410 lines
10 KiB
Groff
410 lines
10 KiB
Groff
.\" Copyright (c) 1988, 1989, 1991 Carnegie Mellon University
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.\"
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.\" $Id: bootptab.5,v 1.2 1998/02/03 07:30:22 charnier Exp $
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.\"
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.Dd October 31, 1991
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.Dt BOOTPTAB 5
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.Os "Carnegie Mellon University"
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.Sh NAME
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.Nm bootptab
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.Nd Internet Bootstrap Protocol server database
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.Sh DESCRIPTION
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The
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.Nm
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file is the configuration database file for
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.Xr bootpd 8 ,
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the Internet Bootstrap Protocol server.
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Its format is similar to that of
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.Xr termcap 5
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in which two-character case-sensitive tag symbols are used to
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represent host parameters. These parameter declarations are separated by
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colons (:), with a general format of:
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.Pp
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.Dl "hostname:tg=value. . . :tg=value. . . :tg=value. . . ."
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.Pp
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where
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.Em hostname
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is the actual name of a bootp client (or a "dummy entry"), and
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.Em tg
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is a two-character tag symbol. Dummy entries have an invalid hostname
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(one with a "." as the first character) and are used to provide
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default values used by other entries via the
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.Em tc=.dummy-entry
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mechanism. Most tags must be followed by an equals-sign
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and a value as above. Some may also appear in a boolean form with no
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value (i.e.
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.Em :tg: Ns ).
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The currently recognized tags are:
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.Pp
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.Bl -tag -width xxx -compact
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.It bf
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Bootfile
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.It bs
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Bootfile size in 512-octet blocks
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.It cs
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Cookie server address list
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.It df
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Merit dump file
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.It dn
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Domain name
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.It ds
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Domain name server address list
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.It ef
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Extension file
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.It gw
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Gateway address list
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.It ha
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Host hardware address
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.It hd
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Bootfile home directory
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.It hn
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Send client's hostname to client
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.It ht
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Host hardware type (see Assigned Numbers RFC)
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.It im
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Impress server address list
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.It ip
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Host IP address
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.It lg
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Log server address list
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.It lp
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LPR server address list
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.It ns
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IEN-116 name server address list
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.It nt
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NTP (time) Server (RFC 1129)
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.It ra
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Reply address override
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.It rl
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Resource location protocol server address list
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.It rp
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Root path to mount as root
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.It sa
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TFTP server address client should use
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.It sm
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Host subnet mask
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.It sw
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Swap server address
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.It tc
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Table continuation (points to similar "template" host entry)
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.It td
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TFTP root directory used by "secure" TFTP servers
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.It to
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Time offset in seconds from UTC
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.It ts
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Time server address list
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.It vm
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Vendor magic cookie selector
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.It yd
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YP (NIS) domain name
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.It ys
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YP (NIS) server address
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.El
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.Pp
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There is also a generic tag,
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.Pf T Em n ,
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where
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.Em n
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is an RFC1084 vendor field tag number. Thus it is possible to immediately
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take advantage of future extensions to RFC1084 without being forced to modify
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.Nm bootpd
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first. Generic data may be represented as either a stream of hexadecimal
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numbers or as a quoted string of
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.Tn ASCII
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characters. The length of the generic
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data is automatically determined and inserted into the proper field(s) of the
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RFC1084-style bootp reply.
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.Pp
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The following tags take a whitespace-separated list of IP addresses:
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.Em cs ,
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.Em ds ,
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.Em gw ,
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.Em im ,
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.Em lg ,
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.Em lp ,
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.Em ns ,
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.Em nt ,
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.Em ra ,
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.Em rl ,
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and
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.Em ts .
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The
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.Em ip ,
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.Em sa ,
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.Em sw ,
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.Em sm ,
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and
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.Em ys
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tags each take a single IP address.
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All IP addresses are specified in standard Internet "dot" notation
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and may use decimal, octal, or hexadecimal numbers
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(octal numbers begin with 0, hexadecimal numbers begin with '0x' or '0X').
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Any IP addresses may alternatively be specified as a hostname, causing
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.Nm bootpd
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to lookup the IP address for that host name using
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.Xr gethostbyname 3 .
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If the
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.Em ip
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tag is not specified,
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.Nm bootpd
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will determine the IP address using the entry name as the host name.
