ipsocket ttl

[Dave King]

I was wondering if there is any way to specify the time-to-live value of
an IP socket in ruby?

 

[Guillaume Marcais]

Le 2 f=E9vr. 06, =E0 22:48, Dave King a =E9crit :

I was wondering if there is any way to specify the time-to-live value=20=

of
an IP socket in ruby?

This might be platform dependent. On Linux, look at 'man 7 ip' and=20
IP_TTL. In Ruby, you would do the same thing, call the #setsockopt=20
method on your socket.

In Ruby:

irb(main):001:0> require 'socket'
=3D> true
irb(main):002:0> s =3D UDPSocket.new
=3D> #<UDPSocket:0xb7b86a54>
irb(main):004:0> s.getsockopt(Socket::SOL_IP, Socket::IP_TTL)
=3D> "@\000\000\000"
irb(main):005:0> s.getsockopt(Socket::SOL_IP,=20
Socket::IP_TTL).unpack("L")
=3D> [64]
irb(main):006:0> s.setsockopt(Socket::SOL_IP, Socket::IP_TTL,=20
[128].pack("L"))
=3D> 0
irb(main):007:0> s.getsockopt(Socket::SOL_IP,=20
Socket::IP_TTL).unpack("L")
=3D> [128]

To check if a given argument to #getsockopt is supported on your=20
platform, you can look at the constants defined with Socket.constants.

Hope this help,
Guillaume.