2

操作系统是 Ubuntu。我正在为基本的 IPv6 操作做一个简单的测试。PC通过集线器连接IP Camera（支持IPv6），ping6测试成功。

$ ping6 -I eth1 fe80::240:8cff:fe94:451e
PING fe80::240:8cff:fe94:451e(fe80::240:8cff:fe94:451e) from fe80::224:8cff:fe90:ad3b eth1: 56 data bytes
64 bytes from fe80::240:8cff:fe94:451e: icmp_seq=1 ttl=64 time=3.86 ms
64 bytes from fe80::240:8cff:fe94:451e: icmp_seq=2 ttl=64 time=0.471 ms

代码如下：

#include <linux/in6.h>
#include <sys/socket.h>
#include <stdio.h>
#include <errno.h>

void main()
{
  int s, ret, err;
  struct sockaddr_in6 addr;

  s = socket(AF_INET6, SOCK_STREAM, 0);
  addr.sin6_family = AF_INET6;
  addr.sin6_port = htons(554);
  addr.sin6_flowinfo = 0;
  addr.sin6_scope_id = 0;
  addr.sin6_addr.s6_addr[0] = 0xfe;
  addr.sin6_addr.s6_addr[1] = 0x80;
  addr.sin6_addr.s6_addr[2] = 0x00;
  addr.sin6_addr.s6_addr[3] = 0x00;
  addr.sin6_addr.s6_addr[4] = 0x00;
  addr.sin6_addr.s6_addr[5] = 0x00;  
  addr.sin6_addr.s6_addr[6] = 0x00;
  addr.sin6_addr.s6_addr[7] = 0x00;
  addr.sin6_addr.s6_addr[8] = 0x02;
  addr.sin6_addr.s6_addr[9] = 0x40;
  addr.sin6_addr.s6_addr[10] = 0x8c;
  addr.sin6_addr.s6_addr[11] = 0xff;
  addr.sin6_addr.s6_addr[12] = 0xfe;
  addr.sin6_addr.s6_addr[13] = 0x94;
  addr.sin6_addr.s6_addr[14] = 0x45;
  addr.sin6_addr.s6_addr[15] = 0x1e;

  ret = connect(s, (struct sockaddr*)&addr, sizeof(addr));
  if (ret == -1)
  {
    err = errno;
    printf("connect failure, errno = %d\n", err);
  }
}

结果总是“connect failure,errno = 22” 问题出在哪里？

4

1 回答 1

11

如果您要使用链接本地地址，则必须设置sin6_scope_id以匹配链接上网络设备的设备索引（这就是您必须指定-I eth1命令的原因ping6）。

您可以getaddrinfo()为您完成所有艰苦的工作，包括设置范围 ID（注意%eth1地址末尾的）和端口：

struct addrinfo hints = { 0 };
struct addrinfo *res;
int gai_err;
int s;

hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_STREAM;

gai_err = getaddrinfo("fe80::240:8cff:fe94:451e%eth1", "554", &hints, &res);

if (gai_err)
{
    fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai_err));
    return 1;
}

s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);

if (s < 0) {
    perror("socket");
    return 1;
}

if (connect(s, res->ai_addr, res->ai_addrlen) < 0) {
    perror("connect");
    return 1;
}
于 2011-07-22T11:02:46.503 回答