X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet.c;h=ae6fbed8bb1178deeba8434546d27d852b2d0b17;hp=ec28d6a9f967e0d98400f3fc67e207d1386db312;hb=ffb88ff6410f33de92db108bd1e0c3a915368214;hpb=b50523dc44bbb32f03d24573e195c071cbff3fc4 diff --git a/src/net.c b/src/net.c index ec28d6a9..8c3f9a08 100644 --- a/src/net.c +++ b/src/net.c @@ -1,6 +1,7 @@ /* net.c -- most of the network code - Copyright (C) 1998,99 Ivo Timmermans + Copyright (C) 1998-2001 Ivo Timmermans , + 2000,2001 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 @@ -15,227 +16,160 @@ 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 1.35.4.145 2001/10/31 20:22:52 guus 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 +/* SunOS really wants sys/socket.h BEFORE net/if.h, + and FreeBSD wants these lines below the rest. */ +#include +#include +#include + +#include +#include +#include + +#ifndef HAVE_RAND_PSEUDO_BYTES +#define RAND_pseudo_bytes RAND_bytes +#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 "subnet.h" +#include "process.h" +#include "route.h" +#include "device.h" -int tap_fd = -1; - -int total_tap_in = 0; -int total_tap_out = 0; -int total_socket_in = 0; -int total_socket_out = 0; +#include "system.h" -time_t last_ping_time = 0; +int maxtimeout = 900; +int seconds_till_retry = 5; -/* The global list of existing connections */ -conn_list_t *conn_list = NULL; -conn_list_t *myself = NULL; +int tcp_socket = -1; +int udp_socket = -1; -/* - strip off the MAC adresses of an ethernet frame -*/ -void strip_mac_addresses(vpn_packet_t *p) -{ - unsigned char tmp[MAXSIZE]; +int keylifetime = 0; +int keyexpires = 0; - memcpy(tmp, p->data, p->len); - p->len -= 12; - memcpy(p->data, &tmp[12], p->len); -} +int do_prune = 0; -/* - reassemble MAC addresses -*/ -void add_mac_addresses(vpn_packet_t *p) -{ - unsigned char tmp[MAXSIZE]; - - 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); -} +/* VPN packet I/O */ -int xsend(conn_list_t *cl, void *packet) +void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { - int r; - real_packet_t rp; - - do_encrypt((vpn_packet_t*)packet, &rp, cl->key); - rp.from = myself->vpn_ip; - - if(debug_lvl > 3) - syslog(LOG_ERR, "Sent %d bytes to %lx", rp.len, cl->vpn_ip); - - if((r = send(cl->socket, (char*)&rp, rp.len, 0)) < 0) - { - syslog(LOG_ERR, "Error sending data: %m"); - return -1; - } + vpn_packet_t outpkt; + int outlen, outpad; + EVP_CIPHER_CTX ctx; +cp + /* Decrypt the packet */ - total_socket_out += r; + EVP_DecryptInit(&ctx, myself->cipher, myself->key, myself->key + myself->cipher->key_len); + EVP_DecryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len); + EVP_DecryptFinal(&ctx, outpkt.salt + outlen, &outpad); + outlen += outpad; + outpkt.len = outlen - sizeof(outpkt.salt); - return 0; + receive_packet(n, &outpkt); +cp } -/* - write as many bytes as possible to the tap - device, possibly in multiple turns. -*/ -int write_n(int fd, void *buf, size_t len) +void receive_tcppacket(connection_t *c, char *buffer, int len) { - int r, done = 0; - - do - { - if((r = write(fd, buf, len)) < 0) - return -1; - len -= r; - buf += r; - done += r; - } while(len > 0); - - return done; + vpn_packet_t outpkt; +cp + outpkt.len = len; + memcpy(outpkt.data, buffer, len); + + receive_packet(c->node, &outpkt); +cp } -int xrecv(conn_list_t *cl, void *packet) +void receive_packet(node_t *n, vpn_packet_t *packet) { - vpn_packet_t vp; - int lenin; - - do_decrypt((real_packet_t*)packet, &vp, cl->key); - add_mac_addresses(&vp); - - if((lenin = write_n(tap_fd, &vp, vp.len + 2)) < 0) - syslog(LOG_ERR, "Can't write to tap device: %m"); - else - total_tap_out += lenin; +cp + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), packet->len, n->name, n->hostname); - return 0; + route_incoming(n, packet); +cp } -/* - 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) +void send_udppacket(node_t *n, vpn_packet_t *inpkt) { - queue_element_t *e, *p; - - if(debug_lvl > 3) - syslog(LOG_DEBUG, "packet to queue: %d", s); - - e = xmalloc(sizeof(queue_element_t)); - e->packet = xmalloc(s); - memcpy(e->packet, packet, s); - if(!