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ChangeLog

All notable changes to the project are documented in this file.

v2.5.7 - 2024-05-09

Fixes

  • Fix #207: crash when adding IPv6 multicast route on a kernel without IPv6 multicast support

v2.5.6 - 2022-11-28

Despite the new smcroutectl batch mode feature, this is primarily a bug fix release. Most notably #183 and #187.

Changes

  • Add smcroutectl batch support, issue #189. Based on the IPC support added in issue #185, by Alexey Smirnov:

      ~$ sudo smcroutectl -b <<-EOF
         join eth0 225.1.2.3
         add eth0 192.168.1.42 225.1.2.3 eth1 eth2
         rem eth1 225.3.4.5 eth3
         leave eth1 225.3.4.5
         EOF
  ~$

Fixes

  • Fix #178: invalid systemd daemon type Simple/Notify vs simple/notify
  • Fix #179: typo in wildcard routes section of README
  • Fix #180: minor typo in file and directory names in documentation
  • Fix #183: casting in IPC code hides error handling of recv()
  • Fix #186: NULL pointer dereference in utimensat() replacement function. Found accidentally by Alexey Smirnov. Only triggered on systems that don't have a native utimensat() in their C-library, or if you try to build SMCRoute without using its own build system ...
  • Fix #187: strange behavior joining/leaving the same group
  • Fix #192: typo in README

v2.5.5 - 2021-11-21

Changes

  • Revert extraction of version from GIT tag. Incompatible with systems that do autoreconf on a dist. tarball

Fixes

  • Fix #175: Parse error in /etc/smcroute.conf. SMCRoute fails to start on interfaces with mrdisc disabled, when built with mrdisc support and -N passed on command line

v2.5.4 - 2021-11-13

Changes

  • Automatically extract new version from GIT tag

Fixes

  • Avoid trying to delete inactive VIFs. Fixing an annoying bogus error: "Failed deleting VIF for iface lo: Resource temporarily unavailable"
  • Fix #171: too small string buffer for IPv6 address causing garbled output in periodic expiry callback
  • Fix too small buffer for IPv6 address in mroute display functions

v2.5.3 - 2021-09-23

Changes

  • New tests to verify add/del of IPv4/IPv6 routes in kernel MFC

Fixes

  • Fix #166: build warning with gcc 10.2.1: "comparison is always true due to limited range of data type"
  • Fix build warning with --disable-mrdisc configure option
  • Fix #167: cannot remove routes added with smcroutectl add, only affects add/del at runtime with smcroutectl, not .conf reload
  • Fix #168: build problem on Debian/kFreeBSD, used wrong queue.h

v2.5.2 - 2021-08-27

Changes

  • Allow installing routes with no outbound interfaces
  • Reinitialize VIFs on reload in case of new interfaces
  • Handle cases when interfaces change ifindex, i.e. they've first been removed and then re-added with the same name

Fixes

  • Fix VIF leak when deleting interfaces with MRDISC enabled
  • Fix handling when an (S,G) moves to another IIF. This fixes issues where the SMCRoute kernel cache was out of sync with the kernel MFC
  • Fix handling of lost/disabled interfaces at reload. This fixes a couple of issues where routes were not updated properly at runtime
  • Update interface flags on reload, this fixes issues when SMCRoute failed to detect interfaces that had their MULTICAST flag set or cleared at runtime . Skip setsockopt() for IPC sockets. This fixes warnings in syslog about failing to disable MULTICAST_LOOP and MULTICAST_ALL

v2.5.1 - 2021-08-22

Changes

  • Add .sha256 checksum to dist files, useful for packagers

Fixes

  • Fix #155: systemd Notify integration, restore NotifyAccess=main
  • Fix #165: ftbfs on older compilers, e.g. gcc 4.8.3, use -std=gnu99
  • Fix Documentation refs in systemd unit file, new man pages

v2.5.0 - 2021-08-19

Highlights: native /etc/smcroute.d/*.conf support and seamless update/removal of routes and groups by reloading .conf files or using smcroutectl.

