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util.c revision 1.19 
      1 /*	$NetBSD: util.c,v 1.19 2003/01/20 05:30:11 simonb Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1989, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  * Portions Copyright (c) 1983, 1995, 1996 Eric P. Allman
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Berkeley and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  */
     39 
     40 #include <sys/cdefs.h>
     41 #ifndef lint
     42 #if 0
     43 static char sccsid[] = "@(#)util.c	8.3 (Berkeley) 4/28/95";
     44 #else
     45 __RCSID("$NetBSD: util.c,v 1.19 2003/01/20 05:30:11 simonb Exp $");
     46 #endif
     47 #endif /* not lint */
     48 
     49 #include <sys/param.h>
     50 #include <sys/stat.h>
     51 
     52 #include <db.h>
     53 #include <ctype.h>
     54 #include <err.h>
     55 #include <errno.h>
     56 #include <fcntl.h>
     57 #include <paths.h>
     58 #include <pwd.h>
     59 #include <stdio.h>
     60 #include <stdlib.h>
     61 #include <string.h>
     62 #include <unistd.h>
     63 #include <utmp.h>
     64 
     65 #include "utmpentry.h"
     66 
     67 #include "finger.h"
     68 #include "extern.h"
     69 
     70 static void	 find_idle_and_ttywrite __P((WHERE *));
     71 static void	 userinfo __P((PERSON *, struct passwd *));
     72 static WHERE	*walloc __P((PERSON *));
     73 
     74 int
     75 match(pw, user)
     76 	struct passwd *pw;
     77 	char *user;
     78 {
     79 	char *p;
     80 	char *bp, name[1024];
     81 
     82 	if (!strcasecmp(pw->pw_name, user))
     83 		return(1);
     84 
     85 	(void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
     86 
     87 	/* Ampersands get replaced by the login name. */
     88 	if (!(p = strsep(&bp, ",")))
     89 		return(0);
     90 
     91 	expandusername(p, pw->pw_name, name, sizeof(name));
     92 	bp = name;
     93 	while ((p = strsep(&bp, "\t ")))
     94 		if (!strcasecmp(p, user))
     95 			return(1);
     96 	return(0);
     97 }
     98 
     99 /* inspired by usr.sbin/sendmail/util.c::buildfname */
    100 void
    101 expandusername(gecos, login, buf, buflen)
    102 	const char *gecos;
    103 	const char *login;
    104 	char *buf;
    105 	int buflen;
    106 {
    107 	const char *p;
    108 	char *bp;
    109 
    110 	/* why do we skip asterisks!?!? */
    111 	if (*gecos == '*')
    112 		gecos++;
    113 	bp = buf;
    114 
    115 	/* copy gecos, interpolating & to be full name */
    116 	for (p = gecos; *p != '\0'; p++) {
    117 		if (bp >= &buf[buflen - 1]) {
    118 			/* buffer overflow - just use login name */
    119 			snprintf(buf, buflen, "%s", login);
    120 			buf[buflen - 1] = '\0';
    121 			return;
    122 		}
    123 		if (*p == '&') {
    124 			/* interpolate full name */
    125 			snprintf(bp, buflen - (bp - buf), "%s", login);
    126 			*bp = toupper(*bp);
    127 			bp += strlen(bp);
    128 		}
    129 		else
    130 			*bp++ = *p;
    131 	}
    132 	*bp = '\0';
    133 }
    134 
    135 void
    136 enter_lastlog(pn)
    137 	PERSON *pn;
    138 {
    139 	WHERE *w;
    140 	static int opened, fd;
    141 	struct lastlog ll;
    142 	char doit = 0;
    143 
    144 	/* some systems may not maintain lastlog, don't report errors. */
    145 	if (!opened) {
    146 		fd = open(_PATH_LASTLOG, O_RDONLY, 0);
    147 		opened = 1;
    148 	}
    149 	if (fd == -1 ||
