X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet.c;h=7ebe37bf78792b6751727df4c70094553a36edff;hp=31acd38900a0939d45e73e5f02326314b19f5407;hb=54881faf6fdbf04fb5ee56b7809439fbc50c65cb;hpb=783c8298610d5670f6e118f49bd3d1fdfa61ae1d diff --git a/src/net.c b/src/net.c index 31acd389..7ebe37bf 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) 1998-2001 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 @@ -17,12 +17,11 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: net.c,v 1.35.4.7 2000/06/26 19:39:34 guus Exp $ + $Id: net.c,v 1.35.4.96 2001/02/25 16:34:17 guus Exp $ */ #include "config.h" -#include #include #include #include @@ -31,239 +30,169 @@ #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_OPENSSL_PEM_H +# include +#else +# include +#endif + +#ifdef HAVE_TUNTAP +#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 "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(connection_t *cl, vpn_packet_t *inpkt) { - int r; - real_packet_t rp; + vpn_packet_t outpkt; + int outlen, outpad; + EVP_CIPHER_CTX ctx; + struct sockaddr_in to; + socklen_t tolen = sizeof(to); 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; - if(debug_lvl > 3) - syslog(LOG_ERR, _("Sending packet of %d bytes to " IP_ADDR_S " (%s)"), - ntohs(rp.len), IP_ADDR_V(cl->vpn_ip), cl->hostname); +/* Bypass + outlen = outpkt.len + 2; + memcpy(&outpkt, inpkt, outlen); +*/ - if((r = send(cl->socket, (char*)&rp, ntohs(rp.len), 0)) < 0) + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), + outlen, cl->name, cl->hostname); + + total_socket_out += outlen; + + to.sin_family = AF_INET; + to.sin_addr.s_addr = htonl(cl->address); + to.sin_port = htons(cl->port); + + if((sendto(myself->socket, (char *) &(outpkt.len), outlen, 0, (const struct sockaddr *)&to, tolen)) < 0) { - syslog(LOG_ERR, _("Error sending packet to " IP_ADDR_S " (%s): %m"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + 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(connection_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(debug_lvl > 3) - syslog(LOG_ERR, _("Receiving packet of %d bytes from " IP_ADDR_S " (%s)"), - ((real_packet_t*)packet)->len, IP_ADDR_V(cl->vpn_ip), cl->hostname); + /* Decrypt the packet */ - 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; + 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; - cl->want_ping = 0; - cl->last_ping_time = time(NULL); -cp - return 0; -} - -/* - add the given packet of size s to the - queue q, be it the send or receive queue +/* Bypass + outlen = outpkt.len+2; + memcpy(&outpkt, inpkt, outlen); */ -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 */ - - if((*q)->tail) /* Do we have a tail? */ - { - (*q)->tail->next = e; - e->prev = (*q)->tail; - } - else /* No tail -> no head too */ - { - (*q)->head = e; - e->prev = NULL; - } - - (*q)->tail = e; cp + return receive_packet(cl, &outpkt); } -/* Remove a queue element */ -void del_queue(packet_queue_t **q, queue_element_t *e) +int receive_packet(connection_t *cl, vpn_packet_t *packet) { -cp - free(e->packet); + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_ERR, _("Writing packet of %d bytes to tap device"), + packet->len); - if(e->next) /* There is a successor, so we are not tail */ - { - if(e->prev) /* There is a predecessor, so we are not head */ - { - e->next->prev = e->prev; - e->prev->next = e->next; - } - 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 -} + /* Fix mac address */ -/* - 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; + memcpy(packet->data, mymac.net.mac.address.x, 6); - 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(taptype == TAP_TYPE_TUNTAP) { - if(debug_lvl > 