util.c revision 73260 
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#endif
41static const char rcsid[] =
42  "$FreeBSD: head/usr.bin/finger/util.c 73260 2001-03-01 05:52:38Z imp $";
43#endif /* not lint */
44
45#include <sys/param.h>
46#include <sys/stat.h>
47#include <ctype.h>
48#include <db.h>
49#include <err.h>
50#include <errno.h>
51#include <fcntl.h>
52#include <paths.h>
53#include <pwd.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <unistd.h>
58#include <utmp.h>
59#include "finger.h"
60
61static void	 find_idle_and_ttywrite __P((WHERE *));
62static void	 userinfo __P((PERSON *, struct passwd *));
63static WHERE	*walloc __P((PERSON *));
64
65int
66match(pw, user)
67	struct passwd *pw;
68	char *user;
69{
70	register char *p, *t;
71	char name[1024];
72
73	if (!strcasecmp(pw->pw_name, user))
74		return(1);
75
76	/*
77	 * XXX
78	 * Why do we skip asterisks!?!?
79	 */
80	(void)strncpy(p = tbuf, pw->pw_gecos, sizeof(tbuf));
81	tbuf[sizeof(tbuf) - 1] = '\0';
82	if (*p == '*')
83		++p;
84
85	/* Ampersands get replaced by the login name. */
86	if ((p = strtok(p, ",")) == NULL)
87		return(0);
88
89	for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
90		if (*t == '&') {
91			(void)strncpy(t, pw->pw_name,
92			    sizeof(name) - (t - name));
93			name[sizeof(name) - 1] = '\0';
94			while (t < &name[sizeof(name) - 1] && *++t)
95				continue;
96		} else {
97			++t;
98		}
99	}
100	*t = '\0';
101	for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL)
102		if (!strcasecmp(p, user))
103			return(1);
104	return(0);
105}
106
107void
108enter_lastlog(pn)
109	register PERSON *pn;
110{
111	register 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(ut, pn)
159	struct utmp *ut;
160	PERSON *pn;
161{
162	register WHERE *w;
163
164	w = walloc(pn);
165	w->info = LOGGEDIN;
166	bcopy(ut->ut_line, w->tty, UT_LINESIZE);
167	w->tty[UT_LINESIZE] = 0;
168	bcopy(ut->ut_host, w->host, UT_HOSTSIZE);
169	w->host[UT_HOSTSIZE] = 0;
170	w->loginat = (time_t)ut->ut_time;
171	find_idle_and_ttywrite(w);
172}
173
174PERSON *
175enter_person(pw)
176	register struct passwd *pw;
177{
178	DBT data, key;
179	PERSON *pn;
180
181	if (db == NULL &&
182	    (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
183		err(1, NULL);
184
185	key.data = pw->pw_name;
186	key.size = strlen(pw->pw_name);
187
188	switch ((*db->get)(db, &key, &data, 0)) {
189	case 0:
190		memmove(&pn, data.data, sizeof pn);
191		return (pn);
192	default:
193	case -1:
194		err(1, "db get");
195		/* NOTREACHED */
196	case 1:
197		++entries;
198		pn = palloc();
199		userinfo(pn, pw);
200		pn->whead = NULL;
201
202		data.size = sizeof(PERSON *);
203		data.data = &pn;
204		if ((*db->put)(db, &key, &data, 0))
205			err(1, "db put");
206		return (pn);
207	}
208}
209
210PERSON *
211find_person(name)
212	char *name;
213{
214	struct passwd *pw;
215
216	register int cnt;
217	DBT data, key;
218	PERSON *p;
219	char buf[UT_NAMESIZE + 1];
220
221	if (!db)
222		return(NULL);
223
224	if ((pw = getpwnam(name)) && hide(pw))
225		return(NULL);
226
227	/* Name may be only UT_NAMESIZE long and not NUL terminated. */
228	for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt)
229		buf[cnt] = *name;
230	buf[cnt] = '\0';
231	key.data = buf;
232	key.size = cnt;
233
234	if ((*db->get)(db, &key, &data, 0))
235		return (NULL);
236	memmove(&p, data.data, sizeof p);
237	return (p);
238}
239
240PERSON *
241palloc()
242{
243	PERSON *p;
244
245	if ((p = malloc((u_int) sizeof(PERSON))) == NULL)
246		err(1, NULL);
247	return(p);
248}
249
250static WHERE *
251walloc(pn)
252	register PERSON *pn;
253{
254	register WHERE *w;
255
256	if ((w = malloc((u_int) sizeof(WHERE))) == NULL)
257		err(1, NULL);
258	if (pn->whead == NULL)
259		pn->whead = pn->wtail = w;
260	else {
261		pn->wtail->next = w;
262		pn->wtail = w;
