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9d61853d9f
"machine name" in ntalkd(8) request packets, when the destination and source are local. This should make talk(1) use much more pleasant for those security- conscious individuals who have chosen to bind talkd to "localhost". Previous to this change, talk(1) would require that the hostname of the machine, as retrieved by gethostname(3), resolved to a valid and reachable IPv4 address, using gethostbyname(3). This makes talk(1) dependent on a valid host entry for "localhost" in /etc/hosts (or the Domain Name System). PR: bin/23178 Submitted by: angui.sh admin (with cleanups)
125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 6/6/93";
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#endif
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#include <sys/param.h>
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#include <err.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include <string.h>
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#include "talk.h"
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extern CTL_MSG msg;
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static void
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usage(void)
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{
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fprintf(stderr, "usage: talk person [ttyname]\n");
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exit(1);
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}
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/*
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* Determine the local and remote user, tty, and machines
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*/
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void
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get_names(argc, argv)
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int argc;
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char *argv[];
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{
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char hostname[MAXHOSTNAMELEN];
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char *his_name, *my_name;
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char *my_machine_name, *his_machine_name;
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const char *his_tty;
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char *cp;
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if (argc < 2 )
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usage();
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if (!isatty(0))
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errx(1, "standard input must be a tty, not a pipe or a file");
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if ((my_name = getlogin()) == NULL) {
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struct passwd *pw;
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if ((pw = getpwuid(getuid())) == NULL)
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errx(1, "you don't exist. Go away");
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my_name = pw->pw_name;
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}
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gethostname(hostname, sizeof (hostname));
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my_machine_name = hostname;
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/* check for, and strip out, the machine name of the target */
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for (cp = argv[1]; *cp && !index("@:!", *cp); cp++)
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;
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if (*cp == '\0') {
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/* this is a local to local talk */
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his_name = argv[1];
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my_machine_name = his_machine_name = "localhost";
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} else {
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if (*cp++ == '@') {
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/* user@host */
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his_name = argv[1];
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his_machine_name = cp;
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} else {
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/* host!user or host:user */
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his_name = cp;
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his_machine_name = argv[1];
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}
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*--cp = '\0';
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}
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if (argc > 2)
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his_tty = argv[2]; /* tty name is arg 2 */
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else
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his_tty = "";
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get_addrs(my_machine_name, his_machine_name);
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/*
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* Initialize the message template.
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*/
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msg.vers = TALK_VERSION;
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msg.addr.sa_family = htons(AF_INET);
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msg.ctl_addr.sa_family = htons(AF_INET);
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msg.id_num = htonl(0);
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strncpy(msg.l_name, my_name, NAME_SIZE);
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msg.l_name[NAME_SIZE - 1] = '\0';
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strncpy(msg.r_name, his_name, NAME_SIZE);
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msg.r_name[NAME_SIZE - 1] = '\0';
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strncpy(msg.r_tty, his_tty, TTY_SIZE);
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msg.r_tty[TTY_SIZE - 1] = '\0';
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}
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