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(Dummy entries use an invalid host name to avoid automatic IP lookup.)
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.Pp
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The
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.Em ht
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tag specifies the hardware type code as either an unsigned decimal, octal, or
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hexadecimal integer or one of the following symbolic names:
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.Em ethernet
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or
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.Em ether
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for 10Mb Ethernet,
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.Em ethernet3
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or
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.Em ether3
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for 3Mb experimental Ethernet,
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.Em ieee802 ,
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.Em tr ,
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or
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.Em token-ring
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for IEEE 802 networks,
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.Em pronet
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for Proteon ProNET Token Ring, or
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.Em chaos ,
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.Em arcnet ,
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or
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.Em ax.25
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for Chaos, ARCNET, and AX.25 Amateur Radio networks, respectively.
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The
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.Em ha
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tag takes a hardware address which may be specified as a host name
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or in numeric form. Note that the numeric form
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.Em must
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be specified in hexadecimal; optional periods and/or a leading '0x' may be
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included for readability. The
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.Em ha
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tag must be preceded by the
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.Em ht
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tag (either explicitly or implicitly; see
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.Em tc
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below).
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If the hardware address is not specified and the type is specified
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as either "ethernet" or "ieee802", then
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.Nm bootpd
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will try to determine the hardware address using
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.Xr ether_hostton 3 .
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.Pp
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The hostname, home directory, and bootfile are
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.Tn ASCII
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strings which may be
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optionally surrounded by double quotes ("). The client's request and the
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values of the
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.Em hd
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and
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.Em bf
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symbols determine how the server fills in the bootfile field of the bootp
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reply packet.
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.Pp
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If the client provides a file name it is left as is.
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Otherwise, if the
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.Em bf
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option is specified its value is copied into the reply packet.
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If the
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.Em hd
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option is specified as well, its value is prepended to the
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boot file copied into the reply packet.
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The existence of the boot file is checked only if the
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.Em bs Ns =auto
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option is used (to determine the boot file size).
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A reply may be sent whether or not the boot file exists.
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.Pp
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Some newer versions of
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.Xr tftpd 8
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provide a security feature to change their root directory using
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the
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.Xr chroot 2
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system call.
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The
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.Em td
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tag may be used to inform
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.Nm bootpd
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of this special root directory used by
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.Nm tftpd .
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(One may alternatively use the
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.Nm bootpd
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.Fl c Ar chdir
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option.)
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The
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.Em hd
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tag is actually relative to the root directory specified by the
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.Em td
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tag.
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For example, if the real absolute path to your BOOTP client bootfile is
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.Pa /tftpboot/bootfiles/bootimage ,
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and
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.Nm tftpd
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uses
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.Pa /tftpboot
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as its "secure" directory, then specify the following in
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.Pa bootptab :
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.Pp
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.Dl :td=/tftpboot:hd=/bootfiles:bf=bootimage:
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.Pp
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If your bootfiles are located directly in
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.Pa /tftpboot ,
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use:
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.Pp
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.Dl :td=/tftpboot:hd=/:bf=bootimage:
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.Pp
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The
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.Em sa
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tag may be used to specify the IP address of the particular TFTP server
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you wish the client to use. In the absence of this tag,
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.Nm bootpd
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will tell the client to perform TFTP to the same machine
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.Nm bootpd
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is running on.
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.Pp
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The time offset
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.Em to
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may be either a signed decimal integer specifying the client's
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time zone offset in seconds from UTC, or the keyword
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.Em auto
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which uses the server's time zone offset. Specifying the
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.Em to
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symbol as a boolean has the same effect as specifying
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.Em auto
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as its value.
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.Pp
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The bootfile size
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.Em bs
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may be either a decimal, octal, or hexadecimal integer specifying the size of
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the bootfile in 512-octet blocks, or the keyword
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.Em auto
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which causes the server to automatically calculate the bootfile size at each
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request. As with the time offset, specifying the
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.Em bs
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symbol as a boolean has the same effect as specifying
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.Em auto
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as its value.
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.Pp
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The vendor magic cookie selector (the
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.Em vm
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tag) may take one of the following keywords:
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.Em auto
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(indicating that vendor information is determined by the client's request),
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.Em rfc1048
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or
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.Em rfc1084
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(which always forces an RFC1084-style reply), or
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.Em cmu
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(which always forces a CMU-style reply).
