#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
int main() {
struct addrinfo hints, *res, *p;
int status;
char ipstr[INET6_ADDRSTRLEN];
// 设置hints结构体,指定我们想要获取的地址类型
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC; // AF_INET 或 AF_INET6 以获取 IPv4 或 IPv6 地址
hints.ai_socktype = SOCK_STREAM; // TCP 流套接字
// 获取地址信息
if ((status = getaddrinfo("www.baidu.com", NULL, &hints, &res)) != 0) {
fprintf(stderr, "getaddrinfo error: %s\n", gai_strerror(status));
return 1;
}
printf("IP addresses for www.baidu.com:\n\n");
// 遍历所有获取到的地址
for(p = res; p != NULL; p = p->ai_next) {
void *addr;
char *ipver;
// 获取IP地址
if (p->ai_family == AF_INET) { // IPv4
struct sockaddr_in *ipv4 = (struct sockaddr_in *)p->ai_addr;
addr = &(ipv4->sin_addr);
ipver = "IPv4";
} else { // IPv6
struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)p->ai_addr;
addr = &(ipv6->sin6_addr);
ipver = "IPv6";
}
// 将IP地址转换为字符串
inet_ntop(p->ai_family, addr, ipstr, sizeof ipstr);
printf("%s: %s\n", ipver, ipstr);
}
// 释放addrinfo结构体
freeaddrinfo(res);
return 0;
}
标签:并打印,baidu,getaddrinfo,addr,ai,struct,IPv4,include,hints
From: https://www.cnblogs.com/CamelliaWY/p/18246825