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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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13 static ngx_int_t ngx_http_header_filter_init(ngx_cycle_t *cycle);
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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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19 NULL, /* 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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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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38 ngx_http_header_filter_init, /* 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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58
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48 static char ngx_http_server_string[] = "Server: " NGINX_VER CRLF;
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50
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49
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50
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58
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51 static ngx_str_t ngx_http_status_lines[] = {
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50
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52
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53 ngx_string("200 OK"),
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182
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54 ngx_string("201 Created"),
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55 ngx_null_string, /* "202 Accepted" */
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56 ngx_null_string, /* "203 Non-Authoritative Information" */
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60
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57 ngx_string("204 No Content"),
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58 ngx_null_string, /* "205 Reset Content" */
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59 ngx_string("206 Partial Content"),
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60
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61 /* ngx_null_string, */ /* "207 Multi-Status" */
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62
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63 #define NGX_HTTP_LEVEL_200 7
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64
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65 /* ngx_null_string, */ /* "300 Multiple Choices" */
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66
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67 ngx_string("301 Moved Permanently"),
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68 ngx_string("302 Moved Temporarily"),
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69 ngx_null_string, /* "303 See Other" */
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70 ngx_string("304 Not Modified"),
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71
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72 /* ngx_null_string, */ /* "305 Use Proxy" */
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73 /* ngx_null_string, */ /* "306 unused" */
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74 /* ngx_null_string, */ /* "307 Temporary Redirect" */
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75
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76 #define NGX_HTTP_LEVEL_300 4
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77
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78 ngx_string("400 Bad Request"),
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79 ngx_string("401 Unauthorized"),
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80 ngx_string("402 Payment Required"),
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81 ngx_string("403 Forbidden"),
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82 ngx_string("404 Not Found"),
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83 ngx_string("405 Not Allowed"),
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84 ngx_string("406 Not Acceptable"),
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85 ngx_null_string, /* "407 Proxy Authentication Required" */
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86 ngx_string("408 Request Time-out"),
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87 ngx_null_string, /* "409 Conflict" */
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88 ngx_string("410 Gone"),
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89 ngx_string("411 Length Required"),
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90 ngx_null_string, /* "412 Precondition Failed" */
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91 ngx_string("413 Request Entity Too Large"),
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92 ngx_null_string, /* "414 Request-URI Too Large", but we never send it
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93 * because we treat such requests as the HTTP/0.9
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94 * requests and send only a body without a header
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95 */
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96 ngx_string("415 Unsupported Media Type"),
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97 ngx_string("416 Requested Range Not Satisfiable"),
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98
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99 /* ngx_null_string, */ /* "417 Expectation Failed" */
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100 /* ngx_null_string, */ /* "418 unused" */
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101 /* ngx_null_string, */ /* "419 unused" */
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102 /* ngx_null_string, */ /* "420 unused" */
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103 /* ngx_null_string, */ /* "421 unused" */
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104 /* ngx_null_string, */ /* "422 Unprocessable Entity" */
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105 /* ngx_null_string, */ /* "423 Locked" */
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106 /* ngx_null_string, */ /* "424 Failed Dependency" */
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107
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108 #define NGX_HTTP_LEVEL_400 17
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109
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110 ngx_string("500 Internal Server Error"),
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111 ngx_string("501 Method Not Implemented"),
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112 ngx_string("502 Bad Gateway"),
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113 ngx_string("503 Service Temporarily Unavailable"),
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186
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114 ngx_string("504 Gateway Time-out"),
