Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_headers_filter_module.c @ 4664:356c91151658 stable-1.2
Merge of r4618: rewrite escaping fix (ticket #162).
The following code resulted in incorrect escaping of uri and possible
segfault:
location / {
rewrite ^(.*) $1?c=$1;
return 200 "$uri";
}
If there were arguments in a rewrite's replacement string, and length was
actually calculated (due to duplicate captures as in the example above,
or variables present), the is_args flag was set and incorrectly copied
after length calculation. This resulted in escaping applied to the uri part
of the replacement, resulting in incorrect escaping. Additionally, buffer
was allocated without escaping expected, thus this also resulted in buffer
overrun and possible segfault.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 04 Jun 2012 11:07:19 +0000 |
parents | 4c1e6cef1453 |
children | 3cb5cf1e1439 4c3c409ed306 |
rev | line source |
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441
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1 |
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2 /* |
444
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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6 |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_http.h> |
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11 |
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12 |
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13 typedef struct ngx_http_header_val_s ngx_http_header_val_t; |
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14 |
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15 typedef ngx_int_t (*ngx_http_set_header_pt)(ngx_http_request_t *r, |
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16 ngx_http_header_val_t *hv, ngx_str_t *value); |
625 | 17 |
18 | |
19 typedef struct { | |
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20 ngx_str_t name; |
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21 ngx_uint_t offset; |
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22 ngx_http_set_header_pt handler; |
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23 } ngx_http_set_header_t; |
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24 |
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25 |
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26 struct ngx_http_header_val_s { |
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27 ngx_http_complex_value_t value; |
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28 ngx_str_t key; |
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29 ngx_http_set_header_pt handler; |
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30 ngx_uint_t offset; |
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31 }; |
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32 |
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33 |
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34 typedef enum { |
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35 NGX_HTTP_EXPIRES_OFF, |
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36 NGX_HTTP_EXPIRES_EPOCH, |
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37 NGX_HTTP_EXPIRES_MAX, |
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38 NGX_HTTP_EXPIRES_ACCESS, |
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39 NGX_HTTP_EXPIRES_MODIFIED, |
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40 NGX_HTTP_EXPIRES_DAILY, |
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41 NGX_HTTP_EXPIRES_UNSET |
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42 } ngx_http_expires_t; |
2013 | 43 |
44 | |
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45 typedef struct { |
4547
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46 ngx_http_expires_t expires; |
2013 | 47 time_t expires_time; |
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48 ngx_array_t *headers; |
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49 } ngx_http_headers_conf_t; |
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50 |
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51 |
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52 static ngx_int_t ngx_http_set_expires(ngx_http_request_t *r, |
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53 ngx_http_headers_conf_t *conf); |
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54 static ngx_int_t ngx_http_add_cache_control(ngx_http_request_t *r, |
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55 ngx_http_header_val_t *hv, ngx_str_t *value); |
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56 static ngx_int_t ngx_http_add_header(ngx_http_request_t *r, |
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57 ngx_http_header_val_t *hv, ngx_str_t *value); |
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58 static ngx_int_t ngx_http_set_last_modified(ngx_http_request_t *r, |
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59 ngx_http_header_val_t *hv, ngx_str_t *value); |
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60 |
326
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61 static void *ngx_http_headers_create_conf(ngx_conf_t *cf); |
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62 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf, |
573 | 63 void *parent, void *child); |
681 | 64 static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf); |
501 | 65 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, |
66 void *conf); | |
573 | 67 static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, |
68 void *conf); | |
326
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69 |
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70 |
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71 static ngx_http_set_header_t ngx_http_set_headers[] = { |
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72 |
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73 { ngx_string("Cache-Control"), 0, ngx_http_add_cache_control }, |
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74 |
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75 { ngx_string("Last-Modified"), |
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76 offsetof(ngx_http_headers_out_t, last_modified), |
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77 ngx_http_set_last_modified }, |
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78 |
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79 { ngx_null_string, 0, NULL } |
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80 }; |
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81 |
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82 |
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83 static ngx_command_t ngx_http_headers_filter_commands[] = { |
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84 |
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85 { ngx_string("expires"), |
573 | 86 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF |
2013 | 87 |NGX_CONF_TAKE12, |
326
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88 ngx_http_headers_expires, |
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89 NGX_HTTP_LOC_CONF_OFFSET, |
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90 0, |
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91 NULL}, |
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92 |
573 | 93 { ngx_string("add_header"), |
94 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF | |
95 |NGX_CONF_TAKE2, | |
96 ngx_http_headers_add, | |
97 NGX_HTTP_LOC_CONF_OFFSET, | |
98 0, | |
99 NULL}, | |
100 | |
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101 ngx_null_command |
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102 }; |
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103 |
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104 |
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105 static ngx_http_module_t ngx_http_headers_filter_module_ctx = { |
