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/*
* Cache management
*
* Copyright 2017 HAProxy Technologies
* William Lallemand <wlallemand@haproxy.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <import/eb32tree.h>
#include <import/sha1.h>
#include <haproxy/action-t.h>
#include <haproxy/api.h>
#include <haproxy/applet.h>
#include <haproxy/cfgparse.h>
#include <haproxy/channel.h>
#include <haproxy/cli.h>
#include <haproxy/errors.h>
#include <haproxy/filters.h>
#include <haproxy/hash.h>
#include <haproxy/http.h>
#include <haproxy/http_ana.h>
#include <haproxy/http_htx.h>
#include <haproxy/http_rules.h>
#include <haproxy/htx.h>
#include <haproxy/net_helper.h>
#include <haproxy/proxy.h>
#include <haproxy/sample.h>
#include <haproxy/sc_strm.h>
#include <haproxy/shctx.h>
#include <haproxy/stconn.h>
#include <haproxy/stream.h>
#include <haproxy/tools.h>
#include <haproxy/xxhash.h>
#define CACHE_FLT_F_IMPLICIT_DECL 0x00000001 /* The cache filtre was implicitly declared (ie without
* the filter keyword) */
#define CACHE_FLT_INIT 0x00000002 /* Whether the cache name was freed. */
static uint64_t cache_hash_seed = 0;
const char *cache_store_flt_id = "cache store filter";
extern struct applet http_cache_applet;
struct flt_ops cache_ops;
struct cache_tree {
struct eb_root entries; /* head of cache entries based on keys */
__decl_thread(HA_RWLOCK_T lock);
struct list cleanup_list;
__decl_thread(HA_SPINLOCK_T cleanup_lock);
} ALIGNED(64);
struct cache {
struct cache_tree trees[CACHE_TREE_NUM];
struct list list; /* cache linked list */
unsigned int maxage; /* max-age */
unsigned int maxblocks;
unsigned int maxobjsz; /* max-object-size (in bytes) */
unsigned int max_secondary_entries; /* maximum number of secondary entries with the same primary hash */
uint8_t vary_processing_enabled; /* boolean : manage Vary header (disabled by default) */
char id[33]; /* cache name */
};
/* the appctx context of a cache applet, stored in appctx->svcctx */
struct cache_appctx {
struct cache *cache;
struct cache_tree *cache_tree;
struct cache_entry *entry; /* Entry to be sent from cache. */
unsigned int sent; /* The number of bytes already sent for this cache entry. */
unsigned int offset; /* start offset of remaining data relative to beginning of the next block */
unsigned int rem_data; /* Remaining bytes for the last data block (HTX only, 0 means process next block) */
unsigned int send_notmodified:1; /* In case of conditional request, we might want to send a "304 Not Modified" response instead of the stored data. */
unsigned int unused:31;
/* 4 bytes hole here */
struct shared_block *next; /* The next block of data to be sent for this cache entry. */
};
/* cache config for filters */
struct cache_flt_conf {
union {
struct cache *cache; /* cache used by the filter */
char *name; /* cache name used during conf parsing */
} c;
unsigned int flags; /* CACHE_FLT_F_* */
};
/* CLI context used during "show cache" */
struct show_cache_ctx {
struct cache *cache;
struct cache_tree *cache_tree;
uint next_key;
};
/*
* Vary-related structures and functions
*/
enum vary_header_bit {
VARY_ACCEPT_ENCODING = (1 << 0),
VARY_REFERER = (1 << 1),
VARY_ORIGIN = (1 << 2),
VARY_LAST /* should always be last */
};
/*
* Encoding list extracted from
* https://www.iana.org/assignments/http-parameters/http-parameters.xhtml
* and RFC7231#5.3.4.
