tinc/src/net_socket.c

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/*
net_socket.c -- Handle various kinds of sockets.
Copyright (C) 1998-2005 Ivo Timmermans,
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2000-2008 Guus Sliepen <guus@tinc-vpn.org>
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.
$Id$
*/
#include "system.h"
#include "avl_tree.h"
#include "conf.h"
#include "connection.h"
#include "event.h"
#include "logger.h"
#include "meta.h"
#include "net.h"
#include "netutl.h"
#include "protocol.h"
#include "utils.h"
#include "xalloc.h"
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#ifdef WSAEINPROGRESS
#define EINPROGRESS WSAEINPROGRESS
#endif
/* Needed on Mac OS/X */
#ifndef SOL_TCP
#define SOL_TCP IPPROTO_TCP
#endif
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int addressfamily = AF_UNSPEC;
int maxtimeout = 900;
int seconds_till_retry = 5;
listen_socket_t listen_socket[MAXSOCKETS];
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int listen_sockets;
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/* Setup sockets */
static void configure_tcp(connection_t *c)
{
int option;
#ifdef O_NONBLOCK
int flags = fcntl(c->socket, F_GETFL);
if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
logger(LOG_ERR, _("fcntl for %s: %s"), c->hostname, strerror(errno));
}
#elif defined(WIN32)
unsigned long arg = 1;
if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
logger(LOG_ERR, _("ioctlsocket for %s: WSA error %d"), c->hostname, WSAGetLastError());
}
#endif
#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) && defined(IPTOS_LOWDELAY)
option = IPTOS_LOWDELAY;
setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option));
#endif
}
int setup_listen_socket(const sockaddr_t *sa)
{
int nfd;
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char *addrstr;
int option;
char *iface;
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cp();
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nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
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if(nfd < 0) {
ifdebug(STATUS) logger(LOG_ERR, _("Creating metasocket failed: %s"), strerror(errno));
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return -1;
}
/* Optimize TCP settings */
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option = 1;
setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
if(sa->sa.sa_family == AF_INET6)
setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
#endif
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if(get_config_string
(lookup_config(config_tree, "BindToInterface"), &iface)) {
#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
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if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) {
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closesocket(nfd);
logger(LOG_ERR, _("Can't bind to interface %s: %s"), iface,
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strerror(errno));
return -1;
}
#else
logger(LOG_WARNING, _("BindToInterface not supported on this platform"));
#endif
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}
if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
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closesocket(nfd);
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addrstr = sockaddr2hostname(sa);
logger(LOG_ERR, _("Can't bind to %s/tcp: %s"), addrstr,
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strerror(errno));
free(addrstr);
return -1;
}
if(listen(nfd, 3)) {
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closesocket(nfd);
logger(LOG_ERR, _("System call `%s' failed: %s"), "listen",
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strerror(errno));
return -1;
}
return nfd;
}
int setup_vpn_in_socket(const sockaddr_t *sa)
{
int nfd;
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char *addrstr;
int option;
cp();
nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
if(nfd < 0) {
logger(LOG_ERR, _("Creating UDP socket failed: %s"), strerror(errno));
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return -1;
}
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#ifdef O_NONBLOCK
{
int flags = fcntl(nfd, F_GETFL);
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
closesocket(nfd);
logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl",
strerror(errno));
return -1;
}
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}
#elif defined(WIN32)
{
unsigned long arg = 1;
if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
closesocket(nfd);
logger(LOG_ERR, _("Call to `%s' failed: WSA error %d"), "ioctlsocket",
WSAGetLastError());
return -1;
}
}
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#endif
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option = 1;
setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
if(sa->sa.sa_family == AF_INET6)
setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
#endif
#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
{
bool choice;
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if(!get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) || choice) {
option = IP_PMTUDISC_DO;
setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, &option, sizeof(option));
}
}
#endif
#if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
{
bool choice;
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if(!get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) || choice) {
option = IPV6_PMTUDISC_DO;
setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, &option, sizeof(option));
}
}
#endif
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#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
{
char *iface;
struct ifreq ifr;
if(get_config_string(lookup_config(config_tree, "BindToInterface"), &iface)) {
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) {
closesocket(nfd);
logger(LOG_ERR, _("Can't bind to interface %s: %s"), iface,
strerror(errno));
return -1;
}
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}
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}
#endif
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if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
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closesocket(nfd);
