util.c revision 5369 
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
38static char sccsid[] = "@(#)util.c	8.1 (Berkeley) 6/6/93";
39#endif /* not lint */
40
41#include <sys/param.h>
42#include <sys/stat.h>
43#include <fcntl.h>
44#include <db.h>
45#include <pwd.h>
46#include <utmp.h>
47#include <errno.h>
48#include <unistd.h>
49#include <stdio.h>
50#include <ctype.h>
51#include <stdlib.h>
52#include <string.h>
53#include <paths.h>
54#include <errno.h>
55#include "finger.h"
56
57static void	 find_idle_and_ttywrite __P((WHERE *));
58static void	 userinfo __P((PERSON *, struct passwd *));
59static WHERE	*walloc __P((PERSON *));
60
61int
62match(pw, user)
63	struct passwd *pw;
64	char *user;
65{
66	register char *p, *t;
67	char name[1024];
68
69	if (!strcasecmp(pw->pw_name, user))
70		return(1);
71
72	/*
73	 * XXX
74	 * Why do we skip asterisks!?!?
75	 */
76	(void)strcpy(p = tbuf, pw->pw_gecos);
77	if (*p == '*')
78		++p;
79
80	/* Ampersands get replaced by the login name. */
81	if ((p = strtok(p, ",")) == NULL)
82		return(0);
83
84	for (t = name; *t = *p; ++p)
85		if (*t == '&') {
86			(void)strcpy(t, pw->pw_name);
87			while (*++t);
88		}
89		else
90			++t;
91	for (t = name; p = strtok(t, "\t "); t = NULL)
92		if (!strcasecmp(p, user))
93			return(1);
94	return(0);
95}
96
97void
98enter_lastlog(pn)
99	register PERSON *pn;
100{
101	register WHERE *w;
102	static int opened, fd;
103	struct lastlog ll;
104	char doit = 0;
105
106	/* some systems may not maintain lastlog, don't report errors. */
107	if (!opened) {
108		fd = open(_PATH_LASTLOG, O_RDONLY, 0);
109		opened = 1;
110	}
111	if (fd == -1 ||
112	    lseek(fd, (long)pn->uid * sizeof(ll), SEEK_SET) !=
113	    (long)pn->uid * sizeof(ll) ||
114	    read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) {
115			/* as if never logged in */
116			ll.ll_line[0] = ll.ll_host[0] = NULL;
117			ll.ll_time = 0;
118		}
119	if ((w = pn->whead) == NULL)
120		doit = 1;
121	else if (ll.ll_time != 0) {
122		/* if last login is earlier than some current login */
123		for (; !doit && w != NULL; w = w->next)
124			if (w->info == LOGGEDIN && w->loginat < ll.ll_time)
125				doit = 1;
126		/*
127		 * and if it's not any of the current logins
128		 * can't use time comparison because there may be a small
129		 * discrepency since login calls time() twice
130		 */
131		for (w = pn->whead; doit && w != NULL; w = w->next)
132			if (w->info == LOGGEDIN &&
133			    strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0)
134				doit = 0;
135	}
136	if (doit) {
137		w = walloc(pn);
138		w->info = LASTLOG;
139		bcopy(ll.ll_line, w->tty, UT_LINESIZE);
140		w->tty[UT_LINESIZE] = 0;
141		bcopy(ll.ll_host, w->host, UT_HOSTSIZE);
142		w->host[UT_HOSTSIZE] = 0;
143		w->loginat = ll.ll_time;
144	}
145}
146
147void
148enter_where(ut, pn)
149	struct utmp *ut;
150	PERSON *pn;
151{
152	register WHERE *w;
153
154	w = walloc(pn);
155	w->info = LOGGEDIN;
156	bcopy(ut->ut_line, w->tty, UT_LINESIZE);
157	w->tty[UT_LINESIZE] = 0;
158	bcopy(ut->ut_host, w->host, UT_HOSTSIZE);
159	w->host[UT_HOSTSIZE] = 0;
160	w->loginat = (time_t)ut->ut_time;
161	find_idle_and_ttywrite(w);
162}
163
164PERSON *
165enter_person(pw)
166	register struct passwd *pw;
167{
168	DBT data, key;
169	PERSON *pn;
170
171	if (db == NULL &&
172	    (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
173		err("%s", strerror(errno));
174
175	key.data = pw->pw_name;
176	key.size = strlen(pw->pw_name);
177
178	switch((*db->get)(db, &key, &data, 0)) {
179	case 0:
180		return(*(PERSON **)data.data);
181	default:
182	case -1:
183		err("db get: %s", strerror(errno));
184		/* NOTREACHED */
185	case 1:
186		++entries;
187		pn = palloc();
188		userinfo(pn, pw);
189		pn->whead = NULL;
190
191		data.size = sizeof(PERSON *);
192		data.data = &pn;
193		if ((*db->put)(db, &key, &data, 0))
194			err("%s", strerror(errno));
195		return(pn);
196	}
197}
198
199PERSON *
200find_person(name)
201	char *name;
202{
203	struct passwd *pw;
204
205	register int cnt;
206	DBT data, key;
207	char buf[UT_NAMESIZE + 1];
208
209	if (!db)
210		return(NULL);
211
212	if ((pw = getpwnam(name)) && hide(pw))
213		return(NULL);
214
215	/* Name may be only UT_NAMESIZE long and not NUL terminated. */
216	for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt)
