fingerd.c revision 1.2 
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 1.2 1996/05/30 08:44:11 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	int i;
57
58#ifdef LOGGING					/* unused for now */
59#include <netinet/in.h>
60	struct sockaddr_in sin;
61	int sval;
62
63	sval = sizeof(sin);
64	if (getpeername(0, &sin, &sval) < 0)
65		fatal("getpeername");
66#endif
67
68	if (!fgets(line, sizeof(line), stdin))
69		exit(1);
70
71	av[0] = "finger";
72	for (lp = line, ap = &av[1];;) {
73		*ap = strtok(lp, " \t\r\n");
74		if (!*ap)
75			break;
76		/* RFC742: "/[Ww]" == "-l" */
77		if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w'))
78			*ap = "-l";
79		if (++ap == av + ENTRIES)
80			break;
81		lp = NULL;
82	}
83
84	for (i = 1; av[i]; i++) {
85		int l = strlen(av[i]);
86
87		while (av[i][l-1] == '@')
88			av[i][--l] = '\0';
89		if (av[i][0] == '\0')
90			av[i] = NULL;
91	}
92
93	if (pipe(p) < 0)
94		fatal("pipe");
95
96	switch(fork()) {
97	case 0:
98		(void)close(p[0]);
99		if (p[1] != 1) {
100			(void)dup2(p[1], 1);
101			(void)close(p[1]);
102		}
103		execv(_PATH_FINGER, av);
104		_exit(1);
105	case -1:
106		fatal("fork");
107	}
108	(void)close(p[1]);
109	if (!(fp = fdopen(p[0], "r")))
110		fatal("fdopen");
111	while ((ch = getc(fp)) != EOF) {
112		if (ch == '\n')
113			putchar('\r');
114		putchar(ch);
115	}
116	exit(0);
117}
118
119fatal(msg)
120	char *msg;
121{
122	extern int errno;
123	char *strerror();
124
125	fprintf(stderr, "fingerd: %s: %s\r\n", msg, strerror(errno));
126	exit(1);
127}
128