Find my server ip address with Twisted

Question

How can I find my server ip address asynchronously with Twisted ?

I am running an ubuntu and a centos and the results are always the same, the ip returned from the methods exposed belows are always: 127.0.1.1 instead of my real private ip address.

EDIT: this isn't a duplicate of this question as proposed, my last try is inspired from this answer, what I want is a way to achieve this in asynchrounous way.

Trying to retrieve the ip with a tcp server

from twisted.internet import protocol, endpoints, reactor


class FindIpClient(protocol.Protocol):

    def connectionMade(self):
        print self.transport.getPeer()  # prints 127.0.1.1
        self.transport.loseConnection()


def main():
    f = protocol.ClientFactory()
    f.protocol = FindIpClient
    ep = endpoints.clientFromString(reactor, 'tcp:127.0.0.1:1234')
    ep.connect(f)
    reactor.run()

main()

Using reactor.resolve

import socket

from twisted.internet import reactor


def gotIP(ip):
    print(ip)  # prints 127.0.1.1
    reactor.stop()


reactor.resolve(socket.getfqdn()).addCallback(gotIP)
reactor.run()

This works, but I am not sure about its asynchronous-ity

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(('8.8.8.8', 0))
s.setblocking(False)
local_ip_address = s.getsockname()[0]
print(local_ip_address)  # prints 10.0.2.40

How can I get my private ip address asynchrounously ?

Here is my /etc/hosts if it can help:

127.0.0.1 localhost
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
127.0.1.1 mymachine mymachine

I don't know why I have 127.0.1.1 mymachine mymachine in my hosts btw :/

Possible duplicate of [Finding local IP addresses using Python's stdlib](http://stackoverflow.com/questions/166506/finding-local-ip-addresses-using-pythons-stdlib) — OneCricketeer, Feb 04 '16 at 15:59
What exactly is your "real private address"? How do you define that? — deceze, Feb 04 '16 at 16:00
Hmm, then your `/etc/hosts` file must have that as your loopback address. — OneCricketeer, Feb 04 '16 at 16:02
I mean the ip address bound on my eth0, in my case something like 10.0.2.40 — kitensei, Feb 04 '16 at 16:02
Why do you need an asynchronous method? There is no long-running operation, you are just making a server-side socket object and grabbing some metadata about it. — OneCricketeer, Feb 04 '16 at 16:04
I am beginning with twisted, I want to be sure that I don't run any *possibly long* operations. I'd also like to kow why on Linuxes the `socket.getfqdn()` resolve doesn't work — kitensei, Feb 04 '16 at 16:06
How about inspecting something like `ifconfig` and look for `eth0` then? I'd be surprised if there wasn't a Python wrapper for this even. — deceze, Feb 04 '16 at 16:07
I don't know that `local_ip_address = s.getsockname()[0]` could be any more "possibly long" than anything else. — Wayne Werner, Feb 04 '16 at 16:10

score 0 · Answer 1 · answered Nov 01 '17 at 22:53

0

From Python Twisted: restricting access by IP address

d = self.transport.getHost () ; print d.type, d.host, d.port

Doesn't work for some protocols like receiving on a broadcast UDP

answered Nov 01 '17 at 22:53

charo

715
1
7
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score -3 · Accepted Answer · answered Feb 05 '16 at 08:30

-3

I've ended up keeping this solution as it cannot be long :

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(('8.8.8.8', 0))
s.setblocking(False)
local_ip_address = s.getsockname()[0]
print(local_ip_address)  # prints 10.0.2.40

answered Feb 05 '16 at 08:30

kitensei

2,510
2
42
68

it's a `twisted` question and you answer `sockets`? – senaps Jun 26 '18 at 04:52

Find my server ip address with Twisted

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