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16 2.2 Why Programs Need to Be Address-Family Independent? 16 2.2 Why Programs Need to Be Address-Family Independent? ; /*NOTREACHED*/ } /* DNS name lookup */ hp = gethostbyname(hostname); if (!hp) { fprintf(stderr, host not foundn ); exit(1); /*NOTREACHED*/ } if (hp->h_length != sizeof(sin.sin_addr)) { fprintf(stderr, invalid address sizen ); exit(1); /*NOTREACHED*/ } memset(&sin, 0, sizeof(sin)); sin.sin_family = AF_INET; salen = sin.sin_len = sizeof(struct sockaddr_in); memcpy(&sin.sin_addr, hp->h_addr, sizeof(sin.sin_addr)); sin.sin_port = htons(80); /* connect to the peer */ if (connect(s, (struct sockaddr *)&sin, salen) 0) { perror( connect ); exit(1); } Program 2.2 Program rewritten to support IPv6 with AF_INET6 hardcoded THIS METHOD IS NOT RECOMMENDED /* * AF_INET6 code - the book recommend AGAINST rewriting applications * like this. */ struct sockaddr_in6 sin6; socklen_t salen; struct hostent *hp; /* open the socket - IPv6 only, no IPv4 support */ s = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP); if (s < 0) { perror( socket ); exit(1); /*NOTREACHED*/ } /* DNS name lookup - does not support scope ID */ hp = gethostbyname2(hostname, AF_INET6); if (!hp) { fprintf(stderr, host not foundn ); exit(1); /*NOTREACHED*/ }
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