How to get the IPs of all the interfaces in my host?

Ruby
1

Hi, basically I’m looking for a way to find all the IP’s in the
network interfaces of my computer in a reliable way.

I know a “workaround”:

UDPSocket.open {|s| s.connect “1.2.3.4”, 80; s.addr }

=> [“AF_INET”, 33564, “192.168.1.16”, “192.168.1.16”]

But this method knows nothing about other IP’s in the same interface,
neither allows me to discover other IP’s in other interfaces with
different routes.

Is there something as “ifconfig” or “ip addr show” commands for Ruby?
Thanks a lot.

2

2011/5/11 Iñaki Baz C. [email protected]:

But this method knows nothing about other IP’s in the same interface,
neither allows me to discover other IP’s in other interfaces with
different routes.

I got another way:

Socket::getaddrinfo(Socket.gethostname, “echo”, Socket::AF_INET).map
{ |x| x[3] }

=> [“127.0.0.1”, “127.0.0.1”, “127.0.1.1”, “127.0.1.1”,
“192.168.1.16”, “192.168.1.16”]

Not very cool, but…

PS: There is also a ruby-ifconfig library, not available via gem it
seems.

3

Iñaki Baz C. [email protected] wrote:

Hi, basically I’m looking for a way to find all the IP’s in the
network interfaces of my computer in a reliable way.

Is there something as “ifconfig” or “ip addr show” commands for Ruby?
Thanks a lot.

in Ruby 1.9.2:

require ‘socket’
Socket.ip_address_list

4

2011/5/11 Eric W. [email protected]:

Is there something as “ifconfig” or “ip addr show” commands for Ruby?
Thanks a lot.

in Ruby 1.9.2:

require ‘socket’
Socket.ip_address_list

Amazing! I knew nothing about it :slight_smile:

Thanks a lot.