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authorChristian Pointner <equinox@anytun.org>2008-05-20 14:36:04 +0000
committerChristian Pointner <equinox@anytun.org>2008-05-20 14:36:04 +0000
commitb2f54ec4947b60b9d989cb887f6c62c93a738e02 (patch)
treed32b3f7427c836adfaea53e0a16fd43585e79879 /src/openvpn/socket.c
parentadded -i option to anyrtpproxy (diff)
removed openvpn source code
Diffstat (limited to 'src/openvpn/socket.c')
-rw-r--r--src/openvpn/socket.c2175
1 files changed, 0 insertions, 2175 deletions
diff --git a/src/openvpn/socket.c b/src/openvpn/socket.c
deleted file mode 100644
index c82471f..0000000
--- a/src/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;
-}