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 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.rtems.org/license/LICENSE. |
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12 | */ |
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13 | |
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14 | #if HAVE_CONFIG_H |
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15 | #include "config.h" |
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16 | #endif |
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17 | |
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18 | #include <stdio.h> |
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19 | #include <sys/types.h> |
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20 | #include <pwd.h> |
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21 | #include <grp.h> |
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22 | #include <errno.h> |
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23 | #include <unistd.h> |
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24 | #include <stdlib.h> |
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25 | #include <string.h> |
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26 | #include <limits.h> |
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27 | #include <ctype.h> |
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28 | |
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29 | #include <rtems/libio_.h> |
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30 | #include <rtems/seterr.h> |
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31 | |
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32 | /** |
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33 | * POSIX 1003.1b - 9.2.2 - User Database Access Routines |
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34 | */ |
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35 | |
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36 | /* |
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37 | * Static, thread-unsafe, buffers |
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38 | */ |
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39 | static FILE *passwd_fp; |
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40 | static char pwbuf[200]; |
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41 | static struct passwd pwent; |
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42 | static FILE *group_fp; |
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43 | static char grbuf[200]; |
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44 | static struct group grent; |
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45 | |
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46 | /* |
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47 | * Prototype to avoid warning |
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48 | */ |
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49 | void init_etc_passwd_group(void); |
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50 | |
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51 | /** |
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52 | * Initialize useable but dummy databases |
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53 | */ |
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54 | void init_etc_passwd_group(void) |
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55 | { |
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56 | FILE *fp; |
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57 | static char etc_passwd_initted = 0; |
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58 | |
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59 | if (etc_passwd_initted) |
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60 | return; |
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61 | etc_passwd_initted = 1; |
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62 | mkdir("/etc", 0777); |
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63 | |
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64 | /* |
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65 | * Initialize /etc/passwd |
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66 | */ |
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67 | if ((fp = fopen("/etc/passwd", "r")) != NULL) { |
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68 | fclose(fp); |
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69 | } |
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70 | else if ((fp = fopen("/etc/passwd", "w")) != NULL) { |
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71 | fprintf(fp, "root:*:0:0:root::/:/bin/sh\n" |
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72 | "rtems:*:1:1:RTEMS Application::/:/bin/sh\n" |
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73 | "tty:!:2:2:tty owner::/:/bin/false\n" ); |
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74 | fclose(fp); |
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75 | } |
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76 | |
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77 | /* |
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78 | * Initialize /etc/group |
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79 | */ |
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80 | if ((fp = fopen("/etc/group", "r")) != NULL) { |
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81 | fclose(fp); |
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82 | } |
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83 | else if ((fp = fopen("/etc/group", "w")) != NULL) { |
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84 | fprintf( fp, "root:x:0:root\n" |
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85 | "rtems:x:1:rtems\n" |
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86 | "tty:x:2:tty\n" ); |
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87 | fclose(fp); |
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88 | } |
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89 | } |
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90 | |
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91 | /** |
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92 | * Extract a string value from the database |
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93 | */ |
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94 | static int |
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95 | scanString(FILE *fp, char **name, char **bufp, size_t *nleft, int nlFlag) |
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96 | { |
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97 | int c; |
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98 | |
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99 | *name = *bufp; |
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100 | for (;;) { |
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101 | c = getc(fp); |
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102 | if (c == ':') { |
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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 == '\n') { |
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108 | if (!nlFlag) |
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109 | return 0; |
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110 | break; |
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111 | } |
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112 | if (c == EOF) |
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113 | return 0; |
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114 | if (*nleft < 2) |
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115 | return 0; |
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116 | **bufp = c; |
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117 | ++(*bufp); |
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118 | --(*nleft); |
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119 | } |
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120 | **bufp = '\0'; |
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121 | ++(*bufp); |
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122 | --(*nleft); |
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123 | return 1; |
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124 | } |
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125 | |
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126 | /** |
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127 | * Extract an integer value from the database |
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128 | */ |
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129 | static int |
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130 | scanInt(FILE *fp, int *val) |
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131 | { |
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132 | int c; |
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133 | unsigned int i = 0; |
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134 | unsigned int limit = INT_MAX; |
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135 | int sign = 0; |
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136 | int d; |
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137 | |
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138 | for (;;) { |
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139 | c = getc(fp); |
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140 | if (c == ':') |
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141 | break; |
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142 | if (sign == 0) { |
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143 | if (c == '-') { |
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144 | sign = -1; |
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145 | limit++; |
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146 | continue; |
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147 | } |
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148 | sign = 1; |
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149 | } |
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150 | if (!isdigit(c)) |
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151 | return 0; |
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152 | d = c - '0'; |
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153 | if ((i > (limit / 10)) |
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154 | || ((i == (limit / 10)) && (d > (limit % 10)))) |
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155 | return 0; |
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156 | i = i * 10 + d; |
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157 | } |
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158 | if (sign == 0) |
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159 | return 0; |
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160 | *val = i * sign; |
