Each backend now defines CURL_SSL_BACKEND accordingly. Added the *AXTLS
one which was missing previously.

To force each backend implementation to really attempt to provide proper
random. If a proper random function is missing, then we can explicitly
make use of the default one we use when TLS support is missing.

This commit makes sure it works for darwinssl, gnutls, nss and openssl.

Curl_rand() will return a dummy and repatable random value for this
case. Makes it possible to write test cases that verify output.

Also, fake timestamp with CURL_FORCETIME set.

Only when built debug enabled of course.

Curl_ssl_random() was not used anymore so it has been
removed. Curl_rand() is enough.

create_digest_md5_message: generate base64 instead of hex string

curl_sasl: also fix memory leaks in some OOM situations

Our own printf() replacement clearly can't properly handle %.*s with a
string that isn't zero terminated. Instead of fixing the printf code or
even figuring out what the proper posix behavior is, I reverted this
piece of the code back to the previous version where it does malloc +
memcpy instead.

Regression added in e839446c, released in curl 7.32.0.

Reported-by: Felix Yan
Bug: http://curl.haxx.se/bug/view.cgi?id=1295

Use simple seeding method upon RANDOM_FILE seeding method failure.

When doing multi-part formposts, libcurl used a pseudo-random value that
was seeded with time(). This turns out to be bad for users who formpost
data that is provided with users who then can guess how the boundary
string will look like and then they can forge a different formpost part
and trick the receiver.

My advice to such implementors is (still even after this change) to not
rely on the boundary strings being cryptographically strong. Fix your
code and logic to not depend on them that much!

I moved the Curl_rand() function into the sslgen.c source file now to be
able to take advantage of the SSL library's random function if it
provides one. If not, try to use the RANDOM_FILE for seeding and as a
last resort keep the old logic, just modified to also add microseconds
which makes it harder to properly guess the exact seed.

The formboundary() function in formdata.c is now using 64 bit entropy
for the boundary and therefore the string of dashes was reduced by 4
letters and there are 16 hex digits following it. The total length is
thus still the same.

Bug: http://curl.haxx.se/bug/view.cgi?id=1251
Reported-by: "Floris"

This commit renames lib/setup.h to lib/curl_setup.h and
renames lib/setup_once.h to lib/curl_setup_once.h.

Removes the need and usage of a header inclusion guard foreign
to libcurl. [1]

Removes the need and presence of an alarming notice we carried
in old setup_once.h [2]

----------------------------------------

1 - lib/setup_once.h used __SETUP_ONCE_H macro as header inclusion guard
    up to commit ec691ca3 which changed this to HEADER_CURL_SETUP_ONCE_H,
    this single inclusion guard is enough to ensure that inclusion of
    lib/setup_once.h done from lib/setup.h is only done once.

    Additionally lib/setup.h has always used __SETUP_ONCE_H macro to
    protect inclusion of setup_once.h even after commit ec691ca3, this
    was to avoid a circular header inclusion triggered when building a
    c-ares enabled version with c-ares sources available which also has
    a setup_once.h header. Commit ec691ca3 exposes the real nature of
    __SETUP_ONCE_H usage in lib/setup.h, it is a header inclusion guard
    foreign to libcurl belonging to c-ares's setup_once.h

    The renaming this commit does, fixes the circular header inclusion,
    and as such removes the need and usage of a header inclusion guard
    foreign to libcurl. Macro __SETUP_ONCE_H no longer used in libcurl.

2 - Due to the circular interdependency of old lib/setup_once.h and the
    c-ares setup_once.h header, old file lib/setup_once.h has carried
    back from 2006 up to now days an alarming and prominent notice about
    the need of keeping libcurl's and c-ares's setup_once.h in sync.

    Given that this commit fixes the circular interdependency, the need
    and presence of mentioned notice is removed.

    All mentioned interdependencies come back from now old days when
    the c-ares project lived inside a curl subdirectory. This commit
    removes last traces of such fact.

