NAME

       ipsec_portof,  ipsec_setportof,  ipsec_sockaddrof, ipsec_sockaddrlenof - get port field of an ip_address,
       set port field of an ip_address, get pointer to  internal  sockaddr  of  an  ip_address,  get  length  of
       internal sockaddr of an ip_address

SYNOPSIS

       #include <freeswan.h>

       int portof(const ip_address *src);
       void setportof(int port, ip_address *dst);
       struct sockaddr *sockaddrof(ip_address *src);
       size_t sockaddrlenof(const ip_address *src);

DESCRIPTION

       The  <freeswan.h>  internal  type  ip_address contains one of the sockaddr types internally.  Reliance on
       this feature is discouraged, but it may occasionally be necessary.   These  functions  provide  low-level
       tools for this purpose.

       Portof  and  setportof  respectively  read and write the port-number field of the internal sockaddr.  The
       values are in network byte order.

       Sockaddrof returns a pointer to the internal sockaddr, for passing to other functions.

       Sockaddrlenof reports the size of the internal sockaddr, for use in storage allocation.

SEE ALSO

       inet(3), ipsec_initaddr(3)

DIAGNOSTICS

       Portof returns -1, sockaddrof returns NULL, and sockaddrlenof returns 0 if an unknown address  family  is
       found within the ip_address.

HISTORY

       Written for the FreeS/WAN project by Henry Spencer.

BUGS

       These functions all depend on low-level details of the ip_address type, which are in principle subject to
       change.  Avoid using them unless really necessary.

                                                   8 Sept 2000                                   IPSEC_PORTOF(3)