Mercurial > hg > nginx
annotate src/http/modules/ngx_http_referer_module.c @ 1253:8ef04207c84f
the "www.example.*" wildcard hash support
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Mon, 11 Jun 2007 19:49:22 +0000 |
| parents | ae555e0549ca |
| children | 92bc89c5ff0f |
| 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 | |
| 577 | 14 typedef struct { |
|
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15 ngx_hash_combined_t hash; |
| 577 | 16 |
| 593 | 17 ngx_flag_t no_referer; |
| 18 ngx_flag_t blocked_referer; | |
| 577 | 19 |
| 593 | 20 ngx_hash_keys_arrays_t *keys; |
| 577 | 21 } ngx_http_referer_conf_t; |
| 22 | |
| 23 | |
| 24 static void * ngx_http_referer_create_conf(ngx_conf_t *cf); | |
| 25 static char * ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, | |
| 26 void *child); | |
| 27 static char *ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 28 void *conf); | |
| 593 | 29 static char *ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys, |
| 595 | 30 ngx_str_t *value, ngx_str_t *uri); |
| 593 | 31 static int ngx_libc_cdecl ngx_http_cmp_referer_wildcards(const void *one, |
| 32 const void *two); | |
| 577 | 33 |
| 34 | |
| 35 static ngx_command_t ngx_http_referer_commands[] = { | |
| 36 | |
| 37 { ngx_string("valid_referers"), | |
| 38 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, | |
| 39 ngx_http_valid_referers, | |
| 40 NGX_HTTP_LOC_CONF_OFFSET, | |
| 41 0, | |
| 42 NULL }, | |
| 43 | |
| 44 ngx_null_command | |
| 45 }; | |
| 46 | |
| 47 | |
| 48 static ngx_http_module_t ngx_http_referer_module_ctx = { | |
| 49 NULL, /* preconfiguration */ | |
| 50 NULL, /* postconfiguration */ | |
| 51 | |
| 52 NULL, /* create main configuration */ | |
| 53 NULL, /* init main configuration */ | |
| 54 | |
| 55 NULL, /* create server configuration */ | |
| 56 NULL, /* merge server configuration */ | |
| 57 | |
| 58 ngx_http_referer_create_conf, /* create location configuration */ | |
| 59 ngx_http_referer_merge_conf /* merge location configuration */ | |
| 60 }; | |
| 61 | |
| 62 | |
| 63 ngx_module_t ngx_http_referer_module = { | |
| 64 NGX_MODULE_V1, | |
| 65 &ngx_http_referer_module_ctx, /* module context */ | |
| 66 ngx_http_referer_commands, /* module directives */ | |
| 67 NGX_HTTP_MODULE, /* module type */ | |
| 68 NULL, /* init master */ | |
| 69 NULL, /* init module */ | |
| 70 NULL, /* init process */ | |
| 71 NULL, /* init thread */ | |
| 72 NULL, /* exit thread */ | |
| 73 NULL, /* exit process */ | |
| 74 NULL, /* exit master */ | |
| 75 NGX_MODULE_V1_PADDING | |
| 76 }; | |
| 77 | |
| 78 | |
| 79 static ngx_int_t | |
| 80 ngx_http_referer_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, | |
| 81 uintptr_t data) | |
| 82 { | |
| 595 | 83 u_char *p, *ref, *last; |
| 593 | 84 size_t len; |
| 595 | 85 ngx_str_t *uri; |
| 86 ngx_uint_t i, key; | |
| 593 | 87 ngx_http_referer_conf_t *rlcf; |
| 595 | 88 u_char buf[256]; |
| 577 | 89 |
| 593 | 90 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_referer_module); |
| 577 | 91 |
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92 if (rlcf->hash.hash.buckets == NULL |
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93 && rlcf->hash.wc_head == NULL |
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94 && rlcf->hash.wc_tail == NULL) |
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95 { |
| 595 | 96 goto valid; |
| 577 | 97 } |
| 98 | |
| 99 if (r->headers_in.referer == NULL) { | |
| 593 | 100 if (rlcf->no_referer) { |
| 595 | 101 goto valid; |
| 102 } | |
| 577 | 103 |
| 595 | 104 goto invalid; |
| 577 | 105 } |
| 106 | |
| 107 len = r->headers_in.referer->value.len; | |
| 108 ref = r->headers_in.referer->value.data; | |
| 109 | |
| 110 if (len < sizeof("http://i.ru") - 1 | |
