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94162d62ac
function init_id_key() under low memory conditions.
613 lines
22 KiB
Plaintext
613 lines
22 KiB
Plaintext
Changelog for the c-ares project
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* October 2 2007 (Daniel Stenberg)
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- ares_strerror() segfaulted if the input error number was out of the currently
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supported range.
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- Yang Tse: Avoid a segfault when generating a DNS "Transaction ID" in
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internal function init_id_key() under low memory conditions.
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* September 28 2007 (Daniel Stenberg)
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- Bumped version to 1.5.0 for next release and soname bumped to 2 due to ABI
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and API changes in the progress callback (and possibly more coming up from
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Steinar)
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* September 28 2007 (Steinar H. Gunderson)
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- Don't skip a server if it's the only one. (Bugfix from the Google tree.)
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- Made the query callbacks receive the number of timeouts that happened during
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the execution of a query, and updated documentation accordingly. (Patch from
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the Google tree.)
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- Support a few more socket options: ARES_OPT_SOCK_SNDBUF and
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ARES_OPT_SOCK_RCVBUF
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- Always register for TCP events even if there are no outstanding queries, as
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the other side could always close the connection, which is a valid event
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which should be responded to.
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* September 22 2007 (Daniel Stenberg)
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- Steinar H. Gunderson fixed: Correctly clear sockets from the fd_set on in
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several functions (write_tcp_data, read_tcp_data, read_udp_packets) so that
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if it fails and the socket is closed the following code doesn't try to use
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the file descriptor.
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- Steinar H. Gunderson modified c-ares to now also do to DNS retries even when
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TCP is used since there are several edge cases where it still makes sense.
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- Brad House provided a fix for ares_save_options():
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Apparently I overlooked something with the ares_save_options() where it
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would try to do a malloc(0) when no options of that type needed to be saved.
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On most platforms, this was fine because malloc(0) doesn't actually return
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NULL, but on AIX it does, so ares_save_options would return ARES_ENOMEM.
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* July 14 2007 (Daniel Stenberg)
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- Vlad Dinulescu fixed two outstanding valgrind reports:
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1. In ares_query.c , in find_query_by_id we compare q->qid (which is a short
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int variable) with qid, which is declared as an int variable. Moreover,
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DNS_HEADER_SET_QID is used to set the value of qid, but DNS_HEADER_SET_QID
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sets only the first two bytes of qid. I think that qid should be declared as
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"unsigned short" in this function.
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2. The same problem occurs in ares_process.c, process_answer() . query->qid
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(an unsigned short integer variable) is compared with id, which is an
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integer variable. Moreover, id is initialized from DNS_HEADER_QID which sets
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only the first two bytes of id. I think that the id variable should be
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declared as "unsigned short" in this function.
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Even after declaring these variables as "unsigned short", the valgrind
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errors are still there. Which brings us to the third problem.
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3. The third problem is that Valgrind assumes that query->qid is not
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initialised correctly. And it does that because query->qid is set from
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DNS_HEADER_QID(qbuf); Valgrind says that qbuf has unitialised bytes. And
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qbuf has uninitialised bytes because of channel->next_id . And next_id is
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set by ares_init.c:ares__generate_new_id() . I found that putting short r=0
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in this function (instead of short r) makes all Valgrind warnings go away.
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I have studied ares__rc4() too, and this is the offending line:
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buffer_ptr[counter] ^= state[xorIndex]; (ares_query.c:62)
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This is what triggers Valgrind.. buffer_ptr is unitialised in this function,
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and by applying ^= on it, it remains unitialised.
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Version 1.4.0 (June 8, 2007)
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* June 4 2007 (Daniel Stenberg)
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- James Bursa reported a major memory problem when resolving multi-IP names
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and I found and fixed the problem. It was added by Ashish Sharma's patch
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two days ago.
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When I then tried to verify multiple entries in /etc/hosts after my fix, I
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got another segfault and decided this code was not ripe for inclusion and I
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reverted the patch.
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* June 2 2007
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- Brad Spencer found and fixed three flaws in the code, found with the new
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gcc 4.2.0 warning: -Waddress
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- Brad House fixed VS2005 compiler warnings due to time_t being 64bit.
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He also made recent Microsoft compilers use _strdup() instead of strdup().
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- Brad House's man pages for ares_save_options() and ares_destroy_options()
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were added.
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- Ashish Sharma provided a patch for supporting multiple entries in the
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/etc/hosts file. Patch edited for coding style and functionality by me
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(Daniel).