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115
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186
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116 ngx_null_string, /* "505 HTTP Version Not Supported" */
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117 ngx_null_string, /* "506 Variant Also Negotiates" */
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118 ngx_string("507 Insufficient Storage"),
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119 /* ngx_null_string, */ /* "508 unused" */
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120 /* ngx_null_string, */ /* "509 unused" */
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121 /* ngx_null_string, */ /* "510 Not Extended" */
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122 };
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123
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124
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118
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125 ngx_http_header_out_t ngx_http_headers_out[] = {
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126 { ngx_string("Server"), offsetof(ngx_http_headers_out_t, server) },
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127 { ngx_string("Date"), offsetof(ngx_http_headers_out_t, date) },
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58
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128 #if 0
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129 { ngx_string("Content-Type"),
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130 offsetof(ngx_http_headers_out_t, content_type) },
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58
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131 #endif
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132 { ngx_string("Content-Length"),
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133 offsetof(ngx_http_headers_out_t, content_length) },
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134 { ngx_string("Content-Encoding"),
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135 offsetof(ngx_http_headers_out_t, content_encoding) },
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136 { ngx_string("Location"), offsetof(ngx_http_headers_out_t, location) },
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137 { ngx_string("Last-Modified"),
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138 offsetof(ngx_http_headers_out_t, last_modified) },
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139 { ngx_string("Accept-Ranges"),
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140 offsetof(ngx_http_headers_out_t, accept_ranges) },
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141 { ngx_string("Expires"), offsetof(ngx_http_headers_out_t, expires) },
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142 { ngx_string("Cache-Control"),
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143 offsetof(ngx_http_headers_out_t, cache_control) },
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144 { ngx_string("ETag"), offsetof(ngx_http_headers_out_t, etag) },
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145
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146 { ngx_null_string, 0 }
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147 };
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148
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149
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150 static ngx_int_t
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151 ngx_http_header_filter(ngx_http_request_t *r)
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152 {
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153 u_char *p;
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154 size_t len;
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155 ngx_uint_t status, i;
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156 ngx_buf_t *b;
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157 ngx_chain_t out;
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158 ngx_list_part_t *part;
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159 ngx_table_elt_t *header;
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160 ngx_http_core_loc_conf_t *clcf;
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161
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146
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162 if (r != r->main) {
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163 return NGX_OK;
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164 }
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165
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166 if (r->http_version < NGX_HTTP_VERSION_10) {
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167 return NGX_OK;
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168 }
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169
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170 if (r->method == NGX_HTTP_HEAD) {
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171 r->header_only = 1;
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172 }
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173
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174 if (r->headers_out.last_modified_time != -1) {
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175 if (r->headers_out.status != NGX_HTTP_OK
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60
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176 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
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177 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED)
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178 {
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179 r->headers_out.last_modified_time = -1;
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180 r->headers_out.last_modified = NULL;
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181 }
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182 }
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183
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184 len = sizeof("HTTP/1.x ") - 1 + sizeof(CRLF) - 1
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185 /* the end of the header */
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186 + sizeof(CRLF) - 1;
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187
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188 /* status line */
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189
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190 if (r->headers_out.status_line.len) {
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191 len += r->headers_out.status_line.len;
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192 #if (NGX_SUPPRESS_WARN)
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193 status = NGX_INVALID_ARRAY_INDEX;