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111 || (ngx_strncasecmp(ref, (u_char *) "http://", 7) != 0)) |
| 577 | 112 { |
| 593 | 113 if (rlcf->blocked_referer) { |
| 595 | 114 goto valid; |
| 115 } | |
| 577 | 116 |
| 595 | 117 goto invalid; |
| 577 | 118 } |
| 119 | |
| 595 | 120 last = ref + len; |
| 577 | 121 ref += 7; |
| 595 | 122 i = 0; |
| 123 key = 0; | |
| 577 | 124 |
| 595 | 125 for (p = ref; p < last; p++) { |
| 593 | 126 if (*p == '/' || *p == ':') { |
| 127 break; | |
| 577 | 128 } |
| 595 | 129 |
| 130 buf[i] = ngx_tolower(*p); | |
| 131 key = ngx_hash(key, buf[i++]); | |
| 132 | |
| 133 if (i == 256) { | |
| 134 goto invalid; | |
| 135 } | |
| 593 | 136 } |
| 577 | 137 |
| 593 | 138 len = p - ref; |
| 577 | 139 |
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140 uri = ngx_hash_find_combined(&rlcf->hash, key, buf, len); |
| 577 | 141 |
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142 if (uri) { |
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143 goto uri; |
| 577 | 144 } |
| 145 | |
| 595 | 146 invalid: |
| 147 | |
| 577 | 148 *v = ngx_http_variable_true_value; |
| 149 | |
| 150 return NGX_OK; | |
| 595 | 151 |
| 152 uri: | |
| 153 | |
| 154 for ( /* void */ ; p < last; p++) { | |
| 155 if (*p == '/') { | |
| 156 break; | |
| 157 } | |
| 158 } | |
| 159 | |
| 160 len = last - p; | |
| 161 | |
| 162 if (uri == NGX_HTTP_REFERER_NO_URI_PART) { | |
| 163 goto valid; | |
| 164 } | |
| 165 | |
| 166 if (len < uri->len || ngx_strncmp(uri->data, p, uri->len) != 0) { | |
| 167 goto invalid; | |
| 168 } | |
| 169 | |
| 170 valid: | |
| 171 | |
| 172 *v = ngx_http_variable_null_value; | |
| 173 | |
| 174 return NGX_OK; | |
| 577 | 175 } |
| 176 | |
| 177 | |
| 178 static void * | |
| 179 ngx_http_referer_create_conf(ngx_conf_t *cf) | |
| 180 { | |
| 181 ngx_http_referer_conf_t *conf; | |
| 182 | |
| 593 | 183 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_referer_conf_t)); |
| 577 | 184 if (conf == NULL) { |
| 185 return NGX_CONF_ERROR; | |
| 186 } | |
| 187 | |
| 188 conf->no_referer = NGX_CONF_UNSET; | |
| 189 conf->blocked_referer = NGX_CONF_UNSET; | |
| 190 | |
| 191 return conf; | |
| 192 } | |
| 193 | |
| 194 | |
| 195 static char * | |
| 196 ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 197 { | |
| 198 ngx_http_referer_conf_t *prev = parent; | |
| 199 ngx_http_referer_conf_t *conf = child; | |
| 200 | |
| 593 | 201 ngx_hash_init_t hash; |
| 202 | |
| 203 if (conf->keys == NULL) { | |
| 204 conf->hash = prev->hash; | |
| 205 | |
| 577 | 206 ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0); |
| 207 ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0); | |
| 593 | 208 |
| 209 return NGX_CONF_OK; | |
| 210 } | |
| 211 | |
| 603 | 212 if ((conf->no_referer == 1 || conf->blocked_referer == 1) |
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213 && conf->keys->keys.nelts == 0 |
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214 && conf->keys->dns_wc_head.nelts == 0 |
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215 && conf->keys->dns_wc_tail.nelts == 0) |
| 603 | 216 { |
| 217 ngx_log_error(NGX_LOG_EMERG, cf->log, 0, | |
| 218 "the \"none\" or \"blocked\" referers are specified " | |
| 219 "in the \"valid_referers\" directive " | |
| 220 "without any valid referer"); | |
| 221 return NGX_CONF_ERROR; | |
| 222 } | |
| 223 | |
| 593 | 224 hash.key = ngx_hash_key_lc; |
| 225 hash.max_size = 2048; /* TODO: referer_hash_max_size; */ | |
| 226 hash.bucket_size = 64; /* TODO: referer_hash_bucket_size; */ | |
| 227 hash.name = "referers_hash"; | |
| 228 hash.pool = cf->pool; | |
| 229 | |
| 230 if (conf->keys->keys.nelts) { | |
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231 hash.hash = &conf->hash.hash; |
| 593 | 232 hash.temp_pool = NULL; |
| 233 | |
| 234 if (ngx_hash_init(&hash, conf->keys->keys.elts, conf->keys->keys.nelts) | |
