Imported Upstream version 2.3_rc1

1 files changed, 0 insertions, 718 deletions

diff --git a/mtcp.c b/mtcp.c
deleted file mode 100644
index 314aa44..0000000
--- a/mtcp.c
+++ /dev/null
@@ -1,718 +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) 2002-2010 OpenVPN Technologies, Inc. <sales@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
- */
-
-#include "syshead.h"
-
-#if P2MP_SERVER
-
-#include "multi.h"
-#include "forward-inline.h"
-
-#include "memdbg.h"
-
-/*
- * TCP States
- */
-#define TA_UNDEF                 0
-#define TA_SOCKET_READ           1
-#define TA_SOCKET_READ_RESIDUAL  2
-#define TA_SOCKET_WRITE          3
-#define TA_SOCKET_WRITE_READY    4
-#define TA_SOCKET_WRITE_DEFERRED 5
-#define TA_TUN_READ              6
-#define TA_TUN_WRITE             7
-#define TA_INITIAL               8
-#define TA_TIMEOUT               9
-#define TA_TUN_WRITE_TIMEOUT     10
-
-/*
- * Special tags passed to event.[ch] functions
- */
-#define MTCP_SOCKET      ((void*)1)
-#define MTCP_TUN         ((void*)2)
-#define MTCP_SIG         ((void*)3) /* Only on Windows */
-#ifdef ENABLE_MANAGEMENT
-# define MTCP_MANAGEMENT ((void*)4)
-#endif
-
-#define MTCP_N           ((void*)16) /* upper bound on MTCP_x */
-
-struct ta_iow_flags
-{
-  unsigned int flags;
-  unsigned int ret;
-  unsigned int tun;
-  unsigned int sock;
-};
-
-static const char *
-pract (int action)
-{
-  switch (action)
-    {
-    case TA_UNDEF:
-      return "TA_UNDEF";
-    case TA_SOCKET_READ:
-      return "TA_SOCKET_READ";
-    case TA_SOCKET_READ_RESIDUAL:
-      return "TA_SOCKET_READ_RESIDUAL";
-    case TA_SOCKET_WRITE:
-      return "TA_SOCKET_WRITE";
-    case TA_SOCKET_WRITE_READY:
-      return "TA_SOCKET_WRITE_READY";
-    case TA_SOCKET_WRITE_DEFERRED:
-      return "TA_SOCKET_WRITE_DEFERRED";
-    case TA_TUN_READ:
-      return "TA_TUN_READ";
-    case TA_TUN_WRITE:
-      return "TA_TUN_WRITE";
-    case TA_INITIAL:
-      return "TA_INITIAL";
-    case TA_TIMEOUT:
-      return "TA_TIMEOUT";
-    case TA_TUN_WRITE_TIMEOUT:
-      return "TA_TUN_WRITE_TIMEOUT";
-    default:
-      return "?";
-    }
-}
-
-static struct multi_instance *
-multi_create_instance_tcp (struct multi_context *m)
-{
-  struct gc_arena gc = gc_new ();
-  struct multi_instance *mi = NULL;
-  struct hash *hash = m->hash;
-
-  mi = multi_create_instance (m, NULL);
-  if (mi)
-    {
-      struct hash_element *he;
-      const uint32_t hv = hash_value (hash, &mi->real);
-      struct hash_bucket *bucket = hash_bucket (hash, hv);
-  
-      he = hash_lookup_fast (hash, bucket, &mi->real, hv);
-
-      if (he)
-	{
-	  struct multi_instance *oldmi = (struct multi_instance *) he->value;
-	  msg (D_MULTI_LOW, "MULTI TCP: new incoming client address matches existing client address -- new client takes precedence");
-	  oldmi->did_real_hash = false;
-	  multi_close_instance (m, oldmi, false);
-	  he->key = &mi->real;
-	  he->value = mi;
-	}
-      else
