finger.c revision 46662 
1/*
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37/*
38 * Luke Mewburn <lm@rmit.edu.au> added the following on 940622:
39 *    - mail status ("No Mail", "Mail read:...", or "New Mail ...,
40 *	Unread since ...".)
41 *    - 4 digit phone extensions (3210 is printed as x3210.)
42 *    - host/office toggling in short format with -h & -o.
43 *    - short day names (`Tue' printed instead of `Jun 21' if the
44 *	login time is < 6 days.
45 */
46
47#ifndef lint
48static char copyright[] =
49"@(#) Copyright (c) 1989, 1993\n\
50	The Regents of the University of California.  All rights reserved.\n";
51#endif /* not lint */
52
53#ifndef lint
54#if 0
55static char sccsid[] = "@(#)finger.c	8.5 (Berkeley) 5/4/95";
56#else
57static const char rcsid[] =
58	"$Id: finger.c,v 1.12 1997/07/02 06:34:48 charnier Exp $";
59#endif
60#endif /* not lint */
61
62/*
63 * Finger prints out information about users.  It is not portable since
64 * certain fields (e.g. the full user name, office, and phone numbers) are
65 * extracted from the gecos field of the passwd file which other UNIXes
66 * may not have or may use for other things.
67 *
68 * There are currently two output formats; the short format is one line
69 * per user and displays login name, tty, login time, real name, idle time,
70 * and either remote host information (default) or office location/phone
71 * number, depending on if -h or -o is used respectively.
72 * The long format gives the same information (in a more legible format) as
73 * well as home directory, shell, mail info, and .plan/.project files.
74 */
75
76#include <sys/param.h>
77
78#include <db.h>
79#include <err.h>
80#include <errno.h>
81#include <fcntl.h>
82#include <pwd.h>
83#include <stdio.h>
84#include <stdlib.h>
85#include <string.h>
86#include <time.h>
87#include <unistd.h>
88#include <utmp.h>
89#include <db.h>
90#include <locale.h>
91
92#include "finger.h"
93
94DB *db;
95time_t now;
96int entries, lflag, mflag, pplan, sflag, oflag, Tflag;
97char tbuf[1024];
98
99static void loginlist __P((void));
100static void usage __P((void));
101static void userlist __P((int, char **));
102
103int
104option(argc, argv)
105	int argc;
106	char **argv;
107{
108	int ch;
109
110	optind = 1;		/* reset getopt */
111
112	while ((ch = getopt(argc, argv, "lmpshoT")) != -1)
113		switch(ch) {
114		case 'l':
115			lflag = 1;		/* long format */
116			break;
117		case 'm':
118			mflag = 1;		/* force exact match of names */
119			break;
120		case 'p':
121			pplan = 1;		/* don't show .plan/.project */
122			break;
123		case 's':
124			sflag = 1;		/* short format */
125			break;
126		case 'h':
127			oflag = 0;		/* remote host info */
128			break;
129		case 'o':
130			oflag = 1;		/* office info */
131			break;
132		case 'T':
133			Tflag = 1;		/* disable T/TCP */
134			break;
135		case '?':
136		default:
137			usage();
138		}
139
140	return optind;
141}
142
143static void
144usage()
145{
146	(void)fprintf(stderr, "usage: finger [-lmpshoT] [login ...]\n");
147	exit(1);
148}
149
150int
151main(argc, argv)
152	int argc;
153	char **argv;
154{
155	int envargc, argcnt;
156	char *envargv[3];
157	struct passwd *pw;
158
159	if (getuid() == 0 || geteuid() == 0) {
160		if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) {
161			 setgid(pw->pw_gid);
162			 setuid(pw->pw_uid);
163		} else {
164			 setgid(UNPRIV_UGID);
165			 setuid(UNPRIV_UGID);
166		}
167	}
168
169	(void) setlocale(LC_ALL, "");
170
171				/* remove this line to get remote host */
172	oflag = 1;		/* default to old "office" behavior */
173
174	/*
175	 * Process environment variables followed by command line arguments.
176	 */
177	if ((envargv[1] = getenv("FINGER"))) {
178		envargc = 2;
179		envargv[0] = "finger";
180		envargv[2] = NULL;
181		(void) option(envargc, envargv);
182	}
183
184	argcnt = option(argc, argv);
185	argc -= argcnt;
186	argv += argcnt;
187
188	(void)time(&now);
189	setpassent(1);
190	if (!*argv) {
191		/*
192		 * Assign explicit "small" format if no names given and -l
193		 * not selected.  Force the -s BEFORE we get names so proper
194		 * screening will be done.
