Change Log ========== All relevant changes to the project are documented in this file. [v1.1][] - 2026-07-17 --------------------- ### Changes - `mquery`: new `-L` flag, ignore services on the local host - `libmdnsd`: new `mdnsd_set_local()` and `mdnsd_get_local()` APIs to ignore or allow local services. Backwards-compatible addition ### Fixes - Services on the same host as the querier are discoverable again; regression in v1.0 which caused clients such as `mquery` or `mdns-scan`, run on the device itself, to not see local services - `mdnsd`: fix an out-of-bounds memory access when a `.service` file contains a blank line, issue #95 [v1.0][] - 2026-07-06 --------------------- Full IPv6 transport, RFC 6763 compliant browsing, and multiple addresses per interface. Contributions from Thom Nichols, Florian La Roche, et al. ### Changes - `libmdnsd`, `mdnsd`, and `mquery`: full IPv6 support, querying and answering over the `ff02::fb` group, not just advertising AAAA records over IPv4, which was introduced in v0.12, issue #10 - `libmdnsd`: API and ABI break; the soname is now `libmdnsd.so.2` (`-version-info 2:0:0`) for the IPv6 and multiple-address changes, so dependent programs must be rebuilt - `mdnsd`: support multiple IPv4/IPv6 addresses per interface, with all services sharing one host name, by Thom Nichols, VoltServer, issue #77 - `mdnsd`: track interface and address changes over netlink, instead of polling, on Linux - `mquery`: add device discovery mode - `mquery`: browse by service type or host name (`.local.` implied), resolve any record type directly, decode `TXT` records, and print the `-D`/`-d` device table on Ctrl-C - RFC 6763 compliance: the service `PTR` now points at the service instance, and query responses carry the matching `SRV`, `TXT`, and address records in the additional section, issues #76 and #80 - mdnsd: keep key-only `TXT` attributes (boolean flags) instead of dropping them, issue #58 - Document resolving `.local` names on the host with `libnss-mdns`, in the README and manuals, issue #19 - `libmdnsd`: installed headers no longer pull in the build's `config.h`, so programs can build against the library again, issue #75 - `mdnsd`: send goodbye packets when an interface is removed, issue #91 - Unify the shell and unit tests under one Automake harness, issue #66 - Cleanups of const/static/unused and `-Wformat`, by Florian La Roche ### Fixes - Fix #37: `_lmatch()` read one byte past the root label - Fix #79: `mquery` sent malformed packets when known-answer suppression kicked in - Fix #84: use-after-free of a freed record in `uanswers` - Fix #92: use-after-free in `mdnsd_set_interface_addresses` - Fix #93: memory leak in `records_clear()` on config reload - Fix #94: undefined behavior when caching records with empty rdata - Fix conflict detection to consider all of an interface's addresses, by Thom Nichols, VoltServer, issue #82 - Fix a one-byte over-read in `txt2sd()` on well-formed input - Fix a memory overflow, by Hans Baumgartner - Update the cached records when an interface changes, by Zhu Yongjian [v0.12][] - 2023-01-22 ---------------------- IPv6 support, including a lot of fixes and cleanup again from the team at [devolo AG](https://www.devolo.com). ### Changes - libmdnsd, mquery, and mdnsd: add support for IPv6 AAAA records, including display in mquery, by Florian Zschocke, devolo AG - mdnsd: add `-H hostname` support, for testing purposes mainly - mquery: add `-l debug` support - mquery: Display every answer we get when in `mdnsd-scan` mode - Initial support for test framework, including unit testing w/ cmocka - Add support for disabling installation of man pages - Add support for building without `mquery` ### Fixes - Fix #11: port to other UNIX systems, currently tested on the following operating systems, except Linux, should also work on later versions: - FreeBSD 13 - NetBSD 9.1 - OpenBSD 6.8 - DragonFly BSD 5.8 - SunOS solaris 5.11 omnios-r151034 - Fix #49: various typos in log messages - Fix #52: double free, introduced in v0.11 - Fix #55: mDNS conflict check, fixed by Florian Zschocke, devolo AG - Fix #56: parsing of A record from packet must maintain network byte order, found and fixed by Florian Zschocke, devolo AG - Fix #65: libmdnsd: Make SPRIME actually a prime number, found and fixed by Florian Zschocke, devolo AG - Fix #74: fix segfault when mdnsd interface is removed [v0.11][] - 2022-01-09 ---------------------- Multiple interface support, and a lot of fixes again from the team at [devolo AG](https://www.devolo.com). ### Changes - Add support for multiple interfaces. Similar to running one mdnsd v0.10 per interface, sharing the same .conf files, issue #8 - Drop `-a ADDR` command line option, not applicable anymore - Drop `-p` command line option, not needed anymore - The `-i IFACE` option