-	hash_add_fast (hash, bucket, &mi->real, hv, mi);
-
-      mi->did_real_hash = true;
-    }
-
-#ifdef ENABLE_DEBUG
-  if (mi)
-    dmsg (D_MULTI_DEBUG, "MULTI TCP: instance added: %s", mroute_addr_print (&mi->real, &gc));
-  else
-    dmsg (D_MULTI_DEBUG, "MULTI TCP: new client instance failed");
-#endif
-
-  gc_free (&gc);
-  ASSERT (!(mi && mi->halt));
-  return mi;
-}
-
-bool
-multi_tcp_instance_specific_init (struct multi_context *m, struct multi_instance *mi)
-{
-  /* buffer for queued TCP socket output packets */
-  mi->tcp_link_out_deferred = mbuf_init (m->top.options.n_bcast_buf);
-
-  ASSERT (mi->context.c2.link_socket);
-  ASSERT (mi->context.c2.link_socket->info.lsa);
-  ASSERT (mi->context.c2.link_socket->mode == LS_MODE_TCP_ACCEPT_FROM);
-  if (!mroute_extract_openvpn_sockaddr (&mi->real, &mi->context.c2.link_socket->info.lsa->actual.dest, true))
-    {
-      msg (D_MULTI_ERRORS, "MULTI TCP: TCP client address is undefined");
-      return false;
-    }
-  return true;
-}
-
-void
-multi_tcp_instance_specific_free (struct multi_instance *mi)
-{
-  mbuf_free (mi->tcp_link_out_deferred);
-}
-
-struct multi_tcp *
-multi_tcp_init (int maxevents, int *maxclients)
-{
-  struct multi_tcp *mtcp;
-  const int extra_events = BASE_N_EVENTS;
-
-  ASSERT (maxevents >= 1);
-  ASSERT (maxclients);
-
-  ALLOC_OBJ_CLEAR (mtcp, struct multi_tcp);
-  mtcp->maxevents = maxevents + extra_events;
-  mtcp->es = event_set_init (&mtcp->maxevents, 0);
-  wait_signal (mtcp->es, MTCP_SIG);
-  ALLOC_ARRAY (mtcp->esr, struct event_set_return, mtcp->maxevents);
-  *maxclients = max_int (min_int (mtcp->maxevents - extra_events, *maxclients), 1);
-  msg (D_MULTI_LOW, "MULTI: TCP INIT maxclients=%d maxevents=%d", *maxclients, mtcp->maxevents);
-  return mtcp;
-}
-
-void
-multi_tcp_delete_event (struct multi_tcp *mtcp, event_t event)
-{
-  if (mtcp && mtcp->es)
-    event_del (mtcp->es, event);
-}
-
-void
-multi_tcp_free (struct multi_tcp *mtcp)
-{
-  if (mtcp)
-    {
-      event_free (mtcp->es);
-      if (mtcp->esr)
-	free (mtcp->esr);
-      free (mtcp);
-    }
-}
-
-void
-multi_tcp_dereference_instance (struct multi_tcp *mtcp, struct multi_instance *mi)
-{
-  struct link_socket *ls = mi->context.c2.link_socket;
-  if (ls && mi->socket_set_called)
-    event_del (mtcp->es, socket_event_handle (ls));
-  mtcp->n_esr = 0;
-}
-
-static inline void
-multi_tcp_set_global_rw_flags (struct multi_context *m, struct multi_instance *mi)
-{
-  if (mi)
-    {
-      mi->socket_set_called = true;
-      socket_set (mi->context.c2.link_socket,
-		  m->mtcp->es,
-		  mbuf_defined (mi->tcp_link_out_deferred) ? EVENT_WRITE : EVENT_READ,
-		  mi,
-		  &mi->tcp_rwflags);
-    }
-}
-
-static inline int
-multi_tcp_wait (const struct context *c,
-		struct multi_tcp *mtcp)
-{
-  int status;
-  socket_set_listen_persistent (c->c2.link_socket, mtcp->es, MTCP_SOCKET);
-  tun_set (c->c1.tuntap, mtcp->es, EVENT_READ, MTCP_TUN, &mtcp->tun_rwflags);
