X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet_socket.c;h=48e07834aefa5408895ff24d9087cbabb460e564;hp=d8bb007876320dbe72536a78748e15cac0b87a7d;hb=724d79e88051b9c50704424c1cda2cedcf87dba0;hpb=d1dcdf8eb6f800704be426b1ce6f6c1a8e65ba0d diff --git a/src/net_socket.c b/src/net_socket.c index d8bb0078..48e07834 100644 --- a/src/net_socket.c +++ b/src/net_socket.c @@ -1,7 +1,7 @@ /* net_socket.c -- Handle various kinds of sockets. Copyright (C) 1998-2005 Ivo Timmermans, - 2000-2012 Guus Sliepen + 2000-2013 Guus Sliepen 2006 Scott Lamb 2009 Florian Forster @@ -34,8 +34,6 @@ #include "utils.h" #include "xalloc.h" -#include - /* Needed on Mac OS/X */ #ifndef SOL_TCP #define SOL_TCP IPPROTO_TCP @@ -66,7 +64,7 @@ static void configure_tcp(connection_t *c) { unsigned long arg = 1; if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) { - logger(LOG_ERR, "ioctlsocket for %s: %d", c->hostname, sockstrerror(sockerrno)); + logger(LOG_ERR, "ioctlsocket for %s: %s", c->hostname, sockstrerror(sockerrno)); } #endif @@ -110,63 +108,6 @@ static bool bind_to_interface(int sd) { 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 nfd; char *addrstr; @@ -270,6 +211,7 @@ int setup_vpn_in_socket(const sockaddr_t *sa) { option = 1; setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option)); + setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof(option)); 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)); @@ -352,15 +294,62 @@ void retry_outgoing(outgoing_t *outgoing) { void finish_connecting(connection_t *c) { ifdebug(CONNECTIONS) logger(LOG_INFO, "Connected to %s (%s)", c->name, c->hostname); - configure_tcp(c); - c->last_ping_time = now; send_id(c); } +static void do_outgoing_pipe(connection_t *c, char *command) { +#ifndef HAVE_MINGW + int fd[2]; + + if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) { + logger(LOG_ERR, "Could not create socketpair: %s\n", strerror(errno)); + return; + } + + if(fork()) { + c->socket = fd[0]; + close(fd[1]); + logger(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(LOG_ERR, "Could not execute %s: %s\n", command, strerror(errno)); + else if(result) + logger(LOG_ERR, "%s exited with non-zero status %d", command, result); + exit(result); +#else + logger(LOG_ERR, "Proxy type exec not supported on this platform!"); + return; +#endif +} + void do_outgoing_connection(connection_t *c) { char *address, *port, *space; + struct addrinfo *proxyai = NULL; int result; if(!c->outgoing) { @@ -416,33 +405,49 @@ begin: 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); - -#ifdef FD_CLOEXEC - fcntl(c->socket, F_SETFD, FD_CLOEXEC); -#endif + 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) + goto begin; + ifdebug(CONNECTIONS) logger(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)); 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, (void *)&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); + } /* Connect */ - result = connect(c->socket, &c->address.sa, SALEN(c->address.sa)); + 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); + } if(result == -1) { if(sockinprogress(sockerrno)) {