1 /* $NetBSD: getpwent.c,v 1.12 2011/01/12 23:34:00 joerg 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(setpwent,_setpwent) 53 __weak_alias(setpassent,_setpassent) 54 55 __weak_alias(getpwent,__getpwent50) 56 __weak_alias(getpwent_r,__getpwent_r50) 57 __weak_alias(getpwuid,__getpwuid50) 58 __weak_alias(getpwnam,__getpwnam50) 59 __weak_alias(getpwuid_r,__getpwuid_r50) 60 __weak_alias(getpwnam_r,__getpwnam_r50) 61 #endif 62 63 #include <sys/param.h> 64 65 #include <limits.h> 66 #include <pwd.h> 67 #include <stdlib.h> 68 #include <stdio.h> 69 #include <string.h> 70 71 static int pwstart(void); 72 static int pwscan(int, uid_t, const char *, struct passwd *, 73 char *, size_t); 74 static int pwmatchline(int, uid_t, const char *, struct passwd *, 75 char *); 76 77 static FILE *_pw_fp; 78 static struct passwd _pw_passwd; /* password structure */ 79 static int _pw_stayopen; /* keep fd's open */ 80 static int _pw_filesdone; 81 82 #define MAXLINELENGTH 1024 83 84 static char pwline[MAXLINELENGTH]; 85 86 struct passwd * 87 getpwent(void) 88 { 89 90 if ((!_pw_fp && !pwstart()) || 91 !pwscan(0, 0, NULL, &_pw_passwd, pwline, sizeof(pwline))) 92 return (NULL); 93 return (&_pw_passwd); 94 } 95 96 int 97 getpwent_r(struct passwd *pwres, char *buf, size_t bufsiz, 98 struct passwd **pwd) 99 { 100 int rval; 101 102 if (!_pw_fp && !pwstart()) 103 return 1; 104 rval = !pwscan(0, 0, NULL, pwres, buf, bufsiz); 105 if (rval) 106 *pwd = NULL; 107 else 108 *pwd = pwres; 109 return rval; 110 } 111 112 struct passwd * 113 getpwnam(const char *name) 114 { 115 struct passwd *pwd; 116 return getpwnam_r(name, &_pw_passwd, pwline, sizeof(pwline), 117 &pwd) == 0 ? pwd : NULL; 118 } 119 120 int 121 getpwnam_r(const char *name, struct passwd *pwres, char *buf, size_t bufsiz, 122 struct passwd **pwd) 123 { 124 int rval; 125 126 if (!pwstart()) 127 return 1; 128 rval = !pwscan(1, 0, name, pwres, buf, bufsiz); 129 if (!_pw_stayopen) 130 endpwent(); 131 if (rval) 132 *pwd = NULL; 133 else 134 *pwd = pwres; 135 return rval; 136 } 137 138 struct passwd * 139 getpwuid(uid_t uid) 140 { 141 struct passwd *pwd; 142 return getpwuid_r(uid, &_pw_passwd, pwline, sizeof(pwline), 143 &pwd) == 0 ? pwd : NULL; 144 } 145 146 int 147 getpwuid_r(uid_t uid, struct passwd *pwres, char *buf, size_t bufsiz, 148 struct passwd **pwd) 149 { 150 int rval; 151 152 if (!pwstart()) 153 return 1; 154 rval = !pwscan(1, uid, NULL, pwres, buf, bufsiz); 155 if (!_pw_stayopen) 156 endpwent(); 157 if (rval) 158 *pwd = NULL; 159 else 160 *pwd = pwres; 161 return rval; 162 } 163 164 void 165 setpwent(void) 166 { 167 168 (void) setpassent(0); 169 } 170 171 int 172 setpassent(int stayopen) 173 { 174 175 if (!pwstart()) 176 return 0; 177 _pw_stayopen = stayopen; 178 return 1; 179 } 180 181 void 182 endpwent(void) 183 { 184 185 _pw_filesdone = 0; 186 if (_pw_fp) { 187 (void)fclose(_pw_fp); 188 _pw_fp = NULL; 189 } 190 } 191 192 static int 193 pwstart(void) 194 { 195 196 _pw_filesdone = 0; 197 if (_pw_fp) { 198 rewind(_pw_fp); 199 return 1; 200 } 201 return (_pw_fp = fopen(_PATH_MASTERPASSWD, "r")) ? 1 : 0; 202 } 203 204 205 static int 206 pwscan(int search, uid_t uid, const char *name, struct passwd *pwd, char *buf, 207 size_t bufsiz) 208 { 209 210 if (_pw_filesdone) 211 return 0; 212 for (;;) { 213 if (!fgets(buf, bufsiz, _pw_fp)) { 214 if (!search) 215 _pw_filesdone = 1; 216 return 0; 217 } 218 /* skip lines that are too big */ 219 if (!strchr(buf, '\n')) { 220 int ch; 221 222 while ((ch = getc(_pw_fp)) != '\n' && ch != EOF) 223 ; 224 continue; 225 } 226 if (pwmatchline(search, uid, name, pwd, buf)) 227 return 1; 228 } 229 /* NOTREACHED */ 230 } 231 232 static int 233 pwmatchline(int search, uid_t uid, const char *name, struct passwd *pwd, 234 char *buf) 235 { 236 unsigned long id; 237 char *cp, *bp, *ep; 238 239 /* name may be NULL if search is nonzero */ 240 241 bp = buf; 242 memset(pwd, 0, sizeof(*pwd)); 243 pwd->pw_name = strsep(&bp, ":\n"); /* name */ 244 if (search && name && strcmp(pwd->pw_name, name)) 245 return 0; 246 247 pwd->pw_passwd = strsep(&bp, ":\n"); /* passwd */ 248 249 if (!(cp = strsep(&bp, ":\n"))) /* uid */ 250 return 0; 251 id = strtoul(cp, &ep, 10); 252 if (id > UID_MAX || *ep != '\0') 253 return 0; 254 pwd->pw_uid = (uid_t)id; 255 if (search && name == NULL && pwd->pw_uid != uid) 256 return 0; 257 258 if (!(cp = strsep(&bp, ":\n"))) /* gid */ 259 return 0; 260 id = strtoul(cp, &ep, 10); 261 if (id > GID_MAX || *ep != '\0') 262 return 0; 263 pwd->pw_gid = (gid_t)id; 264 265 if (!(pwd->pw_class = strsep(&bp, ":"))) /* class */ 266 return 0; 267 if (!(ep = strsep(&bp, ":"))) /* change */ 268 return 0; 269 if (!(ep = strsep(&bp, ":"))) /* expire */ 270 return 0; 271 272 if (!(pwd->pw_gecos = strsep(&bp, ":\n"))) /* gecos */ 273 return 0; 274 if (!(pwd->pw_dir = strsep(&bp, ":\n"))) /* directory */ 275 return 0; 276 if (!(pwd->pw_shell = strsep(&bp, ":\n"))) /* shell */ 277 return 0; 278 279 if (strchr(bp, ':') != NULL) 280 return 0; 281 282 return 1; 283 } 284