CHANGES

                                  _   _ ____  _
                              ___| | | |  _ \| |
                             / __| | | | |_) | |
                            | (__| |_| |  _ <| |___
                             \___|\___/|_| \_\_____|

                                  Changelog

Daniel Stenberg (5 June 2010)
- Constantine Sapuntzakis fixed a case of spurious SSL connection aborts using
  libcurl and OpenSSL. "I tracked it down to uncleared error state on the
  OpenSSL error stack - patch attached deals with that."

Daniel Stenberg (5 June 2010)
- Frank Meier added CURLINFO_PRIMARY_PORT, CURLINFO_LOCAL_IP and
  CURLINFO_LOCAL_PORT to curl_easy_getinfo().

Yang Tse (4 June 2010)
- Enabled OpenLDAP support for cygwin builds. This support was disabled back
  in 2008 due to incompatibilities between OpenSSL and OpenLDAP headers.
  cygwin's OpenSSL 0.9.8l and OpenLDAP 2.3.43 versions on cygwin 1.5.25
  allow building an OpenLDAP enabled libcurl supporting back to Windows 95.

  Removed the non-functional CURL_LDAP_HYBRID code and references.

Daniel Stenberg (2 June 2010)
- Jason McDonald posted bug report #3006786 when he found that the SFTP code
  didn't timeout properly in several places in the code even if a timeout was
  set properly.

  Based on his suggested patch, I wrote a different implementation that I
  think addressed the issue better and also uses the connect timeout for the
  initial part of the SSH/SFTP done during the "protocol connect" phase.

  (http://curl.haxx.se/bug/view.cgi?id=3006786)

Yang Tse (2 June 2010)
- Added missing new libcurl files to non-configure targets. Adjusted
  libcurl standard internal header inclusions in new files. Fixed an
  SPNEGO related memory leak. Fixed several LDAP related compilation
  issues, and fixed some compiler warnings.

Daniel Stenberg (1 June 2010)
- Igor Novoseltsev reported a problem with the multi socket API and using
  timeouts and timers. It boiled down to a problem with libcurl's use of
  GetTickCount() interally to figure out the current time, while Igor's own
  application code used another function call.

  It made his app call the socket API timeout function a bit _before_ libcurl
  would consider the timeout to trigger, and that could easily lead to
  timeouts or stalls in the app. It seems GetTickCount() in general often has
  no better resolution than 16ms and switching to the alternative function
  QueryPerformanceCounter has its share of problems:
      http://www.virtualdub.org/blog/pivot/entry.php?id=106

  We address this problem by simply having libcurl treat timers that already
  has occured or will occur within 40ms subject for treatment. I'm confident
  that there are other implementations and operating systems with similarly in
  accurate timer functions so it makes sense to have applied generically and I
  don't believe we sacrifice much by adding a 40ms inaccuracy on these
  timeouts.

Kamil Dudka (27 May 2010)
- added a new test for CRL support (test313)

- Tor Arntsen changed the alternative definition of bool to use enum instead
  of unsigned char.

Daniel Stenberg (25 May 2010)
- Julien Chaffraix fixed the warning seen when compiling lib/rtmp.c: one
  unused variables, several unused arguments and some missing #include.

- Julien Chaffraix fixed 2 OOM errors: a missing NULL-check in
  lib/http_negociate.c and a potential NULL dereferencing in lib/splay.c

- Howard Chu brought a patch that makes the LDAP code much cleaner, nicer and
  in general being a better libcurl citizen. If a new enough OpenLDAP version
  is detect, the new and shiny lib/openldap.c code is then used instead of the
  old cruft.

Daniel Stenberg (21 May 2010)
- Eric Mertens posted bug #3003705: when we made TFTP use the correct timeout
  option when sent to the server (fixed May 18th 2010) it became obvious that
  libcurl used invalid timeout values (300 by default while the RFC allows
  nothing above 255). While of course it is obvious that as TFTP has worked
  thus far without being able to set timeout at all, just removing the setting
  wouldn't make any difference in behavior. I decided to still keep it (but
  fix the problem) as it now actually allows for easier (future) customization
  of the timeout.

  (http://curl.haxx.se/bug/view.cgi?id=3003705)

- Douglas Kilpatrick filed bug report #3004787 and pointed out that the TFTP
  code didn't handle block id wraps correctly. His suggested fix inspired the
  fix I committed.

  (http://curl.haxx.se/bug/view.cgi?id=3004787)

Daniel Stenberg (20 May 2010)
- Tanguy Fautre brought a fix to allow curl to build with Microsoft VC10.

Daniel Stenberg (18 May 2010)
- Eric Mertens posted bug report #3003005 pointing out that the libcurl TFTP
  code was not sending the timeout option properly to the server, and
  suggested a fix.

  (http://curl.haxx.se/bug/view.cgi?id=3003005)

Kamil Dudka (16 May 2010)
- Pavel Raiskup introduced a new option CURLOPT_FNMATCH_DATA in order to pass
  a custom data pointer to the callback specified by CURLOPT_FNMATCH_FUNCTION.

Daniel Stenberg (14 May 2010)
- John-Mark Bell filed bug #3000052 that identified a problem (with an
  associated patch) with the OpenSSL handshake state machine when the multi
  interface is used:

  Performing an https request using a curl multi handle and using select or
  epoll to wait for events results in a hang. It appears that the cause is the
  fix for bug #2958179, which makes ossl_connect_common unconditionally return
  from the step 2 loop when fetching from a multi handle.

