BUG/MEDIUM: ssl: Fix a memory leak in DHE key exchange

OpenSSL does not free the DH * value returned by the callback specified with SSL_CTX_set_tmp_dh_callback(),
leading to a memory leak for SSL/TLS connections using Diffie Hellman Ephemeral key exchange.
This patch fixes the leak by allocating the DH * structs holding the DH parameters once, at configuration time.

Note: this fix must be backported to 1.5.
(cherry picked from commit 8de5415b85512da871d58d1e9a0a33bd67f3b570)
BUG/MINOR: http: base32+src should use the big endian version of base32

We're using the internal memory representation of base32 here, which is
wrong since these data might be exported to headers for logs or be used
to stick to a server and replicated to other peers. Let's convert base32
to big endian (network representation) when building the binary block.

This mistake is also present in 1.5, it would be better to backport it.
(cherry picked from commit 5ad6e1dc09f0a85aabf86f154b1817b9ebffb568)
BUG/MEDIUM: connection: fix memory corruption when building a proxy v2 header

Use temporary trash chunk, instead of global trash chunk in
make_proxy_line_v2() to avoid memory overwrite.

This fix must also be backported to 1.5.
(cherry picked from commit 77d1f0143e210c13ee8ec6aaf6b3150fa4ce6c5b)
BUG/MEDIUM: connection: fix proxy v2 header again!

Last commit 77d1f01 ("BUG/MEDIUM: connection: fix memory corruption
when building a proxy v2 header") was wrong, using &cn_trash instead
of cn_trash resulting in a warning and the client's SSL cert CN not
being stored at the proper location.

Thanks to Lukas Tribus for spotting this quickly.

This should be backported to 1.5 after the patch above is backported.
(cherry picked from commit 3b9a0c9d4d083d749846d66f9bd4caabafe4ee78)
[RELEASE] Released version 1.5.3

Released version 1.5.3 with the following main changes :
    - DOC: fix typo in Unix Socket commands
    - BUG/MEDIUM: connection: fix memory corruption when building a proxy v2 header
    - BUG/MEDIUM: ssl: Fix a memory leak in DHE key exchange
    - DOC: mention that Squid correctly responds 400 to PPv2 header
    - BUG/MINOR: http: base32+src should use the big endian version of base32
    - BUG/MEDIUM: connection: fix proxy v2 header again!
BUG/MINOR: server: move the directive #endif to the end of file

If a source file includes proto/server.h twice or more, redefinition errors will
be triggered for such inline functions as server_throttle_rate(),
server_is_draining(), srv_adm_set_maint() and so on. Just move #endif directive
to the end of file to solve this issue.

Signed-off-by: Godbach <nylzhaowei@gmail.com>
(cherry picked from commit e468d55998e134dac1b18d5d9d075ffd5691c827)
BUG/MINOR: Fix search for -p argument in systemd wrapper.

Searching for the pid file in the list of arguments did not
take flags without parameters into account, like e.g. -de. Because
of this, the wrapper would use a different pid file than haproxy
if such an argument was specified before -p.

The new version can still yield a false positive for some crazy
situations, like your config file name starting with "-p", but
I think this is as good as it gets without using getopt or some
library.

Signed-off-by: Conrad Hoffmann <conrad@soundcloud.com>
(cherry picked from commit eb2cf45b72a7e14c581276247381dc1ac76be2c0)
BUG/MAJOR: tcp: fix a possible busy spinning loop in content track-sc*

As a consequence of various recent changes on the sample conversion,
a corner case has emerged where it is possible to wait forever for a
sample in track-sc*.

The issue is caused by the fact that functions relying on sample_process()
don't all exactly work the same regarding the SMP_F_MAY_CHANGE flag and
the output result. Here it was possible to wait forever for an output
sample from stktable_fetch_key() without checking the SMP_OPT_FINAL flag.
As a result, if the client connects and closes without sending the data
and haproxy expects a sample which is capable of coming, it will ignore
this impossible case and will continue to wait.

This change adds control for SMP_OPT_FINAL before waiting for extra data.
The various relevant functions have been better documented regarding their
output values.

This fix must be backported to 1.5 since it appeared there.
(cherry picked from commit 6bcb0a84e7256f00793fa8ec8a0d6c19c3b22935)