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#if 0
38#ifndef lint
39static char sccsid[] = "@(#)util.c 8.3 (Berkeley) 4/28/95";
40#endif
41#endif
42
43#include <sys/cdefs.h>
44__FBSDID("$FreeBSD: head/usr.bin/finger/util.c 200462 2009-12-13 03:14:06Z delphij $");
45
46#include <sys/param.h>
47#include <sys/socket.h>
48#include <sys/stat.h>
49#include <ctype.h>
50#include <db.h>
51#include <err.h>
52#include <errno.h>
53#include <fcntl.h>
54#include <paths.h>
55#include <pwd.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59#include <unistd.h>
60#include <utmp.h>
61#include "finger.h"
62#include "pathnames.h"
63
64static void find_idle_and_ttywrite(WHERE *);
65static void userinfo(PERSON *, struct passwd *);
66static WHERE *walloc(PERSON *);
67
68int
69match(struct passwd *pw, const char *user)
70{
71 char *p, *t;
72 char name[1024];
73
74 if (!strcasecmp(pw->pw_name, user))
75 return(1);
76
77 /*
78 * XXX
79 * Why do we skip asterisks!?!?
80 */
81 (void)strncpy(p = tbuf, pw->pw_gecos, sizeof(tbuf));
82 tbuf[sizeof(tbuf) - 1] = '\0';
83 if (*p == '*')
84 ++p;
85
86 /* Ampersands get replaced by the login name. */
87 if ((p = strtok(p, ",")) == NULL)
88 return(0);
89
90 for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
91 if (*t == '&') {
92 (void)strncpy(t, pw->pw_name,
93 sizeof(name) - (t - name));
94 name[sizeof(name) - 1] = '\0';
95 while (t < &name[sizeof(name) - 1] && *++t)
96 continue;
97 } else {
98 ++t;
99 }
100 }
101 *t = '\0';
102 for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL)
103 if (!strcasecmp(p, user))
104 return(1);
105 return(0);
106}
107
108void
109enter_lastlog(PERSON *pn)
110{
111 WHERE *w;
112 static int opened, fd;
113 struct lastlog ll;
114 char doit = 0;
115
116 /* some systems may not maintain lastlog, don't report errors. */
117 if (!opened) {
118 fd = open(_PATH_LASTLOG, O_RDONLY, 0);
119 opened = 1;
120 }
121 if (fd == -1 ||
122 lseek(fd, (long)pn->uid * sizeof(ll), SEEK_SET) !=
123 (long)pn->uid * sizeof(ll) ||
124 read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) {
125 /* as if never logged in */
126 ll.ll_line[0] = ll.ll_host[0] = '\0';
127 ll.ll_time = 0;
128 }
129 if ((w = pn->whead) == NULL)
130 doit = 1;
131 else if (ll.ll_time != 0) {
132 /* if last login is earlier than some current login */
133 for (; !doit && w != NULL; w = w->next)
134 if (w->info == LOGGEDIN && w->loginat < ll.ll_time)
135 doit = 1;
136 /*
137 * and if it's not any of the current logins
138 * can't use time comparison because there may be a small
139 * discrepancy since login calls time() twice
140 */
141 for (w = pn->whead; doit && w != NULL; w = w->next)
142 if (w->info == LOGGEDIN &&
143 strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0)
144 doit = 0;
145 }
146 if (doit) {
147 w = walloc(pn);
148 w->info = LASTLOG;
149 bcopy(ll.ll_line, w->tty, UT_LINESIZE);
150 w->tty[UT_LINESIZE] = 0;
151 bcopy(ll.ll_host, w->host, UT_HOSTSIZE);
152 w->host[UT_HOSTSIZE] = 0;
153 w->loginat = ll.ll_time;
154 }
155}
156
157void
158enter_where(struct utmp *ut, PERSON *pn)
159{
160 WHERE *w;
161
162 w = walloc(pn);
163 w->info = LOGGEDIN;
164 bcopy(ut->ut_line, w->tty, UT_LINESIZE);
165 w->tty[UT_LINESIZE] = 0;
166 bcopy(ut->ut_host, w->host, UT_HOSTSIZE);
167 w->host[UT_HOSTSIZE] = 0;
168 w->loginat = (time_t)ut->ut_time;
169 find_idle_and_ttywrite(w);
170}
171
172PERSON *
173enter_person(struct passwd *pw)
174{
175 DBT data, key;
176 PERSON *pn;
177
178 if (db == NULL &&
179 (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
180 err(1, NULL);
181
182 key.data = pw->pw_name;
183 key.size = strlen(pw->pw_name);
184
185 switch ((*db->get)(db, &key, &data, 0)) {
186 case 0:
187 memmove(&pn, data.data, sizeof pn);
188 return (pn);
189 default:
190 case -1:
191 err(1, "db get");
192 /* NOTREACHED */
193 case 1:
194 ++entries;
195 pn = palloc();
196 userinfo(pn, pw);
197 pn->whead = NULL;
198
199 data.size = sizeof(PERSON *);
200 data.data = &pn;
201 if ((*db->put)(db, &key, &data, 0))
202 err(1, "db put");
203 return (pn);
204 }
205}
206
207PERSON *
208find_person(const char *name)
209{
210 struct passwd *pw;
211
212 int cnt;
213 DBT data, key;
214 PERSON *p;
215 char buf[UT_NAMESIZE + 1];
216
217 if (!db)
218 return(NULL);
219
220 if ((pw = getpwnam(name)) && hide(pw))
221 return(NULL);
222
223 /* Name may be only UT_NAMESIZE long and not NUL terminated. */
224 for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt)
225 buf[cnt] = *name;
226 buf[cnt] = '\0';
227 key.data = buf;
228 key.size = cnt;
229
