Paul Lockaby reported that since 1.8, disable-on-404 doesn't work
anymore in that the server stay up despite returning 404. Cyril spotted
that this was caused by a copy-paste error introduced by commit 5a13351
("BUG/MEDIUM: log: check result details truncated.") causing
set_server_running() to be called instead of set_server_stopping() in
this case.
It can be reproduced with the simple test config below :
defaults
mode http
timeout connect 1s
timeout client 10s
timeout server 10s
listen http
bind :8888
option httpchk GET /
http-check disable-on-404
server s1 127.0.0.1:9001 check
server s2 127.0.0.1:9002 check
http-response add-header x-served-by %s
listen s1
bind :9001
server next 127.0.0.1:9002
http-response set-status 404
frontend s2
bind :9002
http-request redirect location /
S1 is supposed to be stopping and s2 up, which is not the case. After
calling the correct function, only S2 is used now.
This needs to be backported to 1.8.
Since commit f9ce57e ("MEDIUM: connection: make conn_sock_shutw() aware
of lingering"), we refrain from performing the shutw() on the socket if
there is no lingering risk. But there is a problem with this in tunnel
and in TCP modes where a client is explicitly allowed to send a shutw
to the server, eventhough it it risky.
Not doing it creates this situation reported by Ricardo Fraile and
diagnosed by Christopher : a typical HTTP client (eg: curl) connecting
via the config below to an HTTP server would receive its response,
immediately close while the server remains in keep-alive mode. The
shutr() received by haproxy from the client is "propagated" to the
server side but not acted upon because fdtab[fd].linger_risk is set,
so we expect that the next close will immediately complete this
operation.
listen proxy-tcp
bind 127.0.0.1:8888
mode tcp
timeout connect 5s
timeout server 10s
timeout client 10s
server server1 127.0.0.1:8000
But since the whole stream will not end until the server closes in
turn, the server doesn't close and haproxy expires on server timeout.
This problem has already struck by waking up an older bug and was
partially fixed with commit 8059351 ("BUG/MEDIUM: http: don't disable
lingering on requests with tunnelled responses") though it was not
enough.
The problem is that linger_risk is not suited here. In fact we need to
know whether or not it is desired to close normally or silently, and
whether or not a shutr() has already been received on this connection.
This is the approach this patch takes, and it solves the problem for
the various difficult modes (tcp, http-server-close, pretend-keepalive).
This fix needs to be backported to 1.8. Many thanks to Ricardo for
providing very detailed traces and configurations.
If the server mentions no-cache="set-cookie" in the response headers,
we must guarantee that any set-cookie field will not be stored. We
cannot edit the stored response on the fly to trim the set-cookie
header so we can refrain from storing a response containing such a
header. In theory we could use TX_SCK_PRESENT for this but this one
is only set when the cookie is being watched by the configuration.
Since these responses are not very frequent and often accompanied
with a set-cookie header, let's simply refrain from caching whenever
such directive is present.
This needs to be backported to 1.8.
Till now if a client emitted a request featureing a cache-control header,
this one was not respected and a stale object could still be delievered.r
This patch ensures that :
- cache-control: no-cache disables retrieval from the cache but does
not prevent the newly fetched object from being stored ;
- cache-control: no-store can safely retrieve from the cache but prevents
from storing any fetched object
- cache-control: max-age/max-stale/min-fresh act like no-cache
- pragma: no-cache acts like cache-control: no-cache.
This needs to be backported to 1.8.
Currently the cache aborts a store operation if the object to store
already exists in the cache. This is used to avoid storing multiple
copies at the same time on concurrent accesses. It causes an issue
though, which is that existing unexpired objects cannot be updated.
This happens when any request criterion disables the retrieval from
the cache (eg: with max-age or any other cache-control condition).
For now, let's simply replace the previous existing entry by unlinking
it from the index. This could possibly be improved in the future if
needed.
This fix needs to be backported to 1.8.
All HTTP/1.1 requests the Host header share the same hash key 0 and
will be return the first cached object. Let's add the check on the call
to sha1_hosturi() to prevent this from happening.
This must be backported to 1.8.
The new function check_request_for_cacheability() is used to check if
a request may be served from the cache, and/or allows the response to
be stored into the cache. For this it checks the cache-control and
pragma header fields, and adjusts the existing TX_CACHEABLE and a new
TX_CACHE_IGNORE flags.
For now, just like its response side counterpart, it only checks the
first value of the header field. These functions should be reworked to
improve their parsers and validate all elements.
