Mercurial > hg > nginx
annotate src/http/modules/ngx_http_referer_module.c @ 1798:0379d1fc8701
bump version
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 27 Dec 2007 18:47:33 +0000 |
parents | 0673b54f34f7 |
children | 3e1c695258d3 |
rev | line source |
---|---|
577 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 #include <ngx_http.h> | |
10 | |
11 | |
595 | 12 #define NGX_HTTP_REFERER_NO_URI_PART ((void *) 4) |
13 | |
1785 | 14 #if !(NGX_PCRE) |
1388 | 15 |
16 #define ngx_regex_t void | |
17 | |
18 #endif | |
19 | |
20 | |
577 | 21 typedef struct { |
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22 ngx_hash_combined_t hash; |
577 | 23 |
1388 | 24 #if (NGX_PCRE) |
25 ngx_array_t *regex; | |
26 #endif | |
27 | |
593 | 28 ngx_flag_t no_referer; |
29 ngx_flag_t blocked_referer; | |
577 | 30 |
593 | 31 ngx_hash_keys_arrays_t *keys; |
577 | 32 } ngx_http_referer_conf_t; |
33 | |
34 | |
35 static void * ngx_http_referer_create_conf(ngx_conf_t *cf); | |
36 static char * ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, | |
37 void *child); | |
38 static char *ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, | |
39 void *conf); | |
593 | 40 static char *ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys, |
595 | 41 ngx_str_t *value, ngx_str_t *uri); |
1388 | 42 static char *ngx_http_add_regex_referer(ngx_conf_t *cf, |
43 ngx_http_referer_conf_t *rlcf, ngx_str_t *name, ngx_regex_t *regex); | |
593 | 44 static int ngx_libc_cdecl ngx_http_cmp_referer_wildcards(const void *one, |
45 const void *two); | |
577 | 46 |
47 | |
48 static ngx_command_t ngx_http_referer_commands[] = { | |
49 | |
50 { ngx_string("valid_referers"), | |
51 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, | |
52 ngx_http_valid_referers, | |
53 NGX_HTTP_LOC_CONF_OFFSET, | |
54 0, | |
55 NULL }, | |
56 | |
57 ngx_null_command | |
58 }; | |
59 | |
60 | |
61 static ngx_http_module_t ngx_http_referer_module_ctx = { | |
62 NULL, /* preconfiguration */ | |
63 NULL, /* postconfiguration */ | |
64 | |
65 NULL, /* create main configuration */ | |
66 NULL, /* init main configuration */ | |
67 | |
68 NULL, /* create server configuration */ | |
69 NULL, /* merge server configuration */ | |
70 | |
71 ngx_http_referer_create_conf, /* create location configuration */ | |
72 ngx_http_referer_merge_conf /* merge location configuration */ | |
73 }; | |
74 | |
75 | |
76 ngx_module_t ngx_http_referer_module = { | |
77 NGX_MODULE_V1, | |
78 &ngx_http_referer_module_ctx, /* module context */ | |
79 ngx_http_referer_commands, /* module directives */ | |
80 NGX_HTTP_MODULE, /* module type */ | |
81 NULL, /* init master */ | |
82 NULL, /* init module */ | |
83 NULL, /* init process */ | |
84 NULL, /* init thread */ | |
85 NULL, /* exit thread */ | |
86 NULL, /* exit process */ | |
87 NULL, /* exit master */ | |
88 NGX_MODULE_V1_PADDING | |
89 }; | |
90 | |
91 | |
92 static ngx_int_t | |
93 ngx_http_referer_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, | |
94 uintptr_t data) | |
95 { | |
1388 | 96 u_char *p, *ref, *last; |
97 size_t len; | |
98 ngx_str_t *uri; | |
99 ngx_uint_t i, key; | |
100 ngx_http_referer_conf_t *rlcf; | |
101 u_char buf[256]; | |
577 | 102 |
593 | 103 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_referer_module); |
577 | 104 |
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105 if (rlcf->hash.hash.buckets == NULL |
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106 && rlcf->hash.wc_head == NULL |
1388 | 107 && rlcf->hash.wc_tail == NULL |
108 #if (NGX_PCRE) | |
109 && rlcf->regex == NULL | |
110 #endif | |
111 ) | |