195		 */
196		if (!lflag)
197			sflag = 1;	/* if -l not explicit, force -s */
198		loginlist();
199		if (entries == 0)
200			(void)printf("No one logged on.\n");
201	} else {
202		userlist(argc, argv);
203		/*
204		 * Assign explicit "large" format if names given and -s not
205		 * explicitly stated.  Force the -l AFTER we get names so any
206		 * remote finger attempts specified won't be mishandled.
207		 */
208		if (!sflag)
209			lflag = 1;	/* if -s not explicit, force -l */
210	}
211	if (entries)
212		if (lflag)
213			lflag_print();
214		else
215			sflag_print();
216	return (0);
217}
218
219static void
220loginlist()
221{
222	register PERSON *pn;
223	DBT data, key;
224	struct passwd *pw;
225	struct utmp user;
226	int r, sflag;
227	char name[UT_NAMESIZE + 1];
228
229	if (!freopen(_PATH_UTMP, "r", stdin))
230		err(1, "%s", _PATH_UTMP);
231	name[UT_NAMESIZE] = '\0';
232	while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
233		if (!user.ut_name[0])
234			continue;
235		if ((pn = find_person(user.ut_name)) == NULL) {
236			bcopy(user.ut_name, name, UT_NAMESIZE);
237			if ((pw = getpwnam(name)) == NULL)
238				continue;
239			if (hide(pw))
240				continue;
241			pn = enter_person(pw);
242		}
243		enter_where(&user, pn);
244	}
245	if (db && lflag)
246		for (sflag = R_FIRST;; sflag = R_NEXT) {
247			PERSON *tmp;
248
249			r = (*db->seq)(db, &key, &data, sflag);
250			if (r == -1)
251				err(1, "db seq");
252			if (r == 1)
253				break;
254			memmove(&tmp, data.data, sizeof tmp);
255			enter_lastlog(tmp);
256		}
257}
258
259static void
260userlist(argc, argv)
261	register int argc;
262	register char **argv;
263{
264	register PERSON *pn;
265	DBT data, key;
266	struct utmp user;
267	struct passwd *pw;
268	int r, sflag, *used, *ip;
269	char **ap, **nargv, **np, **p;
270
271	if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL ||
272	    (used = calloc(argc, sizeof(int))) == NULL)
273		err(1, NULL);
274
275	/* Pull out all network requests. */
276	for (ap = p = argv, np = nargv; *p; ++p)
277		if (index(*p, '@'))
278			*np++ = *p;
279		else
280			*ap++ = *p;
281
282	*np++ = NULL;
283	*ap++ = NULL;
284
285	if (!*argv)
286		goto net;
287
288	/*
289	 * Traverse the list of possible login names and check the login name
290	 * and real name against the name specified by the user.
291	 */
292	if (mflag)
293		for (p = argv; *p; ++p)
294			if (((pw = getpwnam(*p)) != NULL) && !hide(pw))
295				enter_person(pw);
296			else
297				warnx("%s: no such user", *p);
298	else {
299		while ((pw = getpwent()) != NULL) {
300			for (p = argv, ip = used; *p; ++p, ++ip)
301				if (match(pw, *p) && !hide(pw)) {
302					enter_person(pw);
303					*ip = 1;
304				}
305		}
306		for (p = argv, ip = used; *p; ++p, ++ip)
307			if (!*ip)
308				warnx("%s: no such user", *p);
309	}
310
311	/* Handle network requests. */
312net:	for (p = nargv; *p;) {
313		netfinger(*p++);
314		if (*p || entries)
315		    printf("\n");
316	}
317
318	if (entries == 0)
319		return;
320
321	/*
322	 * Scan thru the list of users currently logged in, saving
323	 * appropriate data whenever a match occurs.
324	 */
325	if (!freopen(_PATH_UTMP, "r", stdin))
326		err(1, "%s", _PATH_UTMP);
327	while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
328		if (!user.ut_name[0])
329			continue;
330		if ((pn = find_person(user.ut_name)) == NULL)
331			continue;
332		enter_where(&user, pn);
333	}
334	if (db)
335		for (sflag = R_FIRST;; sflag = R_NEXT) {
336			PERSON *tmp;
337
338			r = (*db->seq)(db, &key, &data, sflag);
339			if (r == -1)
340				err(1, "db seq");
341			if (r == 1)
342				break;
343			memmove(&tmp, data.data, sizeof tmp);
344			enter_lastlog(tmp);
345		}
346}
347