509 | 106 NULL, /* preconfiguration */ |
681 | 107 ngx_http_headers_filter_init, /* postconfiguration */ |
326
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108 |
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109 NULL, /* create main configuration */ |
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110 NULL, /* init main configuration */ |
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111 |
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112 NULL, /* create server configuration */ |
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113 NULL, /* merge server configuration */ |
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114 |
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115 ngx_http_headers_create_conf, /* create location configuration */ |
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116 ngx_http_headers_merge_conf /* merge location configuration */ |
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117 }; |
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118 |
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119 |
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120 ngx_module_t ngx_http_headers_filter_module = { |
509 | 121 NGX_MODULE_V1, |
326
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122 &ngx_http_headers_filter_module_ctx, /* module context */ |
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123 ngx_http_headers_filter_commands, /* module directives */ |
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124 NGX_HTTP_MODULE, /* module type */ |
541 | 125 NULL, /* init master */ |
681 | 126 NULL, /* init module */ |
541 | 127 NULL, /* init process */ |
128 NULL, /* init thread */ | |
129 NULL, /* exit thread */ | |
130 NULL, /* exit process */ | |
131 NULL, /* exit master */ | |
132 NGX_MODULE_V1_PADDING | |
326
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133 }; |
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134 |
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135 |
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136 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; |
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137 |
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138 |
501 | 139 static ngx_int_t |
140 ngx_http_headers_filter(ngx_http_request_t *r) | |
326
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141 { |
1364 | 142 ngx_str_t value; |
509 | 143 ngx_uint_t i; |
625 | 144 ngx_http_header_val_t *h; |
326
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145 ngx_http_headers_conf_t *conf; |
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146 |
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147 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module); |
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148 |
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149 if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL) |
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150 || r != r->main |
663 | 151 || (r->headers_out.status != NGX_HTTP_OK |
152 && r->headers_out.status != NGX_HTTP_NO_CONTENT | |
4314
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153 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT |
663 | 154 && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY |
155 && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY | |
4491
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156 && r->headers_out.status != NGX_HTTP_SEE_OTHER |
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157 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED |
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158 && r->headers_out.status != NGX_HTTP_TEMPORARY_REDIRECT)) |
543 | 159 { |
326
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160 return ngx_http_next_header_filter(r); |
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161 } |
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162 |
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163 if (conf->expires != NGX_HTTP_EXPIRES_OFF) { |
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164 if (ngx_http_set_expires(r, conf) != NGX_OK) { |
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165 return NGX_ERROR; |
326
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166 } |
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167 } |
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168 |
573 | 169 if (conf->headers) { |
170 h = conf->headers->elts; | |
171 for (i = 0; i < conf->headers->nelts; i++) { | |
625 | 172 |
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173 if (ngx_http_complex_value(r, &h[i].value, &value) != NGX_OK) { |
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174 return NGX_ERROR; |
625 | 175 } |
176 | |
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177 if (h[i].handler(r, &h[i], &value) != NGX_OK) { |
625 | 178 return NGX_ERROR; |
179 } | |
573 | 180 } |
181 } | |
182 | |
326
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183 return ngx_http_next_header_filter(r); |
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184 } |
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185 |
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186 |
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187 static ngx_int_t |
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188 ngx_http_set_expires(ngx_http_request_t *r, ngx_http_headers_conf_t *conf) |
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189 { |
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190 size_t len; |
2163 | 191 time_t now, expires_time, max_age; |
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192 ngx_uint_t i; |
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193 ngx_table_elt_t *expires, *cc, **ccp; |
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194 |
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195 expires = r->headers_out.expires; |
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196 |
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197 if (expires == NULL) { |
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198 |
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199 expires = ngx_list_push(&r->headers_out.headers); |
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200 if (expires == NULL) { |
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201 return NGX_ERROR; |
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202 } |
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203 |
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204 r->headers_out.expires = expires; |
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205 |
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206 expires->hash = 1; |
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207 ngx_str_set(&expires->key, "Expires"); |
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208 } |
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209 |
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210 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT"); |
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211 expires->value.len = len - 1; |
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212 |
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213 ccp = r->headers_out.cache_control.elts; |
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214 |
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215 if (ccp == NULL) { |
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216 |
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217 if (ngx_array_init(&r->headers_out.cache_control, r->pool, |
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218 1, sizeof(ngx_table_elt_t *)) |
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219 != NGX_OK) |
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220 { |
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221 return NGX_ERROR; |
