Changelog

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All notable changes to this project will be documented in this file. This project adheres to Semantic Versioning.

Unreleased

1.12.2 - 2025-05-01

Added

  • Allow for setting the software_name option to none, which configures eturnal to omit the SOFTWARE attribute from STUN/TURN responses.
  • Allow for setting the relay_ipv4_addr and/or relay_ipv6_addr options to none. The latter may be useful for disabling RFC 6156 support (e.g., in case the server's IPv6 setup isn't usable for some reason).

Changed

  • Binary release: Use new (GCC-14.2-based) version of build toolchain.
  • Binary release: Update Erlang/OTP from 27.1.2 to 27.3.3.
  • Binary release: Update OpenSSL from 3.4.0 to 3.5.0.
  • Docker: Switch base image to Wolfi OS, which uses glibc. The old musl-libc (Alpine) variants now have a -alpine suffix.
  • Windows: Add explicit IPv4 listeners to default configuration, as :: doesn't create dual-stack sockets on that platform.

1.12.1 - 2024-10-24

Added

  • Docker: Offer a container VARIANT which includes the acme.sh cert creation script. The variant has a tag suffix -acme or just acme as latest synonym and can be configured with environment variables.
  • Docker: Add Docker secrets support. Any environment variable with a __FILE suffix is treated as a Docker secret. (#64)

Changed

  • The eturnalctl status call now checks whether eturnal is actually ready to handle STURN/TURN clients (and prints a line to the standard output in that case). If this call is issued early during startup, it will block (up to 15 seconds) until eturnal is responsive. The old behavior was to (silently) return success as soon as the underlying VM is alive.
  • Binary release: Update Erlang/OTP from 26.0.2 to 27.1.2.
  • Binary release: Update Rebar3 from 3.22.1 to 3.24.0.
  • Binary release: Update OpenSSL from 3.1.3 to 3.4.0.

1.12.0 - 2023-09-28

Added

  • The new blacklist_clients and blacklist_peers options may be used to specify blocklists for TURN clients and TURN peers separately. The old blacklist option that affected both clients and peers has been deprecated. The same applies to the whitelist option, which has been deprecated in favor of the new whitelist_clients and whitelist_peers options. By default, the blacklist_peers option is set to a list of networks recommended to be blocked. The other three lists are empty by default.

Changed

  • Binary release: Update OpenSSL from 3.1.2 to 3.1.3.
  • Binary release: Update zlib from 1.2.13 to 1.3.
  • Binary release: Use new (GCC-13.2-based) version of build toolchain.

Fixed

  • Don't fail to ping the systemd watchdog under certain conditions.

Removed

  • Drop support for container image for architecture s390x. If you need it, please contact us.

1.11.1 - 2023-08-06

Fixed

  • Don't fail to build with SKIP_DEPS set to true.

1.11.0 - 2023-08-06

Added

  • Allow for specifying static credentials in the eturnal.yml configuration file. They can be used instead of (or in addition to) a shared secret.
  • Allow for overriding the build.config settings using environment variables (of the same name, but upper-case).
  • Docker: Container images can now be pulled from Docker Hub as well. The name is docker.io/eturnal/eturnal:latest. When pulling with Docker, docker.io may be omitted.
  • Provide a homebrew Formula for macOS.

Changed

  • The environment variable ETURNAL_ETC_PREFIX has been deprecated in favor of ETURNAL_ETC_DIR. If the former was used with previous releases, ETURNAL_ETC_DIR should now be set to $ETURNAL_ETC_PREFIX/etc.
  • mod_stats_prometheus: Fine tune bucket sizes for TURN sessions, e.g., drop the 1 KiB bucket, as the 4 KiB bucket size should be sufficient to identify "inactive" sessions. Also, slightly alter the other bucket sizes.
  • Binary release: Update Erlang/OTP from 25.0.3 to 26.0.2.
  • Binary release: Update Rebar3 from 3.19.0 to 3.22.1.
  • Binary release: Update OpenSSL from 1.1.1q to 3.1.2.
  • Binary release: Update zlib from 1.2.12 to 1.2.13.
  • Binary release: Build Erlang/OTP without Termcap support.
  • Docker: Always use the same Erlang/OTP version as the binary release.
  • Windows: Update Erlang/OTP to 26.x.

Fixed

  • Fix a small memory leak (about 200 bytes per TURN session).
  • Include the ssl library with non-distro builds, as it's required for enabling TLS for the mod_stats_prometheus endpoint.
  • Docker: Include libcap libraries into the image to enable binding to privileged ports (<1024) directly. Hint: Depending on the container runtime in use, if the docker run option --cap-drop=ALL is used, CAP_NET_BIND_SERVICE may be included again to make the container work (see examples).

