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invalid dns cache entry after ttl expires

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Log ttl after receive dns query and invalid dns cache entry when ttl expires.

Signed-off-by: liangchaozhong <liangchaozhong@xiaomi.com>
This commit is contained in:
liangchaozhong
2022-11-14 17:13:32 +08:00
committed by archer
parent cd3d3c272a
commit d8777fa77d
3 changed files with 20 additions and 7 deletions
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libs/libc/netdb/lib_dnscache.c
+7 -2
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@@ -53,6 +53,7 @@ struct dns_cache_s
char name[CONFIG_NETDB_DNSCLIENT_NAMESIZE];
uint8_t naddr; /* How many addresses per name */
union dns_addr_u addr[CONFIG_NETDB_MAX_IPADDR];
uint32_t ttl;
};
/****************************************************************************
@@ -84,6 +85,7 @@ static struct dns_cache_s g_dns_cache[CONFIG_NETDB_DNSCLIENT_ENTRIES];
* hostname - The hostname string to be cached.
* addr - The IP addresses associated with the hostname.
* naddr - The count of the IP addresses.
* ttl - The TTL of the IP addresses.
*
* Returned Value:
* None
@@ -91,7 +93,8 @@ static struct dns_cache_s g_dns_cache[CONFIG_NETDB_DNSCLIENT_ENTRIES];
****************************************************************************/
void dns_save_answer(FAR const char *hostname,
FAR const union dns_addr_u *addr, int naddr)
FAR const union dns_addr_u *addr, int naddr,
uint32_t ttl)
{
FAR struct dns_cache_s *entry;
#if CONFIG_NETDB_DNSCLIENT_LIFESEC > 0
@@ -145,6 +148,7 @@ void dns_save_answer(FAR const char *hostname,
strlcpy(entry->name, hostname, CONFIG_NETDB_DNSCLIENT_NAMESIZE);
memcpy(&entry->addr, addr, naddr * sizeof(*addr));
entry->naddr = naddr;
entry->ttl = ttl;
/* Save the updated head index */
@@ -242,7 +246,8 @@ int dns_find_answer(FAR const char *hostname, FAR union dns_addr_u *addr,
*/
elapsed = (uint32_t)now.tv_sec - (uint32_t)entry->ctime;
if (ret >= 0 && elapsed > CONFIG_NETDB_DNSCLIENT_LIFESEC)
if (ret >= 0 &&
(elapsed > CONFIG_NETDB_DNSCLIENT_LIFESEC || elapsed > entry->ttl))
{
/* This entry has expired. Increment the tail index to exclude
* this entry on future traversals.