/*
net_socket.c -- Handle various kinds of sockets.
Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2008 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2010 Guus Sliepen <guus@tinc-vpn.org>
+ 2006 Scott Lamb <slamb@slamb.org>
+ 2009 Florian Forster <octo@verplant.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
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.
-
- $Id$
+ 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.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
#include "utils.h"
#include "xalloc.h"
-#ifdef WSAEINPROGRESS
-#define EINPROGRESS WSAEINPROGRESS
-#endif
+#include <assert.h>
/* Needed on Mac OS/X */
#ifndef SOL_TCP
int addressfamily = AF_UNSPEC;
int maxtimeout = 900;
int seconds_till_retry = 5;
+int udp_rcvbuf = 0;
+int udp_sndbuf = 0;
listen_socket_t listen_socket[MAXSOCKETS];
int listen_sockets;
/* Setup sockets */
-static void configure_tcp(connection_t *c)
-{
+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));
+ 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());
+ logger(LOG_ERR, "ioctlsocket for %s: %d", c->hostname, sockstrerror(sockerrno));
}
#endif
#if defined(SOL_TCP) && defined(TCP_NODELAY)
option = 1;
- setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
+ setsockopt(c->socket, SOL_TCP, TCP_NODELAY, (void *)&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));
+ setsockopt(c->socket, SOL_IP, IP_TOS, (void *)&option, sizeof(option));
+#endif
+}
+
+static bool bind_to_interface(int sd) {
+ char *iface;
+
+#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
+ struct ifreq ifr;
+ int status;
+#endif /* defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) */
+
+ if(!get_config_string (lookup_config (config_tree, "BindToInterface"), &iface))
+ return true;
+
+#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
+ ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
+
+ status = setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr));
+ if(status) {
+ logger(LOG_ERR, "Can't bind to interface %s: %s", iface,
+ strerror(errno));
+ return false;
+ }
+#else /* if !defined(SOL_SOCKET) || !defined(SO_BINDTODEVICE) */
+ logger(LOG_WARNING, "%s not supported on this platform", "BindToInterface");
#endif
+
+ return true;
+}
+
+static bool bind_to_address(connection_t *c) {
+ char *node;
+ struct addrinfo *ai_list;
+ struct addrinfo *ai_ptr;
+ struct addrinfo ai_hints;
+ int status;
+
+ assert(c != NULL);
+ assert(c->socket >= 0);
+
+ node = NULL;
+ if(!get_config_string(lookup_config(config_tree, "BindToAddress"),
+ &node))
+ return true;
+
+ assert(node != NULL);
+
+ memset(&ai_hints, 0, sizeof(ai_hints));
+ ai_hints.ai_family = c->address.sa.sa_family;
+ /* We're called from `do_outgoing_connection' only. */
+ ai_hints.ai_socktype = SOCK_STREAM;
+ ai_hints.ai_protocol = IPPROTO_TCP;
+
+ ai_list = NULL;
+
+ status = getaddrinfo(node, /* service = */ NULL,
+ &ai_hints, &ai_list);
+ if(status) {
+ free(node);
+ logger(LOG_WARNING, "Error looking up %s port %s: %s",
+ node, "any", gai_strerror(status));
+ return false;
+ }
+ assert(ai_list != NULL);
+
+ status = -1;
+ for(ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next) {
+ status = bind(c->socket,
+ ai_list->ai_addr, ai_list->ai_addrlen);
+ if(!status)
+ break;
+ }
+
+
+ if(status) {
+ logger(LOG_ERR, "Can't bind to %s/tcp: %s", node, sockstrerror(sockerrno));
+ } else ifdebug(CONNECTIONS) {
+ logger(LOG_DEBUG, "Successfully bound outgoing "
+ "TCP socket to %s", node);
+ }
+
+ free(node);
+ freeaddrinfo(ai_list);
+
+ return status ? false : true;
}
-int setup_listen_socket(const sockaddr_t *sa)
-{
+int setup_listen_socket(const sockaddr_t *sa) {
int nfd;
char *addrstr;
int option;
char *iface;
- cp();
-
nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
if(nfd < 0) {
- ifdebug(STATUS) logger(LOG_ERR, _("Creating metasocket failed: %s"), strerror(errno));
+ ifdebug(STATUS) logger(LOG_ERR, "Creating metasocket failed: %s", sockstrerror(sockerrno));
return -1;
}
/* Optimize TCP settings */
option = 1;
- setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
+ setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&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);
+ setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
#endif
if(get_config_string
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
- if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) {
+ if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr))) {
closesocket(nfd);
- logger(LOG_ERR, _("Can't bind to interface %s: %s"), iface,
- strerror(errno));