-#ifdef ENABLE_MANAGEMENT
-  if (management)
-    management_socket_set (management, mtcp->es, MTCP_MANAGEMENT, &mtcp->management_persist_flags);
-#endif
-  status = event_wait (mtcp->es, &c->c2.timeval, mtcp->esr, mtcp->maxevents);
-  update_time ();
-  mtcp->n_esr = 0;
-  if (status > 0)
-    mtcp->n_esr = status;
-  return status;
-}
-
-static inline struct context *
-multi_tcp_context (struct multi_context *m, struct multi_instance *mi)
-{
-  if (mi)
-    return &mi->context;
-  else
-    return &m->top;
-}
-
-static bool
-multi_tcp_process_outgoing_link_ready (struct multi_context *m, struct multi_instance *mi, const unsigned int mpp_flags)
-{
-  struct mbuf_item item;
-  bool ret = true;
-  ASSERT (mi);
-
-  /* extract from queue */
-  if (mbuf_extract_item (mi->tcp_link_out_deferred, &item)) /* ciphertext IP packet */
-    {
-      dmsg (D_MULTI_TCP, "MULTI TCP: transmitting previously deferred packet");
-
-      ASSERT (mi == item.instance);
-      mi->context.c2.to_link = item.buffer->buf;
-      ret = multi_process_outgoing_link_dowork (m, mi, mpp_flags);
-      if (!ret)
-	mi = NULL;
-      mbuf_free_buf (item.buffer);
-    }
-  return ret;
-}
-
-static bool
-multi_tcp_process_outgoing_link (struct multi_context *m, bool defer, const unsigned int mpp_flags)
-{
-  struct multi_instance *mi = multi_process_outgoing_link_pre (m);
-  bool ret = true;
-
-  if (mi)
-    {
-      if (defer || mbuf_defined (mi->tcp_link_out_deferred))
-	{
-	  /* save to queue */
-	  struct buffer *buf = &mi->context.c2.to_link;
-	  if (BLEN (buf) > 0)
-	    {
-	      struct mbuf_buffer *mb = mbuf_alloc_buf (buf);
-	      struct mbuf_item item;
-
-	      set_prefix (mi);
-	      dmsg (D_MULTI_TCP, "MULTI TCP: queuing deferred packet");
-	      item.buffer = mb;
-	      item.instance = mi;
-	      mbuf_add_item (mi->tcp_link_out_deferred, &item);
-	      mbuf_free_buf (mb);
-	      buf_reset (buf);
-	      ret = multi_process_post (m, mi, mpp_flags);
-	      if (!ret)
-		mi = NULL;
-	      clear_prefix ();
-	    }
-	}
-      else
-	{
-	  ret = multi_process_outgoing_link_dowork (m, mi, mpp_flags);
-	  if (!ret)
-	    mi = NULL;
-	}
-    }
-  return ret;
-}
-
-static int
-multi_tcp_wait_lite (struct multi_context *m, struct multi_instance *mi, const int action, bool *tun_input_pending)
-{
-  struct context *c = multi_tcp_context (m, mi);
-  unsigned int looking_for = 0;
-
-  dmsg (D_MULTI_DEBUG, "MULTI TCP: multi_tcp_wait_lite a=%s mi=" ptr_format,
-       pract(action),
-       (ptr_type)mi);
-
-  tv_clear (&c->c2.timeval); /* ZERO-TIMEOUT */
-
-  switch (action)
-    {
-      case TA_TUN_READ:
-	looking_for = TUN_READ;
-	tun_input_pending = NULL;
-	io_wait (c, IOW_READ_TUN);
-	break;
-      case TA_SOCKET_READ:
-	looking_for = SOCKET_READ;
-	tun_input_pending = NULL;
-	io_wait (c, IOW_READ_LINK);
-	break;
-      case TA_TUN_WRITE:
-	looking_for = TUN_WRITE;
-	tun_input_pending = NULL;