    150 	    lseek(fd, (off_t)pn->uid * sizeof(ll), SEEK_SET) !=
    151 	    (long)pn->uid * sizeof(ll) ||
    152 	    read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) {
    153 			/* as if never logged in */
    154 			ll.ll_line[0] = ll.ll_host[0] = '\0';
    155 			ll.ll_time = 0;
    156 		}
    157 	if ((w = pn->whead) == NULL)
    158 		doit = 1;
    159 	else if (ll.ll_time != 0) {
    160 		/* if last login is earlier than some current login */
    161 		for (; !doit && w != NULL; w = w->next)
    162 			if (w->info == LOGGEDIN && w->loginat < ll.ll_time)
    163 				doit = 1;
    164 		/*
    165 		 * and if it's not any of the current logins
    166 		 * can't use time comparison because there may be a small
    167 		 * discrepency since login calls time() twice
    168 		 */
    169 		for (w = pn->whead; doit && w != NULL; w = w->next)
    170 			if (w->info == LOGGEDIN &&
    171 			    strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0)
    172 				doit = 0;
    173 	}
    174 	if (doit) {
    175 		w = walloc(pn);
    176 		w->info = LASTLOG;
    177 		memcpy(w->tty = malloc(UT_LINESIZE + 1),
    178 		    ll.ll_line, UT_LINESIZE);
    179 		w->tty[UT_LINESIZE + 1] = '\0';
    180 		memcpy(w->host = malloc(UT_HOSTSIZE + 1),
    181 		    ll.ll_host, UT_HOSTSIZE);
    182 		w->host[UT_HOSTSIZE + 1] = '\0';
    183 		w->loginat = ll.ll_time;
    184 	}
    185 }
    186 
    187 void
    188 enter_where(ep, pn)
    189 	struct utmpentry *ep;
    190 	PERSON *pn;
    191 {
    192 	WHERE *w = walloc(pn);
    193 
    194 	w->info = LOGGEDIN;
    195 	w->tty = ep->line;
    196 	w->host = ep->host;
    197 	w->loginat = (time_t)ep->tv.tv_sec;
    198 	find_idle_and_ttywrite(w);
    199 }
    200 
    201 PERSON *
    202 enter_person(pw)
    203 	struct passwd *pw;
    204 {
    205 	DBT data, key;
    206 	PERSON *pn;
    207 
    208 	if (db == NULL &&
    209 	    (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
    210 		err(1, NULL);
    211 
    212 	key.data = (char *)pw->pw_name;
    213 	key.size = strlen(pw->pw_name);
    214 
    215 	switch ((*db->get)(db, &key, &data, 0)) {
    216 	case 0:
    217 		memmove(&pn, data.data, sizeof pn);
    218 		return (pn);
    219 	default:
    220 	case -1:
    221 		err(1, "db get");
    222 		/* NOTREACHED */
    223 	case 1:
    224 		++entries;
    225 		pn = palloc();
    226 		userinfo(pn, pw);
    227 		pn->whead = NULL;
    228 
    229 		data.size = sizeof(PERSON *);
    230 		data.data = &pn;
    231 		if ((*db->put)(db, &key, &data, 0))
    232 			err(1, "db put");
    233 		return (pn);
    234 	}
    235 }
    236 
    237 PERSON *
    238 find_person(name)
    239 	char *name;
    240 {
    241 	int cnt;
    242 	DBT data, key;
    243 	PERSON *p;
    244 
    245 	if (!db)
    246 		return(NULL);
    247 
    248 	key.data = name;
    249 	key.size = cnt;
    250 
    251 	if ((*db->get)(db, &key, &data, 0))
    252 		return (NULL);
    253 	memmove(&p, data.data, sizeof p);
    254 	return (p);
    255 }
    256 
    257 PERSON *
    258 palloc()
    259 {
    260 	PERSON *p;
    261 
    262 	if ((p = malloc((u_int) sizeof(PERSON))) == NULL)
    263 		err(1, NULL);
    264 	return(p);
    265 }
    266 
    267 static WHERE *
    268 walloc(pn)
    269 	PERSON *pn;
    270 {
    271 	WHERE *w;
    272 
    273 	if ((w = malloc((u_int) sizeof(WHERE))) == NULL)
    274 		err(1, NULL);
