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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10 #include <nginx.h>
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11
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12
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13 static u_char error_tail[] =
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14 "<hr><center>" NGINX_VER "</center>" CRLF
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15 "</body>" CRLF
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16 "</html>" CRLF
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17 ;
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18
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19
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20 static u_char msie_stub[] =
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21 "<!-- The padding to disable MSIE's friendly error page -->" CRLF
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22 "<!-- The padding to disable MSIE's friendly error page -->" CRLF
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23 "<!-- The padding to disable MSIE's friendly error page -->" CRLF
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24 "<!-- The padding to disable MSIE's friendly error page -->" CRLF
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25 "<!-- The padding to disable MSIE's friendly error page -->" CRLF
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26 "<!-- The padding to disable MSIE's friendly error page -->" CRLF
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27 ;
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28
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29
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30 static char error_301_page[] =
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31 "<html>" CRLF
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32 "<head><title>301 Moved Permanently</title></head>" CRLF
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33 "<body bgcolor=\"white\">" CRLF
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34 "<center><h1>301 Moved Permanently</h1></center>" CRLF
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35 ;
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36
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37
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38 static char error_302_page[] =
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39 "<html>" CRLF
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40 "<head><title>302 Found</title></head>" CRLF
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41 "<body bgcolor=\"white\">" CRLF
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42 "<center><h1>302 Found</h1></center>" CRLF
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43 ;
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44
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45
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46 static char error_400_page[] =
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47 "<html>" CRLF
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48 "<head><title>400 Bad Request</title></head>" CRLF
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49 "<body bgcolor=\"white\">" CRLF
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50 "<center><h1>400 Bad Request</h1></center>" CRLF
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51 ;
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52
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53
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54 static char error_403_page[] =
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55 "<html>" CRLF
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56 "<head><title>403 Forbidden</title></head>" CRLF
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57 "<body bgcolor=\"white\">" CRLF
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58 "<center><h1>403 Forbidden</h1></center>" CRLF
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59 ;
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60
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61
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62 static char error_404_page[] =
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63 "<html>" CRLF
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64 "<head><title>404 Not Found</title></head>" CRLF
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65 "<body bgcolor=\"white\">" CRLF
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66 "<center><h1>404 Not Found</h1></center>" CRLF
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67 ;
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68
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69
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70 static char error_405_page[] =
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71 "<html>" CRLF
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72 "<head><title>405 Not Allowed</title></head>" CRLF
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73 "<body bgcolor=\"white\">" CRLF
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74 "<center><h1>405 Not Allowed</h1></center>" CRLF
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75 ;
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76
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77
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78 static char error_408_page[] =
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79 "<html>" CRLF
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80 "<head><title>408 Request Time-out</title></head>" CRLF
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81 "<body bgcolor=\"white\">" CRLF
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82 "<center><h1>408 Request Time-out</h1></center>" CRLF
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83 ;
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84
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85
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86 static char error_413_page[] =
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87 "<html>" CRLF
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88 "<head><title>413 Request Entity Too Large</title></head>" CRLF
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89 "<body bgcolor=\"white\">" CRLF
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90 "<center><h1>413 Request Entity Too Large</h1></center>" CRLF
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91 ;
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92
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93
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94 static char error_414_page[] =
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95 "<html>" CRLF
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96 "<head><title>414 Request-URI Too Large</title></head>" CRLF
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97 "<body bgcolor=\"white\">" CRLF
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98 "<center><h1>414 Request-URI Too Large</h1></center>" CRLF
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99 ;
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100
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101
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102 static char error_416_page[] =
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103 "<html>" CRLF
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104 "<head><title>416 Requested Range Not Satisfiable</title></head>" CRLF
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105 "<body bgcolor=\"white\">" CRLF
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106 "<center><h1>416 Requested Range Not Satisfiable</h1></center>" CRLF
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107 ;
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108
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109
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110 static char error_497_page[] =
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111 "<html>" CRLF
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112 "<head><title>400 The plain HTTP request was sent to HTTPS port</title></head>"
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113 CRLF
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114 "<body bgcolor=\"white\">" CRLF
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115 "<center><h1>400 Bad Request</h1></center>" CRLF
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116 "<center>The plain HTTP request was sent to HTTPS port</center>" CRLF
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117 ;
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118
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119
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120 static char error_500_page[] =
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121 "<html>" CRLF
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122 "<head><title>500 Internal Server Error</title></head>" CRLF
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123 "<body bgcolor=\"white\">" CRLF
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124 "<center><h1>500 Internal Server Error</h1></center>" CRLF
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125 ;
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126
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127
