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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apr_lib.h"
#include "apr_file_io.h"
#include "apr_strings.h"
#include "apr_buckets.h"
#include "httpd.h"
#include "http_config.h"
#include "http_log.h"
#include "http_core.h"
#include "http_protocol.h"
#include "ap_provider.h"
#include "ap_socache.h"
#include "util_filter.h"
#include "util_script.h"
#include "util_charset.h"
#include "util_mutex.h"
#include "mod_cache.h"
#include "mod_status.h"
#include "cache_socache_common.h"
/*
* mod_cache_socache: Shared Object Cache Based HTTP 1.1 Cache.
*
* Flow to Find the entry:
* Incoming client requests URI /foo/bar/baz
* Fetch URI key (may contain Format #1 or Format #2)
* If format #1 (Contains a list of Vary Headers):
* Use each header name (from .header) with our request values (headers_in) to
* regenerate key using HeaderName+HeaderValue+.../foo/bar/baz
* re-read in key (must be format #2)
*
* Format #1:
* apr_uint32_t format;
* apr_time_t expire;
* apr_array_t vary_headers (delimited by CRLF)
*
* Format #2:
* cache_socache_info_t (first sizeof(apr_uint32_t) bytes is the format)
* entity name (sobj->name) [length is in cache_socache_info_t->name_len]
* r->headers_out (delimited by CRLF)
* CRLF
* r->headers_in (delimited by CRLF)
* CRLF
*/
module AP_MODULE_DECLARE_DATA cache_socache_module;
/*
* cache_socache_object_t
* Pointed to by cache_object_t::vobj
*/
typedef struct cache_socache_object_t
{
apr_pool_t *pool; /* pool */
unsigned char *buffer; /* the cache buffer */
apr_size_t buffer_len; /* size of the buffer */
apr_bucket_brigade *body; /* brigade containing the body, if any */
apr_table_t *headers_in; /* Input headers to save */
apr_table_t *headers_out; /* Output headers to save */
cache_socache_info_t socache_info; /* Header information. */
apr_size_t body_offset; /* offset to the start of the body */
apr_off_t body_length; /* length of the cached entity body */
apr_time_t expire; /* when to expire the entry */
const char *name; /* Requested URI without vary bits - suitable for mortals. */
const char *key; /* On-disk prefix; URI with Vary bits (if present) */
apr_off_t offset; /* Max size to set aside */
apr_time_t timeout; /* Max time to set aside */
unsigned int newbody :1; /* whether a new body is present */
unsigned int done :1; /* Is the attempt to cache complete? */
} cache_socache_object_t;
/*
* mod_cache_socache configuration
*/
#define DEFAULT_MAX_FILE_SIZE 100*1024
#define DEFAULT_MAXTIME 86400
#define DEFAULT_MINTIME 600
#define DEFAULT_READSIZE 0
#define DEFAULT_READTIME 0
typedef struct cache_socache_provider_conf
{
const char *args;
ap_socache_provider_t *socache_provider;
ap_socache_instance_t *socache_instance;
} cache_socache_provider_conf;
typedef struct cache_socache_conf
{
cache_socache_provider_conf *provider;
} cache_socache_conf;
typedef struct cache_socache_dir_conf
{
apr_off_t max; /* maximum file size for cached files */
apr_time_t maxtime; /* maximum expiry time */
apr_time_t mintime; /* minimum expiry time */
apr_off_t readsize; /* maximum data to attempt to cache in one go */
apr_time_t readtime; /* maximum time taken to cache in one go */
unsigned int max_set :1;
unsigned int maxtime_set :1;
unsigned int mintime_set :1;
unsigned int readsize_set :1;
unsigned int readtime_set :1;
} cache_socache_dir_conf;
/* Shared object cache and mutex */
static const char * const cache_socache_id = "cache-socache";
