494 lines
10 KiB
C
494 lines
10 KiB
C
/*
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* PostgreSQL type definitions for the INET type. This
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* is for IP V4 CIDR notation, but prepared for V6: just
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* add the necessary bits where the comments indicate.
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*
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* $Id: network.c,v 1.18 2000/02/21 18:49:54 tgl Exp $
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* Jon Postel RIP 16 Oct 1998
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "postgres.h"
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#include "utils/builtins.h"
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static int v4bitncmp(unsigned int a1, unsigned int a2, int bits);
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/*
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* Access macros. Add IPV6 support.
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*/
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#define ip_addrsize(inetptr) \
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(((inet_struct *)VARDATA(inetptr))->family == AF_INET ? 4 : -1)
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#define ip_family(inetptr) \
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(((inet_struct *)VARDATA(inetptr))->family)
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#define ip_bits(inetptr) \
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(((inet_struct *)VARDATA(inetptr))->bits)
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#define ip_type(inetptr) \
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(((inet_struct *)VARDATA(inetptr))->type)
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#define ip_v4addr(inetptr) \
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(((inet_struct *)VARDATA(inetptr))->addr.ipv4_addr)
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/* Common input routine */
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static inet *
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network_in(char *src, int type)
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{
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int bits;
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inet *dst;
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if (!src)
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return NULL;
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dst = palloc(VARHDRSZ + sizeof(inet_struct));
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if (dst == NULL)
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elog(ERROR, "unable to allocate memory in network_in()");
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/* First, try for an IP V4 address: */
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ip_family(dst) = AF_INET;
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bits = inet_net_pton(ip_family(dst), src, &ip_v4addr(dst),
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type ? ip_addrsize(dst) : -1);
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if ((bits < 0) || (bits > 32))
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/* Go for an IPV6 address here, before faulting out: */
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elog(ERROR, "could not parse \"%s\"", src);
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VARSIZE(dst) = VARHDRSZ
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+ ((char *) &ip_v4addr(dst) - (char *) VARDATA(dst))
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+ ip_addrsize(dst);
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ip_bits(dst) = bits;
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ip_type(dst) = type;
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return dst;
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}
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/* INET address reader. */
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inet *
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inet_in(char *src)
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{
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return network_in(src, 0);
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}
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/* CIDR address reader. */
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inet *
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cidr_in(char *src)
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{
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return network_in(src, 1);
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}
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/*
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* INET address output function.
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*/
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char *
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inet_out(inet *src)
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{
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char *dst,
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tmp[sizeof("255.255.255.255/32")];
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if (ip_family(src) == AF_INET)
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{
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/* It's an IP V4 address: */
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if (ip_type(src))
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dst = inet_cidr_ntop(AF_INET, &ip_v4addr(src), ip_bits(src),
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tmp, sizeof(tmp));
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else
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dst = inet_net_ntop(AF_INET, &ip_v4addr(src), ip_bits(src),
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tmp, sizeof(tmp));
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if (dst == NULL)
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elog(ERROR, "unable to print address (%s)", strerror(errno));
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}
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else
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/* Go for an IPV6 address here, before faulting out: */
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elog(ERROR, "unknown address family (%d)", ip_family(src));
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dst = palloc(strlen(tmp) + 1);
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if (dst == NULL)
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elog(ERROR, "unable to allocate memory in inet_out()");
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strcpy(dst, tmp);
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return dst;
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}
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/* just a stub */
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char *
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cidr_out(inet *src)
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{
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return inet_out(src);
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}
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/*
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* Boolean tests for magnitude. Add V4/V6 testing!