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* May 30 2007
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- Shmulik Regev brought cryptographically secure transaction IDs:
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The c-ares library implementation uses a DNS "Transaction ID" field that is
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seeded with a pseudo random number (based on gettimeofday) which is
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incremented (++) between consecutive calls and is therefore rather
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predictable. In general, predictability of DNS Transaction ID is a well
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known security problem (e.g.
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http://bak.spc.org/dms/archive/dns_id_attack.txt) and makes a c-ares based
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implementation vulnerable to DNS poisoning. Credit goes to Amit Klein
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(Trusteer) for identifying this problem.
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The patch I wrote changes the implementation to use a more secure way of
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generating unique IDs. It starts by obtaining a key with reasonable entropy
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which is used with an RC4 stream to generate the cryptographically secure
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transaction IDs.
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Note that the key generation code (in ares_init:randomize_key) has two
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versions, the Windows specific one uses a cryptographically safe function
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provided (but undocumented :) by the operating system (described at
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http://blogs.msdn.com/michael_howard/archive/2005/01/14/353379.aspx). The
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default implementation is a bit naive and uses the standard 'rand'
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function. Surely a better way to generate random keys exists for other
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platforms.
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The patch can be tested by using the adig utility and using the '-s' option.
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- Brad House added ares_save_options() and ares_destroy_options() that can be
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used to keep options for later re-usal when ares_init_options() is used.
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Problem: Calling ares_init() for each lookup can be unnecessarily resource
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intensive. On windows, it must LoadLibrary() or search the registry
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on each call to ares_init(). On unix, it must read and parse
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multiple files to obtain the necessary configuration information. In
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a single-threaded environment, it would make sense to only
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ares_init() once, but in a heavily multi-threaded environment, it is
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undesirable to ares_init() and ares_destroy() for each thread created
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and track that.
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Solution: Create ares_save_options() and ares_destroy_options() functions to
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retrieve and free options obtained from an initialized channel. The
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options populated can be used to pass back into ares_init_options(),
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it should populate all needed fields and not retrieve any information
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from the system. Probably wise to destroy the cache every minute or
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so to prevent the data from becoming stale.
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- Daniel S added ares_process_fd() to allow applications to ask for processing
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on specific sockets and thus avoiding select() and associated
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functions/macros. This function will be used by upcoming libcurl releases
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for this very reason. It also made me export the ares_socket_t type in the
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public ares.h header file, since ares_process_fd() uses that type for two of
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the arguments.
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* May 25 2007
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- Ravi Pratap fixed a flaw in the init_by_resolv_conf() function for windows
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that could cause it to return a bad return code.
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* April 16 2007
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- Yang Tse: Provide ares_getopt() command-line parser function as a source
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code helper function, not belonging to the actual c-ares library.
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* February 19 2007
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- Vlad Dinulescu added ares_parse_ns_reply().
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* February 13 2007
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- Yang Tse: Fix failure to get the search sequence of /etc/hosts and
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DNS from /etc/nsswitch.conf, /etc/host.conf or /etc/svc.conf when
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/etc/resolv.conf did not exist or was unable to read it.
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* November 22 2006
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- Install ares_dns.h too
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- Michael Wallner fixed this problem: When I set domains in the options
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struct, and there are domain/search entries in /etc/resolv.conf, the domains
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of the options struct will be overridden.
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* November 6 2006
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- Yang Tse removed a couple of potential zero size memory allocations.
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- Andreas Rieke fixed the line endings in the areslib.dsp file that I (Daniel)
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broke in the 1.3.2 release. We should switch to a system where that file is
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auto-generated. We could rip some code for that from curl...
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Version 1.3.2 (November 3, 2006)
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* October 12 2006
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- Prevent ares_getsock() to overflow if more than 16 sockets are used.
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* September 11 2006
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- Guilherme Balena Versiani: I noted a strange BUG in Win32 port
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(ares_init.c/get_iphlpapi_dns_info() function): when I disable the network
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by hand or disconnect the network cable in Windows 2000 or Windows XP, my
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application gets 127.0.0.1 as the only name server. The problem comes from
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'GetNetworkParams' function, that returns the empty string "" as the only
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name server in that case. Moreover, the Windows implementation of
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inet_addr() returns INADDR_LOOPBACK instead of INADDR_NONE.
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* August 29 2006
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- Brad Spencer did
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o made ares_version.h use extern "C" for c++ compilers
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o fixed compiler warnings in ares_getnameinfo.c
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o fixed a buffer position init for TCP reads
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* August 3 2006
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- Ravi Pratap fixed ares_getsock() to actually return the proper bitmap and
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not always zero!
