1/*	$NetBSD: net.c,v 1.22 2006/01/04 01:17:54 perry Exp $	*/
2
3/*
4 * Copyright (c) 1989, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)net.c	8.4 (Berkeley) 4/28/95";
39#else
40__RCSID("$NetBSD: net.c,v 1.22 2006/01/04 01:17:54 perry Exp $");
41#endif
42#endif /* not lint */
43
44#include <sys/types.h>
45#include <sys/socket.h>
46
47#include <netinet/in.h>
48
49#include <arpa/inet.h>
50
51#include <netdb.h>
52#include <time.h>
53#include <db.h>
54#include <unistd.h>
55#include <pwd.h>
56#include <stdio.h>
57#include <string.h>
58#include <ctype.h>
59#include <err.h>
60
61#include "utmpentry.h"
62
63#include "finger.h"
64#include "extern.h"
65
66void
67netfinger(char *name)
68{
69	FILE *fp;
70	int c, lastc;
71	int s;
72	char *host;
73	struct addrinfo hints, *res, *res0;
74	int error;
75	const char *emsg = NULL;
76
77	lastc = 0;
78	if (!(host = strrchr(name, '@')))
79		return;
80	*host++ = '\0';
81	memset(&hints, 0, sizeof(hints));
82	hints.ai_family = PF_UNSPEC;
83	hints.ai_socktype = SOCK_STREAM;
84	hints.ai_flags = AI_CANONNAME;
85	error = getaddrinfo(host, "finger", &hints, &res0);
86	if (error) {
87		warnx("%s: %s", gai_strerror(error), host);
88		return;
89	}
90
91	s = -1;
92	for (res = res0; res; res = res->ai_next) {
93		s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
94		if (s < 0) {
95			emsg = "socket";
96			continue;
97		}
98
99		if (connect(s, res->ai_addr, res->ai_addrlen)) {
100			close(s);
101			s = -1;
102			emsg = "connect";
103			continue;
104		}
105
106		break;
107	}
108	if (s < 0) {
109		if (emsg != NULL)
110			warn("%s", emsg);
111		return;
112	}
113
114	/* have network connection; identify the host connected with */
115	(void)printf("[%s]\n", res0->ai_canonname ? res0->ai_canonname : host);
116
117	/* -l flag for remote fingerd  */
118	if (lflag)
119		write(s, "/W ", 3);
120	/* send the name followed by <CR><LF> */
121	(void)write(s, name, strlen(name));
122	(void)write(s, "\r\n", 2);
123
124	/*
125	 * Read from the remote system; once we're connected, we assume some
126	 * data.  If none arrives, we hang until the user interrupts.
127	 *
128	 * If we see a <CR> followed by a newline character, only output
129	 * one newline.
130	 *
131	 * If a character isn't printable and it isn't a space, we strip the
132	 * 8th bit and set the 7th bit.  Every ASCII character with bit 7 set
133	 * is printable.
134	 */
135	if ((fp = fdopen(s, "r")) != NULL)
136		while ((c = getc(fp)) != EOF) {
137			if (c == '\r') {
138				if (lastc == '\r')	/* ^M^M - skip dupes */
139					continue;
140				c = '\n';
141				lastc = '\r';
142			} else {
143				if (!(eightflag || isprint(c) || isspace(c))) {
144					c &= 0x7f;
145					c |= 0x40;
146				}
147				if (lastc != '\r' || c != '\n')
148					lastc = c;
149				else {
150					lastc = '\n';
151					continue;
152				}
153			}
154			putchar(c);
155		}
156	if (lastc != '\n')
157		putchar('\n');
158	(void)fclose(fp);
159}
160