util.c revision 80649 
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 80649 2001-07-30 16:50:47Z yar $";
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#include "pathnames.h"
61
62static void	 find_idle_and_ttywrite __P((WHERE *));
63static void	 userinfo __P((PERSON *, struct passwd *));
64static WHERE	*walloc __P((PERSON *));
65
66int
67match(pw, user)
68	struct passwd *pw;
69	char *user;
70{
71	register 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(pn)
110	register PERSON *pn;
111{
112	register WHERE *w;
113	static int opened, fd;
114	struct lastlog ll;
115	char doit = 0;
116
117	/* some systems may not maintain lastlog, don't report errors. */
118	if (!opened) {
119		fd = open(_PATH_LASTLOG, O_RDONLY, 0);
120		opened = 1;
121	}
122	if (fd == -1 ||
123	    lseek(fd, (long)pn->uid * sizeof(ll), SEEK_SET) !=
124	    (long)pn->uid * sizeof(ll) ||
125	    read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) {
126			/* as if never logged in */
127			ll.ll_line[0] = ll.ll_host[0] = '\0';
128			ll.ll_time = 0;
129		}
130	if ((w = pn->whead) == NULL)
131		doit = 1;
132	else if (ll.ll_time != 0) {
133		/* if last login is earlier than some current login */
134		for (; !doit && w != NULL; w = w->next)
135			if (w->info == LOGGEDIN && w->loginat < ll.ll_time)
136				doit = 1;
137		/*
138		 * and if it's not any of the current logins
139		 * can't use time comparison because there may be a small
140		 * discrepancy since login calls time() twice
141		 */
142		for (w = pn->whead; doit && w != NULL; w = w->next)
143			if (w->info == LOGGEDIN &&
144			    strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0)
145				doit = 0;
146	}
147	if (doit) {
148		w = walloc(pn);
149		w->info = LASTLOG;
150		bcopy(ll.ll_line, w->tty, UT_LINESIZE);
151		w->tty[UT_LINESIZE] = 0;
152		bcopy(ll.ll_host, w->host, UT_HOSTSIZE);
153		w->host[UT_HOSTSIZE] = 0;
154		w->loginat = ll.ll_time;
155	}
156}
157
158void
159enter_where(ut, pn)
160	struct utmp *ut;
161	PERSON *pn;
162{
163	register WHERE *w;
164
165	w = walloc(pn);
166	w->info = LOGGEDIN;
167	bcopy(ut->ut_line, w->tty, UT_LINESIZE);
168	w->tty[UT_LINESIZE] = 0;
169	bcopy(ut->ut_host, w->host, UT_HOSTSIZE);
170	w->host[UT_HOSTSIZE] = 0;
171	w->loginat = (time_t)ut->ut_time;
172	find_idle_and_ttywrite(w);
173}
174
175PERSON *
176enter_person(pw)
177	register struct passwd *pw;
178{
179	DBT data, key;
180	PERSON *pn;
181
182	if (db == NULL &&
183	    (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
184		err(1, NULL);
185
186	key.data = pw->pw_name;
187	key.size = strlen(pw->pw_name);
188
189	switch ((*db->get)(db, &key, &data, 0)) {
190	case 0:
191		memmove(&pn, data.data, sizeof pn);
192		return (pn);
193	default:
194	case -1:
195		err(1, "db get");
196		/* NOTREACHED */
197	case 1:
198		++entries;
199		pn = palloc();
200		userinfo(pn, pw);
201		pn->whead = NULL;
202
203		data.size = sizeof(PERSON *);
204		data.data = &pn;
205		if ((*db->put)(db, &key, &data, 0))
206			err(1, "db put");
207		return (pn);
208	}
209}
210
211PERSON *
212find_person(name)
213	char *name;
214{
215	struct passwd *pw;
216
217	register int cnt;
218	DBT data, key;
219	PERSON *p;
220	char buf[UT_NAMESIZE + 1];
221
222	if (!db)
223		return(NULL);
224
225	if ((pw = getpwnam(name)) && hide(pw))
226		return(NULL);
227
228	/* Name may be only UT_NAMESIZE long and not NUL terminated. */
229	for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt)
230		buf[cnt] = *name;
231	buf[cnt] = '\0';
232	key.data = buf;
233	key.size = cnt;
234
235	if ((*db->get)(db, &key, &data, 0))
236		return (NULL);
237	memmove(&p, data.data, sizeof p);
238	return (p);
239}
240
241PERSON *
242palloc()
243{
244	PERSON *p;
245
246	if ((p = malloc((u_int) sizeof(PERSON))) == NULL)
247		err(1, NULL);
248	return(p);
249}
250
251static WHERE *
252walloc(pn)
253	register PERSON *pn;
254{
255	register WHERE *w;
256
257	if ((w = malloc((u_int) sizeof(WHERE))) == NULL)
