X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet.c;h=0a23c82168c258e943f997c1f9408cde21ceb9c5;hp=2c08dcf2460e8e175e4867f3e6a37d1098645a1e;hb=d699f3079c658e05f928c358d110d1d27849ea71;hpb=7db1b999c82611d6c68a5d79b4754db19669d5c6 diff --git a/src/net.c b/src/net.c index 2c08dcf2..0a23c821 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) 1998-2002 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 @@ -17,7 +17,7 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: net.c,v 1.35.4.110 2001/05/28 08:56:57 guus Exp $ + $Id: net.c,v 1.35.4.167 2002/03/24 16:28:27 guus Exp $ */ #include "config.h" @@ -33,7 +33,7 @@ #include #include #include -#include +#include #include #include #include @@ -45,1131 +45,179 @@ #include #include -#ifdef HAVE_OPENSSL_RAND_H -# include -#else -# include -#endif - -#ifdef HAVE_OPENSSL_EVP_H -# include -#else -# include -#endif - -#ifdef HAVE_OPENSSL_ERR_H -# include -#else -# include -#endif - -#ifdef HAVE_OPENSSL_PEM_H -# include -#else -# include -#endif - -#ifdef HAVE_TUNTAP -#include LINUX_IF_TUN_H -#endif - -#include -#include -#include -#include - -#include "conf.h" -#include "connection.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 "system.h" - -int tap_fd = -1; -int taptype = TAP_TYPE_ETHERTAP; -int total_tap_in = 0; -int total_tap_out = 0; -int total_socket_in = 0; -int total_socket_out = 0; - -config_t *upstreamcfg; -static int seconds_till_retry; - -int keylifetime = 0; -int keyexpires = 0; - -char *unknown = NULL; - -void send_udppacket(connection_t *cl, 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(!cl->status.validkey) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"), - cl->name, cl->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(cl->queue, copy); - - if(!cl->status.waitingforkey) - send_req_key(myself, cl); - return; - } - - /* Encrypt the packet. */ - - RAND_bytes(inpkt->salt, sizeof(inpkt->salt)); - - EVP_EncryptInit(&ctx, cl->cipher_pkttype, cl->cipher_pktkey, cl->cipher_pktkey + cl->cipher_pkttype->key_len); - EVP_EncryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len + sizeof(inpkt->salt)); - EVP_EncryptFinal(&ctx, outpkt.salt + outlen, &outpad); - outlen += outpad; - - total_socket_out += outlen; - - to.sin_family = AF_INET; - to.sin_addr.s_addr = htonl(cl->address); - to.sin_port = htons(cl->port); - - if((sendto(myself->socket, (char *) outpkt.salt, outlen, 0, (const struct sockaddr *)&to, tolen)) < 0) - { - syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"), - cl->name, cl->hostname); - return; - } -cp -} - -void receive_packet(connection_t *cl, vpn_packet_t *packet) -{ -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), packet->len, cl->name, cl->hostname); - - route_incoming(cl, packet); -cp -} - -void receive_udppacket(connection_t *cl, vpn_packet_t *inpkt) -{ - vpn_packet_t outpkt; - int outlen, outpad; - EVP_CIPHER_CTX ctx; -cp - /* Decrypt the packet */ - - EVP_DecryptInit(&ctx, myself->cipher_pkttype, myself->cipher_pktkey, myself->cipher_pktkey + myself->cipher_pkttype->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); - - receive_packet(cl, &outpkt); -cp -} - -void receive_tcppacket(connection_t *cl, char *buffer, int len) -{ - vpn_packet_t outpkt; -cp - outpkt.len = len; - memcpy(outpkt.data, buffer, len); - - receive_packet(cl, &outpkt); -cp -} - -void accept_packet(vpn_packet_t *packet) -{ -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Writing packet of %d bytes to tap device"), - packet->len); - - if(taptype == TAP_TYPE_TUNTAP) - { - if(write(tap_fd, packet->data, packet->len) < 0) - syslog(LOG_ERR, _("Can't write to tun/tap device: %m")); - else - total_tap_out += packet->len; - } - else /* ethertap */ - { - if(write(tap_fd, packet->data - 2, packet->len + 2) < 0) - syslog(LOG_ERR, _("Can't write to ethertap device: %m")); - else - total_tap_out += packet->len; - } -cp -} - -/* - send a packet to the given vpn ip. -*/ -void send_packet(connection_t *cl, vpn_packet_t *packet) -{ -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), - packet->len, cl->name, cl->hostname); - - if(cl == myself) - { - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_NOTICE, _("Packet is looping back to us!")); - } - - return; - } - - if(!cl->status.active) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("%s (%s) is not active, dropping packet"), - cl->name, cl->hostname); - - return; - } - - /* Check if it has to go via TCP or UDP... */ -cp - if((cl->options | myself->options) & OPTION_TCPONLY) - { - if(send_tcppacket(cl, packet)) - terminate_connection(cl); - } - else - send_udppacket(cl, packet); -} - -void flush_queue(connection_t *cl) -{ - list_node_t *node, *next; -cp - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("Flushing queue for %s (%s)"), cl->name, cl->hostname); - - for(node = cl->queue->head; node; node = next) - { - next = node->next; - send_udppacket(cl, (vpn_packet_t *)node->data); - list_delete_node(cl->queue, node); - } -cp -} - -/* - open the local ethertap device -*/ -int setup_tap_fd(void) -{ - int nfd; - const char *tapfname; - config_t const *cfg; -#ifdef HAVE_LINUX -# ifdef HAVE_TUNTAP - struct ifreq ifr; -# endif -#endif - -cp - if((cfg = get_config_val(config, config_tapdevice))) - tapfname = cfg->data.ptr; - else - { -#ifdef HAVE_LINUX -# ifdef HAVE_TUNTAP - tapfname = "/dev/net/tun"; -# else - tapfname = "/dev/tap0"; -# endif -#endif -#ifdef HAVE_FREEBSD - tapfname = "/dev/tap0"; -#endif -#ifdef HAVE_SOLARIS - tapfname = "/dev/tun"; -#endif - } -cp - if((nfd = open(tapfname, O_RDWR | O_NONBLOCK)) < 0) - { - syslog(LOG_ERR, _("Could not open %s: %m"), tapfname); - return -1; - } -cp - tap_fd = nfd; - - taptype = TAP_TYPE_ETHERTAP; - - /* Set default MAC address for ethertap devices */ - - mymac.type = SUBNET_MAC; - mymac.net.mac.address.x[0] = 0xfe; - mymac.net.mac.address.x[1] = 0xfd; - mymac.net.mac.address.x[2] = 0x00; - mymac.net.mac.address.x[3] = 0x00; - mymac.net.mac.address.x[4] = 0x00; - mymac.net.mac.address.x[5] = 0x00; - -#ifdef HAVE_LINUX - #ifdef HAVE_TUNTAP - /* Ok now check if this is an old ethertap or a new tun/tap thingie */ - memset(&ifr, 0, sizeof(ifr)); -cp - ifr.ifr_flags = IFF_TAP | IFF_NO_PI; - if (netname) - strncpy(ifr.ifr_name, netname, IFNAMSIZ); -cp - if (!ioctl(tap_fd, TUNSETIFF, (void *) &ifr)) - { - syslog(LOG_INFO, _("%s is a new style tun/tap device"), tapfname); - taptype = TAP_TYPE_TUNTAP; - } - #endif -#endif -#ifdef HAVE_FREEBSD - taptype = TAP_TYPE_TUNTAP; -#endif -cp - return 0; -} - -/* - set up the socket that we listen on for incoming - (tcp) connections -*/ -int setup_listen_meta_socket(int port) -{ - int nfd, flags; - struct sockaddr_in a; - int option; - config_t const *cfg; -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((cfg = get_config_val(config, config_interface))) - { - if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, cfg->data.ptr, strlen(cfg->data.ptr))) - { - close(nfd); - syslog(LOG_ERR, _("Unable to bind listen socket to interface %s: %m"), cfg->data.ptr); - return -1; - } - } -#endif - - memset(&a, 0, sizeof(a)); - a.sin_family = AF_INET; - a.sin_port = htons(port); - - if((cfg = get_config_val(config, config_interfaceip))) - a.sin_addr.s_addr = htonl(cfg->data.ip->address); - else - 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/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; -} - -/* - setup the socket for incoming encrypted - data (the udp part) -*/ -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; -} - -/* - setup an outgoing meta (tcp) socket -*/ -int setup_outgoing_meta_socket(connection_t *cl) -{ - int flags; - struct sockaddr_in a; - config_t const *cfg; - int option; -cp - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_INFO, _("Trying