tun2socks

Accepts all incoming TCP connections , and forwards the connections through a SOCKS server

structure

                                              +---------------+
                                         +--->|  tcp_conn_cb  |---+
                                         |    +---------------+   |
+----------------+ -----> +-----------+  |    +---------------+   |   +-----------------+ -----> +---------------+
|ip packet frames|        |tcp segment+--+--->|  tcp_read_cb  |---+->>| virtual program |        |  socks proxy  |
+----------------+ <----- +-----------+       +---------------+   +---+-----------------+ <----- +---------------+
                                ^             +---------------+   |
                                +-------------|   tcp_write   |<--+
                                              +---------------+

tips

ip layer

this layer has to reassemble the datagram and pass it to the higher protocol layer.

tcp layer

if ip packet frames come from host apps, and because of it not recv or send data by network, so it don't need set timeout and retransmission