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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31
  32 __FBSDID("$FreeBSD$");
  33
  34 #ifndef lint
  35 static const char sccsid[] = "@(#)get_addrs.c   8.1 (Berkeley) 6/6/93";
  36 #endif
  37
  38 #include <err.h>
  39 #include <netdb.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42
  43 #include "talk.h"
  44 #include "talk_ctl.h"
  45
  46 void
  47 get_addrs(const char *my_machine_name __unused, const char *his_machine_name)
  48 {
  49         struct hostent *hp;
  50         struct servent *sp;
  51
  52         msg.pid = htonl(getpid());
  53
  54         hp = gethostbyname(his_machine_name);
  55         if (hp == NULL)
  56                 errx(1, "%s: %s", his_machine_name, hstrerror(h_errno));
  57         bcopy(hp->h_addr, (char *) &his_machine_addr, hp->h_length);
  58         if (get_iface(&his_machine_addr, &my_machine_addr) == -1)
  59                 err(1, "failed to find my interface address");
  60         /* find the server's port */
  61         sp = getservbyname("ntalk", "udp");
  62         if (sp == NULL)
  63                 errx(1, "ntalk/udp: service is not registered");
  64         daemon_port = sp->s_port;
  65 }