This reverts renaming and usage of lib/*.h header files done
28-12-2012, reverting 2 commits:

  f871de00... build: make use of 76 lib/*.h renamed files
  ffd8e127... build: rename 76 lib/*.h files

This also reverts removal of redundant include guard (redundant thanks
to changes in above commits) done 2-12-2013, reverting 1 commit:

  c087374c... curl_setup.h: remove redundant include guard

This also reverts renaming and usage of lib/*.c source files done
3-12-2013, reverting 3 commits:

  13606bbf... build: make use of 93 lib/*.c renamed files
  5b6e7927... build: rename 93 lib/*.c files
  7d83dfff... build: commit 13606bbf follow-up 1

Start of related discussion thread:

  http://curl.haxx.se/mail/lib-2013-01/0012.html

Asking for confirmation on pushing this revertion commit:

  http://curl.haxx.se/mail/lib-2013-01/0048.html

Confirmation summary:

  http://curl.haxx.se/mail/lib-2013-01/0079.html

NOTICE: The list of 2 files that have been modified by other
intermixed commits, while renamed, and also by at least one
of the 6 commits this one reverts follows below. These 2 files
will exhibit a hole in history unless git's '--follow' option
is used when viewing logs.

  lib/curl_imap.h
  lib/curl_smtp.h

93 lib/*.c source files renamed to use our standard naming scheme.

This commit only does the file renaming.

----------------------------------------

  renamed:    lib/amigaos.c -> lib/curl_amigaos.c
  renamed:    lib/asyn-ares.c -> lib/curl_asyn_ares.c
  renamed:    lib/asyn-thread.c -> lib/curl_asyn_thread.c
  renamed:    lib/axtls.c -> lib/curl_axtls.c
  renamed:    lib/base64.c -> lib/curl_base64.c
  renamed:    lib/bundles.c -> lib/curl_bundles.c
  renamed:    lib/conncache.c -> lib/curl_conncache.c
  renamed:    lib/connect.c -> lib/curl_connect.c
  renamed:    lib/content_encoding.c -> lib/curl_content_encoding.c
  renamed:    lib/cookie.c -> lib/curl_cookie.c
  renamed:    lib/cyassl.c -> lib/curl_cyassl.c
  renamed:    lib/dict.c -> lib/curl_dict.c
  renamed:    lib/easy.c -> lib/curl_easy.c
  renamed:    lib/escape.c -> lib/curl_escape.c
  renamed:    lib/file.c -> lib/curl_file.c
  renamed:    lib/fileinfo.c -> lib/curl_fileinfo.c
  renamed:    lib/formdata.c -> lib/curl_formdata.c
  renamed:    lib/ftp.c -> lib/curl_ftp.c
  renamed:    lib/ftplistparser.c -> lib/curl_ftplistparser.c
  renamed:    lib/getenv.c -> lib/curl_getenv.c
  renamed:    lib/getinfo.c -> lib/curl_getinfo.c
  renamed:    lib/gopher.c -> lib/curl_gopher.c
  renamed:    lib/gtls.c -> lib/curl_gtls.c
  renamed:    lib/hash.c -> lib/curl_hash.c
  renamed:    lib/hmac.c -> lib/curl_hmac.c
  renamed:    lib/hostasyn.c -> lib/curl_hostasyn.c
  renamed:    lib/hostcheck.c -> lib/curl_hostcheck.c
  renamed:    lib/hostip.c -> lib/curl_hostip.c
  renamed:    lib/hostip4.c -> lib/curl_hostip4.c
  renamed:    lib/hostip6.c -> lib/curl_hostip6.c
  renamed:    lib/hostsyn.c -> lib/curl_hostsyn.c
  renamed:    lib/http.c -> lib/curl_http.c
  renamed:    lib/http_chunks.c -> lib/curl_http_chunks.c
  renamed:    lib/http_digest.c -> lib/curl_http_digest.c
  renamed:    lib/http_negotiate.c -> lib/curl_http_negotiate.c
  renamed:    lib/http_negotiate_sspi.c -> lib/curl_http_negotiate_sspi.c
  renamed:    lib/http_proxy.c -> lib/curl_http_proxy.c
  renamed:    lib/idn_win32.c -> lib/curl_idn_win32.c
  renamed:    lib/if2ip.c -> lib/curl_if2ip.c
  renamed:    lib/imap.c -> lib/curl_imap.c
  renamed:    lib/inet_ntop.c -> lib/curl_inet_ntop.c
  renamed:    lib/inet_pton.c -> lib/curl_inet_pton.c
  renamed:    lib/krb4.c -> lib/curl_krb4.c
  renamed:    lib/krb5.c -> lib/curl_krb5.c
  renamed:    lib/ldap.c -> lib/curl_ldap.c
  renamed:    lib/llist.c -> lib/curl_llist.c
  renamed:    lib/md4.c -> lib/curl_md4.c
  renamed:    lib/md5.c -> lib/curl_md5.c
  renamed:    lib/memdebug.c -> lib/curl_memdebug.c
  renamed:    lib/mprintf.c -> lib/curl_mprintf.c
  renamed:    lib/multi.c -> lib/curl_multi.c
  renamed:    lib/netrc.c -> lib/curl_netrc.c
  renamed:    lib/non-ascii.c -> lib/curl_non_ascii.c
  renamed:    lib/curl_non-ascii.h -> lib/curl_non_ascii.h
  renamed:    lib/nonblock.c -> lib/curl_nonblock.c
  renamed:    lib/nss.c -> lib/curl_nss.c
  renamed:    lib/nwlib.c -> lib/curl_nwlib.c
  renamed:    lib/nwos.c -> lib/curl_nwos.c
  renamed:    lib/openldap.c -> lib/curl_openldap.c
  renamed:    lib/parsedate.c -> lib/curl_parsedate.c
  renamed:    lib/pingpong.c -> lib/curl_pingpong.c
  renamed:    lib/polarssl.c -> lib/curl_polarssl.c
  renamed:    lib/pop3.c -> lib/curl_pop3.c
  renamed:    lib/progress.c -> lib/curl_progress.c
  renamed:    lib/qssl.c -> lib/curl_qssl.c
  renamed:    lib/rawstr.c -> lib/curl_rawstr.c
  renamed:    lib/rtsp.c -> lib/curl_rtsp.c
  renamed:    lib/security.c -> lib/curl_security.c
  renamed:    lib/select.c -> lib/curl_select.c
  renamed:    lib/sendf.c -> lib/curl_sendf.c
  renamed:    lib/share.c -> lib/curl_share.c
  renamed:    lib/slist.c -> lib/curl_slist.c
  renamed:    lib/smtp.c -> lib/curl_smtp.c
  renamed:    lib/socks.c -> lib/curl_socks.c
  renamed:    lib/socks_gssapi.c -> lib/curl_socks_gssapi.c
  renamed:    lib/socks_sspi.c -> lib/curl_socks_sspi.c
  renamed:    lib/speedcheck.c -> lib/curl_speedcheck.c
  renamed:    lib/splay.c -> lib/curl_splay.c
  renamed:    lib/ssh.c -> lib/curl_ssh.c
  renamed:    lib/sslgen.c -> lib/curl_sslgen.c
  renamed:    lib/ssluse.c -> lib/curl_ssluse.c
  renamed:    lib/strdup.c -> lib/curl_strdup.c
  renamed:    lib/strequal.c -> lib/curl_strequal.c
  renamed:    lib/strerror.c -> lib/curl_strerror.c
  renamed:    lib/strtok.c -> lib/curl_strtok.c
  renamed:    lib/strtoofft.c -> lib/curl_strtoofft.c
  renamed:    lib/telnet.c -> lib/curl_telnet.c
  renamed:    lib/tftp.c -> lib/curl_tftp.c
  renamed:    lib/timeval.c -> lib/curl_timeval.c
  renamed:    lib/transfer.c -> lib/curl_transfer.c
  renamed:    lib/url.c -> lib/curl_url.c
  renamed:    lib/version.c -> lib/curl_version.c
  renamed:    lib/warnless.c -> lib/curl_warnless.c
  renamed:    lib/wildcard.c -> lib/curl_wildcard.c

