mirror of
https://github.com/nginx/nginx.git
synced 2024-12-16 22:47:47 +08:00
317 lines
8.7 KiB
C
317 lines
8.7 KiB
C
|
|
/*
|
|
* Copyright (C) Igor Sysoev
|
|
*/
|
|
|
|
|
|
#include <ngx_config.h>
|
|
#include <ngx_core.h>
|
|
#include <ngx_http.h>
|
|
|
|
|
|
typedef struct {
|
|
ngx_flag_t enable;
|
|
} ngx_http_random_index_loc_conf_t;
|
|
|
|
|
|
#define NGX_HTTP_RANDOM_INDEX_PREALLOCATE 50
|
|
|
|
|
|
static ngx_int_t ngx_http_random_index_error(ngx_http_request_t *r,
|
|
ngx_dir_t *dir, ngx_str_t *name);
|
|
static ngx_int_t ngx_http_random_index_init(ngx_conf_t *cf);
|
|
static void *ngx_http_random_index_create_loc_conf(ngx_conf_t *cf);
|
|
static char *ngx_http_random_index_merge_loc_conf(ngx_conf_t *cf,
|
|
void *parent, void *child);
|
|
|
|
|
|
static ngx_command_t ngx_http_random_index_commands[] = {
|
|
|
|
{ ngx_string("random_index"),
|
|
NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
|
|
ngx_conf_set_flag_slot,
|
|
NGX_HTTP_LOC_CONF_OFFSET,
|
|
offsetof(ngx_http_random_index_loc_conf_t, enable),
|
|
NULL },
|
|
|
|
ngx_null_command
|
|
};
|
|
|
|
|
|
static ngx_http_module_t ngx_http_random_index_module_ctx = {
|
|
NULL, /* preconfiguration */
|
|
ngx_http_random_index_init, /* postconfiguration */
|
|
|
|
NULL, /* create main configuration */
|
|
NULL, /* init main configuration */
|
|
|
|
NULL, /* create server configuration */
|
|
NULL, /* merge server configuration */
|
|
|
|
ngx_http_random_index_create_loc_conf, /* create location configration */
|
|
ngx_http_random_index_merge_loc_conf /* merge location configration */
|
|
};
|
|
|
|
|
|
ngx_module_t ngx_http_random_index_module = {
|
|
NGX_MODULE_V1,
|
|
&ngx_http_random_index_module_ctx, /* module context */
|
|
ngx_http_random_index_commands, /* module directives */
|
|
NGX_HTTP_MODULE, /* module type */
|
|
NULL, /* init master */
|
|
NULL, /* init module */
|
|
NULL, /* init process */
|
|
NULL, /* init thread */
|
|
NULL, /* exit thread */
|
|
NULL, /* exit process */
|
|
NULL, /* exit master */
|
|
NGX_MODULE_V1_PADDING
|
|
};
|
|
|
|
|
|
static ngx_int_t
|
|
ngx_http_random_index_handler(ngx_http_request_t *r)
|
|
{
|
|
u_char *last, *filename;
|
|
size_t len, allocated, root;
|
|
ngx_err_t err;
|
|
ngx_int_t rc;
|
|
ngx_str_t path, uri, *name;
|
|
ngx_dir_t dir;
|
|
ngx_uint_t n, level;
|
|
ngx_array_t names;
|
|
ngx_http_random_index_loc_conf_t *rlcf;
|
|
|
|
if (r->uri.data[r->uri.len - 1] != '/') {
|
|
return NGX_DECLINED;
|
|
}
|
|
|
|
if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD|NGX_HTTP_POST))) {
|
|
return NGX_DECLINED;
|
|
}
|
|
|
|
rlcf = ngx_http_get_module_loc_conf(r, ngx_http_random_index_module);
|
|
|
|
if (!rlcf->enable) {
|
|
return NGX_DECLINED;
|
|
}
|
|
|
|
#if (NGX_HAVE_D_TYPE)
|
|
len = NGX_DIR_MASK_LEN;
|
|
#else
|
|
len = NGX_HTTP_RANDOM_INDEX_PREALLOCATE;
|
|
#endif
|
|
|
|
last = ngx_http_map_uri_to_path(r, &path, &root, len);
|
|
if (last == NULL) {
|
|
return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
}
|
|
|
|
allocated = path.len;
|
|
|
|
path.len = last - path.data - 1;
|
|
path.data[path.len] = '\0';
|
|
|
|
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
"http random index: \"%s\"", path.data);
|
|
|
|
if (ngx_open_dir(&path, &dir) == NGX_ERROR) {
|
|
err = ngx_errno;
|
|
|
|
if (err == NGX_ENOENT
|
|
|| err == NGX_ENOTDIR
|
|
|| err == NGX_ENAMETOOLONG)
|
|
{
|
|
level = NGX_LOG_ERR;
|
|
rc = NGX_HTTP_NOT_FOUND;
|
|
|
|
} else if (err == NGX_EACCES) {
|
|
level = NGX_LOG_ERR;
|
|
rc = NGX_HTTP_FORBIDDEN;
|
|
|
|
} else {
|
|
level = NGX_LOG_CRIT;
|
|
rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
}
|
|
|
|
ngx_log_error(level, r->connection->log, err,
|
|
ngx_open_dir_n " \"%s\" failed", path.data);
|
|
|
|
return rc;
|
|
}
|
|
|
|
if (ngx_array_init(&names, r->pool, 32, sizeof(ngx_str_t)) != NGX_OK) {
|
|
return ngx_http_random_index_error(r, &dir, &path);
|
|
}
|
|
|
|
filename = path.data;
|
|
filename[path.len] = '/';
|
|
|
|
for ( ;; ) {
|
|
ngx_set_errno(0);
|
|
|
|
if (ngx_read_dir(&dir) == NGX_ERROR) {
