2 2 2.1 AF_INET6: The Address Family for (Web design software)
2 2 2.1 AF_INET6: The Address Family for IPv6 As we have seen in Chapter 1, on the socket API we use a constant AF_INET to identify IPv4 sockets. Also, to identify IPv4 peers on the socket we have used C structure, called sockaddr_in. To handle IPv6 on the socket API, we use a constant called AF_INET6. The expression is as follows: s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); This could be rewritten as: s = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP); to initialize an IPv6 socket into variable s. The following code shows the definition of sockaddr_in and sockaddr_in6: Definition of sockaddr_in: struct sockaddr_in { u_int8_t sin_len; /* length of sockaddr */ u_int8_t sin_family; /* address family */ u_int16_t sin_port; /* TCP/UDP port number */ struct in_addr sin_addr; /* IPv4 address */ int8_t sin_zero[8]; /* padding */ }; Definition of sockaddr_in6: struct sockaddr_in6 { u_int8_t sin6_len; /* length of this struct (socklen_t) */ u_int8_t sin6_family; /* AF_INET6 (sa_family_t) */ u_int16_t sin6_port; /* Transport layer port */ 13
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