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getpwent.c revision 1.9.28.1
      1 /*	$NetBSD: getpwent.c,v 1.9.28.1 2008/11/29 20:52:48 bouyer Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1987, 1988, 1989, 1993, 1994, 1995
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Copied from:  lib/libc/gen/getpwent.c
     34  *	NetBSD: getpwent.c,v 1.48 2000/10/03 03:22:26 enami Exp
     35  * and then gutted, leaving only /etc/master.passwd support.
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 
     40 #ifdef __weak_alias
     41 #define endpwent		_endpwent
     42 #define getpwent		_getpwent
     43 #define getpwent_r		_getpwent_r
     44 #define getpwuid		_getpwuid
     45 #define getpwnam		_getpwnam
     46 #define setpwent		_setpwent
     47 #define setpassent		_setpassent
     48 #define getpwuid_r		_getpwuid_r
     49 #define getpwnam_r		_getpwnam_r
     50 
     51 __weak_alias(endpwent,_endpwent)
     52 __weak_alias(getpwent,_getpwent)
     53 __weak_alias(getpwent_r,_getpwent_r)
     54 __weak_alias(getpwuid,_getpwuid)
     55 __weak_alias(getpwnam,_getpwnam)
     56 __weak_alias(setpwent,_setpwent)
     57 __weak_alias(setpassent,_setpassent)
     58 __weak_alias(getpwuid_r,_getpwuid_r)
     59 __weak_alias(getpwnam_r,_getpwnam_r)
     60 #endif
     61 
     62 #include <sys/param.h>
     63 
     64 #include <limits.h>
     65 #include <pwd.h>
     66 #include <stdlib.h>
     67 #include <stdio.h>
     68 #include <string.h>
     69 
     70 static	int		pwstart(void);
     71 static	int		pwscan(int, uid_t, const char *, struct passwd *,
     72     char *, size_t);
     73 static	int		pwmatchline(int, uid_t, const char *, struct passwd *,
     74     char *);
     75 
     76 static	FILE		*_pw_fp;
     77 static	struct passwd	_pw_passwd;	/* password structure */
     78 static	int		_pw_stayopen;	/* keep fd's open */
     79 static	int		_pw_filesdone;
     80 
     81 #define	MAXLINELENGTH	1024
     82 
     83 static	char		pwline[MAXLINELENGTH];
     84 
     85 struct passwd *
     86 getpwent(void)
     87 {
     88 
     89 	if ((!_pw_fp && !pwstart()) ||
     90 	    !pwscan(0, 0, NULL, &_pw_passwd, pwline, sizeof(pwline)))
     91 		return (NULL);
     92 	return (&_pw_passwd);
     93 }
     94 
     95 int
     96 getpwent_r(struct passwd *pwres, char *buf, size_t bufsiz,
     97     struct passwd **pwd)
     98 {
     99 	int rval;
    100 
    101 	if (!_pw_fp && !pwstart())
    102 		return 1;
    103 	rval = !pwscan(0, 0, NULL, pwres, buf, bufsiz);
    104 	if (rval)
    105 		*pwd = NULL;
    106 	else
    107 		*pwd = pwres;
    108 	return rval;
    109 }
    110 
    111 struct passwd *
    112 getpwnam(const char *name)
    113 {
    114 	struct passwd *pwd;
    115 	return getpwnam_r(name, &_pw_passwd, pwline, sizeof(pwline),
    116 	    &pwd) == 0 ? pwd : NULL;
    117 }
    118 
    119 int
    120 getpwnam_r(const char *name, struct passwd *pwres, char *buf, size_t bufsiz,
    121     struct passwd **pwd)
    122 {
    123 	int rval;
    124 
    125 	if (!pwstart())
    126 		return 1;
    127 	rval = !pwscan(1, 0, name, pwres, buf, bufsiz);
    128 	if (!_pw_stayopen)
    129 		endpwent();
    130 	if (rval)
    131 		*pwd = NULL;
    132 	else
    133 		*pwd = pwres;
    134 	return rval;
    135 }
    136 
    137 struct passwd *
    138 getpwuid(uid_t uid)
    139 {
    140 	struct passwd *pwd;
    141 	return getpwuid_r(uid, &_pw_passwd, pwline, sizeof(pwline),
    142 	    &pwd) == 0 ? pwd : NULL;
    143 }