*q) + vpn_packet_t outpkt; + int outlen, outpad; + EVP_CIPHER_CTX ctx; + struct sockaddr_in to; + socklen_t tolen = sizeof(to); + vpn_packet_t *copy; +cp + if(!n->status.validkey) { - *q = xmalloc(sizeof(packet_queue_t)); - (*q)->head = (*q)->tail = NULL; - } + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"), + n->name, n->hostname); - e->next = NULL; + /* Since packet is on the stack of handle_tap_input(), + we have to make a copy of it first. */ - if((*q)->tail != NULL) - (*q)->tail->next = e; + copy = xmalloc(sizeof(vpn_packet_t)); + memcpy(copy, inpkt, sizeof(vpn_packet_t)); - (*q)->tail = e; + list_insert_tail(n->queue, copy); - if((*q)->head == NULL) - (*q)->head = e; -} + if(!n->status.waitingforkey) + send_req_key(n->nexthop->connection, myself, n); + return; + } -/* - 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, *prev = NULL, *next = NULL; + /* Encrypt the packet. */ - for(p = pq->head; p != NULL; ) - { - next = p->next; + RAND_pseudo_bytes(inpkt->salt, sizeof(inpkt->salt)); -cp - if(!function(cl, p->packet)) - { - if(prev) - prev->next = next; - else - pq->head = next; + EVP_EncryptInit(&ctx, n->cipher, n->key, n->key + n->cipher->key_len); + EVP_EncryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len + sizeof(inpkt->salt)); + EVP_EncryptFinal(&ctx, outpkt.salt + outlen, &outpad); + outlen += outpad; -cp - free(p->packet); -cp - free(p); -cp - } - else - prev = p; -cp + to.sin_family = AF_INET; + to.sin_addr.s_addr = htonl(n->address); + to.sin_port = htons(n->port); - p = next; - } - - if(debug_lvl > 3) - syslog(LOG_DEBUG, "queue flushed"); -} - -/* - 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 > 1) - syslog(LOG_DEBUG, "Flushing send queue for " IP_ADDR_S, - IP_ADDR_V(cl->vpn_ip)); - flush_queue(cl, cl->sq, xsend); - } -cp - - if(cl->rq) + if((sendto(udp_socket, (char *) outpkt.salt, outlen, 0, (const struct sockaddr *)&to, tolen)) < 0) { - if(debug_lvl > 1) - syslog(LOG_DEBUG, "Flushing receive queue for " IP_ADDR_S, - IP_ADDR_V(cl->vpn_ip)); - flush_queue(cl, cl->rq, xrecv); + syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"), + n->name, n->hostname); + return; } cp } @@ -243,172 +177,172 @@ cp /* send a packet to the given vpn ip. */ -int send_packet(ip_t to, vpn_packet_t *packet) +void send_packet(node_t *n, vpn_packet_t *packet) { - conn_list_t *cl; +cp + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), + packet->len, n->name, n->hostname); - if((cl = lookup_conn(to)) == NULL) + if(n == myself) { - if(debug_lvl > 2) + if(debug_lvl >= DEBUG_TRAFFIC) { - syslog(LOG_NOTICE, "trying to look up " IP_ADDR_S " 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; + syslog(LOG_NOTICE, _("Packet is looping back to us!")); } - } -cp - if(my_key_expiry <= time(NULL)) - regenerate_keys(); + return; + } -cp - if(!cl->status.dataopen) - if(setup_vpn_connection(cl) < 0) - return -1; -cp + if(n->via != n && debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_ERR, _("Sending packet to %s via %s (%s)"), + n->name, n->via->name, n->via->hostname); - if(!cl->status.validkey) + if((myself->options | n->via->options) & OPTION_TCPONLY) { - add_queue(&(cl->sq), packet, packet->len + 2); - if(!cl->status.waitingforkey) - send_key_request(to); - return 0; + if(send_tcppacket(n->via->connection, packet)) + terminate_connection(n->via->connection, 1); } + else + send_udppacket(n->via, packet); +} + +/* Broadcast a packet to all active direct connections */ +void broadcast_packet(node_t *from, vpn_packet_t *packet) +{ + avl_node_t *node; + connection_t *c; cp - if(!cl->status.active) + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"), + packet->len, from->name, from->hostname); + + for(node = connection_tree->head; node; node = node->next) { - 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? */ + c = (connection_t *)node->data; + if(c->status.active && c != from->nexthop->connection) + send_packet(c->node, packet); } - - /* can we send it? can we? can we? huh? */ cp - return xsend(cl, packet); } -int send_broadcast(conn_list_t *cl, vpn_packet_t *packet) +void flush_queue(node_t *n) { - conn_list_t *p; - - for(p = cl; p != NULL; p = p->next) - if(send_packet(p->real_ip, packet) < 0) - { - syslog(LOG_ERR, "Could not send a broadcast packet to %08lx (%08lx): %m", - p->vpn_ip, p->real_ip); - break; /* FIXME: should retry later, and send a ping over the metaconnection. */ - } - - return 0; -} - -/* - open the local ethertap device -*/ -int setup_tap_fd(void) -{ - int nfd; - const char *tapfname; - config_t const *cfg; - - if((cfg = get_config_val(tapdevice)) == NULL) - tapfname = "/dev/tap0"; - else - tapfname = cfg->data.ptr; + list_node_t *node, *next; +cp + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname); - if((nfd = open(tapfname, O_RDWR | O_NONBLOCK)) < 0) + for(node = n->queue->head; node; node = next) { - syslog(LOG_ERR, "Could not open %s: %m", tapfname); - return -1; + next = node->next; + send_udppacket(n, (vpn_packet_t *)node->data); + list_delete_node(n->queue, node); } - - tap_fd = nfd; - return 0; +cp } -/* - set up the socket that we listen on for incoming - (tcp) connections -*/ -int setup_listen_meta_socket(int port) +/* Setup sockets */ + +int setup_listen_socket(int port) { int nfd, flags; struct sockaddr_in a; - const int one = 1; - + int option; + char *interface; + char *address; + ip_mask_t *ipmask; +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"); + syslog(LOG_ERR, _("Creating metasocket failed: %m")); 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; } + /* Optimize TCP settings */ + + option = 1; + setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option)); + setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option)); +#ifdef HAVE_LINUX + setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); + + option = IPTOS_LOWDELAY; + setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option)); + + if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface)) + if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface))) + { + close(nfd); + syslog(LOG_ERR, _("Can't bind to interface %s: %m"), interface); + return -1; + } +#endif + memset(&a, 0, sizeof(a)); a.sin_family = AF_INET; - a.sin_port = htons(port); a.sin_addr.s_addr = htonl(INADDR_ANY); + a.sin_port = htons(port); + + if(get_config_string(lookup_config(config_tree, "BindToAddress"), &address)) + { + ipmask = strtoip(address); + if(ipmask) + { + a.sin_addr.s_addr = htonl(ipmask->address); + free(ipmask); + } + } if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr))) { - syslog(LOG_ERR, "Can't bind to port %hd/tcp: %m", port); + 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 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"); + 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"); - 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) { - syslog(LOG_ERR, "fcntl: %m"); + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "fcntl"); return -1; } @@ -419,291 +353,517 @@ int setup_vpn_in_socket(int port) if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr))) { - syslog(LOG_ERR, "Can't bind to port %hd/udp: %m", port); + close(nfd); + syslog(LOG_ERR, _("Can't bind to port %hd/udp: %m"), port); return -1; } - +cp return nfd; } -/* - setup an outgoing meta (tcp) socket -*/ -int setup_outgoing_meta_socket(conn_list_t *cl) +int setup_outgoing_socket(connection_t *c) { int flags; struct sockaddr_in a; - config_t const *cfg; +cp + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname); - if((cfg = get_config_val(upstreamport)) == NULL) - cl->port = 655; - else - cl->port = cfg->data.val; + c->socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); - cl->meta_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); - if(cl->meta_socket == -1) + if(c->socket == -1) { - syslog(LOG_ERR, "Creating socket failed: %m"); + syslog(LOG_ERR, _("Creating socket for %s port %d failed: %m"), + c->hostname, c->port); return -1; } + /* Bind first to get a fix on our source port??? + a.sin_family = AF_INET; - a.sin_port = htons(cl->port); - a.sin_addr.s_addr = htonl(cl->real_ip); + a.sin_port = htons(0); + a.sin_addr.s_addr = htonl(INADDR_ANY); - if(connect(cl->meta_socket, (struct sockaddr *)&a, sizeof(a)) == -1) + if(bind(c->socket, (struct sockaddr *)&a, sizeof(struct sockaddr))) { - syslog(LOG_ERR, IP_ADDR_S ":%d: %m", IP_ADDR_V(cl->real_ip), cl->port); + close(c->socket); + syslog(LOG_ERR, _("System call `%s' failed: %m"), "bind"); 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"); - return -1; - } + */ - cl->hostname = hostlookup(htonl(cl->real_ip)); + /* Optimize TCP settings? - syslog(LOG_INFO, "Connected to %s:%hd" , cl->hostname, cl->port); + option = 1; + setsockopt(c->socket, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option)); +#ifdef HAVE_LINUX + setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); - return 0; -} + option = IPTOS_LOWDELAY; + setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option)); +#endif -/* - 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(ip_t ip) -{ - conn_list_t *ncn; + */ - ncn = new_conn_list(); - ncn->real_ip = ip; + /* Connect */ - if(setup_outgoing_meta_socket(ncn) < 0) + a.sin_family = AF_INET; + a.sin_port = htons(c->port); + a.sin_addr.s_addr = htonl(c->address); + + if(connect(c->socket, (struct sockaddr *)&a, sizeof(a)) == -1) { - syslog(LOG_ERR, "Could not set up a meta connection."); - free_conn_element(ncn); + close(c->socket); + syslog(LOG_ERR, _("%s port %hd: %m"), c->hostname, c->port); return -1; } - ncn->status.meta = 1; - ncn->status.outgoing = 1; - ncn->next = conn_list; - conn_list = ncn; + flags = fcntl(c->socket, F_GETFL); + + if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) + { + close(c->socket); + syslog(LOG_ERR, _("fcntl for %s port %d: %m"), + c->hostname, c->port); + return -1; + } + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_INFO, _("Connected to %s port %hd"), + c->hostname, c->port); +cp return 0; } -/* - set up the local sockets (listen only) -*/ -int setup_myself(void) +int setup_outgoing_connection(char *name) { - config_t const *cfg; + connection_t *c; + node_t *n; + struct hostent *h; +cp + n = lookup_node(name); + + if(n) + if(n->connection) + { + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_INFO, _("Already connected to %s"), name); + return 0; + } - myself = new_conn_list(); + c = new_connection(); + c->name = xstrdup(name); - if(!