diff options
Diffstat (limited to 'openvpn/socket.c')
| -rw-r--r-- | openvpn/socket.c | 2175 |
1 files changed, 0 insertions, 2175 deletions
diff --git a/openvpn/socket.c b/openvpn/socket.c deleted file mode 100644 index c82471f..0000000 --- a/openvpn/socket.c +++ /dev/null @@ -1,2175 +0,0 @@ -/* - * OpenVPN -- An application to securely tunnel IP networks - * over a single TCP/UDP port, with support for SSL/TLS-based - * session authentication and key exchange, - * packet encryption, packet authentication, and - * packet compression. - * - * Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@openvpn.net> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 - * as published by the Free Software Foundation. - * - * 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 (see the file COPYING included with this - * distribution); if not, write to the Free Software Foundation, Inc., - * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#ifdef WIN32 -#include "config-win32.h" -#else -#include "config.h" -#endif - -#include "syshead.h" - -#include "socket.h" -#include "fdmisc.h" -#include "thread.h" -#include "misc.h" -#include "gremlin.h" -#include "plugin.h" - -#include "memdbg.h" - -/* - * Functions related to the translation of DNS names to IP addresses. - */ - -static const char* -h_errno_msg(int h_errno_err) -{ - switch (h_errno_err) - { - case HOST_NOT_FOUND: - return "[HOST_NOT_FOUND] The specified host is unknown."; - case NO_DATA: - return "[NO_DATA] The requested name is valid but does not have an IP address."; - case NO_RECOVERY: - return "[NO_RECOVERY] A non-recoverable name server error occurred."; - case TRY_AGAIN: - return "[TRY_AGAIN] A temporary error occurred on an authoritative name server."; - } - return "[unknown h_errno value]"; -} - -/* - * Translate IP addr or hostname to in_addr_t. - * If resolve error, try again for - * resolve_retry_seconds seconds. - */ -in_addr_t -getaddr (unsigned int flags, - const char *hostname, - int resolve_retry_seconds, - bool *succeeded, - volatile int *signal_received) -{ - struct in_addr ia; - int status; - int sigrec = 0; - int msglevel = (flags & GETADDR_FATAL) ? M_FATAL : D_RESOLVE_ERRORS; - - if (flags & GETADDR_MSG_VIRT_OUT) - msglevel |= M_MSG_VIRT_OUT; - - CLEAR (ia); - if (succeeded) - *succeeded = false; - - if ((flags & (GETADDR_FATAL_ON_SIGNAL|GETADDR_WARN_ON_SIGNAL)) - && !signal_received) - signal_received = &sigrec; - - status = openvpn_inet_aton (hostname, &ia); /* parse ascii IP address */ - - if (status != OIA_IP) /* parse as IP address failed? */ - { - const int fail_wait_interval = 5; /* seconds */ - int resolve_retries = (flags & GETADDR_TRY_ONCE) ? 1 : (resolve_retry_seconds / fail_wait_interval); - struct hostent *h; - const char *fmt; - int level = 0; - - CLEAR (ia); - - fmt = "RESOLVE: Cannot resolve host address: %s: %s"; - if ((flags & GETADDR_MENTION_RESOLVE_RETRY) - && !resolve_retry_seconds) - fmt = "RESOLVE: Cannot resolve host address: %s: %s (I would have retried this name query if you had specified the --resolv-retry option.)"; - - if (!(flags & GETADDR_RESOLVE) || status == OIA_ERROR) - { - msg (msglevel, "RESOLVE: Cannot parse IP address: %s", hostname); - goto done; - } - - /* - * Resolve hostname - */ - while (true) - { - /* try hostname lookup */ - h = gethostbyname (hostname); - - if (signal_received) - { - get_signal (signal_received); - if (*signal_received) /* were we interrupted by a signal? */ - { - h = NULL; - if (*signal_received == SIGUSR1) /* ignore SIGUSR1 */ - { - msg (level, "RESOLVE: Ignored SIGUSR1 signal received during DNS resolution attempt"); - *signal_received = 0; - } - else - goto done; - } - } - - /* success? */ - if (h) - break; - - /* resolve lookup failed, should we - continue or fail? */ - - level = msglevel; - if (resolve_retries > 0) - level = D_RESOLVE_ERRORS; - - msg (level, - fmt, - hostname, - h_errno_msg (h_errno)); - - if (--resolve_retries <= 0) - goto done; - - openvpn_sleep (fail_wait_interval); - } - - if (h->h_addrtype != AF_INET || h->h_length != 4) - { - msg (msglevel, "RESOLVE: Sorry, but we only accept IPv4 DNS names: %s", hostname); - goto done; - } - - ia.s_addr = *(in_addr_t *) (h->h_addr_list[0]); - - if (ia.s_addr) - { - if (h->h_addr_list[1]) /* more than one address returned */ - { - int n = 0; - - /* count address list */ - while (h->h_addr_list[n]) - ++n; - ASSERT (n >= 2); - - msg (D_RESOLVE_ERRORS, "RESOLVE: NOTE: %s resolves to %d addresses, choosing one by random", - hostname, - n); - - /* choose address randomly, for basic load-balancing capability */ - ia.s_addr = *(in_addr_t *) (h->h_addr_list[get_random () % n]); - } - } - - /* hostname resolve succeeded */ - if (succeeded) - *succeeded = true; - } - else - { - /* IP address parse succeeded */ - if (succeeded) - *succeeded = true; - } - - done: - if (signal_received && *signal_received) - { - int level = 0; - if (flags & GETADDR_FATAL_ON_SIGNAL) - level = M_FATAL; - else if (flags & GETADDR_WARN_ON_SIGNAL) - level = M_WARN; - msg (level, "RESOLVE: signal received during DNS resolution attempt"); - } - - return (flags & GETADDR_HOST_ORDER) ? ntohl (ia.s_addr) : ia.s_addr; -} - -/* - * We do our own inet_aton because the glibc function - * isn't very good about error checking. - */ -int -openvpn_inet_aton (const char *dotted_quad, struct in_addr *addr) -{ - unsigned int a, b, c, d; - - CLEAR (*addr); - if (sscanf (dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) == 4) - { - if (a < 256 && b < 256 && c < 256 && d < 256) - { - addr->s_addr = htonl (a<<24 | b<<16 | c<<8 | d); - return OIA_IP; /* good dotted quad */ - } - } - if (string_class (dotted_quad, CC_DIGIT|CC_DOT, 0)) - return OIA_ERROR; /* probably a badly formatted dotted quad */ - else - return OIA_HOSTNAME; /* probably a hostname */ -} - -static void -update_remote (const char* host, - struct sockaddr_in *addr, - bool *changed) -{ - if (host && addr) - { - const in_addr_t new_addr = getaddr ( - GETADDR_RESOLVE, - host, - 1, - NULL, - NULL); - if (new_addr && addr->sin_addr.s_addr != new_addr) - { - addr->sin_addr.s_addr = new_addr; - *changed = true; - } - } -} - -static int -socket_get_sndbuf (int sd) -{ -#if defined(HAVE_GETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_SNDBUF) - int val; - socklen_t len; - - len = sizeof (val); - if (getsockopt (sd, SOL_SOCKET, SO_SNDBUF, (void *) &val, &len) == 0 - && len == sizeof (val)) - return val; -#endif - return 0; -} - -static void -socket_set_sndbuf (int sd, int size) -{ -#if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_SNDBUF) - if (setsockopt (sd, SOL_SOCKET, SO_SNDBUF, (void *) &size, sizeof (size)) != 0) - { - msg (M_WARN, "NOTE: setsockopt SO_SNDBUF=%d failed", size); - } -#endif -} - -static int -socket_get_rcvbuf (int sd) -{ -#if defined(HAVE_GETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_RCVBUF) - int val; - socklen_t len; - - len = sizeof (val); - if (getsockopt (sd, SOL_SOCKET, SO_RCVBUF, (void *) &val, &len) == 0 - && len == sizeof (val)) - return val; -#endif - return 0; -} - -static bool -socket_set_rcvbuf (int sd, int size) -{ -#if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_RCVBUF) - if (setsockopt (sd, SOL_SOCKET, SO_RCVBUF, (void *) &size, sizeof (size)) != 0) - { - msg (M_WARN, "NOTE: setsockopt SO_RCVBUF=%d failed", size); - return false; - } - return true; -#endif -} - -static void -socket_set_buffers (int fd, const struct socket_buffer_size *sbs) -{ - if (sbs) - { - const int sndbuf_old = socket_get_sndbuf (fd); - const int rcvbuf_old = socket_get_rcvbuf (fd); - - if (sbs->sndbuf) - socket_set_sndbuf (fd, sbs->sndbuf); - - if (sbs->rcvbuf) - socket_set_rcvbuf (fd, sbs->rcvbuf); - - msg (D_OSBUF, "Socket Buffers: R=[%d->%d] S=[%d->%d]", - rcvbuf_old, - socket_get_rcvbuf (fd), - sndbuf_old, - socket_get_sndbuf (fd)); - } -} - -/* - * Remote list code allows clients to specify a list of - * potential remote server addresses. - */ - -static void -remote_list_next (struct remote_list *l) -{ - if (l) - { - if (l->no_advance && l->current >= 0) - { - l->no_advance = false; - } - else - { - int i; - if (++l->current >= l->len) - l->current = 0; - - dmsg (D_REMOTE_LIST, "REMOTE_LIST len=%d current=%d", - l->len, l->current); - for (i = 0; i < l->len; ++i) - { - dmsg (D_REMOTE_LIST, "[%d] %s:%d", - i, - l->array[i].hostname, - l->array[i].port); - } - } - } -} - -void -remote_list_randomize (struct remote_list *l) -{ - int i; - if (l) - { - for (i = 0; i < l->len; ++i) - { - const int j = get_random () % l->len; - if (i != j) - { - struct remote_entry tmp; - tmp = l->array[i]; - l->array[i] = l->array[j]; - l->array[j] = tmp; - } - } - } -} - -static const char * -remote_list_host (const struct remote_list *rl) -{ - if (rl) - return rl->array[rl->current].hostname; - else - return NULL; -} - -static int -remote_list_port (const struct remote_list *rl) -{ - if (rl) - return rl->array[rl->current].port; - else - return 0; -} - -/* - * SOCKET INITALIZATION CODE. - * Create a TCP/UDP socket - */ - -socket_descriptor_t -create_socket_tcp (void) -{ - socket_descriptor_t sd; - - if ((sd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) - msg (M_SOCKERR, "Cannot create TCP socket"); - - /* set SO_REUSEADDR on socket */ - { - int on = 1; - if (setsockopt (sd, SOL_SOCKET, SO_REUSEADDR, - (void *) &on, sizeof (on)) < 0) - msg (M_SOCKERR, "TCP: Cannot setsockopt SO_REUSEADDR on TCP socket"); - } - -#if 0 - /* set socket linger options */ - { - struct linger linger; - linger.l_onoff = 1; - linger.l_linger = 2; - if (setsockopt (sd, SOL_SOCKET, SO_LINGER, - (void *) &linger, sizeof (linger)) < 0) - msg (M_SOCKERR, "TCP: Cannot setsockopt SO_LINGER on TCP socket"); - } -#endif - - return sd; -} - -static socket_descriptor_t -create_socket_udp (void) -{ - socket_descriptor_t sd; - - if ((sd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) - msg (M_SOCKERR, "UDP: Cannot create UDP socket"); - return sd; -} - -static void -create_socket (struct link_socket *sock) -{ - /* create socket */ - if (sock->info.proto == PROTO_UDPv4) - { - sock->sd = create_socket_udp (); - -#ifdef ENABLE_SOCKS - if (sock->socks_proxy) - sock->ctrl_sd = create_socket_tcp (); -#endif - } - else if (sock->info.proto == PROTO_TCPv4_SERVER - || sock->info.proto == PROTO_TCPv4_CLIENT) - { - sock->sd = create_socket_tcp (); - } - else - { - ASSERT (0); - } -} - -/* - * Functions used for establishing a TCP stream connection. - */ - -static void -socket_do_listen (socket_descriptor_t sd, - const struct sockaddr_in *local, - bool do_listen, - bool do_set_nonblock) -{ - struct gc_arena gc = gc_new (); - if (do_listen) - { - msg (M_INFO, "Listening for incoming TCP connection on %s", - print_sockaddr (local, &gc)); - if (listen (sd, 1)) - msg (M_SOCKERR, "TCP: listen() failed"); - } - - /* set socket to non-blocking mode */ - if (do_set_nonblock) - set_nonblock (sd); - - gc_free (&gc); -} - -socket_descriptor_t -socket_do_accept (socket_descriptor_t sd, - struct sockaddr_in *remote, - const bool nowait) -{ - socklen_t remote_len = sizeof (*remote); - socket_descriptor_t new_sd = SOCKET_UNDEFINED; - -#ifdef HAVE_GETPEERNAME - if (nowait) - { - new_sd = getpeername (sd, (struct sockaddr *) remote, &remote_len); - - if (!socket_defined (new_sd)) - msg (D_LINK_ERRORS | M_ERRNO_SOCK, "TCP: getpeername() failed"); - else - new_sd = sd; - } -#else - if (nowait) - msg (M_WARN, "TCP: this OS does not provide the getpeername() function"); -#endif - else - { - new_sd = accept (sd, (struct sockaddr *) remote, &remote_len); - } - -#if 0 /* For debugging only, test the effect of accept() failures */ - { - static int foo = 0; - ++foo; - if (foo & 1) - new_sd = -1; - } -#endif - - if (!socket_defined (new_sd)) - { - msg (D_LINK_ERRORS | M_ERRNO_SOCK, "TCP: accept(%d) failed", sd); - } - else if (remote_len != sizeof (*remote)) - { - msg (D_LINK_ERRORS, "TCP: Received strange incoming connection with unknown address length=%d", remote_len); - openvpn_close_socket (new_sd); - new_sd = SOCKET_UNDEFINED; - } - return new_sd; -} - -static void -tcp_connection_established (const struct sockaddr_in *remote) -{ - struct gc_arena gc = gc_new (); - msg (M_INFO, "TCP connection established with %s", - print_sockaddr (remote, &gc)); - gc_free (&gc); -} - -static int -socket_listen_accept (socket_descriptor_t sd, - struct sockaddr_in *remote, - const char *remote_dynamic, - bool *remote_changed, - const struct sockaddr_in *local, - bool do_listen, - bool nowait, - volatile int *signal_received) -{ - struct gc_arena gc = gc_new (); - struct sockaddr_in remote_verify = *remote; - int new_sd = SOCKET_UNDEFINED; - - socket_do_listen (sd, local, do_listen, true); - - while (true) - { - int