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0
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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, /* pre conf */
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19
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20 NULL, /* create main configuration */
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21 NULL, /* init main configuration */
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22
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23 NULL, /* create server configuration */
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24 NULL, /* merge server configuration */
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25
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26 NULL, /* create location configuration */
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27 NULL, /* merge location configuration */
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28 };
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29
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30
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31 ngx_module_t ngx_http_header_filter_module = {
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32 NGX_MODULE,
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33 &ngx_http_header_filter_module_ctx, /* module context */
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34 NULL, /* module directives */
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35 NGX_HTTP_MODULE, /* module type */
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36 ngx_http_header_filter_init, /* init module */
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48
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37 NULL /* init process */
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0
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38 };
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39
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40
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41 static char server_string[] = "Server: " NGINX_VER CRLF;
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42
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43
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44 static ngx_str_t http_codes[] = {
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45
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46 ngx_string("200 OK"),
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47 ngx_null_string, /* "201 Created" */
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48 ngx_null_string, /* "202 Accepted" */
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49 ngx_null_string, /* "203 Non-Authoritative Information" */
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50 ngx_null_string, /* "204 No Content" */
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51 ngx_null_string, /* "205 Reset Content" */
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52 ngx_string("206 Partial Content"),
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48
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53
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54 /* ngx_null_string, */ /* "207 Multi-Status" */
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0
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55
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48
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56 #define NGX_HTTP_LEVEL_200 7
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57
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58 /* ngx_null_string, */ /* "300 Multiple Choices" */
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0
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59
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60 ngx_string("301 Moved Permanently"),
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61 ngx_string("302 Moved Temporarily"),
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62 ngx_null_string, /* "303 See Other" */
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63 ngx_string("304 Not Modified"),
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64
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48
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65 /* ngx_null_string, */ /* "305 Use Proxy" */
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66 /* ngx_null_string, */ /* "306 unused" */
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67 /* ngx_null_string, */ /* "307 Temporary Redirect" */
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68
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69 #define NGX_HTTP_LEVEL_300 4
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70
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0
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71 ngx_string("400 Bad Request"),
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72 ngx_string("401 Unauthorized"),
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48
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73 ngx_string("402 Payment Required"),
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0
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74 ngx_string("403 Forbidden"),
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75 ngx_string("404 Not Found"),
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76 ngx_string("405 Not Allowed"),
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48
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77 ngx_string("406 Not Acceptable"),
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0
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78 ngx_null_string, /* "407 Proxy Authentication Required" */
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79 ngx_string("408 Request Time-out"),
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80 ngx_null_string, /* "409 Conflict" */
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48
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81 ngx_string("410 Gone"),
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0
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82 ngx_string("411 Length Required"),
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83 ngx_null_string, /* "412 Precondition Failed" */
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84 ngx_string("413 Request Entity Too Large"),
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48
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85 ngx_null_string, /* "414 Request-URI Too Large", but we never send it
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0
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86 * because we treat such requests as the HTTP/0.9
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87 * requests and send only a body without a header
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88 */
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89 ngx_null_string, /* "415 Unsupported Media Type" */
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90 ngx_string("416 Requested Range Not Satisfiable"),
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91
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48
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92 /* ngx_null_string, */ /* "417 Expectation Failed" */
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93 /* ngx_null_string, */ /* "418 unused" */
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94 /* ngx_null_string, */ /* "419 unused" */
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95 /* ngx_null_string, */ /* "420 unused" */
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96 /* ngx_null_string, */ /* "421 unused" */
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97 /* ngx_null_string, */ /* "422 Unprocessable Entity" */
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98 /* ngx_null_string, */ /* "423 Locked" */
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99 /* ngx_null_string, */ /* "424 Failed Dependency" */
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100
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101 #define NGX_HTTP_LEVEL_400 17
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102
