|
406
|
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_flag_t enable;
|
|
|
14 } ngx_http_random_index_loc_conf_t;
|
|
|
15
|
|
|
16
|
|
|
17 #define NGX_HTTP_RANDOM_INDEX_PREALLOCATE 50
|
|
|
18
|
|
|
19
|
|
|
20 static ngx_int_t ngx_http_random_index_error(ngx_http_request_t *r,
|
|
|
21 ngx_dir_t *dir, ngx_str_t *name);
|
|
|
22 static ngx_int_t ngx_http_random_index_init(ngx_conf_t *cf);
|
|
|
23 static void *ngx_http_random_index_create_loc_conf(ngx_conf_t *cf);
|
|
|
24 static char *ngx_http_random_index_merge_loc_conf(ngx_conf_t *cf,
|
|
|
25 void *parent, void *child);
|
|
|
26
|
|
|
27
|
|
|
28 static ngx_command_t ngx_http_random_index_commands[] = {
|
|
|
29
|
|
|
30 { ngx_string("random_index"),
|
|
|
31 NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
|
|
|
32 ngx_conf_set_flag_slot,
|
|
|
33 NGX_HTTP_LOC_CONF_OFFSET,
|
|
|
34 offsetof(ngx_http_random_index_loc_conf_t, enable),
|
|
|
35 NULL },
|
|
|
36
|
|
|
37 ngx_null_command
|
|
|
38 };
|
|
|
39
|
|
|
40
|
|
|
41 static ngx_http_module_t ngx_http_random_index_module_ctx = {
|
|
|
42 NULL, /* preconfiguration */
|
|
|
43 ngx_http_random_index_init, /* postconfiguration */
|
|
|
44
|
|
|
45 NULL, /* create main configuration */
|
|
|
46 NULL, /* init main configuration */
|
|
|
47
|
|
|
48 NULL, /* create server configuration */
|
|
|
49 NULL, /* merge server configuration */
|
|
|
50
|
|
|
51 ngx_http_random_index_create_loc_conf, /* create location configration */
|
|
|
52 ngx_http_random_index_merge_loc_conf /* merge location configration */
|
|
|
53 };
|
|
|
54
|
|
|
55
|
|
|
56 ngx_module_t ngx_http_random_index_module = {
|
|
|
57 NGX_MODULE_V1,
|
|
|
58 &ngx_http_random_index_module_ctx, /* module context */
|
|
|
59 ngx_http_random_index_commands, /* module directives */
|
|
|
60 NGX_HTTP_MODULE, /* module type */
|
|
|
61 NULL, /* init master */
|
|
|
62 NULL, /* init module */
|
|
|
63 NULL, /* init process */
|
|
|
64 NULL, /* init thread */
|
|
|
65 NULL, /* exit thread */
|
|
|
66 NULL, /* exit process */
|
|
|
67 NULL, /* exit master */
|
|
|
68 NGX_MODULE_V1_PADDING
|
|
|
69 };
|
|
|
70
|
|
|
71
|
|
|
72 static ngx_int_t
|
|
|
73 ngx_http_random_index_handler(ngx_http_request_t *r)
|
|
|
74 {
|
|
|
75 u_char *last, *filename;
|
|
|
76 size_t len, allocated, root;
|
|
|
77 ngx_err_t err;
|
|
|
78 ngx_int_t rc;
|
|
|
79 ngx_str_t path, uri, *name;
|
|
|
80 ngx_dir_t dir;
|
|
|
81 ngx_uint_t n, level;
|
|
|
82 ngx_array_t names;
|
|
|
83 ngx_http_random_index_loc_conf_t *rlcf;
|
|
|
84
|
|
|
85 if (r->uri.data[r->uri.len - 1] != '/') {
|
|
|
86 return NGX_DECLINED;
|
|
|
87 }
|
|
|
88
|
|
|
89 if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD|NGX_HTTP_POST))) {
|
|
|
90 return NGX_DECLINED;
|
|
|
91 }
|
|
|
92
|
|
|
93 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_random_index_module);
|
|
|
94
|
|
|
95 if (!rlcf->enable) {
|
|
|
96 return NGX_DECLINED;
|
|
|
97 }
|
|
|
98
|
|
|
99 #if (NGX_HAVE_D_TYPE)
|
|
|
100 len = NGX_DIR_MASK_LEN;
|
|
|
101 #else
|
|
|
102 len = NGX_HTTP_RANDOM_INDEX_PREALLOCATE;
|
|
|
103 #endif
|
|
|
104
|
|
|
105 last = ngx_http_map_uri_to_path(r, &path, &root, len);
|
|
|
106 if (last == NULL) {
|
|
|
