... for functions related to pipelining. Those functions were removed in
2f44e94e.

Closes #3828

... due to SHA-1 signatures in test certs

Closes #3823
Closes #3776

- better log output

- make sure multiplex is enabled for it to be used

As soon as a TLS backend gets ALPN conformation about the specific HTTP
version it can now set the multiplex situation for the "bundle" and
trigger moving potentially queued up transfers to the CONNECT state.

With transfers being queued up, we only move one at a a time back to the
CONNECT state but now we mark moved transfers so that when a moved
transfer is confirmed "successful" (it connected) it will trigger the
move of another pending transfer. Previously, it would otherwise wait
until the transfer was done before doing this. This makes queued up
pending transfers get processed (much) faster.

Fixes #3813
Closes #3815

In case the name pointer isn't set (due to memory pressure most likely)
we need to skip the prefix matching and reject with a badcookie to avoid
a possible NULL pointer dereference.

Closes #3820 #3821
Reported-by: Jonathan Moerman
Reviewed-by: Daniel Stenberg <daniel@haxx.se>

Closes #3808

Closes #3811

This limits all accepted input strings passed to libcurl to be less than
CURL_MAX_INPUT_LENGTH (8000000) bytes, for these API calls:
curl_easy_setopt() and curl_url_set().

The 8000000 number is arbitrary picked and is meant to detect mistakes
or abuse, not to limit actual practical use cases. By limiting the
acceptable string lengths we also reduce the risk of integer overflows
all over.

NOTE: This does not apply to `CURLOPT_POSTFIELDS`.

Test 1559 verifies.

Closes #3805

Closes #3809

Closes https://github.com/curl/curl/pull/3769

Just like we do for mbed TLS, use our local implementation of MD4 when
OpenSSL doesn't support it. This allows a type-3 message to include the
NT response.

Kerberos was incorrectly indented as a subsection under FTP, which is
incorrect as they are both top level sections. A fix for this was first
attempted in commit fef38a08 but that
was a few paddles short of being complete.

Add the subsections under "Structs in libcurl" to the table of contents.

Reviewed-by: Daniel Stenberg <daniel@haxx.se>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>

Make all struct members under the Curl_handler section
print in monospace font.

Closes #3801
Reviewed-by: Daniel Stenberg <daniel@haxx.se>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>

Introducing the curl bug bounty program on hackerone. We now recommend
filing security issues directly in the hackerone ticket system which
only is readable to curl security team members.

Assisted-by: Daniel Gustafsson

Closes #3488

RFC 4616 specifies the authzid is optional in the client authentication
message and that the server will derive the authorisation identity
(authzid) from the authentication identity (authcid) when not specified
by the client.

Follow-up to 76b63489 which renamed logfile as curl_dbg_logfile.

Ref: https://github.com/curl/curl/commit/76b6348#r33259088

Follow up to 762a292f.

... and disconnect too old ones instead of trying to reuse.

Default max age is set to 118 seconds.

Ref: #3722
Closes #3782

ALTSVC requires Curl_get_line which is defined in lib/cookie.c inside a #if
check of HTTP and COOKIES. That makes Curl_get_line undefined if COOKIES is
disabled. Fix by splitting out the function into a separate file which can
be included where needed.

Closes #3717
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Reviewed-by: Marcel Raad <Marcel.Raad@teamviewer.com>

which basically just makes sure LOGOUT is *not* issued on disconnect

Since the connection has been used by the "outside" we don't know the
state of it anymore and curl should not use it anymore.

Bug: https://curl.haxx.se/mail/lib-2019-04/0052.html

Closes #3795

The list of names must be in sync with the defined states in the header
file!

Fixes #3768
Closes #3785

.. because functionality may be affected if the versions differ.

This commit implements TODO 18.7 "warning if curl version is not in sync
with libcurl version".

Ref: https://github.com/curl/curl/blob/curl-7_64_1/docs/TODO#L1028-L1033

Closes https://github.com/curl/curl/pull/3774

Following 28f826b3 to return CURLE_OK instead of numeric 0.