/*
net_socket.c -- Handle various kinds of sockets.
Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2009 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2014 Guus Sliepen <guus@tinc-vpn.org>
2006 Scott Lamb <slamb@slamb.org>
2009 Florian Forster <octo@verplant.org>
#include "system.h"
-#include "splay_tree.h"
#include "conf.h"
#include "connection.h"
+#include "control_common.h"
+#include "list.h"
#include "logger.h"
#include "meta.h"
+#include "names.h"
#include "net.h"
#include "netutl.h"
#include "protocol.h"
#include "utils.h"
#include "xalloc.h"
-#include <assert.h>
-
/* Needed on Mac OS/X */
#ifndef SOL_TCP
#define SOL_TCP IPPROTO_TCP
int addressfamily = AF_UNSPEC;
int maxtimeout = 900;
int seconds_till_retry = 5;
+int udp_rcvbuf = 1024 * 1024;
+int udp_sndbuf = 1024 * 1024;
+int max_connection_burst = 100;
listen_socket_t listen_socket[MAXSOCKETS];
int listen_sockets;
+#ifndef HAVE_MINGW
+io_t unix_socket;
+#endif
list_t *outgoing_list = NULL;
/* Setup sockets */
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(DEBUG_ALWAYS, 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: %d", c->hostname, sockstrerror(sockerrno));
+ logger(DEBUG_ALWAYS, LOG_ERR, "ioctlsocket for %s: %s", 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
}
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
- status = setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
+ 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));
+ logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
+ sockstrerror(sockerrno));
return false;
}
#else /* if !defined(SOL_SOCKET) || !defined(SO_BINDTODEVICE) */
- logger(LOG_WARNING, "%s not supported on this platform", "BindToInterface");
+ logger(DEBUG_ALWAYS, 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);
+ int s = -1;
- 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;
+ for(int i = 0; i < listen_sockets && listen_socket[i].bindto; i++) {
+ if(listen_socket[i].sa.sa.sa_family != c->address.sa.sa_family)
+ continue;
+ if(s >= 0)
+ return false;
+ s = i;
}
- 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(s < 0)
+ return false;
+ sockaddr_t sa = listen_socket[s].sa;
+ if(sa.sa.sa_family == AF_INET)
+ sa.in.sin_port = 0;
+ else if(sa.sa.sa_family == AF_INET6)
+ sa.in6.sin6_port = 0;
- 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);
+ if(bind(c->socket, &sa.sa, SALEN(sa.sa))) {
+ logger(DEBUG_CONNECTIONS, LOG_WARNING, "Can't bind outgoing socket: %s", sockstrerror(sockerrno));
+ return false;
}
- free(node);
- freeaddrinfo(ai_list);
-
- return status ? false : true;
+ return true;
}
int setup_listen_socket(const sockaddr_t *sa) {
nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
if(nfd < 0) {
- ifdebug(STATUS) logger(LOG_ERR, "Creating metasocket failed: %s", sockstrerror(sockerrno));
+ logger(DEBUG_STATUS, LOG_ERR, "Creating metasocket failed: %s", sockstrerror(sockerrno));
return -1;
}
+#ifdef FD_CLOEXEC
+ fcntl(nfd, F_SETFD, FD_CLOEXEC);
+#endif
+
/* 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(sockerrno));
+ logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
+ sockstrerror(sockerrno));
return -1;
}
#else
- logger(LOG_WARNING, "%s not supported on this platform", "BindToInterface");
+ logger(DEBUG_ALWAYS, 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, sockstrerror(sockerrno));
+ logger(DEBUG_ALWAYS, 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", sockstrerror(sockerrno));
+ logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
return -1;
}
nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
if(nfd < 0) {
- logger(LOG_ERR, "Creating UDP socket failed: %s", sockstrerror(sockerrno));
+ logger(DEBUG_ALWAYS, LOG_ERR, "Creating UDP socket failed: %s", sockstrerror(sockerrno));
return -1;
}
+#ifdef FD_CLOEXEC
+ fcntl(nfd, F_SETFD, FD_CLOEXEC);
+#endif
+
#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",
+ logger(DEBUG_ALWAYS, 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: %s", "ioctlsocket", sockstrerror(sockerrno));
+ logger(DEBUG_ALWAYS, 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);
+ setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (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(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, sockstrerror(sockerrno));
+
+ if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf)))
+ logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, sockstrerror(sockerrno));
+
+#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(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
+#define IP_DONTFRAGMENT IP_DONTFRAG
#endif
#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, &option, sizeof(option));
