By appending "interface <name>" to a "bind" line, it is now possible
to specifically bind to a physical interface name. Note that this
currently only works on Linux and requires root privileges.
In order to achieve more generic accept() code, we can set the request
analysers at the listener registration time. It's better than doing it
during accept(), and allows more code reuse.
proto_http.c was not suitable for session-related processing, it was
just convenient for the tranformation.
Some more splitting must occur: process_request/response in proto_http.c
must be split again per protocol, and the caller must run a list.
Some functions should be directly attached to the session or the buffer
(eg: perform_http_redirect, return_srv_error, http_sess_log).
This is the first attempt at moving all internal parts from
using struct timeval to integer ticks. Those provides simpler
and faster code due to simplified operations, and this change
also saved about 64 bytes per session.
A new header file has been added : include/common/ticks.h.
It is possible that some functions should finally not be inlined
because they're used quite a lot (eg: tick_first, tick_add_ifset
and tick_is_expired). More measurements are required in order to
decide whether this is interesting or not.
Some function and variable names are still subject to change for
a better overall logics.
Using some Linux kernel patches, it is possible to redirect non-local
traffic to local sockets when IP forwarding is enabled. In order to
enable this option, we introduce the "transparent" option keyword on
the "bind" command line. It will make the socket reachable by remote
sources even if the destination address does not belong to the machine.
Add the "backlog" parameter to frontends, to give hints to
the system about the approximate listen backlog desired size.
In order to protect against SYN flood attacks, one solution is
to increase the system's SYN backlog size. Depending on the
system, sometimes it is just tunable via a system parameter,
sometimes it is not adjustable at all, and sometimes the system
relies on hints given by the application at the time of the
listen() syscall. By default, HAProxy passes the frontend's
maxconn value to the listen() syscall. On systems which can
make use of this value, it can sometimes be useful to be able
to specify a different value, hence this backlog parameter.
There was a missing state for listeners, when they are not listening
but still attached to the protocol. The LI_ASSIGNED state was added
for this purpose. This permitted to clean up the assignment/release
workflow quite a bit. Generic enable/enable_all/disable/disable_all
primitives were added, and a disable_all entry was added to the
struct protocol.
A new file, proto_uxst.c, implements support of PF_UNIX sockets
of type SOCK_STREAM. It relies on generic stream_sock_read/write
and uses its own accept primitive which also tries to be generic.
Right now it only implements an echo service in sight of a general
support for start dumping via unix socket. The echo code is more
of a proof of concept than useful code.
A new generic protocol mechanism has been added. It provides
an easy method to implement new protocols with different
listeners (eg: unix sockets).
The listeners are automatically started at the right moment
and enabled after the possible fork().