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.Pp
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The
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.Em hn
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tag is strictly a boolean tag; it does not take the usual equals-sign and
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value. Its presence indicates that the hostname should be sent to RFC1084
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clients.
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.Nm Bootpd
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attempts to send the entire hostname as it is specified in the configuration
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file; if this will not fit into the reply packet, the name is shortened to
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just the host field (up to the first period, if present) and then tried.
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In no case is an arbitrarily-truncated hostname sent (if nothing reasonable
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will fit, nothing is sent).
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.Pp
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Often, many host entries share common values for certain tags (such as name
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servers, etc.). Rather than repeatedly specifying these tags, a full
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specification can be listed for one host entry and shared by others via the
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.Em tc
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(table continuation) mechanism.
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Often, the template entry is a dummy host which doesn't actually exist and
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never sends bootp requests. This feature is similar to the
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.Em tc
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feature of
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.Xr termcap 5
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for similar terminals. Note that
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.Nm bootpd
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allows the
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.Em tc
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tag symbol to appear anywhere in the host entry, unlike
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.Pa termcap
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which requires it to be the last tag. Information explicitly specified for a
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host always overrides information implied by a
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.Em tc
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tag symbol, regardless of its location within the entry. The
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value of the
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.Em tc
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tag may be the hostname or IP address of any host entry
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previously listed in the configuration file.
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.Pp
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Sometimes it is necessary to delete a specific tag after it has been inferred
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via
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.Em tc .
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This can be done using the construction
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.Em tag Ns @
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which removes the effect of
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.Em tag
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as in
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.Xr termcap 5 .
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For example, to completely undo an IEN-116 name server specification, use
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.Em :ns@:
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at an appropriate place in the configuration entry. After removal
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with
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.Em @ ,
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a tag is eligible to be set again through the
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.Em tc
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mechanism.
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.Pp
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Blank lines and lines beginning with "#" are ignored in the configuration
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file. Host entries are separated from one another by newlines; a single host
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entry may be extended over multiple lines if the lines end with a backslash
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(\\). It is also acceptable for lines to be longer than 80 characters. Tags
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may appear in any order, with the following exceptions: the hostname must be
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the very first field in an entry, and the hardware type must precede the
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hardware address.
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.Pp
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An example
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.Pa /etc/bootptab
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file follows:
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.Pp
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.nf
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# Sample bootptab file (domain=andrew.cmu.edu)
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.default:\\
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:hd=/usr/boot:bf=null:\\
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:ds=netserver, lancaster:\\
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:ns=pcs2, pcs1:\\
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:ts=pcs2, pcs1:\\
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:sm=255.255.255.0:\\
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:gw=gw.cs.cmu.edu:\\
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:hn:to=-18000:
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carnegie:ht=6:ha=7FF8100000AF:tc=.default:
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baldwin:ht=1:ha=0800200159C3:tc=.default:
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wylie:ht=1:ha=00DD00CADF00:tc=.default:
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arnold:ht=1:ha=0800200102AD:tc=.default:
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bairdford:ht=1:ha=08002B02A2F9:tc=.default:
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bakerstown:ht=1:ha=08002B0287C8:tc=.default:
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# Special domain name server and option tags for next host
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butlerjct:ha=08002001560D:ds=128.2.13.42:\\
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:T37=0x12345927AD3BCF:\\
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:T99="Special ASCII string":\\
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:tc=.default:
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gastonville:ht=6:ha=7FFF81000A47:tc=.default:
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hahntown:ht=6:ha=7FFF81000434:tc=.default:
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hickman:ht=6:ha=7FFF810001BA:tc=.default:
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lowber:ht=1:ha=00DD00CAF000:tc=.default:
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mtoliver:ht=1:ha=00DD00FE1600:tc=.default:
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.fi
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.Sh FILES
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.Bl -tag -width /etc/bootptab -compact
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.It /etc/bootptab
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.El
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.Sh "SEE ALSO"
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.Xr bootpd 8 ,
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.Xr tftpd 8
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.Pp
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DARPA Internet Request For Comments RFC951, RFC1048, RFC1084, Assigned Numbers
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