3) - syslog(LOG_DEBUG, _("Flushing send queue for " IP_ADDR_S), - IP_ADDR_V(cl->vpn_ip)); - flush_queue(cl, &(cl->sq), xsend); + if(write(tap_fd, packet->data, packet->len) < 0) + syslog(LOG_ERR, _("Can't write to tun/tap device: %m")); + else + total_tap_out += packet->len; } - - if(cl->rq) + else /* ethertap */ { - if(debug_lvl > 3) - syslog(LOG_DEBUG, _("Flushing receive queue for " IP_ADDR_S), - IP_ADDR_V(cl->vpn_ip)); - flush_queue(cl, &(cl->rq), xrecv); + if(write(tap_fd, packet->data - 2, packet->len + 2) < 0) + syslog(LOG_ERR, _("Can't write to ethertap device: %m")); + else + total_tap_out += packet->len + 2; } cp + return 0; } /* @@ -271,103 +200,84 @@ cp */ int send_packet(ip_t to, vpn_packet_t *packet) { - conn_list_t *cl; + connection_t *cl; + subnet_t *subnet; + vpn_packet_t *copy; cp - if((cl = lookup_conn(to)) == NULL) + if((subnet = lookup_subnet_ipv4(&to)) == NULL) { - if(debug_lvl > 3) + 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)); } - - /* Is this really necessary? If we can't find "to", then neither should any uplink. (GS) */ - + return -1; - - for(cl = conn_list; cl != NULL && !cl->status.outgoing; cl = cl->next); - if(!cl) - { /* No open outgoing connection has been found. */ - if(debug_lvl > 3) - syslog(LOG_NOTICE, _("There is no remote host I can send this packet to!")); - return -1; - } } + + cl = subnet->owner; - /* If we ourselves have indirectdata flag set, we should send only to our uplink! */ - - if(myself->flags & EXPORTINDIRECTDATA) + if(cl == myself) { - for(cl = conn_list; cl != NULL && !cl->status.outgoing; cl = cl->next); - if(!cl) - { /* No open outgoing connection has been found. */ - if(debug_lvl > 3) - syslog(LOG_NOTICE, _("There is no remote host I can send this packet to!")); - return -1; + if(debug_lvl >= DEBUG_TRAFFIC) + { + syslog(LOG_NOTICE, _("Packet with destination %d.%d.%d.%d is looping back to us!"), + IP_ADDR_V(to)); } - } - else - /* If indirectdata flag is set for the destination we just looked up, - * then real_ip is actually the vpn_ip of the gateway tincd - * it is behind. - */ - - if(cl->flags & INDIRECTDATA) - { - if(debug_lvl > 3) - syslog(LOG_NOTICE, _("Indirect packet to " IP_ADDR_S " via " IP_ADDR_S), - IP_ADDR_V(cl->vpn_ip), IP_ADDR_V(cl->real_ip)); - if((cl = lookup_conn(cl->real_ip)) == NULL) - { - if(debug_lvl > 3) - syslog(LOG_NOTICE, _("Indirect look up " IP_ADDR_S " in connection list failed!"), - IP_ADDR_V(to)); - - /* Gateway tincd dead? Should we kill it? (GS) */ + return -1; + } - return -1; - } - if(cl->flags & INDIRECTDATA) /* This should not happen */ - { - if(debug_lvl > 3) - syslog(LOG_NOTICE, _("Double indirection for " IP_ADDR_S), - IP_ADDR_V(to)); - return -1; - } - } + if(!cl->status.active) + { + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_INFO, _("%s (%s) is not active, dropping packet"), + cl->name, cl->hostname); - if(my_key_expiry <= time(NULL)) - regenerate_keys(); + return 0; + } - if(!cl->status.dataopen) - if(setup_vpn_connection(cl) < 0) - { - syslog(LOG_ERR, _("Could not open UDP connection to " IP_ADDR_S " (%s)"), IP_ADDR_V(cl->vpn_ip), cl->hostname); - return -1; - } - if(!cl->status.validkey) { - if(debug_lvl > 3) - syslog(LOG_INFO, _(IP_ADDR_S " (%s) has no valid key, queueing packet"), IP_ADDR_V(cl->vpn_ip), cl->hostname); - add_queue(&(cl->sq), packet, packet->len + 2); + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"), + cl->name, cl->hostname); + + /* Since packet is on the stack of handle_tap_input(), + we have to make a copy of it first. */ + + copy = xmalloc(sizeof(vpn_packet_t)); + memcpy(copy, packet, sizeof(vpn_packet_t)); + + list_insert_tail(cl->queue, copy); + if(!cl->status.waitingforkey) - send_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) + /* Check if it has to go via UDP or TCP... */ +cp + if(cl->options & OPTION_TCPONLY) + return send_tcppacket(cl, packet); + else + return xsend(cl, packet); +} + +void flush_queue(connection_t *cl) +{ + list_node_t *node, *next; +cp + if(debug_lvl >= DEBUG_TRAFFIC) + syslog(LOG_INFO, _("Flushing queue for %s (%s)"), cl->name, cl->hostname); + + for(node = cl->queue->head; node; node = next) { - if(debug_lvl > 3) - syslog(LOG_INFO, _(IP_ADDR_S " (%s) is not ready, queueing packet"), IP_ADDR_V(cl->vpn_ip), cl->hostname); - add_queue(&(cl->sq), packet, packet->len + 2); - return 0; /* We don't want to mess up, do we? */ + next = node->next; + xsend(cl, (vpn_packet_t *)node->data); + list_delete_node(cl->queue, node); } - - /* can we send it? can we? can we? huh? */ cp - return xsend(cl, packet); } /* @@ -378,19 +288,71 @@ int setup_tap_fd(void) int nfd; const char *tapfname; config_t const *cfg; +#ifdef HAVE_LINUX +# ifdef HAVE_TUNTAP + struct ifreq ifr; +# endif +#endif + cp - if((cfg = get_config_val(tapdevice)) == NULL) - tapfname = "/dev/tap0"; - else + if((cfg = get_config_val(config, config_tapdevice))) tapfname = cfg->data.ptr; - + else + { +#ifdef HAVE_LINUX +# ifdef HAVE_TUNTAP + tapfname = "/dev/misc/net/tun"; +# else + tapfname = "/dev/tap0"; +# endif +#endif +#ifdef HAVE_FREEBSD + tapfname = "/dev/tap0"; +#endif +#ifdef HAVE_SOLARIS + tapfname = "/dev/tun"; +#endif + } +cp if((nfd = open(tapfname, O_RDWR | O_NONBLOCK)) < 0) { syslog(LOG_ERR, _("Could not open %s: %m"), tapfname); return -1; } - +cp tap_fd = nfd; + + taptype = TAP_TYPE_ETHERTAP; + + /* Set default MAC address for ethertap devices */ + + mymac.type = SUBNET_MAC; + mymac.net.mac.address.x[0] = 0xfe; + mymac.net.mac.address.x[1] = 0xfd; + mymac.net.mac.address.x[2] = 0x00; + mymac.net.mac.address.x[3] = 0x00; + mymac.net.mac.address.x[4] = 0x00; + mymac.net.mac.address.x[5] = 0x00; + +#ifdef HAVE_LINUX + #ifdef HAVE_TUNTAP + /* Ok now check if this is an old ethertap or a new tun/tap thingie */ + memset(&ifr, 0, sizeof(ifr)); +cp + ifr.ifr_flags = IFF_TAP | IFF_NO_PI; + if (netname) + strncpy(ifr.ifr_name, netname, IFNAMSIZ); +cp + if (!ioctl(tap_fd, TUNSETIFF, (void *) &ifr)) + { + syslog(LOG_INFO, _("%s is a new style tun/tap device"), tapfname); + taptype = TAP_TYPE_TUNTAP; + } + #endif +#endif +#ifdef HAVE_FREEBSD + taptype = TAP_TYPE_TUNTAP; +#endif cp return 0; } @@ -404,6 +366,7 @@ 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) { @@ -413,31 +376,60 @@ 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 @@ -456,20 +448,25 @@ 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; } @@ -480,6 +477,7 @@ 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; } @@ -490,13 +488,16 @@ cp /* setup an outgoing meta (tcp) socket */ -int setup_outgoing_meta_socket(conn_list_t *cl) +int setup_outgoing_meta_socket(connection_t *cl) { int flags; 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; @@ -504,108 +505,349 @@ 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; } + /* Bind first to get a fix on our source port */ + + a.sin_family = AF_INET; + a.sin_port = htons(0); + a.sin_addr.s_addr = htonl(INADDR_ANY); + + if(bind(cl->meta_socket, (struct sockaddr *)&a, sizeof(struct sockaddr))) + { + close(cl->meta_socket); + syslog(LOG_ERR, _("System call `%s' failed: %m"), "bind"); + return -1; + } + 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; } - syslog(LOG_INFO, _("Connected to " IP_ADDR_S ":%hd"), - IP_ADDR_V(cl->real_ip), cl->port); + if(debug_lvl >= DEBUG_CONNECTIONS) + 