2.2.32.5.1 SOCKADDR_STORAGE

Socket Address Information is a 128-byte structure formatted as follows:

0	1	2	3	4	5	6	7	8	9	1 0	1	2	3	4	5	6	7	8	9	2 0	1	2	3	4	5	6	7	8	9	3 0	1
Family																Buffer (variable)
...
Reserved (variable)
...

Family (2 bytes): Address family of the socket. This field MUST contain one of the following values:

Value	Meaning
InterNetwork 0x0002	When set, indicates an IPv4 address in the socket.
InterNetworkV6 0x0017	When set, indicates an IPv6 address in the socket.

Buffer (variable): A variable-length buffer that contains the socket address information. If the value of the field Family is 0x0002, this field MUST be interpreted as SOCKADDR_IN, specified in 2.2.32.5.1.1. Otherwise, if the value of the field Family is 0x0017, this field MUST be interpreted as SOCKADDR_IN6, specified in 2.2.32.5.1.2.

Reserved (variable): The remaining bytes within the size of SOCKADDR_STORAGE structure (128 bytes) MUST NOT be used and MUST be reserved. The server SHOULD set this to zero, and the client MUST ignore it on receipt.