Thanks to Javor Kliachev for the bugreport.

Implemented eval command can be used to evaluate expressions.

The patch also documents echo command and allows to use log classes
instead of integer as a mask for echo.

Thanks to Fritz Grimpen for the patch.

When route was propagated to another rtable through a pipe and then the
pipe was reconfigured softly in such a way that any subsequent route
updates are filtered, then the source protocol shutdown didn't clean up
the route in the second rtable which caused stale routes and potential
crashes.

If TX buffers were full during BGP session shutdown
then a protocol waited indefinitely to be able to
send notification packet to close the session.

Inspired by the patch from Alexander V. Chernikov.

Interfaces for OSPF and RIP could be configured to use (and request)
TTL 255 for traffic to direct neighbors.

Thanks to Simon Dickhoven for the original patch for RIPng.

Implements support for IPv6 traffic class, sets higher priority for OSPF
and RIP outgoing packets by default and allows to configure ToS/DS/TClass
IP header field and the local priority of outgoing packets.

Temporary dummy routes created by a kernel protocol during routing table
scan get mixed with real routes propagated from another kernel protocol
through a pipe.

Also fixes OSPFv3 routing table calculcation w.r.t.
errata 2078 to RFC 5340.

Negative bit shifts are definitely undefined oprations.

Thanks to Fritz Grimpen for the bugfix.

Thanks to Peter Christensen for the bugfix.

The BIRD client code is restructured that most of the code (including
main function) is shared in client.c, while birdc.c and birdcl.c contain
just I/O-specific callbacks. This removes all duplicated code from
variant-specific files.

Renames some files:
birdc/client.c -> birdc.c
birdcl/client.c -> birdcl.c
client_common.c -> common.c

Adds two new default GCC options related to optimizations
(-fno-strict-aliasing and -fno-strict-overflow). This
should fix some hyperaggressive GCC optimizations.

Also updates autoconf option detection.

BIRD used zero netmask in hello packets on all PtP links, not just on
unnumbered ones. This patch fixes it and adds option 'ptp netmask'
for overriding the default behavior.

Thanks to Alexander V. Chernikov for the original patch.

Thanks to Alexander V. Chernikov for the patch.

BGP next hop attributes with empty link-local IPv6 addresses were not
handled properly.

Thanks to Sergey Popovich for the bugfix.

This option allows to keep the received next hop even in cases when
the route is sent to an interface with a different subnet.

Configured NBMA neighbors in OSPFv3 should be link-local addresses, old
behavior was to silently ignore global ones. The patch allows BIRD to
accept global ones, but adds a warning and a documentation notice.

Thanks to Wilco Baan Hofman for the bugreport.

Fix handling of async messafe in the bird light client. The async message
may occure at the any moment so we need the client to liste for the
message from server when it waits for user input.

Fix handling of questionmark handling in the bird light client. The
questionmark should display help when it is the last non-blank character on
command line. Otherwise the questionmark does not have any special meaning
and it could be a part of a pattern.

Restructure client/ subdir. Add two different flavors of client.
The full featured birdc client code is in client/birdc/.
The new light client birtcl is in client/birdcl/.
Common sources of both clients are directly in client/.

Rework on-line auto-completion in client/command.c to conditionally turn off
ncurses-specific code.

Add lightweight client without libreadline and ncurses dependencies - birdcl.
The birdcl lacks support of history, on-line auto-completion and there
are different implementations of "more" functionality and help on '?' press.
New client operates in canonical terminal mode (apart from "more" display)
and therefore all commands have to be executed by a return key including help
commands (called by '?' character in the end of the line).
Apart from these limitations the interaction style should be the same as
for the full client - birdc.
Build of birdcl is always on (independent on --enable-client parameter).

Pull out routines for interacting with the server and interpreting
internal commands which are not dependent on libreadline and
ncurses libraries.

This is a preparation step for a new lightweight birdc client.

Rename client/client.c to client-full.c and change the Makefile accordingly.
This is a preparation step for introducing a new lightweight client which
should reuse as much code as possible from the old one but it should not depend
on external libraries.

Signed-off-by: Tomas Hlavacek <tmshlvck@gmail.com>

Default rounting table for 'show route export/preexport/protocol' is the one related to a respective protocol.