status; - fd_set reads; - struct timeval tv; - - FD_ZERO (&reads); - FD_SET (sd, &reads); - tv.tv_sec = 0; - tv.tv_usec = 0; - - status = select (sd + 1, &reads, NULL, NULL, &tv); - - get_signal (signal_received); - if (*signal_received) - { - gc_free (&gc); - return sd; - } - - if (status < 0) - msg (D_LINK_ERRORS | M_ERRNO_SOCK, "TCP: select() failed"); - - if (status <= 0) - { - openvpn_sleep (1); - continue; - } - - new_sd = socket_do_accept (sd, remote, nowait); - - if (socket_defined (new_sd)) - { - update_remote (remote_dynamic, &remote_verify, remote_changed); - if (addr_defined (&remote_verify) - && !addr_match (&remote_verify, remote)) - { - msg (M_WARN, - "TCP NOTE: Rejected connection attempt from %s due to --remote setting", - print_sockaddr (remote, &gc)); - if (openvpn_close_socket (new_sd)) - msg (M_SOCKERR, "TCP: close socket failed (new_sd)"); - } - else - break; - } - openvpn_sleep (1); - } - - if (!nowait && openvpn_close_socket (sd)) - msg (M_SOCKERR, "TCP: close socket failed (sd)"); - - tcp_connection_established (remote); - - gc_free (&gc); - return new_sd; -} - -static void -socket_connect (socket_descriptor_t *sd, - struct sockaddr_in *remote, - struct remote_list *remote_list, - const char *remote_dynamic, - bool *remote_changed, - const int connect_retry_seconds, - volatile int *signal_received) -{ - struct gc_arena gc = gc_new (); - - msg (M_INFO, "Attempting to establish TCP connection with %s", - print_sockaddr (remote, &gc)); - while (true) - { - const int status = connect (*sd, (struct sockaddr *) remote, - sizeof (*remote)); - - get_signal (signal_received); - if (*signal_received) - goto done; - - if (!status) - break; - - msg (D_LINK_ERRORS | M_ERRNO_SOCK, - "TCP: connect to %s failed, will try again in %d seconds", - print_sockaddr (remote, &gc), - connect_retry_seconds); - - openvpn_close_socket (*sd); - openvpn_sleep (connect_retry_seconds); - - if (remote_list) - { - remote_list_next (remote_list); - remote_dynamic = remote_list_host (remote_list); - remote->sin_port = htons (remote_list_port (remote_list)); - *remote_changed = true; - } - - *sd = create_socket_tcp (); - update_remote (remote_dynamic, remote, remote_changed); - } - - msg (M_INFO, "TCP connection established with %s", - print_sockaddr (remote, &gc)); - - done: - gc_free (&gc); -} - -/* For stream protocols, allocate a buffer to build up packet. - Called after frame has been finalized. */ - -static void -socket_frame_init (const struct frame *frame, struct link_socket *sock) -{ -#ifdef WIN32 - overlapped_io_init (&sock->reads, frame, FALSE, false); - overlapped_io_init (&sock->writes, frame, TRUE, false); - sock->rw_handle.read = sock->reads.overlapped.hEvent; - sock->rw_handle.write = sock->writes.overlapped.hEvent; -#endif - - if (link_socket_connection_oriented (sock)) - { -#ifdef WIN32 - stream_buf_init (&sock->stream_buf, &sock->reads.buf_init); -#else - alloc_buf_sock_tun (&sock->stream_buf_data, - frame, - false, - FRAME_HEADROOM_MARKER_READ_STREAM); - stream_buf_init (&sock->stream_buf, &sock->stream_buf_data); -#endif - } -} - -/* - * Adjust frame structure based on a Path MTU value given - * to us by the OS. - */ -void -frame_adjust_path_mtu (struct frame *frame, int pmtu, int proto) -{ - frame_set_mtu_dynamic (frame, pmtu - datagram_overhead (proto), SET_MTU_UPPER_BOUND); -} - -static void -resolve_bind_local (struct link_socket *sock) -{ - struct gc_arena gc = gc_new (); - - /* resolve local address if undefined */ - if (!addr_defined (&sock->info.lsa->local)) - { - sock->info.lsa->local.sin_family = AF_INET; - sock->info.lsa->local.sin_addr.s_addr = - (sock->local_host ? getaddr (GETADDR_RESOLVE | GETADDR_WARN_ON_SIGNAL | GETADDR_FATAL, - sock->local_host, - 0, - NULL, - NULL) - : htonl (INADDR_ANY)); - sock->info.lsa->local.sin_port = htons (sock->local_port); - } - - /* bind to local address/port */ - if (sock->bind_local) - { - if (bind (sock->sd, (struct sockaddr *) &sock->info.lsa->local, - sizeof (sock->info.lsa->local))) - { - const int errnum = openvpn_errno_socket (); - msg (M_FATAL, "TCP/UDP: Socket bind failed on local address %s: %s", - print_sockaddr (&sock->info.lsa->local, &gc), - strerror_ts (errnum, &gc)); - } - } - gc_free (&gc); -} - -static void -resolve_remote (struct link_socket *sock, - int phase, - const char **remote_dynamic, - volatile int *signal_received) -{ - struct gc_arena gc = gc_new (); - - if (!sock->did_resolve_remote) - { - /* resolve remote address if undefined */ - if (!addr_defined (&sock->info.lsa->remote)) - { - sock->info.lsa->remote.sin_family = AF_INET; - sock->info.lsa->remote.sin_addr.s_addr = 0; - - if (sock->remote_host) - { - unsigned int flags = 0; - int retry = 0; - bool status = false; - - if (remote_list_len (sock->remote_list) > 1 && sock->resolve_retry_seconds == RESOLV_RETRY_INFINITE) - { - flags = GETADDR_RESOLVE; - if (phase == 2) - flags |= (GETADDR_TRY_ONCE | GETADDR_FATAL); - retry = 0; - } - else if (phase == 1) - { - if (sock->resolve_retry_seconds) - { - flags = GETADDR_RESOLVE; - retry = 0; - } - else - { - flags = GETADDR_RESOLVE | GETADDR_FATAL | GETADDR_MENTION_RESOLVE_RETRY; - retry = 0; - } - } - else if (phase == 2) - { - if (sock->resolve_retry_seconds) - { - flags = GETADDR_RESOLVE | GETADDR_FATAL; - retry = sock->resolve_retry_seconds; - } - else - { - ASSERT (0); - } - } - else - { - ASSERT (0); - } - - sock->info.lsa->remote.sin_addr.s_addr = getaddr ( - flags, - sock->remote_host, - retry, - &status, - signal_received); - - dmsg (D_SOCKET_DEBUG, "RESOLVE_REMOTE flags=0x%04x phase=%d rrs=%d sig=%d status=%d", - flags, - phase, - retry, - signal_received ? *signal_received : -1, - status); - - if (signal_received) - { - if (*signal_received) - goto done; - } - if (!status) - { - if (signal_received) - *signal_received = SIGUSR1; - goto done; - } - } - - sock->info.lsa->remote.sin_port = htons (sock->remote_port); - } - - /* should we re-use previous active remote address? */ - if (addr_defined (&sock->info.lsa->actual)) - { - msg (M_INFO, "TCP/UDP: Preserving recently used remote address: %s", - print_sockaddr (&sock->info.lsa->actual, &gc)); - if (remote_dynamic) - *remote_dynamic = NULL; - } - else - sock->info.lsa->actual = sock->info.lsa->remote; - - /* remember that we finished */ - sock->did_resolve_remote = true; - } - - done: - gc_free (&gc); -} - -struct link_socket * -link_socket_new (void) -{ - struct link_socket *sock; - - ALLOC_OBJ_CLEAR (sock, struct link_socket); - sock->sd = SOCKET_UNDEFINED; -#ifdef ENABLE_SOCKS - sock->ctrl_sd = SOCKET_UNDEFINED; -#endif - return sock; -} - -/* bind socket if necessary */ -void -link_socket_init_phase1 (struct link_socket *sock, - const char *local_host, - struct remote_list *remote_list, - int local_port, - int proto, - int mode, - const struct link_socket *accept_from, -#ifdef ENABLE_HTTP_PROXY - struct http_proxy_info *http_proxy, -#endif -#ifdef ENABLE_SOCKS - struct socks_proxy_info *socks_proxy, -#endif -#ifdef ENABLE_DEBUG - int gremlin, -#endif - bool bind_local, - bool remote_float, - int inetd, - struct link_socket_addr *lsa, - const char *ipchange_command, - const struct plugin_list *plugins, - int resolve_retry_seconds, - int connect_retry_seconds, - int mtu_discover_type, - int rcvbuf, - int sndbuf) -{ - const char *remote_host; - int remote_port; - - ASSERT (sock); - - sock->remote_list = remote_list; - remote_list_next (remote_list); - remote_host = remote_list_host (remote_list); - remote_port = remote_list_port (remote_list); - - sock->local_host = local_host; - sock->local_port = local_port; - -#ifdef ENABLE_HTTP_PROXY - sock->http_proxy = http_proxy; -#endif - -#ifdef ENABLE_SOCKS - sock->socks_proxy = socks_proxy; -#endif - - sock->bind_local = bind_local; - sock->inetd = inetd; - sock->resolve_retry_seconds = resolve_retry_seconds; - sock->connect_retry_seconds = connect_retry_seconds; - sock->mtu_discover_type = mtu_discover_type; - -#ifdef ENABLE_DEBUG - sock->gremlin = gremlin; -#endif - - sock->socket_buffer_sizes.rcvbuf = rcvbuf; - sock->socket_buffer_sizes.sndbuf = sndbuf; - - sock->info.proto = proto; - sock->info.remote_float = remote_float; - sock->info.lsa = lsa; - sock->info.ipchange_command = ipchange_command; - sock->info.plugins = plugins; - - sock->mode = mode; - if (mode == LS_MODE_TCP_ACCEPT_FROM) - { - ASSERT (accept_from); - ASSERT (sock->info.proto == PROTO_TCPv4_SERVER); - ASSERT (!sock->inetd); - sock->sd = accept_from->sd; - } - - if (false) - ; -#ifdef ENABLE_HTTP_PROXY - /* are we running in HTTP proxy mode? */ - else if (sock->http_proxy) - { - ASSERT (sock->info.proto == PROTO_TCPv4_CLIENT); - ASSERT (!sock->inetd); - - /* the proxy server */ - sock->remote_host = http_proxy->options.server; - sock->remote_port = http_proxy->options.port; - - /* the OpenVPN server we will use the proxy to connect to */ - sock->proxy_dest_host = remote_host; - sock->proxy_dest_port = remote_port; - - /* this is needed so that connection retries will go to the proxy server, - not the remote OpenVPN address */ - sock->remote_list = NULL; - } -#endif -#ifdef ENABLE_SOCKS - /* or in Socks proxy mode? */ - else if (sock->socks_proxy) - { - ASSERT (sock->info.proto == PROTO_TCPv4_CLIENT || sock->info.proto == PROTO_UDPv4); - ASSERT (!sock->inetd); - - /* the proxy server */ - sock->remote_host = socks_proxy->server; - sock->remote_port = socks_proxy->port; - - /* the OpenVPN server we will use the proxy to connect to */ - sock->proxy_dest_host = remote_host; - sock->proxy_dest_port = remote_port; - - /* this is needed so that connection retries will go to the proxy server, - not the remote OpenVPN address */ - sock->remote_list = NULL; - } -#endif - else - { - sock->remote_host = remote_host; - sock->remote_port = remote_port; - } - - /* bind behavior for TCP server vs. client */ - if (sock->info.proto == PROTO_TCPv4_SERVER) - { - if (sock->mode == LS_MODE_TCP_ACCEPT_FROM) - sock->bind_local = false; - else - sock->bind_local = true; - } - else if (sock->info.proto == PROTO_TCPv4_CLIENT) - { - sock->bind_local = false; - } - - /* were we started by inetd or xinetd? */ - if (sock->inetd) - { - ASSERT (sock->info.proto != PROTO_TCPv4_CLIENT); - ASSERT (socket_defined (inetd_socket_descriptor)); - sock->sd = inetd_socket_descriptor; - } - else if (mode != LS_MODE_TCP_ACCEPT_FROM) - { - create_socket (sock); - resolve_bind_local (sock); - resolve_remote (sock, 1, NULL, NULL); - } -} - -/* finalize socket initialization */ -void -link_socket_init_phase2 (struct link_socket *sock, - const struct frame *frame, - volatile int *signal_received) -{ - struct gc_arena gc = gc_new (); - const char *remote_dynamic = NULL; - bool remote_changed = false; - int sig_save = 0; - - ASSERT (sock); - - if (signal_received && *signal_received) - { - sig_save = *signal_received; - *signal_received = 0; - } - - /* initialize buffers */ - socket_frame_init (frame, sock); - - /* - * Pass a remote name to connect/accept so that - * they can test for dynamic IP address changes - * and throw a SIGUSR1 if appropriate. - */ - if (sock->resolve_retry_seconds) - remote_dynamic = sock->remote_host; - - /* were we started by inetd or xinetd? */ - if (sock->inetd) - { - if (sock->info.proto == PROTO_TCPv4_SERVER) - sock->sd = - socket_listen_accept (sock->sd, - &sock->info.lsa->actual, - remote_dynamic, - &remote_changed, - &sock->info.lsa->local, - false, - sock->inetd == INETD_NOWAIT, - signal_received); - ASSERT (!remote_changed); - if (*signal_received) - goto done; - } - else - { - resolve_remote (sock, 2, &remote_dynamic, signal_received); - - if (*signal_received) - goto done; - - /* TCP client/server */ - if (sock->info.proto == PROTO_TCPv4_SERVER) - { - switch (sock->mode) - { - case LS_MODE_DEFAULT: - sock->sd = socket_listen_accept (sock->sd, - &sock->info.lsa->actual, - remote_dynamic, - &remote_changed, - &sock->info.lsa->local, - true, - false, - signal_received); - break; - case LS_MODE_TCP_LISTEN: - socket_do_listen (sock->sd, - &sock->info.lsa->local, - true, - false); - break; - case LS_MODE_TCP_ACCEPT_FROM: - sock->sd = socket_do_accept (sock->sd, - &sock->info.lsa->actual, - false); - if (!socket_defined (sock->sd)) - { - *signal_received = SIGTERM; - goto done; - } - tcp_connection_established (&sock->info.lsa->actual); - break; - default: - ASSERT (0); - } - } - else if (sock->info.proto == PROTO_TCPv4_CLIENT) - { - socket_connect (&sock->sd, - &sock->info.lsa->actual, - sock->remote_list, - remote_dynamic, - &remote_changed, - sock->connect_retry_seconds, - signal_received); - - if (*signal_received) - goto done; - - if (false) - ; -#ifdef ENABLE_HTTP_PROXY - else if (sock->http_proxy) - { - establish_http_proxy_passthru (sock->http_proxy, - sock->sd, - sock->proxy_dest_host, - sock->proxy_dest_port, - &sock->stream_buf.residual, - signal_received); - } -#endif -#ifdef ENABLE_SOCKS - else if (sock->socks_proxy) - { - establish_socks_proxy_passthru (sock->socks_proxy, - sock->sd, - sock->proxy_dest_host, - sock->proxy_dest_port, - signal_received); - } -#endif - } -#ifdef ENABLE_SOCKS - else if (sock->info.proto == PROTO_UDPv4 && sock->socks_proxy) - { - socket_connect (&sock->ctrl_sd, - &sock->info.lsa->actual, - NULL, - remote_dynamic, - &remote_changed, - sock->connect_retry_seconds, - signal_received); - - if (*signal_received) - goto done; - - establish_socks_proxy_udpassoc (sock->socks_proxy, - sock->ctrl_sd, - sock->sd, &sock->socks_relay, - signal_received); - - if (*signal_received) - goto done; - - sock->remote_host = sock->proxy_dest_host; - sock->remote_port = sock->proxy_dest_port; - sock->did_resolve_remote = false; - sock->info.lsa->actual.sin_addr.s_addr = 0; - sock->info.lsa->remote.sin_addr.s_addr = 0; - - resolve_remote (sock, 1, NULL, signal_received); - - if (*signal_received) - goto done; - } -#endif - - if (*signal_received) - goto done; - - if (remote_changed) - { - msg (M_INFO, "TCP/UDP: Dynamic remote address changed during TCP connection establishment"); - sock->info.lsa->remote.sin_addr.s_addr = sock->info.lsa->actual.sin_addr.s_addr; - } - } - - /* set socket buffers based on --sndbuf and --rcvbuf options */ - socket_set_buffers (sock->sd, &sock->socket_buffer_sizes); - - /* set socket to non-blocking mode */ - set_nonblock (sock->sd); - - /* set socket file descriptor to not pass across execs, so that - scripts don't have access to it */ - set_cloexec (sock->sd); - -#ifdef ENABLE_SOCKS - if (socket_defined (sock->ctrl_sd)) - set_cloexec (sock->ctrl_sd); -#endif - - /* set Path MTU discovery options on the socket */ - set_mtu_discover_type (sock->sd, sock->mtu_discover_type); - -#if EXTENDED_SOCKET_ERROR_CAPABILITY - /* if the OS supports it, enable extended error passing on the socket */ - set_sock_extended_error_passing (sock->sd); -#endif - - /* print local address */ - if (sock->inetd) - msg (M_INFO, "%s link local: [inetd]", proto2ascii (sock->info.proto, true)); - else - msg (M_INFO, "%s link local%s: %s", - proto2ascii (sock->info.proto, true), - (sock->bind_local ? " (bound)" : ""), - print_sockaddr_ex (&sock->info.lsa->local, sock->bind_local, ":", &gc)); - - /* print active remote address */ - msg (M_INFO, "%s link remote: %s", - proto2ascii (sock->info.proto, true), - print_sockaddr_ex (&sock->info.lsa->actual, addr_defined (&sock->info.lsa->actual), ":", &gc)); - - done: - if (sig_save && signal_received) - { - if (!*signal_received) - *signal_received = sig_save; - } - gc_free (&gc); -} - -void -link_socket_close (struct link_socket *sock) -{ - if (sock) - { -#ifdef ENABLE_DEBUG - const int gremlin = GREMLIN_CONNECTION_FLOOD_LEVEL (sock->gremlin); -#else - const int gremlin = 0; -#endif - - if (socket_defined (sock->sd)) - { -#ifdef WIN32 - close_net_event_win32 (&sock->listen_handle, sock->sd, 0); -#endif - if (!gremlin) - { - msg (D_CLOSE, "TCP/UDP: Closing socket"); - if (openvpn_close_socket (sock->sd)) - msg (M_WARN | M_ERRNO_SOCK, "TCP/UDP: Close Socket failed"); - } - sock->sd = SOCKET_UNDEFINED; -#ifdef WIN32 - if (!gremlin) - { - overlapped_io_close (&sock->reads); - overlapped_io_close (&sock->writes); - } -#endif - } - -#ifdef ENABLE_SOCKS - if (socket_defined (sock->ctrl_sd)) - { - if (openvpn_close_socket (sock->ctrl_sd)) - msg (M_WARN | M_ERRNO_SOCK, "TCP/UDP: Close Socket (ctrl_sd) failed"); - sock->ctrl_sd = SOCKET_UNDEFINED; - } -#endif - - stream_buf_close (&sock->stream_buf); - free_buf (&sock->stream_buf_data); - if (!gremlin) - free (sock); - } -} - -/* for stream protocols, allow for packet length prefix */ -void -socket_adjust_frame_parameters (struct frame *frame, int proto) -{ - if (link_socket_proto_connection_oriented (proto)) - frame_add_to_extra_frame (frame, sizeof (packet_size_type)); -} - -void -setenv_trusted (struct env_set *es, const struct link_socket_info *info) -{ - setenv_sockaddr (es, "trusted", &info->lsa->actual, SA_IP_PORT); -} - -void -link_socket_connection_initiated (const struct buffer *buf, - struct link_socket_info *info, - const struct sockaddr_in *addr, - const char *common_name, - struct env_set *es) -{ - struct gc_arena gc = gc_new (); - - info->lsa->actual = *addr; /* Note: skip this line for --force-dest */ - setenv_trusted (es, info); - info->connection_established = true; - - /* Print connection initiated message, with common name if available */ - { - struct buffer out = alloc_buf_gc (256, &gc); - if (common_name) - buf_printf (&out, "[%s] ", common_name); - buf_printf (&out, "Peer Connection Initiated with %s", print_sockaddr (&info->lsa->actual, &gc)); - msg (M_INFO, "%s", BSTR (&out)); - } - - /* set environmental vars */ - setenv_str (es, "common_name", common_name); - - /* Process --ipchange plugin */ - if (plugin_defined (info->plugins, OPENVPN_PLUGIN_IPCHANGE)) - { - const char *addr_ascii = print_sockaddr_ex (&info->lsa->actual, true, " ", &gc); - if (plugin_call (info->plugins, OPENVPN_PLUGIN_IPCHANGE, addr_ascii, es)) - msg (M_WARN, "WARNING: ipchange plugin call failed"); - } - - /* Process --ipchange option */ - if (info->ipchange_command) - { - struct buffer out = alloc_buf_gc (256, &gc); - setenv_str (es, "script_type", "ipchange"); - buf_printf (&out, "%s %s", - info->ipchange_command, - print_sockaddr_ex (&info->lsa->actual, true, " ", &gc)); - system_check (BSTR (&out), es, S_SCRIPT, "ip-change command failed"); - } - - gc_free (&gc); -} - -void -link_socket_bad_incoming_addr (struct buffer *buf, - const struct link_socket_info *info, - const struct sockaddr_in *from_addr) -{ - struct gc_arena gc = gc_new (); - - msg (D_LINK_ERRORS, - "TCP/UDP: Incoming packet rejected from %s[%d], expected peer address: %s (allow this incoming source address/port by removing --remote or adding --float)", - print_sockaddr (from_addr, &gc), - (int)from_addr->sin_family, - print_sockaddr (&info->lsa->remote, &gc)); - buf->len = 0; - - gc_free (&gc); -} - -void -link_socket_bad_outgoing_addr (void) -{ - dmsg (D_READ_WRITE, "TCP/UDP: No outgoing address to send packet"); -} - -in_addr_t -link_socket_current_remote (const struct link_socket_info *info) -{ - const struct link_socket_addr *lsa = info->lsa; - - if (addr_defined (&lsa->actual)) - return ntohl (lsa->actual.sin_addr.s_addr); - else if (addr_defined (&lsa->remote)) - return ntohl (lsa->remote.sin_addr.s_addr); - else - return 0; -} - -/* - * Return a status string describing socket state. - */ -const char * -socket_stat (const struct link_socket *s, unsigned int rwflags, struct gc_arena *gc) -{ - struct buffer out = alloc_buf_gc (64, gc); - if (s) - { - if (rwflags & EVENT_READ) - { - buf_printf (&out, "S%s", - (s->rwflags_debug & EVENT_READ) ? "R" : "r"); -#ifdef WIN32 - buf_printf (&out, "%s", - overlapped_io_state_ascii (&s->reads)); -#endif - } - if (rwflags & EVENT_WRITE) - { - buf_printf (&out, "S%s", - (s->rwflags_debug & EVENT_WRITE) ? "W" : "w"); -#ifdef WIN32 - buf_printf (&out, "%s", - overlapped_io_state_ascii (&s->writes)); -#endif - } - } - else - { - buf_printf (&out, "S?"); - } - return BSTR (&out); -} - -/* - * Stream buffer functions, used to packetize a TCP - * stream connection. - */ - -static inline void -stream_buf_reset (struct stream_buf *sb) -{ - dmsg (D_STREAM_DEBUG, "STREAM: RESET"); - sb->residual_fully_formed = false; - sb->buf = sb->buf_init; - buf_reset (&sb->next); - sb->len = -1; -} - -void -stream_buf_init (struct stream_buf *sb, - struct buffer *buf) -{ - sb->buf_init = *buf; - sb->maxlen = sb->buf_init.len; - sb->buf_init.len = 0; - sb->residual = alloc_buf (sb->maxlen); - sb->error = false; - stream_buf_reset (sb); - - dmsg (D_STREAM_DEBUG, "STREAM: INIT maxlen=%d", sb->maxlen); -} - -static inline void -stream_buf_set_next (struct stream_buf *sb) -{ - /* set up 'next' for next i/o read */ - sb->next = sb->buf; - sb->next.offset = sb->buf.offset + sb->buf.len; - sb->next.len = (sb->len >= 0 ? sb->len : sb->maxlen) - sb->buf.len; - dmsg (D_STREAM_DEBUG, "STREAM: SET NEXT, buf=[%d,%d] next=[%d,%d] len=%d maxlen=%d", - sb->buf.offset, sb->buf.len, - sb->next.offset, sb->next.len, - sb->len, sb->maxlen); - ASSERT (sb->next.len > 0); - ASSERT (buf_safe (&sb->buf, sb->next.len)); -} - -static inline void -stream_buf_get_final (struct stream_buf *sb, struct buffer *buf) -{ - dmsg (D_STREAM_DEBUG, "STREAM: GET FINAL len=%d", - buf_defined (&sb->buf) ? sb->buf.len : -1); - ASSERT (buf_defined (&sb->buf)); - *buf = sb->buf; -} - -static inline void -stream_buf_get_next (struct stream_buf *sb, struct buffer *buf) -{ - dmsg (D_STREAM_DEBUG, "STREAM: GET NEXT len=%d", - buf_defined (&sb->next) ? sb->next.len : -1); - ASSERT (buf_defined (&sb->next)); - *buf = sb->next; -} - -bool -stream_buf_read_setup_dowork (struct link_socket* sock) -{ - if (sock->stream_buf.residual.len && !sock->stream_buf.residual_fully_formed) - { - ASSERT (buf_copy (&sock->stream_buf.buf, &sock->stream_buf.residual)); - ASSERT (buf_init (&sock->stream_buf.residual, 0)); - sock->stream_buf.residual_fully_formed = stream_buf_added (&sock->stream_buf, 0); - dmsg (D_STREAM_DEBUG, "STREAM: RESIDUAL FULLY FORMED [%s], len=%d", - sock->stream_buf.residual_fully_formed ? "YES" : "NO", - sock->stream_buf.residual.len); - } - - if (!sock->stream_buf.residual_fully_formed) - stream_buf_set_next (&sock->stream_buf); - return !sock->stream_buf.residual_fully_formed; -} - -bool -stream_buf_added (struct stream_buf *sb, - int length_added) -{ - dmsg (D_STREAM_DEBUG, "STREAM: ADD length_added=%d", length_added); - if (length_added > 0) - sb->buf.len += length_added; - - /* if length unknown, see if we can get the length prefix from - the head of the buffer */ - if (sb->len < 0 && sb->buf.len >= (int) sizeof (packet_size_type)) - { - packet_size_type net_size; - ASSERT (buf_read (&sb->buf, &net_size, sizeof (net_size))); - sb->len = ntohps (net_size); - - if (sb->len < 1 || sb->len > sb->maxlen) - { - msg (M_WARN, "WARNING: Bad encapsulated packet length from peer (%d), which must be > 0 and <= %d -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attemping restart...]", sb->len, sb->maxlen); - stream_buf_reset (sb); - sb->error = true; - return false; - } - } - - /* is our incoming packet fully read? */ - if (sb->len > 0 && sb->buf.len >= sb->len) - { - /* save any residual data that's part of the next packet */ - ASSERT (buf_init (&sb->residual, 0)); - if (sb->buf.len > sb->len) - ASSERT (buf_copy_excess (&sb->residual, &sb->buf, sb->len)); - dmsg (D_STREAM_DEBUG, "STREAM: ADD returned TRUE, buf_len=%d, residual_len=%d", - BLEN (&sb->buf), - BLEN (&sb->residual)); - return true; - } - else - { - dmsg (D_STREAM_DEBUG, "STREAM: ADD returned FALSE (have=%d need=%d)", sb->buf.len, sb->len); - stream_buf_set_next (sb); - return false; - } -} - -void -stream_buf_close (struct stream_buf* sb) -{ - free_buf (&sb->residual); -} - -/* - * The listen event is a special event whose sole purpose is - * to tell us that there's a new incoming connection on a - * TCP socket, for use in server mode. - */ -event_t -socket_listen_event_handle (struct link_socket *s) -{ -#ifdef WIN32 - if (!defined_net_event_win32 (&s->listen_handle)) - init_net_event_win32 (&s->listen_handle, FD_ACCEPT, s->sd, 0); - return &s->listen_handle; -#else - return s->sd; -#endif -} - -/* - * Format IP addresses in ascii - */ - -const char * -print_sockaddr (const struct sockaddr_in *addr, struct gc_arena *gc) -{ - return print_sockaddr_ex(addr, true, ":", gc); -} - -const char * -print_sockaddr_ex (const struct sockaddr_in *addr, bool do_port, const char* separator, struct gc_arena *gc) -{ - struct buffer out = alloc_buf_gc (64, gc); - const int port = ntohs (addr->sin_port); - - mutex_lock_static (L_INET_NTOA); - buf_printf (&out, "%s", (addr_defined (addr) ? inet_ntoa (addr->sin_addr) : "[undef]")); - mutex_unlock_static (L_INET_NTOA); - - if (do_port && port) - { - if (separator) - buf_printf (&out, "%s", separator); - - buf_printf (&out, "%d", port); - } - return BSTR (&out); -} - -/* - * Convert an in_addr_t in host byte order - * to an ascii dotted quad. - */ -const char * -print_in_addr_t (in_addr_t addr, unsigned int flags, struct gc_arena *gc) -{ - struct in_addr ia; - struct buffer out = alloc_buf_gc (64, gc); - - if (addr || !