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Do not print DNS warnings by default and drop duplicate requests.

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Windows is known to use all available interfaces for DNS requests,
which is handled as a duplicate (retransmission) in dns redirector.

It's safe to just drop these duplicates.
This commit is contained in:
ValdikSS
2017-12-16 14:16:01 +03:00
parent 30bb1a665a
commit dd4d6bc5c6
4 changed files with 37 additions and 9 deletions
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21
dnsredir.c
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@@ -23,9 +23,7 @@
#ifndef debug
#define debug(...) do {} while (0)
#endif
#ifndef debug
#else
#define debug(...) printf(...)
#endif
@@ -146,6 +144,18 @@ void dns_cleanup() {
}
}
int dns_is_dns_packet(const char *packet_data, const UINT packet_dataLen, const int outgoing) {
if (outgoing && (ntohs(*(const uint16_t*)(packet_data + 2)) & 0xFA00) == 0 &&
(ntohs(*(const uint32_t*)(packet_data + 6))) == 0) {
return TRUE;
}
else if (!outgoing &&
(ntohs(*(const uint16_t*)(packet_data + 2)) & 0xF800) == 0x8000) {
return TRUE;
}
return FALSE;
}
int dns_handle_outgoing(const uint32_t srcip, const uint16_t srcport,
const uint32_t dstip, const uint16_t dstport,
const char *packet_data, const UINT packet_dataLen) {
@@ -155,8 +165,7 @@ int dns_handle_outgoing(const uint32_t srcip, const uint16_t srcport,
dns_cleanup();
if ((ntohs(*(const uint16_t*)(packet_data + 2)) & 0xFA00) == 0 &&
(ntohs(*(const uint32_t*)(packet_data + 6))) == 0) {
if (dns_is_dns_packet(packet_data, packet_dataLen, 1)) {
/* Looks like DNS request */
debug("trying to add srcport = %hu, dstport = %hu\n", ntohs(srcport), ntohs(dstport));
return add_udp_conntrack(srcip, srcport, dstip, dstport);
@@ -178,7 +187,7 @@ int dns_handle_incoming(const uint32_t srcip, const uint16_t srcport,
dns_cleanup();
if ((ntohs(*(const uint16_t*)(packet_data + 2)) & 0xF800) == 0x8000) {
if (dns_is_dns_packet(packet_data, packet_dataLen, 0)) {
/* Looks like DNS response */
construct_key(srcip, srcport, key);
if (check_get_udp_conntrack_key(key, &tmp_connrecord) && tmp_connrecord) {