When connecting to a domain with multiple IP addresses, allow different,
decreasing connection timeout values. This should guarantee some
connections attempts with sufficiently long timeouts, while still
providing fallback.

With advice from Nikos Mavrogiannopoulos, changed the priority string to
add "actual priorities" and favour ARCFOUR. This makes libcurl work
better when enforcing SSLv3 with GnuTLS. Both in the sense that the
libmicrohttpd test is now working again but also that it mitigates a
weakness in the older SSL/TLS protocols.

Bug: http://curl.haxx.se/mail/lib-2012-01/0225.html
Reported by: Christian Grothoff

Protocols (IMAP, POP3 and SMTP) that use the path part of a URL in a
decoded manner now use the new Curl_urldecode() function to reject URLs
with embedded control codes (anything that is or decodes to a byte value
less than 32).

URLs containing such codes could easily otherwise be used to do harm and
allow users to do unintended actions with otherwise innocent tools and
applications. Like for example using a URL like
pop3://pop3.example.com/1%0d%0aDELE%201 when the app wants a URL to get
a mail and instead this would delete one.

This flaw is considered a security vulnerability: CVE-2012-0036

Security advisory at: http://curl.haxx.se/docs/adv_20120124.html

Reported by: Dan Fandrich

OpenSSL added a work-around for a SSL 3.0/TLS 1.0 CBC vulnerability
(http://www.openssl.org/~bodo/tls-cbc.txt). In 0.9.6e they added a bit
to SSL_OP_ALL that _disables_ that work-around despite the fact that
SSL_OP_ALL is documented to do "rather harmless" workarounds.

The libcurl code uses the SSL_OP_ALL define and thus logically always
disables the OpenSSL fix.

In order to keep the secure work-around workding, the
SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS bit must not be set and this change
makes sure of this.

Reported by: product-security at Apple

Using a URL with embedded user name and password didn't work if the host
was given as a numerical IPv6 string, like ftp://user:password@[::1]/

Reported by: Brandon Wang
Bug: http://curl.haxx.se/mail/archive-2012-01/0047.html

avoid checking preprocessor definition official value

Apparently ssl_get_ciphersuite() is needed to get the name of the used
cipher suite.

The value was turned negative when it shouldn't have been

... it is now named havege_random!

Reported by: Robert Schumann
Bug: http://curl.haxx.se/mail/lib-2012-01/0178.html

Fix a bug where input was read from stdin even when a different FILE *
had been configured via CURLOPT_READDATA

bug: http://curl.haxx.se/bug/view.cgi?id=3474308

Leak triggered when CURLOPT_SSLCERTTYPE and CURLOPT_SSLKEYTYPE set to P12
and both CURLOPT_SSLCERT and CURLOPT_SSLKEY point to the same PKCS#12 file.

SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG option enabling allowed successfull
interoperability with web server Netscape Enterprise Server 2.0.1 released
back in 1996 more than 15 years ago.

Due to CVE-2010-4180, option SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG has
become ineffective as of OpenSSL 0.9.8q and 1.0.0c. In order to mitigate
CVE-2010-4180 when using previous OpenSSL versions we no longer enable
this option regardless of OpenSSL version and SSL_OP_ALL definition.

Some functions using getaddrinfo and gethostbyname were still
mistakingly being used/linked even if c-ares was selected as resolver
backend.

Reported by: Arthur Murray
Bug: http://curl.haxx.se/mail/lib-2012-01/0160.html

Test 161 updated accordingly

Previously the code would create a dummy socket while resolving just to
have curl_multi_fdset() return something but the non-win32 version
doesn't do it this way and the creation and use of a socket that isn't
made with the common create-socket callback can be confusing to apps
using the multi_socket API etc.

This change removes the dummy socket and thus will cause
curl_multi_fdset() to return with maxfd == -1 more often.

With this change, curl compiles with the new OPENSSL_NO_SSL_INTERN
cflag. This flag might become the default in some distant future.

Fixed a problem in POP3 and IMAP where a connection would fail when
CURLUSESSL_TRY was specified for a server that didn't support
SSL/TLS connections rather than continuing.

The STARTTLS response code in SMTP, POP3 and IMAP would return
CURLE_LOGIN_DENIED rather than CURLE_USE_SSL_FAILED when SSL/TLS
was not available on the server.

Reported by: Gokhan Sengun
Bug: http://curl.haxx.se/mail/lib-2012-01/0018.html

Unfortunately we have no test cases for this and I have no SSPI build or
server to verify this with. The change seems simple enough though.

Bug: http://curl.haxx.se/bug/view.cgi?id=3466497
Reported by: Patrice Guerin

When the buffer gets realloced to hold the file name in the
SSH_SFTP_READDIR_LINK state, the counter was not bumped accordingly.

Reported by: Armel Asselin
Patch by: Armel Asselin
Bug: http://curl.haxx.se/mail/lib-2011-12/0249.html

... to make sure the DNS cache is properly case insensitive

When a HTTP connection is re-used for a subsequent request without
proxy, it would always re-use the Host: header of the first request. As
host names are case insensitive it would make curl send another host
name case that what the particular request used.

Now it will instead always use the most recent host name to always use
the desired casing.

Added test case 1318 to verify.

Bug: http://curl.haxx.se/mail/lib-2011-12/0314.html
Reported by: Alex Vinnik

The load host names to DNS cache function was moved to hostip.c and it
now makes sure to not add host names that already are present in the
cache. It would previously lead to memory leaks when for example using
the --resolve and multiple URLs on the command line.

The commit 9dd85bce unintentionally changed the way we compute the time
spent waiting for 100-continue.  In particular, when using a SSL client
certificate, the time spent by SSL handshake was included and could
cause the CURL_TIMEOUT_EXPECT_100 timeout to be mistakenly fired up.

Bug: https://bugzilla.redhat.com/767490
Reported by: Mamoru Tasaka