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222 } |
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223 |
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224 ccp = ngx_array_push(&r->headers_out.cache_control); |
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225 if (ccp == NULL) { |
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226 return NGX_ERROR; |
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227 } |
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228 |
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229 cc = ngx_list_push(&r->headers_out.headers); |
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230 if (cc == NULL) { |
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231 return NGX_ERROR; |
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232 } |
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233 |
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234 cc->hash = 1; |
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235 ngx_str_set(&cc->key, "Cache-Control"); |
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236 *ccp = cc; |
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237 |
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238 } else { |
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239 for (i = 1; i < r->headers_out.cache_control.nelts; i++) { |
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240 ccp[i]->hash = 0; |
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241 } |
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242 |
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243 cc = ccp[0]; |
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244 } |
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245 |
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246 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) { |
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247 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT"; |
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248 ngx_str_set(&cc->value, "no-cache"); |
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249 return NGX_OK; |
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250 } |
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251 |
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252 if (conf->expires == NGX_HTTP_EXPIRES_MAX) { |
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253 expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT"; |
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254 /* 10 years */ |
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255 ngx_str_set(&cc->value, "max-age=315360000"); |
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256 return NGX_OK; |
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257 } |
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258 |
2049 | 259 expires->value.data = ngx_pnalloc(r->pool, len); |
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260 if (expires->value.data == NULL) { |
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261 return NGX_ERROR; |
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262 } |
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263 |
4216 | 264 if (conf->expires_time == 0 && conf->expires != NGX_HTTP_EXPIRES_DAILY) { |
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265 ngx_memcpy(expires->value.data, ngx_cached_http_time.data, |
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266 ngx_cached_http_time.len + 1); |
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267 ngx_str_set(&cc->value, "max-age=0"); |
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268 return NGX_OK; |
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269 } |
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270 |
2163 | 271 now = ngx_time(); |
272 | |
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273 if (conf->expires == NGX_HTTP_EXPIRES_DAILY) { |
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274 expires_time = ngx_next_time(conf->expires_time); |
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275 max_age = expires_time - now; |
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276 |
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277 } else if (conf->expires == NGX_HTTP_EXPIRES_ACCESS |
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278 || r->headers_out.last_modified_time == -1) |
2013 | 279 { |
2163 | 280 expires_time = now + conf->expires_time; |
281 max_age = conf->expires_time; | |
282 | |
2013 | 283 } else { |
2163 | 284 expires_time = r->headers_out.last_modified_time + conf->expires_time; |
285 max_age = expires_time - now; | |
2013 | 286 } |
287 | |
2163 | 288 ngx_http_time(expires->value.data, expires_time); |
2013 | 289 |
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290 if (conf->expires_time < 0 || max_age < 0) { |
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291 ngx_str_set(&cc->value, "no-cache"); |
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292 return NGX_OK; |
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293 } |
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294 |
2049 | 295 cc->value.data = ngx_pnalloc(r->pool, |
296 sizeof("max-age=") + NGX_TIME_T_LEN + 1); | |
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297 if (cc->value.data == NULL) { |
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298 return NGX_ERROR; |
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299 } |
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300 |
2163 | 301 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", max_age) |
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302 - cc->value.data; |
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303 |
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304 return NGX_OK; |
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305 } |
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306 |
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307 |
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308 static ngx_int_t |
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309 ngx_http_add_header(ngx_http_request_t *r, ngx_http_header_val_t *hv, |
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310 ngx_str_t *value) |
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311 { |
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312 ngx_table_elt_t *h; |
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313 |
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314 if (value->len) { |
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315 h = ngx_list_push(&r->headers_out.headers); |
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316 if (h == NULL) { |
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317 return NGX_ERROR; |
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318 } |
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319 |
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320 h->hash = 1; |
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321 h->key = hv->key; |
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322 h->value = *value; |
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323 } |
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324 |
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325 return NGX_OK; |
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326 } |
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327 |
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328 |
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329 static ngx_int_t |
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330 ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv, |
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331 ngx_str_t *value) |
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332 { |
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333 ngx_table_elt_t *cc, **ccp; |
