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- udhcp server (udhcpd)
- --------------------
- The only command line argument to udhcpd is an optional specifed
- config file. If no config file is specified, udhcpd uses the default
- config file, /etc/udhcpd.conf. Ex:
- udhcpd /etc/udhcpd.eth1.conf
- The udhcp server employs a number of simple config files:
- udhcpd.leases
- ------------
- The udhcpd.leases behavior is designed for an embedded system. The
- file is written either every auto_time seconds, or when a SIGUSR1
- is received (the auto_time timer restarts if a SIGUSR1 is received).
- If you send a SIGTERM to udhcpd directly after a SIGUSR1, udhcpd will
- finish writing the leases file and wait for the aftermentioned script
- to be executed and finish before quiting, so you do not need to sleep
- between sending signals. When the file is written, a script can be
- optionally called to commit the file to flash. Lease times are stored
- in the file by time remaining in lease (for systems without clock
- that works when there is no power), or by the absolute time that it
- expires in seconds from epoch. In the remaining format, expired leases
- are stored as zero. The file is of the format:
- 16 byte MAC
- 4 byte ip address
- u32 expire time
- 16 byte MAC
- 4 byte ip address
- u32 expire time
- .
- etc.
- example: hexdump udhcpd.leases
- 0000000 1000 c95a 27d9 0000 0000 0000 0000 0000
- 0000010 a8c0 150a 0d00 2d29 5000 23fc 8566 0000
- 0000020 0000 0000 0000 0000 a8c0 140a 0d00 4e29
- 0000030
- udhcpd.conf
- ----------
- The format is fairly simple, there is a sample file with all the
- available options and comments describing them in samples/udhcpd.conf
- compile time options
- -------------------
- dhcpd.h contains the other two compile time options:
- LEASE_TIME: The default lease time if not specified in the config
- file.
- DHCPD_CONFIG_FILE: The defualt config file to use.
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