  When ossl_connect_step2 has completed, it updates connssl->connecting_state
  to ssl_connect_3. ossl_connect_common will then return to the caller, as a
  multi handle is in use. Eventually, the client code will call
  curl_multi_fdset to obtain an updated fdset to select or epoll on. For https
  requests, curl_multi_fdset will cause https_getsock to be called.
  https_getsock will only return a socket handle if the connecting_state is
  ssl_connect_2_reading or ssl_connect_2_writing.  Therefore, the client will
  never obtain a valid fdset, and thus not drive the multi handle, resulting
  in a hang.

  (http://curl.haxx.se/bug/view.cgi?id=3000052)

- Sebastian V reported bug #3000056 identifying a problem with redirect
  following. It showed that when curl followed redirects it didn't properly
  ignore the response body of the 30X response if that response was using
  compressed Content-Encoding!

  (http://curl.haxx.se/bug/view.cgi?id=3000056)
  
Daniel Stenberg (12 May 2010)
- Howard Chu brought support for RTMP. This is powered by the underlying
  librtmp library. It supports a range of variations and "sub-protocols"
  within the RTMP family.

- Pavel Raiskup brought support for FTP directory wildcard matching to allow
  selective downloading. To provide that, a set of new options were added:

   CURLOPT_WILDCARDMATCH
   CURLOPT_CHUNK_BGN_FUNCTION
   CURLOPT_CHUNK_END_FUNCTION
   CURLOPT_CHUNK_DATA
   CURLOPT_FNMATCH_FUNCTION

  There were also a set of new tests added (574 - 577) to verify this.

Kamil Dudka (11 May 2010)
- CRL support in libcurl-NSS has been completely broken. Now it works. Original
  bug report: https://bugzilla.redhat.com/581926

Daniel Stenberg (7 May 2010)
- Dirk Manske reported a regression. When connecting with the multi interface,
  there were situations where libcurl wouldn't store connect time correctly as
  it used to (and is documented to) do.

  Using his fine sample program we could repeat it, and I wrote up test case
  573 using that code. The problem does not easily show itself using the local
  test suite though.

  The fix, also as suggested by Dirk, is a bit on the ugly side as it adds yet
  another call to Curl_verboseconnect() and setting the TIMER_CONNECT time.
  That situation is subject for some closer inspection in the future.

- Howard Chu split the I/O handling functions into private handlers.
    
  Howard Chu brought the bulk work of this patch that properly moves out the
  sending and recving of data to the parts of the code that are properly
  responsible for the various ways of doing so.
  
  Daniel Stenberg assisted with polishing a few bits and fixed some minor
  flaws in the original patch.
  
  Another upside of this patch is that we now abuse CURLcodes less with the
  "magic" -1 return codes and instead use CURLE_AGAIN more consistently.

Daniel Stenberg (5 May 2010)
- Hoi-Ho Chan introduced support for using the PolarSSL library. You control
  this with the new configure option --with-polarssl.

Daniel Stenberg (29 Apr 2010)
- Ben Greear made telnet a lot better/easier to use by an application:

  The main change is to allow input from user-specified methods, when they are
  specified with CURLOPT_READFUNCTION.  All calls to fflush(stdout) in
  telnet.c were removed, which makes using 'curl telnet://foo.com' painful
  since prompts and other data are not always returned to the user promptly.
  Use 'curl --no-buffer telnet://foo.com' instead.  In general, the user
  should have their CURLOPT_WRITEFUNCTION do a fflush for interactive use.

  Also fix assumption that reading from stdin never returns < 0.
  Old code could crash in that case.

  Call progress functions in telnet main loop.

Daniel Stenberg (26 Apr 2010)
- Make use of the libssh2_init/exit functions that libssh2 added in version
  1.2.5. Using them will improve how libcurl works in threaded situations when
  SCP and SFTP are transfered.

Daniel Stenberg (25 Apr 2010)
- Based on work by Kamil Dudka, I've introduced the new configure option
  --enable-threaded-resolver. When used, the configure script will check for
  pthreads and if around, it will build libcurl to use pthreads to do name
  resolving in a threaded manner. Note that this is just a fix to offer an
  option that can enable the code that already included. The threader resolver
  code was mostly added on Jan 26 2010.

Daniel Stenberg (24 Apr 2010)
- Alex Bligh introduced the --proto and -proto-redir options that limit what
  protocols curl accepts for the requests and when following redirects.

Kamil Dudka (24 Apr 2010)
- Fixed test536 in order to not fail with threaded DNS resolver and tweaked
  comments in certain examples using curl_multi_fdset().

- Fixed SSL handshake timeout underflow in libcurl-NSS, which caused test405
  to hang on a slow machine.

Daniel Stenberg (21 Apr 2010)
- The -O option caused curl to crash on windows and DOS due to the tool
  writing out of boundary memory.

Yang Tse (20 Apr 2010)
- Ruslan Gazizov detected that MSVC makefiles were using wsock32.lib instead
  of ws2_32.lib, this generated linking issues on MSVC IPv6 enabled builds
  that were done using those makefiles.

Daniel Stenberg (19 Apr 2010)
- -J/--remote-header-name didn't strip trailing carriage returns or linefeeds
  properly, so they could be used in the file name.

Daniel Stenberg (16 Apr 2010)
- Jerome Vouillon made the GnuTLS SSL handshake phase non-blocking.

- The recent overhaul of the SSL recv function made the GnuTLS specific code
  treat a zero returned from gnutls_record_recv() as an error, and this caused
  our HTTPS test cases to fail. We leave it to upper layer code to detect if
  an EOF is a problem or not.

- I reverted the resolver fix from yesterday and instead removed all uses of
  AI_CANONNAME all over libcurl and made the only user of that info (krb5.c)
  use the host name from the URL instead. No reverse resolving is a good
  thing.

