Sin Yu's patch to permit to change the proxy from a regex was merged
with little changes :
- req_cap/rsp_cap are not reassigned to the new proxy, they stay
attached to the frontend
- the actions have been renamed "reqsetbe" and "reqisetbe" for
"set BackEnd".
- the buffer is not reset after the switch, instead, the headers are
parsed again by the backend
- in Sin's patch, it was theorically possible to switch multiple times,
but the switching track was lost, making it impossible to apply
server responsesin the reverse order. Now switching is limited to
1 action (separation between frontend and backend) but the filters
remain.
Now it will be extremely easy to add other switching conditions, such
as host matching, URI matching, etc...
There's still a hard work to be done on the logs and stats.
The nbconn attribute in the proxies was not relevant anymore because
a frontend A may use backend B and both of them must account for their
respective connections. For this reason, there now are two separate
counters for frontend and backend connections.
The stats page has been updated to reflect the backend, but a separate
line entry for the frontend with error counts would be good.
Note that as of now, beconn may be higher than maxconn, because maxconn
applies to the frontend, while beconn may be increased due to sessions
passed from another frontend.
There was a confusion about the way to find filters and backend
parameters from sessions. The chaining has been changed between
the session and the proxy.
Now, a session knows only two proxies : one frontend (->fe) and
one backend (->be). Each proxy has a link to the proxy providing
filters and to the proxy providing backend parameters (both self
by default).
The captures (cookies and headers) have been attached to the
frontend's filters for now.
The uri_auth and the statistics are attached to the backend's
filters so that the uri can depend on a hostname for instance.
A proxy will be able to borrow parameters from another one.
In particular, the filters will be inheritable from another
proxy, and the backend parameters too.
The check of uri_auth is now in a separate function which is
checked after every backend switch, so that it will be possible
to have an uri_auth for the frontend and another one for the
backend.
The req_cap, hdr_state, hdr_idx, auth_hdr and req_line have been moved
to a dedicated hreq structure in the session. It makes is easier to
add HTTP-specific fields such as SOR (start of request) and EOF (end
of headers).
It also made it possible to fix two bugs introduced by last commit :
- end of headers not correctly detected
- hdr_idx not freed upon one specific error during session creation
When the backend side will be reworked, it should rely on a similar
structure.
The new parser uses an FSM to strictly follow RFC2616.
Headers are indexed and parsed only once they're all available.
That way, complex regexes make more sense.
HTTP processing is now performed in several phases by calling
multiple functions, making the code cleaner and easier to read.
Note that req[i]pass does not work anymore because it would
require that we mark a header to be ignored. What is really
needed is to have the ability to add an exception to a matching
(match xx except yy).
Several bugs have been fixed in appsession during the conversion
to the new FSM (method length and recovery on malloc errors).
The code does build and work with the debug examples, but is
not usable yet to connect to anything as it does not forward
the requests yet.
This structure will consume 4 bytes per header to keep track of
headers within a request or a response without having to parse
the whole request for each regex. As it's not possible to allocate
only 4 bytes, we define a max number of HTTP headers. We set it
to (BUFSIZE+79)/80 so that 8kB buffers can contain 100 headers
(like Apache), resulting in 400 bytes dedicated to indexation,
or about 400/(2*8kB) ~= 2.4% of the memory usage.
The references to the proxy from the session have been turned into
Frontend (fe), Filters (fi) and Backend (be). This should ease the
migration to the L7 switching features. Next step will be to kill
the struct proxy and have 3 independant structs instead, each
referenced from entities called listener, frontend, filters and
backend.
SO_REUSEPORT does not exist on Linux but the checks are available in
the code. With a little patch, it's possible to implement the feature,
but the value of SO_REUSEPORT will still have to be known from userland.
This patch adds a workaround to this problem by figuring out the value
for the one used by SO_REUSEADDR.
Using the cttproxy kernel patch, it's possible to bind to any source
address. It is highly recommended to use the 03-natdel patch with the
other ones.
A new keyword appears as a complement to the "source" keyword : "usesrc".
The source address is mandatory and must be valid on the interface which
will see the packets. The "usesrc" option supports "client" (for full
client_ip:client_port spoofing), "client_ip" (for client_ip spoofing)
and any 'IP[:port]' combination to pretend to be another machine.
