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#if 0
38#ifndef lint
39static char sccsid[] = "@(#)util.c	8.3 (Berkeley) 4/28/95";
40#endif
41#endif
42
43#include <sys/cdefs.h>
44__FBSDID("$FreeBSD: src/usr.bin/finger/util.c,v 1.22 2005/09/19 10:11:47 dds Exp $");
45
46#include <sys/param.h>
47#include <sys/socket.h>
48#include <sys/stat.h>
49#include <ctype.h>
50#include <db.h>
51#include <err.h>
52#include <errno.h>
53#include <fcntl.h>
54#include <paths.h>
55#include <pwd.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59#include <unistd.h>
60#include <utmpx.h>
61#include "finger.h"
62#include "pathnames.h"
63
64static void	 find_idle_and_ttywrite(WHERE *);
65static void	 userinfo(PERSON *, struct passwd *);
66static WHERE	*walloc(PERSON *);
67
68int
69match(struct passwd *pw, const char *user)
70{
71	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(PERSON *pn)
110{
111	WHERE *w;
112	struct lastlogx l, *ll;
113	char doit = 0;
114
115	if ((ll = getlastlogxbyname(pn->name, &l)) == NULL) {
116		bzero(&l, sizeof(l));
117		ll = &l;
118	}
119	if ((w = pn->whead) == NULL)
120		doit = 1;
121	else if (ll->ll_tv.tv_sec != 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_tv.tv_sec)
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		 * discrepancy 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, _UTX_LINESIZE) == 0)
134				doit = 0;
135	}
136	if (doit) {
137		w = walloc(pn);
138		w->info = LASTLOG;
139		bcopy(ll->ll_line, w->tty, _UTX_LINESIZE);
140		w->tty[_UTX_LINESIZE] = 0;
141		bcopy(ll->ll_host, w->host, _UTX_HOSTSIZE);
142		w->host[_UTX_HOSTSIZE] = 0;
143		w->loginat = ll->ll_tv.tv_sec;
144	}
145}
146
147void
148enter_where(struct utmpx *ut, PERSON *pn)
149{
150	WHERE *w;
151
152	w = walloc(pn);
153	w->info = LOGGEDIN;
154	bcopy(ut->ut_line, w->tty, _UTX_LINESIZE);
155	w->tty[_UTX_LINESIZE] = 0;
156	bcopy(ut->ut_host, w->host, _UTX_HOSTSIZE);
157	w->host[_UTX_HOSTSIZE] = 0;
158	w->loginat = (time_t)ut->ut_tv.tv_sec;
159	find_idle_and_ttywrite(w);
160}
161
162PERSON *
163enter_person(struct passwd *pw)
164{
165	DBT data, key;
166	PERSON *pn;
167
168	if (db == NULL &&
169	    (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
170		err(1, NULL);
171
172	key.data = pw->pw_name;
173	key.size = strlen(pw->pw_name);
174
175	switch ((*db->get)(db, &key, &data, 0)) {
176	case 0:
177		memmove(&pn, data.data, sizeof pn);
178		return (pn);
179	default:
180	case -1:
181		err(1, "db get");
182		/* NOTREACHED */
183	case 1:
184		++entries;
185		pn = palloc();
186		userinfo(pn, pw);
187		pn->whead = NULL;
188
189		data.size = sizeof(PERSON *);
190		data.data = &pn;
191		if ((*db->put)(db, &key, &data, 0))
192			err(1, "db put");
193		return (pn);
194	}
195}
196
197PERSON *
198find_person(const char *name)
199{
200	struct passwd *pw;
201
202	int cnt;
203	DBT data, key;
204	PERSON *p;
205	char buf[_UTX_USERSIZE + 1];
206
207	if (!db)
208		return(NULL);
209
210	if ((pw = getpwnam(name)) && hide(pw))
211		return(NULL);
212
213	/* Name may be only _UTX_USERSIZE long and not NUL terminated. */
214	for (cnt = 0; cnt < _UTX_USERSIZE && *name; ++name, ++cnt)
215		buf[cnt] = *name;
216	buf[cnt] = '\0';
217	key.data = buf;
218	key.size = cnt;
219
220	if ((*db->get)(db, &key, &data, 0))
221		return (NULL);
222	memmove(&p, data.data, sizeof p);
223	return (p);
224}
225
226PERSON *
227palloc(void)
228{
229	PERSON *p;
230
231	if ((p = malloc(sizeof(PERSON))) == NULL)
232		err(1, NULL);
233	return(p);
234}
235
236static WHERE *
237walloc(PERSON *pn)
238{
239	WHERE *w;
240
241	if ((w = malloc(sizeof(WHERE))) == NULL)
242		err(1, NULL);
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(char *num)
255{
256	char *p;
257	int len;
258	static char pbuf[20];
259
260	/* don't touch anything if the user has their own formatting */
261	for (p = num; *p; ++p)
262		if (!isdigit(*p))
263			return(num);
