[b471854b] | 1 | /** |
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| 2 | * @file |
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| 3 | * |
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| 4 | * @brief User Database Access Routines |
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| 5 | * @ingroup libcsupport |
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| 6 | */ |
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| 7 | |
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| 8 | /* |
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| 9 | * Copyright (c) 1999-2009 Ralf Corsepius <corsepiu@faw.uni-ulm.de> |
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| 10 | * Copyright (c) 1999-2013 Joel Sherrill <joel.sherrill@OARcorp.com> |
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| 11 | * Copyright (c) 2000-2001 Fernando Ruiz Casas <fernando.ruiz@ctv.es> |
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| 12 | * Copyright (c) 2002 Eric Norum <eric.norum@usask.ca> |
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| 13 | * Copyright (c) 2003 Till Straumann <strauman@slac.stanford.edu> |
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| 14 | * Copyright (c) 2012 Alex Ivanov <alexivanov97@gmail.com> |
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| 15 | * |
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| 16 | * The license and distribution terms for this file may be |
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| 17 | * found in the file LICENSE in this distribution or at |
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| 18 | * http://www.rtems.org/license/LICENSE. |
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| 19 | */ |
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| 20 | |
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| 21 | #if HAVE_CONFIG_H |
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| 22 | #include "config.h" |
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| 23 | #endif |
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| 24 | |
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| 25 | #include <sys/stat.h> |
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| 26 | #include <pwd.h> |
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| 27 | #include <grp.h> |
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| 28 | #include <errno.h> |
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[e02d5dd9] | 29 | #include <fcntl.h> |
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[b471854b] | 30 | #include <unistd.h> |
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| 31 | #include <stdlib.h> |
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| 32 | #include <string.h> |
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| 33 | #include <limits.h> |
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| 34 | #include <ctype.h> |
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[80055514] | 35 | #include <pthread.h> |
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[b471854b] | 36 | |
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| 37 | #include <rtems/seterr.h> |
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| 38 | |
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| 39 | #include "pwdgrp.h" |
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| 40 | |
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[80055514] | 41 | static pthread_once_t pwdgrp_once = PTHREAD_ONCE_INIT; |
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| 42 | |
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[6935428] | 43 | static void init_file(const char *name, const char *content) |
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| 44 | { |
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[e02d5dd9] | 45 | /* |
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| 46 | * Unlike to standard UNIX systems, these files are only readable and |
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| 47 | * writeable for the root user. This way we avoid the need for an |
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| 48 | * /etc/shadow. In case more UNIX compatibility is desired, this can be |
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| 49 | * added on demand. |
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| 50 | */ |
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| 51 | int fd = open(name, O_CREAT | O_EXCL | O_WRONLY, S_IRUSR | S_IWUSR); |
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[6935428] | 52 | |
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[e02d5dd9] | 53 | if (fd >= 0) { |
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| 54 | write(fd, content, strlen(content)); |
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| 55 | close(fd); |
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[6935428] | 56 | } |
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| 57 | } |
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| 58 | |
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[b471854b] | 59 | /** |
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| 60 | * Initialize useable but dummy databases |
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| 61 | */ |
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[80055514] | 62 | static void pwdgrp_init(void) |
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[b471854b] | 63 | { |
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[3211e8e] | 64 | int rc; |
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| 65 | |
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| 66 | rc = mkdir("/etc", S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
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| 67 | if ( rc != 0 ) |
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| 68 | return; |
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[b471854b] | 69 | |
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| 70 | /* |
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| 71 | * Initialize /etc/passwd |
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| 72 | */ |
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[002f351] | 73 | init_file("/etc/passwd", "root::0:0::::\n"); |
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[b471854b] | 74 | |
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| 75 | /* |
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| 76 | * Initialize /etc/group |
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| 77 | */ |
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[002f351] | 78 | init_file("/etc/group", "root::0:\n"); |
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[b471854b] | 79 | } |
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| 80 | |
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[80055514] | 81 | void _libcsupport_pwdgrp_init(void) |
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| 82 | { |
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| 83 | pthread_once(&pwdgrp_once, pwdgrp_init); |
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| 84 | } |
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| 85 | |
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[b471854b] | 86 | /** |
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| 87 | * Extract a string value from the database |
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| 88 | */ |
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| 89 | static int |
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| 90 | scanString(FILE *fp, char **name, char **bufp, size_t *nleft, int nlFlag) |
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| 91 | { |
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| 92 | int c; |
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| 93 | |
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| 94 | *name = *bufp; |
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| 95 | for (;;) { |
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| 96 | c = getc(fp); |
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| 97 | if (c == ':') { |
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| 98 | if (nlFlag) |
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| 99 | return 0; |
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| 100 | break; |
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| 101 | } |
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| 102 | if (c == '\n') { |
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| 103 | if (!nlFlag) |
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| 104 | return 0; |
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| 105 | break; |
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| 106 | } |
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| 107 | if (c == EOF) |
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| 108 | return 0; |
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| 109 | if (*nleft < 2) |
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| 110 | return 0; |
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| 111 | **bufp = c; |
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| 112 | ++(*bufp); |
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| 113 | --(*nleft); |
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| 114 | } |
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| 115 | **bufp = '\0'; |
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| 116 | ++(*bufp); |
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| 117 | --(*nleft); |
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| 118 | return 1; |
