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 1.13 1999/05/08 00:46:04 obrien 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 }
217 return (0);
218}
219
220static void
221loginlist()
222{
223 register PERSON *pn;
224 DBT data, key;
225 struct passwd *pw;
226 struct utmp user;
227 int r, sflag;
228 char name[UT_NAMESIZE + 1];
229
230 if (!freopen(_PATH_UTMP, "r", stdin))
231 err(1, "%s", _PATH_UTMP);
232 name[UT_NAMESIZE] = '\0';
233 while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
234 if (!user.ut_name[0])
235 continue;
236 if ((pn = find_person(user.ut_name)) == NULL) {
237 bcopy(user.ut_name, name, UT_NAMESIZE);
238 if ((pw = getpwnam(name)) == NULL)
239 continue;
240 if (hide(pw))
241 continue;
242 pn = enter_person(pw);
243 }
244 enter_where(&user, pn);
245 }
246 if (db && lflag)
247 for (sflag = R_FIRST;; sflag = R_NEXT) {
248 PERSON *tmp;
249
250 r = (*db->seq)(db, &key, &data, sflag);
251 if (r == -1)
252 err(1, "db seq");
253 if (r == 1)
254 break;
255 memmove(&tmp, data.data, sizeof tmp);
256 enter_lastlog(tmp);
257 }
258}
259
260static void
261userlist(argc, argv)
262 register int argc;
263 register char **argv;
264{
265 register PERSON *pn;
266 DBT data, key;
267 struct utmp user;
268 struct passwd *pw;
269 int r, sflag, *used, *ip;
270 char **ap, **nargv, **np, **p;
271
272 if ((nargv = malloc((argc+1) * sizeof(char *))) == NULL ||
273 (used = calloc(argc, sizeof(int))) == NULL)
274 err(1, NULL);
275
276 /* Pull out all network requests. */
277 for (ap = p = argv, np = nargv; *p; ++p)
278 if (index(*p, '@'))
279 *np++ = *p;
280 else
281 *ap++ = *p;
282
283 *np++ = NULL;
284 *ap++ = NULL;
285
286 if (!*argv)
287 goto net;
288
289 /*
290 * Traverse the list of possible login names and check the login name
291 * and real name against the name specified by the user.
292 */
293 if (mflag)
294 for (p = argv; *p; ++p)
295 if (((pw = getpwnam(*p)) != NULL) && !hide(pw))
296 enter_person(pw);
297 else
298 warnx("%s: no such user", *p);
299 else {
300 while ((pw = getpwent()) != NULL) {
301 for (p = argv, ip = used; *p; ++p, ++ip)
302 if (match(pw, *p) && !hide(pw)) {
303 enter_person(pw);
304 *ip = 1;
305 }
306 }
307 for (p = argv, ip = used; *p; ++p, ++ip)
308 if (!*ip)
309 warnx("%s: no such user", *p);
310 }
311
312 /* Handle network requests. */
313net: for (p = nargv; *p;) {
314 netfinger(*p++);
315 if (*p || entries)
316 printf("\n");
317 }
318
319 if (entries == 0)
320 return;
321
322 /*
323 * Scan thru the list of users currently logged in, saving
324 * appropriate data whenever a match occurs.
325 */
326 if (!freopen(_PATH_UTMP, "r", stdin))
327 err(1, "%s", _PATH_UTMP);
328 while (fread((char *)&user, sizeof(user), 1, stdin) == 1) {
329 if (!user.ut_name[0])
330 continue;
331 if ((pn = find_person(user.ut_name)) == NULL)
332 continue;
333 enter_where(&user, pn);
334 }
335 if (db)
336 for (sflag = R_FIRST;; sflag = R_NEXT) {
337 PERSON *tmp;
338
339 r = (*db->seq)(db, &key, &data, sflag);
340 if (r == -1)
341 err(1, "db seq");
342 if (r == 1)
343 break;
344 memmove(&tmp, data.data, sizeof tmp);
345 enter_lastlog(tmp);
346 }
347}