Mercurial > hg > nginx
annotate src/http/modules/ngx_http_referer_module.c @ 1704:e584e946e198
move condition declarations inside blocks where they are used
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Mon, 10 Dec 2007 12:09:51 +0000 |
| parents | 4c43e25d11ea |
| children | db07cb9d1cbc |
| 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 | |
| 1388 | 14 #if (NGX_PCRE) |
| 15 | |
| 16 typedef struct { | |
| 17 ngx_regex_t *regex; | |
| 18 ngx_str_t name; | |
| 19 } ngx_http_referer_regex_t; | |
| 20 | |
| 21 #else | |
| 22 | |
| 23 #define ngx_regex_t void | |
| 24 | |
| 25 #endif | |
| 26 | |
| 27 | |
| 577 | 28 typedef struct { |
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29 ngx_hash_combined_t hash; |
| 577 | 30 |
| 1388 | 31 #if (NGX_PCRE) |
| 32 ngx_array_t *regex; | |
| 33 #endif | |
| 34 | |
| 593 | 35 ngx_flag_t no_referer; |
| 36 ngx_flag_t blocked_referer; | |
| 577 | 37 |
| 593 | 38 ngx_hash_keys_arrays_t *keys; |
| 577 | 39 } ngx_http_referer_conf_t; |
| 40 | |
| 41 | |
| 42 static void * ngx_http_referer_create_conf(ngx_conf_t *cf); | |
| 43 static char * ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, | |
| 44 void *child); | |
| 45 static char *ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 46 void *conf); | |
| 593 | 47 static char *ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys, |
| 595 | 48 ngx_str_t *value, ngx_str_t *uri); |
| 1388 | 49 static char *ngx_http_add_regex_referer(ngx_conf_t *cf, |
| 50 ngx_http_referer_conf_t *rlcf, ngx_str_t *name, ngx_regex_t *regex); | |
| 593 | 51 static int ngx_libc_cdecl ngx_http_cmp_referer_wildcards(const void *one, |
| 52 const void *two); | |
| 577 | 53 |
| 54 | |
| 55 static ngx_command_t ngx_http_referer_commands[] = { | |
| 56 | |
| 57 { ngx_string("valid_referers"), | |
| 58 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, | |
| 59 ngx_http_valid_referers, | |
| 60 NGX_HTTP_LOC_CONF_OFFSET, | |
| 61 0, | |
| 62 NULL }, | |
| 63 | |
| 64 ngx_null_command | |
| 65 }; | |
| 66 | |
| 67 | |
| 68 static ngx_http_module_t ngx_http_referer_module_ctx = { | |
| 69 NULL, /* preconfiguration */ | |
| 70 NULL, /* postconfiguration */ | |
| 71 | |
| 72 NULL, /* create main configuration */ | |
| 73 NULL, /* init main configuration */ | |
| 74 | |
| 75 NULL, /* create server configuration */ | |
| 76 NULL, /* merge server configuration */ | |
| 77 | |
| 78 ngx_http_referer_create_conf, /* create location configuration */ | |
| 79 ngx_http_referer_merge_conf /* merge location configuration */ | |
| 80 }; | |
| 81 | |
| 82 | |
| 83 ngx_module_t ngx_http_referer_module = { | |
| 84 NGX_MODULE_V1, | |
| 85 &ngx_http_referer_module_ctx, /* module context */ | |
| 86 ngx_http_referer_commands, /* module directives */ | |
| 87 NGX_HTTP_MODULE, /* module type */ | |
| 88 NULL, /* init master */ | |
| 89 NULL, /* init module */ | |
| 90 NULL, /* init process */ | |
| 91 NULL, /* init thread */ | |
| 92 NULL, /* exit thread */ | |
| 93 NULL, /* exit process */ | |
| 94 NULL, /* exit master */ | |
| 95 NGX_MODULE_V1_PADDING | |
| 96 }; | |
| 97 | |
| 98 | |
| 99 static ngx_int_t | |
| 100 ngx_http_referer_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, | |
| 101 uintptr_t data) | |
| 102 { | |
| 1388 | 103 u_char *p, *ref, *last; |
| 104 size_t len; | |
| 105 ngx_str_t *uri; | |
| 106 ngx_uint_t i, key; | |
| 107 ngx_http_referer_conf_t *rlcf; | |
| 108 u_char buf[256]; | |
| 577 | 109 |
| 593 | 110 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_referer_module); |
| 577 | 111 |
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112 if (rlcf->hash.hash.buckets == NULL |
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113 && rlcf->hash.wc_head == NULL |
| 1388 | 114 && rlcf->hash.wc_tail == NULL |
| 115 #if (NGX_PCRE) | |
| 116 && rlcf->regex == NULL | |
