ipsec portof − get port field of an ip_address |
#include <freeswan.h> int portof(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. |