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Version 1.3.1 (June 24, 2006)
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* July 23, 2006
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- Gisle Vanem added getopt() to the ahost program. Currently accepts
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only [-t {a|aaaa}] to specify address family in ares_gethostbyname().
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* June 19, 2006
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- (wahern) Removed "big endian" DNS section and RR data integer parser
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macros from ares_dns.h, which break c-ares on my Sparc64. Bit-wise
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operations in C operate on logical values. And in any event the octets are
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already in big-endian (aka network) byte order so they're being reversed
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(thus the source of the breakage).
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* June 18, 2006
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- William Ahern handles EAGAIN/EWOULDBLOCK errors in most of the I/O calls
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from area_process.c.
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TODO: Handle one last EAGAIN for a UDP socket send(2) in
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ares__send_query().
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* May 10, 2006
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- Bram Matthys brought my attention to a libtool peculiarity where detecting
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things such as C++ compiler actually is a bad thing and since we don't need
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that detection I added a work-around, much inspired by a previous patch by
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Paolo Bonzini. This also shortens the configure script quite a lot.
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* May 3, 2006
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- Nick Mathewson added the ARES_OPT_SOCK_STATE_CB option that when set makes
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c-ares call a callback on socket state changes. A better way than the
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ares_getsock() to get full control over the socket state.
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* January 9, 2006
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- Alexander Lazic improved the getservbyport_r() configure check.
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* January 6, 2006
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- Alexander Lazic pointed out that the buildconf should use the ACLOCAL_FLAGS
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variable for easier controlling what it does and how it runs.
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* January 5, 2006
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- James Bursa fixed c-ares to find the hosts file on RISC OS, and made it
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build with newer gcc versions that no longer defines "riscos".
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* December 22
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- Daniel Stenberg added ares_getsock() that extracts the set of sockets to
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wait for action on. Similar to ares_fds() but not restricted to using
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select() for the waiting.
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* November 25
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- Yang Tse fixed some send() / recv() compiler warnings
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* September 18
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- Added constants that will be used by ares_getaddrinfo
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- Made ares_getnameinfo use the reentrant getservbyport (getservbyport_r) if it
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is available to ensure it works properly in a threaded environment.
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* September 10
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- configure fix for detecting a member in the sockaddr_in6 struct which failed
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on ipv6-enabled HP-UX 11.00
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Version 1.3.0 (August 29, 2005)
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* August 21
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- Alfredo Tupone provided a fix for the Windows code in get_iphlpapi_dns_info()
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when getting the DNS server etc.
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* June 19
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- Added some checks for the addrinfo structure.
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* June 2
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- William Ahern:
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Make UDP sockets non-blocking. I've confirmed that at least on Linux 2.4 a
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read event can come back from poll() on a valid SOCK_DGRAM socket but
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recv(2) will still block. This patch doesn't ignore EAGAIN in
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read_udp_packets(), though maybe it should. (This patch was edited by Daniel
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Stenberg and a new configure test was added (imported from curl's configure)
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to properly detect what non-blocking socket approach to use.)
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I'm not quite sure how this was happening, but I've been seeing PTR queries
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which seem to return empty responses. At least, they were empty when calling
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ares_expand_name() on the record. Here's a patch which guarantees to
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NUL-terminate the expanded name. The old behavior failed to NUL-terminate if
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len was 0, and this was causing strlen() to run past the end of the buffer
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after calling ares_expand_name() and getting ARES_SUCCESS as the return
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value. If q is not greater than *s then it's equal and *s is always
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allocated with at least one byte.
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* May 16
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- Added ares_getnameinfo which mimics the getnameinfo API (another feature
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that could use testing).
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* May 14
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- Added an inet_ntop function from BIND for systems that do not have it.
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* April 9
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- Made sortlist support IPv6 (this can probably use some testing).
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- Made sortlist support CIDR matching for IPv4.
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* April 8
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- Added preliminary IPv6 support to ares_gethostbyname. Currently, sortlist
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does not work with IPv6. Also provided an implementation of bitncmp from
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BIND for systems that do not supply this function. This will be used to add
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IPv6 support to sortlist.
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- Made ares_gethostbyaddr support IPv6 by specifying AF_INET6 as the family.
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The function can lookup IPv6 addresses both from files (/etc/hosts) and
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DNS lookups.
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* April 7
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- Tupone Alfredo fixed includes of arpa/nameser_compat.h to build fine on Mac
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OS X.
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* April 5
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- Dominick Meglio: Provided implementations of inet_net_pton and inet_pton
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from BIND for systems that do not include these functions.
