Commit Graph

119 Commits

Author SHA1 Message Date
John Baldwin
9291a1cd14 Use a higher TTL (128) for DHCP packets. This matches the ISC DHCP client.
PR:		bin/170279
MFC after:	1 week
2013-04-22 15:02:32 +00:00
John Baldwin
0a26f85822 Revert r239356 and use an alternate algorithm.
First, don't exit when the link goes down on an interface.  Instead,
teach dhclient to track changes in link state and to enter the reboot
state when the link on an interface goes up causing dhclient to attempt
to renew its existing lease.

Second, remove the change I added to clear the old lease when dhclient
exits due to an error (such as ifconfig down).  If an interface is
using autoconfiguration it should keep its autoconfiguration as much as
possible.  If the next time it needs a configuration it is able to reuse
the previous autoconfiguration, then leaving the settings intact allows
existing connections to survive temporary outages, etc.

PR:		bin/166656
MFC after:	1 month
2012-08-22 13:53:37 +00:00
John Baldwin
83f745b8b9 Fix dhclient to properly exit and teardown the configured lease when
link is lost.  devd will start a new dhclient instance when link is
restored.

PR:		bin/166656
Submitted by:	Peter Jeremy (mostly)
Reviewed by:	brooks (earlier version from Peter)
MFC after:	1 month
2012-08-17 15:53:43 +00:00
Ulrich Spörlein
4b85a12f71 Spelling fixes for sbin/ 2012-01-07 16:09:33 +00:00
Jean-Sébastien Pédron
999f397284 Set svn:executable on dhclient-script
Sponsored by:	Yakaz (http://www.yakaz.com)
2011-12-30 14:46:53 +00:00
Jean-Sébastien Pédron
33d5b03267 Invalid Domain Search option isn't considered as a fatal error
In the original Domain Search option patch, an invalid option value
would cause the whole lease to be rejected. However, DHCP servers who
emit such an invalid value are more common than I thought. With this new
patch, just the option is rejected, not the entire lease.

PR:		bin/163431
Submitted by:	Fabian Keil <fk@fabiankeil.de> (earlier version)
Reviewed by:	Fabian Keil <fk@fabiankeil.de>
Sponsored by:	Yakaz (http://www.yakaz.com)
2011-12-30 14:33:08 +00:00
Dimitry Andric
7824741286 In sbin/dhclient, since we know the size of the source strings anyway,
we might as well use memcpy; strlcpy is really unnecessary here.

MFC after:	1 week
2011-12-17 01:29:46 +00:00
Dimitry Andric
e2f95dd941 In sbin/dhclient, work around warnings about the size argument to
strlcpy appearing to be the size of the source buffer, instead of the
destination.

MFC after:	1 week
2011-12-17 01:19:07 +00:00
Gleb Smirnoff
1c6eeddad9 dhclient-script relied on incorrect behavior of SIOCAIFADDR ioctl,
that changed 0.0.0.0/0.0.0.0 prefix to 0.0.0.0/255.0.0.0.

In the r228313 this behavior was fixed, and since dhclient-script
got broken.

I'm not sure this fix is a perfect one, it just changes
dhclient-script to set 0.0.0.0/255.0.0.0 explicitly.

PR:		kern/163206
2011-12-13 11:54:51 +00:00
Jean-Sébastien Pédron
409139f051 Support domain-search in dhclient(8)
The "domain-search" option (option 119) allows a DHCP server to publish
a list of implicit domain suffixes used during name lookup. This option
is described in RFC 3397.

For instance, if the domain-search option says:
    ".example.org .example.com"
and one wants to resolve "foobar", the resolver will try:
    1. "foobar.example.org"
    2. "foobar.example.com"

The file /etc/resolv.conf is updated with a "search" directive if the
DHCP server provides "domain-search".

A regression test suite is included in this patch under
tools/regression/sbin/dhclient.

PR:		bin/151940
Sponsored by	Yakaz (http://www.yakaz.com)
2011-12-04 14:44:31 +00:00
Dag-Erling Smørgrav
23f39c906b Make dhclient use a pid file. Modify the rc script accordingly; while
there, clean it up and add some error checks.