(flags & IA_EMPTY_IF_UNDEF)) - { - CLEAR (ia); - ia.s_addr = (flags & IA_NET_ORDER) ? addr : htonl (addr); - - mutex_lock_static (L_INET_NTOA); - buf_printf (&out, "%s", inet_ntoa (ia)); - mutex_unlock_static (L_INET_NTOA); - } - return BSTR (&out); -} - -/* set environmental variables for ip/port in *addr */ -void -setenv_sockaddr (struct env_set *es, const char *name_prefix, const struct sockaddr_in *addr, const bool flags) -{ - char name_buf[256]; - - if (flags & SA_IP_PORT) - openvpn_snprintf (name_buf, sizeof (name_buf), "%s_ip", name_prefix); - else - openvpn_snprintf (name_buf, sizeof (name_buf), "%s", name_prefix); - - mutex_lock_static (L_INET_NTOA); - setenv_str (es, name_buf, inet_ntoa (addr->sin_addr)); - mutex_unlock_static (L_INET_NTOA); - - if ((flags & SA_IP_PORT) && addr->sin_port) - { - openvpn_snprintf (name_buf, sizeof (name_buf), "%s_port", name_prefix); - setenv_int (es, name_buf, ntohs (addr->sin_port)); - } -} - -void -setenv_in_addr_t (struct env_set *es, const char *name_prefix, in_addr_t addr, const bool flags) -{ - if (addr || !(flags & SA_SET_IF_NONZERO)) - { - struct sockaddr_in si; - CLEAR (si); - si.sin_addr.s_addr = htonl (addr); - setenv_sockaddr (es, name_prefix, &si, flags); - } -} - -/* - * Convert protocol names between index and ascii form. - */ - -struct proto_names { - const char *short_form; - const char *display_form; -}; - -/* Indexed by PROTO_x */ -static const struct proto_names proto_names[] = { - {"udp", "UDPv4"}, - {"tcp-server", "TCPv4_SERVER"}, - {"tcp-client", "TCPv4_CLIENT"}, - {"tcp", "TCPv4"} -}; - -int -ascii2proto (const char* proto_name) -{ - int i; - ASSERT (PROTO_N == SIZE (proto_names)); - for (i = 0; i < PROTO_N; ++i) - if (!strcmp (proto_name, proto_names[i].short_form)) - return i; - return -1; -} - -const char * -proto2ascii (int proto, bool display_form) -{ - ASSERT (PROTO_N == SIZE (proto_names)); - if (proto < 0 || proto >= PROTO_N) - return "[unknown protocol]"; - else if (display_form) - return proto_names[proto].display_form; - else - return proto_names[proto].short_form; -} - -const char * -proto2ascii_all (struct gc_arena *gc) -{ - struct buffer out = alloc_buf_gc (256, gc); - int i; - - ASSERT (PROTO_N == SIZE (proto_names)); - for (i = 0; i < PROTO_N; ++i) - { - if (i) - buf_printf(&out, " "); - buf_printf(&out, "[%s]", proto2ascii(i, false)); - } - return BSTR (&out); -} - -/* - * Given a local proto, return local proto - * if !remote, or compatible remote proto - * if remote. - * - * This is used for options compatibility - * checking. - */ -int -proto_remote (int proto, bool remote) -{ - ASSERT (proto >= 0 && proto < PROTO_N); - if (remote) - { - if (proto == PROTO_TCPv4_SERVER) - return PROTO_TCPv4_CLIENT; - if (proto == PROTO_TCPv4_CLIENT) - return PROTO_TCPv4_SERVER; - } - return proto; -} - -/* - * Bad incoming address lengths that differ from what - * we expect are considered to be fatal errors. - */ -void -bad_address_length (int actual, int expected) -{ - msg (M_FATAL, "ERROR: received strange incoming packet with an address length of %d -- we only accept address lengths of %d.", - actual, - expected); -} - -/* - * Socket Read Routines - */ - -int -link_socket_read_tcp (struct link_socket *sock, - struct buffer *buf) -{ - int len = 0; - - if (!sock->stream_buf.residual_fully_formed) - { -#ifdef WIN32 - len = socket_finalize (sock->sd, &sock->reads, buf, NULL); -#else - struct buffer frag; - stream_buf_get_next (&sock->stream_buf, &frag); - len = recv (sock->sd, BPTR (&frag), BLEN (&frag), MSG_NOSIGNAL); -#endif - - if (!len) - sock->stream_reset = true; - if (len <= 0) - return buf->len = len; - } - - if (sock->stream_buf.residual_fully_formed - || stream_buf_added (&sock->stream_buf, len)) /* packet complete? */ - { - stream_buf_get_final (&sock->stream_buf, buf); - stream_buf_reset (&sock->stream_buf); - return buf->len; - } - else - return buf->len = 0; /* no error, but packet is still incomplete */ -} - -#ifndef WIN32 - -int -link_socket_read_udp_posix (struct link_socket *sock, - struct buffer *buf, - int maxsize, - struct sockaddr_in *from) -{ - socklen_t fromlen = sizeof (*from); - CLEAR (*from); - ASSERT (buf_safe (buf, maxsize)); - buf->len = recvfrom (sock->sd, BPTR (buf), maxsize, 0, - (struct sockaddr *) from, &fromlen); - if (fromlen != sizeof (*from)) - bad_address_length (fromlen, sizeof (*from)); - return buf->len; -} - -#endif - -/* - * Socket Write Routines - */ - -int -link_socket_write_tcp (struct link_socket *sock, - struct buffer *buf, - struct sockaddr_in *to) -{ - packet_size_type len = BLEN (buf); - dmsg (D_STREAM_DEBUG, "STREAM: WRITE %d offset=%d", (int)len, buf->offset); - ASSERT (len <= sock->stream_buf.maxlen); - len = htonps (len); - ASSERT (buf_write_prepend (buf, &len, sizeof (len))); -#ifdef WIN32 - return link_socket_write_win32 (sock, buf, to); -#else - return link_socket_write_tcp_posix (sock, buf, to); -#endif -} - -/* - * Win32 overlapped socket I/O functions. - */ - -#ifdef WIN32 - -int -socket_recv_queue (struct link_socket *sock, int maxsize) -{ - if (sock->reads.iostate == IOSTATE_INITIAL) - { - WSABUF wsabuf[1]; - int status; - - /* reset buf to its initial state */ - if (sock->info.proto == PROTO_UDPv4) - { - sock->reads.buf = sock->reads.buf_init; - } - else if (sock->info.proto == PROTO_TCPv4_CLIENT || sock->info.proto == PROTO_TCPv4_SERVER) - { - stream_buf_get_next (&sock->stream_buf, &sock->reads.buf); - } - else - { - ASSERT (0); - } - - /* Win32 docs say it's okay to allocate the wsabuf on the stack */ - wsabuf[0].buf = BPTR (&sock->reads.buf); - wsabuf[0].len = maxsize ? maxsize : BLEN (&sock->reads.buf); - - /* check for buffer overflow */ - ASSERT (wsabuf[0].len <= BLEN (&sock->reads.buf)); - - /* the overlapped read will signal this event on I/O completion */ - ASSERT (ResetEvent (sock->reads.overlapped.hEvent)); - sock->reads.flags = 0; - - if (sock->info.proto == PROTO_UDPv4) - { - sock->reads.addr_defined = true; - sock->reads.addrlen = sizeof (sock->reads.addr); - status = WSARecvFrom( - sock->sd, - wsabuf, - 1, - &sock->reads.size, - &sock->reads.flags, - (struct sockaddr *) &sock->reads.addr, - &sock->reads.addrlen, - &sock->reads.overlapped, - NULL); - } - else if (sock->info.proto == PROTO_TCPv4_CLIENT || sock->info.proto == PROTO_TCPv4_SERVER) - { - sock->reads.addr_defined = false; - status = WSARecv( - sock->sd, - wsabuf, - 1, - &sock->reads.size, - &sock->reads.flags, - &sock->reads.overlapped, - NULL); - } - else - { - status = 0; - ASSERT (0); - } - - if (!status) /* operation completed immediately? */ - { - if (sock->reads.addr_defined && sock->reads.addrlen != sizeof (sock->reads.addr)) - bad_address_length (sock->reads.addrlen, sizeof (sock->reads.addr)); - - sock->reads.iostate = IOSTATE_IMMEDIATE_RETURN; - - /* since we got an immediate return, we must signal the event object ourselves */ - ASSERT (SetEvent (sock->reads.overlapped.hEvent)); - sock->reads.status = 0; - - dmsg (D_WIN32_IO, "WIN32 I/O: Socket Receive immediate return [%d,%d]", - (int) wsabuf[0].len, - (int) sock->reads.size); - } - else - { - status = WSAGetLastError (); - if (status == WSA_IO_PENDING) /* operation queued? */ - { - sock->reads.iostate = IOSTATE_QUEUED; - sock->reads.status = status; - dmsg (D_WIN32_IO, "WIN32 I/O: Socket Receive queued [%d]", - (int) wsabuf[0].len); - } - else /* error occurred */ - { - struct gc_arena gc = gc_new (); - ASSERT (SetEvent (sock->reads.overlapped.hEvent)); - sock->reads.iostate = IOSTATE_IMMEDIATE_RETURN; - sock->reads.status = status; - dmsg (D_WIN32_IO, "WIN32 I/O: Socket Receive error [%d]: %s", - (int) wsabuf[0].len, - strerror_win32 (status, &gc)); - gc_free (&gc); - } - } - } - return sock->reads.iostate; -} - -int -socket_send_queue (struct link_socket *sock, struct buffer *buf, const struct sockaddr_in *to) -{ - if (sock->writes.iostate == IOSTATE_INITIAL) - { - WSABUF wsabuf[1]; - int status; - - /* make a private copy of buf */ - sock->writes.buf = sock->writes.buf_init; - sock->writes.buf.len = 0; - ASSERT (buf_copy (&sock->writes.buf, buf)); - - /* Win32 docs say it's okay to allocate the wsabuf on the stack */ - wsabuf[0].buf = BPTR (&sock->writes.buf); - wsabuf[0].len = BLEN (&sock->writes.buf); - - /* the overlapped write will signal this event on I/O completion */ - ASSERT (ResetEvent (sock->writes.overlapped.hEvent)); - sock->writes.flags = 0; - - if (sock->info.proto == PROTO_UDPv4) - { - /* set destination address for UDP writes */ - sock->writes.addr_defined = true; - sock->writes.addr = *to; - sock->writes.addrlen = sizeof (sock->writes.addr); - - status = WSASendTo( - sock->sd, - wsabuf, - 1, - &sock->writes.size, - sock->writes.flags, - (struct sockaddr *) &sock->writes.addr, - sock->writes.addrlen, - &sock->writes.overlapped, - NULL); - } - else if (sock->info.proto == PROTO_TCPv4_CLIENT || sock->info.proto == PROTO_TCPv4_SERVER) - { - /* destination address for TCP writes was established on connection initiation */ - sock->writes.addr_defined = false; - - status = WSASend( - sock->sd, - wsabuf, - 1, - &sock->writes.size, - sock->writes.flags, - &sock->writes.overlapped, - NULL); - } - else - { - status = 0; - ASSERT (0); - } - - if (!status) /* operation completed immediately? */ - { - sock->writes.iostate = IOSTATE_IMMEDIATE_RETURN; - - /* since we got an immediate return, we must signal the event object ourselves */ - ASSERT (SetEvent (sock->writes.overlapped.hEvent)); - - sock->writes.status = 0; - - dmsg (D_WIN32_IO, "WIN32 I/O: Socket Send immediate return [%d,%d]", - (int) wsabuf[0].len, - (int) sock->writes.size); - } - else - { - status = WSAGetLastError (); - if (status == WSA_IO_PENDING) /* operation queued? */ - { - sock->writes.iostate = IOSTATE_QUEUED; - sock->writes.status = status; - dmsg (D_WIN32_IO, "WIN32 I/O: Socket Send queued [%d]", - (int) wsabuf[0].len); - } - else /* error occurred */ - { - struct gc_arena gc = gc_new (); - ASSERT (SetEvent (sock->writes.overlapped.hEvent)); - sock->writes.iostate = IOSTATE_IMMEDIATE_RETURN; - sock->writes.status = status; - - dmsg (D_WIN32_IO, "WIN32 I/O: Socket Send error [%d]: %s", - (int) wsabuf[0].len, - strerror_win32 (status, &gc)); - - gc_free (&gc); - } - } - } - return sock->writes.iostate; -} - -int -socket_finalize ( - SOCKET s, - struct overlapped_io *io, - struct buffer *buf, - struct sockaddr_in *from) -{ - int ret = -1; - BOOL status; - - switch (io->iostate) - { - case IOSTATE_QUEUED: - status = WSAGetOverlappedResult( - s, - &io->overlapped, - &io->size, - FALSE, - &io->flags - ); - if (status) - { - /* successful return for a queued operation */ - if (buf) - *buf = io->buf; - ret = io->size; - io->iostate = IOSTATE_INITIAL; - ASSERT (ResetEvent (io->overlapped.hEvent)); - - dmsg (D_WIN32_IO, "WIN32 I/O: Socket Completion success [%d]", ret); - } - else - { - /* error during a queued operation */ - ret = -1; - if (WSAGetLastError() != WSA_IO_INCOMPLETE) - { - /* if no error (i.e. just not finished yet), then DON'T execute this code */ - io->iostate = IOSTATE_INITIAL; - ASSERT (ResetEvent (io->overlapped.hEvent)); - msg (D_WIN32_IO | M_ERRNO_SOCK, "WIN32 I/O: Socket Completion error"); - } - } - break; - - case IOSTATE_IMMEDIATE_RETURN: - io->iostate = IOSTATE_INITIAL; - ASSERT (ResetEvent (io->overlapped.hEvent)); - if (io->status) - { - /* error return for a non-queued operation */ - WSASetLastError (io->status); - ret = -1; - msg (D_WIN32_IO | M_ERRNO_SOCK, "WIN32 I/O: Socket Completion non-queued error"); - } - else - { - /* successful return for a non-queued operation */ - if (buf) - *buf = io->buf; - ret = io->size; - dmsg (D_WIN32_IO, "WIN32 I/O: Socket Completion non-queued success [%d]", ret); - } - break; - - case IOSTATE_INITIAL: /* were we called without proper queueing? */ - WSASetLastError (WSAEINVAL); - ret = -1; - dmsg (D_WIN32_IO, "WIN32 I/O: Socket Completion BAD STATE"); - break; - - default: - ASSERT (0); - } - - /* return from address if requested */ - if (from) - { - if (ret >= 0 && io->addr_defined) - { - if (io->addrlen != sizeof (io->addr)) - bad_address_length (io->addrlen, sizeof (io->addr)); - *from = io->addr; - } - else - CLEAR (*from); - } - - if (buf) - buf->len = ret; - return ret; -} - -#endif /* WIN32 */ - -/* - * Socket event notification - */ - -unsigned int -socket_set (struct link_socket *s, - struct event_set *es, - unsigned int rwflags, - void *arg, - unsigned int *persistent) -{ - if (s) - { - if ((rwflags & EVENT_READ) && !stream_buf_read_setup (s)) - { - ASSERT (!persistent); - rwflags &= ~EVENT_READ; - } - -#ifdef WIN32 - if (rwflags & EVENT_READ) - socket_recv_queue (s, 0); -#endif - - /* if persistent is defined, call event_ctl only if rwflags has changed since last call */ - if (!persistent || *persistent != rwflags) - { - event_ctl (es, socket_event_handle (s), rwflags, arg); - if (persistent) - *persistent = rwflags; - } - - s->rwflags_debug = rwflags; - } - return rwflags; -} |