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2012-04-01improve name lookup performance in corner casesRich Felker2-2/+2
the buffer in getaddrinfo really only matters when /etc/hosts is huge, but in that case, the huge number of syscalls resulting from a tiny buffer would seriously impact the performance of every name lookup. the buffer in __dns.c has also been enlarged a bit so that typical resolv.conf files will fit fully in the buffer. there's no need to make it so large as to dominate the syscall overhead for large files, because resolv.conf should never be large.
2012-02-23fix for previous incorrect fix of cancellation in dns lookupsRich Felker1-3/+4
uninitialized file descriptor was being closed on return, causing stdin to be closed in many cases.
2012-02-11fix default nameserver when resolv.conf doesn't existRich Felker1-1/+2
2012-02-11fix illegal goto out of cleanup context in dns lookupsRich Felker1-3/+3
2011-09-21make dns lookups (and thus getaddrinfo) cancellableRich Felker1-4/+11
2011-09-21use poll rather than select in dns lookups (also clock_gettime)Rich Felker1-12/+10
if the file descriptor resource limit has been increased past FD_SETSIZE, this is actually a security issue; we could write past the end of the fd_set object. using poll makes it a non-issue, and simplifies the code at the same time. also, use clock_gettime instead of gettimeofday, for reduced bloat and better entropy.
2011-09-13remove some stray trailing space charactersRich Felker2-2/+2
2011-08-03implement if_nameindex and if_freenameindexRich Felker2-0/+65
2011-08-01fix wrong messages in gai_strerrorRich Felker1-0/+2
i had missed the fact that a couple values were unassigned...
2011-08-01port numbers should always be interpreted as decimalRich Felker1-1/+1
per POSIX and RFC 3493: If the specified address family is AF_INET, AF_INET6, or AF_UNSPEC, the service can be specified as a string specifying a decimal port number. 021 is a valid decimal number, therefore, interpreting it as octal seems to be non-conformant.
2011-07-12"implement" getnetbyaddr and getnetbynameRich Felker1-0/+12
these are useless legacy functions but some old software contains cruft that expects them to exist...
2011-06-30res_search symbol, aliased to res_query for now (better than nothing)Rich Felker1-0/+3
2011-04-25fix bug in ipv6 parsing that prevented parsing a lone "::"Rich Felker1-4/+1
2011-04-25ipv6 parsing code (formerly dummied-out)Rich Felker2-8/+62
2011-04-21fix bogus return values for inet_ptonRich Felker1-2/+2
2011-04-20disallow blank strings as service or host nameRich Felker1-0/+3
2011-04-20fix bugs in ipv4 parsingRich Felker1-1/+2
2011-04-18dns lookups: protect against cancellation and fix incorrect error codesRich Felker1-4/+10
2011-04-17overhaul pthread cancellationRich Felker6-28/+6
this patch improves the correctness, simplicity, and size of cancellation-related code. modulo any small errors, it should now be completely conformant, safe, and resource-leak free. the notion of entering and exiting cancellation-point context has been completely eliminated and replaced with alternative syscall assembly code for cancellable syscalls. the assembly is responsible for setting up execution context information (stack pointer and address of the syscall instruction) which the cancellation signal handler can use to determine whether the interrupted code was in a cancellable state. these changes eliminate race conditions in the previous generation of cancellation handling code (whereby a cancellation request received just prior to the syscall would not be processed, leaving the syscall to block, potentially indefinitely), and remedy an issue where non-cancellable syscalls made from signal handlers became cancellable if the signal handler interrupted a cancellation point. x86_64 asm is untested and may need a second try to get it right.
2011-04-12optimize ntohl etc. in terms of bswap functionsRich Felker4-20/+12
we can do this without violating the namespace now that they are macros/inline functions rather than extern functions. the motivation is that gcc was generating giant, slow, horrible code for the old functions, and now generates a single byte-swapping instruction.
2011-04-08workaround broken msghdr struct on 64bit linuxRich Felker2-0/+21
POSIX clearly specifies the type of msg_iovlen and msg_controllen, and Linux ignores it and makes them both size_t instead. to work around this we add padding (instead of just using the wrong types like glibc does), but we also need to patch-up the struct before passing it to the kernel in case the caller did not zero-fill it. if i could trust the kernel to just ignore the upper 32 bits, this would not be necessary, but i don't think it will ignore them...
2011-04-08fix ipv6 address printing: 2001 appeared as 201, etc.Rich Felker1-3/+5
2011-04-08fix broken dns response parsing code that made most ipv6 lookups failRich Felker1-4/+6
2011-04-08return the requested string as the "canonical name" for numeric addressesRich Felker1-0/+1
previously NULL was returned in ai_canonname, resulting in crashes in some callers. this behavior was incorrect. note however that the new behavior differs from glibc, which performs reverse dns lookups. POSIX is very clear that a reverse DNS lookup must not be performed for numeric addresses.
2011-04-07fix uninitialized variables in dns lookup codeRich Felker1-2/+2
2011-04-06add _res (__res_state()) dummyRich Felker1-0/+9
2011-04-05implement if_indextoname and if_nametoindex functionsRich Felker2-0/+36
2011-03-25fix all implicit conversion between signed/unsigned pointersRich Felker1-1/+1
sadly the C language does not specify any such implicit conversion, so this is not a matter of just fixing warnings (as gcc treats it) but actual errors. i would like to revisit a number of these changes and possibly revise the types used to reduce the number of casts required.
2011-02-15cleanup socketcall syscall interface to ease porting to sane(r) archsRich Felker19-94/+17
2011-02-14another pointer signedness fixRich Felker1-1/+1
2011-02-12initial check-in, version 0.5.0v0.5.0Rich Felker55-0/+1570