---
name: "sameaddr"
section: "3"
platform: "linux"
package: "strongswan"
version: "4.2.4-5+lenny3"
release: "Debian 5.0 (Lenny)"
platforms: ["linux"]
url: "https://new.carta.tech/sameaddr"
---

# sameaddr(3)

are two addresses the same? ipsec addrcmp - ordered comparison of addresses ipsec samesubnet - are two subnets the same? ipsec addrinsubnet - is an address within a subnet? ipsec subnetinsubnet - is a subnet within another subnet? ipsec subnetishost - is a subnet a single host? ipsec samesaid - are two SA IDs the same? ipsec sameaddrtype - are two addresses of the same address family? ipsec samesubnettype - are two subnets of the same address family?

## NAME

ipsec sameaddr - are two addresses the same?\
 ipsec addrcmp - ordered comparison of addresses\
 ipsec samesubnet - are two subnets the same?\
 ipsec addrinsubnet - is an address within a subnet?\
 ipsec subnetinsubnet - is a subnet within another subnet?\
 ipsec subnetishost - is a subnet a single host?\
 ipsec samesaid - are two SA IDs the same?\
 ipsec sameaddrtype - are two addresses of the same address family?\
 ipsec samesubnettype - are two subnets of the same address family?

## SYNOPSIS

**#include \<freeswan.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)](/inet/3.md), [ipsec\_initaddr(3)](/ipsec_initaddr/3.md)

## HISTORY

Written for the FreeS/WAN project by Henry Spencer.