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Reintroduce redirect limit

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svn path=/trunk/netsurf/; revision=10350
This commit is contained in:
John Mark Bell 2010-04-11 13:58:12 +00:00
parent 3470764041
commit 758190f37b
1 changed files with 59 additions and 27 deletions
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86
content/llcache.c
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@ -80,6 +80,8 @@ typedef struct {
struct fetch *fetch; /**< Fetch handle for this object */
llcache_fetch_state state; /**< Current state of object fetch */
uint32_t redirect_count; /** Count of redirects followed */
} llcache_fetch_ctx;
/** Cache control data */
@ -146,16 +148,18 @@ static nserror llcache_object_user_destroy(llcache_object_user *user);
static nserror llcache_object_retrieve(const char *url, uint32_t flags,
const char *referer, const llcache_post_data *post,
llcache_object **result);
uint32_t redirect_count, llcache_object **result);
static nserror llcache_object_retrieve_from_cache(const char *url,
uint32_t flags, const char *referer,
const llcache_post_data *post, llcache_object **result);
const llcache_post_data *post, uint32_t redirect_count,
llcache_object **result);
static bool llcache_object_is_fresh(const llcache_object *object);
static nserror llcache_object_cache_update(llcache_object *object);
static nserror llcache_object_clone_cache_data(const llcache_object *source,
llcache_object *destination, bool deep);
static nserror llcache_object_fetch(llcache_object *object, uint32_t flags,
const char *referer, const llcache_post_data *post);
const char *referer, const llcache_post_data *post,
uint32_t redirect_count);
static nserror llcache_object_refetch(llcache_object *object);
static nserror llcache_object_new(const char *url, llcache_object **result);
@ -262,7 +266,7 @@ nserror llcache_handle_retrieve(const char *url, uint32_t flags,
/* Retrieve a suitable object from the cache,
* creating a new one if needed. */
error = llcache_object_retrieve(url, flags, referer, post, &object);
error = llcache_object_retrieve(url, flags, referer, post, 0, &object);
if (error != NSERROR_OK) {
llcache_object_user_destroy(user);
return error;
@ -486,16 +490,17 @@ nserror llcache_object_user_destroy(llcache_object_user *user)
/**
* Retrieve an object from the cache, fetching it if necessary.
*
* \param url URL of object to retrieve
* \param flags Fetch flags
* \param referer Referring URL, or NULL if none
* \param post POST data, or NULL for a GET request
* \param result Pointer to location to recieve retrieved object
* \param url URL of object to retrieve
* \param flags Fetch flags
* \param referer Referring URL, or NULL if none
* \param post POST data, or NULL for a GET request
* \param redirect_count Number of redirects followed so far
* \param result Pointer to location to recieve retrieved object
* \return NSERROR_OK on success, appropriate error otherwise
*/
nserror llcache_object_retrieve(const char *url, uint32_t flags,
const char *referer, const llcache_post_data *post,
llcache_object **result)
uint32_t redirect_count, llcache_object **result)
{
nserror error;
llcache_object *obj;
@ -530,7 +535,8 @@ nserror llcache_object_retrieve(const char *url, uint32_t flags,
return error;
/* Attempt to kick-off fetch */
error = llcache_object_fetch(obj, flags, referer, post);
error = llcache_object_fetch(obj, flags, referer, post,
redirect_count);
if (error != NSERROR_OK) {
llcache_object_destroy(obj);
return error;
@ -540,7 +546,7 @@ nserror llcache_object_retrieve(const char *url, uint32_t flags,
llcache_object_add_to_list(obj, &llcache_uncached_objects);
} else {
error = llcache_object_retrieve_from_cache(url, flags, referer,
post, &obj);
post, redirect_count, &obj);
if (error != NSERROR_OK)
return error;
@ -561,16 +567,17 @@ nserror llcache_object_retrieve(const char *url, uint32_t flags,
/**
* Retrieve a potentially cached object