*/
enum vary_encoding {
VARY_ENCODING_GZIP = (1 << 0),
VARY_ENCODING_DEFLATE = (1 << 1),
VARY_ENCODING_BR = (1 << 2),
VARY_ENCODING_COMPRESS = (1 << 3),
VARY_ENCODING_AES128GCM = (1 << 4),
VARY_ENCODING_EXI = (1 << 5),
VARY_ENCODING_PACK200_GZIP = (1 << 6),
VARY_ENCODING_ZSTD = (1 << 7),
VARY_ENCODING_IDENTITY = (1 << 8),
VARY_ENCODING_STAR = (1 << 9),
VARY_ENCODING_OTHER = (1 << 10)
};
struct vary_hashing_information {
struct ist hdr_name; /* Header name */
enum vary_header_bit value; /* Bit representing the header in a vary signature */
unsigned int hash_length; /* Size of the sub hash for this header's value */
int(*norm_fn)(struct htx*,struct ist hdr_name,char* buf,unsigned int* buf_len); /* Normalization function */
int(*cmp_fn)(const void *ref, const void *new, unsigned int len); /* Comparison function, should return 0 if the hashes are alike */
};
static int http_request_prebuild_full_secondary_key(struct stream *s);
static int http_request_build_secondary_key(struct stream *s, int vary_signature);
static int http_request_reduce_secondary_key(unsigned int vary_signature,
char prebuilt_key[HTTP_CACHE_SEC_KEY_LEN]);
static int parse_encoding_value(struct ist value, unsigned int *encoding_value,
unsigned int *has_null_weight);
static int accept_encoding_normalizer(struct htx *htx, struct ist hdr_name,
char *buf, unsigned int *buf_len);
static int default_normalizer(struct htx *htx, struct ist hdr_name,
char *buf, unsigned int *buf_len);
static int accept_encoding_bitmap_cmp(const void *ref, const void *new, unsigned int len);
/* Warning : do not forget to update HTTP_CACHE_SEC_KEY_LEN when new items are
* added to this array. */
const struct vary_hashing_information vary_information[] = {
{ IST("accept-encoding"), VARY_ACCEPT_ENCODING, sizeof(uint32_t), &accept_encoding_normalizer, &accept_encoding_bitmap_cmp },
{ IST("referer"), VARY_REFERER, sizeof(uint64_t), &default_normalizer, NULL },
{ IST("origin"), VARY_ORIGIN, sizeof(uint64_t), &default_normalizer, NULL },
};
static inline void cache_rdlock(struct cache_tree *cache)
{
HA_RWLOCK_RDLOCK(CACHE_LOCK, &cache->lock);
}
static inline void cache_rdunlock(struct cache_tree *cache)
{
HA_RWLOCK_RDUNLOCK(CACHE_LOCK, &cache->lock);
}
static inline void cache_wrlock(struct cache_tree *cache)
{
HA_RWLOCK_WRLOCK(CACHE_LOCK, &cache->lock);
}
static inline void cache_wrunlock(struct cache_tree *cache)
{
HA_RWLOCK_WRUNLOCK(CACHE_LOCK, &cache->lock);
}
/*
* cache ctx for filters
*/
struct cache_st {
struct shared_block *first_block;
struct list detached_head;
};
#define DEFAULT_MAX_SECONDARY_ENTRY 10
struct cache_entry {
unsigned int complete; /* An entry won't be valid until complete is not null. */
unsigned int latest_validation; /* latest validation date */
unsigned int expire; /* expiration date (wall clock time) */
unsigned int age; /* Origin server "Age" header value */
unsigned int body_size; /* Size of the body */
int refcount;
struct eb32_node eb; /* ebtree node used to hold the cache object */
char hash[20];
struct list cleanup_list;/* List used between the cache_free_blocks and cache_reserve_finish calls */
char secondary_key[HTTP_CACHE_SEC_KEY_LEN]; /* Optional secondary key. */
unsigned int secondary_key_signature; /* Bitfield of the HTTP headers that should be used
* to build secondary keys for this cache entry. */
unsigned int secondary_entries_count; /* Should only be filled in the last entry of a list of dup entries */
unsigned int last_clear_ts; /* Timestamp of the last call to clear_expired_duplicates. */
unsigned int etag_length; /* Length of the ETag value (if one was found in the response). */