258		err(1, NULL);
259	if (pn->whead == NULL)
260		pn->whead = pn->wtail = w;
261	else {
262		pn->wtail->next = w;
263		pn->wtail = w;
264	}
265	w->next = NULL;
266	return(w);
267}
268
269char *
270prphone(num)
271	char *num;
272{
273	register char *p;
274	int len;
275	static char pbuf[20];
276
277	/* don't touch anything if the user has their own formatting */
278	for (p = num; *p; ++p)
279		if (!isdigit(*p))
280			return(num);
281	len = p - num;
282	p = pbuf;
283	switch(len) {
284	case 11:			/* +0-123-456-7890 */
285		*p++ = '+';
286		*p++ = *num++;
287		*p++ = '-';
288		/* FALLTHROUGH */
289	case 10:			/* 012-345-6789 */
290		*p++ = *num++;
291		*p++ = *num++;
292		*p++ = *num++;
293		*p++ = '-';
294		/* FALLTHROUGH */
295	case 7:				/* 012-3456 */
296		*p++ = *num++;
297		*p++ = *num++;
298		*p++ = *num++;
299		break;
300	case 5:				/* x0-1234 */
301	case 4:				/* x1234 */
302		*p++ = 'x';
303		*p++ = *num++;
304		break;
305	default:
306		return(num);
307	}
308	if (len != 4) {
309	    *p++ = '-';
310	    *p++ = *num++;
311	}
312	*p++ = *num++;
313	*p++ = *num++;
314	*p++ = *num++;
315	*p = '\0';
316	return(pbuf);
317}
318
319static void
320find_idle_and_ttywrite(w)
321	register WHERE *w;
322{
323	extern time_t now;
324	struct stat sb;
325	time_t touched;
326
327	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty);
328	if (stat(tbuf, &sb) < 0) {
329		warn("%s", tbuf);
330		return;
331	}
332	touched = sb.st_atime;
333	if (touched < w->loginat) {
334		/* tty untouched since before login */
335		touched = w->loginat;
336	}
337	w->idletime = now < touched ? 0 : now - touched;
338
339#define	TALKABLE	0220		/* tty is writable if 220 mode */
340	w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
341}
342
343static void
344userinfo(pn, pw)
345	register PERSON *pn;
346	register struct passwd *pw;
347{
348	register char *p, *t;
349	char *bp, name[1024];
350	struct stat sb;
351
352	pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
353
354	pn->uid = pw->pw_uid;
355	if ((pn->name = strdup(pw->pw_name)) == NULL)
356		err(1, "strdup failed");
357	if ((pn->dir = strdup(pw->pw_dir)) == NULL)
358		err(1, "strdup failed");
359	if ((pn->shell = strdup(pw->pw_shell)) == NULL)
360		err(1, "strdup failed");
361
362	/* why do we skip asterisks!?!? */
363	(void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
364	tbuf[sizeof(tbuf) - 1] = '\0';
365	if (*bp == '*')
366		++bp;
367
368	/* ampersands get replaced by the login name */
369	if (!(p = strsep(&bp, ",")))
370		return;
371	for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
372		if (*t == '&') {
373			(void)strncpy(t, pw->pw_name,
374			    sizeof(name) - (t - name));
375			name[sizeof(name) - 1] = '\0';
376			if (islower(*t))
377				*t = toupper(*t);
378			while (t < &name[sizeof(name) - 1] && *++t)
379				continue;
380		} else {
381			++t;
382		}
383	}
384	*t = '\0';
385	if ((pn->realname = strdup(name)) == NULL)
386		err(1, "strdup failed");
387	pn->office = ((p = strsep(&bp, ",")) && *p) ?
388	    strdup(p) : NULL;
389	pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
390	    strdup(p) : NULL;
391	pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
392	    strdup(p) : NULL;
393	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pw->pw_name);
394	pn->mailrecv = -1;		/* -1 == not_valid */
395	if (stat(tbuf, &sb) < 0) {
396		if (errno != ENOENT) {
397			warn("%s", tbuf);
398			return;
399		}
400	} else if (sb.st_size != 0) {
401		pn->mailrecv = sb.st_mtime;
402		pn->mailread = sb.st_atime;
403	}
404}
405
406/*
407 * Is this user hiding from finger?
408 * If ~<user>/.nofinger exists, return 1 (hide), else return 0 (nohide).
409 */
410
411int
412hide(pw)
413	struct passwd *pw;
414{
415	char buf[MAXPATHLEN];
416
417	if (!pw->pw_dir)
418		return 0;
419
420	snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, _PATH_NOFINGER);
421
422	if (access(buf, F_OK) == 0)
423		return 1;
424
425	return 0;
426}
427