263	}
264	w->next = NULL;
265	return(w);
266}
267
268char *
269prphone(num)
270	char *num;
271{
272	register char *p;
273	int len;
274	static char pbuf[20];
275
276	/* don't touch anything if the user has their own formatting */
277	for (p = num; *p; ++p)
278		if (!isdigit(*p))
279			return(num);
280	len = p - num;
281	p = pbuf;
282	switch(len) {
283	case 11:			/* +0-123-456-7890 */
284		*p++ = '+';
285		*p++ = *num++;
286		*p++ = '-';
287		/* FALLTHROUGH */
288	case 10:			/* 012-345-6789 */
289		*p++ = *num++;
290		*p++ = *num++;
291		*p++ = *num++;
292		*p++ = '-';
293		/* FALLTHROUGH */
294	case 7:				/* 012-3456 */
295		*p++ = *num++;
296		*p++ = *num++;
297		*p++ = *num++;
298		break;
299	case 5:				/* x0-1234 */
300	case 4:				/* x1234 */
301		*p++ = 'x';
302		*p++ = *num++;
303		break;
304	default:
305		return(num);
306	}
307	if (len != 4) {
308	    *p++ = '-';
309	    *p++ = *num++;
310	}
311	*p++ = *num++;
312	*p++ = *num++;
313	*p++ = *num++;
314	*p = '\0';
315	return(pbuf);
316}
317
318static void
319find_idle_and_ttywrite(w)
320	register WHERE *w;
321{
322	extern time_t now;
323	struct stat sb;
324	time_t touched;
325
326	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty);
327	if (stat(tbuf, &sb) < 0) {
328		warn("%s", tbuf);
329		return;
330	}
331	touched = sb.st_atime;
332	if (touched < w->loginat) {
333		/* tty untouched since before login */
334		touched = w->loginat;
335	}
336	w->idletime = now < touched ? 0 : now - touched;
337
338#define	TALKABLE	0220		/* tty is writable if 220 mode */
339	w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
340}
341
342static void
343userinfo(pn, pw)
344	register PERSON *pn;
345	register struct passwd *pw;
346{
347	register char *p, *t;
348	char *bp, name[1024];
349	struct stat sb;
350
351	pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
352
353	pn->uid = pw->pw_uid;
354	if ((pn->name = strdup(pw->pw_name)) == NULL)
355		err(1, "strdup failed");
356	if ((pn->dir = strdup(pw->pw_dir)) == NULL)
357		err(1, "strdup failed");
358	if ((pn->shell = strdup(pw->pw_shell)) == NULL)
359		err(1, "strdup failed");
360
361	/* why do we skip asterisks!?!? */
362	(void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
363	tbuf[sizeof(tbuf) - 1] = '\0';
364	if (*bp == '*')
365		++bp;
366
367	/* ampersands get replaced by the login name */
368	if (!(p = strsep(&bp, ",")))
369		return;
370	for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
371		if (*t == '&') {
372			(void)strncpy(t, pw->pw_name,
373			    sizeof(name) - (t - name));
374			name[sizeof(name) - 1] = '\0';
375			if (islower(*t))
376				*t = toupper(*t);
377			while (t < &name[sizeof(name) - 1] && *++t)
378				continue;
379		} else {
380			++t;
381		}
382	}
383	*t = '\0';
384	if ((pn->realname = strdup(name)) == NULL)
385		err(1, "strdup failed");
386	pn->office = ((p = strsep(&bp, ",")) && *p) ?
387	    strdup(p) : NULL;
388	pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
389	    strdup(p) : NULL;
390	pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
391	    strdup(p) : NULL;
392	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pw->pw_name);
393	pn->mailrecv = -1;		/* -1 == not_valid */
394	if (stat(tbuf, &sb) < 0) {
395		if (errno != ENOENT) {
396			warn("%s", tbuf);
397			return;
398		}
399	} else if (sb.st_size != 0) {
400		pn->mailrecv = sb.st_mtime;
401		pn->mailread = sb.st_atime;
402	}
403}
404
405/*
406 * Is this user hiding from finger?
407 * If ~<user>/.nofinger exists, return 1 (hide), else return 0 (nohide).
408 */
409
410int
411hide(pw)
412	struct passwd *pw;
413{
414	char buf[MAXPATHLEN];
415
416	if (!pw->pw_dir)
417		return 0;
418
419	snprintf(buf, sizeof(buf), "%s/.nofinger", pw->pw_dir);
420
421	if (access(buf, F_OK) == 0)
422		return 1;
423
424	return 0;
425}
426