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addrstr = sockaddr2hostname(sa);
logger(LOG_ERR, _("Can't bind to %s/udp: %s"), addrstr,
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strerror(errno));
free(addrstr);
return -1;
}
return nfd;
}
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void retry_outgoing(outgoing_t *outgoing)
{
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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);
ifdebug(CONNECTIONS) logger(LOG_NOTICE,
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_("Trying to re-establish outgoing connection in %d seconds"),
outgoing->timeout);
}
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void finish_connecting(connection_t *c)
{
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cp();
ifdebug(CONNECTIONS) logger(LOG_INFO, _("Connected to %s (%s)"), c->name, c->hostname);
configure_tcp(c);
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c->last_ping_time = now;
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send_id(c);
}
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void do_outgoing_connection(connection_t *c)
{
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char *address, *port;
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int result;
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cp();
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begin:
if(!c->outgoing->ai) {
if(!c->outgoing->cfg) {
ifdebug(CONNECTIONS) logger(LOG_ERR, _("Could not set up a meta connection to %s"),
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c->name);
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c->status.remove = true;
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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);
}
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if(!c->outgoing->aip) {
if(c->outgoing->ai)
freeaddrinfo(c->outgoing->ai);
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c->outgoing->ai = NULL;
goto begin;
}
memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen);
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c->outgoing->aip = c->outgoing->aip->ai_next;
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if(c->hostname)
free(c->hostname);
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c->hostname = sockaddr2hostname(&c->address);
ifdebug(CONNECTIONS) logger(LOG_INFO, _("Trying to connect to %s (%s)"), c->name,
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c->hostname);
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c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
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if(c->socket == -1) {
ifdebug(CONNECTIONS) logger(LOG_ERR, _("Creating socket for %s failed: %s"), c->hostname,
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strerror(errno));
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goto begin;
}
#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
int option = 1;
if(c->address.sa.sa_family == AF_INET6)
setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
#endif
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/* Optimize TCP settings */
configure_tcp(c);
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/* Connect */
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result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
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if(result == -1) {
if(errno == EINPROGRESS
#if defined(WIN32) && !defined(O_NONBLOCK)
|| WSAGetLastError() == WSAEWOULDBLOCK
#endif
) {
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c->status.connecting = true;
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return;
}
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closesocket(c->socket);
ifdebug(CONNECTIONS) logger(LOG_ERR, _("%s: %s"), c->hostname, strerror(errno));
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goto begin;
}
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finish_connecting(c);
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return;
}
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void setup_outgoing_connection(outgoing_t *outgoing)
{
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connection_t *c;
node_t *n;
cp();
n = lookup_node(outgoing->name);
if(n)
if(n->connection) {
ifdebug(CONNECTIONS) logger(LOG_INFO, _("Already connected to %s"), outgoing->name);
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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) {
logger(LOG_ERR, _("No address specified for %s"), c->name);
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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
*/
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bool handle_new_meta_connection(int sock)
{
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connection_t *c;
sockaddr_t sa;
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int fd;
socklen_t len = sizeof(sa);
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cp();
fd = accept(sock, &sa.sa, &len);
if(fd < 0) {
logger(LOG_ERR, _("Accepting a new connection failed: %s"),
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strerror(errno));
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return false;
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}
sockaddrunmap(&sa);
c = new_connection();
c->name = xstrdup("<unknown>");
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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;
ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection from %s"), c->hostname);
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configure_tcp(c);
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connection_add(c);
c->allow_request = ID;
send_id(c);
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return true;
}
void try_outgoing_connections(void)
{
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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)) {
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get_config_string(cfg, &name);
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if(!check_id(name)) {
logger(LOG_ERR,
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_("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);
}
}