finger.c revision 87229 
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#include <sys/cdefs.h>
48
49__FBSDID("$FreeBSD: head/usr.bin/finger/finger.c 87229 2001-12-02 20:13:42Z markm $");
50
51#ifndef lint
52static const char copyright[] =
53"@(#) Copyright (c) 1989, 1993\n\
54	The Regents of the University of California.  All rights reserved.\n";
55#endif /* not lint */
56
57#ifndef lint
58static const char sccsid[] = "@(#)finger.c	8.5 (Berkeley) 5/4/95";
59#endif
60
61/*
62 * Finger prints out information about users.  It is not portable since
63 * certain fields (e.g. the full user name, office, and phone numbers) are
64 * extracted from the gecos field of the passwd file which other UNIXes
65 * may not have or may use for other things.
66 *
67 * There are currently two output formats; the short format is one line
68 * per user and displays login name, tty, login time, real name, idle time,
69 * and either remote host information (default) or office location/phone
70 * number, depending on if -h or -o is used respectively.
71 * The long format gives the same information (in a more legible format) as
72 * well as home directory, shell, mail info, and .plan/.project files.
73 */
74
75#include <db.h>
76#include <err.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 <locale.h>
85
86#include "finger.h"
87#include "pathnames.h"
88
89DB *db;
90time_t now;
91int entries, lflag, mflag, pplan, sflag, oflag, Tflag;
92int d_first = -1;
93char tbuf[1024];
94
95static void loginlist __P((void));
96static int option __P((int, char **));
97static void usage __P((void));
98static void userlist __P((int, char **));
99
100static int
101option(argc, argv)
102	int argc;
103	char **argv;
104{
105	int ch;
106
107	optind = 1;		/* reset getopt */
108
109	while ((ch = getopt(argc, argv, "lmpshoT")) != -1)
110		switch(ch) {
111		case 'l':
112			lflag = 1;		/* long format */
113			break;
114		case 'm':
115			mflag = 1;		/* force exact match of names */
116			break;
117		case 'p':
118			pplan = 1;		/* don't show .plan/.project */
119			break;
120		case 's':
121			sflag = 1;		/* short format */
122			break;
123		case 'h':
124			oflag = 0;		/* remote host info */
125			break;
126		case 'o':
127			oflag = 1;		/* office info */
128			break;
129		case 'T':
130			Tflag = 1;		/* disable T/TCP */
131			break;
132		case '?':
133		default:
134			usage();
135		}
136
137	return optind;
138}
139
140static void
141usage()
142{
143	(void)fprintf(stderr, "usage: finger [-lmpshoT] [login ...]\n");
144	exit(1);
145}
146
147int
148main(argc, argv)
149	int argc;
150	char **argv;
151{
152	int envargc, argcnt;
153	char *envargv[3];
154	struct passwd *pw;
155	static char myname[] = "finger";
156
157	if (getuid() == 0 || geteuid() == 0) {
158		if ((pw = getpwnam(UNPRIV_NAME)) && pw->pw_uid > 0) {
159			 setgid(pw->pw_gid);
160			 setuid(pw->pw_uid);
161		} else {
162			 setgid(UNPRIV_UGID);
163			 setuid(UNPRIV_UGID);
164		}
165	}
166
167	(void) setlocale(LC_ALL, "");
168
169				/* remove this line to get remote host */
170	oflag = 1;		/* default to old "office" behavior */
171
172	/*
173	 * Process environment variables followed by command line arguments.
174	 */
175	if ((envargv[1] = getenv("FINGER"))) {
176		envargc = 2;
177		envargv[0] = myname;
178		envargv[2] = NULL;
179		(void) option(envargc, envargv);
180	}
181
182	argcnt = option(argc, argv);
183	argc -= argcnt;
184	argv += argcnt;
185
186	(void)time(&now);
187	setpassent(1);
188	if (!*argv) {
189		/*
190		 * Assign explicit "small" format if no names given and -l
191		 * not selected.  Force the -s BEFORE we get names so proper
192		 * screening will be done.
193		 */
194		if (!lflag)
195			sflag = 1;	/* if -l not explicit, force -s */
196		loginlist();
197		if (entries == 0)
198			(void)printf("No one logged on.\n");
199	} else {
200		userlist(argc, argv);
201		/*
202		 * Assign explicit "large" format if names given and -s not
203		 * explicitly stated.  Force the -l AFTER we get names so any
204		 * remote finger attempts specified won't be mishandled.