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194 #endif
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195
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196 } else {
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197
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198 if (r->headers_out.status < NGX_HTTP_MOVED_PERMANENTLY) {
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199 /* 2XX */
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200 status = r->headers_out.status - NGX_HTTP_OK;
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201
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60
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202 if (r->headers_out.status == NGX_HTTP_NO_CONTENT) {
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203 r->header_only = 1;
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204 r->headers_out.content_type.len = 0;
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205 r->headers_out.content_type.data = NULL;
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206 r->headers_out.last_modified_time = -1;
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207 r->headers_out.last_modified = NULL;
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208 r->headers_out.content_length = NULL;
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209 r->headers_out.content_length_n = -1;
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210 }
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211
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212 } else if (r->headers_out.status < NGX_HTTP_BAD_REQUEST) {
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213 /* 3XX */
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214 status = r->headers_out.status - NGX_HTTP_MOVED_PERMANENTLY
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215 + NGX_HTTP_LEVEL_200;
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216
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217 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) {
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218 r->header_only = 1;
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219 }
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220
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221 } else if (r->headers_out.status < NGX_HTTP_INTERNAL_SERVER_ERROR) {
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222 /* 4XX */
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223 status = r->headers_out.status - NGX_HTTP_BAD_REQUEST
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224 + NGX_HTTP_LEVEL_200
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225 + NGX_HTTP_LEVEL_300;
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226
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227 } else {
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228 /* 5XX */
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229 status = r->headers_out.status - NGX_HTTP_INTERNAL_SERVER_ERROR
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230 + NGX_HTTP_LEVEL_200
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231 + NGX_HTTP_LEVEL_300
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232 + NGX_HTTP_LEVEL_400;
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233 }
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234
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235 len += ngx_http_status_lines[status].len;
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236 }
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237
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238 if (r->headers_out.server == NULL) {
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239 len += sizeof(ngx_http_server_string) - 1;
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240 }
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241
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242 if (r->headers_out.date == NULL) {
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243 len += sizeof("Date: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
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244 }
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245
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246 if (r->headers_out.content_type.len) {
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247 len += sizeof("Content-Type: ") - 1
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248 + r->headers_out.content_type.len + 2;
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249
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206
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250 if (r->headers_out.content_type_len == r->headers_out.content_type.len
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251 && r->headers_out.charset.len)
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252 {
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253 len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
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254 }
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255 }
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256
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58
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257 if (r->headers_out.content_length == NULL
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258 && r->headers_out.content_length_n >= 0)
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259 {
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260 len += sizeof("Content-Length: ") - 1 + NGX_OFF_T_LEN + 2;
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261 }
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262
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263 if (r->headers_out.last_modified == NULL
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264 && r->headers_out.last_modified_time != -1)
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265 {
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266 len += sizeof("Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
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267 }
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268
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269 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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270
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271 if (r->headers_out.location
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272 && r->headers_out.location->value.len
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273 && r->headers_out.location->value.data[0] == '/')
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274 {
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275 r->headers_out.location->hash = 0;
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276
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66
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277 #if (NGX_HTTP_SSL)
