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55 lines
1.2 KiB
Ruby
55 lines
1.2 KiB
Ruby
#
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# ping.rb -- check a host for upness
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#
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#= SYNOPSIS
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#
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# require 'ping'
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# print "'jimmy' is alive and kicking\n" if Ping.pingecho('jimmy', 10) ;
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#
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#= DESCRIPTION
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#
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# This module contains routines to test for the reachability of remote hosts.
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# Currently the only routine implemented is pingecho().
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#
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# pingecho() uses a TCP echo (I<not> an ICMP one) to determine if the
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# remote host is reachable. This is usually adequate to tell that a remote
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# host is available to rsh(1), ftp(1), or telnet(1) onto.
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#
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#== Parameters
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#
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# : hostname
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#
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# The remote host to check, specified either as a hostname or as an
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# IP address.
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#
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# : timeout
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#
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# The timeout in seconds. If not specified it will default to 5 seconds.
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#
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#= WARNING
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#
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# pingecho() uses user-level thread to implement the timeout, so it may block
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# for long period if named does not respond for some reason.
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#
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#=end
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module Ping
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require "socket"
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def pingecho(host, timeout=5)
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begin
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x = Thread.current
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y = Thread.start {
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sleep timeout
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x.raise RuntimeError if x.status
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}
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s = TCPsocket.new(host, "echo")
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s.close
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return TRUE
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rescue
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return FALSE;
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ensure
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Thread.kill y if y.status
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end
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end
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module_function "pingecho"
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end
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