util.c revision 1590 
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 "finger.h"
55
56static void	 find_idle_and_ttywrite __P((WHERE *));
57static void	 userinfo __P((PERSON *, struct passwd *));
58static WHERE	*walloc __P((PERSON *));
59
60int
61match(pw, user)
62	struct passwd *pw;
63	char *user;
64{
65	register char *p, *t;
66	char name[1024];
67
68	if (!strcasecmp(pw->pw_name, user))
69		return(1);
70
71	/*
72	 * XXX
73	 * Why do we skip asterisks!?!?
74	 */
75	(void)strcpy(p = tbuf, pw->pw_gecos);
76	if (*p == '*')
77		++p;
78
79	/* Ampersands get replaced by the login name. */
80	if ((p = strtok(p, ",")) == NULL)
81		return(0);
82
83	for (t = name; *t = *p; ++p)
84		if (*t == '&') {
85			(void)strcpy(t, pw->pw_name);
86			while (*++t);
87		}
88		else
89			++t;
90	for (t = name; p = strtok(t, "\t "); t = NULL)
91		if (!strcasecmp(p, user))
92			return(1);
93	return(0);
94}
95
96void
97enter_lastlog(pn)
98	register PERSON *pn;
99{
100	register WHERE *w;
101	static int opened, fd;
102	struct lastlog ll;
103	char doit = 0;
104
105	/* some systems may not maintain lastlog, don't report errors. */
106	if (!opened) {
107		fd = open(_PATH_LASTLOG, O_RDONLY, 0);
108		opened = 1;
109	}
110	if (fd == -1 ||
111	    lseek(fd, (long)pn->uid * sizeof(ll), SEEK_SET) !=
112	    (long)pn->uid * sizeof(ll) ||
113	    read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) {
114			/* as if never logged in */
115			ll.ll_line[0] = ll.ll_host[0] = NULL;
116			ll.ll_time = 0;
117		}
118	if ((w = pn->whead) == NULL)
119		doit = 1;
120	else if (ll.ll_time != 0) {
121		/* if last login is earlier than some current login */
122		for (; !doit && w != NULL; w = w->next)
123			if (w->info == LOGGEDIN && w->loginat < ll.ll_time)
124				doit = 1;
125		/*
126		 * and if it's not any of the current logins
127		 * can't use time comparison because there may be a small
128		 * discrepency since login calls time() twice
129		 */
130		for (w = pn->whead; doit && w != NULL; w = w->next)
131			if (w->info == LOGGEDIN &&
132			    strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0)
133				doit = 0;
134	}
135	if (doit) {
136		w = walloc(pn);
137		w->info = LASTLOG;
138		bcopy(ll.ll_line, w->tty, UT_LINESIZE);
139		w->tty[UT_LINESIZE] = 0;
140		bcopy(ll.ll_host, w->host, UT_HOSTSIZE);
141		w->host[UT_HOSTSIZE] = 0;
142		w->loginat = ll.ll_time;
143	}
144}
145
146void
147enter_where(ut, pn)
148	struct utmp *ut;
149	PERSON *pn;
150{
151	register WHERE *w;
152
153	w = walloc(pn);
154	w->info = LOGGEDIN;
155	bcopy(ut->ut_line, w->tty, UT_LINESIZE);
156	w->tty[UT_LINESIZE] = 0;
157	bcopy(ut->ut_host, w->host, UT_HOSTSIZE);
158	w->host[UT_HOSTSIZE] = 0;
159	w->loginat = (time_t)ut->ut_time;
160	find_idle_and_ttywrite(w);
161}
162
163PERSON *
164enter_person(pw)
165	register struct passwd *pw;
166{
167	DBT data, key;
168	PERSON *pn;
169
170	if (db == NULL &&
171	    (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
172		err("%s", strerror(errno));
173
174	key.data = pw->pw_name;
175	key.size = strlen(pw->pw_name);
176
177	switch((*db->get)(db, &key, &data, 0)) {
178	case 0:
179		return(*(PERSON **)data.data);
180	default:
181	case -1:
182		err("db get: %s", strerror(errno));
183		/* NOTREACHED */
184	case 1:
185		++entries;
186		pn = palloc();
187		userinfo(pn, pw);
188		pn->whead = NULL;
189
190		data.size = sizeof(PERSON *);
191		data.data = &pn;
192		if ((*db->put)(db, &key, &data, 0))
193			err("%s", strerror(errno));
194		return(pn);
195	}
196}
197
198PERSON *
199find_person(name)
200	char *name;
201{
202	register int cnt;
203	DBT data, key;
204	char buf[UT_NAMESIZE + 1];
205
206	if (!db)
207		return(NULL);
208
