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Convert macaddr documentation to DocBook, update outdated information.
This commit is contained in:
Peter Eisentraut
parent
2d5ff2f9a0
commit
baa3a09b5f
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PostgreSQL type extensions for IP and MAC addresses.
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---------------------------------------------------
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$Id: README.inet,v 1.1 1998/10/08 00:19:32 momjian Exp $
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I needed to record IP and MAC level ethernet addresses in a data
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base, and I really didn't want to store them as plain strings, with
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no enforced error checking, so I put together the accompanying code
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as my first experiment with adding a data type to PostgreSQL. I
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then thought that this might be useful to others, both directly and
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as a very simple example of how to do this sort of thing, so I
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submitted it to the PostgreSQL project for inclusion in the contrib
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directory. Since then, that directory has been modified to contain
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Aleksei Roudnev's implementation, which is based on mine.
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For those who have seen my previous contribution of these types, note
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that much has changed: I've modified the IP address type to work the
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way Paul Vixie did with his CIDR type. In fact, I've pretty much just
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stolen his solution, modifying it into my framework in such a way as
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to facilitate the addition of IPV6 handling code in the future. I've
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pretty much ignored Aleksei's C code, but I've added his SQL code to
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enter the necessary operators into the various system tables needed to
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make the types indexable.
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IP addresses are implemented as a struct of fixed in-memory length,
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but variable on-disk storage size. For IPV4, it contains the address
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family (AF_INET), the CIDR prefix length and four byte address. For
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IPV6, the address family will be different, and the address longer.
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The external representation of an IP address generally looks like
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'158.37.96.15/32'. This address happens to be part of a subnet where
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I work; '158.37.96.0/24', which itself is a part of the larger subnet
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allocated to our site, which is '158.37.96.0/21', which again, if you
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go by the old book, is part of the class "B" net '158.37.0.0/16'.
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Input and output functions are supplied, along with the "normal" <,
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<=, =, >=, > and <> operators, which all do what you expect. In
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addition, there are operators to check for networks or addresses being
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subnets of or addresses contained within other networks. << tests
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whether the left operand is contained within the right, <<= includes
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equality, >> and >>= do the same things the opposite way.
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The input and output functions use routines from Paul Vixie's BIND,
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and I've snarfed the source files inet_net_ntop.c and inet_net_pton.c
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directly from a recent distribution of that code. They are included
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here to avoid the need to fetch and install the BIND libraries to be
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able to use this code. IANAL, but it looks from the copyright
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messages in the files as if this should be acceptable. Read the
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documentation in inet_net_pton.c to see the legal input formats.
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MAC level ethernet addresses are implemented as a 6 byte struct that
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contains the address as unsigned chars. Several input forms are
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accepted; the following are all the same address: '08002b:010203',
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'08002b-010203', '0800.2b01.0203', '08-00-2b-01-02-03' and
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'08:00:2b:01:02:03'. Upper and lower case is accepted for the digits
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'a' through 'f'. Output is always in the latter of the given forms.
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As with IP addresses, input and output functions are supplied as well
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as the "normal" operators, which do what you expect. As an extra
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feature, a function macaddr_manuf() is defined, which returns the name
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of the manufacturer as a string. This is currently held in a
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hard-coded struct internal to the C module -- it might be smarter to
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put this information into an actual data base table, and look up the
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manufacturer there.
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Many thanks to Aleksei Roudnev and Paul Vixie for their fine work!
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I don't know what changes are needed to the Makefile for other systems
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than the one I'm running (NetBSD 1.3), but anyway: to install on a BSD
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system: fix the path names in the Makefile if you need to, then make,
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make install, slurp the SQL files into psql or whatever, and you're
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off. Enjoy!
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Bergen, Norway, 1998-08-09, Tom Ivar Helbekkmo (tih@nhh.no).