Glanced at by:	brooks@
MFC after:	3 weeks
2011-10-13 17:20:45 +00:00
Hajimu UMEMOTO
9201145d02 Use resolvconf(8) to update /etc/resolv.conf.
If you don't want to use resolvconf(8) to update /etc/resolv.conf,
you can put resolvconf_enable="NO" into /etc/dhclient-enter-hooks.
2011-03-18 12:23:20 +00:00
Brian Somers
5172455266 Document dhclient-enter-hooks and dhclient-exit-hooks and mention
how to configure dhclient to clear the interface of IP numbers prior
to configuring it.

PR:		149351
MFC after:	2 weeks
2010-09-06 09:59:10 +00:00
Brian Somers
6964abef83 When dhclient obtains a lease, it runs dhclient-script and expects
it to configure the interface.  When the script is complete, dhclient
monitors the routing socket and will terminate if its address is
deleted or if its interface is removed or brought down.

Because the routing socket is already open when dhclient-script is
run, dhclient ignores address deletions for 10 seconds after the
script was run.

If the address that will be obtained is already configured on the
interface before dhclient starts, and if dhclient-script takes more
than 10 seconds (perhaps due to dhclient-*-hooks latencies), on script
completion, dhclient will immediately and silently exit when it sees
the RTM_DELADDR routing message resulting from the script reassigning
the address to the interface.

This change logs dhclient's reason for exiting and also changes the
10 second timeout to be effective from completion of dhclient-script
rather than from when it was started.

We now ignore RTM_DELADDR and RTM_NEWADDR messages when the message
contains no interface address (which should not happen) rather than
exiting.

Not reviewed by:	brooks (timeout)
MFC after:		3 weeks
2010-07-07 06:06:54 +00:00
Philip Paeps
9b683f8da6 Make dhclient use bootpc (68) as the source port for unicast DHCPREQUEST
packets instead of allowing the protocol stack to pick a random source port.

This fixes the behaviour where dhclient would never transition from RENEWING
to BOUND without going through REBINDING in networks which are paranoid about
DHCP spoofing, such as most mainstream cable-broadband ISP networks.

Reviewed by:	brooks
Obtained from:	OpenBSD (partly - I'm not convinced their solution can work)
MFC after:	1 week (pending re approval)
2009-10-21 23:50:35 +00:00
Ruslan Ermilov
106d839190 Switch the default WARNS level for sbin/ to 6.
Submitted by:	Ulrich Spörlein
2009-10-19 16:00:24 +00:00
Sam Leffler
f8c44ada2e Fix the logic to count the number of "live interfaces". With this change
dhclient now terminates when the underlying ifnet is destroyed (e.g.
on card eject).

Reviewed by:	brooks
Approved by:	re (kib)
2009-07-21 15:06:10 +00:00
Brian Somers
043bcc8d44 Fix an off by one error when we limit append/prepend text sizes based on our
internal buffer sizes.

When we 'append', assume we're appending to text.  Some MS dhcp servers will
give us a string with the length including the trailing NUL.  when we 'append
domain-name', we get something like "search x.y\000 z" in resolv.conf :(

MFC after:	1 week
Security:	A buffer overflow (by one NUL byte) was possible.
2009-06-08 21:42:30 +00:00
Brooks Davis
38e755fd40 Support the remaining options listed in dhcp-options(5) and RFC 2132.
PR:		bin/127076
Submitted by:	jkim
MFC after:	1 week
2008-10-17 13:28:53 +00:00
Ed Schouten
708925463e Run the privileged dhclient process in its own session.
In the MPSAFE TTY branch, I noticed PTY's to be leaked, because
dhclient's privileged process was run inside the session of, say, the
login shell. Make sure we call setsid() here.

Approved by:	philip (mentor), brooks
2008-06-30 20:23:49 +00:00
Brooks Davis
9761cdd839 Use the -n flag to route(8) when calling "route get". Otherwise we hang
for a long time if we get a lease, but DNS isn't working.

MFC after:	1 week
2008-06-09 20:03:35 +00:00
Brooks Davis
8ca3089abc When sending packets directly to the DHCP server, use a socket and send
directly rather than bogusly sending it out as a link layer broadcast
(which fails to be received on some networks).

