e4f30c89f4
This allows mapping incoming filenames to a different name using regular expressions, followed by subtitutions of the %[ICE] format strings. I needed this to have individual cmdline.txt files for netbooted raspberry pi's. In this example, i map cmdline.txt to %C, which gets substituted for /cfg/pxe/$ether of the client.
356 lines
6.3 KiB
Plaintext
356 lines
6.3 KiB
Plaintext
.TH DHCPD 8
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.SH NAME
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dhcpd, dhcp6d, dhcpleases, rarpd, tftpd \- Internet booting
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.SH SYNOPSIS
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.PP
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.B ip/dhcpd
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.RB [ -dmnprsSZ ]
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.RB [ -h
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.IR homedir ]
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.RB [ -f
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.IR ndbfile ]
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.RB [ -M
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.IR secs ]
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.RB [ -x
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.IR netmtpt ]
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.RB [ -Z
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.IR secs ]
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[
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.I address
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.I n
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] ...
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.PP
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.B ip/dhcpleases
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.PP
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.B ip/dhcp6d
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.RB [ -d ]
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.RB [ -f
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.IR ndbfile ]
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.RB [ -x
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.IR netmtpt ]
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.PP
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.B ip/rarpd
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.RB [ -d ]
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.RB [ -e
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.IR etherdev ]
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.RB [ -x
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.IR netmtpt ]
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.PP
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.B ip/tftpd
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.RB [ -dr ]
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.RB [ -h
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.IR homedir ]
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.RB [ -x
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.IR netmtpt ]
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.RB [ -n
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.IR nsfile ]
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.RB [ -m
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.IR mapfile ]
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.SH DESCRIPTION
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These programs support booting over the Internet.
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They should all be run on the same server to
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allow other systems to be booted.
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.IR Dhcpd ,
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.I dhcp6d
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and
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.I tftpd
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are used to boot everything;
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.I rarpd
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is an extra piece just for Suns.
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.PP
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.I Dhcpd
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runs the
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.SM BOOTP
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and
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.SM DHCP
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protocols.
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Clients use these protocols to obtain configuration information.
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This information comes from attribute/value pairs in the network database
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(see
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.IR ndb (6)
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and
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.IR ndb (8)).
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DHCP requests are honored both for static addresses found in
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the NDB and for dynamic addresses listed in the command line.
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DHCP requests are honored if either:
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.br
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\- there exists an NDB entry
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containing both the ethernet address of the requester and
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an IP address on the originating network or subnetwork.
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.br
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\- a free dynamic address exists on the originating network or subnetwork.
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.PP
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A BOOTP request is honored if all of the following are true:
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.br
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\- there exists an NDB entry
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containing both the ethernet address of the requester and
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an IP address on the originating network or subnetwork.
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.br
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\- the entry contains a
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.B bootf=
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attribute
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.br
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\- the file in the
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.B bootf=
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attribute is readable.
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.PP
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Dynamic addresses are specified on the command line as a list
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of addresses and number pairs.
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For example,
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.EX
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ip/dhcpd 10.1.1.12 10 10.2.1.70 12
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.EE
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directs
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.I dhcpd
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to return dynamic addresses 10.1.1.12 through 10.1.1.21 inclusive
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and 10.2.1.70 through 10.2.1.81 inclusive.
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.PP
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.I Dhcpd
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maintains a record of all dynamic addresses in the directory
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.BR /lib/ndb/dhcp ,
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one file per address.
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If multiple servers have access to this common directory,
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they will correctly coordinate their actions.
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.PP
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Attributes come from either the NDB entry for the system, the entry for its
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subnet, or the entry for its network. The system entry has precedence,
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then the subnet, then the network.
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The NDB attributes used are:
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.TF rootserver
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.TP
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.B ip
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the IP address
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.TP
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.B ipmask
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the IP mask
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.TP
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.B ipgw
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the default IP gateway
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.TP
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.B dom
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the domain name of the system
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.TP
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.B fs
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the default Plan 9 file server
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.TP
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.B auth
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the default Plan 9 authentication server
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.TP
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.B dns
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a domain name server
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.TP
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.B ntp
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a network time protocol server
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.TP
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.B time
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a time server
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.TP
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.B wins
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a
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.SM NETBIOS
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name server
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.TP
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.B www
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a World Wide Web proxy
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.TP
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.B pop3
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a POP3 mail server
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.TP
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.B smtp
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an SMTP mail server
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.TP
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.B bootf
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the default boot file;
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see
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.IR ndb (6)
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.TP
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.B tftp
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the TFTP server to fetch
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.I bootf
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from
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.TP
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.B rootpath
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the NFS root for unix machines
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.TP
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.B rootserver
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the NFS server used with
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.I rootpath
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.TP
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.B vendor
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Specific vendor attribute for dhcp and bootp
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.PD
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.PP
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.I Dhcpd
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will answer
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.SM BOOTP
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requests only if it has been specifically targeted or if it
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has read access to the boot file for the requester. That means that the requester
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must specify a boot file in the request or one has to exist in NDB for
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.I dhcpd
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to answer.