    275 	if (pn->whead == NULL)
    276 		pn->whead = pn->wtail = w;
    277 	else {
    278 		pn->wtail->next = w;
    279 		pn->wtail = w;
    280 	}
    281 	w->next = NULL;
    282 	return(w);
    283 }
    284 
    285 char *
    286 prphone(num)
    287 	char *num;
    288 {
    289 	char *p;
    290 	int len;
    291 	static char pbuf[15];
    292 
    293 	/* don't touch anything if the user has their own formatting */
    294 	for (p = num; *p; ++p)
    295 		if (!isdigit((unsigned char)*p))
    296 			return(num);
    297 	len = p - num;
    298 	p = pbuf;
    299 	switch(len) {
    300 	case 11:			/* +0-123-456-7890 */
    301 		*p++ = '+';
    302 		*p++ = *num++;
    303 		*p++ = '-';
    304 		/* FALLTHROUGH */
    305 	case 10:			/* 012-345-6789 */
    306 		*p++ = *num++;
    307 		*p++ = *num++;
    308 		*p++ = *num++;
    309 		*p++ = '-';
    310 		/* FALLTHROUGH */
    311 	case 7:				/* 012-3456 */
    312 		*p++ = *num++;
    313 		*p++ = *num++;
    314 		*p++ = *num++;
    315 		break;
    316 	case 5:				/* x0-1234 */
    317 	case 4:				/* x1234 */
    318 		*p++ = 'x';
    319 		*p++ = *num++;
    320 		break;
    321 	default:
    322 		return(num);
    323 	}
    324 	if (len != 4) {
    325 		*p++ = '-';
    326 		*p++ = *num++;
    327 	}
    328 	*p++ = *num++;
    329 	*p++ = *num++;
    330 	*p++ = *num++;
    331 	*p = '\0';
    332 	return(pbuf);
    333 }
    334 
    335 static void
    336 find_idle_and_ttywrite(w)
    337 	WHERE *w;
    338 {
    339 	struct stat sb;
    340 
    341 	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_DEV, w->tty);
    342 	if (stat(tbuf, &sb) < 0) {
    343 		warn("%s", tbuf);
    344 		return;
    345 	}
    346 	w->idletime = now < sb.st_atime ? 0 : now - sb.st_atime;
    347 
    348 #define	TALKABLE	0220		/* tty is writable if 220 mode */
    349 	w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
    350 }
    351 
    352 static void
    353 userinfo(pn, pw)
    354 	PERSON *pn;
    355 	struct passwd *pw;
    356 {
    357 	char *p;
    358 	char *bp, name[1024];
    359 	struct stat sb;
    360 
    361 	pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
    362 
    363 	pn->uid = pw->pw_uid;
    364 	pn->name = strdup(pw->pw_name);
    365 	pn->dir = strdup(pw->pw_dir);
    366 	pn->shell = strdup(pw->pw_shell);
    367 
    368 	(void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
    369 	tbuf[sizeof(tbuf) - 1] = '\0';
    370 
    371 	/* ampersands get replaced by the login name */
    372 	if (!(p = strsep(&bp, ",")))
    373 		return;
    374 	expandusername(p, pw->pw_name, name, sizeof(name));
    375 	pn->realname = strdup(name);
    376 	pn->office = ((p = strsep(&bp, ",")) && *p) ?
    377 	    strdup(p) : NULL;
    378 	pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
    379 	    strdup(p) : NULL;
    380 	pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
    381 	    strdup(p) : NULL;
    382 	(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILSPOOL,
    383 	    pw->pw_name);
    384 	pn->mailrecv = -1;		/* -1 == not_valid */
    385 	if (stat(tbuf, &sb) < 0) {
    386 		if (errno != ENOENT) {
    387 			(void)fprintf(stderr,
    388 			    "finger: %s: %s\n", tbuf, strerror(errno));
    389 			return;
    390 		}
    391 	} else if (sb.st_size != 0) {
    392 		pn->mailrecv = sb.st_mtime;
    393 		pn->mailread = sb.st_atime;
    394 	}
    395 }
    396