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#include <errno.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <string.h>
int main()
{
struct addrinfo req;
void *ptr;
memset(&req, 0, sizeof(req));
struct addrinfo *res, *i;
int ret = 0;
char buf[NI_MAXHOST];
req.ai_family = AF_UNSPEC;
req.ai_socktype = SOCK_DGRAM;
ret = getaddrinfo("fb.com", NULL, &req, &res);
if (ret == 0) {
while (res) {
memset(buf, 0, NI_MAXHOST);
if (res->ai_family == AF_INET6) {
ptr = &((struct sockaddr_in6*)res->ai_addr)->sin6_addr;
inet_ntop(AF_INET6, ptr, buf, NI_MAXHOST);
printf("%s\n", buf);
} else if (res->ai_family == AF_INET) {
ptr = &((struct sockaddr_in*)res->ai_addr)->sin_addr;
inet_ntop(AF_INET, ptr, buf, NI_MAXHOST);
printf("%s\n", buf);
}
res = res->ai_next;
}
} else {
printf("invalid %s\n", gai_strerror(ret));
}
}
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