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.I Dhcpd
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will answer all
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.SM DHCP
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requests for which it can associate an IP address with the
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requester.
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The options are:
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.TP
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.B d
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Print debugging to standard output.
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.TP
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.B h
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Change directory to
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.IR homedir .
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The default is
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.BR / .
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This should match the
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.I homedir
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setting of
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.I tftpd
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so that the existence check of non-rooted file names
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is consistent.
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.TP
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.B f
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Specify a file other than
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.B /lib/ndb/local
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as the network database.
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.TP
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.B m
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Mute: don't reply to requests, just log them and what
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.I dhcpd
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would have done.
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.TP
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.B M
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Use
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.I secs
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as the minimum lease time for dynamic addresses.
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.TP
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.B n
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Don't answer
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.SM BOOTP
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requests.
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.TP
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.B p
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Answer
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.SM DHCP
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requests from
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.SM PPTP
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clients only.
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.TP
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.B r
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Mute static addresses: don't reply to requests for static addresses,
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just log them and what
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.I dhcpd
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would have done.
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.TP
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.B s
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Sleep 2 seconds before answering requests for static addresses.
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This is used to make a server be a backup only.
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.TP
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.B S
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Sleep 2 seconds before answering requests for dynamic addresses.
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.TP
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.B x
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The IP stack to use is mounted at
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.IR netmtpt .
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The default is
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.BR /net .
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.TP
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.B Z
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Use
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.I secs
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as the minimum lease time for static addresses.
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.PD
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.PP
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.I Dhcp6d
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provides DHCPv6 service for IPv6 clients. Only network boot and
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DNS parameters are supported.
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.PP
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.I Dhcpleases
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prints out the currently valid DHCP leases found in the
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.B /lib/ndb/dhcp
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directory.
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.PP
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.I Rarpd
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performs the Reverse Address Resolution Protocol, translating
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Ethernet addresses into IP addresses.
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The options are:
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.TP
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.B d
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Print debugging to standard output.
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.TP
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.B e
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Use the Ethernet mounted at
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.BI /net/ etherdev\f1.
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.TP
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.B x
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The IP stack to use is mounted at
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.IR netmtpt .
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The default is
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.BR /net .
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.PD
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.PP
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.I Tftpd
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transfers files to systems that are booting.
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It runs as user
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.B none
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and can only access files with global read permission.
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The options are:
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.TP
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.B d
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Print debugging to standard output.
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.TP
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.B x
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The IP stack to use is mounted at
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.IR netmtpt .
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The default is
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.BR /net .
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.TP
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.B h
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Change directory to
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.IR homedir .
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The default is
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.BR / .
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All requests for files with non-rooted file names are served starting at this
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directory. This needs to be consistent with the
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.I homedir
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setting of
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.IR dhcpd .
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.I Tftpd
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supports only octet mode.
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.TP
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.B r
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Restricts access to only those files rooted in the
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.IR homedir .
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.TP
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.B n
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Sets the namespace file (default /lib/namespace).
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.TP
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.B m
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Loads name substitutions from
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.IR mapfile .
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The format is a space or tab separated two-column text
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with the first column being a regular expression
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(see
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.IR regexp (6))
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that is matched against the requested file name
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and the second column contains a subsitution.
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Lines starting with
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.B #
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are ignored.
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Occurances in the resulting filename of
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.BR %I ,
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.B %C
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or
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.B %E
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are replaced with the ip, cfgpxe name or ether MAC of
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of the client.
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.PD
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.SH FILES
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.BR /lib/ndb/dhcp " directory of dynamic address files
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.SH SOURCE
|
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.B /sys/src/cmd/ip
|
|
.SH "SEE ALSO"
|
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.IR ndb (6),
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.IR booting (8)
|