1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (C) 1996 5 * David L. Nugent. 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 * 16 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 */ 29 30 #ifndef lint 31 static const char rcsid[] = 32 "$FreeBSD$"; 33 #endif /* not lint */ 34 35 #include <pwd.h> 36 #include <grp.h> 37 #include <libutil.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <stdlib.h> 41 #include <err.h> 42 43 #include "pwupd.h" 44 45 static FILE * pwd_fp = NULL; 46 47 void 48 vendpwent(void) 49 { 50 if (pwd_fp != NULL) { 51 fclose(pwd_fp); 52 pwd_fp = NULL; 53 } 54 } 55 56 void 57 vsetpwent(void) 58 { 59 vendpwent(); 60 } 61 62 static struct passwd * 63 vnextpwent(char const *nam, uid_t uid, int doclose) 64 { 65 struct passwd *pw; 66 char *line; 67 size_t linecap; 68 ssize_t linelen; 69 70 pw = NULL; 71 line = NULL; 72 linecap = 0; 73 74 if (pwd_fp != NULL || (pwd_fp = fopen(getpwpath(_MASTERPASSWD), "r")) != NULL) { 75 while ((linelen = getline(&line, &linecap, pwd_fp)) > 0) { 76 /* Skip comments and empty lines */ 77 if (*line == '\n' || *line == '#') 78 continue; 79 /* trim latest \n */ 80 if (line[linelen - 1 ] == '\n') 81 line[linelen - 1] = '\0'; 82 pw = pw_scan(line, PWSCAN_MASTER); 83 if (pw == NULL) 84 errx(EXIT_FAILURE, "Invalid user entry in '%s':" 85 " '%s'", getpwpath(_MASTERPASSWD), line); 86 if (uid != (uid_t)-1) { 87 if (uid == pw->pw_uid) 88 break; 89 } else if (nam != NULL) { 90 if (strcmp(nam, pw->pw_name) == 0) 91 break; 92 } else 93 break; 94 free(pw); 95 pw = NULL; 96 } 97 if (doclose) 98 vendpwent(); 99 } 100 free(line); 101 102 return (pw); 103 } 104 105 struct passwd * 106 vgetpwent(void) 107 { 108 return vnextpwent(NULL, -1, 0); 109 } 110 111 struct passwd * 112 vgetpwuid(uid_t uid) 113 { 114 return vnextpwent(NULL, uid, 1); 115 } 116 117 struct passwd * 118 vgetpwnam(const char * nam) 119 { 120 return vnextpwent(nam, -1, 1); 121 } 122 123 124 static FILE * grp_fp = NULL; 125 126 void 127 vendgrent(void) 128 { 129 if (grp_fp != NULL) { 130 fclose(grp_fp); 131 grp_fp = NULL; 132 } 133 } 134 135 void 136 vsetgrent(void) 137 { 138 vendgrent(); 139 } 140 141 static struct group * 142 vnextgrent(char const *nam, gid_t gid, int doclose) 143 { 144 struct group *gr; 145 char *line; 146 size_t linecap; 147 ssize_t linelen; 148 149 gr = NULL; 150 line = NULL; 151 linecap = 0; 152 153 if (grp_fp != NULL || (grp_fp = fopen(getgrpath(_GROUP), "r")) != NULL) { 154 while ((linelen = getline(&line, &linecap, grp_fp)) > 0) { 155 /* Skip comments and empty lines */ 156 if (*line == '\n' || *line == '#') 157 continue; 158 /* trim latest \n */ 159 if (line[linelen - 1 ] == '\n') 160 line[linelen - 1] = '\0'; 161 gr = gr_scan(line); 162 if (gr == NULL) 163 errx(EXIT_FAILURE, "Invalid group entry in '%s':" 164 " '%s'", getgrpath(_GROUP), line); 165 if (gid != (gid_t)-1) { 166 if (gid == gr->gr_gid) 167 break; 168 } else if (nam != NULL) { 169 if (strcmp(nam, gr->gr_name) == 0) 170 break; 171 } else 172 break; 173 free(gr); 174 gr = NULL; 175 } 176 if (doclose) 177 vendgrent(); 178 } 179 free(line); 180 181 return (gr); 182 } 183 184 struct group * 185 vgetgrent(void) 186 { 187 return vnextgrent(NULL, -1, 0); 188 } 189 190 191 struct group * 192 vgetgrgid(gid_t gid) 193 { 194 return vnextgrent(NULL, gid, 1); 195 } 196 197 struct group * 198 vgetgrnam(const char * nam) 199 { 200 return vnextgrent(nam, -1, 1); 201 } 202 203