107 return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
|
108 }
|
|
|
109
|
|
|
110 allocated = path.len;
|
|
|
111
|
|
|
112 path.len = last - path.data - 1;
|
|
|
113 path.data[path.len] = '\0';
|
|
|
114
|
|
|
115 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
116 "http random index: \"%s\"", path.data);
|
|
|
117
|
|
|
118 if (ngx_open_dir(&path, &dir) == NGX_ERROR) {
|
|
|
119 err = ngx_errno;
|
|
|
120
|
|
|
121 if (err == NGX_ENOENT
|
|
|
122 || err == NGX_ENOTDIR
|
|
|
123 || err == NGX_ENAMETOOLONG)
|
|
|
124 {
|
|
|
125 level = NGX_LOG_ERR;
|
|
|
126 rc = NGX_HTTP_NOT_FOUND;
|
|
|
127
|
|
|
128 } else if (err == NGX_EACCES) {
|
|
|
129 level = NGX_LOG_ERR;
|
|
|
130 rc = NGX_HTTP_FORBIDDEN;
|
|
|
131
|
|
|
132 } else {
|
|
|
133 level = NGX_LOG_CRIT;
|
|
|
134 rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
|
135 }
|
|
|
136
|
|
|
137 ngx_log_error(level, r->connection->log, err,
|
|
|
138 ngx_open_dir_n " \"%s\" failed", path.data);
|
|
|
139
|
|
|
140 return rc;
|
|
|
141 }
|
|
|
142
|
|
|
143 if (ngx_array_init(&names, r->pool, 32, sizeof(ngx_str_t)) != NGX_OK) {
|
|
|
144 return ngx_http_random_index_error(r, &dir, &path);
|
|
|
145 }
|
|
|
146
|
|
|
147 filename = path.data;
|
|
|
148 filename[path.len] = '/';
|
|
|
149
|
|
|
150 for ( ;; ) {
|
|
|
151 ngx_set_errno(0);
|
|
|
152
|
|
|
153 if (ngx_read_dir(&dir) == NGX_ERROR) {
|
|
|
154 err = ngx_errno;
|
|
|
155
|
|
|
156 if (err != NGX_ENOMOREFILES) {
|
|
|
157 ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
|
|
|
158 ngx_read_dir_n " \"%V\" failed", &path);
|
|
|
159 return ngx_http_random_index_error(r, &dir, &path);
|
|
|
160 }
|
|
|
161
|
|
|
162 break;
|
|
|
163 }
|
|
|
164
|
|
|
165 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
166 "http random index file: \"%s\"", ngx_de_name(&dir));
|
|
|
167
|
|
|
168 if (ngx_de_name(&dir)[0] == '.') {
|
|
|
169 continue;
|
|
|
170 }
|
|
|
171
|
|
|
172 len = ngx_de_namelen(&dir);
|
|
|
173
|
|
536
|
174 if (dir.type == 0 || ngx_de_is_link(&dir)) {
|
|
406
|
175
|
|
|
176 /* 1 byte for '/' and 1 byte for terminating '\0' */
|
|
|
177
|
|
|
178 if (path.len + 1 + len + 1 > allocated) {
|
|
|
179 allocated = path.len + 1 + len + 1
|
|
|
180 + NGX_HTTP_RANDOM_INDEX_PREALLOCATE;
|
|
|
181
|
|
|
182 filename = ngx_pnalloc(r->pool, allocated);
|
|
|
183 if (filename == NULL) {
|
|
|
184 return ngx_http_random_index_error(r, &dir, &path);
|
|
|
185 }
|
|
|
186
|
|
|
187 last = ngx_cpystrn(filename, path.data, path.len + 1);
|
|
|
188 *last++ = '/';
|
|
|
189 }
|
|
|
190
|
|
|
191 ngx_cpystrn(last, ngx_de_name(&dir), len + 1);
|
|
|
192
|
|
|
193 if (ngx_de_info(filename, &dir) == NGX_FILE_ERROR) {
|
|
|
194 err = ngx_errno;
|
|
|
195
|
|
|
196 if (err != NGX_ENOENT) {
|
|
|
197 ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
|
|
|
198 ngx_de_info_n " \"%s\" failed", filename);
|
|
|
199 return ngx_http_random_index_error(r, &dir, &path);
|
|
|
200 }
|
|
|
201
|
|
|
202 if (ngx_de_link_info(filename, &dir) == NGX_FILE_ERROR) {
|
|
|
203 ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
|
|
|
204 ngx_de_link_info_n " \"%s\" failed",
|
|
|
205 filename);
|
|
|
206 return ngx_http_random_index_error(r, &dir, &path);
