } + } + } + else + myself->cipher = EVP_bf_cbc(); + + if(myself->cipher) + myself->keylength = myself->cipher->key_len + myself->cipher->iv_len; + else + myself->keylength = 1; + + myself->key = (char *)xmalloc(myself->keylength); + RAND_pseudo_bytes(myself->key, myself->keylength); + + if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime)) + keylifetime = 3600; + + keyexpires = time(NULL) + keylifetime; + + /* Check if we want to use message authentication codes... */ + + if(get_config_string(lookup_config(myself->connection->config_tree, "Digest"), &digest)) + { + if(!strcasecmp(digest, "none")) + { + myself->digest = NULL; + } + else + { + if(!(myself->digest = EVP_get_digestbyname(digest))) + { + syslog(LOG_ERR, _("Unrecognized digest type!")); + return -1; + } + } + } + else + myself->digest = EVP_sha1(); + + if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->maclength)) + { + if(myself->digest) + { + if(myself->maclength > myself->digest->md_size) + { + syslog(LOG_ERR, _("MAC length exceeds size of digest!")); + return -1; + } + else if (myself->maclength < 0) + { + syslog(LOG_ERR, _("Bogus MAC length!")); + return -1; + } + } + } + else + myself->maclength = 4; +cp + /* Done */ + + myself->nexthop = myself; + myself->via = myself; + myself->status.active = 1; + node_add(myself); + + graph(); + + syslog(LOG_NOTICE, _("Ready: listening on port %hd"), myself->port); +cp + return 0; +} + +/* + setup all initial network connections +*/ +int setup_network_connections(void) +{ +cp + init_connections(); + init_subnets(); + init_nodes(); + init_edges(); + init_events(); + + if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) + { + if(pingtimeout < 1) + { + pingtimeout = 86400; + } + } + else + pingtimeout = 60; + + if(setup_device() < 0) + return -1; + + /* Run tinc-up script to further initialize the tap interface */ + execute_script("tinc-up"); + + if(setup_myself() < 0) + return -1; + + try_outgoing_connections(); cp return 0; } +/* + close all open network connections +*/ +void close_network_connections(void) +{ + avl_node_t *node, *next; + connection_t *c; +cp + for(node = connection_tree->head; node; node = next) + { + next = node->next; + c = (connection_t *)node->data; + if(c->outgoing) + free(c->outgoing->name), free(c->outgoing); + terminate_connection(c, 0); + } + + if(myself && myself->connection) + terminate_connection(myself->connection, 0); + + close(udp_socket); + close(tcp_socket); + + exit_events(); + exit_edges(); + exit_subnets(); + exit_nodes(); + exit_connections(); + + execute_script("tinc-down"); + + close_device(); +cp + return; +} + /* handle an incoming tcp connect call and open a connection to it. */ -conn_list_t *create_new_connection(int sfd) +connection_t *create_new_connection(int sfd) { - conn_list_t *p; + connection_t *c; struct sockaddr_in ci; int len = sizeof(ci); cp - p = new_conn_list(); + c = new_connection(); - if(getpeername(sfd, &ci, &len) < 0) + if(getpeername(sfd, (struct sockaddr *) &ci, (socklen_t *) &len) < 0) { - syslog(LOG_ERR, "Error: getpeername: %m"); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "getpeername"); + close(sfd); return NULL; } - p->hostname = hostlookup(ci.sin_addr.s_addr); - p->real_ip = ntohl(ci.sin_addr.s_addr); - p->meta_socket = sfd; - p->status.meta = 1; - p->buflen = 0; - p->last_ping_time = time(NULL); - p->want_ping = 0; - - syslog(LOG_NOTICE, "Connection from %s:%d", p->hostname, htons(ci.sin_port)); + c->address = ntohl(ci.sin_addr.s_addr); + c->hostname = hostlookup(ci.sin_addr.s_addr); + c->port = htons(ci.sin_port); + c->socket = sfd; + c->last_ping_time = time(NULL); - if(send_basic_info(p) < 0) - { - free(p); - return NULL; - } + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Connection from %s port %d"), + c->hostname, c->port); + + c->allow_request = ID; cp - return p; + return c; } /* @@ -721,21 +1048,20 @@ cp */ void build_fdset(fd_set *fs) { - conn_list_t *p; + avl_node_t *node; + connection_t *c; cp FD_ZERO(fs); - for(p = conn_list; p != NULL; p = p->next) + for(node = connection_tree->head; node; node = node->next) { - if(p->status.meta) - FD_SET(p->meta_socket, fs); - if(p->status.dataopen) - FD_SET(p->socket, fs); + c = (connection_t *)node->data; + FD_SET(c->socket, fs); } - FD_SET(myself->meta_socket, fs); - FD_SET(myself->socket, fs); - FD_SET(tap_fd, fs); + FD_SET(tcp_socket, fs); + FD_SET(udp_socket, fs); + FD_SET(device_fd, fs); cp } @@ -744,98 +1070,164 @@ cp udp socket and write it to the ethertap device after being decrypted */ -int handle_incoming_vpn_data(conn_list_t *cl) +void handle_incoming_vpn_data(void) { - real_packet_t rp; - int lenin; + vpn_packet_t pkt; int x, l = sizeof(x); - conn_list_t *f; + struct sockaddr_in from; + socklen_t fromlen = sizeof(from); + node_t *n; cp - if(getsockopt(cl->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) + if(getsockopt(udp_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) { - syslog(LOG_ERR, "This is a bug: %s:%d: %d:%m", __FILE__, __LINE__, cl->socket); - return -1; + syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"), + __FILE__, __LINE__, udp_socket); + return; } if(x) { - syslog(LOG_ERR, "Incoming data socket error: %s", sys_errlist[x]); - return -1; + syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x)); + return; } - rp.len = -1; - lenin = recvfrom(cl->socket, &rp, MTU, 0, NULL, NULL); - if(lenin <= 0) + if((pkt.len = recvfrom(udp_socket, (char *)&pkt.seqno, MAXSIZE, 0, (struct sockaddr *)&from, &fromlen)) <= 0) { - syslog(LOG_ERR, "Receiving data failed: %m"); - return -1; + syslog(LOG_ERR, _("Receiving packet failed: %m")); + return; + } + + n = lookup_node_udp(ntohl(from.sin_addr.s_addr), ntohs(from.sin_port)); + + if(!n) + { + syslog(LOG_WARNING, _("Received UDP packet on port %hd from unknown source %x:%hd"), myself->port, ntohl(from.sin_addr.s_addr), ntohs(from.sin_port)); + return; } - total_socket_in += lenin; - rp.data.len = ntohs(rp.data.len); - rp.len = ntohs(rp.len); - rp.from = ntohl(rp.from); +/* + if(n->connection) + n->connection->last_ping_time = time(NULL); +*/ + receive_udppacket(n, &pkt); +cp +} + +/* Purge edges and subnets of unreachable nodes. Use carefully. */ + +void purge(void) +{ + avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext, *cnode; + node_t *n; + edge_t *e; + subnet_t *s; + connection_t *c; +cp + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_DEBUG, _("Purging unreachable nodes")); + + for(nnode = node_tree->head; nnode; nnode = nnext) + { + nnext = nnode->next; + n = (node_t *)nnode->data; - if(rp.len >= 0) + if(!n->status.reachable) { - f = lookup_conn(rp.from); - if(debug_lvl > 3) - syslog(LOG_DEBUG, "packet from " IP_ADDR_S " (len %d)", - IP_ADDR_V(rp.from), rp.len); - if(!f) + if(debug_lvl >= DEBUG_SCARY_THINGS) + syslog(LOG_DEBUG, _("Purging node %s (%s)"), n->name, n->hostname); + + for(snode = n->subnet_tree->head; snode; snode = snext) + { + snext = snode->next; + s = (subnet_t *)snode->data; + + for(cnode = connection_tree->head; cnode; cnode = cnode->next) { - syslog(LOG_ERR, "Got packet from unknown source " IP_ADDR_S, - IP_ADDR_V(rp.from)); - return -1; + c = (connection_t *)cnode->data; + if(c->status.active) + send_del_subnet(c, s); } - - if(f->status.validkey) - xrecv(f, &rp); - else + + subnet_del(n, s); + } + + for(enode = n->edge_tree->head; enode; enode = enext) + { + enext = enode->next; + e = (edge_t *)enode->data; + + for(cnode = connection_tree->head; cnode; cnode = cnode->next) { - add_queue(&(f->rq), &rp, rp.len); - if(!cl->status.waitingforkey) - send_key_request(rp.from); + c = (connection_t *)cnode->data; + if(c->status.active) + send_del_edge(c, e); } + + edge_del(e); + } - if(my_key_expiry <= time(NULL)) - regenerate_keys(); + node_del(n); } + } cp - return 0; } /* - terminate a connection and notify the other - end before closing the sockets + Terminate a connection: + - Close the socket + - Remove associated edge and tell other connections about it if report = 1 + - Check if we need to retry making an outgoing connection + - Deactivate the host */ -void terminate_connection(conn_list_t *cl) +void terminate_connection(connection_t *c, int report) { + avl_node_t *node; + connection_t *other; cp - if(cl->status.remove) + if(c->status.remove) return; + + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Closing connection with %s (%s)"), + c->name, c->hostname); + + c->status.remove = 1; + + if(c->socket) + close(c->socket); + + if(c->edge) + { + if(report) + { + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_del_edge(other, c->edge); + } + } - if(debug_lvl > 0) - syslog(LOG_NOTICE, "Closing connection with %s.", cl->hostname); + edge_del(c->edge); + } - if(cl->status.timeout) - send_timeout(cl); - else if(!cl->status.termreq) - send_termreq(cl); + /* Run MST and SSSP algorithms */ + + graph(); - close(cl->socket); - if(cl->status.meta) - close(cl->meta_socket); + /* Check if this was our outgoing connection */ - if(cl->status.outgoing) + if(c->outgoing) { - signal(SIGALRM, sigalrm_handler); - seconds_till_retry = 5; - alarm(seconds_till_retry); - syslog(LOG_NOTICE, "Try to re-establish outgoing connection in 5 seconds."); + retry_outgoing(c->outgoing); + c->outgoing = NULL; } - - cl->status.active = 0; - cl->status.remove = 1; + + /* Deactivate */ + + c->status.active = 0; + if(c->node) + c->node->connection = NULL; + do_prune = 1; cp } @@ -847,157 +1239,99 @@ cp end does not reply in time, we consider them dead and close the connection. */ -int check_dead_connections(void) +void check_dead_connections(void) { - conn_list_t *p; time_t now; + avl_node_t *node, *next; + connection_t *c; cp now = time(NULL); - for(p = conn_list; p != NULL; p = p->next) + + for(node = connection_tree->head; node; node = next) { - if(p->status.remove) - continue; - if(p->status.active && p->status.meta) - { - if(p->last_ping_time + timeout < now) + next = node->next; + c = (connection_t *)node->data; + if(c->last_ping_time + pingtimeout < now) + { + if(c->status.active) { - if(p->status.pinged && !p->status.got_pong) + if(c->status.pinged) { - syslog(LOG_INFO, "%s (" IP_ADDR_S ") didn't respond to ping", - p->hostname, IP_ADDR_V(p->vpn_ip)); - p->status.timeout = 1; - terminate_connection(p); + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_INFO, _("%s (%s) didn't respond to PING"), + c->name, c->hostname); + c->status.timeout = 1; + terminate_connection(c, 1); } - else if(p->want_ping) + else { - send_ping(p); - p->last_ping_time = now; - p->status.pinged = 1; - p->status.got_pong = 0; + send_ping(c); } } - } + else + { + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_WARNING, _("Timeout from %s (%s) during authentication"), + c->name, c->hostname); + terminate_connection(c, 0); + } + } } cp - return 0; } /* accept a new tcp connect and create a new connection */ -int handle_new_meta_connection(conn_list_t *cl) +int handle_new_meta_connection() { - conn_list_t *ncn; + connection_t *new; struct sockaddr client; - int nfd, len = sizeof(client); + int fd, len = sizeof(client); cp - if((nfd = accept(cl->meta_socket, &client, &len)) < 0) + if((fd = accept(tcp_socket, &client, &len)) < 0) { - syslog(LOG_ERR, "Accepting a new connection failed: %m"); + syslog(LOG_ERR, _("Accepting a new connection failed: %m")); return -1; } - if((ncn = create_new_connection(nfd)) == NULL) + if(!