Honeyd Implementation

TCP/UDP ports may be connected to an arbitrary service.

add template tcp port 23 "sh scripts/router.pl"

Honeyd forks child process to execute service application.

Stdin/out is connected via socketpair to connection.
Stderr is just a pipe and used for service syslog.

Libevent handles incoming and outgoing data:
New I/O channels just get added without extra complication for the application.