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Upgrade notes (seem like there are very few breaking changes):
https://www.unrealircd.org/docs/Upgrading_from_4.x
What's new in UnrealIRCd 5:
* Channel history. You can now see the last couple of lines that have
been said on channels when you JOIN. For this you need to set channel
mode +H, eg: eg: /MODE #chan +H 15:1440
* More IRCv3 features. Additional details are communicated to clients
which may help with displaying information. Implemented specs are:
account-tag, message-ids, time, echo-message, labeled-response and
BATCH.
* Ban exceptions (/ELINE). You can now exempt users dynamically on IRC
from *LINES, spamfilter, throttling, blacklist checking, connection
floods, bypassing antirandom, etc. Just type /ELINE on IRC to see
details.
* *LINES and Spamfilters are remembered: All of these are saved to a
file every few minutes and saved across reboots. This uses the new
tkldb module (loaded by default). No need for services for that
anymore.
* Persistent channels are remembered: For channels which have mode +P
set we now save all channel settings across reboots (topic, regular
modes and +beI lists). This via the channeldb module (loaded by
default).
* Anti connect-flood measures. In the last few 4.2.x versions we
introduced Connthrottle and reputation. In 5.x these modules are now
loaded by default for increased security.
* Easily restrict commands to fight drones. You can now disable any
command or impose restrictions, such as: command can only be executed
after being connected for XX seconds, or if you are identified to
services, etc. See the example for how to restrict LIST, INVITE and
messaging.
* Module manager for managing 3rd party modules easily. Install and
update modules with a single command.
* Condition configuration. You can have condition configuration where
you e.g. @define $IP "203.0.113.1" and can use $IP everywhere in the
configuration file. Similarly, support for @if-blocks. This is
especially useful for advanced users who like to use the same
configuration file on multiple machines, usually with the help of
remote includes.
* Improved Channel Mode +L now kicks in for any rejected join, so not
just for +l but also for +b, +i, +O, +z, +R and +k. If, for example,
the channel is +L #insecure and also +z then, when an insecure user
ties to join they will be redirected to #insecure.
* Ban forwards. New extended ban ~f to forward users to the specified
channel if the ban matches. Example: MODE #chan +b
~f:#badisp:*!*@*.isp.org
* Improved WebSocket support. We already supported websockets, but now
we support websocket type 'text', which is compatible with web IRC
clients such as Kiwi IRC.
* Code cleanups. The biggest effort of all went into cleaning up old
code and making the code much more readable. This also means that
UnrealIRCd 5 will not be able to link with really older servers or
services, like UnrealIRCd 3.2.x.
* Windows version is 64-bits. This should allow for increased address
space and security. This also means UnrealIRCd 5 will not run on
32-bits Windows (should be rare nowadays, anyway)
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UnrealIRCd is an IRC server based on the branch of IRCu called
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Dreamforge, formerly used by the DALnet IRC Network.
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Key features include SSL, cloaking, its advanced anti-flood and
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anti-spam systems, swear filtering and module support.
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