unsigned int etag_offset; /* Offset of the ETag value in the data buffer. */
time_t last_modified; /* Origin server "Last-Modified" header value converted in
* seconds since epoch. If no "Last-Modified"
* header is found, use "Date" header value,
* otherwise use reception time. This field will
* be used in case of an "If-Modified-Since"-based
* conditional request. */
unsigned char data[0];
};
#define CACHE_BLOCKSIZE 1024
#define CACHE_ENTRY_MAX_AGE 2147483648U
static struct list caches = LIST_HEAD_INIT(caches);
static struct list caches_config = LIST_HEAD_INIT(caches_config); /* cache config to init */
static struct cache *tmp_cache_config = NULL;
DECLARE_STATIC_TYPED_POOL(pool_head_cache_st, "cache_st", struct cache_st);
static struct eb32_node *insert_entry(struct cache *cache, struct cache_tree *tree, struct cache_entry *new_entry);
static void delete_entry(struct cache_entry *del_entry);
static inline void release_entry_locked(struct cache_tree *cache, struct cache_entry *entry);
static inline void release_entry_unlocked(struct cache_tree *cache, struct cache_entry *entry);
/*
* Find a cache_entry in the <cache>'s tree that has the hash <hash>.
* If <delete_expired> is 0 then the entry is left untouched if it is found but
* is already expired, and NULL is returned. Otherwise, the expired entry is
* removed from the tree and NULL is returned.
* Returns a valid (not expired) cache_tree pointer.
* The returned entry is not retained, it should be explicitly retained only
* when necessary.
*
* This function must be called under a cache lock, either read if
* delete_expired==0, write otherwise.
*/
struct cache_entry *get_entry(struct cache_tree *cache_tree, char *hash, int delete_expired)
{
struct eb32_node *node;
struct cache_entry *entry;
node = eb32_lookup(&cache_tree->entries, read_u32(hash));
if (!node)
return NULL;
entry = eb32_entry(node, struct cache_entry, eb);
/* if that's not the right node */
if (memcmp(entry->hash, hash, sizeof(entry->hash)))
return NULL;
if (entry->expire > date.tv_sec) {
return entry;
} else if (delete_expired) {
release_entry_locked(cache_tree, entry);
}
return NULL;
}
/*
* Increment a cache_entry's reference counter.
*/
static void retain_entry(struct cache_entry *entry)
{
if (entry)
HA_ATOMIC_INC(&entry->refcount);
}
/*
* Decrement a cache_entry's reference counter and remove it from the <cache>'s
* tree if the reference counter becomes 0.
* If <needs_locking> is 0 then the cache lock was already taken by the caller,
* otherwise it must be taken in write mode before actually deleting the entry.
*/
static void release_entry(struct cache_tree *cache, struct cache_entry *entry, int needs_locking)
{
if (!entry)
return;
if (HA_ATOMIC_SUB_FETCH(&entry->refcount, 1) <= 0) {
if (needs_locking) {
cache_wrlock(cache);
/* The value might have changed between the last time we
* checked it and now, we need to recheck it just in
* case.
*/
if (HA_ATOMIC_LOAD(&entry->refcount) > 0) {
cache_wrunlock(cache);
return;
}
}
delete_entry(entry);
if (needs_locking) {
cache_wrunlock(cache);
}
}
}
/*
* Decrement a cache_entry's reference counter and remove it from the <cache>'s
* tree if the reference counter becomes 0.
* This function must be called under the cache lock in write mode.
*/
static inline void release_entry_locked(struct cache_tree *cache, struct cache_entry *entry)
{
release_entry(cache, entry, 0);
}
/*
* Decrement a cache_entry's reference counter and remove it from the <cache>'s
* tree if the reference counter becomes 0.
* This function must not be called under the cache lock or the shctx lock. The
* cache lock might be taken in write mode (if the entry gets deleted).
