/* function: dns64_detection
* does dns lookups to set the plat subnet or exits on failure, waits forever for a dns response with a query backoff timer
*/
void dns64_detection() {
int backoff_sleep, status;
struct in6_addr tmp_ptr;
backoff_sleep = 1;
while(1) {
status = plat_prefix(Global_Clatd_Config.plat_from_dns64_hostname,&tmp_ptr);
if(status > 0) {
memcpy(&Global_Clatd_Config.plat_subnet, &tmp_ptr, sizeof(struct in6_addr));
return;
}
if(status < 0) {
logmsg(ANDROID_LOG_FATAL, "dns64_detection/no dns64, giving up\n");
exit(1);
}
logmsg(ANDROID_LOG_WARN, "dns64_detection failed, sleeping for %d seconds", backoff_sleep);
sleep(backoff_sleep);
if(backoff_sleep >= 120) {
backoff_sleep = 120;
} else {
backoff_sleep *= 2;
}
}
}
/* function: dns64_detection
* does dns lookups to set the plat subnet or exits on failure, waits forever for a dns response with a query backoff timer
* net_id - (optional) netId to use, NETID_UNSET indicates use of default network
*/
void dns64_detection(unsigned net_id) {
int backoff_sleep, status;
struct in6_addr tmp_ptr;
backoff_sleep = 1;
while(1) {
status = plat_prefix(Global_Clatd_Config.plat_from_dns64_hostname,net_id,&tmp_ptr);
if(status > 0) {
memcpy(&Global_Clatd_Config.plat_subnet, &tmp_ptr, sizeof(struct in6_addr));
return;
}
logmsg(ANDROID_LOG_WARN, "dns64_detection -- error, sleeping for %d seconds", backoff_sleep);
sleep(backoff_sleep);
backoff_sleep *= 2;
if(backoff_sleep >= 120) {
backoff_sleep = 120;
}
}
}
