X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet.c;h=8d92cc10088c305ded504ce6246648a9ba2f163e;hp=34279824eda4c5dadf66f299e2369b928670fe04;hb=485f7a5043a4b3345bd02e5063502603550b4c76;hpb=9fd02ffcb0cacf3de26e876de5f30510bff137a3 diff --git a/src/net.c b/src/net.c index 34279824..8d92cc10 100644 --- a/src/net.c +++ b/src/net.c @@ -1,6 +1,7 @@ /* net.c -- most of the network code - Copyright (C) 1998,1999,2000 Ivo Timmermans + Copyright (C) 1998,1999,2000 Ivo Timmermans , + 2000 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -15,11 +16,12 @@ You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id: net.c,v 1.35.4.76 2000/11/16 22:11:40 zarq Exp $ */ #include "config.h" -#include #include #include #include @@ -28,108 +30,149 @@ #include #include #include -#include #include #include #include #include +#include +/* SunOS really wants sys/socket.h BEFORE net/if.h, + and FreeBSD wants these lines below the rest. */ +#include +#include +#include + +#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_TUNTAP +#include LINUX_IF_TUN_H +#endif -#include #include #include #include "conf.h" -#include "encr.h" +#include "connlist.h" +#include "list.h" +#include "meta.h" #include "net.h" #include "netutl.h" +#include "process.h" #include "protocol.h" +#include "subnet.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; -/* The global list of existing connections */ -conn_list_t *conn_list = NULL; -conn_list_t *myself = NULL; +int keylifetime = 0; +int keyexpires = 0; -/* - strip off the MAC adresses of an ethernet frame -*/ -void strip_mac_addresses(vpn_packet_t *p) -{ - unsigned char tmp[MAXSIZE]; -cp - memcpy(tmp, p->data, p->len); - p->len -= 12; - memcpy(p->data, &tmp[12], p->len); -cp -} +char *unknown = NULL; -/* - reassemble MAC addresses -*/ -void add_mac_addresses(vpn_packet_t *p) -{ - unsigned char tmp[MAXSIZE]; -cp - memcpy(&tmp[12], p->data, p->len); - p->len += 12; - tmp[0] = tmp[6] = 0xfe; - tmp[1] = tmp[7] = 0xfd; - *((ip_t*)(&tmp[2])) = (ip_t)(htonl(myself->vpn_ip)); - *((ip_t*)(&tmp[8])) = *((ip_t*)(&tmp[26])); - memcpy(p->data, &tmp[0], p->len); -cp -} +subnet_t mymac; -int xsend(conn_list_t *cl, void *packet) +int xsend(conn_list_t *cl, vpn_packet_t *inpkt) { - int r; - real_packet_t rp; + vpn_packet_t outpkt; + int outlen, outpad; + EVP_CIPHER_CTX ctx; cp - do_encrypt((vpn_packet_t*)packet, &rp, cl->key); - rp.from = htonl(myself->vpn_ip); - rp.data.len = htons(rp.data.len); - rp.len = htons(rp.len); + 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 > 3) - syslog(LOG_ERR, _("Sent %d bytes to %lx"), ntohs(rp.len), cl->vpn_ip); + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), + outlen, cl->name, cl->hostname); - if((r = send(cl->socket, (char*)&rp, ntohs(rp.len), 0)) < 0) + total_socket_out += outlen; + + if((send(cl->socket, (char *) &(outpkt.len), outlen, 0)) < 0) { - syslog(LOG_ERR, _("Error sending data: %m")); + syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"), + cl->name, cl->hostname); return -1; } - - total_socket_out += r; - - cl->want_ping = 1; cp return 0; } -int xrecv(conn_list_t *cl, void *packet) +int xrecv(conn_list_t *cl, vpn_packet_t *inpkt) { - vpn_packet_t vp; - int lenin; + vpn_packet_t outpkt; + int outlen, outpad; + EVP_CIPHER_CTX ctx; cp - do_decrypt((real_packet_t*)packet, &vp, cl->key); - add_mac_addresses(&vp); + outpkt.len = inpkt->len; - if((lenin = write(tap_fd, &vp, vp.len + sizeof(vp.len))) < 0) - syslog(LOG_ERR, _("Can't write to tap device: %m")); - else - total_tap_out += lenin; + /* 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); +*/ + + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_ERR, _("Writing packet of %d bytes to tap device"), + outpkt.len, outlen); + + /* Fix mac address */ + + memcpy(outpkt.data, mymac.net.mac.address.x, 6); - cl->want_ping = 0; - cl->last_ping_time = time(NULL); + if(taptype == TAP_TYPE_TUNTAP) + { + if(write(tap_fd, outpkt.data, outpkt.len) < 0) + syslog(LOG_ERR, _("Can't write to tun/tap device: %m")); + else + total_tap_out += outpkt.len; + } + else /* ethertap */ + { + if(write(tap_fd, outpkt.data - 2, outpkt.len + 2) < 0) + syslog(LOG_ERR, _("Can't write to ethertap device: %m")); + else + total_tap_out += outpkt.len + 2; + } cp return 0; } @@ -142,9 +185,6 @@ void add_queue(packet_queue_t **q, void *packet, size_t s) { queue_element_t *e; cp - if(debug_lvl > 3) - syslog(LOG_DEBUG, _("packet to queue: %d"), s); - e = xmalloc(sizeof(*e)); e->packet = xmalloc(s); memcpy(e->packet, packet, s); @@ -215,7 +255,7 @@ cp returned a zero exit code */ void flush_queue(conn_list_t *cl, packet_queue_t **pq, - int (*function)(conn_list_t*,void*)) + int (*function)(conn_list_t*,vpn_packet_t*)) { queue_element_t *p, *next = NULL; cp @@ -229,8 +269,8 @@ cp p = next; } - if(debug_lvl > 3) - syslog(LOG_DEBUG, _("queue flushed")); + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_DEBUG, _("Queue flushed")); cp } @@ -244,17 +284,17 @@ void flush_queues(conn_list_t *cl) cp if(cl->sq) { - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Flushing send queue for " IP_ADDR_S), - IP_ADDR_V(cl->vpn_ip)); + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_DEBUG, _("Flushing send queue for %s (%s)"), + cl->name, cl->hostname); flush_queue(cl, &(cl->sq), xsend); } if(cl->rq) { - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Flushing receive queue for " IP_ADDR_S), - IP_ADDR_V(cl->vpn_ip)); + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_DEBUG, _("Flushing receive queue for %s (%s)"), + cl->name, cl->hostname); flush_queue(cl, &(cl->rq), xrecv); } cp @@ -266,43 +306,68 @@ cp int send_packet(ip_t to, vpn_packet_t *packet) { conn_list_t *cl; + subnet_t *subnet; cp - if((cl = lookup_conn(to)) == NULL) + if((subnet = lookup_subnet_ipv4(to)) == NULL) { - if(debug_lvl > 2) + if(debug_lvl >= DEBUG_TRAFFIC) { - syslog(LOG_NOTICE, _("trying to look up " IP_ADDR_S " in connection list failed."), + syslog(LOG_NOTICE, _("Trying to look up %d.%d.%d.%d in connection list failed!"), IP_ADDR_V(to)); } - for(cl = conn_list; cl != NULL && !cl->status.outgoing; cl = cl->next); - if(!cl) - { /* No open outgoing connection has been found. */ - if(debug_lvl > 2) - syslog(LOG_NOTICE, _("There is no remote host I can send this packet to.")); - return -1; + + 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(my_key_expiry <= time(NULL)) - regenerate_keys(); + /* If we ourselves have indirectdata flag set, we should send only to our uplink! */ + + /* FIXME - check for indirection and reprogram it The Right Way(tm) this time. */ + + /* Connections are now opened beforehand... if(!cl->status.dataopen) if(setup_vpn_connection(cl) < 0) - return -1; - + { + syslog(LOG_ERR, _("Could not open UDP connection to %s (%s)"), + cl->name, cl->hostname); + return -1; + } + */ + if(!cl->status.validkey) { +/* FIXME: Don't queue until everything else is fixed. + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"), + cl->name, cl->hostname); add_queue(&(cl->sq), packet, packet->len + 2); +*/ if(!cl->status.waitingforkey) - send_key_request(cl->vpn_ip); /* Keys should be sent to the host running the tincd */ + send_req_key(myself, cl); /* Keys should be sent to the host running the tincd */ return 0; } if(!cl->status.active) { +/* FIXME: Don't queue until everything else is fixed. + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_INFO, _("%s (%s) is not ready, queueing packet"), + cl->name, cl->hostname); add_queue(&(cl->sq), packet, packet->len + 2); - if(debug_lvl > 1) - syslog(LOG_INFO, _(IP_ADDR_S " is not ready, queueing packet."), IP_ADDR_V(cl->vpn_ip)); +*/ return 0; /* We