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Reuse DNS query ID for retransmissions

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This commit is contained in:
dmiller
2024-05-13 14:31:33 +00:00
parent 5c46b3b9f7
commit e1a2577ffd
2 changed files with 10 additions and 9 deletions
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15
nmap_dns.cc
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@@ -493,7 +493,6 @@ static void put_dns_packet_on_wire(request *req) {
struct timeval now, timeout;
req->id = DNS::Factory::progressiveId;
req->curr_server->write_busy = 1;
req->curr_server->reqs_on_wire++;
DNS::Request &reqt = *req->targ;
@@ -502,11 +501,11 @@ static void put_dns_packet_on_wire(request *req) {
case DNS::ANY:
case DNS::A:
case DNS::AAAA:
plen = DNS::Factory::buildSimpleRequest(reqt.name, wire_type(reqt.type), packet, maxlen);
plen = DNS::Factory::buildSimpleRequest(req->id, reqt.name, wire_type(reqt.type), packet, maxlen);
break;
case DNS::PTR:
assert(reqt.ssv.size() > 0);
plen = DNS::Factory::buildReverseRequest(reqt.ssv.front(), packet, maxlen);
plen = DNS::Factory::buildReverseRequest(req->id, reqt.ssv.front(), packet, maxlen);
break;
default:
break;
@@ -1185,6 +1184,7 @@ static void nmap_mass_dns_core(DNS::Request *requests, int num_requests) {
tpreq->tries = 0;
tpreq->servers_tried = 0;
tpreq->alt_req = false;
tpreq->id = DNS::Factory::progressiveId++;
new_reqs.push_back(tpreq);
total_reqs++;
@@ -1198,6 +1198,7 @@ static void nmap_mass_dns_core(DNS::Request *requests, int num_requests) {
*tpreq_alt = *tpreq;
tpreq_alt->targ = req_aaaa;
tpreq_alt->alt_req = true;
tpreq_alt->id = DNS::Factory::progressiveId++;
new_reqs.push_back(tpreq_alt);
total_reqs++;
}
@@ -1513,10 +1514,10 @@ bool DNS::Factory::ptrToIp(const std::string &ptr, sockaddr_storage &ip)
return true;
}
size_t DNS::Factory::buildSimpleRequest(const std::string &name, RECORD_TYPE rt, u8 *buf, size_t maxlen)
size_t DNS::Factory::buildSimpleRequest(u16 id, const std::string &name, RECORD_TYPE rt, u8 *buf, size_t maxlen)
{
size_t ret=0 , tmp=0;
DNS_CHECK_ACCUMLATE(ret, tmp, putUnsignedShort(progressiveId++, buf, ID, maxlen)); // Postincrement inmportant here
DNS_CHECK_ACCUMLATE(ret, tmp, putUnsignedShort(id, buf, ID, maxlen));
DNS_CHECK_ACCUMLATE(ret, tmp, putUnsignedShort(OP_STANDARD_QUERY | RECURSION_DESIRED, buf, FLAGS_OFFSET, maxlen));
DNS_CHECK_ACCUMLATE(ret, tmp, putUnsignedShort(1, buf, QDCOUNT, maxlen));
DNS_CHECK_ACCUMLATE(ret, tmp, putUnsignedShort(0, buf, ANCOUNT, maxlen));
@@ -1529,11 +1530,11 @@ size_t DNS::Factory::buildSimpleRequest(const std::string &name, RECORD_TYPE rt,
return ret;
}
size_t DNS::Factory::buildReverseRequest(const sockaddr_storage &ip, u8 *buf, size_t maxlen)
size_t DNS::Factory::buildReverseRequest(u16 id, const sockaddr_storage &ip, u8 *buf, size_t maxlen)
{
std::string name;
if(ipToPtr(ip,name))
return buildSimpleRequest(name, PTR, buf, maxlen);
return buildSimpleRequest(id, name, PTR, buf, maxlen);
return 0;
}