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0
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103 ngx_string("500 Internal Server Error"),
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104 ngx_string("501 Method Not Implemented"),
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105 ngx_string("502 Bad Gateway"),
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106 ngx_string("503 Service Temporarily Unavailable"),
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107 ngx_string("504 Gateway Time-out")
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48
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108
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109 /* ngx_null_string, */ /* "505 HTTP Version Not Supported" */
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110 /* ngx_null_string, */ /* "506 Variant Also Negotiates" */
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111 /* ngx_null_string, */ /* "507 Insufficient Storage" */
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112 /* ngx_null_string, */ /* "508 unused" */
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113 /* ngx_null_string, */ /* "509 unused" */
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114 /* ngx_null_string, */ /* "510 Not Extended" */
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0
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115 };
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116
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117
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118 ngx_http_header_t ngx_http_headers_out[] = {
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119 { ngx_string("Server"), offsetof(ngx_http_headers_out_t, server) },
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120 { ngx_string("Date"), offsetof(ngx_http_headers_out_t, date) },
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121 { ngx_string("Content-Type"),
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48
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122 offsetof(ngx_http_headers_out_t, content_type) },
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0
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123 { ngx_string("Content-Length"),
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48
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124 offsetof(ngx_http_headers_out_t, content_length) },
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0
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125 { ngx_string("Content-Encoding"),
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48
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126 offsetof(ngx_http_headers_out_t, content_encoding) },
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0
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127 { ngx_string("Location"), offsetof(ngx_http_headers_out_t, location) },
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128 { ngx_string("Last-Modified"),
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48
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129 offsetof(ngx_http_headers_out_t, last_modified) },
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0
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130 { ngx_string("Accept-Ranges"),
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48
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131 offsetof(ngx_http_headers_out_t, accept_ranges) },
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0
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132 { ngx_string("Expires"), offsetof(ngx_http_headers_out_t, expires) },
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133 { ngx_string("Cache-Control"),
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48
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134 offsetof(ngx_http_headers_out_t, cache_control) },
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0
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135 { ngx_string("ETag"), offsetof(ngx_http_headers_out_t, etag) },
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136
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137 { ngx_null_string, 0 }
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138 };
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139
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140
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42
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141 static ngx_int_t
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142 ngx_http_header_filter(ngx_http_request_t *r)
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0
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143 {
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144 u_char *p;
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145 size_t len;
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146 ngx_uint_t status, i;
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147 ngx_buf_t *b;
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148 ngx_chain_t *ln;
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149 ngx_list_part_t *part;
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150 ngx_table_elt_t *header;
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151 ngx_http_core_loc_conf_t *clcf;
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152
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153 if (r->http_version < NGX_HTTP_VERSION_10) {
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154 return NGX_OK;
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155 }
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156
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157 if (r->method == NGX_HTTP_HEAD) {
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158 r->header_only = 1;
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159 }
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160
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161 if (r->headers_out.last_modified_time != -1) {
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162 if (r->headers_out.status != NGX_HTTP_OK
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163 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED
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164 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT)
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165 {
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166 r->headers_out.last_modified_time = -1;
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167 r->headers_out.last_modified = NULL;
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168 }
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169 }
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170
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42
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171 len = sizeof("HTTP/1.x ") - 1 + sizeof(CRLF) - 1
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172 /* the end of the header */
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173 + sizeof(CRLF) - 1;
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0
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174
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175 /* status line */
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2
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176
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0
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177 if (r->headers_out.status_line.len) {
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178 len += r->headers_out.status_line.len;
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179 #if (NGX_SUPPRESS_WARN)
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180 status = NGX_INVALID_ARRAY_INDEX;
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181 #endif
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182
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183 } else {
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184
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185 if (r->headers_out.status < NGX_HTTP_MOVED_PERMANENTLY) {
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186 /* 2XX */
