sunrpc/getrpcport.c

   1 /* @(#)getrpcport.c     2.1 88/07/29 4.0 RPCSRC */
   2 #if !defined(lint) && defined(SCCSIDS)
   3 static  char sccsid[] = "@(#)getrpcport.c 1.3 87/08/11 SMI";
   4 #endif
   5 /*
   6  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   7  * unrestricted use provided that this legend is included on all tape
   8  * media and as a part of the software program in whole or part.  Users
   9  * may copy or modify Sun RPC without charge, but are not authorized
  10  * to license or distribute it to anyone else except as part of a product or
  11  * program developed by the user.
  12  *
  13  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  14  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  15  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  16  *
  17  * Sun RPC is provided with no support and without any obligation on the
  18  * part of Sun Microsystems, Inc. to assist in its use, correction,
  19  * modification or enhancement.
  20  *
  21  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  22  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  23  * OR ANY PART THEREOF.
  24  *
  25  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  26  * or profits or other special, indirect and consequential damages, even if
  27  * Sun has been advised of the possibility of such damages.
  28  *
  29  * Sun Microsystems, Inc.
  30  * 2550 Garcia Avenue
  31  * Mountain View, California  94043
  32  */
  33
  34 /*
  35  * Copyright (c) 1985 by Sun Microsystems, Inc.
  36  */
  37
  38 #include <alloca.h>
  39 #include <errno.h>
  40 #include <stdio.h>
  41 #include <netdb.h>
  42 #include <string.h>
  43 #include <rpc/rpc.h>
  44 #include <rpc/clnt.h>
  45 #include <rpc/pmap_clnt.h>
  46 #include <sys/socket.h>
  47
  48 int
  49 getrpcport (const char *host, u_long prognum, u_long versnum, u_int proto)
  50 {
  51   struct sockaddr_in addr;
  52   struct hostent hostbuf, *hp;
  53   size_t buflen;
  54   char *buffer;
  55   int herr;
  56
  57   buflen = 1024;
  58   buffer = __alloca (buflen);
  59   while (__gethostbyname_r (host, &hostbuf, buffer, buflen, &hp, &herr) != 0
  60          || hp == NULL)
  61     if (herr != NETDB_INTERNAL || errno != ERANGE)
  62       return 0;
  63     else
  64       {
  65         /* Enlarge the buffer.  */
  66         buflen *= 2;
  67         buffer = __alloca (buflen);
  68       }
  69
  70   memcpy ((char *) &addr.sin_addr, hp->h_addr, hp->h_length);
  71   addr.sin_family = AF_INET;
  72   addr.sin_port = 0;
  73   return pmap_getport (&addr, prognum, versnum, proto);
  74 }