|
|
err = ngx_errno;
|
|
|
|
if (err != NGX_ENOMOREFILES) {
|
|
ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
|
|
ngx_read_dir_n " \"%V\" failed", &path);
|
|
return ngx_http_random_index_error(r, &dir, &path);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
"http random index file: \"%s\"", ngx_de_name(&dir));
|
|
|
|
if (ngx_de_name(&dir)[0] == '.') {
|
|
continue;
|
|
}
|
|
|
|
len = ngx_de_namelen(&dir);
|
|
|
|
if (dir.type == 0 || ngx_de_is_link(&dir)) {
|
|
|
|
/* 1 byte for '/' and 1 byte for terminating '\0' */
|
|
|
|
if (path.len + 1 + len + 1 > allocated) {
|
|
allocated = path.len + 1 + len + 1
|
|
+ NGX_HTTP_RANDOM_INDEX_PREALLOCATE;
|
|
|
|
filename = ngx_pnalloc(r->pool, allocated);
|
|
if (filename == NULL) {
|
|
return ngx_http_random_index_error(r, &dir, &path);
|
|
}
|
|
|
|
last = ngx_cpystrn(filename, path.data, path.len + 1);
|
|
*last++ = '/';
|
|
}
|
|
|
|
ngx_cpystrn(last, ngx_de_name(&dir), len + 1);
|
|
|
|
if (ngx_de_info(filename, &dir) == NGX_FILE_ERROR) {
|
|
err = ngx_errno;
|
|
|
|
if (err != NGX_ENOENT) {
|
|
ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
|
|
ngx_de_info_n " \"%s\" failed", filename);
|
|
return ngx_http_random_index_error(r, &dir, &path);
|
|
}
|
|
|
|
if (ngx_de_link_info(filename, &dir) == NGX_FILE_ERROR) {
|
|
ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
|
|
ngx_de_link_info_n " \"%s\" failed",
|
|
filename);
|
|
return ngx_http_random_index_error(r, &dir, &path);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!ngx_de_is_file(&dir)) {
|
|
continue;
|
|
}
|
|
|
|
name = ngx_array_push(&names);
|
|
if (name == NULL) {
|
|
return ngx_http_random_index_error(r, &dir, &path);
|
|
}
|
|
|
|
name->len = len;
|
|
|
|
name->data = ngx_pnalloc(r->pool, len);
|
|
if (name->data == NULL) {
|
|
return ngx_http_random_index_error(r, &dir, &path);
|
|
}
|
|
|
|
ngx_memcpy(name->data, ngx_de_name(&dir), len);
|
|
}
|
|
|
|
if (ngx_close_dir(&dir) == NGX_ERROR) {
|
|
ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
|
|
ngx_close_dir_n " \"%s\" failed", &path);
|
|
}
|
|
|
|
n = names.nelts;
|
|
|
|
if (n == 0) {
|
|
return NGX_DECLINED;
|
|
}
|
|
|
|
name = names.elts;
|
|
|
|
n = (ngx_uint_t) (((uint64_t) ngx_random() * n) / 0x80000000);
|
|
|
|
uri.len = r->uri.len + name[n].len;
|
|
|
|
uri.data = ngx_pnalloc(r->pool, uri.len);
|
|
if (uri.data == NULL) {
|
|
return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
}
|
|
|
|
last = ngx_copy(uri.data, r->uri.data, r->uri.len);
|
|
ngx_memcpy(last, name[n].data, name[n].len);
|
|
|
|
return ngx_http_internal_redirect(r, &uri, &r->args);
|
|
}
|
|
|
|
|
|
static ngx_int_t
|
|
ngx_http_random_index_error(ngx_http_request_t *r, ngx_dir_t *dir,
|
|
ngx_str_t *name)
|
|
{
|
|
if (ngx_close_dir(dir) == NGX_ERROR) {
|
|
ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
|
|
ngx_close_dir_n " \"%V\" failed", name);
|
|
}
|
|
|
|
return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
}
|
|
|
|
|
|
static void *
|
|
ngx_http_random_index_create_loc_conf(ngx_conf_t *cf)
|
|
{
|
|
ngx_http_random_index_loc_conf_t *conf;
|
|
|
|
conf = ngx_palloc(cf->pool, sizeof(ngx_http_random_index_loc_conf_t));
|
|
if (conf == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
conf->enable = NGX_CONF_UNSET;
|
|
|
|
return conf;
|
|
}
|
|
|
|
|
|
static char *
|
|
ngx_http_random_index_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
{
|
|
ngx_http_random_index_loc_conf_t *prev = parent;
|
|
ngx_http_random_index_loc_conf_t *conf = child;
|
|
|
|
ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
|
|
return NGX_CONF_OK;
|
|
}
|
|
|
|
|
|
static ngx_int_t
|
|
ngx_http_random_index_init(ngx_conf_t *cf)
|
|
{
|
|
ngx_http_handler_pt *h;
|
|
ngx_http_core_main_conf_t *cmcf;
|
|
|
|
cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
|
|
|
h = ngx_array_push(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers);
|
|
if (h == NULL) {
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
*h = ngx_http_random_index_handler;
|
|
|
|
return NGX_OK;
|
|
}
|