sunrpc/getrpcport.c

   1 /*
   2  * Copyright (c) 2010, Oracle America, Inc.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  *     * Redistributions of source code must retain the above copyright
   9  *       notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  *       copyright notice, this list of conditions and the following
  12  *       disclaimer in the documentation and/or other materials
  13  *       provided with the distribution.
  14  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  15  *       contributors may be used to endorse or promote products derived
  16  *       from this software without specific prior written permission.
  17  *
  18  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  21  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  22  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  23  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  25  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  27  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <alloca.h>
  33 #include <errno.h>
  34 #include <stdio.h>
  35 #include <netdb.h>
  36 #include <string.h>
  37 #include <rpc/rpc.h>
  38 #include <rpc/clnt.h>
  39 #include <rpc/pmap_clnt.h>
  40 #include <sys/socket.h>
  41
  42 int
  43 getrpcport (const char *host, u_long prognum, u_long versnum, u_int proto)
  44 {
  45   struct sockaddr_in addr;
  46   struct hostent hostbuf, *hp;
  47   size_t buflen;
  48   char *buffer;
  49   int herr;
  50
  51   buflen = 1024;
  52   buffer = __alloca (buflen);
  53   while (__gethostbyname_r (host, &hostbuf, buffer, buflen, &hp, &herr) != 0
  54          || hp == NULL)
  55     if (herr != NETDB_INTERNAL || errno != ERANGE)
  56       return 0;
  57     else
  58       {
  59         /* Enlarge the buffer.  */
  60         buflen *= 2;
  61         buffer = __alloca (buflen);
  62       }
  63
  64   memcpy ((char *) &addr.sin_addr, hp->h_addr, hp->h_length);
  65   addr.sin_family = AF_INET;
  66   addr.sin_port = 0;
  67   return pmap_getport (&addr, prognum, versnum, proto);
  68 }