finger.c revision 23693 
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
54static char sccsid[] = "@(#)finger.c	8.5 (Berkeley) 5/4/95";
55#endif /* not lint */
56
57/*
58 * Finger prints out information about users.  It is not portable since
59 * certain fields (e.g. the full user name, office, and phone numbers) are
60 * extracted from the gecos field of the passwd file which other UNIXes
61 * may not have or may use for other things.
62 *
63 * There are currently two output formats; the short format is one line
64 * per user and displays login name, tty, login time, real name, idle time,
65 * and either remote host information (default) or office location/phone
66 * number, depending on if -h or -o is used respectively.
67 * The long format gives the same information (in a more legible format) as
68 * well as home directory, shell, mail info, and .plan/.project files.
69 */
70
71#include <sys/param.h>
72
73#include <db.h>
74#include <err.h>
75#include <errno.h>
76#include <fcntl.h>
77#include <pwd.h>
78#include <stdio.h>
79#include <stdlib.h>
80#include <string.h>
81#include <time.h>
82#include <unistd.h>
83#include <utmp.h>
84#include <db.h>
85#include <locale.h>
86
87#include "finger.h"
88
89DB *db;
90time_t now;
91int entries, lflag, mflag, pplan, sflag, oflag, Tflag;
92char tbuf[1024];
93
94static void loginlist __P((void));
95static void userlist __P((int, char **));
96
97int
98option(argc, argv)
99	int argc;
100	char **argv;
101{
102	int ch;
103
104	optind = 1;		/* reset getopt */
105
106	while ((ch = getopt(argc, argv, "lmpshoT")) != EOF)
107		switch(ch) {
108		case 'l':
109			lflag = 1;		/* long format */
110			break;
111		case 'm':
112			mflag = 1;		/* force exact match of names */
113			break;
114		case 'p':
115			pplan = 1;		/* don't show .plan/.project */
116			break;
117		case 's':
118			sflag = 1;		/* short format */
119			break;
120		case 'h':
121			oflag = 0;		/* remote host info */
122			break;
123		case 'o':
124			oflag = 1;		/* office info */
125			break;
126		case 'T':
127			Tflag = 1;		/* disable T/TCP */
128			break;
129		case '?':
130		default:
131			(void)fprintf(stderr,
132			    "usage: finger [-lmpshoT] [login ...]\n");
133			exit(1);
134		}
135
136	return optind;
137}
138
139main(argc, argv)
140	int argc;
141	char **argv;
142{
143	int ch, envargc, argcnt;
144	char *envargv[3];
145
146	(void) setlocale(LC_ALL, "");
147
148				/* remove this line to get remote host */
149	oflag = 1;		/* default to old "office" behavior */
150
151	/*
152	 * Process environment variables followed by command line arguments.
153	 */
154	if ((envargv[1] = getenv("FINGER"))) {
155		envargc = 2;
156		envargv[0] = "finger";
157		envargv[2] = NULL;
158		(void) option(envargc, envargv);
159	}
160
161	argcnt = option(argc, argv);
162	argc -= argcnt;
163	argv += argcnt;
164
165	(void)time(&now);
166	setpassent(1);
167	if (!*argv) {
168		/*
169		 * Assign explicit "small" format if no names given and -l
170		 * not selected.  Force the -s BEFORE we get names so proper
171		 * screening will be done.
172		 */
173		if (!lflag)
174			sflag = 1;	/* if -l not explicit, force -s */
175		loginlist();
176		if (entries == 0)
177			(void)printf("No one logged on.\n");
178	} else {
179		userlist(argc, argv);
180		/*
181		 * Assign explicit "large" format if names given and -s not
182		 * explicitly stated.  Force the -l AFTER we get names so any
183		 * remote finger attempts specified won't be mishandled.
