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dns_server: support TCP keepalive timeout EDNS

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This commit is contained in:
Nick Peng
2023-11-16 23:16:37 +08:00
parent a482ceeb5a
commit 9a83df46e0
7 changed files with 161 additions and 70 deletions
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18
src/dns_cache.c
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@@ -32,6 +32,7 @@
#define DNS_CACHE_HITNUM_STEP 3
#define DNS_CACHE_HITNUM_STEP_MAX 6
#define DNS_CACHE_READ_TIMEOUT 60
#define EXPIRED_DOMAIN_PREFETCH_TIME (3600 * 8)
struct dns_cache_head {
struct hash_table cache_hash;
@@ -508,12 +509,25 @@ static int _dns_cache_read_to_cache(struct dns_cache_record *cache_record, struc
struct list_head *head = NULL;
head = &dns_cache_head.cache_list;
struct dns_cache_info *info = &cache_record->info;
int expired_time = 0;
time_t now = time(NULL);
if (now < info->replace_time) {
info->replace_time = now;
}
expired_time = dns_conf_serve_expired_prefetch_time;
if (expired_time == 0) {
expired_time = dns_conf_serve_expired_ttl / 2;
if (expired_time == 0 || expired_time > EXPIRED_DOMAIN_PREFETCH_TIME) {
expired_time = EXPIRED_DOMAIN_PREFETCH_TIME;
}
}
int passed_time = now - info->replace_time;
int timeout = info->timeout - passed_time;
if ((timeout > dns_conf_serve_expired_ttl + info->ttl) && dns_conf_serve_expired_ttl >= 0) {
timeout = dns_conf_serve_expired_ttl + info->ttl;
if ((timeout > expired_time + info->ttl) && expired_time >= 0) {
timeout = expired_time + info->ttl;
}
if (timeout < DNS_CACHE_READ_TIMEOUT * 2) {