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112 { |
595 | 113 goto valid; |
577 | 114 } |
115 | |
116 if (r->headers_in.referer == NULL) { | |
593 | 117 if (rlcf->no_referer) { |
595 | 118 goto valid; |
119 } | |
577 | 120 |
595 | 121 goto invalid; |
577 | 122 } |
123 | |
124 len = r->headers_in.referer->value.len; | |
125 ref = r->headers_in.referer->value.data; | |
126 | |
127 if (len < sizeof("http://i.ru") - 1 | |
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128 || (ngx_strncasecmp(ref, (u_char *) "http://", 7) != 0)) |
577 | 129 { |
593 | 130 if (rlcf->blocked_referer) { |
595 | 131 goto valid; |
132 } | |
577 | 133 |
595 | 134 goto invalid; |
577 | 135 } |
136 | |
595 | 137 last = ref + len; |
577 | 138 ref += 7; |
595 | 139 i = 0; |
140 key = 0; | |
577 | 141 |
595 | 142 for (p = ref; p < last; p++) { |
593 | 143 if (*p == '/' || *p == ':') { |
144 break; | |
577 | 145 } |
595 | 146 |
147 buf[i] = ngx_tolower(*p); | |
148 key = ngx_hash(key, buf[i++]); | |
149 | |
150 if (i == 256) { | |
151 goto invalid; | |
152 } | |
593 | 153 } |
577 | 154 |
1388 | 155 uri = ngx_hash_find_combined(&rlcf->hash, key, buf, p - ref); |
577 | 156 |
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157 if (uri) { |
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158 goto uri; |
577 | 159 } |
160 | |
1388 | 161 #if (NGX_PCRE) |
162 | |
163 if (rlcf->regex) { | |
1785 | 164 ngx_int_t rc; |
165 ngx_str_t referer; | |
1388 | 166 |
167 referer.len = len - 7; | |
168 referer.data = ref; | |
169 | |
1785 | 170 rc = ngx_regex_exec_array(rlcf->regex, &referer, r->connection->log); |
1388 | 171 |
1785 | 172 if (rc == NGX_OK) { |
1388 | 173 goto valid; |
174 } | |
1785 | 175 |
176 if (rc == NGX_ERROR) { | |
177 return rc; | |
178 } | |
179 | |
180 /* NGX_DECLINED */ | |
1388 | 181 } |
182 | |
183 #endif | |
184 | |
595 | 185 invalid: |
186 | |
577 | 187 *v = ngx_http_variable_true_value; |
188 | |
189 return NGX_OK; | |
595 | 190 |
191 uri: | |
192 | |
193 for ( /* void */ ; p < last; p++) { | |
194 if (*p == '/') { | |
195 break; | |
196 } | |
197 } | |
198 | |
199 len = last - p; | |
200 | |
201 if (uri == NGX_HTTP_REFERER_NO_URI_PART) { | |
202 goto valid; | |
203 } | |
204 | |
205 if (len < uri->len || ngx_strncmp(uri->data, p, uri->len) != 0) { | |
206 goto invalid; | |
207 } | |
208 | |
209 valid: | |
210 | |
211 *v = ngx_http_variable_null_value; | |
212 | |
213 return NGX_OK; | |
577 | 214 } |
215 | |
216 | |
217 static void * | |
218 ngx_http_referer_create_conf(ngx_conf_t *cf) | |
219 { | |
220 ngx_http_referer_conf_t *conf; | |
221 | |
593 | 222 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_referer_conf_t)); |
577 | 223 if (conf == NULL) { |
224 return NGX_CONF_ERROR; | |
225 } | |
226 | |
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227 #if (NGX_PCRE) |
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228 conf->regex = NGX_CONF_UNSET_PTR; |
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229 #endif |
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230 |
577 | 231 conf->no_referer = NGX_CONF_UNSET; |
232 conf->blocked_referer = NGX_CONF_UNSET; | |
233 | |
234 return conf; | |
235 } | |
236 | |
237 | |
238 static char * | |
239 ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
240 { | |
241 ngx_http_referer_conf_t *prev = parent; | |
242 ngx_http_referer_conf_t *conf = child; | |
243 | |
593 | 244 ngx_hash_init_t hash; |
245 | |
246 if (conf->keys == NULL) { | |
247 conf->hash = prev->hash; | |
248 | |
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249 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL); |
