1 | /* |
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2 | * POSIX 1003.1b - 9.2.2 - User 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 <pwd.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 | #include <fcntl.h> |
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24 | #include <unistd.h> |
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25 | |
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26 | static struct passwd pw_passwd; /* password structure */ |
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27 | static FILE *passwd_fp; |
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28 | |
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29 | /* |
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30 | * The size of these buffers is arbitrary and there is no provision |
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31 | * to protect any of them from overflowing. The scanf patterns |
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32 | * need to be changed to prevent overflowing. In addition, |
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33 | * the limits on these needs to be examined. |
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34 | */ |
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35 | |
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36 | static char logname[8]; |
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37 | static char password[1024]; |
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38 | static char comment[1024]; |
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39 | static char gecos[1024]; |
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40 | static char dir[1024]; |
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41 | static char shell[1024]; |
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42 | |
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43 | /* |
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44 | * Initialize a useable but dummy /etc/passwd |
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45 | * |
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46 | * NOTE: Ignore all errors. |
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47 | * |
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48 | */ |
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49 | |
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50 | static char etc_passwd_initted = 0; |
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51 | |
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52 | void init_etc_passwd_group(void) |
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53 | { |
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54 | FILE *fp; |
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55 | |
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56 | if ( etc_passwd_initted ) |
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57 | return; |
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58 | etc_passwd_initted = 1; |
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59 | |
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60 | (void) mkdir( "/etc", S_IRWXU | S_IRWXG | S_IRWXO ); |
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61 | |
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62 | /* |
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63 | * Initialize /etc/passwd |
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64 | */ |
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65 | |
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66 | if ((fp = fopen ("/etc/passwd", "w")) == NULL) |
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67 | return; |
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68 | |
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69 | fprintf( fp, "root:*:0:0:root,,,,:/tmp:/bin/false\n" |
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70 | "rtems:*:1:1:RTEMS Application,,,,:/tmp:/bin/false\n" ); |
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71 | |
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72 | fclose( fp ); |
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73 | |
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74 | /* |
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75 | * Initialize /etc/group |
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76 | */ |
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77 | |
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78 | if ((fp = fopen ("/etc/group", "w")) == NULL) |
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79 | return; |
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80 | |
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81 | fprintf( fp, "root::0:root\n" |
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82 | "rtems::0:rtems\n" ); |
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83 | |
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84 | fclose( fp ); |
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85 | } |
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86 | |
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87 | int getpwnam_r( |
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88 | const char *name, |
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89 | struct passwd *pwd, |
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90 | char *buffer, |
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91 | size_t bufsize, |
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92 | struct passwd **result |
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93 | ) |
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94 | { |
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95 | FILE *fp; |
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96 | |
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97 | init_etc_passwd_group(); |
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98 | |
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99 | if ((fp = fopen ("/etc/passwd", "r")) == NULL) { |
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100 | errno = EINVAL; |
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101 | return -1; |
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102 | } |
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103 | |
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104 | while (fgets (buffer, bufsize, fp)) { |
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105 | sscanf (buffer, "%[^:]:%[^:]:%d:%d:%[^:]:%[^:]:%[^:]:%s\n", |
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106 | logname, password, &pwd->pw_uid, |
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107 | &pwd->pw_gid, comment, gecos, |
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108 | dir, shell); |
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109 | pwd->pw_name = logname; |
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110 | pwd->pw_passwd = password; |
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111 | pwd->pw_comment = comment; |
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112 | pwd->pw_gecos = gecos; |
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113 | pwd->pw_dir = dir; |
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114 | pwd->pw_shell = shell; |
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115 | |
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116 | if (!strcmp (logname, name)) { |
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117 | fclose (fp); |
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118 | *result = pwd; |
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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 passwd *getpwnam( |
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128 | const char *name |
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129 | ) |
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130 | { |
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131 | char buf[1024]; |
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132 | struct passwd *p; |
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133 | |
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134 | if ( getpwnam_r( name, &pw_passwd, buf, 1024, &p ) ) |
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135 | return NULL; |
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136 | |
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137 | return p; |
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138 | } |
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139 | |
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140 | int getpwuid_r( |
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141 | uid_t uid, |
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142 | struct passwd *pwd, |
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143 | char *buffer, |
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144 | size_t bufsize, |
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145 | struct passwd **result |
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146 | ) |
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147 | { |
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148 | FILE *fp; |
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149 | |
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150 | init_etc_passwd_group(); |
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151 | |
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152 | if ((fp = fopen ("/etc/passwd", "r")) == NULL) { |
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153 | errno = EINVAL; |
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154 | return -1; |
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155 | } |
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156 | |
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157 | while (fgets (buffer, bufsize, fp)) { |
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158 | sscanf (buffer, "%[^:]:%[^:]:%d:%d:%[^:]:%[^:]:%[^:]:%s\n", |
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159 | logname, password, &pw_passwd.pw_uid, |
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160 | &pw_passwd.pw_gid, comment, gecos, |
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161 | dir, shell); |
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162 | pwd->pw_name = logname; |
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163 | pwd->pw_passwd = password; |
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164 | pwd->pw_comment = comment; |
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165 | pwd->pw_gecos = gecos; |
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166 | pwd->pw_dir = dir; |
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167 | pwd->pw_shell = shell; |
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168 | |
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169 | if (uid == pwd->pw_uid) { |
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170 | fclose (fp); |
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171 | *result = pwd; |
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172 | return 0; |
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173 | } |
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174 | } |
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175 | fclose (fp); |
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176 | errno = EINVAL; |
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177 | return -1; |
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178 | } |
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179 | |
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180 | struct passwd *getpwuid( |
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181 | uid_t uid |
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182 | ) |
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183 | { |
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184 | char buf[1024]; |
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185 | struct passwd *p; |
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186 | |
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187 | if ( getpwuid_r( uid, &pw_passwd, buf, 1024, &p ) ) |
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188 | return NULL; |
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189 | |
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190 | return p; |
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191 | } |
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192 | |
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193 | struct passwd *getpwent() |
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194 | { |
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195 | char buf[1024]; |
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196 | |
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197 | if (passwd_fp == NULL) |
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198 | return NULL; |
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199 | |
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200 | if (fgets (buf, sizeof (buf), passwd_fp) == NULL) |
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201 | return NULL; |
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202 | |
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203 | sscanf (buf, "%[^:]:%[^:]:%d:%d:%[^:]:%[^:]:%[^:]:%s\n", |
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204 | logname, password, &pw_passwd.pw_uid, |
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205 | &pw_passwd.pw_gid, comment, gecos, |
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206 | dir, shell); |
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207 | pw_passwd.pw_name = logname; |
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208 | pw_passwd.pw_passwd = password; |
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209 | pw_passwd.pw_comment = comment; |
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210 | pw_passwd.pw_gecos = gecos; |
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211 | pw_passwd.pw_dir = dir; |
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212 | pw_passwd.pw_shell = shell; |
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213 | |
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214 | return &pw_passwd; |
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215 | } |
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216 | |
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217 | void setpwent( void ) |
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218 | { |
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219 | init_etc_passwd_group(); |
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220 | |
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221 | if (passwd_fp != NULL) |
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222 | fclose (passwd_fp); |
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223 | |
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224 | passwd_fp = fopen ("/etc/passwd", "r"); |
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225 | } |
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226 | |
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227 | void endpwent( void ) |
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228 | { |
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229 | if (passwd_fp != NULL) |
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230 | fclose (passwd_fp); |
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231 | } |
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