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#!/usr/bin/env python |
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#!/usr/bin/python33 |
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# Python implementation of RFC 6555 / Happy Eyeballs: find the quickest IPv4/IPv6 connection |
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# See https://tools.ietf.org/html/rfc6555 |
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# Method: Start parallel sessions using threads, and only wait for the quickest succesful socket connect |
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@ -11,20 +10,20 @@ from happyeyeballs import happyeyeballs |
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print happyeyeballs('newszilla.xs4all.nl', port=119) |
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""" |
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# or with more logging: |
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''' |
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""" |
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from happyeyeballs import happyeyeballs |
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import logging |
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logger = logging.getLogger('') |
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logger.setLevel(logging.DEBUG) |
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print happyeyeballs('newszilla.xs4all.nl', port=119) |
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''' |
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""" |
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import socket |
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import ssl |
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import queue |
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import threading |
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import time |
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import logging |
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import queue |
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DEBUG = False |
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@ -39,7 +38,7 @@ def do_socket_connect(queue, ip, PORT, SSL, ipv4delay): |
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if ip.find(':') >= 0: |
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s = socket.socket(socket.AF_INET6, socket.SOCK_STREAM) |
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if ip.find('.') >= 0: |
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time.sleep(ipv4delay) # IPv4 ... so a delay for IPv4 as we prefer IPv6. Note: ipv4delay could be 0 |
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time.sleep(ipv4delay) # IPv4 ... so a delay for IPv4 as we prefer IPv6. Note: ipv4delay could be 0 |
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
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s.settimeout(3) |
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@ -78,11 +77,11 @@ def happyeyeballs(HOST, **kwargs): |
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try: |
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preferipv6 = kwargs['preferipv6'] |
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except: |
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preferipv6 = True # prefer IPv6, so give IPv6 connects a head start by delaying IPv4 |
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preferipv6 = True # prefer IPv6, so give IPv6 connects a head start by delaying IPv4 |
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# Find out if a cached result is available, and recent enough: |
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timecurrent = int(time.time()) # current time in seconds since epoch |
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timecurrent = int(time.time()) # current time in seconds since epoch |
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retentionseconds = 100 |
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hostkey = (HOST, PORT, SSL, preferipv6) # Example key: (u'ssl.astraweb.com', 563, True, True) |
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try: |
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@ -102,7 +101,7 @@ def happyeyeballs(HOST, **kwargs): |
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# we only arrive here if the entry has to be determined. So let's do that: |
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# We have to determine the (new) best IP address |
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start = time.clock() |
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start = time.perf_counter() |
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if DEBUG: logging.debug("\n\n%s %s %s %s", HOST, PORT, SSL, preferipv6) |
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ipv4delay = 0 |
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@ -111,42 +110,42 @@ def happyeyeballs(HOST, **kwargs): |
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socket.getaddrinfo(HOST, PORT, socket.AF_INET6, socket.SOCK_STREAM, socket.IPPROTO_IP, socket.AI_CANONNAME) |
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if DEBUG: logging.debug("IPv6 address found for %s", HOST) |
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if preferipv6: |
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ipv4delay=0.1 # preferipv6, AND at least one IPv6 found, so give IPv4 (!) a delay so that IPv6 has a head start and is preferred |
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ipv4delay=0.1 # preferipv6, AND at least one IPv6 found, so give IPv4 (!) a delay so that IPv6 has a head start and is preferred |
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except: |
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if DEBUG: logging.debug("No IPv6 address found for %s", HOST) |
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myqueue = queue.Queue() # queue used for threads giving back the results |
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myqueue = queue.Queue() # queue used for threads giving back the results |
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try: |
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# Get all IP (IPv4 and IPv6) addresses: |
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# Get all IP (IPv4 and IPv6) addresses: |
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allinfo = socket.getaddrinfo(HOST, PORT, 0, 0, socket.IPPROTO_TCP) |
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for info in allinfo: |
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address = info[4][0] |
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thisthread = threading.Thread(target=do_socket_connect, args=(myqueue, address, PORT, SSL, ipv4delay)) |
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thisthread.daemon = True |