+ 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, &option, sizeof(option));
+ setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
}
#endif
#if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
if(myself->options & OPTION_PMTU_DISCOVERY) {
option = IPV6_PMTUDISC_DO;
- setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, &option, sizeof(option));
+ 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));
}
#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, sockstrerror(sockerrno));
+ logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
free(addrstr);
return -1;
}
return nfd;
} /* int setup_vpn_in_socket */
-static void retry_outgoing_handler(int fd, short events, void *data) {
+static void retry_outgoing_handler(void *data) {
setup_outgoing_connection(data);
}
if(outgoing->timeout > maxtimeout)
outgoing->timeout = maxtimeout;
- timeout_set(&outgoing->ev, retry_outgoing_handler, outgoing);
- event_add(&outgoing->ev, &(struct timeval){outgoing->timeout, 0});
+ timeout_add(&outgoing->ev, retry_outgoing_handler, outgoing, &(struct timeval){outgoing->timeout, rand() % 100000});
- ifdebug(CONNECTIONS) logger(LOG_NOTICE,
- "Trying to re-establish outgoing connection in %d seconds",
- outgoing->timeout);
+ logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Trying to re-establish outgoing connection in %d seconds", outgoing->timeout);
}
void finish_connecting(connection_t *c) {
- ifdebug(CONNECTIONS) logger(LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
-
- configure_tcp(c);
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
- c->last_ping_time = time(NULL);
+ c->last_ping_time = now.tv_sec;
c->status.connecting = false;
send_id(c);
}
-void do_outgoing_connection(connection_t *c) {
- char *address, *port;
- int result;
+static void do_outgoing_pipe(connection_t *c, char *command) {
+#ifndef HAVE_MINGW
+ int fd[2];
- if(!c->outgoing) {
- logger(LOG_ERR, "do_outgoing_connection() for %s called without c->outgoing", c->name);
- abort();
+ if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Could not create socketpair: %s", sockstrerror(sockerrno));
+ return;
}
-begin:
- if(!c->outgoing->ai) {
- if(!c->outgoing->cfg) {
- ifdebug(CONNECTIONS) logger(LOG_ERR, "Could not set up a meta connection to %s",
- c->name);
- retry_outgoing(c->outgoing);
- c->outgoing = NULL;
- connection_del(c);
+ if(fork()) {
+ c->socket = fd[0];
+ close(fd[1]);
+ logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Using proxy %s", command);
+ return;
+ }
+
+ close(0);
+ close(1);
+ close(fd[0]);
+ dup2(fd[1], 0);
+ dup2(fd[1], 1);
+ close(fd[1]);
+
+ // Other filedescriptors should be closed automatically by CLOEXEC
+
+ char *host = NULL;
+ char *port = NULL;
+
+ sockaddr2str(&c->address, &host, &port);
+ setenv("REMOTEADDRESS", host, true);
+ setenv("REMOTEPORT", port, true);
+ setenv("NODE", c->name, true);
+ setenv("NAME", myself->name, true);
+ if(netname)
+ setenv("NETNAME", netname, true);
+
+ int result = system(command);
+ if(result < 0)
+ logger(DEBUG_ALWAYS, LOG_ERR, "Could not execute %s: %s", command, strerror(errno));
+ else if(result)
+ logger(DEBUG_ALWAYS, LOG_ERR, "%s exited with non-zero status %d", command, result);
+ exit(result);
+#else
+ logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type exec not supported on this platform!");
+ return;
+#endif
+}
+
+static void handle_meta_write(connection_t *c) {
+ if(c->outbuf.len <= c->outbuf.offset)
+ return;
+
+ ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, 0);
+ if(outlen <= 0) {
+ if(!sockerrno || sockerrno == EPIPE) {
+ logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)", c->name, c->hostname);
+ } else if(sockwouldblock(sockerrno)) {
+ logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Sending %d bytes to %s (%s) would block", c->outbuf.len - c->outbuf.offset, c->name, c->hostname);
return;
+ } else {
+ logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not send %d bytes of data to %s (%s): %s", c->outbuf.len - c->outbuf.offset, c->name, c->hostname, sockstrerror(sockerrno));
}
- get_config_string(c->outgoing->cfg, &address);
+ terminate_connection(c, c->edge);
+ return;
+ }
- if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
- xasprintf(&port, "655");
+ buffer_read(&c->outbuf, outlen);
+ if(!c->outbuf.len)
+ io_set(&c->io, IO_READ);
+}
- c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
+static void handle_meta_io(void *data, int flags) {
+ connection_t *c = data;
+
+ if(c->status.connecting) {
+ /*
+ The event loop does not protect against spurious events. Verify that we are actually connected
+ by issuing an empty send() call.