*
* \param url URL of object to retrieve
* \param flags Fetch flags
* \param referer Referring URL, or NULL if none
* \param post POST data, or NULL for a GET request
* \param result Pointer to location to recieve retrieved object
* \param url URL of object to retrieve
* \param flags Fetch flags
* \param referer Referring URL, or NULL if none
* \param post POST data, or NULL for a GET request
* \param redirect_count Number of redirects followed so far
* \param result Pointer to location to recieve retrieved object
* \return NSERROR_OK on success, appropriate error otherwise
*/
nserror llcache_object_retrieve_from_cache(const char *url, uint32_t flags,
const char *referer, const llcache_post_data *post,
llcache_object **result)
uint32_t redirect_count, llcache_object **result)
{
nserror error;
llcache_object *obj, *newest = NULL;
@ -621,7 +628,8 @@ nserror llcache_object_retrieve_from_cache(const char *url, uint32_t flags,
obj->candidate = newest;
/* Attempt to kick-off fetch */
error = llcache_object_fetch(obj, flags, referer, post);
error = llcache_object_fetch(obj, flags, referer, post,
redirect_count);
if (error != NSERROR_OK) {
newest->candidate_count--;
llcache_object_destroy(obj);
@ -642,7 +650,8 @@ nserror llcache_object_retrieve_from_cache(const char *url, uint32_t flags,
#endif
/* Attempt to kick-off fetch */
error = llcache_object_fetch(obj, flags, referer, post);
error = llcache_object_fetch(obj, flags, referer, post,
redirect_count);
if (error != NSERROR_OK) {
llcache_object_destroy(obj);
return error;
@ -765,10 +774,11 @@ nserror llcache_object_clone_cache_data(const llcache_object *source,
/**
* Kick-off a fetch for an object
*
* \param object Object to fetch
* \param flags Fetch flags
* \param referer Referring URL, or NULL for none
* \param post POST data, or NULL for GET
* \param object Object to fetch
* \param flags Fetch flags
* \param referer Referring URL, or NULL for none
* \param post POST data, or NULL for GET
* \param redirect_count Number of redirects followed so far
* \return NSERROR_OK on success, appropriate error otherwise
*
* \pre object::url must contain the URL to fetch
@ -777,7 +787,8 @@ nserror llcache_object_clone_cache_data(const llcache_object *source,
* \pre There must not be a fetch in progress for \a object
*/
nserror llcache_object_fetch(llcache_object *object, uint32_t flags,
const char *referer, const llcache_post_data *post)
const char *referer, const llcache_post_data *post,
uint32_t redirect_count)
{
nserror error;
char *referer_clone = NULL;
@ -804,6 +815,7 @@ nserror llcache_object_fetch(llcache_object *object, uint32_t flags,
object->fetch.flags = flags;
object->fetch.referer = referer_clone;
object->fetch.post = post_clone;
object->fetch.redirect_count = redirect_count;
return llcache_object_refetch(object);
}
@ -1591,7 +1603,26 @@ nserror llcache_fetch_redirect(llcache_object *object, const char *target,
/* And mark it complete */
object->fetch.state = LLCACHE_FETCH_COMPLETE;
/** \todo Limit redirect depth, or detect cycles */
/* Forcibly stop redirecting if we've followed too many redirects */
#define REDIRECT_LIMIT 10
if (object->fetch.redirect_count > REDIRECT_LIMIT) {
llcache_event event;
LOG(("Too many nested redirects"));
event.type = LLCACHE_EVENT_ERROR;
event.data.msg = messages_get("BadRedirect");
for (user = object->users; user != NULL; user = user->next) {
error = user->handle.cb(&user->handle, &event,
user->handle.pw);
if (error != NSERROR_OK)
break;
}
return NSERROR_OK;
}
#undef REDIRECT_LIMIT
/* Make target absolute */
result = url_join(target, object->url, &absurl);
@ -1625,7 +1656,8 @@ nserror llcache_fetch_redirect(llcache_object *object, const char *target,
/* Attempt to fetch target URL */
error = llcache_object_retrieve(url, object->fetch.flags,
object->fetch.referer, post, &dest);
object->fetch.referer, post,
object->fetch.redirect_count + 1, &dest);
/* No longer require url */
free(url);