Tested on Linux 5.11 and FreeBSD 12.2

Changes

  • Fully automated test suite with 15 tests covering many use cases
  • Support for /etc/smcroute.d/*.conf, issue #103
  • Support for applying changes to .conf files without disturbing established flows -- i.e., seamless addition or removal of outbound interfaces in existing rules, or add/remove routes, without ever affecting other routes, issue #103
  • Support for route replacement/update smcroutectl, issue #115
  • Full (*,G) wildcard route matching, for IPv4 and IPv6, issue #31
  • Variant wildcard route matching with source and group range matching. This may of course waste a lot of resources, so handle with care:
    • (*,G/LEN), issue #135 (IPv4), and issue #162 (IPv6)
    • (S/LEN,G), issue #81
    • (S/LEN,G/LEN)
  • Full SSM/ASM group join support, for both IPv4 and IPv6. Including joining group ranges from both smcroutectl and .conf, issue #118 Please note, no SSM support on FreeBSD, only Linux
  • New command line option, -F file.conf to verify file syntax, issue #100
  • The -I NAME command line option has changed to -i NAME, compat support for the previous option remains
  • The mrdisc flag to the phyint directive is now what solely controls the functionality per interface. Previously a mechanism to enable/disable the functionality (if enabled) if active routes were in place. However, this did not cover (*,G) routes so that has been removed to simplify and guarantee full function
  • Output format from smcroutectl has been extensively changed. E.g, new /LEN support means wider columns, but heading have also changed
  • The .tar.xz archive has been has been dropped as distribution format, keeping only tar.gz

Fixes

  • Fix #120: failed ASM/SSM IGMP join if interface has no address
  • Fix #130: dynamic IPv6 routes are not flushed (like IPv4 (*,G))
  • Fix #149: (*,G) cache timeout callback stops, or never starts
  • Fix #151: same log entries
  • Fix #156: smcruotectl show does not show IPv6 routes
  • Fix stochastic timer behavior, e.g. mrdisc announcements experienced interference with the (*,G) cache timer

v2.4.4 - 2019-02-11

Changes

  • Allow same outbound interface as inbound for routes, only warn user
  • systemd unit file hardening, recommended by Debian
  • Discontinued GPG signing, unused and signed with only one dev key

Fixes

  • Fix #104: IGMP header checksum missing from mrdisc frames
  • Fix #105: Unblock all matching, and currently blocked, (S,G) to a newly installed (*,G) route, only the first know was unblocked
  • Fix #106: Timer nanosecond bug causing loss of address refresh on DHCP interfaces. Interface monitoring feature introduced in v2.4.3
  • Fix #108: Calling init script with stop does not stop smcrouted
  • Fix #109: ifindex in UNIX/POSIX is an interger, not unsigned short

v2.4.3 - 2018-11-06

The Lyon release.

Changes

  • Add strlcat() replacement from OpenBSD, use instead of strcat()
  • smcrouted should never log to system console, proposed by Westermo

Fixes

  • smcrouted fails to join multicast groups on interfaces that do not yet have an IP address when smcrouted starts up, or when it receives SIGHUP, e.g. DHCP client interfaces. This patch release adds a timer refresh of interface addresses that retries multicast group joins until an address is set. This is similar to issue #55, but does not handle interfaces that do not exist yet
  • Make sure Linux alias interfaces (baseif:num) are registered as baseif. Westermo found that use of alias interfaces cause multiple VIFs to be registered for the same base interface causing multicast routes to use the wrong inbound or outbound VIF. Alias interfaces use the same underlying physical interface so only one VIF needed
  • Fix display of route counters and column alignment
  • Minor spelling fixes, found by Debian
  • Add missing status command to SysV init script, found by Debian
  • Simplify utimensat() replacement, AT_SYMLINK_NOFOLLOW unused

v2.4.2 - 2018-09-09

Changes

  • Add wrapper script smcroute for use with old style startup scripts
  • Add symlinks to man pages for smcrouted.8 and smcroutectl.8
  • Update SysV init script, daemon now called smcrouted

Fixes

  • Fix #96: A .conf line may be missing final newline, this is fine
  • Spellcheck smcroute.conf example
  • Fix Lintian warning (Debian) for unbreakable line in man page

v2.4.1 - 2018-06-16

Changes

  • Update and spellecheck documentation and example .conf file

Fixes

  • Fix #91: Allow re-configuration of unprivileged smcrouted.
    Courtesy of Marcel Patzlaff

v2.4.0 - 2018-02-11

Changes

  • Interface wildcard support, Linux iptables like syntax, eth+ matches eth0, eth1, eth32. It can be used where an interface name is used: phyint, mroute, mgroup, and even on the command line to smcroutectl. Contributed by Martin Buck
  • Disable IPv4 mrdisc by default, enable per phyint in the .conf file instead. When not started with smcrouted -N mrdisc would otherwise be enabled on all interfaces found at startup
  • Minor doc updates, e.g. clarify need for root or CAP_NET_ADMIN including some minor man page fixes

