43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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static void v4_to_v6(const struct in_addr *v4, struct in6_addr *v6) {
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memset(v6, 0, sizeof(*v6));
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v6->s6_addr[10]=0xff;
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v6->s6_addr[11]=0xff;
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memcpy(&v6->s6_addr[12], &v4->s_addr, 4);
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}
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int main(void) {
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struct addrinfo *result;
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struct addrinfo *res;
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const struct addrinfo hints = { .ai_family = AF_INET };
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int error, sock;
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/* resolve the domain name into a list of addresses */
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error = getaddrinfo("www.example.com", NULL, &hints, &result);
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if (error != 0) {
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fprintf(stderr, "error in getaddrinfo: %s\n", gai_strerror(error));
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return EXIT_FAILURE;
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}
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if((sock=socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
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perror("socket");
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return EXIT_FAILURE;
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}
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struct sockaddr_in6 a = { .sin6_family = AF_INET6,
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.sin6_port = htons(80) };
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v4_to_v6(&((struct sockaddr_in *)result->ai_addr)->sin_addr, &a.sin6_addr);
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freeaddrinfo(result);
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if((error = connect(sock, (struct sockaddr *)&a, sizeof(a))) == -1) {
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perror("connect");
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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