getrpcport.c

   1 /* @(#)getrpcport.c     2.1 88/07/29 4.0 RPCSRC */
   2 /*
   3  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   4  * unrestricted use provided that this legend is included on all tape
   5  * media and as a part of the software program in whole or part.  Users
   6  * may copy or modify Sun RPC without charge, but are not authorized
   7  * to license or distribute it to anyone else except as part of a product or
   8  * program developed by the user.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  */
  30 #if 0
  31 static  char sccsid[] = "@(#)getrpcport.c 1.3 87/08/11 SMI";
  32 #endif
  33
  34 /*
  35  * Copyright (c) 1985 by Sun Microsystems, Inc.
  36  */
  37
  38 #define __FORCE_GLIBC
  39 #include <features.h>
  40
  41 #include <alloca.h>
  42 #include <errno.h>
  43 #include <stdio.h>
  44 #include <netdb.h>
  45 #include <string.h>
  46 #include <rpc/rpc.h>
  47 #include <rpc/clnt.h>
  48 #include <rpc/pmap_clnt.h>
  49 #include <sys/socket.h>
  50
  51
  52 int
  53 getrpcport (const char *host, u_long prognum, u_long versnum, u_int proto)
  54 {
  55   struct sockaddr_in addr;
  56   struct hostent hostbuf, *hp;
  57   size_t buflen;
  58   char *buffer;
  59   int herr;
  60
  61   buflen = 1024;
  62   buffer = alloca (buflen);
  63   while (gethostbyname_r (host, &hostbuf, buffer, buflen, &hp, &herr) != 0
  64          || hp == NULL)
  65     if (herr != NETDB_INTERNAL || errno != ERANGE)
  66       return 0;
  67     else
  68       {
  69         /* Enlarge the buffer.  */
  70         buflen *= 2;
  71         buffer = alloca (buflen);
  72       }
  73
  74   memcpy ((char *) &addr.sin_addr, hp->h_addr, hp->h_length);
  75   addr.sin_family = AF_INET;
  76   addr.sin_port = 0;
  77   return pmap_getport (&addr, prognum, versnum, proto);
  78 }