to connect to %s"), cl->hostname); - - if((cfg = get_config_val(cl->config, config_port)) == NULL) - cl->port = 655; - else - cl->port = cfg->data.val; - - cl->meta_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); - if(cl->meta_socket == -1) - { - syslog(LOG_ERR, _("Creating socket for %s port %d failed: %m"), - cl->hostname, cl->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(cl->meta_socket, (struct sockaddr *)&a, sizeof(struct sockaddr))) - { - close(cl->meta_socket); - syslog(LOG_ERR, _("System call `%s' failed: %m"), "bind"); - return -1; - } - - /* Optimize TCP settings */ - - option = 1; - setsockopt(cl->meta_socket, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option)); -#ifdef HAVE_LINUX - setsockopt(cl->meta_socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); - - option = IPTOS_LOWDELAY; - setsockopt(cl->meta_socket, SOL_IP, IP_TOS, &option, sizeof(option)); -#endif - /* Connect */ - - a.sin_family = AF_INET; - a.sin_port = htons(cl->port); - a.sin_addr.s_addr = htonl(cl->address); - - if(connect(cl->meta_socket, (struct sockaddr *)&a, sizeof(a)) == -1) - { - close(cl->meta_socket); - syslog(LOG_ERR, _("%s port %hd: %m"), cl->hostname, cl->port); - return -1; - } - - flags = fcntl(cl->meta_socket, F_GETFL); - if(fcntl(cl->meta_socket, F_SETFL, flags | O_NONBLOCK) < 0) - { - close(cl->meta_socket); - syslog(LOG_ERR, _("fcntl for %s port %d: %m"), - cl->hostname, cl->port); - return -1; - } - - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_INFO, _("Connected to %s port %hd"), - cl->hostname, cl->port); - - cl->status.meta = 1; -cp - return 0; -} - -/* - Setup an outgoing meta connection. -*/ -int setup_outgoing_connection(char *name) -{ - connection_t *ncn; - struct hostent *h; - config_t const *cfg; -cp - if(check_id(name)) - { - syslog(LOG_ERR, _("Invalid name for outgoing connection")); - return -1; - } - - ncn = new_connection(); - asprintf(&ncn->name, "%s", name); - - if(read_host_config(ncn)) - { - syslog(LOG_ERR, _("Error reading host configuration file for %s"), ncn->name); - free_connection(ncn); - return -1; - } - - if(!(cfg = get_config_val(ncn->config, config_address))) - { - syslog(LOG_ERR, _("No address specified for %s"), ncn->name); - free_connection(ncn); - return -1; - } - - if(!(h = gethostbyname(cfg->data.ptr))) - { - syslog(LOG_ERR, _("Error looking up `%s': %m"), cfg->data.ptr); - free_connection(ncn); - return -1; - } - - ncn->address = ntohl(*((ipv4_t*)(h->h_addr_list[0]))); - ncn->hostname = hostlookup(htonl(ncn->address)); - - if(setup_outgoing_meta_socket(ncn) < 0) - { - syslog(LOG_ERR, _("Could not set up a meta connection to %s"), - ncn->hostname); - free_connection(ncn); - return -1; - } - - ncn->status.outgoing = 1; - ncn->buffer = xmalloc(MAXBUFSIZE); - ncn->buflen = 0; - ncn->last_ping_time = time(NULL); - - connection_add(ncn); - - send_id(ncn); -cp - return 0; -} - -int read_rsa_public_key(connection_t *cl) -{ - config_t const *cfg; - FILE *fp; - char *fname; - void *result; -cp - if(!cl->rsa_key) - cl->rsa_key = RSA_new(); - - /* First, check for simple PublicKey statement */ - - if((cfg = get_config_val(cl->config, config_publickey))) - { - BN_hex2bn(&cl->rsa_key->n, cfg->data.ptr); - BN_hex2bn(&cl->rsa_key->e, "FFFF"); - return 0; - } - - /* Else, check for PublicKeyFile statement and read it */ - - if((cfg = get_config_val(cl->config, config_publickeyfile))) - { - if(is_safe_path(cfg->data.ptr)) - { - if((fp = fopen(cfg->data.ptr, "r")) == NULL) - { - syslog(LOG_ERR, _("Error reading RSA public key file `%s': %m"), - cfg->data.ptr); - return -1; - } - result = PEM_read_RSAPublicKey(fp, &cl->rsa_key, NULL, NULL); - fclose(fp); - if(!result) - { - syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %m"), - cfg->data.ptr); - return -1; - } - return 0; - } - else - return -1; - } - - /* Else, check if a harnessed public