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50
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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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230
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13 static ngx_int_t ngx_http_header_filter_init(ngx_conf_t *cf);
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50
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14 static ngx_int_t ngx_http_header_filter(ngx_http_request_t *r);
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15
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16
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17 static ngx_http_module_t ngx_http_header_filter_module_ctx = {
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58
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18 NULL, /* preconfiguration */
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230
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19 ngx_http_header_filter_init, /* postconfiguration */
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50
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20
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21 NULL, /* create main configuration */
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22 NULL, /* init main configuration */
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23
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24 NULL, /* create server configuration */
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25 NULL, /* merge server configuration */
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26
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27 NULL, /* create location configuration */
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28 NULL, /* merge location configuration */
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29 };
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30
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31
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32 ngx_module_t ngx_http_header_filter_module = {
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58
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33 NGX_MODULE_V1,
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50
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34 &ngx_http_header_filter_module_ctx, /* module context */
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35 NULL, /* module directives */
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36 NGX_HTTP_MODULE, /* module type */
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90
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37 NULL, /* init master */
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230
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38 NULL, /* init module */
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90
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39 NULL, /* init process */
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40 NULL, /* init thread */
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41 NULL, /* exit thread */
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42 NULL, /* exit process */
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43 NULL, /* exit master */
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44 NGX_MODULE_V1_PADDING
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50
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45 };
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46
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47
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342
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48 static char ngx_http_server_string[] = "Server: nginx" CRLF;
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49 static char ngx_http_server_full_string[] = "Server: " NGINX_VER CRLF;
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50
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50
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51
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58
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52 static ngx_str_t ngx_http_status_lines[] = {
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50
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53
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54 ngx_string("200 OK"),
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182
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55 ngx_string("201 Created"),
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50
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56 ngx_null_string, /* "202 Accepted" */
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57 ngx_null_string, /* "203 Non-Authoritative Information" */
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60
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58 ngx_string("204 No Content"),
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50
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59 ngx_null_string, /* "205 Reset Content" */
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60 ngx_string("206 Partial Content"),
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61
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62 /* ngx_null_string, */ /* "207 Multi-Status" */
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63
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64 #define NGX_HTTP_LEVEL_200 7
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65
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66 /* ngx_null_string, */ /* "300 Multiple Choices" */
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67
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68 ngx_string("301 Moved Permanently"),
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69 ngx_string("302 Moved Temporarily"),
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70 ngx_null_string, /* "303 See Other" */
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71 ngx_string("304 Not Modified"),
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72
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73 /* ngx_null_string, */ /* "305 Use Proxy" */
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74 /* ngx_null_string, */ /* "306 unused" */
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75 /* ngx_null_string, */ /* "307 Temporary Redirect" */
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76
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77 #define NGX_HTTP_LEVEL_300 4
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78
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79 ngx_string("400 Bad Request"),
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80 ngx_string("401 Unauthorized"),
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81 ngx_string("402 Payment Required"),
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82 ngx_string("403 Forbidden"),
