util.c revision 71273 
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#ifndef lint
38#if 0
39static char sccsid[] = "@(#)util.c	8.3 (Berkeley) 4/28/95";
40#else
41static const char rcsid[] =
42  "$FreeBSD: head/usr.bin/finger/util.c 71273 2001-01-20 00:26:32Z jedgar $";
43#endif
44#endif /* not lint */
45
46#include <sys/param.h>
47#include <sys/stat.h>
48#include <fcntl.h>
49#include <db.h>
50#include <err.h>
51#include <pwd.h>
52#include <utmp.h>
53#include <errno.h>
54#include <unistd.h>
55#include <stdio.h>
56#include <ctype.h>
57#include <stdlib.h>
58#include <string.h>
59#include <paths.h>
60#include <errno.h>
61#include "finger.h"
62
63static void	 find_idle_and_ttywrite __P((WHERE *));
64static void	 userinfo __P((PERSON *, struct passwd *));
65static WHERE	*walloc __P((PERSON *));
66
67int
68match(pw, user)
69	struct passwd *pw;
70	char *user;
71{
72	register char *p, *t;
73	char name[1024];
74
75	if (!strcasecmp(pw->pw_name, user))
76		return(1);
77
78	/*
79	 * XXX
80	 * Why do we skip asterisks!?!?
81	 */
82	(void)strncpy(p = tbuf, pw->pw_gecos, sizeof(tbuf));
83	tbuf[sizeof(tbuf) - 1] = '\0';
84	if (*p == '*')
85		++p;
86
87	/* Ampersands get replaced by the login name. */
88	if ((p = strtok(p, ",")) == NULL)
89		return(0);
90
91	for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
92		if (*t == '&') {
93			(void)strncpy(t, pw->pw_name,
94			    sizeof(name) - (t - name));
95			name[sizeof(name) - 1] = '\0';
96			while (t < &name[sizeof(name) - 1] && *++t)
97				continue;
98		} else {
99			++t;
100		}
101	}
102	*t = '\0';
103	for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL)
104		if (!strcasecmp(p, user))
105			return(1);
106	return(0);
107}
108
109void
110enter_lastlog(pn)
111	register PERSON *pn;
112{
113	register WHERE *w;
114	static int opened, fd;
115	struct lastlog ll;
116	char doit = 0;
117
118	/* some systems may not maintain lastlog, don't report errors. */
119	if (!opened) {
120		fd = open(_PATH_LASTLOG, O_RDONLY, 0);
121		opened = 1;
122	}
123	if (fd == -1 ||
124	    lseek(fd, (long)pn->uid * sizeof(ll), SEEK_SET) !=
125	    (long)pn->uid * sizeof(ll) ||
126	    read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) {
127			/* as if never logged in */
128			ll.ll_line[0] = ll.ll_host[0] = '\0';
129			ll.ll_time = 0;
130		}
131	if ((w = pn->whead) == NULL)
132		doit = 1;
133	else if (ll.ll_time != 0) {
134		/* if last login is earlier than some current login */
135		for (; !doit && w != NULL; w = w->next)
136			if (w->info == LOGGEDIN && w->loginat < ll.ll_time)
137				doit = 1;
138		/*
139		 * and if it's not any of the current logins
140		 * can't use time comparison because there may be a small
141		 * discrepency since login calls time() twice
142		 */
143		for (w = pn->whead; doit && w != NULL; w = w->next)
144			if (w->info == LOGGEDIN &&
145			    strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0)
146				doit = 0;
147	}
148	if (doit) {
149		w = walloc(pn);
150		w->info = LASTLOG;
151		bcopy(ll.ll_line, w->tty, UT_LINESIZE);
152		w->tty[UT_LINESIZE] = 0;
153		bcopy(ll.ll_host, w->host, UT_HOSTSIZE);
154		w->host[UT_HOSTSIZE] = 0;
155		w->loginat = ll.ll_time;
156	}
157}
158
159void
160enter_where(ut, pn)
161	struct utmp *ut;
162	PERSON *pn;
163{
164	register WHERE *w;
165
166	w = walloc(pn);
167	w->info = LOGGEDIN;
168	bcopy(ut->ut_line, w->tty, UT_LINESIZE);
169	w->tty[UT_LINESIZE] = 0;
170	bcopy(ut->ut_host, w->host, UT_HOSTSIZE);
171	w->host[UT_HOSTSIZE] = 0;
172	w->loginat = (time_t)ut->ut_time;
173	find_idle_and_ttywrite(w);
174}
175
176PERSON *
177enter_person(pw)
178	register struct passwd *pw;
179{
180	DBT data, key;
181	PERSON *pn;
182
183	if (db == NULL &&
184	    (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
185		err(1, NULL);
186
187	key.data = pw->pw_name;
188	key.size = strlen(pw->pw_name);
189
190	switch ((*db->get)(db, &key, &data, 0)) {
191	case 0:
192		memmove(&pn, data.data, sizeof pn);
193		return (pn);
194	default:
195	case -1:
196		err(1, "db get");
197		/* NOTREACHED */
198	case 1:
199		++entries;
200		pn = palloc();
201		userinfo(pn, pw);
202		pn->whead = NULL;
203
204		data.size = sizeof(PERSON *);
205		data.data = &pn;
206		if ((*db->put)(db, &key, &data, 0))
207			err(1, "db put");
208		return (pn);
209	}
210}
211
212PERSON *
213find_person(name)
214	char *name;
215{
216	struct passwd *pw;
217
218	register int cnt;
219	DBT data, key;
220	PERSON *p;
221	char buf[UT_NAMESIZE + 1];
222
223	if (!db)
224		return(NULL);
225
226	if ((pw = getpwnam(name)) && hide(pw))
227		return(NULL);
228
