Retrieves the list of exit relays from a local tor daemon. Requires twisted and txtorcon. Adapted from txtorsocks/examples/get_info.py

get_exit_relays.py

#!/usr/bin/env python

import sys
import io

from twisted.internet import reactor, defer
from txtorcon import TorInfo, build_local_tor_connection, Router

def error(x):
    print "ERROR", x
    return x


@defer.inlineCallbacks
def setup_complete(info):
    ns_all = yield info.ns.all()
    lines = ns_all.split('\n')

    exit_routers = []
    for i in range(0, len(lines), 3):
        r = lines[i]
        s = lines[i+1]
	w = lines[i+2]
        
        router = Router(None)
	router.update(*r.split(' ')[1:-1])
        router.from_consensus = True
        router.flags = s.split(' ')[1:]
	if 'exit' in router.flags:
	    exit_routers.append(router)
    
    print 'Num of relays: %d' % (len(lines)/3)
    print 'Num of exit routers: %d' % len(exit_routers)
    reactor.stop()


def setup_failed(arg):
    print "SETUP FAILED", arg
    reactor.stop()


def bootstrap(c):
    info = TorInfo(c)
    info.post_bootstrap.addCallback(setup_complete).addErrback(setup_failed)

d = build_local_tor_connection(reactor, build_state=False)
d.addCallback(bootstrap).addErrback(setup_failed)

reactor.run()