#!/usr/bin/python -S
# Prints one of the IP addresses of each of the hostnames given on the
# command line.  If no arguments are given, returns nonzero.
# Only prints addresses that have an active IP route to them.
import errno
import socket
import sys

TEST_PORT = 123

ok = 0
for i in sys.argv[1:]:
  try:
    ailist = socket.getaddrinfo(i, TEST_PORT,
                                socket.AF_UNSPEC, socket.SOCK_DGRAM)
  except socket.error as e:
    sys.stderr.write('%s: %r: %s\n' % (sys.argv[0], i, e))
  else:
    for family, _, _, _, addr in ailist:
      s = socket.socket(family, socket.SOCK_DGRAM)
      try:
        # Datagram sockets don't actually "connect" here.  This just
        # tests whether we have a route that can handle it.
        s.connect(addr)
      except socket.error as e:
        if e.errno != errno.ENETUNREACH:
          sys.stderr.write('%s: %r: %s\n' % (sys.argv[0], addr, e))
      else:
        print addr[0]
        ok = 1
sys.exit(0 if ok else 1)