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83 ngx_string("404 Not Found"),
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84 ngx_string("405 Not Allowed"),
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85 ngx_string("406 Not Acceptable"),
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86 ngx_null_string, /* "407 Proxy Authentication Required" */
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87 ngx_string("408 Request Time-out"),
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212
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88 ngx_string("409 Conflict"),
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50
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89 ngx_string("410 Gone"),
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90 ngx_string("411 Length Required"),
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276
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91 ngx_string("412 Precondition Failed"),
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50
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92 ngx_string("413 Request Entity Too Large"),
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93 ngx_null_string, /* "414 Request-URI Too Large", but we never send it
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94 * because we treat such requests as the HTTP/0.9
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95 * requests and send only a body without a header
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96 */
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186
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97 ngx_string("415 Unsupported Media Type"),
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50
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98 ngx_string("416 Requested Range Not Satisfiable"),
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99
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100 /* ngx_null_string, */ /* "417 Expectation Failed" */
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101 /* ngx_null_string, */ /* "418 unused" */
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102 /* ngx_null_string, */ /* "419 unused" */
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103 /* ngx_null_string, */ /* "420 unused" */
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104 /* ngx_null_string, */ /* "421 unused" */
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105 /* ngx_null_string, */ /* "422 Unprocessable Entity" */
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106 /* ngx_null_string, */ /* "423 Locked" */
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107 /* ngx_null_string, */ /* "424 Failed Dependency" */
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108
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109 #define NGX_HTTP_LEVEL_400 17
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110
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111 ngx_string("500 Internal Server Error"),
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112 ngx_string("501 Method Not Implemented"),
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113 ngx_string("502 Bad Gateway"),
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114 ngx_string("503 Service Temporarily Unavailable"),
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186
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115 ngx_string("504 Gateway Time-out"),
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50
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116
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186
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117 ngx_null_string, /* "505 HTTP Version Not Supported" */
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118 ngx_null_string, /* "506 Variant Also Negotiates" */
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119 ngx_string("507 Insufficient Storage"),
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120 /* ngx_null_string, */ /* "508 unused" */
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121 /* ngx_null_string, */ /* "509 unused" */
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122 /* ngx_null_string, */ /* "510 Not Extended" */
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123 };
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124
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125
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118
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126 ngx_http_header_out_t ngx_http_headers_out[] = {
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127 { ngx_string("Server"), offsetof(ngx_http_headers_out_t, server) },
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128 { ngx_string("Date"), offsetof(ngx_http_headers_out_t, date) },
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58
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129 #if 0
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130 { ngx_string("Content-Type"),
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131 offsetof(ngx_http_headers_out_t, content_type) },
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58
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132 #endif
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50
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133 { ngx_string("Content-Length"),
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134 offsetof(ngx_http_headers_out_t, content_length) },
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135 { ngx_string("Content-Encoding"),
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136 offsetof(ngx_http_headers_out_t, content_encoding) },
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137 { ngx_string("Location"), offsetof(ngx_http_headers_out_t, location) },
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138 { ngx_string("Last-Modified"),
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139 offsetof(ngx_http_headers_out_t, last_modified) },
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140 { ngx_string("Accept-Ranges"),
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141 offsetof(ngx_http_headers_out_t, accept_ranges) },
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142 { ngx_string("Expires"), offsetof(ngx_http_headers_out_t, expires) },
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143 { ngx_string("Cache-Control"),
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144 offsetof(ngx_http_headers_out_t, cache_control) },
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145 { ngx_string("ETag"), offsetof(ngx_http_headers_out_t, etag) },
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146
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147 { ngx_null_string, 0 }
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148 };
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149
