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Rgetsockname.c

/*
 * Copyright (c) 1997, 1998, 1999, 2000, 2001, 2002, 2003
 *      Inferno Nettverk A/S, Norway.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. The above copyright notice, this list of conditions and the following
 *    disclaimer must appear in all copies of the software, derivative works
 *    or modified versions, and any portions thereof, aswell as in all
 *    supporting documentation.
 * 2. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by
 *      Inferno Nettverk A/S, Norway.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Inferno Nettverk A/S requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  sdc@inet.no
 *  Inferno Nettverk A/S
 *  Oslo Research Park
 *  Gaustadalléen 21
 *  NO-0349 Oslo
 *  Norway
 *
 * any improvements or extensions that they make and grant Inferno Nettverk A/S
 * the rights to redistribute these changes.
 *
 */

#include "common.h"

static const char rcsid[] =
"$Id: Rgetsockname.c,v 1.42 2003/07/01 13:21:24 michaels Exp $";

int
Rgetsockname(s, name, namelen)
      int s;
      struct sockaddr *name;
      socklen_t *namelen;
{
      const char *function = "Rgetsockname()";
      struct socksfd_t *socksfd;
      struct sockaddr *addr;

      clientinit();

      slog(LOG_DEBUG, "%s", function);

      if (!socks_addrisok((unsigned int)s)) {
            socks_rmaddr((unsigned int)s);
            return getsockname(s, name, namelen);
      }

      socksfd = socks_getaddr((unsigned int)s);
      SASSERTX(socksfd != NULL);

      switch (socksfd->state.command) {
            case SOCKS_CONNECT: {
                  sigset_t set, oset;

                  /* for non-blocking connect, we get a SIGCHLD upon completion. */
                  sigemptyset(&set);
                  sigaddset(&set, SIGCHLD);
                  if (sigprocmask(SIG_BLOCK, &set, &oset) != 0) {
                        swarn("%s: sigprocmask()", function);
                        return -1;
                  }

                  if (socksfd->state.inprogress) { /* non-blocking connect. */
                        /*
                         * this is bad.  We don't know what address the socksserver
                         * will use on our behalf yet.  Lets wait for a SIGCHLD
                         * and then retry, unless client is blocking that signal,
                         * then we can only hope the client will retry on ENOBUFS,
                         * but we are probably screwed anyway.
                        */
                        if (sigismember(&oset, SIGCHLD)) {
                              slog(LOG_DEBUG, "%s: SIGCHLD blocked by client", function);

                              if (sigprocmask(SIG_BLOCK, &oset, NULL) != 0) {
                                    swarn("%s: sigprocmask()", function);
                                    return -1;
                              }

                              errno = ENOBUFS;
                              return -1;
                        }

                        sigsuspend(&oset);
                        if (sigprocmask(SIG_BLOCK, &oset, NULL) != 0) {
                              swarn("%s: sigprocmask()", function);
                              return -1;
                        }

                        return Rgetsockname(s, name, namelen);
                  }

                  if (sigprocmask(SIG_SETMASK, &oset, NULL) != 0)
                        swarn("%s: sigprocmask()", function);
                  addr = &socksfd->remote;
                  break;
            }

            case SOCKS_BIND:
                  addr = &socksfd->remote;
                  break;

            case SOCKS_UDPASSOCIATE:
                  swarnx("%s: getsockname() on udp sockets is not supported by the "
                  "socks protocol, trying to fake it.", function);

                  /*
                   * some clients might call this for no good reason, try to
                   * help them by returning a invalid address; if they are
                   * going to use it for anything, they will fail later though.
                   */

                  addr = &socksfd->remote;
                  /* LINTED pointer casts may be troublesome */
                  TOIN(addr)->sin_family              = AF_INET;
                  /* LINTED pointer casts may be troublesome */
                  TOIN(addr)->sin_addr.s_addr   = htonl(INADDR_ANY);
                  /* LINTED pointer casts may be troublesome */
                  TOIN(addr)->sin_port                      = htons(0);
                  break;

            default:
                  SERRX(socksfd->state.command);
      }

      *namelen = MIN(*namelen, sizeof(*addr));
      memcpy(name, addr, (size_t)*namelen);

      return 0;
}

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