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187 status = r->headers_out.status - NGX_HTTP_OK;
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188
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189 } else if (r->headers_out.status < NGX_HTTP_BAD_REQUEST) {
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190 /* 3XX */
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48
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191 status = r->headers_out.status - NGX_HTTP_MOVED_PERMANENTLY
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192 + NGX_HTTP_LEVEL_200;
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0
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193
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194 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) {
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195 r->header_only = 1;
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196 }
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197
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198 } else if (r->headers_out.status < NGX_HTTP_INTERNAL_SERVER_ERROR) {
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199 /* 4XX */
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48
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200 status = r->headers_out.status - NGX_HTTP_BAD_REQUEST
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201 + NGX_HTTP_LEVEL_200
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202 + NGX_HTTP_LEVEL_300;
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0
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203
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204 } else {
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205 /* 5XX */
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48
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206 status = r->headers_out.status - NGX_HTTP_INTERNAL_SERVER_ERROR
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207 + NGX_HTTP_LEVEL_200
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208 + NGX_HTTP_LEVEL_300
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209 + NGX_HTTP_LEVEL_400;
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0
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210 }
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211
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212 len += http_codes[status].len;
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213 }
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214
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215 if (r->headers_out.server && r->headers_out.server->key.len) {
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216 len += r->headers_out.server->key.len
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217 + r->headers_out.server->value.len + 2;
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218 } else {
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219 len += sizeof(server_string) - 1;
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220 }
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221
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222 if (r->headers_out.date && r->headers_out.date->key.len) {
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223 len += r->headers_out.date->key.len
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224 + r->headers_out.date->value.len + 2;
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225 } else {
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226 len += sizeof("Date: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
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227 }
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228
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229 if (r->headers_out.content_length == NULL) {
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230 if (r->headers_out.content_length_n >= 0) {
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231 len += sizeof("Content-Length: ") - 1 + NGX_OFF_T_LEN + 2;
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232 }
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233 }
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234
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235 if (r->headers_out.content_type && r->headers_out.content_type->value.len) {
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236 r->headers_out.content_type->key.len = 0;
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237 len += sizeof("Content-Type: ") - 1
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238 + r->headers_out.content_type->value.len + 2;
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239
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240 if (r->headers_out.charset.len) {
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241 len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
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242 }
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243 }
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244
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245 if (r->headers_out.location
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246 && r->headers_out.location->value.len
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247 && r->headers_out.location->value.data[0] == '/')
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248 {
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249 r->headers_out.location->key.len = 0;
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250 len += sizeof("Location: http://") - 1
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6
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251 + r->server_name.len + r->headers_out.location->value.len + 2;
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0
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252
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253 if (r->port != 80) {
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254 len += r->port_text->len;
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255 }
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256 }
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257
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258 if (r->headers_out.last_modified && r->headers_out.last_modified->key.len) {
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259 len += r->headers_out.last_modified->key.len
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260 + r->headers_out.last_modified->value.len + 2;
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261
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262 } else if (r->headers_out.last_modified_time != -1) {
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263 len += sizeof("Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
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264 }
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265
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266 if (r->chunked) {
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267 len += sizeof("Transfer-Encoding: chunked" CRLF) - 1;
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268 }
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269
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270 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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271
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272 if (r->keepalive) {
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273 len += sizeof("Connection: keep-alive" CRLF) - 1;
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274
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275 /*
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276 * MSIE and Opera ignore the "Keep-Alive: timeout=<N>" header.
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277 * MSIE keeps the connection alive for about 60-65 seconds.
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278 * Opera keeps the connection alive very long.
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279 * Mozilla keeps the connection alive for N plus about 1-10 seconds.
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280 * Konqueror keeps the connection alive for about N seconds.