- Paul Howarth made configure properly detect GSS "on ancient Linux distros"
  by editing in which order we use headers to detect GSS.

Daniel Stenberg (15 Apr 2010)
- Rainer Canavan filed bug report #2987196 that identified libcurl doing
  unnecesary reverse name lookups in many cases when built to use IPv4 and
  getaddrinfo(). The logic for ipv6 is now used for ipv4 too.

  (http://curl.haxx.se/bug/view.cgi?id=2963679)

Version 7.20.1 (14 April 2010)

Daniel Stenberg (9 Apr 2010)
- Prefixing the FTP quote commands with an asterisk really only worked for the
  postquote actions. This is now fixed and test case 227 has been extended to
  verify.

Kamil Dudka (4 Apr 2010)
- Eliminated a race condition in Curl_resolv_timeout().

- Refactorized interface of Curl_ssl_recv()/Curl_ssl_send().

- libcurl-NSS now provides more accurate messages and error codes in case of
  client certificate problem.  Either during connection, or transfer phase.

Daniel Stenberg (1 Apr 2010)
- Matt Wixson found and fixed a bug in the SCP/SFTP area where the code
  treated a 0 return code from libssh2 to be the same as EAGAIN while in
  reality it isn't. The problem caused a hang in SFTP transfers from a
  MessageWay server.

Daniel Stenberg (28 Mar 2010)
- Ben Greear: If you pass a URL to pop3 that does not contain a message ID as
  part of the URL, it would previously ask for 'INBOX' which just causes the
  pop3 server to return an error.
    
  Now libcurl treats en empty message ID as a request for LIST (list of pop3
  message IDs).  User's code could then parse this and download individual
  messages as desired.

Daniel Stenberg (27 Mar 2010)
- Ben Greear brought a patch that from now on allows all protocols to specify
  name and user within the URL, in the same manner HTTP and FTP have been
  allowed to in the past - although far from all of the libcurl supported
  protocls actually have that feature in their URL definition spec.

Daniel Stenberg (26 Mar 2010)
- Ben Greear brought code that makes the rate limiting code for the easy
  interface a bit smoother as it introduces sub-second sleeps during it and it
  also takes the buffer sizes into account.

Daniel Stenberg (24 Mar 2010)
- Bob Richmond: There's an annoying situation where libcurl will read new HTTP
  response data from a socket, then check if it's a timeout if one is set. If
  the last packet received constitutes the end of the response body, libcurl
  still treats it as a timeout condition and reports a message like:

  "Operation timed out after 3000 milliseconds with 876 out of 876 bytes 
  received"

  It should only a timeout if the timer lapsed and we DIDN'T receive the end
  of the response body yet.

- Christopher Conroy fixed a problem with RTSP and GET_PARAMETER reported
  to us by Massimo Callegari. There's a new test case 572 that verifies this
  now.

- The 'ares' subtree has been removed from the source repository. It was
  always a separate project that sort of piggybacked on the curl project since
  the dawn of times and now the time has come for it to go stand on its own
  legs and continue living its own life. All details on c-ares and its new
  source code repository is found at http://c-ares.haxx.se/

Daniel Stenberg (23 Mar 2010)
- Kenny To filed the bug report #2963679 with patch to fix a problem he
  experienced with doing multi interface HTTP POST over a proxy using
  PROXYTUNNEL. He found a case where it would connect fine but bits.tcpconnect
  was not set correct so libcurl didn't work properly.

  (http://curl.haxx.se/bug/view.cgi?id=2963679)

- Akos Pasztory filed debian bug report #572276
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=572276 mentioning a problem
  with a resource that returns chunked-encoded _and_ with a Content-Length
  and libcurl failed to properly ignore the latter information.

- Hauke Duden provided an example program that made the multi interface crash.
  His example simply used the multi interface and did first one FTP transfer
  and after completion it used a second easy handle and did another FTP
  transfer on the same FTP server.

  This triggered a bug in the "delayed easy handle kill" system that curl
  uses: when an FTP connection is left alive it must keep an easy handle
  around internally - only for the purpose of having an easy handle when it
  later disconnects it. The code assumed that when the easy handle was removed
  and an internal reference was made, that version could be killed later on
  when a new easy handle came using the same connection. This was wrong as
  Hauke's example showed that the removed handle wasn't killed for real until
  later. This caused a double close attempt => segfault.

Daniel Stenberg (22 Mar 2010)
- Thomas Lopatic fixed the alarm()-based DNS timeout:

  Looking at the code of Curl_resolv_timeout() in hostip.c, I think that in
  case of a timeout, the signal handler for SIGALRM never gets removed. I
  think that in my case it gets executed at some point later on when execution
  has long left Curl_resolv_timeout() or even the cURL library.
  
  The code that is jumped to with siglongjmp() simply sets the error message
  to "name lookup timed out" and then returns with CURLRESOLV_ERROR. I guess
  that instead of simply returning without cleaning up, the code should have a
  goto that jumps to the spot right after the call to Curl_resolv().

Kamil Dudka (22 Mar 2010)
- Douglas Steinwand contributed a patch fixing insufficient initialization in
  Curl_clone_ssl_config()

Daniel Stenberg (21 Mar 2010)
- Ben Greear improved TFTP: the error code returning and the treatment
  of TSIZE == 0 when uploading.

- We've switched from CVS to git. See http://curl.haxx.se/source.html

Kamil Dudka (19 Mar 2010)
- Improved Curl_read() to not ignore the error returned from Curl_ssl_recv().