229	/* Name may be only UT_NAMESIZE long and not NUL terminated. */
230	for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt)
231		buf[cnt] = *name;
232	buf[cnt] = '\0';
233	key.data = buf;
234	key.size = cnt;
235
236	if ((*db->get)(db, &key, &data, 0))
237		return (NULL);
238	memmove(&p, data.data, sizeof p);
239	return (p);
240}
241
242PERSON *
243palloc()
244{
245	PERSON *p;
246
247	if ((p = malloc((u_int) sizeof(PERSON))) == NULL)
248		err(1, NULL);
249	return(p);
250}
251
252static WHERE *
253walloc(pn)
254	register PERSON *pn;
255{
256	register WHERE *w;
257
258	if ((w = malloc((u_int) sizeof(WHERE))) == NULL)
259		err(1, NULL);
260	if (pn->whead == NULL)
261		pn->whead = pn->wtail = w;
262	else {
263		pn->wtail->next = w;
264		pn->wtail = w;
265	}
266	w->next = NULL;
267	return(w);
268}
269
270char *
271prphone(num)
272	char *num;
273{
274	register char *p;
275	int len;
276	static char pbuf[20];
277
278	/* don't touch anything if the user has their own formatting */
279	for (p = num; *p; ++p)
280		if (!isdigit(*p))
281			return(num);
282	len = p - num;
283	p = pbuf;
284	switch(len) {
285	case 11:			/* +0-123-456-7890 */
286		*p++ = '+';
287		*p++ = *num++;
288		*p++ = '-';
289		/* FALLTHROUGH */
290	case 10:			/* 012-345-6789 */
291		*p++ = *num++;
292		*p++ = *num++;
293		*p++ = *num++;
294		*p++ = '-';
295		/* FALLTHROUGH */
296	case 7:				/* 012-3456 */
297		*p++ = *num++;
298		*p++ = *num++;
299		*p++ = *num++;
300		break;
301	case 5:				/* x0-1234 */
302	case 4:				/* x1234 */
303		*p++ = 'x';
304		*p++ = *num++;
305		break;
306	default:
307		return(num);
308	}
309	if (len != 4) {
310	    *p++ = '-';
311	    *p++ = *num++;
312	}
313	*p++ = *num++;
314	*p++ = *num++;
315	*p++ = *num++;
316	*p = '\0';
317	return(pbuf);
318}
319
320static void
321find_idle_and_ttywrite(w)
322	register WHERE *w;
323{
324	extern time_t now;
325	struct stat sb;
326	time_t touched;
327
328	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty);
329	if (stat(tbuf, &sb) < 0) {
330		warn("%s", tbuf);
331		return;
332	}
333	touched = sb.st_atime;
334	if (touched < w->loginat) {
335		/* tty untouched since before login */
336		touched = w->loginat;
337	}
338	w->idletime = now < touched ? 0 : now - touched;
339
340#define	TALKABLE	0220		/* tty is writable if 220 mode */
341	w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
342}
343
344static void
345userinfo(pn, pw)
346	register PERSON *pn;
347	register struct passwd *pw;
348{
349	register char *p, *t;
350	char *bp, name[1024];
351	struct stat sb;
352
353	pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
354
355	pn->uid = pw->pw_uid;
356	if ((pn->name = strdup(pw->pw_name)) == NULL)
357		err(1, "strdup failed");
358	if ((pn->dir = strdup(pw->pw_dir)) == NULL)
359		err(1, "strdup failed");
360	if ((pn->shell = strdup(pw->pw_shell)) == NULL)
361		err(1, "strdup failed");
362
363	/* why do we skip asterisks!?!? */
364	(void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
365	tbuf[sizeof(tbuf) - 1] = '\0';
366	if (*bp == '*')
367		++bp;
368
369	/* ampersands get replaced by the login name */
370	if (!(p = strsep(&bp, ",")))
371		return;
372	for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
373		if (*t == '&') {
374			(void)strncpy(t, pw->pw_name,
375			    sizeof(name) - (t - name));
376			name[sizeof(name) - 1] = '\0';
377			if (islower(*t))
378				*t = toupper(*t);
379			while (t < &name[sizeof(name) - 1] && *++t)
380				continue;
381		} else {
382			++t;
383		}
384	}
385	*t = '\0';
386	if ((pn->realname = strdup(name)) == NULL)
387		err(1, "strdup failed");
388	pn->office = ((p = strsep(&bp, ",")) && *p) ?
389	    strdup(p) : NULL;
390	pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
391	    strdup(p) : NULL;
392	pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
393	    strdup(p) : NULL;
394	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pw->pw_name);
395	pn->mailrecv = -1;		/* -1 == not_valid */
396	if (stat(tbuf, &sb) < 0) {
397		if (errno != ENOENT) {
398			warn("%s", tbuf);
399			return;
400		}
401	} else if (sb.st_size != 0) {
402		pn->mailrecv = sb.st_mtime;
403		pn->mailread = sb.st_atime;
404	}
405}
406
407/*
408 * Is this user hiding from finger?
409 * If ~<user>/.nofinger exists, return 1 (hide), else return 0 (nohide).
410 */
411
412int
413hide(pw)
414	struct passwd *pw;
415{
416	char buf[MAXPATHLEN+1];
417
418	if (!pw->pw_dir)
419		return 0;
420
421	snprintf(buf, sizeof(buf), "%s/.nofinger", pw->pw_dir);
422	buf[sizeof(buf) - 1] = '\0';
423
424	if (access(buf, F_OK) == 0)
425		return 1;
426
427	return 0;
428}
429