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IPSEC_SAMEADDR(3)								IPSEC_SAMEADDR(3)

NAME
       ipsec_sameaddr, ipsec_addrcmp, ipsec_samesubnet, ipsec_addrinsubnet, ipsec_subnetinsubnet,
       ipsec_subnetishost, ipsec_samesaid, ipsec_sameaddrtype, ipsec_samesubnettype - do  compar-
       isons for addresses, subnets, SA IDs and address families

SYNOPSIS
       #include <libreswan.h>

       int sameaddr(const ip_address *a, const ip_address *b);
       int addrcmp(const ip_address *a, const ip_address *b);
       int samesubnet(const ip_subnet *a, const ip_subnet *b);
       int addrinsubnet(const ip_address *a, const ip_subnet *s);
       int subnetinsubnet(const ip_subnet *a, const ip_subnet *b);
       int subnetishost(const ip_subnet *s);
       int samesaid(const ip_said *a, const ip_said *b);
       int sameaddrtype(const ip_address *a, const ip_address *b);
       int samesubnettype(const ip_subnet *a, const ip_subnet *b);

DESCRIPTION
       These  functions  do  various  comparisons  and tests on the ip_address type and ip_subnet
       types.

       Sameaddr returns non-zero if addresses a and b are identical, and 0 otherwise.	Addresses
       of different families are never identical.

       Addrcmp	returns  -1, 0, or 1 respectively if address a is less than, equal to, or greater
       than 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.

       Samesubnet returns non-zero if subnets a and b are identical, and 0 otherwise.  Subnets of
       different address families are never identical.

       Addrinsubnet returns non-zero if address a is within subnet s and 0 otherwise.  An address
       is never within a subnet of a different address family.

       Subnetinsubnet  returns	non-zero  if subnet a is a subset of subnet b and 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.

       Subnetishost returns non-zero if subnet s is in fact only a single host, and 0 otherwise.

       Samesaid returns non-zero if SA IDs a and b are identical, and 0 otherwise.

       Sameaddrtype  returns  non-zero if addresses a and b are of the same address family, and 0
       otherwise.

       Samesubnettype returns non-zero if subnets a and b are of the same address family,  and	0
       otherwise.

SEE ALSO
       inet(3), ipsec_initaddr(3)

HISTORY
       Written for the FreeS/WAN project by Henry Spencer.

					   28 Nov 2000				IPSEC_SAMEADDR(3)
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