1.10.1 - 2022-08-02

Added

  • Improve TCP/TLS performance if no traffic shaper is configured using the max_bps option.
  • mod_stats_prometheus: Add a counter for STUN/TURN protocol errors, bucketed by transport and error condition.
  • build.config: Add code_loading option to specify whether code is loaded statically during eturnal startup or dynamically on demand. The latter may be desirable for (distribution) builds that use separately packaged Erlang dependencies, as it avoids hard-coding dependency versions at build time.
  • Docker: Include STUN lookup at container start for an IPv6 address as well.
  • Docker: Allow to define a different external STUN service for IP address lookups by adding the container-image-specific environment variable STUN_SERVICE, defaulting to: STUN_SERVICE="stun.conversations.im 3478". This same variable may also be used to disable the STUN lookup by defining STUN_SERVICE=false.

Changed

  • build.config: Rename the eturnal_bin_prefix option to eturnal_prefix.
  • Binary release: Reduce code size by omitting an unused transitive dependency (which had slipped back into the previous release).

Removed

  • build.config: Remove the eturnal_etc_prefix option.

Fixed

  • Fix dynamic loading of mod_stats_prometheus dependencies (for distribution builds).
  • Docker: Keep list of installed packages, so that image scanners like Trivy can check the image for vulnerabilities.

1.10.0 - 2022-07-27

Added

  • Include mod_stats_prometheus, a module for exporting metrics to Prometheus.
  • Include an example configuration for logrotate.
  • Include an example OpenRC init (and configuration) file.

Changed

  • If an EPMD process was spawned during eturnal startup, stop it on shutdown, unless it's used by other Erlang nodes.

Fixed

  • Avoid permission issues in the case where eturnalctl was invoked by root from a directory the user running eturnal isn't permitted to change into.
  • Make sure eturnalctl daemon won't hang on the very first startup when using Erlang/OTP 23 or newer.

1.9.1 - 2022-07-17

Added

  • Allow for adding the special keywords default or recommended to the blacklist. The former expands to the addresses blocked by default, the latter includes the former and additionally expands to a number of networks recommended to be blocked.
  • Fall back to reading the relay port range boundaries from environment variables when relay_min_port and/or relay_max_port aren't specified.
  • Docker: Adjust image ENTRYPOINT to provide a way to autodetect (in most cases) the Docker host's IPv4 address during container startup within isolated network environments, without explicitly defining the IPv4 address (with an ENV variable or a configuration file).

Changed

  • If an EPMD process is spawned during eturnal startup, let it listen on localhost only (#9). (Note that our Linux packages and container images are configured to not start an EPMD process.)
  • Omit the code location from log messages, except when debug logging is enabled.
  • Apply other minor logging improvements.
  • Docker: Reduce image size. IMPORTANT: A custom eturnal.yml configuration file should be mounted to the default path /etc/eturnal.yml or to a custom path defined with ETURNAL_ETC_PREFIX, as mounting it to /opt/eturnal/etc/eturnal.yml will prevent the container to start up successfully.
  • Binary release: Update Erlang/OTP from 25.0.2 to 25.0.3.
  • Windows: Update to LibYAML 0.2.5.
  • Windows: Update to OpenSSL 3.0.5.

1.9.0 - 2022-07-07

Added

  • Publish Docker images and provide configuration examples for Docker/Kubernetes (many thanks to Saarko) (#20).
  • Fall back to reading the relay IP addresses from environment variables when relay_ipv4_address and/or relay_ipv6_address aren't specified (#24).

Changed

  • Binary release: Update Erlang/OTP from 24.3.4 to 25.0.2.
  • Binary release: Update Rebar3 from 3.18.0 to 3.19.0.
  • Binary release: Update OpenSSL from 1.1.1m to 1.1.1q.
  • Binary release: Update minimum glibc version from 2.17 to 2.19.
  • Binary release: Reduce code size by omitting an unused transitive dependency.

Fixed

  • Avoid crashes in the case where no secret is configured in the eturnal.yml file (#21).
  • Don't log misleading complaints about proxy_protocol option.
  • Gracefully handle errors while receiving UDP data (#23).
  • Restart listeners on failure.
  • Reduce log level for network issues that may occur during normal operation.
  • Windows: Support custom installation path (#22).

1.8.3 - 2022-05-12

Changed

  • Specifying an ip address for listen entries is no longer mandatory. The default value is now "::".
  • Make sure eturnal's log_dir is used for the additional log files created by eturnalctl daemon.
  • Keep TURN session IDs unique across eturnal restarts.
  • Binary release: Update Erlang/OTP from 24.2.2 to 24.3.4.
  • Binary release: Update OpenSSL from 1.1.1m to 1.1.1o.
  • Binary release: Update zlib from 1.2.11 to 1.2.12.
  • Binary release: Use new (GCC-11.2-based) version of build toolchain.
  • Binary release: Provide self-extracting installer for non-DEB/RPM systems.

