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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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18 NULL, /* preconfiguration */
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19 NULL, /* postconfiguration */
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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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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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37 ngx_http_header_filter_init, /* init module */
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38 NULL /* init process */
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39 };
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40
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41
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58
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42 static char ngx_http_server_string[] = "Server: " NGINX_VER CRLF;
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43
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44
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45 static ngx_str_t ngx_http_status_lines[] = {
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46
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47 ngx_string("200 OK"),
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48 ngx_null_string, /* "201 Created" */
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49 ngx_null_string, /* "202 Accepted" */
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50 ngx_null_string, /* "203 Non-Authoritative Information" */
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60
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51 ngx_string("204 No Content"),
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52 ngx_null_string, /* "205 Reset Content" */
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53 ngx_string("206 Partial Content"),
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54
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55 /* ngx_null_string, */ /* "207 Multi-Status" */
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56
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57 #define NGX_HTTP_LEVEL_200 7
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58
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59 /* ngx_null_string, */ /* "300 Multiple Choices" */
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60
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61 ngx_string("301 Moved Permanently"),
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62 ngx_string("302 Moved Temporarily"),
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63 ngx_null_string, /* "303 See Other" */
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64 ngx_string("304 Not Modified"),
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65
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66 /* ngx_null_string, */ /* "305 Use Proxy" */
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67 /* ngx_null_string, */ /* "306 unused" */
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68 /* ngx_null_string, */ /* "307 Temporary Redirect" */
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69
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70 #define NGX_HTTP_LEVEL_300 4
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71
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72 ngx_string("400 Bad Request"),
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73 ngx_string("401 Unauthorized"),
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74 ngx_string("402 Payment Required"),
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75 ngx_string("403 Forbidden"),
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76 ngx_string("404 Not Found"),
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77 ngx_string("405 Not Allowed"),
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78 ngx_string("406 Not Acceptable"),
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79 ngx_null_string, /* "407 Proxy Authentication Required" */
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80 ngx_string("408 Request Time-out"),
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81 ngx_null_string, /* "409 Conflict" */
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82 ngx_string("410 Gone"),
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83 ngx_string("411 Length Required"),
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84 ngx_null_string, /* "412 Precondition Failed" */
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85 ngx_string("413 Request Entity Too Large"),
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86 ngx_null_string, /* "414 Request-URI Too Large", but we never send it
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87 * because we treat such requests as the HTTP/0.9
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88 * requests and send only a body without a header
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89 */
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90 ngx_null_string, /* "415 Unsupported Media Type" */
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91 ngx_string("416 Requested Range Not Satisfiable"),
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92
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93 /* ngx_null_string, */ /* "417 Expectation Failed" */
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94 /* ngx_null_string, */ /* "418 unused" */
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95 /* ngx_null_string, */ /* "419 unused" */
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96 /* ngx_null_string, */ /* "420 unused" */
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97 /* ngx_null_string, */ /* "421 unused" */
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98 /* ngx_null_string, */ /* "422 Unprocessable Entity" */
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99 /* ngx_null_string, */ /* "423 Locked" */
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100 /* ngx_null_string, */ /* "424 Failed Dependency" */
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101
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102 #define NGX_HTTP_LEVEL_400 17
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103
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104 ngx_string("500 Internal Server Error"),
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105 ngx_string("501 Method Not Implemented"),
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106 ngx_string("502 Bad Gateway"),
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107 ngx_string("503 Service Temporarily Unavailable"),
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108 ngx_string("504 Gateway Time-out")
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109
