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path: root/libc/inet/resolv.c
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2007-02-02fix lock namingEric Andersen
2007-02-02Ronald Maeder writes:Eric Andersen
Hi Erik, Thanks for all your great work. I found a set of bugs in resolv.c . Basically, there is code that looks like: BIGLOCK; __nameserversXX=__nameservers; __nameserverXX=__nameserver; BIGUNLOCK; i = __dns_lookup(dname, type, __nameserversXX, __nameserverXX, &packet, &a); which is a problem because the declarations are int __nameservers; char * __nameserver[MAX_SERVERS]; int __searchdomains; char * __searchdomain[MAX_SEARCH]; so you can see that __nameserver is a pointer. Copying the pointer to __nameserverXX doesn't protect the global variable space. I have attached a patch and the new file. I hope you will incorporate these bug fixes. I spent quite a bit of time tracking them down. Many thanks, Ron
2007-02-02fix obvious bug in ipv4/ipv6 resolving. When not using AF_INET,Eric Andersen
gethostbyname2_r tries to resolve an ipv6 address from /etc/hosts using get_hosts_byname_r, but with AF_INET instead of the supplied address family. This returns ipv4 addresses marked as ipv6 ones. Fix from nbd.
2006-12-08__resolv_lock is supposed to be shared, not static Eric Andersen
2006-12-07Major cleanup of internal mutex locking. Be more consistant in how we doEric Andersen
things, and avoid potential deadlocks caused when a thread holding a uClibc internal lock get canceled and terminates without releasing the lock. This change also provides a single place, bits/uClibc_mutex.h, for thread libraries to modify to change all instances of internal locking.
2006-07-31fix h_alias handling in gethostbyaddr_r() just like in gethostbyname_r()Mike Frysinger
otherwise we get messed up alias memory and this simple test case will segfault: python -c 'import socket; print socket.gethostbyaddr("80.68.88.204")[2];' see bug report in blackfin tracker for more info: http://blackfin.uclinux.org/tracker/index.php?func=detail&aid=1503&group_id=17&atid=141
2006-03-23select needs sys/select.h, str[n]casecmp/ffs needs strings.h, if BSD is not ↵Peter S. Mazinger
defined, gettimeofday has other prototype and tm_gmtoff/tm_zone do not exist
2006-03-22Correct build if UCLIBC_HAS_CTYPE_TABLES is not definedPeter S. Mazinger
2006-03-10Remove all non-constant libc_hidden_data_def(), it is too unreliable, sorry, ↵Peter S. Mazinger
most of global data relocations are back
2006-02-01global data uses libc_hidden_data_def, convert all -I hope- and add some newPeter S. Mazinger
2006-01-26Get rid of missing prototype warningsPeter S. Mazinger
2006-01-16Last relocs jump and global data, (even locales) that I could remove are ↵Peter S. Mazinger
gone from libc. The remaining are left as exercise for others ;-)
2006-01-16some global data relocs gonePeter S. Mazinger
2006-01-14make DODEBUG=y happy, update sysdeps/common/* copyrightPeter S. Mazinger
2006-01-14hidden_def/hidden_proto: convert all users (I hope) termios split, add some ↵Peter S. Mazinger
missing headers, other jump relocs removed
2006-01-08hide internal symbolsMike Frysinger
2005-12-16Convert some users and get rid of __rpc_thread_createerr jump reloc, this ↵Peter S. Mazinger
was indeed a badly chosen name
2005-12-09Implement hidden poll, switch user to hidden *printf/*scanf/pollPeter S. Mazinger
2005-12-08mmap/mremap/socket/rewind gonePeter S. Mazinger
2005-12-08Convert the rest of users to hiddenPeter S. Mazinger
2005-12-08Again rpc ;-( , all *inet*, *addr*Peter S. Mazinger
2005-12-07Hide morePeter S. Mazinger
2005-12-06Make use internal str*casecmp/wcscollPeter S. Mazinger
2005-12-06macro out the thread funcs in libc if threading is disabledMike Frysinger
2005-12-03Rename newly created __libc_x (reserved for libpthread overwrites) w/ ↵Peter S. Mazinger
x_internal, do not use cascading aliases
2005-12-03More hiding, including __mempcpyPeter S. Mazinger
2005-12-01Hide mostly used functionsPeter S. Mazinger
2005-11-29Hiding againPeter S. Mazinger
2005-11-27Hide some of mem* and str*Peter S. Mazinger
2005-11-26100 JUMP relocs less (remaining 431) by hiding internally used onesPeter S. Mazinger
2005-11-26Some more hidden internalsPeter S. Mazinger
2005-10-20Better solution to duplicate locking definesPeter S. Mazinger
2005-10-20Change in_addr_t inet_aton to int, glibc has it as int and uClibc uses it in ↵Peter S. Mazinger
addr.c also as int. Rename mylock/LOCK/UNLOCK in resolv.c to allow IMA compiling
2005-05-10The default static buffer sizes are too small to handle the 8 entries returnedEric Andersen
by 'nslookup www.yahoo.com' and 'nslookup mail.hotmail.com', and thus we currently return ERANGE when trying to lookup some of the most popular hosts on the planet. Whether these sites deserve to be popular is a question I'll leave for someone else to worry about. This change makes certain we have enough static buffer space to handle about 21 IPv4 IP address replies per DNS query. Far more than enough to handle common cases such as www.yahoo.com and mail.hotmail.com.