(cfg = get_config_val(myvpnip))) + init_configuration(&c->config_tree); + read_connection_config(c); + + if(!get_config_string(lookup_config(c->config_tree, "Address"), &c->hostname)) { - syslog(LOG_ERR, "No value for my VPN IP given"); + syslog(LOG_ERR, _("No address specified for %s"), c->name); + free_connection(c); return -1; } - myself->vpn_ip = cfg->data.ip->ip; - myself->vpn_mask = cfg->data.ip->mask; - - if(!(cfg = get_config_val(listenport))) - myself->port = 655; - else - myself->port = cfg->data.val; + if(!get_config_port(lookup_config(c->config_tree, "Port"), &c->port)) + { + syslog(LOG_ERR, _("No port specified for %s"), c->name); + free_connection(c); + return -1; + } - if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0) + if(!(h = gethostbyname(c->hostname))) { - syslog(LOG_ERR, "Unable to set up a listening socket"); + syslog(LOG_ERR, _("Error looking up `%s': %m"), c->hostname); + free_connection(c); return -1; } - if((myself->socket = setup_vpn_in_socket(myself->port)) < 0) + c->address = ntohl(*((ipv4_t*)(h->h_addr_list[0]))); + c->hostname = hostlookup(htonl(c->address)); + + if(setup_outgoing_socket(c) < 0) { - syslog(LOG_ERR, "Unable to set up an incoming vpn data socket"); - close(myself->meta_socket); + syslog(LOG_ERR, _("Could not set up a meta connection to %s (%s)"), + c->name, c->hostname); + free_connection(c); return -1; } - myself->status.active = 1; + c->status.outgoing = 1; + c->last_ping_time = time(NULL); - syslog(LOG_NOTICE, "Ready: listening on port %d.", myself->port); + connection_add(c); + send_id(c); +cp return 0; } -/* - setup all initial network connections -*/ -int setup_network_connections(void) +int read_rsa_public_key(connection_t *c) { - config_t const *cfg; + FILE *fp; + char *fname; + char *key; + void *result; +cp + if(!c->rsa_key) + c->rsa_key = RSA_new(); - if((cfg = get_config_val(pingtimeout)) == NULL) - timeout = 10; - else - timeout = cfg->data.val; + /* First, check for simple PublicKey statement */ - if(setup_tap_fd() < 0) - return -1; + if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) + { + BN_hex2bn(&c->rsa_key->n, key); + BN_hex2bn(&c->rsa_key->e, "FFFF"); + return 0; + } - if(setup_myself() < 0) - return -1; + /* Else, check for PublicKeyFile statement and read it */ - if((cfg = get_config_val(upstreamip)) == NULL) - /* No upstream IP given, we're listen only. */ - return 0; + if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) + { + if(is_safe_path(fname)) + { + if((fp = fopen(fname, "r")) == NULL) + { + syslog(LOG_ERR, _("Error reading RSA public key file `%s': %m"), + fname); + return -1; + } + result = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL); + fclose(fp); + if(!result) + { + syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %m"), + fname); + return -1; + } + return 0; + } + else + return -1; + } - if(setup_outgoing_connection(cfg->data.ip->ip)) - return -1; + /* Else, check if a harnessed public key is in the config file */ - return 0; + result = NULL; + + asprintf(&fname, "%s/hosts/%s", confbase, c->name); + if((fp = fopen(fname, "r"))) + { + result = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL); + fclose(fp); + free(fname); + } + + free(fname); + + if(result) + return 0; + else + { + syslog(LOG_ERR, _("No public key for %s specified!"), c->name); + return -1; + } } -RETSIGTYPE -sigalrm_handler(int a) +int read_rsa_private_key(void) { - config_t const *cfg; - static int seconds_till_retry; - - cfg = get_config_val(upstreamip); + FILE *fp; + void *result; + char *fname, *key; +cp + if(!myself->connection->rsa_key) + myself->connection->rsa_key = RSA_new(); - if(!setup_outgoing_connection(cfg->data.ip->ip)) + if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) { - signal(SIGALRM, SIG_IGN); - seconds_till_retry = 5; + BN_hex2bn(&myself->connection->rsa_key->d, key); + BN_hex2bn(&myself->connection->rsa_key->e, "FFFF"); + } + else if(get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname)) + { + if((fp = fopen(fname, "r")) == NULL) + { + syslog(LOG_ERR, _("Error reading RSA private key file `%s': %m"), + fname); + return -1; + } + result = PEM_read_RSAPrivateKey(fp, &myself->connection->rsa_key, NULL, NULL); + fclose(fp); + if(!result) + { + syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %m"), + fname); + return -1; + } } else { - signal(SIGALRM, sigalrm_handler); - seconds_till_retry += 5; - alarm(seconds_till_retry); - syslog(LOG_ERR, "Still failed to connect