Right now, the source binding is missing from server health-checks if
set to another address. It must be implemented (think restricted firewalls).
The doc is still missing too.
Released 1.3.3 with the following changes :
- fix broken redispatch option in case the connection has already
been marked "in progress" (ie: nearly always).
- support regparm on x86 to speed up some often called functions
- removed a few useless calls to gettimeofday() in log functions.
- lots of 'const char*' cleanups
- turn every FD_* into functions which are faster on recent CPUs
- builds again on OpenBSD and Solaris
Linux and BSD know about u_int32_t, while Solaris knows about uint32_t.
This is getting boring and unsigned int perfectly fits the goal for the
moment. Further investigation will be performed anyway.
Some of the tv_* functions are called very often. Passing their
arguments as registers is quite faster. This can be disabled
by setting CONFIG_HAP_DISABLE_REGPARM.
As suggested by Markus Elfring, a few "const char *" have replaced
some "char *" declarations where a function is not expected to
modify a value. It does not change the code but it helps detecting
coding errors.
- started the changes towards I/O completion callbacks. stream_sock* have
replaced event_*.
- added the new "reqtarpit" and "reqitarpit" protection features
It is now possible to tarpit connections based on regex matches.
The tarpit timeout is equal to the contimeout. A 500 server error
response is faked, and the logs show the status flags as "PT" which
indicate the connection has been tarpitted.
The timeouts, expiration timers and results are now stored in the buffers.
The timers will have to change a bit to become more flexible, and when the
I/O completion functions will be written, the connect_complete() will have
to be extracted from the write() function.
Released 1.3.1 with the following changes from 1.2.15 :
- now, haproxy warns about missing timeout during startup to try to
eliminate all those buggy configurations.
- added "Content-Type: text/html" in responses wherever appropriate, as
suggested by Cameron Simpson.
- implemented "option ssl-hello-chk" to use SSLv3 CLIENT HELLO messages to
test server's health
- implemented "monitor-uri" so that haproxy can reply to a specific URI with
an "HTTP/1.0 200 OK" response. This is useful to validate multiple proxies
at once.
This makes it possible to relay SSL connections in pure TCP instances while
ensuring the remote end really receives our data eventhough intermediate
agents (firewalls, proxies, ...) might acknowledge the connection.
The files are now stored under :
- include/haproxy for the generic includes
- include/types.h for the structures needed within prototypes
- include/proto.h for function prototypes and inline functions
- src/*.c for the C files
Most include files are now covered by LGPL. A last move still needs
to be done to put inline functions under GPL and not LGPL.
Version has been set to 1.3.0 in the code but some control still
needs to be done before releasing.
It has been rewritten and now supports an initialization state. It now also
prevents from dumping stopped(disabled) listeners and it is possible to
specify a scope with a list of proxies that are allowed to be dumped from
the one being configured ('.' meaning "this one"). The 'stats' entry can
be configured from the 'defaults' instance and it is correctly flushed
from proxies which redefine it.
Right now it only validates the user/passwd according to a specified list,
and lets the user pass through the proxy if the authentication is OK, and
it refuses any invalid access with a 401 Unauthorized response.
* made epoll() support a compile-time option : ENABLE_EPOLL
* provided a very little libc replacement for a possibly missing epoll()
implementation which can be enabled by -DUSE_MY_EPOLL
* implemented the poll() poller, which can be enabled with -DENABLE_POLL.
The equivalent runtime argument becomes '-P'. A few tests show that it
performs like select() with many fds, but slightly slower (certainly
because of the higher amount of memory involved).
* separated the 3 polling methods and the tasks scheduler into 4 distinct
functions which makes the code a lot more modular.
* moved some event tables to private static declarations inside the poller
functions.
* the poller functions can now initialize themselves, run, and cleanup.
* changed the runtime argument to enable epoll() to '-E'.
* removed buggy epoll_ctl() code in the client_retnclose() function. This
function was never meant to remove anything.
* fixed a typo which caused glibc to yell about a double free on exit.
* removed error checking after epoll_ctl(DEL) because we can never know if
the fd is still active or already closed.
* added a few entries in the makefile
* merged Alexander Lazic's and Klaus Wagner's work on application
cookie-based persistence. Since this is the first merge, this version is
not intended for general use and reports are more than welcome. Some
documentation is really needed though.
