Roman Arutyunyan [Wed, 29 Jan 2014 09:33:45 +0000 (13:33 +0400)]
Mp4: skip tracks shorter than seek position (ticket #414).
Mp4 module does not check movie and track durations when reading
file. Instead it generates errors when track metadata is shorter
than seek position. Now such tracks are skipped and movie duration
check is performed at file read stage.
Roman Arutyunyan [Wed, 29 Jan 2014 09:30:36 +0000 (13:30 +0400)]
Mp4: fix seeks after the last key frame.
Mp4 module does not allow seeks after the last key frame. Since
stss atom only contains key frames it's usually shorter than
other track atoms. That leads to stss seek error when seek
position is close to the end of file. The fix outputs empty
stss frame instead of generating error.
Maxim Dounin [Tue, 28 Jan 2014 11:40:46 +0000 (15:40 +0400)]
Fixed TCP_DEFER_ACCEPT handling (ticket #353).
Backed out 05a56ebb084a, as it turns out that kernel can return connections
without any delay if syncookies are used. This basically means we can't
assume anything about connections returned with deferred accept set.
To solve original problem the 05a56ebb084a tried to solve, i.e. to don't
wait longer than needed if a connection was accepted after deferred accept
timeout, this patch changes a timeout set with setsockopt(TCP_DEFER_ACCEPT)
to 1 second, unconditionally. This is believed to be enough for speed
improvements, and doesn't imply major changes to timeouts used.
Note that before 2.6.32 connections were dropped after a timeout. Though
it is believed that 1s is still appropriate for kernels before 2.6.32,
as previously tcp_synack_retries controlled the actual timeout and 1s results
in more than 1 minute actual timeout by default.
Maxim Dounin [Tue, 28 Jan 2014 11:40:45 +0000 (15:40 +0400)]
SSI: fixed $date_local and $date_gmt without SSI (ticket #230).
If there is no SSI context in a given request at a given time,
the $date_local and $date_gmt variables used "%s" format, instead
of "%A, %d-%b-%Y %H:%M:%S %Z" documented as the default and used
if there is SSI module context and timefmt wasn't modified using
the "config" SSI command.
While use of these variables outside of the SSI evaluation isn't strictly
valid, previous behaviour is certainly inconsistent, hence the fix.
Ruslan Ermilov [Mon, 27 Jan 2014 20:31:31 +0000 (00:31 +0400)]
Configure: enabled -Werror for clang.
Modern clang versions seem to no longer produce warnings for
system headers on Linux (at least clang 3.3 works), hence the
change. For older versions --with-cc-opt="-Wno-error" can be
used as a workaround.
Maxim Dounin [Thu, 23 Jan 2014 14:32:26 +0000 (18:32 +0400)]
SSL: fixed $ssl_session_id possible segfault after 97e3769637a7.
Even during execution of a request it is possible that there will be
no session available, notably in case of renegotiation. As a result
logging of $ssl_session_id in some cases caused NULL pointer dereference
after revision 97e3769637a7 (1.5.9). The check added returns an empty
string if there is no session available.
Maxim Dounin [Wed, 22 Jan 2014 12:05:07 +0000 (16:05 +0400)]
Upstream: reading from a client after connection upgrade.
Read event on a client connection might have been disabled during
previous processing, and we at least need to handle events. Calling
ngx_http_upstream_process_upgraded() is a simpliest way to do it.
Notably this change is needed for select, poll and /dev/poll event
methods.
Previous version of this patch was posted here:
http://mailman.nginx.org/pipermail/nginx/2014-January/041839.html
SPDY: use ngx_queue_t to queue streams for post processing.
It simplifies the code and allows easy reuse the same queue pointer to store
streams in various queues with different requirements. Future implementation
of SPDY/3.1 will take advantage of this quality.
SPDY: store the length of frame instead of its whole size.
The "length" value better corresponds with the specification and reduces
confusion about whether frame's header is included in "size" or not.