The cache used to set this flag before calling
check_response_for_cacheability() due to the way the flags were previously
set (too late), but this is a bad idea as it loses the information of the
implicit caching rules related to the method and the status code. Let's
only rely on what was determined during the request and response parsing
instead and not change it.
This fix must be backported to 1.8, and it requires that the following
patches are also merged :
- MINOR: http: adjust the list of supposedly cacheable methods
- MINOR: http: update the list of cacheable status codes as per RFC7231
- MINOR: http: start to compute the transaction's cacheability from the request
- BUG/MINOR: http: do not ignore cache-control: public
In 1.3.8, commit a15645d ("[MAJOR] completed the HTTP response processing.")
improved the response parser by taking care of the cache-control header
field. The parser is wrong because it is split in two parts, one checking
for elements containing an equal sign and the other one for those without.
The "max-age=0" and "s-maxage=0" tests were located at the wrong place and
thus have never matched. In practice the side effect was very minimal given
that this code used to be enabled only when checking if a cookie had the
risk of being cached or not. Recently in 1.8 it was also used to decide if
the response could be cached but in practice the cache takes care of these
values by itself so there is very limited impact.
This fix can be backported to all stable versions.
In check_response_for_cacheability(), we don't check the
cache-control flags if the response is already supposed not to be
cacheable. This was introduced very early when cache-control:public
was not checked, and it basically results in this last one not being
able to properly mark the response as cacheable if it uses a status
code which is non-cacheable by default. Till now the impact is very
limited as it doesn't check that cookies set on non-default status
codes are not cacheable, and it prevents the cache from caching such
responses.
Let's fix this by doing two things :
- remove the test for !TX_CACHEABLE in the aforementionned function
- however take care of 1xx status codes here (which used to be
implicitly dealt with by the test above) and remove the explicit
check for 101 in the caller
This fix must be backported to 1.8.
There has always been something odd with the way the cache-control flags
are checked. Since it was made for checking for the risk of leaking cookies
only, all the processing was done in the response. Because of this it is not
possible to reuse the transaction flags correctly for use with the cache.
This patch starts to change this by moving the method check in the request
so that we know very early whether the transaction is expected to be cacheable
and that this status evolves along with checked headers. For now it's not
enough to use from the cache yet but at least it makes the flag more
consistent along the transaction processing.
Since RFC2616, the following codes were added to the list of codes
cacheable by default : 204, 404, 405, 414, 501. For now this it only
checked by the checkcache option to detect cacheable cookies.
We used to have a rule inherited from RFC2616 saying that the POST
method was the only uncacheable one, but things have changed since
and RFC7231+7234 made it clear that in fact only GET/HEAD/OPTIONS/TRACE
are cacheable. Currently this rule is only used to detect cacheable
cookies.
When using an incorrect 'mode' as 2nd argument of core.register_service(),
HAProxy crashes while displaying the error message.
To be backported to 1.8, 1.7 and 1.6.
Setting a server in maint mode, the required next_state was not set
before calling the 'lb_down' function and so the system state was never
commited.
This patch should be backported in 1.8
The H2 mux can cleanly report an error when a client closes, which is not
the case for the pass-through mux which only reports shutr. That was the
reason why "option abortonclose" was created since there was no way to
distinguish a clean shutdown after sending the request from an abort.
The problem is that in case of H2, the streams are always shut read after
the request is complete (when the END_STREAM flag is received), and that
when this lands on a backend configured with "option abortonclose", this
aborts the request. Disabling abortonclose is not always an option when
H1 and H2 have to coexist.
This patch makes use of the newly introduced mux capabilities reported
via the stream interface's SI_FL_CLEAN_ABRT indicating that the mux is
safe and that there is no need to turn a clean shutread into an abort.
This way abortonclose has no effect on requests initiated from an H2
mux.
This patch as well as these 3 previous ones need to be backported to
1.8 :
- BUG/MINOR: h2: properly report a stream error on RST_STREAM
- MINOR: mux: add flags to describe a mux's capabilities
- MINOR: stream-int: set flag SI_FL_CLEAN_ABRT when mux supports clean aborts
By copying the info in the stream interface that the mux cleanly reports
aborts, we'll have the ability to check this flag wherever needed regardless
of the presence of a mux or not.
This new field will be used to describe certain properties of some
muxes. For now we only add MX_FL_CLEAN_ABRT to indicate that a mux
is able to unambiguously report aborts using CS_FL_ERROR contrary
to others who may only report it via a read0. This will be used to
improve handling of the abortonclose option with H2. Other flags
may come later to report multiplexing capabilities or not, support
of client/server sides etc.