static apr_global_mutex_t *socache_mutex = NULL;
/*
* Local static functions
*/
static apr_status_t read_array(request_rec *r, apr_array_header_t *arr,
unsigned char *buffer, apr_size_t buffer_len, apr_size_t *slider)
{
apr_size_t val = *slider;
while (*slider < buffer_len) {
if (buffer[*slider] == '\r') {
if (val == *slider) {
(*slider)++;
return APR_SUCCESS;
}
*((const char **) apr_array_push(arr)) = apr_pstrndup(r->pool,
(const char *) buffer + val, *slider - val);
(*slider)++;
if (buffer[*slider] == '\n') {
(*slider)++;
}
val = *slider;
}
else if (buffer[*slider] == '\0') {
(*slider)++;
return APR_SUCCESS;
}
else {
(*slider)++;
}
}
return APR_EOF;
}
static apr_status_t store_array(apr_array_header_t *arr, unsigned char *buffer,
apr_size_t buffer_len, apr_size_t *slider)
{
int i, len;
const char **elts;
elts = (const char **) arr->elts;
for (i = 0; i < arr->nelts; i++) {
apr_size_t e_len = strlen(elts[i]);
if (e_len + 3 >= buffer_len - *slider) {
return APR_EOF;
}
len = apr_snprintf(buffer ? (char *) buffer + *slider : NULL,
buffer ? buffer_len - *slider : 0, "%s" CRLF, elts[i]);
*slider += len;
}
if (buffer) {
memcpy(buffer + *slider, CRLF, sizeof(CRLF) - 1);
}
*slider += sizeof(CRLF) - 1;
return APR_SUCCESS;
}
static apr_status_t read_table(cache_handle_t *handle, request_rec *r,
apr_table_t *table, unsigned char *buffer, apr_size_t buffer_len,
apr_size_t *slider)
{
apr_size_t key = *slider, colon = 0, len = 0;
while (*slider < buffer_len) {
if (buffer[*slider] == ':') {
if (!colon) {
colon = *slider;
}
(*slider)++;
}
else if (buffer[*slider] == '\r') {
len = colon;
if (key == *slider) {
(*slider)++;
if (buffer[*slider] == '\n') {
(*slider)++;
}
return APR_SUCCESS;
}
if (!colon || buffer[colon++] != ':') {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02344)
"Premature end of cache headers.");
return APR_EGENERAL;
}
while (apr_isspace(buffer[colon])) {
colon++;
}
apr_table_addn(table, apr_pstrndup(r->pool, (const char *) buffer
+ key, len - key), apr_pstrndup(r->pool,
(const char *) buffer + colon, *slider - colon));
(*slider)++;
if (buffer[*slider] == '\n') {
(*slider)++;
}
key = *slider;
colon = 0;
}
else if (buffer[*slider] == '\0') {
(*slider)++;
return APR_SUCCESS;
}
else {
(*slider)++;
}
}
return APR_EOF;
}
static apr_status_t store_table(apr_table_t *table, unsigned char *buffer,
apr_size_t buffer_len, apr_size_t *slider)
{
int i, len;
apr_table_entry_t *elts;
elts = (apr_table_entry_t *) apr_table_elts(table)->elts;
for (i = 0; i < apr_table_elts(table)->nelts; ++i) {
if (elts[i].key != NULL) {
apr_size_t key_len = strlen(elts[i].key);
apr_size_t val_len = strlen(elts[i].val);
if (key_len + val_len + 5 >= buffer_len - *slider) {
return APR_EOF;
}
len = apr_snprintf(buffer ? (char *) buffer + *slider : NULL,
buffer ? buffer_len - *slider : 0, "%s: %s" CRLF,
elts[i].key, elts[i].val);
*slider += len;
}
}
if (3 >= buffer_len - *slider) {
return APR_EOF;
}
if (buffer) {
memcpy(buffer + *slider, CRLF, sizeof(CRLF) - 1);
}
*slider += sizeof(CRLF) - 1;
return APR_SUCCESS;
}
static const char* regen_key(apr_pool_t *p, apr_table_t *headers,
apr_array_header_t *varray, const char *oldkey,
apr_size_t *newkeylen)
{
struct iovec *iov;
int i, k;
int nvec;
const char *header;
const char **elts;
nvec = (varray->nelts * 2) + 1;
iov = apr_palloc(p, sizeof(struct iovec) * nvec);
elts = (const char **) varray->elts;
/* TODO:
* - Handle multiple-value headers better. (sort them?)
* - Handle Case in-sensitive Values better.
