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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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37 NULL /* init child */
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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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53 ngx_null_string, /* "207 Multi-Status" */
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54
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55 #if 0
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56 ngx_null_string, /* "300 Multiple Choices" */
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57 #endif
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58
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59 ngx_string("301 Moved Permanently"),
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60 #if 0
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61 ngx_string("302 Moved Temporarily"),
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62 #else
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63 ngx_string("302 Found"),
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64 #endif
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65 ngx_null_string, /* "303 See Other" */
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66 ngx_string("304 Not Modified"),
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67
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68 ngx_string("400 Bad Request"),
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69 ngx_string("401 Unauthorized"),
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70 ngx_null_string, /* "402 Payment Required" */
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71 ngx_string("403 Forbidden"),
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72 ngx_string("404 Not Found"),
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73 ngx_string("405 Not Allowed"),
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74 ngx_null_string, /* "406 Not Acceptable" */
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75 ngx_null_string, /* "407 Proxy Authentication Required" */
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76 ngx_string("408 Request Time-out"),
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77 ngx_null_string, /* "409 Conflict" */
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78 ngx_null_string, /* "410 Gone" */
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79 ngx_string("411 Length Required"),
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80 ngx_null_string, /* "412 Precondition Failed" */
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81 ngx_string("413 Request Entity Too Large"),
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82 ngx_null_string, /* "414 Request-URI Too Large" but we never send it
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83 * because we treat such requests as the HTTP/0.9
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84 * requests and send only a body without a header
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85 */
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86 ngx_null_string, /* "415 Unsupported Media Type" */
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87 ngx_string("416 Requested Range Not Satisfiable"),
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88
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89 ngx_string("500 Internal Server Error"),
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90 ngx_string("501 Method Not Implemented"),
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91 ngx_string("502 Bad Gateway"),
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92 ngx_string("503 Service Temporarily Unavailable"),
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93 ngx_string("504 Gateway Time-out")
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94 };
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95
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96
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97 ngx_http_header_t ngx_http_headers_out[] = {
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98 { ngx_string("Server"), offsetof(ngx_http_headers_out_t, server) },
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99 { ngx_string("Date"), offsetof(ngx_http_headers_out_t, date) },
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100 { ngx_string("Content-Type"),
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101 offsetof(ngx_http_headers_out_t, content_type) },
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102 { ngx_string("Content-Length"),
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103 offsetof(ngx_http_headers_out_t, content_length) },
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104 { ngx_string("Content-Encoding"),
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105 offsetof(ngx_http_headers_out_t, content_encoding) },
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106 { ngx_string("Location"), offsetof(ngx_http_headers_out_t, location) },
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107 { ngx_string("Last-Modified"),
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108 offsetof(ngx_http_headers_out_t, last_modified) },
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109 { ngx_string("Accept-Ranges"),
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110 offsetof(ngx_http_headers_out_t, accept_ranges) },
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111 { ngx_string("Expires"), offsetof(ngx_http_headers_out_t, expires) },
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112 { ngx_string("Cache-Control"),
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113 offsetof(ngx_http_headers_out_t, cache_control) },
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114 { ngx_string("ETag"), offsetof(ngx_http_headers_out_t, etag) },
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115
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116 { ngx_null_string, 0 }
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117 };
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118
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119
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120 static ngx_int_t ngx_http_header_filter(ngx_http_request_t *r)
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121 {
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122 u_char *p;
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123 size_t len;
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124 ngx_uint_t status, i;
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125 ngx_buf_t *b;
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126 ngx_chain_t *ln;
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127 ngx_list_part_t *part;
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128 ngx_table_elt_t *header;
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129 ngx_http_core_loc_conf_t *clcf;
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130
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131 if (r->http_version < NGX_HTTP_VERSION_10) {
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132 return NGX_OK;
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133 }
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134
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135 if (r->method == NGX_HTTP_HEAD) {
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136 r->header_only = 1;
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137 }
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138
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139 if (r->headers_out.last_modified_time != -1) {
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140 if (r->headers_out.status != NGX_HTTP_OK
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141 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED
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142 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT)
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143 {
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144 r->headers_out.last_modified_time = -1;
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145 r->headers_out.last_modified = NULL;
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146 }
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147 }
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148
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149 /* 2 is for trailing "\r\n" and 2 is for "\r\n" in the end of header */
