X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fnet.c;h=33d90da8137d861864f0e61a923562ce3acdfdbf;hb=f02d3ed3e135b5326003e7f69f8331ff6a3cc219;hp=50f4acb4f44cc46fe78003541d7b6da798becec1;hpb=b98d9787fdde54f33dcdb376e1e018cd418aff8d;p=tinc diff --git a/src/net.c b/src/net.c index 50f4acb4..33d90da8 100644 --- a/src/net.c +++ b/src/net.c @@ -1,7 +1,7 @@ /* net.c -- most of the network code - Copyright (C) 1998-2001 Ivo Timmermans , - 2000,2001 Guus Sliepen + Copyright (C) 1998-2005 Ivo Timmermans, + 2000-2006 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 @@ -17,1191 +17,419 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: net.c,v 1.35.4.139 2001/10/27 15:19:13 guus Exp $ + $Id$ */ -#include "config.h" - -#include -#include -#include -#include -#ifdef HAVE_LINUX - #include - #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 - -#ifndef HAVE_RAND_PSEUDO_BYTES -#define RAND_pseudo_bytes RAND_bytes -#endif - -#include -#include -#include -#include +#include "utils.h" +#include "avl_tree.h" #include "conf.h" #include "connection.h" +#include "device.h" +#include "graph.h" +#include "logger.h" #include "meta.h" #include "net.h" #include "netutl.h" #include "process.h" #include "protocol.h" #include "subnet.h" -#include "process.h" -#include "route.h" -#include "device.h" - -#include "system.h" +#include "xalloc.h" + +/* Purge edges and subnets of unreachable nodes. Use carefully. */ + +static void purge(void) { + avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext; + node_t *n; + edge_t *e; + subnet_t *s; + + cp(); + + ifdebug(PROTOCOL) logger(LOG_DEBUG, _("Purging unreachable nodes")); + + /* Remove all edges and subnets owned by unreachable nodes. */ + + for(nnode = node_tree->head; nnode; nnode = nnext) { + nnext = nnode->next; + n = nnode->data; + + if(!n->status.reachable) { + ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Purging node %s (%s)"), n->name, + n->hostname); + + for(snode = n->subnet_tree->head; snode; snode = snext) { + snext = snode->next; + s = snode->data; + if(!tunnelserver) + send_del_subnet(broadcast, s); + subnet_del(n, s); + } + + for(enode = n->edge_tree->head; enode; enode = enext) { + enext = enode->next; + e = enode->data; + if(!tunnelserver) + send_del_edge(broadcast, e); + edge_del(e); + } + } + } -int maxtimeout = 900; -int seconds_till_retry = 5; + /* Check if anyone else claims to have an edge to an unreachable node. If not, delete node. */ -int tcp_socket = -1; -int udp_socket = -1; + for(nnode = node_tree->head; nnode; nnode = nnext) { + nnext = nnode->next; + n = nnode->data; -int keylifetime = 0; -int keyexpires = 0; + if(!n->status.reachable) { + for(enode = edge_weight_tree->head; enode; enode = enext) { + enext = enode->next; + e = enode->data; -/* VPN packet I/O */ + if(e->to == n) + break; + } -void receive_udppacket(node_t *n, vpn_packet_t *inpkt) -{ - vpn_packet_t outpkt; - int outlen, outpad; - EVP_CIPHER_CTX ctx; -cp - /* Decrypt the packet */ + if(!enode) + node_del(n); + } + } +} - EVP_DecryptInit(&ctx, myself->cipher, myself->key, myself->key + myself->cipher->key_len); - EVP_DecryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len); - EVP_DecryptFinal(&ctx, outpkt.salt + outlen, &outpad); - outlen += outpad; - outpkt.len = outlen - sizeof(outpkt.salt); +/* + put all file descriptors into events + While we're at it, purge stuf that needs to be removed. +*/ +static int build_fdset(void) { + avl_node_t *node, *next; + connection_t *c; + int i, max = 0; + + cp(); + + for(node = connection_tree->head; node; node = next) { + next = node->next; + c = node->data; + + if(c->status.remove) { + connection_del(c); + if(!connection_tree->head) + purge(); + } + } - receive_packet(n, &outpkt); -cp + return 0; } -void receive_tcppacket(connection_t *c, char *buffer, int len) -{ - vpn_packet_t outpkt; -cp - outpkt.len = len; - memcpy(outpkt.data, buffer, len); +/* + Terminate a connection: + - Close