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 <rpc/rpc.h>
  42 #include <netdb.h>
  43 #include <sys/socket.h>
  44
  45 int
  46 getrpcport(host, prognum, versnum, proto)
  47         char *host;
  48 {
  49         struct sockaddr_in addr;
  50         struct hostent hostbuf, *hp;
  51         size_t buflen;
  52         char *buffer;
  53         int herr;
  54         int save_errno;
  55
  56         buflen = 1024;
  57         buffer = __alloca (buflen);
  58         save_errno = errno;
  59
  60         while (__gethostbyname_r (host, &hostbuf, buffer, buflen, &hp, &herr)
  61                < 0)
  62           if (herr != NETDB_INTERNAL || errno != ERANGE)
  63             return 0;
  64           else
  65             {
  66               /* Enlarge the buffer.  */
  67               buflen *= 2;
  68               buffer = __alloca (buflen);
  69               __set_errno (0);
  70             }
  71
  72         __set_errno (save_errno);
  73         bcopy(hp->h_addr, (char *) &addr.sin_addr, hp->h_length);
  74         addr.sin_family = AF_INET;
  75         addr.sin_port =  0;
  76         return (pmap_getport(&addr, prognum, versnum, proto));
  77 }