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| 119 | } |
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| 120 | |
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| 121 | /** |
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| 122 | * Extract an integer value from the database |
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| 123 | */ |
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| 124 | static int |
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| 125 | scanInt(FILE *fp, int *val) |
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| 126 | { |
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| 127 | int c; |
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| 128 | unsigned int i = 0; |
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| 129 | unsigned int limit = INT_MAX; |
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| 130 | int sign = 0; |
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| 131 | int d; |
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| 132 | |
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| 133 | for (;;) { |
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| 134 | c = getc(fp); |
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| 135 | if (c == ':') |
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| 136 | break; |
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| 137 | if (sign == 0) { |
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| 138 | if (c == '-') { |
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| 139 | sign = -1; |
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| 140 | limit++; |
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| 141 | continue; |
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| 142 | } |
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| 143 | sign = 1; |
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| 144 | } |
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| 145 | if (!isdigit(c)) |
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| 146 | return 0; |
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| 147 | d = c - '0'; |
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| 148 | if ((i > (limit / 10)) |
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| 149 | || ((i == (limit / 10)) && (d > (limit % 10)))) |
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| 150 | return 0; |
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| 151 | i = i * 10 + d; |
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| 152 | } |
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| 153 | if (sign == 0) |
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| 154 | return 0; |
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| 155 | *val = i * sign; |
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| 156 | return 1; |
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| 157 | } |
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| 158 | |
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| 159 | /* |
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| 160 | * Extract a single password record from the database |
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| 161 | */ |
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| 162 | int _libcsupport_scanpw( |
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| 163 | FILE *fp, |
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| 164 | struct passwd *pwd, |
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| 165 | char *buffer, |
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| 166 | size_t bufsize |
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| 167 | ) |
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| 168 | { |
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| 169 | int pwuid, pwgid; |
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| 170 | |
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| 171 | if (!scanString(fp, &pwd->pw_name, &buffer, &bufsize, 0) |
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| 172 | || !scanString(fp, &pwd->pw_passwd, &buffer, &bufsize, 0) |
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| 173 | || !scanInt(fp, &pwuid) |
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| 174 | || !scanInt(fp, &pwgid) |
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| 175 | || !scanString(fp, &pwd->pw_comment, &buffer, &bufsize, 0) |
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| 176 | || !scanString(fp, &pwd->pw_gecos, &buffer, &bufsize, 0) |
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| 177 | || !scanString(fp, &pwd->pw_dir, &buffer, &bufsize, 0) |
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| 178 | || !scanString(fp, &pwd->pw_shell, &buffer, &bufsize, 1)) |
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| 179 | return 0; |
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| 180 | pwd->pw_uid = pwuid; |
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| 181 | pwd->pw_gid = pwgid; |
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| 182 | return 1; |
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| 183 | } |
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| 184 | |
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| 185 | static int getpw_r( |
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| 186 | const char *name, |
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| 187 | int uid, |
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| 188 | struct passwd *pwd, |
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| 189 | char *buffer, |
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| 190 | size_t bufsize, |
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| 191 | struct passwd **result |
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| 192 | ) |
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| 193 | { |
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| 194 | FILE *fp; |
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| 195 | int match; |
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| 196 | |
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| 197 | _libcsupport_pwdgrp_init(); |
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| 198 | |
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| 199 | if ((fp = fopen("/etc/passwd", "r")) == NULL) |
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| 200 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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| 201 | |
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| 202 | for(;;) { |
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| 203 | if (!_libcsupport_scanpw(fp, pwd, buffer, bufsize)) |
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| 204 | goto error_einval; |
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| 205 | |
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| 206 | if (name) { |
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| 207 | match = (strcmp(pwd->pw_name, name) == 0); |
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| 208 | } else { |
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| 209 | match = (pwd->pw_uid == uid); |
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| 210 | } |
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| 211 | |
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| 212 | if (match) { |
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| 213 | fclose(fp); |
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| 214 | *result = pwd; |
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| 215 | return 0; |
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| 216 | } |
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| 217 | } |
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| 218 | error_einval: |
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| 219 | fclose(fp); |
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| 220 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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| 221 | } |
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| 222 | |
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| 223 | int getpwnam_r( |
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| 224 | const char *name, |
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| 225 | struct passwd *pwd, |
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| 226 | char *buffer, |
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| 227 | size_t bufsize, |
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| 228 | struct passwd **result |
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| 229 | ) |
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| 230 | { |
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| 231 | return getpw_r(name, 0, pwd, buffer, bufsize, result); |
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| 232 | } |
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| 233 | |
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| 234 | int getpwuid_r( |
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| 235 | uid_t uid, |
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| 236 | struct passwd *pwd, |
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| 237 | char *buffer, |
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| 238 | size_t bufsize, |
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| 239 | struct passwd **result |
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| 240 | ) |
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| 241 | { |