Fixes

  • Fix #75: Not possible to remove (*,G) routes using smcroutectl
  • Fix #76: When removing a kernel route, also remove from internal lists otherwise route is shown in smcroutectl show. Conversely, adding a route to internal list shall only be done after successful kernel add
  • Fix #77: Counter overflow due to wrong type used in smcroutectl show
  • Fix #78: Document interface wildcard feature
  • Fix #80: smcroutectl argument parser fixes by Pawel Rozlach
  • Fix #84: Check return value of sigaction()
  • Fix #85: Signal handling is async-signal-unsafe
  • Fix #86: Document how to use iptables on Linux to modify TTL
  • Fix #87: Possible buffer overrun in ipc_receive()
  • Fix #89: Adding similar (S,G) route should replace existing one if inbound interface differs

v2.3.1 - 2017-06-13

Bug fix release courtesy of the Westermo WeOS automated testing framework. Many thanks to Johan Askerin at Westermo for working on integrating SMCRoute v2.3 into WeOS v4.22!

Changes

  • Add utimensat() replacement for systems that don't have it
  • Ignore error messages from send() on interface link down

Fixes

  • Fix build error(s) on FreeBSD 9/9.3-RELEASE
  • Fix possible invalid interface name reference in new mrdisc support
  • Fix log macro bug in the .conf parser
  • Fix buggy interface and VIF re-initialization on SIGHUP

v2.3.0 - 2017-05-28

Changes

  • Support GROUP/LEN matching for IPv4 (*,G) routes
  • Support for IPv4 mrdisc, RFC4286
  • Support for multiple routing tables on Linux, -t ID
  • ssmgroup code folded into general code, now with optional source
  • Separation of daemon and client into smcrouted and smcroutectl
    • Complete new client user interface, smcroutectl
    • Support for disabling IPC and client, --disable-client
    • Support for disabling .conf file support, --disable-config
  • Show multicast routes and joined groups in client, including stats: smcroutectl show [groups|routes]
  • Support for -d SEC startup delay in smcrouted
  • Unknown (*,G) multicast now blocked by default
  • Flush timer, -c SEC, for (*,G) routes now enabled by default, 60 sec
  • Build ID removed from configure script
  • Massive code cleanup, refactor and separation into stand-alone modules
  • Default system paths are no longer taken from /usr/include/paths.h, instead the settings from configure --prefix are used
  • Use of libcap for privilige separation is now auto-detected

Fixes

  • Allow use of loopback interface for multicast routes
  • Fix IPv4-only build, by Martin Buck
  • Fix IPv4 network interface address identification, by Martin Buck
  • Support unlimited number of network interfaces, by Martin Buck

v2.2.2 - 2017-02-02

Changes

  • New client command, -F, for immediately flushing dynamically learned (*,G) routes from the cache.

Fixes

  • Fix issue #51: New cache flush timeout option causes endless select() loop. Reported by Ramon Fried, @mellowcandle

v2.2.1 - 2017-01-09

Changes

  • Add support for a new command line option, -c SEC, for timing out dynamically learned (*,G) routes. Issue #17

Fixes

  • Portability, replace use of non-std __progname with small function
  • Issue #49: systemd unit file missing -d to start daemon

v2.2.0 - 2016-12-03

Changes

  • Support for dropping root privileges after opening the multicast routing socket and creating the PID file
  • Support for Source Specific Multicast group subscription (only IPv4)
  • Support for systemd, service file included and installed by default

Fixes

  • Remove GNUisms to be able to build and run on Alpine Linux (musl libc)
  • Add OpenBSD queue.h for systems that do not have any *BSD sys/queue.h
  • Coding style cleanup and minor refactor

v2.1.1 - 2016-08-19

Changes

  • When SIGHUP is received SMCRoute now touches its PID file as an acknowledgement. This is used by some process supervision daemons, like Finit, on system configuration changes to detect when a daemon is done. The mtime is set using the utimensat() function to ensure nanosecond resolution.

Fixes

  • Fix issue #38: Minor memory leak at exit. The Valgrind tool warns that all memory is not freed when smcroute exits. On most modern UNIX systems, on platforms with MMU, this is not a problem, but on older systems, or uClinux, memory is not freed at program exit.
  • Fix issue #39: Removing wildcard route at runtime does not work if no kernel routes have been set.
  • Fix issue #44: IPv6 disabled by default, despite what configure says in its help text. Enabling it disables it ... fixed by enabling IPv6 by default.

v2.1.0 - 2016-02-17

Changes

  • Allow more interfaces to be used for multicast routing, in particular on Linux, where interfaces without an IP address can now be used! Making it possible to run SMCRoute on DHCP/PPP interaces, issue #13

  • Add support for TTL scoping on interfaces, very useful for filtering multicast without a firewall: phyint IFNAME ttl-threshold TTL

  • On Linux a socket filter now filters out ALL traffic on the helper sockets where SMCRoute does IGMP/MLD join/leave on multicast groups. This should eliminate the extra overhad required to, not only route streams, but also send a copy of each packet to SMCRoute.

