CVS log for src/lib/libc/resolv/res_init.c

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Pull up following revision(s) (requested by christos in ticket #1356):

	lib/libc/resolv/res_init.c: revision 1.32
	lib/libc/resolv/res_private.h: revision 1.4

kqueue(2) file descriptors are not inherited across fork(2). A
process that that calls getaddrinfo(3) will end up cacheing the
kqueue(2) file descriptor in its res_state structure. If that
process fork(2)s and calls getaddrinfo(3) again might end up closing
that cached file descriptor which can end up pointing to a different
file object than the kqueue(2) original one. To fix this, associate
the kqueue(2) file descriptor with the process id that created it,
and don't close(2) it if it is being closed from a different process.

An alternative fix would be to attach the resolver to a fork(2) hook
to cleanup the res_state, but handling it internally in the resolver
is less intrusive. This was discovered by Dima Veselov when using
the FreeRADIUS package.

kqueue(2) file descriptors are not inherited across fork(2). A
process that that calls getaddrinfo(3) will end up cacheing the
kqueue(2) file descriptor in its res_state structure. If that
process fork(2)s and calls getaddrinfo(3) again might end up closing
that cached file descriptor which can end up pointing to a different
file object than the kqueue(2) original one. To fix this, associate
the kqueue(2) file descriptor with the process id that created it,
and don't close(2) it if it is being closed from a different process.
An alternative fix would be to attach the resolver to a fork(2) hook
to cleanup the res_state, but handling it internally in the resolver
is less intrusive. This was discovered by Dima Veselov when using
the FreeRADIUS package.

Sync with HEAD

Sync with HEAD

F_DUPFD* needs an argument (minfd) found by jmcneill

belated removal of the advertising clause.

Mark the dup of the resolv fd for close on exec.

Rebase to HEAD as of a few days ago.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

provide a patchable __res_conf_name for testing purposes.

Fix typo ("then" instead of "than")

sync with head

add a check-names option, now that the default is no-check-names

sync with head

Use C89 Prototypes.
Remove use of __P

PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values to types that
  would not fit.
- change types, add casts
- change into ansii prototypes
- turn on _DIAGNOSTIC for libc (during current, to be eliminated for release
  builds)

approved by core@

close on exec fixes:
- open + fcntl -> open O_CLOEXEC
- configuration database file descriptors that can stay open are now opened
  fopen(db, "re")

Pull up following revision(s) (requested by taca in ticket #1429):
	lib/libc/resolv/res_init.c:	revisions 1.11, 1.12 via patch
Don't check for ext being NULL to destroy the res_state. Instead check
the option bits like we did before.
Only try free-ing a version of res if it is not supposed to be pre-inited
like before. Fixes issues with programs passing random uninitialized data
as res_state.

Apply patch, requested by spz in ticket 1413:
	dist/bind/							patch
	include/resolv.h						patch
	include/arpa/nameser.h:						patch
	lib/libc/include/isc/assertions.h:				patch
	lib/libc/include/isc/eventlib.h					patch
	lib/libc/isc/assertions.c:					patch
	lib/libc/nameser/ns_parse.c					patch
	lib/libc/resolv/herror.c:					patch
	lib/libc/resolv/res_init.c					patch
	lib/libc/resolv/res_mkquery.c:					patch
	lib/libc/resolv/res_query.c					patch
	lib/libc/resolv/res_send.c:					patch
	usr.sbin/bind/Makefile.inc					patch
	usr.sbin/bind/include/config.h:					patch
	usr.sbin/bind/include/dns/code.h:				patch
	usr.sbin/bind/include/dns/enumclass.h:				patch
	usr.sbin/bind/include/dns/enumtype.h:				patch
	usr.sbin/bind/include/dns/rdatastruct.h:			patch
	usr.sbin/bind/include/isc/platform.h:				patch
	usr.sbin/bind/include/lwres/netdb.h:				patch
	usr.sbin/bind/include/lwres/platform.h:				patch
	usr.sbin/bind/libisc/Makefile:					patch
	lib/libc/inet/inet_addr.c 					new file

Update bind to  9.4-ESV-R4, latest version of the 9.4 line.

