diff options
Diffstat (limited to 'socket.c')
| -rw-r--r-- | socket.c | 2154 |
1 files changed, 2154 insertions, 0 deletions
diff --git a/socket.c b/socket.c new file mode 100644 index 0000000..070e4ec --- /dev/null +++ b/socket.c @@ -0,0 +1,2154 @@ +/* + * 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 (!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; + + ASSERT (sock); + + /* 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: + 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; +} |