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128 static char error_501_page[] =
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129 "<html>" CRLF
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130 "<head><title>501 Method Not Implemented</title></head>" CRLF
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131 "<body bgcolor=\"white\">" CRLF
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132 "<center><h1>500 Method Not Implemented</h1></center>" CRLF
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133 ;
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134
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135
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136 static char error_502_page[] =
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137 "<html>" CRLF
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138 "<head><title>502 Bad Gateway</title></head>" CRLF
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139 "<body bgcolor=\"white\">" CRLF
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140 "<center><h1>502 Bad Gateway</h1></center>" CRLF
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141 ;
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142
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143
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144 static char error_503_page[] =
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145 "<html>" CRLF
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146 "<head><title>503 Service Temporarily Unavailable</title></head>" CRLF
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147 "<body bgcolor=\"white\">" CRLF
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148 "<center><h1>503 Service Temporarily Unavailable</h1></center>" CRLF
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149 ;
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150
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151
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152 static char error_504_page[] =
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153 "<html>" CRLF
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154 "<head><title>504 Gateway Time-out</title></head>" CRLF
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155 "<body bgcolor=\"white\">" CRLF
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156 "<center><h1>504 Gateway Time-out</h1></center>" CRLF
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157 ;
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158
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159
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160 static ngx_str_t error_pages[] = {
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161 /* ngx_null_string, */ /* 300 */
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162 ngx_string(error_301_page),
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163 ngx_string(error_302_page),
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164 ngx_null_string, /* 303 */
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165
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166 ngx_string(error_400_page),
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167 ngx_null_string, /* 401 */
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168 ngx_null_string, /* 402 */
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169 ngx_string(error_403_page),
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170 ngx_string(error_404_page),
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171 ngx_string(error_405_page),
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172 ngx_null_string, /* 406 */
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173 ngx_null_string, /* 407 */
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174 ngx_string(error_408_page),
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175 ngx_null_string, /* 409 */
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176 ngx_null_string, /* 410 */
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177 ngx_null_string, /* 411 */
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178 ngx_null_string, /* 412 */
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179 ngx_string(error_413_page),
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180 ngx_string(error_414_page),
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181 ngx_null_string, /* 415 */
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182 ngx_string(error_416_page),
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183
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184 ngx_string(error_497_page), /* 497, http to https */
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185 ngx_string(error_404_page), /* 498, invalid host name */
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186 ngx_null_string, /* 499, client closed connection */
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187
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188 ngx_string(error_500_page),
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189 ngx_string(error_501_page),
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190 ngx_string(error_502_page),
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191 ngx_string(error_503_page),
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192 ngx_string(error_504_page)
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193 };
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194
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195
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196 ngx_int_t ngx_http_special_response_handler(ngx_http_request_t *r, int error)
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197 {
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198 ngx_int_t rc;
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199 ngx_uint_t err, i, msie_padding;
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200 ngx_buf_t *b;
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201 ngx_chain_t *out, **ll, *cl;
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202 ngx_http_err_page_t *err_page;
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203 ngx_http_core_loc_conf_t *clcf;
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204
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205 rc = ngx_http_discard_body(r);
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206
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207 if (rc == NGX_HTTP_INTERNAL_SERVER_ERROR) {
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208 error = NGX_HTTP_INTERNAL_SERVER_ERROR;
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209 }
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210
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211 r->headers_out.status = error;
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212
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213 if (r->keepalive != 0) {
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214 switch (error) {
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215 case NGX_HTTP_BAD_REQUEST:
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216 case NGX_HTTP_REQUEST_ENTITY_TOO_LARGE:
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217 case NGX_HTTP_REQUEST_URI_TOO_LARGE:
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218 case NGX_HTTP_TO_HTTPS:
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219 case NGX_HTTP_INTERNAL_SERVER_ERROR:
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220 r->keepalive = 0;
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221 }
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222 }
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223
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224 if (r->lingering_close == 1) {
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225 switch (error) {
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226 case NGX_HTTP_BAD_REQUEST:
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227 case NGX_HTTP_TO_HTTPS:
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228 r->lingering_close = 0;
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229 }
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230 }
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231
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232 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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233
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234 if (r->err_ctx == NULL && clcf->error_pages) {
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26
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235
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0
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236 err_page = clcf->error_pages->elts;
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26
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237
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238 for (i = 0; i < clcf->error_pages->nelts; i++) {
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26
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239
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240 if (err_page[i].status == error) {
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26
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241
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0
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242 if (err_page[i].overwrite) {