| 235 != NGX_OK) | |
| 236 { | |
| 237 return NGX_CONF_ERROR; | |
| 238 } | |
| 239 } | |
| 240 | |
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241 if (conf->keys->dns_wc_head.nelts) { |
| 593 | 242 |
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243 ngx_qsort(conf->keys->dns_wc_head.elts, |
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244 (size_t) conf->keys->dns_wc_head.nelts, |
| 593 | 245 sizeof(ngx_hash_key_t), |
| 246 ngx_http_cmp_referer_wildcards); | |
| 247 | |
| 248 hash.hash = NULL; | |
| 249 hash.temp_pool = cf->temp_pool; | |
| 250 | |
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251 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_head.elts, |
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252 conf->keys->dns_wc_head.nelts) |
| 593 | 253 != NGX_OK) |
| 254 { | |
| 255 return NGX_CONF_ERROR; | |
| 256 } | |
| 257 | |
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258 conf->hash.wc_head = (ngx_hash_wildcard_t *) hash.hash; |
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259 } |
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260 |
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261 if (conf->keys->dns_wc_tail.nelts) { |
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262 |
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263 ngx_qsort(conf->keys->dns_wc_tail.elts, |
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264 (size_t) conf->keys->dns_wc_tail.nelts, |
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265 sizeof(ngx_hash_key_t), |
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266 ngx_http_cmp_referer_wildcards); |
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267 |
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268 hash.hash = NULL; |
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269 hash.temp_pool = cf->temp_pool; |
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270 |
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271 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_tail.elts, |
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272 conf->keys->dns_wc_tail.nelts) |
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273 != NGX_OK) |
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274 { |
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275 return NGX_CONF_ERROR; |
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276 } |
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277 |
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278 conf->hash.wc_tail = (ngx_hash_wildcard_t *) hash.hash; |
| 577 | 279 } |
| 280 | |
| 281 if (conf->no_referer == NGX_CONF_UNSET) { | |
| 282 conf->no_referer = 0; | |
| 283 } | |
| 284 | |
| 285 if (conf->blocked_referer == NGX_CONF_UNSET) { | |
| 286 conf->blocked_referer = 0; | |
| 287 } | |
| 288 | |
| 611 | 289 conf->keys = NULL; |
| 290 | |
| 577 | 291 return NGX_CONF_OK; |
| 292 } | |
| 293 | |
| 294 | |
| 295 static char * | |
| 296 ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 297 { | |
| 593 | 298 ngx_http_referer_conf_t *rlcf = conf; |
| 577 | 299 |
| 593 | 300 u_char *p; |
| 595 | 301 ngx_str_t *value, uri, name; |
| 593 | 302 ngx_uint_t i, n; |
| 577 | 303 ngx_http_variable_t *var; |
| 304 ngx_http_server_name_t *sn; | |
| 305 ngx_http_core_srv_conf_t *cscf; | |
| 306 | |
| 307 name.len = sizeof("invalid_referer") - 1; | |
| 308 name.data = (u_char *) "invalid_referer"; | |
| 309 | |
| 583 | 310 var = ngx_http_add_variable(cf, &name, |
| 311 NGX_HTTP_VAR_CHANGABLE|NGX_HTTP_VAR_NOHASH); | |
| 577 | 312 if (var == NULL) { |
| 313 return NGX_CONF_ERROR; | |
| 314 } | |
| 315 | |
| 637 | 316 var->get_handler = ngx_http_referer_variable; |
| 577 | 317 |
| 593 | 318 if (rlcf->keys == NULL) { |
| 319 rlcf->keys = ngx_pcalloc(cf->temp_pool, sizeof(ngx_hash_keys_arrays_t)); | |