the socket + - Remove associated edge and tell other connections about it if report = true + - Check if we need to retry making an outgoing connection + - Deactivate the host +*/ +void terminate_connection(connection_t *c, bool report) { + cp(); - receive_packet(c->node, &outpkt); -cp -} + if(c->status.remove) + return; -void receive_packet(node_t *n, vpn_packet_t *packet) -{ -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), packet->len, n->name, n->hostname); + ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Closing connection with %s (%s)"), + c->name, c->hostname); - route_incoming(n, packet); -cp -} + c->status.remove = true; + c->status.active = false; -void send_udppacket(node_t *n, vpn_packet_t *inpkt) -{ - 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 - 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); - - /* 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(!n->status.waitingforkey) - send_req_key(n->nexthop->connection, myself, n); - return; - } - - /* Encrypt the packet. */ - - RAND_pseudo_bytes(inpkt->salt, sizeof(inpkt->salt)); - - EVP_EncryptInit(&ctx, n->cipher, n->key, n->key + n->cipher->key_len); - EVP_EncryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len + sizeof(inpkt->salt)); - EVP_EncryptFinal(&ctx, outpkt.salt + outlen, &outpad); - outlen += outpad; - - 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.salt, outlen, 0, (const struct sockaddr *)&to, tolen)) < 0) - { - syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"), - n->name, n->hostname); - return; - } -cp -} + if(c->node) + c->node->connection = NULL; -/* - send a packet to the given vpn ip. -*/ -void send_packet(node_t *n, vpn_packet_t *packet) -{ -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.active) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("%s (%s) is not active, dropping packet"), - n->name, n->hostname); - - return; - } -/* FIXME - if(n->via == myself) - via = n->nexthop; - else - via = n->via; - - if(via != n && debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_ERR, _("Sending packet to %s via %s (%s)"), - n->name, via->name, 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); -*/ -} + if(c->socket) + closesocket(c->socket); -/* Broadcast a packet to all active direct connections */ - -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) - { - c = (connection_t *)node->data; - if(c->status.active && c != from->nexthop->connection) - send_packet(c->node, packet); - } -cp -} + event_del(&c->ev); -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 -} + if(c->edge) { + if(report && !tunnelserver) + send_del_edge(broadcast, c->edge); -/* Setup sockets */ - -int setup_listen_socket(int port) -{ - int nfd, flags; - struct sockaddr_in a; - int option; - char *interface; - char *address; - ip_mask_t *ipmask; -cp - if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) - { - syslog(LOG_ERR, _("Creating metasocket failed: %m")); - return -1; - } - - flags = fcntl(nfd, F_GETFL); - if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) - { - 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_addr.s_addr = htonl(INADDR_ANY); - a.sin_port = htons(port); - - if(get_config_string(lookup_config(config_tree, "BindToAddress"), &address)) - { - ipmask = strtoip(address); - if(ipmask) - { - a.sin_addr.s_addr = htonl(ipmask->address); - free(ipmask); - } - } - - if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr))) - { - close(nfd); - syslog(LOG_ERR, _("Can't bind to port %hd/tcp: %m"), port); - return -1; - } - - if(listen(nfd, 3)) - { - close(nfd); - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "listen"); - return -1; - } -cp - return nfd; -} + edge_del(c->edge); -int setup_vpn_in_socket(int port) -{ - int nfd, flags; - struct sockaddr_in a; - const int one = 1; -cp - if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) - { - close(nfd); - syslog(LOG_ERR, _("Creating socket failed: %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) - { - close(nfd); - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "fcntl"); - return -1; - } - - memset(&a, 0, sizeof(a)); - a.sin_family = AF_INET; - a.sin_port = htons(port); - a.sin_addr.s_addr = htonl(INADDR_ANY); - - if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr))) - { - close(nfd); - syslog(LOG_ERR, _("Can't bind to port %hd/udp: %m"), port); - return -1; - } -cp - return nfd; -} + /* Run MST and SSSP algorithms */ -int setup_outgoing_socket(connection_t *c) -{ - int flags; - struct sockaddr_in a; - int option; -cp - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname); - - c->socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); - - if(c->socket == -1) - { - 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(0); - a.sin_addr.s_addr = htonl(INADDR_ANY); - - if(bind(c->socket, (struct sockaddr *)&a, sizeof(struct sockaddr))) - { - close(c->socket); - syslog(LOG_ERR, _("System call `%s' failed: %m"), "bind"); - return -1; - } - - */ - - /* 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) - { - close(c->socket); - syslog(LOG_ERR, _("%s port %hd: %m"), c->hostname, c->port); - return -1; - } - - flags = fcntl(c->socket, F_GETFL); - - if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) - { - close(c->socket); - syslog(LOG_ERR, _("fcntl for %s port %d: %m"), - c->hostname, c->port); - return -1; - } - - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_INFO, _("Connected to %s port %hd"), - c->hostname, c->port); -cp - return 0; -} + graph(); -int setup_outgoing_connection(char *name) -{ - connection_t *c; - struct hostent *h; -cp - c = new_connection(); - c->name = xstrdup(name); - - read_connection_config(c); - - if(!get_config_string(lookup_config(c->config_tree, "Address"), &c->hostname)) - { - syslog(LOG_ERR, _("No address specified for %s"), c->name); - free_connection(c); - return -1; - } - - if(!get_config_port(lookup_config(c->config_tree, "Port"), &c->port)) - { - syslog(LOG_ERR, _("No port specified for %s"), c->name); - free_connection(c); - return -1; - } - - if(!(h = gethostbyname(c->hostname))) - { - syslog(LOG_ERR, _("Error looking up `%s': %m"), c->hostname); - free_connection(c); - return -1; - } - - 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, _("Could not set up a meta connection to %s (%s)"), - c->name, c->hostname); - free_connection(c); - return -1; - } - - c->status.outgoing = 1; - c->last_ping_time = time(NULL); - - connection_add(c); - - send_id(c); -cp - return 0; -} + /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */ -int read_rsa_public_key(connection_t *c) -{ - FILE *fp; - char *fname; - char *key; - void *result; -cp - 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"); - 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); - return -1; - } - result = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL); - fclose(fp); - if(!result) - { - syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %m"), - fname); - return -1; - } - return 0; - } - else - return -1; - } - - /* Else, check if a harnessed public key is in the config file */ - - result = NULL; - - asprintf(&fname, "%s/hosts/%s", confbase, c->name); - if((fp = fopen(fname, "r"))) - { - result = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL); - fclose(fp); - free(fname); - } - - free(fname); - - if(result) - return 0; - else - { - syslog(LOG_ERR, _("No public key for %s specified!"), c->name); - return -1; - } -} + if(report && !c->node->status.reachable) { + edge_t *e; + e = lookup_edge(c->node, myself); + if(e) { + if(!tunnelserver) + send_del_edge(broadcast, e); + edge_del(e); + } + } + } -int read_rsa_private_key(void) -{ - FILE *fp; - void *result; - char *fname, *key; -cp - if(!myself->connection->rsa_key) - myself->connection->rsa_key = RSA_new(); - - if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) - { - BN_hex2bn(&myself->connection->rsa_key->d, key); - BN_hex2bn(&myself->connection->rsa_key->e, "FFFF"); - } - else