| 117 #endif | |
| 118 ) | |
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119 { |
| 595 | 120 goto valid; |
| 577 | 121 } |
| 122 | |
| 123 if (r->headers_in.referer == NULL) { | |
| 593 | 124 if (rlcf->no_referer) { |
| 595 | 125 goto valid; |
| 126 } | |
| 577 | 127 |
| 595 | 128 goto invalid; |
| 577 | 129 } |
| 130 | |
| 131 len = r->headers_in.referer->value.len; | |
| 132 ref = r->headers_in.referer->value.data; | |
| 133 | |
| 134 if (len < sizeof("http://i.ru") - 1 | |
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135 || (ngx_strncasecmp(ref, (u_char *) "http://", 7) != 0)) |
| 577 | 136 { |
| 593 | 137 if (rlcf->blocked_referer) { |
| 595 | 138 goto valid; |
| 139 } | |
| 577 | 140 |
| 595 | 141 goto invalid; |
| 577 | 142 } |
| 143 | |
| 595 | 144 last = ref + len; |
| 577 | 145 ref += 7; |
| 595 | 146 i = 0; |
| 147 key = 0; | |
| 577 | 148 |
| 595 | 149 for (p = ref; p < last; p++) { |
| 593 | 150 if (*p == '/' || *p == ':') { |
| 151 break; | |
| 577 | 152 } |
| 595 | 153 |
| 154 buf[i] = ngx_tolower(*p); | |
| 155 key = ngx_hash(key, buf[i++]); | |
| 156 | |
| 157 if (i == 256) { | |
| 158 goto invalid; | |
| 159 } | |
| 593 | 160 } |
| 577 | 161 |
| 1388 | 162 uri = ngx_hash_find_combined(&rlcf->hash, key, buf, p - ref); |
| 577 | 163 |
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164 if (uri) { |
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165 goto uri; |
| 577 | 166 } |
| 167 | |
| 1388 | 168 #if (NGX_PCRE) |
| 169 | |
| 170 if (rlcf->regex) { | |
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move condition declarations inside blocks where they are used
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parents:
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171 ngx_int_t n; |
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172 ngx_str_t referer; |
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173 ngx_http_referer_regex_t *regex; |
| 1388 | 174 |
| 175 referer.len = len - 7; | |
| 176 referer.data = ref; | |
| 177 | |
| 178 regex = rlcf->regex->elts; | |
| 179 | |
| 180 for (i = 0; i < rlcf->regex->nelts; i++) { | |
| 181 n = ngx_regex_exec(regex[i].regex, &referer, NULL, 0); | |
| 182 | |
| 183 if (n == NGX_REGEX_NO_MATCHED) { | |
| 184 continue; | |
| 185 } | |
| 186 | |
| 187 if (n < 0) { | |
| 188 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, | |
| 189 ngx_regex_exec_n | |
| 190 " failed: %d on \"%V\" using \"%V\"", | |
| 191 n, &referer, ®ex[i].name); | |
| 192 return NGX_ERROR; | |
| 193 } | |
| 194 | |
| 195 /* match */ | |
| 196 | |
| 197 goto valid; | |
| 198 } | |
| 199 } | |
| 200 | |
| 201 #endif | |
| 202 | |
| 595 | 203 invalid: |
| 204 | |
| 577 | 205 *v = ngx_http_variable_true_value; |
| 206 | |
| 207 return NGX_OK; | |
| 595 | 208 |
| 209 uri: | |
| 210 | |
| 211 for ( /* void */ ; p < last; p++) { | |
| 212 if (*p == '/') { | |
| 213 break; | |
| 214 } | |
| 215 } | |
| 216 | |
| 217 len = last - p; | |
| 218 | |
| 219 if (uri == NGX_HTTP_REFERER_NO_URI_PART) { | |
| 220 goto valid; | |
| 221 } | |
| 222 | |
| 223 if (len < uri->len || ngx_strncmp(uri->data, p, uri->len) != 0) { | |
| 224 goto invalid; | |
| 225 } | |
| 226 | |
| 227 valid: | |
| 228 | |
| 229 *v = ngx_http_variable_null_value; | |
| 230 | |
| 231 return NGX_OK; | |
| 577 | 232 } |
| 233 | |
| 234 | |
| 235 static void * | |
| 236 ngx_http_referer_create_conf(ngx_conf_t *cf) | |
| 237 { | |
| 238 ngx_http_referer_conf_t *conf; | |
| 239 | |
| 593 | 240 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_referer_conf_t)); |
| 577 | 241 if (conf == NULL) { |
| 242 return NGX_CONF_ERROR; | |
| 243 } | |
| 244 | |
| 245 conf->no_referer = NGX_CONF_UNSET; | |
| 246 conf->blocked_referer = NGX_CONF_UNSET; | |
| 247 | |
| 248 return conf; | |
| 249 } | |
| 250 | |
| 251 | |