*/
static inline void release_entry_unlocked(struct cache_tree *cache, struct cache_entry *entry)
{
release_entry(cache, entry, 1);
}
/*
* Compare a newly built secondary key to the one found in a cache_entry.
* Every sub-part of the key is compared to the reference through the dedicated
* comparison function of the sub-part (that might do more than a simple
* memcmp).
* Returns 0 if the keys are alike.
*/
static int secondary_key_cmp(const char *ref_key, const char *new_key)
{
int retval = 0;
size_t idx = 0;
unsigned int offset = 0;
const struct vary_hashing_information *info;
for (idx = 0; idx < sizeof(vary_information)/sizeof(*vary_information) && !retval; ++idx) {
info = &vary_information[idx];
if (info->cmp_fn)
retval = info->cmp_fn(&ref_key[offset], &new_key[offset], info->hash_length);
else
retval = memcmp(&ref_key[offset], &new_key[offset], info->hash_length);
offset += info->hash_length;
}
return retval;
}
/*
* There can be multiple entries with the same primary key in the ebtree so in
* order to get the proper one out of the list, we use a secondary_key.
* This function simply iterates over all the entries with the same primary_key
* until it finds the right one.
* If <delete_expired> is 0 then the entry is left untouched if it is found but
* is already expired, and NULL is returned. Otherwise, the expired entry is
* removed from the tree and NULL is returned.
* Returns the cache_entry in case of success, NULL otherwise.
*
* This function must be called under a cache lock, either read if
* delete_expired==0, write otherwise.
*/
struct cache_entry *get_secondary_entry(struct cache_tree *cache, struct cache_entry *entry,
const char *secondary_key, int delete_expired)
{
struct eb32_node *node = &entry->eb;
if (!entry->secondary_key_signature)
return NULL;
while (entry && secondary_key_cmp(entry->secondary_key, secondary_key) != 0) {
node = eb32_next_dup(node);
/* Make the best use of this iteration and clear expired entries
* when we find them. Calling delete_entry would be too costly
* so we simply call eb32_delete. The secondary_entry count will
* be updated when we try to insert a new entry to this list. */
if (entry->expire <= date.tv_sec && delete_expired) {
release_entry_locked(cache, entry);
}
entry = node ? eb32_entry(node, struct cache_entry, eb) : NULL;
}
/* Expired entry */
if (entry && entry->expire <= date.tv_sec) {
if (delete_expired) {
release_entry_locked(cache, entry);
}
entry = NULL;
}
return entry;
}
static inline struct cache_tree *get_cache_tree_from_hash(struct cache *cache, unsigned int hash)
{
if (!cache)
return NULL;
return &cache->trees[hash % CACHE_TREE_NUM];
}
/*
* Remove all expired entries from a list of duplicates.
* Return the number of alive entries in the list and sets dup_tail to the
* current last item of the list.
*
* This function must be called under a cache write lock.
*/
static unsigned int clear_expired_duplicates(struct cache_tree *cache, struct eb32_node **dup_tail)
{
unsigned int entry_count = 0;
struct cache_entry *entry = NULL;
struct eb32_node *prev = *dup_tail;
struct eb32_node *tail = NULL;
while (prev) {
entry = container_of(prev, struct cache_entry, eb);
prev = eb32_prev_dup(prev);
if (entry->expire <= date.tv_sec) {
release_entry_locked(cache, entry);
}
else {
if (!tail)
tail = &entry->eb;
++entry_count;
}
}
*dup_tail = tail;
return entry_count;
}
/*
* This function inserts a cache_entry in the cache's ebtree. In case of
* duplicate entries (vary), it then checks that the number of entries did not
* reach the max number of secondary entries. If this entry should not have been
* created, remove it.
* In the regular case (unique entries), this function does not do more than a
* simple insert. In case of secondary entries, it will at most cost an
* insertion+max_sec_entries time checks and entry deletion.
* Returns the newly inserted node in case of success, NULL otherwise.