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* March 11, 2005
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- Dominick Meglio added ares_parse_aaaa_reply.c and did various
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adjustments. The first little steps towards IPv6 support!
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* November 7
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- Fixed the VC project and makefile to use ares_cancel and ares_version
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* October 24
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- The released ares_version.h from 1.2.1 says 1.2.0 due to a maketgz flaw.
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This is now fixed.
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Version 1.2.1 (October 20, 2004)
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* September 29
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- Henrik Stoerner fix: got a report that Tru64 Unix (the unix from Digital
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when they made Alpha's) uses /etc/svc.conf for the purpose fixed below for
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other OSes. He made c-ares check for and understand it if present.
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- Now c-ares will use local host name lookup _before_ DNS resolving by default
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if nothing else is told.
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* September 26
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- Henrik Stoerner: found out that c-ares does not look at the /etc/host.conf
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file to determine the sequence in which to search /etc/hosts and DNS. So on
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systems where this order is defined by /etc/host.conf instead of a "lookup"
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entry in /etc/resolv.conf, c-ares will always default to looking in DNS
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first, and /etc/hosts second.
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c-ares now looks at
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1) resolv.conf (for the "lookup" line);
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2) nsswitch.fon (for the "hosts:" line);
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3) host.conf (for the "order" line).
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First match wins.
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- Dominick Meglio patched: C-ares on Windows assumed that the HOSTS file is
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located in a static location. It assumed
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C:\Windows\System32\Drivers\Etc. This is a poor assumption to make. In fact,
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the location of the HOSTS file can be changed via a registry setting.
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There is a key called DatabasePath which specifies the path to the HOSTS
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file:
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http://www.microsoft.com/technet/itsolutions/network/deploy/depovg/tcpip2k.mspx
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The patch will make c-ares correctly consult the registry for the location
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of this file.
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* August 29
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- Gisle Vanem fixed the MSVC build files.
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* August 20
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- Gisle Vanem made c-ares build and work with his Watt-32 TCP/IP stack.
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* August 13
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- Harshal Pradhan made a minor syntax change in ares_init.c to make it build
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fine with MSVC 7.1
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* July 24
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- Made the lib get built static only if --enable-debug is used.
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- Gisle Vanem fixed:
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Basically in loops like handle_errors(), 'query->next' was assigned a local
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variable and then query was referenced after the memory was freed by
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next_server(). I've changed that so next_server() and end_query() returns
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the next query. So callers should use this ret-value.
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The next problem was that 'server->tcp_buffer_pos' had a random value at
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entry to 1st recv() (luckily causing Winsock to return ENOBUFS).
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I've also added a ares_writev() for Windows to streamline the code a bit
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more.
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* July 20
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- Fixed a few variable return types for some system calls. Made configure
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check for ssize_t to make it possible to use that when receiving the send()
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error code. This is necessary to prevent compiler warnings on some systems.
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- Made configure create config.h, and all source files now include setup.h that
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might include the proper config.h (or a handicrafted alternative).
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- Switched to 'ares_socket_t' type for sockets in ares, since Windows don't
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use 'int' for that.
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- automake-ified and libool-ified c-ares. Now it builds libcares as a shared
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lib on most platforms if wanted. (This bloated the size of the release
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archive with another 200K!)
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- Makefile.am now uses Makefile.inc for the c sources, h headers and man
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pages, to make it easier for other makefiles to use the exact same set of
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files.
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- Adjusted 'maketgz' to use the new automake magic when building distribution
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archives.
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- Anyone desires HTML and/or PDF versions of the man pages in the release
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archives?
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* July 3
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- G<>nter Knauf made c-ares build and run on Novell Netware.
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* July 1
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- Gisle Vanem provided Makefile.dj to build with djgpp, added a few more djgpp
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fixes and made ares not use 'errno' to provide further info on Windows.
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* June 30
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- Gisle Vanem made it build with djgpp and run fine with the Watt-32 stack.
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* June 10
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- Gisle Vanem's init patch for Windows:
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The init_by_resolv_conf() function fetches the DNS-server(s)
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from a series of registry branches.
