X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet.c;h=35d9563ce9b9efb6586927008446c38e70e455e4;hp=9c1dd3b89f2541c513990c3370087852fe7dcc96;hb=94497336efc1cc60561575e74d420e9e8e8c657e;hpb=04ec0b82ab9c6a2662300a9257a5aff1c4dd56e7 diff --git a/src/net.c b/src/net.c index 9c1dd3b8..35d9563c 100644 --- a/src/net.c +++ b/src/net.c @@ -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 1.35.4.115 2001/06/21 16:16:31 guus Exp $ + $Id: net.c,v 1.35.4.140 2001/10/28 08:41:19 guus Exp $ */ #include "config.h" @@ -45,37 +45,14 @@ #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 +#include +#include +#include -#ifdef HAVE_OPENSSL_PEM_H -# include -#else -# include +#ifndef HAVE_RAND_PSEUDO_BYTES +#define RAND_pseudo_bytes RAND_bytes #endif -#warning oi1 -#ifdef HAVE_TUNTAP -#warning oi2 -#include LINUX_IF_TUN_H -#endif -#warning oi3 - #include #include #include @@ -91,23 +68,61 @@ #include "subnet.h" #include "process.h" #include "route.h" +#include "device.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; +int maxtimeout = 900; int seconds_till_retry = 5; +int tcp_socket = -1; +int udp_socket = -1; + int keylifetime = 0; int keyexpires = 0; -void send_udppacket(connection_t *cl, vpn_packet_t *inpkt) +/* VPN packet I/O */ + +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 */ + + 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); + + receive_packet(n, &outpkt); +cp +} + +void receive_tcppacket(connection_t *c, char *buffer, int len) +{ + vpn_packet_t outpkt; +cp + outpkt.len = len; + memcpy(outpkt.data, buffer, len); + + receive_packet(c->node, &outpkt); +cp +} + +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); + + route_incoming(n, packet); +cp +} + +void send_udppacket(node_t *n, vpn_packet_t *inpkt) { vpn_packet_t outpkt; int outlen, outpad; @@ -116,11 +131,11 @@ void send_udppacket(connection_t *cl, vpn_packet_t *inpkt) socklen_t tolen = sizeof(to); vpn_packet_t *copy; cp - if(!cl->status.validkey) + if(!n->status.validkey) { if(debug_lvl >= DEBUG_TRAFFIC) syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"), - cl->name, cl->hostname); + n->name, n->hostname); /* Since packet is on the stack of handle_tap_input(), we have to make a copy of it first. */ @@ -128,113 +143,46 @@ cp copy = xmalloc(sizeof(vpn_packet_t)); memcpy(copy, inpkt, sizeof(vpn_packet_t)); - list_insert_tail(cl->queue, copy); + list_insert_tail(n->queue, copy); - if(!cl->status.waitingforkey) - send_req_key(myself, cl); + if(!n->status.waitingforkey) + send_req_key(n->nexthop->connection, myself, n); return; } /* Encrypt the packet. */ - RAND_bytes(inpkt->salt, sizeof(inpkt->salt)); + RAND_pseudo_bytes(inpkt->salt, sizeof(inpkt->salt)); - EVP_EncryptInit(&ctx, cl->cipher_pkttype, cl->cipher_pktkey, cl->cipher_pktkey + cl->cipher_pkttype->key_len); + 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; - total_socket_out += outlen; - to.sin_family = AF_INET; - to.sin_addr.s_addr = htonl(cl->address); - to.sin_port = htons(cl->port); + to.sin_addr.s_addr = htonl(n->address); + to.sin_port = htons(n->port); - if((sendto(myself->socket, (char *) outpkt.salt, outlen, 0, (const struct sockaddr *)&to, tolen)) < 0) + 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"), - cl->name, cl->hostname); + n->name, n->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); - - total_socket_in += outlen; - - 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) +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, cl->name, cl->hostname); + packet->len, n->name, n->hostname); - if(cl == myself) + if(n == myself) { if(debug_lvl >= DEBUG_TRAFFIC) { @@ -244,32 +192,40 @@ cp return; } - if(!cl->status.active) + if(!n->status.active) { if(debug_lvl >= DEBUG_TRAFFIC) syslog(LOG_INFO, _("%s (%s) is not active, dropping packet"), - cl->name, cl->hostname); + n->name, n->hostname); return; } +/* FIXME + if(n->via == myself) + via = n->nexthop; + else + via = n->via; - /* Check if it has to go via TCP or UDP... */ -cp - if((cl->options | myself->options) & OPTION_TCPONLY) + 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(cl, packet)) - terminate_connection(cl); + if(send_tcppacket(via->connection, packet)) + terminate_connection(via->connection, 1); } else - send_udppacket(cl, packet); + send_udppacket(via, packet); +*/ } -/* Broadcast a packet to all active connections */ +/* Broadcast a packet to all active direct connections */ -void broadcast_packet(connection_t *from, vpn_packet_t *packet) +void broadcast_packet(node_t *from, vpn_packet_t *packet) { avl_node_t *node; - connection_t *cl; + connection_t *c; cp if(debug_lvl >= DEBUG_TRAFFIC) syslog(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"), @@ -277,116 +233,39 @@ cp for(node = connection_tree->head; node; node = node->next) { - cl = (connection_t *)node->data; - if(cl->status.meta && cl != from) - send_packet(cl, packet); + c = (connection_t *)node->data; + if(c->status.active && c != from->nexthop->connection) + send_packet(c->node, packet); } cp } -void flush_queue(connection_t *cl) +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)"), cl->name, cl->hostname); + syslog(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname); - for(node = cl->queue->head; node; node = next) + for(node = n->queue->head; node; node = next) { next = node->next; - send_udppacket(cl, (vpn_packet_t *)node->data); - list_delete_node(cl->queue, node); + send_udppacket(n, (vpn_packet_t *)node->data); + list_delete_node(n->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] = 0xff; - mymac.net.mac.address.x[1] = 0xff; - mymac.net.mac.address.x[2] = 0xff; - mymac.net.mac.address.x[3] = 0xff; - mymac.net.mac.address.x[4] = 0xff; - mymac.net.mac.address.x[5] = 0xff; - -#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; -} +/* Setup sockets */ -/* - set up the socket that we listen on for incoming - (tcp) connections -*/ -int setup_listen_meta_socket(int port) +int setup_listen_socket(int port) { int nfd, flags; struct sockaddr_in a; int option; - config_t const *cfg; + char *interface; + char *address; + ip_mask_t *ipmask; cp if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) { @@ -414,25 +293,29 @@ cp 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; - } - } + 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((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(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))) { @@ -452,10 +335,6 @@ cp return nfd; } -/* - setup the socket for incoming encrypted - data (the udp part) -*/ int setup_vpn_in_socket(int port) { int nfd, flags; @@ -495,185 +374,172 @@ cp return nfd; } -/* - setup an outgoing meta (tcp) socket -*/ -int setup_outgoing_meta_socket(connection_t *cl) +int setup_outgoing_socket(connection_t *c) { 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); + syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname); - if((cfg = get_config_val(cl->config, config_port)) == NULL) - cl->port = 655; - else - cl->port = cfg->data.val; + c->socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); - cl->meta_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); - if(cl->meta_socket == -1) + if(c->socket == -1) { syslog(LOG_ERR, _("Creating socket for %s port %d failed: %m"), - cl->hostname, cl->port); + c->hostname, c->port); return -1; } - /* Bind first to get a fix on our source port */ + /* 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))) + if(bind(c->socket, (struct sockaddr *)&a, sizeof(struct sockaddr))) { - close(cl->meta_socket); + close(c->socket); syslog(LOG_ERR, _("System call `%s' failed: %m"), "bind"); return -1; } - /* Optimize TCP settings */ + */ + + /* Optimize TCP settings? option = 1; - setsockopt(cl->meta_socket, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option)); + setsockopt(c->socket, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option)); #ifdef HAVE_LINUX - setsockopt(cl->meta_socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); + setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); option = IPTOS_LOWDELAY; - setsockopt(cl->meta_socket, SOL_IP, IP_TOS, &option, sizeof(option)); + setsockopt(c->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); + a.sin_port = htons(c->port); + a.sin_addr.s_addr = htonl(c->address); - if(connect(cl->meta_socket, (struct sockaddr *)&a, sizeof(a)) == -1) + if(connect(c->socket, (struct sockaddr *)&a, sizeof(a)) == -1) { - close(cl->meta_socket); - syslog(LOG_ERR, _("%s port %hd: %m"), cl->hostname, cl->port); + close(c->socket); + syslog(LOG_ERR, _("%s port %hd: %m"), c->hostname, c->port); return -1; } - flags = fcntl(cl->meta_socket, F_GETFL); - if(fcntl(cl->meta_socket, F_SETFL, flags | O_NONBLOCK) < 0) + flags = fcntl(c->socket, F_GETFL); + + if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) { - close(cl->meta_socket); + close(c->socket); syslog(LOG_ERR, _("fcntl for %s port %d: %m"), - cl->hostname, cl->port); + c->hostname, c->port); return -1; } if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_INFO, _("Connected to %s port %hd"), - cl->hostname, cl->port); - - cl->status.meta = 1; + c->hostname, c->port); cp return 0; } -/* - Setup an outgoing meta connection. -*/ int setup_outgoing_connection(char *name) { - connection_t *ncn; + connection_t *c; 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); + c = new_connection(); + c->name = xstrdup(name); - if(read_host_config(ncn)) + init_configuration(&c->config_tree); + read_connection_config(c); + + if(!get_config_string(lookup_config(c->config_tree, "Address"), &c->hostname)) { - syslog(LOG_ERR, _("Error reading host configuration file for %s"), ncn->name); - free_connection(ncn); + syslog(LOG_ERR, _("No address specified for %s"), c->name); + free_connection(c); return -1; } - if(!(cfg = get_config_val(ncn->config, config_address))) + if(!get_config_port(lookup_config(c->config_tree, "Port"), &c->port)) { - syslog(LOG_ERR, _("No address specified for %s"), ncn->name); - free_connection(ncn); + syslog(LOG_ERR, _("No port specified for %s"), c->name); + free_connection(c); return -1; } - if(!(h = gethostbyname(cfg->data.ptr))) + if(!(h = gethostbyname(c->hostname))) { - syslog(LOG_ERR, _("Error looking up `%s': %m"), cfg->data.ptr); - free_connection(ncn); + syslog(LOG_ERR, _("Error looking up `%s': %m"), c->hostname); + free_connection(c); return -1; } - ncn->address = ntohl(*((ipv4_t*)(h->h_addr_list[0]))); - ncn->hostname = hostlookup(htonl(ncn->address)); + c->address = ntohl(*((ipv4_t*)(h->h_addr_list[0]))); + c->hostname = hostlookup(htonl(c->address)); - if(setup_outgoing_meta_socket(ncn) < 0) + if(setup_outgoing_socket(c) < 0) { - syslog(LOG_ERR, _("Could not set up a meta connection to %s"), - ncn->hostname); - free_connection(ncn); + syslog(LOG_ERR, _("Could not set up a meta connection to %s (%s)"), + c->name, c->hostname); + free_connection(c); return -1; } - ncn->status.outgoing = 1; - ncn->buffer = xmalloc(MAXBUFSIZE); - ncn->buflen = 0; - ncn->last_ping_time = time(NULL); + c->status.outgoing = 1; + c->last_ping_time = time(NULL); - connection_add(ncn); + connection_add(c); - send_id(ncn); + send_id(c); cp return 0; } -int read_rsa_public_key(connection_t *cl) +int read_rsa_public_key(connection_t *c) { - config_t const *cfg; FILE *fp; char *fname; + char *key; void *result; cp - if(!cl->rsa_key) - cl->rsa_key = RSA_new(); + if(!c->rsa_key) + c->rsa_key = RSA_new(); /* First, check for simple PublicKey statement */ - if((cfg = get_config_val(cl->config, config_publickey))) + if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) { - BN_hex2bn(&cl->rsa_key->n, cfg->data.ptr); - BN_hex2bn(&cl->rsa_key->e, "FFFF"); + 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((cfg = get_config_val(cl->config, config_publickeyfile))) + if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) { - if(is_safe_path(cfg->data.ptr)) + if(is_safe_path(fname)) { - if((fp = fopen(cfg->data.ptr, "r")) == NULL) + if((fp = fopen(fname, "r")) == NULL) { syslog(LOG_ERR, _("Error reading RSA