184		 */
185		if (!sflag)
186			lflag = 1;	/* if -s not explicit, force -l */
187	}
188	if (entries)
189		if (lflag)
190			lflag_print();
191		else
192			sflag_print();
193	return (0);
194}
195
196static void
197loginlist()
198{
199	register PERSON *pn;
200	DBT data, key;
201	struct passwd *pw;
202	struct utmp user;
203	int r, sflag;
204	char name[UT_NAMESIZE + 1];
205
206	if (!freopen(_PATH_UTMP, "r", stdin))
207		err(1, "%s", _PATH_UTMP);
208	name[UT_NAMESIZE] = NULL;
209	while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
210		if (!user.ut_name[0])
211			continue;
212		if ((pn = find_person(user.ut_name)) == NULL) {
213			bcopy(user.ut_name, name, UT_NAMESIZE);
214			if ((pw = getpwnam(name)) == NULL)
215				continue;
216			if (hide(pw))
217				continue;
218			pn = enter_person(pw);
219		}
220		enter_where(&user, pn);
221	}
222	if (db && lflag)
223		for (sflag = R_FIRST;; sflag = R_NEXT) {
224			PERSON *tmp;
225
226			r = (*db->seq)(db, &key, &data, sflag);
227			if (r == -1)
228				err(1, "db seq");
229			if (r == 1)
230				break;
231			memmove(&tmp, data.data, sizeof tmp);
232			enter_lastlog(tmp);
233		}
234}
235
236static void
237userlist(argc, argv)
238	register int argc;
239	register char **argv;
240{
241	register PERSON *pn;
242	DBT data, key;
243	struct utmp user;
244	struct passwd *pw;
245	int r, sflag, *used, *ip;
246	char **ap, **nargv, **np, **p;
247
248	if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL ||
249	    (used = calloc(argc, sizeof(int))) == NULL)
250		err(1, NULL);
251
252	/* Pull out all network requests. */
253	for (ap = p = argv, np = nargv; *p; ++p)
254		if (index(*p, '@'))
255			*np++ = *p;
256		else
257			*ap++ = *p;
258
259	*np++ = NULL;
260	*ap++ = NULL;
261
262	if (!*argv)
263		goto net;
264
265	/*
266	 * Traverse the list of possible login names and check the login name
267	 * and real name against the name specified by the user.
268	 */
269	if (mflag)
270		for (p = argv; *p; ++p)
271			if (((pw = getpwnam(*p)) != NULL) && !hide(pw))
272				enter_person(pw);
273			else
274				(void)fprintf(stderr,
275				    "finger: %s: no such user\n", *p);
276	else {
277		while ((pw = getpwent()) != NULL) {
278			for (p = argv, ip = used; *p; ++p, ++ip)
279				if (match(pw, *p) && !hide(pw)) {
280					enter_person(pw);
281					*ip = 1;
282				}
283		}
284		for (p = argv, ip = used; *p; ++p, ++ip)
285			if (!*ip)
286				(void)fprintf(stderr,
287				    "finger: %s: no such user\n", *p);
288	}
289
290	/* Handle network requests. */
291net:	for (p = nargv; *p;) {
292		netfinger(*p++);
293		if (*p || entries)
294		    printf("\n");
295	}
296
297	if (entries == 0)
298		return;
299
300	/*
301	 * Scan thru the list of users currently logged in, saving
302	 * appropriate data whenever a match occurs.
303	 */
304	if (!freopen(_PATH_UTMP, "r", stdin))
305		err(1, "%s", _PATH_UTMP);
306	while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
307		if (!user.ut_name[0])
308			continue;
309		if ((pn = find_person(user.ut_name)) == NULL)
310			continue;
311		enter_where(&user, pn);
312	}
313	if (db)
314		for (sflag = R_FIRST;; sflag = R_NEXT) {
315			PERSON *tmp;
316
317			r = (*db->seq)(db, &key, &data, sflag);
318			if (r == -1)
319				err(1, "db seq");
320			if (r == 1)
321				break;
322			memmove(&tmp, data.data, sizeof tmp);
323			enter_lastlog(tmp);
324		}
325}
326