Data interaction method, apparatus, and system

A data interaction method, comprising:

• receiving, by a relay device, an address detection request sent by a local client host;
• collecting, by the relay device, according to a packet type of the address detection request, two types of addresses corresponding to the packet type, wherein the two types of addresses comprise a mapping address allocated by a network address translation NAT host at an outermost layer and a relay address of the relay device which serves as a local relay device;
• and
• sending, by the relay device, to the local client host, the collected two types of addresses corresponding to the packet type, so that the local client host and a peer client host perform address exchange and address matching, so that the local client host perform, based on matched addresses, channel connectivity detection and select a channel with a highest priority from channels on which connectivity detection is successful for data interaction with the peer client host;
• wherein the method further comprises:
• receiving, by the relay device, data in a UDP format sent by a peer relay device;
• determining, by the relay device, a channel with a highest priority between the local relay device and the local client host;
• when the channel with the highest priority between the local relay device and the local client host is a non-UDP channel, converting, by the relay device, the data from the UDP format to a format corresponding to the channel with the highest priority;
• and
• sending, by the relay device, data in a converted format to the local client host.

A client host, comprising:

• a memory that stores instructions;
• and
• a processor coupled to the memory and configured to execute the instructions to:
• send simultaneously an address detection request for a User Datagram Protocol (UDP) channel and an address detection request for a Transmission Control Protocol (TCP) channel,
• when both address detection for the UDP channel and address detection for the TCP channel fail, send an address detection request for a Hypertext Transfer Protocol HTTP channel,
• when address detection for at least one channel succeeds, collect two types of addresses corresponding to each channel in the at least one channel, wherein the two types of addresses comprise a mapping address allocated by a network address translation NAT host at an outermost layer and a relay address of a local relay device,
• perform address exchange and address matching on the collected addresses with a peer client host,
• perform channel connectivity detection based on matched addresses, and select a channel with a highest priority from channels on which connectivity detection is successful for data interaction with the peer client host,
• obtain host addresses of three types of channels of the client host which serves as a local client host, wherein the host addresses of the three types of channels comprise a host address of the UDP channel, a host address of the TCP channel, and a host address of the HTTP channel;
• and
• exchange the host addresses of the three types of channels of the local client host and the collected two types of addresses, with host addresses of the three types of channels of the peer client host and the two types of addresses collected by the peer client host, and match the host addresses of the three types of channels of the local client host and the collected two types of addresses, with host addresses of the three types of channels of the peer client host and the two types of addresses collected by the peer client host.

A relay device, comprising:

• a memory that stores instructions;
• and
• a processor coupled to the memory and configured to execute the instructions to:
• receive an address detection request sent by a local client host,
• collect, according to a packet type of the address detection request, two types of addresses corresponding to the packet type, wherein the two types of addresses comprise a mapping address allocated by a network address translation NAT host at an outermost layer and a relay address of the relay device which serves as a local relay device;
• send, to the local client host, the two types of addresses which correspond to the packet type and are collected by the address collecting unit, so that the local client host and a peer client host perform address exchange and address matching, and the local client host perform, based on matched addresses, channel connectivity detection and select a channel with a highest priority from channels on which connectivity detection is successful for data interaction with the peer client host;
• receive data in a UDP format sent by a peer relay device;
• determine a channel with a highest priority between the local relay device and the local client host;
• when the channel with the highest priority between the local relay device and the local client host is a non-UDP channel, convert the data from the UDP format to a format corresponding to the channel with the highest priority;
• and
• send data in a converted format to the local client host.