don't want to mess up, do we? */ } @@ -319,19 +384,50 @@ int setup_tap_fd(void) int nfd; const char *tapfname; config_t const *cfg; + cp - if((cfg = get_config_val(tapdevice)) == NULL) - tapfname = "/dev/tap0"; - else + if((cfg = get_config_val(config, config_tapdevice))) tapfname = cfg->data.ptr; - + else +#ifdef HAVE_TUNTAP + tapfname = "/dev/misc/net/tun"; +#else + tapfname = "/dev/tap0"; +#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; + + /* Set default MAC address for ethertap devices */ + + taptype = TAP_TYPE_ETHERTAP; + 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_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 cp return 0; } @@ -345,6 +441,7 @@ int setup_listen_meta_socket(int port) int nfd, flags; struct sockaddr_in a; const int one = 1; + config_t const *cfg; cp if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) { @@ -354,31 +451,60 @@ cp if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) { - syslog(LOG_ERR, _("setsockopt: %m")); + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "setsockopt"); + return -1; + } + + if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one))) + { + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "setsockopt"); return -1; } flags = fcntl(nfd, F_GETFL); if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) { - syslog(LOG_ERR, _("fcntl: %m")); + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "fcntl"); return -1; } + if((cfg = get_config_val(config, config_interface))) + { + if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, 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); - a.sin_addr.s_addr = htonl(INADDR_ANY); + + 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)) { - syslog(LOG_ERR, _("listen: %m")); + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "listen"); return -1; } cp @@ -397,20 +523,25 @@ int setup_vpn_in_socket(int port) cp if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { + close(nfd); syslog(LOG_ERR, _("Creating socket failed: %m")); return -1; } if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) { - syslog(LOG_ERR, _("setsockopt: %m")); + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "setsockopt"); return -1; } flags = fcntl(nfd, F_GETFL); if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) { - syslog(LOG_ERR, _("fcntl: %m")); + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "fcntl"); return -1; } @@ -421,6 +552,7 @@ cp 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; } @@ -437,7 +569,10 @@ int setup_outgoing_meta_socket(conn_list_t *cl) struct sockaddr_in a; config_t const *cfg; cp - if((cfg = get_config_val(upstreamport)) == NULL) + 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; @@ -445,30 +580,36 @@ cp cl->meta_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if(cl->meta_socket == -1) { - syslog(LOG_ERR, _("Creating socket failed: %m")); + syslog(LOG_ERR, _("Creating socket for %s port %d failed: %m"), + cl->hostname, cl->port); return -1; } a.sin_family = AF_INET; a.sin_port = htons(cl->port); - a.sin_addr.s_addr = htonl(cl->real_ip); + a.sin_addr.s_addr = htonl(cl->address); if(connect(cl->meta_socket, (struct sockaddr *)&a, sizeof(a)) == -1) { - syslog(LOG_ERR, _(IP_ADDR_S ":%d: %m"), IP_ADDR_V(cl->real_ip), cl->port); + 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) { - syslog(LOG_ERR, _("fcntl: %m")); + close(cl->meta_socket); + syslog(LOG_ERR, _("fcntl for %s port %d: %m"), + cl->hostname, cl->port); return -1; } - cl->hostname = hostlookup(htonl(cl->real_ip)); + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_INFO, _("Connected to %s port %hd"), + cl->hostname, cl->port); - syslog(LOG_INFO, _("Connected to %s:%hd"), cl->hostname, cl->port); + cl->status.meta = 1; cp return 0; } @@ -480,67 +621,190 @@ cp an authentication sequence during which we will do just that. */ -int setup_outgoing_connection(ip_t ip) +int setup_outgoing_connection(char *name) { conn_list_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_conn_list(); - ncn->real_ip = ip; + asprintf(&ncn->name, "%s", name); + + if(read_host_config(ncn)) + { + syslog(LOG_ERR, _("Error reading host configuration file for %s")); + free_conn_list(ncn); + return -1; + } + + if(!