X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet.c;h=39f01fa7190122354f44feb0f8bc60539380f416;hp=16ab326c73009a8b052e3da8f46a0181289aa665;hb=462ab530e546f5732dfd51134751da6f6910d679;hpb=e64ef59df44d39c76c00dee22841bbcce7c24e47 diff --git a/src/net.c b/src/net.c index 16ab326c..39f01fa7 100644 --- a/src/net.c +++ b/src/net.c @@ -1,7 +1,7 @@ /* net.c -- most of the network code - Copyright (C) 1998,1999,2000 Ivo Timmermans , - 2000 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 @@ -17,966 +17,211 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: net.c,v 1.36 2000/10/18 20:12:08 zarq Exp $ + $Id: net.c,v 1.37 2002/04/09 15:26:00 zarq Exp $ */ #include "config.h" -#include #include #include #include #include +#ifdef HAVE_LINUX + #include + #include +#endif #include #include #include -#include -#include +#include #include #include #include #include - -#ifdef HAVE_TUNTAP +#include +/* SunOS really wants sys/socket.h BEFORE net/if.h, + and FreeBSD wants these lines below the rest. */ +#include +#include #include -#include LINUX_IF_TUN_H -#endif + +#include #include #include +#include +#include #include "conf.h" -#include "encr.h" +#include "connection.h" +#include "meta.h" #include "net.h" #include "netutl.h" +#include "process.h" #include "protocol.h" -#include "meta.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 = 0; -int total_tap_in = 0; -int total_tap_out = 0; -int total_socket_in = 0; -int total_socket_out = 0; - -int upstreamindex = 0; -static int seconds_till_retry; - -char *unknown = NULL; - -/* - strip off the MAC adresses of an ethernet frame -*/ -void strip_mac_addresses(vpn_packet_t *p) -{ -cp - memmove(p->data, p->data + 12, p->len -= 12); -cp -} - -/* - reassemble MAC addresses -*/ -void add_mac_addresses(vpn_packet_t *p) -{ -cp - memcpy(p->data + 12, p->data, p->len); - p->len += 12; - p->data[0] = p->data[6] = 0xfe; - p->data[1] = p->data[7] = 0xfd; - /* Really evil pointer stuff just below! */ - *((ip_t*)(&p->data[2])) = (ip_t)(htonl(myself->address)); - *((ip_t*)(&p->data[8])) = *((ip_t*)(&p->data[26])); -cp -} - -int xsend(conn_list_t *cl, vpn_packet_t *inpkt) -{ - vpn_packet_t outpkt; - int outlen, outpad; -cp - outpkt.len = inpkt->len; - EVP_EncryptInit(cl->cipher_pktctx, cl->cipher_pkttype, cl->cipher_pktkey, NULL); - EVP_EncryptUpdate(cl->cipher_pktctx, outpkt.data, &outlen, inpkt->data, inpkt->len); - EVP_EncryptFinal(cl->cipher_pktctx, outpkt.data + outlen, &outpad); - outlen += outpad; - - if(debug_lvl > 3) - syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), - outlen, cl->name, cl->hostname); +int do_purge = 0; +int sighup = 0; +int sigalrm = 0; - total_socket_out += outlen; +time_t now = 0; - cl->want_ping = 1; +/* Purge edges and subnets of unreachable nodes. Use carefully. */ - if((send(cl->socket, (char *) &(outpkt.len), outlen + 2, 0)) < 0) - { - syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"), - cl->name, cl->hostname); - return -1; - } -cp - return 0; -} - -int xrecv(vpn_packet_t *inpkt) +void purge(void) { - vpn_packet_t outpkt; - int outlen, outpad; -cp - if(debug_lvl > 3) - syslog(LOG_ERR, _("Receiving packet of %d bytes"), - inpkt->len); - - outpkt.len = inpkt->len; - EVP_DecryptInit(myself->cipher_pktctx, myself->cipher_pkttype, myself->cipher_pktkey, NULL); - EVP_DecryptUpdate(myself->cipher_pktctx, outpkt.data, &outlen, inpkt->data, inpkt->len); - /* FIXME: grok DecryptFinal - EVP_DecryptFinal(myself->cipher_pktctx, outpkt.data + outlen, &outpad); - */ - - add_mac_addresses(&outpkt); - - if(write(tap_fd, outpkt.data, outpkt.len) < 0) - syslog(LOG_ERR, _("Can't write to tap device: %m")); - else - total_tap_out += outpkt.len; + avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext, *cnode; + node_t *n; + edge_t *e; + subnet_t *s; + connection_t *c; cp - return 0; -} + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_DEBUG, _("Purging unreachable nodes")); -/* - add the given packet of size s to the - queue q, be it the send or receive queue -*/ -void add_queue(packet_queue_t **q, void *packet, size_t s) -{ - queue_element_t *e; -cp - e = xmalloc(sizeof(*e)); - e->packet = xmalloc(s); - memcpy(e->packet, packet, s); - - if(!