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comparison src/http/modules/ngx_http_referer_module.c @ 126:df17fbafec8f NGINX_0_3_10

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nginx 0.3.10 *) Change: the "valid_referers" directive and the "$invalid_referer" variable were moved to the new ngx_http_referer_module from the ngx_http_rewrite_module. *) Change: the "$apache_bytes_sent" variable name was changed to "$body_bytes_sent". *) Feature: the "$sent_http_..." variables. *) Feature: the "if" directive supports the "=" and "!=" operations. *) Feature: the "proxy_pass" directive supports the HTTPS protocol. *) Feature: the "proxy_set_body" directive. *) Feature: the "post_action" directive. *) Feature: the ngx_http_empty_gif_module. *) Feature: the "worker_cpu_affinity" directive for Linux. *) Bugfix: the "rewrite" directive did not unescape URI part in redirect, now it is unescaped except the %00-%25 and %7F-%FF characters. *) Bugfix: nginx could not be built by the icc 9.0 compiler. *) Bugfix: if the SSI was enabled for zero size static file, then the chunked response was encoded incorrectly.
author Igor Sysoev <http://sysoev.ru>
date Tue, 15 Nov 2005 00:00:00 +0300
parents
children 91372f004adf
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125:97504de1f89e 126:df17fbafec8f
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
12 typedef struct {
13 ngx_str_t name;
14 ngx_uint_t wildcard;
15 } ngx_http_referer_t;
16
17 typedef struct {
18 ngx_array_t *referers; /* ngx_http_referer_t */
19
20 ngx_flag_t no_referer;
21 ngx_flag_t blocked_referer;
22 } ngx_http_referer_conf_t;
23
24
25 static void * ngx_http_referer_create_conf(ngx_conf_t *cf);
26 static char * ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent,
27 void *child);
28 static char *ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd,
29 void *conf);
30
31
32 static ngx_command_t ngx_http_referer_commands[] = {
33
34 { ngx_string("valid_referers"),
35 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
36 ngx_http_valid_referers,
37 NGX_HTTP_LOC_CONF_OFFSET,
38 0,
39 NULL },
40
41 ngx_null_command
42 };
43
44
45 static ngx_http_module_t ngx_http_referer_module_ctx = {
46 NULL, /* preconfiguration */
47 NULL, /* postconfiguration */
48
49 NULL, /* create main configuration */
50 NULL, /* init main configuration */
51
52 NULL, /* create server configuration */
53 NULL, /* merge server configuration */
54
55 ngx_http_referer_create_conf, /* create location configuration */
56 ngx_http_referer_merge_conf /* merge location configuration */
57 };
58
59
60 ngx_module_t ngx_http_referer_module = {
61 NGX_MODULE_V1,
62 &ngx_http_referer_module_ctx, /* module context */
63 ngx_http_referer_commands, /* module directives */
64 NGX_HTTP_MODULE, /* module type */
65 NULL, /* init master */
66 NULL, /* init module */
67 NULL, /* init process */
68 NULL, /* init thread */
69 NULL, /* exit thread */
70 NULL, /* exit process */
71 NULL, /* exit master */
72 NGX_MODULE_V1_PADDING
73 };
74
75
76 static ngx_int_t
77 ngx_http_referer_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
78 uintptr_t data)
79 {
80 u_char *ref;
81 size_t len;
82 ngx_uint_t i, n;
83 ngx_http_referer_t *refs;
84 ngx_http_referer_conf_t *cf;
85
86 cf = ngx_http_get_module_loc_conf(r, ngx_http_referer_module);
87
88 if (cf->referers == NULL) {
89 *v = ngx_http_variable_null_value;
90 return NGX_OK;
91 }
92
93 if (r->headers_in.referer == NULL) {
94 if (cf->no_referer) {
95 *v = ngx_http_variable_null_value;
96 return NGX_OK;
97
98 } else {
99 *v = ngx_http_variable_true_value;
100 return NGX_OK;
101 }
102 }
103
104 len = r->headers_in.referer->value.len;
105 ref = r->headers_in.referer->value.data;
106
107 if (len < sizeof("http://i.ru") - 1
108 || (ngx_strncasecmp(ref, "http://", 7) != 0))
109 {
110 if (cf->blocked_referer) {
111 *v = ngx_http_variable_null_value;
112 return NGX_OK;
113
114 } else {
115 *v = ngx_http_variable_true_value;
116 return NGX_OK;
117 }
118 }
119
120 len -= 7;
121 ref += 7;
122
123 refs = cf->referers->elts;
124 for (i = 0; i < cf->referers->nelts; i++ ){
125
126 if (refs[i].name.len > len) {
127 continue;
128 }
129