-	c->c2.timeval.tv_sec = 1; /* For some reason, the Linux 2.2 TUN/TAP driver hits this timeout */
-	perf_push (PERF_PROC_OUT_TUN_MTCP);
-	io_wait (c, IOW_TO_TUN);
-	perf_pop ();
-	break;
-      case TA_SOCKET_WRITE:
-	looking_for = SOCKET_WRITE;
-	io_wait (c, IOW_TO_LINK|IOW_READ_TUN_FORCE);
-	break;
-      default:
-	msg (M_FATAL, "MULTI TCP: multi_tcp_wait_lite, unhandled action=%d", action);
-    }
-
-  if (tun_input_pending && (c->c2.event_set_status & TUN_READ))
-    *tun_input_pending = true;
-
-  if (c->c2.event_set_status & looking_for)
-    {
-      return action;
-    }
-  else
-    {
-      switch (action)
-	{
-	/* TCP socket output buffer is full */
-	case TA_SOCKET_WRITE:
-	  return TA_SOCKET_WRITE_DEFERRED;
-
-	/* TUN device timed out on accepting write */
-	case TA_TUN_WRITE:
-	  return TA_TUN_WRITE_TIMEOUT;
-	}
-
-      return TA_UNDEF;
-    }
-}
-
-static struct multi_instance *
-multi_tcp_dispatch (struct multi_context *m, struct multi_instance *mi, const int action)
-{
-  const unsigned int mpp_flags = MPP_PRE_SELECT|MPP_RECORD_TOUCH;
-  struct multi_instance *touched = mi;
-  m->mpp_touched = &touched;
-
-  dmsg (D_MULTI_DEBUG, "MULTI TCP: multi_tcp_dispatch a=%s mi=" ptr_format,
-       pract(action),
-       (ptr_type)mi);
-
-  switch (action)
-    {
-    case TA_TUN_READ:
-      read_incoming_tun (&m->top);
-      if (!IS_SIG (&m->top))
-	multi_process_incoming_tun (m, mpp_flags);
-      break;
-    case TA_SOCKET_READ:
-    case TA_SOCKET_READ_RESIDUAL:
-      ASSERT (mi);
-      ASSERT (mi->context.c2.link_socket);
-      set_prefix (mi);
-      read_incoming_link (&mi->context);
-      clear_prefix ();
-      if (!IS_SIG (&mi->context))
-	{
-	  multi_process_incoming_link (m, mi, mpp_flags);
-	  if (!IS_SIG (&mi->context))
-	    stream_buf_read_setup (mi->context.c2.link_socket);
-	}
-      break;
-    case TA_TIMEOUT:
-      multi_process_timeout (m, mpp_flags);
-      break;
-    case TA_TUN_WRITE:
-      multi_process_outgoing_tun (m, mpp_flags);
-      break;
-    case TA_TUN_WRITE_TIMEOUT:
-      multi_process_drop_outgoing_tun (m, mpp_flags);      
-      break;
-    case TA_SOCKET_WRITE_READY:
-      ASSERT (mi);
-      multi_tcp_process_outgoing_link_ready (m, mi, mpp_flags);
-      break;
-    case TA_SOCKET_WRITE:
-      multi_tcp_process_outgoing_link (m, false, mpp_flags);
-      break;
-    case TA_SOCKET_WRITE_DEFERRED:
-      multi_tcp_process_outgoing_link (m, true, mpp_flags);
-      break;
-    case TA_INITIAL:
-      ASSERT (mi);
-      multi_tcp_set_global_rw_flags (m, mi);
-      multi_process_post (m, mi, mpp_flags);
-      break;
-    default:
-      msg (M_FATAL, "MULTI TCP: multi_tcp_dispatch, unhandled action=%d", action);
-    }
-
-  m->mpp_touched = NULL;
-  return touched;
-}
-
-int
-multi_tcp_post (struct multi_context *m, struct multi_instance *mi, const int action)
-{
-  struct context *c = multi_tcp_context (m, mi);
-  int newaction = TA_UNDEF;
-