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110 /* ngx_null_string, */ /* "505 HTTP Version Not Supported" */
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111 /* ngx_null_string, */ /* "506 Variant Also Negotiates" */
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112 /* ngx_null_string, */ /* "507 Insufficient Storage" */
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113 /* ngx_null_string, */ /* "508 unused" */
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114 /* ngx_null_string, */ /* "509 unused" */
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115 /* ngx_null_string, */ /* "510 Not Extended" */
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116 };
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117
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118
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119 ngx_http_header0_t ngx_http_headers_out[] = {
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120 { ngx_string("Server"), offsetof(ngx_http_headers_out_t, server) },
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121 { ngx_string("Date"), offsetof(ngx_http_headers_out_t, date) },
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58
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122 #if 0
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123 { ngx_string("Content-Type"),
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124 offsetof(ngx_http_headers_out_t, content_type) },
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125 #endif
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126 { ngx_string("Content-Length"),
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127 offsetof(ngx_http_headers_out_t, content_length) },
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128 { ngx_string("Content-Encoding"),
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129 offsetof(ngx_http_headers_out_t, content_encoding) },
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130 { ngx_string("Location"), offsetof(ngx_http_headers_out_t, location) },
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131 { ngx_string("Last-Modified"),
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132 offsetof(ngx_http_headers_out_t, last_modified) },
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133 { ngx_string("Accept-Ranges"),
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134 offsetof(ngx_http_headers_out_t, accept_ranges) },
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135 { ngx_string("Expires"), offsetof(ngx_http_headers_out_t, expires) },
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136 { ngx_string("Cache-Control"),
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137 offsetof(ngx_http_headers_out_t, cache_control) },
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138 { ngx_string("ETag"), offsetof(ngx_http_headers_out_t, etag) },
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139
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140 { ngx_null_string, 0 }
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141 };
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142
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143
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144 static ngx_int_t
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145 ngx_http_header_filter(ngx_http_request_t *r)
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146 {
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147 u_char *p;
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148 size_t len;
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149 ngx_uint_t status, i;
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150 ngx_buf_t *b;
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151 ngx_chain_t out;
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152 ngx_list_part_t *part;
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153 ngx_table_elt_t *header;
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154 ngx_http_core_loc_conf_t *clcf;
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155
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156 if (r->main) {
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157 return NGX_OK;
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158 }
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159
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160 if (r->http_version < NGX_HTTP_VERSION_10) {
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161 return NGX_OK;
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162 }
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163
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164 if (r->method == NGX_HTTP_HEAD) {
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165 r->header_only = 1;
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166 }
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167
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168 if (r->headers_out.last_modified_time != -1) {
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169 if (r->headers_out.status != NGX_HTTP_OK
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170 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
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171 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED)
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172 {
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173 r->headers_out.last_modified_time = -1;
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174 r->headers_out.last_modified = NULL;
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175 }
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176 }
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177
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178 len = sizeof("HTTP/1.x ") - 1 + sizeof(CRLF) - 1
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179 /* the end of the header */
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180 + sizeof(CRLF) - 1;
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181
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182 /* status line */
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183
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184 if (r->headers_out.status_line.len) {
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185 len += r->headers_out.status_line.len;
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186 #if (NGX_SUPPRESS_WARN)
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187 status = NGX_INVALID_ARRAY_INDEX;
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188 #endif
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189
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190 } else {
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191
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192 if (r->headers_out.status < NGX_HTTP_MOVED_PERMANENTLY) {
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193 /* 2XX */