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281 */
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282
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22
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283 if (clcf->keepalive_header) {
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26
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284 len += sizeof("Keep-Alive: timeout=") - 1 + NGX_TIME_T_LEN + 2;
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0
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285 }
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286
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287 } else {
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288 len += sizeof("Connection: closed" CRLF) - 1;
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289 }
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290
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291 part = &r->headers_out.headers.part;
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292 header = part->elts;
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293
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294 for (i = 0; /* void */; i++) {
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295
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296 if (i >= part->nelts) {
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297 if (part->next == NULL) {
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298 break;
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299 }
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300
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301 part = part->next;
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302 header = part->elts;
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303 i = 0;
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304 }
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305
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306 if (header[i].key.len == 0) {
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307 continue;
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308 }
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309
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42
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310 len += header[i].key.len + sizeof(": ") - 1 + header[i].value.len
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311 + sizeof(CRLF) - 1;
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0
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312 }
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313
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314 if (!(b = ngx_create_temp_buf(r->pool, len))) {
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315 return NGX_ERROR;
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316 }
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317
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318 /* "HTTP/1.x " */
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319 b->last = ngx_cpymem(b->last, "HTTP/1.1 ", sizeof("HTTP/1.x ") - 1);
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320
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321 /* status line */
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322 if (r->headers_out.status_line.len) {
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323 b->last = ngx_cpymem(b->last, r->headers_out.status_line.data,
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324 r->headers_out.status_line.len);
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325
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326 } else {
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327 b->last = ngx_cpymem(b->last, http_codes[status].data,
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328 http_codes[status].len);
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329 }
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42
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330 *b->last++ = CR; *b->last++ = LF;
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0
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331
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332 if (!(r->headers_out.server && r->headers_out.server->key.len)) {
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333 b->last = ngx_cpymem(b->last, server_string, sizeof(server_string) - 1);
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334 }
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335
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336 if (!(r->headers_out.date && r->headers_out.date->key.len)) {
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337 b->last = ngx_cpymem(b->last, "Date: ", sizeof("Date: ") - 1);
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338 b->last = ngx_cpymem(b->last, ngx_cached_http_time.data,
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339 ngx_cached_http_time.len);
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340
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42
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341 *b->last++ = CR; *b->last++ = LF;
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0
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342 }
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343
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344 if (r->headers_out.content_length == NULL) {
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345 if (r->headers_out.content_length_n >= 0) {
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4
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346 b->last = ngx_sprintf(b->last, "Content-Length: %O" CRLF,
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347 r->headers_out.content_length_n);
