I realize this is beyond the scope of your project, so I hope it's not inappropriate for me to post this here. There really aren't any resources out there about this, but I was hoping that since we have similar interests someone involved in this project might have some insight for me.
I'm working on a NATNEG emulator for PC games and have run into a situation where the guest only sends one NN_INIT packet to NATNEG1, sequence NN_PT_NN1. This appears to come from a temporary port, not the public port of the guest.
The HOST sends two NN_INIT packets to NATNEG1, sequence NN_PT_GP and NN_PT_NN1. (this is initiated by my server browser server sending a NATNEG SEND_MESSAGE_REQUEST to the hosts public ip:port with the cookie of the NATNEG session)
My server sends back the NN_INIT_ACK packet to each received packet. Once guest NN_PT_NN1, host NN_PT_GP and NN_PT_NN1 have been received, my server sends an NN_CONNECT packet to both the guest and host.
I receive a NN_CONNECT_ACK back from the host, but not the guest. The host then continuously sends a NN_CONNECT_PING packet to the guest (ip:port from recvfrom on the guest NN_INIT packet), and the guest never replies. Obviously, the connection is never successfully because of this.
My question is, since I never receive a NN_INIT packet, sequence NN_PT_GP from the guest, how do I know what the guest's public port is? I believe I need the public port to send to the host in the NN_CONNECT packet.
Reviewing the Gamespy SDK source, it would appear the guest will never send NN_INIT, sequence NN_PT_GP and that it will never acknowledge NN_CONNECT_ACK either. It appears this is working as designed, however the guest never connects to the host because I'm missing some piece of the NATNEG negotiation.
I can provide packet dumps if it would be helpful. The game in question is ToCA Race Driver 3.
I'm working on a NATNEG emulator for PC games and have run into a situation where the guest only sends one NN_INIT packet to NATNEG1, sequence NN_PT_NN1. This appears to come from a temporary port, not the public port of the guest.
The HOST sends two NN_INIT packets to NATNEG1, sequence NN_PT_GP and NN_PT_NN1. (this is initiated by my server browser server sending a NATNEG SEND_MESSAGE_REQUEST to the hosts public ip:port with the cookie of the NATNEG session)
My server sends back the NN_INIT_ACK packet to each received packet. Once guest NN_PT_NN1, host NN_PT_GP and NN_PT_NN1 have been received, my server sends an NN_CONNECT packet to both the guest and host.
I receive a NN_CONNECT_ACK back from the host, but not the guest. The host then continuously sends a NN_CONNECT_PING packet to the guest (ip:port from recvfrom on the guest NN_INIT packet), and the guest never replies. Obviously, the connection is never successfully because of this.
My question is, since I never receive a NN_INIT packet, sequence NN_PT_GP from the guest, how do I know what the guest's public port is? I believe I need the public port to send to the host in the NN_CONNECT packet.
Reviewing the Gamespy SDK source, it would appear the guest will never send NN_INIT, sequence NN_PT_GP and that it will never acknowledge NN_CONNECT_ACK either. It appears this is working as designed, however the guest never connects to the host because I'm missing some piece of the NATNEG negotiation.
I can provide packet dumps if it would be helpful. The game in question is ToCA Race Driver 3.
