Commit Graph

37 Commits

Author SHA1 Message Date
vangyzen
60458e70da resolver: automatically reload /etc/resolv.conf
On each resolver query, use stat(2) to see if the modification time
of /etc/resolv.conf has changed.  If so, reload the file and reinitialize
the resolver library.  However, only call stat(2) if at least two seconds
have passed since the last call to stat(2), since calling it on every
query could kill performance.

This new behavior is enabled by default.  Add a "reload-period" option
to disable it or change the period of the test.

Document this behavior and option in resolv.conf(5).

Polish the man page just enough to appease igor.

https://lists.freebsd.org/pipermail/freebsd-arch/2015-October/017342.html

Reviewed by:	kp, wblock
Discussed with:	jilles, imp, alfred
MFC after:	1 month
Relnotes:	yes
Sponsored by:	Dell Inc.
Differential Revision:	https://reviews.freebsd.org/D3867
2015-10-14 14:26:44 +00:00
ume
228ba577ee Update our stub resolver to final version of libbind.
Obtained from:	ISC
2014-08-12 12:36:06 +00:00
uqs
c1face1449 Spelling fixes for include/ 2012-01-07 16:10:15 +00:00
imp
7d79e30fb2 Remove the Berkeley clause 3's.
Add a few $FreeBSD$
2010-02-16 19:39:50 +00:00
ume
5981f7a689 Merge the resolver part of BIND 9.4.3 into HEAD.
It includes the following fix:

  2426.   [bug]           libbind: inet_net_pton() can sometimes return the
                          wrong value if excessively large netmasks are
                          supplied. [RT #18512]

Reported by:	Maksymilian Arciemowicz <cxib__at__securityreason.com>
2008-12-14 19:39:53 +00:00
ume
1f0b78cb3e Merge BIND 9.4.1 into main chunk.
MFC after:	2 weeks
2007-06-03 17:20:27 +00:00
ume
2103e7a60f Upgrade res_update(3) and the friends to BIND9's one excluding TSIG
support.

X-MFC after:	never
2006-05-21 11:19:36 +00:00
ume
18f5285192 Comment out the function prototypes which our libc actually
doesn't have.
2006-05-13 12:43:12 +00:00
ume
b09a8950a1 Update the resolver in libc to BIND9's one.
Since, res_sendsigned(3) and the friends use MD5 functions, it is
hard to include them without having MD5 functions in libc.  So,
res_sendsigned(3) is not merged into libc.

Since, res_update(3) in BIND9 is not binary compatible with our
res_update(3), res_update(3) is leaved as is, except some
necessary modifications.
The res_update(3) and the friends are not essential part of the
resolver.  They are not defined in resolv.h but defined in
res_update.h separately in BIND9.  Further, they are not called from
our tree.  So, I hide them from our resolv.h, but leave them only
for binary backward compatibility (perhaps, no one calls them).

Since, struct __res_state_ext is not exposed in BIND9, I hide it
from our resolv.h.  And, global variable _res_ext is removed.  It
breaks binary backward compatibility.  But, since it is not used from
outside of our libc, I think it is safe.

Reviewed by:	arch@ (no objection)
2006-03-21 16:11:11 +00:00
ume
fbf57fcf0e Decrease the value of RES_DFLRETRY from 4 to 2.
PR:		bin/62139
Reported by:	Rostislav Krasny <rosti.bsd__at__gmail.com>
Obtained from:	BIND9
MFC after:	1 week
2006-02-24 17:00:50 +00:00
stefanf
871b20e6ea Don't declare ___res_ext() twice. 2005-09-12 15:53:28 +00:00
yar
e1618f7fe2 Add the macro RES_DFLRETRY long-promised by resolver(5).
It specifies the default number of retries per a name server.
This makes the code consistent with the manpage and allows to
kill another constant in res_init.c that should have been a
#define'd parameter.  (This appears to be a case when the manpage
was better than the code, so the latter was to be fixed.)

PR:	bin/62139 (in the audit trail)
2004-09-09 17:39:47 +00:00
des
a52d3498dd Don't try to pass off a struct sockaddr as a struct sockaddr_in when it
may in fact very well be a struct sockaddr_in6.  Just use plain struct
sockaddr.

This brings us yet another step closer to a clean -O2 build.
2004-03-15 17:08:28 +00:00
green
40452493ee Make the resolver(3) and many associated interfaces much more reentrant.
The getaddrinfo(3), getipnodebyname(3) and resolver(3) can coincide now
with what should be totally reentrant, and h_errno values will now
be preserved correctly, but this does not affect interfaces such as
gethostbyname(3) which are still mostly non-reentrant.

In all of these relevant functions, the thread-safety has been pushed
down as far as it seems possible right now.  This means that operations
that are selected via nsdispatch(3) (i.e. files, yp, dns) are protected
still under global locks that getaddrinfo(3) defines, but where possible
the locking is greatly reduced.  The most noticeable improvement is
that multiple DNS lookups can now be run at the same time, and this
shows major improvement in performance of DNS-lookup threaded programs,
and solves the "Mozilla tab serialization" problem.

