Mercurial > hg > nginx
annotate src/http/modules/ngx_http_referer_module.c @ 2912:c7d57b539248
return NULL instead of NGX_CONF_ERROR on a create conf failure
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Tue, 02 Jun 2009 16:09:44 +0000 |
| parents | 3e1c695258d3 |
| children | 98e288c6dac3 616ff375a68f |
| 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) { |
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224 return NULL; |
| 577 | 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 | |
| 1800 | 249 #if (NGX_PCRE) |
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250 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL); |
| 1800 | 251 #endif |
| 577 | 252 ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0); |
| 253 ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0); | |
| 593 | 254 |
| 255 return NGX_CONF_OK; | |
| 256 } | |
| 257 | |
| 603 | 258 if ((conf->no_referer == 1 || conf->blocked_referer == 1) |
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259 && conf->keys->keys.nelts == 0 |
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260 && conf->keys->dns_wc_head.nelts == 0 |
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261 && conf->keys->dns_wc_tail.nelts == 0) |
| 603 | 262 { |
| 263 ngx_log_error(NGX_LOG_EMERG, cf->log, 0, | |
| 264 "the \"none\" or \"blocked\" referers are specified " | |
| 265 "in the \"valid_referers\" directive " | |
| 266 "without any valid referer"); | |
| 267 return NGX_CONF_ERROR; | |
| 268 } | |
| 269 | |
| 593 | 270 hash.key = ngx_hash_key_lc; |
| 271 hash.max_size = 2048; /* TODO: referer_hash_max_size; */ | |
| 272 hash.bucket_size = 64; /* TODO: referer_hash_bucket_size; */ | |
| 273 hash.name = "referers_hash"; | |
| 274 hash.pool = cf->pool; | |
| 275 | |
| 276 if (conf->keys->keys.nelts) { | |
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277 hash.hash = &conf->hash.hash; |
| 593 | 278 hash.temp_pool = NULL; |
| 279 | |
| 280 if (ngx_hash_init(&hash, conf->keys->keys.elts, conf->keys->keys.nelts) | |
| 281 != NGX_OK) | |
| 282 { | |
| 283 return NGX_CONF_ERROR; | |
| 284 } | |
| 285 } | |
| 286 | |
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287 if (conf->keys->dns_wc_head.nelts) { |
| 593 | 288 |
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289 ngx_qsort(conf->keys->dns_wc_head.elts, |
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290 (size_t) conf->keys->dns_wc_head.nelts, |
| 593 | 291 sizeof(ngx_hash_key_t), |
| 292 ngx_http_cmp_referer_wildcards); | |
| 293 | |
| 294 hash.hash = NULL; | |
| 295 hash.temp_pool = cf->temp_pool; | |
| 296 | |
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297 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_head.elts, |
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298 conf->keys->dns_wc_head.nelts) |
| 593 | 299 != NGX_OK) |
| 300 { | |
| 301 return NGX_CONF_ERROR; | |
| 302 } | |
| 303 | |
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304 conf->hash.wc_head = (ngx_hash_wildcard_t *) hash.hash; |
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305 } |
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306 |
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307 if (conf->keys->dns_wc_tail.nelts) { |
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308 |
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309 ngx_qsort(conf->keys->dns_wc_tail.elts, |
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310 (size_t) conf->keys->dns_wc_tail.nelts, |
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311 sizeof(ngx_hash_key_t), |
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312 ngx_http_cmp_referer_wildcards); |
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313 |
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314 hash.hash = NULL; |
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315 hash.temp_pool = cf->temp_pool; |
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316 |
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317 if (ngx_hash_wildcard_init(&hash, conf->keys->dns_wc_tail.elts, |