2005-04-28Fix it so uClibc returns multiple ips via h_addr_list,Eric Andersen
This fix, based on this patch http://bugs.uclibc.org/view.php?id=104 makes it so uClibc fills out round robin dns lists for applications such as nslookup: Before: $ nslookup google.com Server: mace.codepoet.org Address: 10.10.10.1 Name: google.com Address: 216.239.39.99 After: $ nslookup google.com Server: mace.codepoet.org Address: 10.10.10.1 Name: google.com Addresses: 216.239.57.99, 216.239.37.99, 216.239.39.99
2005-04-28Cleanup error case a bitEric Andersen
2005-04-28This might actually now be thread safe, assuming I havn't broken it.Eric Andersen
2005-04-28trim trailing whitespaceEric Andersen
2005-01-11Jan Lana writes:Eric Andersen
uClibc resolver doesn't lookup all search domains. For example, if you have computer 'jenda.prague.my.cz' and resolv.conf: search my.cz nameserver xx.xx.xx.xx try this: ping jenda.prague.my.cz #works ping jenda.prague #unknown host libc/inet/resolv.c doesn't want to try search domains if the domain name contains '.'. I don't find any reason for the behaviour in literature and it is inconsistent with the glibc. Patch is attached. regards, - jenda
2004-09-07Implement gethostent_rEric Andersen
2004-09-07Remove stale leftoversEric Andersen
2004-08-15Do not fail all lookups when /etc/resolv.conf is missing, as i.e.Eric Andersen
checking on 127.0.0.1 is still valid w/o resolv.conf -Erik
2004-08-14req_search returned garbage. This teaches it to behave itself andEric Andersen
return the length and the actual dns packet as received, rather than making stuff up. -Erik
2004-08-10On Monday 02 August 2004 08:44 am, Mike Frysinger wrote:Manuel Novoa III
> the gethostbyname_r() call itself is not segfaulting, but the memory > returned in the h_aliases array seems to be wrong ... was playing around with the source today and eventually the obvious answer hit me ... while read_etc_hosts_r() generatings an array of strings fo h_aliases and populates it, the dns path does not :) find attached a patch that'll actually generate the h_aliases list in the normal dns code path ... i used the etc_hosts_r() code as a template for some of it ... note that this is just a simple fix ... it fills the alias list with just the hostname gethostbyname_r was passed ... the proper fix i think would be to parse the dns packet down in __dns_lookup() and pass the info back via the resolv_answer struct ... but this fix is better than the current state of things ... that is, h_aliases currently is never initailized in the dns code path :)
2004-03-10Bug fix: gethostbyname2_r would fail if /etc/host was missing.Manuel Novoa III
Bug fix: gethostbyname_r checked errno without first setting it to a known value.
2004-01-24Imre Sunyi writes:Eric Andersen
Hi Erik I have corrected a bug in uClibc/libc/inet/resolv.c in function __dns_lookup(). Have attaced a txt file with my diffs regarding to uClibc 0.9.26. If two nameservers are included in /etc/resolv.conf and the first one is wrong and the secondary is correct the algorithm never looked up the secondary one. Please review my diff and feel free to submit the patch onto your CVS. If reading manual page resolv.conf(5) under nameserver and how the algorithm should work the previous dns_lookup did not fully followed that. Regards Imre Sunyi
2004-01-04Implement res_search and res_querydomain based on netbsd code,Eric Andersen
but remove support for host aliases (the HOSTALIASES env variable) which looks like a very bad idea. -Erik
2003-12-27Fix a long-standing bug with pthreads. A couple of linuxthreads filesManuel Novoa III
were including libc-lock.h which had a bunch of weak pragmas. Also, uClibc supplied a number of no-op weak thread functions even though many weren't needed. This combined result was that sometimes the functional versions of thread functions in pthread would not override the weaks in libc. While fixing this, I also prepended double-underscore to all necessary weak thread funcs in uClibc, and removed all unused weaks. I did a test build, but haven't tested this since these changes are a backport from my working tree. I did test the changes there and no longer need to explicitly add -lpthread in the perl build for perl to pass its thread self tests.
2003-10-19We were failing to properly set h_errno on success, which couldEric Andersen
cause gethostbyaddr_r to keep looping allocating more and more memory each time till alloca finally caused a segfault. Ugh. This fixes that as well... -Erik
2003-10-15Patch from Tony J. White:Eric Andersen
I've created a patch for adding dn_expand() to uClibc 0.9.21. dn_expand() is used by at least ipsec-tools and also openldap I think.
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