-# define MTP_NONE         0
-# define MTP_TUN_OUT      (1<<0)
-# define MTP_LINK_OUT     (1<<1)
-  unsigned int flags = MTP_NONE;
-
-  if (TUN_OUT(c))
-    flags |= MTP_TUN_OUT;
-  if (LINK_OUT(c))
-    flags |= MTP_LINK_OUT;
-
-  switch (flags)
-    {
-    case MTP_TUN_OUT|MTP_LINK_OUT:
-    case MTP_TUN_OUT:
-      newaction = TA_TUN_WRITE;
-      break;
-    case MTP_LINK_OUT:
-      newaction = TA_SOCKET_WRITE;
-      break;
-    case MTP_NONE:
-      if (mi && socket_read_residual (c->c2.link_socket))
-	newaction = TA_SOCKET_READ_RESIDUAL;
-      else
-	multi_tcp_set_global_rw_flags (m, mi);
-      break;
-    default:
-      {
-	struct gc_arena gc = gc_new ();
-	msg (M_FATAL, "MULTI TCP: multi_tcp_post bad state, mi=%s flags=%d",
-	     multi_instance_string (mi, false, &gc),
-	     flags);
-	gc_free (&gc);
-	break;
-      }
-    }
-
-  dmsg (D_MULTI_DEBUG, "MULTI TCP: multi_tcp_post %s -> %s",
-       pract(action),
-       pract(newaction));
-
-  return newaction;
-}
-
-static void
-multi_tcp_action (struct multi_context *m, struct multi_instance *mi, int action, bool poll)
-{
-  bool tun_input_pending = false;
-
-  do {
-    dmsg (D_MULTI_DEBUG, "MULTI TCP: multi_tcp_action a=%s p=%d",
-	 pract(action),
-	 poll);
-
-    /*
-     * If TA_SOCKET_READ_RESIDUAL, it means we still have pending
-     * input packets which were read by a prior TCP recv.
-     *
-     * Otherwise do a "lite" wait, which means we wait with 0 timeout
-     * on I/O events only related to the current instance, not
-     * the big list of events.
-     *
-     * On our first pass, poll will be false because we already know
-     * that input is available, and to call io_wait would be redundant.
-     */
-    if (poll && action != TA_SOCKET_READ_RESIDUAL)
-      {
-	const int orig_action = action;
-	action = multi_tcp_wait_lite (m, mi, action, &tun_input_pending);
-	if (action == TA_UNDEF)
-	  msg (M_FATAL, "MULTI TCP: I/O wait required blocking in multi_tcp_action, action=%d", orig_action);
-      }
-
-    /*
-     * Dispatch the action
-     */
-    {
-      struct multi_instance *touched = multi_tcp_dispatch (m, mi, action);
-
-      /*
-       * Signal received or TCP connection
-       * reset by peer?
-       */
-      if (touched && IS_SIG (&touched->context))
-	{
-	  if (mi == touched)
-	    mi = NULL;
-	  multi_close_instance_on_signal (m, touched);
-	}
-    }
-
-    /*
-     * If dispatch produced any pending output
-     * for a particular instance, point to
-     * that instance.
-     */
-    if (m->pending)
-      mi = m->pending;
-
-    /*
-     * Based on the effects of the action,
-     * such as generating pending output,
-     * possibly transition to a new action state.
-     */
-    action = multi_tcp_post (m, mi, action);
-
-    /*
-     * If we are finished processing the original action,
-     * check if we have any TUN input.  If so, transition
-     * our action state to processing this input.
