dns.cpp

#include <cstdio>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>

int main() {
    struct addrinfo *res = nullptr;
    getaddrinfo("google.com", "443", nullptr, &res);

    struct addrinfo *i;

    for (i = res; i != nullptr; i = i->ai_next) {
        char str[INET6_ADDRSTRLEN];
        if (i->ai_addr->sa_family == AF_INET) {
            auto *p = (struct sockaddr_in *) i->ai_addr;
            printf("%s\n", inet_ntop(AF_INET, &p->sin_addr, str, sizeof(str)));
        } else if (i->ai_addr->sa_family == AF_INET6) {
            auto *p = (struct sockaddr_in6 *) i->ai_addr;
            printf("%s\n", inet_ntop(AF_INET6, &p->sin6_addr, str, sizeof(str)));
        }
    }
}