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. + Setup an outgoing meta connection. */ -int setup_outgoing_connection(ip_t ip) +int setup_outgoing_connection(char *name) { - conn_list_t *ncn; + connection_t *ncn; + struct hostent *h; + config_t const *cfg; cp - ncn = new_conn_list(); - ncn->real_ip = ip; - ncn->hostname = hostlookup(htonl(ip)); + if(check_id(name)) + { + syslog(LOG_ERR, _("Invalid name for outgoing connection")); + return -1; + } + + ncn = new_connection(); + asprintf(&ncn->name, "%s", name); + + if(read_host_config(ncn)) + { + syslog(LOG_ERR, _("Error reading host configuration file for %s"), ncn->name); + free_connection(ncn); + return -1; + } + + if(!(cfg = get_config_val(ncn->config, config_address))) + { + syslog(LOG_ERR, _("No address specified for %s"), ncn->name); + free_connection(ncn); + return -1; + } + + if(!(h = gethostbyname(cfg->data.ptr))) + { + syslog(LOG_ERR, _("Error looking up `%s': %m"), cfg->data.ptr); + free_connection(ncn); + return -1; + } + + ncn->address = ntohl(*((ip_t*)(h->h_addr_list[0]))); + ncn->hostname = hostlookup(htonl(ncn->address)); if(setup_outgoing_meta_socket(ncn) < 0) { - syslog(LOG_ERR, _("Could not set up a meta connection!")); - free_conn_element(ncn); + syslog(LOG_ERR, _("Could not set up a meta connection to %s"), + ncn->hostname); + free_connection(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); + + connection_add(ncn); + + send_id(ncn); +cp + return 0; +} + +int read_rsa_public_key(connection_t *cl) +{ + config_t const *cfg; + FILE *fp; + char *fname; + void *result; +cp + if(!cl->rsa_key) + cl->rsa_key = RSA_new(); + + /* First, check for simple PublicKey statement */ + + if((cfg = get_config_val(cl->config, config_publickey))) + { + BN_hex2bn(&cl->rsa_key->n, cfg->data.ptr); + BN_hex2bn(&cl->rsa_key->e, "FFFF"); + return 0; + } + + /* Else, check for PublicKeyFile statement and read it */ + + if((cfg = get_config_val(cl->config, config_publickeyfile))) + { + if(is_safe_path(cfg->data.ptr)) + { + if((fp = fopen(cfg->data.ptr, "r")) == NULL) + { + syslog(LOG_ERR, _("Error reading RSA public key file `%s': %m"), + cfg->data.ptr); + return -1; + } + result = PEM_read_RSAPublicKey(fp, &cl->rsa_key, NULL, NULL); + fclose(fp); + if(!result) + { + syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %m"), + cfg->data.ptr); + return -1; + } + return 0; + } + else + return -1; + } + + /* Else, check if a harnessed public key is in the config file */ + + asprintf(&fname, "%s/hosts/%s", confbase, cl->name); + if((fp = fopen(fname, "r"))) + { + result = PEM_read_RSAPublicKey(fp, &cl->rsa_key, NULL, NULL); + fclose(fp); + free(fname); + if(result) + return 0; + } + + free(fname); + + /* Nothing worked. */ + + syslog(LOG_ERR, _("No public key for %s specified!"), cl->name); +cp + return -1; +} + +int read_rsa_private_key(void) +{ + config_t const *cfg; + FILE *fp; + void *result; +cp + if(!myself->rsa_key) + myself->rsa_key = RSA_new(); + + if((cfg = get_config_val(config, config_privatekey))) + { + BN_hex2bn(&myself->rsa_key->d, cfg->data.ptr); + BN_hex2bn(&myself->rsa_key->e, "FFFF"); + } + else if((cfg = get_config_val(config, config_privatekeyfile))) + { + if((fp = fopen(cfg->data.ptr, "r")) == NULL) + { + syslog(LOG_ERR, _("Error reading RSA private key file `%s': %m"), + cfg->data.ptr); + return -1; + } + result = PEM_read_RSAPrivateKey(fp, &myself->rsa_key, NULL, NULL); + fclose(fp); + if(!result) + { + syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %m"), + cfg->data.ptr); + return -1; + } + } + else + { + syslog(LOG_ERR, _("No private key for tinc daemon specified!")); + return -1; + } cp return 0; } /* - set up the local sockets (listen only) + Configure connection_t myself and set up the local sockets (listen only) */ int setup_myself(void) { config_t const *cfg; + config_t *next; + subnet_t *net; cp - myself = new_conn_list(); + myself = new_connection(); + + asprintf(&myself->hostname, "MYSELF"); + myself->flags = 0; + myself->protocol_version = PROT_CURRENT; - if(!