(cfg = get_config_val(ncn->config, config_address))) + { + syslog(LOG_ERR, _("No address specified for %s")); + free_conn_list(ncn); + return -1; + } + + if(!(h = gethostbyname(cfg->data.ptr))) + { + syslog(LOG_ERR, _("Error looking up `%s': %m"), cfg->data.ptr); + free_conn_list(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.")); - free_conn_element(ncn); + syslog(LOG_ERR, _("Could not set up a meta connection to %s"), + ncn->hostname); + free_conn_list(ncn); return -1; } - ncn->status.meta = 1; ncn->status.outgoing = 1; - ncn->next = conn_list; - conn_list = ncn; + ncn->buffer = xmalloc(MAXBUFSIZE); + ncn->buflen = 0; + ncn->last_ping_time = time(NULL); + + conn_list_add(ncn); + + send_id(ncn); cp return 0; } /* - set up the local sockets (listen only) + Configure conn_list_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_conn_list(); - if(!(cfg = get_config_val(myvpnip))) + asprintf(&myself->hostname, "MYSELF"); /* FIXME? Do hostlookup on ourselves? */ + myself->flags = 0; + myself->protocol_version = PROT_CURRENT; + + if(!(cfg = get_config_val(config, config_name))) /* Not acceptable */ { - syslog(LOG_ERR, _("No value for my VPN IP given")); + syslog(LOG_ERR, _("Name for tinc daemon required!")); return -1; } + else + asprintf(&myself->name, "%s", (char*)cfg->data.val); - myself->vpn_ip = cfg->data.ip->ip; - myself->vpn_mask = cfg->data.ip->mask; + if(check_id(myself->name)) + { + syslog(LOG_ERR, _("Invalid name for myself!")); + return -1; + } +cp + if(!(cfg = get_config_val(config, config_privatekey))) + { + syslog(LOG_ERR, _("Private key for tinc daemon required!")); + return -1; + } + else + { + myself->rsa_key = RSA_new(); + BN_hex2bn(&myself->rsa_key->d, cfg->data.ptr); + BN_hex2bn(&myself->rsa_key->e, "FFFF"); + } - if(!(cfg = get_config_val(listenport))) + if(read_host_config(myself)) + { + syslog(LOG_ERR, _("Cannot open host configuration file for myself!")); + return -1; + } +cp + if(!(cfg = get_config_val(myself->config, config_publickey))) + { + syslog(LOG_ERR, _("Public key for tinc daemon required!")); + return -1; + } + else + { + BN_hex2bn(&myself->rsa_key->n, cfg->data.ptr); + } +/* + 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((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0) + 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) { - syslog(LOG_ERR, _("Unable to set up a listening socket")); - return -1; + 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->socket = setup_vpn_in_socket(myself->port)) < 0) + + if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0) { - syslog(LOG_ERR, _("Unable to set up an incoming vpn data socket")); - close(myself->meta_socket); + syslog(LOG_ERR, _("Unable to set up a listening socket!")); return -1; } + /* Generate packet encryption key */ + + myself->cipher_pkttype = EVP_bf_cfb(); + + 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; + + /* Activate ourselves */ + myself->status.active = 1; - syslog(LOG_NOTICE, _("Ready: listening on port %d."), myself->port); + syslog(LOG_NOTICE, _("Ready: listening on port %hd"), myself->port); + + child_pids = list_new(); cp return 0; } @@ -550,22 +814,31 @@ sigalrm_handler(int a) { config_t const *cfg; cp - cfg = get_config_val(upstreamip); + cfg = get_config_val(upstreamcfg, config_connectto); - if(!setup_outgoing_connection(cfg->data.ip->ip)) - { - signal(SIGALRM, SIG_IGN); - } - else + if(!cfg && upstreamcfg == config) + /* No upstream IP given, we're listen only. */ + return; + + while(cfg) { - signal(SIGALRM, sigalrm_handler); - seconds_till_retry += 5; - if(seconds_till_retry>300) /* Don't wait more than 5 minutes. */ - seconds_till_retry = 300; - alarm(seconds_till_retry); - syslog(LOG_ERR, _("Still failed to connect to other. Will retry in %d seconds."), - seconds_till_retry); + 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 } @@ -576,10 +849,16 @@ int setup_network_connections(void) { config_t const *cfg; cp - if((cfg = get_config_val(pingtimeout)) == NULL) - timeout = 5; + if((cfg = get_config_val(config, config_pingtimeout)) == NULL) + timeout = 60; else - timeout = cfg->data.val; + { + timeout = cfg->data.val; + if(timeout < 1) + { + timeout = 86400; + } + } if(setup_tap_fd() < 0) return -1; @@ -587,17 +866,26 @@ cp if(setup_myself() < 0) return -1; - if((cfg = get_config_val(upstreamip)) == NULL) + /* Run tinc-up script to further initialize the tap interface */ + execute_script("tinc-up"); + + if(!(cfg = get_config_val(config, config_connectto))) /* No upstream IP given, we're listen only. */ return 0; - if(setup_outgoing_connection(cfg->data.ip->ip)) + while(cfg) { - signal(SIGALRM, sigalrm_handler); - seconds_till_retry = 300; - alarm(seconds_till_retry); - syslog(LOG_NOTICE, _("Try to re-establish outgoing connection in 5 minutes.")); + 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 */ } + + 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); cp return 0; } @@ -611,30 +899,26 @@ void close_network_connections(void) cp for(p = conn_list; p != NULL; p = p->next) { - if(p->status.dataopen) - { - shutdown(p->socket, 0); /* No more receptions */ - close(p->socket); - } - if(p->status.meta) - { - send_termreq(p); - shutdown(p->meta_socket, 0); /* No more receptions */ - close(p->meta_socket); - } + p->status.active = 0; + terminate_connection(p); } if(myself) if(myself->status.active) { close(myself->meta_socket); - close(myself->socket); + free_conn_list(myself); + myself = NULL; } close(tap_fd); + + /* Execute tinc-down script right after shutting down the interface */ + execute_script("tinc-down"); + destroy_conn_list(); - syslog(LOG_NOTICE, _("Terminating.")); + syslog(LOG_NOTICE, _("Terminating")); cp return; } @@ -646,32 +930,65 @@ int setup_vpn_connection(conn_list_t *cl) { int nfd, flags; struct sockaddr_in a; + const int one = 1; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Opening UDP socket to " IP_ADDR_S), IP_ADDR_V(cl->real_ip)); + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_DEBUG, _("Opening UDP socket to %s"), cl->hostname); nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if(nfd == -1) { - syslog(LOG_ERR, _("Creating data socket failed: %m")); + syslog(LOG_ERR, _("Creating UDP socket failed: %m")); + return -1; + } + + if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) + { + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "setsockopt"); + 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; + } + + memset(&a, 0, sizeof(a)); + a.sin_family = AF_INET; + a.sin_port = htons(myself->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"), myself->port); return -1; } a.sin_family = AF_INET; a.sin_port = htons(cl->port); - a.sin_addr.s_addr = htonl(cl->real_ip); + a.sin_addr.s_addr = htonl(cl->address); if(connect(nfd, (struct sockaddr *)&a, sizeof(a)) == -1) { - syslog(LOG_ERR, _("Connecting to " IP_ADDR_S ":%d failed: %m"), - IP_ADDR_V(cl->real_ip), cl->port); + close(nfd); + syslog(LOG_ERR, _("Connecting to %s port %d failed: %m"), + cl->hostname, cl->port); return -1; } flags = fcntl(nfd, F_GETFL); if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) { - syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"), __FILE__, __LINE__, nfd); + close(nfd); + syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m %s (%s)"), __FILE__, __LINE__, nfd, + cl->name, cl->hostname); return -1; } @@ -693,27 +1010,27 @@ conn_list_t *create_new_connection(int sfd) cp p = new_conn_list(); - if(getpeername(sfd, &ci, &len) < 0) + if(getpeername(sfd, (struct sockaddr *) &ci, (socklen_t *) &len) < 0) { - syslog(LOG_ERR, _("Error: getpeername: %m")); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "getpeername"); return NULL; } + p->name = unknown; + p->address = ntohl(ci.sin_addr.s_addr); p->hostname = hostlookup(ci.sin_addr.s_addr); - p->real_ip = ntohl(ci.sin_addr.s_addr); p->meta_socket = sfd; p->status.meta = 1; + p->buffer = xmalloc(MAXBUFSIZE); p->buflen = 0; p->last_ping_time = time(NULL); - p->want_ping = 0; - syslog(LOG_NOTICE, _("Connection from %s:%d"), p->hostname, htons(ci.sin_port)); + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Connection from %s port %d"), + p->hostname, htons(ci.sin_port)); - if(send_basic_info(p) < 0) - { - free(p); - return NULL; - } + p->allow_request = ID; cp return p; } @@ -736,7 +1053,6 @@ cp } FD_SET(myself->meta_socket, fs); - FD_SET(myself->socket, fs); FD_SET(tap_fd, fs); cp } @@ -748,62 +1064,36 @@ cp */ int handle_incoming_vpn_data(conn_list_t *cl) { - real_packet_t rp; - int lenin; + vpn_packet_t pkt; int x, l = sizeof(x); - conn_list_t *f; + int lenin; cp if(getsockopt(cl->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) { - syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"), __FILE__, __LINE__, cl->socket); + syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"), + __FILE__, __LINE__, cl->socket); return -1; } if(x) { - syslog(LOG_ERR, _("Incoming data socket error: %s"), sys_errlist[x]); + syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x)); return -1; } - rp.len = -1; - lenin = recvfrom(cl->socket, &rp, MTU, 0, NULL, NULL); - if(lenin <= 0) + if((lenin = recv(cl->socket, (char *) &(pkt.len), MTU, 0)) <= 0) { - syslog(LOG_ERR, _("Receiving data failed: %m")); + syslog(LOG_ERR, _("Receiving packet failed: %m")); return -1; } - total_socket_in += lenin; - rp.data.len = ntohs(rp.data.len); - rp.len = ntohs(rp.len); - rp.from = ntohl(rp.from); - - if(rp.len >= 0) + if(debug_lvl >= DEBUG_TRAFFIC) { - f = lookup_conn(rp.from); - if(debug_lvl > 3) - syslog(LOG_DEBUG, _("packet from " IP_ADDR_S " (len %d)"), - IP_ADDR_V(rp.from), rp.len); - if(!f) - { - syslog(LOG_ERR, _("Got packet from unknown source " IP_ADDR_S), - IP_ADDR_V(rp.from)); - return -1; - } - - if(f->status.validkey) - xrecv(f, &rp); - else - { - add_queue(&(f->rq), &rp, rp.len); - if(!cl->status.waitingforkey) - send_key_request(rp.from); - } - - if(my_key_expiry <= time(NULL)) - regenerate_keys(); + syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), lenin, + cl->name, cl->hostname); } + cp - return 0; + return xrecv(cl, &pkt); } /* @@ -812,32 +1102,57 @@ cp */ void terminate_connection(conn_list_t *cl) { + conn_list_t *p; + subnet_t *s; cp if(cl->status.remove) return; - if(debug_lvl > 0) - syslog(LOG_NOTICE, _("Closing connection with %s."), cl->hostname); - - if(cl->status.timeout) - send_timeout(cl); - else if(!cl->status.termreq) - send_termreq(cl); + cl->status.remove = 1; - close(cl->socket); + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Closing connection with %s (%s)"), + cl->name, cl->hostname); + + if(cl->socket) + close(cl->socket); if(cl->status.meta) close(cl->meta_socket); - if(cl->status.outgoing) +cp + /* Find all connections that were lost because they were behind cl + (the connection that was dropped). */ + + if(cl->status.meta) + for(p = conn_list; p != NULL; p = p->next) + if((p->nexthop == cl) && (p != cl)) + terminate_connection(p); /* Sounds like recursion, but p does not have a meta connection :) */ + + /* Inform others of termination if it was still active */ + + if(cl->status.active) + for(p = conn_list; p != NULL; p = p->next) + if(p->status.meta && p->status.active && p!