PR:		bin/96018
MFC after:	2 weeks
2008-04-15 22:48:56 +00:00
Brooks Davis
d5354256b6 Add a new function is_default_interface() which determines if this
interface is one with the default route (or there isn't one).  Use it to
decide if we should adjust the default route and /etc/resolv.conf.

Fix the delete of the default route.  The if statement was totally bogus
and the delete only worked due to a typo. [1]

Reported by:	Jordan Coleman <jordan at JordanColeman dot com> [1]
MFC after:	1 week
2008-03-30 02:42:39 +00:00
Sam Leffler
61063e478a Defer state change on disassociate to avoid unnecessarily dropping the
lease: track the current bssid and if it changes (as reported in an
assoc/reassoc) event only then kick the state machine.  This gives us
immediate response when roaming but otherwise causes us to fallback on
the normal state machine.

Reviewed by:	brooks, jhb
MFC after:	3 weeks
2008-03-22 16:24:02 +00:00
Sam Leffler
043f1935e0 correct syslog mask so LOG_DEBUG msgs are not lost
MFC after:	2 weeks
2008-03-22 16:18:07 +00:00
Brooks Davis
1547317e88 During PREINIT, when giving the interface the address 0.0.0.0, do it as an
alias to avoid distrubing other addresses.

PR:		bin/119255
Submitted by:	Jaakko Heinonen <jh at saunalahti dot fi>
2008-01-21 23:54:57 +00:00
Jung-uk Kim
cd765a6594 Teach dhclient(8) about net80211 link (association) status.
Reviewed by:	brooks
MFC after:	3 days
2007-12-05 17:13:45 +00:00
Gabor Kovesdan
6b7267a277 - Remove references to unexisting man pages
PR:		docs/116099
Submitted by:	Ben Kaduk <minimarmot@gmail.com>
Approved by:	re (bmah)
MFC after:	3 days
2007-09-20 10:46:25 +00:00
Andrew Thompson
60932bc9ae Use the -n flag on ifconfig so that dhclient does not cause the kernel module
to be reloaded when the interface is torn down.

Reviewed by:	brooks
Approved by:	re (kensmith)
2007-07-03 17:49:32 +00:00
Ed Maste
9f0d81ba56 The minimum size of an RFC3442 destination descriptor is five bytes, so
correct test to -ge 5.  Without this change an RFC3442 encoded default
route would be ignored.

Reported by:	Cedric Jonas <cedric at decemplex dot net>
2007-04-13 15:07:10 +00:00
Ed Maste
2fcc737008 Implement RFC3442, the Classless Static Route option.
The original DHCP specification includes a route option but it supports
only class-based routes.  RFC3442 adds support for specifying the netmask
width for each static route.  A variable length encoding is used to minimize
the size of this option.

PR:             bin/99534
Submitted by:   Andrey V. Elsukov <bu7cher@yandex.ru>
Reviewed by:    brooks
2007-02-09 17:50:26 +00:00
Ed Maste
a2d605f78c Add a $FreeBSD$ tag missing after the original import. Note that this
file isn't actually installed; the one in src/etc is.
2007-02-09 16:28:25 +00:00
Brooks Davis
a0b5cadc42 Actually implement rev 1.12 for host names and NIS domain names. We
were removing the invalid option, but still rejecting the lease.

Reported by:	Yoshihiko Sarumaru <mistral at imasy dot or dot jp>
2007-01-29 15:55:13 +00:00
Brooks Davis
ebe609b4a2 It is possible for bpf to return a length such that:
length != BPF_WORDALIGN(length)

This meeans that it is possible for this to be true:

	interface->rbuf_offset > interface->rbuf_len

Handle this case in the test for running out of packets.  While
OpenBSD's solution of setting interface->rbuf_len to
BPF_WORDALIGN(length) is safe due to the size of the buffer, I think
this solution results in less hidden assumptions.

This should fix the problem of dhclient running away and consuming 100%
CPU.

PR:		bin/102226
Submitted by:	Joost Bekkers <joost at jodocus.org>
MFC after:	3 days
2006-09-26 01:02:02 +00:00
Brian Somers
3dd3357a13 Revert the addition of -p. It's flawed in that dhclient should not run
on an interface without carrier.  devd should be used instead to handle
link up/down events.