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150 len = sizeof("HTTP/1.x ") - 1 + 2 + 2;
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151
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152 /* status line */
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153 if (r->headers_out.status_line.len) {
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154 len += r->headers_out.status_line.len;
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155 #if (NGX_SUPPRESS_WARN)
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156 status = NGX_INVALID_ARRAY_INDEX;
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157 #endif
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158
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159 } else {
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160
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161 if (r->headers_out.status < NGX_HTTP_MOVED_PERMANENTLY) {
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162 /* 2XX */
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163 status = r->headers_out.status - NGX_HTTP_OK;
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164
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165 } else if (r->headers_out.status < NGX_HTTP_BAD_REQUEST) {
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166 /* 3XX */
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167 status = r->headers_out.status - NGX_HTTP_MOVED_PERMANENTLY + 8;
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168
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169 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) {
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170 r->header_only = 1;
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171 }
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172
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173 } else if (r->headers_out.status < NGX_HTTP_INTERNAL_SERVER_ERROR) {
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174 /* 4XX */
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175 status = r->headers_out.status - NGX_HTTP_BAD_REQUEST + 8 + 4;
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176
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177 } else {
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178 /* 5XX */
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179 status = r->headers_out.status
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180 - NGX_HTTP_INTERNAL_SERVER_ERROR + 8 + 4 + 17;
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181 }
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182
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183 len += http_codes[status].len;
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184 }
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185
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186 if (r->headers_out.server && r->headers_out.server->key.len) {
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187 len += r->headers_out.server->key.len
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188 + r->headers_out.server->value.len + 2;
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189 } else {
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190 len += sizeof(server_string) - 1;
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191 }
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192
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193 if (r->headers_out.date && r->headers_out.date->key.len) {
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194 len += r->headers_out.date->key.len
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195 + r->headers_out.date->value.len + 2;
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196 } else {
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197 len += sizeof("Date: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
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198 }
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199
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200 if (r->headers_out.content_length == NULL) {
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201 if (r->headers_out.content_length_n >= 0) {
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202 len += sizeof("Content-Length: ") - 1 + NGX_OFF_T_LEN + 2;
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203 }
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204 }
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205
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206 if (r->headers_out.content_type && r->headers_out.content_type->value.len) {
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207 r->headers_out.content_type->key.len = 0;
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208 len += sizeof("Content-Type: ") - 1
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209 + r->headers_out.content_type->value.len + 2;
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210
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211 if (r->headers_out.charset.len) {
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212 len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
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213 }
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214 }
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215
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216 if (r->headers_out.location
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217 && r->headers_out.location->value.len
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218 && r->headers_out.location->value.data[0] == '/')
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219 {
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220 r->headers_out.location->key.len = 0;
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221 len += sizeof("Location: http://") - 1
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222 + r->server_name->len + r->headers_out.location->value.len + 2;
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223
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224 if (r->port != 80) {
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225 len += r->port_text->len;
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226 }
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227 }
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228
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229 if (r->headers_out.last_modified && r->headers_out.last_modified->key.len) {
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230 len += r->headers_out.last_modified->key.len
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231 + r->headers_out.last_modified->value.len + 2;
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232
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233 } else if (r->headers_out.last_modified_time != -1) {
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234 len += sizeof("Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT" CRLF) - 1;
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235 }
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236
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237 if (r->chunked) {
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238 len += sizeof("Transfer-Encoding: chunked" CRLF) - 1;
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239 }
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240
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241 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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242
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243 if (r->keepalive) {
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244 len += sizeof("Connection: keep-alive" CRLF) - 1;
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245
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246 /*
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247 * MSIE and Opera ignore the "Keep-Alive: timeout=<N>" header.
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248 * MSIE keeps the connection alive for about 60-65 seconds.
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249 * Opera keeps the connection alive very long.
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250 * Mozilla keeps the connection alive for N plus about 1-10 seconds.
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251 * Konqueror keeps the connection alive for about N seconds.