577 | 250 ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0); |
251 ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0); | |
593 | 252 |
253 return NGX_CONF_OK; | |
254 } | |
255 | |
603 | 256 if ((conf->no_referer == 1 || conf->blocked_referer == 1) |
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257 && conf->keys->keys.nelts == 0 |
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258 && conf->keys->dns_wc_head.nelts == 0 |
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259 && conf->keys->dns_wc_tail.nelts == 0) |
603 | 260 { |
261 ngx_log_error(NGX_LOG_EMERG, cf->log, 0, | |
262 "the \"none\" or \"blocked\" referers are specified " | |
263 "in the \"valid_referers\" directive " | |
264 "without any valid referer"); | |
265 return NGX_CONF_ERROR; | |
266 } | |
267 | |
593 | 268 hash.key = ngx_hash_key_lc; |
269 hash.max_size = 2048; /* TODO: referer_hash_max_size; */ | |
270 hash.bucket_size = 64; /* TODO: referer_hash_bucket_size; */ | |
271 hash.name = "referers_hash"; | |
272 hash.pool = cf->pool; | |
273 | |
274 if (conf->keys->keys.nelts) { | |
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275 hash.hash = &conf->hash.hash; |
593 | 276 hash.temp_pool = NULL; |
277 | |
278 if (ngx_hash_init(&hash, conf->keys->keys.elts, conf->keys->keys.nelts) | |
279 != NGX_OK) | |
280 { | |
281 return NGX_CONF_ERROR; | |
282 } | |
283 } | |
284 | |
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285 if (conf->keys->dns_wc_head.nelts) { |
593 | 286 |
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287 ngx_qsort(conf->keys->dns_wc_head.elts, |
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288 (size_t) conf->keys->dns_wc_head.nelts, |
593 | 289 sizeof(ngx_hash_key_t), |
290 ngx_http_cmp_referer_wildcards); | |
291 | |
292 hash.hash = NULL; | |
293 hash.temp_pool = cf->temp_pool; | |
294 | |
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295 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_head.elts, |
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296 conf->keys->dns_wc_head.nelts) |
593 | 297 != NGX_OK) |
298 { | |
299 return NGX_CONF_ERROR; | |
300 } | |
301 | |
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302 conf->hash.wc_head = (ngx_hash_wildcard_t *) hash.hash; |
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303 } |
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304 |
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305 if (conf->keys->dns_wc_tail.nelts) { |
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306 |
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307 ngx_qsort(conf->keys->dns_wc_tail.elts, |
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308 (size_t) conf->keys->dns_wc_tail.nelts, |
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309 sizeof(ngx_hash_key_t), |
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310 ngx_http_cmp_referer_wildcards); |
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311 |
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312 hash.hash = NULL; |
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313 hash.temp_pool = cf->temp_pool; |
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314 |
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315 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_tail.elts, |
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316 conf->keys->dns_wc_tail.nelts) |
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317 != NGX_OK) |
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318 { |
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319 return NGX_CONF_ERROR; |
