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Commit	Line	Data
	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. 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	* @(#)get_names.c 8.1 (Berkeley) 6/6/93
	30	* $FreeBSD: src/usr.bin/talk/get_names.c,v 1.6.2.1 2001/07/30 10:31:29 dd Exp $
	31	*/
	32
	33	#include <err.h>
	34	#include <pwd.h>
	35	#include <stdlib.h>
	36	#include <string.h>
	37	#include <sys/param.h>
	38	#include "talk.h"
	39
	40	extern CTL_MSG msg;
	41
	42	static void
	43	usage(void)
	44	{
	45	fprintf(stderr, "usage: talk person [ttyname]\n");
	46	exit(1);
	47	}
	48
	49	/*
	50	* Determine the local and remote user, tty, and machines
	51	*/
	52	void
	53	get_names(int argc, char **argv)
	54	{
	55	char hostname[MAXHOSTNAMELEN];
	56	char his_name, my_name;
	57	char my_machine_name, his_machine_name;
	58	const char *his_tty;
	59	char *cp;
	60
	61	if (argc < 2 )
	62	usage();
	63	if (!isatty(0))
	64	errx(1, "standard input must be a tty, not a pipe or a file");
	65	if ((my_name = getlogin()) == NULL) {
	66	struct passwd *pw;
	67
	68	if ((pw = getpwuid(getuid())) == NULL)
	69	errx(1, "you don't exist. Go away");
	70	my_name = pw->pw_name;
	71	}
	72	gethostname(hostname, sizeof (hostname));
	73	my_machine_name = hostname;
	74	/* check for, and strip out, the machine name of the target */
	75	for (cp = argv[1]; cp && !strchr("@:!", cp); cp++)
	76	;
	77	if (*cp == '\0') {
	78	/* this is a local to local talk */
	79	his_name = argv[1];
	80	his_machine_name = my_machine_name;
	81	} else {
	82	if (*cp++ == '@') {
	83	/* user@host */
	84	his_name = argv[1];
	85	his_machine_name = cp;
	86	} else {
	87	/* host!user or host:user */
	88	his_name = cp;
	89	his_machine_name = argv[1];
	90	}
	91	*--cp = '\0';
	92	}
	93	if (argc > 2)
	94	his_tty = argv[2]; /* tty name is arg 2 */
	95	else
	96	his_tty = "";
	97	get_addrs(my_machine_name, his_machine_name);
	98	/*
	99	* Initialize the message template.
	100	*/
	101	msg.vers = TALK_VERSION;
	102	msg.addr.sa_family = htons(AF_INET);
	103	msg.ctl_addr.sa_family = htons(AF_INET);
	104	msg.id_num = htonl(0);
	105	strncpy(msg.l_name, my_name, NAME_SIZE);
	106	msg.l_name[NAME_SIZE - 1] = '\0';
	107	strncpy(msg.r_name, his_name, NAME_SIZE);
	108	msg.r_name[NAME_SIZE - 1] = '\0';
	109	strncpy(msg.r_tty, his_tty, TTY_SIZE);
	110	msg.r_tty[TTY_SIZE - 1] = '\0';
	111	}