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194 status = r->headers_out.status - NGX_HTTP_OK;
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195
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196 if (r->headers_out.status == NGX_HTTP_NO_CONTENT) {
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197 r->header_only = 1;
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198 r->headers_out.content_type.len = 0;
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199 r->headers_out.content_type.data = NULL;
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200 r->headers_out.last_modified_time = -1;
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201 r->headers_out.last_modified = NULL;
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202 r->headers_out.content_length = NULL;
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203 r->headers_out.content_length_n = -1;
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204 }
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205
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206 } else if (r->headers_out.status < NGX_HTTP_BAD_REQUEST) {
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207 /* 3XX */
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208 status = r->headers_out.status - NGX_HTTP_MOVED_PERMANENTLY
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209 + NGX_HTTP_LEVEL_200;
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210
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211 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) {
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212 r->header_only = 1;
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213 }
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214
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215 } else if (r->headers_out.status < NGX_HTTP_INTERNAL_SERVER_ERROR) {
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216 /* 4XX */
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217 status = r->headers_out.status - NGX_HTTP_BAD_REQUEST
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218 + NGX_HTTP_LEVEL_200
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219 + NGX_HTTP_LEVEL_300;
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220
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221 } else {
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222 /* 5XX */
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223 status = r->headers_out.status - NGX_HTTP_INTERNAL_SERVER_ERROR
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224 + NGX_HTTP_LEVEL_200
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225 + NGX_HTTP_LEVEL_300
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226 + NGX_HTTP_LEVEL_400;
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227 }
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228
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229 len += ngx_http_status_lines[status].len;
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230 }
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231
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232 if (r->headers_out.server == NULL) {
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233 len += sizeof(ngx_http_server_string) - 1;
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234 }
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235
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236 if (r->headers_out.date == NULL) {
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237 len += sizeof("Date: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
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238 }
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239
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240 if (r->headers_out.content_type.len) {
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241 len += sizeof("Content-Type: ") - 1
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242 + r->headers_out.content_type.len + 2;
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243
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244 if (r->headers_out.charset.len) {
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245 len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
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246 }
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247 }
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248
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249 if (r->headers_out.content_length == NULL
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250 && r->headers_out.content_length_n >= 0)
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251 {
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252 len += sizeof("Content-Length: ") - 1 + NGX_OFF_T_LEN + 2;
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253 }
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254
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255 if (r->headers_out.last_modified == NULL
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256 && r->headers_out.last_modified_time != -1)
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257 {
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258 len += sizeof("Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
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259 }
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260
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261 if (r->headers_out.location
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262 && r->headers_out.location->value.len
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263 && r->headers_out.location->value.data[0] == '/')
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264 {
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265 r->headers_out.location->hash = 0;
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266
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66
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267 #if (NGX_HTTP_SSL)
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268 if (r->connection->ssl) {
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269 len += sizeof("Location: https://") - 1
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270 + r->server_name.len
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271 + r->headers_out.location->value.len + 2;
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272
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273 if (r->port != 443) {
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274 len += r->port_text->len;
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275 }
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276
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66
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277 } else
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278 #endif