205		 */
206		if (!sflag)
207			lflag = 1;	/* if -s not explicit, force -l */
208	}
209	if (entries) {
210		if (lflag)
211			lflag_print();
212		else
213			sflag_print();
214	}
215	return (0);
216}
217
218static void
219loginlist()
220{
221	PERSON *pn;
222	DBT data, key;
223	struct passwd *pw;
224	struct utmp user;
225	int r, sflag1;
226	char name[UT_NAMESIZE + 1];
227
228	if (!freopen(_PATH_UTMP, "r", stdin))
229		err(1, "%s", _PATH_UTMP);
230	name[UT_NAMESIZE] = '\0';
231	while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
232		if (!user.ut_name[0])
233			continue;
234		if ((pn = find_person(user.ut_name)) == NULL) {
235			bcopy(user.ut_name, name, UT_NAMESIZE);
236			if ((pw = getpwnam(name)) == NULL)
237				continue;
238			if (hide(pw))
239				continue;
240			pn = enter_person(pw);
241		}
242		enter_where(&user, pn);
243	}
244	if (db && lflag)
245		for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
246			PERSON *tmp;
247
248			r = (*db->seq)(db, &key, &data, sflag1);
249			if (r == -1)
250				err(1, "db seq");
251			if (r == 1)
252				break;
253			memmove(&tmp, data.data, sizeof tmp);
254			enter_lastlog(tmp);
255		}
256}
257
258static void
259userlist(argc, argv)
260	int argc;
261	char **argv;
262{
263	PERSON *pn;
264	DBT data, key;
265	struct utmp user;
266	struct passwd *pw;
267	int r, sflag1, *used, *ip;
268	char **ap, **nargv, **np, **p;
269	FILE *conf_fp;
270	char conf_alias[LINE_MAX];
271	char *conf_realname;
272	int conf_length;
273
274	if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL ||
275	    (used = calloc(argc, sizeof(int))) == NULL)
276		err(1, NULL);
277
278	/* Pull out all network requests. */
279	for (ap = p = argv, np = nargv; *p; ++p)
280		if (index(*p, '@'))
281			*np++ = *p;
282		else
283			*ap++ = *p;
284
285	*np++ = NULL;
286	*ap++ = NULL;
287
288	if (!*argv)
289		goto net;
290
291	/*
292	 * Mark any arguments beginning with '/' as invalid so that we
293	 * don't accidently confuse them with expansions from finger.conf
294	 */
295	for (p = argv, ip = used; *p; ++p, ++ip)
296	    if (**p == '/') {
297		*ip = 1;
298		warnx("%s: no such user", *p);
299	    }
300
301	/*
302	 * Traverse the finger alias configuration file of the form
303	 * alias:(user|alias), ignoring comment lines beginning '#'.
304	 */
305	if ((conf_fp = fopen(_PATH_FINGERCONF, "r")) != NULL) {
306	    while(fgets(conf_alias, sizeof(conf_alias), conf_fp) != NULL) {
307		conf_length = strlen(conf_alias);
308		if (*conf_alias == '#' || conf_alias[--conf_length] != '\n')
309		    continue;
310		conf_alias[conf_length] = '\0';      /* Remove trailing LF */
311		if ((conf_realname = strchr(conf_alias, ':')) == NULL)
312		    continue;
313		*conf_realname = '\0';               /* Replace : with NUL */
314		for (p = argv; *p; ++p) {
315		    if (strcmp(*p, conf_alias) == NULL) {
316			if ((*p = strdup(conf_realname+1)) == NULL) {
317			    err(1, NULL);
318			}
319		    }
320		}
321	    }
322	    (void)fclose(conf_fp);
323	}
324
325	/*
326	 * Traverse the list of possible login names and check the login name
327	 * and real name against the name specified by the user. If the name
328	 * begins with a '/', try to read the file of that name instead of
329	 * gathering the traditional finger information.
330	 */
331	if (mflag)
332		for (p = argv, ip = used; *p; ++p, ++ip) {
333			if (**p != '/' || *ip == 1 || !show_text("", *p, "")) {
334				if (((pw = getpwnam(*p)) != NULL) && !hide(pw))
335					enter_person(pw);
336				else if (!*ip)
337					warnx("%s: no such user", *p);
338			}
339		}
340	else {
341		while ((pw = getpwent()) != NULL) {
342			for (p = argv, ip = used; *p; ++p, ++ip)
343				if (**p == '/' && *ip != 1
344				    && show_text("", *p, ""))
345					*ip = 1;
346				else if (match(pw, *p) && !hide(pw)) {
347					enter_person(pw);
348					*ip = 1;
349				}
350		}
351		for (p = argv, ip = used; *p; ++p, ++ip)
352			if (!*ip)
353				warnx("%s: no such user", *p);
354	}
355
356	/* Handle network requests. */
357net:	for (p = nargv; *p;) {
358		netfinger(*p++);
359		if (*p || entries)
360		    printf("\n");
361	}
362
363	if (entries == 0)
364		return;
365
366	/*
367	 * Scan thru the list of users currently logged in, saving
368	 * appropriate data whenever a match occurs.
369	 */
370	if (!freopen(_PATH_UTMP, "r", stdin))
371		err(1, "%s", _PATH_UTMP);
372	while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
373		if (!user.ut_name[0])
374			continue;
375		if ((pn = find_person(user.ut_name)) == NULL)
376			continue;
377		enter_where(&user, pn);
378	}
379	if (db)
380		for (sflag1 = R_FIRST;; sflag1 = R_NEXT) {
381			PERSON *tmp;
382
383			r = (*db->seq)(db, &key, &data, sflag1);
384			if (r == -1)
385				err(1, "db seq");
386			if (r == 1)
387				break;
388			memmove(&tmp, data.data, sizeof tmp);
389			enter_lastlog(tmp);
390		}
391}
392