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       ipsec_portof - get port field of an ip_address
       ipsec setportof - set port field of an ip_address
       ipsec sockaddrof - get pointer to internal sockaddr of an ip_address
       ipsec sockaddrlenof - get length of internal sockaddr of an ip_address


       #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);


       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.


       inet(3), ipsec_initaddr(3)


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


       Written for the FreeS/WAN project by Henry Spencer.


       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