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libcares/CHANGES.0  view on Meta::CPAN

Version 1.4.0 (June 8, 2007)

* June 4 2007 (Daniel Stenberg)

- James Bursa reported a major memory problem when resolving multi-IP names
  and I found and fixed the problem. It was added by Ashish Sharma's patch
  two days ago.

  When I then tried to verify multiple entries in /etc/hosts after my fix, I
  got another segfault and decided this code was not ripe for inclusion and I
  reverted the patch.

* June 2 2007

- Brad Spencer found and fixed three flaws in the code, found with the new
  gcc 4.2.0 warning: -Waddress

- Brad House fixed VS2005 compiler warnings due to time_t being 64bit.
  He also made recent Microsoft compilers use _strdup() instead of strdup().

- Brad House's man pages for ares_save_options() and ares_destroy_options()
  were added.

- Ashish Sharma provided a patch for supporting multiple entries in the
  /etc/hosts file. Patch edited for coding style and functionality by me
  (Daniel).

* May 30 2007

- Shmulik Regev brought cryptographically secure transaction IDs:

  The c-ares library implementation uses a DNS "Transaction ID" field that is
  seeded with a pseudo random number (based on gettimeofday) which is
  incremented (++) between consecutive calls and is therefore rather
  predictable. In general, predictability of DNS Transaction ID is a well
  known security problem (e.g.
  http://bak.spc.org/dms/archive/dns_id_attack.txt) and makes a c-ares based
  implementation vulnerable to DNS poisoning. Credit goes to Amit Klein
  (Trusteer) for identifying this problem.

  The patch I wrote changes the implementation to use a more secure way of
  generating unique IDs. It starts by obtaining a key with reasonable entropy
  which is used with an RC4 stream to generate the cryptographically secure
  transaction IDs.

  Note that the key generation code (in ares_init:randomize_key) has two
  versions, the Windows specific one uses a cryptographically safe function
  provided (but undocumented :) by the operating system (described at
  http://blogs.msdn.com/michael_howard/archive/2005/01/14/353379.aspx).  The
  default implementation is a bit naive and uses the standard 'rand'
  function. Surely a better way to generate random keys exists for other
  platforms.

  The patch can be tested by using the adig utility and using the '-s' option.

- Brad House added ares_save_options() and ares_destroy_options() that can be
  used to keep options for later re-usal when ares_init_options() is used.

  Problem: Calling ares_init() for each lookup can be unnecessarily resource
         intensive.  On windows, it must LoadLibrary() or search the registry
         on each call to ares_init().  On unix, it must read and parse
         multiple files to obtain the necessary configuration information.  In
         a single-threaded environment, it would make sense to only
         ares_init() once, but in a heavily multi-threaded environment, it is
         undesirable to ares_init() and ares_destroy() for each thread created
         and track that.

  Solution: Create ares_save_options() and ares_destroy_options() functions to
         retrieve and free options obtained from an initialized channel.  The
         options populated can be used to pass back into ares_init_options(),
         it should populate all needed fields and not retrieve any information
         from the system.  Probably wise to destroy the cache every minute or
         so to prevent the data from becoming stale.

- Daniel S added ares_process_fd() to allow applications to ask for processing
  on specific sockets and thus avoiding select() and associated
  functions/macros.  This function will be used by upcoming libcurl releases
  for this very reason. It also made me export the ares_socket_t type in the
  public ares.h header file, since ares_process_fd() uses that type for two of
  the arguments.

* May 25 2007

- Ravi Pratap fixed a flaw in the init_by_resolv_conf() function for windows
  that could cause it to return a bad return code.

* April 16 2007

- Yang Tse: Provide ares_getopt() command-line parser function as a source
  code helper function, not belonging to the actual c-ares library.

* February 19 2007

- Vlad Dinulescu added ares_parse_ns_reply().

* February 13 2007

- Yang Tse: Fix failure to get the search sequence of /etc/hosts and
  DNS from /etc/nsswitch.conf, /etc/host.conf or /etc/svc.conf when
  /etc/resolv.conf did not exist or was unable to read it.

* November 22 2006

- Install ares_dns.h too

- Michael Wallner fixed this problem: When I set domains in the options
  struct, and there are domain/search entries in /etc/resolv.conf, the domains
  of the options struct will be overridden.