* This isn't the end of the world, since it just lowers the cache
* hit rate, but it would be nice to fix.
*
* The majority are case insenstive if they are values (encoding etc).
* Most of rfc2616 is case insensitive on header contents.
*
* So the better solution may be to identify headers which should be
* treated case-sensitive?
* HTTP URI's (3.2.3) [host and scheme are insensitive]
* HTTP method (5.1.1)
* HTTP-date values (3.3.1)
* 3.7 Media Types [exerpt]
* The type, subtype, and parameter attribute names are case-
* insensitive. Parameter values might or might not be case-sensitive,
* depending on the semantics of the parameter name.
* 4.20 Except [exerpt]
* Comparison of expectation values is case-insensitive for unquoted
* tokens (including the 100-continue token), and is case-sensitive for
* quoted-string expectation-extensions.
*/
for (i = 0, k = 0; i < varray->nelts; i++) {
header = apr_table_get(headers, elts[i]);
if (!header) {
header = "";
}
iov[k].iov_base = (char*) elts[i];
iov[k].iov_len = strlen(elts[i]);
k++;
iov[k].iov_base = (char*) header;
iov[k].iov_len = strlen(header);
k++;
}
iov[k].iov_base = (char*) oldkey;
iov[k].iov_len = strlen(oldkey);
k++;
return apr_pstrcatv(p, iov, k, newkeylen);
}
static int array_alphasort(const void *fn1, const void *fn2)
{
return strcmp(*(char**) fn1, *(char**) fn2);
}
static void tokens_to_array(apr_pool_t *p, const char *data,
apr_array_header_t *arr)
{
char *token;
while ((token = ap_get_list_item(p, &data)) != NULL) {
*((const char **) apr_array_push(arr)) = token;
}
/* Sort it so that "Vary: A, B" and "Vary: B, A" are stored the same. */
qsort((void *) arr->elts, arr->nelts, sizeof(char *), array_alphasort);
}
/*
* Hook and mod_cache callback functions
*/
static int create_entity(cache_handle_t *h, request_rec *r, const char *key,
apr_off_t len, apr_bucket_brigade *bb)
{
cache_socache_dir_conf *dconf =
ap_get_module_config(r->per_dir_config, &cache_socache_module);
cache_socache_conf *conf = ap_get_module_config(r->server->module_config,
&cache_socache_module);
cache_object_t *obj;
cache_socache_object_t *sobj;
apr_size_t total;
if (conf->provider == NULL) {
return DECLINED;
}
/* we don't support caching of range requests (yet) */
/* TODO: but we could */
if (r->status == HTTP_PARTIAL_CONTENT) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02345)
"URL %s partial content response not cached",
key);
return DECLINED;
}
/*
* We have a chicken and egg problem. We don't know until we
* attempt to store_headers just how big the response will be
* and whether it will fit in the cache limits set. But we
* need to make a decision now as to whether we plan to try.
* If we make the wrong decision, we could prevent another
* cache implementation, such as cache_disk, from getting the
* opportunity to cache, and that would be unfortunate.
*
* In a series of tests, from cheapest to most expensive,
* decide whether or not to ignore this attempt to cache,
* with a small margin just to be sure.
