60 lines
1.5 KiB
Text
60 lines
1.5 KiB
Text
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# -*- text -*-
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#
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# $Id: 665dd2aca16b9498a4d2b8a91e41d27741185738 $
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#
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# This module is useful only for 'xlat'. To use it,
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# add it to the raddb/mods-enabled/ directory. Then,
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# use it on the right-hand side of a variable assignment.
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#
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# ... = "%{unpack:data 1 integer}"
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#
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# The arguments are three fields:
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#
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# data
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# Either &Attribute-Name
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# the name of the attribute to unpack.
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# MUST be a "string" or "octets" type.
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#
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# or 0xabcdef
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# e.g. hex data.
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#
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# 1
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# The offset into the string from which
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# it starts unpacking. The offset starts
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# at zero, for the first attribute.
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#
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# integer
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# the data type to unpack at that offset.
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# e.g. integer, ipaddr, byte, short, etc.
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#
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# e.g. if we have Class = 0x0000000102030405, then
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#
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# %{unpack:&Class 4 short}
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#
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# will unpack octets 4 and 5 as a "short", which has
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# value 0x0304.
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#
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# This module is used when vendors put multiple fields
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# into one attribute of type "octets".
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#
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# The module can also be used to unpack substrings, by specifing a
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# data type of "string(len)" or "octets(len)". Where "len" is an
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# actual number. For example:
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#
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# %{unpack:&User-Name 1 string(2)}
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#
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# When given a User-Name of "hello", it will start taking the
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# substring at offset 1 (i.e. "e"), and it will take two characters
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# from that offset, i.e. "el".
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#
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# When "octets(len)" is used, the output is printed as hex. e.g. for
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# the above example with Class:
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#
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# %{unpack:&Class 4 octets(4)}
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#
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# Will return the hex string "02030405"
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#
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unpack {
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}
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