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thisthread.start() |
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result = None # default return value, used if none of threads says True/"OK", so no connect on any IP address |
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result = None # default return value, used if none of threads says True/"OK", so no connect on any IP address |
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# start reading from the Queue for message from the threads: |
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for i in range(len(allinfo)): |
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s = myqueue.get() # get a response |
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s = myqueue.get() # get a response |
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if s[1] == True: |
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result = s[0] |
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break # the first True/"OK" is enough, so break out of for loop |
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break # the first True/"OK" is enough, so break out of for loop |
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except: |
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if DEBUG: logging.debug("something went wrong in the try block") |
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result = None |
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logging.info("Quickest IP address for %s (port %s, ssl %s, preferipv6 %s) is %s", HOST, PORT, SSL, preferipv6, result) |
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delay = int(1000 * (time.clock() - start)) |
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delay = int(1000 * (time.perf_counter() - start)) |
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logging.debug("Happy Eyeballs lookup and port connect took %s ms", delay) |
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# We're done. Store and return the result |
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if result: |
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happyeyeballs.happylist[hostkey] = ( result, timecurrent ) |
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if DEBUG: logging.debug("Determined new result for %s with result %s", (hostkey, happyeyeballs.happylist[hostkey]) ) |
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if DEBUG: logging.debug("Determined new result for %s with result %s", hostkey, happyeyeballs.happylist[hostkey] ) |
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return result |
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happyeyeballs.happylist = {} # The cached results. This static variable must be after the def happyeyeballs() |
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happyeyeballs.happylist = {} # The cached results. This static variable must be after the def happyeyeballs() |
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@ -156,23 +155,23 @@ if __name__ == '__main__': |
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logger.setLevel(logging.INFO) |
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if DEBUG: logger.setLevel(logging.DEBUG) |
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# plain HTTP/HTTPS sites: |
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print((happyeyeballs('www.google.com'))) |
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print((happyeyeballs('www.google.com', port=443, ssl=True))) |
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print((happyeyeballs('www.nu.nl'))) |
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# newsservers: |
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print((happyeyeballs('newszilla6.xs4all.nl', port=119))) |
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print((happyeyeballs('newszilla.xs4all.nl', port=119))) |
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print((happyeyeballs('block.cheapnews.eu', port=119))) |
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print((happyeyeballs('block.cheapnews.eu', port=443, ssl=True))) |
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print((happyeyeballs('sslreader.eweka.nl', port=563, ssl=True))) |
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print((happyeyeballs('news.thundernews.com', port=119))) |
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print((happyeyeballs('news.thundernews.com', port=119, preferipv6=False))) |
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print((happyeyeballs('secure.eu.thundernews.com', port=563, ssl=True))) |
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# Strange cases |
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print((happyeyeballs('does.not.resolve', port=443, ssl=True))) |
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print((happyeyeballs('www.google.com', port=119))) |
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print((happyeyeballs('216.58.211.164'))) |
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# plain HTTP/HTTPS sites: |
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print((happyeyeballs('www.google.com'))) |
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print((happyeyeballs('www.google.com', port=443, ssl=True))) |
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print((happyeyeballs('www.nu.nl'))) |
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# newsservers: |
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print((happyeyeballs('newszilla6.xs4all.nl', port=119))) |
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print((happyeyeballs('newszilla.xs4all.nl', port=119))) |
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print((happyeyeballs('block.cheapnews.eu', port=119))) |
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print((happyeyeballs('block.cheapnews.eu', port=443, ssl=True))) |
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print((happyeyeballs('sslreader.eweka.nl', port=563, ssl=True))) |
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print((happyeyeballs('news.thundernews.com', port=119))) |
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print((happyeyeballs('news.thundernews.com', port=119, preferipv6=False))) |
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print((happyeyeballs('secure.eu.thundernews.com', port=563, ssl=True))) |
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# Strange cases |
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print((happyeyeballs('does.not.resolve', port=443, ssl=True))) |
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print((happyeyeballs('www.google.com', port=119))) |
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print((happyeyeballs('216.58.211.164'))) |
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Safihre
7 years ago