/* net_socket.c -- Handle various kinds of sockets. Copyright (C) 1998-2002 Ivo Timmermans , 2000-2002 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 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_socket.c,v 1.1.2.14 2002/06/08 14:08:57 guus Exp $ */ #include "config.h" #include #include #include #include #ifdef HAVE_NETINET_IN_SYSTM_H #include #endif #ifdef HAVE_NETINET_IP_H #include #endif #ifdef HAVE_NETINET_TCP_H #include #endif #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 #include #include "conf.h" #include "connection.h" #include "meta.h" #include "net.h" #include "netutl.h" #include "process.h" #include "protocol.h" #include "subnet.h" #include "graph.h" #include "process.h" #include "route.h" #include "device.h" #include "event.h" #include "system.h" #ifndef HAVE_RAND_PSEUDO_BYTES #define RAND_pseudo_bytes RAND_bytes #endif int addressfamily = AF_INET; int maxtimeout = 900; int seconds_till_retry = 5; listen_socket_t listen_socket[MAXSOCKETS]; int listen_sockets = 0; /* Setup sockets */ int setup_listen_socket(sockaddr_t *sa) { int nfd, flags; char *addrstr; int option; #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) char *interface; struct ifreq ifr; #endif cp if((nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP)) < 0) { syslog(LOG_ERR, _("Creating metasocket failed: %s"), strerror(errno)); 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: %s"), "fcntl", strerror(errno)); return -1; } /* Optimize TCP settings */ option = 1; setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option)); #if defined(SOL_TCP) && defined(TCP_NODELAY) setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); #endif #if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY) option = IPTOS_LOWDELAY; setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option)); #endif if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface)) { #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_ifrn.ifrn_name, interface, IFNAMSIZ); if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) { close(nfd); syslog(LOG_ERR, _("Can't bind to interface %s: %s"), interface, strerror(errno)); return -1; } #else syslog(LOG_WARNING, _("BindToDevice not supported on this platform")); #endif } if(bind(nfd, &sa->sa, SALEN(sa->sa))) { close(nfd); addrstr = sockaddr2hostname(sa); syslog(LOG_ERR, _("Can't bind to %s/tcp: %s"), addrstr, strerror(errno)); free(addrstr); return -1; } if(listen(nfd, 3)) { close(nfd); syslog(LOG_ERR, _("System call `%s' failed: %s"), "listen", strerror(errno)); return -1; } cp return nfd; } int setup_vpn_in_socket(sockaddr_t *sa) { int nfd, flags; char *addrstr; int option; #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) char *interface; struct ifreq ifr; #endif cp if((nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP)) < 0) { syslog(LOG_ERR, _("Creating UDP socket failed: %s"), strerror(errno)); 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: %s"), "fcntl", strerror(errno)); return -1; } option = 1; setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option)); #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface)) { memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_ifrn.ifrn_name, interface, IFNAMSIZ); if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) { close(nfd); syslog(LOG_ERR, _("Can't bind to interface %s: %s"), interface, strerror(errno)); return -1; } } #endif if(bind(nfd, &sa->sa, SALEN(sa->sa))) { close(nfd); addrstr = sockaddr2hostname(sa); syslog(LOG_ERR, _("Can't bind to %s/udp: %s"), addrstr, strerror(errno)); free(addrstr); return -1; } cp return nfd; } void retry_outgoing(outgoing_t *outgoing) { event_t *event; cp outgoing->timeout += 5; if(outgoing->timeout > maxtimeout) outgoing->timeout = maxtimeout; event = new_event(); event->handler = (event_handler_t)setup_outgoing_connection; event->time = now + outgoing->timeout; event->data = outgoing; event_add(event); if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in %d seconds"), outgoing->timeout); cp } int setup_outgoing_socket(connection_t *c) { int option; cp if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname); c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP); if(c->socket == -1) { syslog(LOG_ERR, _("Creating socket for %s failed: %s"), c->hostname, strerror(errno)); return -1; } /* Optimize TCP settings */ #if defined(SOL_TCP) && defined(TCP_NODELAY) option = 1; setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); #endif #if defined(SOL_IP) && defined(IP_TOS) option = IPTOS_LOWDELAY; setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option)); #endif /* Connect */ if(connect(c->socket, &c->address.sa, SALEN(c->address.sa)) == -1) { close(c->socket); syslog(LOG_ERR, _("Error while connecting to %s (%s): %s"), c->name, c->hostname, strerror(errno)); return -1; } if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_INFO, _("Connected to %s (%s)"), c->name, c->hostname); cp return 0; } void finish_connecting(connection_t *c) { cp if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_INFO, _("Connected to %s (%s)"), c->name, c->hostname); c->last_ping_time = now; send_id(c); cp } void do_outgoing_connection(connection_t *c) { char *address, *port; int option, result, flags; cp begin: if(!c->outgoing->ai) { if(!c->outgoing->cfg) { if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_ERR, _("Could not set up a meta connection to %s"), c->name); c->status.remove = 1; retry_outgoing(c->outgoing); return; } get_config_string(c->outgoing->cfg, &address); if(!get_config_string(lookup_config(c->config_tree, "Port"), &port)) asprintf(&port, "655"); c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM); free(address); free(port); c->outgoing->aip = c->outgoing->ai; c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg); } if(!c->outgoing->aip) { freeaddrinfo(c->outgoing->ai); c->outgoing->ai = NULL; goto begin; } memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen); c->outgoing->aip = c->outgoing->aip->ai_next; if(c->hostname) free(c->hostname); c->hostname = sockaddr2hostname(&c->address); if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname); c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP); if(c->socket == -1) { if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_ERR, _("Creating socket for %s failed: %s"), c->hostname, strerror(errno)); goto begin; } /* Optimize TCP settings */ #if defined(SOL_TCP) && defined(TCP_NODELAY) option = 1; setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); #endif #if defined(SOL_IP) && defined(IP_TOS) option = IPTOS_LOWDELAY; setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option)); #endif /* Non-blocking */ flags = fcntl(c->socket, F_GETFL); if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) { syslog(LOG_ERR, _("fcntl for %s: %s"), c->hostname, strerror(errno)); } /* Connect */ result = connect(c->socket, &c->address.sa, SALEN(c->address.sa)); if(result == -1) { if(errno == EINPROGRESS) { c->status.connecting = 1; return; } close(c->socket); if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_ERR, _("%s: %s"), c->hostname, strerror(errno)); goto begin; } finish_connecting(c); return; cp } void setup_outgoing_connection(outgoing_t *outgoing) { connection_t *c; node_t *n; cp n = lookup_node(outgoing->name); if(n) if(n->connection) { if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_INFO, _("Already connected to %s"), outgoing->name); n->connection->outgoing = outgoing; return; } c = new_connection(); c->name = xstrdup(outgoing->name); c->outcipher = myself->connection->outcipher; c->outdigest = myself->connection->outdigest; c->outmaclength = myself->connection->outmaclength; c->outcompression = myself->connection->outcompression; init_configuration(&c->config_tree); read_connection_config(c); outgoing->cfg = lookup_config(c->config_tree, "Address"); if(!outgoing->cfg) { syslog(LOG_ERR, _("No address specified for %s"), c->name); free_connection(c); free(outgoing->name); free(outgoing); return; } c->outgoing = outgoing; c->last_ping_time = now; connection_add(c); do_outgoing_connection(c); } /* accept a new tcp connect and create a new connection */ int handle_new_meta_connection(int sock) { connection_t *c; sockaddr_t sa; int fd, len = sizeof(sa); cp if((fd = accept(sock, &sa.sa, &len)) < 0) { syslog(LOG_ERR, _("Accepting a new connection failed: %s"), strerror(errno)); return -1; } sockaddrunmap(&sa); c = new_connection(); c->outcipher = myself->connection->outcipher; c->outdigest = myself->connection->outdigest; c->outmaclength = myself->connection->outmaclength; c->outcompression = myself->connection->outcompression; c->address = sa; c->hostname = sockaddr2hostname(&sa); c->socket = fd; c->last_ping_time = now; if(debug_lvl >= DEBUG_CONNECTIONS) syslog(LOG_NOTICE, _("Connection from %s"), c->hostname); connection_add(c); c->allow_request = ID; send_id(c); cp return 0; } void try_outgoing_connections(void) { static config_t *cfg = NULL; char *name; outgoing_t *outgoing; cp for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) { get_config_string(cfg, &name); if(check_id(name)) { syslog(LOG_ERR, _("Invalid name for outgoing connection in %s line %d"), cfg->file, cfg->line); free(name); continue; } outgoing = xmalloc_and_zero(sizeof(*outgoing)); outgoing->name = name; setup_outgoing_connection(outgoing); } }