Also this change simplifies some parts of code, since in more cases the
length of frame is more useful than its actual size, especially considering
that the size of frame header is constant.
SPDY: use frame->next pointer to chain free frames.
There is no need in separate "free" pointer and like it is for ngx_chain_t
the "next" pointer can be used. But after this change successfully handled
frame should not be accessed, so the frame handling cycle was improved to
store pointer to the next frame before processing.
Also worth noting that initializing "free" pointer to NULL in the original
code was surplus.
SPDY: removed state to check first SETTINGS frame.
That code was based on misunderstanding of spdy specification about
configuration applicability in the SETTINGS frames. The original
interpretation was that configuration is assigned for the whole
SPDY connection, while it is only for the endpoint.
Moreover, the strange thing is that specification forbids multiple
entries in the SETTINGS frame with the same ID even if flags are
different. As a result, Chrome sends two SETTINGS frames: one with
its own configuration, and another one with configuration stored
for a server (when the FLAG_SETTINGS_PERSIST_VALUE flags were used
by the server).
To simplify implementation we refuse to use the persistent settings
feature and thereby avoid all the complexity related with its proper
support.
While processing a DATA frame, the link to related stream is stored in spdy
connection object as part of connection state. But this stream can be closed
between receiving parts of the frame.
Maxim Dounin [Fri, 17 Jan 2014 02:24:53 +0000 (06:24 +0400)]
Core: improved ngx_reset_pool() (ticket #490).
Previously pool->current wasn't moved back to pool, resulting in blocks
not used for further allocations if pool->current was already moved at the
time of ngx_reset_pool(). Additionally, to preserve logic of moving
pool->current, the p->d.failed counters are now properly cleared. While
here, pool->chain is also cleared.
This change is essentially a nop with current code, but generally improves
things.
SPDY: send output queue after processing of read event.
During the processing of input some control frames can be added to the queue.
And if there were no writing streams at the moment, these control frames might
be left unsent for a long time (or even forever).
This long delay is especially critical for PING replies since a client can
consider connection as broken and then resend exactly the same request over
a new connection, which is not safe in case of non-idempotent HTTP methods.
SPDY: the SETTINGS frame should be allocated from sc->pool.
There is no reason to allocate it from connection pool that more like just
a bug especially since ngx_http_spdy_settings_frame_handler() already uses
sc->pool to free a chain.
The frame->stream pointer should always be initialized for control frames since
the check against it can be performed in ngx_http_spdy_filter_cleanup().
SPDY: fixed off_t/size_t type conversions on 32 bits platforms.
Parameters of ngx_http_spdy_filter_get_shadow() are changed from size_t to off_t
since the last call of the function may get size and offset from the rest of a
file buffer. This fixes possible data loss rightfully complained by MSVC on 32
bits systems where off_t is 8 bytes long while size_t is only 4 bytes.
The other two type casts are needed just to suppress warnings about possible
data loss also complained by MSVC but false positive in these cases.
The "delayed" flag always should be set if there are unsent frames,
but this might not be the case if ngx_http_spdy_body_filter() was
called with NULL chain.
As a result, the "send_timeout" timer could be set on a stream in
ngx_http_writer(). And if the timeout occurred before all the stream
data has been sent, then the request was finalized with the "client
timed out" error.
SPDY: elimination of r->blocked counter usage for queuing frames.
It was used to prevent destroying of request object when there are unsent
frames in queue for the stream. Since it was incremented for each frame
and is only 8 bits long, so it was not very hard to overflow the counter.
Now the stream->queued counter is checked instead.
Dirkjan Bussink [Fri, 10 Jan 2014 15:12:40 +0000 (16:12 +0100)]
SSL: ssl_session_tickets directive.
This adds support so it's possible to explicitly disable SSL Session
Tickets. In order to have good Forward Secrecy support either the
session ticket key has to be reloaded by using nginx' binary upgrade
process or using an external key file and reloading the configuration.
This directive adds another possibility to have good support by
disabling session tickets altogether.
