[unix-history] / usr / src / usr.bin / talk / get_names.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * 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.
 */

#ifndef lint
static char sccsid[] = "@(#)get_names.c	5.9 (Berkeley) 3/1/91";
#endif /* not lint */

#include <sys/param.h>
#include <sys/socket.h>
#include <protocols/talkd.h>
#include <pwd.h>
#include "talk.h"

char	*getlogin();
char	*ttyname();
char	*rindex();
extern	CTL_MSG msg;

/*
 * Determine the local and remote user, tty, and machines
 */
get_names(argc, argv)
	int argc;
	char *argv[];
{
	char hostname[MAXHOSTNAMELEN];
	char *his_name, *my_name;
	char *my_machine_name, *his_machine_name;
	char *my_tty, *his_tty;
	register char *cp;

	if (argc < 2 ) {
		printf("Usage: talk user [ttyname]\n");
		exit(-1);
	}
	if (!isatty(0)) {
		printf("Standard input must be a tty, not a pipe or a file\n");
		exit(-1);
	}
	if ((my_name = getlogin()) == NULL) {
		struct passwd *pw;

		if ((pw = getpwuid(getuid())) == NULL) {
			printf("You don't exist. Go away.\n");
			exit(-1);
		}
		my_name = pw->pw_name;
	}
	gethostname(hostname, sizeof (hostname));
	my_machine_name = hostname;
	/* check for, and strip out, the machine name of the target */
	for (cp = argv[1]; *cp && !index("@:!.", *cp); cp++)
		;
	if (*cp == '\0') {
		/* this is a local to local talk */
		his_name = argv[1];
		his_machine_name = my_machine_name;
	} else {
		if (*cp++ == '@') {
			/* user@host */
			his_name = argv[1];
			his_machine_name = cp;
		} else {
			/* host.user or host!user or host:user */
			his_name = cp;
			his_machine_name = argv[1];
		}
		*--cp = '\0';
	}
	if (argc > 2)
		his_tty = argv[2];	/* tty name is arg 2 */
	else
		his_tty = "";
	get_addrs(my_machine_name, his_machine_name);
	/*
	 * Initialize the message template.
	 */
	msg.vers = TALK_VERSION;
	msg.addr.sa_family = htons(AF_INET);
	msg.ctl_addr.sa_family = htons(AF_INET);
	msg.id_num = htonl(0);
	strncpy(msg.l_name, my_name, NAME_SIZE);
	msg.l_name[NAME_SIZE - 1] = '\0';
	strncpy(msg.r_name, his_name, NAME_SIZE);
	msg.r_name[NAME_SIZE - 1] = '\0';
	strncpy(msg.r_tty, his_tty, TTY_SIZE);
	msg.r_tty[TTY_SIZE - 1] = '\0';
}
Commit	Line	Data
31c4d32d WJ	1	/*
	2	* Copyright (c) 1983 Regents of the University of California.
	3	* 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. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#ifndef lint
	35	static char sccsid[] = "@(#)get_names.c 5.9 (Berkeley) 3/1/91";
	36	#endif /* not lint */
	37
	38	#include <sys/param.h>
	39	#include <sys/socket.h>
	40	#include <protocols/talkd.h>
	41	#include <pwd.h>
	42	#include "talk.h"
	43
	44	char *getlogin();
	45	char *ttyname();
	46	char *rindex();
	47	extern CTL_MSG msg;
	48
	49	/*
	50	* Determine the local and remote user, tty, and machines
	51	*/
	52	get_names(argc, argv)
	53	int argc;
	54	char *argv[];
	55	{
	56	char hostname[MAXHOSTNAMELEN];
	57	char his_name, my_name;
	58	char my_machine_name, his_machine_name;
	59	char my_tty, his_tty;
	60	register char *cp;
	61
	62	if (argc < 2 ) {
	63	printf("Usage: talk user [ttyname]\n");
	64	exit(-1);
65	}
66	if (!isatty(0)) {
67	printf("Standard input must be a tty, not a pipe or a file\n");
68	exit(-1);
69	}
70	if ((my_name = getlogin()) == NULL) {
71	struct passwd *pw;
72
73	if ((pw = getpwuid(getuid())) == NULL) {
74	printf("You don't exist. Go away.\n");
75	exit(-1);
76	}
77	my_name = pw->pw_name;
78	}
79	gethostname(hostname, sizeof (hostname));
80	my_machine_name = hostname;
81	/* check for, and strip out, the machine name of the target */
82	for (cp = argv[1]; cp && !index("@:!.", cp); cp++)
83	;
84	if (*cp == '\0') {
85	/* this is a local to local talk */
86	his_name = argv[1];
87	his_machine_name = my_machine_name;
88	} else {
89	if (*cp++ == '@') {
90	/* user@host */
91	his_name = argv[1];
92	his_machine_name = cp;
93	} else {
94	/* host.user or host!user or host:user */
95	his_name = cp;
96	his_machine_name = argv[1];
97	}
98	*--cp = '\0';
99	}
100	if (argc > 2)
101	his_tty = argv[2]; /* tty name is arg 2 */
102	else
103	his_tty = "";
104	get_addrs(my_machine_name, his_machine_name);
105	/*
106	* Initialize the message template.
107	*/
108	msg.vers = TALK_VERSION;
109	msg.addr.sa_family = htons(AF_INET);
110	msg.ctl_addr.sa_family = htons(AF_INET);
111	msg.id_num = htonl(0);
112	strncpy(msg.l_name, my_name, NAME_SIZE);
113	msg.l_name[NAME_SIZE - 1] = '\0';
114	strncpy(msg.r_name, his_name, NAME_SIZE);
115	msg.r_name[NAME_SIZE - 1] = '\0';
116	strncpy(msg.r_tty, his_tty, TTY_SIZE);
117	msg.r_tty[TTY_SIZE - 1] = '\0';
118	}