209	/* Name may be only UT_NAMESIZE long and not NUL terminated. */
210	for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt)
211		buf[cnt] = *name;
212	buf[cnt] = '\0';
213	key.data = buf;
214	key.size = cnt;
215
216	return((*db->get)(db, &key, &data, 0) ? NULL : *(PERSON **)data.data);
217}
218
219PERSON *
220palloc()
221{
222	PERSON *p;
223
224	if ((p = malloc((u_int) sizeof(PERSON))) == NULL)
225		err("%s", strerror(errno));
226	return(p);
227}
228
229static WHERE *
230walloc(pn)
231	register PERSON *pn;
232{
233	register WHERE *w;
234
235	if ((w = malloc((u_int) sizeof(WHERE))) == NULL)
236		err("%s", strerror(errno));
237	if (pn->whead == NULL)
238		pn->whead = pn->wtail = w;
239	else {
240		pn->wtail->next = w;
241		pn->wtail = w;
242	}
243	w->next = NULL;
244	return(w);
245}
246
247char *
248prphone(num)
249	char *num;
250{
251	register char *p;
252	int len;
253	static char pbuf[15];
254
255	/* don't touch anything if the user has their own formatting */
256	for (p = num; *p; ++p)
257		if (!isdigit(*p))
258			return(num);
259	len = p - num;
260	p = pbuf;
261	switch(len) {
262	case 11:			/* +0-123-456-7890 */
263		*p++ = '+';
264		*p++ = *num++;
265		*p++ = '-';
266		/* FALLTHROUGH */
267	case 10:			/* 012-345-6789 */
268		*p++ = *num++;
269		*p++ = *num++;
270		*p++ = *num++;
271		*p++ = '-';
272		/* FALLTHROUGH */
273	case 7:				/* 012-3456 */
274		*p++ = *num++;
275		*p++ = *num++;
276		*p++ = *num++;
277		break;
278	case 5:				/* x0-1234 */
279		*p++ = 'x';
280		*p++ = *num++;
281		break;
282	default:
283		return(num);
284	}
285	*p++ = '-';
286	*p++ = *num++;
287	*p++ = *num++;
288	*p++ = *num++;
289	*p++ = *num++;
290	*p = '\0';
291	return(pbuf);
292}
293
294static void
295find_idle_and_ttywrite(w)
296	register WHERE *w;
297{
298	extern time_t now;
299	struct stat sb;
300
301	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty);
302	if (stat(tbuf, &sb) < 0) {
303		(void)fprintf(stderr,
304		    "finger: %s: %s\n", tbuf, strerror(errno));
305		return;
306	}
307	w->idletime = now < sb.st_atime ? 0 : now - sb.st_atime;
308
309#define	TALKABLE	0220		/* tty is writable if 220 mode */
310	w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
311}
312
313static void
314userinfo(pn, pw)
315	register PERSON *pn;
316	register struct passwd *pw;
317{
318	register char *p, *t;
319	char *bp, name[1024];
320
321	pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
322
323	pn->uid = pw->pw_uid;
324	pn->name = strdup(pw->pw_name);
325	pn->dir = strdup(pw->pw_dir);
326	pn->shell = strdup(pw->pw_shell);
327
328	/* why do we skip asterisks!?!? */
329	(void)strcpy(bp = tbuf, pw->pw_gecos);
330	if (*bp == '*')
331		++bp;
332
333	/* ampersands get replaced by the login name */
334	if (!(p = strsep(&bp, ",")))
335		return;
336	for (t = name; *t = *p; ++p)
337		if (*t == '&') {
338			(void)strcpy(t, pw->pw_name);
339			if (islower(*t))
340				*t = toupper(*t);
341			while (*++t);
342		}
343		else
344			++t;
345	pn->realname = strdup(name);
346	pn->office = ((p = strsep(&bp, ",")) && *p) ?
347	    strdup(p) : NULL;
348	pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
349	    strdup(p) : NULL;
350	pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
351	    strdup(p) : NULL;
352}
353
354#if __STDC__
355#include <stdarg.h>
356#else
357#include <varargs.h>
358#endif
359
360void
361#if __STDC__
362err(const char *fmt, ...)
363#else
364err(fmt, va_alist)
365	char *fmt;
366	va_dcl
367#endif
368{
369	va_list ap;
370#if __STDC__
371	va_start(ap, fmt);
372#else
373	va_start(ap);
374#endif
375	(void)fprintf(stderr, "finger: ");
376	(void)vfprintf(stderr, fmt, ap);
377	va_end(ap);
378	(void)fprintf(stderr, "\n");
379	exit(1);
380	/* NOTREACHED */
381}
382