After looking into the code that is used for proxying the dns requests to the
recursor server, I was wondering what happens when the responses are larger
than 1500 bytes? Wouldn't this potentially cause issues when large data sets
are passed back (DNSSEC data, etc.)?
void DNSProxy::mainloop(void)
{
try {
char buffer[1500]; <--Buffer to small for large
datasets
int len;
for(;;) {
len=recv(d_sock, buffer, sizeof(buffer),0); // answer from our backend
if(len<12) {
if(len<0)
L<<Logger::Error<<"Error receiving packet from recursor backend:
"<<stringerror()<<endl;
else if(len==0)
L<<Logger::Error<<"Error receiving packet from recursor backend,
EOF"<<endl;
else
L<<Logger::Error<<"Short packet from recursor backend, "<<len<<"
bytes"<<endl;
continue;
}
(*d_resanswers)++;
(*d_udpanswers)++;
Also, digging into the class DNSPacket which is used later on to store the
data that has been sent back, there appears to be a limit of 1680 bytes. (line
442 in DNSpacket.cc)
Steve
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