*q) - { - *q = xmalloc(sizeof(**q)); - (*q)->head = (*q)->tail = NULL; - } - - e->next = NULL; /* We insert at the tail */ + for(nnode = node_tree->head; nnode; nnode = nnext) + { + nnext = nnode->next; + n = (node_t *)nnode->data; - if((*q)->tail) /* Do we have a tail? */ + if(!n->status.reachable) { - (*q)->tail->next = e; - e->prev = (*q)->tail; - } - else /* No tail -> no head too */ - { - (*q)->head = e; - e->prev = NULL; - } - - (*q)->tail = e; -cp -} + if(debug_lvl >= DEBUG_SCARY_THINGS) + syslog(LOG_DEBUG, _("Purging node %s (%s)"), n->name, n->hostname); -/* Remove a queue element */ -void del_queue(packet_queue_t **q, queue_element_t *e) -{ -cp - free(e->packet); + for(snode = n->subnet_tree->head; snode; snode = snext) + { + snext = snode->next; + s = (subnet_t *)snode->data; - if(e->next) /* There is a successor, so we are not tail */ - { - if(e->prev) /* There is a predecessor, so we are not head */ + for(cnode = connection_tree->head; cnode; cnode = cnode->next) { - e->next->prev = e->prev; - e->prev->next = e->next; + c = (connection_t *)cnode->data; + if(c->status.active) + send_del_subnet(c, s); } - else /* We are head */ - { - e->next->prev = NULL; - (*q)->head = e->next; - } - } - else /* We are tail (or all alone!) */ - { - if(e->prev) /* We are not alone :) */ - { - e->prev->next = NULL; - (*q)->tail = e->prev; - } - else /* Adieu */ - { - free(*q); - *q = NULL; - } - } - - free(e); -cp -} - -/* - flush a queue by calling function for - each packet, and removing it when that - returned a zero exit code -*/ -void flush_queue(conn_list_t *cl, packet_queue_t **pq, - int (*function)(conn_list_t*,void*)) -{ - queue_element_t *p, *next = NULL; -cp - for(p = (*pq)->head; p != NULL; ) - { - next = p->next; - - if(!function(cl, p->packet)) - del_queue(pq, p); - - p = next; - } - - if(debug_lvl > 3) - syslog(LOG_DEBUG, _("Queue flushed")); -cp -} -/* - flush the send&recv queues - void because nothing goes wrong here, packets - remain in the queue if something goes wrong -*/ -void flush_queues(conn_list_t *cl) -{ -cp - if(cl->sq) - { - if(debug_lvl > 3) - syslog(LOG_DEBUG, _("Flushing send queue for %s (%s)"), - cl->name, cl->hostname); - flush_queue(cl, &(cl->sq), xsend); - } + subnet_del(n, s); + } - if(cl->rq) - { - if(debug_lvl > 3) - syslog(LOG_DEBUG, _("Flushing receive queue for %s (%s)"), - cl->name, cl->hostname); - flush_queue(cl, &(cl->rq), xrecv); - } -cp -} + for(enode = n->edge_tree->head; enode; enode = enext) + { + enext = enode->next; + e = (edge_t *)enode->data; -/* - send a packet to the given vpn ip. -*/ -int send_packet(ip_t to, vpn_packet_t *packet) -{ - conn_list_t *cl; -cp - if((cl = lookup_conn_list_ipv4(to)) == NULL) - { - if(debug_lvl > 3) + for(cnode = connection_tree->head; cnode; cnode = cnode->next) { - syslog(LOG_NOTICE, _("Trying to look up %d.%d.%d.