Socks server

Socks-DeleGate with SERVER=socks accepts both SocksV4 and SocksV5, whereas SERVER=socks4 and SERVER=socks5 accepts only SocksV4 and SocksV5 respectively. Currently, only USER/PASS authentication scheme of SocksV5 is supported.

Example: Socks-DeleGate

# delegated -P1080 SERVER=socks
Example: forwarding to an upstream Socks server
# delegated -P1080 SERVER=socks SOCKS=sockhost

To accept an incoming TCP connection via a SOCKS-DeleGate server, the network interface to be used for it is selected automatically by DeleGate (based on the DST.ADDR or DSTIP which is sent from a SOCKS client as the parameter of the BIND command). With the SRCIF parameter, you can select a network interface (and port number) manually, with the pseudo protocol name "tcpbind". The complete syntax of the parameter is SRCIF= "[host]:[port]:tcpbind[:dstHostList[:srcHostList]]". Typically, only the host filed is specified to select a network interface, like SRCIF="150.29.202.120::tcpbind" for example.

NOTE: When you chain DeleGate with another SOCKS server, it may cause problems in UDP relaying due to the private and tentative extensions to the SOCKS protocol by DeleGate. The following SRCIF parameters can be useful to escape such problems.

• SRCIF="host:port:socks-udp-tosv" -- network interface to servers
  SRCIF="0.0.0.0:0:socks-udp-tosv" makes DeleGate as a SOCKS client behave compliantly to the SOCKSv5 specification on UDP ASSOCIATE.
  
• SRCIF="host:port:socks-udp-tocl" -- network interface to clients
  SRCIF="0.0.0.0:0:socks-udp-tocl" suppresses the failure in DeleGate as a SOCKS server trying to bind a UDP socket to a specific port number.