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278 if (r->connection->ssl) {
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279 len += sizeof("Location: https://") - 1
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280 + r->server_name.len
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281 + r->headers_out.location->value.len + 2;
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282
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70
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283 if (clcf->port_in_redirect && r->port != 443) {
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284 len += r->port_text->len;
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285 }
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286
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66
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287 } else
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288 #endif
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289 {
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290 len += sizeof("Location: http://") - 1
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291 + r->server_name.len
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292 + r->headers_out.location->value.len + 2;
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293
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70
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294 if (clcf->port_in_redirect && r->port != 80) {
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295 len += r->port_text->len;
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296 }
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297 }
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298 }
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299
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300 if (r->chunked) {
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301 len += sizeof("Transfer-Encoding: chunked" CRLF) - 1;
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302 }
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303
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304 if (r->keepalive) {
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305 len += sizeof("Connection: keep-alive" CRLF) - 1;
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306
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307 /*
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308 * MSIE and Opera ignore the "Keep-Alive: timeout=<N>" header.
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309 * MSIE keeps the connection alive for about 60-65 seconds.
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310 * Opera keeps the connection alive very long.
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311 * Mozilla keeps the connection alive for N plus about 1-10 seconds.
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312 * Konqueror keeps the connection alive for about N seconds.
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313 */
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314
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315 if (clcf->keepalive_header) {
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316 len += sizeof("Keep-Alive: timeout=") - 1 + NGX_TIME_T_LEN + 2;
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317 }
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318
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319 } else {
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320 len += sizeof("Connection: closed" CRLF) - 1;
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321 }
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322
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323 part = &r->headers_out.headers.part;
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324 header = part->elts;
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325
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326 for (i = 0; /* void */; i++) {
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327
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328 if (i >= part->nelts) {
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329 if (part->next == NULL) {
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330 break;
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331 }
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332
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333 part = part->next;
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334 header = part->elts;
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335 i = 0;
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336 }
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337
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338 if (header[i].hash == 0) {
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339 continue;
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340 }
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341
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342 len += header[i].key.len + sizeof(": ") - 1 + header[i].value.len
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343 + sizeof(CRLF) - 1;
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344 }
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345
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346 b = ngx_create_temp_buf(r->pool, len);
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347 if (b == NULL) {
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348 return NGX_ERROR;
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349 }
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350
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351 /* "HTTP/1.x " */
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352 b->last = ngx_cpymem(b->last, "HTTP/1.1 ", sizeof("HTTP/1.x ") - 1);
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353
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354 /* status line */
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355 if (r->headers_out.status_line.len) {
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122
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356 b->last = ngx_copy(b->last, r->headers_out.status_line.data,
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357 r->headers_out.status_line.len);
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50
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358
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359 } else {
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122
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360 b->last = ngx_copy(b->last, ngx_http_status_lines[status].data,
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361 ngx_http_status_lines[status].len);
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50
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362 }
