1/*	$NetBSD: get_names.c,v 1.9 2009/07/04 02:37:20 dholland Exp $	*/
2/*
3 * Copyright (c) 1983-2003, Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * + Redistributions of source code must retain the above copyright
11 *   notice, this list of conditions and the following disclaimer.
12 * + Redistributions in binary form must reproduce the above copyright
13 *   notice, this list of conditions and the following disclaimer in the
14 *   documentation and/or other materials provided with the distribution.
15 * + Neither the name of the University of California, San Francisco nor
16 *   the names of its contributors may be used to endorse or promote
17 *   products derived from this software without specific prior written
18 *   permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
21 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
23 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34#ifndef lint
35__RCSID("$NetBSD: get_names.c,v 1.9 2009/07/04 02:37:20 dholland Exp $");
36#endif /* not lint */
37
38#include "bsd.h"
39
40#if defined(TALK_43) || defined(TALK_42)
41
42#include <sys/param.h>
43#include <netdb.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48#include "hunt.h"
49#include "talk_ctl.h"
50
51static char hostname[MAXHOSTNAMELEN + 1];
52char *my_machine_name;
53
54/*
55 * Determine the local user and machine
56 */
57void
58get_local_name(char *my_name)
59{
60	struct hostent *hp;
61	struct servent *sp;
62
63	/* Load these useful values into the standard message header */
64	msg.id_num = 0;
65	(void) strncpy(msg.l_name, my_name, NAME_SIZE);
66	msg.l_name[NAME_SIZE - 1] = '\0';
67	msg.r_tty[0] = '\0';
68	msg.pid = getpid();
69#ifdef TALK_43
70	msg.vers = TALK_VERSION;
71	msg.addr.sa_family = htons(AF_INET);
72	msg.ctl_addr.sa_family = htons(AF_INET);
73#else
74	msg.addr.sin_family = htons(AF_INET);
75	msg.ctl_addr.sin_family = htons(AF_INET);
76#endif
77
78	(void)gethostname(hostname, sizeof (hostname));
79	hostname[sizeof(hostname) - 1] = '\0';
80	my_machine_name = hostname;
81	/* look up the address of the local host */
82	hp = gethostbyname(my_machine_name);
83	if (hp == (struct hostent *) 0) {
84#ifdef LOG
85		syslog(LOG_ERR,
86		    "This machine doesn't exist. Boy, am I confused!");
87#else
88		perror("This machine doesn't exist. Boy, am I confused!");
89#endif
90		exit(1);
91	}
92	memcpy(&my_machine_addr, hp->h_addr, hp->h_length);
93	/* find the daemon portal */
94#ifdef TALK_43
95	sp = getservbyname("ntalk", "udp");
96#else
97	sp = getservbyname("talk", "udp");
98#endif
99	if (sp == 0) {
100#ifdef LOG
101		syslog(LOG_ERR, "This machine doesn't support talk");
102#else
103		perror("This machine doesn't support talk");
104#endif
105		exit(1);
106	}
107	daemon_port = sp->s_port;
108}
109
110/*
111 * Determine the remote user and machine
112 */
113int
114get_remote_name(char *his_address)
115{
116	char *his_name;
117	char *his_machine_name;
118	char *ptr;
119	struct hostent *hp;
120
121	/* check for, and strip out, the machine name of the target */
122	for (ptr = his_address; *ptr != '\0' && *ptr != '@' && *ptr != ':'
123					&& *ptr != '!' && *ptr != '.'; ptr++)
124		continue;
125	if (*ptr == '\0') {
126		/* this is a local to local talk */
127		his_name = his_address;
128		his_machine_name = my_machine_name;
129	} else {
130		if (*ptr == '@') {
131			/* user@host */
132			his_name = his_address;
133			his_machine_name = ptr + 1;
134		} else {
135			/* host.user or host!user or host:user */
136			his_name = ptr + 1;
137			his_machine_name = his_address;
138		}
139		*ptr = '\0';
140	}
141	/* Load these useful values into the standard message header */
142	(void) strncpy(msg.r_name, his_name, NAME_SIZE);
143	msg.r_name[NAME_SIZE - 1] = '\0';
144
145	/* if he is on the same machine, then simply copy */
146	if (memcmp(&his_machine_name, &my_machine_name,
147						sizeof(his_machine_name)) == 0)
148		memcpy(&his_machine_addr, &my_machine_addr,
149						sizeof(his_machine_name));
150	else {
151		/* look up the address of the recipient's machine */
152		hp = gethostbyname(his_machine_name);
153		if (hp == (struct hostent *) 0)
154			return 0;			/* unknown host */
155		memcpy(&his_machine_addr, hp->h_addr, hp->h_length);
156	}
157	return 1;
158}
159#endif
160