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ChangeLog

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

v2.3.0

Changes

  • Support for GROUP/LEN for IPv4 (*,G) routes
  • Support for mrdisc, RFC4286
  • ssmgroup code folded into general code, now with optional source
  • Separation of daemon and client into smcrouted and smcroutectl
  • Complete new user interface to smcroutectl
  • List multicast routes and joined groups in client, including stats
  • Support for -t 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
  • Possible to build smcrouted without both .conf file support and smcroutectl, but not at the same time
  • Massive code cleanup, refactor and separation into stand-alone modules

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 .service 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.