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161 | return 1; |
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162 | } |
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163 | |
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164 | /* |
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165 | * Extract a single password record from the database |
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166 | */ |
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167 | static int scanpw( |
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168 | FILE *fp, |
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169 | struct passwd *pwd, |
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170 | char *buffer, |
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171 | size_t bufsize |
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172 | ) |
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173 | { |
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174 | int pwuid, pwgid; |
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175 | |
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176 | if (!scanString(fp, &pwd->pw_name, &buffer, &bufsize, 0) |
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177 | || !scanString(fp, &pwd->pw_passwd, &buffer, &bufsize, 0) |
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178 | || !scanInt(fp, &pwuid) |
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179 | || !scanInt(fp, &pwgid) |
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180 | || !scanString(fp, &pwd->pw_comment, &buffer, &bufsize, 0) |
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181 | || !scanString(fp, &pwd->pw_gecos, &buffer, &bufsize, 0) |
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182 | || !scanString(fp, &pwd->pw_dir, &buffer, &bufsize, 0) |
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183 | || !scanString(fp, &pwd->pw_shell, &buffer, &bufsize, 1)) |
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184 | return 0; |
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185 | pwd->pw_uid = pwuid; |
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186 | pwd->pw_gid = pwgid; |
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187 | return 1; |
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188 | } |
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189 | |
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190 | static int getpw_r( |
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191 | const char *name, |
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192 | int uid, |
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193 | struct passwd *pwd, |
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194 | char *buffer, |
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195 | size_t bufsize, |
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196 | struct passwd **result |
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197 | ) |
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198 | { |
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199 | FILE *fp; |
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200 | int match; |
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201 | |
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202 | init_etc_passwd_group(); |
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203 | |
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204 | if ((fp = fopen("/etc/passwd", "r")) == NULL) |
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205 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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206 | |
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207 | for(;;) { |
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208 | if (!scanpw(fp, pwd, buffer, bufsize)) |
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209 | goto error_einval; |
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210 | |
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211 | if (name) { |
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212 | match = (strcmp(pwd->pw_name, name) == 0); |
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213 | } else { |
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214 | match = (pwd->pw_uid == uid); |
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215 | } |
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216 | |
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217 | if (match) { |
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218 | fclose(fp); |
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219 | *result = pwd; |
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220 | return 0; |
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221 | } |
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222 | } |
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223 | error_einval: |
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224 | fclose(fp); |
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225 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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226 | } |
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227 | |
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228 | int getpwnam_r( |
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229 | const char *name, |
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230 | struct passwd *pwd, |
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231 | char *buffer, |
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232 | size_t bufsize, |
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233 | struct passwd **result |
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234 | ) |
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235 | { |
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236 | return getpw_r(name, 0, pwd, buffer, bufsize, result); |
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237 | } |
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238 | |
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239 | struct passwd *getpwnam( |
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240 | const char *name |
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241 | ) |
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242 | { |
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243 | struct passwd *p; |
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244 | |
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245 | if(getpwnam_r(name, &pwent, pwbuf, sizeof pwbuf, &p)) |
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246 | return NULL; |
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247 | return p; |
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248 | } |
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249 | |
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250 | int getpwuid_r( |
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251 | uid_t uid, |
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252 | struct passwd *pwd, |
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253 | char *buffer, |
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254 | size_t bufsize, |
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255 | struct passwd **result |
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256 | ) |
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257 | { |
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258 | return getpw_r(NULL, uid, pwd, buffer, bufsize, result); |
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259 | } |
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260 | |
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261 | struct passwd *getpwuid( |
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262 | uid_t uid |
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263 | ) |
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264 | { |
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265 | struct passwd *p; |
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266 | |
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267 | if(getpwuid_r(uid, &pwent, pwbuf, sizeof pwbuf, &p)) |
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268 | return NULL; |
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269 | return p; |
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270 | } |
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271 | |
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272 | struct passwd *getpwent(void) |
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273 | { |
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274 | if (passwd_fp == NULL) |
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275 | return NULL; |
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276 | if (!scanpw(passwd_fp, &pwent, pwbuf, sizeof pwbuf)) |
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277 | return NULL; |
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278 | return &pwent; |
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279 | } |
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280 | |
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281 | void setpwent(void) |
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282 | { |
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283 | init_etc_passwd_group(); |
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284 | |
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285 | if (passwd_fp != NULL) |
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286 | fclose(passwd_fp); |
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287 | passwd_fp = fopen("/etc/passwd", "r"); |
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288 | } |
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289 | |
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290 | void endpwent(void) |
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291 | { |
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292 | if (passwd_fp != NULL) |
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293 | fclose(passwd_fp); |
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294 | } |
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295 | |
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296 | /** |
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297 | * Extract a single group record from the database |
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298 | */ |
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299 | static int scangr( |
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300 | FILE *fp, |
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301 | struct group *grp, |
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302 | char *buffer, |
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303 | size_t bufsize |
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304 | ) |
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305 | { |
