Proxy NTLM authentication should compare credentials when
re-using a connection similar to host authentication, as it
authenticate the connection.

Example:
curl -v -x http://proxy:port http://host/ -U good_user:good_pwd
  --proxy-ntlm --next -x http://proxy:port http://host/
    [-U fake_user:fake_pwd --proxy-ntlm]

CVE-2016-0755

Bug: http://curl.haxx.se/docs/adv_20160127A.html

curl does not sanitize colons in a remote file name that is used as the
local file name. This may lead to a vulnerability on systems where the
colon is a special path character. Currently Windows/DOS is the only OS
where this vulnerability applies.

CVE-2016-0754

Bug: http://curl.haxx.se/docs/adv_20160127B.html

Current FAQ didn't make it clear where the main repo is.

Closes #612

bug: http://curl.haxx.se/mail/lib-2016-01/0123.html

- Switch from verifying a pinned public key in a callback during the
certificate verification to inline after the certificate verification.

The callback method had three problems:

1. If a pinned public key didn't match, CURLE_SSL_PINNEDPUBKEYNOTMATCH
was not returned.

2. If peer certificate verification was disabled the pinned key
verification did not take place as it should.

3. (related to #2) If there was no certificate of depth 0 the callback
would not have checked the pinned public key.

Though all those problems could have been fixed it would have made the
code more complex. Instead we now verify inline after the certificate
verification in mbedtls_connect_step2.

Ref: http://curl.haxx.se/mail/lib-2016-01/0047.html
Ref: https://github.com/bagder/curl/pull/601

Because disabling the peer verification (--insecure) must not disable
the public key pinning check (--pinnedpubkey).

The CURLOPT_SSH_PUBLIC_KEYFILE option has been documented to handle
empty strings specially since curl-7_25_0-31-g05a443a but the behavior
was unintentionally removed in curl-7_38_0-47-gfa7d04f.

This commit restores the original behavior and clarifies it in the
documentation that NULL and "" have both the same meaning when passed
to CURLOPT_SSH_PUBLIC_KEYFILE.

Bug: http://curl.haxx.se/mail/lib-2016-01/0072.html

... by extracting the LIB + REASON from the OpenSSL error code. OpenSSL
1.1.0+ returned a new func number of another cerfificate fail so this
required a fix and this is the better way to catch this error anyway.

The configure test uses AC_TRY_RUN to figure out if an ipv6 socket
works, and testing like that doesn't work for cross-compiles. These days
IPv6 support is widespread so a blind guess is probably more likely to
be 'yes' than 'no' now.

Further: anyone who cross-compiles can use configure's --disable-ipv6 to
explicitly disable IPv6 and that also works for cross-compiles.

Made happen after discussions in issue #594

Closes #514

When an HTTP/2 upgrade request fails (no protocol switch), it would
previously detect that as still possible to pipeline on (which is
acorrect) and do that when PIPEWAIT was enabled even if pipelining was
not explictily enabled.

It should only pipelined if explicitly asked to.

Closes #584

Before this patch, if a URL does not start with the protocol
name/scheme, effective URLs would be prefixed with upper-case protocol
names/schemes. This behavior might not be expected by library users or
end users.

For example, if `CURLOPT_DEFAULT_PROTOCOL` is set to "https". And the
URL is "hostname/path". The effective URL would be
"HTTPS://hostname/path" instead of "https://hostname/path

".

After this patch, effective URLs would be prefixed with a lower-case
protocol name/scheme.

Closes #597

Signed-off-by: Mohammad AlSaleh <CE.Mohammad.AlSaleh@gmail.com>

The script should use the just-built curl, not the system one. This fixes
zsh completion generation when no system curl is installed.

Instead of generation a broken completion file.

Closes #596

.. and enable SSLpinning tests for mbedTLS, BoringSSL and LibreSSL.

Previously, when HTTP/2 is enabled and used, and stream has content
length known, Curl_read was not called when there was no bytes left to
read. Because of this, we could not make sure that
http2_handle_stream_close was called for every stream. Since we use
http2_handle_stream_close to emit trailer fields, they were
effectively ignored. This commit changes the code so that Curl_read is
called even if no bytes left to read, to ensure that
http2_handle_stream_close is called for every stream.

Discussed in https://github.com/bagder/curl/pull/564

This regression landed in 5778e6f5 and made libcurl not act on received
settings and instead stayed with its internal defaults.

Bug: http://curl.haxx.se/mail/lib-2016-01/0031.html
Reported-by: Bankde

This reverts commit 46cb70e9.

Bug: http://curl.haxx.se/mail/lib-2016-01/0031.html

Discussed in https://github.com/bagder/curl/pull/564

Use the ACE form of IDN hostnames as key in the connection cache.  Add
new tests.

Closes #592

- Fix ALPN reply detection.

- Wrap nghttp2 code in ifdef USE_NGHTTP2.


Prior to this change ALPN and HTTP/2 did not work properly in mbedTLS.

Check that the trailer buffer exists before attempting a client write
for trailers on stream close.

Refer to comments in https://github.com/bagder/curl/pull/564

Mistake from commit a464f338