X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet.c;h=a20de41f84ace1e5a89f911f6ae3415f697365dc;hp=106549e0b4a71cdbbfa41b65de7e23b30e333dcc;hb=1ad2394b8468593030653bbfd0dee879fb711432;hpb=125c4978812cffa5154ce5378a276f43f78417d8 diff --git a/src/net.c b/src/net.c index 106549e0..a20de41f 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 1.35.4.101 2001/03/01 21:32:01 guus Exp $ + $Id: net.c,v 1.35.4.185 2003/04/19 11:12:45 guus Exp $ */ #include "config.h" @@ -25,13 +25,10 @@ #include #include #include -#include -#include -#include #include #include #include -#include +#include #include #include #include @@ -42,34 +39,18 @@ #include #include #include - -#ifdef HAVE_OPENSSL_RAND_H -# include -#else -# include +#ifdef HAVE_NETINET_IN_SYSTM_H +#include #endif - -#ifdef HAVE_OPENSSL_EVP_H -# include -#else -# include -#endif - -#ifdef HAVE_OPENSSL_ERR_H -# include -#else -# include +#include +#ifdef HAVE_NETINET_IP_H +#include #endif - -#ifdef HAVE_OPENSSL_PEM_H -# include -#else -# include +#ifdef HAVE_NETINET_TCP_H +#include #endif -#ifdef HAVE_TUNTAP -#include LINUX_IF_TUN_H -#endif +#include #include #include @@ -84,1086 +65,155 @@ #include "process.h" #include "protocol.h" #include "subnet.h" +#include "graph.h" #include "process.h" +#include "route.h" +#include "device.h" +#include "event.h" #include "system.h" -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; +#ifndef HAVE_RAND_PSEUDO_BYTES +#define RAND_pseudo_bytes RAND_bytes +#endif -subnet_t mymac; +int do_purge = 0; +int sighup = 0; +int sigalrm = 0; -int xsend(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); -cp - outpkt.len = inpkt->len; - - /* Encrypt the packet. */ - - EVP_EncryptInit(&ctx, cl->cipher_pkttype, cl->cipher_pktkey, cl->cipher_pktkey + cl->cipher_pkttype->key_len); - EVP_EncryptUpdate(&ctx, outpkt.data, &outlen, inpkt->data, inpkt->len); - EVP_EncryptFinal(&ctx, outpkt.data + outlen, &outpad); - outlen += outpad + 2; - -/* Bypass - outlen = outpkt.len + 2; - memcpy(&outpkt, inpkt, outlen); -*/ - - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), - outlen, cl->name, cl->hostname); - - 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.len), outlen, 0, (const struct sockaddr *)&to, tolen)) < 0) - { - syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"), - cl->name, cl->hostname); - return -1; - } -cp - return 0; -} +time_t now = 0; -int xrecv(connection_t *cl, vpn_packet_t *inpkt) -{ - vpn_packet_t outpkt; - int outlen, outpad; - EVP_CIPHER_CTX ctx; -cp - outpkt.len = inpkt->len; - - /* Decrypt the packet */ - - EVP_DecryptInit(&ctx, myself->cipher_pkttype, myself->cipher_pktkey, myself->cipher_pktkey + myself->cipher_pkttype->key_len); - EVP_DecryptUpdate(&ctx, outpkt.data, &outlen, inpkt->data, inpkt->len + 8); - EVP_DecryptFinal(&ctx, outpkt.data + outlen, &outpad); - outlen += outpad; - -/* Bypass - outlen = outpkt.len+2; - memcpy(&outpkt, inpkt, outlen); -*/ -cp - return receive_packet(cl, &outpkt); -} +/* Purge edges and subnets of unreachable nodes. Use carefully. */ -int receive_packet(connection_t *cl, vpn_packet_t *packet) +void purge(void) { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_ERR, _("Writing packet of %d bytes to tap device"), - packet->len); - - /* Fix mac address */ - - memcpy(packet->data, mymac.net.mac.address.x, 6); - - 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 + 2; - } -cp - return 0; + avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext; + node_t *n; + edge_t *e; + subnet_t *s; + + cp(); + + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_DEBUG, _("Purging unreachable nodes")); + + for(nnode = node_tree->head; nnode; nnode = nnext) { + nnext = nnode->next; + n = (node_t *) nnode->data; + + if(!n->status.reachable) { + if(debug_lvl >= DEBUG_SCARY_THINGS) + syslog(LOG_DEBUG, _("Purging node %s (%s)"), n->name, + n->hostname); + + for(snode = n->subnet_tree->head; snode; snode = snext) { + snext = snode->next; + s = (subnet_t *) snode->data; + send_del_subnet(broadcast, s); + subnet_del(n, s); + } + + for(enode = n->edge_tree->head; enode; enode = enext) { + enext = enode->next; + e = (edge_t *) enode->data; + send_del_edge(broadcast, e); + edge_del(e); + } + + node_del(n); + } + } } /* - send a packet to the given vpn ip. + put all file descriptors in an fd_set array + While we're at it, purge stuff that needs to be removed. */ -int send_packet(ip_t to, vpn_packet_t *packet) +int build_fdset(fd_set * fs) { - connection_t *cl; - subnet_t *subnet; - vpn_packet_t *copy; -cp - if((subnet = lookup_subnet_ipv4(&to)) == NULL) - { - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_NOTICE, _("Trying to look up %d.