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Pure Python Multicast DNS Service Discovery Library (Bonjour/Avahi compatible)

Project description

python-zeroconf

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Documentation.

This is fork of pyzeroconf, Multicast DNS Service Discovery for Python, originally by Paul Scott-Murphy (https://github.com/paulsm/pyzeroconf), modified by William McBrine (https://github.com/wmcbrine/pyzeroconf).

The original William McBrine’s fork note:

This fork is used in all of my TiVo-related projects: HME for Python
(and therefore HME/VLC), Network Remote, Remote Proxy, and pyTivo.
Before this, I was tracking the changes for zeroconf.py in three
separate repos. I figured I should have an authoritative source.

Although I make changes based on my experience with TiVos, I expect that
they're generally applicable. This version also includes patches found
on the now-defunct (?) Launchpad repo of pyzeroconf, and elsewhere
around the net -- not always well-documented, sorry.

Compatible with:

  • Bonjour

  • Avahi

Compared to some other Zeroconf/Bonjour/Avahi Python packages, python-zeroconf:

  • isn’t tied to Bonjour or Avahi

  • doesn’t use D-Bus

  • doesn’t force you to use particular event loop or Twisted

  • is pip-installable

  • has PyPI distribution

Python compatibility

  • CPython 3.5+

  • PyPy3 5.8+

Versioning

This project’s versions follow the following pattern: MAJOR.MINOR.PATCH.

  • MAJOR version has been 0 so far

  • MINOR version is incremented on backward incompatible changes

  • PATCH version is incremented on backward compatible changes

Status

There are some people using this package. I don’t actively use it and as such any help I can offer with regard to any issues is very limited.

IPv6 support

IPv6 support is relatively new and currently limited, specifically:

  • InterfaceChoice.All is an alias for InterfaceChoice.Default on non-POSIX systems.

  • On Windows specific interfaces can only be requested as interface indexes, not as IP addresses.

  • Dual-stack IPv6 sockets are used, which may not be supported everywhere (some BSD variants do not have them).

  • Listening on localhost (::1) does not work. Help with understanding why is appreciated.

How to get python-zeroconf?

The easiest way to install python-zeroconf is using pip:

pip install zeroconf

How do I use it?

Here’s an example of browsing for a service:

from zeroconf import ServiceBrowser, Zeroconf


class MyListener:

    def remove_service(self, zeroconf, type, name):
        print("Service %s removed" % (name,))

    def add_service(self, zeroconf, type, name):
        info = zeroconf.get_service_info(type, name)
        print("Service %s added, service info: %s" % (name, info))


zeroconf = Zeroconf()
listener = MyListener()
browser = ServiceBrowser(zeroconf, "_http._tcp.local.", listener)
try:
    input("Press enter to exit...\n\n")
finally:
    zeroconf.close()

If you don’t know the name of the service you need to browse for, try:

from zeroconf import ZeroconfServiceTypes
print('\n'.join(ZeroconfServiceTypes.find()))

See examples directory for more.

Changelog

0.27.1

  • Improved the logging situation (includes fixing a false-positive “packets() made no progress adding records”, thanks to Greg Badros)

0.27.0

  • Large multi-resource responses are now split into separate packets which fixes a bad mdns-repeater/ChromeCast Audio interaction ending with ChromeCast Audio crash (and possibly some others) and improves RFC 6762 compliance, thanks to Greg Badros

  • Added a warning presented when the listener passed to ServiceBrowser lacks update_service() callback

  • Added support for finding all services available in the browser example, thanks to Perry Kunder

Backwards incompatible:

  • Removed previously deprecated ServiceInfo address constructor parameter and property

0.26.3

  • Improved readability of logged incoming data, thanks to Erik Montnemery

  • Threads are given unique names now to aid debugging, thanks to Erik Montnemery

  • Fixed a regression where get_service_info() called within a listener add_service method would deadlock, timeout and incorrectly return None, fix thanks to Erik Montnemery, but Matt Saxon and Hmmbob were also involved in debugging it.

0.26.2

  • Added support for multiple types to ServiceBrowser, thanks to J. Nick Koston

  • Fixed a race condition where a listener gets a message before the lock is created, thanks to J. Nick Koston

0.26.1

  • Fixed a performance regression introduced in 0.26.0, thanks to J. Nick Koston (this is close in spirit to an optimization made in 0.24.5 by the same author)

0.26.0

  • Fixed a regression where service update listener wasn’t called on IP address change (it’s called on SRV/A/AAAA record changes now), thanks to Matt Saxon

Technically backwards incompatible:

  • Service update hook is no longer called on service addition (service added hook is still called), this is related to the fix above

0.25.1

  • Eliminated 5s hangup when calling Zeroconf.close(), thanks to Erik Montnemery

0.25.0

  • Reverted uniqueness assertions when browsing, they caused a regression

Backwards incompatible:

  • Rationalized handling of TXT records. Non-bytes values are converted to str and encoded to bytes using UTF-8 now, None values mean value-less attributes. When receiving TXT records no decoding is performed now, keys are always bytes and values are either bytes or None in value-less attributes.

