1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30/*
31 * Portions of this source code were derived from Berkeley 4.3 BSD
32 * under license from the Regents of the University of California.
33 */
34
35#pragma ident	"%Z%%M%	%I%	%E% SMI"
36
37/*
38 * Finger server.
39 */
40#include <sys/types.h>
41#include <netinet/in.h>
42#include <sys/socket.h>
43#include <stdio.h>
44#include <ctype.h>
45
46#define	MAXARGS 10
47
48void fatal(char *prog, char *s);
49
50int
51main(argc, argv)
52	int argc;
53	char *argv[];
54{
55	register char *sp;
56	char line[512];
57	struct sockaddr_storage sin;
58	pid_t pid, w;
59	int i, p[2], status;
60	FILE *fp;
61	char *av[MAXARGS + 1];
62
63	i = sizeof (sin);
64	if (getpeername(0, (struct sockaddr *)&sin, &i) < 0)
65		fatal(argv[0], "getpeername");
66	line[0] = '\0';
67	if (fgets(line, sizeof (line), stdin) == NULL)
68		exit(1);
69	sp = line;
70	av[0] = "finger";
71	i = 1;
72
73	/* skip past leading white space */
74	while (isspace(*sp))
75		sp++;
76
77	/*
78	 * The finger protocol says a "/W" switch means verbose output.
79	 * We explicitly set either the "long" or "short" output flags
80	 * to the finger program so that we don't have to know what what
81	 * the "finger" program's default is.
82	 */
83	if (*sp == '/' && (sp[1] == 'W' || sp[1] == 'w')) {
84		sp += 2;
85		av[i++] = "-l";
86	} else {
87		av[i++] = "-s";
88	}
89
90	/* look for username arguments */
91	while (i < MAXARGS) {
92
93		/* skip over leading white space */
94		while (isspace(*sp))
95			sp++;
96
97		/* check for end of "command line" */
98		if (*sp == '\0')
99			break;
100
101		/* pick up another name argument */
102		av[i++] = sp;
103		while ((*sp != '\0') && !isspace(*sp))
104			sp++;
105
106		/* check again for end of "command line" */
107		if (*sp == '\0')
108			break;
109		else
110			*sp++ = '\0';
111	}
112
113	av[i] = (char *)0;
114	if (pipe(p) < 0)
115		fatal(argv[0], "pipe");
116
117	if ((pid = fork()) == 0) {
118		close(p[0]);
119		if (p[1] != 1) {
120			dup2(p[1], 1);
121			close(p[1]);
122		}
123		execv("/usr/bin/finger", av);
124		printf("No local finger program found\n");
125		fflush(stdout);
126		_exit(1);
127	}
128	if (pid == (pid_t)-1)
129		fatal(argv[0], "fork");
130	close(p[1]);
131	if ((fp = fdopen(p[0], "r")) == NULL)
132		fatal(argv[0], "fdopen");
133	while ((i = getc(fp)) != EOF) {
134		if (i == '\n')
135			putchar('\r');
136		putchar(i);
137	}
138	fclose(fp);
139	while ((w = wait(&status)) != pid && w != (pid_t)-1)
140		;
141	return (0);
142}
143
144void
145fatal(prog, s)
146	char *prog, *s;
147{
148
149	fprintf(stderr, "%s: ", prog);
150	perror(s);
151	exit(1);
152}
153