|
|
|
207 }
|
|
|
208 }
|
|
|
209 }
|
|
|
210
|
|
|
211 if (!ngx_de_is_file(&dir)) {
|
|
|
212 continue;
|
|
|
213 }
|
|
|
214
|
|
|
215 name = ngx_array_push(&names);
|
|
|
216 if (name == NULL) {
|
|
|
217 return ngx_http_random_index_error(r, &dir, &path);
|
|
|
218 }
|
|
|
219
|
|
|
220 name->len = len;
|
|
|
221
|
|
|
222 name->data = ngx_pnalloc(r->pool, len);
|
|
|
223 if (name->data == NULL) {
|
|
|
224 return ngx_http_random_index_error(r, &dir, &path);
|
|
|
225 }
|
|
|
226
|
|
|
227 ngx_memcpy(name->data, ngx_de_name(&dir), len);
|
|
|
228 }
|
|
|
229
|
|
|
230 if (ngx_close_dir(&dir) == NGX_ERROR) {
|
|
|
231 ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
|
|
|
232 ngx_close_dir_n " \"%s\" failed", &path);
|
|
|
233 }
|
|
|
234
|
|
|
235 n = names.nelts;
|
|
|
236
|
|
|
237 if (n == 0) {
|
|
|
238 return NGX_DECLINED;
|
|
|
239 }
|
|
|
240
|
|
|
241 name = names.elts;
|
|
|
242
|
|
|
243 n = (ngx_uint_t) (((uint64_t) ngx_random() * n) / 0x80000000);
|
|
|
244
|
|
|
245 uri.len = r->uri.len + name[n].len;
|
|
|
246
|
|
|
247 uri.data = ngx_pnalloc(r->pool, uri.len);
|
|
|
248 if (uri.data == NULL) {
|
|
|
249 return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
|
250 }
|
|
|
251
|
|
|
252 last = ngx_copy(uri.data, r->uri.data, r->uri.len);
|
|
|
253 ngx_memcpy(last, name[n].data, name[n].len);
|
|
|
254
|
|
|
255 return ngx_http_internal_redirect(r, &uri, &r->args);
|
|
|
256 }
|
|
|
257
|
|
|
258
|
|
|
259 static ngx_int_t
|
|
|
260 ngx_http_random_index_error(ngx_http_request_t *r, ngx_dir_t *dir,
|
|
|
261 ngx_str_t *name)
|
|
|
262 {
|
|
|
263 if (ngx_close_dir(dir) == NGX_ERROR) {
|
|
|
264 ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
|
|
|
265 ngx_close_dir_n " \"%V\" failed", name);
|
|
|
266 }
|
|
|
267
|
|
|
268 return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
|
269 }
|
|
|
270
|
|
|
271
|
|
|
272 static void *
|
|
|
273 ngx_http_random_index_create_loc_conf(ngx_conf_t *cf)
|
|
|
274 {
|
|
|
275 ngx_http_random_index_loc_conf_t *conf;
|
|
|
276
|
|
|
277 conf = ngx_palloc(cf->pool, sizeof(ngx_http_random_index_loc_conf_t));
|
|
|
278 if (conf == NULL) {
|
|
496
|
279 return NULL;
|
|
406
|
280 }
|
|
|
281
|
|
|
282 conf->enable = NGX_CONF_UNSET;
|
|
|
283
|
|
|
284 return conf;
|
|
|
285 }
|
|
|
286
|
|
|
287
|
|
|
288 static char *
|
|
|
289 ngx_http_random_index_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
290 {
|
|
|
291 ngx_http_random_index_loc_conf_t *prev = parent;
|
|
|
292 ngx_http_random_index_loc_conf_t *conf = child;
|
|
|
293
|
|
|
294 ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
|
295
|
|
|
296 return NGX_CONF_OK;
|
|
|
297 }
|
|
|
298
|
|
|
299
|
|
|
300 static ngx_int_t
|
|
|
301 ngx_http_random_index_init(ngx_conf_t *cf)
|
|
|
302 {
|
|
|
303 ngx_http_handler_pt *h;
|
|
|
304 ngx_http_core_main_conf_t *cmcf;
|
|
|
305
|
|
|
306 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
|
|
307
|
|
|
308 h = ngx_array_push(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers);
|
|
|
309 if (h == NULL) {
|
|
|
310 return NGX_ERROR;
|
|
|
311 }
|
|
|
312
|
|
|
313 *h = ngx_http_random_index_handler;
|
|
|
314
|
|
|
315 return NGX_OK;
|
|
|
316 }
|