if(get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname)) - { - if((fp = fopen(fname, "r")) == NULL) - { - syslog(LOG_ERR, _("Error reading RSA private key file `%s': %m"), - fname); - return -1; - } - result = PEM_read_RSAPrivateKey(fp, &myself->connection->rsa_key, NULL, NULL); - fclose(fp); - if(!result) - { - syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %m"), - fname); - return -1; - } - } - else - { - syslog(LOG_ERR, _("No private key for tinc daemon specified!")); - return -1; - } -cp - return 0; -} + /* Check if this was our outgoing connection */ -/* - Configure node_t myself and set up the local sockets (listen only) -*/ -int setup_myself(void) -{ - config_t *cfg; - subnet_t *subnet; - char *name, *mode; - int choice; -cp - myself = new_node(); - myself->connection = new_connection(); - - asprintf(&myself->hostname, _("MYSELF")); - asprintf(&myself->connection->hostname, _("MYSELF")); - - myself->connection->options = 0; - myself->connection->protocol_version = PROT_CURRENT; - - if(!get_config_string(lookup_config(config_tree, "Name"), &name)) /* Not acceptable */ - { - syslog(LOG_ERR, _("Name for tinc daemon required!")); - return -1; - } - - if(check_id(name)) - { - syslog(LOG_ERR, _("Invalid name for myself!")); - free(name); - return -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(c->outgoing) { + retry_outgoing(c->outgoing); + c->outgoing = NULL; + } -/* - if(RSA_check_key(rsa_key) != 1) - { - 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 */ - - myself->cipher = EVP_bf_cbc(); - - myself->keylength = myself->cipher->key_len + myself->cipher->iv_len; - - 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; -cp - /* Done */ - - myself->nexthop = myself; - myself->via = myself; - myself->status.active = 1; - node_add(myself); - - syslog(LOG_NOTICE, _("Ready: listening on port %hd"), myself->port); -cp - return 0; + free(c->outbuf); + c->outbuf = NULL; + c->outbuflen = 0; + c->outbufsize = 0; + c->outbufstart = 0; } /* - setup all initial network connections + Check if the other end is active. + If we have sent packets, but didn't receive any, + then possibly the other end is dead. We send a + PING request over the meta connection. If the other + end does not reply in time, we consider them dead + and close the connection. */ -int setup_network_connections(void) -{ -cp - init_connections(); - init_subnets(); - init_nodes(); - - if(get_config_int(lookup_config(config_tree, "PingTimeout"), &timeout)) - { - if(timeout < 1) - { - timeout = 86400; - } - } - else - timeout = 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; - - signal(SIGALRM, try_outgoing_connections); - alarm(5); -cp - return 0; -} +static void timeout_handler(int fd, short events, void *event) { + avl_node_t *node, *next; + connection_t *c; + time_t now = time(NULL); + + cp(); + + for(node = connection_tree->head; node; node = next) { + next = node->next; + c = node->data; + + if(c->last_ping_time + pingtimeout < now) { + if(c->status.active) { + if(c->status.pinged) { + ifdebug(CONNECTIONS) logger(LOG_INFO, _("%s (%s) didn't respond to PING in %ld seconds"), + c->name, c->hostname, now - c->last_ping_time); + c->status.timeout = true; + terminate_connection(c, true); + } else if(c->last_ping_time + pinginterval < now) { + send_ping(c); + } + } else { + if(c->status.remove) { + logger(LOG_WARNING, _("Old connection_t for %s (%s) status %04x still lingering, deleting..."), + c->name, c->hostname, c->status.value); + connection_del(c); + continue; + } + ifdebug(CONNECTIONS) logger(LOG_WARNING, _("Timeout from %s (%s) during authentication"), + c->name, c->hostname); + if(c->status.connecting) { + c->status.connecting = false; + closesocket(c->socket); + do_outgoing_connection(c); + } else { + terminate_connection(c, false); + } + } + } + } -/* - 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; - c->status.outgoing = 0; - terminate_connection(c, 0); - } - -// terminate_connection(myself, 0); - -// destroy_trees(); - - execute_script("tinc-down"); - - close_device(); -cp - return; + event_add(event, &(struct timeval){pingtimeout, 0}); } -/* - handle an incoming tcp connect call and open - a connection to it. -*/ -connection_t *create_new_connection(int sfd) -{ - connection_t *c; - struct sockaddr_in ci; - int len = sizeof(ci); -cp - c = new_connection(); - - if(getpeername(sfd, (struct sockaddr *) &ci, (socklen_t *) &len) < 0) - { - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "getpeername"); - close(sfd); - return NULL; - } - - c->address = ntohl(ci.sin_addr.s_addr); - c->hostname = hostlookup(ci.sin_addr.s_addr); - c->port = htons(ci.sin_port); /* This one will be overwritten later */ - c->socket = sfd; - c->last_ping_time = time(NULL); - - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_NOTICE, _("Connection from %s port %d"), - c->hostname, htons(ci.sin_port)); - - c->allow_request = ID; -cp - return c; -} +void handle_meta_connection_data(int fd, short events, void *data) { + connection_t *c = data; + int result; + socklen_t len = sizeof(result); + + if (c->status.remove) + return; + + if(c->status.connecting) { + getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len); + + if(!result) + finish_connecting(c); + else { + ifdebug(CONNECTIONS) logger(LOG_DEBUG, + _("Error while connecting to %s (%s): %s"), + c->name, c->hostname, strerror(result)); + c->status.connecting = false; + closesocket(c->socket); + do_outgoing_connection(c); + return; + } + } -/* - put all file descriptors in an fd_set array -*/ -void build_fdset(fd_set *fs) -{ - avl_node_t *node; - connection_t *c; -cp - FD_ZERO(fs); - - for(node = connection_tree->head; node; node = node->next) - { - c = (connection_t *)node->data; - FD_SET(c->socket, fs); - } - - FD_SET(tcp_socket, fs); - FD_SET(udp_socket, fs); - FD_SET(device_fd, fs); -cp + if (!receive_meta(c)) { + terminate_connection(c, c->status.active); + return; + } } -/* - receive incoming data from the listening - udp socket and write it to the ethertap - device after being decrypted -*/ -void handle_incoming_vpn_data(void) -{ - vpn_packet_t pkt; - int x, l = sizeof(x); - struct sockaddr_in from; - socklen_t fromlen = sizeof(from); - node_t *n; -cp - if(getsockopt(udp_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) - { - 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"), strerror(x)); - return; - } - - if((pkt.len = recvfrom(udp_socket, (char *) pkt.salt, MTU, 0, (struct sockaddr *)&from, &fromlen)) <= 0) - { - 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 packets on port %hd from unknown source %x:%hd"), myself->port, ntohl(from.sin_addr.s_addr), ntohs(from.sin_port)); - return; - } -/* - if(n->connection) - n->connection->last_ping_time = time(NULL); -*/ - receive_udppacket(n, &pkt); -cp +static void sigterm_handler(int signal, short events, void *data) { + logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal)); + event_loopexit(NULL); } -/* - Terminate a connection: - - Close the sockets - - Remove associated hosts and subnets - - Deactivate the host - - Since it might still be referenced, put it on the prune list. - - If report == 1, then send DEL_HOST messages to the other tinc daemons. -*/ -void terminate_connection(connection_t *c, int report) -{ - /* Needs a serious rewrite. */ +static void sigint_handler(int signal, short events, void *data) { + static int saved_debug_level = -1; + + logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal)); + + if(saved_debug_level != -1) { + logger(LOG_NOTICE, _("Reverting to old debug level (%d)"), + saved_debug_level); + debug_level = saved_debug_level; + saved_debug_level = -1; + } else { + logger(LOG_NOTICE, + _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."), + debug_level); + saved_debug_level = debug_level; + debug_level = 