Added support for detecting the supported SASL authentication mechanisms
via the AUTH command. There are two ways of detecting them, either by
using the AUTH command, that will return -ERR if not supported or by
using the CAPA command which will return SASL and the list of mechanisms
if supported, not include SASL if SASL authentication is not supported
or -ERR if the CAPA command is not supported. As such it seems simpler
to use the AUTH command and fallback to normal clear text authentication
if the the command is not supported.

Additionally updated the test cases to return -ERR when the AUTH command
is encountered. Additional test cases will be added when support for the
individual authentication mechanisms is added.

Moved EOB definition into header file.

Switched the logic around in pop3_endofresp() to allow for the
introduction of auth-mechanism detection.

Repositioned second and third function variables where they will fit
within the 78 character line limit.

Tidied up some comments.

Move the SMTP_AUTH constants into a separate header file in
preparation for adding SASL based authentication to POP3 as the two
protocols will need to share them.

Due to the result code being reset to CURLE_OK when smtp_dophase_done()
was called, postdata would incorrectly be sent to the server when the
MAIL FROM or RCPT command was rejected.

As such, libcurl would return the wrong result code from performing the
operation and additionally set CURLINFO_RESPONSE_CODE to be that
returned by the postdata command.

Bug: http://curl.haxx.se/mail/lib-2012-05/0108.html
Reported by: Gokhan Sengun

In nettle/md5.h, md5_init and md5_update are defined as macros to
nettle_md5_init and nettle_md5_update respectively.  This causes
error when using MD5_params.md5_init and md5_update.  This patch
renames these members as md5_init_func and md5_update_func to
avoid name conflict. For completeness, MD5_params.md5_final was
also renamed as md5_final_func.

The changes in curl_ntlm_core.c is conversion error and fixed by
casting to proper type.

A dot character at the beginning of a line would not be escaped to a
double dot as required by RFC-2821, instead it would be deleted by the
mail server. Please see section 4.5.2 of the RFC for more information.

Note: This fix also simplifies the detection of repeated CRLF.CRLF
combinations, such as CRLF.CRLF.CRLF, a little rather than having to
advance the eob counter to 2.

check whether md5 initialization succeeded before updating digest of
buffers onto it

Roman Mamedov spotted (in
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=670126) that curl would
not complain when given a URL with an IPv6 numerical address without
brackets. It would simply cut off the last ":[hex]" part and thus not
work correctly.

That's a URL using an illegal syntax and now libcurl will instead return
a clear error code and error message detailing the error.

The above mentioned bug report claims this to be a regression but
libcurl does not guarantee functionality when given URLs that aren't
following the URL spec (RFC3986 mostly). I consider the fact that it
used to handle this differently a mere coincidence.

Bug: http://curl.haxx.se/mail/lib-2012-04/0246.html
Reported by: Michael Mueller

curl needs to be more chatty regarding certificate verification failure
during SSL handshake

This reverts commit 2976de48.

This reverts commit 46cd5f1d.

This reverts commit 77172a24.

This reverts commit 683bfa60.

This reverts commit 412510f9.

Added version information for Windows SSPI to curl's main version
string and removed SSPI from the features string.

When doing a chunked-encoded POST with -d (CURLOPT_POSTFIELDS) and the
size of the POST was zero length, it made libcurl first send a zero
chunk and then the terminating one. This could confuse a receiver and it
should rather just send the terminating chunk as it does with this fix.

Test case 1333 is added to verify.

Bug: http://curl.haxx.se/mail/archive-2012-04/0060.html
Reported by: Arnaud Compan

Commit 9109cdec brought this regression (shipped since 7.24.0).

The singleipconnect() function must not return an error if Curl_socket()
returns an error. It should then simply return OK and pass a SOCKET_BAD
back simply because that is how the user of this function expects it to
work and something else is not fine.

Reported by: Blaise Potard
Bug: http://curl.haxx.se/bug/view.cgi?id=3516508

MIPSPro compiler detected curl_easy_getinfo() related missing adjustments.
SunPro compiler detected curl tool --libcurl option related missing adjustments.

Fail with CURLE_NOT_BUILT_IN when none of requested auth methods is supported.

Reject CURLAUTH_ONLY bit when given alone or with CURLAUTH_NONE.

Data type of internal vars holding CURLAUTH_* bitmasks changed from 'long' to
'unsigned long' for proper handling and operating.

Include stdbool.h only when it is available and configure is capable of
detecting a proper 'bool' data type when the header is included.

Compilation fix for old or unpatched versions of XL C compiler.

Report: http://curl.haxx.se/mail/archive-2012-04/0022.html

Usage in other code paths already protected and requiring even newer versions.

This protects from attribute names being defined by third party's code.

Improvement: http://curl.haxx.se/mail/lib-2012-04/0127.html