%d.%d.%d in connection list failed!"), - IP_ADDR_V(to)); - } - - return -1; - } - - cl = subnet->owner; - - if(cl == myself) - { - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_NOTICE, _("Packet with destination %d.%d.%d.%d is looping back to us!"), - IP_ADDR_V(to)); - } - - return -1; - } - - if(!cl->status.active) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_INFO, _("%s (%s) is not active, dropping packet"), - cl->name, cl->hostname); - - return 0; - } - - 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, packet, sizeof(vpn_packet_t)); - - list_insert_tail(cl->queue, copy); - - if(!cl->status.waitingforkey) - send_req_key(myself, cl); /* Keys should be sent to the host running the tincd */ - return 0; - } - - /* Check if it has to go via UDP or TCP... */ -cp - if(cl->options & OPTION_TCPONLY) - return send_tcppacket(cl, packet); - else - return xsend(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; - xsend(cl, (vpn_packet_t *)node->data); - list_delete_node(cl->queue, node); - } -cp -} + avl_node_t *node, *next; + connection_t *c; + int i, max = 0; + + cp(); + + FD_ZERO(fs); + + for(node = connection_tree->head; node; node = next) { + next = node->next; + c = (connection_t *) node->data; + + if(c->status.remove) { + connection_del(c); + if(!connection_tree->head) + purge(); + } else { + FD_SET(c->socket, fs); + if(c->socket > max) + max = c->socket; + } + } -/* - 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 + for(i = 0; i < listen_sockets; i++) { + FD_SET(listen_socket[i].tcp, fs); + if(listen_socket[i].tcp > max) + max = listen_socket[i].tcp; + FD_SET(listen_socket[i].udp, fs); + if(listen_socket[i].udp > max) + max = listen_socket[i].udp; + } -cp - if((cfg = get_config_val(config, config_tapdevice))) - tapfname = cfg->data.ptr; - else - { -#ifdef HAVE_LINUX -# ifdef HAVE_TUNTAP - tapfname = "/dev/misc/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; + FD_SET(device_fd, fs); + if(device_fd > max) + max = device_fd; + + return max; } /* - set up the socket that we listen on for incoming - (tcp) connections + 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 */ -int setup_listen_meta_socket(int port) +void terminate_connection(connection_t *c, int report) { - 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)); - 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; - } - } - - 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; -} + cp(); -/* - 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; -} + if(c->status.remove) + return; -/* - 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)); - 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)); - - /* 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; -} + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Closing connection with %s (%s)"), + c->name, c->hostname); -/* - 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(*((ip_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; -} + c->status.remove = 1; + c->status.active = 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; -} + if(c->node) + c->node->connection = NULL; -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; -} + if(c->socket) + close(c->socket); -/* - 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->flags = 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->flags |= EXPORTINDIRECTDATA; - - if((cfg = get_config_val(myself->config, config_tcponly))) - if(cfg->data.val == stupid_true) - myself->flags |= 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; - } - - 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 */ - - myself->cipher_pkttype = EVP_bf_cbc(); - - myself->cipher_pktkeylength = myself->cipher_pkttype->key_len + myself->cipher_pkttype->iv_len; - - myself->cipher_pktkey = (char *)xmalloc(myself->cipher_pktkeylength); - RAND_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength); - - if(!