+ logger(LOG_ERR, "Can't bind to interface %s: %s", iface,
+ strerror(sockerrno));
return -1;
}
#else
- logger(LOG_WARNING, _("BindToInterface not supported on this platform"));
+ logger(LOG_WARNING, "%s not supported on this platform", "BindToInterface");
#endif
}
if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
closesocket(nfd);
addrstr = sockaddr2hostname(sa);
- logger(LOG_ERR, _("Can't bind to %s/tcp: %s"), addrstr,
- strerror(errno));
+ logger(LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
free(addrstr);
return -1;
}
if(listen(nfd, 3)) {
closesocket(nfd);
- logger(LOG_ERR, _("System call `%s' failed: %s"), "listen",
- strerror(errno));
+ logger(LOG_ERR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
return -1;
}
return nfd;
}
-int setup_vpn_in_socket(const sockaddr_t *sa)
-{
+int setup_vpn_in_socket(const sockaddr_t *sa) {
int nfd;
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));
+ logger(LOG_ERR, "Creating UDP socket failed: %s", sockstrerror(sockerrno));
return -1;
}
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
closesocket(nfd);
- logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl",
+ logger(LOG_ERR, "System call `%s' failed: %s", "fcntl",
strerror(errno));
return -1;
}
unsigned long arg = 1;
if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
closesocket(nfd);
- logger(LOG_ERR, _("Call to `%s' failed: WSA error %d"), "ioctlsocket",
- WSAGetLastError());
+ logger(LOG_ERR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
return -1;
}
}
#endif
option = 1;
- setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
+ setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option));
-#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
+ if(udp_rcvbuf && setsockopt(nfd, SOL_SOCKET, SO_RCVBUF, (void *)&udp_rcvbuf, sizeof(udp_rcvbuf)))
+ logger(LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, strerror(errno));
+
+ if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf)))
+ logger(LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, strerror(errno));
+
+#if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
if(sa->sa.sa_family == AF_INET6)
- setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, &option, sizeof option);
+ setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
#endif
-#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
- {
- bool choice;
+#if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
+#define IP_DONTFRAGMENT IP_DONTFRAG
+#endif
- 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));
- }
+#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
+ if(myself->options & OPTION_PMTU_DISCOVERY) {
+ option = IP_PMTUDISC_DO;
+ setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
}
+#elif defined(IPPROTO_IP) && defined(IP_DONTFRAGMENT)
+ if(myself->options & OPTION_PMTU_DISCOVERY) {
+ option = 1;
+ setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
+ }
+#else
+#warning No way to disable IPv4 fragmentation
#endif
#if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
- {
- bool choice;
-
- 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));
- }
+ if(myself->options & OPTION_PMTU_DISCOVERY) {
+ option = IPV6_PMTUDISC_DO;
+ setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
}
+#elif defined(IPPROTO_IPV6) && defined(IPV6_DONTFRAG)
+ if(myself->options & OPTION_PMTU_DISCOVERY) {
+ option = 1;
+ setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
+ }
+#else
+#warning No way to disable IPv6 fragmentation
#endif
-#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;
- }
- }
+ if (!bind_to_interface(nfd)) {
+ closesocket(nfd);
+ return -1;
}
-#endif
if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
closesocket(nfd);
addrstr = sockaddr2hostname(sa);
- logger(LOG_ERR, _("Can't bind to %s/udp: %s"), addrstr,
- strerror(errno));
+ logger(LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
free(addrstr);
return -1;
}
return nfd;
-}
-
-void retry_outgoing(outgoing_t *outgoing)
-{
- event_t *event;
-
- cp();
+} /* int setup_vpn_in_socket */
+void retry_outgoing(outgoing_t *outgoing) {
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(outgoing->event)
+ event_del(outgoing->event);
+ outgoing->event = new_event();
+ outgoing->event->handler = (event_handler_t) setup_outgoing_connection;
+ outgoing->event->time = now + outgoing->timeout;
+ outgoing->event->data = outgoing;
+ event_add(outgoing->event);
ifdebug(CONNECTIONS) logger(LOG_NOTICE,
- _("Trying to re-establish outgoing connection in %d seconds"),
+ "Trying to re-establish outgoing connection in %d seconds",