to other. Will retry in %d seconds.", - seconds_till_retry); + syslog(LOG_ERR, _("No private key for tinc daemon specified!")); + return -1; } +cp + return 0; } /* - close all open network connections + Configure node_t myself and set up the local sockets (listen only) */ -void close_network_connections(void) +int setup_myself(void) { - conn_list_t *p; + config_t *cfg; + subnet_t *subnet; + char *name, *mode; + int choice; +cp + myself = new_node(); + myself->connection = new_connection(); + init_configuration(&myself->connection->config_tree); + + asprintf(&myself->hostname, _("MYSELF")); + asprintf(&myself->connection->hostname, _("MYSELF")); + + myself->connection->options = 0; + myself->connection->protocol_version = PROT_CURRENT; - for(p = conn_list; p != NULL; p = p->next) + if(!get_config_string(lookup_config(config_tree, "Name"), &name)) /* Not acceptable */ { - 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); - } + syslog(LOG_ERR, _("Name for tinc daemon required!")); + return -1; } - if(myself) - if(myself->status.active) - { - close(myself->meta_socket); - close(myself->socket); - } + if(check_id(name)) + { + syslog(LOG_ERR, _("Invalid name for myself!")); + free(name); + return -1; + } - close(tap_fd); - destroy_conn_list(); + myself->name = name; + myself->connection->name = xstrdup(name); - syslog(LOG_NOTICE, "Terminating."); - return; -} +cp + if(read_rsa_private_key()) + return -1; + + if(read_connection_config(myself->connection)) + { + syslog(LOG_ERR, _("Cannot open host configuration file for myself!")); + return -1; + } + + if(read_rsa_public_key(myself->connection)) + return -1; +cp /* - create a data (udp) socket + if(RSA_check_key(rsa_key) != 1) + { + syslog(LOG_ERR, _("Invalid public/private keypair!")); + return -1; + } */ -int setup_vpn_connection(conn_list_t *cl) -{ - int nfd, flags; - struct sockaddr_in a; + if(!get_config_port(lookup_config(myself->connection->config_tree, "Port"), &myself->port)) + myself->port = 655; + + myself->connection->port = myself->port; - if(debug_lvl > 1) - syslog(LOG_DEBUG, "Opening UDP socket to " IP_ADDR_S, IP_ADDR_V(cl->real_ip)); +/* Read in all the subnets specified in the host configuration file */ - nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); - if(nfd == -1) + cfg = lookup_config(myself->connection->config_tree, "Subnet"); + + while(cfg) { - syslog(LOG_ERR, "Creating data socket failed: %m"); - return -1; + if(!get_config_subnet(cfg, &subnet)) + return -1; + + subnet_add(myself, subnet); + + cfg = lookup_config_next(myself->connection->config_tree, cfg); } - a.sin_family = AF_INET; - a.sin_port = htons(cl->port); - a.sin_addr.s_addr = htonl(cl->real_ip); +cp + /* Check some options */ + + if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice)) + if(choice) + myself->options |= OPTION_INDIRECT; + + if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice)) + if(choice) + myself->options |= OPTION_TCPONLY; + + if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice)) + if(choice) + myself->options |= OPTION_INDIRECT; - if(connect(nfd, (struct sockaddr *)&a, sizeof(a)) == -1) + if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice)) + if(choice) + myself->options |= OPTION_TCPONLY; + + if(myself->options & OPTION_TCPONLY) + myself->options |= OPTION_INDIRECT; + + if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) + { + if(!strcasecmp(mode, "router")) + routing_mode = RMODE_ROUTER; + else if (!strcasecmp(mode, "switch")) + routing_mode = RMODE_SWITCH; + else if (!strcasecmp(mode, "hub")) + routing_mode = RMODE_HUB; + else + { + syslog(LOG_ERR, _("Invalid routing mode!")); + return -1; + } + } + else + routing_mode = RMODE_ROUTER; + +cp + /* Open sockets */ + + if((tcp_socket = setup_listen_socket(myself->port)) < 0) { - syslog(LOG_ERR, "Create connection to %08lx:%d failed: %m", ntohs(cl->real_ip), - cl->port); + syslog(LOG_ERR, _("Unable to set up a listening TCP socket!")); return -1; } - flags = fcntl(nfd, F_GETFL); - if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) + if((udp_socket = setup_vpn_in_socket(myself->port)) < 0) { - syslog(LOG_ERR, "This is a bug: %s:%d: %d:%m", __FILE__, __LINE__, nfd); + syslog(LOG_ERR, _("Unable to set up a listening UDP socket!")); return -1; } +cp + /* Generate packet encryption key */ + + myself->cipher = EVP_bf_cbc(); - cl->socket = nfd; - cl->status.dataopen = 1; + myself->keylength = myself->cipher->key_len + myself->cipher->iv_len; + myself->key = (char *)xmalloc(myself->keylength); + RAND_pseudo_bytes(myself->key, myself->keylength); + + if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime)) + keylifetime = 3600; + + keyexpires = time(NULL) + keylifetime; +cp + /* Done */ + + myself->nexthop = myself; + myself->via = myself; + myself->status.active = 1; + node_add(myself); + + syslog(LOG_NOTICE, _("Ready: listening on port %hd"), myself->port); +cp return 0; } /* - handle an incoming tcp connect call and open - a connection to it. + setup all initial network connections */ -conn_list_t *create_new_connection(int sfd) +int setup_network_connections(void) { - conn_list_t *p; - struct sockaddr_in ci; - int len = sizeof(ci); +cp + init_connections(); + init_subnets(); + init_nodes(); + init_edges(); - p = new_conn_list(); + if(get_config_int(lookup_config(config_tree, "PingTimeout"), &timeout)) + { + if(timeout < 1) + { + timeout = 86400; + } + } + else + timeout = 60; + + if(setup_device() < 0) + return -1; + + /* Run tinc-up script to further initialize the tap interface */ + execute_script("tinc-up"); + + if(setup_myself() < 0) + return -1; + + signal(SIGALRM, try_outgoing_connections); + alarm(5); +cp + return 0; +} - if(getpeername(sfd, &ci, &len) < 0) +/* + close all open network connections +*/ +void close_network_connections(void) +{ + avl_node_t *node, *next; + connection_t *c; +cp + for(node = connection_tree->head; node; node = next) { - syslog(LOG_ERR, "Error: getpeername: %m"); - return NULL; + next = node->next; + c = (connection_t *)node->data; + c->status.outgoing = 0; + terminate_connection(c, 0); } - 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; + terminate_connection(myself->connection, 0); + +// destroy_trees(); + exit_edges(); + exit_subnets(); + exit_nodes(); + exit_connections(); - syslog(LOG_NOTICE, "Connection from %s:%d", p->hostname, htons(ci.sin_port)); + execute_script("tinc-down"); - if(send_basic_info(p) < 0) + close_device(); +cp + return; +} + +/* + handle an incoming tcp connect call and open + a connection to it. +*/ +connection_t *create_new_connection(int sfd) +{ + connection_t *c; + struct sockaddr_in ci; + int len = sizeof(ci); +cp + c = new_connection(); + + if(getpeername(sfd, (struct sockaddr *) &ci, (socklen_t *) &len) < 0) { - free(p); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "getpeername"); + close(sfd); return NULL; } - return p; + c->address = ntohl(ci.sin_addr.s_addr); + c->hostname = hostlookup(ci.sin_addr.s_addr); + c->port = htons(ci.sin_port); /* This one will be overwritten later */ + c->socket = sfd; + c->last_ping_time = time(NULL); + + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Connection from %s port %d"), + c->hostname, htons(ci.sin_port)); + + c->allow_request = ID; +cp + return c; } /* @@ -711,21 +871,21 @@ conn_list_t *create_new_connection(int sfd) */ void build_fdset(fd_set *fs) { - conn_list_t *p; - + avl_node_t *node; + connection_t *c; +cp FD_ZERO(fs); - for(p = conn_list; p != NULL; p = p->next) + for(node = connection_tree->head; node; node = node->next) { - if(p->status.meta) - FD_SET(p->meta_socket, fs); - if(p->status.dataopen) - FD_SET(p->socket, fs); + c = (connection_t *)node->data; + FD_SET(c->socket, fs); } - FD_SET(myself->meta_socket, fs); - FD_SET(myself->socket, fs); - FD_SET(tap_fd, fs); + FD_SET(tcp_socket, fs); + FD_SET(udp_socket, fs); + FD_SET(device_fd, fs); +cp } /* @@ -733,214 +893,250 @@ void build_fdset(fd_set *fs) udp socket and write it to the ethertap device after being decrypted */ -int handle_incoming_vpn_data(conn_list_t *cl) +void handle_incoming_vpn_data(void) { - real_packet_t rp; - int lenin; + vpn_packet_t pkt; int x, l = sizeof(x); - conn_list_t *f; - - if(getsockopt(cl->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) + struct sockaddr_in from; + socklen_t fromlen = sizeof(from); + node_t *n; +cp + if(getsockopt(udp_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) { - syslog(LOG_ERR, "This is a bug: %s:%d: %d:%m", __FILE__, __LINE__, cl->socket); - return -1; + syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"), + __FILE__, __LINE__, udp_socket); + return; } if(x) { - syslog(LOG_ERR, "Incoming data socket error: %s", sys_errlist[x]); - return -1; + syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x)); + return; } - rp.len = -1; - lenin = recvfrom(cl->socket, &rp, MTU, 0, NULL, NULL); - if(lenin <= 0) + if((pkt.len = recvfrom(udp_socket, (char *) pkt.salt, MTU, 0, (struct sockaddr *)&from, &fromlen)) <= 0) { - syslog(LOG_ERR, "Receiving data failed: %m"); - return -1; + syslog(LOG_ERR, _("Receiving packet failed: %m")); + return; } - total_socket_in += lenin; - if(rp.len >= 0) - { - f = lookup_conn(rp.from); - if(debug_lvl > 2) - 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); - } + n = lookup_node_udp(ntohl(from.sin_addr.s_addr), ntohs(from.sin_port)); - if(my_key_expiry <= time(NULL)) - regenerate_keys(); + if(!n) + { + syslog(LOG_WARNING, _("Received UDP packet on port %hd from unknown source %x:%hd"), myself->port, ntohl(from.sin_addr.s_addr), ntohs(from.sin_port)); + return; } - - return 0; +/* + if(n->connection) + n->connection->last_ping_time = time(NULL); +*/ + receive_udppacket(n, &pkt); +cp } /* - terminate a connection and notify the other - end before closing the sockets + Terminate a connection: + - Close the socket + - Remove associated edge and tell other connections about it if report = 1 + - Check if we need to retry making an outgoing connection + - Deactivate the host */ -void terminate_connection(conn_list_t *cl) +void terminate_connection(connection_t *c, int report) { - if(cl->status.remove) + avl_node_t *node; + connection_t *other; +cp + if(c->status.remove) return; + + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Closing connection with %s (%s)"), + c->name, c->hostname); - 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); - - close(cl->socket); - if(cl->status.meta) - close(cl->meta_socket); + c->status.remove = 1; + + if(c->socket) + close(c->socket); - if(cl->status.outgoing) + if(c->edge) { - alarm(5); - signal(SIGALRM, sigalrm_handler); - syslog(LOG_NOTICE, "Try to re-establish outgoing connection in 5 seconds."); + 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); + } + } + + edge_del(c->edge); } - - cl->status.remove = 1; -} -/* - send out a ping request to all active - connections -*/ -int send_broadcast_ping(void) -{ - conn_list_t *p; + /* Check if this was our outgoing connection */ - for(p = conn_list; p != NULL; p = p->next) + if(c->status.outgoing) { - if(p->status.remove) - continue; - if(p->status.active && p->status.meta) - { - if(send_ping(p)) - terminate_connection(p); - else - { - p->status.pinged = 1; - p->status.got_pong = 0; - } - } + c->status.outgoing = 0; + signal(SIGALRM, try_outgoing_connections); + alarm(seconds_till_retry); + syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in %d seconds"), seconds_till_retry); } - last_ping_time = time(NULL); + /* Deactivate */ - return 0; + c->status.active = 0; + if(c->node) + c->node->connection = NULL; + do_prune = 1; +cp } /* - end all connections that did not respond - to the ping probe in time + Check if the other end is active. + If we have sent packets, but didn't receive any, + then possibly the other end is dead. We send a + PING request over the meta connection. If the other + 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 && p->status.pinged && !p->status.got_pong) - { - syslog(LOG_INFO, "%s (" IP_ADDR_S ") didn't respond to ping", - p->hostname, IP_ADDR_V(p->vpn_ip)); - p->status.timeout = 1; - terminate_connection(p); - } + next = node->next; + c = (connection_t *)node->data; + if(c->last_ping_time + timeout < 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(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_WARNING, _("Timeout from %s (%s) during authentication"), + c->name, c->hostname); + terminate_connection(c, 0); + } + } } - - return 0; +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; + connection_t *new; struct sockaddr client; - int nfd, len = sizeof(struct sockaddr); - - if((nfd = accept(cl->meta_socket, &client, &len)) < 0) + int fd, len = sizeof(client); +cp + if((fd = accept(tcp_socket, &client, &len)) < 0) { - syslog(LOG_ERR, "Accepting a new connection failed: %m"); + syslog(LOG_ERR, _("Accepting a new connection failed: %m")); return -1; } - if((ncn = create_new_connection(nfd)) == NULL) + if(!(new = create_new_connection(fd))) { - shutdown(nfd, 2); - close(nfd); - syslog(LOG_NOTICE, "Closed attempted connection."); + shutdown(fd, 2); + close(fd); + syslog(LOG_NOTICE, _("Closed attempted connection")); return 0; } - ncn->status.meta = 1; - ncn->next = conn_list; - conn_list = ncn; + connection_add(new); + send_id(new); +cp return 0; } -/* - dispatch any incoming meta requests +void randomized_alarm(int seconds) +{ + unsigned char r; + RAND_pseudo_bytes(&r, 1); + alarm((seconds * (int)r) / 128 + 1); +} + +/* This function is severely fucked up. + We want to redesign it so the following rules apply: + + - Try all ConnectTo's in a row: + - if a connect() fails, try next one immediately, + - if it works, wait 5 seconds or so. + - If none of them were succesful, increase delay and retry. + - If all were succesful, don't try anymore. */ -int handle_incoming_meta_data(conn_list_t *cl) + +RETSIGTYPE +try_outgoing_connections(int a) { - int x, l = sizeof(x), lenin; - unsigned char tmp[1600]; - int request; - - 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; - } + static config_t *cfg = NULL; + static int retry = 0; + char *name; +cp + if(!cfg) + cfg = lookup_config(config_tree, "ConnectTo"); - if((lenin = recv(cl->meta_socket, &tmp, sizeof(tmp), 0)) <= 0) + if(!cfg) + return; + + while(cfg) { - syslog(LOG_ERR, "Receive