Daniel Stenberg (15 Mar 2010)
- Constantine Sapuntzakis brought a patch:

  The problem mentioned on Dec 10 2009
  (http://curl.haxx.se/bug/view.cgi?id=2905220) was only partially fixed.
  Partially because an easy handle can be associated with many connections in
  the cache (e.g. if there is a redirect during the lifetime of the easy
  handle).  The previous patch only cleaned up the first one. The new fix now
  removes the easy handle from all connections, not just the first one.

Daniel Stenberg (6 Mar 2010)
- Ben Greear brought a patch that fixed the rate limiting logic for TFTP when
  the easy interface was used.

Daniel Stenberg (5 Mar 2010)
- Daniel Johnson provided fixes for building curl with the clang compiler.

Yang Tse (5 Mar 2010)
- Constantine Sapuntzakis detected and fixed a double free in builds done
  with threaded resolver enabled (Windows default configuration) that would
  get triggered when a curl handle is closed while doing DNS resolution.

Daniel Stenberg (2 Mar 2010)
- [Daniel Johnson] I've been trying to build libcurl with clang on Darwin and
  ran into some issues with the GSSAPI tests in configure.ac. The tests first
  try to determine the include dirs and libs and set CPPFLAGS and LIBS
  accordingly. It then checks for the headers and finally sets LIBS a second
  time, causing the libs to be included twice. The first setting of LIBS seems
  redundant and should be left out, since the first part is otherwise just
  about finding headers.

  My second issue is that 'krb5-config --libs gssapi' on Darwin is less than
  useless and returns junk that, while it happens to work with gcc, causes
  clang to choke. For example, --libs returns $CFLAGS along with the libs,
  which is really retarded. Simply setting 'LIBS="$LIBS -lgssapi_krb5
  -lresolv"' on Darwin is sufficient.

- Based on patch provided by Jacob Moshenko, the transfer logic now properly
  makes sure that when using sub-second timeouts, there's no final bad 1000ms
  wait. Previously, a sub-second timeout would often make the elapsed time end
  up the time rounded up to the nearest second (e.g. 1s for 200ms timeout)

- Andrei Benea filed bug report #2956698 and pointed out that the
  CURLOPT_CERTINFO feature leaked memory due to a missing OpenSSL function
  call. He provided the patch to fix it too.

  http://curl.haxx.se/bug/view.cgi?id=2956698

- Markus Duft pointed out in bug #2961796 that even though Interix has a
  poll() function it doesn't quite work the way we want it so we must disable
  it, and he also provided a patch for it.

  http://curl.haxx.se/bug/view.cgi?id=2961796

- Made the pingpong timeout code properly deal with the response timeout AND
  the global timeout if set. Also, as was reported in the bug report #2956437
  by Ryan Chan, the time stamp to use as basis for the per command timeout was
  not set properly in the DONE phase for FTP (and not for SMTP) so I fixed
  that just now. This was a regression compared to 7.19.7 due to the
  conversion of FTP code over to the generic pingpong concepts.

  http://curl.haxx.se/bug/view.cgi?id=2956437

Daniel Stenberg (1 Mar 2010)
- Ben Greear provided an update for TFTP that fixes upload.

- Wesley Miaw reported bug #2958179 which identified a case of looping during
  OpenSSL based SSL handshaking even though the multi interface was used and
  there was no good reason for it.

  http://curl.haxx.se/bug/view.cgi?id=2958179

Daniel Stenberg (26 Feb 2010)
- Pat Ray in bug #2958474 pointed out an off-by-one case when receiving a
  chunked-encoding trailer.

  http://curl.haxx.se/bug/view.cgi?id=2958474

Daniel Fandrich (25 Feb 2010)
- Fixed a couple of out of memory leaks and a segfault in the SMTP & IMAP code.

Yang Tse (25 Feb 2010)
- I fixed bug report #2958074 indicating
  (http://curl.haxx.se/bug/view.cgi?id=2958074) that curl on Windows with
  option --trace-time did not use local time when timestamping trace lines.
  This could also happen on other systems depending on time souurce.

Patrick Monnerat (22 Feb 2010)
- Proper handling of STARTTLS on SMTP, taking CURLUSESSL_TRY into account.
- SMTP falls back to RFC821 HELO when EHLO fails (and SSL is not required).
- Use of true local host name (i.e.: via gethostname()) when available, as
  default argument to SMTP HELO/EHLO.
- Test case 804 for HELO fallback.

Daniel Stenberg (20 Feb 2010)
- Fixed the SMTP compliance by making sure RCPT TO addresses are specified
  properly in angle brackets. Recipients provided with CURLOPT_MAIL_RCPT now
  get angle bracket wrapping automatically by libcurl unless the recipient
  starts with an angle bracket as then the app is assumed to deal with that
  properly on its own.

- I made the SMTP code expect a 250 response back from the server after the
  full DATA has been sent, and I modified the test SMTP server to also send
  that response. As usual, the DONE operation that is made after a completed
  transfer is still not doable in a non-blocking way so this waiting for 250
  is unfortunately made blockingly.

Yang Tse (14 Feb 2010)
- Overhauled test suite getpart() function. Fixing potential out of bounds
  stack and memory overwrites triggered with huge test case definitions.

Daniel Stenberg (13 Feb 2010)
- Martin Hager reported and fixed a problem with a missing quote in libcurl.m4

  (http://curl.haxx.se/bug/view.cgi?id=2951319)

- Tom Donovan fixed the CURL_FORMAT_* defines when building with cmake.

