Commit Graph

86 Commits

Author SHA1 Message Date
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
Brooks Davis
3d0181db3f When we fail to aquire a lease, our lease expires without a sucessful
renewal, or we lose link, be more forceful about clearing interface
state so another interface that connects to the same network has a
chance of working.  This doesn't address attemping to connect to both at
once, but appears to allow unplugging from a wired interface and then
inserting a wireless card that associates with an AP bridged to the same
LAN.
2005-09-08 22:15:19 +00:00
Brooks Davis
40767e22ea When we supersed the subnet-mask, write the forced value to the lease
file.  This is what the ISC client does.

Submitted by:	Rostislav Krasny <rosti dot bsd at gmail dot com>
2005-09-02 17:35:35 +00:00
Brooks Davis
f954ec0bcf Introduce a new helper function check_search() derived for res_hnok to
check the domain-name parameter according to the rules for "search"
strings as documented in resolv.conf(5).  Specifically, the string must
be no more than 256 bytes long and contain no more than six valid domain
names separated by white space.

The previous unchecked values could result in a mangled resolv.conf
file which could effectively deny access to local sites.  This is not
a security issue as rogue dhcp servers could already do this without
sending invalid strings.

Reviewed by:	cperciva
MFC After:	3 days
2005-08-30 18:20:46 +00:00
Brooks Davis
001f040a03 The $medium string often contains quoted values with spaces in them (ssids,
for example).  Follow the example of the ISC script and wrap ifconfig
calls using $medium in eval "..." so this works.

Reported by:	iedowse
2005-08-26 20:31:04 +00:00
Brooks Davis
753d6c0327 In read_string(), when the last character was a backslash, unincrement
the output index instead of keeping what ever trash was in the buffer.

Reported by:	iedowse
2005-08-26 01:25:59 +00:00
Brooks Davis
6ae27cb6ce Use a more robust, grep-free command to get the interface of the current
default route.

Submitted by:	Rostislav Krasny <rosti dot bsd at gmail dot com>
2005-08-26 01:07:51 +00:00
Brooks Davis
7e82455ea8 Don't and/remove a route to our assigned IP through 127.0.0.1. It
serves no apparent purpose (we commented this out ages ago in the ISC
scripts) and cases problems with some ADSL setups.

Reported by:	Rostislav Krasny <rosti dot bsd at gmail dot com>
2005-08-26 01:02:38 +00:00
Brooks Davis
1469b42c7d MFOpenBSD rev 1.9: fix a buffer overflow when processing config file
lines that are exactly 81 characters in length.

Obtained from:	OpenBSD
MFC After:	3 days
2005-08-24 00:05:04 +00:00
Brooks Davis
8794fdbb48 Add __FBSDID to all .c files in dhclient to aid in determining file
versions when dealing with user problems.
2005-08-23 23:59:55 +00:00
Christian S.J. Peron
4d3d08301e FreeBSD unconditionally supports write filters now. 2005-08-23 01:35:38 +00:00
Brooks Davis
289d89d80f Further fix receive_packet() by using BPF_WORDALIGN to insure the offset
is properly aligned when we move to the next packet.

Obtained from:	ISC dhclient via krw at OpenBSD
2005-07-28 15:30:19 +00:00
Brooks Davis
acccb9aa83 Don't reject packets with server names containing characters that are
not allowed in domain names.  RFC 2132 does not list valid or invalid
characters and the ISC client accepts anything here.

Reported by:	ps
2005-07-28 00:24:39 +00:00
Brooks Davis
4eae015de1 Fix a bug in the handling of cases where we got a short (or zero)
capture.  Zero length captures caused an infinte loop and short captures
probably caused memory corruption and a crash.

Reported by:	many
MFC After:	3 days
2005-07-27 19:25:46 +00:00
Brooks Davis
3c0898098e s/if_defaulroute/if_defaultroute/
We may now handle route updates better.
2005-07-26 18:27:37 +00:00
Brooks Davis
a65d8df916 Change host-name from type "X" to type "t". This allows the client to
accept NUL-terminated strings as required by RFC 2132.