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@ -1,5 +1,5 @@
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.37 2000/09/29 20:21:33 petere Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.38 2000/10/04 15:47:45 petere Exp $
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-->
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<chapter id="datatype">
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@ -1732,67 +1732,78 @@ January 8 04:05:06 1999 PST
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</sect1>
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<sect1 id="net-types">
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<title>IP Version 4 Networks and Host Addresses</title>
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<title>Network Address Data Types</title>
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<para>
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The <type>cidr</type> type stores networks specified
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in <acronym>CIDR</acronym> (Classless Inter-Domain Routing) notation.
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The <type>inet</type> type stores hosts and networks in CIDR notation using a simple
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variation in representation to represent simple host TCP/IP addresses.
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</para>
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<productname>Postgres</> offers data types to store IP and MAC
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addresses. It is preferrable to use these types over plain text
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types, because these types offer input error checking and several
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specialized operators and functions.
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<para>
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<table tocentry="1">
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<title><productname>Postgres</productname>IP Version 4 Types</title>
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<titleabbrev>IPV4</titleabbrev>
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<table tocentry="1" id="net-types-table">
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<title>Network Address Data Types</title>
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<tgroup cols="4">
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<thead>
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<row>
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<entry>IPV4 Type</entry>
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<entry>Name</entry>
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<entry>Storage</entry>
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<entry>Description</entry>
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<entry>Range</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>cidr</entry>
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<entry>variable</entry>
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<entry>CIDR networks</entry>
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<entry>Valid IPV4 CIDR blocks</entry>
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<entry>11 bytes</entry>
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<entry>IP networks</entry>
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<entry>valid IPv4 networks</entry>
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</row>
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<row>
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<entry>inet</entry>
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<entry>variable</entry>
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<entry>nets and hosts</entry>
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<entry>Valid IPV4 CIDR blocks</entry>
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<entry>11 bytes</entry>
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<entry>IP hosts and networks</entry>
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<entry>valid IPv4 hosts</entry>
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</row>
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<row>
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<entry>macaddr</entry>
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<entry>6 bytes</entry>
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<entry>MAC addresses</entry>
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<entry>customary formats</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</para>
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<sect2>
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<title>CIDR</title>
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<para>
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IP v6 is not supported, yet.
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</para>
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<sect2 id="cidr-type">
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<title><type>cidr</></title>
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<para>
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The <type>cidr</type> type holds a CIDR network.
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The format for specifying classless networks is
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<replaceable class="parameter">x.x.x.x/y</replaceable>
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where <replaceable class="parameter">x.x.x.x</replaceable> is the
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network and <replaceable class="parameter">/y</replaceable> is
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the number of bits in the netmask.
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If <replaceable class="parameter">/y</replaceable> omitted, it is
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calculated using assumptions from
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the older classfull naming system except that it is extended to include at least
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all of the octets in the input.
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The <type>cidr</type> type holds an IP network. The format for
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specifying classless networks is <replaceable
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class="parameter">x.x.x.x/y</> where <replaceable
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class="parameter">x.x.x.x</> is the network and <replaceable
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class="parameter">y</> is the number of bits in the netmask. If
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<replaceable class="parameter">y</> omitted, it is calculated
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using assumptions from the older classfull naming system except
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that it is extended to include at least all of the octets in the
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input.
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</para>
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<para>
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Here are some examples:
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<table tocentry="1">
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<title><productname>Postgres</productname>IP Types Examples</title>
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<title><type>cidr</> Type Input Examples</title>
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<tgroup cols="2">
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<thead>
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<row>
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@ -1801,6 +1812,14 @@ January 8 04:05:06 1999 PST
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</row>
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</thead>
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<tbody>
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<row>
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<entry>192.168.100.128/25</entry>
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<entry>192.168.100.128/25</entry>
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</row>
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<row>
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<entry>192.168/25</entry>
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<entry>192.168.0.0/25</entry>
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</row>
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<row>
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<entry>192.168.1</entry>
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<entry>192.168.1/24</entry>
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@ -1839,34 +1858,48 @@ January 8 04:05:06 1999 PST
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</para>
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</sect2>
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<sect2>
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<title id="inet-type"><type>inet</type></title>
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<sect2 id="inet-type">
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<title><type>inet</type></title>
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<para>
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The <type>inet</type> type is designed to hold, in one field, all of the information
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about a host including the CIDR-style subnet that it is in.