| 252 static char * | |
| 253 ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 254 { | |
| 255 ngx_http_referer_conf_t *prev = parent; | |
| 256 ngx_http_referer_conf_t *conf = child; | |
| 257 | |
| 593 | 258 ngx_hash_init_t hash; |
| 259 | |
| 260 if (conf->keys == NULL) { | |
| 261 conf->hash = prev->hash; | |
| 262 | |
| 577 | 263 ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0); |
| 264 ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0); | |
| 593 | 265 |
| 266 return NGX_CONF_OK; | |
| 267 } | |
| 268 | |
| 603 | 269 if ((conf->no_referer == 1 || conf->blocked_referer == 1) |
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270 && conf->keys->keys.nelts == 0 |
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271 && conf->keys->dns_wc_head.nelts == 0 |
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272 && conf->keys->dns_wc_tail.nelts == 0) |
| 603 | 273 { |
| 274 ngx_log_error(NGX_LOG_EMERG, cf->log, 0, | |
| 275 "the \"none\" or \"blocked\" referers are specified " | |
| 276 "in the \"valid_referers\" directive " | |
| 277 "without any valid referer"); | |
| 278 return NGX_CONF_ERROR; | |
| 279 } | |
| 280 | |
| 593 | 281 hash.key = ngx_hash_key_lc; |
| 282 hash.max_size = 2048; /* TODO: referer_hash_max_size; */ | |
| 283 hash.bucket_size = 64; /* TODO: referer_hash_bucket_size; */ | |
| 284 hash.name = "referers_hash"; | |
| 285 hash.pool = cf->pool; | |
| 286 | |
| 287 if (conf->keys->keys.nelts) { | |
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288 hash.hash = &conf->hash.hash; |
| 593 | 289 hash.temp_pool = NULL; |
| 290 | |
| 291 if (ngx_hash_init(&hash, conf->keys->keys.elts, conf->keys->keys.nelts) | |
| 292 != NGX_OK) | |
| 293 { | |
| 294 return NGX_CONF_ERROR; | |
| 295 } | |
| 296 } | |
| 297 | |
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298 if (conf->keys->dns_wc_head.nelts) { |
| 593 | 299 |
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300 ngx_qsort(conf->keys->dns_wc_head.elts, |
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301 (size_t) conf->keys->dns_wc_head.nelts, |
| 593 | 302 sizeof(ngx_hash_key_t), |
| 303 ngx_http_cmp_referer_wildcards); | |
| 304 | |
| 305 hash.hash = NULL; | |
| 306 hash.temp_pool = cf->temp_pool; | |
| 307 | |
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308 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_head.elts, |
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309 conf->keys->dns_wc_head.nelts) |
| 593 | 310 != NGX_OK) |
| 311 { | |
| 312 return NGX_CONF_ERROR; | |
| 313 } | |
| 314 | |
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315 conf->hash.wc_head = (ngx_hash_wildcard_t *) hash.hash; |
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316 } |
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317 |
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318 if (conf->keys->dns_wc_tail.nelts) { |
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319 |
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320 ngx_qsort(conf->keys->dns_wc_tail.elts, |
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321 (size_t) conf->keys->dns_wc_tail.nelts, |
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322 sizeof(ngx_hash_key_t), |
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323 ngx_http_cmp_referer_wildcards); |
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324 |
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325 hash.hash = NULL; |
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326 hash.temp_pool = cf->temp_pool; |
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327 |
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328 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_tail.elts, |
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329 conf->keys->dns_wc_tail.nelts) |
