X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet.c;h=7d780608d6f9b64d276fd407355c938629fd5b35;hp=dce4ae4fcf27038fbf4bd8af3228faec87d03f08;hb=9acd4379f705edc8b736e21b9011434e63f7dd95;hpb=42455e97a057fb4386f9d8fb2f8963b2ec6ddf24 diff --git a/src/net.c b/src/net.c index dce4ae4f..7d780608 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 1.35.4.20 2000/07/02 13:40:57 guus Exp $ + $Id: net.c,v 1.35.4.26 2000/08/09 14:02:16 guus Exp $ */ #include "config.h" @@ -95,7 +95,6 @@ cp int xsend(conn_list_t *cl, void *packet) { - int r; real_packet_t rp; cp do_encrypt((vpn_packet_t*)packet, &rp, cl->key); @@ -107,16 +106,19 @@ cp syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"), ntohs(rp.len), cl->vpn_hostname, cl->real_hostname); - if((r = send(cl->socket, (char*)&rp, ntohs(rp.len), 0)) < 0) + total_socket_out += ntohs(rp.len); + + cl->want_ping = 1; + + if((cl->flags | myself->flags) & TCPONLY) + return send_tcppacket(cl, (void*)&rp, ntohs(rp.len)); + + if((send(cl->socket, (char*)&rp, ntohs(rp.len), 0)) < 0) { syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"), cl->vpn_hostname, cl->real_hostname); return -1; } - - total_socket_out += r; - - cl->want_ping = 1; cp return 0; } @@ -144,6 +146,59 @@ cp return 0; } +int tcprecv(conn_list_t *cl, real_packet_t *rp) +{ + vpn_packet_t vp; + int lenin; + conn_list_t *f; +cp + rp->data.len = ntohs(rp->data.len); + rp->len = ntohs(rp->len); + rp->from = ntohl(rp->from); + + total_socket_in += rp->len; + + if(rp->len >= 0) + { + f = lookup_conn(rp->from); + if(!f) + { + syslog(LOG_ERR, _("Got packet from %s (%s) with unknown origin %d.%d.%d.%d?"), + cl->vpn_hostname, cl->real_hostname, IP_ADDR_V(rp->from)); + return -1; + } + + if(f->status.validkey) + { + do_decrypt(rp, &vp, cl->key); + add_mac_addresses(&vp); + + if(debug_lvl > 3) + syslog(LOG_ERR, _("Receiving packet of %d bytes from %s (%s)"), + rp->len, cl->vpn_hostname, cl->real_hostname); + + 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; + } + else + { + add_queue(&(cl->sq), rp, rp->len + 2); + if(!cl->status.waitingforkey) + send_key_request(rp->from); + } + + if(my_key_expiry <= time(NULL)) + regenerate_keys(); + } + + 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 @@ -405,6 +460,7 @@ 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) { @@ -418,6 +474,12 @@ cp return -1; } + if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one))) + { + syslog(LOG_ERR, _("setsockopt: %m")); + return -1; + } + flags = fcntl(nfd, F_GETFL); if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) { @@ -425,10 +487,23 @@ cp return -1; } + if((cfg = get_config_val(interface))) + { + if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, cfg->data.ptr, strlen(cfg->data.ptr))) + { + syslog(LOG_ERR, _("Unable to bind listen socket to interface %s: %m"), cfg->data.ptr); + return -1; + } + } + memset(&a, 0, sizeof(a)); a.sin_family = AF_INET; a.sin_port = htons(port); - a.sin_addr.s_addr = htonl(INADDR_ANY); + + if((cfg = get_config_val(interfaceip))) + a.sin_addr.s_addr = htonl(cfg->data.ip->ip); + else + a.sin_addr.s_addr = htonl(INADDR_ANY); if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr))) { @@ -602,10 +677,14 @@ cp else myself->port = cfg->data.val; - if(cfg = get_config_val(indirectdata)) + if((cfg = get_config_val(indirectdata))) if(cfg->data.val == stupid_true) myself->flags |= EXPORTINDIRECTDATA; + if((cfg = get_config_val(tcponly))) + if(cfg->data.val == stupid_true) + myself->flags |= TCPONLY; + if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0) { syslog(LOG_ERR, _("Unable to set up a listening socket")); @@ -904,7 +983,7 @@ cp */ void terminate_connection(conn_list_t *cl) { - conn_list_t *p, *q; + conn_list_t *p; cp if(cl->status.remove) @@ -1063,16 +1142,18 @@ cp return -1; } - lenin = read(cl->meta_socket, cl->buffer, MAXBUFSIZE-cl->buflen); + lenin = read(cl->meta_socket, cl->buffer, MAXBUFSIZE - cl->buflen); if(lenin<=0) { if(errno==EINTR) return 0; if(errno==0) - if(debug_lvl>0) - syslog(LOG_NOTICE, _("Connection closed by %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + { + if(debug_lvl>0) + syslog(LOG_NOTICE, _("Connection closed by %s (%s)"), + cl->vpn_hostname, cl->real_hostname); + } else syslog(LOG_ERR, _("Metadata socket read error for %s (%s): %m"), cl->vpn_hostname, cl->real_hostname); @@ -1084,53 +1165,71 @@ cp for(;;) { - cl->reqlen = 0; - - for(i = oldlen; i < cl->buflen; i++) + if(cl->tcppacket) { - if(cl->buffer[i] == '\n') + if(cl->buflen >= cl->tcppacket) + { + tcprecv(cl, (real_packet_t *)cl->buffer); + cl->buflen -= cl->tcppacket; + memmove(cl->buffer, cl->buffer + cl->tcppacket, cl->buflen); + oldlen = 0; + cl->tcppacket=0; + } + else { - 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) + else { - if(debug_lvl > 2) - syslog(LOG_DEBUG, _("Got request from %s (%s): %s"), - cl->vpn_hostname, cl->real_hostname, cl->buffer); - if(sscanf(cl->buffer, "%d", &request) == 1) + cl->reqlen = 0; + + for(i = oldlen; i < cl->buflen; i++) { - if((request < 0) || (request > 255) || (request_handlers[request] == NULL)) + if(cl->buffer[i] == '\n') { - syslog(LOG_ERR, _("Unknown request from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; + cl->buffer[i] = 0; /* replace end-of-line by end-of-string so we can use sscanf */ + cl->reqlen = i + 1; + break; } + } - if(request_handlers[request](cl)) /* Something went wrong. Probably scriptkiddies. Terminate. */ + if(cl->reqlen) + { + if(debug_lvl > 2) + syslog(LOG_DEBUG, _("Got request from %s (%s): %s"), + cl->vpn_hostname, cl->real_hostname, cl->buffer); + if(sscanf(cl->buffer, "%d", &request) == 1) { - syslog(LOG_ERR, _("Error while processing request from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + if((request < 0) || (request > 255) || (request_handlers[request] == NULL)) + { + syslog(LOG_ERR, _("Unknown request from %s (%s)"), + cl->vpn_hostname, cl->real_hostname); + return -1; + } + + if(request_handlers[request](cl)) /* Something went wrong. Probably scriptkiddies. Terminate. */ + { + syslog(LOG_ERR, _("Error while processing request from %s (%s)"), + cl->vpn_hostname, cl->real_hostname); + return -1; + } + } + else + { + syslog(LOG_ERR, _("Bogus data received from %s (%s)"), + cl->vpn_hostname, cl->real_hostname); return -1; } + + cl->buflen -= cl->reqlen; + memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen); + oldlen = 0; } else { - syslog(LOG_ERR, _("Bogus data received from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; + break; } - - cl->buflen -= cl->reqlen; - memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen); - oldlen = 0; - } - else - { - break; } }