(cfg = get_config_val(config, config_keyexpire))) - keylifetime = 3600; - else - keylifetime = cfg->data.val; - - keyexpires = time(NULL) + keylifetime; -cp - /* Check some options */ - - if((cfg = get_config_val(config, config_indirectdata))) - { - if(cfg->data.val == stupid_true) - myself->options |= OPTION_INDIRECT; - } - - if((cfg = get_config_val(config, config_tcponly))) - { - if(cfg->data.val == stupid_true) - myself->options |= OPTION_TCPONLY; - } - /* Activate ourselves */ - - myself->status.active = 1; - - 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 && upstreamcfg == config) - /* No upstream IP given, we're listen only. */ - return; - - 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 -} + if(c->edge) { + if(report) + send_del_edge(broadcast, c->edge); -/* - setup all initial network connections -*/ -int setup_network_connections(void) -{ - config_t const *cfg; -cp - init_connections(); - init_subnets(); - - if((cfg = get_config_val(config, config_pingtimeout)) == NULL) - timeout = 60; - else - { - timeout = cfg->data.val; - if(timeout < 1) - { - timeout = 86400; - } - } - - 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; -} + edge_del(c->edge); -/* - 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; - } - - close(tap_fd); - - /* Execute tinc-down script right after shutting down the interface */ - execute_script("tinc-down"); - - destroy_connection_tree(); -cp - return; -} + /* Run MST and SSSP algorithms */ -/* - 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; - } - - 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; -} + graph(); + } -/* - put all file descriptors in an fd_set array -*/ -void build_fdset(fd_set *fs) -{ - 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 -} + /* Check if this was our outgoing connection */ -/* - receive incoming data from the listening - udp socket and write it to the ethertap - device after being decrypted -*/ -int handle_incoming_vpn_data(void) -{ - vpn_packet_t pkt; - int x, l = sizeof(x); - int lenin; - 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 -1; - } - if(x) - { - syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x)); - return -1; - } - - if((lenin = recvfrom(myself->socket, (char *) &(pkt.len), MTU, 0, (struct sockaddr *)&from, &fromlen)) <= 0) - { - syslog(LOG_ERR, _("Receiving packet failed: %m")); - return -1; - } - - 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 0; - } - - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), lenin, - cl->name, cl->hostname); - } - -cp - return xrecv(cl, &pkt); -} - -/* - 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) - 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); - seconds_till_retry = 5; - alarm(seconds_till_retry); - syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 seconds")); - } - - /* Inactivate */ - - cl->status.active = 0; -cp + if(c->outgoing) { + retry_outgoing(c->outgoing); + c->outgoing = NULL; + } } /* @@ -1176,145 +226,99 @@ cp */ void check_dead_connections(void) { - time_t now; - avl_node_t *node; - connection_t *cl; -cp - now = time(NULL); - - for(node = connection_tree->head; node; node = node->next) - { - cl = (connection_t *)node->data; - if(cl->status.active && cl->status.meta) - { - if(cl->last_ping_time + timeout < now) - { - if(cl->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); - } - else - { - send_ping(cl); - } - } - } - } -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; + avl_node_t *node, *next; + connection_t *c; + + cp(); + + for(node = connection_tree->head; node; node = next) { + next = node->next; + c = (connection_t *) node->data; + + if(c->last_ping_time + pingtimeout < 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(c->status.remove) { + syslog(LOG_WARNING, _("Old connection_t for %s (%s) status %04x still lingering, deleting..."), + c->name, c->hostname, c->status); + connection_del(c); + continue; + } + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_WARNING, _("Timeout