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Note that if you want to store proper CIDR networks,
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you should use the <type>cidr</type> type.
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The <type>inet</type> type is similar to the <type>cidr</type>
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type except that the bits in the
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host part can be non-zero.
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Functions exist to extract the various elements of the field.
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The <type>inet</type> type holds an IP host address, and
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optionally the identity of the subnet it is in, all in one field.
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Note that if you want to store networks only, you should use the
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<type>cidr</type> type. The <type>inet</type> type is similar to
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the <type>cidr</type> type except that the bits in the host part
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can be non-zero. Functions exist to extract the various elements
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of the field.
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</para>
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<para>
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The input format for this function is
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<replaceable class="parameter">x.x.x.x/y</replaceable>
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where <replaceable class="parameter">x.x.x.x</replaceable> is
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an internet host and <replaceable class="parameter">y</replaceable>
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is the number of bits in the netmask.
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If the <replaceable class="parameter">/y</replaceable> part is left off,
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it is treated as <literal>/32</literal>.
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On output, the <replaceable class="parameter">/y</replaceable> part is not printed
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if it is <literal>/32</literal>.
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This allows the type to be used as a straight host type by just leaving off
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the bits part.
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The input format for this type is <replaceable
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class="parameter">x.x.x.x/y</replaceable> where <replaceable
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class="parameter">x.x.x.x</replaceable> is an internet host and
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<replaceable class="parameter">y</replaceable> is the number of
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bits in the netmask. If the <replaceable
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class="parameter">y</replaceable> part is left off, then the
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netmask is 32 and you are effectively only storing the address of
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a single host.
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</para>
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</sect2>
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<sect2 id="macaddr-type">
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<title><type>macaddr</></>
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<para>
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The <type>macaddr</> type stores MAC addresses, i.e., Ethernet
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card hardware addresses (although MAC addresses are used for
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other purposes as well). Input is accepted in various customary
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formats, including <literal>'08002b:010203'</>,
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<literal>'08002b-010203'</>, <literal>'0800.2b01.0203'</>,
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<literal>'08-00-2b-01-02-03'</>, and
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<literal>'08:00:2b:01:02:03'</>, which would all specify the same
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address. Upper and lower case is accepted for the digits
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<literal>a</> through <literal>f</>. Output is always in the
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latter of the given forms.
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</para>
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</sect2>
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</sect1>
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</chapter>
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@ -945,17 +945,18 @@
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<listitem>
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<para>
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A double quote ('"') between quotation marks is skipped and is not parsed.
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If you want to write a double quote to output you must preceed
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it with a double backslash (<literal>'\\"</literal>), for
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example <literal>'\\"YYYY Month\\"'</literal>.
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A double quote (<quote><literal>"</literal></quote>) between
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quotation marks is skipped and is not parsed. If you want to
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write a double quote to output you must preceed it with a
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double backslash (<literal>'\\"</literal>), for example
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<literal>'\\"YYYY Month\\"'</literal>.
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</para>
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</listitem>
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<listitem>
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<para>
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<function>to_char</function> supports text without a leading
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double quote ('"'), but any string
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double quote but any string
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between a quotation marks is rapidly handled and you are
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guaranteed that it will not be interpreted as a template
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keyword (example: <literal>'"Hello Year: "YYYY'</literal>).