217		buf[cnt] = *name;
218	buf[cnt] = '\0';
219	key.data = buf;
220	key.size = cnt;
221
222	return((*db->get)(db, &key, &data, 0) ? NULL : *(PERSON **)data.data);
223}
224
225PERSON *
226palloc()
227{
228	PERSON *p;
229
230	if ((p = malloc((u_int) sizeof(PERSON))) == NULL)
231		err("%s", strerror(errno));
232	return(p);
233}
234
235static WHERE *
236walloc(pn)
237	register PERSON *pn;
238{
239	register WHERE *w;
240
241	if ((w = malloc((u_int) sizeof(WHERE))) == NULL)
242		err("%s", strerror(errno));
243	if (pn->whead == NULL)
244		pn->whead = pn->wtail = w;
245	else {
246		pn->wtail->next = w;
247		pn->wtail = w;
248	}
249	w->next = NULL;
250	return(w);
251}
252
253char *
254prphone(num)
255	char *num;
256{
257	register char *p;
258	int len;
259	static char pbuf[15];
260
261	/* don't touch anything if the user has their own formatting */
262	for (p = num; *p; ++p)
263		if (!isdigit(*p))
264			return(num);
265	len = p - num;
266	p = pbuf;
267	switch(len) {
268	case 11:			/* +0-123-456-7890 */
269		*p++ = '+';
270		*p++ = *num++;
271		*p++ = '-';
272		/* FALLTHROUGH */
273	case 10:			/* 012-345-6789 */
274		*p++ = *num++;
275		*p++ = *num++;
276		*p++ = *num++;
277		*p++ = '-';
278		/* FALLTHROUGH */
279	case 7:				/* 012-3456 */
280		*p++ = *num++;
281		*p++ = *num++;
282		*p++ = *num++;
283		break;
284	case 5:				/* x0-1234 */
285	case 4:				/* x1234 */
286		*p++ = 'x';
287		*p++ = *num++;
288		break;
289	default:
290		return(num);
291	}
292	if (len != 4) {
293	    *p++ = '-';
294	    *p++ = *num++;
295	}
296	*p++ = *num++;
297	*p++ = *num++;
298	*p++ = *num++;
299	*p = '\0';
300	return(pbuf);
301}
302
303static void
304find_idle_and_ttywrite(w)
305	register WHERE *w;
306{
307	extern time_t now;
308	struct stat sb;
309
310	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty);
311	if (stat(tbuf, &sb) < 0) {
312		(void)fprintf(stderr,
313		    "finger: %s: %s\n", tbuf, strerror(errno));
314		return;
315	}
316	w->idletime = now < sb.st_atime ? 0 : now - sb.st_atime;
317
318#define	TALKABLE	0220		/* tty is writable if 220 mode */
319	w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
320}
321
322static void
323userinfo(pn, pw)
324	register PERSON *pn;
325	register struct passwd *pw;
326{
327	register char *p, *t;
328	char *bp, name[1024];
329	struct stat sb;
330
331	pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
332
333	pn->uid = pw->pw_uid;
334	pn->name = strdup(pw->pw_name);
335	pn->dir = strdup(pw->pw_dir);
336	pn->shell = strdup(pw->pw_shell);
337
338	/* why do we skip asterisks!?!? */
339	(void)strcpy(bp = tbuf, pw->pw_gecos);
340	if (*bp == '*')
341		++bp;
342
343	/* ampersands get replaced by the login name */
344	if (!(p = strsep(&bp, ",")))
345		return;
346	for (t = name; *t = *p; ++p)
347		if (*t == '&') {
348			(void)strcpy(t, pw->pw_name);
349			if (islower(*t))
350				*t = toupper(*t);
351			while (*++t);
352		}
353		else
354			++t;
355	pn->realname = strdup(name);
356	pn->office = ((p = strsep(&bp, ",")) && *p) ?
357	    strdup(p) : NULL;
358	pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
359	    strdup(p) : NULL;
360	pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
361	    strdup(p) : NULL;
362	(void)sprintf(tbuf,"%s/%s", _PATH_MAILDIR, pw->pw_name);
363	pn->mailrecv = -1;		/* -1 == not_valid */
364	if (stat(tbuf, &sb) < 0) {
365		if (errno != ENOENT) {
366			(void)fprintf(stderr,
367			    "finger: %s: %s\n", tbuf, strerror(errno));
368			return;
369		}
370	} else if (sb.st_size != 0) {
371		pn->mailrecv = sb.st_mtime;
372		pn->mailread = sb.st_atime;
373	}
374}
375
376#if __STDC__
377#include <stdarg.h>
378#else
379#include <varargs.h>
380#endif
381
382void
383#if __STDC__
384err(const char *fmt, ...)
385#else
386err(fmt, va_alist)
387	char *fmt;
388	va_dcl
389#endif
390{
391	va_list ap;
392#if __STDC__
393	va_start(ap, fmt);
394#else
395	va_start(ap);
396#endif
397	(void)fprintf(stderr, "finger: ");
398	(void)vfprintf(stderr, fmt, ap);
399	va_end(ap);
400	(void)fprintf(stderr, "\n");
401	exit(1);
402	/* NOTREACHED */
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	int fd;
415	char buf[MAXPATHLEN+1];
416
417	if (!pw->pw_dir)
418		return 0;
419
420	sprintf (buf, "%s/.nofinger", pw->pw_dir);
421
422	if (access (buf, F_OK) == 0)
423		return 1;
424
425	return 0;
426}
427