usr.bin/talk/get_addrs.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)get_addrs.c      8.1 (Berkeley) 6/6/93
  34  * $FreeBSD: src/usr.bin/talk/get_addrs.c,v 1.4 1999/08/28 01:06:11 peter Exp $
  35  * $DragonFly: src/usr.bin/talk/get_addrs.c,v 1.3 2003/10/04 20:36:52 hmp Exp $
  36  */
  37
  38 #include <err.h>
  39 #include <netdb.h>
  40 #include <string.h>
  41 #include "talk.h"
  42 #include "talk_ctl.h"
  43
  44 void
  45 get_addrs(char *my_machine_name, char *his_machine_name)
  46 {
  47         struct hostent *hp;
  48         struct servent *sp;
  49
  50         msg.pid = htonl(getpid());
  51
  52         hp = gethostbyname(his_machine_name);
  53         if (hp == NULL)
  54                 errx(1, "%s: %s", his_machine_name, hstrerror(h_errno));
  55         bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
  56         if (get_iface(&his_machine_addr, &my_machine_addr) == -1)
  57                 err(1, "failed to find my interface address");
  58         /* find the server's port */
  59         sp = getservbyname("ntalk", "udp");
  60         if (sp == 0)
  61                 errx(1, "ntalk/udp: service is not registered");
  62         daemon_port = sp->s_port;
  63 }