*
* This function must be called under a cache write lock.
*/
static struct eb32_node *insert_entry(struct cache *cache, struct cache_tree *tree, struct cache_entry *new_entry)
{
struct eb32_node *prev = NULL;
struct cache_entry *entry = NULL;
unsigned int entry_count = 0;
unsigned int last_clear_ts = date.tv_sec;
struct eb32_node *node = eb32_insert(&tree->entries, &new_entry->eb);
new_entry->refcount = 1;
/* We should not have multiple entries with the same primary key unless
* the entry has a non null vary signature. */
if (!new_entry->secondary_key_signature)
return node;
prev = eb32_prev_dup(node);
if (prev != NULL) {
/* The last entry of a duplicate list should contain the current
* number of entries in the list. */
entry = container_of(prev, struct cache_entry, eb);
entry_count = entry->secondary_entries_count;
last_clear_ts = entry->last_clear_ts;
if (entry_count >= cache->max_secondary_entries) {
/* Some entries of the duplicate list might be expired so
* we will iterate over all the items in order to free some
* space. In order to avoid going over the same list too
* often, we first check the timestamp of the last check
* performed. */
if (last_clear_ts == date.tv_sec) {
/* Too many entries for this primary key, clear the
* one that was inserted. */
release_entry_locked(tree, new_entry);
return NULL;
}
entry_count = clear_expired_duplicates(tree, &prev);
if (entry_count >= cache->max_secondary_entries) {
/* Still too many entries for this primary key, delete
* the newly inserted one. */
entry = container_of(prev, struct cache_entry, eb);
entry->last_clear_ts = date.tv_sec;
release_entry_locked(tree, new_entry);
return NULL;
}
}
}
new_entry->secondary_entries_count = entry_count + 1;
new_entry->last_clear_ts = last_clear_ts;
return node;
}
/*
* This function removes an entry from the ebtree. If the entry was a duplicate
* (in case of Vary), it updates the secondary entry counter in another
* duplicate entry (the last entry of the dup list).
*
* This function must be called under a cache write lock.
*/
static void delete_entry(struct cache_entry *del_entry)
{
struct eb32_node *prev = NULL, *next = NULL;
struct cache_entry *entry = NULL;
struct eb32_node *last = NULL;
/* The entry might have been removed from the cache before. In such a
* case calling eb32_next_dup would crash. */
if (del_entry->secondary_key_signature && del_entry->eb.key != 0) {
next = &del_entry->eb;
/* Look for last entry of the duplicates list. */
while ((next = eb32_next_dup(next))) {
last = next;
}
if (last) {
entry = container_of(last, struct cache_entry, eb);
--entry->secondary_entries_count;
}
else {
/* The current entry is the last one, look for the
* previous one to update its counter. */
prev = eb32_prev_dup(&del_entry->eb);
if (prev) {
entry = container_of(prev, struct cache_entry, eb);
entry->secondary_entries_count = del_entry->secondary_entries_count - 1;
}
}
}
eb32_delete(&del_entry->eb);
del_entry->eb.key = 0;
}
static inline struct shared_context *shctx_ptr(struct cache *cache)
{
return (struct shared_context *)((unsigned char *)cache - offsetof(struct shared_context, data));
}
static inline struct shared_block *block_ptr(struct cache_entry *entry)
{
return (struct shared_block *)((unsigned char *)entry - offsetof(struct shared_block, data));
}
static int
cache_store_init(struct proxy *px, struct flt_conf *fconf)
{
fconf->flags |= FLT_CFG_FL_HTX;
return 0;
}
static void
cache_store_deinit(struct proxy *px, struct flt_conf *fconf)
{
struct cache_flt_conf *cconf = fconf->conf;
if (!(cconf->flags & CACHE_FLT_INIT))
free(cconf->c.name);
free(cconf);
}
static int
cache_store_check(struct proxy *px, struct flt_conf *fconf)
{
struct cache_flt_conf *cconf = fconf->conf;
struct flt_conf *f;
struct cache *cache;
int comp = 0;
/* Find the cache corresponding to the name in the filter config. The
* cache will not be referenced now in the filter config because it is
* not fully allocated. This step will be performed during the cache
* post_check.