5; + } } -/* - Check if the other end is active. - If we have sent packets, but didn't receive any, - then possibly the other end is dead. We send a - PING request over the meta connection. If the other - end does not reply in time, we consider them dead - and close the connection. -*/ -void check_dead_connections(void) -{ - time_t now; - avl_node_t *node, *next; - connection_t *c; -cp - now = time(NULL); - - for(node = connection_tree->head; node; node = next) - { - next = node->next; - c = (connection_t *)node->data; - if(c->last_ping_time + timeout < now) - { - if(c->status.active) - { - if(c->status.pinged) - { - 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 - { - 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 +static void sigusr1_handler(int signal, short events, void *data) { + logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal)); + dump_connections(); } -/* - accept a new tcp connect and create a - new connection -*/ -int handle_new_meta_connection() -{ - connection_t *new; - struct sockaddr client; - int fd, len = sizeof(client); -cp - if((fd = accept(tcp_socket, &client, &len)) < 0) - { - syslog(LOG_ERR, _("Accepting a new connection failed: %m")); - return -1; - } - - if(!(new = create_new_connection(fd))) - { - shutdown(fd, 2); - close(fd); - syslog(LOG_NOTICE, _("Closed attempted connection")); - return 0; - } - - connection_add(new); - - send_id(new); -cp - return 0; +static void sigusr2_handler(int signal, short events, void *data) { + logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal)); + dump_device_stats(); + dump_nodes(); + dump_edges(); + dump_subnets(); } -void randomized_alarm(int seconds) -{ - unsigned char r; - RAND_pseudo_bytes(&r, 1); - alarm((seconds * (int)r) / 128 + 1); +static void sigwinch_handler(int signal, short events, void *data) { + logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal)); + purge(); } -/* This function is severely fucked up. - We want to redesign it so the following rules apply: - - - Try all ConnectTo's in a row: - - if a connect() fails, try next one immediately, - - if it works, wait 5 seconds or so. - - If none of them were succesful, increase delay and retry. - - If all were succesful, don't try anymore. -*/ +static void sighup_handler(int signal, short events, void *data) { + connection_t *c; + avl_node_t *node; + char *fname; + struct stat s; + static time_t last_config_check = 0; + + logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal)); -RETSIGTYPE -try_outgoing_connections(int a) -{ - static config_t *cfg = NULL; - static int retry = 0; - char *name; -cp - if(!cfg) - cfg = lookup_config(config_tree, "ConnectTo"); - - if(!cfg) - return; - - while(cfg) - { - get_config_string(cfg, &name); - cfg = lookup_config_next(config_tree, cfg); /* Next time skip to next ConnectTo line */ - - if(!setup_outgoing_connection(name)) /* function returns 0 when there are no problems */ - retry = 1; - - } - - get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout); - - if(retry) - { - seconds_till_retry += 5; - if(seconds_till_retry > maxtimeout) /* Don't wait more than MAXTIMEOUT seconds. */ - seconds_till_retry = maxtimeout; - - syslog(LOG_ERR, _("Failed to setup all outgoing connections, will retry in %d seconds"), - seconds_till_retry); - - /* Randomize timeout to avoid global synchronisation effects */ - randomized_alarm(seconds_till_retry); - } - else - { - seconds_till_retry = 5; - } -cp + /* Reread our own configuration file */ + + exit_configuration(&config_tree); + init_configuration(&config_tree); + + if(!read_server_config()) { + logger(LOG_ERR, _("Unable to reread configuration file, exitting.")); + event_loopexit(NULL); + return; + } + + /* Close connections to hosts that have a changed or deleted host config file */ + + for(node = connection_tree->head; node; node = node->next) { + c = node->data; + + if(c->outgoing) { + free(c->outgoing->name); + if(c->outgoing->ai) + freeaddrinfo(c->outgoing->ai); + free(c->outgoing); + c->outgoing = NULL; + } + + asprintf(&fname, "%s/hosts/%s", confbase, c->name); + if(stat(fname, &s) || s.st_mtime > last_config_check) + terminate_connection(c, c->status.active); + free(fname); + } + + last_config_check = time(NULL); + + /* Try to make outgoing connections */ + + try_outgoing_connections(); } -/* - check all connections to see if anything - happened on their sockets -*/ -void check_network_activity(fd_set *f) -{ - connection_t *c; - avl_node_t *node; -cp - if(FD_ISSET(udp_socket, f)) - handle_incoming_vpn_data(); - - for(node = connection_tree->head; node; node = node->next) - { - c = (connection_t *)node->data; - - if(c->status.remove) - return; - - if(FD_ISSET(c->socket, f)) - if(receive_meta(c) < 0) - { - terminate_connection(c, c->status.active); - return; - } - } - - if(FD_ISSET(tcp_socket, f)) - handle_new_meta_connection(); -cp +static void sigalrm_handler(int signal, short events, void *data) { + logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal)); + + connection_t *c; + avl_node_t *node; + + for(node = connection_tree->head; node; node = node->next) { + c = node->data; + + if(c->outgoing && !c->node) { + if(timeout_initialized(&c->outgoing->ev)) + event_del(&c->outgoing->ev); + if(c->status.connecting) + close(c->socket); + c->outgoing->timeout = 0; + do_outgoing_connection(c); + } + } } /* this is where it all happens... */ -void main_loop(void) -{ - fd_set fset; - struct timeval tv; - int r; - time_t last_ping_check; - int t; - vpn_packet_t packet; -cp - last_ping_check = time(NULL); - - for(;;) - { - tv.tv_sec = timeout; - tv.tv_usec = 0; - - build_fdset(&fset); - - if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0) - { - if(errno != EINTR) /* because of alarm */ - { - 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; - } - - t = time(NULL); - - /* Let's check if everybody is still alive */ - - if(last_ping_check + timeout < t) - { - check_dead_connections(); - last_ping_check = time(NULL); - - /* 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; - } +int main_loop(void) { + struct timeval tv; + int r; + struct event timeout_event; + struct event sighup_event; + struct event sigint_event; + struct event sigterm_event; + struct event sigquit_event; + struct event sigusr1_event; + struct event sigusr2_event; + struct event sigwinch_event; + struct event sigalrm_event; + + cp(); + + timeout_set(&timeout_event, timeout_handler, &timeout_event); + event_add(&timeout_event, &(struct timeval){pingtimeout, 0}); + signal_set(&sighup_event, SIGHUP, sighup_handler, NULL); + signal_add(&sighup_event, NULL); + signal_set(&sigint_event, SIGINT, sigint_handler, NULL); + signal_add(&sigint_event, NULL); + signal_set(&sigterm_event, SIGTERM, sigterm_handler, NULL); + signal_add(&sigterm_event, NULL); + signal_set(&sigquit_event, SIGQUIT, sigterm_handler, NULL); + signal_add(&sigquit_event, NULL); + signal_set(&sigusr1_event, SIGUSR1, sigusr1_handler, NULL); + signal_add(&sigusr1_event, NULL); + signal_set(&sigusr2_event, SIGUSR2, sigusr2_handler, NULL); + signal_add(&sigusr2_event, NULL); + signal_set(&sigwinch_event, SIGWINCH, sigwinch_handler, NULL); + signal_add(&sigwinch_event, NULL); + signal_set(&sigalrm_event, SIGALRM, sigalrm_handler, NULL); + signal_add(&sigalrm_event, NULL); + + if(event_loop(0) < 0) { + logger(LOG_ERR, _("Error while waiting for input: %s"), strerror(errno)); + return 1; } - if(r > 0) - { - check_network_activity(&fset); - - /* local tap data */ - if(FD_ISSET(device_fd, &fset)) - { - if(read_packet(&packet)) - route_outgoing(&packet); - else - return; - } - } - } -cp + signal_del(&sighup_event); + signal_del(&sigint_event); + signal_del(&sigterm_event); + signal_del(&sigquit_event); + signal_del(&sigusr1_event); + signal_del(&sigusr2_event); + signal_del(&sigwinch_event); + signal_del(&sigalrm_event); + event_del(&timeout_event); + + return 0; }