X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet.c;h=32c66e8781054fdf07edaae72c28889eaad833b9;hp=59725cadcfa85abf5a4ba73de90dc83d8c8ae1cd;hb=3b9802a542f1fa439321d3386763ec33989194b5;hpb=183a8edd22ba4bc682392c73ae02fc9e121eda68 diff --git a/src/net.c b/src/net.c index 59725cad..32c66e87 100644 --- a/src/net.c +++ b/src/net.c @@ -17,7 +17,7 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: net.c,v 1.35.4.34 2000/10/11 22:00:58 guus Exp $ + $Id: net.c,v 1.35.4.51 2000/10/29 00:46:43 guus Exp $ */ #include "config.h" @@ -25,6 +25,8 @@ #include #include #include +#include +#include #include #include #include @@ -36,6 +38,11 @@ #include #include #include +#include + +#ifdef HAVE_TUNTAP +#include LINUX_IF_TUN_H +#endif #include #include @@ -46,22 +53,24 @@ #include "netutl.h" #include "protocol.h" #include "meta.h" +#include "connlist.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; -int upstreamindex = 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; +char *unknown = NULL; + +subnet_t mymac; /* strip off the MAC adresses of an ethernet frame @@ -95,12 +104,18 @@ int xsend(conn_list_t *cl, vpn_packet_t *inpkt) int outlen, outpad; cp outpkt.len = inpkt->len; - EVP_EncryptInit(cl->cipher_pktctx, cl->cipher_pkttype, cl->cipher_pktkey, cl->cipher_pktiv); +/* + 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; + outlen += outpad + 2; + + Do encryption when everything else is fixed... +*/ + outlen = outpkt.len + 2; + memcpy(&outpkt, inpkt, outlen); - if(debug_lvl > 3) + if(debug_lvl >= DEBUG_TRAFFIC) syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), outlen, cl->name, cl->hostname); @@ -108,7 +123,7 @@ cp cl->want_ping = 1; - if((send(cl->socket, (char *) &(outpkt.len), outlen + 2, 0)) < 0) + if((send(cl->socket, (char *) &(outpkt.len), outlen, 0)) < 0) { syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"), cl->name, cl->hostname); @@ -123,23 +138,36 @@ int xrecv(vpn_packet_t *inpkt) 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, myself->cipher_pktiv); +/* + 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); + outlen += outpad; - 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; + Do decryption is everything else is fixed... +*/ + outlen = outpkt.len+2; + memcpy(&outpkt, inpkt, outlen); + + /* Fix mac address */ + + memcpy(outpkt.data, mymac.net.mac.address.x, 6); + + if(taptype == TAP_TYPE_TUNTAP) + { + if(write(tap_fd, outpkt.data, outpkt.len) < 0) + syslog(LOG_ERR, _("Can't write to tun/tap device: %m")); + else + total_tap_out += outpkt.len; + } + else /* ethertap */ + { + if(write(tap_fd, outpkt.data - 2, outpkt.len + 2) < 0) + syslog(LOG_ERR, _("Can't write to ethertap device: %m")); + else + total_tap_out += outpkt.len + 2; + } cp return 0; } @@ -236,7 +264,7 @@ cp p = next; } - if(debug_lvl > 3) + if(debug_lvl >= DEBUG_TRAFFIC) syslog(LOG_DEBUG, _("Queue flushed")); cp } @@ -251,7 +279,7 @@ void flush_queues(conn_list_t *cl) cp if(cl->sq) { - if(debug_lvl > 3) + if(debug_lvl >= DEBUG_TRAFFIC) syslog(LOG_DEBUG, _("Flushing send queue for %s (%s)"), cl->name, cl->hostname); flush_queue(cl, &(cl->sq), xsend); @@ -259,7 +287,7 @@ cp if(cl->rq) { - if(debug_lvl > 3) + if(debug_lvl >= DEBUG_TRAFFIC) syslog(LOG_DEBUG, _("Flushing receive queue for %s (%s)"), cl->name, cl->hostname); flush_queue(cl, &(cl->rq), xrecv); @@ -273,10 +301,11 @@ cp int send_packet(ip_t to, vpn_packet_t *packet) { conn_list_t *cl; + subnet_t *subnet; cp - if((cl = lookup_conn_list_ipv4(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 %d.%d.%d.