C: Linux C 编程 - AF_INET6

#include <stdio.h>
#include <errno.h>
#include <netinet/in.h>

#include <sys/types.h>
#include <sys/socket.h>

void main()
{
  int fd;
  struct sockaddr_in6 sockaddr;

  int fd_got;
  struct sockaddr_in6 sockaddr_got;
  int sockaddr_got_len = sizeof(struct sockaddr_in6);

  fd = socket(AF_INET6, SOCK_STREAM, 0);
  if (fd == -1)
  {
    printf("socket err: %d\n", errno);
    return;
  }

  sockaddr.sin6_family = AF_INET6;
  sockaddr.sin6_addr = in6addr_any;
  sockaddr.sin6_port = htons(2121);

  if(bind(fd, (struct sockaddr *) &sockaddr, sizeof(struct sockaddr_in6)) == -1) 
  {
    printf("bind err: %d\n", errno);
    return;
  }

  if (listen(fd, 50) == -1) 
  {
    printf("listen err: %d\n", errno);
    return;
  }

  fd_got = accept(fd, (struct sockaddr *) &sockaddr_got, &sockaddr_got_len);
  if (fd_got == -1)
  {
    return;
  }
  printf("socket: accepted, fd=%d\n", fd_got);

  close(fd_got);
  close(fd);
}

运行

# ./socket_ipv6_test0 

socket: accepted, fd=4

通过telnet连接：

在本地可以直接通过ipv4的回路地址localhost进行连接

# telnet localhost 2121

Trying ::1...

Connected to localhost.

Escape character is '^]'.

Connection closed by foreign host.

在本地也可以通过ipv6的回路地址::1进行连接

# telnet ::1 2121

Trying ::1...

Connected to ::1.

Escape character is '^]'.

Connection closed by foreign host.

通过ipv6地址进行连接

# telnet -8 fe80::20c:29ff:fe12:7803%eth0 2121

Trying fe80::20c:29ff:fe12:7803%eth0...

Connected to fe80::20c:29ff:fe12:7803%eth0.

Escape character is '^]'.

Connection closed by foreign host.