This solution is not perfect as it removes the ability to send
NUL-terminated host-name options which may be required by some broken
servers.  Given the current lack of an existance proof of such servers
and the fact that servers that send NUL-terminated domain names do
exist, this seems like an acceptable compromise.  A discussion of these
issues can be found at:

http://marc.theaimsgroup.com/?l=dhcp-client&m=96837107208382&w=2

PR:		bin/83468
Reported by:	Sean Winn <sean at gothic dot net dot au>
MFC-after:	3 days
2005-07-25 22:19:09 +00:00
Sam Leffler
b35f2511fa treat REASSOC events just like ASSOC
MFC after:	3 days
2005-07-25 04:32:40 +00:00
Mark Santcroos
ac0ba90dc8 Bump document date.
Reminded by:	ru
2005-07-20 23:12:54 +00:00
Mark Santcroos
6214c00201 Document -b flag of dhclient.
Reviewed by:	ru
MFC after:	3 days
2005-07-20 22:35:44 +00:00
Brooks Davis
a36c0b6b78 Don't complain when we receive smtp, pop, nntp, www, finger, and irc
server options.

Reported by:	Max Boyarov <max_b at tut dot by>
Approved by:	re (dhclient blanket)
2005-06-30 05:50:52 +00:00
Brooks Davis
b388f1cb10 People like to do RFC violating things with the domain-name option and
include a space seperated list of domains instead of the domain of the
host.  This is supported on too many platforms to break for now so,
remove validation of this option for the moment.

The correct solution longer term is to implement RFC 3397 support and
then treat domain-name options containing space seperated lists of
domains as domain-search options for backwards compatability.

Approved by:	re (dhclient blanket)
2005-06-30 05:32:42 +00:00
Ruslan Ermilov
f9ba39e985 Install the dhcp-options.5 manpage.
Timeout from:	brooks
Approved by:	re (blanket manpages)
2005-06-25 11:03:06 +00:00
Ruslan Ermilov
9a7feaa13c Line up the markup.
Approved by:	re (blanket)
2005-06-22 14:55:59 +00:00
Brooks Davis
59eac186e2 Avoid a null pointer dereference by not expiring our lease if we don't
have an active one.

Submitted by:	sam
Reported by:	James Snow <snow at teardrop dot org>
Approved by:	re (dhclient blanket)
2005-06-13 23:43:08 +00:00
Brooks Davis
d5fedb6e96 Add support for /etc/dhclient-enter-hooks to match /etc/dhclient-exit-hooks. 2005-06-10 03:41:18 +00:00
Brooks Davis
d6790d5a5c Add support for /etc/dhclient-exit-hooks file.
Tested by:	Max Boyarov <max_b at tut dot by>
2005-06-08 18:21:56 +00:00
Brooks Davis
9c13d9cd98 Fix build on 64-bit platforms where time_t is 64 bit. Since where
talking about time related to leases, it should be OK to cast these to
(int)s rather than using intmax_t.

Submitted by:	ru
Pointy hat:	brooks
2005-06-07 14:47:54 +00:00
Ruslan Ermilov
c55cd9092d - Remove OpenBSD'ism (bsd.own.mk).
- Remove redundant and harmful -Wall from CFLAGS.
2005-06-07 09:32:23 +00:00
Brooks Davis
43c56a9bd9 Use SCRIPTS to install dhclient-script instead of rolling our own. 2005-06-07 04:35:48 +00:00
Brooks Davis
8750adaf5a FreeBSDize the dhclient-script.
Submitted by:	sam
2005-06-07 04:32:29 +00:00
Brooks Davis
2b19b6fca1 Define _PATH_VAREMPTY.
Add a -b option to background immediatly.

Add support for 802.11 routing messages to "instantly" renegotiate
at lease when we associate with a new network.

Submitted by:	sam
2005-06-07 04:26:14 +00:00
Brooks Davis
b5be635a44 NULL is not a valid time_t.
Submitted by:	sam
2005-06-07 04:14:54 +00:00
Brooks Davis
1b3bb962f9 We don't support BPF write filters at this time.
Submitted by:	sam
2005-06-07 04:13:52 +00:00
Brooks Davis
955cf67bf4 Take the OpenBSD version of the Makefile to resolve conflicts as the old
one is irrelevent.  Add $FreeBSD.
2005-06-07 04:08:50 +00:00