-     */
-    if (tun_input_pending && action == TA_UNDEF)
-      {
-	action = TA_TUN_READ;
-	mi = NULL;
-	tun_input_pending = false;
-	poll = false;
-      }
-    else
-      poll = true;
-
-  } while (action != TA_UNDEF);
-}
-
-static void
-multi_tcp_process_io (struct multi_context *m)
-{
-  struct multi_tcp *mtcp = m->mtcp;
-  int i;
-
-  for (i = 0; i < mtcp->n_esr; ++i)
-    {
-      struct event_set_return *e = &mtcp->esr[i];
-
-      /* incoming data for instance? */
-      if (e->arg >= MTCP_N)
-	{
-	  struct multi_instance *mi = (struct multi_instance *) e->arg;
-	  if (mi)
-	    {
-	      if (e->rwflags & EVENT_WRITE)
-		multi_tcp_action (m, mi, TA_SOCKET_WRITE_READY, false);
-	      else if (e->rwflags & EVENT_READ)
-		multi_tcp_action (m, mi, TA_SOCKET_READ, false);
-	    }
-	}
-      else
-	{
-#ifdef ENABLE_MANAGEMENT
-	  if (e->arg == MTCP_MANAGEMENT)
-	    {
-	      ASSERT (management);
-	      management_io (management);
-	    }
-	  else
-#endif
-	  /* incoming data on TUN? */
-	  if (e->arg == MTCP_TUN)
-	    {
-	      if (e->rwflags & EVENT_WRITE)
-		multi_tcp_action (m, NULL, TA_TUN_WRITE, false);
-	      else if (e->rwflags & EVENT_READ)
-		multi_tcp_action (m, NULL, TA_TUN_READ, false);
-	    }
-	  /* new incoming TCP client attempting to connect? */
-	  else if (e->arg == MTCP_SOCKET)
-	    {
-	      struct multi_instance *mi;
-	      ASSERT (m->top.c2.link_socket);
-	      socket_reset_listen_persistent (m->top.c2.link_socket);
-	      mi = multi_create_instance_tcp (m);
-	      if (mi)
-		multi_tcp_action (m, mi, TA_INITIAL, false);
-	    }
-	  /* signal received? */
-	  else if (e->arg == MTCP_SIG)
-	    {
-	      get_signal (&m->top.sig->signal_received);
-	    }
-	}
-      if (IS_SIG (&m->top))
-	break;
-    }
-  mtcp->n_esr = 0;
-
-  /*
-   * Process queued mbuf packets destined for TCP socket
-   */
-  {
-    struct multi_instance *mi;
-    while (!IS_SIG (&m->top) && (mi = mbuf_peek (m->mbuf)) != NULL)
-      {
-	multi_tcp_action (m, mi, TA_SOCKET_WRITE, true);
-      }
-  }
-}
-
-/*
- * Top level event loop for single-threaded operation.
- * TCP mode.
- */
-void
-tunnel_server_tcp (struct context *top)
-{
-  struct multi_context multi;
-  int status;
-
-  top->mode = CM_TOP;
-  context_clear_2 (top);
-
-  /* initialize top-tunnel instance */
-  init_instance_handle_signals (top, top->es, CC_HARD_USR1_TO_HUP);
-  if (IS_SIG (top))
-    return;
-  
-  /* initialize global multi_context object */
-  multi_init (&multi, top, true, MC_SINGLE_THREADED);
-
-  /* initialize our cloned top object */
-  multi_top_init (&multi, top, true);
-
-  /* initialize management interface */
-  init_management_callback_multi (&multi);
-
-  /* finished with initialization */
-  initialization_sequence_completed (top, ISC_SERVER); /* --mode server --proto tcp-server */
-
-  /* per-packet event loop */
-  while (true)
-    {
-      perf_push (PERF_EVENT_LOOP);
-
-      /* wait on tun/socket list */
-      multi_get_timeout (&multi, &multi.top.c2.timeval);
-      status = multi_tcp_wait (&multi.top, multi.mtcp);
-      MULTI_CHECK_SIG (&multi);
-
-      /* check on status of coarse timers */
-      multi_process_per_second_timers (&multi);
-
-      /* timeout? */
-      if (status > 0)
-	{
-	  /* process the I/O which triggered select */
-	  multi_tcp_process_io (&multi);
-	  MULTI_CHECK_SIG (&multi);
-	}
-      else if (status == 0)
-	{
-	  multi_tcp_action (&multi, NULL, TA_TIMEOUT, false);
-	}
-
-      perf_pop ();
-    }
-
-  /* shut down management interface */
-  uninit_management_callback_multi (&multi);
-
-  /* save ifconfig-pool */
-  multi_ifconfig_pool_persist (&multi, true);
-
-  /* tear down tunnel instance (unless --persist-tun) */
-  multi_uninit (&multi);
-  multi_top_free (&multi);
-  close_instance (top);
-}
-
-#endif