=cl) + send_del_host(p, cl); + + /* Remove the associated subnets */ + + for(s = cl->subnets; s; s = s->next) + subnet_del(s); + + /* Check if this was our outgoing connection */ + + if(cl->status.outgoing && cl->status.active) { signal(SIGALRM, sigalrm_handler); seconds_till_retry = 5; alarm(seconds_till_retry); - syslog(LOG_NOTICE, _("Try to re-establish outgoing connection in 5 seconds.")); + syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 seconds")); } - + + /* Inactivate */ + cl->status.active = 0; - cl->status.remove = 1; cp } @@ -857,25 +1172,21 @@ cp now = time(NULL); for(p = conn_list; p != NULL; p = p->next) { - if(p->status.remove) - continue; if(p->status.active && p->status.meta) { if(p->last_ping_time + timeout < now) { - if(p->status.pinged && !p->status.got_pong) + if(p->status.pinged) { - syslog(LOG_INFO, _("%s (" IP_ADDR_S ") didn't respond to ping"), - p->hostname, IP_ADDR_V(p->vpn_ip)); + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_INFO, _("%s (%s) didn't respond to PING"), + p->name, p->hostname); p->status.timeout = 1; terminate_connection(p); } - else if(p->want_ping) + else { send_ping(p); - p->last_ping_time = now; - p->status.pinged = 1; - p->status.got_pong = 0; } } } @@ -888,125 +1199,31 @@ cp accept a new tcp connect and create a new connection */ -int handle_new_meta_connection(conn_list_t *cl) +int handle_new_meta_connection() { conn_list_t *ncn; struct sockaddr client; int nfd, len = sizeof(client); cp - if((nfd = accept(cl->meta_socket, &client, &len)) < 0) + 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)) == NULL) + if(!(ncn = create_new_connection(nfd))) { shutdown(nfd, 2); close(nfd); - syslog(LOG_NOTICE, _("Closed attempted connection.")); + syslog(LOG_NOTICE, _("Closed attempted connection")); return 0; } - ncn->status.meta = 1; - ncn->next = conn_list; - conn_list = ncn; + conn_list_add(ncn); cp return 0; } -/* - dispatch any incoming meta requests -*/ -int handle_incoming_meta_data(conn_list_t *cl) -{ - int x, l = sizeof(x); - int request, oldlen, i; - int lenin = 0; -cp - if(getsockopt(cl->meta_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) - { - syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"), __FILE__, __LINE__, cl->meta_socket); - return -1; - } - if(x) - { - syslog(LOG_ERR, _("Metadata socket error: %s"), sys_errlist[x]); - return -1; - } - - if(cl->buflen >= MAXBUFSIZE) - { - syslog(LOG_ERR, _("Metadata read buffer overflow.")); - return -1; - } - - lenin = read(cl->meta_socket, cl->buffer, MAXBUFSIZE-cl->buflen); - - if(lenin<=0) - { - syslog(LOG_ERR, _("Metadata socket read error: %m")); - return -1; - } - - oldlen = cl->buflen; - cl->buflen += lenin; - - for(;;) - { - cl->reqlen = 0; - - for(i = oldlen; i < cl->buflen; i++) - { - if(cl->buffer[i] == '\n') - { - cl->buffer[i] = 0; /* replace end-of-line by end-of-string so we can use sscanf */ - cl->reqlen = i + 1; - break; - } - } - - if(cl->reqlen) - { - if(sscanf(cl->buffer, "%d", &request) == 1) - { - if(request_handlers[request] == NULL) - { - syslog(LOG_ERR, _("Unknown request: %s"), cl->buffer); - return -1; - } - - if(debug_lvl > 3) - syslog(LOG_DEBUG, _("Got request: %s"), cl->buffer); - - if(request_handlers[request](cl)) /* Something went wrong. Probably scriptkiddies. Terminate. */ - { - syslog(LOG_ERR, _("Error while processing request from " IP_ADDR_S), IP_ADDR_V(cl->real_ip)); - return -1; - } - } - else - { - syslog(LOG_ERR, _("Bogus data received.")); - return -1; - } - - cl->buflen -= cl->reqlen; - memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen); - oldlen = 0; - } - else - { - break; - } - } - - cl->last_ping_time = time(NULL); - cl->want_ping = 0; -cp - return 0; -} - /* check all connections to see if anything happened on their sockets @@ -1014,7 +1231,6 @@ cp void check_network_activity(fd_set *f) { conn_list_t *p; - int x, l = sizeof(x); cp for(p = conn_list; p != NULL; p = p->next) { @@ -1024,32 +1240,29 @@ cp if(p->status.dataopen) if(FD_ISSET(p->socket, f)) { - /* - The only thing that can happen to get us here is apparently an - error on this outgoing(!) UDP socket that isn't immediate (i.e. - something that will not trigger an error directly on send()). - I've once got here when it said `No route to host'. - */ + handle_incoming_vpn_data(p); + + /* Old error stuff (FIXME: copy this to handle_incoming_vpn_data() + getsockopt(p->socket, SOL_SOCKET, SO_ERROR, &x, &l); - syslog(LOG_ERR, _("Outgoing data socket error: %s"), sys_errlist[x]); + syslog(LOG_ERR, _("Outgoing data socket error for %s (%s): %s"), + p->name, p->hostname, strerror(x)); terminate_connection(p); + */ return; } if(p->status.meta) if(FD_ISSET(p->meta_socket, f)) - if(handle_incoming_meta_data(p) < 0) + if(receive_meta(p) < 0) { terminate_connection(p); return; } } - if(FD_ISSET(myself->socket, f)) - handle_incoming_vpn_data(myself); - if(FD_ISSET(myself->meta_socket, f)) - handle_new_meta_connection(myself); + handle_new_meta_connection(); cp } @@ -1060,49 +1273,42 @@ cp void handle_tap_input(void) { vpn_packet_t vp; - ip_t from, to; - int ether_type, lenin; + int lenin; cp - memset(&vp, 0, sizeof(vp)); - if((lenin = read(tap_fd, &vp, MTU)) <= 0) + if(taptype == TAP_TYPE_TUNTAP) { - syslog(LOG_ERR, _("Error while reading from tapdevice: %m")); - return; + 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; - ether_type = ntohs(*((unsigned short*)(&vp.data[12]))); - if(ether_type != 0x0800) - { - if(debug_lvl > 0) - syslog(LOG_INFO, _("Non-IP ethernet frame %04x from " MAC_ADDR_S), - ether_type, MAC_ADDR_V(vp.data[6])); - return; - } - if(lenin < 32) { - if(debug_lvl > 0) - syslog(LOG_INFO, _("Dropping short packet")); + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_WARNING, _("Received short packet from tap device")); return; } - from = ntohl(*((unsigned long*)(&vp.data[26]))); - to = ntohl(*((unsigned long*)(&vp.data[30]))); - - if(debug_lvl > 3) - syslog(LOG_DEBUG, _("An IP packet (%04x) for " IP_ADDR_S " from " IP_ADDR_S), - ether_type, IP_ADDR_V(to), IP_ADDR_V(from)); - if(debug_lvl > 4) - syslog(LOG_DEBUG, _(MAC_ADDR_S " to " MAC_ADDR_S), - MAC_ADDR_V(vp.data[0]), MAC_ADDR_V(vp.data[6])); - - vp.len = (length_t)lenin - 2; - - strip_mac_addresses(&vp); + if(debug_lvl >= DEBUG_TRAFFIC) + { + syslog(LOG_DEBUG, _("Read packet of length %d from tap device"), vp.len); + } - send_packet(to, &vp); + send_packet(ntohl(*((unsigned long*)(&vp.data[30]))), &vp); cp } @@ -1115,6 +1321,7 @@ void main_loop(void) struct timeval tv; int r; time_t last_ping_check; + int t; cp last_ping_check = time(NULL); @@ -1128,25 +1335,66 @@ cp if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0) { - if(errno == EINTR) /* because of alarm */ - continue; - syslog(LOG_ERR, _("Error while waiting for input: %m")); - return; + if(errno != EINTR) /* because of alarm */ + { + syslog(LOG_ERR, _("Error while waiting for input: %m")); + return; + } } - if(last_ping_check + timeout < time(NULL)) - /* Let's check if everybody is still alive */ + 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(0); + } + + 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); - continue; + + /* 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; + } } - check_network_activity(&fset); + if(r > 0) + { + check_network_activity(&fset); + + /* local tap data */ + if(FD_ISSET(tap_fd, &fset)) + handle_tap_input(); + } - /* local tap data */ - if(FD_ISSET(tap_fd, &fset)) - handle_tap_input(); + check_children(); } cp }