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*/
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bool
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network_lt(inet *a1, inet *a2)
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{
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if (!PointerIsValid(a1) || !PointerIsValid(a2))
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return FALSE;
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if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
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{
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int order = v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a2));
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return ((order < 0) || ((order == 0) && (ip_bits(a1) < ip_bits(a2))));
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}
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else
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{
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/* Go for an IPV6 address here, before faulting out: */
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elog(ERROR, "cannot compare address families %d and %d",
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ip_family(a1), ip_family(a2));
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return FALSE;
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}
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}
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bool
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network_le(inet *a1, inet *a2)
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{
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if (!PointerIsValid(a1) || !PointerIsValid(a2))
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return FALSE;
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return (network_lt(a1, a2) || network_eq(a1, a2));
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}
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bool
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network_eq(inet *a1, inet *a2)
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{
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if (!PointerIsValid(a1) || !PointerIsValid(a2))
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return FALSE;
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if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
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{
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return ((ip_bits(a1) == ip_bits(a2))
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&& (v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a1)) == 0));
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}
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else
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{
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/* Go for an IPV6 address here, before faulting out: */
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elog(ERROR, "cannot compare address families %d and %d",
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ip_family(a1), ip_family(a2));
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return FALSE;
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}
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}
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bool
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network_ge(inet *a1, inet *a2)
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{
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if (!PointerIsValid(a1) || !PointerIsValid(a2))
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return FALSE;
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return (network_gt(a1, a2) || network_eq(a1, a2));
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}
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bool
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network_gt(inet *a1, inet *a2)
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{
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if (!PointerIsValid(a1) || !PointerIsValid(a2))
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return FALSE;
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if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
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{
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int order = v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a2));
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return ((order > 0) || ((order == 0) && (ip_bits(a1) > ip_bits(a2))));
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}
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else
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{
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/* Go for an IPV6 address here, before faulting out: */
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elog(ERROR, "cannot compare address families %d and %d",
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ip_family(a1), ip_family(a2));
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return FALSE;
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}
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}
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bool
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network_ne(inet *a1, inet *a2)
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{
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if (!PointerIsValid(a1) || !PointerIsValid(a2))
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return FALSE;
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return (!network_eq(a1, a2));
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}
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bool
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network_sub(inet *a1, inet *a2)
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{
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if (!PointerIsValid(a1) || !PointerIsValid(a2))
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return FALSE;
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if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
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{
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return ((ip_bits(a1) > ip_bits(a2))
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&& (v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a2)) == 0));
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}
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else
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{
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/* Go for an IPV6 address here, before faulting out: */
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elog(ERROR, "cannot compare address families %d and %d",
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ip_family(a1), ip_family(a2));
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return FALSE;
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}
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}
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bool
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network_subeq(inet *a1, inet *a2)
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{
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if (!PointerIsValid(a1) || !PointerIsValid(a2))
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return FALSE;
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if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
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{
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return ((ip_bits(a1) >= ip_bits(a2))
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&& (v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a2)) == 0));
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}
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else
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{
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/* Go for an IPV6 address here, before faulting out: */
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elog(ERROR, "cannot compare address families %d and %d",
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ip_family(a1), ip_family(a2));
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return FALSE;
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}
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}
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bool
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network_sup(inet *a1, inet *a2)
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{
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if (!PointerIsValid(a1) || !PointerIsValid(a2))
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return FALSE;
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if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
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{
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return ((ip_bits(a1) < ip_bits(a2))
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&& (v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a1)) == 0));
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}
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else
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{
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/* Go for an IPV6 address here, before faulting out: */
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elog(ERROR, "cannot compare address families %d and %d",
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ip_family(a1), ip_family(a2));
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return FALSE;
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}
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}
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bool
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network_supeq(inet *a1, inet *a2)
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{
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if (!PointerIsValid(a1) || !PointerIsValid(a2))
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return FALSE;
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if ((ip_family(a1) == AF_INET) && (ip_family(a2) == AF_INET))
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{
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return ((ip_bits(a1) <= ip_bits(a2))
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&& (v4bitncmp(ip_v4addr(a1), ip_v4addr(a2), ip_bits(a1)) == 0));
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}
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else
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{
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/* Go for an IPV6 address here, before faulting out: */
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elog(ERROR, "cannot compare address families %d and %d",
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ip_family(a1), ip_family(a2));
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return FALSE;
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}
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}
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/*
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* Comparison function for sorting. Add V4/V6 testing!