%d in connection list failed!"), - IP_ADDR_V(to)); + c = (connection_t *)cnode->data; + if(c->status.active) + send_del_edge(c, e); } - return -1; - } - - /* 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. */ - - if(!cl->status.dataopen) - if(setup_vpn_connection(cl) < 0) - { - syslog(LOG_ERR, _("Could not open UDP connection to %s (%s)"), - cl->name, cl->hostname); - return -1; + edge_del(e); } - - if(!cl->status.validkey) - { - if(debug_lvl > 3) - 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_req_key(myself, cl); /* Keys should be sent to the host running the tincd */ - return 0; - } - - if(!cl->status.active) - { - if(debug_lvl > 3) - syslog(LOG_INFO, _("%s (%s) is not ready, queueing packet"), - cl->name, cl->hostname); - add_queue(&(cl->sq), packet, packet->len + 2); - return 0; /* We don't want to mess up, do we? */ - } - - /* can we send it? can we? can we? huh? */ -cp - return xsend(cl, packet); -} -/* - open the local ethertap device -*/ -int setup_tap_fd(void) -{ - int nfd; - const char *tapfname; - config_t const *cfg; - -#ifdef HAVE_TUNTAP - struct ifreq ifr; -#endif -cp - if((cfg = get_config_val(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; + node_del(n); } -cp - tap_fd = nfd; - - taptype = 0; - -#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 = 1; - if((cfg = get_config_val(config, tapsubnet)) == NULL) - syslog(LOG_INFO, _("tun/tap device will be left unconfigured")); - else - /* Setup inetaddr/netmask etc */; } -#endif - -cp - return 0; -} - -/* - set up the socket that we listen on for incoming - (tcp) connections -*/ -int setup_listen_meta_socket(int port) -{ - int nfd, flags; - struct sockaddr_in a; - const int one = 1; - config_t const *cfg; -cp - if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) - { - syslog(LOG_ERR, _("Creating metasocket failed: %m")); - return -1; - } - - if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) - { - syslog(LOG_ERR, _("setsockopt: %m")); - return -1; - } - - if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one))) - { - syslog(LOG_ERR, _("setsockopt: %m")); - return -1; - } - - flags = fcntl(nfd, F_GETFL); - if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) - { - syslog(LOG_ERR, _("fcntl: %m")); - return -1; - } - - if((cfg = get_config_val(config, interface))) - { - if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, cfg->data.ptr, strlen(cfg->data.ptr))) - { - 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, interfaceip))) - a.sin_addr.s_addr = htonl(cfg->data.ip->ip); - else - a.sin_addr.s_addr = htonl(INADDR_ANY); - - if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr))) - { - syslog(LOG_ERR, _("Can't bind to port %hd/tcp: %m"), port); - return -1; - } - - if(listen(nfd, 3)) - { - syslog(LOG_ERR, _("listen: %m")); - return -1; - } -cp - return nfd; -} - -/* - setup the socket for incoming encrypted - data (the udp part) -*/ -int setup_vpn_in_socket(int port) -{ - int nfd, flags; - struct sockaddr_in a; - const int one = 1; cp - if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) - { - syslog(LOG_ERR, _("Creating socket failed: %m")); - return -1; - } - - if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) - { - syslog(LOG_ERR, _("setsockopt: %m")); - return -1; - } - - flags = fcntl(nfd, F_GETFL); - if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) - { - syslog(LOG_ERR, _("fcntl: %m")); - 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))) - { - syslog(LOG_ERR, _("Can't bind to port %hd/udp: %m"), port); - return -1; - } -cp - return nfd; } /* - setup an outgoing meta (tcp) socket + put all file descriptors in an fd_set array + While we're at it, purge stuff that needs to be removed. */ -int setup_outgoing_meta_socket(conn_list_t *cl) +void build_fdset(fd_set *fs) { - int flags; - struct sockaddr_in a; - config_t const *cfg; + avl_node_t *node, *next; + connection_t *c; + int i; cp - if(debug_lvl > 0) - syslog(LOG_INFO, _("Trying to connect to %s"), cl->hostname); - - if((cfg = get_config_val(cl->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; - } - - 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) - { - syslog(LOG_ERR, _("%s port %hd: %m"), cl->hostname, cl->port); - return -1; - } + FD_ZERO(fs); - flags = fcntl(cl->meta_socket, F_GETFL); - if(fcntl(cl->meta_socket, F_SETFL, flags | O_NONBLOCK) < 0) + for(node = connection_tree->head; node; node = next) { - syslog(LOG_ERR, _("fcntl for %s port %d: %m"), - cl->hostname, cl->port); - return -1; - } + next = node->next; + c = (connection_t *)node->data; - if(debug_lvl > 0) - syslog(LOG_INFO, _("Connected to %s port %hd"), - cl->hostname, cl->port); - - cl->status.meta = 1; -cp - return 0; -} - -/* - setup an outgoing connection. It's not - necessary to also open an udp socket as - well, because the other host will initiate - an authentication sequence during which - we will do just that. -*/ -int setup_outgoing_connection(char *name) -{ - conn_list_t *ncn; - struct hostent *h; - config_t *cfg; -cp - if(check_id(name)) - { - syslog(LOG_ERR, _("Invalid name for outgoing connection")); - return -1; + if(c->status.remove) + connection_del(c); + else + FD_SET(c->socket, fs); } - ncn = new_conn_list(); - 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, 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; - } + if(!connection_tree->head) + purge(); - ncn->address = ntohl(*((ip_t*)(h->h_addr_list[0]))); - ncn->hostname = hostlookup(htonl(ncn->address)); - - if(setup_outgoing_meta_socket(ncn) < 0) + for(i = 0; i < listen_sockets; i++) { - syslog(LOG_ERR, _("Could not set up a meta connection to %s"), - ncn->hostname); - free_conn_list(ncn); - return -1; + FD_SET(listen_socket[i].tcp, fs); + FD_SET(listen_socket[i].udp, fs); } - ncn->status.outgoing = 1; - ncn->buffer = xmalloc(MAXBUFSIZE); - ncn->buflen = 0; - ncn->last_ping_time = time(NULL); - ncn->want_ping = 0; - - conn_list_add(ncn); - - send_id(ncn); + FD_SET(device_fd, fs); cp - return 0; } /* - set up the local sockets (listen only) + 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_myself(void) +void terminate_connection(connection_t *c, int report) { - config_t const *cfg; + avl_node_t *node; + connection_t *other; cp - myself = new_conn_list(); - - asprintf(&myself->hostname, "MYSELF"); /* FIXME? Do hostlookup on ourselves? */ - myself->flags = 0; - myself->protocol_version = PROT_CURRENT; - - if(!(cfg = get_config_val(config, tincname))) /* 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; - } - - if(read_host_config(myself)) - { - syslog(LOG_ERR, _("Cannot open host configuration file for myself!")); - return -1; - } - - if(!(cfg = get_config_val(myself->config, port))) - myself->port = 655; - else - myself->port = cfg->data.val; - - if((cfg = get_config_val(myself->config, indirectdata))) - if(cfg->data.val == stupid_true) - myself->flags |= EXPORTINDIRECTDATA; - - if((cfg = get_config_val(myself->config, tcponly))) - if(cfg->data.val == stupid_true) - myself->flags |= TCPONLY; - - if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0) - { - syslog(LOG_ERR, _("Unable to set up a listening socket!")); - return -1; - } - - if((myself->socket = setup_vpn_in_socket(myself->port)) < 0) - { - syslog(LOG_ERR, _("Unable to set up an incoming vpn data socket!")); - close(myself->meta_socket); - return -1; - } - - 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_next_config_val(config, connectto, upstreamindex++); - - if(!upstreamindex && !cfg) - /* No upstream IP given, we're listen only. */ + if(c->status.remove) return; - while(cfg) - { - if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */ - { - signal(SIGALRM, SIG_IGN); - return; - } - cfg = get_next_config_val(config, connectto, upstreamindex++); /* Or else we try the next ConnectTo line */ - } - - signal(SIGALRM, sigalrm_handler); - upstreamindex = 0; - 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 - if((cfg = get_config_val(config, pingtimeout)) == NULL) - timeout = 5; - else - timeout = cfg->data.val; + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Closing connection with %s (%s)"), + c->name, c->hostname); - if(setup_tap_fd() < 0) - return -1; + c->status.remove = 1; + c->status.active = 0; - if(setup_myself() < 0) - return -1; + if(c->node) + c->node->connection = NULL; - if((cfg = get_next_config_val(config, connectto, upstreamindex++)) == NULL) - /* No upstream IP given, we're listen only. */ - return 0; + if(c->socket) + close(c->socket); - while(cfg) + if(c->edge) { - if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */ - return 0; - cfg = get_next_config_val(config, connectto, upstreamindex++); /* Or else we try the next ConnectTo line */ - } - - signal(SIGALRM, sigalrm_handler); - upstreamindex = 0; - 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; -} - -/* - close all open network connections -*/ -void close_network_connections(void) -{ - conn_list_t *p; -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); + if(report) + { + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_del_edge(other, c->edge); + } } - } - - if(myself) - if(myself->status.active) - { - close(myself->meta_socket); - close(myself->socket); - } - - close(tap_fd); - destroy_conn_list(); - syslog(LOG_NOTICE, _("Terminating")); -cp - return; -} - -/* - create a data (udp) socket -*/ -int setup_vpn_connection(conn_list_t *cl) -{ - int nfd, flags; - struct sockaddr_in a; -cp - if(debug_lvl > 0) - syslog(LOG_DEBUG, _("Opening UDP socket to %s"), cl->hostname); + edge_del(c->edge); - nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); - if(nfd == -1) - { - syslog(LOG_ERR, _("Creating UDP socket failed: %m")); - return -1; - } - - a.sin_family = AF_INET; - a.sin_port = htons(cl->port); - a.sin_addr.s_addr = htonl(cl->address); - - if(connect(nfd, (struct sockaddr *)&a, sizeof(a)) == -1) - { - syslog(LOG_ERR, _("Connecting to %s port %d failed: %m"), - cl->hostname, cl->port); - return -1; - } + /* Run MST and SSSP algorithms */ - 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 %s (%s)"), __FILE__, __LINE__, nfd, - cl->name, cl->hostname); - return -1; - } - - cl->socket = nfd; - cl->status.dataopen = 1; -cp - return 0; -} - -/* - handle an incoming tcp connect call and open - a connection to it. -*/ -conn_list_t *create_new_connection(int sfd) -{ - conn_list_t *p; - struct sockaddr_in ci; - int len = sizeof(ci); -cp - p = new_conn_list(); - - if(getpeername(sfd, &ci, &len) < 0) - { - syslog(LOG_ERR, _("Error: getpeername: %m")); - return NULL; + graph(); } - p->name = unknown; - p->address = ntohl(ci.sin_addr.s_addr); - p->hostname = hostlookup(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; - - if(debug_lvl > 0) - syslog(LOG_NOTICE, _("Connection from %s port %d"), - p->hostname, htons(ci.sin_port)); - - p->allow_request = ID; -cp - return p; -} + /* Check if this was our outgoing connection */ -/* - put all file descriptors in an fd_set array -*/ -void build_fdset(fd_set *fs) -{ - conn_list_t *p; -cp - FD_ZERO(fs); - - for(p = conn_list; p != NULL; p = p->next) + if(c->outgoing) { - if(p->status.meta) - FD_SET(p->meta_socket, fs); - if(p->status.dataopen) - FD_SET(p->socket, fs); - } - - FD_SET(myself->meta_socket, fs); - FD_SET(myself->socket, fs); - FD_SET(tap_fd, fs); -cp -} - -/* - receive incoming data from the listening - udp socket and write it to the ethertap - device after being decrypted -*/ -int handle_incoming_vpn_data() -{ - vpn_packet_t pkt; - int lenin; - int x, l = sizeof(x); -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(recvfrom(myself->socket, (char *) &(pkt.len), MTU, 0, NULL, NULL) <= 0) - { - syslog(LOG_ERR, _("Receiving packet failed: %m")); - return -1; - } - -cp - return xrecv(&pkt); -} - -/* - terminate a connection and notify