outgoing->timeout);
}
-void finish_connecting(connection_t *c)
-{
- cp();
-
- ifdebug(CONNECTIONS) logger(LOG_INFO, _("Connected to %s (%s)"), c->name, c->hostname);
+void finish_connecting(connection_t *c) {
+ ifdebug(CONNECTIONS) logger(LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
configure_tcp(c);
send_id(c);
}
-void do_outgoing_connection(connection_t *c)
-{
- char *address, *port;
+void do_outgoing_connection(connection_t *c) {
+ char *address, *port, *space;
int result;
- cp();
+ if(!c->outgoing) {
+ logger(LOG_ERR, "do_outgoing_connection() for %s called without c->outgoing", c->name);
+ abort();
+ }
begin:
if(!c->outgoing->ai) {
if(!c->outgoing->cfg) {
- ifdebug(CONNECTIONS) logger(LOG_ERR, _("Could not set up a meta connection to %s"),
+ ifdebug(CONNECTIONS) logger(LOG_ERR, "Could not set up a meta connection to %s",
c->name);
c->status.remove = true;
retry_outgoing(c->outgoing);
+ c->outgoing = NULL;
return;
}
get_config_string(c->outgoing->cfg, &address);
- if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
- asprintf(&port, "655");
+ space = strchr(address, ' ');
+ if(space) {
+ port = xstrdup(space + 1);
+ *space = 0;
+ } else {
+ if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
+ port = xstrdup("655");
+ }
c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
free(address);
c->hostname = sockaddr2hostname(&c->address);
- ifdebug(CONNECTIONS) logger(LOG_INFO, _("Trying to connect to %s (%s)"), c->name,
+ ifdebug(CONNECTIONS) logger(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) {
- ifdebug(CONNECTIONS) logger(LOG_ERR, _("Creating socket for %s failed: %s"), c->hostname,
- strerror(errno));
-
+ ifdebug(CONNECTIONS) logger(LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
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);
+ setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
#endif
+ bind_to_interface(c->socket);
+ bind_to_address(c);
+
/* Optimize TCP settings */
configure_tcp(c);
result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
if(result == -1) {
- if(errno == EINPROGRESS
-#if defined(WIN32) && !defined(O_NONBLOCK)
- || WSAGetLastError() == WSAEWOULDBLOCK
-#endif
- ) {
+ if(sockinprogress(sockerrno)) {
c->status.connecting = true;
return;
}
closesocket(c->socket);
- ifdebug(CONNECTIONS) logger(LOG_ERR, _("%s: %s"), c->hostname, strerror(errno));
+ ifdebug(CONNECTIONS) logger(LOG_ERR, "%s: %s", c->hostname, sockstrerror(sockerrno));
goto begin;
}
return;
}
-void setup_outgoing_connection(outgoing_t *outgoing)
-{
+void setup_outgoing_connection(outgoing_t *outgoing) {
connection_t *c;
node_t *n;
- cp();
+ outgoing->event = NULL;
n = lookup_node(outgoing->name);
if(n)
if(n->connection) {
- ifdebug(CONNECTIONS) logger(LOG_INFO, _("Already connected to %s"), outgoing->name);
+ ifdebug(CONNECTIONS) logger(LOG_INFO, "Already connected to %s", outgoing->name);
n->connection->outgoing = outgoing;
return;
outgoing->cfg = lookup_config(c->config_tree, "Address");
if(!outgoing->cfg) {
- logger(LOG_ERR, _("No address specified for %s"), c->name);
+ logger(LOG_ERR, "No address specified for %s", c->name);
free_connection(c);
return;
}
accept a new tcp connect and create a
new connection
*/
-bool handle_new_meta_connection(int sock)
-{
+bool handle_new_meta_connection(int sock) {
connection_t *c;
sockaddr_t sa;
int fd;
socklen_t len = sizeof(sa);
- cp();
-
fd = accept(sock, &sa.sa, &len);
if(fd < 0) {
- logger(LOG_ERR, _("Accepting a new connection failed: %s"),
- strerror(errno));
+ logger(LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
return false;
}
c->socket = fd;
c->last_ping_time = now;
- ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection from %s"), c->hostname);
+ ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Connection from %s", c->hostname);
configure_tcp(c);
free(outgoing);
}
-void try_outgoing_connections(void)
-{
+void try_outgoing_connections(void) {
static config_t *cfg = NULL;
char *name;
outgoing_t *outgoing;
- connection_t *c;
- avl_node_t *node;
- cp();
-
- if(outgoing_list) {
- for(node = connection_tree->head; node; node = node->next) {
- c = node->data;
- c->outgoing = NULL;
- }
-
- list_delete_list(outgoing_list);
- }
-
outgoing_list = list_alloc((list_action_t)free_outgoing);
for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
if(!check_id(name)) {
logger(LOG_ERR,
- _("Invalid name for outgoing connection in %s line %d"),
+ "Invalid name for outgoing connection in %s line %d",
cfg->file, cfg->line);
free(name);
continue;
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