getpwent.c revision 1.11
1 /* $NetBSD: getpwent.c,v 1.11 2009/01/16 14:48:04 he 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 61 __weak_alias(__getpwent50,_getpwent) 62 __weak_alias(__getpwent_r50,_getpwent_r) 63 __weak_alias(__getpwuid50,_getpwuid) 64 __weak_alias(__getpwnam50,_getpwnam) 65 __weak_alias(__getpwuid_r50,_getpwuid_r) 66 __weak_alias(__getpwnam_r50,_getpwnam_r) 67 #endif 68 69 #include <sys/param.h> 70 71 #include <limits.h> 72 #include <pwd.h> 73 #include <stdlib.h> 74 #include <stdio.h> 75 #include <string.h> 76 77 static int pwstart(void); 78 static int pwscan(int, uid_t, const char *, struct passwd *, 79 char *, size_t); 80 static int pwmatchline(int, uid_t, const char *, struct passwd *, 81 char *); 82 83 static FILE *_pw_fp; 84 static struct passwd _pw_passwd; /* password structure */ 85 static int _pw_stayopen; /* keep fd's open */ 86 static int _pw_filesdone; 87 88 #define MAXLINELENGTH 1024 89 90 static char pwline[MAXLINELENGTH]; 91 92 struct passwd * 93 getpwent(void) 94 { 95 96 if ((!_pw_fp && !pwstart()) || 97 !pwscan(0, 0, NULL, &_pw_passwd, pwline, sizeof(pwline))) 98 return (NULL); 99 return (&_pw_passwd); 100 } 101 102 int 103 getpwent_r(struct passwd *pwres, char *buf, size_t bufsiz, 104 struct passwd **pwd) 105 { 106 int rval; 107 108 if (!_pw_fp && !pwstart()) 109 return 1; 110 rval = !pwscan(0, 0, NULL, pwres, buf, bufsiz); 111 if (rval) 112 *pwd = NULL; 113 else 114 *pwd = pwres; 115 return rval; 116 } 117 118 struct passwd * 119 getpwnam(const char *name) 120 { 121 struct passwd *pwd; 122 return getpwnam_r(name, &_pw_passwd, pwline, sizeof(pwline), 123 &pwd) == 0 ? pwd : NULL; 124 } 125 126 int 127 getpwnam_r(const char *name, struct passwd *pwres, char *buf, size_t bufsiz, 128 struct passwd **pwd) 129 { 130 int rval; 131 132 if (!pwstart()) 133 return 1; 134 rval = !pwscan(1, 0, name, pwres, buf, bufsiz); 135 if (!_pw_stayopen) 136 endpwent(); 137 if (rval) 138 *pwd = NULL; 139 else 140 *pwd = pwres; 141 return rval; 142 } 143 144 struct passwd * 145 getpwuid(uid_t uid) 146 { 147 struct passwd *pwd; 148 return getpwuid_r(uid, &_pw_passwd, pwline, sizeof(pwline), 149 &pwd) == 0 ? pwd : NULL; 150 } 151 152 int 153 getpwuid_r(uid_t uid, struct passwd *pwres, char *buf, size_t bufsiz, 154 struct passwd **pwd) 155 { 156 int rval; 157 158 if (!pwstart()) 159 return 1; 160 rval = !pwscan(1, uid, NULL, pwres, buf, bufsiz); 161 if (!_pw_stayopen) 162 endpwent(); 163 if (rval) 164 *pwd = NULL; 165 else 166 *pwd = pwres; 167 return rval; 168 } 169 170 void 171 setpwent(void) 172 { 173 174 (void) setpassent(0); 175 } 176 177 int 178 setpassent(int stayopen) 179 { 180 181 if (!pwstart()) 182 return 0; 183 _pw_stayopen = stayopen; 184 return 1; 185 } 186 187 void 188 endpwent(void) 189 { 190 191 _pw_filesdone = 0; 192 if (_pw_fp) { 193 (void)fclose(_pw_fp); 194 _pw_fp = NULL; 195 } 196 } 197 198 static int 199 pwstart(void) 200 { 201 202 _pw_filesdone = 0; 203 if (_pw_fp) { 204 rewind(_pw_fp); 205 return 1; 206 } 207 return (_pw_fp = fopen(_PATH_MASTERPASSWD, "r")) ? 1 : 0; 208 } 209 210 211 static int 212 pwscan(int search, uid_t uid, const char *name, struct passwd *pwd, char *buf, 213 size_t bufsiz) 214 { 215 216 if (_pw_filesdone) 217 return 0; 218 for (;;) { 219 if (!fgets(buf, bufsiz, _pw_fp)) { 220 if (!search) 221 _pw_filesdone = 1; 222 return 0; 223 } 224 /* skip lines that are too big */ 225 if (!strchr(buf, '\n')) { 226 int ch; 227 228 while ((ch = getc(_pw_fp)) != '\n' && ch != EOF) 229 ; 230 continue; 231 } 232 if (pwmatchline(search, uid, name, pwd, buf)) 233 return 1; 234 } 235 /* NOTREACHED */ 236 } 237 238 static int 239 pwmatchline(int search, uid_t uid, const char *name, struct passwd *pwd, 240 char *buf) 241 { 242 unsigned long id; 243 char *cp, *bp, *ep; 244 245 /* name may be NULL if search is nonzero */ 246 247 bp = buf; 248 memset(pwd, 0, sizeof(*pwd)); 249 pwd->pw_name = strsep(&bp, ":\n"); /* name */ 250 if (search && name && strcmp(pwd->pw_name, name)) 251 return 0; 252 253 pwd->pw_passwd = strsep(&bp, ":\n"); /* passwd */ 254 255 if (!(cp = strsep(&bp, ":\n"))) /* uid */ 256 return 0; 257 id = strtoul(cp, &ep, 10); 258 if (id > UID_MAX || *ep != '\0') 259 return 0; 260 pwd->pw_uid = (uid_t)id; 261 if (search && name == NULL && pwd->pw_uid != uid) 262 return 0; 263 264 if (!(cp = strsep(&bp, ":\n"))) /* gid */ 265 return 0; 266 id = strtoul(cp, &ep, 10); 267 if (id > GID_MAX || *ep != '\0') 268 return 0; 269 pwd->pw_gid = (gid_t)id; 270 271 if (!(pwd->pw_class = strsep(&bp, ":"))) /* class */ 272 return 0; 273 if (!(ep = strsep(&bp, ":"))) /* change */ 274 return 0; 275 if (!(ep = strsep(&bp, ":"))) /* expire */ 276 return 0; 277 278 if (!(pwd->pw_gecos = strsep(&bp, ":\n"))) /* gecos */ 279 return 0; 280 if (!(pwd->pw_dir = strsep(&bp, ":\n"))) /* directory */ 281 return 0; 282 if (!(pwd->pw_shell = strsep(&bp, ":\n"))) /* shell */ 283 return 0; 284 285 if (strchr(bp, ':') != NULL) 286 return 0; 287 288 return 1; 289 } 290
Indexes created Mon Sep 29 15:09:53 GMT 2025