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@ -1473,12 +1474,12 @@ Not defined by this name. Implements the intersection operator '#'
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</para>
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</sect1>
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<sect1 id="cidr-functions">
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<title>IP V4 Functions</title>
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<sect1 id="net-functions">
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<title>Network Address Type Functions</title>
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<para>
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<table tocentry="1">
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<title><productname>Postgres</productname>IP V4 Functions</title>
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<table tocentry="1" id="cidr-inet-functions">
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<title><type>cidr</> and <type>inet</> Functions</title>
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<tgroup cols="4">
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<thead>
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<row>
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@ -1509,13 +1510,13 @@ Not defined by this name. Implements the intersection operator '#'
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</row>
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<row>
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<entry>masklen(cidr)</entry>
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<entry>int4</entry>
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<entry>integer</entry>
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<entry>calculate netmask length</entry>
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<entry>masklen('192.168.1.5/24')</entry>
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</row>
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<row>
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<entry>masklen(inet)</entry>
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<entry>int4</entry>
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<entry>integer</entry>
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<entry>calculate netmask length</entry>
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<entry>masklen('192.168.1.5/24')</entry>
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</row>
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@ -1525,9 +1526,21 @@ Not defined by this name. Implements the intersection operator '#'
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<entry>construct netmask as text</entry>
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<entry>netmask('192.168.1.5/24')</entry>
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</row>
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<row>
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<entry>trunc(macaddr)</entry>
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<entry>macaddr</entry>
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<entry>set last 3 bytes to zero</entry>
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<entry>trunc(macaddr '12:34:56:78:90:ab')</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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The function <function>trunc</>(<type>macaddr</>) returns a MAC
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address with the last 3 bytes set to 0. This can be used to
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associate the remaining prefix with a manufacturer. The directory
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<filename>contrib/mac</> in the source distribution contains some
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utilities to create and maintain such an association table.
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</para>
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</sect1>
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@ -1,5 +1,5 @@
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/Attic/oper.sgml,v 1.19 2000/09/29 20:21:34 petere Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/Attic/oper.sgml,v 1.20 2000/10/04 15:47:45 petere Exp $
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-->
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<Chapter Id="operators">
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@ -722,13 +722,15 @@ logical union
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</Para>
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</sect1>
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<sect1 id="cidr-operators">
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<title>IP V4 CIDR Operators</title>
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<Para>
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<TABLE TOCENTRY="1">
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<TITLE><ProductName>Postgres</ProductName>IP V4 CIDR Operators</TITLE>
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<TITLEABBREV>Operators</TITLEABBREV>
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<sect1 id="net-operators">
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<title>Network Address Type Operators</title>
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<sect2 id="cidr-operators">
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<title><type>cidr</> Operators</title>
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<table tocentry="1" id="cidr-operators-table">
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<title><type>cidr</> Operators</title>
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<TGROUP COLS="3">
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<THEAD>
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<ROW>
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@ -791,16 +793,13 @@ logical union
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</TBODY>
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</TGROUP>
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</TABLE>
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</Para>
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</sect1>
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</sect2>
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<sect1 id="inet-operators">
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<title>IP V4 INET Operators</title>
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<sect2 id="inet-operators">
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<title><type>inet</> Operators</title>
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<Para>
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<TABLE TOCENTRY="1">
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<TITLE><ProductName>Postgres</ProductName>IP V4 INET Operators</TITLE>
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<TITLEABBREV>Operators</TITLEABBREV>
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<table tocentry="1" id="inet-operators-table">
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<title><type>inet</> Operators</title>
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<TGROUP COLS="3">
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<THEAD>
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<ROW>
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@ -863,7 +862,18 @@ logical union
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</TBODY>
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</TGROUP>
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</TABLE>
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</Para>
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</sect2>
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<sect2 id="macaddr-operators">
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<title><type>macaddr</> Operators</>
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<para>
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The <type>macaddr</> type supports the standard relational
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operators (<literal>></>, <literal><=</>, etc.) for
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lexicographical ordering.
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</para>
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</sect2>
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</sect1>
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</Chapter>
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Reference in New Issue
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