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pending-server: retry for 2 minutes when add pending server.

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This commit is contained in:
Nick Peng
2020-04-17 22:37:49 +08:00
parent c2c418ed89
commit 3985ea8269
1 changed files with 22 additions and 5 deletions
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27
src/dns_client.c
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@@ -59,6 +59,7 @@
#define DNS_TCP_CONNECT_TIMEOUT (5)
#define DNS_QUERY_TIMEOUT (500)
#define DNS_QUERY_RETRY (3)
#define DNS_PENDING_SERVER_RETRY 40
#define SOCKET_PRIORITY (6)
#define SOCKET_IP_TOS (IPTOS_LOWDELAY | IPTOS_RELIABILITY)
@@ -147,6 +148,7 @@ struct dns_server_pending {
unsigned int query_v6;
/* server type */
dns_server_type_t type;
int retry_cnt;
int port;
@@ -2681,16 +2683,16 @@ static int _dns_client_pending_server_resolve(char *domain, dns_rtcode_t rtcode,
int ret = 0;
if (addr_type == DNS_T_A) {
pending->has_v4 = 1;
pending->ping_time_v4 = -1;
if (rtcode == DNS_RC_NOERROR) {
pending->has_v4 = 1;
pending->ping_time_v4 = ping_time;
safe_strncpy(pending->ipv4, ip, DNS_HOSTNAME_LEN);
}
} else if (addr_type == DNS_T_AAAA) {
pending->has_v6 = 1;
pending->ping_time_v6 = -1;
if (rtcode == DNS_RC_NOERROR) {
pending->has_v6 = 1;
pending->ping_time_v6 = ping_time;
safe_strncpy(pending->ipv6, ip, DNS_HOSTNAME_LEN);
}
@@ -2732,11 +2734,14 @@ static void _dns_client_add_pending_servers(void)
if (++dely < 3) {
return;
}
dely = 0;
pthread_mutex_lock(&pending_server_mutex);
list_for_each_entry_safe(pending, tmp, &pending_servers, list)
{
/* send dns type A, AAAA query to bootstrap DNS server */
int add_success = 0;
if (pending->query_v4 == 0) {
pending->query_v4 = 1;
_dns_client_server_pending_get(pending);
@@ -2748,7 +2753,9 @@ static void _dns_client_add_pending_servers(void)
if (pending->query_v6 == 0) {
pending->query_v6 = 1;
_dns_client_server_pending_get(pending);
dns_server_query(pending->host, DNS_T_AAAA, _dns_client_pending_server_resolve, pending);
if (dns_server_query(pending->host, DNS_T_AAAA, _dns_client_pending_server_resolve, pending) != 0) {
_dns_client_server_pending_release_lck(pending);
}
}
/* if both A, AAAA has query result, select fastest IP address */
@@ -2761,12 +2768,22 @@ static void _dns_client_add_pending_servers(void)
}
if (ip[0]) {
if (_dns_client_add_pendings(pending, ip) != 0) {
tlog(TLOG_WARN, "add pending DNS server %s failed.", pending->host);
if (_dns_client_add_pendings(pending, ip) == 0) {
add_success = 1;
}
}
}
pending->retry_cnt++;
if (pending->retry_cnt >= DNS_PENDING_SERVER_RETRY || add_success) {
if (add_success == 0) {
tlog(TLOG_WARN, "add pending DNS server %s failed.", pending->host);
}
_dns_client_server_pending_release_lck(pending);
} else {
tlog(TLOG_DEBUG, "add pending DNS server %s failed, retry %d...", pending->host, pending->retry_cnt);
pending->query_v4 = 0;
pending->query_v6 = 0;
}
/* if has no bootstrap DNS, just call getaddrinfo to get address */