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#!/usr/bin/env python3
# This script tries to bind to a privileged port on each of the IP addresses
# specified on the command line.
import errno
import socket
import sys
PORT = 7 # echo
results = dict()
try:
for ip in sys.argv[1:]:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
s.bind((ip, PORT))
except OSError as x:
if (x.errno in (errno.EACCES, errno.EADDRNOTAVAIL)):
results[ip] = x.errno
else:
raise
else:
results[ip] = 0
except Exception as x:
print('ERROR\texception: %s' % x)
rc = 1
else:
if (len(results) < 1):
print('ERROR\tnothing to test', end='')
rc = 1
elif (len(set(results.values())) != 1):
print('ERROR\tmixed results: ', end='')
rc = 1
else:
result = next(iter(results.values()))
if (result != 0):
print('SAFE\t%d (%s) ' % (result, errno.errorcode[result]), end='')
rc = 0
else:
print('RISK\tsuccessful bind ', end='')
rc = 1
explanation = ' '.join('%s=%d' % (ip, e)
for (ip, e) in sorted(results.items()))
print(explanation)
sys.exit(rc)
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