No single-threaded applications need to be recompiled.  Multi-threaded
applications that reference "_res" to change resolver(3) options will
need to be recompiled, and ones which reference "h_errno" will also
if they desire the correct h_errno values.  If the applications already
understood that _res and h_errno were not thread-safe and had their own
locking, they will see no performance improvement but will not
actually break in any way.

Please note that when NSS modules are used, or when nsdispatch(3)
defaults to adding any lookups of its own to the individual libc
_nsdispatch() calls, those MUST be reentrant as well.
2004-02-25 21:03:46 +00:00
murray
93b87ff9b0 Add support for timeout: and attempts: resolver options.
Submitted by:	Paul Vixie <paul@vix.com> / ISC
MFC After:	1 week
2003-12-07 12:32:24 +00:00
nectar
0d65b541d4 Eliminate 19 warnings in libc (at level WARNS=2) of the
`implicit declaration of function' variety.
2003-02-27 13:40:01 +00:00
imp
300518c0a1 Breath deep and take __P out of the system include files.
# This appears to not break X11, but I'm having problems compiling the
# glide part of the server with or without this patch, so I can't tell
# for sure.
2002-03-23 17:24:55 +00:00
ume
32dc912feb Implement EDNS0 support, as EDNS0 support will be made mandatory for
IPv6 transport-ready resolvers/DNS servers.  Need careful configuration
when enable it. (default config is not affected).
See manpage for details.

XXX visible symbol __res_opt() is added, however, it is not supposed to be
called from outside, libc minor is not bumped.

Obtained from:	KAME/NetBSD
2001-06-10 20:25:24 +00:00
shin
8c2ccb59ca Getaddrinfo(), getnameinfo(), and etc support in libc/net.
Several udp and raw apps IPv6 support.

Reviewed by: freebsd-arch, cvs-committers
Obtained from: KAME project
1999-12-28 02:37:14 +00:00
peter
d4e3ebaf0a $Id$ -> $FreeBSD$ 1999-08-27 23:45:13 +00:00
brian
a56985289c Remove the extern decl of ``h_errno''. It's already
externed in netdb.h - where all of its #define values
live.  If anything requires h_errno here (nothing in
/usr/src seems to) it's almost definitely broken.
1998-09-07 19:54:08 +00:00
peter
ccb2399663 Damn, bind8 includes added <arpa/nameser.h> as a prerequisite for
<resolv.h>.  This breaks user ppp at least, and goodness knows how
many ports. :-(

This a bit of a hack, but is probably simpler than duplicating the
typedefs and protecting them from each other.

Also, remove some temporary XXX notes that I forgot to remove before.
1998-06-11 12:52:45 +00:00
peter
f8f1d6e80f Update nameserver interface to bind-8.1.2 levels. We do not use IRS (yet?)
since it has far wider impact than hostname lookups (including passwords).
Note that this has more ugly symbol hiding and binary compatability hacks
that can go away the second we bump majors.

Obtained from:  Mostly from diff against ISC bind-8.1.2 sources
1998-06-11 08:55:17 +00:00
brian
a059b2e7c8 Add "options no_tld_query" to resolv.conf.
Mention the capability in resolver(5).
Mention that RES_OPTIONS can be used in resolver(5).
Discussed with: -hackers
1997-09-01 01:19:23 +00:00
peter
43ce060734 merge in bind-4.9.6 changes (only effect is __res_send #define reverted) 1997-06-27 08:32:38 +00:00
eivind
1ab5f06651 Back out all of yesterdays include file changes. 1997-05-07 20:01:10 +00:00
eivind
379be4bd69 Make a lot of include-files self-contained. I excluded the patches changing
int's to gid_t and uid_t - should I commit these, too?

Closes PR misc/2625.

Submitted by:	Julian Assange <proff@iq.org>
1997-05-07 02:27:18 +00:00
peter
f173325ac8 Revert $FreeBSD$ to $Id$ 1997-02-23 09:21:14 +00:00
jkh
808a36ef65 Make the long-awaited change from $Id$ to $FreeBSD$
This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore.  This update would have been
insane otherwise.
1997-01-14 07:20:47 +00:00
peter
648aae194f Update the resolver definitions from bind-4.9.4-P1 to 4.9.5-P1 level.
(More commits to come)
1996-12-30 13:08:54 +00:00
peter
d971f8ba30 Hand merge in the bind-4.9.4-P1 resolver updates. 1996-08-29 20:01:00 +00:00
mpp
d6779c281f Fix a bunch of spelling errors in the comment fields
of a bunch of system include files.
1996-01-30 23:33:04 +00:00
peter
dde8b2c549 Update resolver include files to bind-4.9.3-rel level 1996-01-07 05:01:52 +00:00
peter
2dd1919d1c Update the resolver include files to bind-4.9.3-beta24 level (from beta9p1)
Note: this was done by selective patching from diffs by hand, in order
to not conflict with the 4.4BSD base code.  Beta9 was done the same way.

Obtained from:	Paul Vixie <paul@vix.com>
1995-08-20 19:59:28 +00:00
rgrimes
2ad6f3dee6 Remove trailing whitespace. 1995-05-30 05:05:38 +00:00
pst
4f0d0da86d get* rework and new bind code 1994-09-25 02:12:49 +00:00
rgrimes
476d6295ee BSD 4.4 Lite Include Sources 1994-05-24 09:57:34 +00:00