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33 Commits

Author SHA1 Message Date
Michael Stapelberg
4a5f55a5de defense in depth: verify hex.DecodeString length 
related to #49
 2020-05-27 09:50:04 +02:00
Matt Layher
7aeb51e9ec
internal/dhcp4d: handle DHCPDECLINE and fix bug regarding MacBook declining leases (#48) 
Fixes #40

Signed-off-by: Matt Layher <mdlayher@gmail.com>
 2020-05-23 20:53:13 +02:00
Michael Stapelberg
53c495091e quirk: enforce minimum lease time of 1 hour for Nintendo devices 
The Nintendo Switch has been observed to hold on to IP addresses even after
their expiration. My guess is that this is an oversight: likely the device
enters power saving mode with a configured IP address and just sleeps through
the expiration time.

As the device seems to wake up once every hour, we enforce a minimum lease time
of 1 hour, but only for affected devices. The rest of the network gets short
lease times.

https://twitter.com/zekjur/status/1263949112036282374
 2020-05-23 09:07:17 +02:00
Matt Layher
e1f2b975a1
internal/dhcp4d: fix staticcheck issues 
Signed-off-by: Matt Layher <mdlayher@gmail.com>
 2020-05-09 16:51:32 -04:00
Michael Stapelberg
2b6ab5b2bd dhcp4d: make hostname override settable from status page 2020-04-12 10:33:11 +02:00
Michael Stapelberg
a543cb9a34 dhcp4d: add header describing whether lease is active 
Should be interpreted by the DHCP server so that other programs don’t need to
hard-code the lease time.
 2020-01-31 19:11:08 +01:00
Michael Stapelberg
41985d6378 dhcp4d: reduce lease period to 20 minutes 
This forces devices to renew the lease more often, which is nice when you want
to tie home automation behavior to DHCP lease validity.
 2020-01-31 18:23:50 +01:00
Michael Stapelberg
fa82132962 dhcp4d: add HostnameOverride field 
This can be used to permanently override a hostname, regardless of whether the
lease is static or not. We use a separate field because we want devices to be
able to change their hostname themselves, until we override it.
 2019-08-30 09:06:21 +02:00
Michael Stapelberg
975f05d7ac fix dhcp4d_test.go 2019-07-20 11:30:52 +02:00
Michael Stapelberg
c602f1d6b6 dhcp4d: introduce -interface flag 2019-07-20 10:50:30 +02:00
Michael Stapelberg
c7be96ac2e dhcp4d: fix IP address comparison 
AFAICT, this wasn’t actually a bug: canLease performs the correct check.
 2019-01-01 10:45:03 +01:00
Michael Stapelberg
0d2e89cebf dhcp4d_test: fix message to match comparison 2019-01-01 10:44:03 +01:00
Michael Stapelberg
b923f145a5 dhcp4d: don’t incorrectly _offer_ reused addresses 
Turns out a5d9e03dd3212f7f0c11dd856b308a16a58a3cdf was not entirely sufficient:
even though reused addresses would not be handed out anymore, they would still
be offered, which results in the client not being able to obtain an address.
 2019-01-01 10:41:29 +01:00
Michael Stapelberg
a5d9e03dd3 dhcp4d: don’t incorrectly hand out reused addresses 
fixes #18
 2018-12-15 12:44:09 +01:00
Michael Stapelberg
e01a38ff78 commit debug statements 2018-10-22 18:58:40 +02:00
Michael Stapelberg
c037bf9c5f dhcp4d: fix panic when receiving unsupported requests 2018-10-22 18:39:25 +02:00
Michael Stapelberg
f606e70250 dhcp4d: respect broadcast bit 
Mac’s Internet Recovery DHCP client requires broadcast responses and will ignore
unicast responses outright.
 2018-10-07 17:36:00 +02:00
Michael Stapelberg
49a59779f5 dhcp4d: don’t offer expired leases 2018-07-15 18:33:11 +02:00
Michael Stapelberg
b347ed74c5 update import paths 2018-07-09 08:54:04 +02:00
Michael Stapelberg
ff7aa8f2cb add copyright notices 2018-06-28 20:08:23 +02:00
Michael Stapelberg
ae15230da3 dhcp4d: log in leases callback 2018-06-24 11:56:39 +02:00
Michael Stapelberg
3ba84074c7 dhcp4d: send replies as unicast using raw sockets 
Preferring unicast over multicast (which hogs a lot of airtime on WiFi networks)
is a best practice.

Some device/access point vendor combinations even seem to entirely eat (some?)
broadcast traffic (sometimes), e.g. my Apple iPhone SE/Ubiquiti UAP-AC-HD, so
that using unicast is required for reliable WiFi.
 2018-06-23 17:46:53 +02:00
Michael Stapelberg
301d4c0d00 dhcp4d: always set broadcast flag for DHCPOFFERs 
We always broadcast them, so we should signal that.
 2018-06-22 18:35:23 +02:00
Michael Stapelberg
5e11eae951 fix dhcp4d_test for larger pool 2018-06-19 09:46:29 +02:00
Michael Stapelberg
957e4de03a no-op: only one branch results in DHCPNAK 2018-06-18 19:29:58 +02:00
Michael Stapelberg
34d494b85c dhcp4d: increase lease range to cover existing leases 2018-06-18 19:29:42 +02:00
Michael Stapelberg
32dd03c7f2 dhcp4d: copy reqIP, its backing storage gets reused 2018-06-15 09:56:07 +02:00
Michael Stapelberg
4c69109db5 dhcp4d: implement permanent leases (no expiration) 2018-06-12 08:21:07 +02:00
Michael Stapelberg
d21822f531 dhcp4d: implement loading leases files from persistent storage 2018-06-09 15:18:01 +02:00
Michael Stapelberg
f9c3c23b16 dhcp4d: implement lease expiration 2018-06-09 15:04:54 +02:00
Michael Stapelberg
3561ec3708 dhcp4d: offer requested address if available 2018-06-07 08:39:47 +02:00
Michael Stapelberg
2ef8bf6ea0 dnsd/dhcp4d: listen on configured address (not hard-coded) 2018-06-04 08:22:45 +02:00
Michael Stapelberg
6b9ce5728a Initial commit 2018-05-27 17:30:42 +02:00