  (http://curl.haxx.se/bug/view.cgi?id=2951269)

Daniel Stenberg (12 Feb 2010)
- Jack Zhang reported a problem with SMTP: we wrongly used multiple addresses
  in the same RCPT TO line, when they should be sent in separate single
  commands. I updated test case 802 to verify this.

- I also fixed a bad use of my_setopt_str() of CURLOPT_MAIL_RCPT in the curl
  tool which made it try to output it as string for the --libcurl feature
  which could lead to crashes.

Yang Tse (11 Feb 2010)
- Steven M. Schweda fixed VMS builder bad behavior when used in a batch job,
  removed obsolete batch_compile.com and defines.com and updated VMS readme.

Version 7.20.0 (9 February 2010)

Daniel Stenberg (9 Feb 2010)
- When downloading compressed content over HTTP and the app asked libcurl to
  automatically uncompress it with the CURLOPT_ENCODING option, libcurl could
  wrongly provide the callback with more data than the maximum documented
  amount. An application could thus get tricked into badness if the maximum
  limit was trusted to be enforced by libcurl itself (as it is documented).

  This is further detailed and explained in the libcurl security advisory
  20100209 at

    http://curl.haxx.se/docs/adv_20100209.html

Daniel Fandrich (3 Feb 2010)
- Changed the Watcom makefiles to make them easier to keep in sync with
  Makefile.inc since that can't be included directly.

Yang Tse (2 Feb 2010)
- Symbol CURL_FORMAT_OFF_T now obsoleted, will be removed in a future release,
  symbol will not be available when building with CURL_NO_OLDIES defined. Use
  of CURL_FORMAT_CURL_OFF_T is preferred since 7.19.0

Daniel Stenberg (1 Feb 2010)
- Using the multi_socket API, it turns out at times it seemed to "forget"
  connections (which caused a hang). It turned out to be an existing (7.19.7)
  bug in libcurl (that's been around for a long time) and it happened like
  this:

  The app calls curl_multi_add_handle() to add a new easy handle, libcurl will
  then set it to timeout in 1 millisecond so libcurl will tell the app about
  it.

  The app's timeout fires off that there's a timeout, the app calls libcurl as
  we so often document it:

  do {
   res = curl_multi_socket_action(... TIMEOUT ...);
  } while(CURLM_CALL_MULTI_PERFORM == res);

  And this is the problem number one:

  When curl_multi_socket_action() is called with no specific handle, but only
  a timeout-action, it will *only* perform actions within libcurl that are
  marked to run at this time. In this case, the request would go from INIT to
  CONNECT and return CURLM_CALL_MULTI_PERFORM. When the app then calls libcurl
  again, there's no timer set for this handle so it remains in the CONNECT
  state. The CONNECT state is a transitional state in libcurl so it reports no
  sockets there, and thus libcurl never tells the app anything more about that
  easy handle/connection.

  libcurl _does_ set a 1ms timeout for the handle at the end of
  multi_runsingle() if it returns CURLM_CALL_MULTI_PERFORM, but since the loop
  is instant the new job is not ready to run at that point (and there's no
  code that makes libcurl call the app to update the timout for this new
  timeout). It will simply rely on that some other timeout will trigger later
  on or that something else will update the timeout callback. This makes the
  bug fairly hard to repeat.

  The fix made to adress this issue:

  We introduce a loop in lib/multi.c around all calls to multi_runsingle() and
  simply check for CURLM_CALL_MULTI_PERFORM internally. This has the added
  benefit that this goes in line with my long-term wishes to get rid of the
  CURLM_CALL_MULTI_PERFORM all together from the public API.

  The downside of this fix, is that the counter we return in 'running_handles'
  in several of our public functions then gets a slightly new and possibly
  confusing behavior during times:

  If an app adds a handle that fails to connect (very quickly) it may just
  as well never appear as a 'running_handle' with this fix. Previously it
  would first bump the counter only to get it decreased again at next call.
  Even I have used that change in handle counter to signal "end of a
  transfer". The only *good* way to find the end of a individual transfer
  is calling curl_multi_info_read() to see if it returns one.

  Of course, if the app previously did the looping before it checked the
  counter, it really shouldn't be any new effect.

Yang Tse (26 Jan 2010)
- Constantine Sapuntzakis' and Joshua Kwan's work done in the last four months
  relative to the asynchronous DNS lookups, along with with some integration
  adjustments I have done are finally committed to CVS.

  Currently these enhancements will benefit builds done using c-ares on any
  platform as well as Windows builds using the default threaded resolver.

  This release does not make generally available POSIX threaded DNS lookups
  yet. There is no configure option to enable this feature yet. It is possible
  to experimantally try this feature running configure with compiler flags that
  make simultaneous definition of preprocessor symbols USE_THREADS_POSIX and
  HAVE_PTHREAD_H, as well as whatever reentrancy compiler flags and linker ones
  are required to link and properly use pthread_* functions on each platform.

Daniel Stenberg (26 Jan 2010)
- Mike Crowe made libcurl return CURLE_COULDNT_RESOLVE_PROXY when it is the
  proxy that cannot be resolved when using c-ares. This matches the behaviour
  when not using c-ares.

Björn Stenberg (23 Jan 2010)
- Added a new flag: -J/--remote-header-name. This option tells the
  -O/--remote-name option to use the server-specified Content-Disposition
  filename instead of extracting a filename from the URL.

Daniel Stenberg (21 Jan 2010)
- Chris Conroy brought support for RTSP transfers, and with it comes 8(!) new
  libcurl options for controlling what to get and how to receive posssibly
  interleaved RTP data.

