82 lines
3.0 KiB
C
82 lines
3.0 KiB
C
/* $NetBSD: get_addrs.c,v 1.12 2015/06/16 22:54:11 christos Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)get_addrs.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: get_addrs.c,v 1.12 2015/06/16 22:54:11 christos Exp $");
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#endif /* not lint */
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#include "talk.h"
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <err.h>
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#include "talk_ctl.h"
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void
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get_addrs(const char *my_machine_name, const char *his_machine_name)
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{
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struct hostent *hp;
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struct servent *sp;
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msg.pid = htonl(getpid());
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/*
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* If the callee is on-machine, just use loopback
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* otherwise do a lookup...
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*/
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if (strcmp(his_machine_name, my_machine_name) != 0) {
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/* look up the address of the local host */
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hp = gethostbyname(my_machine_name);
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if (hp == NULL)
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errx(EXIT_FAILURE, "%s: %s", my_machine_name,
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hstrerror(h_errno));
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memcpy(&my_machine_addr, hp->h_addr, sizeof(my_machine_addr));
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hp = gethostbyname(his_machine_name);
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if (hp == NULL)
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errx(EXIT_FAILURE, "%s: %s", his_machine_name,
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hstrerror(h_errno));
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memcpy(&his_machine_addr, hp->h_addr, sizeof(his_machine_addr));
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} else
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his_machine_addr.s_addr = my_machine_addr.s_addr =
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htonl(INADDR_LOOPBACK);
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/* find the server's port */
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sp = getservbyname("ntalk", "udp");
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if (sp == 0)
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errx(EXIT_FAILURE, "%s/%s: service is not registered.",
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"ntalk", "udp");
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daemon_port = sp->s_port;
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}
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