udhcpd: HOST_NAME support for static leases
Philippe Jounin
philippe.jounin at orange.fr
Mon May 20 16:30:57 UTC 2019
Hello Denys,
Tested under a debian box: Works as expected with the configuration file
joined !!
Targets tried: debian, centOS, cisco routers
A few very minor remarks:
- with high verbose level (3v), log_static_leases dumps all static
leases, but is called for each new static lease. May be log should be
moved into add_static_lease.
- some typos into the udhcp.conf example
(https://udhcp.busybox.net/udhcpd.conf) : defult (line 55) and defualt
(line 60)
Thanks for the patch, it makes udhcp really helpfull for my project.
Philippe
Le 16/05/2019 à 11:28, Denys Vlasenko a écrit :
> Applied with a lot of changes.
>
> Please test current git!
>
> On Tue, May 7, 2019 at 11:18 PM Philippe Jounin
> <philippe.jounin at orange.fr <mailto:philippe.jounin at orange.fr>> wrote:
>
> Hello all,
>
> First of all, thanks for the continuous support of busybox. I love this set of small footprints applications.
>
> I made a quick hack for udhcpd to support hostnames for static leases.
> If instead of the documented example :
> static_lease 00:60:08:11:CE:4E 192.168.0.54
> static_lease 00:60:08:11:CE:3E 192.168.0.44
> you write :
> static_lease 00:60:08:11:CE:4E 192.168.0.54 host-54
> static_lease 00:60:08:11:CE:3E 192.168.0.44 host-44
>
> udhcpd will use the fourth word to set the HOST_NAME (0x0c) option, allowing the server to set the remote hostname for each static lease.
>
> Here is the patch, feel free to add it into the next release if you think that it may be useful to someone else.
> BTW i created the patch file with the command:
> diff -ruN busybox-1.30.1/networking/udhcp/ busybox-1.30.2/networking/udhcp/ > ~/udhcpd.patch,
> hope it is fine.
>
> Best regards,
> Philippe Jounin
>
>
>
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# Sample udhcpd configuration file (/etc/udhcpd.conf)
# The start and end of the IP lease block
# start 192.168.0.20 #default: 192.168.0.20
# end 192.168.0.254 #default: 192.168.0.254
# The interface that udhcpd will use
interface eth0.1654 #default: eth0
# The maximim number of leases (includes addressesd reserved
# by OFFER's, DECLINE's, and ARP conficts
#max_leases 254 #default: 254
# If remaining is true (default), udhcpd will store the time
# remaining for each lease in the udhcpd leases file. This is
# for embedded systems that cannot keep time between reboots.
# If you set remaining to no, the absolute time that the lease
# expires at will be stored in the dhcpd.leases file.
#remaining yes #default: yes
# The time period at which udhcpd will write out a dhcpd.leases
# file. If this is 0, udhcpd will never automatically write a
# lease file. (specified in seconds)
#auto_time 7200 #default: 7200 (2 hours)
# The amount of time that an IP will be reserved (leased) for if a
# DHCP decline message is received (seconds).
#decline_time 3600 #default: 3600 (1 hour)
# The amount of time that an IP will be reserved (leased) for if an
# ARP conflct occurs. (seconds
#conflict_time 3600 #default: 3600 (1 hour)
# How long an offered address is reserved (leased) in seconds
#offer_time 60 #default: 60 (1 minute)
# If a lease to be given is below this value, the full lease time is
# instead used (seconds).
#min_lease 60 #defult: 60
# The location of the leases file
#lease_file /var/lib/misc/udhcpd.leases #defualt: /var/lib/misc/udhcpd.leases
# The location of the pid file
#pidfile /var/run/udhcpd.pid #default: /var/run/udhcpd.pid
# Everytime udhcpd writes a leases file, the below script will be called.
# Useful for writing the lease file to flash every few hours.
#notify_file #default: (no script)
#notify_file dumpleases # <--- usefull for debugging
# The following are bootp specific options, setable by udhcpd.
#siaddr 192.168.0.22 #default: 0.0.0.0
#sname zorak #default: (none)
#boot_file /var/nfs_root #default: (none)
# The remainer of options are DHCP options and can be specifed with the
# keyword 'opt' or 'option'. If an option can take multiple items, such
# as the dns option, they can be listed on the same line, or multiple
# lines. The only option with a default is 'lease'.
#Examles
opt dns 208.67.222.222 208.67.220.220
option subnet 255.255.255.0
opt router 172.16.54.1
option domain sclab.space
option lease 864000 # 10 days of seconds
# Currently supported options, for more info, see options.c
#subnet
#timezone
#router
#timesvr
#namesvr
#dns
#logsvr
#cookiesvr
#lprsvr
#bootsize
#domain
#swapsvr
#rootpath
#ipttl
#mtu
#broadcast
#wins
#lease
#ntpsrv
#tftp
#bootfile
static_lease 00:50:56:16:54:e6 172.16.54.230 csrv1k-230
static_lease 00:50:56:16:54:e7 172.16.54.231 csrv1k-231
static_lease 00:50:56:16:54:e8 172.16.54.232 csrv1k-232
static_lease 00:50:56:16:54:e9 172.16.54.233 csrv1k-233
static_lease 00:50:56:16:54:ea 172.16.54.234 csrv1k-234
static_lease 00:50:56:16:54:eb 172.16.54.235 csrv1k-235
static_lease 00:50:56:16:54:ec 172.16.54.236 csrv1k-236
static_lease 00:50:56:16:54:ed 172.16.54.237 csrv1k-237
static_lease 00:50:56:16:54:ee 172.16.54.238 csrv1k-238
static_lease 00:50:56:16:54:ef 172.16.54.239 csrv1k-239
static_lease 00:50:56:16:54:f0 172.16.54.240 centoslab-240
static_lease 00:50:56:16:54:f1 172.16.54.241 centoslab-241
static_lease 00:50:56:16:54:f2 172.16.54.242 centoslab-242
static_lease 00:50:56:16:54:f3 172.16.54.243 centoslab-243
static_lease 00:50:56:16:54:f4 172.16.54.244 centoslab-244
static_lease 00:50:56:16:54:f5 172.16.54.245 centoslab-245
static_lease 00:50:56:16:54:f6 172.16.54.246 centoslab-246
static_lease 00:50:56:16:54:f7 172.16.54.247 centoslab-247
static_lease 00:50:56:16:54:f8 172.16.54.248 centoslab-248
static_lease 00:50:56:16:54:f9 172.16.54.249 centoslab-249
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