key is in the config file */ - - asprintf(&fname, "%s/hosts/%s", confbase, cl->name); - if((fp = fopen(fname, "r"))) - { - result = PEM_read_RSAPublicKey(fp, &cl->rsa_key, NULL, NULL); - fclose(fp); - free(fname); - if(result) - return 0; - } - - free(fname); - - /* Nothing worked. */ - - syslog(LOG_ERR, _("No public key for %s specified!"), cl->name); -cp - return -1; -} - -int read_rsa_private_key(void) -{ - config_t const *cfg; - FILE *fp; - void *result; -cp - if(!myself->rsa_key) - myself->rsa_key = RSA_new(); - - if((cfg = get_config_val(config, config_privatekey))) - { - BN_hex2bn(&myself->rsa_key->d, cfg->data.ptr); - BN_hex2bn(&myself->rsa_key->e, "FFFF"); - } - else if((cfg = get_config_val(config, config_privatekeyfile))) - { - if((fp = fopen(cfg->data.ptr, "r")) == NULL) - { - syslog(LOG_ERR, _("Error reading RSA private key file `%s': %m"), - cfg->data.ptr); - return -1; - } - result = PEM_read_RSAPrivateKey(fp, &myself->rsa_key, NULL, NULL); - fclose(fp); - if(!result) - { - syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %m"), - cfg->data.ptr); - return -1; - } - } - else - { - syslog(LOG_ERR, _("No private key for tinc daemon specified!")); - return -1; - } -cp - return 0; -} - -/* - Configure connection_t myself and set up the local sockets (listen only) -*/ -int setup_myself(void) -{ - config_t const *cfg; - config_t *next; - subnet_t *net; -cp - myself = new_connection(); - - asprintf(&myself->hostname, "MYSELF"); - myself->options = 0; - myself->protocol_version = PROT_CURRENT; - - if(!(cfg = get_config_val(config, config_name))) /* Not acceptable */ - { - syslog(LOG_ERR, _("Name for tinc daemon required!")); - return -1; - } - else - asprintf(&myself->name, "%s", (char*)cfg->data.val); - - if(check_id(myself->name)) - { - syslog(LOG_ERR, _("Invalid name for myself!")); - return -1; - } -cp - if(read_rsa_private_key()) - return -1; - - if(read_host_config(myself)) - { - syslog(LOG_ERR, _("Cannot open host configuration file for myself!")); - return -1; - } - - if(read_rsa_public_key(myself)) - return -1; -cp - -/* - if(RSA_check_key(myself->rsa_key) != 1) - { - syslog(LOG_ERR, _("Invalid public/private keypair!")); - return -1; - } -*/ - if(!(cfg = get_config_val(myself->config, config_port))) - myself->port = 655; - else - myself->port = cfg->data.val; - - if((cfg = get_config_val(myself->config, config_indirectdata))) - if(cfg->data.val == stupid_true) - myself->options |= OPTION_INDIRECT; - - if((cfg = get_config_val(myself->config, config_tcponly))) - if(cfg->data.val == stupid_true) - myself->options |= OPTION_TCPONLY; - -/* Read in all the subnets specified in the host configuration file */ - - for(next = myself->config; (cfg = get_config_val(next, config_subnet)); next = cfg->next) - { - net = new_subnet(); - net->type = SUBNET_IPV4; - net->net.ipv4.address = cfg->data.ip->address; - net->net.ipv4.mask = cfg->data.ip->mask; - - /* Teach newbies what subnets are... */ - - if((net->net.ipv4.address & net->net.ipv4.mask) != net->net.ipv4.address) - { - syslog(LOG_ERR, _("Network address and subnet mask do not match!")); - return -1; - } - - subnet_add(myself, net); - } - - if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0) - { - syslog(LOG_ERR, _("Unable to set up a listening TCP socket!")); - return -1; - } +#include - if((myself->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 */ +#include +#include +#include +#include - myself->cipher_pkttype = EVP_bf_cbc(); +#include "conf.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" - myself->cipher_pktkeylength = myself->cipher_pkttype->key_len + myself->cipher_pkttype->iv_len; +#include "system.h" - myself->cipher_pktkey = (char *)xmalloc(myself->cipher_pktkeylength); - RAND_pseudo_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength); +int do_prune = 0; +int do_purge = 0; +int sighup = 0; +int sigalrm = 0; - if(!