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306 | int grgid; |
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307 | char *grmem, *cp; |
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308 | int memcount; |
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309 | |
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310 | if (!scanString(fp, &grp->gr_name, &buffer, &bufsize, 0) |
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311 | || !scanString(fp, &grp->gr_passwd, &buffer, &bufsize, 0) |
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312 | || !scanInt(fp, &grgid) |
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313 | || !scanString(fp, &grmem, &buffer, &bufsize, 1)) |
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314 | return 0; |
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315 | grp->gr_gid = grgid; |
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316 | |
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317 | /* |
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318 | * Determine number of members |
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319 | */ |
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320 | for (cp = grmem, memcount = 1 ; *cp != 0 ; cp++) { |
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321 | if(*cp == ',') |
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322 | memcount++; |
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323 | } |
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324 | |
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325 | /* |
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326 | * Hack to produce (hopefully) a suitably-aligned array of pointers |
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327 | */ |
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328 | if (bufsize < (((memcount+1)*sizeof(char *)) + 15)) |
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329 | return 0; |
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330 | grp->gr_mem = (char **)(((uintptr_t)buffer + 15) & ~15); |
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331 | |
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332 | /* |
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333 | * Fill in pointer array |
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334 | */ |
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335 | grp->gr_mem[0] = grmem; |
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336 | for (cp = grmem, memcount = 1 ; *cp != 0 ; cp++) { |
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337 | if(*cp == ',') { |
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338 | *cp = '\0'; |
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339 | grp->gr_mem[memcount++] = cp + 1; |
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340 | } |
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341 | } |
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342 | grp->gr_mem[memcount] = NULL; |
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343 | return 1; |
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344 | } |
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345 | |
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346 | static int getgr_r( |
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347 | const char *name, |
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348 | int gid, |
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349 | struct group *grp, |
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350 | char *buffer, |
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351 | size_t bufsize, |
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352 | struct group **result |
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353 | ) |
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354 | { |
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355 | FILE *fp; |
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356 | int match; |
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357 | |
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358 | init_etc_passwd_group(); |
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359 | |
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360 | if ((fp = fopen("/etc/group", "r")) == NULL) |
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361 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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362 | |
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363 | for(;;) { |
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364 | if (!scangr(fp, grp, buffer, bufsize)) |
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365 | goto error_einval; |
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366 | |
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367 | if (name) { |
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368 | match = (strcmp(grp->gr_name, name) == 0); |
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369 | } else { |
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370 | match = (grp->gr_gid == gid); |
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371 | } |
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372 | |
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373 | if (match) { |
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374 | fclose(fp); |
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375 | *result = grp; |
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376 | return 0; |
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377 | } |
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378 | } |
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379 | error_einval: |
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380 | fclose(fp); |
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381 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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382 | } |
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383 | |
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384 | int getgrnam_r( |
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385 | const char *name, |
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386 | struct group *grp, |
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387 | char *buffer, |
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388 | size_t bufsize, |
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389 | struct group **result |
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390 | ) |
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391 | { |
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392 | return getgr_r(name, 0, grp, buffer, bufsize, result); |
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393 | } |
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394 | |
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395 | struct group *getgrnam( |
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396 | const char *name |
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397 | ) |
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398 | { |
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399 | struct group *p; |
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400 | |
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401 | if(getgrnam_r(name, &grent, grbuf, sizeof grbuf, &p)) |
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402 | return NULL; |
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403 | return p; |
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404 | } |
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405 | |
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406 | int getgrgid_r( |
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407 | gid_t gid, |
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408 | struct group *grp, |
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409 | char *buffer, |
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410 | size_t bufsize, |
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411 | struct group **result |
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412 | ) |
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413 | { |
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414 | return getgr_r(NULL, gid, grp, buffer, bufsize, result); |
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415 | } |
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416 | |
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417 | struct group *getgrgid( |
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418 | gid_t gid |
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419 | ) |
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420 | { |
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421 | struct group *p; |
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422 | |
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423 | if(getgrgid_r(gid, &grent, grbuf, sizeof grbuf, &p)) |
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424 | return NULL; |
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425 | return p; |
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426 | } |
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427 | |
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428 | struct group *getgrent(void) |
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429 | { |
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430 | if (group_fp == NULL) |
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431 | return NULL; |
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432 | if (!scangr(group_fp, &grent, grbuf, sizeof grbuf)) |
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433 | return NULL; |
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434 | return &grent; |
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435 | } |
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436 | |
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437 | void setgrent(void) |
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438 | { |
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439 | init_etc_passwd_group(); |
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440 | |
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441 | if (group_fp != NULL) |
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442 | fclose(group_fp); |
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443 | group_fp = fopen("/etc/group", "r"); |
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444 | } |
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445 | |
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446 | void endgrent(void) |
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447 | { |
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448 | if (group_fp != NULL) |
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449 | fclose(group_fp); |
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450 | } |
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