nginx/src/http/modules/ngx_http_static_handler.c

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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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typedef struct {
ngx_http_cache_hash_t *redirect_cache;
} ngx_http_static_loc_conf_t;
static ngx_int_t ngx_http_static_handler(ngx_http_request_t *r);
static void *ngx_http_static_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_static_merge_loc_conf(ngx_conf_t *cf,
void *parent, void *child);
static ngx_int_t ngx_http_static_init(ngx_cycle_t *cycle);
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static ngx_command_t ngx_http_static_commands[] = {
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#if (NGX_HTTP_CACHE)
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{ ngx_string("redirect_cache"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE3,
ngx_http_set_cache_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_static_loc_conf_t, redirect_cache),
NULL },
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#endif
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ngx_null_command
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};
ngx_http_module_t ngx_http_static_module_ctx = {
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NULL, /* pre conf */
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NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
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ngx_http_static_create_loc_conf, /* create location configuration */
ngx_http_static_merge_loc_conf /* merge location configuration */
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};
ngx_module_t ngx_http_static_module = {
NGX_MODULE,
&ngx_http_static_module_ctx, /* module context */
ngx_http_static_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
ngx_http_static_init, /* init module */
NULL /* init child */
};
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static ngx_int_t ngx_http_static_handler(ngx_http_request_t *r)
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{
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u_char *last;
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ngx_fd_t fd;
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ngx_int_t rc;
ngx_uint_t level;
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ngx_str_t name, location;
ngx_err_t err;
ngx_log_t *log;
ngx_hunk_t *h;
ngx_chain_t out;
ngx_file_info_t fi;
ngx_http_cleanup_t *file_cleanup, *redirect_cleanup;
ngx_http_log_ctx_t *ctx;
ngx_http_core_loc_conf_t *clcf;
ngx_http_static_loc_conf_t *slcf;
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#if (NGX_HTTP_CACHE)
uint32_t file_crc, redirect_crc;
ngx_http_cache_t *file, *redirect;
#endif
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if (r->uri.data[r->uri.len - 1] == '/') {
return NGX_DECLINED;
}
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if (r->method != NGX_HTTP_GET && r->method != NGX_HTTP_HEAD) {
return NGX_HTTP_NOT_ALLOWED;
}
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rc = ngx_http_discard_body(r);
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if (rc != NGX_OK && rc != NGX_AGAIN) {
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return rc;
}
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#if (NGX_HTTP_CACHE)
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/*
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* there is a valid cached open file, i.e by the index handler,
* and it should be already registered in r->cleanup
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*/
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if (r->cache && !r->cache->expired) {
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return ngx_http_send_cached(r);
}
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#endif
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log = r->connection->log;
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clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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/*
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* make a file name, reserve 2 bytes for a trailing '/'
* in a possible redirect and for the last '\0'
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*/
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name.data = ngx_palloc(r->pool, clcf->root.len + r->uri.len + 2
- clcf->alias * clcf->name.len);
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if (name.data == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
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location.data = ngx_cpymem(name.data, clcf->root.data, clcf->root.len);
if (clcf->alias) {
last = ngx_cpystrn(location.data, r->uri.data + clcf->name.len,
r->uri.len + 1 - clcf->name.len);
/*
* aliases usually have trailling "/",
* set it in the start of the possible redirect
*/
if (*location.data != '/') {
location.data--;
}
} else {
last = ngx_cpystrn(location.data, r->uri.data, r->uri.len + 1);
}
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name.len = last - name.data;
location.len = last - location.data + 1;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
"http filename: \"%s\"", name.data);
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/* allocate cleanups */
if (!(file_cleanup = ngx_push_array(&r->cleanup))) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
file_cleanup->valid = 0;
slcf = ngx_http_get_module_loc_conf(r, ngx_http_static_module);
if (slcf->redirect_cache) {
if (!(redirect_cleanup = ngx_push_array(&r->cleanup))) {
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return NGX_HTTP_INTERNAL_SERVER_ERROR;
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}
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redirect_cleanup->valid = 0;
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} else {
redirect_cleanup = NULL;
}
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#if (NGX_HTTP_CACHE)
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/* look up an open files cache */
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if (clcf->open_files) {
file = ngx_http_cache_get(clcf->open_files, file_cleanup,
&name, &file_crc);
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ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
"http open file cache get: " PTR_FMT, file);
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if (file && !file->expired) {
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r->cache = file;
return ngx_http_send_cached(r);
}
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} else {
file = NULL;
}
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/* look up an redirect cache */
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if (slcf->redirect_cache) {
redirect = ngx_http_cache_get(slcf->redirect_cache, redirect_cleanup,
&name, &redirect_crc);
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ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
"http redirect cache get: " PTR_FMT, redirect);
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if (redirect && !redirect->expired) {
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/*
* We do not copy a cached value so the cache entry is locked
* until the end of the request. In a single threaded model
* the redirected request should complete before other event
* will be processed. In a multithreaded model this locking
* should keep more popular redirects in cache.
