add busybox udhcps functionality

udhcpd.conf.template

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+# template udhcpd configuration file for vm-manager
+
+# The start and end of the IP lease block
+
+start           ${ip_address}    #default: 192.168.0.20
+end             ${ip_address}    #default: 192.168.0.254
+
+
+# The interface that udhcpd will use
+
+interface       ${interface}             #default: eth0
+
+
+# The maximim number of leases (includes addressesd reserved
+# by OFFERs, DECLINEs, 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 lease file
+# we need no lease file as we give out always the same ip
+lease_file     /dev/null     #defualt: /var/lib/misc/udhcpd.leases
+
+# The location of the pid file
+pidfile        ${pidfile}     #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      # <--- useful 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     ${dns1} ${dns2}
+option  subnet  255.255.255.255
+opt     router  ${router}
+#opt    wins    192.168.10.10
+#option  dns     44333   # appened to above DNS servers for a total of 3
+#option  domain  fw
+option  lease   864000          # 10 days of seconds
+
+
+# Currently supported options, for more info, see options.c
+#opt subnet
+#opt timezone
+#opt router
+#opt timesrv
+#opt namesrv
+#opt dns
+#opt logsrv
+#opt cookiesrv
+#opt lprsrv
+#opt bootsize
+#opt domain
+#opt swapsrv
+#opt rootpath
+#opt ipttl
+#opt mtu
+#opt broadcast
+#opt wins
+#opt lease
+#opt ntpsrv
+#opt tftp
+#opt bootfile
+#opt wpad
+
+# Static leases map
+#static_lease 00:60:08:11:CE:4E 192.168.0.54
+#static_lease 00:60:08:11:CE:3E 192.168.0.44
+