There were several unused variables in halog.c that each caused a
compiler warning [-Wunused-but-set-variable]. This patch simply
removes the declaration of said vairables and any instance where the
unused variable was assigned a value.
The declaration of main() in iprange.c did not specify a type, causing
a compiler warning [-Wimplicit-int]. This patch simply declares main()
to be type 'int' and calls exit(0) at the end of the function.
For security reasons, the spoe filter was only able to change values of
existing variables. In specific cases (ex : with LUA code), the name of
variables are unknown at the configuration parsing phase.
The force-set-var option can be enabled to register all variables.
It looks like two version of the protocol exist as reported by
Andreas Mahnke. This patch add support for both legacy and standard CIP
protocol according to NetScaler specifications.
Original informations about the client are stored in the CIP encapsulated
IP header, hence there is no need to consider original IP packet length
to determine if data are missing. Instead this change detect missing
data if the remaining buffer is large enough to contain a minimal IP and
TCP header and if the buffer has as much data as CIP is telling.
There is minimal gain in checking first the IP header length and then
the TCP header length since we always want to capture information about
both protocols.
IPv4 length calculation was incorrect since IPv4 ip_len actually defines
the total length of IPv4 header and following data.
Buffer line is manually incremented in order to progress in the trash
buffer but calculation are made omitting this manual offset.
This leads to random packets being rejected with the following error:
HTTP/1: Truncated NetScaler Client IP header received
Instead, once original IP header is found, use the IP header length
without considering the CIP encapsulation.
- Fix a couple typos
- Introduce a couple simple rewordings
- Eliminate > 80 column lines
Changes do not affect technical content and can be backported.
A log socket (UDP or UNIX) is opened by the master during its startup, when the
first log message is sent. So, to prevent FD leaks, we must ensure we correctly
close it during a reload. By setting FD_CLOEXEC bit on it, we are sure it will
be automatically closed it during a reload.
This patch must be backported in 1.8.
This converter was recently introduced by commit ed0d24e ("MINOR:
sample: add len converter").
As found by Cyril, it causes an issue in "http-request capture"
statements. The non-obvious problem is that an old syntax for sample
expressions and converters used to support a series of words, each
representing a converter. This used to be how the "stick" directives
were created initially. By having a converter called "len", a
statement such as "http-request capture foo len 10" considers "len"
as a converter and not as the capture length.
This obsolete syntax needs to be changed in 1.9 but it's too late
for other versions. It's worth noting that the same problem can
happen if converters are registered on the fly using Lua. Other
language keywords that currently have to be avoided in converters
include "id", "table", "if", "unless".
Randomly, haproxy could fail to start when a "http-request capture"
action is defined, without any change to the configuration. The issue
depends on the memory content, which may raise a fatal error like :
unable to find capture id 'xxxx' referenced by http-request capture
rule
Commit fd608dd2 already prevents the condition to happen, but this one
should be included for completeness and to reclect the code on the
response side.
The issue was introduced recently by commit 29730ba5 and should only be
backported to haproxy 1.8.
Adrian Williams reported that several balancing methods were broken and
sent all requests to one backend. This is a regression in haproxy 1.8 where
the server score was not correctly recalculated.
This fix must be backported to the 1.8 branch.
When an end of stream has been reported, we should not try to receive again
as the mux layer might not be prepared to this and could report unexpected
errors.
This is more of a strengthening measure that follows the introduction of
conn_stream that came in 1.8. It's desired to backport this into 1.8 though
it's uncertain at this time whether it may have caused real issues.
Commit 4974561 ("BUG/MEDIUM: h2: enforce the per-connection stream limit")
implemented a stream limit enforcement on the connection but it was not
correctly done as it would count streams still known by the connection,
which includes the lingering ones that are already marked close. We need
to count only the non-closed ones, which this patch does. The effect is
that some streams are rejected a bit before the limit.
This fix needs to be backported to 1.8.
The HTTP forwarding engine needs to disable lingering on requests in
case the connection to the server has to be suddenly closed due to
http-server-close being used, so that we don't accumulate lethal
TIME_WAIT sockets on the outgoing side. A problem happens when the
server doesn't advertise a response size, because the response
message quickly goes through the MSG_DONE and MSG_TUNNEL states,
and once the client has transferred all of its data, it turns to
MSG_DONE and immediately sets NOLINGER and closes before the server
has a chance to respond. The problem is that this destroys some of
the pending DATA being uploaded, the server doesn't receive all of
them, detects an error and closes.