failed: %m"); - return -1; + get_config_string(cfg, &name); + cfg = lookup_config_next(config_tree, cfg); /* Next time skip to next ConnectTo line */ + + if(check_id(name)) + { + syslog(LOG_ERR, _("Invalid name for outgoing connection in %s line %d"), cfg->file, cfg->line); + continue; + } + + if(setup_outgoing_connection(name)) /* function returns 0 when there are no problems */ + retry = 1; + } - request = (int)(tmp[0]); + get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout); - if(debug_lvl > 3) - syslog(LOG_DEBUG, "got request %d", request); + if(retry) + { + seconds_till_retry += 5; + if(seconds_till_retry > maxtimeout) /* Don't wait more than MAXTIMEOUT seconds. */ + seconds_till_retry = maxtimeout; - if(request_handlers[request] == NULL) - syslog(LOG_ERR, "Unknown request %d.", request); - else - if(request_handlers[request](cl, tmp, lenin) < 0) - return -1; + syslog(LOG_ERR, _("Failed to setup all outgoing connections, will retry in %d seconds"), + seconds_till_retry); - return 0; + /* Randomize timeout to avoid global synchronisation effects */ + randomized_alarm(seconds_till_retry); + } + else + { + seconds_till_retry = 5; + } +cp } /* @@ -949,147 +1145,140 @@ int handle_incoming_meta_data(conn_list_t *cl) */ void check_network_activity(fd_set *f) { - conn_list_t *p; - int x, l = sizeof(x); + connection_t *c; + avl_node_t *node; +cp + if(FD_ISSET(udp_socket, f)) + handle_incoming_vpn_data(); - for(p = conn_list; p != NULL; p = p->next) + for(node = connection_tree->head; node; node = node->next) { - if(p->status.remove) - continue; -cp - if(p->status.active) - if(FD_ISSET(p->socket, f)) + c = (connection_t *)node->data; + + if(c->status.remove) + return; + + if(FD_ISSET(c->socket, f)) + if(receive_meta(c) < 0) { - /* - 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: %s", sys_errlist[x]); - terminate_connection(p); + terminate_connection(c, c->status.active); return; - } -cp - if(p->status.meta) - if(FD_ISSET(p->meta_socket, f)) - if(handle_incoming_meta_data(p) < 0) - { - terminate_connection(p); - return; - } -cp + } } - -cp - if(FD_ISSET(myself->socket, f)) - handle_incoming_vpn_data(myself); -cp - if(FD_ISSET(myself->meta_socket, f)) - handle_new_meta_connection(myself); + + if(FD_ISSET(tcp_socket, f)) + handle_new_meta_connection(); cp } -/* - read, encrypt and send data that is - available through the ethertap device -*/ -void handle_tap_input(void) +void prune_connections(void) { - vpn_packet_t vp; - ip_t from, to; - int ether_type, lenin; - - memset(&vp, 0, sizeof(vp)); - if((lenin = read(tap_fd, &vp, MTU)) <= 0) + connection_t *c; + avl_node_t *node, *next; +cp + for(node = connection_tree->head; node; node = next) { - syslog(LOG_ERR, "Error while reading from tapdevice: %m"); - return; - } - - total_tap_in += lenin; + next = node->next; + c = (connection_t *)node->data; - 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(c->status.remove) + connection_del(c); } - - if(lenin < 32) - { - if(debug_lvl > 0) - syslog(LOG_INFO, "Dropping short packet"); - return; - } - - from = ntohl(*((unsigned long*)(&vp.data[26]))); - to = ntohl(*((unsigned long*)(&vp.data[30]))); - - if(debug_lvl > 2) - 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 > 3) - 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; -cp - strip_mac_addresses(&vp); -cp - send_packet(to, &vp); cp } /* - this is where it al happens... + this is where it all happens... */ void main_loop(void) { fd_set fset; struct timeval tv; int r; - - last_ping_time = time(NULL); + time_t last_ping_check; + int t; + vpn_packet_t packet; +cp + last_ping_check = time(NULL); for(;;) { tv.tv_sec = timeout; tv.tv_usec = 0; -cp - prune_conn_list(); -cp + if(do_prune) + { + prune_connections(); + do_prune = 0; + } + build_fdset(&fset); -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; + } } -cp - if(r == 0 || last_ping_time + timeout < time(NULL)) - /* Timeout... hm... something might be wrong. */ + if(sighup) + { + syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds")); + sighup = 0; + close_network_connections(); + exit_configuration(&config_tree); + + 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(); - send_broadcast_ping(); - continue; - } + last_ping_check = time(NULL); -cp - check_network_activity(&fset); + /* Should we regenerate our key? */ -cp - /* local tap data */ - if(FD_ISSET(tap_fd, &fset)) - handle_tap_input(); -cp + if(keyexpires < t) + { + 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 = time(NULL) + keylifetime; + } + } + + if(r > 0) + { + check_network_activity(&fset); + + /* local tap data */ + if(FD_ISSET(device_fd, &fset)) + { + if(read_packet(&packet)) + return; + else + route_outgoing(&packet); + } + } } +cp }