from %s (%s) during authentication"), + c->name, c->hostname); + terminate_connection(c, 0); + } + } + } } /* check all connections to see if anything happened on their sockets */ -void check_network_activity(fd_set *f) +void check_network_activity(fd_set * f) { - connection_t *p; - avl_node_t *node; -cp - if(FD_ISSET(myself->socket, f)) - handle_incoming_vpn_data(); - - for(node = connection_tree->head; node; node = node->next) - { - 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(FD_ISSET(myself->meta_socket, f)) - handle_new_meta_connection(); -cp -} + connection_t *c; + avl_node_t *node; + int result, i; + int len = sizeof(result); + vpn_packet_t packet; -/* - 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) - { - 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 += lenin; - - if(lenin < 32) - { - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_WARNING, _("Received short packet from tap device")); - return; - } - - if(debug_lvl >= DEBUG_TRAFFIC) - { - syslog(LOG_DEBUG, _("Read packet of length %d from tap device"), vp.len); - } - - send_packet(ntohl(*((unsigned long*)(&vp.data[30]))), &vp); -cp + cp(); + + if(FD_ISSET(device_fd, f)) { + if(!read_packet(&packet)) + route_outgoing(&packet); + } + + for(node = connection_tree->head; node; node = node->next) { + c = (connection_t *) node->data; + + if(c->status.remove) + continue; + + if(FD_ISSET(c->socket, f)) { + 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); + continue; + } + } + } + + for(i = 0; i < listen_sockets; i++) { + 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); + } } /* @@ -1322,82 +326,130 @@ cp */ void main_loop(void) { - fd_set fset; - struct timeval tv; - int r; - time_t last_ping_check; - int t; -cp - last_ping_check = time(NULL); - - for(;;) - { - tv.tv_sec = timeout; - tv.tv_usec = 0; - - prune_connection_tree(); - 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(); - 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; - - 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_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength); - send_key_changed(myself, NULL); - keyexpires = time(NULL) + keylifetime; - } + fd_set fset; + struct timeval tv; + int r, maxfd; + time_t last_ping_check, last_config_check; + event_t *event; + + cp(); + + last_ping_check = now; + last_config_check = now; + srand(now); + + for(;;) { + now = time(NULL); + + tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */ + tv.tv_usec = 0; + + maxfd = build_fdset(&fset); + + r = select(maxfd + 1, &fset, NULL, NULL, &tv); + + if(r < 0) { + if(errno != EINTR && errno != EAGAIN) { + syslog(LOG_ERR, _("Error while waiting for input: %s"), + strerror(errno)); + cp_trace(); + dump_connections(); + return; + } + + continue; + } + + check_network_activity(&fset); + + if(do_purge) { + purge(); + do_purge = 0; + } + + /* Let's check if everybody is still alive */ + + 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 < now) { + if(debug_lvl >= DEBUG_STATUS) + syslog(LOG_INFO, _("Regenerating symmetric key")); + + RAND_pseudo_bytes(myself->key, myself->keylength); + send_key_changed(broadcast, myself); + keyexpires = now + keylifetime; + } + } + + + 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) { + connection_t *c; + avl_node_t *node; + char *fname; + struct stat s; + + sighup = 0; + + /* Reread our own configuration file */ + + exit_configuration(&config_tree); + init_configuration(&config_tree); + + if(read_server_config()) { + syslog(LOG_ERR, _("Unable to reread configuration file, exitting.")); + exit(1); + } + + /* Close connections to hosts that have a changed or deleted host config file */ + + for(node = connection_tree->head; node; node = node->next) { + c = (connection_t *) node->data; + + if(c->outgoing) { + free(c->outgoing->name); + 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 = now; + + /* Try to make outgoing connections */ + + try_outgoing_connections(); + + continue; + } } - - if(r > 0) - { - check_network_activity(&fset); - - /* local tap data */ - if(FD_ISSET(tap_fd, &fset)) - handle_tap_input(); - } - } -cp }