If session tickets are enabled and the process lives for a long a time,
an attacker can grab the session ticket from the process and use that to
decrypt any traffic that occured during the entire lifetime of the
process.
Maxim Dounin [Fri, 3 Jan 2014 23:32:22 +0000 (03:32 +0400)]
Fixed "zero size buf in output" alerts.
If a request had an empty request body (with Content-Length: 0), and there
were preread data available (e.g., due to a pipelined request in the buffer),
the "zero size buf in output" alert might be logged while proxying the
request to an upstream.
Similar alerts appeared with client_body_in_file_only if a request had an
empty request body.
Maxim Dounin [Fri, 3 Jan 2014 23:32:10 +0000 (03:32 +0400)]
Upstream: Cache-Control preferred over Expires.
Not really a strict check (as X-Accel-Expires might be ignored or
contain invalid value), but quite simple to implement and better
than what we have now.
Maxim Dounin [Fri, 3 Jan 2014 23:31:58 +0000 (03:31 +0400)]
Allowed up to two EBUSY errors from sendfile().
Fallback to synchronous sendfile() now only done on 3rd EBUSY without
any progress in a row. Not falling back is believed to be better
in case of occasional EBUSY, though protection is still needed to
make sure there will be no infinite loop.
Ruslan Ermilov [Fri, 27 Dec 2013 15:40:04 +0000 (19:40 +0400)]
Fixed setting of content type in some cases.
This fixes content type set in stub_status and autoindex responses
to be usable in content type checks made by filter modules, such
as charset and sub filters.
Processing events from upstream connection can result in sending queued frames
from other streams. In this case such streams were not added to handling queue
and properly handled.
A global per connection flag was replaced by a per stream flag that indicates
currently sending stream while all other streams can be added to handling
queue.
Upstream: simplified peer selection loop in the "ip_hash" module.
Conditions for skipping ineligible peers are rewritten to make adding of new
conditions simpler and be in line with the "round_robin" and "least_conn"
modules. No functional changes.
SPDY: drop the "delayed" flag when finalizing connection.
This flag in SPDY fake write events serves the same purposes as the "ready"
flag in real events, and it must be dropped if request needs to be handled.
Otherwise, it can prevent the request from finalization if ngx_http_writer()
was set, which results in a connection leak.
Evan Miller [Wed, 4 Dec 2013 22:45:44 +0000 (14:45 -0800)]
Contrib: add vim scripts to contrib/ directory.
I've been maintaining these scripts independently for a while now, even though
I'm no longer active in the community. Seems to me that contrib/ is a good
long-term home for the scripts.
Maxim Dounin [Fri, 29 Nov 2013 13:16:06 +0000 (17:16 +0400)]
SSL: fixed c->read->ready handling in ngx_ssl_recv().
If c->read->ready was reset, but later some data were read from a socket
buffer due to a call to ngx_ssl_recv(), the c->read->ready flag should
be restored if not all data were read from OpenSSL buffers (as kernel
won't notify us about the data anymore).
More details are available here:
http://mailman.nginx.org/pipermail/nginx/2013-November/041178.html
Maxim Dounin [Mon, 18 Nov 2013 16:48:22 +0000 (20:48 +0400)]
Upstream: cache revalidation with conditional requests.
The following new directives are introduced: proxy_cache_revalidate,
fastcgi_cache_revalidate, scgi_cache_revalidate, uwsgi_cache_revalidate.
Default is off. When set to on, they enable cache revalidation using
conditional requests with If-Modified-Since for expired cache items.
As of now, no attempts are made to merge headers given in a 304 response
during cache revalidation with headers previously stored in a cache item.
Headers in a 304 response are only used to calculate new validity time
of a cache item.
SPDY: fixed request hang with the auth request module.
We should just call post_handler() when subrequest wants to read body, like
it happens for HTTP since rev. f458156fd46a. An attempt to init request body
for subrequests results in hang if the body was not already read.