+
+ Note that the behavior of send() on potentially unconnected sockets differ between platforms:
+ +------------+-----------+-------------+-----------+
+ | Event | POSIX | Linux | Windows |
+ +------------+-----------+-------------+-----------+
+ | Spurious | ENOTCONN | EWOULDBLOCK | ENOTCONN |
+ | Failed | ENOTCONN | (cause) | ENOTCONN |
+ | Successful | (success) | (success) | (success) |
+ +------------+-----------+-------------+-----------+
+ */
+ if (send(c->socket, NULL, 0, 0) != 0) {
+ if (sockwouldblock(sockerrno))
+ return;
+ int socket_error;
+ if (!socknotconn(sockerrno))
+ socket_error = sockerrno;
+ else {
+ socklen_t len = sizeof socket_error;
+ getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&socket_error, &len);
+ }
+ if (socket_error) {
+ logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Error while connecting to %s (%s): %s", c->name, c->hostname, sockstrerror(socket_error));
+ terminate_connection(c, false);
+ }
+ return;
+ }
+
+ c->status.connecting = false;
+ finish_connecting(c);
+ }
+
+ if(flags & IO_WRITE)
+ handle_meta_write(c);
+ else
+ handle_meta_connection_data(c);
+}
+
+bool do_outgoing_connection(outgoing_t *outgoing) {
+ char *address, *port, *space;
+ struct addrinfo *proxyai = NULL;
+ int result;
+
+begin:
+ if(!outgoing->ai) {
+ if(!outgoing->cfg) {
+ logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not set up a meta connection to %s", outgoing->name);
+ retry_outgoing(outgoing);
+ return false;
+ }
+
+ get_config_string(outgoing->cfg, &address);
+
+ space = strchr(address, ' ');
+ if(space) {
+ port = xstrdup(space + 1);
+ *space = 0;
+ } else {
+ if(!get_config_string(lookup_config(outgoing->config_tree, "Port"), &port))
+ port = xstrdup("655");
+ }
+
+ 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);
+ outgoing->aip = outgoing->ai;
+ outgoing->cfg = lookup_config_next(outgoing->config_tree, outgoing->cfg);
}
- if(!c->outgoing->aip) {
- if(c->outgoing->ai)
- freeaddrinfo(c->outgoing->ai);
- c->outgoing->ai = NULL;
+ if(!outgoing->aip) {
+ if(outgoing->ai)
+ freeaddrinfo(outgoing->ai);
+ 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;
+ connection_t *c = new_connection();
+ c->outgoing = outgoing;
- if(c->hostname)
- free(c->hostname);
+ memcpy(&c->address, outgoing->aip->ai_addr, outgoing->aip->ai_addrlen);
+ outgoing->aip = outgoing->aip->ai_next;
c->hostname = sockaddr2hostname(&c->address);
- 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);
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "Trying to connect to %s (%s)", outgoing->name, c->hostname);
+
+ if(!proxytype) {
+ c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
+ configure_tcp(c);
+ } else if(proxytype == PROXY_EXEC) {
+ do_outgoing_pipe(c, proxyhost);
+ } else {
+ proxyai = str2addrinfo(proxyhost, proxyport, SOCK_STREAM);
+ if(!proxyai) {
+ free_connection(c);