*/
if (len < 0) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02346)
"URL '%s' had no explicit size, ignoring", key);
return DECLINED;
}
if (len > dconf->max) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02347)
"URL '%s' body larger than limit, ignoring "
"(%" APR_OFF_T_FMT " > %" APR_OFF_T_FMT ")",
key, len, dconf->max);
return DECLINED;
}
/* estimate the total cached size, given current headers */
total = len + sizeof(cache_socache_info_t) + strlen(key);
if (APR_SUCCESS != store_table(r->headers_out, NULL, dconf->max, &total)
|| APR_SUCCESS != store_table(r->headers_in, NULL, dconf->max,
&total)) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02348)
"URL '%s' estimated headers size larger than limit, ignoring "
"(%" APR_SIZE_T_FMT " > %" APR_OFF_T_FMT ")",
key, total, dconf->max);
return DECLINED;
}
if (total >= dconf->max) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02349)
"URL '%s' body and headers larger than limit, ignoring "
"(%" APR_OFF_T_FMT " > %" APR_OFF_T_FMT ")",
key, len, dconf->max);
return DECLINED;
}
/* Allocate and initialize cache_object_t and cache_socache_object_t */
h->cache_obj = obj = apr_pcalloc(r->pool, sizeof(*obj));
obj->vobj = sobj = apr_pcalloc(r->pool, sizeof(*sobj));
obj->key = apr_pstrdup(r->pool, key);
sobj->key = obj->key;
sobj->name = obj->key;
return OK;
}
static int open_entity(cache_handle_t *h, request_rec *r, const char *key)
{
cache_socache_dir_conf *dconf =
ap_get_module_config(r->per_dir_config, &cache_socache_module);
cache_socache_conf *conf = ap_get_module_config(r->server->module_config,
&cache_socache_module);
apr_uint32_t format;
apr_size_t slider;
unsigned int buffer_len;
const char *nkey;
apr_status_t rc;
cache_object_t *obj;
cache_info *info;
cache_socache_object_t *sobj;
apr_size_t len;
nkey = NULL;
h->cache_obj = NULL;
if (!conf->provider || !conf->provider->socache_instance) {
return DECLINED;
}
/* Create and init the cache object */
obj = apr_pcalloc(r->pool, sizeof(cache_object_t));
sobj = apr_pcalloc(r->pool, sizeof(cache_socache_object_t));
info = &(obj->info);
/* Create a temporary pool for the buffer, and destroy it if something
* goes wrong so we don't have large buffers of unused memory hanging
* about for the lifetime of the response.
*/
apr_pool_create(&sobj->pool, r->pool);
sobj->buffer = apr_palloc(sobj->pool, dconf->max);
sobj->buffer_len = dconf->max;
/* attempt to retrieve the cached entry */
if (socache_mutex) {
apr_status_t status = apr_global_mutex_lock(socache_mutex);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(02350)
"could not acquire lock, ignoring: %s", obj->key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
}
buffer_len = sobj->buffer_len;
rc = conf->provider->socache_provider->retrieve(
conf->provider->socache_instance, r->server, (unsigned char *) key,
strlen(key), sobj->buffer, &buffer_len, r->pool);
if (socache_mutex) {
apr_status_t status = apr_global_mutex_unlock(socache_mutex);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(02351)
"could not release lock, ignoring: %s", obj->key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
}
if (rc != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rc, r, APLOGNO(02352)
"Key not found in cache: %s", key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
if (buffer_len >= sobj->buffer_len) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rc, r, APLOGNO(02353)
"Key found in cache but too big, ignoring: %s", key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
/* read the format from the cache file */
memcpy(&format, sobj->buffer, sizeof(format));
slider = sizeof(format);
if (format == CACHE_SOCACHE_VARY_FORMAT_VERSION) {
apr_array_header_t* varray;
apr_time_t expire;
memcpy(&expire, sobj->buffer + slider, sizeof(expire));
slider += sizeof(expire);
varray = apr_array_make(r->pool, 5, sizeof(char*));
rc = read_array(r, varray, sobj->buffer, buffer_len, &slider);
if (rc != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r, APLOGNO(02354)
"Cannot parse vary entry for key: %s", key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
nkey = regen_key(r->pool, r->headers_in, varray, key, &len);
/* attempt to retrieve the cached entry */
if (socache_mutex) {