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279 {
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280 len += sizeof("Location: http://") - 1
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281 + r->server_name.len
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282 + r->headers_out.location->value.len + 2;
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283
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284 if (r->port != 80) {
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285 len += r->port_text->len;
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286 }
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287 }
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288 }
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289
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290 if (r->chunked) {
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291 len += sizeof("Transfer-Encoding: chunked" CRLF) - 1;
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292 }
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293
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294 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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295
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296 if (r->keepalive) {
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297 len += sizeof("Connection: keep-alive" CRLF) - 1;
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298
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299 /*
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300 * MSIE and Opera ignore the "Keep-Alive: timeout=<N>" header.
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301 * MSIE keeps the connection alive for about 60-65 seconds.
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302 * Opera keeps the connection alive very long.
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303 * Mozilla keeps the connection alive for N plus about 1-10 seconds.
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304 * Konqueror keeps the connection alive for about N seconds.
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305 */
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306
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307 if (clcf->keepalive_header) {
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308 len += sizeof("Keep-Alive: timeout=") - 1 + NGX_TIME_T_LEN + 2;
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309 }
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310
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311 } else {
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312 len += sizeof("Connection: closed" CRLF) - 1;
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313 }
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314
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315 part = &r->headers_out.headers.part;
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316 header = part->elts;
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317
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318 for (i = 0; /* void */; i++) {
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319
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320 if (i >= part->nelts) {
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321 if (part->next == NULL) {
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322 break;
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323 }
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324
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325 part = part->next;
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326 header = part->elts;
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327 i = 0;
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328 }
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329
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330 if (header[i].hash == 0) {
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331 continue;
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332 }
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333
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334 len += header[i].key.len + sizeof(": ") - 1 + header[i].value.len
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335 + sizeof(CRLF) - 1;
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336 }
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337
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338 b = ngx_create_temp_buf(r->pool, len);
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339 if (b == NULL) {
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340 return NGX_ERROR;
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341 }
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342
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343 /* "HTTP/1.x " */
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344 b->last = ngx_cpymem(b->last, "HTTP/1.1 ", sizeof("HTTP/1.x ") - 1);
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345
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346 /* status line */
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347 if (r->headers_out.status_line.len) {
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348 b->last = ngx_cpymem(b->last, r->headers_out.status_line.data,
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349 r->headers_out.status_line.len);
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350
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351 } else {
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58
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352 b->last = ngx_cpymem(b->last, ngx_http_status_lines[status].data,
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353 ngx_http_status_lines[status].len);
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50
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354 }
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355 *b->last++ = CR; *b->last++ = LF;
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356
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58
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357 if (r->headers_out.server == NULL) {
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358 b->last = ngx_cpymem(b->last, ngx_http_server_string,
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359 sizeof(ngx_http_server_string) - 1);
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360 }
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361
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58
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362 if (r->headers_out.date == NULL) {
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363 b->last = ngx_cpymem(b->last, "Date: ", sizeof("Date: ") - 1);
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364 b->last = ngx_cpymem(b->last, ngx_cached_http_time.data,