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334 |
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335 ccp = r->headers_out.cache_control.elts; |
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336 |
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337 if (ccp == NULL) { |
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338 |
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339 if (ngx_array_init(&r->headers_out.cache_control, r->pool, |
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340 1, sizeof(ngx_table_elt_t *)) |
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341 != NGX_OK) |
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342 { |
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343 return NGX_ERROR; |
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344 } |
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345 } |
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346 |
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347 ccp = ngx_array_push(&r->headers_out.cache_control); |
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348 if (ccp == NULL) { |
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349 return NGX_ERROR; |
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350 } |
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351 |
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352 cc = ngx_list_push(&r->headers_out.headers); |
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353 if (cc == NULL) { |
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354 return NGX_ERROR; |
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355 } |
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356 |
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357 cc->hash = 1; |
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358 ngx_str_set(&cc->key, "Cache-Control"); |
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359 cc->value = *value; |
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360 |
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361 *ccp = cc; |
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362 |
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363 return NGX_OK; |
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364 } |
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365 |
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366 |
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367 static ngx_int_t |
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368 ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv, |
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369 ngx_str_t *value) |
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370 { |
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371 ngx_table_elt_t *h, **old; |
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372 |
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373 old = (ngx_table_elt_t **) ((char *) &r->headers_out + hv->offset); |
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374 |
1655 | 375 r->headers_out.last_modified_time = -1; |
376 | |
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377 if (*old == NULL) { |
1655 | 378 |
379 if (value->len == 0) { | |
380 return NGX_OK; | |
381 } | |
382 | |
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383 h = ngx_list_push(&r->headers_out.headers); |
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384 if (h == NULL) { |
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385 return NGX_ERROR; |
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386 } |
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387 |
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388 *old = h; |
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389 |
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390 } else { |
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391 h = *old; |
1655 | 392 |
393 if (value->len == 0) { | |
394 h->hash = 0; | |
395 return NGX_OK; | |
396 } | |
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397 } |
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398 |
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399 h->hash = 1; |
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400 h->key = hv->key; |
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401 h->value = *value; |
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402 |
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403 return NGX_OK; |
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404 } |
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405 |
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406 |
501 | 407 static void * |
408 ngx_http_headers_create_conf(ngx_conf_t *cf) | |
577 | 409 { |
326
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410 ngx_http_headers_conf_t *conf; |
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411 |
573 | 412 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t)); |
501 | 413 if (conf == NULL) { |
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414 return NULL; |
326
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415 } |
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416 |
573 | 417 /* |
418 * set by ngx_pcalloc(): | |
419 * | |
420 * conf->headers = NULL; | |
2013 | 421 * conf->expires_time = 0; |
573 | 422 */ |
423 | |
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424 conf->expires = NGX_HTTP_EXPIRES_UNSET; |
326
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425 |
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426 return conf; |
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427 } |
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428 |
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429 |
501 | 430 static char * |
431 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
326
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432 { |
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433 ngx_http_headers_conf_t *prev = parent; |
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434 ngx_http_headers_conf_t *conf = child; |
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435 |
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436 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) { |
2013 | 437 conf->expires = prev->expires; |
438 conf->expires_time = prev->expires_time; | |
439 | |
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440 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) { |
2013 | 441 conf->expires = NGX_HTTP_EXPIRES_OFF; |
442 } | |
326
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443 } |
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444 |
573 | 445 if (conf->headers == NULL) { |
446 conf->headers = prev->headers; | |
447 } | |
448 | |
326
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449 return NGX_CONF_OK; |
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450 } |
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451 |
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452 |
681 | 453 static ngx_int_t |
454 ngx_http_headers_filter_init(ngx_conf_t *cf) | |
455 { | |
456 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
457 ngx_http_top_header_filter = ngx_http_headers_filter; | |
458 | |
459 return NGX_OK; | |
460 } | |
461 | |
462 | |
501 | 463 static char * |
464 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
326
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465 { |
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466 ngx_http_headers_conf_t *hcf = conf; |
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467 |
2013 | 468 ngx_uint_t minus, n; |
326
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469 ngx_str_t *value; |
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470 |
4547
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Minor ngx_http_headers_filter_module.c code cleanup.