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This can be wrong in the case where DHCP has assigned nameservers, but the
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||
user has overridden these servers with other prefered settings. Then it's
|
||
wrong to use the DHCPNAMESERVER setting in registry.
|
||
|
||
In the case of no global DHCP-assigned or fixed servers, but DNS server(s)
|
||
per adapter, one has to query the adapter branches. But how can c-ares know
|
||
which adapter is valid for use? AFAICS it can't. There could be one adapter
|
||
that is down (e.g. a VPN adapter).
|
||
|
||
So it's better to leave this to the IP Helper API (iphlapi) available in
|
||
Win-98/2000 and later. My patch falls-back to the old way if not available.
|
||
|
||
* June 8
|
||
- James Bursa fixed an init issue for RISC OS.
|
||
|
||
* May 11
|
||
- Nico Stappenbelt reported that when processing domain and search lines in
|
||
the resolv.conf file, the first entry encountered is processed and used as
|
||
the search list. According to the manual pages for both Linux, Solaris and
|
||
Tru64, the last entry of either a domain or a search field is used.
|
||
|
||
This is now adjusted in the code
|
||
|
||
Version 1.2.0 (April 13, 2004)
|
||
|
||
* April 2, 2004
|
||
- Updated various man pages to look nicer when converted to HTML on the web
|
||
site.
|
||
|
||
* April 1, 2004
|
||
- Dirk Manske provided a new function that is now named ares_cancel(). It is
|
||
used to cancel/cleanup a resolve/request made using ares functions on the
|
||
given ares channel. It does not destroy/kill the ares channel itself.
|
||
|
||
- Dominick Meglio cleaned up the formatting in several man pages.
|
||
|
||
* March 30, 2004
|
||
- Dominick Meglio's new ares_expand_string. A helper function when decoding
|
||
incoming DNS packages.
|
||
|
||
- Daniel Stenberg modified the Makefile.in to use a for loop for the man page
|
||
installation to improve overview and make it easier to add man pages.
|
||
|
||
Version 1.1.0 (March 11, 2004)
|
||
|
||
* March 9, 2004
|
||
- Gisle Vanem improved build on Windows.
|
||
|
||
* February 25, 2004
|
||
- Dan Fandrich found a flaw in the Feb 22 fix.
|
||
|
||
- Added better configure --enable-debug logic (taken from the curl configure
|
||
script). Added acinclude.m4 to the tarball.
|
||
|
||
* February 23, 2004
|
||
- Removed ares_free_errmem(), the function, the file and the man page. It was
|
||
not used and it did nothing.
|
||
|
||
- Fixed a lot of code that wasn't "64bit clean" and thus caused a lot of
|
||
compiler warnings on picky compilers.
|
||
|
||
* February 22, 2004
|
||
- Dominick Meglio made ares init support multiple name servers in the
|
||
NameServer key on Windows.
|
||
|
||
* February 16, 2004
|
||
- Modified ares_private.h to include libcurl's memory debug header if
|
||
CURLDEBUG is set. This makes all the ares-functions supervised properly by
|
||
the curl test suite. This also forced me to add inclusion of the
|
||
ares_private.h header in a few more files that are using some kind of
|
||
memory-related resources.
|
||
|
||
- Made the makefile only build ahost and adig if 'make demos' is used.
|
||
|
||
* February 10, 2004
|
||
- Dirk Manske made ares_version.h installed with 'make install'
|
||
|
||
* February 4, 2004
|
||
- ares_free_errmem() is subject for removal, it is simply present for future
|
||
purposes, and since we removed the extra parameter in strerror() it won't
|
||
be used by c-ares!
|
||
- configure --enable-debug now enables picky compiler options if gcc is used
|
||
- fixed several compiler warnings --enable-debug showed and Joerg Mueller-Tolk
|
||
reported
|
||
|
||
Version 1.0.0 (February 3, 2004)
|
||
|
||
* February 3, 2004
|
||
- now we produce the libcares.a library instead of the previous libares.a
|
||
since we are no longer compatible
|
||
|
||
* February 2, 2004
|
||
|
||
- ares_strerror() has one argument less. This is the first official
|
||
modification of the existing provided ares API.
|
||
|
||
* January 29, 2004
|
||
|
||
- Dirk Manske fixed how the socket is set non-blocking.
|
||
|
||
* January 4, 2004
|
||
|
||
- Dominick Meglio made the private gettimeofday() become ares_gettimeofday()
|
||
instead in order to not pollute the name space and risk colliding with
|
||
other libraries' versions of this function.
|
||
|
||
* October 24, 2003. Daniel Stenberg
|
||
|
||
Added ares_version().
|
||
|
||
Version 1.0-pre1 (8 October 2003)
|
||
|
||
- James Bursa made it run on RISC OS
|
||
|
||
- Dominick Meglio made it run fine on NT4
|
||
|
||
- Duncan Wilcox made it work fine on Mac OS X
|
||
|
||
- Daniel Stenberg adjusted the windows port
|
||
|
||
- liren at vivisimo.com made the initial windows port
|
||
|
||
* Imported the sources from ares 1.1.1
|