  • Add support for limiting the amount of multicast interfaces (VIFs) SMCRoute creates at startup. Two options are now available, by default all multicast capable interfaces are given a VIF and the user can selectively disable them one by one. However, if the -N command line option is given SMCRoute does not enable any VIFs by default, the user must then selectively enable interface one by one. The syntax in the config file is:

      phyint IFNAME <enable|disable>

    Use enable per interface with -N option, or disable by default.

  • Make build ID optional. SMCRoute has always had the build date hard coded in the binary. This change makes this optional, and defaults to disabled, to facilitate reproducible builds. For more info, see https://wiki.debian.org/ReproducibleBuilds

  • Remove generated files from GIT. Files generated by GNU autotools are now only part of the distribution archive, not the GIT repository. Use ./autogen.sh to create the required files when using GIT.

  • Updated man page and example smcroute.conf with limitations on the amount of mgroup rules.

  • Add support for executing an external script on config reload and when installing a multicast route. Issue #14

      smcroute -e /path/to/cmd

    The script is called when SMCRoute has started up, or has received SIGHUP and just reloaded the configuration file, and when a new source-less rule have been installed. See the documentation for more information on set environment variables etc. Issue #14

  • Add --disable-ipv6 option to configure script. Disables IPv6 support in SMCRoute even though the kernel may support it

  • Replaced -D option with -L LVL to alter log level, issue #24

  • The smcroute daemon now behaves more like a regular UNIX daemon. It defaults to using syslog when running in the background and stderr when running in the foreground. A new option -s can be used to enable syslog when running in the foreground, issue #25

  • The smcroute client no longer use syslog, only stderr, issue #25

  • When starting the smcroute daemon it is no longer possible to also send client commands on the same command line.

  • Remove the (unmaintained) in-tree mcsender tool. Both ping(8) and iperf(1) can be used in its stead. The omping(8) tool is another tool, engineered specifically for testing multicast. Issue #30

Fixes

  • Fix issue #10: smcroute client loops forever on command if no smcroute daemon is running
  • Install binaries to /usr/sbin rather than /usr/bin, regression introduced in v2.0.0. Fixed by Micha Lenk
  • Cleanup fix for no-MMU systems. Multicast groups were not properly cleaned up in the atexit() handler -- only affects no-MMU systems.
  • Do not force automake v1.11, only require at least v.11
  • SMCRoute operates fine without a config file, so use a less obtrusive warning message for missing /etc/smcroute.conf

v2.0.0 - 2014-09-30

Changes

  • Migrate to full GNU Configure and Build system, add Makefile.am, GitHub issue #6 -- heads up, packagers!
  • Add standard SysV init script, from Debian. GitHub issue #9

Fixes

  • Multiple fixes of nasty bugs thanks to Coverity static code analysis!
  • Cleanup of Linux system anachronisms to make FreeBSD work again, GitHub issue #5

v1.99.2 - 2013-07-16

Fixes

  • Fix issue #2: Loop forever bug when deleting new (*,G) sourceless routes Bug report and patch by Jean-Baptiste Maillet

v1.99.1 - 2013-07-11

Fixes

  • Fix possible memory leak on Linux
  • Fix missing #ifdefs when building on systems w/o IPv6
  • Fix possible race in Makefile when building in (massive) parallel
  • Fix build problems on RedHat EL5/CentOS5, i.e., Linux <= 2.6.25

v1.99.0 - 2012-05-13

Changes

  • Feature: Experimental source-less (*,G) IPv4 multicast routing. Most UNIX kernels are (S,G) based, i.e., you need to supply the source address with the multicast group to setup a kernel routing rule. However, daemons like mrouted and pimd emulate (*,G) by listening for IGMPMSG_NOCACHE messages from the kernel. SMCRoute now also implements this, for IPv4 only atm, by placing all (*,G) routes in a list and adding matching (S,G) routes on-demand at runtime. All routes matching this (,G) are removed when reloading the conf file on SIGHUP or when the user sends an IPC (-r) command to remove the (,G) rule.