Fixed

  • Windows: Don't fail to start up after reboot.

1.8.2 - 2022-03-02

Changed

  • Use a (pseudo)random secret by default.
  • Improve autodetection of relay IP addresses used by default if the relay_ipv4_addr and/or relay_ipv6_addr options aren't specified.
  • Binary release: Update Erlang/OTP from 24.2 to 24.2.2.

Fixed

  • Don't crash without explicit listen configuration. This bug was introduced with version 1.7.0.
  • Don't crash if the configuration file is empty (i.e., has no eturnal section).
  • Don't crash if TURN is enabled without a public IPv6 relay address being available.

1.8.1 - 2022-01-10

Fixed

  • Don't fail to handle the $user argument of the eturnalctl sessions and eturnalctl disconnect calls.

1.8.0 - 2022-01-10

Added

  • Allow for configuring TLS connection properties using the new tls_options, tls_ciphers, and tls_dh_file options (#6).
  • Allow for specifying a whitelist of IP addresses/subnets which will be accepted even if they would otherwise be rejected due to being matched by a blacklist (#12).
  • Don't close active TURN sessions when ephemeral credentials expire, by default. The new strict_expiry option allows for enabling the previous behavior.
  • Add eturnalctl disconnect $user command for closing any TURN session(s) of the specified $user name.
  • Let the eturnalctl sessions command accept an optional $user argument to list only the TURN session(s) of the specified $user name.
  • Support running eturnal without the Erlang Port Mapper Daemon (EPMD) by specifying the environment variable ERL_DIST_PORT (requires at least Erlang/OTP 23.1 and Rebar3 3.18.0).

Changed

  • Binary release: Run eturnal without EPMD (as described above).

Fixed

  • Don't log bogus error messages if no eturnal modules are enabled when using Erlang/OTP version 21.0, 21.1, or 21.2.
  • Binary release: Don't let Erlang/OTP link against libnsl.so.1, which is no longer shipped by default on RedHat-based distributions, and isn't actually needed (#19).

1.7.0 - 2021-12-15

Added

  • Introduce the listen option proxy_protocol for enabling HAproxy protocol (version 1 and 2) support (#18).

Changed

  • Binary release: Update Erlang/OTP from 24.1.7 to 24.2.
  • Binary release: Update OpenSSL from 1.1.1l to 1.1.1m.
  • Binary release: Link asn1 and crypto NIFs statically into BEAM.
  • Binary release: Reduce size by a few MiB by omitting a test suite file.
  • Binary release: Don't forget to strip ERTS binaries.

Fixed

  • Don't crash when multiple secrets are configured on Erlang/OTP 23 or later.

1.6.0 - 2021-12-04

Added

  • Add eturnalctl credentials and eturnalctl password commands for generating ephemeral TURN credentials.
  • Support the listen option transport: auto for accepting unencrypted TCP and TLS connections on the same port (thanks to Annika Hannig). Requires Erlang/OTP 23 or later.

Changed

  • Binary release: Update Erlang/OTP from 24.1.4 to 24.1.7.

1.5.0 - 2021-11-02

Added

  • Allow for specifying a list of shared secrets in order to facilitate key rollover (#16).
  • Improve UDP receive performance.
  • Reduce risk of UDP packet loss.

Changed

  • Binary release: Update Erlang/OTP from 24.1.2 to 24.1.4.

Fixed

  • Handle the case where a tls_crt_file but no tls_key_file is specified (by assuming the tls_crt_file includes both the certificate and the key).
  • Don't forget to check for new PEM files on reload if the configuration wasn't modified (#17).

1.4.6 - 2021-10-11

Changed

  • Don't abort (but log an appropriate warning) if TURN is enabled without a shared secret.
  • Drop the runtime dependency on the openssl command for generating self-signed certificates.
  • Binary release: Update Erlang/OTP from 23.2 to 24.1.2.
  • Binary release: Update OpenSSL from 1.1.1i to 1.1.1l.

Removed

  • Drop the mod_example module.

1.4.5 - 2021-01-28

Changed

  • Don't include timestamp when logging to the systemd journal.

Fixed

  • Let eturnalctl sessions cope with non-latin characters in user names.
  • Binary release: Let eturnalctl remote_console actually connect to the running eturnal instance.

1.4.4 - 2021-01-21

Changed

  • Reject Teredo and 6to4 peers unconditionally.
  • Reject 0.0.0.0/8 and ::/128 peers unconditionally.

Fixed

  • Never request certificates from TLS clients.

1.4.3 - 2020-12-16

Changed

  • Binary release: Update Erlang/OTP from 22.2 to 23.2.
  • Binary release: Update OpenSSL from 1.1.1g to 1.1.1i.

Fixed

  • Don't log stack traces if clients attempt authentication while TURN is disabled.