264	len = p - num;
265	p = pbuf;
266	switch(len) {
267	case 11:			/* +0-123-456-7890 */
268		*p++ = '+';
269		*p++ = *num++;
270		*p++ = '-';
271		/* FALLTHROUGH */
272	case 10:			/* 012-345-6789 */
273		*p++ = *num++;
274		*p++ = *num++;
275		*p++ = *num++;
276		*p++ = '-';
277		/* FALLTHROUGH */
278	case 7:				/* 012-3456 */
279		*p++ = *num++;
280		*p++ = *num++;
281		*p++ = *num++;
282		break;
283	case 5:				/* x0-1234 */
284	case 4:				/* x1234 */
285		*p++ = 'x';
286		*p++ = *num++;
287		break;
288	default:
289		return(num);
290	}
291	if (len != 4) {
292	    *p++ = '-';
293	    *p++ = *num++;
294	}
295	*p++ = *num++;
296	*p++ = *num++;
297	*p++ = *num++;
298	*p = '\0';
299	return(pbuf);
300}
301
302static void
303find_idle_and_ttywrite(WHERE *w)
304{
305	struct stat sb;
306	time_t touched;
307	int error;
308
309	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty);
310
311	error = stat(tbuf, &sb);
312	if (error < 0 && errno == ENOENT) {
313		/*
314		 * The terminal listed is not actually a terminal (i.e.,
315		 * ":0").  This is a failure, so we'll skip printing
316		 * out the idle time, which is non-ideal but better
317		 * than a bogus warning and idle time.
318		 */
319		w->idletime = -1;
320		return;
321	} else if (error < 0) {
322		warn("%s", tbuf);
323		w->idletime = -1;
324		return;
325	}
326	touched = sb.st_atime;
327	if (touched < w->loginat) {
328		/* tty untouched since before login */
329		touched = w->loginat;
330	}
331	w->idletime = now < touched ? 0 : now - touched;
332
333#define	TALKABLE	0220		/* tty is writable if 220 mode */
334	w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
335}
336
337static void
338userinfo(PERSON *pn, struct passwd *pw)
339{
340	char *p, *t;
341	char *bp, name[1024];
342	struct stat sb;
343
344	pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
345
346	pn->uid = pw->pw_uid;
347	if ((pn->name = strdup(pw->pw_name)) == NULL)
348		err(1, "strdup failed");
349	if ((pn->dir = strdup(pw->pw_dir)) == NULL)
350		err(1, "strdup failed");
351	if ((pn->shell = strdup(pw->pw_shell)) == NULL)
352		err(1, "strdup failed");
353
354	/* why do we skip asterisks!?!? */
355	(void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
356	tbuf[sizeof(tbuf) - 1] = '\0';
357	if (*bp == '*')
358		++bp;
359
360	/* ampersands get replaced by the login name */
361	if (!(p = strsep(&bp, ",")))
362		return;
363	for (t = name; t < &name[sizeof(name) - 1] && (*t = *p) != '\0'; ++p) {
364		if (*t == '&') {
365			(void)strncpy(t, pw->pw_name,
366			    sizeof(name) - (t - name));
367			name[sizeof(name) - 1] = '\0';
368			if (islower(*t))
369				*t = toupper(*t);
370			while (t < &name[sizeof(name) - 1] && *++t)
371				continue;
372		} else {
373			++t;
374		}
375	}
376	*t = '\0';
377	if ((pn->realname = strdup(name)) == NULL)
378		err(1, "strdup failed");
379	pn->office = ((p = strsep(&bp, ",")) && *p) ?
380	    strdup(p) : NULL;
381	pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
382	    strdup(p) : NULL;
383	pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
384	    strdup(p) : NULL;
385	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pw->pw_name);
386	pn->mailrecv = -1;		/* -1 == not_valid */
387	if (stat(tbuf, &sb) < 0) {
388		if (errno != ENOENT) {
389			warn("%s", tbuf);
390			return;
391		}
392	} else if (sb.st_size != 0) {
393		pn->mailrecv = sb.st_mtime;
394		pn->mailread = sb.st_atime;
395	}
396}
397
398/*
399 * Is this user hiding from finger?
400 * If ~<user>/.nofinger exists, return 1 (hide), else return 0 (nohide).
401 * Nobody can hide from root.
402 */
403
404int
405hide(struct passwd *pw)
406{
407	struct stat st;
408	char buf[MAXPATHLEN];
409
410	if (invoker_root || !pw->pw_dir)
411		return 0;
412
413	snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, _PATH_NOFINGER);
414
415	if (stat(buf, &st) == 0)
416		return 1;
417
418	return 0;
419}
420