now limits mdnsd to run on one interface - Add support for query type ANY, by Peter Fleer, issue #34 - The libmdnsd function `mdnsd_step()` is now always non-blocking by employing `MSG_DONTWAIT` for its `sendto()` and `recvfrom()` ops - Create PID file when starting up, and touch on .conf reload. This is used by process supervisors like Finit to acknowledge that the process (mdnsd) is done and ready to serve requests again - Updated mquery tool to behave a bit more like mdns-scan(1), except with more command line options. mquery still only runs on one interface, unlike mdnsd itself ### Fixes - Fix #33: multiple code cleanups and minor fixes by Wolfgang Rösler - Fix #35: validate port number in .conf file - Fix #38: possible NULL pointer dereference and memory leaks when reading .conf files, by Wolfgang Rösler - Fix #39: multiple fixes by Peter Fleer - Fix conflict detection - If a conflict is detected, append `-index` suffix to hostname to uniqify the name -- this happens in multi-deploy scenarios - When reloading .conf files, delete previously published records - Drop own, looped back, multicast packets -- only if we detect it as our own published records - Send publish records only if probes have gone unanswered - Fix #43: `_ldecomp()` breaking on long name offsets, by Chris Beaumont [v0.10][] - 2020-05-06 ---------------------- Bug fix release, thanks to [devolo AG](https://www.devolo.com). ### Changes - Update man page and add `mdnsd.service.5` to document how to write service record files. ### Fixes - Memory leak fixes courtesy of Peter Fleer and Wolfram Rösler - Append text field to the TXT record instead of the A record, in the case of a PTR type, the name must also match. Found and fixed by Peter Fleer - Fix potential endless loop when decoding message labels, found and fixed by Wolfram Rösler - Skip message processing when the packet parser failed, found and fixed by Wolfram Rösler - Misc. fuzzer fixes, found and fixed by Wolfram Rösler [v0.9][] - 2020-04-02 --------------------- Bug fix and license clarification release. ### Changes - Update Debian packaging, split into several packages - Minor updates to README - Add manual pages mdnsd(8) and mquery(1) - Clarify placeholders in BSD-3 license, spotted by Thomas Bong ### Fixes - Fix #20: segfault that may occur when a new node is allocated, by Colin MacKenzie IV - Fix #22: check for both name *and* type in `mdnsd_find()`, otherwise any previous name matching may be considered an existing node, found and fixed by Thomas Bong - Fix #23: possible NULL pointer dereference when comparing strings [v0.8][] - 2018-08-23 --------------------- Huge thanks to Jeremie Miller for the original mDNS implementation, to Stefan Profanter for fixing the code from the early days, and also to Thom Nichols for careful testing and nudging me to finalize the work and get a proper release out there. Apologies for the terse change log, there are a lot of changes to Jer's original, in a sense this is a brand new project. This is a pre-release of the upcoming v1.0 with some important to remember limitations: - no IPv6, - only handles one interface (no multi-homing), and - only one A record can be announced per service ### Changes - Added support for systemd unit file - Added example SSH service record in `/etc/mdns.d/ssh.service` - Added support for building Debian/Ubuntu `.deb` packages - Renamed example mhttp appliation to mdnsd - Added support for running as a proper UNIX daemon - Added support for logging to syslog - Added proper option parsing - Added configuration file support, or rather DNS record file support - Added GNU configure & build system to ease building and portability - Added support for mDNS-SD service discovery/enumeration, i.e., the `mdns-scan` tool finds and reports services mdnsd announces - Added support for announcing multiple service records ### Fixes - Build fixes for recent versions of clang and gcc - Build fixes for Alpine Linux and other musl libc based systems - Default IP TTL value for multicast frames (224.0.0.251) is now 1 - Fixed endian problems and other issues with `mdns_set_ip()` - Fixed triggering of unicast reply to mDNS query due to missing `ntohs()` - Fixed service record TTLs; 120 and 4500 are RFC recommended values - Fixed memory leaks [UNRELEASED]: https://github.com/troglobit/mdnsd/compare/v1.1...HEAD [v1.1]: https://github.com/troglobit/mdnsd/compare/1.0...v1.1 [v1.0]: https://github.com/troglobit/mdnsd/compare/v0.12...v1.0 [v0.12]: https://github.com/troglobit/mdnsd/compare/v0.11...v0.12 [v0.11]: https://github.com/troglobit/mdnsd/compare/v0.10...v0.11 [v0.10]: https://github.com/troglobit/mdnsd/compare/v0.9...v0.10 [v0.9]: https://github.com/troglobit/mdnsd/compare/v0.8...v0.9 [v0.8]: https://github.com/troglobit/mdnsd/compare/v0.7G...v0.8