+ goto begin;
+ }
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "Using proxy at %s port %s", proxyhost, proxyport);
+ c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
+ configure_tcp(c);
+ }
if(c->socket == -1) {
- ifdebug(CONNECTIONS) logger(LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
+ logger(DEBUG_CONNECTIONS, LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
+ free_connection(c);
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);
+#ifdef FD_CLOEXEC
+ fcntl(c->socket, F_SETFD, FD_CLOEXEC);
#endif
- bind_to_interface(c->socket);
- bind_to_address(c);
-
- /* Optimize TCP settings */
+ if(proxytype != PROXY_EXEC) {
+#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, (void *)&option, sizeof option);
+#endif
- configure_tcp(c);
+ bind_to_interface(c->socket);
+ bind_to_address(c);
+ }
/* Connect */
- result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
-
- if(result == -1) {
- if(sockinprogress(sockerrno)) {
- c->status.connecting = true;
- return;
- }
-
- closesocket(c->socket);
+ if(!proxytype) {
+ result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
+ } else if(proxytype == PROXY_EXEC) {
+ result = 0;
+ } else {
+ result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
+ freeaddrinfo(proxyai);
+ }
- ifdebug(CONNECTIONS) logger(LOG_ERR, "%s: %s", c->hostname, sockstrerror(sockerrno));
+ if(result == -1 && !sockinprogress(sockerrno)) {
+ logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not connect to %s (%s): %s", outgoing->name, c->hostname, sockstrerror(sockerrno));
+ free_connection(c);
goto begin;
}
- finish_connecting(c);
+ /* Now that there is a working socket, fill in the rest and register this connection. */
- return;
-}
+ c->status.connecting = true;
+ c->name = xstrdup(outgoing->name);
+#ifndef DISABLE_LEGACY
+ c->outcipher = myself->connection->outcipher;
+ c->outdigest = myself->connection->outdigest;
+#endif
+ c->outmaclength = myself->connection->outmaclength;
+ c->outcompression = myself->connection->outcompression;
+ c->last_ping_time = now.tv_sec;
-void handle_meta_read(struct bufferevent *event, void *data) {
- logger(LOG_EMERG, "handle_meta_read() called");
- abort();
-}
+ connection_add(c);
-void handle_meta_write(struct bufferevent *event, void *data) {
- ifdebug(META) logger(LOG_DEBUG, "handle_meta_write() called");
-}
+ io_add(&c->io, handle_meta_io, c, c->socket, IO_READ|IO_WRITE);
-void handle_meta_connection_error(struct bufferevent *event, short what, void *data) {
- connection_t *c = data;
- logger(LOG_EMERG, "handle_meta_connection_error() called: %d: %s", what, strerror(errno));
- terminate_connection(c, c->status.active);
+ return true;
}
-void setup_outgoing_connection(outgoing_t *outgoing) {
- connection_t *c;
- node_t *n;
+// Find edges pointing to this node, and use them to build a list of unique, known addresses.
