From: Bill Kelly <billk@...>
Date: 2008-04-18T08:39:25+09:00
Subject: Re: system(ping)

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Hi,

From: "Heinrich Piard" <linux@piard.de>
> I単aki Baz Castillo wrote:
>>
>> require 'ping'
>>
>> ip_list.each do { |ip|  Ping.pingecho(ip, 3)  }
>
> This Class does not support ICMP pings.

For what it's worth, here's a traceroute in ruby that uses ICMP:

http://code.google.com/p/rubyroute/

(The program is very short, so I've attached it to this email.)


Regards,

Bill


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#!/usr/bin/ruby=0A=
=0A=
require 'timeout'=0A=
require 'socket'=0A=
include Socket::Constants=0A=
=0A=
def random_port=0A=
	1024 + rand(64511)=0A=
end=0A=
=0A=
if ARGV[0].nil?=0A=
	puts "Usage: rubyroute host" ; exit 1 =0A=
end=0A=
=0A=
begin=0A=
	myname =3D Socket.gethostname =0A=
rescue SocketError =3D> err_msg=0A=
	puts "Can't get my own host name (#{err_msg})." ; exit 1=0A=
end=0A=
=0A=
puts "Tracing route to #{ARGV[0]}"=0A=
=0A=
ttl           =3D 1=0A=
max_ttl       =3D 255=0A=
localport     =3D random_port=0A=
dgram_sock    =3D UDPSocket::new=0A=
=0A=
begin=0A=
	dgram_sock.bind( myname, localport )=0A=
rescue =0A=
	localport =3D random_port=0A=
	retry=0A=
end=0A=
=0A=
icmp_sock     =3D Socket.open( Socket::PF_INET, Socket::SOCK_RAW, =
Socket::IPPROTO_ICMP )=0A=
icmp_sockaddr =3D Socket.pack_sockaddr_in( localport, myname )=0A=
icmp_sock.bind( icmp_sockaddr )=0A=
=0A=
begin=0A=
	dgram_sock.connect( ARGV[0], 999 )=0A=
rescue SocketError =3D> err_msg=0A=
	puts "Can't connect to remote host (#{err_msg})." ; exit 1=0A=
end=0A=
=0A=
until ttl =3D=3D max_ttl=0A=
	dgram_sock.setsockopt( 0, Socket::IP_TTL, ttl )=0A=
	dgram_sock.send( "RubyRoute says hello!", 0 )=0A=
=0A=
	begin=0A=
		Timeout::timeout( 1 ) {=0A=
			data, sender =3D icmp_sock.recvfrom( 8192 )=0A=
			# 20th and 21th bytes of IP+ICMP datagram carry the ICMP type and =
code resp.=0A=
			icmp_type =3D data.unpack( '@20C' )[0]=0A=
			icmp_code =3D data.unpack( '@21C' )[0]=0A=
			# Extract the ICMP sender from response.=0A=
			puts "TTL =3D #{ttl}:  " + Socket.unpack_sockaddr_in( sender )[1].to_s=0A=
			if    ( icmp_type =3D=3D 3 and icmp_code =3D=3D 13 )=0A=
					puts "'Communication Administratively Prohibited' from this hop."=0A=
			# ICMP 3/3 is port unreachable and usually means that we've hit the =
target.=0A=
			elsif ( icmp_type =3D=3D 3 and icmp_code =3D=3D 3 )=0A=
					puts "Destination reached. Trace complete."=0A=
					exit 0=0A=
			end=0A=
		}=0A=
	rescue Timeout::Error=0A=
		puts "Timeout error with TTL =3D #{ttl}!"=0A=
	end=0A=
=0A=
	ttl +=3D 1=0A=
end=0A=

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