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365 ngx_cached_http_time.len);
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366
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367 *b->last++ = CR; *b->last++ = LF;
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368 }
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369
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58
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370 if (r->headers_out.content_type.len) {
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371 b->last = ngx_cpymem(b->last, "Content-Type: ",
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372 sizeof("Content-Type: ") - 1);
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373 p = b->last;
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58
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374 b->last = ngx_cpymem(b->last, r->headers_out.content_type.data,
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375 r->headers_out.content_type.len);
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50
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376
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377 if (r->headers_out.charset.len) {
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378 b->last = ngx_cpymem(b->last, "; charset=",
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379 sizeof("; charset=") - 1);
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380 b->last = ngx_cpymem(b->last, r->headers_out.charset.data,
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381 r->headers_out.charset.len);
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382
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58
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383 /* update r->headers_out.content_type for possible logging */
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384
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|
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385 r->headers_out.content_type.len = b->last - p;
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|
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386 r->headers_out.content_type.data = p;
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50
|
387 }
|
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388
|
|
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389 *b->last++ = CR; *b->last++ = LF;
|
|
|
390 }
|
|
|
391
|
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58
|
392 if (r->headers_out.content_length == NULL
|
|
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393 && r->headers_out.content_length_n >= 0)
|
|
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394 {
|
|
|
395 b->last = ngx_sprintf(b->last, "Content-Length: %O" CRLF,
|
|
|
396 r->headers_out.content_length_n);
|
|
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397 }
|
|
|
398
|
|
|
399 if (r->headers_out.last_modified == NULL
|
|
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400 && r->headers_out.last_modified_time != -1)
|
|
|
401 {
|
|
|
402 b->last = ngx_cpymem(b->last, "Last-Modified: ",
|
|
|
403 sizeof("Last-Modified: ") - 1);
|
|
|
404 b->last = ngx_http_time(b->last, r->headers_out.last_modified_time);
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|
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405
|
|
|
406 *b->last++ = CR; *b->last++ = LF;
|
|
|
407 }
|
|
|
408
|
|
50
|
409 if (r->headers_out.location
|
|
|
410 && r->headers_out.location->value.len
|
|
|
411 && r->headers_out.location->value.data[0] == '/')
|
|
|
412 {
|
|
|
413 p = b->last + sizeof("Location: ") - 1;
|
|
66
|
414
|
|
|
415 b->last = ngx_cpymem(b->last, "Location: http",
|
|
|
416 sizeof("Location: http") - 1);
|
|
|
417
|
|
|
418 #if (NGX_HTTP_SSL)
|
|
|
419 if (r->connection->ssl) {
|
|
|
420 *b->last++ ='s';
|
|
|
421 }
|
|
|
422 #endif
|
|
|
423
|
|
|
424 *b->last++ = ':'; *b->last++ = '/'; *b->last++ = '/';
|
|
50
|
425 b->last = ngx_cpymem(b->last, r->server_name.data,
|
|
|
426 r->server_name.len);
|
|
66
|
427
|
|
|
428 #if (NGX_HTTP_SSL)
|
|
|
429 if (r->connection->ssl) {
|
|
|
430 if (r->port != 443) {
|
|
|
431 b->last = ngx_cpymem(b->last, r->port_text->data,
|
|
|
432 r->port_text->len);
|
|
|
433 }
|
|
|
434 } else
|
|
|
435 #endif
|
|
|
436 {
|
|
|
437 if (r->port != 80) {
|
|
|
438 b->last = ngx_cpymem(b->last, r->port_text->data,
|
|
|
439 r->port_text->len);
|
|
|
440 }
|
|
50
|
441 }
|
|
|
442
|
|
|
443 b->last = ngx_cpymem(b->last, r->headers_out.location->value.data,
|
|
|
444 r->headers_out.location->value.len);
|
|
|
445
|
|
58
|
446 /* update r->headers_out.location->value for possible logging */
|
|
|
447
|
|
50
|
448 r->headers_out.location->value.len = b->last - p;
|
|
|
449 r->headers_out.location->value.data = p;
|
|
|
450
|
|
|
451 *b->last++ = CR; *b->last++ = LF;
|
|
|
452 }
|
|
|
453
|
|
|
454 if (r->chunked) {
|
|
|
455 b->last = ngx_cpymem(b->last, "Transfer-Encoding: chunked" CRLF,
|
|
|
456 sizeof("Transfer-Encoding: chunked" CRLF) - 1);
|
|
|
457 }
|
|
|
458
|
|
|
459 if (r->keepalive) {
|
|
|
460 b->last = ngx_cpymem(b->last, "Connection: keep-alive" CRLF,
|
|
|
461 sizeof("Connection: keep-alive" CRLF) - 1);
|
|
|
462
|
|
|
463 if (clcf->keepalive_header) {
|
|
|
464 b->last = ngx_sprintf(b->last, "Keep-Alive: timeout=%T" CRLF,
|
|
|
465 clcf->keepalive_header);
|
|
|
466 }
|
|
|
467
|
|
|
468 } else {
|
|
|
469 b->last = ngx_cpymem(b->last, "Connection: close" CRLF,
|
|
|
470 sizeof("Connection: close" CRLF) - 1);
|
|
|
471 }
|
|
|
472
|
|
|
473 part = &r->headers_out.headers.part;
|
|
|
474 header = part->elts;
|
|
|
475
|
|
|
476 for (i = 0; /* void */; i++) {
|
|
|
477
|
|
|
478 if (i >= part->nelts) {
|
|
|
479 if (part->next == NULL) {
|
|
|
480 break;
|
|
|
481 }
|
|
|
482
|
|
|
483 part = part->next;
|
|
|
484 header = part->elts;
|
|
|
485 i = 0;
|
|
|
486 }
|
|
|
487
|
|
58
|
488 if (header[i].hash == 0) {
|
|
50
|
489 continue;
|
|
|
490 }
|
|
|
491
|
|
|
492 b->last = ngx_cpymem(b->last, header[i].key.data, header[i].key.len);
|
|
|
493 *b->last++ = ':' ; *b->last++ = ' ' ;
|
|
|
494
|
|
|
495 b->last = ngx_cpymem(b->last, header[i].value.data,
|
|
|
496 header[i].value.len);
|
|
|
497 *b->last++ = CR; *b->last++ = LF;
|
|
|
498 }
|
|
|
499
|
|
|
500 #if (NGX_DEBUG)
|
|
|
501 *b->last = '\0';
|
|
|
502 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "%s\n", b->pos);
|
|
|
503 #endif
|
|
|
504
|
|
|
505 /* the end of HTTP header */
|
|
|
506 *b->last++ = CR; *b->last++ = LF;
|
|
|
507
|
|
|
508 r->header_size = b->last - b->pos;
|
|
|
509
|
|
|
510 if (r->header_only) {
|
|
|
511 b->last_buf = 1;
|
|
|
512 }
|
|
|
513
|
|
|
514 out.buf = b;
|
|
|
515 out.next = NULL;
|
|
|
516
|
|
|
517 return ngx_http_write_filter(r, &out);
|
|
|
518 }
|
|
|
519
|
|
|
520
|
|
|
521 static ngx_int_t
|
|
|
522 ngx_http_header_filter_init(ngx_cycle_t *cycle)
|
|
|
523 {
|
|
|
524 ngx_http_top_header_filter = ngx_http_header_filter;
|
|
|
525
|
|
|
526 return NGX_OK;
|
|
|
527 }
|