*/
list_for_each_entry(cache, &caches_config, list) {
if (strcmp(cache->id, cconf->c.name) == 0)
goto found;
}
ha_alert("config: %s '%s': unable to find the cache '%s' referenced by the filter 'cache'.\n",
proxy_type_str(px), px->id, (char *)cconf->c.name);
return 1;
found:
/* Here <cache> points on the cache the filter must use and <cconf>
* points on the cache filter configuration. */
/* Check all filters for proxy <px> to know if the compression is
* enabled and if it is after the cache. When the compression is before
* the cache, an error is returned. Also check if the cache filter must
* be explicitly declaired or not. */
list_for_each_entry(f, &px->filter_configs, list) {
if (f == fconf) {
/* The compression filter must be evaluated after the cache. */
if (comp) {
ha_alert("config: %s '%s': unable to enable the compression filter before "
"the cache '%s'.\n", proxy_type_str(px), px->id, cache->id);
return 1;
}
}
else if (f->id == http_comp_flt_id)
comp = 1;
else if (f->id == fcgi_flt_id)
continue;
else if ((f->id != fconf->id) && (cconf->flags & CACHE_FLT_F_IMPLICIT_DECL)) {
/* Implicit declaration is only allowed with the
* compression and fcgi. For other filters, an implicit
* declaration is required. */
ha_alert("config: %s '%s': require an explicit filter declaration "
"to use the cache '%s'.\n", proxy_type_str(px), px->id, cache->id);
return 1;
}
}
return 0;
}
static int
cache_store_strm_init(struct stream *s, struct filter *filter)
{
struct cache_st *st;
st = pool_alloc(pool_head_cache_st);
if (st == NULL)
return -1;
st->first_block = NULL;
filter->ctx = st;
/* Register post-analyzer on AN_RES_WAIT_HTTP */
filter->post_analyzers |= AN_RES_WAIT_HTTP;
return 1;
}
static void
cache_store_strm_deinit(struct stream *s, struct filter *filter)
{
struct cache_st *st = filter->ctx;
struct cache_flt_conf *cconf = FLT_CONF(filter);
struct cache *cache = cconf->c.cache;
struct shared_context *shctx = shctx_ptr(cache);
/* Everything should be released in the http_end filter, but we need to do it
* there too, in case of errors */
if (st && st->first_block) {
struct cache_entry *object = (struct cache_entry *)st->first_block->data;
if (!object->complete) {
/* The stream was closed but the 'complete' flag was not
* set which means that cache_store_http_end was not
* called. The stream must have been closed before we
* could store the full answer in the cache.
*/
release_entry_unlocked(&cache->trees[object->eb.key % CACHE_TREE_NUM], object);
}
shctx_wrlock(shctx);
shctx_row_reattach(shctx, st->first_block);
shctx_wrunlock(shctx);
}
if (st) {
pool_free(pool_head_cache_st, st);
filter->ctx = NULL;
}
}
static int
cache_store_post_analyze(struct stream *s, struct filter *filter, struct channel *chn,
unsigned an_bit)
{
struct http_txn *txn = s->txn;
struct http_msg *msg = &txn->rsp;
struct cache_st *st = filter->ctx;
if (an_bit != AN_RES_WAIT_HTTP)
goto end;
/* Here we need to check if any compression filter precedes the cache
* filter. This is only possible when the compression is configured in
* the frontend while the cache filter is configured on the
* backend. This case cannot be detected during HAProxy startup. So in
* such cases, the cache is disabled.