%d in connection list failed!"), IP_ADDR_V(to)); @@ -284,14 +313,13 @@ cp return -1; } + + cl = subnet->owner; /* 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(my_key_expiry <= time(NULL)) - regenerate_keys(); - if(!cl->status.dataopen) if(setup_vpn_connection(cl) < 0) { @@ -302,10 +330,12 @@ cp if(!cl->status.validkey) { - if(debug_lvl > 3) +/* Don't queue until everything else is fixed. + if(debug_lvl >= DEBUG_TRAFFIC) syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"), cl->name, cl->hostname); add_queue(&(cl->sq), packet, packet->len + 2); +*/ if(!cl->status.waitingforkey) send_req_key(myself, cl); /* Keys should be sent to the host running the tincd */ return 0; @@ -313,10 +343,12 @@ cp if(!cl->status.active) { - if(debug_lvl > 3) +/* Don't queue until everything else is fixed. + if(debug_lvl >= DEBUG_TRAFFIC) syslog(LOG_INFO, _("%s (%s) is not ready, queueing packet"), cl->name, cl->hostname); add_queue(&(cl->sq), packet, packet->len + 2); +*/ return 0; /* We don't want to mess up, do we? */ } @@ -333,19 +365,60 @@ int setup_tap_fd(void) int nfd; const char *tapfname; config_t const *cfg; + char *envvar; + struct ifreq ifr; + cp - if((cfg = get_config_val(config, tapdevice)) == NULL) - tapfname = "/dev/tap0"; - else + 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; } - +cp tap_fd = nfd; + + /* Set default MAC address for ethertap devices */ + + taptype = TAP_TYPE_ETHERTAP; + mymac.type = SUBNET_MAC; + mymac.net.mac.address.x[0] = 0xfe; + mymac.net.mac.address.x[1] = 0xfd; + mymac.net.mac.address.x[2] = 0x00; + mymac.net.mac.address.x[3] = 0x00; + mymac.net.mac.address.x[4] = 0x00; + mymac.net.mac.address.x[5] = 0x00; + +#ifdef HAVE_TUNTAP + /* Ok now check if this is an old ethertap or a new tun/tap thingie */ + memset(&ifr, 0, sizeof(ifr)); +cp + ifr.ifr_flags = IFF_TAP | IFF_NO_PI; + if (netname) + strncpy(ifr.ifr_name, netname, IFNAMSIZ); +cp + if (!ioctl(tap_fd, TUNSETIFF, (void *) &ifr)) + { + syslog(LOG_INFO, _("%s is a new style tun/tap device"), tapfname); + taptype = TAP_TYPE_TUNTAP; + } +#endif + + /* Add name of network interface to environment (for scripts) */ + + ioctl(tap_fd, SIOCGIFNAME, (void *) &ifr); + asprintf(&envvar, "IFNAME=%s", ifr.ifr_name); + putenv(envvar); + free(envvar); + cp return 0; } @@ -400,7 +473,7 @@ cp a.sin_port = htons(port); if((cfg = get_config_val(config, interfaceip))) - a.sin_addr.s_addr = htonl(cfg->data.ip->ip); + a.sin_addr.s_addr = htonl(cfg->data.ip->address); else a.sin_addr.s_addr = htonl(INADDR_ANY); @@ -471,7 +544,7 @@ int setup_outgoing_meta_socket(conn_list_t *cl) struct sockaddr_in a; config_t const *cfg; cp - if(debug_lvl > 0) + if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_INFO, _("Trying to connect to %s"), cl->hostname); if((cfg = get_config_val(cl->config, port)) == NULL) @@ -505,9 +578,11 @@ cp return -1; } - if(debug_lvl > 0) + if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_INFO, _("Connected to %s port %hd"), cl->hostname, cl->port); + + cl->status.meta = 1; cp return 0; } @@ -519,18 +594,42 @@ cp an authentication sequence during which we will do just that. */ -int setup_outgoing_connection(char *hostname) +int setup_outgoing_connection(char *name) { conn_list_t *ncn; struct hostent *h; + config_t *cfg; cp - if(!(h = gethostbyname(hostname))) + if(check_id(name)) { - syslog(LOG_ERR, _("Error looking up `%s': %m"), hostname); + syslog(LOG_ERR, _("Invalid name for outgoing connection")); return -1; } 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; + } + ncn->address = ntohl(*((ip_t*)(h->h_addr_list[0]))); ncn->hostname = hostlookup(htonl(ncn->address)); @@ -538,29 +637,36 @@ cp { syslog(LOG_ERR, _("Could not set up a meta connection to %s"), ncn->hostname); - free_conn_element(ncn); + free_conn_list(ncn); return -1; } - ncn->status.meta = 1; ncn->status.outgoing = 1; - ncn->next = conn_list; - conn_list = ncn; + ncn->buffer = xmalloc(MAXBUFSIZE); + ncn->buflen = 0; + ncn->last_ping_time = time(NULL); + ncn->want_ping = 0; + + conn_list_add(ncn); + + send_id(ncn); cp return 0; } /* - set up the local sockets (listen only) + Configure conn_list_t myself and set up the local sockets (listen only) */ int setup_myself(void) { config_t const *cfg; + subnet_t *net; cp myself = new_conn_list(); - myself->hostname = "MYSELF"; /* FIXME? */ + 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 */ { @@ -568,30 +674,90 @@ cp return -1; } else - myself->name = (char*)cfg->data.val; - - if(!