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| 242 | return getpw_r(NULL, uid, pwd, buffer, bufsize, result); |
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| 243 | } |
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| 244 | |
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| 245 | /** |
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| 246 | * Extract a single group record from the database |
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| 247 | */ |
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| 248 | int _libcsupport_scangr( |
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| 249 | FILE *fp, |
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| 250 | struct group *grp, |
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| 251 | char *buffer, |
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| 252 | size_t bufsize |
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| 253 | ) |
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| 254 | { |
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| 255 | int grgid; |
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| 256 | char *grmem, *cp; |
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| 257 | int memcount; |
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| 258 | |
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| 259 | if (!scanString(fp, &grp->gr_name, &buffer, &bufsize, 0) |
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| 260 | || !scanString(fp, &grp->gr_passwd, &buffer, &bufsize, 0) |
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| 261 | || !scanInt(fp, &grgid) |
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| 262 | || !scanString(fp, &grmem, &buffer, &bufsize, 1)) |
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| 263 | return 0; |
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| 264 | grp->gr_gid = grgid; |
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| 265 | |
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| 266 | /* |
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| 267 | * Determine number of members |
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| 268 | */ |
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[002f351] | 269 | if (grmem[0] == '\0') { |
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| 270 | memcount = 0; |
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| 271 | } else { |
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| 272 | for (cp = grmem, memcount = 1 ; *cp != 0 ; cp++) { |
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| 273 | if(*cp == ',') |
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| 274 | memcount++; |
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| 275 | } |
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[b471854b] | 276 | } |
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| 277 | |
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| 278 | /* |
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| 279 | * Hack to produce (hopefully) a suitably-aligned array of pointers |
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| 280 | */ |
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| 281 | if (bufsize < (((memcount+1)*sizeof(char *)) + 15)) |
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| 282 | return 0; |
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| 283 | grp->gr_mem = (char **)(((uintptr_t)buffer + 15) & ~15); |
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| 284 | |
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| 285 | /* |
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| 286 | * Fill in pointer array |
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| 287 | */ |
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[002f351] | 288 | if (grmem[0] == '\0') { |
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| 289 | memcount = 0; |
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| 290 | } else { |
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| 291 | grp->gr_mem[0] = grmem; |
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| 292 | for (cp = grmem, memcount = 1 ; *cp != 0 ; cp++) { |
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| 293 | if(*cp == ',') { |
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| 294 | *cp = '\0'; |
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| 295 | grp->gr_mem[memcount++] = cp + 1; |
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| 296 | } |
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[b471854b] | 297 | } |
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| 298 | } |
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[002f351] | 299 | |
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[b471854b] | 300 | grp->gr_mem[memcount] = NULL; |
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| 301 | return 1; |
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| 302 | } |
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| 303 | |
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| 304 | static int getgr_r( |
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| 305 | const char *name, |
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| 306 | int gid, |
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| 307 | struct group *grp, |
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| 308 | char *buffer, |
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| 309 | size_t bufsize, |
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| 310 | struct group **result |
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| 311 | ) |
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| 312 | { |
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| 313 | FILE *fp; |
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| 314 | int match; |
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| 315 | |
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| 316 | _libcsupport_pwdgrp_init(); |
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| 317 | |
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| 318 | if ((fp = fopen("/etc/group", "r")) == NULL) |
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| 319 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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| 320 | |
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| 321 | for(;;) { |
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| 322 | if (!_libcsupport_scangr(fp, grp, buffer, bufsize)) |
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| 323 | goto error_einval; |
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| 324 | |
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| 325 | if (name) { |
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| 326 | match = (strcmp(grp->gr_name, name) == 0); |
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| 327 | } else { |
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| 328 | match = (grp->gr_gid == gid); |
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| 329 | } |
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| 330 | |
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| 331 | if (match) { |
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| 332 | fclose(fp); |
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| 333 | *result = grp; |
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| 334 | return 0; |
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| 335 | } |
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| 336 | } |
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| 337 | error_einval: |
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| 338 | fclose(fp); |
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| 339 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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| 340 | } |
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| 341 | |
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| 342 | int getgrnam_r( |
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| 343 | const char *name, |
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| 344 | struct group *grp, |
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| 345 | char *buffer, |
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| 346 | size_t bufsize, |
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| 347 | struct group **result |
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| 348 | ) |
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| 349 | { |
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| 350 | return getgr_r(name, 0, grp, buffer, bufsize, result); |
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| 351 | } |
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| 352 | |
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| 353 | int getgrgid_r( |
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| 354 | gid_t gid, |
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| 355 | struct group *grp, |
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| 356 | char *buffer, |
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| 357 | size_t bufsize, |
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| 358 | struct group **result |
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| 359 | ) |
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| 360 | { |
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| 361 | return getgr_r(NULL, gid, grp, buffer, bufsize, result); |
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| 362 | } |
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