(cfg = get_config_val(myvpnip))) + 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->hostname = hostlookup(htonl(myself->vpn_ip)); - myself->vpn_mask = cfg->data.ip->mask; - myself->flags = 0; + if(check_id(myself->name)) + { + syslog(LOG_ERR, _("Invalid name for myself!")); + return -1; + } +cp + if(read_rsa_private_key()) + return -1; + + if(read_host_config(myself)) + { + syslog(LOG_ERR, _("Cannot open host configuration file for myself!")); + return -1; + } - if(!(cfg = get_config_val(listenport))) + if(read_rsa_public_key(myself)) + return -1; +cp + +/* + if(RSA_check_key(myself->rsa_key) != 1) + { + syslog(LOG_ERR, _("Invalid public/private keypair!")); + return -1; + } +*/ + if(!(cfg = get_config_val(myself->config, config_port))) myself->port = 655; else myself->port = cfg->data.val; - if(cfg = get_config_val(indirectdata)) - if(cfg->data.val) + if((cfg = get_config_val(myself->config, config_indirectdata))) + if(cfg->data.val == stupid_true) myself->flags |= EXPORTINDIRECTDATA; + if((cfg = get_config_val(myself->config, config_tcponly))) + if(cfg->data.val == stupid_true) + myself->flags |= TCPONLY; + +/* Read in all the subnets specified in the host configuration file */ + + for(next = myself->config; (cfg = get_config_val(next, config_subnet)); next = cfg->next) + { + net = new_subnet(); + net->type = SUBNET_IPV4; + net->net.ipv4.address = cfg->data.ip->address; + net->net.ipv4.mask = cfg->data.ip->mask; + + /* Teach newbies what subnets are... */ + + if((net->net.ipv4.address & net->net.ipv4.mask) != net->net.ipv4.address) + { + syslog(LOG_ERR, _("Network address and subnet mask do not match!")); + return -1; + } + + subnet_add(myself, net); + } + if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0) { - syslog(LOG_ERR, _("Unable to set up a listening socket")); + syslog(LOG_ERR, _("Unable to set up a listening TCP socket!")); return -1; } if((myself->socket = setup_vpn_in_socket(myself->port)) < 0) { - syslog(LOG_ERR, _("Unable to set up an incoming vpn data socket")); - close(myself->meta_socket); + syslog(LOG_ERR, _("Unable to set up a listening UDP socket!")); return -1; } +cp + /* Generate packet encryption key */ + + myself->cipher_pkttype = EVP_bf_cbc(); + + myself->cipher_pktkeylength = myself->cipher_pkttype->key_len + myself->cipher_pkttype->iv_len; + + myself->cipher_pktkey = (char *)xmalloc(myself->cipher_pktkeylength); + RAND_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength); + + if(!(cfg = get_config_val(config, config_keyexpire))) + keylifetime = 3600; + else + keylifetime = cfg->data.val; + + keyexpires = time(NULL) + keylifetime; +cp + /* Check some options */ + + if((cfg = get_config_val(config, config_indirectdata))) + { + if(cfg->data.val == stupid_true) + myself->options |= OPTION_INDIRECT; + } + + if((cfg = get_config_val(config, config_tcponly))) + { + if(cfg->data.val == stupid_true) + myself->options |= OPTION_TCPONLY; + } + /* Activate ourselves */ myself->status.active = 1; - syslog(LOG_NOTICE, _("Ready: listening on port %d"), myself->port); + syslog(LOG_NOTICE, _("Ready: listening on port %hd"), myself->port); cp return 0; } @@ -615,22 +857,31 @@ 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 } @@ -641,28 +892,46 @@ int setup_network_connections(void) { config_t const *cfg; cp - if((cfg = get_config_val(pingtimeout)) == NULL) - timeout = 5; + init_connections(); + init_subnets(); + + 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; + /* Run tinc-up script to further initialize the tap interface */ + execute_script("tinc-up"); + if(setup_myself() < 0) return -1; - if((cfg = get_config_val(upstreamip)) == NULL) + 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, _("Trying 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; } @@ -672,47 +941,45 @@ cp */ void close_network_connections(void) { - conn_list_t *p; + avl_node_t *node; + connection_t *p; cp - for(p = conn_list; p != NULL; p = p->next) + for(node = connection_tree->head; node; node = node->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 = (connection_t *)node->data; + p->status.active = 0; + terminate_connection(p); } if(myself) if(myself->status.active) { close(myself->meta_socket); - close(myself->socket); + free_connection(myself); + myself = NULL; } close(tap_fd); - destroy_conn_list(); - syslog(LOG_NOTICE, _("Terminating")); + /* Execute tinc-down script right after shutting down the interface */ + execute_script("tinc-down"); + + destroy_connection_tree(); cp return; } /* create a data (udp) socket + OBSOLETED: use only one listening socket for compatibility with non-Linux operating systems */ -int setup_vpn_connection(conn_list_t *cl) +int setup_vpn_connection(connection_t *cl) { int nfd, flags; struct sockaddr_in a; + const int one = 1; cp - if(debug_lvl > 0) + if(debug_lvl >= DEBUG_TRAFFIC) syslog(LOG_DEBUG, _("Opening UDP socket to %s"), cl->hostname); nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); @@ -722,12 +989,42 @@ cp 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) { + close(nfd); syslog(LOG_ERR, _("Connecting to %s port %d failed: %m"), cl->hostname, cl->port); return -1; @@ -736,7 +1033,9 @@ cp 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; } @@ -750,36 +1049,37 @@ cp handle an incoming tcp connect call and open a connection to it. */ -conn_list_t *create_new_connection(int sfd) +connection_t *create_new_connection(int sfd) { - conn_list_t *p; + connection_t *p; struct sockaddr_in ci; int len = sizeof(ci); cp - p = new_conn_list(); + p = new_connection(); - 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"); + close(sfd); return NULL; } - p->real_ip = ntohl(ci.sin_addr.s_addr); + p->name = unknown; + p->address = ntohl(ci.sin_addr.s_addr); p->hostname = hostlookup(ci.sin_addr.s_addr); + p->port = htons(ci.sin_port); /* This one will be overwritten later */ p->meta_socket = sfd; p->status.meta = 1; + p->buffer = xmalloc(MAXBUFSIZE); p->buflen = 0; p->last_ping_time = time(NULL); - p->want_ping = 0; - syslog(LOG_NOTICE, _("Connection from %s port %d"), + 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; } @@ -789,20 +1089,21 @@ cp */ void build_fdset(fd_set *fs) { - conn_list_t *p; + avl_node_t *node; + connection_t *p; cp FD_ZERO(fs); - for(p = conn_list; p != NULL; p = p->next) + FD_SET(myself->socket, fs); + + for(node = connection_tree->head; node; node = node->next) { + p = (connection_t *)node->data; if(p->status.meta) - FD_SET(p->meta_socket, fs); - if(p->status.dataopen) - FD_SET(p->socket, fs); + FD_SET(p->meta_socket, fs); } FD_SET(myself->meta_socket, fs); - FD_SET(myself->socket, fs); FD_SET(tap_fd, fs); cp } @@ -812,118 +1113,121 @@ cp udp socket and write it to the ethertap device after being decrypted */ -int handle_incoming_vpn_data(conn_list_t *cl) +int handle_incoming_vpn_data(void) { - real_packet_t rp; - int lenin; + vpn_packet_t pkt; int x, l = sizeof(x); - conn_list_t *f; + int lenin; + struct sockaddr_in