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252 */
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253
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254 if (clcf->keepalive_header
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255 && (r->headers_in.gecko || r->headers_in.konqueror))
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256 {
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257 len += sizeof("Keep-Alive: timeout=") - 1 + TIME_T_LEN + 2;
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258 }
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259
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260 } else {
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261 len += sizeof("Connection: closed" CRLF) - 1;
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262 }
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263
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264 part = &r->headers_out.headers.part;
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265 header = part->elts;
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266
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267 for (i = 0; /* void */; i++) {
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268
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269 if (i >= part->nelts) {
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270 if (part->next == NULL) {
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271 break;
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272 }
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273
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274 part = part->next;
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275 header = part->elts;
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276 i = 0;
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277 }
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278
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279 if (header[i].key.len == 0) {
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280 continue;
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281 }
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282
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283 /* 2 is for ": " and 2 is for "\r\n" */
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284 len += header[i].key.len + 2 + header[i].value.len + 2;
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285 }
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286
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287 if (!(b = ngx_create_temp_buf(r->pool, len))) {
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288 return NGX_ERROR;
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289 }
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290
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291 /* "HTTP/1.x " */
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292 b->last = ngx_cpymem(b->last, "HTTP/1.1 ", sizeof("HTTP/1.x ") - 1);
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293
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294 /* status line */
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295 if (r->headers_out.status_line.len) {
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296 b->last = ngx_cpymem(b->last, r->headers_out.status_line.data,
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297 r->headers_out.status_line.len);
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298
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299 } else {
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300 b->last = ngx_cpymem(b->last, http_codes[status].data,
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301 http_codes[status].len);
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302 }
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303 *(b->last++) = CR; *(b->last++) = LF;
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304
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305 if (!(r->headers_out.server && r->headers_out.server->key.len)) {
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306 b->last = ngx_cpymem(b->last, server_string, sizeof(server_string) - 1);
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307 }
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308
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309 if (!(r->headers_out.date && r->headers_out.date->key.len)) {
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310 b->last = ngx_cpymem(b->last, "Date: ", sizeof("Date: ") - 1);
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311 b->last = ngx_cpymem(b->last, ngx_cached_http_time.data,
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312 ngx_cached_http_time.len);
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313
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314 *(b->last++) = CR; *(b->last++) = LF;
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315 }
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316
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317 if (r->headers_out.content_length == NULL) {
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318 if (r->headers_out.content_length_n >= 0) {
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319 b->last += ngx_snprintf((char *) b->last,
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320 sizeof("Content-Length: ") + NGX_OFF_T_LEN + 2,
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321 "Content-Length: " OFF_T_FMT CRLF,
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322 r->headers_out.content_length_n);
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323 }
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324 }
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325
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326 if (r->headers_out.content_type && r->headers_out.content_type->value.len) {
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327 b->last = ngx_cpymem(b->last, "Content-Type: ",
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328 sizeof("Content-Type: ") - 1);
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329 p = b->last;
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330 b->last = ngx_cpymem(b->last, r->headers_out.content_type->value.data,
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331 r->headers_out.content_type->value.len);
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332
