[ejabberd] [ANN] ejabberd 17.03 beta

Jérôme Sautret jerome.sautret at process-one.net
Mon Feb 27 21:01:00 MSK 2017


New modular code, flexible core backend, dynamic configuration reload,
spam protection and routing API changes.

These are the most interesting improvements coming in 17.03 and we are
very happy to share a first snapshot as a beta version.

As usual, we also included several other improvements and many
bug-fixes. In summary, almost 3K new lines of code and other 10K changed
lines.

## Improvements

### Modular code

New modular code allows to develop modules for a wide scope of
functionalities without patching the core code such as C2S, S2S and
router.

### Routing API

Now 'From' and 'To' arguments must be omitted in functions and
structures related to routing.
The commit deprecates the following functions:

- ejabberd_router:route/3 in favor of ejabberd_router:route/1
- ejabberd_router:route_error/4 in favor of  ejabberd_router:route_error/2
- ejabberd_local:route_iq/4 in favor of ejabberd_local:route_iq/2
- ejabberd_local:route_iq/5 in favor of ejabberd_local:route_iq/3

The format of {route, From, To, Packet} is changed in favor
of {route, Packet}.
API changes will be better described with 17.03 release when new API
documentation will be completed.

### Flexible core backend

Ejabberd used to store all in-memory shared data such as ACLs, proxy65,
sessions, routes, clustering, etc in internal Mnesia database and this
used to be hardcoded. With new API it's now possible to store such data
in any database.
However, currently only Mnesia backend is supported, but we're working
on implementing other backends (redis, sql) in future releases.
For the record, it's already possible to store client sessions in Redis
and/or SQL servers, the API was just extended to make it possible to
implement such a backend for any in-memory shared data.

## New features

### Dynamic configuration reload

Using 'reload_config' ejabberd's command it is now possible to reload
modules, database connections, ACLs and global options without
restarting ejabberd. Ability to reload other core components (listeners,
loglevel, etc) will be added in 17.03 release.
Thanks to this improvement, it's now possible to add and remove virtual
hosts via configuration reload.

### Spam protection

If you want to get ride of XMPP SPAM, best option is now to use our new
feature implemented by mod_block_strangers. This module just allow to
block packets from non-subscribers, this means you won't receive
messages from users not registered in your roster.

### S2S dialback

S2S dialback is now an optional module. If not present in the
configuration, only TLS mechanism can be used to establish S2S
connections.
<!--more-->

## Upgrade

While upgrading an existing system, you need to care about few required
changes. In order to enable S2S dialback, stream management (XEP-0178),
legacy client auth or the new anti-spam feature, the following modules
should be added to ejabberd's configuration:

- mod_s2s_dialback
- mod_stream_mgmt
- mod_legacy_auth
- mod_block_strangers

If you have issues using PubSub with Postgres backend, please check the
full schema update from sources.
While in runtime, you can run the following bare minimal changes to fix
PubSub

ALTER TABLE pubsub_state ALTER COLUMN subscriptions SET DEFAULT
'';
UPDATE pubsub_state SET subscriptions='' WHERE
subscriptions=null;

<!--more-->

## Changes

Here are the most relevant changes

### Developer

- tools/hook_deps.sh: checks hook dependencies
- tools/find-outdated-deps.pl: checks which dependences need update
- Mark as deprecated add/get_local/global_option config functions
- Change routing API

### Core

- Fix some corner cases while re-reading RFC6120
- Attach IP metadata to every stanza received from stream
- Apply SASLprep before storing/converting passwords
- Send compressed in correct order
- Reset XML stream before sending SASL success
- Speedup features list when a lot of virtual hosts configured
- Fix s2s_dns_timeout issues
- Better handling of IPv6 domains
- Rename mod_sm -> mod_stream_mgmt
- Don't count resent stanzas

### Admin

- Add 'supervisor' listening option
- Accept "add_commands: admin" in commands section
- Make sure that api_permissions always have "console commands" section
- Change name of pam dep from p1_pam to epam
- Improve compilation with rebar3
- Add TLS support for external components
- Specify "ExecReload" command in systemd unit
- Don't attempt to resolve _jabber._tcp SRV record
- Improve error reporting for forbidden servers
- mod_block_strangers: New module to block packets from non-subscribers
- mod_register: Report password change in the log
- Remove relict mod_service_log
- Remove unused mod_ip_blacklist
- Remove ejabberd_frontend_socket

### API & Commands

- get_last now always returns tuple with UTC XEP-0082 and status
- Protect users from delete_old_users command using a fixed access rule
- Separate list of strings with \n for srg_get_info in mod_http_api
- Support non-JID lines in command create_rooms_file
- stop_all_connections now stops all s2s connections via supervisor
  calls
- Support scrammed passwords in ejabberdctl import_prosody

### Config reload improvements

- Start/stop auth modules when host is added/deleted
- Improve modules start/stop procedures
- Check result of gen_mod:start/2 callback
- Improve reload_config admin command
- Start/stop virtual hosts when reloading configuration file
- Reload modules when reloading configuration file
- Make sure all hooks are called with proper host

### Databases

- Add missing NOT NULL restrictions in schemas
- Move archive tables into lite.sql for better comparison with other
  schemas
- Implement database backend interface for mod_proxy65
- Implement database backend interface for MUC, BOSH and auth_anonyous
- Implement database backend interface for ejabberd_router

### New XMPP stream behavior

- Reflect cyrsasl API changes in remaining code
- Improve return values in cyrsasl API
- More refactoring on session management
- Add xmpp_stream_out behavior and rewrite s2s/SM code
- Rewrite ejabberd_service to use new XMPP stream API

### MAM & offline storage

- Make a message is not bounced if it's archived
- Archive message before delivering it to offline storage
- Include stanza ID with archived offline messages
- Add stanza-id to every archived message

### PubSub

- Avoid orphan_item leak on affiliation/subscription removal
- Fix pubsub SQL schemas, add NOT NULL restrictions
- Fix last item cache for multiple hosts

## Feedback

As usual, the release is tagged in the Git source code repository on Github:
https://github.com/processone/ejabberd.git

The source package and binary installers are available at
https://www.process-one.net/en/ejabberd/downloads/

If you suspect that you've found a bug, please search or fill a bug
report on:
https://github.com/processone/ejabberd/issues


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