c - 绑定:尝试将 AF_INET6 绑定到 INADDR_ANY(到 localhost)时参数无效
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IF_INET6
似乎有某种问题。可能是什么?
解决方案
您使用了错误的 sockaddr 结构类型。对于 IPv6,您需要使用struct sockaddr_in6
.
struct sockaddr_in6 servaddr = { .sin6_family = AF_INET6,
.sin6_addr = IN6ADDR_ANY_INIT,
.sin6_port = htons(port));
或者:
struct sockaddr_in6 servaddr = {0};
servaddr.sin6_family = AF_INET6;
servaddr.sin6_addr = in6addr_any;
servaddr.sin6_port = htons(port);
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