230 if ((*db->get)(db, &key, &data, 0))
231 return (NULL);
232 memmove(&p, data.data, sizeof p);
233 return (p);
234}
235
236PERSON *
237palloc(void)
238{
239 PERSON *p;
240
241 if ((p = malloc(sizeof(PERSON))) == NULL)
242 err(1, NULL);
243 return(p);
244}
245
246static WHERE *
247walloc(PERSON *pn)
248{
249 WHERE *w;
250
251 if ((w = malloc(sizeof(WHERE))) == NULL)
252 err(1, NULL);
253 if (pn->whead == NULL)
254 pn->whead = pn->wtail = w;
255 else {
256 pn->wtail->next = w;
257 pn->wtail = w;
258 }
259 w->next = NULL;
260 return(w);
261}
262
263char *
264prphone(char *num)
265{
266 char *p;
267 int len;
268 static char pbuf[20];
269
270 /* don't touch anything if the user has their own formatting */
271 for (p = num; *p; ++p)
272 if (!isdigit(*p))
273 return(num);
274 len = p - num;
275 p = pbuf;
276 switch(len) {
277 case 11: /* +0-123-456-7890 */
278 *p++ = '+';
279 *p++ = *num++;
280 *p++ = '-';
281 /* FALLTHROUGH */
282 case 10: /* 012-345-6789 */
283 *p++ = *num++;
284 *p++ = *num++;
285 *p++ = *num++;
286 *p++ = '-';
287 /* FALLTHROUGH */
288 case 7: /* 012-3456 */
289 *p++ = *num++;
290 *p++ = *num++;
291 *p++ = *num++;
292 break;
293 case 5: /* x0-1234 */
294 case 4: /* x1234 */
295 *p++ = 'x';
296 *p++ = *num++;
297 break;
298 default:
299 return(num);
300 }
301 if (len != 4) {
302 *p++ = '-';
303 *p++ = *num++;
304 }
305 *p++ = *num++;
306 *p++ = *num++;
307 *p++ = *num++;
308 *p = '\0';
309 return(pbuf);
310}
311
312static void
313find_idle_and_ttywrite(WHERE *w)
314{
315 struct stat sb;
316 time_t touched;
317 int error;
318
319 (void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty);
320
321 error = stat(tbuf, &sb);
322 if (error < 0 && errno == ENOENT) {
323 /*
324 * The terminal listed is not actually a terminal (i.e.,
325 * ":0"). This is a failure, so we'll skip printing
326 * out the idle time, which is non-ideal but better
327 * than a bogus warning and idle time.
328 */
329 w->idletime = -1;
330 return;
331 } else if (error < 0) {
332 warn("%s", tbuf);
333 w->idletime = -1;
334 return;
335 }
336 touched = sb.st_atime;
337 if (touched < w->loginat) {
338 /* tty untouched since before login */
339 touched = w->loginat;
340 }
341 w->idletime = now < touched ? 0 : now - touched;
342
343#define TALKABLE 0220 /* tty is writable if 220 mode */
344 w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
345}
346
347static void
348userinfo(PERSON *pn, struct passwd *pw)
349{
350 char *p, *t;
351 char *bp, name[1024];
352 struct stat sb;
353
354 pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
355
356 pn->uid = pw->pw_uid;
357 if ((pn->name = strdup(pw->pw_name)) == NULL)
358 err(1, "strdup failed");
359 if ((pn->dir = strdup(pw->pw_dir)) == NULL)
360 err(1, "strdup failed");
361 if ((pn->shell = strdup(pw->pw_shell)) == NULL)
362 err(1, "strdup failed");
363
364 /* why do we skip asterisks!?!? */
365 (void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
366 tbuf[sizeof(tbuf) - 1] = '\0';
367 if (*bp == '*')
368 ++bp;
369
370 /* ampersands get replaced by the login name */
371 if (!(p = strsep(&bp, ",")))
372 return;
373 for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
374 if (*t == '&') {
375 (void)strncpy(t, pw->pw_name,
376 sizeof(name) - (t - name));
377 name[sizeof(name) - 1] = '\0';
378 if (islower(*t))
379 *t = toupper(*t);
380 while (t < &name[sizeof(name) - 1] && *++t)
381 continue;
382 } else {
383 ++t;
384 }
385 }
386 *t = '\0';
387 if ((pn->realname = strdup(name)) == NULL)
388 err(1, "strdup failed");
389 pn->office = ((p = strsep(&bp, ",")) && *p) ?
390 strdup(p) : NULL;
391 pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
392 strdup(p) : NULL;
393 pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
394 strdup(p) : NULL;
395 (void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pw->pw_name);
396 pn->mailrecv = -1; /* -1 == not_valid */
397 if (stat(tbuf, &sb) < 0) {
398 if (errno != ENOENT) {
399 warn("%s", tbuf);
400 return;
401 }
402 } else if (sb.st_size != 0) {
403 pn->mailrecv = sb.st_mtime;
404 pn->mailread = sb.st_atime;
405 }
406}
407
408/*
409 * Is this user hiding from finger?
410 * If ~<user>/.nofinger exists, return 1 (hide), else return 0 (nohide).
411 * Nobody can hide from root.
412 */
413
414int
415hide(struct passwd *pw)
416{
417 struct stat st;
418 char buf[MAXPATHLEN];
419
420 if (invoker_root || !pw->pw_dir)
421 return 0;
422
423 snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, _PATH_NOFINGER);
424
425 if (stat(buf, &st) == 0)
426 return 1;
427
428 return 0;
429}