Apply patch, requested by spz in ticket 1413:
	dist/bind/							patch
	include/resolv.h						patch
	include/arpa/nameser.h:						patch
	lib/libc/include/isc/assertions.h:				patch
	lib/libc/include/isc/eventlib.h					patch
	lib/libc/isc/assertions.c:					patch
	lib/libc/nameser/ns_parse.c					patch
	lib/libc/resolv/herror.c:					patch
	lib/libc/resolv/res_init.c					patch
	lib/libc/resolv/res_mkquery.c:					patch
	lib/libc/resolv/res_query.c					patch
	lib/libc/resolv/res_send.c:					patch
	usr.sbin/bind/Makefile.inc					patch
	usr.sbin/bind/include/config.h:					patch
	usr.sbin/bind/include/dns/code.h:				patch
	usr.sbin/bind/include/dns/enumclass.h:				patch
	usr.sbin/bind/include/dns/enumtype.h:				patch
	usr.sbin/bind/include/dns/rdatastruct.h:			patch
	usr.sbin/bind/include/isc/platform.h:				patch
	usr.sbin/bind/include/lwres/netdb.h:				patch
	usr.sbin/bind/include/lwres/platform.h:				patch
	usr.sbin/bind/libisc/Makefile:					patch
	lib/libc/inet/inet_addr.c 					new file

Update bind to  9.4-ESV-R4, latest version of the 9.4 line.

Apply patches (requested by spz in ticket #1517):

Update bind to 9.7.2-P3.

Apply patches (requested by spz in ticket #1517):

Update bind to 9.7.2-P3.

Apply patches (requested by spz in ticket #1517):

Update bind to 9.7.2-P3.

expose res_check.

Add a knote to keep track when resolv.conf gets changed and re-initialize.
While here fix a memory leak when calling res_vinit with an already inited
res_state.

Sync with HEAD.

Third (and last) commit. See http://mail-index.netbsd.org/source-changes/2009/05/13/msg221222.html

Bring back binary compatibility with the previous version of the resolver.
There was no room to allocate 16 bytes for _rnd in the struct in the _LP64
case, so we dynamically allocate now. Also put the _rnd field last, so that
we are bitwise compatible too. Now of course we've run out of space, so
next time will need to perform more evil tricks to fit.

we are not guaranteed that the ext pointer is going to be null at this point
so don't attempt to free.

fix lint issues and actual bugs lint found (missing break statements)

merge libbind and bump.

libc portion of libbind from external/bsd/libbind

merge christos-time_t

time_t changes

Sync w/ -current. 34 merge conflicts to follow.

file res_init.c was added on branch christos-time_t on 2008-11-08 21:45:38 +0000

- protect DEBUG again because we should be able to set it from the Makefile
- add a missing cast to pacify lint.

updates from bind-9-5-0

Catch up with now-somewhat-dated netbsd-4. These changes took longer
than expected for me to actually get around to merging.

Add missing BIND 9.4.x include file and library changes (requested by
tron in ticket #662).

Update BIND to version 9.4.1 (requested by christos in ticket #602).
Thanks to tron for the patches, upgrade script and testing.

Resolve conflicts.

Import bind 9.4.0.

Only try free-ing a version of res if it is not supposed to be pre-inited
like before. Fixes issues with programs passing random uninitialized data
as res_state.

Don't check for ext being NULL to destroy the res_state. Instead check
the option bits like we did before.

Fix minor compilation issues.

merge in resolver portion of bind-9.4.0-rc2

import resolver portion of bind-9.4.0-rc2

Coverity CID 618: Comment out dead code.

don't re-define DEBUG

Rest of fix for PR#31184: getaddrinfo() now honors resolv.conf sortlist
directive for dns answers.

Also, unifdef the RESLVSORT (non-)option sillyness.

Reviewed by christos.

disable weak aliases for now; the resolver header file adds __ to all the
names.

namespace protection for resolver routines.

netbsd rcsid.

add casts to silence lint.

Import libc portion of the resolver from bind9

Initial revision