*/
if (st && (msg->flags & HTTP_MSGF_COMPRESSING)) {
pool_free(pool_head_cache_st, st);
filter->ctx = NULL;
}
end:
return 1;
}
static int
cache_store_http_headers(struct stream *s, struct filter *filter, struct http_msg *msg)
{
struct cache_st *st = filter->ctx;
if (!(msg->chn->flags & CF_ISRESP) || !st)
return 1;
if (st->first_block)
register_data_filter(s, msg->chn, filter);
return 1;
}
static inline void disable_cache_entry(struct cache_st *st,
struct filter *filter, struct shared_context *shctx)
{
struct cache_entry *object;
struct cache *cache = (struct cache*)shctx->data;
object = (struct cache_entry *)st->first_block->data;
filter->ctx = NULL; /* disable cache */
release_entry_unlocked(&cache->trees[object->eb.key % CACHE_TREE_NUM], object);
shctx_wrlock(shctx);
shctx_row_reattach(shctx, st->first_block);
shctx_wrunlock(shctx);
pool_free(pool_head_cache_st, st);
}
static int
cache_store_http_payload(struct stream *s, struct filter *filter, struct http_msg *msg,
unsigned int offset, unsigned int len)
{
struct cache_flt_conf *cconf = FLT_CONF(filter);
struct shared_context *shctx = shctx_ptr(cconf->c.cache);
struct cache_st *st = filter->ctx;
struct htx *htx = htxbuf(&msg->chn->buf);
struct htx_blk *blk;
struct shared_block *fb;
struct htx_ret htxret;
size_t data_len = 0;
unsigned int orig_len, to_forward;
int ret;
if (!len)
return len;
if (!st->first_block) {
unregister_data_filter(s, msg->chn, filter);
return len;
}
chunk_reset(&trash);
orig_len = len;
to_forward = 0;
htxret = htx_find_offset(htx, offset);
blk = htxret.blk;
offset = htxret.ret;
for (; blk && len; blk = htx_get_next_blk(htx, blk)) {
enum htx_blk_type type = htx_get_blk_type(blk);
uint32_t info, sz = htx_get_blksz(blk);
struct ist v;
switch (type) {
case HTX_BLK_UNUSED:
break;
case HTX_BLK_DATA:
v = htx_get_blk_value(htx, blk);
v = istadv(v, offset);
v = isttrim(v, len);
info = (type << 28) + v.len;
chunk_memcat(&trash, (char *)&info, sizeof(info));
chunk_istcat(&trash, v);
to_forward += v.len;
data_len += v.len;
len -= v.len;
break;
default:
/* Here offset must always be 0 because only
* DATA blocks can be partially transferred. */
if (offset)
goto no_cache;
if (sz > len)
goto end;
chunk_memcat(&trash, (char *)&blk->info, sizeof(blk->info));
chunk_memcat(&trash, htx_get_blk_ptr(htx, blk), sz);
to_forward += sz;
len -= sz;
break;
}
offset = 0;
}
end:
fb = shctx_row_reserve_hot(shctx, st->first_block, trash.data);
if (!fb) {
goto no_cache;
}
ASSUME_NONNULL((struct cache_entry *)st->first_block->data)->body_size += data_len;
ret = shctx_row_data_append(shctx, st->first_block,
(unsigned char *)b_head(&trash), b_data(&trash));
if (ret < 0)
goto no_cache;
return to_forward;
no_cache:
disable_cache_entry(st, filter, shctx);
unregister_data_filter(s, msg->chn, filter);
return orig_len;
}
static int
cache_store_http_end(struct stream *s, struct filter *filter,
struct http_msg *msg)
{
struct cache_st *st = filter->ctx;
struct cache_flt_conf *cconf = FLT_CONF(filter);
struct cache *cache = cconf->c.cache;
struct shared_context *shctx = shctx_ptr(cache);
struct cache_entry *object;
if (!(msg->chn->flags & CF_ISRESP))
return 1;
if (st && st->first_block) {
object = (struct cache_entry *)st->first_block->data;
shctx_wrlock(shctx);
/* The whole payload was cached, the entry can now be used. */
object->complete = 1;
/* remove from the hotlist */
shctx_row_reattach(shctx, st->first_block);
shctx_wrunlock(shctx);
}
if (st) {
pool_free(pool_head_cache_st, st);
filter->ctx = NULL;
}
return 1;
}
/*
* This intends to be used when checking HTTP headers for some
* word=value directive. Return a pointer to the first character of value, if
* the word was not found or if there wasn't any value assigned to it return NULL
*/
char *directive_value(const char *sample, int slen, const char *word, int wlen)
{
int st = 0;
if (slen < wlen)
return 0;
while (wlen) {
char c = *sample ^ *word;
if (c && c != ('A' ^ 'a'))
return NULL;
sample++;
word++;
slen--;
wlen--;
}
while (slen) {
if (st == 0) {
if (*sample != '=')
return NULL;
sample++;
slen--;
st = 1;
continue;
} else {
return (char *)sample;
}
}
return NULL;
}
/*
* Return the maxage in seconds of an HTTP response.
