--- /dev/null
+/*
+ net_socket.c -- Handle various kinds of sockets.
+ Copyright (C) 1998-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
+ 2000-2002 Guus Sliepen <guus@sliepen.warande.net>
+
+ 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 2002/04/28 12:46:26 zarq Exp $
+*/
+
+#include "config.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#ifdef HAVE_LINUX
+ #include <netinet/ip.h>
+ #include <netinet/tcp.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+/* SunOS really wants sys/socket.h BEFORE net/if.h,
+ and FreeBSD wants these lines below the rest. */
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <net/if.h>
+
+#include <utils.h>
+#include <xalloc.h>
+#include <avl_tree.h>
+#include <list.h>
+
+#include "conf.h"
+#include "interface.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 "logging.h"
+
+#include "system.h"
+
+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)
+ {
+ log(0, TLOG_ERROR,
+ _("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 */
+
+#ifdef HAVE_LINUX
+ option = 1;
+ setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
+
+ 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)
+ {
+ log(DEBUG_CONNECTIONS, TLOG_ERROR,
+ _("Could not set up a meta connection to %s"),
+ c->name);
+ c->status.remove = 1;
+ do_prune = 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 */
+
+#ifdef HAVE_LINUX
+ option = 1;
+ setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
+
+ 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)
+ {
+ log(DEBUG_CONNECTIONS, TLOG_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;
+
+ log(DEBUG_CONNECTIONS, TLOG_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);
+ }
+}
projects / tinc / blobdiff