apr_status_t status = apr_global_mutex_lock(socache_mutex);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(02355)
"could not acquire lock, ignoring: %s", obj->key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
}
buffer_len = sobj->buffer_len;
rc = conf->provider->socache_provider->retrieve(
conf->provider->socache_instance, r->server,
(unsigned char *) nkey, len, sobj->buffer,
&buffer_len, r->pool);
if (socache_mutex) {
apr_status_t status = apr_global_mutex_unlock(socache_mutex);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(02356)
"could not release lock, ignoring: %s", obj->key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
}
if (rc != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rc, r, APLOGNO(02357)
"Key not found in cache: %s", key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
if (buffer_len >= sobj->buffer_len) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rc, r, APLOGNO(02358)
"Key found in cache but too big, ignoring: %s", key);
goto fail;
}
}
else if (format != CACHE_SOCACHE_DISK_FORMAT_VERSION) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02359)
"Key '%s' found in cache has version %d, expected %d, ignoring",
key, format, CACHE_SOCACHE_DISK_FORMAT_VERSION);
goto fail;
}
else {
nkey = key;
}
obj->key = nkey;
sobj->key = nkey;
sobj->name = key;
if (buffer_len >= sizeof(cache_socache_info_t)) {
memcpy(&sobj->socache_info, sobj->buffer, sizeof(cache_socache_info_t));
}
else {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r, APLOGNO(02360)
"Cache entry for key '%s' too short, removing", nkey);
goto fail;
}
slider = sizeof(cache_socache_info_t);
/* Store it away so we can get it later. */
info->status = sobj->socache_info.status;
info->date = sobj->socache_info.date;
info->expire = sobj->socache_info.expire;
info->request_time = sobj->socache_info.request_time;
info->response_time = sobj->socache_info.response_time;
memcpy(&info->control, &sobj->socache_info.control, sizeof(cache_control_t));
if (sobj->socache_info.name_len <= buffer_len - slider) {
if (strncmp((const char *) sobj->buffer + slider, sobj->name,
sobj->socache_info.name_len)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r, APLOGNO(02361)
"Cache entry for key '%s' URL mismatch, ignoring", nkey);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
slider += sobj->socache_info.name_len;
}
else {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r, APLOGNO(02362)
"Cache entry for key '%s' too short, removing", nkey);
goto fail;
}
/* Is this a cached HEAD request? */
if (sobj->socache_info.header_only && !r->header_only) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, r, APLOGNO(02363)
"HEAD request cached, non-HEAD requested, ignoring: %s",
sobj->key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
h->req_hdrs = apr_table_make(r->pool, 20);
h->resp_hdrs = apr_table_make(r->pool, 20);
/* Call routine to read the header lines/status line */
if (APR_SUCCESS != read_table(h, r, h->resp_hdrs, sobj->buffer, buffer_len,
&slider)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r, APLOGNO(02364)
"Cache entry for key '%s' response headers unreadable, removing", nkey);
goto fail;
}
if (APR_SUCCESS != read_table(h, r, h->req_hdrs, sobj->buffer, buffer_len,
&slider)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r, APLOGNO(02365)
"Cache entry for key '%s' request headers unreadable, removing", nkey);
goto fail;
}
/* Retrieve the body if we have one */
sobj->body = apr_brigade_create(r->pool, r->connection->bucket_alloc);
len = buffer_len - slider;
/*
* Optimisation: if the body is small, we want to make a
* copy of the body and free the temporary pool, as we
* don't want large blocks of unused memory hanging around
* to the end of the response. In contrast, if the body is
* large, we would rather leave the body where it is in the
* temporary pool, and save ourselves the copy.
*/
if (len * 2 > dconf->max) {
apr_bucket *e;
/* large - use the brigade as is, we're done */
e = apr_bucket_immortal_create((const char *) sobj->buffer + slider,
len, r->connection->bucket_alloc);
APR_BRIGADE_INSERT_TAIL(sobj->body, e);
}
else {
/* small - make a copy of the data... */
apr_brigade_write(sobj->body, NULL, NULL, (const char *) sobj->buffer