* The returned value will always take the cache's configuration into account
* (cache->maxage) but the actual max age of the response will be set in the
* true_maxage parameter. It will be used to determine if a response is already
* stale or not.
* Compute the maxage using either:
* - the assigned max-age of the cache
* - the s-maxage directive
* - the max-age directive
* - (Expires - Data) headers
* - the default-max-age of the cache
*
*/
int http_calc_maxage(struct stream *s, struct cache *cache, int *true_maxage)
{
struct htx *htx = htxbuf(&s->res.buf);
struct http_hdr_ctx ctx = { .blk = NULL };
long smaxage = -1;
long maxage = -1;
int expires = -1;
struct tm tm = {};
time_t expires_val = 0;
char *endptr = NULL;
int offset = 0;
/* The Cache-Control max-age and s-maxage directives should be followed by
* a positive numerical value (see RFC 7234#5.2.1.1). According to the
* specs, a sender "should not" generate a quoted-string value but we will
* still accept this format since it isn't strictly forbidden. */
while (http_find_header(htx, ist("cache-control"), &ctx, 0)) {
char *value;
value = directive_value(ctx.value.ptr, ctx.value.len, "s-maxage", 8);
if (value) {
struct buffer *chk = get_trash_chunk();
chunk_memcat(chk, value, ctx.value.len - 8 + 1);
chunk_memcat(chk, "", 1);
offset = (*chk->area == '"') ? 1 : 0;
smaxage = strtol(chk->area + offset, &endptr, 10);
if (unlikely(smaxage < 0 || endptr == chk->area + offset))
return -1;
}
value = directive_value(ctx.value.ptr, ctx.value.len, "max-age", 7);
if (value) {
struct buffer *chk = get_trash_chunk();
chunk_memcat(chk, value, ctx.value.len - 7 + 1);
chunk_memcat(chk, "", 1);
offset = (*chk->area == '"') ? 1 : 0;
maxage = strtol(chk->area + offset, &endptr, 10);
if (unlikely(maxage < 0 || endptr == chk->area + offset))
return -1;
}
}
/* Look for Expires header if no s-maxage or max-age Cache-Control data
* was found. */
if (maxage == -1 && smaxage == -1) {
ctx.blk = NULL;
if (http_find_header(htx, ist("expires"), &ctx, 1)) {
if (parse_http_date(istptr(ctx.value), istlen(ctx.value), &tm)) {
expires_val = my_timegm(&tm);
/* A request having an expiring date earlier
* than the current date should be considered as
* stale. */
expires = (expires_val >= date.tv_sec) ?
(expires_val - date.tv_sec) : 0;
}
else {
/* Following RFC 7234#5.3, an invalid date
* format must be treated as a date in the past
* so the cache entry must be seen as already
* expired. */
expires = 0;
}
}
}
if (smaxage > 0) {
if (true_maxage)
*true_maxage = smaxage;
return MIN(smaxage, cache->maxage);
}
if (maxage > 0) {
if (true_maxage)
*true_maxage = maxage;
return MIN(maxage, cache->maxage);