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150
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151 static ngx_int_t
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152 ngx_http_header_filter(ngx_http_request_t *r)
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153 {
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154 u_char *p;
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155 size_t len;
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362
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156 ngx_str_t host;
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230
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157 ngx_buf_t *b;
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454
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158 ngx_uint_t status, i, port;
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50
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159 ngx_chain_t out;
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160 ngx_list_part_t *part;
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161 ngx_table_elt_t *header;
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162 ngx_http_core_loc_conf_t *clcf;
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362
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163 ngx_http_core_srv_conf_t *cscf;
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454
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164 struct sockaddr_in *sin;
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165 #if (NGX_HAVE_INET6)
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166 struct sockaddr_in6 *sin6;
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167 #endif
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448
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168 u_char addr[NGX_SOCKADDR_STRLEN];
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50
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169
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216
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170 r->header_sent = 1;
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171
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146
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172 if (r != r->main) {
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58
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173 return NGX_OK;
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174 }
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175
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50
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176 if (r->http_version < NGX_HTTP_VERSION_10) {
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177 return NGX_OK;
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178 }
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179
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180 if (r->method == NGX_HTTP_HEAD) {
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181 r->header_only = 1;
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182 }
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183
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184 if (r->headers_out.last_modified_time != -1) {
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185 if (r->headers_out.status != NGX_HTTP_OK
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60
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186 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
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187 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED)
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50
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188 {
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189 r->headers_out.last_modified_time = -1;
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190 r->headers_out.last_modified = NULL;
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191 }
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192 }
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193
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194 len = sizeof("HTTP/1.x ") - 1 + sizeof(CRLF) - 1
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195 /* the end of the header */
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196 + sizeof(CRLF) - 1;
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197
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198 /* status line */
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199
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200 if (r->headers_out.status_line.len) {
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201 len += r->headers_out.status_line.len;
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202 #if (NGX_SUPPRESS_WARN)
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203 status = NGX_INVALID_ARRAY_INDEX;
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204 #endif
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205
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206 } else {
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207
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208 if (r->headers_out.status < NGX_HTTP_MOVED_PERMANENTLY) {
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209 /* 2XX */
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210 status = r->headers_out.status - NGX_HTTP_OK;
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211
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60
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212 if (r->headers_out.status == NGX_HTTP_NO_CONTENT) {
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213 r->header_only = 1;
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214 r->headers_out.content_type.len = 0;
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215 r->headers_out.content_type.data = NULL;
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216 r->headers_out.last_modified_time = -1;
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217 r->headers_out.last_modified = NULL;
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218 r->headers_out.content_length = NULL;
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219 r->headers_out.content_length_n = -1;
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220 }
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221
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50
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222 } else if (r->headers_out.status < NGX_HTTP_BAD_REQUEST) {
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223 /* 3XX */
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224 status = r->headers_out.status - NGX_HTTP_MOVED_PERMANENTLY
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225 + NGX_HTTP_LEVEL_200;
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226