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318 conf->keys->dns_wc_tail.nelts) |
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319 != NGX_OK) |
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320 { |
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321 return NGX_CONF_ERROR; |
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322 } |
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323 |
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324 conf->hash.wc_tail = (ngx_hash_wildcard_t *) hash.hash; |
| 577 | 325 } |
| 326 | |
| 1800 | 327 #if (NGX_PCRE) |
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328 ngx_conf_merge_ptr_value(conf->regex, prev->regex, NULL); |
| 1800 | 329 #endif |
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330 |
| 577 | 331 if (conf->no_referer == NGX_CONF_UNSET) { |
| 332 conf->no_referer = 0; | |
| 333 } | |
| 334 | |
| 335 if (conf->blocked_referer == NGX_CONF_UNSET) { | |
| 336 conf->blocked_referer = 0; | |
| 337 } | |
| 338 | |
| 611 | 339 conf->keys = NULL; |
| 340 | |
| 577 | 341 return NGX_CONF_OK; |
| 342 } | |
| 343 | |
| 344 | |
| 345 static char * | |
| 346 ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 347 { | |
| 593 | 348 ngx_http_referer_conf_t *rlcf = conf; |
| 577 | 349 |
| 593 | 350 u_char *p; |
| 595 | 351 ngx_str_t *value, uri, name; |
| 593 | 352 ngx_uint_t i, n; |
| 577 | 353 ngx_http_variable_t *var; |
| 354 ngx_http_server_name_t *sn; | |
| 355 ngx_http_core_srv_conf_t *cscf; | |
| 356 | |
| 357 name.len = sizeof("invalid_referer") - 1; | |
| 358 name.data = (u_char *) "invalid_referer"; | |
| 359 | |
| 583 | 360 var = ngx_http_add_variable(cf, &name, |
| 1565 | 361 NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOHASH); |
| 577 | 362 if (var == NULL) { |
| 363 return NGX_CONF_ERROR; | |
| 364 } | |
| 365 | |
| 637 | 366 var->get_handler = ngx_http_referer_variable; |
| 577 | 367 |
| 593 | 368 if (rlcf->keys == NULL) { |
| 369 rlcf->keys = ngx_pcalloc(cf->temp_pool, sizeof(ngx_hash_keys_arrays_t)); | |
| 370 if (rlcf->keys == NULL) { | |
| 371 return NGX_CONF_ERROR; | |
| 372 } | |
| 577 | 373 |
| 593 | 374 rlcf->keys->pool = cf->pool; |
| 375 rlcf->keys->temp_pool = cf->pool; | |
| 376 | |
| 377 if (ngx_hash_keys_array_init(rlcf->keys, NGX_HASH_SMALL) != NGX_OK) { | |
| 577 | 378 return NGX_CONF_ERROR; |
| 379 } | |
| 380 } | |
| 381 | |
| 382 value = cf->args->elts; | |
| 383 | |
| 384 for (i = 1; i < cf->args->nelts; i++) { | |
| 385 if (value[i].len == 0) { | |
| 386 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 387 "invalid referer \"%V\"", &value[i]); | |
| 388 return NGX_CONF_ERROR; | |
| 389 } | |
| 390 | |
| 391 if (ngx_strcmp(value[i].data, "none") == 0) { | |
| 593 | 392 rlcf->no_referer = 1; |
| 577 | 393 continue; |
| 394 } | |
| 395 | |
| 396 if (ngx_strcmp(value[i].data, "blocked") == 0) { | |
| 593 | 397 rlcf->blocked_referer = 1; |
| 577 | 398 continue; |
| 399 } | |
| 400 | |
| 595 | 401 uri.len = 0; |
| 613 | 402 uri.data = NULL; |
| 595 | 403 |
| 577 | 404 if (ngx_strcmp(value[i].data, "server_names") == 0) { |
| 593 | 405 |
| 406 cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module); | |
| 577 | 407 |
| 593 | 408 sn = cscf->server_names.elts; |
| 409 for (n = 0; n < cscf->server_names.nelts; n++) { | |
| 1388 | 410 |
| 411 #if (NGX_PCRE) | |
| 412 if (sn[n].regex) { | |
| 413 | |
| 414 if (ngx_http_add_regex_referer(cf, rlcf, &sn[n].name, | |
| 415 sn[n].regex) | |
| 416 != NGX_OK) | |
| 417 { | |
| 418 return NGX_CONF_ERROR; | |
| 419 } | |
| 420 | |
| 421 continue; | |
| 422 } | |
| 423 #endif | |
| 424 | |
| 595 | 425 if (ngx_http_add_referer(cf, rlcf->keys, &sn[n].name, &uri) |
| 426 != NGX_OK) | |
| 427 { | |
| 593 | 428 return NGX_CONF_ERROR; |
| 429 } | |
| 430 } | |
| 577 | 431 |
| 432 continue; | |
| 433 } | |
| 434 | |
| 1388 | 435 if (value[i].data[0] == '~') { |
| 436 if (ngx_http_add_regex_referer(cf, rlcf, &value[i], NULL) != NGX_OK) | |
| 437 { | |
| 438 return NGX_CONF_ERROR; | |