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320 } |
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321 |
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322 conf->hash.wc_tail = (ngx_hash_wildcard_t *) hash.hash; |
577 | 323 } |
324 | |
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325 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL); |
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326 |
577 | 327 if (conf->no_referer == NGX_CONF_UNSET) { |
328 conf->no_referer = 0; | |
329 } | |
330 | |
331 if (conf->blocked_referer == NGX_CONF_UNSET) { | |
332 conf->blocked_referer = 0; | |
333 } | |
334 | |
611 | 335 conf->keys = NULL; |
336 | |
577 | 337 return NGX_CONF_OK; |
338 } | |
339 | |
340 | |
341 static char * | |
342 ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
343 { | |
593 | 344 ngx_http_referer_conf_t *rlcf = conf; |
577 | 345 |
593 | 346 u_char *p; |
595 | 347 ngx_str_t *value, uri, name; |
593 | 348 ngx_uint_t i, n; |
577 | 349 ngx_http_variable_t *var; |
350 ngx_http_server_name_t *sn; | |
351 ngx_http_core_srv_conf_t *cscf; | |
352 | |
353 name.len = sizeof("invalid_referer") - 1; | |
354 name.data = (u_char *) "invalid_referer"; | |
355 | |
583 | 356 var = ngx_http_add_variable(cf, &name, |
1565 | 357 NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOHASH); |
577 | 358 if (var == NULL) { |
359 return NGX_CONF_ERROR; | |
360 } | |
361 | |
637 | 362 var->get_handler = ngx_http_referer_variable; |
577 | 363 |
593 | 364 if (rlcf->keys == NULL) { |
365 rlcf->keys = ngx_pcalloc(cf->temp_pool, sizeof(ngx_hash_keys_arrays_t)); | |
366 if (rlcf->keys == NULL) { | |
367 return NGX_CONF_ERROR; | |
368 } | |
577 | 369 |
593 | 370 rlcf->keys->pool = cf->pool; |
371 rlcf->keys->temp_pool = cf->pool; | |
372 | |
373 if (ngx_hash_keys_array_init(rlcf->keys, NGX_HASH_SMALL) != NGX_OK) { | |
577 | 374 return NGX_CONF_ERROR; |
375 } | |
376 } | |
377 | |
378 value = cf->args->elts; | |
379 | |
380 for (i = 1; i < cf->args->nelts; i++) { | |
381 if (value[i].len == 0) { | |
382 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
383 "invalid referer \"%V\"", &value[i]); | |
384 return NGX_CONF_ERROR; | |
385 } | |
386 | |
387 if (ngx_strcmp(value[i].data, "none") == 0) { | |
593 | 388 rlcf->no_referer = 1; |
577 | 389 continue; |
390 } | |
391 | |
392 if (ngx_strcmp(value[i].data, "blocked") == 0) { | |
593 | 393 rlcf->blocked_referer = 1; |
577 | 394 continue; |
395 } | |
396 | |
595 | 397 uri.len = 0; |
613 | 398 uri.data = NULL; |
595 | 399 |
577 | 400 if (ngx_strcmp(value[i].data, "server_names") == 0) { |
593 | 401 |
402 cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module); | |
577 | 403 |
593 | 404 sn = cscf->server_names.elts; |
405 for (n = 0; n < cscf->server_names.nelts; n++) { | |
1388 | 406 |
407 #if (NGX_PCRE) | |
408 if (sn[n].regex) { | |
409 | |
410 if (ngx_http_add_regex_referer(cf, rlcf, &sn[n].name, | |
411 sn[n].regex) | |
412 != NGX_OK) | |
413 { | |
414 return NGX_CONF_ERROR; | |
415 } | |
416 | |
417 continue; | |
418 } | |
419 #endif | |
420 | |
595 | 421 if (ngx_http_add_referer(cf, rlcf->keys, &sn[n].name, &uri) |
422 != NGX_OK) | |
423 { | |
593 | 424 return NGX_CONF_ERROR; |
425 } | |
426 } | |
577 | 427 |
428 continue; | |
429 } | |
430 | |
1388 | 431 if (value[i].data[0] == '~') { |
432 if (ngx_http_add_regex_referer(cf, rlcf, &value[i], NULL) != NGX_OK) | |
433 { | |
434 return NGX_CONF_ERROR; | |
435 } | |
436 | |
437 continue; | |
438 } | |
439 | |
1242 | 440 p = (u_char *) ngx_strchr(value[i].data, '/'); |
577 | 441 |
593 | 442 if (p) { |
595 | 443 uri.len = (value[i].data + value[i].len) - p; |
