getpwent.c revision 1.8
1 /* $NetBSD: getpwent.c,v 1.8 2005/03/31 04:14:42 christos 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 getpwuid _getpwuid 44 #define getpwnam _getpwnam 45 #define setpwent _setpwent 46 #define setpassent _setpassent 47 48 __weak_alias(endpwent,_endpwent) 49 __weak_alias(getpwent,_getpwent) 50 __weak_alias(getpwuid,_getpwuid) 51 __weak_alias(getpwnam,_getpwnam) 52 __weak_alias(setpwent,_setpwent) 53 __weak_alias(setpassent,_setpassent) 54 #endif 55 56 #include <sys/param.h> 57 58 #include <limits.h> 59 #include <pwd.h> 60 #include <stdlib.h> 61 #include <stdio.h> 62 #include <string.h> 63 64 static int pwstart(void); 65 static int pwscan(int, uid_t, const char *, struct passwd *, 66 char *, size_t); 67 static int pwmatchline(int, uid_t, const char *, struct passwd *, 68 char *); 69 70 static FILE *_pw_fp; 71 static struct passwd _pw_passwd; /* password structure */ 72 static int _pw_stayopen; /* keep fd's open */ 73 static int _pw_filesdone; 74 75 #define MAXLINELENGTH 1024 76 77 static char pwline[MAXLINELENGTH]; 78 79 struct passwd * 80 getpwent(void) 81 { 82 83 if ((!_pw_fp && !pwstart()) || 84 !pwscan(0, 0, NULL, &_pw_passwd, pwline, sizeof(pwline))) 85 return (NULL); 86 return (&_pw_passwd); 87 } 88 89 struct passwd * 90 getpwnam(const char *name) 91 { 92 struct passwd *pwd; 93 return getpwnam_r(name, &_pw_passwd, pwline, sizeof(pwline), 94 &pwd) == 0 ? pwd : NULL; 95 } 96 97 int 98 getpwnam_r(const char *name, struct passwd *pwres, char *buf, size_t bufsiz, 99 struct passwd **pwd) 100 { 101 int rval; 102 103 if (!pwstart()) 104 return 1; 105 rval = !pwscan(1, 0, name, pwres, buf, bufsiz); 106 if (!_pw_stayopen) 107 endpwent(); 108 if (rval) 109 *pwd = NULL; 110 else 111 *pwd = pwres; 112 return rval; 113 } 114 115 struct passwd * 116 getpwuid(uid_t uid) 117 { 118 struct passwd *pwd; 119 return getpwuid_r(uid, &_pw_passwd, pwline, sizeof(pwline), 120 &pwd) == 0 ? pwd : NULL; 121 } 122 123 int 124 getpwuid_r(uid_t uid, struct passwd *pwres, char *buf, size_t bufsiz, 125 struct passwd **pwd) 126 { 127 int rval; 128 129 if (!pwstart()) 130 return 1; 131 rval = !pwscan(1, uid, NULL, pwres, buf, bufsiz); 132 if (!_pw_stayopen) 133 endpwent(); 134 if (rval) 135 *pwd = NULL; 136 else 137 *pwd = pwres; 138 return rval; 139 } 140 141 void 142 setpwent(void) 143 { 144 145 (void) setpassent(0); 146 } 147 148 int 149 setpassent(int stayopen) 150 { 151 152 if (!pwstart()) 153 return 0; 154 _pw_stayopen = stayopen; 155 return 1; 156 } 157 158 void 159 endpwent(void) 160 { 161 162 _pw_filesdone = 0; 163 if (_pw_fp) { 164 (void)fclose(_pw_fp); 165 _pw_fp = NULL; 166 } 167 } 168 169 static int 170 pwstart(void) 171 { 172 173 _pw_filesdone = 0; 174 if (_pw_fp) { 175 rewind(_pw_fp); 176 return 1; 177 } 178 return (_pw_fp = fopen(_PATH_MASTERPASSWD, "r")) ? 1 : 0; 179 } 180 181 182 static int 183 pwscan(int search, uid_t uid, const char *name, struct passwd *pwd, char *buf, 184 size_t bufsiz) 185 { 186 187 if (_pw_filesdone) 188 return 0; 189 for (;;) { 190 if (!fgets(buf, bufsiz, _pw_fp)) { 191 if (!search) 192 _pw_filesdone = 1; 193 return 0; 194 } 195 /* skip lines that are too big */ 196 if (!strchr(buf, '\n')) { 197 int ch; 198 199 while ((ch = getc(_pw_fp)) != '\n' && ch != EOF) 200 ; 201 continue; 202 } 203 if (pwmatchline(search, uid, name, pwd, buf)) 204 return 1; 205 } 206 /* NOTREACHED */ 207 } 208 209 static int 210 pwmatchline(int search, uid_t uid, const char *name, struct passwd *pwd, 211 char *buf) 212 { 213 unsigned long id; 214 char *cp, *bp, *ep; 215 216 /* name may be NULL if search is nonzero */ 217 218 bp = buf; 219 memset(pwd, 0, sizeof(*pwd)); 220 pwd->pw_name = strsep(&bp, ":\n"); /* name */ 221 if (search && name && strcmp(pwd->pw_name, name)) 222 return 0; 223 224 pwd->pw_passwd = strsep(&bp, ":\n"); /* passwd */ 225 226 if (!(cp = strsep(&bp, ":\n"))) /* uid */ 227 return 0; 228 id = strtoul(cp, &ep, 10); 229 if (id > UID_MAX || *ep != '\0') 230 return 0; 231 pwd->pw_uid = (uid_t)id; 232 if (search && name == NULL && pwd->pw_uid != uid) 233 return 0; 234 235 if (!(cp = strsep(&bp, ":\n"))) /* gid */ 236 return 0; 237 id = strtoul(cp, &ep, 10); 238 if (id > GID_MAX || *ep != '\0') 239 return 0; 240 pwd->pw_gid = (gid_t)id; 241 242 if (!(pwd->pw_class = strsep(&bp, ":"))) /* class */ 243 return 0; 244 if (!(ep = strsep(&bp, ":"))) /* change */ 245 return 0; 246 if (!(ep = strsep(&bp, ":"))) /* expire */ 247 return 0; 248 249 if (!(pwd->pw_gecos = strsep(&bp, ":\n"))) /* gecos */ 250 return 0; 251 if (!(pwd->pw_dir = strsep(&bp, ":\n"))) /* directory */ 252 return 0; 253 if (!(pwd->pw_shell = strsep(&bp, ":\n"))) /* shell */ 254 return 0; 255 256 if (strchr(bp, ':') != NULL) 257 return 0; 258 259 return 1; 260 } 261
Indexes created Fri Sep 26 20:09:58 GMT 2025