This early NOLINGER is inappropriate in this situation because it
happens before the response is transmitted. This state transition
to MSG_TUNNEL doesn't happen when the response size is known since
we stay in MSG_DATA (and related states) during all the transfer.
Given that the issue is only related to connections not advertising
a response length and that by definition these connections cannot be
reused, there's no need for NOLINGER when the response's transfer
length is not known, which can be verified when entering the CLOSED
state. That's what this patch does.
This fix needs to be backported to 1.8 and very likely to 1.7 and
older as it affects the very rare case where a client immediately
closes after the last uploaded byte (typically a script). However
given that the risk of occurrence in HTTP/1 is extremely low, it is
probably wise to wait before backporting it before 1.8.
Tunnelled responses are those without a content-length nor a chunked
encoding. They are specially dealt with in the current code but the
behaviour is not correct. The fact that the chunk size is left to zero
with a state artificially set to CHUNK_SIZE validates the test on
whether or not to set the end of stream flag. Thus the first DATA
frame always carries the ES flag and subsequent ones remain blocked.
This patch fixes it in two ways :
- update h1m->curr_len to the size of the current buffer so that it
is properly subtracted later to find the real end ;
- don't set the state to CHUNK_SIZE when there's no content-length
and instead set it to CHUNK_SIZE only when there's chunking.
This fix needs to be backported to 1.8.
We used to switch the stream's state to HREM when seeing and ES bit on
the DATA frame before actually being able to process that frame, possibly
resulting in the DATA frame being processed after the stream was seen as
half-closed and possibly being rejected. The state must not change before
the frame is really processed.
Also fixes a harmless typo in the flag name which should have DATA and
not HEADERS in its name (but all values are equal).
Must be backported to 1.8.
Since last commit it's not required that the DATA frames are complete anymore
so better start with what we have. Only the HEADERS frame requires this. This
may be backported as part of the upload fixes.
We currently have a problem with DATA frames when they don't fit into
the destination buffer. While it was imagined that in theory this never
happens, in practice it does when "option http-buffer-request" is set,
because the headers don't leave the target buffer before trying to read
so if the frame is full, there's never enough room.
This fix consists in reading what can be read from the frame and advancing
the input buffer. Once the contents left are only the padding, the frame
is completely processed. This also solves another problem we had which is
that it was possible to fill a request buffer beyond its reserve because
the <count> argument was not respected in h2_rcv_buf(). Thus it's possible
that some POST requests sent at once with a headers+body filling exactly a
buffer could result in "400 bad req" when trying to add headers.
This fix must be backported to 1.8.
We'll try to process partial frames and for this we need to know the
padding length. The first step requires to extract it during the parsing
and store it in the demux context in the connection. Till now it was only
processed at once.
Even after previous commit ("BUG/MEDIUM: h2: work around a connection
API limitation") there is still a problem with some requests. Sometimes
when polling for more request data while some pending data lies in the
buffer, there's no way to enter h2_recv() because the FD is not marked
ready for reading.
We need to slightly change the approach and make h2_recv() only receive
from the buffer and h2_wake() always attempt to demux if the demux is not
blocked.
However, if the connection is already being polled for reading, it will
not wake up from polling. For this reason we need to cheat and also
pretend a request for sending data, which ensures that as soon as any
direction may move, we can continue to demux. This shows that in the
long term we probably need a better way to resume an interrupted
operation at the mux level.
With this fix, no more hangups happen during uploads. Note that this
time the setup required to provoke the hangups was a bit complex :
- client is "curl" running on local host, uploading 1.7 MB of
data via haproxy
- haproxy running on local host, forwarding to a remote server
through a 100 Mbps only switch
- timeouts disabled on haproxy
- remote server made of thttpd executing a cgi reading request data
through "dd bs=10" to slow down everything.
With such a setup, around 3-5% of the connections would hang up.
This fix needs to be backported to 1.8.
The connection API permits us to enable or disable receiving on a
connection. The underlying FD layer arranges this with the polling
and the fd cache. In practice, if receiving was allowed and an end
of buffer was reached, the FD is subscribed to the polling. If later
we want to process pending data from the buffer, we have to enable
receiving again, but since it's already enabled (in polled mode),
nothing happens and the pending data remain stuck until a new event
happens on the connection to wake the FD up. This is a limitation of
the internal connection API which is not very friendly to the new mux
architecture.
