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CentOS 7.0 - man page for ipsec_isloopbackaddr (centos section 3)

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       ipsec_anyaddr,  ipsec_isanyaddr, ipsec_unspecaddr, ipsec_isunspecaddr, ipsec_loopbackaddr,
       ipsec_isloopbackaddr - get and test for addresses of type "any", "unspecified"  and  loop-
       back get "any" address

       #include <libreswan.h>

       const char *anyaddr(int af, ip_address *dst);
       int isanyaddr(const ip_address *src);
       const char *unspecaddr(int af, ip_address *dst);
       int isunspecaddr(const ip_address *src);
       const char *loopbackaddr(int af, ip_address *dst);
       int isloopbackaddr(const ip_address *src);

       These functions fill in, and test for, special values of the ip_address type.

       Anyaddr	fills in the destination *dst with the ``any'' address of address family af (nor-
       mally AF_INET or AF_INET6).  The IPv4 ``any'' address is  the  one  embodied  in  the  old
       INADDR_ANY macro.

       Isanyaddr returns 1 if the src address equals the ``any'' address, and 0 otherwise.

       Similarly,  unspecaddr  supplies, and isunspecaddr tests for, the ``unspecified'' address,
       which may be the same as the ``any'' address.

       Similarly, loopbackaddr supplies, and islookbackaddr tests for, the loopback address.

       Anyaddr, unspecaddr, and loopbackaddr return NULL for success and a pointer to  a  string-
       literal error message for failure; see DIAGNOSTICS.

       inet(3), ipsec_addrtot(3), ipsec_sameaddr(3)

       Fatal errors in the address-supplying functions are: unknown address family.

       Written for the FreeS/WAN project by Henry Spencer.

					   8 Sept 2000				 IPSEC_ANYADDR(3)
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