NetBSD/usr.bin/talk/get_addrs.c

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/* $NetBSD: get_addrs.c,v 1.5 1998/07/26 22:26:29 mycroft Exp $ */
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/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
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*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
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#ifndef lint
#if 0
static char sccsid[] = "@(#)get_addrs.c 8.1 (Berkeley) 6/6/93";
#endif
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__RCSID("$NetBSD: get_addrs.c,v 1.5 1998/07/26 22:26:29 mycroft Exp $");
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#endif /* not lint */
#include "talk.h"
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#include <netdb.h>
#include <stdio.h>
#include <unistd.h>
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#include "talk_ctl.h"
void
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get_addrs(my_machine_name, his_machine_name)
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const char *my_machine_name, *his_machine_name;
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{
struct hostent *hp;
struct servent *sp;
msg.pid = htonl(getpid());
/* look up the address of the local host */
hp = gethostbyname(my_machine_name);
if (hp == NULL) {
fprintf(stderr, "talk: %s: ", my_machine_name);
herror((char *)NULL);
exit(-1);
}
memmove((char *)&my_machine_addr, hp->h_addr, hp->h_length);
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/*
* If the callee is on-machine, just copy the
* network address, otherwise do a lookup...
*/
if (strcmp(his_machine_name, my_machine_name)) {
hp = gethostbyname(his_machine_name);
if (hp == NULL) {
fprintf(stderr, "talk: %s: ", his_machine_name);
herror((char *)NULL);
exit(-1);
}
memmove((char *) &his_machine_addr, hp->h_addr, hp->h_length);
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} else
his_machine_addr = my_machine_addr;
/* find the server's port */
sp = getservbyname("ntalk", "udp");
if (sp == 0) {
fprintf(stderr, "talk: %s/%s: service is not registered.\n",
"ntalk", "udp");
exit(-1);
}
daemon_port = sp->s_port;
}