(cfg = get_config_val(myself, port))) + asprintf(&myself->name, "%s", (char*)cfg->data.val); + + if(check_id(myself->name)) + { + syslog(LOG_ERR, _("Invalid name for myself!")); + return -1; + } +cp + if(!(cfg = get_config_val(config, privatekey))) + { + syslog(LOG_ERR, _("Private key for tinc daemon required!")); + return -1; + } + else + { + myself->rsa_key = RSA_new(); + BN_hex2bn(&myself->rsa_key->d, cfg->data.ptr); + BN_hex2bn(&myself->rsa_key->e, "FFFF"); + } + + if(read_host_config(myself)) + { + syslog(LOG_ERR, _("Cannot open host configuration file for myself!")); + return -1; + } +cp + if(!(cfg = get_config_val(myself->config, publickey))) + { + syslog(LOG_ERR, _("Public key for tinc daemon required!")); + return -1; + } + else + { + BN_hex2bn(&myself->rsa_key->n, cfg->data.ptr); + } +/* + if(RSA_check_key(myself->rsa_key) != 1) + { + syslog(LOG_ERR, _("Invalid public/private keypair!")); + return -1; + } +*/ + if(!(cfg = get_config_val(myself->config, port))) myself->port = 655; else myself->port = cfg->data.val; - if((cfg = get_config_val(config, indirectdata))) + if((cfg = get_config_val(myself->config, indirectdata))) if(cfg->data.val == stupid_true) myself->flags |= EXPORTINDIRECTDATA; - if((cfg = get_config_val(config, tcponly))) + if((cfg = get_config_val(myself->config, tcponly))) if(cfg->data.val == stupid_true) myself->flags |= TCPONLY; +/* Read in all the subnets specified in the host configuration file */ + + for(cfg = myself->config; (cfg = get_config_val(cfg, subnet)); cfg = 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 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")); + syslog(LOG_ERR, _("Unable to set up an incoming vpn data socket!")); close(myself->meta_socket); return -1; } @@ -608,21 +774,25 @@ sigalrm_handler(int a) { config_t const *cfg; cp -/* FIXME! Use name instead of upstreamip. - cfg = get_next_config_val(config, upstreamip, upstreamindex++); -*/ + cfg = get_config_val(upstreamcfg, connectto); + + if(!cfg && upstreamcfg == config) + /* No upstream IP given, we're listen only. */ + return; + while(cfg) { + upstreamcfg = cfg->next; if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */ { signal(SIGALRM, SIG_IGN); return; } -// cfg = get_next_config_val(config, upstreamip, upstreamindex++); /* Or else we try the next ConnectTo line */ + cfg = get_config_val(upstreamcfg, connectto); /* Or else we try the next ConnectTo line */ } signal(SIGALRM, sigalrm_handler); - upstreamindex = 0; + upstreamcfg = config; seconds_till_retry += 5; if(seconds_till_retry > MAXTIMEOUT) /* Don't wait more than MAXTIMEOUT seconds. */ seconds_till_retry = MAXTIMEOUT; @@ -638,6 +808,7 @@ cp int setup_network_connections(void) { config_t const *cfg; + char *scriptname; cp if((cfg = get_config_val(config, pingtimeout)) == NULL) timeout = 5; @@ -650,19 +821,37 @@ cp if(setup_myself() < 0) return -1; -// if((cfg = get_next_config_val(config, upstreamip, upstreamindex++)) == NULL) + /* Run tinc-up script to further initialize the tap interface */ + + asprintf(&scriptname, "%s/tinc-up", confbase); + + if(!fork()) + { + + execl(scriptname, NULL); + + if(errno != ENOENT) + syslog(LOG_WARNING, _("Error while executing %s: %m"), scriptname); + + exit(0); + } + + free(scriptname); + + if(!(cfg = get_config_val(config, connectto))) /* No upstream IP given, we're listen only. */ return 0; while(cfg) { + upstreamcfg = cfg->next; if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */ return 0; -// cfg = get_next_config_val(config, upstreamip, upstreamindex++); /* Or else we try the next ConnectTo line */ + cfg = get_config_val(upstreamcfg, connectto); /* Or else we try the next ConnectTo line */ } signal(SIGALRM, sigalrm_handler); - upstreamindex = 0; + 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); @@ -676,6 +865,7 @@ cp void close_network_connections(void) { conn_list_t *p; + char *scriptname; cp for(p = conn_list; p != NULL; p = p->next) { @@ -686,7 +876,6 @@ cp } if(p->status.meta) { - send_termreq(p); shutdown(p->meta_socket, 0); /* No more receptions */ close(p->meta_socket); } @@ -699,6 +888,22 @@ cp close(myself->socket); } + /* Execute tinc-down script right before shutting down the interface */ + + asprintf(&scriptname, "%s/tinc-down", confbase); + + if(!fork()) + { + execl(scriptname, NULL); + + if(errno != ENOENT) + syslog(LOG_WARNING, _("Error while executing %s: %m"), scriptname); + + exit(0); + } + + free(scriptname); + close(tap_fd); destroy_conn_list(); @@ -715,7 +920,7 @@ int setup_vpn_connection(conn_list_t *cl) int nfd, flags; struct sockaddr_in a; 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); @@ -768,23 +973,21 @@ cp return NULL; } + 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) + 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_conn_element(p); - return NULL; - } + p->allow_request = ID; cp return p; } @@ -820,8 +1023,9 @@ cp int handle_incoming_vpn_data() { vpn_packet_t pkt; - int lenin; int x, l = sizeof(x); + struct sockaddr from; + socklen_t fromlen = sizeof(from); cp if(getsockopt(myself->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) { @@ -835,12 +1039,18 @@ cp return -1; } - if(recvfrom(myself->socket, (char *) &(pkt.len), MTU, 0, NULL, NULL) <= 0) + if(recvfrom(myself->socket, (char *) &(pkt.len), MTU, 0, &from, &fromlen) <= 0) { syslog(LOG_ERR, _("Receiving packet failed: %m")); return -1; } - +/* + if(debug_lvl >= DEBUG_TRAFFIC) + { + syslog(LOG_DEBUG, _("Received packet of %d bytes from %d.%d.%d.%d"), pkt.len, + from.sa_addr[0], from.sa_addr[1], from.sa_addr[2], from.sa_addr[3]); + } +*/ cp return xrecv(&pkt); } @@ -852,51 +1062,51 @@ cp void terminate_connection(conn_list_t *cl) { conn_list_t *p; - + subnet_t *s; cp if(cl->status.remove) - return; + { + return; + } + + cl->status.remove = 1; - if(debug_lvl > 0) + if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_NOTICE, _("Closing connection with %s (%s)"), cl->name, cl->hostname); - - if(cl->status.timeout) - send_timeout(cl); -/* else if(!cl->status.termreq) - send_termreq(cl); - */ 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. */ - 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) - notify_others(p,cl,send_del_host); - if(cl->socket) - close(cl->socket); - p->status.active = 0; - p->status.remove = 1; - } - } - + if((p->nexthop == cl) && (p != cl)) + terminate_connection(p); /* Sounds like recursion, but p does not have a meta connection :) */ + + /* Inform others of termination if it was still active */ + + if(cl->status.active) + for(p = conn_list; p != NULL; p = p->next) + if(p->status.meta && p->status.active && p!=cl) + send_del_host(p, cl); + + /* Remove the associated subnets */ + + for(s = cl->subnets; s; s = s->next) + subnet_del(s); + + /* Inactivate */ + cl->status.active = 0; - + + /* Check if this was our outgoing connection */ + if(cl->status.outgoing) { signal(SIGALRM, sigalrm_handler); @@ -923,15 +1133,13 @@ cp now = time(NULL); for(p = conn_list; p != NULL; p = p->next) { - if(p->status.remove) - continue; if(p->status.active && p->status.meta) { if(p->last_ping_time + timeout < now) { if(p->status.pinged && !p->status.got_pong) { - if(debug_lvl > 1) + if(debug_lvl >= DEBUG_PROTOCOL) syslog(LOG_INFO, _("%s (%s) didn't respond to PING"), p->name, p->hostname); p->status.timeout = 1; @@ -975,9 +1183,7 @@ cp return 0; } - ncn->status.meta = 1; - ncn->next = conn_list; - conn_list = ncn; + conn_list_add(ncn); cp return 0; } @@ -1036,41 +1242,42 @@ 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 %02x:%02x:%02x:%02x:%02x:%02x"), ether_type, MAC_ADDR_V(vp.data[6])); - return; - } - 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])); + 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 } @@ -1106,6 +1313,7 @@ cp if(sighup) { sighup = 0; +/* FIXME: reprogram this. if(debug_lvl > 1) syslog(LOG_INFO, _("Rereading configuration file")); close_network_connections(); @@ -1117,6 +1325,7 @@ cp } sleep(5); setup_network_connections(); +*/ continue; }