Daniel Stenberg (20 Jan 2010)
- As was pointed out on the http-state mailing list, the order of cookies in a
  HTTP Cookie: header _needs_ to be sorted on the path length in the cases
  where two cookies using the same name are set more than once using
  (overlapping) paths. Realizing this, identically named cookies must be
  sorted correctly. But detecting only identically named cookies and take care
  of them individually is harder than just to blindly and unconditionally sort
  all cookies based on their path lengths. All major browsers also already do
  this, so this makes our behavior one step closer to them in the cookie area.

  Test case 8 was the only one that broke due to this change and I updated it
  accordingly.

Daniel Stenberg (19 Jan 2010)
- David McCreedy brought a fix and a new test case (129) to make libcurl work
  again when downloading files over FTP using ASCII and it turns out that the
  final size of the file is not the same as the initial size the server
  reported. This is very common since servers don't take the newline
  conversions into account.

Kamil Dudka (14 Jan 2010)
- Suppressed side effect of OpenSSL configure checks, which prevented NSS from
  being properly detected under certain circumstances. It had been caused by
  strange behavior of pkg-config when handling PKG_CONFIG_LIBDIR. pkg-config
  distinguishes among empty and non-existent environment variable in that case.

Daniel Stenberg (12 Jan 2010)
- Gil Weber reported a peculiar flaw with the multi interface when doing SFTP
  transfers: curl_multi_fdset() would return -1 and not set and file
  descriptors several times during a transfer of a single file. It turned out
  to be due to two different flaws now fixed. Gil's excellent recipe helped me
  nail this.

Daniel Stenberg (11 Jan 2010)
- Made sure that the progress callback is repeatedly called at a regular
  interval even during very slow connects.

- The tests/runtests.pl script now checks to see if the test case that runs is
  present in the tests/data/Makefile.am and outputs a notice message on the
  screen if not. Each test file has to be included in that Makefile.am to get
  included in release archives and forgetting to add files there is a common
  mistake. This is an attempt to make it harder to forget.

Daniel Stenberg (9 Jan 2010)
- Johan van Selst found and fixed a OpenSSL session ref count leak:

  ossl_connect_step3() increments an SSL session handle reference counter on
  each call. When sessions are re-used this reference counter may be
  incremented many times, but it will be decremented only once when done (by
  Curl_ossl_session_free()); and the internal OpenSSL data will not be freed
  if this reference count remains positive. When a session is re-used the
  reference counter should be corrected by explicitly calling
  SSL_SESSION_free() after each consecutive SSL_get1_session() to avoid
  introducing a memory leak.

  (http://curl.haxx.se/bug/view.cgi?id=2926284)

Daniel Stenberg (7 Jan 2010)
- Make sure the progress callback is called repeatedly even during very slow
  name resolves when c-ares is used for resolving.

Claes Jakobsson (6 Jan 2010)
- Julien Chaffraix fixed so that the fragment part in an URL is not sent
  to the server anymore.

Kamil Dudka (3 Jan 2010)
- Julien Chaffraix eliminated a duplicated initialization in singlesocket().

Daniel Stenberg (2 Jan 2010)
- Make curl support --ssl and --ssl-reqd instead of the previous FTP-specific
  versions --ftp-ssl and --ftp-ssl-reqd as these options are now used to
  control SSL/TLS for IMAP, POP3 and SMTP as well in addition to FTP. The old
  option names are still working but the new ones are the ones listed and
  documented.

Daniel Stenberg (1 Jan 2010)
- Ingmar Runge enhanced libcurl's FTP engine to support the PRET command. This
  command is a special "hack" used by the drftpd server, but even though it is
  a custom extension I've deemed it fine to add to libcurl since this server
  seems to survive and people keep using it and want libcurl to support
  it. The new libcurl option is named CURLOPT_FTP_USE_PRET, and it is also
  usable from the curl tool with --ftp-pret. Using this option on a server
  that doesn't support this command will make libcurl fail.

  I added test cases 1107 and 1108 to verify the functionality.

  The PRET command is documented at
  http://www.drftpd.org/index.php/Distributed_PASV

Yang Tse (30 Dec 2009)
- Steven M. Schweda improved VMS build system, and Craig A. Berry helped
  with the patch and testing.

Daniel Stenberg (26 Dec 2009)
- Renato Botelho and Peter Pentchev brought a patch that makes the libcurl
  headers work correctly even on FreeBSD systems before v8.

  (http://curl.haxx.se/bug/view.cgi?id=2916915)

Daniel Stenberg (17 Dec 2009)
- David Byron fixed Curl_ossl_cleanup to actually call ENGINE_cleanup when
  available.

- Follow-up fix for the proxy fix I did for Jon Nelson's bug. It turned out I
  was a bit too quick and broke test case 1101 with that change. The order of
  some of the setups is sensitive. I now changed it slightly again to make
  sure we do them in this order:

  1 - parse URL and figure out what protocol is used in the URL
  2 - prepend protocol:// to URL if missing
  3 - parse name+password off URL, which needs to know what protocol is used
      (since only some allows for name+password in the URL)
  4 - figure out if a proxy should be used set by an option
  5 - if no proxy option, check proxy environment variables
  6 - run the protocol-specific setup function, which needs to have the proxy
      already set

Daniel Stenberg (15 Dec 2009)
- Jon Nelson found a regression that turned out to be a flaw in how libcurl
  detects and uses proxies based on the environment variables. If the proxy
  was given as an explicit option it worked, but due to the setup order
  mistake proxies would not be used fine for a few protocols when picked up
  from '[protocol]_proxy'. Obviously this broke after 7.19.4. I now also added
  test case 1106 that verifies this functionality.

