DNS failure when trying to get ip of local host

[adamelhakham]

When running the following code:

EthernetInterface ifaceHandler;
char address[] = "prov-dev.kfn.arm.com";//" this is a local host, running in ARM network with IP 10.45.51.47"
uint16_t port = 5683;
SocketAddress *addr;
const char *ipGet;

ifaceHandler.connect();

addr = new SocketAddress(&ifaceHandler, address, port);

ipGet = addr->get_ip_address();

printf("ip is: %s\n", ipGet);

the message "ip is: 0.0.0.0" is printed instead of "ip is: 10.45.51.47".
I tried digging a bit deeper and found that in the following function (in DnsQuery.cpp):
static int32_t query(UDPSocket *socket, const SocketAddress &addr, const char *hostname, char *ipaddress)

it receives an answer from the DNS but failes to resolve the packet and runs the following code:

if (!resolve(packet, ipaddress)) {
delete packet;
return NSAPI_ERROR_DNS_FAILURE;
}

• note that on public hosts everything works correctly.

@jenia81

[bridadan]

cc @sarahmarshy @geky

[geky]

Hi @adamelhakham, thanks for reporting this. This would be caused by not using DNS servers supplied by DHCP acknowledgement. This required a bit of tweaking internal to the network-socket API. I should be able to have a fix up soon.

[ciarmcom]

ARM Internal Ref: IOTMORF-448

[sg-]

Should be fixed with #2497