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227 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) {
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228 r->header_only = 1;
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229 }
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230
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231 } else if (r->headers_out.status < NGX_HTTP_INTERNAL_SERVER_ERROR) {
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232 /* 4XX */
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233 status = r->headers_out.status - NGX_HTTP_BAD_REQUEST
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234 + NGX_HTTP_LEVEL_200
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235 + NGX_HTTP_LEVEL_300;
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236
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237 } else {
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238 /* 5XX */
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239 status = r->headers_out.status - NGX_HTTP_INTERNAL_SERVER_ERROR
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240 + NGX_HTTP_LEVEL_200
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241 + NGX_HTTP_LEVEL_300
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242 + NGX_HTTP_LEVEL_400;
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243 }
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244
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245 len += ngx_http_status_lines[status].len;
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50
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246 }
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247
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342
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248 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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249
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58
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250 if (r->headers_out.server == NULL) {
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342
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251 len += clcf->server_tokens ? sizeof(ngx_http_server_full_string) - 1:
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252 sizeof(ngx_http_server_string) - 1;
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253 }
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254
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58
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255 if (r->headers_out.date == NULL) {
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256 len += sizeof("Date: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
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257 }
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258
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58
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259 if (r->headers_out.content_type.len) {
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50
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260 len += sizeof("Content-Type: ") - 1
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58
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261 + r->headers_out.content_type.len + 2;
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262
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206
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263 if (r->headers_out.content_type_len == r->headers_out.content_type.len
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264 && r->headers_out.charset.len)
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265 {
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50
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266 len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
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267 }
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268 }
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269
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58
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270 if (r->headers_out.content_length == NULL
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271 && r->headers_out.content_length_n >= 0)
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272 {
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273 len += sizeof("Content-Length: ") - 1 + NGX_OFF_T_LEN + 2;
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274 }
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275
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276 if (r->headers_out.last_modified == NULL
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277 && r->headers_out.last_modified_time != -1)
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278 {
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279 len += sizeof("Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
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280 }
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281
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50
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282 if (r->headers_out.location
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283 && r->headers_out.location->value.len
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284 && r->headers_out.location->value.data[0] == '/')
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285 {
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58
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286 r->headers_out.location->hash = 0;
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287
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362
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288 if (clcf->server_name_in_redirect) {
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289 cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
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290 host = cscf->server_name;
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291
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376
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292 } else if (r->headers_in.server.len) {
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293 host = r->headers_in.server;
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362
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294
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295 } else {
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448
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296 host.len = NGX_SOCKADDR_STRLEN;
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362
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297 host.data = addr;
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298
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299 if (ngx_http_server_addr(r, &host) != NGX_OK) {
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300 return NGX_ERROR;
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301 }