1.4.2 - 2020-11-04

Changed

  • Make sure the eturnal.yml file isn't installed world-readable, as it might contain the shared TURN secret (#10).

1.4.1 - 2020-09-09

Fixed

  • Fix systemd watchdog interval recalculation during configuration reloads.

1.4.0 - 2020-09-06

Added

  • Add mod_log_stun for logging STUN requests. Without this module, they will now only show up in the debug log output.
  • Add list of TURN permissions to the eturnalctl sessions output.

Changed

  • Always log reason for TCP/TLS connection termination (at info level).
  • Omit Erlang process ID from log messages (now that a session ID is logged).

Fixed

  • Make the eturnalctl sessions command work with recent versions of the stun application.

1.3.0 - 2020-08-26

Added

  • Add eturnalctl info command, which prints some details regarding the running eturnal instance.
  • Add the TURN session duration to the eturnalctl sessions output.
  • Document the module API for developers.

Changed

  • Refactor the module API to avoid bottlenecks.

1.2.1 - 2020-08-16

Fixed

  • Strip the BEAM files shipped with the binary release. Due to a bug in the build tooling, this didn't happen for the previous release.

1.2.0 - 2020-08-16

Added

  • Add experimental support for modules and include a mod_example with the source code. The APIs aren't documented yet and may change in the future.
  • Include mod_stats_influx, a module for logging STUN/TURN events/statistics to InfluxDB (contributed by Marc Schink).

1.1.0 - 2020-07-22

Added

  • Add eturnalctl session command, which lists some details about the currently active TURN sessions.

Changed

  • Append session ID, transport, username, and client IP addresses/ports to STUN/TURN log messages.
  • Append relay/peer IP addresses/ports to TURN log messages.
  • Log amount of relayed traffic per TURN session.
  • Log plain STUN (Binding) responses.
  • Log more info level messages during TURN sessions.
  • Log error responses sent to STUN/TURN clients.

Fixed

  • Make configuration reloads performed after changing the listen configuration more robust against timing issues.
  • Let eturnalctl commands that query the running node fail gracefully if eturnal isn't running.

1.0.0 - 2020-07-13

Added

  • Allow for setting the log_dir option to the special value stdout, which tells eturnal to print log messages to the standard output rather than logging to a file.
  • Publish DEB and RPM packages, and adjust the documentation accordingly.

Changed

  • Allow for binding to privileged ports (if started via systemd).
  • Disable TURN support in the example configuration file.
  • If the distribution provides an epmd.service, make sure eturnal uses it rather than starting its own EPMD instance.
  • Don't bind EPMD to 127.0.0.1 by default.

Fixed

  • Only signal readiness to systemd if eturnal's startup actually was successful.

0.8.0 - 2020-07-08

Added

  • Support systemd's notify startup type.
  • Support systemd's service watchdog feature.

Changed

  • Remove max_allocations option from the documentation and from the example configuration. The stun application currently ignores this option, and it's not all that useful with ephemeral TURN credentials anyway.

Fixed

  • Don't ignore the log_level option when the configuration is reloaded.

0.7.0 - 2020-07-07

Added

  • Ship documentation and license with binary release archive.
  • Add reference documentation which can be built by calling rebar3 edoc within the source directory.
  • Allow for starting up eturnal without release boot file by calling a command such as erl -conf file '"/etc/eturnal.yml"' -s eturnal (assuming the BEAM files are in the code path).

Changed

  • Refuse TURN relaying from/to loopback addresses by default.

0.6.0 - 2020-07-02

Added

  • Include an example init script for non-systemd platforms.

Changed

  • Log more (and improved) info and debug level messages.
  • Allow for starting up eturnal without configured secret if TURN is disabled.

0.5.0 - 2020-06-30

Added

  • Let eturnalctl version print the version string of the running release.
  • Add an initial version of a test suite.

Changed

  • Allow non-root users to run the eturnalctl script if they have eturnal's Erlang cookie.
  • Make the release directory freely relocatable.

0.4.0 - 2020-06-28

Fixed

  • Fix TURN authentication on Erlang/OTP versions older than 22.1.

0.3.0 - 2020-06-28

Changed

  • Change systemd service type in order to support systemd versions older than 240.

Fixed

  • Make sure the eturnalctl script can be invoked by the superuser.
  • Fix compatibility with Erlang/OTP 21.0, 21.1, and 21.2.

0.2.0 - 2020-06-25

Changed

  • Add Erlang process ID to log messages.

0.1.0 - 2020-06-24

Changed

  • Allow for configuring the same (port, transport) combination on different IP addresses.

Fixed

  • Fix parameter expansion in eturnalctl script which prevented eturnal from starting up.
  • In the README section that describes building from source, don't forget to mention that rebar3 needs to be made executable.

0.0.1 - 2020-06-23

Added

  • Initial (pre-)release of the eturnal STUN/TURN server.