public key file `%s': %m"), - cfg->data.ptr); + fname); return -1; } - result = PEM_read_RSAPublicKey(fp, &cl->rsa_key, NULL, NULL); + 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"), - cfg->data.ptr); + fname); return -1; } return 0; @@ -684,53 +550,55 @@ cp /* Else, check if a harnessed public key is in the config file */ - asprintf(&fname, "%s/hosts/%s", confbase, cl->name); + result = NULL; + + asprintf(&fname, "%s/hosts/%s", confbase, c->name); if((fp = fopen(fname, "r"))) { - result = PEM_read_RSAPublicKey(fp, &cl->rsa_key, NULL, NULL); + result = PEM_read_RSAPublicKey(fp, &c->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; + if(result) + return 0; + else + { + syslog(LOG_ERR, _("No public key for %s specified!"), c->name); + return -1; + } } int read_rsa_private_key(void) { - config_t const *cfg; FILE *fp; void *result; + char *fname, *key; cp - if(!myself->rsa_key) - myself->rsa_key = RSA_new(); + if(!myself->connection->rsa_key) + myself->connection->rsa_key = RSA_new(); - if((cfg = get_config_val(config, config_privatekey))) + if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) { - BN_hex2bn(&myself->rsa_key->d, cfg->data.ptr); - BN_hex2bn(&myself->rsa_key->e, "FFFF"); + BN_hex2bn(&myself->connection->rsa_key->d, key); + BN_hex2bn(&myself->connection->rsa_key->e, "FFFF"); } - else if((cfg = get_config_val(config, config_privatekeyfile))) + else if(get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname)) { - if((fp = fopen(cfg->data.ptr, "r")) == NULL) + if((fp = fopen(fname, "r")) == NULL) { syslog(LOG_ERR, _("Error reading RSA private key file `%s': %m"), - cfg->data.ptr); + fname); return -1; } - result = PEM_read_RSAPrivateKey(fp, &myself->rsa_key, NULL, NULL); + 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"), - cfg->data.ptr); + fname); return -1; } } @@ -744,108 +612,110 @@ cp } /* - Configure connection_t myself and set up the local sockets (listen only) + Configure node_t myself and set up the local sockets (listen only) */ int setup_myself(void) { - config_t const *cfg; - config_t *next; - subnet_t *net; + config_t *cfg; + subnet_t *subnet; + char *name, *mode; + int choice; cp - myself = new_connection(); + myself = new_node(); + myself->connection = new_connection(); + init_configuration(&myself->connection->config_tree); asprintf(&myself->hostname, _("MYSELF")); - myself->options = 0; - myself->protocol_version = PROT_CURRENT; + asprintf(&myself->connection->hostname, _("MYSELF")); - if(!(cfg = get_config_val(config, config_name))) /* Not acceptable */ + 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; } - else - asprintf(&myself->name, "%s", (char*)cfg->data.val); - if(check_id(myself->name)) + 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_host_config(myself)) + if(read_connection_config(myself->connection)) { syslog(LOG_ERR, _("Cannot open host configuration file for myself!")); return -1; } - if(read_rsa_public_key(myself)) + if(read_rsa_public_key(myself->connection)) return -1; cp /* - if(RSA_check_key(myself->rsa_key) != 1) + if(RSA_check_key(rsa_key) != 1) { syslog(LOG_ERR, _("Invalid public/private keypair!")); return -1; } */ - if(!(cfg = get_config_val(myself->config, config_port))) + if(!get_config_port(lookup_config(myself->connection->config_tree, "Port"), &myself->port)) myself->port = 655; - else - myself->port = cfg->data.val; + + myself->connection->port = myself->port; /* 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) + cfg = lookup_config(myself->connection->config_tree, "Subnet"); + + while(cfg) { - net = new_subnet(); - net->type = SUBNET_IPV4; - net->net.ipv4.address = cfg->data.ip->address; - net->net.ipv4.mask = cfg->data.ip->mask; + if(!get_config_subnet(cfg, &subnet)) + return -1; - /* Teach newbies what subnets are... */ + subnet_add(myself, subnet); - 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); + cfg = lookup_config_next(myself->connection->config_tree, cfg); } cp /* Check some options */ - if((cfg = get_config_val(config, config_indirectdata))) - if(cfg->data.val == stupid_true) + if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice)) + if(choice) myself->options |= OPTION_INDIRECT; - if((cfg = get_config_val(config, config_tcponly))) - if(cfg->data.val == stupid_true) + if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice)) + if(choice) myself->options |= OPTION_TCPONLY; - if((cfg = get_config_val(myself->config, config_indirectdata))) - if(cfg->data.val == stupid_true) + if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice)) + if(choice) myself->options |= OPTION_INDIRECT; - if((cfg = get_config_val(myself->config, config_tcponly))) - if(cfg->data.val == stupid_true) + 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((cfg = get_config_val(config, config_mode))) + if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) { - if(!strcasecmp(cfg->data.ptr, "router")) + if(!strcasecmp(mode, "router")) routing_mode = RMODE_ROUTER; - else if (!strcasecmp(cfg->data.ptr, "switch")) + else if (!strcasecmp(mode, "switch")) routing_mode = RMODE_SWITCH; - else if (!strcasecmp(cfg->data.ptr, "hub")) + else if (!strcasecmp(mode, "hub")) routing_mode = RMODE_HUB; else { @@ -859,13 +729,13 @@ cp cp /* Open sockets */ - if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0) + if((tcp_socket = setup_listen_socket(myself->port)) < 0) { syslog(LOG_ERR, _("Unable to set up a listening TCP socket!")); return -1; } - if((myself->socket = setup_vpn_in_socket(myself->port)) < 0) + if((udp_socket = setup_vpn_in_socket(myself->port)) < 0) { syslog(LOG_ERR, _("Unable to set up a listening UDP socket!")); return -1; @@ -873,96 +743,52 @@ cp cp /* Generate packet encryption key */ - myself->cipher_pkttype = EVP_bf_cbc(); + myself->cipher = EVP_bf_cbc(); - myself->cipher_pktkeylength = myself->cipher_pkttype->key_len + myself->cipher_pkttype->iv_len; + myself->keylength = myself->cipher->key_len + myself->cipher->iv_len; - myself->cipher_pktkey = (char *)xmalloc(myself->cipher_pktkeylength); - RAND_pseudo_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength); + myself->key = (char *)xmalloc(myself->keylength); + RAND_pseudo_bytes(myself->key, myself->keylength); - if(!(cfg = get_config_val(config, config_keyexpire))) + if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime)) keylifetime = 3600; - else - keylifetime = cfg->data.val; keyexpires = time(NULL) + keylifetime; cp + /* Done */ - /* Activate ourselves */ - + 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; } -RETSIGTYPE -sigalrm_handler(int a) -{ - config_t const *cfg; -cp - cfg = get_config_val(upstreamcfg, config_connectto); - - if(!cfg) - { - if(upstreamcfg == config) - { - /* 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 */ - { - signal(SIGALRM, SIG_IGN); - return; - } - 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 -} - /* setup all initial network connections */ int setup_network_connections(void) { - config_t const *cfg; cp init_connections(); init_subnets(); + init_nodes(); + init_vertices(); - if((cfg = get_config_val(config, config_pingtimeout)) == NULL) - timeout = 60; - else + if(get_config_int(lookup_config(config_tree, "PingTimeout"), &timeout)) { - timeout = cfg->data.val; if(timeout < 1) { timeout = 86400; } - } + } + else + timeout = 60; - if(setup_tap_fd() < 0) + if(setup_device() < 0) return -1; /* Run tinc-up script to further initialize the tap interface */ @@ -971,29 +797,8 @@ cp 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; - + signal(SIGALRM, try_outgoing_connections); + alarm(5); cp return 0; } @@ -1003,31 +808,24 @@ cp */ void close_network_connections(void) { - avl_node_t *node; - connection_t *p; + avl_node_t *node, *next; + connection_t *c; cp - for(node = connection_tree->head; node; node = node->next) + for(node = connection_tree->head; node; node = next) { - p = (connection_t *)node->data; - p->status.outgoing = 0; - p->status.active = 0; - terminate_connection(p); + next = node->next; + c = (connection_t *)node->data; + c->status.outgoing = 0; + terminate_connection(c, 0); } - if(myself) - if(myself->status.active) - { - close(myself->meta_socket); - free_connection(myself); - myself = NULL; - } +// terminate_connection(myself, 0); - close(tap_fd); +// destroy_trees(); - /* Execute tinc-down script right after shutting down the interface */ execute_script("tinc-down"); - destroy_connection_tree(); + close_device(); cp return; } @@ -1038,11 +836,11 @@ cp */ connection_t *create_new_connection(int sfd) { - connection_t *p; + connection_t *c; struct sockaddr_in ci; int len = sizeof(ci); cp - p = new_connection(); + c = new_connection(); if(getpeername(sfd, (struct sockaddr *) &ci, (socklen_t *) &len) < 0) { @@ -1052,23 +850,19 @@ cp return NULL; } - asprintf(&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); + 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"), - p->hostname, htons(ci.sin_port)); + c->hostname, htons(ci.sin_port)); - p->allow_request = ID; + c->allow_request = ID; cp - return p; + return c; } /* @@ -1077,21 +871,19 @@ cp void build_fdset(fd_set *fs) { avl_node_t *node; - connection_t *p; + connection_t *c; 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); + c = (connection_t *)node->data; + FD_SET(c->socket, fs); } - FD_SET(myself->meta_socket, fs); - FD_SET(tap_fd, fs); + FD_SET(tcp_socket, fs); + FD_SET(udp_socket, fs); + FD_SET(device_fd, fs); cp } @@ -1106,12 +898,12 @@ void handle_incoming_vpn_data(void) int x, l = sizeof(x); struct sockaddr_in from; socklen_t fromlen = sizeof(from); - connection_t *cl; + node_t *n; cp - if(getsockopt(myself->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__, myself->socket); + __FILE__, __LINE__, udp_socket); return; } if(x) @@ -1120,97 +912,38 @@ cp return; } - if((pkt.len = recvfrom(myself->socket, (char *) pkt.salt, MTU, 0, (struct sockaddr *)&from, &fromlen)) <= 0) + if((pkt.len = recvfrom(udp_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)); + n = lookup_node_udp(ntohl(from.sin_addr.s_addr), ntohs(from.sin_port)); - if(!cl) + 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; } - - cl->last_ping_time = time(NULL); - - receive_udppacket(cl, &pkt); +/* + if(n->connection) + n->connection->last_ping_time = time(NULL); +*/ + receive_udppacket(n, &pkt); cp } /* - terminate a connection and notify the other - end before closing the sockets + 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 *cl) +void terminate_connection(connection_t *c, int report) { - connection_t *p; - subnet_t *subnet; - avl_node_t *node, *next; -cp - if(cl->status.remove) - return; - - if(debug_lvl >= DEBUG_CONNECTIONS) - syslog(LOG_NOTICE, _("Closing connection with %s (%s)"), - cl->name, cl->hostname); - - cl->status.remove = 1; - - if(cl->socket) - close(cl->socket); - if(cl->status.meta) - close(cl->meta_socket); - - if(cl->status.meta) - { - - /* 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 :) */ - } - } - - /* Remove the associated subnets */ - - for(node = cl->subnet_tree->head; node; node = next) - { - next = node->next; - subnet = (subnet_t *)node->data; - subnet_del(subnet); - } - - /* Check if this was our outgoing connection */ - - if(cl->status.outgoing) - { - cl->status.outgoing = 0; - signal(SIGALRM, sigalrm_handler); - alarm(seconds_till_retry); - syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in %d seconds"), seconds_till_retry); - } - - /* Deactivate */ - - cl->status.active = 0; -cp + /* Needs a serious rewrite. */ } /* @@ -1224,31 +957,39 @@ 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 + timeout < 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); + 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 @@ -1260,107 +1001,121 @@ cp */ int handle_new_meta_connection() { - connection_t *ncn; + connection_t *new; struct sockaddr client; - int nfd, len = sizeof(client); + int fd, len = sizeof(client); cp - if((nfd = accept(myself->meta_socket, &client, &len)) < 0) + if((fd = accept(tcp_socket, &client, &len)) < 0) { syslog(LOG_ERR, _("Accepting a new connection failed: %m")); return -1; } - if(!