| 439 } | |
| 440 | |
| 441 continue; | |
| 442 } | |
| 443 | |
| 1242 | 444 p = (u_char *) ngx_strchr(value[i].data, '/'); |
| 577 | 445 |
| 593 | 446 if (p) { |
| 595 | 447 uri.len = (value[i].data + value[i].len) - p; |
| 448 uri.data = p; | |
| 593 | 449 value[i].len = p - value[i].data; |
| 577 | 450 } |
| 451 | |
| 595 | 452 if (ngx_http_add_referer(cf, rlcf->keys, &value[i], &uri) != NGX_OK) { |
| 577 | 453 return NGX_CONF_ERROR; |
| 454 } | |
| 455 } | |
| 456 | |
| 457 return NGX_CONF_OK; | |
| 458 } | |
| 593 | 459 |
| 460 | |
| 461 static char * | |
| 462 ngx_http_add_referer(ngx_conf_t *cf, ngx_hash_keys_arrays_t *keys, | |
| 595 | 463 ngx_str_t *value, ngx_str_t *uri) |
| 593 | 464 { |
|
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465 ngx_int_t rc; |
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466 ngx_str_t *u; |
| 593 | 467 |
| 595 | 468 if (uri->len == 0) { |
| 469 u = NGX_HTTP_REFERER_NO_URI_PART; | |
| 470 | |
| 471 } else { | |
| 472 u = ngx_palloc(cf->pool, sizeof(ngx_str_t)); | |
| 473 if (u == NULL) { | |
| 474 return NGX_CONF_ERROR; | |
| 475 } | |
| 476 | |
| 477 *u = *uri; | |
| 478 } | |
| 479 | |
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480 rc = ngx_hash_add_key(keys, value, u, NGX_HASH_WILDCARD_KEY); |
| 593 | 481 |
| 482 if (rc == NGX_OK) { | |
| 483 return NGX_CONF_OK; | |
| 484 } | |
| 485 | |
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486 if (rc == NGX_DECLINED) { |
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487 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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488 "invalid hostname or wildcard \"%V\"", value); |
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489 } |
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490 |
| 593 | 491 if (rc == NGX_BUSY) { |
| 492 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 493 "conflicting parameter \"%V\"", value); | |
| 494 } | |
| 495 | |
| 496 return NGX_CONF_ERROR; | |
| 497 } | |
| 498 | |
| 499 | |
| 1388 | 500 static char * |
| 501 ngx_http_add_regex_referer(ngx_conf_t *cf, ngx_http_referer_conf_t *rlcf, | |
| 502 ngx_str_t *name, ngx_regex_t *regex) | |
| 503 { | |
| 504 #if (NGX_PCRE) | |
| 1785 | 505 ngx_str_t err; |
| 506 ngx_regex_elt_t *re; | |
| 507 u_char errstr[NGX_MAX_CONF_ERRSTR]; | |
| 1388 | 508 |
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509 if (rlcf->regex == NGX_CONF_UNSET_PTR) { |
| 1785 | 510 rlcf->regex = ngx_array_create(cf->pool, 2, sizeof(ngx_regex_elt_t)); |
| 1388 | 511 if (rlcf->regex == NULL) { |
| 512 return NGX_CONF_ERROR; | |
| 513 } | |
| 514 } | |
| 515 | |
| 1785 | 516 re = ngx_array_push(rlcf->regex); |
| 517 if (re == NULL) { | |
| 1388 | 518 return NGX_CONF_ERROR; |
| 519 } | |
| 520 | |
| 521 if (regex) { | |
| 1785 | 522 re->regex = regex; |
| 523 re->name = name->data; | |
| 1388 | 524 |
| 525 return NGX_CONF_OK; | |
| 526 } | |
| 527 | |
| 528 err.len = NGX_MAX_CONF_ERRSTR; | |
| 529 err.data = errstr; | |
| 530 | |
| 531 name->len--; | |
| 532 name->data++; | |
| 533 | |
| 1785 | 534 re->regex = ngx_regex_compile(name, NGX_REGEX_CASELESS, cf->pool, &err); |
| 1388 | 535 |
| 1785 | 536 if (re->regex == NULL) { |
| 1388 | 537 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s", err.data); |
| 538 return NGX_CONF_ERROR; | |
| 539 } | |
| 540 | |
| 1785 | 541 re->name = name->data; |
| 1388 | 542 |
| 543 return NGX_CONF_OK; | |
| 544 | |
| 545 #else | |
| 546 | |
| 547 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 548 "the using of the regex \"%V\" requires PCRE library", | |
| 549 name); | |
| 550 | |
| 551 return NGX_CONF_ERROR; | |
| 552 | |
| 553 #endif | |
| 554 } | |
| 555 | |
| 556 | |
| 593 | 557 static int ngx_libc_cdecl |
| 558 ngx_http_cmp_referer_wildcards(const void *one, const void *two) | |
| 559 { | |
| 560 ngx_hash_key_t *first, *second; | |
| 561 | |
| 562 first = (ngx_hash_key_t *) one; | |
| 563 second = (ngx_hash_key_t *) two; | |
| 564 | |
| 565 return ngx_strcmp(first->key.data, second->key.data); | |
| 566 } |