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330 != NGX_OK) |
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331 { |
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332 return NGX_CONF_ERROR; |
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333 } |
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334 |
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335 conf->hash.wc_tail = (ngx_hash_wildcard_t *) hash.hash; |
| 577 | 336 } |
| 337 | |
| 338 if (conf->no_referer == NGX_CONF_UNSET) { | |
| 339 conf->no_referer = 0; | |
| 340 } | |
| 341 | |
| 342 if (conf->blocked_referer == NGX_CONF_UNSET) { | |
| 343 conf->blocked_referer = 0; | |
| 344 } | |
| 345 | |
| 611 | 346 conf->keys = NULL; |
| 347 | |
| 577 | 348 return NGX_CONF_OK; |
| 349 } | |
| 350 | |
| 351 | |
| 352 static char * | |
| 353 ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 354 { | |
| 593 | 355 ngx_http_referer_conf_t *rlcf = conf; |
| 577 | 356 |
| 593 | 357 u_char *p; |
| 595 | 358 ngx_str_t *value, uri, name; |
| 593 | 359 ngx_uint_t i, n; |
| 577 | 360 ngx_http_variable_t *var; |
| 361 ngx_http_server_name_t *sn; | |
| 362 ngx_http_core_srv_conf_t *cscf; | |
| 363 | |
| 364 name.len = sizeof("invalid_referer") - 1; | |
| 365 name.data = (u_char *) "invalid_referer"; | |
| 366 | |
| 583 | 367 var = ngx_http_add_variable(cf, &name, |
| 1565 | 368 NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOHASH); |
| 577 | 369 if (var == NULL) { |
| 370 return NGX_CONF_ERROR; | |
| 371 } | |
| 372 | |
| 637 | 373 var->get_handler = ngx_http_referer_variable; |
| 577 | 374 |
| 593 | 375 if (rlcf->keys == NULL) { |
| 376 rlcf->keys = ngx_pcalloc(cf->temp_pool, sizeof(ngx_hash_keys_arrays_t)); | |
| 377 if (rlcf->keys == NULL) { | |
| 378 return NGX_CONF_ERROR; | |
| 379 } | |
| 577 | 380 |
| 593 | 381 rlcf->keys->pool = cf->pool; |
| 382 rlcf->keys->temp_pool = cf->pool; | |
| 383 | |
| 384 if (ngx_hash_keys_array_init(rlcf->keys, NGX_HASH_SMALL) != NGX_OK) { | |
| 577 | 385 return NGX_CONF_ERROR; |
| 386 } | |
| 387 } | |
| 388 | |
| 389 value = cf->args->elts; | |
| 390 | |
| 391 for (i = 1; i < cf->args->nelts; i++) { | |
| 392 if (value[i].len == 0) { | |
| 393 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 394 "invalid referer \"%V\"", &value[i]); | |
| 395 return NGX_CONF_ERROR; | |
| 396 } | |
| 397 | |
| 398 if (ngx_strcmp(value[i].data, "none") == 0) { | |
| 593 | 399 rlcf->no_referer = 1; |
| 577 | 400 continue; |
| 401 } | |
| 402 | |
| 403 if (ngx_strcmp(value[i].data, "blocked") == 0) { | |
| 593 | 404 rlcf->blocked_referer = 1; |
| 577 | 405 continue; |
| 406 } | |
| 407 | |
| 595 | 408 uri.len = 0; |
| 613 | 409 uri.data = NULL; |
| 595 | 410 |
| 577 | 411 if (ngx_strcmp(value[i].data, "server_names") == 0) { |
| 593 | 412 |
| 413 cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module); | |
| 577 | 414 |
| 593 | 415 sn = cscf->server_names.elts; |
| 416 for (n = 0; n < cscf->server_names.nelts; n++) { | |
| 1388 | 417 |
| 418 #if (NGX_PCRE) | |
| 419 if (sn[n].regex) { | |
| 420 | |
| 421 if (ngx_http_add_regex_referer(cf, rlcf, &sn[n].name, | |
| 422 sn[n].regex) | |
| 423 != NGX_OK) | |
| 424 { | |
| 425 return NGX_CONF_ERROR; | |
| 426 } | |
| 427 | |
| 428 continue; | |
| 429 } | |
| 430 #endif | |
| 431 | |
| 595 | 432 if (ngx_http_add_referer(cf, rlcf->keys, &sn[n].name, &uri) |
| 433 != NGX_OK) | |
| 434 { | |
| 593 | 435 return NGX_CONF_ERROR; |
| 436 } | |
| 437 } | |
| 577 | 438 |
| 439 continue; | |
| 440 } | |
| 441 | |
| 1388 | 442 if (value[i].data[0] == '~') { |
| 443 if (ngx_http_add_regex_referer(cf, rlcf, &value[i], NULL) != NGX_OK) | |
| 444 { | |
| 445 return NGX_CONF_ERROR; | |
| 446 } | |
| 447 | |
| 448 continue; | |
| 449 } | |
| 450 | |
| 1242 | 451 p = (u_char *) ngx_strchr(value[i].data, '/'); |