+ slider, len);
/* ...and get rid of the large memory buffer */
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
}
/* make the configuration stick */
h->cache_obj = obj;
obj->vobj = sobj;
return OK;
fail:
if (socache_mutex) {
apr_status_t status = apr_global_mutex_lock(socache_mutex);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(02366)
"could not acquire lock, ignoring: %s", obj->key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
}
conf->provider->socache_provider->remove(
conf->provider->socache_instance, r->server,
(unsigned char *) nkey, strlen(nkey), r->pool);
if (socache_mutex) {
apr_status_t status = apr_global_mutex_unlock(socache_mutex);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(02367)
"could not release lock, ignoring: %s", obj->key);
}
}
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
static int remove_entity(cache_handle_t *h)
{
/* Null out the cache object pointer so next time we start from scratch */
h->cache_obj = NULL;
return OK;
}
static int remove_url(cache_handle_t *h, request_rec *r)
{
cache_socache_conf *conf = ap_get_module_config(r->server->module_config,
&cache_socache_module);
cache_socache_object_t *sobj;
sobj = (cache_socache_object_t *) h->cache_obj->vobj;
if (!sobj) {
return DECLINED;
}
/* Remove the key from the cache */
if (socache_mutex) {
apr_status_t status = apr_global_mutex_lock(socache_mutex);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(02368)
"could not acquire lock, ignoring: %s", sobj->key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
}
conf->provider->socache_provider->remove(conf->provider->socache_instance,
r->server, (unsigned char *) sobj->key, strlen(sobj->key), r->pool);
if (socache_mutex) {
apr_status_t status = apr_global_mutex_unlock(socache_mutex);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(02369)
"could not release lock, ignoring: %s", sobj->key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return DECLINED;
}
}
return OK;
}
static apr_status_t recall_headers(cache_handle_t *h, request_rec *r)
{
/* we recalled the headers during open_entity, so do nothing */
return APR_SUCCESS;
}
static apr_status_t recall_body(cache_handle_t *h, apr_pool_t *p,
apr_bucket_brigade *bb)
{
cache_socache_object_t *sobj = (cache_socache_object_t*) h->cache_obj->vobj;
apr_bucket *e;
e = APR_BRIGADE_FIRST(sobj->body);
if (e != APR_BRIGADE_SENTINEL(sobj->body)) {
APR_BUCKET_REMOVE(e);
APR_BRIGADE_INSERT_TAIL(bb, e);
}
return APR_SUCCESS;
}
static apr_status_t store_headers(cache_handle_t *h, request_rec *r,
cache_info *info)
{
cache_socache_dir_conf *dconf =
ap_get_module_config(r->per_dir_config, &cache_socache_module);
cache_socache_conf *conf = ap_get_module_config(r->server->module_config,
&cache_socache_module);
apr_size_t slider;
apr_status_t rv;
cache_object_t *obj = h->cache_obj;
cache_socache_object_t *sobj = (cache_socache_object_t*) obj->vobj;
cache_socache_info_t *socache_info;
memcpy(&h->cache_obj->info, info, sizeof(cache_info));
if (r->headers_out) {
sobj->headers_out = ap_cache_cacheable_headers_out(r);
}
if (r->headers_in) {
sobj->headers_in = ap_cache_cacheable_headers_in(r);
}
sobj->expire
= obj->info.expire > r->request_time + dconf->maxtime ? r->request_time
+ dconf->maxtime
: obj->info.expire + dconf->mintime;
apr_pool_create(&sobj->pool, r->pool);
sobj->buffer = apr_palloc(sobj->pool, dconf->max);
sobj->buffer_len = dconf->max;
socache_info = (cache_socache_info_t *) sobj->buffer;
if (sobj->headers_out) {
const char *vary;
vary = apr_table_get(sobj->headers_out, "Vary");
if (vary) {
apr_array_header_t* varray;
apr_uint32_t format = CACHE_SOCACHE_VARY_FORMAT_VERSION;
memcpy(sobj->buffer, &format, sizeof(format));
slider = sizeof(format);
memcpy(sobj->buffer + slider, &obj->info.expire,
sizeof(obj->info.expire));
slider += sizeof(obj->info.expire);
varray = apr_array_make(r->pool, 6, sizeof(char*));
tokens_to_array(r->pool, vary, varray);
if (APR_SUCCESS != (rv = store_array(varray, sobj->buffer,
sobj->buffer_len, &slider))) {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(02370)
"buffer too small for Vary array, caching aborted: %s",
obj->key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return rv;