(new = create_new_connection(fd))) { - shutdown(nfd, 2); - close(nfd); - syslog(LOG_NOTICE, "Closed attempted connection."); + shutdown(fd, 2); + close(fd); + syslog(LOG_NOTICE, _("Closed attempted connection")); return 0; } - ncn->status.meta = 1; - ncn->next = conn_list; - conn_list = ncn; + connection_add(new); + + send_id(new); cp return 0; } -/* - dispatch any incoming meta requests -*/ -int handle_incoming_meta_data(conn_list_t *cl) +void try_outgoing_connections(void) { - int x, l = sizeof(x); - int request, oldlen, i; - int lenin = 0; + static config_t *cfg = NULL; + char *name; + outgoing_t *outgoing; cp - if(getsockopt(cl->meta_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) - { - syslog(LOG_ERR, "This is a bug: %s:%d: %d:%m", __FILE__, __LINE__, cl->meta_socket); - return -1; - } - if(x) - { - syslog(LOG_ERR, "Metadata socket error: %s", sys_errlist[x]); - return -1; - } - - if(cl->buflen >= MAXBUFSIZE) - { - syslog(LOG_ERR, "Metadata read buffer full! Discarding contents."); - cl->buflen = 0; - } - - lenin = read(cl->meta_socket, cl->buffer, MAXBUFSIZE-cl->buflen); - - if(lenin<=0) - { - syslog(LOG_ERR, "Metadata socket read error: %m"); - return -1; - } - - oldlen = cl->buflen; - cl->buflen += lenin; - - for(;;) + for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) { - cl->reqlen = 0; + get_config_string(cfg, &name); - for(i = oldlen; i < cl->buflen; i++) + if(check_id(name)) { - if(cl->buffer[i] == '\n') - { - cl->buffer[i] = 0; /* replace end-of-line by end-of-string so we can use sscanf */ - cl->reqlen = i + 1; - break; - } + syslog(LOG_ERR, _("Invalid name for outgoing connection in %s line %d"), cfg->file, cfg->line); + free(name); + continue; } - if(cl->reqlen) - { - if(sscanf(cl->buffer, "%d", &request) == 1) - { - if(request_handlers[request] == NULL) - { - syslog(LOG_ERR, "Unknown request: %s", cl->buffer); - return 0; - } - - if(debug_lvl > 3) - syslog(LOG_DEBUG, "Got request: %s", cl->buffer); - - request_handlers[request](cl); - } - else - { - syslog(LOG_ERR, "Bogus data received: %s", cl->buffer); - } - - cl->buflen -= cl->reqlen; - memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen); - oldlen = 0; - } - else - { - break; - } + outgoing = xmalloc_and_zero(sizeof(*outgoing)); + outgoing->name = name; + setup_outgoing_connection(outgoing); } - - cl->last_ping_time = time(NULL); - cl->want_ping = 0; -cp - return 0; } /* @@ -1006,96 +1340,48 @@ cp */ void check_network_activity(fd_set *f) { - conn_list_t *p; - int x, l = sizeof(x); + connection_t *c; + avl_node_t *node; cp - for(p = conn_list; p != NULL; p = p->next) + if(FD_ISSET(udp_socket, f)) + handle_incoming_vpn_data(); + + for(node = connection_tree->head; node; node = node->next) { - if(p->status.remove) - continue; + c = (connection_t *)node->data; + + if(c->status.remove) + return; - if(p->status.dataopen) - if(FD_ISSET(p->socket, f)) + if(FD_ISSET(c->socket, f)) + if(receive_meta(c) < 0) { - /* - The only thing that can happen to get us here is apparently an - error on this outgoing(!) UDP socket that isn't immediate (i.e. - something that will not trigger an error directly on send()). - I've once got here when it said `No route to host'. - */ - getsockopt(p->socket, SOL_SOCKET, SO_ERROR, &x, &l); - syslog(LOG_ERR, "Outgoing data socket error: %s", sys_errlist[x]); - terminate_connection(p); + terminate_connection(c, c->status.active); return; - } - - if(p->status.meta) - if(FD_ISSET(p->meta_socket, f)) - if(handle_incoming_meta_data(p) < 0) - { - terminate_connection(p); - return; - } + } } - - if(FD_ISSET(myself->socket, f)) - handle_incoming_vpn_data(myself); - if(FD_ISSET(myself->meta_socket, f)) - handle_new_meta_connection(myself); + if(FD_ISSET(tcp_socket, f)) + handle_new_meta_connection(); cp } -/* - read, encrypt and send data that is - available through the ethertap device -*/ -void handle_tap_input(void) +void prune_connections(void) { - vpn_packet_t vp; - ip_t from, to; - int ether_type, lenin; -cp - memset(&vp, 0, sizeof(vp)); - if((lenin = read(tap_fd, &vp, MTU)) <= 0) + connection_t *c; + avl_node_t *node, *next; +cp + for(node = connection_tree->head; node; node = next) { - syslog(LOG_ERR, "Error while reading from tapdevice: %m"); - return; - } - - total_tap_in += lenin; + next = node->next; + c = (connection_t *)node->data; - ether_type = ntohs(*((unsigned short*)(&vp.data[12]))); - if(ether_type != 0x0800) - { - if(debug_lvl > 0) - syslog(LOG_INFO, "Non-IP ethernet frame %04x from " MAC_ADDR_S, - ether_type, MAC_ADDR_V(vp.data[6])); - return; + if(c->status.remove) + connection_del(c); } - if(lenin < 32) - { - if(debug_lvl > 0) - syslog(LOG_INFO, "Dropping short packet"); - return; - } - - from = ntohl(*((unsigned long*)(&vp.data[26]))); - to = ntohl(*((unsigned long*)(&vp.data[30]))); - - if(debug_lvl > 3) - syslog(LOG_DEBUG, "An IP packet (%04x) for " IP_ADDR_S " from " IP_ADDR_S, - ether_type, IP_ADDR_V(to), IP_ADDR_V(from)); - if(debug_lvl > 4) - syslog(LOG_DEBUG, MAC_ADDR_S " to " MAC_ADDR_S, - MAC_ADDR_V(vp.data[0]), MAC_ADDR_V(vp.data[6])); - - vp.len = (length_t)lenin - 2; - - strip_mac_addresses(&vp); - - send_packet(to, &vp); + if(!connection_tree->head) + purge(); cp } @@ -1108,38 +1394,115 @@ void main_loop(void) struct timeval tv; int r; time_t last_ping_check; + int t; + event_t *event; + vpn_packet_t packet; cp last_ping_check = time(NULL); + srand(time(NULL)); + for(;;) { - tv.tv_sec = timeout; + tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */ tv.tv_usec = 0; - prune_conn_list(); + if(do_prune) + { + prune_connections(); + do_prune = 0; + } + build_fdset(&fset); if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0) { - if(errno == EINTR) /* because of alarm */ - continue; - syslog(LOG_ERR, "Error while waiting for input: %m"); - return; + if(errno != EINTR) /* because of a signal */ + { + syslog(LOG_ERR, _("Error while waiting for input: %m")); + return; + } + } + + if(sighup) + { + syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds")); + sighup = 0; + close_network_connections(); + exit_configuration(&config_tree); + + if(read_server_config()) + { + syslog(LOG_ERR, _("Unable to reread configuration file, exiting")); + exit(1); + } + + sleep(5); + + if(setup_network_connections()) + return; + + continue; } - if(last_ping_check + timeout < time(NULL)) - /* Let's check if everybody is still alive */ + if(do_purge) + { + purge(); + do_purge = 0; + } + + t = time(NULL); + + /* Let's check if everybody is still alive */ + + if(last_ping_check + pingtimeout < t) { check_dead_connections(); last_ping_check = time(NULL); - continue; + + /* Should we regenerate our key? */ + + if(keyexpires < t) + { + if(debug_lvl >= DEBUG_STATUS) + syslog(LOG_INFO, _("Regenerating symmetric key")); + + RAND_pseudo_bytes(myself->key, myself->keylength); + send_key_changed(myself->connection, myself); + keyexpires = time(NULL) + keylifetime; + } + } + + if(sigalrm) + { + syslog(LOG_INFO, _("Flushing event queue")); + + while(event_tree->head) + { + event = (event_t *)event_tree->head->data; + event->handler(event->data); + event_del(event); + } + sigalrm = 0; + } + + while((event = get_expired_event())) + { + event->handler(event->data); + free(event); } - check_network_activity(&fset); + if(r > 0) + { + check_network_activity(&fset); - /* local tap data */ - if(FD_ISSET(tap_fd, &fset)) - handle_tap_input(); + /* local tap data */ + if(FD_ISSET(device_fd, &fset)) + { + if(!read_packet(&packet)) + route_outgoing(&packet); + } + } } cp }