1 | /* |
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2 | * POSIX 1003.1b - 9.2.1 - Group Database Access Routines |
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3 | * |
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4 | * The license and distribution terms for this file may be |
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5 | * found in the file LICENSE in this distribution or at |
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6 | * http://www.OARcorp.com/rtems/license.html. |
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7 | * |
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8 | * $Id$ |
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9 | */ |
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10 | |
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11 | #if HAVE_CONFIG_H |
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12 | #include "config.h" |
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13 | #endif |
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14 | |
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15 | #include <stdio.h> |
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16 | #include <sys/types.h> |
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17 | #include <grp.h> |
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18 | #include <errno.h> |
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19 | #include <unistd.h> |
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20 | #include <stdlib.h> |
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21 | #include <string.h> |
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22 | #include <limits.h> |
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23 | |
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24 | static struct group gr_group; /* password structure */ |
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25 | static FILE *group_fp; |
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26 | |
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27 | /* |
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28 | * The size of these buffers is arbitrary and there is no provision |
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29 | * to protect any of them from overflowing. The scanf patterns |
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30 | * need to be changed to prevent overflowing. In addition, |
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31 | * the limits on these needs to be examined. |
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32 | */ |
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33 | |
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34 | static char groupname[8]; |
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35 | static char password[1024]; |
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36 | static char groups[1024]; |
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37 | static char *gr_mem[16] = { } ; |
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38 | |
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39 | extern void init_etc_passwd_group(void); |
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40 | |
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41 | int getgrnam_r( |
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42 | const char *name, |
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43 | struct group *grp, |
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44 | char *buffer, |
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45 | size_t bufsize, |
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46 | struct group **result |
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47 | ) |
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48 | { |
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49 | FILE *fp; |
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50 | |
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51 | init_etc_passwd_group(); |
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52 | |
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53 | if ((fp = fopen ("/etc/group", "r")) == NULL) { |
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54 | errno = EINVAL; |
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55 | return -1; |
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56 | } |
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57 | |
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58 | while (fgets (buffer, bufsize, fp)) { |
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59 | sscanf (buffer, "%[^:]:%[^:]:%d:%s\n", |
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60 | groupname, password, (int *) &grp->gr_gid, |
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61 | groups); |
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62 | grp->gr_name = groupname; |
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63 | grp->gr_passwd = password; |
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64 | grp->gr_mem = gr_mem ; |
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65 | |
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66 | if (!strcmp (groupname, name)) { |
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67 | fclose (fp); |
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68 | *result = grp; |
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69 | return 0; |
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70 | } |
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71 | } |
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72 | fclose (fp); |
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73 | errno = EINVAL; |
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74 | return -1; |
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75 | } |
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76 | |
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77 | struct group *getgrnam( |
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78 | const char *name |
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79 | ) |
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80 | { |
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81 | char buf[1024]; |
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82 | struct group *g; |
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83 | |
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84 | if ( getgrnam_r( name, &gr_group, buf, 1024, &g ) ) |
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85 | return NULL; |
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86 | |
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87 | return g; |
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88 | } |
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89 | |
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90 | int getgrgid_r( |
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91 | gid_t gid, |
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92 | struct group *grp, |
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93 | char *buffer, |
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94 | size_t bufsize, |
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95 | struct group **result |
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96 | ) |
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97 | { |
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98 | FILE *fp; |
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99 | |
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100 | init_etc_passwd_group(); |
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101 | |
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102 | if ((fp = fopen ("/etc/group", "r")) == NULL) { |
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103 | errno = EINVAL; |
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104 | return -1; |
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105 | } |
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106 | |
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107 | while (fgets (buffer, bufsize, fp)) { |
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108 | sscanf (buffer, "%[^:]:%[^:]:%d:%s\n", |
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109 | groupname, password, (int *) &gr_group.gr_gid, |
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110 | groups); |
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111 | gr_group.gr_name = groupname; |
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112 | gr_group.gr_passwd = password; |
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113 | gr_group.gr_mem = gr_mem ; |
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114 | |
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115 | |
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116 | if (gid == gr_group.gr_gid) { |
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117 | fclose (fp); |
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118 | *result = grp; |
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119 | return 0; |
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120 | } |
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121 | } |
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122 | fclose (fp); |
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123 | errno = EINVAL; |
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124 | return -1; |
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125 | } |
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126 | |
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127 | struct group *getgrgid ( |
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128 | gid_t gid |
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129 | ) |
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130 | { |
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131 | char buf[1024]; |
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132 | struct group *g; |
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133 | |
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134 | if ( getgrgid_r( gid, &gr_group, buf, 1024, &g ) ) |
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135 | return NULL; |
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136 | |
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137 | return g; |
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138 | } |
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139 | |
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140 | struct group *getgrent( void ) |
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141 | { |
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142 | char buf[1024]; |
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143 | |
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144 | if (group_fp == NULL) |
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145 | return NULL; |
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146 | |
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147 | if (fgets (buf, sizeof (buf), group_fp) == NULL) |
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148 | return NULL; |
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149 | |
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150 | sscanf (buf, "%[^:]:%[^:]:%d:%s\n", |
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151 | groupname, password, (int *) &gr_group.gr_gid, |
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152 | groups); |
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153 | gr_group.gr_name = groupname; |
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154 | gr_group.gr_passwd = password; |
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155 | gr_group.gr_mem = gr_mem ; |
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156 | |
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157 | return &gr_group; |
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158 | } |
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159 | |
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160 | void |
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161 | setgrent () |
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162 | { |
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163 | init_etc_passwd_group(); |
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164 | |
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165 | if (group_fp != NULL) |
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166 | fclose (group_fp); |
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167 | |
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168 | group_fp = fopen ("/etc/group", "r"); |
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169 | } |
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170 | |
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171 | void |
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172 | endgrent () |
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173 | { |
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174 | if (group_fp != NULL) |
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175 | fclose (group_fp); |
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176 | } |
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