Put on the right path by:	brooks, sam
2006-08-21 16:31:31 +00:00
Brian Somers
4fdeb33466 Bump the document date. s/dhclient/.Nm/
Suggested by: ru
2006-08-17 20:11:21 +00:00
Brian Somers
43cb852dc0 Correct usage() 2006-08-17 17:27:42 +00:00
Brian Somers
9341e8dd88 Add a -p switch to dhclient. The switch tells dhclient to persist
despite the interface link status.

Add dhclient_flags_iface and background_dhclient_iface rc.conf options.
(where iface is a specific interface).  These can be used to give
interface specific flags to dhclient.

Reviewed by:	brooks@
2006-08-17 17:12:27 +00:00
Jung-uk Kim
473c2d129b Send client identifier unconditionally. My ancient D-Link router response
with NACK if I don't set it.  Setting 'option dhcp-client-identifier' is
alternative but it is inconvenient because I have to keep the list of
all MAC addresses.  As bin/94743 pointed out, it is always sent from
Windows clients and I found Mac OS X does the same.

OK'd by:	brooks
2006-07-03 22:05:38 +00:00
Warner Losh
649482853c Remove 'n' from the getopt string. There's no -n option that is
parsed, so it winds up at usage anyway.

Add 'b' to the usage summary.  Noticed by Ben Mesander.
2006-05-23 16:57:47 +00:00
Brooks Davis
fcab8addcf Be more like Windows and Linux and send our hostname in the host-name
option if none is given in the config file.  Also add #ifdefd out
support for sending a client ID based on our MAC address.

PR:		bin/94743, bin/76401
Submitted by:	Frank Behrens <frank at pinky dot sax dot de>
X-MFC after:	6.1-RELEASE
2006-05-07 23:31:10 +00:00
Jesus R. Camou
6912d575ee Correct RFC for NTP.
PR:		docs/92629
Submitted by:	Daniel Gerzo <danger@rulez.sk>
Noticed by:	Michal F. Hanula <f@7f000001.org>
Approved by:	trhodes (mentor)
2006-02-06 19:22:34 +00:00
Brooks Davis
f1bacaa501 Fix rev 1.12.
/tmp may not be writeable yet when dhclient is first run via
/etc/rc.d/netif so using it may not work.  Also, writing to a
predictable file in /tmp as root is a really bad idea since a malicious
user may be able to win a race and insert a symlink which will allow
them to cause any file to be overwritten.  To solve these problems,
create the tempory file in /var/run which will exist this early and is
writable only by root.

Security:	Local risk if users can cause dhclient to run on demand
		(such as by unplugging and replugging the network cable).
2006-01-26 21:05:39 +00:00
Brooks Davis
b0864f3a7d Give the TIMEOUT case a chance to work by using -t # instead of the
OpenBSD -w # when invoking ping.

PR:		bin/92187
Submitted by:	"Shin'ya Kumabuchi" <kumabu at t3 dot rim dot or dot jp>
MFC After:	6 days
2006-01-24 06:11:55 +00:00
Wes Peters
90158aee27 Make dhclient-script more agreeable with read-only /etc.
PR:		90518
Submitted by:	John E. Hein <jhein@timing.com>
MFC after:	3 days
2006-01-23 05:42:59 +00:00
Brooks Davis
3b8376f05e Mention the -b flag in the SYNOPSIS.
MFC after:	1 week
2006-01-10 05:44:11 +00:00
Brooks Davis
b1f35e43b1 When we give up on an interface, use the arp(8) command to remove all
entries from the interface rather than using ifconfig's delete command.
This preserves non-dhclient configured addresses (though they are wiped
out when dhclient is restarted).

MFC after:	1 week
2006-01-10 05:33:33 +00:00
Brooks Davis
dfad96ea18 Allow users to add aliases to the interface.
PR:		bin/87465 (different solution used)
MFC after:	1 week
2006-01-10 04:53:20 +00:00
Brooks Davis
82dbbc4120 When we get a bogus hostname in an option, drop the option rather than
refusing the lease.  This allow obtaining leases on misadministered
networks that use host names with underscores in them.

MFC After: 3 days
2005-12-10 03:46:14 +00:00
Brooks Davis
dd415a50d6 Avoid updating resolv.conf when no changes have actually occured.
Submitted by:	ume
2005-09-08 22:49:17 +00:00