444 uri.data = p; | |
593 | 445 value[i].len = p - value[i].data; |
577 | 446 } |
447 | |
595 | 448 if (ngx_http_add_referer(cf, rlcf->keys, &value[i], &uri) != NGX_OK) { |
577 | 449 return NGX_CONF_ERROR; |
450 } | |
451 } | |
452 | |
453 return NGX_CONF_OK; | |
454 } | |
593 | 455 |
456 | |
457 static char * | |
458 ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys, | |
595 | 459 ngx_str_t *value, ngx_str_t *uri) |
593 | 460 { |
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461 ngx_int_t rc; |
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462 ngx_str_t *u; |
593 | 463 |
595 | 464 if (uri->len == 0) { |
465 u = NGX_HTTP_REFERER_NO_URI_PART; | |
466 | |
467 } else { | |
468 u = ngx_palloc(cf->pool, sizeof(ngx_str_t)); | |
469 if (u == NULL) { | |
470 return NGX_CONF_ERROR; | |
471 } | |
472 | |
473 *u = *uri; | |
474 } | |
475 | |
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476 rc = ngx_hash_add_key(keys, value, u, NGX_HASH_WILDCARD_KEY); |
593 | 477 |
478 if (rc == NGX_OK) { | |
479 return NGX_CONF_OK; | |
480 } | |
481 | |
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482 if (rc == NGX_DECLINED) { |
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483 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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484 "invalid hostname or wildcard \"%V\"", value); |
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485 } |
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486 |
593 | 487 if (rc == NGX_BUSY) { |
488 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
489 "conflicting parameter \"%V\"", value); | |
490 } | |
491 | |
492 return NGX_CONF_ERROR; | |
493 } | |
494 | |
495 | |
1388 | 496 static char * |
497 ngx_http_add_regex_referer(ngx_conf_t *cf, ngx_http_referer_conf_t *rlcf, | |
498 ngx_str_t *name, ngx_regex_t *regex) | |
499 { | |
500 #if (NGX_PCRE) | |
1785 | 501 ngx_str_t err; |
502 ngx_regex_elt_t *re; | |
503 u_char errstr[NGX_MAX_CONF_ERRSTR]; | |
1388 | 504 |
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505 if (rlcf->regex == NGX_CONF_UNSET_PTR) { |
1785 | 506 rlcf->regex = ngx_array_create(cf->pool, 2, sizeof(ngx_regex_elt_t)); |
1388 | 507 if (rlcf->regex == NULL) { |
508 return NGX_CONF_ERROR; | |
509 } | |
510 } | |
511 | |
1785 | 512 re = ngx_array_push(rlcf->regex); |
513 if (re == NULL) { | |
1388 | 514 return NGX_CONF_ERROR; |
515 } | |
516 | |
517 if (regex) { | |
1785 | 518 re->regex = regex; |
519 re->name = name->data; | |
1388 | 520 |
521 return NGX_CONF_OK; | |
522 } | |
523 | |
524 err.len = NGX_MAX_CONF_ERRSTR; | |
525 err.data = errstr; | |
526 | |
527 name->len--; | |
528 name->data++; | |
529 | |
1785 | 530 re->regex = ngx_regex_compile(name, NGX_REGEX_CASELESS, cf->pool, &err); |
1388 | 531 |
1785 | 532 if (re->regex == NULL) { |
1388 | 533 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s", err.data); |
534 return NGX_CONF_ERROR; | |
535 } | |
536 | |
1785 | 537 re->name = name->data; |
1388 | 538 |
539 return NGX_CONF_OK; | |
540 | |
541 #else | |
542 | |
543 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
544 "the using of the regex \"%V\" requires PCRE library", | |
545 name); | |
546 | |
547 return NGX_CONF_ERROR; | |
548 | |
549 #endif | |
550 } | |
551 | |
552 | |
593 | 553 static int ngx_libc_cdecl |
554 ngx_http_cmp_referer_wildcards(const void *one, const void *two) | |
555 { | |
556 ngx_hash_key_t *first, *second; | |
557 | |
558 first = (ngx_hash_key_t *) one; | |
559 second = (ngx_hash_key_t *) two; | |
560 | |
561 return ngx_strcmp(first->key.data, second->key.data); | |
562 } |