diff options
Diffstat (limited to 'src/resolve/resolved-dns-server.c')
| -rw-r--r-- | src/resolve/resolved-dns-server.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-server.c b/src/resolve/resolved-dns-server.c index 92e48ae442..2ff5b192df 100644 --- a/src/resolve/resolved-dns-server.c +++ b/src/resolve/resolved-dns-server.c @@ -23,6 +23,10 @@ #include "resolved-dns-server.h" +/* After how much time to repeat classic DNS requests */ +#define DNS_TIMEOUT_MIN_USEC (500 * USEC_PER_MSEC) +#define DNS_TIMEOUT_MAX_USEC (5 * USEC_PER_SEC) + int dns_server_new( Manager *m, DnsServer **ret, @@ -45,6 +49,7 @@ int dns_server_new( s->type = type; s->family = family; s->address = *in_addr; + s->resend_timeout = DNS_TIMEOUT_MIN_USEC; if (type == DNS_SERVER_LINK) { LIST_FIND_TAIL(servers, l->dns_servers, tail); @@ -115,6 +120,23 @@ DnsServer* dns_server_unref(DnsServer *s) { return NULL; } +void dns_server_packet_received(DnsServer *s, usec_t rtt) { + assert(s); + + if (rtt > s->max_rtt) { + s->max_rtt = rtt; + s->resend_timeout = MIN(MAX(DNS_TIMEOUT_MIN_USEC, s->max_rtt * 2), + DNS_TIMEOUT_MAX_USEC); + } +} + +void dns_server_packet_lost(DnsServer *s, usec_t usec) { + assert(s); + + if (s->resend_timeout <= usec) + s->resend_timeout = MIN(s->resend_timeout * 2, DNS_TIMEOUT_MAX_USEC); +} + static unsigned long dns_server_hash_func(const void *p, const uint8_t hash_key[HASH_KEY_SIZE]) { const DnsServer *s = p; uint64_t u; |