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*/
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int4
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network_cmp(inet *a1, inet *a2)
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{
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if (ntohl(ip_v4addr(a1)) < ntohl(ip_v4addr(a2)))
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return (-1);
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if (ntohl(ip_v4addr(a1)) > ntohl(ip_v4addr(a2)))
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return (1);
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if (ip_bits(a1) < ip_bits(a2))
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return (-1);
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if (ip_bits(a1) > ip_bits(a2))
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return (1);
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return 0;
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}
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text *
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network_host(inet *ip)
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{
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text *ret;
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int len;
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char *ptr,
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tmp[sizeof("255.255.255.255/32")];
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if (!PointerIsValid(ip))
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return NULL;
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if (ip_type(ip))
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elog(ERROR, "CIDR type has no host part");
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if (ip_family(ip) == AF_INET)
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{
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/* It's an IP V4 address: */
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if (inet_net_ntop(AF_INET, &ip_v4addr(ip), 32, tmp, sizeof(tmp)) == NULL)
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elog(ERROR, "unable to print host (%s)", strerror(errno));
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}
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else
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/* Go for an IPV6 address here, before faulting out: */
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elog(ERROR, "unknown address family (%d)", ip_family(ip));
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if ((ptr = strchr(tmp, '/')) != NULL)
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*ptr = 0;
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len = VARHDRSZ + strlen(tmp) + 1;
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ret = palloc(len);
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if (ret == NULL)
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elog(ERROR, "unable to allocate memory in network_host()");
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VARSIZE(ret) = len;
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strcpy(VARDATA(ret), tmp);
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return (ret);
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}
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int4
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network_masklen(inet *ip)
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{
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if (!PointerIsValid(ip))
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return 0;
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return ip_bits(ip);
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}
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text *
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network_broadcast(inet *ip)
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{
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text *ret;
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int len;
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char *ptr,
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tmp[sizeof("255.255.255.255/32")];
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if (!PointerIsValid(ip))
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return NULL;
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if (ip_family(ip) == AF_INET)
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{
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/* It's an IP V4 address: */
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int addr;
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unsigned long mask = 0xffffffff;
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if (ip_bits(ip) < 32)
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mask >>= ip_bits(ip);
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addr = htonl(ntohl(ip_v4addr(ip)) | mask);
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if (inet_net_ntop(AF_INET, &addr, 32, tmp, sizeof(tmp)) == NULL)
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elog(ERROR, "unable to print address (%s)", strerror(errno));
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}
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else
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/* Go for an IPV6 address here, before faulting out: */
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elog(ERROR, "unknown address family (%d)", ip_family(ip));
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if ((ptr = strchr(tmp, '/')) != NULL)
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*ptr = 0;
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len = VARHDRSZ + strlen(tmp) + 1;
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ret = palloc(len);
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if (ret == NULL)
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elog(ERROR, "unable to allocate memory in network_broadcast()");
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VARSIZE(ret) = len;
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strcpy(VARDATA(ret), tmp);
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return (ret);
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}
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text *
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network_network(inet *ip)
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{
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text *ret;
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int len;
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char tmp[sizeof("255.255.255.255/32")];
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if (!PointerIsValid(ip))
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return NULL;
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if (ip_family(ip) == AF_INET)
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{
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/* It's an IP V4 address: */
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int addr = htonl(ntohl(ip_v4addr(ip)) & (0xffffffff << (32 - ip_bits(ip))));
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if (inet_cidr_ntop(AF_INET, &addr, ip_bits(ip), tmp, sizeof(tmp)) == NULL)
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elog(ERROR, "unable to print network (%s)", strerror(errno));
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}
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else
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/* Go for an IPV6 address here, before faulting out: */
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elog(ERROR, "unknown address family (%d)", ip_family(ip));
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len = VARHDRSZ + strlen(tmp) + 1;
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ret = palloc(len);
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if (ret == NULL)
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elog(ERROR, "unable to allocate memory in network_network()");
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VARSIZE(ret) = len;
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strcpy(VARDATA(ret), tmp);
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return (ret);
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}
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text *
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network_netmask(inet *ip)
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{
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text *ret;
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int len;
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char *ptr,
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tmp[sizeof("255.255.255.255/32")];
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if (!PointerIsValid(ip))
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return NULL;
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if (ip_family(ip) == AF_INET)
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{
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/* It's an IP V4 address: */
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int addr = htonl(ip_bits(ip) ?
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(-1 << (32 - ip_bits(ip))) & 0xffffffff : 0x00000000);
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if (inet_net_ntop(AF_INET, &addr, 32, tmp, sizeof(tmp)) == NULL)
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elog(ERROR, "unable to print netmask (%s)", strerror(errno));
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}
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else
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/* Go for an IPV6 address here, before faulting out: */
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elog(ERROR, "unknown address family (%d)", ip_family(ip));
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if ((ptr = strchr(tmp, '/')) != NULL)
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*ptr = 0;
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len = VARHDRSZ + strlen(tmp) + 1;
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ret = palloc(len);
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if (ret == NULL)
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elog(ERROR, "unable to allocate memory in network_netmask()");
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VARSIZE(ret) = len;
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strcpy(VARDATA(ret), tmp);
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return (ret);
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}
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/*
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* Bitwise comparison for V4 addresses. Add V6 implementation!
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*/
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static int
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v4bitncmp(unsigned int a1, unsigned int a2, int bits)
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{
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unsigned long mask = 0;
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int i;
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for (i = 0; i < bits; i++)
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mask = (mask >> 1) | 0x80000000;
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a1 = ntohl(a1);
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a2 = ntohl(a2);
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if ((a1 & mask) < (a2 & mask))
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return (-1);
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else if ((a1 & mask) > (a2 & mask))
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return (1);
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return (0);
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}
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