  (http://curl.haxx.se/bug/view.cgi?id=2913886)

Daniel Stenberg (12 Dec 2009)
- IMAP, POP3 and SMTP support and their TLS versions (including IMAPS, POP3S
  and SMTPS) are now supported. The current state may not yet be solid, but
  the foundation is in place and the test suite has some initial support for
  these protocols. Work will now persue to make them nice libcurl citizens
  until release.

  The work with supporting these new protocols was sponsored by
  networking4all.com - thanks!

Daniel Stenberg (10 Dec 2009)
- Siegfried Gyuricsko found out that the curl manual said --retry would retry
  on FTP errors in the transient 5xx range. Transient FTP errors are in the
  4xx range. The code itself only tried on 5xx errors that occured _at login_.
  Now the retry code retries on all FTP transfer failures that ended with a
  4xx response.

  (http://curl.haxx.se/bug/view.cgi?id=2911279)

- Constantine Sapuntzakis figured out a case which would lead to libcurl
  accessing alredy freed memory and thus crash when using HTTPS (with
  OpenSSL), multi interface and the CURLOPT_DEBUGFUNCTION and a certain order
  of cleaning things up. I fixed it.

  (http://curl.haxx.se/bug/view.cgi?id=2905220)

Daniel Stenberg (7 Dec 2009)
- Martin Storsjo made libcurl use the Expect: 100-continue header for posts
  with unknown size. Previously it was only used for posts with a known size
  larger than 1024 bytes.

Daniel Stenberg (1 Dec 2009)
- If the Expect: 100-continue header has been set by the application through
  curl_easy_setopt with CURLOPT_HTTPHEADER, the library should set
  data->state.expect100header accordingly - the current code (in 7.19.7 at
  least) doesn't handle this properly. Martin Storsjo provided the fix!

Yang Tse (28 Nov 2009)
- Added Diffie-Hellman parameters to several test harness certificate files in
  PEM format. Required by several stunnel versions used by our test harness.

Daniel Stenberg (28 Nov 2009)
- Markus Koetter provided a polished and updated version of Chad Monroe's TFTP
  rework patch that now integrates TFTP properly into libcurl so that it can
  be used non-blocking with the multi interface and more. BLKSIZE also works.

  The --tftp-blksize option was added to allow setting the TFTP BLKSIZE from
  the command line.

Daniel Stenberg (26 Nov 2009)
- Extended and fixed the change I did on Dec 11 for the the progress
  meter/callback during FTP command/response sequences. It turned out it was
  really lame before and now the progress meter SHOULD get called at least
  once per second.

Daniel Stenberg (23 Nov 2009)
- Bjorn Augustsson reported a bug which made curl not report any problems even
  though it failed to write a very small download to disk (done in a single
  fwrite call). It turned out to be because fwrite() returned success, but
  there was insufficient error-checking for the fclose() call which tricked
  curl to believe things were fine.

Yang Tse (23 Nov 2009)
- David Byron modified Makefile.dist vc8 and vc9 targets in order to allow
  finer granularity control when generating src and lib makefiles.

Yang Tse (22 Nov 2009)
- I modified configure to force removal of the curlbuild.h file included in
  distribution tarballs for use by non-configure systems. As intended, this
  would get overwriten when doing in-tree builds. But VPATH builds would end
  having two curlbuild.h files, one in the source tree and another in the
  build tree. With the modification I introduced 5 Nov 2009 this could become
  an issue when running libcurl's test suite.

Daniel Stenberg (20 Nov 2009)
- Constantine Sapuntzakis identified a write after close, as the sockets were
  closed by libcurl before the SSL lib were shutdown and they may write to its
  socket. Detected to at least happen with OpenSSL builds.

- Jad Chamcham pointed out a bug with connection re-use. If a connection had
  CURLOPT_HTTPPROXYTUNNEL enabled over a proxy, a subsequent request using the
  same proxy with the tunnel option disabled would still wrongly re-use that
  previous connection and the outcome would only be badness.

Yang Tse (18 Nov 2009)
- I modified the memory tracking system to make it intolerant with zero sized
  malloc(), calloc() and realloc() function calls.

Daniel Stenberg (17 Nov 2009)
- Constantine Sapuntzakis provided another fix for the DNS cache that could
  end up with entries that wouldn't time-out:

  1. Set up a first web server that redirects (307) to a http://server:port
     that's down
  2. Have curl connect to the first web server using curl multi

  After the curl_easy_cleanup call, there will be curl dns entries hanging
  around with in_use != 0.

  (http://curl.haxx.se/bug/view.cgi?id=2891591)

- Marc Kleine-Budde fixed: curl saved the LDFLAGS set during configure into
  its pkg-config file.  So -Wl stuff ended up in the .pc file, which is really
  bad, and breaks if there are multiple -Wl in our LDFLAGS (which are in
  PTXdist). bug #2893592 (http://curl.haxx.se/bug/view.cgi?id=2893592)

Kamil Dudka (15 Nov 2009)
- David Byron improved the configure script to use pkg-config to find OpenSSL
  (and in particular the list of required libraries) even if a path is given
  as argument to --with-ssl

Yang Tse (15 Nov 2009)
- I removed enable-thread / disable-thread configure option. These were only
  placebo options. The library is always built as thread safe as possible on
  every system.

Claes Jakobsson (14 Nov 2009)
- curl-config now accepts '--configure' to see what arguments was
  passed to the configure script when building curl.

Daniel Stenberg (14 Nov 2009)
- Claes Jakobsson restored the configure functionality to detect NSS when
  --with-nss is set but not "yes".

  I think we can still improve that to check for pkg-config in that path etc,
  but at least this patch brings back the same functionality we had before.