*/
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if (!(r->headers_out.location =
ngx_http_add_header(&r->headers_out, ngx_http_headers_out)))
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{
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return NGX_HTTP_INTERNAL_SERVER_ERROR;
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}
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r->headers_out.location->value = redirect->data.value;
return NGX_HTTP_MOVED_PERMANENTLY;
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}
} else {
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redirect = NULL;
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}
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#endif
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/* open file */
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#if (WIN9X)
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/* TODO: redirect cache */
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if (ngx_win32_version < NGX_WIN_NT) {
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/*
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* there is no way to open a file or a directory in Win9X with
* one syscall because Win9X has no FILE_FLAG_BACKUP_SEMANTICS flag
* so we need to check its type before the opening
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*/
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if (ngx_file_info(name.data, &fi) == NGX_FILE_ERROR) {
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err = ngx_errno;
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ngx_log_error(NGX_LOG_ERR, log, err,
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ngx_file_info_n " \"%s\" failed", name.data);
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if (err == NGX_ENOENT || err == NGX_ENOTDIR) {
return NGX_HTTP_NOT_FOUND;
} else if (err == NGX_EACCES) {
return NGX_HTTP_FORBIDDEN;
} else {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
}
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if (ngx_is_dir(&fi)) {
ngx_log_debug(log, "HTTP DIR: '%s'" _ name.data);
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if (!(r->headers_out.location =
ngx_http_add_header(&r->headers_out, ngx_http_headers_out)))
{
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
*last++ = '/';
*last = '\0';
r->headers_out.location->value.len = last - location;
r->headers_out.location->value.data = location;
return NGX_HTTP_MOVED_PERMANENTLY;
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}
}
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#endif
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fd = ngx_open_file(name.data, NGX_FILE_RDONLY, NGX_FILE_OPEN);
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if (fd == NGX_INVALID_FILE) {
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err = ngx_errno;
if (err == NGX_ENOENT || err == NGX_ENOTDIR) {
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level = NGX_LOG_ERR;
rc = NGX_HTTP_NOT_FOUND;
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} else if (err == NGX_EACCES) {
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level = NGX_LOG_ERR;
rc = NGX_HTTP_FORBIDDEN;
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} else {
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level = NGX_LOG_CRIT;
rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
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}
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ngx_log_error(level, log, err,
ngx_open_file_n " \"%s\" failed", name.data);
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return rc;
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}
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ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0, "http static fd: %d", fd);
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if (ngx_fd_info(fd, &fi) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_CRIT, log, ngx_errno,
ngx_fd_info_n " \"%s\" failed", name.data);
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if (ngx_close_file(fd) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
ngx_close_file_n " \"%s\" failed", name.data);
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}
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return NGX_HTTP_INTERNAL_SERVER_ERROR;
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}
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if (ngx_is_dir(&fi)) {
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ngx_log_debug0(NGX_LOG_DEBUG_HTTP, log, 0, "http dir");
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if (ngx_close_file(fd) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
ngx_close_file_n " \"%s\" failed", name.data);
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}
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*last++ = '/';
*last = '\0';
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if (!(r->headers_out.location =
ngx_http_add_header(&r->headers_out, ngx_http_headers_out)))
{
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
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r->headers_out.location->value = location;
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#if (NGX_HTTP_CACHE)
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if (slcf->redirect_cache) {
if (redirect) {
if (location.len == redirect->data.value.len
&& ngx_memcmp(redirect->data.value.data, location.data,
location.len) == 0)
{
redirect->accessed = ngx_cached_time;
redirect->updated = ngx_cached_time;
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/*
* we can unlock the cache entry because
* we have the local copy anyway
*/
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ngx_http_cache_unlock(slcf->redirect_cache, redirect, log);
redirect_cleanup->valid = 0;
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return NGX_HTTP_MOVED_PERMANENTLY;
}
}
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location.len++;
redirect = ngx_http_cache_alloc(slcf->redirect_cache, redirect,
redirect_cleanup,
&name, redirect_crc,
&location, log);
location.len--;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