from; + socklen_t fromlen = sizeof(from); + connection_t *cl; cp - if(getsockopt(cl->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) + if(getsockopt(myself->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__, myself->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 = recvfrom(myself->socket, (char *) &(pkt.len), MTU, 0, (struct sockaddr *)&from, &fromlen)) <= 0) { - syslog(LOG_ERR, _("Receiving packet from %s failed: %m"), cl->hostname); + 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) + cl = lookup_connection(ntohl(from.sin_addr.s_addr), ntohs(from.sin_port)); + + if(!cl) { - f = lookup_conn(rp.from); - if(!f) - { - syslog(LOG_ERR, _("Got packet from " IP_ADDR_S " (%s) with unknown origin " IP_ADDR_S "?"), - IP_ADDR_V(cl->vpn_ip), cl->hostname, 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); - } + syslog(LOG_WARNING, _("Received UDP packets on port %hd from unknown source %x:%hd"), myself->port, ntohl(from.sin_addr.s_addr), ntohs(from.sin_port)); + return 0; + } - if(my_key_expiry <= time(NULL)) - regenerate_keys(); + if(debug_lvl >= DEBUG_TRAFFIC) + { + syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), lenin, + cl->name, cl->hostname); } + cp - return 0; + return xrecv(cl, &pkt); } /* terminate a connection and notify the other end before closing the sockets */ -void terminate_connection(conn_list_t *cl) +void terminate_connection(connection_t *cl) { - conn_list_t *p, *q; - + connection_t *p; + subnet_t *subnet; + avl_node_t *node, *next; cp if(cl->status.remove) return; - if(debug_lvl > 0) - syslog(LOG_NOTICE, _("Closing connection with " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - - if(cl->status.timeout) - send_timeout(cl); - else if(!cl->status.termreq) - send_termreq(cl); - - close(cl->socket); + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Closing connection with %s (%s)"), + cl->name, cl->hostname); + + cl->status.remove = 1; + + if(cl->socket) + close(cl->socket); if(cl->status.meta) close(cl->meta_socket); - if(cl->status.outgoing) + if(cl->status.meta) + { + + /* Find all connections that were lost because they were behind cl + (the connection that was dropped). */ + + for(node = connection_tree->head; node; node = node->next) + { + p = (connection_t *)node->data; + if(p->nexthop == cl && p != cl) + terminate_connection(p); + } + + /* Inform others of termination if it was still active */ + + if(cl->status.active) + for(node = connection_tree->head; node; node = node->next) + { + p = (connection_t *)node->data; + if(p->status.meta && p->status.active && p != cl) + send_del_host(p, cl); /* Sounds like recursion, but p does not have a meta connection :) */ + } + } + + /* Remove the associated subnets */ + + for(node = cl->subnet_tree->head; node; node = next) + { + next = node->next; + subnet = (subnet_t *)node->data; + subnet_del(subnet); + } + + /* Check if this was our outgoing connection */ + + if(cl->status.outgoing && cl->status.active) { signal(SIGALRM, sigalrm_handler); seconds_till_retry = 5; alarm(seconds_till_retry); syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 seconds")); } - - cl->status.active = 0; - cl->status.remove = 1; -cp - /* Find all connections that were lost because they were behind cl - (the connection that was dropped). */ - for(p = conn_list; p != NULL; p = p->next) - if(p->nexthop == cl) - { - p->status.active = 0; - p->status.remove = 1; - } - -cp - /* Then send a notification about all these connections to all hosts - that are still connected to us. */ - for(p = conn_list; p != NULL; p = p->next) - if(!p->status.remove && p->status.meta) - for(q = conn_list; q != NULL; q = q->next) - if(q->status.remove) - send_del_host(p, q); + /* Inactivate */ + cl->status.active = 0; cp } @@ -935,59 +1239,56 @@ 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; + connection_t *cl; cp now = time(NULL); - for(p = conn_list; p != NULL; p = p->next) + + for(node = connection_tree->head; node; node = node->next) { - if(p->status.remove) - continue; - if(p->status.active && p->status.meta) - { - if(p->last_ping_time + timeout < now) + cl = (connection_t *)node->data; + if(cl->status.active && cl->status.meta) + { + if(cl->last_ping_time + timeout < now) { - if(p->status.pinged && !p->status.got_pong) + if(cl->status.pinged) { - if(debug_lvl > 1) - syslog(LOG_INFO, _(IP_ADDR_S " (%s) didn't respond to ping"), - IP_ADDR_V(p->vpn_ip), p->hostname); - p->status.timeout = 1; - terminate_connection(p); + if(debug_lvl >= DEBUG_PROTOCOL) + syslog(LOG_INFO, _("%s (%s) didn't respond to PING"), + cl->name, cl->hostname); + cl->status.timeout = 1; + terminate_connection(cl); } - else if(p->want_ping) + else { - send_ping(p); - p->last_ping_time = now; - p->status.pinged = 1; - p->status.got_pong = 0; + send_ping(cl); } } - } + } } cp - return 0; } /* 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 *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); @@ -995,105 +1296,8 @@ cp return 0; } - ncn->status.meta = 1; - ncn->next = conn_list; - conn_list = 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; + connection_add(ncn); 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(debug_lvl > 2) - syslog(LOG_DEBUG, _("Got request from " IP_ADDR_S " (%s): %s"), - IP_ADDR_V(cl->vpn_ip), cl->hostname, cl->buffer); - if(sscanf(cl->buffer, "%d", &request) == 1) - { - if((request < 0) || (request > 255) || (request_handlers[request] == NULL)) - { - syslog(LOG_ERR, _("Unknown request from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - return -1; - } - - if(request_handlers[request](cl)) /* Something went wrong. Probably scriptkiddies. Terminate. */ - { - syslog(LOG_ERR, _("Error while processing request from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - return -1; - } - } - else - { - syslog(LOG_ERR, _("Bogus data received from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - 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; } @@ -1103,43 +1307,30 @@ cp */ void check_network_activity(fd_set *f) { - conn_list_t *p; - int x, l = sizeof(x); + connection_t *p; + avl_node_t *node; cp - for(p = conn_list; p != NULL; p = p->next) + if(FD_ISSET(myself->socket, f)) + handle_incoming_vpn_data(); + + for(node = connection_tree->head; node; node = node->next) { + p = (connection_t *)node->data; + if(p->status.remove) - 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: %s"), sys_errlist[x]); - terminate_connection(p); - return; - } + 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 } @@ -1150,42 +1341,42 @@ 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 > 3) - 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 > 3) - 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]))); - - 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 } @@ -1198,6 +1389,7 @@ void main_loop(void) struct timeval tv; int r; time_t last_ping_check; + int t; cp last_ping_check = time(NULL); @@ -1206,30 +1398,69 @@ cp tv.tv_sec = timeout; tv.tv_usec = 0; - prune_conn_list(); + prune_connection_tree(); build_fdset(&fset); 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(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; } - if(last_ping_check + timeout < time(NULL)) - /* Let's check if everybody is still alive */ + 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(); + } } cp }