| 320 if (rlcf->keys == NULL) { | |
| 321 return NGX_CONF_ERROR; | |
| 322 } | |
| 577 | 323 |
| 593 | 324 rlcf->keys->pool = cf->pool; |
| 325 rlcf->keys->temp_pool = cf->pool; | |
| 326 | |
| 327 if (ngx_hash_keys_array_init(rlcf->keys, NGX_HASH_SMALL) != NGX_OK) { | |
| 577 | 328 return NGX_CONF_ERROR; |
| 329 } | |
| 330 } | |
| 331 | |
| 332 value = cf->args->elts; | |
| 333 | |
| 334 for (i = 1; i < cf->args->nelts; i++) { | |
| 335 if (value[i].len == 0) { | |
| 336 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 337 "invalid referer \"%V\"", &value[i]); | |
| 338 return NGX_CONF_ERROR; | |
| 339 } | |
| 340 | |
| 341 if (ngx_strcmp(value[i].data, "none") == 0) { | |
| 593 | 342 rlcf->no_referer = 1; |
| 577 | 343 continue; |
| 344 } | |
| 345 | |
| 346 if (ngx_strcmp(value[i].data, "blocked") == 0) { | |
| 593 | 347 rlcf->blocked_referer = 1; |
| 577 | 348 continue; |
| 349 } | |
| 350 | |
| 595 | 351 uri.len = 0; |
| 613 | 352 uri.data = NULL; |
| 595 | 353 |
| 577 | 354 if (ngx_strcmp(value[i].data, "server_names") == 0) { |
| 593 | 355 |
| 356 cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module); | |
| 577 | 357 |
| 593 | 358 sn = cscf->server_names.elts; |
| 359 for (n = 0; n < cscf->server_names.nelts; n++) { | |
| 595 | 360 if (ngx_http_add_referer(cf, rlcf->keys, &sn[n].name, &uri) |
| 361 != NGX_OK) | |
| 362 { | |
| 593 | 363 return NGX_CONF_ERROR; |
| 364 } | |
| 365 } | |
| 577 | 366 |
| 367 continue; | |
| 368 } | |
| 369 | |
| 1242 | 370 p = (u_char *) ngx_strchr(value[i].data, '/'); |
| 577 | 371 |
| 593 | 372 if (p) { |
| 595 | 373 uri.len = (value[i].data + value[i].len) - p; |
| 374 uri.data = p; | |
| 593 | 375 value[i].len = p - value[i].data; |
| 577 | 376 } |
| 377 | |
| 595 | 378 if (ngx_http_add_referer(cf, rlcf->keys, &value[i], &uri) != NGX_OK) { |
| 577 | 379 return NGX_CONF_ERROR; |
| 380 } | |
| 381 } | |
| 382 | |
| 383 return NGX_CONF_OK; | |
| 384 } | |
| 593 | 385 |
| 386 | |
| 387 static char * | |
| 388 ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys, | |
| 595 | 389 ngx_str_t *value, ngx_str_t *uri) |
| 593 | 390 { |
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391 ngx_int_t rc; |
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392 ngx_str_t *u; |
| 593 | 393 |
| 595 | 394 if (uri->len == 0) { |
| 395 u = NGX_HTTP_REFERER_NO_URI_PART; | |
| 396 | |
| 397 } else { | |
| 398 u = ngx_palloc(cf->pool, sizeof(ngx_str_t)); | |
| 399 if (u == NULL) { | |
| 400 return NGX_CONF_ERROR; | |
| 401 } | |
| 402 | |
| 403 *u = *uri; | |
| 404 } | |
| 405 | |
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406 rc = ngx_hash_add_key(keys, value, u, NGX_HASH_WILDCARD_KEY); |
| 593 | 407 |
| 408 if (rc == NGX_OK) { | |
| 409 return NGX_CONF_OK; | |
| 410 } | |
| 411 | |
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412 if (rc == NGX_DECLINED) { |
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413 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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414 "invalid hostname or wildcard \"%V\"", value); |
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415 } |
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416 |
| 593 | 417 if (rc == NGX_BUSY) { |
| 418 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 419 "conflicting parameter \"%V\"", value); | |
| 420 } | |
| 421 | |
| 422 return NGX_CONF_ERROR; | |
| 423 } | |
| 424 | |
| 425 | |
| 426 static int ngx_libc_cdecl | |
| 427 ngx_http_cmp_referer_wildcards(const void *one, const void *two) | |
| 428 { | |
| 429 ngx_hash_key_t *first, *second; | |
| 430 | |
| 431 first = (ngx_hash_key_t *) one; | |
| 432 second = (ngx_hash_key_t *) two; | |
| 433 | |
| 434 return ngx_strcmp(first->key.data, second->key.data); | |
| 435 } |