----------------------------------------

76 private header files renamed to use our standard naming scheme.

This change affects 322 files in libcurl's source tree.

Inclusion of top two most included header files now done in setup_once.h

- Renamed st_ function prefix to darwinssl_
- Renamed Curl_st_ function prefix to Curl_darwinssl_
- Moved the duplicated ssl_connect_done out of the #ifdef in lib/urldata.h
- Fixed a teensy little bug that made non-blocking connection attempts block
- Made it so that it builds cleanly against the iOS 5.1 SDK

curl_ntlm_msgs.c would previously use an #ifdef maze and direct
SSL-library calls instead of using the SSL layer we have for this
purpose.

Bug: https://bugzilla.redhat.com/788526
Reported by: Enrico Scholz

This gets the appconnect time right for ssl backends, which don't
support non-blocking connects.

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>

Added convenience macro to use to check if a handle is using a shared
SSL session, and fixed so that Curl_ssl_close_all() doesn't lock when
the session isn't shared.

Also, check for the session sharing bit instead of comparing pointers

Previously the age counter would be counted individually in each easy
handle that shared SSL sessions!

With locking, plus test, plus documentation

By the use of a the new lib/checksrc.pl script that checks that our
basic source style rules are followed.

When going back from SSL, put the send/recv function pointers back to
the plain versions.

Bug: http://curl.haxx.se/mail/lib-2011-04/0070.html
Reported by: Mehmet Bozkurt

This is the modified existing files commit.

In OOM situation. Follow-up fix to commit a9cd4f4e.