130 if (refs[i].wildcard) {
131 for (n = 0; n < len; n++) {
132 if (ref[n] == '/' || ref[n] == ':') {
133 break;
134 }
135
136 if (ref[n] != '.') {
137 continue;
138 }
139
140 if (ngx_strncmp(&ref[n], refs[i].name.data,
141 refs[i].name.len) == 0)
142 {
143 *v = ngx_http_variable_null_value;
144 return NGX_OK;
145 }
146 }
147
148 } else {
149 if (ngx_strncasecmp(refs[i].name.data, ref, refs[i].name.len) == 0)
150 {
151 *v = ngx_http_variable_null_value;
152 return NGX_OK;
153 }
154 }
155 }
156
157 *v = ngx_http_variable_true_value;
158
159 return NGX_OK;
160 }
161
162
163 static void *
164 ngx_http_referer_create_conf(ngx_conf_t *cf)
165 {
166 ngx_http_referer_conf_t *conf;
167
168 conf = ngx_palloc(cf->pool, sizeof(ngx_http_referer_conf_t));
169 if (conf == NULL) {
170 return NGX_CONF_ERROR;
171 }
172
173 conf->referers = NULL;
174 conf->no_referer = NGX_CONF_UNSET;
175 conf->blocked_referer = NGX_CONF_UNSET;
176
177 return conf;
178 }
179
180
181 static char *
182 ngx_http_referer_merge_conf(ngx_conf_t *cf, void *parent, void *child)
183 {
184 ngx_http_referer_conf_t *prev = parent;
185 ngx_http_referer_conf_t *conf = child;
186
187 if (conf->referers == NULL) {
188 conf->referers = prev->referers;
189 ngx_conf_merge_value(conf->no_referer, prev->no_referer, 0);
190 ngx_conf_merge_value(conf->blocked_referer, prev->blocked_referer, 0);
191 }
192
193 if (conf->no_referer == NGX_CONF_UNSET) {
194 conf->no_referer = 0;
195 }
196
197 if (conf->blocked_referer == NGX_CONF_UNSET) {
198 conf->blocked_referer = 0;
199 }
200
201 return NGX_CONF_OK;
202 }
203
204
205 static char *
206 ngx_http_valid_referers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
207 {
208 ngx_http_referer_conf_t *lcf = conf;
209
210 ngx_uint_t i, server_names;
211 ngx_str_t *value, name;
212 ngx_http_referer_t *ref;
213 ngx_http_variable_t *var;
214 ngx_http_server_name_t *sn;
215 ngx_http_core_srv_conf_t *cscf;
216
217 name.len = sizeof("invalid_referer") - 1;
218 name.data = (u_char *) "invalid_referer";
219
220 var = ngx_http_add_variable(cf, &name, NGX_HTTP_VAR_CHANGABLE);
221 if (var == NULL) {
222 return NGX_CONF_ERROR;
223 }
224
225 var->handler = ngx_http_referer_variable;
226
227 cscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_core_module);
228
229 if (lcf->referers == NULL) {
230 lcf->referers = ngx_array_create(cf->pool,
231 cf->args->nelts + cscf->server_names.nelts,
232 sizeof(ngx_http_referer_t));
233 if (lcf->referers == NULL) {
234 return NGX_CONF_ERROR;
235 }
236 }
237
238 value = cf->args->elts;
239 server_names = 0;
240
241 for (i = 1; i < cf->args->nelts; i++) {
242 if (value[i].len == 0) {
243 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
244 "invalid referer \"%V\"", &value[i]);
245 return NGX_CONF_ERROR;
246 }
247
248 if (ngx_strcmp(value[i].data, "none") == 0) {
249 lcf->no_referer = 1;
250 continue;
251 }
252
253 if (ngx_strcmp(value[i].data, "blocked") == 0) {
254 lcf->blocked_referer = 1;
255 continue;
256 }
257
258 if (ngx_strcmp(value[i].data, "server_names") == 0) {
259 server_names = 1;
260 continue;
261 }
262
263 ref = ngx_array_push(lcf->referers);
264 if (ref == NULL) {
265 return NGX_CONF_ERROR;
266 }
267
268 if (value[i].data[0] != '*') {
269 ref->name = value[i];
270 ref->wildcard = 0;
271 continue;
272 }
273
274
275 if (value[i].data[1] != '.') {
276 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
277 "invalid wildcard referer \"%V\"", &value[i]);
278 return NGX_CONF_ERROR;
279 }
280
281 ref->name.len = value[i].len - 1;
282 ref->name.data = value[i].data + 1;
283 ref->wildcard = 1;
284 }
285
286 if (!server_names) {
287 return NGX_CONF_OK;
288 }
289
290 sn = cscf->server_names.elts;
291 for (i = 0; i < cscf->server_names.nelts; i++) {
292 ref = ngx_array_push(lcf->referers);
293 if (ref == NULL) {
294 return NGX_CONF_ERROR;
295 }
296
297 ref->name.len = sn[i].name.len + 1;
298 ref->name.data = ngx_palloc(cf->pool, ref->name.len);
299 if (ref->name.data == NULL) {
300 return NGX_CONF_ERROR;
301 }
302
303 ngx_memcpy(ref->name.data, sn[i].name.data, sn[i].name.len);
304 ref->name.data[sn[i].name.len] = '/';
305 ref->wildcard = sn[i].wildcard;
306 }
307
308 return NGX_CONF_OK;
309 }