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302 }
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303
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454
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304 switch (r->connection->local_sockaddr->sa_family) {
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66
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305
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454
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306 #if (NGX_HAVE_INET6)
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307 case AF_INET6:
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308 sin6 = (struct sockaddr_in6 *) r->connection->local_sockaddr;
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309 port = ntohs(sin6->sin6_port);
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310 break;
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311 #endif
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312 default: /* AF_INET */
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313 sin = (struct sockaddr_in *) r->connection->local_sockaddr;
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314 port = ntohs(sin->sin_port);
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315 break;
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316 }
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50
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317
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454
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318 len += sizeof("Location: https://") - 1
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319 + host.len
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320 + r->headers_out.location->value.len + 2;
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321
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322 if (clcf->port_in_redirect) {
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323
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324 #if (NGX_HTTP_SSL)
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456
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325 if (r->connection->ssl)
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326 port = (port == 443) ? 0 : port;
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327 else
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66
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328 #endif
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456
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329 port = (port == 80) ? 0 : port;
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330 }
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66
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331
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454
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332 if (port) {
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333 len += sizeof(":65535") - 1;
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50
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334 }
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362
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335
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336 } else {
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337 host.len = 0;
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338 host.data = NULL;
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454
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339 port = 0;
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50
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340 }
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341
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342 if (r->chunked) {
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343 len += sizeof("Transfer-Encoding: chunked" CRLF) - 1;
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344 }
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345
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346 if (r->keepalive) {
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347 len += sizeof("Connection: keep-alive" CRLF) - 1;
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348
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349 /*
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350 * MSIE and Opera ignore the "Keep-Alive: timeout=<N>" header.
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351 * MSIE keeps the connection alive for about 60-65 seconds.
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352 * Opera keeps the connection alive very long.
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353 * Mozilla keeps the connection alive for N plus about 1-10 seconds.
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354 * Konqueror keeps the connection alive for about N seconds.
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355 */
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356
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357 if (clcf->keepalive_header) {
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358 len += sizeof("Keep-Alive: timeout=") - 1 + NGX_TIME_T_LEN + 2;
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359 }
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360
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361 } else {
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362 len += sizeof("Connection: closed" CRLF) - 1;
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363 }
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364
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386
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365 #if (NGX_HTTP_GZIP)
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382
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366 if (r->gzip && clcf->gzip_vary) {
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367 len += sizeof("Vary: Accept-Encoding" CRLF) - 1;
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368 }
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386
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369 #endif
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382
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370
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50
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371 part = &r->headers_out.headers.part;
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372 header = part->elts;
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373
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374 for (i = 0; /* void */; i++) {
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375
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376 if (i >= part->nelts) {
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377 if (part->next == NULL) {
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378 break;
