util.c revision 2537 
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	register int cnt;
204	DBT data, key;
205	char buf[UT_NAMESIZE + 1];
206
207	if (!db)
208		return(NULL);
209
210	/* Name may be only UT_NAMESIZE long and not NUL terminated. */
211	for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt)
212		buf[cnt] = *name;
213	buf[cnt] = '\0';
214	key.data = buf;
215	key.size = cnt;
216
217	return((*db->get)(db, &key, &data, 0) ? NULL : *(PERSON **)data.data);
218}
219
220PERSON *
221palloc()
222{
223	PERSON *p;
224
225	if ((p = malloc((u_int) sizeof(PERSON))) == NULL)
226		err("%s", strerror(errno));
227	return(p);
228}
229
230static WHERE *
231walloc(pn)
232	register PERSON *pn;
233{
234	register WHERE *w;
235
236	if ((w = malloc((u_int) sizeof(WHERE))) == NULL)
237		err("%s", strerror(errno));
238	if (pn->whead == NULL)
239		pn->whead = pn->wtail = w;
240	else {
241		pn->wtail->next = w;
242		pn->wtail = w;
243	}
244	w->next = NULL;
245	return(w);
246}
247
248char *
249prphone(num)
250	char *num;
251{
252	register char *p;
253	int len;
254	static char pbuf[15];
255
256	/* don't touch anything if the user has their own formatting */
257	for (p = num; *p; ++p)
258		if (!isdigit(*p))
259			return(num);
260	len = p - num;
261	p = pbuf;
262	switch(len) {
263	case 11:			/* +0-123-456-7890 */
264		*p++ = '+';
265		*p++ = *num++;
266		*p++ = '-';
267		/* FALLTHROUGH */
268	case 10:			/* 012-345-6789 */
269		*p++ = *num++;
270		*p++ = *num++;
271		*p++ = *num++;
272		*p++ = '-';
273		/* FALLTHROUGH */
274	case 7:				/* 012-3456 */
275		*p++ = *num++;
276		*p++ = *num++;
277		*p++ = *num++;
278		break;
279	case 5:				/* x0-1234 */
280	case 4:				/* x1234 */
281		*p++ = 'x';
282		*p++ = *num++;
283		break;
284	default:
285		return(num);
286	}
287	if (len != 4) {
288	    *p++ = '-';
289	    *p++ = *num++;
290	}
291	*p++ = *num++;
292	*p++ = *num++;
293	*p++ = *num++;
294	*p = '\0';
295	return(pbuf);
296}
297
298static void
299find_idle_and_ttywrite(w)
300	register WHERE *w;
301{
302	extern time_t now;
303	struct stat sb;
304
305	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty);
306	if (stat(tbuf, &sb) < 0) {
307		(void)fprintf(stderr,
308		    "finger: %s: %s\n", tbuf, strerror(errno));
309		return;
310	}
311	w->idletime = now < sb.st_atime ? 0 : now - sb.st_atime;
312
313#define	TALKABLE	0220		/* tty is writable if 220 mode */
314	w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
315}
316
317static void
318userinfo(pn, pw)
319	register PERSON *pn;
320	register struct passwd *pw;
321{
322	register char *p, *t;
323	char *bp, name[1024];
324	struct stat sb;
325
326	pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
327
328	pn->uid = pw->pw_uid;
329	pn->name = strdup(pw->pw_name);
330	pn->dir = strdup(pw->pw_dir);
331	pn->shell = strdup(pw->pw_shell);
332
333	/* why do we skip asterisks!?!? */
334	(void)strcpy(bp = tbuf, pw->pw_gecos);
335	if (*bp == '*')
336		++bp;
337
338	/* ampersands get replaced by the login name */
339	if (!(p = strsep(&bp, ",")))
340		return;
341	for (t = name; *t = *p; ++p)
342		if (*t == '&') {
343			(void)strcpy(t, pw->pw_name);
344			if (islower(*t))
345				*t = toupper(*t);
346			while (*++t);
347		}
348		else
349			++t;
350	pn->realname = strdup(name);
351	pn->office = ((p = strsep(&bp, ",")) && *p) ?
352	    strdup(p) : NULL;
353	pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
354	    strdup(p) : NULL;
355	pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
356	    strdup(p) : NULL;
357	(void)sprintf(tbuf,"%s/%s", _PATH_MAILDIR, pw->pw_name);
358	pn->mailrecv = -1;		/* -1 == not_valid */
359	if (stat(tbuf, &sb) < 0) {
360		if (errno != ENOENT) {
361			(void)fprintf(stderr,
362			    "finger: %s: %s\n", tbuf, strerror(errno));
363			return;
364		}
365	} else if (sb.st_size != 0) {
366		pn->mailrecv = sb.st_mtime;
367		pn->mailread = sb.st_atime;
368	}
369}
370
371#if __STDC__
372#include <stdarg.h>
373#else
374#include <varargs.h>
375#endif
376
377void
378#if __STDC__
379err(const char *fmt, ...)
380#else
381err(fmt, va_alist)
382	char *fmt;
383	va_dcl
384#endif
385{
386	va_list ap;
387#if __STDC__
388	va_start(ap, fmt);
389#else
390	va_start(ap);
391#endif
392	(void)fprintf(stderr, "finger: ");
393	(void)vfprintf(stderr, fmt, ap);
394	va_end(ap);
395	(void)fprintf(stderr, "\n");
396	exit(1);
397	/* NOTREACHED */
398}
399