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363 *b->last++ = CR; *b->last++ = LF;
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364
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58
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365 if (r->headers_out.server == NULL) {
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366 b->last = ngx_cpymem(b->last, ngx_http_server_string,
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367 sizeof(ngx_http_server_string) - 1);
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50
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368 }
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369
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58
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370 if (r->headers_out.date == NULL) {
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371 b->last = ngx_cpymem(b->last, "Date: ", sizeof("Date: ") - 1);
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372 b->last = ngx_cpymem(b->last, ngx_cached_http_time.data,
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373 ngx_cached_http_time.len);
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374
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375 *b->last++ = CR; *b->last++ = LF;
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376 }
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377
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58
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378 if (r->headers_out.content_type.len) {
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50
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379 b->last = ngx_cpymem(b->last, "Content-Type: ",
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380 sizeof("Content-Type: ") - 1);
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381 p = b->last;
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122
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382 b->last = ngx_copy(b->last, r->headers_out.content_type.data,
|
|
|
383 r->headers_out.content_type.len);
|
|
50
|
384
|
|
206
|
385 if (r->headers_out.content_type_len == r->headers_out.content_type.len
|
|
|
386 && r->headers_out.charset.len)
|
|
|
387 {
|
|
50
|
388 b->last = ngx_cpymem(b->last, "; charset=",
|
|
|
389 sizeof("; charset=") - 1);
|
|
122
|
390 b->last = ngx_copy(b->last, r->headers_out.charset.data,
|
|
|
391 r->headers_out.charset.len);
|
|
50
|
392
|
|
58
|
393 /* update r->headers_out.content_type for possible logging */
|
|
|
394
|
|
|
395 r->headers_out.content_type.len = b->last - p;
|
|
|
396 r->headers_out.content_type.data = p;
|
|
50
|
397 }
|
|
|
398
|
|
|
399 *b->last++ = CR; *b->last++ = LF;
|
|
|
400 }
|
|
|
401
|
|
58
|
402 if (r->headers_out.content_length == NULL
|
|
|
403 && r->headers_out.content_length_n >= 0)
|
|
|
404 {
|
|
|
405 b->last = ngx_sprintf(b->last, "Content-Length: %O" CRLF,
|
|
|
406 r->headers_out.content_length_n);
|
|
|
407 }
|
|
|
408
|
|
|
409 if (r->headers_out.last_modified == NULL
|
|
|
410 && r->headers_out.last_modified_time != -1)
|
|
|
411 {
|
|
|
412 b->last = ngx_cpymem(b->last, "Last-Modified: ",
|
|
|
413 sizeof("Last-Modified: ") - 1);
|
|
|
414 b->last = ngx_http_time(b->last, r->headers_out.last_modified_time);
|
|
|
415
|
|
|
416 *b->last++ = CR; *b->last++ = LF;
|
|
|
417 }
|
|
|
418
|
|
50
|
419 if (r->headers_out.location
|
|
|
420 && r->headers_out.location->value.len
|
|
|
421 && r->headers_out.location->value.data[0] == '/')
|
|
|
422 {
|
|
|
423 p = b->last + sizeof("Location: ") - 1;
|
|
66
|
424
|
|
|
425 b->last = ngx_cpymem(b->last, "Location: http",
|
|
|
426 sizeof("Location: http") - 1);
|
|
|
427
|
|
|
428 #if (NGX_HTTP_SSL)
|
|
|
429 if (r->connection->ssl) {
|
|
|
430 *b->last++ ='s';
|
|
|
431 }
|
|
|
432 #endif
|
|
|
433
|
|
|
434 *b->last++ = ':'; *b->last++ = '/'; *b->last++ = '/';
|
|
122
|
435 b->last = ngx_copy(b->last, r->server_name.data, r->server_name.len);
|
|
66
|
436
|
|
70
|
437 if (clcf->port_in_redirect) {
|
|
66
|
438 #if (NGX_HTTP_SSL)
|
|
70
|
439 if (r->connection->ssl) {
|
|
|
440 if (r->port != 443) {
|
|
122
|
441 b->last = ngx_copy(b->last, r->port_text->data,
|
|
|
442 r->port_text->len);
|
|
70
|
443 }
|
|
|
444 } else
|
|
66
|
445 #endif
|
|
70
|
446 {
|
|
|
447 if (r->port != 80) {
|
|
122
|
448 b->last = ngx_copy(b->last, r->port_text->data,
|
|
|
449 r->port_text->len);
|
|
70
|
450 }
|
|
66
|
451 }
|
|
50
|
452 }
|
|
|
453
|
|
122
|
454 b->last = ngx_copy(b->last, r->headers_out.location->value.data,
|
|
|
455 r->headers_out.location->value.len);
|
|
50
|
456
|
|
58
|
457 /* update r->headers_out.location->value for possible logging */
|
|
|
458
|
|
50
|
459 r->headers_out.location->value.len = b->last - p;
|
|
|
460 r->headers_out.location->value.data = p;
|
|
|
461
|
|
|
462 *b->last++ = CR; *b->last++ = LF;
|
|
|
463 }
|
|
|
464
|
|
|
465 if (r->chunked) {
|
|
|
466 b->last = ngx_cpymem(b->last, "Transfer-Encoding: chunked" CRLF,
|
|
|
467 sizeof("Transfer-Encoding: chunked" CRLF) - 1);
|
|
|
468 }
|
|
|
469
|
|
|
470 if (r->keepalive) {
|
|
|
471 b->last = ngx_cpymem(b->last, "Connection: keep-alive" CRLF,
|
|
|
472 sizeof("Connection: keep-alive" CRLF) - 1);
|
|
|
473
|
|
|
474 if (clcf->keepalive_header) {
|
|
|
475 b->last = ngx_sprintf(b->last, "Keep-Alive: timeout=%T" CRLF,
|
|
|
476 clcf->keepalive_header);
|
|
|
477 }
|
|
|
478
|
|
|
479 } else {
|
|
|
480 b->last = ngx_cpymem(b->last, "Connection: close" CRLF,
|
|
|
481 sizeof("Connection: close" CRLF) - 1);
|
|
|
482 }
|
|
|
483
|
|
|
484 part = &r->headers_out.headers.part;
|
|
|
485 header = part->elts;
|
|
|
486
|
|
|
487 for (i = 0; /* void */; i++) {
|
|
|
488
|
|
|
489 if (i >= part->nelts) {
|
|
|
490 if (part->next == NULL) {
|
|
|
491 break;
|
|
|
492 }
|
|
|
493
|
|
|
494 part = part->next;
|
|
|
495 header = part->elts;
|
|
|
496 i = 0;
|
|
|
497 }
|
|
|
498
|
|
58
|
499 if (header[i].hash == 0) {
|
|
50
|
500 continue;
|
|
|
501 }
|
|
|
502
|
|
122
|
503 b->last = ngx_copy(b->last, header[i].key.data, header[i].key.len);
|
|
50
|
504 *b->last++ = ':' ; *b->last++ = ' ' ;
|
|
|
505
|
|
122
|
506 b->last = ngx_copy(b->last, header[i].value.data, header[i].value.len);
|
|
50
|
507 *b->last++ = CR; *b->last++ = LF;
|
|
|
508 }
|
|
|
509
|
|
|
510 #if (NGX_DEBUG)
|
|
|
511 *b->last = '\0';
|
|
|
512 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "%s\n", b->pos);
|
|
|
513 #endif
|
|
|
514
|
|
|
515 /* the end of HTTP header */
|
|
|
516 *b->last++ = CR; *b->last++ = LF;
|
|
|
517
|
|
|
518 r->header_size = b->last - b->pos;
|
|
|
519
|
|
|
520 if (r->header_only) {
|
|
|
521 b->last_buf = 1;
|
|
|
522 }
|
|
|
523
|
|
|
524 out.buf = b;
|
|
|
525 out.next = NULL;
|
|
|
526
|
|
|
527 return ngx_http_write_filter(r, &out);
|
|
|
528 }
|
|
|
529
|
|
|
530
|
|
|
531 static ngx_int_t
|
|
|
532 ngx_http_header_filter_init(ngx_cycle_t *cycle)
|
|
|
533 {
|
|
|
534 ngx_http_top_header_filter = ngx_http_header_filter;
|
|
|
535
|
|
|
536 return NGX_OK;
|
|
|
537 }
|
