问题描述
据我所知,IPv6 环回是 ::1
。所以当我尝试这个时:
//includes of all needed headers in one place
#include <include.h>
#define BACKLOG 10
int main(int argc,char const *argv[])
{
if (argc != 2)
{
die("Usage: %s <port>\n",argv[0]);
}
int port = atoi(argv[1]);
int numOfClient = 0;
int sockfd = socket(AF_INET6,SOCK_STREAM,0);
struct sockaddr_in servaddr;
servaddr.sin_family = AF_INET6;
servaddr.sin_addr.s_addr = INADDR_ANY;
servaddr.sin_port = htons(port);
if (bind(sockfd,(struct sockaddr *)&servaddr,sizeof(servaddr)) < 0)
{
perror("bind");
}
else
{
printf("[+]bind\n");
}
if (listen(sockfd,BACKLOG) < 0)
{
perror("listen");
}
else
{
printf("[+]listening\n");
}
while (1)
{
int client_sockfd = accept(sockfd,NULL,NULL);
time_t Now = time(NULL);
char *time_fmt = ctime(&Now);
numOfClient++;
printf("client %d requested for time at %s\n",numOfClient,time_fmt);
if (write(client_sockfd,time_fmt,strlen(time_fmt) + 1) < 0)
{
die("died: write to client_sockfd\n");
}
}
return 0;
}
并尝试将其运行为:
$ # run with random port 4444
$ ./server6 4444
bind: Invalid argument
[+]listening
IF_INET
套接字没有问题,但是 IF_INET6
似乎有某种问题。可能是什么?
解决方法
您使用了错误的 sockaddr 结构类型。对于 IPv6,您需要使用 <script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
。
struct sockaddr_in6
或者:
struct sockaddr_in6 servaddr = { .sin6_family = AF_INET6,.sin6_addr = IN6ADDR_ANY_INIT,.sin6_port = htons(port));