c实现ping域名解析

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <unistd.h>

void resolve_and_ping(const char *domain) {
    struct addrinfo hints, *res, *p;
    int status;
    char ipstr[INET6_ADDRSTRLEN];

    memset(&hints, 0, sizeof hints);
    hints.ai_family = AF_UNSPEC; // AF_INET or AF_INET6 to force version
    hints.ai_socktype = SOCK_STREAM;

    if ((status = getaddrinfo(domain, NULL, &hints, &res)) != 0) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(status));
        return;
    }

    printf("IP addresses for %s:\n", domain);
    for (p = res; p != NULL; p = p->ai_next) {
        void *addr;
        if (p->ai_family == AF_INET) { // IPv4
            struct sockaddr_in *ipv4 = (struct sockaddr_in *)p->ai_addr;
            addr = &(ipv4->sin_addr);
            inet_ntop(p->ai_family, addr, ipstr, sizeof ipstr);
        } else { // IPv6
            struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)p->ai_addr;
            addr = &(ipv6->sin6_addr);
            inet_ntop(p->ai_family, addr, ipstr, sizeof ipstr);
        }
        printf("  %s\n", ipstr);

        // Ping the IP address
        char command[256];
        snprintf(command, sizeof(command), "ping -c 1 %s", ipstr);
        system(command);
    }

    freeaddrinfo(res); // free the linked list
}

int main(int argc, char *argv[]) {
    if (argc != 2) {
        fprintf(stderr, "Usage: %s <domain>\n", argv[0]);
        return 1;
    }
    resolve_and_ping(argv[1]);
    return 0;
}