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comparison src/http/modules/ngx_http_random_index_module.c @ 406:79c5df00501e NGINX_0_7_15

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nginx 0.7.15 *) Feature: the ngx_http_random_index_module. *) Feature: the "directio" directive has been optimized for file requests starting from arbitrary position. *) Feature: the "directio" directive turns off sendfile if it is necessary. *) Feature: now nginx allows underscores in a client request header line names.
author Igor Sysoev <http://sysoev.ru>
date Mon, 08 Sep 2008 00:00:00 +0400
parents
children 549994537f15
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405:2993e60bc4e0 406:79c5df00501e
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 /* TODO: Win32 */
90 if (r->zero_in_uri) {
91 return NGX_DECLINED;
92 }
93
94 if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD|NGX_HTTP_POST))) {
95 return NGX_DECLINED;
96 }
97
98 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_random_index_module);
99
100 if (!rlcf->enable) {
101 return NGX_DECLINED;
102 }
103
104 #if (NGX_HAVE_D_TYPE)
105 len = NGX_DIR_MASK_LEN;
106 #else
107 len = NGX_HTTP_RANDOM_INDEX_PREALLOCATE;
108 #endif
109
110 last = ngx_http_map_uri_to_path(r, &path, &root, len);
111 if (last == NULL) {
112 return NGX_HTTP_INTERNAL_SERVER_ERROR;
113 }
114
115 allocated = path.len;
116
117 path.len = last - path.data - 1;
118 path.data[path.len] = '\0';
119
120 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
121 "http random index: \"%s\"", path.data);
122
123 if (ngx_open_dir(&path, &dir) == NGX_ERROR) {
124 err = ngx_errno;
125
126 if (err == NGX_ENOENT
127 || err == NGX_ENOTDIR
128 || err == NGX_ENAMETOOLONG)
129 {
130 level = NGX_LOG_ERR;
131 rc = NGX_HTTP_NOT_FOUND;
132
133 } else if (err == NGX_EACCES) {
134 level = NGX_LOG_ERR;
135 rc = NGX_HTTP_FORBIDDEN;
136
137 } else {
138 level = NGX_LOG_CRIT;
139 rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
140 }
141
142 ngx_log_error(level, r->connection->log, err,
143 ngx_open_dir_n " \"%s\" failed", path.data);
144
145 return rc;
146 }
147
148 if (ngx_array_init(&names, r->pool, 32, sizeof(ngx_str_t)) != NGX_OK) {
149 return ngx_http_random_index_error(r, &dir, &path);
150 }
151
152 filename = path.data;
153 filename[path.len] = '/';
154
155 for ( ;; ) {
156 ngx_set_errno(0);
157
158 if (ngx_read_dir(&dir) == NGX_ERROR) {
159 err = ngx_errno;
160
161 if (err != NGX_ENOMOREFILES) {
162 ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
163 ngx_read_dir_n " \"%V\" failed", &path);
164 return ngx_http_random_index_error(r, &dir, &path);
165 }
166
167 break;
168 }
169
170 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
171 "http random index file: \"%s\"", ngx_de_name(&dir));
172
173 if (ngx_de_name(&dir)[0] == '.') {
174 continue;
175 }
176
177 len = ngx_de_namelen(&dir);
178
179 if (!dir.valid_type) {
180
181 /* 1 byte for '/' and 1 byte for terminating '\0' */
182
183 if (path.len + 1 + len + 1 > allocated) {
184 allocated = path.len + 1 + len + 1
185 + NGX_HTTP_RANDOM_INDEX_PREALLOCATE;
186
187 filename = ngx_pnalloc(r->pool, allocated);
188 if (filename == NULL) {
189 return ngx_http_random_index_error(r, &dir, &path);
190 }
191
192 last = ngx_cpystrn(filename, path.data, path.len + 1);
193 *last++ = '/';
194 }
195
196 ngx_cpystrn(last, ngx_de_name(&dir), len + 1);
197
198 if (ngx_de_info(filename, &dir) == NGX_FILE_ERROR) {
199 err = ngx_errno;
200
201 if (err != NGX_ENOENT) {
202 ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
203 ngx_de_info_n " \"%s\" failed", filename);
204 return ngx_http_random_index_error(r, &dir, &path);
205 }
206
207 if (ngx_de_link_info(filename, &dir) == NGX_FILE_ERROR) {
208 ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
209 ngx_de_link_info_n " \"%s\" failed",
210 filename);
211 return ngx_http_random_index_error(r, &dir, &path);
212 }
213 }
214 }
215
216 if (!ngx_de_is_file(&dir)) {
217 continue;
218 }
219
220 name = ngx_array_push(&names);
221 if (name == NULL) {
222 return ngx_http_random_index_error(r, &dir, &path);
223 }
224
225 name->len = len;
226
227 name->data = ngx_pnalloc(r->pool, len);
228 if (name->data == NULL) {
229 return ngx_http_random_index_error(r, &dir, &path);
230 }
231
232 ngx_memcpy(name->data, ngx_de_name(&dir), len);
233 }
234
235 if (ngx_close_dir(&dir) == NGX_ERROR) {
236 ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
237 ngx_close_dir_n " \"%s\" failed", &path);
238 }
239
240 n = names.nelts;
241
242 if (n == 0) {
243 return NGX_DECLINED;
244 }
245
246 name = names.elts;
247
248 n = (ngx_uint_t) (((uint64_t) ngx_random() * n) / 0x80000000);
249
250 uri.len = r->uri.len + name[n].len;
251
252 uri.data = ngx_pnalloc(r->pool, uri.len);
253 if (uri.data == NULL) {
254 return NGX_HTTP_INTERNAL_SERVER_ERROR;
255 }
256
257 last = ngx_copy(uri.data, r->uri.data, r->uri.len);
258 ngx_memcpy(last, name[n].data, name[n].len);
259
260 return ngx_http_internal_redirect(r, &uri, &r->args);
261 }
262
263
264 static ngx_int_t
265 ngx_http_random_index_error(ngx_http_request_t *r, ngx_dir_t *dir,
266 ngx_str_t *name)
267 {
268 if (ngx_close_dir(dir) == NGX_ERROR) {
269 ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
270 ngx_close_dir_n " \"%V\" failed", name);
271 }
272
273 return NGX_HTTP_INTERNAL_SERVER_ERROR;
274 }
275
276
277 static void *
278 ngx_http_random_index_create_loc_conf(ngx_conf_t *cf)
279 {
280 ngx_http_random_index_loc_conf_t *conf;
281
282 conf = ngx_palloc(cf->pool, sizeof(ngx_http_random_index_loc_conf_t));
283 if (conf == NULL) {
284 return NGX_CONF_ERROR;
285 }
286
287 conf->enable = NGX_CONF_UNSET;
288
289 return conf;
290 }
291
292
293 static char *
294 ngx_http_random_index_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
295 {
296 ngx_http_random_index_loc_conf_t *prev = parent;
297 ngx_http_random_index_loc_conf_t *conf = child;
298
299 ngx_conf_merge_value(conf->enable, prev->enable, 0);
300
301 return NGX_CONF_OK;
302 }
303
304
305 static ngx_int_t
306 ngx_http_random_index_init(ngx_conf_t *cf)
307 {
308 ngx_http_handler_pt *h;
309 ngx_http_core_main_conf_t *cmcf;
310
311 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
312
313 h = ngx_array_push(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers);
314 if (h == NULL) {
315 return NGX_ERROR;
316 }
317
318 *h = ngx_http_random_index_handler;
319
320 return NGX_OK;
321 }