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resolve: don't leak pre-populated dns entries 

CURLOPT_RESOLVE populates the DNS cache with entries that are marked as
eternally in use. Those entries need to be taken care of when the cache
is killed off.

Bug: http://curl.haxx.se/bug/view.cgi?id=3463121
Reported by: "tw84452852"
This commit is contained in:
Daniel Stenberg 2011-12-23 14:30:43 +01:00
parent 3e4181f88e
commit 2caa454dc1
3 changed files with 29 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
lib/hostip.c
View File

@ -721,4 +721,25 @@ struct curl_hash *Curl_mk_dnscache(void)
return Curl_hash_alloc(7, Curl_hash_str, Curl_str_key_compare, freednsentry);
}
static int hostcache_inuse(void *data, void *hc)
{
struct Curl_dns_entry *c = (struct Curl_dns_entry *) hc;
if(c->inuse == 1)
Curl_resolv_unlock(data, c);
return 1; /* free all entries */
}
void Curl_hostcache_destroy(struct SessionHandle *data)
{
/* Entries added to the hostcache with the CURLOPT_RESOLVE function are
* still present in the cache with the inuse counter set to 1. Detect them
* and cleanup!
*/
Curl_hash_clean_with_criterium(data->dns.hostcache, data, hostcache_inuse);
Curl_hash_destroy(data->dns.hostcache);
data->dns.hostcachetype = HCACHE_NONE;
data->dns.hostcache = NULL;
}

5
lib/hostip.h
View File

@ -200,4 +200,9 @@ extern sigjmp_buf curl_jmpenv;
*/
CURLcode Curl_set_dns_servers(struct SessionHandle *data, char *servers);
/*
* Destroy the hostcache of this handle.
*/
void Curl_hostcache_destroy(struct SessionHandle *data);
#endif /* HEADER_CURL_HOSTIP_H */

15
lib/url.c
View File

@ -467,11 +467,8 @@ CURLcode Curl_close(struct SessionHandle *data)
return CURLE_OK;
}
if(data->dns.hostcachetype == HCACHE_PRIVATE) {
Curl_hash_destroy(data->dns.hostcache);
data->dns.hostcachetype = HCACHE_NONE;
data->dns.hostcache = NULL;
}
if(data->dns.hostcachetype == HCACHE_PRIVATE)
Curl_hostcache_destroy(data);
if(data->state.rangestringalloc)
free(data->state.range);
@ -2131,7 +2128,7 @@ CURLcode Curl_setopt(struct SessionHandle *data, CURLoption option,
if(data->share->hostcache) {
/* use shared host cache, first free the private one if any */
if(data->dns.hostcachetype == HCACHE_PRIVATE)
Curl_hash_destroy(data->dns.hostcache);
Curl_hostcache_destroy(data);
data->dns.hostcache = data->share->hostcache;
data->dns.hostcachetype = HCACHE_SHARED;
@ -2626,12 +2623,6 @@ CURLcode Curl_disconnect(struct connectdata *conn, bool dead_connection)
conn->dns_entry = NULL;
}
#if defined(DEBUGBUILD) && defined(AGGRESIVE_TEST)
/* scan for DNS cache entries still marked as in use */
Curl_hash_apply(data->hostcache,
NULL, Curl_scan_cache_used);
#endif
Curl_hostcache_prune(data); /* kill old DNS cache entries */
{