- Camille Moncelier added support for the file type SSL_FILETYPE_ENGINE for
  the client certificate. It also disable the key name test as some engines
  can select a private key/cert automatically (When there is only one key
  and/or certificate on the hardware device used by the engine)

Yang Tse (14 Nov 2009)
- Constantine Sapuntzakis provided the fix that ensures that an SSL connection
  won't be reused unless protection level for peer and host verification match.

  I refactored how preprocessor symbol _THREAD_SAFE definition is done.

Kamil Dudka (12 Nov 2009)
- Kevin Baughman provided a fix preventing libcurl-NSS from crash on doubly
  closed NSPR descriptor. The issue was hard to find, reported several times
  before and always closed unresolved. More info at the RH bug:
  https://bugzilla.redhat.com/534176

- libcurl-NSS now tries to reconnect with TLS disabled in case it detects
  a broken TLS server. However it does not happen if SSL version is selected
  manually. The approach was originally taken from PSM. Kaspar Brand helped me
  to complete the patch. Original bug reports:
  https://bugzilla.redhat.com/525496
  https://bugzilla.redhat.com/527771

Yang Tse (12 Nov 2009)
- I modified configure script to make the getaddrinfo function check also
  verify if the function is thread safe.

Yang Tse (11 Nov 2009)
- Marco Maggi reported that compilation failed when configured --with-gssapi
  and GNU GSS installed due to a missing mutual exclusion of header files in
  the Kerberos 5 code path. He also verified that my patch worked for him.

Daniel Stenberg (11 Nov 2009)
- Constantine Sapuntzakis posted bug #2891595
  (http://curl.haxx.se/bug/view.cgi?id=2891595) which identified how an entry
  in the DNS cache would linger too long if the request that added it was in
  use that long. He also provided the patch that now makes libcurl capable of
  still doing a request while the DNS hash entry may get timed out.

- Christian Schmitz noticed that the progress meter/callback was not properly
  used during the FTP connection phase (after the actual TCP connect), while
  it of course should be. I also made the speed check get called correctly so
  that really slow servers will trigger that properly too.

Kamil Dudka (5 Nov 2009)
- Dropped misleading timeouts in libcurl-NSS and made sure the SSL socket works
  in non-blocking mode.

Yang Tse (5 Nov 2009)
- I removed leading 'curl' path on the 'curlbuild.h' include statement in
  curl.h, adjusting auto-makefiles include path, to enhance portability to
  OS's without an orthogonal directory tree structure such as OS/400.

Daniel Stenberg (4 Nov 2009)
- I fixed several problems with the transfer progress meter. It showed the
  wrong percentage for small files, most notable for <1000 bytes and could
  easily end up showing more than 100% at the end. It also didn't show any
  percentage, transfer size or estimated transfer times when transferring
  less than 100 bytes.

Version 7.19.7 (4 November 2009)

Daniel Stenberg (2 Nov 2009)
- As reported independent by both Stan van de Burgt and Didier Brisebourg,
  CURLINFO_SIZE_DOWNLOAD (the -w variable size_download) didn't work when
  getting data from ldap!

Daniel Stenberg (31 Oct 2009)
- Gabriel Kuri reported a problem with CURLINFO_CONTENT_LENGTH_DOWNLOAD if the
  download was 0 bytes, as libcurl would then return the size as unknown (-1)
  and not 0. I wrote a fix and test case 566 to verify it.

Daniel Stenberg (30 Oct 2009)
- Liza Alenchery mentioned a problem with re-used SCP connection when a bad
  auth is used, as it caused a crash. I failed to repeat the issue, but still
  made a change that now forces the TCP connection used for a freed SCP
  session to get closed and not be re-used.

- "Tom" posted a bug report that mentioned how libcurl did wrong when doing a
  POST using a read callback, with Digest authentication and
  "Transfer-Encoding: chunked" enforced.  I would then cause the first request
  to be wrongly sent and then basically hang until the server closed the
  connection. I fixed the problem and added test case 565 to verify it.

Daniel Stenberg (25 Oct 2009)
- Dima Barsky made the curl cookie parser accept cookies even with blank or
  unparsable expiry dates and then treat them as session cookies - previously
  libcurl would reject cookies with a date format it couldn't parse. Research
  shows that the major browser treat such cookies as session cookies. I
  modified test 8 and 31 to verify this.

Daniel Stenberg (21 Oct 2009)
- Attempt to use pkg-config for finding out libssh2 installation details
  during configure.

- A patch in bug report #2883177 (http://curl.haxx.se/bug/view.cgi?id=2883177)
  by Johan van Selst introduced the --crlfile option to curl, which makes curl
  tell libcurl about a file with CRL (certificate revocation list) data to
  read.

Daniel Stenberg (18 Oct 2009)
- Ray Dassen provided a patch in Debian's bug tracker (bug number #551461)
  that now makes curl_getdate(3) actually handles RFC 822 formatted dates that
  use the "single letter military timezones".
  http://www.rfc-ref.org/RFC-TEXTS/822/chapter5.html has the details.

- Fixed memory leak in the SCP/SFTP code as it never freed the knownhosts
  data!

- John Dennis filed bug report #2873666
  (http://curl.haxx.se/bug/view.cgi?id=2873666) which identified a problem
  which made libcurl loop infinitely when given incorrect credentials when
  using HTTP GSS negotiate authentication. He also provided a small and simple
  patch for it.

- Kevin Baughman found a double close() problem with libcurl-NSS, as when
  libcurl called NSS to close the SSL "session" it also closed the actual
  socket.

Yang Tse (17 Oct 2009)
- Bug report #2866724 indicated