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Cy Schubert 8af0c00bd6 Fix non-recoverable name resolution failures due to negative cache
entries never expiring. This patch honours the negative cache timeout.

To test/experience the failure do the following:

1. Edit /etc/ncd.conf to adjust the cache timeouts as follows:

	positive-time-to-live hosts 30
	negative-time-to-live hosts 1

2. Ensure that nsswitch.conf hosts line contains something like:

	hosts: files cache dns

	Note that cache must be specified before dns.

3. Start nscd.

4. Run the following command:

	while true; do nc -z -w 3 www.google.com 80; sleep 5; done

5. While running the command, remove or comment out all nameserver
   statements in /etc/resolv.conf. After a short while you will notice
   non-recoverable name rsolution failures.

6. Uncomment or replace all nameserver statements back into
   /etc/resolv.conf. Take note that name resolution never recovers.
   To recover nscd must be restarted. This patch fixes this.

PR:		207804
Submitted by:	Jov <amutu@amutu.com>
MFC after:	1 week
2017-05-20 16:58:48 +00:00
bin sh: Keep output buffer across builtins. 2017-05-18 22:10:04 +00:00
cddl Fix time handling in cv_timedwait_hires(). 2017-05-19 05:12:58 +00:00
contrib bsdgrep: Correct per-line line metadata printing 2017-05-20 11:20:03 +00:00
crypto Refine and update blacklist support in sshd 2017-05-12 15:20:12 +00:00
etc Improve time-since-last-scrub calculation. 2017-05-20 16:47:00 +00:00
gnu Add a new GDB_LIBEXEC option to install gdb and kgdb to /usr/libexec. 2017-04-25 18:08:56 +00:00
include <stdio.h>: ftello() and fseeko() were in SUSv2, so extend visibility. 2017-04-29 18:48:05 +00:00
kerberos5 kerberos5: normalize paths using SRCTOP-relative paths or :H when possible 2017-03-04 11:34:36 +00:00
lib libthr: fix warnings at WARNS=6 2017-05-19 13:04:05 +00:00
libexec Update my copyright, note The FreeBSD Foundation involvement. 2017-05-18 09:34:26 +00:00
release Update release/scripts/atlas-upload.sh to account for API changes 2017-05-11 16:37:29 +00:00
rescue DIRDEPS_BUILD: Update dependencies. 2017-05-09 01:48:23 +00:00
sbin Allow zero port specification in table entries with type flow. 2017-05-17 10:56:22 +00:00
secure Fix invalid .o SRCS from r314527. 2017-05-09 01:48:02 +00:00
share Add a driver for the Chelsio T6 crypto accelerator engine. 2017-05-17 22:13:07 +00:00
sys [net80211] prepare for A-MSDU/A-MPDU offload crypto / sequence number checking. 2017-05-20 00:43:52 +00:00
targets Enable llvm-objdump by default per r310775 2017-05-16 03:12:51 +00:00
tests sys/fs/tmpfs/vnd_test: make md(4) allocation dynamic 2017-05-19 17:14:29 +00:00
tools makeman: reword description, based on feedback from wblock 2017-05-15 18:02:13 +00:00
usr.bin bsdgrep: Correct per-line line metadata printing 2017-05-20 11:20:03 +00:00
usr.sbin Fix non-recoverable name resolution failures due to negative cache 2017-05-20 16:58:48 +00:00
.arcconfig callsign isn't required anymore 2016-09-29 06:19:45 +00:00
.arclint
COPYRIGHT Bump copyright year. 2016-12-31 12:41:42 +00:00
LOCKS
MAINTAINERS Due to time constraints remove myself as a vmm(4) maintainer. 2017-04-15 22:42:23 +00:00
Makefile Cache compiler metadata and reuse it at installworld time. 2017-04-13 22:07:34 +00:00
Makefile.inc1 Add a -DNO_LIBS to skip building the libraries phase as well. 2017-05-09 23:58:07 +00:00
Makefile.libcompat Support skipping 'make obj' tree-walk. 2017-05-09 20:21:38 +00:00
ObsoleteFiles.inc Revert r317446 and bring back cy(4). 2017-04-27 16:14:32 +00:00
README Correct the URL to instructions for updated system sources. 2017-05-15 15:18:36 +00:00
README.md Remove hard line breaks from README.md 2017-03-01 15:39:58 +00:00
UPDATING Revert r317432 and add a new entry for r316527. 2017-04-26 16:50:54 +00:00

FreeBSD Source:

This is the top level of the FreeBSD source directory. This file was last revised on: FreeBSD

For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information).

The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7) and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables.

The buildkernel and installkernel targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags.

Building a kernel is a somewhat more involved process. See build(7), config(8), and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information.

Note: If you want to build and install the kernel with the buildkernel and installkernel targets, you might need to build world before. More information is available in the handbook.

The kernel configuration files reside in the sys/<arch>/conf sub-directory. GENERIC is the default configuration used in release builds. NOTES contains entries and documentation for all possible devices, not just those commonly used.

Source Roadmap:

bin				System/user commands.

cddl			Various commands and libraries under the Common Development  
				and Distribution License.

contrib			Packages contributed by 3rd parties.

crypto			Cryptography stuff (see crypto/README).

etc				Template files for /etc.

gnu				Various commands and libraries under the GNU Public License.  
				Please see gnu/COPYING* for more information.

include			System include files.

kerberos5		Kerberos5 (Heimdal) package.

lib				System libraries.

libexec			System daemons.

release			Release building Makefile & associated tools.

rescue			Build system for statically linked /rescue utilities.

sbin			System commands.

secure			Cryptographic libraries and commands.

share			Shared resources.

sys				Kernel sources.

tests			Regression tests which can be run by Kyua.  See tests/README
				for additional information.

tools			Utilities for regression testing and miscellaneous tasks.

usr.bin			User commands.

usr.sbin		System administration commands.

For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see:

http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html