+static struct addrinfo *get_known_addresses(node_t *n) {
+ struct addrinfo *ai = NULL;
- event_del(&outgoing->ev);
+ for splay_each(edge_t, e, n->edge_tree) {
+ if(!e->reverse)
+ continue;
- n = lookup_node(outgoing->name);
+ bool found = false;
+ for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
+ if(!sockaddrcmp(&e->reverse->address, (sockaddr_t *)aip->ai_addr)) {
+ found = true;
+ break;
+ }
+ }
+ if(found)
+ continue;
- if(n)
- if(n->connection) {
- ifdebug(CONNECTIONS) logger(LOG_INFO, "Already connected to %s", outgoing->name);
+ struct addrinfo *nai = xzalloc(sizeof *nai);
+ if(ai)
+ ai->ai_next = nai;
+ ai = nai;
+ ai->ai_family = e->reverse->address.sa.sa_family;
+ ai->ai_socktype = SOCK_STREAM;
+ ai->ai_protocol = IPPROTO_TCP;
+ ai->ai_addrlen = SALEN(e->reverse->address.sa);
+ ai->ai_addr = xmalloc(ai->ai_addrlen);
+ memcpy(ai->ai_addr, &e->reverse->address, ai->ai_addrlen);
+ }
+ return ai;
+}
+
+void setup_outgoing_connection(outgoing_t *outgoing) {
+ timeout_del(&outgoing->ev);
+
+ node_t *n = lookup_node(outgoing->name);
+
+ if(n && n->connection) {
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "Already connected to %s", outgoing->name);
+ if(!n->connection->outgoing) {
n->connection->outgoing = outgoing;
return;
+ } else {
+ goto remove;
}
+ }
- 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");
+ init_configuration(&outgoing->config_tree);
+ read_host_config(outgoing->config_tree, outgoing->name);
+ outgoing->cfg = lookup_config(outgoing->config_tree, "Address");
if(!outgoing->cfg) {
- logger(LOG_ERR, "No address specified for %s", c->name);
- free_connection(c);
- return;
+ if(n)
+ outgoing->aip = outgoing->ai = get_known_addresses(n);
+ if(!outgoing->ai) {
+ logger(DEBUG_ALWAYS, LOG_DEBUG, "No address known for %s", outgoing->name);
+ goto remove;
+ }
}
- c->outgoing = outgoing;
- c->last_ping_time = time(NULL);
-
- connection_add(c);
-
- do_outgoing_connection(c);
+ do_outgoing_connection(outgoing);
+ return;
- event_set(&c->inevent, c->socket, EV_READ | EV_PERSIST, handle_meta_connection_data, c);
- event_add(&c->inevent, NULL);
- c->buffer = bufferevent_new(c->socket, handle_meta_read, handle_meta_write, handle_meta_connection_error, c);
- if(!c->buffer) {
- logger(LOG_EMERG, "bufferevent_new() failed: %s", strerror(errno));
- abort();
- }
- bufferevent_disable(c->buffer, EV_READ);
+remove:
+ list_delete(outgoing_list, outgoing);
}
/*
accept a new tcp connect and create a
new connection
*/
-void handle_new_meta_connection(int sock, short events, void *data) {
+void handle_new_meta_connection(void *data, int flags) {
+ listen_socket_t *l = data;
connection_t *c;
sockaddr_t sa;
int fd;
socklen_t len = sizeof sa;
- fd = accept(sock, &sa.sa, &len);
+ fd = accept(l->tcp.fd, &sa.sa, &len);
if(fd < 0) {
- logger(LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
+ logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
return;
}
sockaddrunmap(&sa);
+ // Check if we get many connections from the same host
+
+ static sockaddr_t prev_sa;
+ static int tarpit = -1;
+
+ if(tarpit >= 0) {
+ closesocket(tarpit);
+ tarpit = -1;
+ }
+
+ if(!sockaddrcmp_noport(&sa, &prev_sa)) {
+ static int samehost_burst;
+ static int samehost_burst_time;
+
+ if(now.tv_sec - samehost_burst_time > samehost_burst)
+ samehost_burst = 0;
+ else
+ samehost_burst -= now.tv_sec - samehost_burst_time;
+
+ samehost_burst_time = now.tv_sec;
+ samehost_burst++;
+
+ if(samehost_burst > max_connection_burst) {
+ tarpit = fd;
+ return;
+ }
+ }
+
+ memcpy(&prev_sa, &sa, sizeof sa);
+
+ // Check if we get many connections from different hosts
+
+ static int connection_burst;
+ static int connection_burst_time;
+
+ if(now.tv_sec - connection_burst_time > connection_burst)
+ connection_burst = 0;
+ else
+ connection_burst -= now.tv_sec - connection_burst_time;
+
+ connection_burst_time = now.tv_sec;
+ connection_burst++;
+
+ if(connection_burst >= max_connection_burst) {
+ connection_burst = max_connection_burst;