}
if (socache_mutex) {
apr_status_t status = apr_global_mutex_lock(socache_mutex);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(02371)
"could not acquire lock, ignoring: %s", obj->key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return status;
}
}
rv = conf->provider->socache_provider->store(
conf->provider->socache_instance, r->server,
(unsigned char *) obj->key, strlen(obj->key), sobj->expire,
(unsigned char *) sobj->buffer, (unsigned int) slider,
sobj->pool);
if (socache_mutex) {
apr_status_t status = apr_global_mutex_unlock(socache_mutex);
if (status != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(02372)
"could not release lock, ignoring: %s", obj->key);
}
}
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rv, r, APLOGNO(02373)
"Vary not written to cache, ignoring: %s", obj->key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return rv;
}
obj->key = sobj->key = regen_key(r->pool, sobj->headers_in, varray,
sobj->name, NULL);
}
}
socache_info->format = CACHE_SOCACHE_DISK_FORMAT_VERSION;
socache_info->date = obj->info.date;
socache_info->expire = obj->info.expire;
socache_info->entity_version = sobj->socache_info.entity_version++;
socache_info->request_time = obj->info.request_time;
socache_info->response_time = obj->info.response_time;
socache_info->status = obj->info.status;
if (r->header_only && r->status != HTTP_NOT_MODIFIED) {
socache_info->header_only = 1;
}
else {
socache_info->header_only = sobj->socache_info.header_only;
}
socache_info->name_len = strlen(sobj->name);
memcpy(&socache_info->control, &obj->info.control, sizeof(cache_control_t));
slider = sizeof(cache_socache_info_t);
if (slider + socache_info->name_len >= sobj->buffer_len) {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(02374)
"cache buffer too small for name: %s",
sobj->name);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return APR_EGENERAL;
}
memcpy(sobj->buffer + slider, sobj->name, socache_info->name_len);
slider += socache_info->name_len;
if (sobj->headers_out) {
if (APR_SUCCESS != store_table(sobj->headers_out, sobj->buffer,
sobj->buffer_len, &slider)) {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(02375)
"out-headers didn't fit in buffer: %s", sobj->name);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return APR_EGENERAL;
}
}
/* Parse the vary header and dump those fields from the headers_in. */
/* TODO: Make call to the same thing cache_select calls to crack Vary. */
if (sobj->headers_in) {
if (APR_SUCCESS != store_table(sobj->headers_in, sobj->buffer,
sobj->buffer_len, &slider)) {
ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(02376)
"in-headers didn't fit in buffer %s",
sobj->key);
apr_pool_destroy(sobj->pool);
sobj->pool = NULL;
return APR_EGENERAL;
}
}
sobj->body_offset = slider;
return APR_SUCCESS;
}
static apr_status_t store_body(cache_handle_t *h, request_rec *r,
apr_bucket_brigade *in, apr_bucket_brigade *out)
{
apr_bucket *e;
apr_status_t rv = APR_SUCCESS;
cache_socache_object_t *sobj =
(cache_socache_object_t *) h->cache_obj->vobj;
cache_socache_dir_conf *dconf =
ap_get_module_config(r->per_dir_config, &cache_socache_module);
int seen_eos = 0;
if (!sobj->offset) {
sobj->offset = dconf->readsize;
}
if (!sobj->timeout && dconf->readtime) {
sobj->timeout = apr_time_now() + dconf->readtime;
}
if (!sobj->newbody) {
sobj->body_length = 0;
sobj->newbody = 1;
}
if (sobj->offset) {
apr_brigade_partition(in, sobj->offset, &e);
}
while (APR_SUCCESS == rv && !APR_BRIGADE_EMPTY(in)) {
const char *str;
apr_size_t length;
e = APR_BRIGADE_FIRST(in);
/* are we done completely? if so, pass any trailing buckets right through */
if (sobj->done || !sobj->pool) {
APR_BUCKET_REMOVE(e);
APR_BRIGADE_INSERT_TAIL(out, e);
continue;
}
/* have we seen eos yet? */
if (APR_BUCKET_IS_EOS(e)) {
seen_eos = 1;
sobj->done = 1;
APR_BUCKET_REMOVE(e);
APR_BRIGADE_INSERT_TAIL(out, e);
break;
}
/* honour flush buckets, we'll get called again */
if (APR_BUCKET_IS_FLUSH(e)) {
APR_BUCKET_REMOVE(e);
APR_BRIGADE_INSERT_TAIL(out, e);
break;
}
/* metadata buckets are preserved as is */
if (APR_BUCKET_IS_METADATA(e)) {
APR_BUCKET_REMOVE(e);
APR_BRIGADE_INSERT_TAIL(out, e);
continue;
}
/* read the bucket, write to the cache */