talk.tproj/get_addrs.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1983, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57
  58 #include <sys/types.h>
  59 #include <sys/socket.h>
  60 #include <netinet/in.h>
  61 #include <protocols/talkd.h>
  62 #include <netdb.h>
  63 #include <stdio.h>
  64 #include "talk_ctl.h"
  65
  66 get_addrs(my_machine_name, his_machine_name)
  67         char *my_machine_name, *his_machine_name;
  68 {
  69         struct hostent *hp;
  70         struct servent *sp;
  71
  72         msg.pid = htonl(getpid());
  73         /* look up the address of the local host */
  74         hp = gethostbyname(my_machine_name);
  75         if (hp == NULL) {
  76                 fprintf(stderr, "talk: %s: ", my_machine_name);
  77                 herror((char *)NULL);
  78                 exit(-1);
  79         }
  80         bcopy(hp->h_addr, (char *)&my_machine_addr, hp->h_length);
  81         /*
  82          * If the callee is on-machine, just copy the
  83          * network address, otherwise do a lookup...
  84          */
  85         if (strcmp(his_machine_name, my_machine_name)) {
  86                 hp = gethostbyname(his_machine_name);
  87                 if (hp == NULL) {
  88                         fprintf(stderr, "talk: %s: ", his_machine_name);
  89                         herror((char *)NULL);
  90                         exit(-1);
  91                 }
  92                 bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
  93         } else
  94                 his_machine_addr = my_machine_addr;
  95         /* find the server's port */
  96         sp = getservbyname("ntalk", "udp");
  97         if (sp == 0) {
  98                 fprintf(stderr, "talk: %s/%s: service is not registered.\n",
  99                      "ntalk", "udp");
 100                 exit(-1);
 101         }
 102         daemon_port = sp->s_port;
 103 }