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0
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348 }
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349 }
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350
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351 if (r->headers_out.content_type && r->headers_out.content_type->value.len) {
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352 b->last = ngx_cpymem(b->last, "Content-Type: ",
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353 sizeof("Content-Type: ") - 1);
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354 p = b->last;
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355 b->last = ngx_cpymem(b->last, r->headers_out.content_type->value.data,
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356 r->headers_out.content_type->value.len);
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357
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358 if (r->headers_out.charset.len) {
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359 b->last = ngx_cpymem(b->last, "; charset=",
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360 sizeof("; charset=") - 1);
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361 b->last = ngx_cpymem(b->last, r->headers_out.charset.data,
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362 r->headers_out.charset.len);
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363
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364 r->headers_out.content_type->value.len = b->last - p;
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365 r->headers_out.content_type->value.data = p;
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366 }
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367
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42
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368 *b->last++ = CR; *b->last++ = LF;
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0
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369 }
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370
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371 if (r->headers_out.location
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372 && r->headers_out.location->value.len
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373 && r->headers_out.location->value.data[0] == '/')
|
|
|
374 {
|
|
|
375 p = b->last + sizeof("Location: ") - 1;
|
|
|
376 b->last = ngx_cpymem(b->last, "Location: http://",
|
|
|
377 sizeof("Location: http://") - 1);
|
|
6
|
378 b->last = ngx_cpymem(b->last, r->server_name.data,
|
|
|
379 r->server_name.len);
|
|
0
|
380 if (r->port != 80) {
|
|
|
381 b->last = ngx_cpymem(b->last, r->port_text->data,
|
|
|
382 r->port_text->len);
|
|
|
383 }
|
|
|
384
|
|
|
385 b->last = ngx_cpymem(b->last, r->headers_out.location->value.data,
|
|
|
386 r->headers_out.location->value.len);
|
|
|
387
|
|
|
388 r->headers_out.location->value.len = b->last - p;
|
|
|
389 r->headers_out.location->value.data = p;
|
|
|
390
|
|
42
|
391 *b->last++ = CR; *b->last++ = LF;
|
|
0
|
392 }
|
|
|
393
|
|
|
394 if (!(r->headers_out.last_modified && r->headers_out.last_modified->key.len)
|
|
|
395 && r->headers_out.last_modified_time != -1)
|
|
|
396 {
|
|
|
397 b->last = ngx_cpymem(b->last, "Last-Modified: ",
|
|
|
398 sizeof("Last-Modified: ") - 1);
|
|
4
|
399 b->last = ngx_http_time(b->last, r->headers_out.last_modified_time);
|
|
0
|
400
|
|
42
|
401 *b->last++ = CR; *b->last++ = LF;
|
|
0
|
402 }
|
|
|
403
|
|
|
404 if (r->chunked) {
|
|
|
405 b->last = ngx_cpymem(b->last, "Transfer-Encoding: chunked" CRLF,
|
|
|
406 sizeof("Transfer-Encoding: chunked" CRLF) - 1);
|
|
|
407 }
|
|
|
408
|
|
|
409 if (r->keepalive) {
|
|
|
410 b->last = ngx_cpymem(b->last, "Connection: keep-alive" CRLF,
|
|
|
411 sizeof("Connection: keep-alive" CRLF) - 1);
|
|
|
412
|
|
22
|
413 if (clcf->keepalive_header) {
|
|
4
|
414 b->last = ngx_sprintf(b->last, "Keep-Alive: timeout=%T" CRLF,
|
|
|
415 clcf->keepalive_header);
|
|
0
|
416 }
|
|
|
417
|
|
|
418 } else {
|
|
|
419 b->last = ngx_cpymem(b->last, "Connection: close" CRLF,
|
|
|
420 sizeof("Connection: close" CRLF) - 1);
|
|
|
421 }
|
|
|
422
|
|
|
423 part = &r->headers_out.headers.part;
|
|
|
424 header = part->elts;
|
|
|
425
|
|
|
426 for (i = 0; /* void */; i++) {
|
|
|
427
|
|
|
428 if (i >= part->nelts) {
|
|
|
429 if (part->next == NULL) {
|
|
|
430 break;
|
|
|
431 }
|
|
|
432
|
|
|
433 part = part->next;
|
|
|
434 header = part->elts;
|
|
|
435 i = 0;
|
|
|
436 }
|
|
|
437
|
|
|
438 if (header[i].key.len == 0) {
|
|
|
439 continue;
|
|
|
440 }
|
|
|
441
|
|
|
442 b->last = ngx_cpymem(b->last, header[i].key.data, header[i].key.len);
|
|
42
|
443 *b->last++ = ':' ; *b->last++ = ' ' ;
|
|
0
|
444
|
|
|
445 b->last = ngx_cpymem(b->last, header[i].value.data,
|
|
|
446 header[i].value.len);
|
|
42
|
447 *b->last++ = CR; *b->last++ = LF;
|
|
0
|
448 }
|
|
|
449
|
|
|
450 #if (NGX_DEBUG)
|
|
42
|
451 *b->last = '\0';
|
|
0
|
452 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "%s\n", b->pos);
|
|
|
453 #endif
|
|
|
454
|
|
|
455 /* the end of HTTP header */
|
|
42
|
456 *b->last++ = CR; *b->last++ = LF;
|
|
0
|
457
|
|
|
458 r->header_size = b->last - b->pos;
|
|
|
459
|
|
|
460 if (r->header_only) {
|
|
|
461 b->last_buf = 1;
|
|
|
462 }
|
|
|
463
|
|
|
464 if (!(ln = ngx_alloc_chain_link(r->pool))) {
|
|
|
465 return NGX_ERROR;
|
|
|
466 }
|
|
|
467
|
|
|
468 ln->buf = b;
|
|
|
469 ln->next = NULL;
|
|
|
470
|
|
|
471 return ngx_http_write_filter(r, ln);
|
|
|
472 }
|
|
|
473
|
|
|
474
|
|
42
|
475 static ngx_int_t
|
|
|
476 ngx_http_header_filter_init(ngx_cycle_t *cycle)
|
|
0
|
477 {
|
|
|
478 ngx_http_top_header_filter = ngx_http_header_filter;
|
|
|
479
|
|
|
480 return NGX_OK;
|
|
|
481 }
|
