# hs.network.host

This sub-module provides functions for acquiring host information, such as hostnames, addresses, and reachability.

# API Overview

Functions - API calls offered directly by the extension

  • addressesForHostname
  • hostnamesForAddress
  • reachabilityForAddress
  • reachabilityForHostname

Methods - API calls which can only be made on an object returned by a constructor

  • cancel
  • isRunning

# API Documentation

# Functions

# addressesForHostname

Signature hs.network.host.addressesForHostname(name[, fn]) -> table | hostObject
Type Function
Description Get IP addresses for the hostname specified.
Parameters
  • name - the hostname to lookup IP addresses for
  • fn - an optional callback function which, when provided, will perform the address resolution in an asynchronous, non-blocking manner.
Returns
  • If this function is called without a callback function, returns a table containing the IP addresses for the specified name. If a callback function is specified, then a host object is returned.
Notes
  • If no callback function is provided, the resolution occurs in a blocking manner which may be noticeable when network access is slow or erratic.
  • If a callback function is provided, this function acts as a constructor, returning a host object and the callback function will be invoked when resolution is complete. The callback function should take two parameters: the string "addresses", indicating that an address resolution occurred, and a table containing the IP addresses identified.
  • Generates an error if network access is currently disabled or the hostname is invalid.
Examples None
Source extensions/network/libnetwork_host.m line 268

# hostnamesForAddress

Signature hs.network.host.hostnamesForAddress(address[, fn]) -> table | hostObject
Type Function
Description Get hostnames for the IP address specified.
Parameters
  • address - a string or number representing an IPv4 or IPv6 network address to lookup hostnames for. If the argument is a number, it is treated as the 32 bit numerical representation of an IPv4 address.
  • fn - an optional callback function which, when provided, will perform the hostname resolution in an asynchronous, non-blocking manner.
Returns
  • If this function is called without a callback function, returns a table containing the hostnames for the specified address. If a callback function is specified, then a host object is returned.
Notes
  • If no callback function is provided, the resolution occurs in a blocking manner which may be noticeable when network access is slow or erratic.
  • If a callback function is provided, this function acts as a constructor, returning a host object and the callback function will be invoked when resolution is complete. The callback function should take two parameters: the string "names", indicating that hostname resolution occurred, and a table containing the hostnames identified.
  • Generates an error if network access is currently disabled or the IP address is invalid.
Examples None
Source extensions/network/libnetwork_host.m line 287

# reachabilityForAddress

Signature hs.network.host.reachabilityForAddress(address[, fn]) -> integer | hostObject
Type Function
Description Get the reachability status for the IP address specified.
Parameters
  • address - a string or number representing an IPv4 or IPv6 network address to check the reachability for. If the argument is a number, it is treated as the 32 bit numerical representation of an IPv4 address.
  • fn - an optional callback function which, when provided, will determine the address reachability in an asynchronous, non-blocking manner.
Returns
  • If this function is called without a callback function, returns the numeric representation of the address reachability status. If a callback function is specified, then a host object is returned.
Notes
  • If no callback function is provided, the resolution occurs in a blocking manner which may be noticeable when network access is slow or erratic.
  • If a callback function is provided, this function acts as a constructor, returning a host object and the callback function will be invoked when resolution is complete. The callback function should take two parameters: the string "reachability", indicating that reachability was determined, and the numeric representation of the address reachability status.
  • Generates an error if network access is currently disabled or the IP address is invalid.
  • The numeric representation is made up from a combination of the flags defined in hs.network.reachability.flags.
  • Performs the same reachability test as hs.network.reachability.forAddress.
Examples None
Source extensions/network/libnetwork_host.m line 306

# reachabilityForHostname

Signature hs.network.host.reachabilityForHostname(name[, fn]) -> integer | hostObject
Type Function
Description Get the reachability status for the IP address specified.
Parameters
  • name - the hostname to check the reachability for. If the argument is a number, it is treated as the 32 bit numerical representation of an IPv4 address.
  • fn - an optional callback function which, when provided, will determine the address reachability in an asynchronous, non-blocking manner.
Returns
  • If this function is called without a callback function, returns the numeric representation of the hostname reachability status. If a callback function is specified, then a host object is returned.
Notes
  • If no callback function is provided, the resolution occurs in a blocking manner which may be noticeable when network access is slow or erratic.
  • If a callback function is provided, this function acts as a constructor, returning a host object and the callback function will be invoked when resolution is complete. The callback function should take two parameters: the string "reachability", indicating that reachability was determined, and the numeric representation of the hostname reachability status.
  • Generates an error if network access is currently disabled or the IP address is invalid.
  • The numeric representation is made up from a combination of the flags defined in hs.network.reachability.flags.
  • Performs the same reachability test as hs.network.reachability.forHostName.
Examples None
Source extensions/network/libnetwork_host.m line 327

# Methods

# cancel

Signature hs.network.host:cancel() -> hostObject
Type Method
Description Cancels an in-progress asynchronous host resolution.
Parameters
  • None
Returns
  • the hostObject
Notes
  • This method has no effect if the resolution has already completed.
Examples None
Source extensions/network/libnetwork_host.m line 367

# isRunning

Signature hs.network.host:isRunning() -> boolean
Type Method
Description Returns whether or not resolution is still in progress for an asynchronous query.
Parameters
  • None
Returns
  • true, if resolution is still in progress, or false if resolution has already completed.
Notes None
Examples None
Source extensions/network/libnetwork_host.m line 350

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