* November 6 2006

- Yang Tse removed a couple of potential zero size memory allocations.

- Andreas Rieke fixed the line endings in the areslib.dsp file that I (Daniel)
  broke in the 1.3.2 release. We should switch to a system where that file is
  auto-generated. We could rip some code for that from curl...

Version 1.3.2 (November 3, 2006)

* October 12 2006

libcares/CHANGES.0  view on Meta::CPAN

  NUL-terminate the expanded name. The old behavior failed to NUL-terminate if
  len was 0, and this was causing strlen() to run past the end of the buffer
  after calling ares_expand_name() and getting ARES_SUCCESS as the return
  value. If q is not greater than *s then it's equal and *s is always
  allocated with at least one byte.

* May 16

- Added ares_getnameinfo which mimics the getnameinfo API (another feature
  that could use testing).

* May 14

- Added an inet_ntop function from BIND for systems that do not have it.

* April 9

- Made sortlist support IPv6 (this can probably use some testing).

- Made sortlist support CIDR matching for IPv4.

* April 8

- Added preliminary IPv6 support to ares_gethostbyname. Currently, sortlist
  does not work with IPv6. Also provided an implementation of bitncmp from
  BIND for systems that do not supply this function. This will be used to add
  IPv6 support to sortlist.

- Made ares_gethostbyaddr support IPv6 by specifying AF_INET6 as the family.
  The function can lookup IPv6 addresses both from files (/etc/hosts) and
  DNS lookups.

* April 7

- Tupone Alfredo fixed includes of arpa/nameser_compat.h to build fine on Mac
  OS X.

* April 5

- Dominick Meglio: Provided implementations of inet_net_pton and inet_pton
  from BIND for systems that do not include these functions.

* March 11, 2005

- Dominick Meglio added ares_parse_aaaa_reply.c and did various
  adjustments. The first little steps towards IPv6 support!

* November 7

- Fixed the VC project and makefile to use ares_cancel and ares_version

* October 24

- The released ares_version.h from 1.2.1 says 1.2.0 due to a maketgz flaw.
  This is now fixed.

Version 1.2.1 (October 20, 2004)

* September 29

- Henrik Stoerner fix: got a report that Tru64 Unix (the unix from Digital
  when they made Alpha's) uses /etc/svc.conf for the purpose fixed below for
  other OSes. He made c-ares check for and understand it if present.

- Now c-ares will use local host name lookup _before_ DNS resolving by default
  if nothing else is told.

* September 26

- Henrik Stoerner: found out that c-ares does not look at the /etc/host.conf
  file to determine the sequence in which to search /etc/hosts and DNS.  So on
  systems where this order is defined by /etc/host.conf instead of a "lookup"
  entry in /etc/resolv.conf, c-ares will always default to looking in DNS
  first, and /etc/hosts second.

  c-ares now looks at

  1) resolv.conf (for the "lookup" line);
  2) nsswitch.fon (for the "hosts:" line);
  3) host.conf (for the "order" line).

  First match wins.

- Dominick Meglio patched: C-ares on Windows assumed that the HOSTS file is
  located in a static location. It assumed
  C:\Windows\System32\Drivers\Etc. This is a poor assumption to make. In fact,
  the location of the HOSTS file can be changed via a registry setting.

  There is a key called DatabasePath which specifies the path to the HOSTS
  file:
  http://www.microsoft.com/technet/itsolutions/network/deploy/depovg/tcpip2k.mspx

  The patch will make c-ares correctly consult the registry for the location
  of this file.

* August 29

- Gisle Vanem fixed the MSVC build files.

* August 20

- Gisle Vanem made c-ares build and work with his Watt-32 TCP/IP stack.

* August 13

- Harshal Pradhan made a minor syntax change in ares_init.c to make it build
  fine with MSVC 7.1

* July 24

- Made the lib get built static only if --enable-debug is used.

- Gisle Vanem fixed:

  Basically in loops like handle_errors(), 'query->next' was assigned a local
  variable and then query was referenced after the memory was freed by
  next_server(). I've changed that so next_server() and end_query() returns
  the next query. So callers should use this ret-value.

  The next problem was that 'server->tcp_buffer_pos' had a random value at
  entry to 1st recv() (luckily causing Winsock to return ENOBUFS).