"http redirect cache alloc: " PTR_FMT, redirect);
if (redirect) {
redirect->fd = NGX_INVALID_FILE;
redirect->accessed = ngx_cached_time;
redirect->last_modified = 0;
redirect->updated = ngx_cached_time;
redirect->memory = 1;
ngx_http_cache_unlock(slcf->redirect_cache, redirect, log);
redirect_cleanup->valid = 0;
}
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}
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#endif
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return NGX_HTTP_MOVED_PERMANENTLY;
}
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#if !(WIN32) /* the not regular files are probably Unix specific */
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if (!ngx_is_file(&fi)) {
ngx_log_error(NGX_LOG_CRIT, log, ngx_errno,
"%s is not a regular file", name.data);
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if (ngx_close_file(fd) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
ngx_close_file_n " \"%s\" failed", name.data);
}
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return NGX_HTTP_NOT_FOUND;
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}
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#endif
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#if (NGX_HTTP_CACHE)
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if (clcf->open_files) {
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#if (NGX_USE_HTTP_FILE_CACHE_UNIQ)
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if (file && file->uniq == ngx_file_uniq(&fi)) {
if (ngx_close_file(fd) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
ngx_close_file_n " \"%s\" failed", name.data);
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}
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file->accessed = ngx_cached_time;
file->updated = ngx_cached_time;
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file->expired = 0;
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r->cache = file;
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return ngx_http_send_cached(r);
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} else {
if (file) {
ngx_http_cache_unlock(clcf->open_files, file, log);
file = NULL;
}
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file = ngx_http_cache_alloc(clcf->open_files, file,
file_cleanup,
&name, file_crc, NULL, log);
if (file) {
file->uniq = ngx_file_uniq(&fi);
}
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}
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#else
file = ngx_http_cache_alloc(clcf->open_files, file,
file_cleanup,
&name, file_crc, NULL, log);
#endif
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ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
"http open file cache alloc: " PTR_FMT, file);
if (file) {
file->fd = fd;
file->data.size = ngx_file_size(&fi);
file->accessed = ngx_cached_time;
file->last_modified = ngx_file_mtime(&fi);
file->updated = ngx_cached_time;
r->cache = file;
}
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return ngx_http_send_cached(r);
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}
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#endif
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ctx = log->data;
ctx->action = "sending response to client";
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file_cleanup->data.file.fd = fd;
file_cleanup->data.file.name = name.data;
file_cleanup->valid = 1;
file_cleanup->cache = 0;
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r->headers_out.status = NGX_HTTP_OK;
r->headers_out.content_length_n = ngx_file_size(&fi);
r->headers_out.last_modified_time = ngx_file_mtime(&fi);
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if (ngx_http_set_content_type(r) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
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}
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/* we need to allocate all before the header would be sent */
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if (!(h = ngx_pcalloc(r->pool, sizeof(ngx_hunk_t)))) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
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if (!(h->file = ngx_pcalloc(r->pool, sizeof(ngx_file_t)))) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
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rc = ngx_http_send_header(r);
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if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
return rc;
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}
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h->type = r->main ? NGX_HUNK_FILE : NGX_HUNK_FILE|NGX_HUNK_LAST;
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h->file_pos = 0;
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h->file_last = ngx_file_size(&fi);
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h->file->fd = fd;
h->file->log = log;
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out.hunk = h;
out.next = NULL;
return ngx_http_output_filter(r, &out);
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}
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static void *ngx_http_static_create_loc_conf(ngx_conf_t *cf)
{
ngx_http_static_loc_conf_t *conf;
if (!(conf = ngx_palloc(cf->pool, sizeof(ngx_http_static_loc_conf_t)))) {
return NGX_CONF_ERROR;
}
conf->redirect_cache = NULL;
return conf;
}
static char *ngx_http_static_merge_loc_conf(ngx_conf_t *cf,
void *parent, void *child)
{
ngx_http_static_loc_conf_t *prev = parent;
ngx_http_static_loc_conf_t *conf = child;
if (conf->redirect_cache == NULL) {
conf->redirect_cache = prev->redirect_cache;
}
return NGX_CONF_OK;
}
static ngx_int_t ngx_http_static_init(ngx_cycle_t *cycle)
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{
ngx_http_handler_pt *h;
ngx_http_conf_ctx_t *ctx;
ngx_http_core_main_conf_t *cmcf;
ctx = (ngx_http_conf_ctx_t *) cycle->conf_ctx[ngx_http_module.index];
cmcf = ctx->main_conf[ngx_http_core_module.ctx_index];
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h = ngx_push_array(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers);
if (h == NULL) {
return NGX_ERROR;
}
*h = ngx_http_static_handler;
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return NGX_OK;
}