Fixes

  • Bugfix: SMCRoute segfaults when starting on interface that is up but has no valid IPv4 address yet. Bug introduced in 1.98.3
  • Improved error messages including some minor cleanup and readability improvements
  • Bugfix: Actually check if running as root at startup

v1.98.3 - 2011-11-05

Changes

  • Check for existence of asprintf() to pidfile() and add -D_GNU_SOURCE to CPPFLAGS using AC_GNU_SOURCE in configure.ac
  • Cleanup IPv6 #ifdefs and replace IN6_MULTICAST() with standard IN6_IS_ADDR_MULTICAST(). This commit cleans up a lot of the IPv6 related #ifdefs, some minor function name refactoring and squash of some _init and _enable funcs into one for clarity and clearer error messages to the user

Fixes

  • Fixes FTBFS when host lacks IPv6 support.

v1.98.1 - 2011-11-05

Fixes

  • Bugfix: Client failed to send commands to daemon.
  • Bugfix: Several FTBFS fixed for GCC 4.6.x and -W -Wall

v1.98.0 - 2011-11-04

SMCRoute2 Announced!

Changes

  • Feature: Support for smcroute.conf configuration file for daemon. Add support for reading multicast routes and multicast groups from a configuration file.

      mgroup from IFNAME group MCGROUP
  mroute from IFNAME source ADDRESS group MCGROUP to IFNAME [IFNAME ...]

    Both IPv4 and IPv6 address formats are supported

  • Feature: Support for signals, reload conf file on SIGHUP

  • Feature: Add -n switch to support running smcroute in foreground.

  • Refactor: Insecure handling of pointers potentially outside array boundaries.

  • Refactor: Major cleanup, reindent to Linux C-style, for improved maintainability.

Fixes

  • Bugfix: Invalid use of varargs in call to snprintf(), use vsnprintf() instead
  • Bugfix: Invalid MRouterFD6 fd crashes smcroute, always check for valid fd
  • Bugfix: Several minor bugfixes; type mismatches and unused return values

v0.95 - 2011-08-08

Changes

v0.94.1 - 2010-01-13

Fixes

  • Bugfix: In case the kernel refuses write access to the file /proc/sys/net/ipv6/conf/all/mc_forwarding, don't let smcroute exit with an error, but proceed with normal operation without writing a "1" to this file. Apparently newer Linux kernels take care for the correct content of this file automatically whenever the IPv6 multicast routing API is initialized by a process.

v0.94 - 2009-11-01

Changes

  • Added support for IPv6 multicast routing in smcroute. SMCRoute now supports addition and removal of IPv6 multicast routes. It will automatically detect which type of route to add or delete based on the type (IPv4/IPv6) of addresses provided for the add and remove commands.
  • Added support for joins and leaves ('j'/'l') to IPv6 multicast groups.
  • Added support for sending to IPv6 multicast addresses to mcsender tool.
  • Added command line option to mcsender tool to allow user to specify the outgoing interface for datagrams sent.
  • Added autoconf support for smcroute build.

v0.93 - UNRELEASED

Fixes

  • Fixed the "smcroute looses output interfaces" bug. Carsten Schill, 0.93 unreleased

v0.92 - July 2002

Changes

  • Increased the number of supported interfaces The 16 interface limit of version 0.90 (interfaces as listed with ifconfig) was to small, especially when alias interfaces where defined.
    • up to 40 interfaces are no recognized by smcroute
    • this does not change the number of 'virtual interfaces' supported by the kernel (32)
    • not all interfaces recognized by smcroute (40) results in a 'virtual interface' of the kernel (32)

Fixes

  • Fixed the 'mroute: pending queue full, dropping entries' error Smcroute 0.90 didn't care about the IGMP messages delivered to the UDP socket that establish the MC-Router API. After some time the queue for the sockets filled up and the 'pending queue full' message was send from the kernel. To my knowledge this didn't affect smcroute or the operating system.
    • version 0.92 reads the ICMP messages now from the UDP socket and logs them to syslog with daemon/debug
    • smcroute does no further processing of this messages

v0.9 - September 2001

Changes

  • Added MC group join (-j) and leave (-l) functionality
    • the options enable/disable the sending of IGMP join messages for a multicast group on a specific interface
  • Removed the ' [] ...' for the '-r' option
    • they are not used by the kernel to identify the route to remove
    • smcroute will not complain about extra arguments for the '-r' option to stay compatible with releases <= 0.80
  • Improved error handling for some typical error situations
  • Added a test script (tst-smcroute.pl)
  • Added a man page

Fixes

  • Fixed some minor bugs

v0.8 - August 2001

Initial public release by Carsten Schill.