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471 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) { |
326
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472 return "is duplicate"; |
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473 } |
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474 |
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475 value = cf->args->elts; |
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476 |
2013 | 477 if (cf->args->nelts == 2) { |
478 | |
479 if (ngx_strcmp(value[1].data, "epoch") == 0) { | |
480 hcf->expires = NGX_HTTP_EXPIRES_EPOCH; | |
481 return NGX_CONF_OK; | |
482 } | |
483 | |
484 if (ngx_strcmp(value[1].data, "max") == 0) { | |
485 hcf->expires = NGX_HTTP_EXPIRES_MAX; | |
486 return NGX_CONF_OK; | |
487 } | |
326
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488 |
2013 | 489 if (ngx_strcmp(value[1].data, "off") == 0) { |
490 hcf->expires = NGX_HTTP_EXPIRES_OFF; | |
491 return NGX_CONF_OK; | |
492 } | |
493 | |
494 hcf->expires = NGX_HTTP_EXPIRES_ACCESS; | |
495 | |
496 n = 1; | |
497 | |
498 } else { /* cf->args->nelts == 3 */ | |
499 | |
500 if (ngx_strcmp(value[1].data, "modified") != 0) { | |
501 return "invalid value"; | |
502 } | |
503 | |
504 hcf->expires = NGX_HTTP_EXPIRES_MODIFIED; | |
505 | |
506 n = 2; | |
729 | 507 } |
508 | |
2163 | 509 if (value[n].data[0] == '@') { |
510 value[n].data++; | |
511 value[n].len--; | |
512 minus = 0; | |
513 | |
514 if (hcf->expires == NGX_HTTP_EXPIRES_MODIFIED) { | |
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Replaced "can not" with "cannot" and "could not" in a bunch of places.
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|
515 return "daily time cannot be used with \"modified\" parameter"; |
2163 | 516 } |
517 | |
518 hcf->expires = NGX_HTTP_EXPIRES_DAILY; | |
519 | |
520 } else if (value[n].data[0] == '+') { | |
2013 | 521 value[n].data++; |
522 value[n].len--; | |
326
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523 minus = 0; |
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524 |
2013 | 525 } else if (value[n].data[0] == '-') { |
526 value[n].data++; | |
527 value[n].len--; | |
326
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528 minus = 1; |
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|
529 |
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530 } else { |
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531 minus = 0; |
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532 } |
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533 |
2013 | 534 hcf->expires_time = ngx_parse_time(&value[n], 1); |
501 | 535 |
4474 | 536 if (hcf->expires_time == (time_t) NGX_ERROR) { |
326
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537 return "invalid value"; |
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|
538 } |
577 | 539 |
2164 | 540 if (hcf->expires == NGX_HTTP_EXPIRES_DAILY |
541 && hcf->expires_time > 24 * 60 * 60) | |
542 { | |
543 return "daily time value must be less than 24 hours"; | |
544 } | |
545 | |
326
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|
546 if (minus) { |
2013 | 547 hcf->expires_time = - hcf->expires_time; |
326
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548 } |
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549 |
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550 return NGX_CONF_OK; |
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|
551 } |
573 | 552 |
553 | |
554 static char * | |
555 ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
556 { | |
557 ngx_http_headers_conf_t *hcf = conf; | |
558 | |
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559 ngx_str_t *value; |
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560 ngx_uint_t i; |
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561 ngx_http_header_val_t *hv; |
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562 ngx_http_set_header_t *set; |
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563 ngx_http_compile_complex_value_t ccv; |
573 | 564 |
565 value = cf->args->elts; | |
566 | |
567 if (hcf->headers == NULL) { | |
625 | 568 hcf->headers = ngx_array_create(cf->pool, 1, |
569 sizeof(ngx_http_header_val_t)); | |
573 | 570 if (hcf->headers == NULL) { |
571 return NGX_CONF_ERROR; | |
572 } | |
573 } | |
574 | |
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575 hv = ngx_array_push(hcf->headers); |
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576 if (hv == NULL) { |
573 | 577 return NGX_CONF_ERROR; |
578 } | |
579 | |
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580 hv->key = value[1]; |
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581 hv->handler = ngx_http_add_header; |
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582 hv->offset = 0; |
625 | 583 |
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584 set = ngx_http_set_headers; |
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585 for (i = 0; set[i].name.len; i++) { |
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586 if (ngx_strcasecmp(value[1].data, set[i].name.data) != 0) { |
1363
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587 continue; |
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|
588 } |
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589 |
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590 hv->offset = set[i].offset; |
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591 hv->handler = set[i].handler; |
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592 |
1363
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593 break; |
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594 } |
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595 |
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596 if (value[2].len == 0) { |
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597 ngx_memzero(&hv->value, sizeof(ngx_http_complex_value_t)); |
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598 return NGX_CONF_OK; |
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599 } |
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|
600 |
2588
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601 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); |
625 | 602 |
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603 ccv.cf = cf; |
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604 ccv.value = &value[2]; |
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605 ccv.complex_value = &hv->value; |
625 | 606 |
2588
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|
607 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { |
625 | 608 return NGX_CONF_ERROR; |
609 } | |
573 | 610 |
611 return NGX_CONF_OK; | |
612 } |