(cfg = get_config_val(config, config_keyexpire))) - keylifetime = 3600; - else - keylifetime = cfg->data.val; +time_t now = 0; - keyexpires = time(NULL) + keylifetime; +/* + put all file descriptors in an fd_set array +*/ +void build_fdset(fd_set *fs) +{ + avl_node_t *node; + connection_t *c; + int i; cp - /* Check some options */ + FD_ZERO(fs); - if((cfg = get_config_val(config, config_indirectdata))) + for(node = connection_tree->head; node; node = node->next) { - if(cfg->data.val == stupid_true) - myself->options |= OPTION_INDIRECT; + c = (connection_t *)node->data; + FD_SET(c->socket, fs); } - if((cfg = get_config_val(config, config_tcponly))) + for(i = 0; i < listen_sockets; i++) { - if(cfg->data.val == stupid_true) - myself->options |= OPTION_TCPONLY; + FD_SET(listen_socket[i].tcp, fs); + FD_SET(listen_socket[i].udp, fs); } - if(myself->options & OPTION_TCPONLY) - myself->options |= OPTION_INDIRECT; - - /* Activate ourselves */ - - myself->status.active = 1; - - syslog(LOG_NOTICE, _("Ready: listening on port %hd"), myself->port); + FD_SET(device_fd, fs); cp - return 0; } -RETSIGTYPE -sigalrm_handler(int a) +/* Purge edges and subnets of unreachable nodes. Use carefully. */ + +void purge(void) { - config_t const *cfg; + avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext, *cnode; + node_t *n; + edge_t *e; + subnet_t *s; + connection_t *c; cp - cfg = get_config_val(upstreamcfg, config_connectto); + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_DEBUG, _("Purging unreachable nodes")); - if(!cfg) + for(nnode = node_tree->head; nnode; nnode = nnext) + { + nnext = nnode->next; + n = (node_t *)nnode->data; + + if(!n->status.reachable) { - if(upstreamcfg == config) + 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) { - /* No upstream IP given, we're listen only. */ - signal(SIGALRM, SIG_IGN); - return; - } - } - else - { - /* We previously tried all the ConnectTo lines. Now wrap back to the first. */ - cfg = get_config_val(config, config_connectto); - } - - while(cfg) - { - upstreamcfg = cfg->next; - if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */ + snext = snode->next; + s = (subnet_t *)snode->data; + + for(cnode = connection_tree->head; cnode; cnode = cnode->next) { - signal(SIGALRM, SIG_IGN); - return; + c = (connection_t *)cnode->data; + if(c->status.active) + send_del_subnet(c, s); } - cfg = get_config_val(upstreamcfg, config_connectto); /* Or else we try the next ConnectTo line */ - } - signal(SIGALRM, sigalrm_handler); - upstreamcfg = config; - seconds_till_retry += 5; - if(seconds_till_retry > MAXTIMEOUT) /* Don't wait more than MAXTIMEOUT seconds. */ - seconds_till_retry = MAXTIMEOUT; - syslog(LOG_ERR, _("Still failed to connect to other, will retry in %d seconds"), - seconds_till_retry); - alarm(seconds_till_retry); -cp -} + subnet_del(n, s); + } -/* - setup all initial network connections -*/ -int setup_network_connections(void) -{ - config_t const *cfg; -cp - init_connections(); - init_subnets(); + for(enode = n->edge_tree->head; enode; enode = enext) + { + enext = enode->next; + e = (edge_t *)enode->data; - if((cfg = get_config_val(config, config_pingtimeout)) == NULL) - timeout = 60; - else - { - timeout = cfg->data.val; - if(timeout < 1) + for(cnode = connection_tree->head; cnode; cnode = cnode->next) { - timeout = 86400; + c = (connection_t *)cnode->data; + if(c->status.active) + send_del_edge(c, e); } - } - - if(setup_tap_fd() < 0) - return -1; - - /* Run tinc-up script to further initialize the tap interface */ - execute_script("tinc-up"); - - if(setup_myself() < 0) - return -1; - - if(!