0.24.5

  • Fixed issues with shared records being used where they shouldn’t be (TXT, SRV, A records are unique now), thanks to Matt Saxon

  • Stopped unnecessarily excluding host-only interfaces from InterfaceChoice.all as they don’t forbid multicast, thanks to Andreas Oberritter

  • Fixed repr() of IPv6 DNSAddress, thanks to Aldo Hoeben

  • Removed duplicate update messages sent to listeners, thanks to Matt Saxon

  • Added support for cooperating responders, thanks to Matt Saxon

  • Optimized handle_response cache check, thanks to J. Nick Koston

  • Fixed memory leak in DNSCache, thanks to J. Nick Koston

0.24.4

  • Fixed resetting TTL in DNSRecord.reset_ttl(), thanks to Matt Saxon

  • Improved various DNS class’ string representations, thanks to Jay Hogg

0.24.3

  • Fixed import-time “TypeError: ‘ellipsis’ object is not iterable.” on CPython 3.5.2

0.24.2

  • Added support for AWDL interface on macOS (needed and used by the opendrop project but should be useful in general), thanks to Milan Stute

  • Added missing type hints

0.24.1

  • Applied some significant performance optimizations, thanks to Jaime van Kessel for the patch and to Ghostkeeper for performance measurements

  • Fixed flushing outdated cache entries when incoming record is unique, thanks to Michael Hu

  • Fixed handling updates of TXT records (they’d not get recorded previously), thanks to Michael Hu

0.24.0

  • Added IPv6 support, thanks to Dmitry Tantsur

  • Added additional recommended records to PTR responses, thanks to Scott Mertz

  • Added handling of ENOTCONN being raised during shutdown when using Eventlet, thanks to Tamás Nepusz

  • Included the py.typed marker in the package so that type checkers know to use type hints from the source code, thanks to Dmitry Tantsur

0.23.0

  • Added support for MyListener call getting updates to service TXT records, thanks to Matt Saxon

  • Added support for multiple addresses when publishing a service, getting/setting single address has become deprecated. Change thanks to Dmitry Tantsur

Backwards incompatible:

  • Dropped Python 3.4 support

0.22.0

  • A lot of maintenance work (tooling, typing coverage and improvements, spelling) done, thanks to Ville Skyttä

  • Provided saner defaults in ServiceInfo’s constructor, thanks to Jorge Miranda

  • Fixed service removal packets not being sent on shutdown, thanks to Andrew Bonney

  • Added a way to define TTL-s through ServiceInfo contructor parameters, thanks to Andrew Bonney

Technically backwards incompatible:

  • Adjusted query intervals to match RFC 6762, thanks to Andrew Bonney

  • Made default TTL-s match RFC 6762, thanks to Andrew Bonney

0.21.3

  • This time really allowed incoming service names to contain underscores (patch released as part of 0.21.0 was defective)

0.21.2

  • Fixed import-time typing-related TypeError when older typing version is used

0.21.1

  • Fixed installation on Python 3.4 (we use typing now but there was no explicit dependency on it)

0.21.0

  • Added an error message when importing the package using unsupported Python version

  • Fixed TTL handling for published service

  • Implemented unicast support

  • Fixed WSL (Windows Subsystem for Linux) compatibility

  • Fixed occasional UnboundLocalError issue

  • Fixed UTF-8 multibyte name compression

  • Switched from netifaces to ifaddr (pure Python)

  • Allowed incoming service names to contain underscores

0.20.0

  • Dropped support for Python 2 (this includes PyPy) and 3.3

  • Fixed some class’ equality operators

  • ServiceBrowser entries are being refreshed when ‘stale’ now

  • Cache returns new records first now instead of last

0.19.1

  • Allowed installation with netifaces >= 0.10.6 (a bug that was concerning us got fixed)

0.19.0

0.18.0

  • Dropped Python 2.6 support

  • Improved error handling inside code executed when Zeroconf object is being closed

0.17.7

  • Better Handling of DNS Incoming Packets parsing exceptions

  • Many exceptions will now log a warning the first time they are seen

  • Catch and log sendto() errors

  • Fix/Implement duplicate name change

  • Fix overly strict name validation introduced in 0.17.6

  • Greatly improve handling of oversized packets including:

    • Implement name compression per RFC1035

    • Limit size of generated packets to 9000 bytes as per RFC6762

    • Better handle over sized incoming packets

  • Increased test coverage to 95%

0.17.6

  • Many improvements to address race conditions and exceptions during ZC() startup and shutdown, thanks to: morpav, veawor, justingiorgi, herczy, stephenrauch

  • Added more test coverage: strahlex, stephenrauch

  • Stephen Rauch contributed:

    • Speed up browser startup

    • Add ZeroconfServiceTypes() query class to discover all advertised service types

    • Add full validation for service names, types and subtypes

    • Fix for subtype browsing

    • Fix DNSHInfo support

0.17.5

  • Fixed OpenBSD compatibility, thanks to Alessio Sergi

  • Fixed race condition on ServiceBrowser startup, thanks to gbiddison

  • Fixed installation on some Python 3 systems, thanks to Per Sandström

  • Fixed “size change during iteration” bug on Python 3, thanks to gbiddison

0.17.4

  • Fixed support for Linux kernel versions < 3.9 (thanks to Giovanni Harting and Luckydonald, GitHub pull request #26)

0.17.3

  • Fixed DNSText repr on Python 3 (it’d crash when the text was longer than 10 bytes), thanks to Paulus Schoutsen for the patch, GitHub pull request #24

0.17.2

  • Fixed installation on Python 3.4.3+ (was failing because of enum34 dependency which fails to install on 3.4.3+, changed to depend on enum-compat instead; thanks to Michael Brennan for the original patch, GitHub pull request #22)

0.17.1

  • Fixed EADDRNOTAVAIL when attempting to use dummy network interfaces on Windows, thanks to daid

0.17.0

  • Added some Python dependencies so it’s not zero-dependencies anymore

  • Improved exception handling (it’ll be quieter now)

  • Messages are listened to and sent using all available network interfaces by default (configurable); thanks to Marcus Müller

  • Started using logging more freely

  • Fixed a bug with binary strings as property values being converted to False (https://github.com/jstasiak/python-zeroconf/pull/10); thanks to Dr. Seuss

  • Added new ServiceBrowser event handler interface (see the examples)

  • PyPy3 now officially supported

  • Fixed ServiceInfo repr on Python 3, thanks to Yordan Miladinov

0.16.0

  • Set up Python logging and started using it

  • Cleaned up code style (includes migrating from camel case to snake case)

0.15.1

  • Fixed handling closed socket (GitHub #4)

0.15

  • Forked by Jakub Stasiak

  • Made Python 3 compatible

  • Added setup script, made installable by pip and uploaded to PyPI

  • Set up Travis build

  • Reformatted the code and moved files around

  • Stopped catching BaseException in several places, that could hide errors

  • Marked threads as daemonic, they won’t keep application alive now

0.14

  • Fix for SOL_IP undefined on some systems - thanks Mike Erdely.

  • Cleaned up examples.

  • Lowercased module name.

0.13

  • Various minor changes; see git for details.

  • No longer compatible with Python 2.2. Only tested with 2.5-2.7.

  • Fork by William McBrine.

0.12

  • allow selection of binding interface

  • typo fix - Thanks A. M. Kuchlingi

  • removed all use of word ‘Rendezvous’ - this is an API change

0.11

  • correction to comments for addListener method

  • support for new record types seen from OS X - IPv6 address - hostinfo

  • ignore unknown DNS record types

  • fixes to name decoding

  • works alongside other processes using port 5353 (e.g. on Mac OS X)

  • tested against Mac OS X 10.3.2’s mDNSResponder

  • corrections to removal of list entries for service browser

0.10

  • Jonathon Paisley contributed these corrections:

    • always multicast replies, even when query is unicast

    • correct a pointer encoding problem

    • can now write records in any order

    • traceback shown on failure

    • better TXT record parsing

    • server is now separate from name

    • can cancel a service browser

  • modified some unit tests to accommodate these changes

0.09

  • remove all records on service unregistration

  • fix DOS security problem with readName

0.08

  • changed licensing to LGPL

0.07

  • faster shutdown on engine

  • pointer encoding of outgoing names

  • ServiceBrowser now works

  • new unit tests

0.06

  • small improvements with unit tests

  • added defined exception types

  • new style objects

  • fixed hostname/interface problem

  • fixed socket timeout problem

  • fixed add_service_listener() typo bug

  • using select() for socket reads

  • tested on Debian unstable with Python 2.2.2

0.05

  • ensure case insensitivty on domain names

  • support for unicast DNS queries

0.04

  • added some unit tests

  • added __ne__ adjuncts where required

  • ensure names end in ‘.local.’

  • timeout on receiving socket for clean shutdown

License

LGPL, see COPYING file for details.

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