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#include "detection/dns/dns.h"
#include "common/netif.h"
#include "common/mallocHelper.h"
#include <ws2tcpip.h>
#include <iphlpapi.h>
const char* ffDetectDNS(FFDNSOptions* options, FFlist* results) {
IP_ADAPTER_ADDRESSES* FF_AUTO_FREE adapter_addresses = NULL;
// Multiple attempts in case interfaces change while
// we are in the middle of querying them.
DWORD adapter_addresses_buffer_size = 0;
for (int attempts = 0;; ++attempts) {
if (adapter_addresses_buffer_size) {
adapter_addresses = (IP_ADAPTER_ADDRESSES*) realloc(adapter_addresses, adapter_addresses_buffer_size);
assert(adapter_addresses);
}
DWORD error = GetAdaptersAddresses(
options->showType & FF_DNS_TYPE_IPV4_BIT
? options->showType & FF_DNS_TYPE_IPV6_BIT ? AF_UNSPEC : AF_INET
: AF_INET6,
GAA_FLAG_SKIP_UNICAST | GAA_FLAG_SKIP_ANYCAST | GAA_FLAG_SKIP_MULTICAST | GAA_FLAG_SKIP_FRIENDLY_NAME,
NULL,
adapter_addresses,
&adapter_addresses_buffer_size);
if (error == ERROR_SUCCESS) {
break;
} else if (ERROR_BUFFER_OVERFLOW == error && attempts < 4) {
continue;
} else {
return "GetAdaptersAddresses() failed";
}
}
uint32_t defaultRouteIfIndex = ffNetifGetDefaultRouteV4()->ifIndex;
// Iterate through all of the adapters
for (IP_ADAPTER_ADDRESSES* adapter = adapter_addresses; adapter; adapter = adapter->Next) {
if (adapter->IfIndex != defaultRouteIfIndex) {
continue;
}
if (adapter->OperStatus != IfOperStatusUp) {
continue;
}
for (IP_ADAPTER_DNS_SERVER_ADDRESS_XP* ifa = adapter->FirstDnsServerAddress; ifa; ifa = ifa->Next) {
FFstrbuf* item = FF_LIST_ADD(FFstrbuf, *results);
if (ifa->Address.lpSockaddr->sa_family == AF_INET) {
SOCKADDR_IN* ipv4 = (SOCKADDR_IN*) ifa->Address.lpSockaddr;
ffStrbufInitA(item, INET_ADDRSTRLEN);
item->length = (uint32_t) (RtlIpv4AddressToStringA(&ipv4->sin_addr, item->chars) - item->chars);
} else if (ifa->Address.lpSockaddr->sa_family == AF_INET6) {
SOCKADDR_IN6* ipv6 = (SOCKADDR_IN6*) ifa->Address.lpSockaddr;
ffStrbufInitA(item, INET6_ADDRSTRLEN);
item->length = (uint32_t) (RtlIpv6AddressToStringA(&ipv6->sin6_addr, item->chars) - item->chars);
}
}
break;
}
return NULL;
}
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