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243 r->err_status = err_page[i].overwrite;
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244 } else {
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245 r->err_status = error;
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246 }
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26
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247
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248 r->err_ctx = r->ctx;
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26
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249
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250 return ngx_http_internal_redirect(r, &err_page[i].uri, NULL);
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251 }
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252 }
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253 }
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254
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255 if (error < NGX_HTTP_BAD_REQUEST) {
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256 /* 3XX */
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257 err = error - NGX_HTTP_MOVED_PERMANENTLY;
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258
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259 } else if (error < NGX_HTTP_NGX_CODES) {
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260 /* 4XX */
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261 err = error - NGX_HTTP_BAD_REQUEST + 3;
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262
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263 } else {
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264 /* 49X, 5XX */
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265 err = error - NGX_HTTP_NGX_CODES + 3 + 17;
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266
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267 switch (error) {
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268 case NGX_HTTP_TO_HTTPS:
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269 r->headers_out.status = NGX_HTTP_BAD_REQUEST;
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270 error = NGX_HTTP_BAD_REQUEST;
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271 break;
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272
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273 case NGX_HTTP_INVALID_HOST:
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274 r->headers_out.status = NGX_HTTP_NOT_FOUND;
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275 error = NGX_HTTP_NOT_FOUND;
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276 break;
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277 }
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278 }
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279
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280 msie_padding = 0;
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281
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282 if (error_pages[err].len) {
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283 r->headers_out.content_length_n = error_pages[err].len
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284 + sizeof(error_tail) - 1;
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285
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286 if (clcf->msie_padding
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287 && r->headers_in.msie
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288 && r->http_version >= NGX_HTTP_VERSION_10
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289 && error >= NGX_HTTP_BAD_REQUEST
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290 && error != NGX_HTTP_REQUEST_URI_TOO_LARGE)
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291 {
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292 r->headers_out.content_length_n += sizeof(msie_stub) - 1;
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293 msie_padding = 1;
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294 }
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295
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296 r->headers_out.content_type = ngx_list_push(&r->headers_out.headers);
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297 if (r->headers_out.content_type == NULL) {
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298 return NGX_ERROR;
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299 }
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300
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301 r->headers_out.content_type->key.len = sizeof("Content-Type") - 1;
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302 r->headers_out.content_type->key.data = (u_char *) "Content-Type";
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303 r->headers_out.content_type->value.len = sizeof("text/html") - 1;
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304 r->headers_out.content_type->value.data = (u_char *) "text/html";
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305
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306 } else {
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307 r->headers_out.content_length_n = -1;
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308 }
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309
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310 if (r->headers_out.content_length) {
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311 r->headers_out.content_length->key.len = 0;
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312 r->headers_out.content_length = NULL;
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313 }
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314
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315 rc = ngx_http_send_header(r);
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316
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317 if (rc == NGX_ERROR || r->header_only) {
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318 return rc;
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319 }
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320
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321 if (error_pages[err].len == 0) {
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322 return NGX_OK;
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323 }
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324
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325 out = NULL;
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326 ll = NULL;
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327
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328 if (!(b = ngx_calloc_buf(r->pool))) {
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329 return NGX_ERROR;
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330 }
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331 b->memory = 1;
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332 b->pos = error_pages[err].data;
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333 b->last = error_pages[err].data + error_pages[err].len;
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334
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335 ngx_alloc_link_and_set_buf(cl, b, r->pool, NGX_ERROR);
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336 ngx_chain_add_link(out, ll, cl);
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337
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338
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339 if (!(b = ngx_calloc_buf(r->pool))) {
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340 return NGX_ERROR;
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341 }
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342 b->memory = 1;
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343 b->pos = error_tail;
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344 b->last = error_tail + sizeof(error_tail) - 1;
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345
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346 ngx_alloc_link_and_set_buf(cl, b, r->pool, NGX_ERROR);
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347 ngx_chain_add_link(out, ll, cl);
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348
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349 if (msie_padding) {
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350 if (!(b = ngx_calloc_buf(r->pool))) {
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351 return NGX_ERROR;
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352 }
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353 b->memory = 1;
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354 b->pos = msie_stub;
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355 b->last = msie_stub + sizeof(msie_stub) - 1;
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356
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357 ngx_alloc_link_and_set_buf(cl, b, r->pool, NGX_ERROR);
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358 ngx_chain_add_link(out, ll, cl);
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359 }
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360
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361 b->last_buf = 1;
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362
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363 return ngx_http_output_filter(r, out);
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364 }
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