(ncn = create_new_connection(nfd))) + if(!(new = create_new_connection(fd))) { - shutdown(nfd, 2); - close(nfd); + shutdown(fd, 2); + close(fd); syslog(LOG_NOTICE, _("Closed attempted connection")); return 0; } - connection_add(ncn); + connection_add(new); - send_id(ncn); + send_id(new); cp return 0; } -/* - check all connections to see if anything - happened on their sockets +void randomized_alarm(int seconds) +{ + unsigned char r; + RAND_pseudo_bytes(&r, 1); + alarm((seconds * (int)r) / 128 + 1); +} + +/* 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. */ -void check_network_activity(fd_set *f) + +RETSIGTYPE +try_outgoing_connections(int a) { - connection_t *p; - avl_node_t *node; + static config_t *cfg = NULL; + static int retry = 0; + char *name; cp - if(FD_ISSET(myself->socket, f)) - handle_incoming_vpn_data(); + if(!cfg) + cfg = lookup_config(config_tree, "ConnectTo"); - for(node = connection_tree->head; node; node = node->next) + if(!cfg) + return; + + while(cfg) { - p = (connection_t *)node->data; + get_config_string(cfg, &name); + cfg = lookup_config_next(config_tree, cfg); /* Next time skip to next ConnectTo line */ - if(p->status.remove) - return; + if(!setup_outgoing_connection(name)) /* function returns 0 when there are no problems */ + retry = 1; - if(p->status.meta) - if(FD_ISSET(p->meta_socket, f)) - if(receive_meta(p) < 0) - { - terminate_connection(p); - return; - } } - if(FD_ISSET(myself->meta_socket, f)) - handle_new_meta_connection(); + 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 } /* - read, encrypt and send data that is - available through the ethertap device + check all connections to see if anything + happened on their sockets */ -void handle_tap_input(void) +void check_network_activity(fd_set *f) { - vpn_packet_t vp; - int lenin; + connection_t *c; + avl_node_t *node; cp - if(taptype == TAP_TYPE_TUNTAP) - { - if((lenin = read(tap_fd, vp.data, MTU)) <= 0) - { - syslog(LOG_ERR, _("Error while reading from tun/tap device: %m")); - return; - } - vp.len = lenin; - } - else /* ethertap */ - { - if((lenin = read(tap_fd, vp.data - 2, MTU)) <= 0) - { - syslog(LOG_ERR, _("Error while reading from ethertap device: %m")); - return; - } - vp.len = lenin - 2; - } - - total_tap_in += vp.len; + if(FD_ISSET(udp_socket, f)) + handle_incoming_vpn_data(); - if(lenin < 32) + for(node = connection_tree->head; node; node = node->next) { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_WARNING, _("Received short packet from tap device")); - return; - } + 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) + return; + + if(FD_ISSET(c->socket, f)) + if(receive_meta(c) < 0) + { + terminate_connection(c, c->status.active); + return; + } } - route_outgoing(&vp); + if(FD_ISSET(tcp_socket, f)) + handle_new_meta_connection(); cp } @@ -1374,6 +1129,7 @@ void main_loop(void) int r; time_t last_ping_check; int t; + vpn_packet_t packet; cp last_ping_check = time(NULL); @@ -1382,7 +1138,6 @@ cp tv.tv_sec = timeout; tv.tv_usec = 0; - prune_connection_tree(); build_fdset(&fset); if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0) @@ -1399,7 +1154,7 @@ cp syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds")); sighup = 0; close_network_connections(); - clear_config(&config); + exit_configuration(&config_tree); if(read_server_config()) { @@ -1431,8 +1186,8 @@ cp if(debug_lvl >= DEBUG_STATUS) syslog(LOG_INFO, _("Regenerating symmetric key")); - RAND_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength); - send_key_changed(myself, NULL); + RAND_pseudo_bytes(myself->key, myself->keylength); + send_key_changed(myself->connection, myself); keyexpires = time(NULL) + keylifetime; } } @@ -1442,8 +1197,13 @@ cp check_network_activity(&fset); /* local tap data */ - if(FD_ISSET(tap_fd, &fset)) - handle_tap_input(); + if(FD_ISSET(device_fd, &fset)) + { + if(read_packet(&packet)) + return; + else + route_outgoing(&packet); + } } } cp