+ tarpit = fd;
+ return;
+ }
+
+ // Accept the new connection
+
c = new_connection();
c->name = xstrdup("<unknown>");
+#ifndef DISABLE_LEGACY
c->outcipher = myself->connection->outcipher;
c->outdigest = myself->connection->outdigest;
+#endif
c->outmaclength = myself->connection->outmaclength;
c->outcompression = myself->connection->outcompression;
c->address = sa;
c->hostname = sockaddr2hostname(&sa);
c->socket = fd;
- c->last_ping_time = time(NULL);
+ c->last_ping_time = now.tv_sec;
- ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Connection from %s", c->hostname);
+ logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
+
+ io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
- event_set(&c->inevent, c->socket, EV_READ | EV_PERSIST, handle_meta_connection_data, c);
- event_add(&c->inevent, NULL);
- c->buffer = bufferevent_new(c->socket, NULL, handle_meta_write, handle_meta_connection_error, c);
- if(!c->buffer) {
- logger(LOG_EMERG, "bufferevent_new() failed: %s", strerror(errno));
- abort();
- }
- bufferevent_disable(c->buffer, EV_READ);
-
configure_tcp(c);
connection_add(c);
send_id(c);
}
-void free_outgoing(outgoing_t *outgoing) {
+#ifndef HAVE_MINGW
+/*
+ accept a new UNIX socket connection
+*/
+void handle_new_unix_connection(void *data, int flags) {
+ io_t *io = data;
+ connection_t *c;
+ sockaddr_t sa;
+ int fd;
+ socklen_t len = sizeof sa;
+
+ fd = accept(io->fd, &sa.sa, &len);
+
+ if(fd < 0) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
+ return;
+ }
+
+ sockaddrunmap(&sa);
+
+ c = new_connection();
+ c->name = xstrdup("<control>");
+ c->address = sa;
+ c->hostname = xstrdup("localhost port unix");
+ c->socket = fd;
+ c->last_ping_time = now.tv_sec;
+
+ logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
+
+ io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
+
+ connection_add(c);
+
+ c->allow_request = ID;
+
+ send_id(c);
+}
+#endif
+
+static void free_outgoing(outgoing_t *outgoing) {
+ timeout_del(&outgoing->ev);
+
if(outgoing->ai)
freeaddrinfo(outgoing->ai);
+ if(outgoing->config_tree)
+ exit_configuration(&outgoing->config_tree);
+
if(outgoing->name)
free(outgoing->name);
}
void try_outgoing_connections(void) {
- static config_t *cfg = NULL;
- char *name;
- outgoing_t *outgoing;
-
- 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 there is no outgoing list yet, create one. Otherwise, mark all outgoings as deleted. */
+
+ if(!outgoing_list) {
+ outgoing_list = list_alloc((list_action_t)free_outgoing);
+ } else {
+ for list_each(outgoing_t, outgoing, outgoing_list)
+ outgoing->timeout = -1;
+ }
+
+ /* Make sure there is one outgoing_t in the list for each ConnectTo. */
+
+ for(config_t *cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
+ char *name;
get_config_string(cfg, &name);
if(!check_id(name)) {
- logger(LOG_ERR,
+ logger(DEBUG_ALWAYS, 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;
- list_insert_tail(outgoing_list, outgoing);
- setup_outgoing_connection(outgoing);
+ if(!strcmp(name, myself->name)) {
+ free(name);
+ continue;
+ }
+
+ bool found = false;
+
+ for list_each(outgoing_t, outgoing, outgoing_list) {
+ if(!strcmp(outgoing->name, name)) {
+ found = true;
+ outgoing->timeout = 0;
+ break;
+ }
+ }
+
+ if(!found) {
+ outgoing_t *outgoing = xzalloc(sizeof *outgoing);
+ outgoing->name = name;
+ list_insert_tail(outgoing_list, outgoing);
+ setup_outgoing_connection(outgoing);
+ }
+ }
+
+ /* Terminate any connections whose outgoing_t is to be deleted. */
+
+ for list_each(connection_t, c, connection_list) {
+ if(c->outgoing && c->outgoing->timeout == -1) {
+ c->outgoing = NULL;
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "No more outgoing connection to %s", c->name);
+ terminate_connection(c, c->edge);
+ }
}
+
+ /* Delete outgoing_ts for which there is no ConnectTo. */
+
+ for list_each(outgoing_t, outgoing, outgoing_list)
+ if(outgoing->timeout == -1)
+ list_delete_node(outgoing_list, node);
}
projects / tinc / blobdiff