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85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* inet.h
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* Declarations for operations on INET datatypes.
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*
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*
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* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/utils/inet.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef INET_H
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#define INET_H
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#include "fmgr.h"
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/*
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* This is the internal storage format for IP addresses
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* (both INET and CIDR datatypes):
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*/
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typedef struct
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{
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unsigned char family; /* PGSQL_AF_INET or PGSQL_AF_INET6 */
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unsigned char bits; /* number of bits in netmask */
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unsigned char ipaddr[16]; /* up to 128 bits of address */
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} inet_struct;
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/*
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* Referencing all of the non-AF_INET types to AF_INET lets us work on
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* machines which may not have the appropriate address family (like
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* inet6 addresses when AF_INET6 isn't present) but doesn't cause a
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* dump/reload requirement. Existing databases used AF_INET for the family
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* type on disk.
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*/
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#define PGSQL_AF_INET (AF_INET + 0)
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#define PGSQL_AF_INET6 (AF_INET + 1)
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/*
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* Both INET and CIDR addresses are represented within Postgres as varlena
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* objects, ie, there is a varlena header in front of the struct type
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* depicted above. This struct depicts what we actually have in memory
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* in "uncompressed" cases. Note that since the maximum data size is only
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* 18 bytes, INET/CIDR will invariably be stored into tuples using the
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* 1-byte-header varlena format. However, we have to be prepared to cope
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* with the 4-byte-header format too, because various code may helpfully
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* try to "decompress" 1-byte-header datums.
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*/
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typedef struct
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{
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char vl_len_[4]; /* Do not touch this field directly! */
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inet_struct inet_data;
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} inet;
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/*
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* This is the internal storage format for MAC addresses:
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*/
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typedef struct macaddr
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{
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unsigned char a;
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unsigned char b;
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unsigned char c;
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unsigned char d;
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unsigned char e;
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unsigned char f;
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} macaddr;
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/*
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* fmgr interface macros
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*/
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#define DatumGetInetP(X) ((inet *) PG_DETOAST_DATUM(X))
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#define DatumGetInetPP(X) ((inet *) PG_DETOAST_DATUM_PACKED(X))
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#define InetPGetDatum(X) PointerGetDatum(X)
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#define PG_GETARG_INET_P(n) DatumGetInetP(PG_GETARG_DATUM(n))
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#define PG_GETARG_INET_PP(n) DatumGetInetPP(PG_GETARG_DATUM(n))
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#define PG_RETURN_INET_P(x) return InetPGetDatum(x)
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/* macaddr is a fixed-length pass-by-reference datatype */
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#define DatumGetMacaddrP(X) ((macaddr *) DatumGetPointer(X))
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#define MacaddrPGetDatum(X) PointerGetDatum(X)
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#define PG_GETARG_MACADDR_P(n) DatumGetMacaddrP(PG_GETARG_DATUM(n))
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#define PG_RETURN_MACADDR_P(x) return MacaddrPGetDatum(x)
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#endif /* INET_H */
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