static void pico_dns_client_retransmission(unsigned long now, void *arg)
{
struct pico_dns_key *key = (struct pico_dns_key *)arg;
struct pico_dns_ns *q_ns = NULL;
if (!key->retrans) {
dns_dbg("DNS: no retransmission!\n");
pico_free(key->q_hdr);
if(pico_tree_delete(&DNSTable,key))
pico_free(key);
}
else if (key->retrans <= PICO_DNS_CLIENT_MAX_RETRANS) {
key->retrans++;
dns_dbg("DNS: retransmission! (%u attempts)\n", key->retrans);
// ugly hack
q_ns = pico_tree_next(pico_tree_findNode(&NSTable,&key->q_ns))->keyValue;
if (q_ns)
key->q_ns = *q_ns;
else
key->q_ns = *((struct pico_dns_ns *)pico_tree_first(&NSTable));
pico_dns_client_send(key);
pico_timer_add(PICO_DNS_CLIENT_RETRANS, pico_dns_client_retransmission, key);
} else {
dns_dbg("DNS ERROR: no reply from nameservers! (%u attempts)\n", key->retrans);
pico_socket_close(key->s);
pico_err = PICO_ERR_EIO;
key->callback(NULL, key->arg);
pico_free(key->q_hdr);
/* RB_REMOVE returns pointer to removed element, NULL to indicate error */
if(pico_tree_delete(&DNSTable,key))
pico_free(key);
}
}
static struct pico_dns_ns pico_dns_client_next_ns(struct pico_ip4 *ns_addr)
{
struct pico_dns_ns dns = {{0}}, *nxtdns = NULL;
struct pico_tree_node *node = NULL, *nxtnode = NULL;
dns.ns = *ns_addr;
node = pico_tree_findNode(&NSTable, &dns);
if (!node)
return dns; /* keep using current NS */
nxtnode = pico_tree_next(node);
nxtdns = nxtnode->keyValue;
if (!nxtdns)
nxtdns = (struct pico_dns_ns *)pico_tree_first(&NSTable);
return *nxtdns;
}