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379 }
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380
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381 part = part->next;
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382 header = part->elts;
|
|
|
383 i = 0;
|
|
|
384 }
|
|
|
385
|
|
58
|
386 if (header[i].hash == 0) {
|
|
50
|
387 continue;
|
|
|
388 }
|
|
|
389
|
|
|
390 len += header[i].key.len + sizeof(": ") - 1 + header[i].value.len
|
|
|
391 + sizeof(CRLF) - 1;
|
|
|
392 }
|
|
|
393
|
|
|
394 b = ngx_create_temp_buf(r->pool, len);
|
|
|
395 if (b == NULL) {
|
|
|
396 return NGX_ERROR;
|
|
|
397 }
|
|
|
398
|
|
|
399 /* "HTTP/1.x " */
|
|
|
400 b->last = ngx_cpymem(b->last, "HTTP/1.1 ", sizeof("HTTP/1.x ") - 1);
|
|
|
401
|
|
|
402 /* status line */
|
|
|
403 if (r->headers_out.status_line.len) {
|
|
122
|
404 b->last = ngx_copy(b->last, r->headers_out.status_line.data,
|
|
|
405 r->headers_out.status_line.len);
|
|
50
|
406
|
|
|
407 } else {
|
|
122
|
408 b->last = ngx_copy(b->last, ngx_http_status_lines[status].data,
|
|
|
409 ngx_http_status_lines[status].len);
|
|
50
|
410 }
|
|
|
411 *b->last++ = CR; *b->last++ = LF;
|
|
|
412
|
|
58
|
413 if (r->headers_out.server == NULL) {
|
|
342
|
414 if (clcf->server_tokens) {
|
|
|
415 p = (u_char *) ngx_http_server_full_string;
|
|
|
416 len = sizeof(ngx_http_server_full_string) - 1;
|
|
|
417
|
|
|
418 } else {
|
|
|
419 p = (u_char *) ngx_http_server_string;
|
|
|
420 len = sizeof(ngx_http_server_string) - 1;
|
|
|
421 }
|
|
|
422
|
|
|
423 b->last = ngx_cpymem(b->last, p, len);
|
|
50
|
424 }
|
|
|
425
|
|
58
|
426 if (r->headers_out.date == NULL) {
|
|
50
|
427 b->last = ngx_cpymem(b->last, "Date: ", sizeof("Date: ") - 1);
|
|
|
428 b->last = ngx_cpymem(b->last, ngx_cached_http_time.data,
|
|
|
429 ngx_cached_http_time.len);
|
|
|
430
|
|
|
431 *b->last++ = CR; *b->last++ = LF;
|
|
|
432 }
|
|
|
433
|
|
58
|
434 if (r->headers_out.content_type.len) {
|
|
50
|
435 b->last = ngx_cpymem(b->last, "Content-Type: ",
|
|
|
436 sizeof("Content-Type: ") - 1);
|
|
|
437 p = b->last;
|
|
122
|
438 b->last = ngx_copy(b->last, r->headers_out.content_type.data,
|
|
|
439 r->headers_out.content_type.len);
|
|
50
|
440
|
|
206
|
441 if (r->headers_out.content_type_len == r->headers_out.content_type.len
|
|
|
442 && r->headers_out.charset.len)
|
|
|
443 {
|
|
50
|
444 b->last = ngx_cpymem(b->last, "; charset=",
|
|
|
445 sizeof("; charset=") - 1);
|
|
122
|
446 b->last = ngx_copy(b->last, r->headers_out.charset.data,
|
|
|
447 r->headers_out.charset.len);
|
|
50
|
448
|
|
58
|
449 /* update r->headers_out.content_type for possible logging */
|
|
|
450
|
|
|
451 r->headers_out.content_type.len = b->last - p;
|
|
|
452 r->headers_out.content_type.data = p;
|
|
50
|
453 }
|
|
|
454
|
|
|
455 *b->last++ = CR; *b->last++ = LF;
|
|
|
456 }
|
|
|
457
|
|
58
|
458 if (r->headers_out.content_length == NULL
|
|
|
459 && r->headers_out.content_length_n >= 0)
|
|
|
460 {
|
|
|
461 b->last = ngx_sprintf(b->last, "Content-Length: %O" CRLF,
|
|
|
462 r->headers_out.content_length_n);
|
|
|
463 }
|
|
|
464
|
|
|
465 if (r->headers_out.last_modified == NULL
|
|
|
466 && r->headers_out.last_modified_time != -1)
|
|
|
467 {
|
|
|
468 b->last = ngx_cpymem(b->last, "Last-Modified: ",
|
|
|
469 sizeof("Last-Modified: ") - 1);
|
|
|
470 b->last = ngx_http_time(b->last, r->headers_out.last_modified_time);
|
|
|
471
|
|
|
472 *b->last++ = CR; *b->last++ = LF;
|
|
|
473 }
|
|
|
474
|
|
362
|
475 if (host.data) {
|
|
|
476
|
|
50
|
477 p = b->last + sizeof("Location: ") - 1;
|
|
66
|
478
|
|
|
479 b->last = ngx_cpymem(b->last, "Location: http",
|
|
|
480 sizeof("Location: http") - 1);
|
|
|
481
|
|
|
482 #if (NGX_HTTP_SSL)
|
|
|
483 if (r->connection->ssl) {
|
|
|
484 *b->last++ ='s';
|
|
|
485 }
|
|
|
486 #endif
|
|
|
487
|
|
|
488 *b->last++ = ':'; *b->last++ = '/'; *b->last++ = '/';
|
|
362
|
489 b->last = ngx_copy(b->last, host.data, host.len);
|
|
66
|
490
|
|
454
|
491 if (port) {
|
|
|
492 b->last = ngx_sprintf(b->last, ":%ui", port);
|
|
50
|
493 }
|
|
|
494
|
|
122
|
495 b->last = ngx_copy(b->last, r->headers_out.location->value.data,
|
|
|
496 r->headers_out.location->value.len);
|
|
50
|
497
|
|
58
|
498 /* update r->headers_out.location->value for possible logging */
|
|
|
499
|
|
50
|
500 r->headers_out.location->value.len = b->last - p;
|
|
|
501 r->headers_out.location->value.data = p;
|
|
218
|
502 r->headers_out.location->key.len = sizeof("Location: ") - 1;
|
|
|
503 r->headers_out.location->key.data = (u_char *) "Location: ";
|
|
50
|
504
|
|
|
505 *b->last++ = CR; *b->last++ = LF;
|
|
|
506 }
|
|
|
507
|
|
|
508 if (r->chunked) {
|
|
|
509 b->last = ngx_cpymem(b->last, "Transfer-Encoding: chunked" CRLF,
|
|
|
510 sizeof("Transfer-Encoding: chunked" CRLF) - 1);
|
|
|
511 }
|
|
|
512
|
|
|
513 if (r->keepalive) {
|
|
|
514 b->last = ngx_cpymem(b->last, "Connection: keep-alive" CRLF,
|
|
|
515 sizeof("Connection: keep-alive" CRLF) - 1);
|
|
|
516
|
|
|
517 if (clcf->keepalive_header) {
|
|
|
518 b->last = ngx_sprintf(b->last, "Keep-Alive: timeout=%T" CRLF,
|
|
|
519 clcf->keepalive_header);
|
|
|
520 }
|
|
|
521
|
|
|
522 } else {
|
|
|
523 b->last = ngx_cpymem(b->last, "Connection: close" CRLF,
|
|
|
524 sizeof("Connection: close" CRLF) - 1);
|
|
|
525 }
|
|
|
526
|
|
386
|
527 #if (NGX_HTTP_GZIP)
|
|
382
|
528 if (r->gzip && clcf->gzip_vary) {
|
|
|
529 b->last = ngx_cpymem(b->last, "Vary: Accept-Encoding" CRLF,
|
|
|
530 sizeof("Vary: Accept-Encoding" CRLF) - 1);
|
|
|
531 }
|
|
386
|
532 #endif
|
|
382
|
533
|
|
50
|
534 part = &r->headers_out.headers.part;
|
|
|
535 header = part->elts;
|
|
|
536
|
|
|
537 for (i = 0; /* void */; i++) {
|
|
|
538
|
|
|
539 if (i >= part->nelts) {
|
|
|
540 if (part->next == NULL) {
|
|
|
541 break;
|
|
|
542 }
|
|
|
543
|
|
|
544 part = part->next;
|
|
|
545 header = part->elts;
|
|
|
546 i = 0;
|
|
|
547 }
|
|
|
548
|
|
58
|
549 if (header[i].hash == 0) {
|
|
50
|
550 continue;
|
|
|
551 }
|
|
|
552
|
|
122
|
553 b->last = ngx_copy(b->last, header[i].key.data, header[i].key.len);
|
|
378
|
554 *b->last++ = ':'; *b->last++ = ' ';
|
|
50
|
555
|
|
122
|
556 b->last = ngx_copy(b->last, header[i].value.data, header[i].value.len);
|
|
50
|
557 *b->last++ = CR; *b->last++ = LF;
|
|
|
558 }
|
|
|
559
|
|
358
|
560 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
561 "%*s\n", (size_t) (b->last - b->pos), b->pos);
|
|
50
|
562
|
|
|
563 /* the end of HTTP header */
|
|
|
564 *b->last++ = CR; *b->last++ = LF;
|
|
|
565
|
|
|
566 r->header_size = b->last - b->pos;
|
|
|
567
|
|
|
568 if (r->header_only) {
|
|
|
569 b->last_buf = 1;
|
|
|
570 }
|
|
|
571
|
|
|
572 out.buf = b;
|
|
|
573 out.next = NULL;
|
|
|
574
|
|
|
575 return ngx_http_write_filter(r, &out);
|
|
|
576 }
|
|
|
577
|
|
|
578
|
|
|
579 static ngx_int_t
|
|
230
|
580 ngx_http_header_filter_init(ngx_conf_t *cf)
|
|
50
|
581 {
|
|
|
582 ngx_http_top_header_filter = ngx_http_header_filter;
|
|
|
583
|
|
|
584 return NGX_OK;
|
|
|
585 }
|
