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+.TH IPSEC_ANYADDR 3 "28 Nov 2000"
+.\" RCSID $Id: sameaddr.3,v 1.1 2004/03/15 20:35:26 as Exp $
+.SH NAME
+ipsec sameaddr \- are two addresses the same?
+.br
+ipsec addrcmp \- ordered comparison of addresses
+.br
+ipsec samesubnet \- are two subnets the same?
+.br
+ipsec addrinsubnet \- is an address within a subnet?
+.br
+ipsec subnetinsubnet \- is a subnet within another subnet?
+.br
+ipsec subnetishost \- is a subnet a single host?
+.br
+ipsec samesaid \- are two SA IDs the same?
+.br
+ipsec sameaddrtype \- are two addresses of the same address family?
+.br
+ipsec samesubnettype \- are two subnets of the same address family?
+.SH SYNOPSIS
+.B "#include <freeswan.h>
+.sp
+.B "int sameaddr(const ip_address *a, const ip_address *b);"
+.br
+.B "int addrcmp(const ip_address *a, const ip_address *b);"
+.br
+.B "int samesubnet(const ip_subnet *a, const ip_subnet *b);"
+.br
+.B "int addrinsubnet(const ip_address *a, const ip_subnet *s);"
+.br
+.B "int subnetinsubnet(const ip_subnet *a, const ip_subnet *b);"
+.br
+.B "int subnetishost(const ip_subnet *s);"
+.br
+.B "int samesaid(const ip_said *a, const ip_said *b);"
+.br
+.B "int sameaddrtype(const ip_address *a, const ip_address *b);"
+.br
+.B "int samesubnettype(const ip_subnet *a, const ip_subnet *b);"
+.SH DESCRIPTION
+These functions do various comparisons and tests on the
+.I ip_address
+type and
+.I ip_subnet
+types.
+.PP
+.I Sameaddr
+returns
+non-zero
+if addresses
+.I a
+and
+.IR b
+are identical,
+and
+.B 0
+otherwise.
+Addresses of different families are never identical.
+.PP
+.I Addrcmp
+returns
+.BR \-1 ,
+.BR 0 ,
+or
+.BR 1
+respectively
+if address
+.I a
+is less than, equal to, or greater than
+.IR b .
+If they are not of the same address family,
+they are never equal;
+the ordering reported in this case is arbitrary
+(and probably not useful) but consistent.
+.PP
+.I Samesubnet
+returns
+non-zero
+if subnets
+.I a
+and
+.IR b
+are identical,
+and
+.B 0
+otherwise.
+Subnets of different address families are never identical.
+.PP
+.I Addrinsubnet
+returns
+non-zero
+if address
+.I a
+is within subnet
+.IR s
+and
+.B 0
+otherwise.
+An address is never within a
+subnet of a different address family.
+.PP
+.I Subnetinsubnet
+returns
+non-zero
+if subnet
+.I a
+is a subset of subnet
+.IR b
+and
+.B 0
+otherwise.
+A subnet is deemed to be a subset of itself.
+A subnet is never a subset of another
+subnet if their address families differ.
+.PP
+.I Subnetishost
+returns
+non-zero
+if subnet
+.I s
+is in fact only a single host,
+and
+.B 0
+otherwise.
+.PP
+.I Samesaid
+returns
+non-zero
+if SA IDs
+.I a
+and
+.IR b
+are identical,
+and
+.B 0
+otherwise.
+.PP
+.I Sameaddrtype
+returns
+non-zero
+if addresses
+.I a
+and
+.IR b
+are of the same address family,
+and
+.B 0
+otherwise.
+.PP
+.I Samesubnettype
+returns
+non-zero
+if subnets
+.I a
+and
+.IR b
+are of the same address family,
+and
+.B 0
+otherwise.
+.SH SEE ALSO
+inet(3), ipsec_initaddr(3)
+.SH HISTORY
+Written for the FreeS/WAN project by Henry Spencer.