fingerd.c revision 1.1 
1/*
2 * Copyright (c) 1983 The 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
35char copyright[] =
36"@(#) Copyright (c) 1983 The Regents of the University of California.\n\
37 All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41/*static char sccsid[] = "from: @(#)fingerd.c	5.6 (Berkeley) 6/1/90";*/
42static char rcsid[] = "$Id: fingerd.c,v 1.1 1995/10/18 08:43:15 deraadt Exp $";
43#endif /* not lint */
44
45#include <stdio.h>
46#include "pathnames.h"
47
48main()
49{
50	register FILE *fp;
51	register int ch;
52	register char *lp;
53	int p[2];
54#define	ENTRIES	50
55	char **ap, *av[ENTRIES + 1], line[1024], *strtok();
56
57#ifdef LOGGING					/* unused for now */
58#include <netinet/in.h>
59	struct sockaddr_in sin;
60	int sval;
61
62	sval = sizeof(sin);
63	if (getpeername(0, &sin, &sval) < 0)
64		fatal("getpeername");
65#endif
66
67	if (!fgets(line, sizeof(line), stdin))
68		exit(1);
69
70	av[0] = "finger";
71	for (lp = line, ap = &av[1];;) {
72		*ap = strtok(lp, " \t\r\n");
73		if (!*ap)
74			break;
75		/* RFC742: "/[Ww]" == "-l" */
76		if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w'))
77			*ap = "-l";
78		if (++ap == av + ENTRIES)
79			break;
80		lp = NULL;
81	}
82
83	if (pipe(p) < 0)
84		fatal("pipe");
85
86	switch(fork()) {
87	case 0:
88		(void)close(p[0]);
89		if (p[1] != 1) {
90			(void)dup2(p[1], 1);
91			(void)close(p[1]);
92		}
93		execv(_PATH_FINGER, av);
94		_exit(1);
95	case -1:
96		fatal("fork");
97	}
98	(void)close(p[1]);
99	if (!(fp = fdopen(p[0], "r")))
100		fatal("fdopen");
101	while ((ch = getc(fp)) != EOF) {
102		if (ch == '\n')
103			putchar('\r');
104		putchar(ch);
105	}
106	exit(0);
107}
108
109fatal(msg)
110	char *msg;
111{
112	extern int errno;
113	char *strerror();
114
115	fprintf(stderr, "fingerd: %s: %s\r\n", msg, strerror(errno));
116	exit(1);
117}
118