| 577 | 452 |
| 593 | 453 if (p) { |
| 595 | 454 uri.len = (value[i].data + value[i].len) - p; |
| 455 uri.data = p; | |
| 593 | 456 value[i].len = p - value[i].data; |
| 577 | 457 } |
| 458 | |
| 595 | 459 if (ngx_http_add_referer(cf, rlcf->keys, &value[i], &uri) != NGX_OK) { |
| 577 | 460 return NGX_CONF_ERROR; |
| 461 } | |
| 462 } | |
| 463 | |
| 464 return NGX_CONF_OK; | |
| 465 } | |
| 593 | 466 |
| 467 | |
| 468 static char * | |
| 469 ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys, | |
| 595 | 470 ngx_str_t *value, ngx_str_t *uri) |
| 593 | 471 { |
|
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472 ngx_int_t rc; |
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473 ngx_str_t *u; |
| 593 | 474 |
| 595 | 475 if (uri->len == 0) { |
| 476 u = NGX_HTTP_REFERER_NO_URI_PART; | |
| 477 | |
| 478 } else { | |
| 479 u = ngx_palloc(cf->pool, sizeof(ngx_str_t)); | |
| 480 if (u == NULL) { | |
| 481 return NGX_CONF_ERROR; | |
| 482 } | |
| 483 | |
| 484 *u = *uri; | |
| 485 } | |
| 486 | |
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487 rc = ngx_hash_add_key(keys, value, u, NGX_HASH_WILDCARD_KEY); |
| 593 | 488 |
| 489 if (rc == NGX_OK) { | |
| 490 return NGX_CONF_OK; | |
| 491 } | |
| 492 | |
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493 if (rc == NGX_DECLINED) { |
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494 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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495 "invalid hostname or wildcard \"%V\"", value); |
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496 } |
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497 |
| 593 | 498 if (rc == NGX_BUSY) { |
| 499 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 500 "conflicting parameter \"%V\"", value); | |
| 501 } | |
| 502 | |
| 503 return NGX_CONF_ERROR; | |
| 504 } | |
| 505 | |
| 506 | |
| 1388 | 507 static char * |
| 508 ngx_http_add_regex_referer(ngx_conf_t *cf, ngx_http_referer_conf_t *rlcf, | |
| 509 ngx_str_t *name, ngx_regex_t *regex) | |
| 510 { | |
| 511 #if (NGX_PCRE) | |
| 512 ngx_str_t err; | |
| 513 ngx_http_referer_regex_t *rr; | |
| 514 u_char errstr[NGX_MAX_CONF_ERRSTR]; | |
| 515 | |
| 516 if (rlcf->regex == NULL) { | |
| 517 rlcf->regex = ngx_array_create(cf->pool, 2, | |
| 518 sizeof(ngx_http_referer_regex_t)); | |
| 519 if (rlcf->regex == NULL) { | |
| 520 return NGX_CONF_ERROR; | |
| 521 } | |
| 522 } | |
| 523 | |
| 524 rr = ngx_array_push(rlcf->regex); | |
| 525 if (rr == NULL) { | |
| 526 return NGX_CONF_ERROR; | |
| 527 } | |
| 528 | |
| 529 if (regex) { | |
| 530 rr->regex = regex; | |
| 531 rr->name = *name; | |
| 532 | |
| 533 return NGX_CONF_OK; | |
| 534 } | |
| 535 | |
| 536 err.len = NGX_MAX_CONF_ERRSTR; | |
| 537 err.data = errstr; | |
| 538 | |
| 539 name->len--; | |
| 540 name->data++; | |
| 541 | |
| 542 rr->regex = ngx_regex_compile(name, NGX_REGEX_CASELESS, cf->pool, &err); | |
| 543 | |
| 544 if (rr->regex == NULL) { | |
| 545 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s", err.data); | |
| 546 return NGX_CONF_ERROR; | |
| 547 } | |
| 548 | |
| 549 rr->name = *name; | |
| 550 | |
| 551 return NGX_CONF_OK; | |
| 552 | |
| 553 #else | |
| 554 | |
| 555 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 556 "the using of the regex \"%V\" requires PCRE library", | |
| 557 name); | |
| 558 | |
| 559 return NGX_CONF_ERROR; | |
| 560 | |
| 561 #endif | |
| 562 } | |
| 563 | |
| 564 | |
| 593 | 565 static int ngx_libc_cdecl |
| 566 ngx_http_cmp_referer_wildcards(const void *one, const void *two) | |
| 567 { | |
| 568 ngx_hash_key_t *first, *second; | |
| 569 | |
| 570 first = (ngx_hash_key_t *) one; | |
| 571 second = (ngx_hash_key_t *) two; | |
| 572 | |
| 573 return ngx_strcmp(first->key.data, second->key.data); | |
| 574 } |