(cfg = get_config_val(config, config_connectto))) - /* No upstream IP given, we're listen only. */ - return 0; - - while(cfg) - { - upstreamcfg = cfg->next; - if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */ - return 0; - cfg = get_config_val(upstreamcfg, config_connectto); /* Or else we try the next ConnectTo line */ - } - - if(do_detach) - { - signal(SIGALRM, sigalrm_handler); - upstreamcfg = config; - seconds_till_retry = MAXTIMEOUT; - syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in %d seconds"), seconds_till_retry); - alarm(seconds_till_retry); - } - else - return -1; - -cp - return 0; -} -/* - close all open network connections -*/ -void close_network_connections(void) -{ - avl_node_t *node; - connection_t *p; -cp - for(node = connection_tree->head; node; node = node->next) - { - p = (connection_t *)node->data; - p->status.outgoing = 0; - p->status.active = 0; - terminate_connection(p); - } - - if(myself) - if(myself->status.active) - { - close(myself->meta_socket); - free_connection(myself); - myself = NULL; + edge_del(e); } - close(tap_fd); - - /* Execute tinc-down script right after shutting down the interface */ - execute_script("tinc-down"); - - destroy_connection_tree(); -cp - return; -} - -/* - handle an incoming tcp connect call and open - a connection to it. -*/ -connection_t *create_new_connection(int sfd) -{ - connection_t *p; - struct sockaddr_in ci; - int len = sizeof(ci); -cp - p = 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; + node_del(n); } - - p->name = unknown; - p->address = ntohl(ci.sin_addr.s_addr); - p->hostname = hostlookup(ci.sin_addr.s_addr); - p->port = htons(ci.sin_port); /* This one will be overwritten later */ - p->meta_socket = sfd; - p->status.meta = 1; - p->buffer = xmalloc(MAXBUFSIZE); - p->buflen = 0; - p->last_ping_time = time(NULL); - - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_NOTICE, _("Connection from %s port %d"), - p->hostname, htons(ci.sin_port)); - - p->allow_request = ID; + } cp - return p; } /* - put all file descriptors in an fd_set array + 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 build_fdset(fd_set *fs) +void terminate_connection(connection_t *c, int report) { avl_node_t *node; - connection_t *p; -cp - FD_ZERO(fs); - - FD_SET(myself->socket, fs); - - for(node = connection_tree->head; node; node = node->next) - { - p = (connection_t *)node->data; - if(p->status.meta) - FD_SET(p->meta_socket, fs); - } - - FD_SET(myself->meta_socket, fs); - FD_SET(tap_fd, fs); -cp -} - -/* - 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); - connection_t *cl; -cp - if(getsockopt(myself->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) - { - syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"), - __FILE__, __LINE__, myself->socket); - return; - } - if(x) - { - syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x)); - return; - } - - if((pkt.len = recvfrom(myself->socket, (char *) pkt.salt, MTU, 0, (struct sockaddr *)&from, &fromlen)) <= 0) - { - syslog(LOG_ERR, _("Receiving packet failed: %m")); - return; - } - - cl = lookup_connection(ntohl(from.sin_addr.s_addr), ntohs(from.sin_port)); - - if(!cl) - { - 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; - } - - cl->last_ping_time = time(NULL); - - receive_udppacket(cl, &pkt); + connection_t *other; cp -} - -/* - terminate a connection and notify the other - end before closing the sockets -*/ -void terminate_connection(connection_t *cl) -{ - connection_t *p; - subnet_t *subnet; - avl_node_t *node, *next; -cp - if(cl->status.remove) + if(c->status.remove) return; if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_NOTICE, _("Closing connection with %s (%s)"), - cl->name, cl->hostname); + c->name, c->hostname); - cl->status.remove = 1; + c->status.remove = 1; - if(cl->socket) - close(cl->socket); - if(cl->status.meta) - close(cl->meta_socket); + if(c->socket) + close(c->socket); - if(cl->status.meta) + 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); + } + } - /* Find all connections that were lost because they were behind cl - (the connection that was dropped). */ - - for(node = connection_tree->head; node; node = node->next) - { - p = (connection_t *)node->data; - if(p->nexthop == cl && p != cl) - terminate_connection(p); - } - - /* Inform others of termination if it was still active */ - - if(cl->status.active) - for(node = connection_tree->head; node; node = node->next) - { - p = (connection_t *)node->data; - if(p->status.meta && p->status.active && p != cl) - send_del_host(p, cl); /* Sounds like recursion, but p does not have a meta connection :) */ - } - } + edge_del(c->edge); - /* Remove the associated subnets */ + /* Run MST and SSSP algorithms */ - for(node = cl->subnet_tree->head; node; node = next) - { - next = node->next; - subnet = (subnet_t *)node->data; - subnet_del(subnet); + graph(); } /* Check if this was our outgoing connection */ - if(cl->status.outgoing) + if(c->outgoing) { - cl->status.outgoing = 0; - signal(SIGALRM, sigalrm_handler); - seconds_till_retry = 5; - alarm(seconds_till_retry); - syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 seconds")); + retry_outgoing(c->outgoing); + c->outgoing = NULL; } /* Deactivate */ - cl->status.active = 0; + c->status.active = 0; + if(c->node) + c->node->connection = NULL; + do_prune = 1; cp } @@ -1183,144 +231,118 @@ cp */ void check_dead_connections(void) { - time_t now; - avl_node_t *node; - connection_t *cl; + avl_node_t *node, *next; + connection_t *c; cp - now = time(NULL); - - for(node = connection_tree->head; node; node = node->next) + for(node = connection_tree->head; node; node = next) { - cl = (connection_t *)node->data; - if(cl->status.active && cl->status.meta) + next = node->next; + c = (connection_t *)node->data; + if(c->last_ping_time + pingtimeout < now) { - if(cl->last_ping_time + timeout < now) + if(c->status.active) { - if(cl->status.pinged) + if(c->status.pinged) { if(debug_lvl >= DEBUG_PROTOCOL) - syslog(LOG_INFO, _("%s (%s) didn't respond to PING"), - cl->name, cl->hostname); - cl->status.timeout = 1; - terminate_connection(cl); + 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(cl); + 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 } -/* - accept a new tcp connect and create a - new connection -*/ -int handle_new_meta_connection() -{ - connection_t *ncn; - struct sockaddr client; - int nfd, len = sizeof(client); -cp - if((nfd = accept(myself->meta_socket, &client, &len)) < 0) - { - syslog(LOG_ERR, _("Accepting a new connection failed: %m")); - return -1; - } - - if(!(ncn = create_new_connection(nfd))) - { - shutdown(nfd, 2); - close(nfd); - syslog(LOG_NOTICE, _("Closed attempted connection")); - return 0; - } - - connection_add(ncn); - - send_id(ncn); -cp - return 0; -} - /* check all connections to see if anything happened on their sockets */ void check_network_activity(fd_set *f) { - connection_t *p; + connection_t *c; avl_node_t *node; + int result, i; + int len = sizeof(result); + vpn_packet_t packet; cp - if(FD_ISSET(myself->socket, f)) - handle_incoming_vpn_data(); - - for(node = connection_tree->head; node; node = node->next) + if(FD_ISSET(device_fd, f)) { - p = (connection_t *)node->data; - - if(p->status.remove) - return; - - if(p->status.meta) - if(FD_ISSET(p->meta_socket, f)) - if(receive_meta(p) < 0) - { - terminate_connection(p); - return; - } + if(!read_packet(&packet)) + route_outgoing(&packet); } - if(FD_ISSET(myself->meta_socket, f)) - handle_new_meta_connection(); -cp -} - -/* - read, encrypt and send data that is - available through the ethertap device -*/ -void handle_tap_input(void) -{ - vpn_packet_t vp; - int lenin; -cp - if(taptype == TAP_TYPE_TUNTAP) + for(i = 0; i < listen_sockets; i++) { - if((lenin = read(tap_fd, vp.data, MTU)) <= 0) - { - syslog(LOG_ERR, _("Error while reading from tun/tap device: %m")); - return; - } - vp.len = lenin; + if(FD_ISSET(listen_socket[i].udp, f)) + handle_incoming_vpn_data(listen_socket[i].udp); + if(FD_ISSET(listen_socket[i].tcp, f)) + handle_new_meta_connection(listen_socket[i].tcp); } - else /* ethertap */ + + for(node = connection_tree->head; node; node = node->next) { - if((lenin = read(tap_fd, vp.data - 2, MTU)) <= 0) + c = (connection_t *)node->data; + + if(c->status.remove) + continue; + + if(FD_ISSET(c->socket, f)) { - syslog(LOG_ERR, _("Error while reading from ethertap device: %m")); - return; + if(c->status.connecting) + { + c->status.connecting = 0; + getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len); + if(!result) + finish_connecting(c); + else + { + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_DEBUG, _("Error while connecting to %s (%s): %s"), c->name, c->hostname, strerror(result)); + close(c->socket); + do_outgoing_connection(c); + continue; + } + } + if(receive_meta(c) < 0) + { + terminate_connection(c, c->status.active); + return; + } } - vp.len = lenin - 2; } +cp +} - total_tap_in += vp.len; - - if(lenin < 32) +void prune_connections(void) +{ + connection_t *c; + avl_node_t *node, *next; +cp + for(node = connection_tree->head; node; node = next) { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_WARNING, _("Received short packet from tap device")); - return; - } + next = node->next; + c = (connection_t *)node->data; - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_DEBUG, _("Read packet of length %d from tap device"), vp.len); + if(c->status.remove) + connection_del(c); } - route_outgoing(&vp); + if(!connection_tree->head) + purge(); cp } @@ -1334,76 +356,112 @@ void main_loop(void) int r; time_t last_ping_check; int t; + event_t *event; cp - last_ping_check = time(NULL); + last_ping_check = now; + + srand(now); for(;;) { - tv.tv_sec = timeout; + now = time(NULL); + + tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */ tv.tv_usec = 0; - prune_connection_tree(); + 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 */ + if(errno != EINTR && errno != EAGAIN) { - syslog(LOG_ERR, _("Error while waiting for input: %m")); + syslog(LOG_ERR, _("Error while waiting for input: %s"), strerror(errno)); + dump_connections(); return; } } - if(sighup) - { - syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds")); - sighup = 0; - close_network_connections(); - clear_config(&config); - - if(read_server_config()) - { - syslog(LOG_ERR, _("Unable to reread configuration file, exiting")); - exit(1); - } - - sleep(5); - - if(setup_network_connections()) - return; + if(r > 0) + check_network_activity(&fset); - continue; + if(do_purge) + { + purge(); + do_purge = 0; } - 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); + if(last_ping_check + pingtimeout < now) + { + check_dead_connections(); + last_ping_check = now; + + if(routing_mode== RMODE_SWITCH) + age_mac(); + + age_past_requests(); /* Should we regenerate our key? */ - if(keyexpires < t) + if(keyexpires < now) { if(debug_lvl >= DEBUG_STATUS) syslog(LOG_INFO, _("Regenerating symmetric key")); - RAND_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength); - send_key_changed(myself, NULL); - keyexpires = time(NULL) + keylifetime; + RAND_pseudo_bytes(myself->key, myself->keylength); + send_key_changed(myself->connection, myself); + keyexpires = now + keylifetime; } - } + } - if(r > 0) + + while((event = get_expired_event())) + { + event->handler(event->data); + free(event); + } + + 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; + } + + if(sighup) { - check_network_activity(&fset); + sighup = 0; + close_network_connections(); + exit_configuration(&config_tree); + + syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds...")); + sleep(5); + + init_configuration(&config_tree); + + if(read_server_config()) + { + syslog(LOG_ERR, _("Unable to reread configuration file, exitting.")); + exit(1); + } - /* local tap data */ - if(FD_ISSET(tap_fd, &fset)) - handle_tap_input(); + if(setup_network_connections()) + return; + + continue; } } cp