Chapter 8. Working with Network Sockets and Binary Data
Most NSE scripts need to communicate to other hosts to read or write data. Lua supports native network I/O operations, but there are several advantages to using the interfaces and libraries provided by the Nmap Scripting Engine (NSE). NSE sockets can be programmed as blocking or non-blocking I/O operations, and they support a connect-style method (when a client opens a connection, sends or receives data, and closes the connection) and low-level raw packet handling via a packet capture interface.
Nsock (http://sock-raw.org/nmap-ncrack/nsock.html) is an Nmap library designed to help developers handle parallelizable network I/O operations. It is used by the service detection engine, in DNS operations ...
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