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333 if (r->headers_out.charset.len) {
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334 b->last = ngx_cpymem(b->last, "; charset=",
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335 sizeof("; charset=") - 1);
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336 b->last = ngx_cpymem(b->last, r->headers_out.charset.data,
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337 r->headers_out.charset.len);
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338
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339 r->headers_out.content_type->value.len = b->last - p;
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340 r->headers_out.content_type->value.data = p;
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341 }
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342
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343 *(b->last++) = CR; *(b->last++) = LF;
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344 }
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345
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346 if (r->headers_out.location
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347 && r->headers_out.location->value.len
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348 && r->headers_out.location->value.data[0] == '/')
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349 {
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350 p = b->last + sizeof("Location: ") - 1;
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351 b->last = ngx_cpymem(b->last, "Location: http://",
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352 sizeof("Location: http://") - 1);
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353 b->last = ngx_cpymem(b->last, r->server_name->data,
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354 r->server_name->len);
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355 if (r->port != 80) {
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356 b->last = ngx_cpymem(b->last, r->port_text->data,
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357 r->port_text->len);
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358 }
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359
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360 b->last = ngx_cpymem(b->last, r->headers_out.location->value.data,
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361 r->headers_out.location->value.len);
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362
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363 r->headers_out.location->value.len = b->last - p;
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364 r->headers_out.location->value.data = p;
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365
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366 *(b->last++) = CR; *(b->last++) = LF;
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367 }
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368
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369 if (!(r->headers_out.last_modified && r->headers_out.last_modified->key.len)
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370 && r->headers_out.last_modified_time != -1)
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371 {
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372 b->last = ngx_cpymem(b->last, "Last-Modified: ",
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373 sizeof("Last-Modified: ") - 1);
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374 b->last += ngx_http_time(b->last, r->headers_out.last_modified_time);
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375
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376 *(b->last++) = CR; *(b->last++) = LF;
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377 }
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378
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379 if (r->chunked) {
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380 b->last = ngx_cpymem(b->last, "Transfer-Encoding: chunked" CRLF,
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|
|
381 sizeof("Transfer-Encoding: chunked" CRLF) - 1);
|
|
|
382 }
|
|
|
383
|
|
|
384 if (r->keepalive) {
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|
|
385 b->last = ngx_cpymem(b->last, "Connection: keep-alive" CRLF,
|
|
|
386 sizeof("Connection: keep-alive" CRLF) - 1);
|
|
|
387
|
|
|
388 if (clcf->keepalive_header
|
|
|
389 && (r->headers_in.gecko || r->headers_in.konqueror))
|
|
|
390 {
|
|
|
391 b->last += ngx_snprintf((char *) b->last,
|
|
|
392 sizeof("Keep-Alive: timeout=") + TIME_T_LEN + 2,
|
|
|
393 "Keep-Alive: timeout=" TIME_T_FMT CRLF,
|
|
|
394 clcf->keepalive_header);
|
|
|
395 }
|
|
|
396
|
|
|
397 } else {
|
|
|
398 b->last = ngx_cpymem(b->last, "Connection: close" CRLF,
|
|
|
399 sizeof("Connection: close" CRLF) - 1);
|
|
|
400 }
|
|
|
401
|
|
|
402 part = &r->headers_out.headers.part;
|
|
|
403 header = part->elts;
|
|
|
404
|
|
|
405 for (i = 0; /* void */; i++) {
|
|
|
406
|
|
|
407 if (i >= part->nelts) {
|
|
|
408 if (part->next == NULL) {
|
|
|
409 break;
|
|
|
410 }
|
|
|
411
|
|
|
412 part = part->next;
|
|
|
413 header = part->elts;
|
|
|
414 i = 0;
|
|
|
415 }
|
|
|
416
|
|
|
417 if (header[i].key.len == 0) {
|
|
|
418 continue;
|
|
|
419 }
|
|
|
420
|
|
|
421 b->last = ngx_cpymem(b->last, header[i].key.data, header[i].key.len);
|
|
|
422 *(b->last++) = ':' ; *(b->last++) = ' ' ;
|
|
|
423
|
|
|
424 b->last = ngx_cpymem(b->last, header[i].value.data,
|
|
|
425 header[i].value.len);
|
|
|
426 *(b->last++) = CR; *(b->last++) = LF;
|
|
|
427 }
|
|
|
428
|
|
|
429 #if (NGX_DEBUG)
|
|
|
430 *(b->last) = '\0';
|
|
|
431 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "%s\n", b->pos);
|
|
|
432 #endif
|
|
|
433
|
|
|
434 /* the end of HTTP header */
|
|
|
435 *(b->last++) = CR; *(b->last++) = LF;
|
|
|
436
|
|
|
437 r->header_size = b->last - b->pos;
|
|
|
438
|
|
|
439 if (r->header_only) {
|
|
|
440 b->last_buf = 1;
|
|
|
441 }
|
|
|
442
|
|
|
443 if (!(ln = ngx_alloc_chain_link(r->pool))) {
|
|
|
444 return NGX_ERROR;
|
|
|
445 }
|
|
|
446
|
|
|
447 ln->buf = b;
|
|
|
448 ln->next = NULL;
|
|
|
449
|
|
|
450 return ngx_http_write_filter(r, ln);
|
|
|
451 }
|
|
|
452
|
|
|
453
|
|
|
454 static ngx_int_t ngx_http_header_filter_init(ngx_cycle_t *cycle)
|
|
|
455 {
|
|
|
456 ngx_http_top_header_filter = ngx_http_header_filter;
|
|
|
457
|
|
|
458 return NGX_OK;
|
|
|
459 }
|
