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+.TH IPSEC_PORTOF 3 "8 Sept 2000"
+.\" RCSID $Id: portof.3,v 1.1 2004/03/15 20:35:26 as Exp $
+.SH NAME
+ipsec portof \- get port field of an ip_address
+.br
+ipsec setportof \- set port field of an ip_address
+.br
+ipsec sockaddrof \- get pointer to internal sockaddr of an ip_address
+.br
+ipsec sockaddrlenof \- get length of internal sockaddr of an ip_address
+.SH SYNOPSIS
+.B "#include <freeswan.h>"
+.sp
+.B "int portof(const ip_address *src);"
+.br
+.B "void setportof(int port, ip_address *dst);"
+.br
+.B "struct sockaddr *sockaddrof(ip_address *src);"
+.br
+.B "size_t sockaddrlenof(const ip_address *src);"
+.SH DESCRIPTION
+The
+.B <freeswan.h>
+internal type
+.I ip_address
+contains one of the
+.I sockaddr
+types internally.
+\fIReliance on this feature is discouraged\fR,
+but it may occasionally be necessary.
+These functions provide low-level tools for this purpose.
+.PP
+.I Portof
+and
+.I setportof
+respectively read and write the port-number field of the internal
+.IR sockaddr .
+The values are in network byte order.
+.PP
+.I Sockaddrof
+returns a pointer to the internal
+.IR sockaddr ,
+for passing to other functions.
+.PP
+.I Sockaddrlenof
+reports the size of the internal
+.IR sockaddr ,
+for use in storage allocation.
+.SH SEE ALSO
+inet(3), ipsec_initaddr(3)
+.SH DIAGNOSTICS
+.I Portof
+returns
+.BR \-1 ,
+.I sockaddrof
+returns
+.BR NULL ,
+and
+.I sockaddrlenof
+returns
+.B 0
+if an unknown address family is found within the
+.IR ip_address .
+.SH HISTORY
+Written for the FreeS/WAN project by Henry Spencer.
+.SH BUGS
+These functions all depend on low-level details of the
+.I ip_address
+type, which are in principle subject to change.
+Avoid using them unless really necessary.