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+.TH IPSEC_ANYADDR 3 "8 Sept 2000"
+.\" RCSID $Id: anyaddr.3,v 1.1 2004/03/15 20:35:25 as Exp $
+.SH NAME
+ipsec anyaddr \- get "any" address
+.br
+ipsec isanyaddr \- test address for equality to "any" address
+.br
+ipsec unspecaddr \- get "unspecified" address
+.br
+ipsec isunspecaddr \- test address for equality to "unspecified" address
+.br
+ipsec loopbackaddr \- get loopback address
+.br
+ipsec isloopbackaddr \- test address for equality to loopback address
+.SH SYNOPSIS
+.B "#include <freeswan.h>
+.sp
+.B "const char *anyaddr(int af, ip_address *dst);"
+.br
+.B "int isanyaddr(const ip_address *src);"
+.br
+.B "const char *unspecaddr(int af, ip_address *dst);"
+.br
+.B "int isunspecaddr(const ip_address *src);"
+.br
+.B "const char *loopbackaddr(int af, ip_address *dst);"
+.br
+.B "int isloopbackaddr(const ip_address *src);"
+.SH DESCRIPTION
+These functions fill in, and test for, special values of the
+.I ip_address
+type.
+.PP
+.I Anyaddr
+fills in the destination
+.I *dst
+with the ``any'' address of address family
+.IR af
+(normally
+.B AF_INET
+or
+.BR AF_INET6 ).
+The IPv4 ``any'' address is the one embodied in the old
+.B INADDR_ANY
+macro.
+.PP
+.I Isanyaddr
+returns
+.B 1
+if the
+.I src
+address equals the ``any'' address,
+and
+.B 0
+otherwise.
+.PP
+Similarly,
+.I unspecaddr
+supplies, and
+.I isunspecaddr
+tests for,
+the ``unspecified'' address,
+which may be the same as the ``any'' address.
+.PP
+Similarly,
+.I loopbackaddr
+supplies, and
+.I islookbackaddr
+tests for,
+the loopback address.
+.PP
+.IR Anyaddr ,
+.IR unspecaddr ,
+and
+.I loopbackaddr
+return
+.B NULL
+for success and
+a pointer to a string-literal error message for failure;
+see DIAGNOSTICS.
+.SH SEE ALSO
+inet(3), ipsec_addrtot(3), ipsec_sameaddr(3)
+.SH DIAGNOSTICS
+Fatal errors in the address-supplying functions are:
+unknown address family.
+.SH HISTORY
+Written for the FreeS/WAN project by Henry Spencer.