the other - end before closing the sockets -*/ -void terminate_connection(conn_list_t *cl) -{ - conn_list_t *p; - -cp - if(cl->status.remove) - return; - - if(debug_lvl > 0) - 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); - - cl->status.remove = 1; - - /* If this cl isn't active, don't send any DEL_HOSTs. */ - -/* FIXME: reprogram this. - if(cl->status.active) - notify_others(cl,NULL,send_del_host); -*/ - -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)) - { - if(cl->status.active && p->status.active) -/* FIXME: reprogram this - notify_others(p,cl,send_del_host); -*/; - if(cl->socket) - close(cl->socket); - p->status.active = 0; - p->status.remove = 1; - } - } - - cl->status.active = 0; - - if(cl->status.outgoing) - { - signal(SIGALRM, sigalrm_handler); - seconds_till_retry = 5; - alarm(seconds_till_retry); - syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 seconds")); + retry_outgoing(c->outgoing); + c->outgoing = NULL; } cp } @@ -989,71 +234,42 @@ cp end does not reply in time, we consider them dead and close the connection. */ -int check_dead_connections(void) +void check_dead_connections(void) { - conn_list_t *p; - time_t now; + avl_node_t *node, *next; + connection_t *c; cp - now = time(NULL); - for(p = conn_list; p != NULL; p = p->next) + for(node = connection_tree->head; node; node = next) { - if(p->status.remove) - continue; - if(p->status.active && p->status.meta) - { - if(p->last_ping_time + timeout < now) + next = node->next; + c = (connection_t *)node->data; + if(c->last_ping_time + pingtimeout < now) + { + if(c->status.active) { - if(p->status.pinged && !p->status.got_pong) + if(c->status.pinged) { - if(debug_lvl > 1) - syslog(LOG_INFO, _("%s (%s) didn't respond to PING"), - p->name, p->hostname); - p->status.timeout = 1; - terminate_connection(p); + 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 if(p->want_ping) + else { - send_ping(p); - p->last_ping_time = now; - p->status.pinged = 1; - p->status.got_pong = 0; + send_ping(c); } } - } - } -cp - return 0; -} - -/* - accept a new tcp connect and create a - new connection -*/ -int handle_new_meta_connection() -{ - conn_list_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; + else + { + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_WARNING, _("Timeout from %s (%s) during authentication"), + c->name, c->hostname); + terminate_connection(c, 0); + } + } } - - ncn->status.meta = 1; - ncn->next = conn_list; - conn_list = ncn; cp - return 0; } /* @@ -1062,99 +278,57 @@ cp */ void check_network_activity(fd_set *f) { - conn_list_t *p; - int x, l = sizeof(x); + connection_t *c; + avl_node_t *node; + int result, i; + int len = sizeof(result); + vpn_packet_t packet; cp - for(p = conn_list; p != NULL; p = p->next) + if(FD_ISSET(device_fd, f)) { - if(p->status.remove) - continue; - - 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'. - */ - getsockopt(p->socket, SOL_SOCKET, SO_ERROR, &x, &l); - 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(receive_meta(p) < 0) - { - terminate_connection(p); - return; - } + if(!read_packet(&packet)) + route_outgoing(&packet); } - - if(FD_ISSET(myself->socket, f)) - handle_incoming_vpn_data(); - if(FD_ISSET(myself->meta_socket, f)) - handle_new_meta_connection(); -cp -} + for(node = connection_tree->head; node; node = node->next) + { + c = (connection_t *)node->data; -/* - read, encrypt and send data that is - available through the ethertap device -*/ -void handle_tap_input(void) -{ - vpn_packet_t vp; - ip_t from, to; - int ether_type, lenin; -cp - memset(&vp, 0, sizeof(vp)); + if(c->status.remove) + continue; - if(taptype = 1) - { - if((lenin = read(tap_fd, vp.data, MTU)) <= 0) - { - syslog(LOG_ERR, _("Error while reading from tapdevice: %m")); - return; - } - vp.len = lenin; - } - else - { - if((lenin = read(tap_fd, &vp, MTU)) <= 0) + if(FD_ISSET(c->socket, f)) { - syslog(LOG_ERR, _("Error while reading from tapdevice: %m")); - return; + if(c->status.connecting) + { + c->status.connecting = 0; + getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len); + if(!result) + finish_connecting(c); + else + { + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_DEBUG, _("Error while connecting to %s (%s): %s"), c->name, c->hostname, strerror(result)); + close(c->socket); + do_outgoing_connection(c); + continue; + } + } + if(receive_meta(c) < 0) + { + terminate_connection(c, c->status.active); + continue; + } } - vp.len = lenin - 2; } - total_tap_in += lenin; - - ether_type = ntohs(*((unsigned short*)(&vp.data[12]))); - if(ether_type != 0x0800) + for(i = 0; i < listen_sockets; i++) { - if(debug_lvl > 3) - syslog(LOG_INFO, _("Non-IP ethernet frame %04x from %02x:%02x:%02x:%02x:%02x:%02x"), ether_type, MAC_ADDR_V(vp.data[6])); - return; + 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); } - - if(lenin < 32) - { - if(debug_lvl > 3) - syslog(LOG_INFO, _("Dropping short packet from %02x:%02x:%02x:%02x:%02x:%02x"), MAC_ADDR_V(vp.data[6])); - return; - } - - from = ntohl(*((unsigned long*)(&vp.data[26]))); - to = ntohl(*((unsigned long*)(&vp.data[30]))); - - send_packet(to, &vp); cp } @@ -1167,59 +341,108 @@ void main_loop(void) struct timeval tv; int r; time_t last_ping_check; + event_t *event; cp - last_ping_check = time(NULL); + last_ping_check = now; + + srand(now); for(;;) { - tv.tv_sec = timeout; + now = time(NULL); + + tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */ tv.tv_usec = 0; - prune_conn_list(); build_fdset(&fset); if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0) { - if(errno != EINTR) /* because of alarm */ + if(errno != EINTR && errno != EAGAIN) { - syslog(LOG_ERR, _("Error while waiting for input: %m")); + syslog(LOG_ERR, _("Error while waiting for input: %s"), strerror(errno)); + cp_trace(); + dump_connections(); return; } + + continue; } - if(sighup) + check_network_activity(&fset); + + if(do_purge) { - sighup = 0; -/* FIXME: reprogram this. - if(debug_lvl > 1) - syslog(LOG_INFO, _("Rereading configuration file")); - close_network_connections(); - clear_config(); - if(read_config_file(&config, configfilename)) + 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) { - syslog(LOG_ERR, _("Unable to reread configuration file, exiting")); - exit(0); + if(debug_lvl >= DEBUG_STATUS) + syslog(LOG_INFO, _("Regenerating symmetric key")); + + RAND_pseudo_bytes(myself->key, myself->keylength); + send_key_changed(myself->connection, myself); + keyexpires = now + keylifetime; } - sleep(5); - setup_network_connections(); -*/ - continue; } - if(last_ping_check + timeout < time(NULL)) - /* Let's check if everybody is still alive */ - { - check_dead_connections(); - last_ping_check = time(NULL); - } - if(r > 0) + while((event = get_expired_event())) + { + event->handler(event->data); + free(event); + } + + if(sigalrm) + { + syslog(LOG_INFO, _("Flushing event queue")); + + while(event_tree->head) + { + event = (event_t *)event_tree->head->data; + event->handler(event->data); + event_del(event); + } + sigalrm = 0; + } + + if(sighup) { - check_network_activity(&fset); + sighup = 0; + close_network_connections(); + exit_configuration(&config_tree); + + syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds...")); + sleep(5); - /* local tap data */ - if(FD_ISSET(tap_fd, &fset)) - handle_tap_input(); + init_configuration(&config_tree); + + if(read_server_config()) + { + syslog(LOG_ERR, _("Unable to reread configuration file, exitting.")); + exit(1); + } + + if(setup_network_connections()) + return; + + continue; } } cp