The visible effect is that certain uploads to slow servers experience
truncation on timeout on their last blocks because nothing new comes
from the connection to wake it up while it's being polled.
In order to work around this, there are two solutions :
- either cheat on the connection so that conn_update_xprt_polling()
always performs a call to fd_may_recv() after fd_want_recv(), that
we can trigger from the mux by always calling conn_xprt_stop_recv()
before conn_xprt_want_recv(), but that's a bit tricky and may have
side effects on other parts (eg: SSL)
- or we refrain from receiving in the mux as soon as we're busy on
anything else, regardless of whether or not some room is available
in the receive buffer.
This patch takes the second approach above. This way once we read some
data, as soon as we detect that we're stuck, we immediately stop receiving.
This ensures the event doesn't go into polled mode for this period and
that as soon as we're unstuck we can continue. In fact this guarantees
that we can only wait on one side of the mux for a given direction. A
future improvement of the connection layer should make it possible to
resume processing of an interrupted receive operation.
This fix must be backported to 1.8.
In order to allow demuxing when the dmux buffer is full, we need to
enable data receipt in multiple conditions. Since the conditions are a
bit complex, they have been delegated to a new function h2_recv_allowed()
which follows these rules :
- if an error or a shutdown was detected on the connection and the buffer
is empty, we must not attempt to receive
- if the demux buf failed to be allocated, we must not try to receive and
we know there is nothing pending
- if the buffer is not full, we may attempt to receive
- if no flag indicates a blocking condition, we may attempt to receive
- otherwise must may not attempt
No more truncated payloads are detected in tests anymore, which seems to
indicate that the issue was worked around. A better connection API will
have to be created for new versions to make this stuff simpler and more
intuitive.
This fix needs to be backported to 1.8 along with the rest of the patches
related to CS_FL_RCV_MORE.
If we can't demux pending data due to a stream buffer full condition, we
now set CS_FL_RCV_MORE on the conn_stream so that the stream layer knows
it must call back as soon as possible to restart demuxing. Without this,
some uploaded payloads are truncated if the server does not consume them
fast enough and buffers fill up.
Note that this is still not enough to solve the problem, some changes are
required on the recv() and update_poll() paths to allow to restart reading
even with a buffer full condition.
This patch must be backported to 1.8.
When a stream interface tries to read data from a mux using rcv_buf(),
sometimes it sees 0 as the return value and concludes that there's no
more data while there are, resulting in the connection being polled for
more data and no new attempt being made at reading these pending data.
Now it will automatically check for flag CS_FL_RCV_MORE to know if the
mux really did not have anything available or was not able to provide
these data by lack of room in the destination buffer, and will set
SI_FL_WAIT_ROOM accordingly. This will ensure that once current data
lying in the buffer are forwarded to the other side, reading chk_rcv()
will be called to re-enable reading.
It's important to note that in practice it will rely on the mux's
update_poll() function to re-enable reading and that where the calls
are placed in the stream interface, it's not possible to perform a
new synchronous rcv_buf() call. Thus a corner case remains where the
mux cannot receive due to a full buffer or any similar condition, but
needs to be able to wake itself up to deliver pending data. This is a
limitation of the current connection/conn_stream API which will likely
need a new event subscription to at least call ->wake() asynchronously
(eg: mux->{kick,restart,touch,update} ?).
For now the affected mux (h2 only) will have to take care of the extra
logic to carefully enable polling to restart processing incoming data.
This patch relies on previous one (MINOR: conn_stream: add new flag
CS_FL_RCV_MORE to indicate pending data) and both must be backported to
1.8.
Due to the nature of multiplexed protocols, it will often happen that
some operations are only performed on full frames, preventing any partial
operation from being performed. HTTP/2 is one such example. The current
MUX API causes a problem here because the rcv_buf() function has no way
to let the stream layer know that some data could not be read due to a
lack of room in the buffer, but that data are definitely present. The
problem with this is that the stream layer might not know it needs to
call the function again after it has made some room. And if the frame
in the buffer is not followed by any other, nothing will move anymore.
This patch introduces a new conn_stream flag CS_FL_RCV_MORE whose purpose
is to indicate on the stream that more data than what was received are
already available for reading as soon as more room will be available in
the buffer.
This patch doesn't make use of this flag yet, it only declares it. It is
expected that other similar flags may come in the future, such as reports
of pending end of stream, errors or any such event that might save the
caller from having to poll, or simply let it know that it can take some
actions after having processed data.