    144 
    145 int
    146 getpwuid_r(uid_t uid, struct passwd *pwres, char *buf, size_t bufsiz,
    147     struct passwd **pwd)
    148 {
    149 	int rval;
    150 
    151 	if (!pwstart())
    152 		return 1;
    153 	rval = !pwscan(1, uid, NULL, pwres, buf, bufsiz);
    154 	if (!_pw_stayopen)
    155 		endpwent();
    156 	if (rval)
    157 		*pwd = NULL;
    158 	else
    159 		*pwd = pwres;
    160 	return rval;
    161 }
    162 
    163 void
    164 setpwent(void)
    165 {
    166 
    167 	(void) setpassent(0);
    168 }
    169 
    170 int
    171 setpassent(int stayopen)
    172 {
    173 
    174 	if (!pwstart())
    175 		return 0;
    176 	_pw_stayopen = stayopen;
    177 	return 1;
    178 }
    179 
    180 void
    181 endpwent(void)
    182 {
    183 
    184 	_pw_filesdone = 0;
    185 	if (_pw_fp) {
    186 		(void)fclose(_pw_fp);
    187 		_pw_fp = NULL;
    188 	}
    189 }
    190 
    191 static int
    192 pwstart(void)
    193 {
    194 
    195 	_pw_filesdone = 0;
    196 	if (_pw_fp) {
    197 		rewind(_pw_fp);
    198 		return 1;
    199 	}
    200 	return (_pw_fp = fopen(_PATH_MASTERPASSWD, "r")) ? 1 : 0;
    201 }
    202 
    203 
    204 static int
    205 pwscan(int search, uid_t uid, const char *name, struct passwd *pwd, char *buf,
    206     size_t bufsiz)
    207 {
    208 
    209 	if (_pw_filesdone)
    210 		return 0;
    211 	for (;;) {
    212 		if (!fgets(buf, bufsiz, _pw_fp)) {
    213 			if (!search)
    214 				_pw_filesdone = 1;
    215 			return 0;
    216 		}
    217 		/* skip lines that are too big */
    218 		if (!strchr(buf, '\n')) {
    219 			int ch;
    220 
    221 			while ((ch = getc(_pw_fp)) != '\n' && ch != EOF)
    222 				;
    223 			continue;
    224 		}
    225 		if (pwmatchline(search, uid, name, pwd, buf))
    226 			return 1;
    227 	}
    228 	/* NOTREACHED */
    229 }
    230 
    231 static int
    232 pwmatchline(int search, uid_t uid, const char *name, struct passwd *pwd,
    233     char *buf)
    234 {
    235 	unsigned long	id;
    236 	char		*cp, *bp, *ep;
    237 
    238 	/* name may be NULL if search is nonzero */
    239 
    240 	bp = buf;
    241 	memset(pwd, 0, sizeof(*pwd));
    242 	pwd->pw_name = strsep(&bp, ":\n");		/* name */
    243 	if (search && name && strcmp(pwd->pw_name, name))
    244 		return 0;
    245 
    246 	pwd->pw_passwd = strsep(&bp, ":\n");		/* passwd */
    247 
    248 	if (!(cp = strsep(&bp, ":\n")))				/* uid */
    249 		return 0;
    250 	id = strtoul(cp, &ep, 10);
    251 	if (id > UID_MAX || *ep != '\0')
    252 		return 0;
    253 	pwd->pw_uid = (uid_t)id;
    254 	if (search && name == NULL && pwd->pw_uid != uid)
    255 		return 0;
    256 
    257 	if (!(cp = strsep(&bp, ":\n")))				/* gid */
    258 		return 0;
    259 	id = strtoul(cp, &ep, 10);
    260 	if (id > GID_MAX || *ep != '\0')
    261 		return 0;
    262 	pwd->pw_gid = (gid_t)id;
    263 
    264 	if (!(pwd->pw_class = strsep(&bp, ":")))		/* class */
    265 		return 0;
    266 	if (!(ep = strsep(&bp, ":")))				/* change */
    267 		return 0;
    268 	if (!(ep = strsep(&bp, ":")))				/* expire */
    269 		return 0;
    270 
    271 	if (!(pwd->pw_gecos = strsep(&bp, ":\n")))		/* gecos */
    272 		return 0;
    273 	if (!(pwd->pw_dir = strsep(&bp, ":\n")))		/* directory */
    274 		return 0;
    275 	if (!(pwd->pw_shell = strsep(&bp, ":\n")))		/* shell */
    276 		return 0;
    277 
    278 	if (strchr(bp, ':') != NULL)
    279 		return 0;
    280 
    281 	return 1;
    282 }
    283