iOS - 仅在IPv6网络上获取设备的DNS服务器地址 [英] iOS - Get device's DNS server address on IPv6 only network

问题描述

我正在尝试在iOS上连接到仅IPv6网络时获取设备的DNS服务器地址。以下代码在连接到IPv4网络时不起作用，但在IPv6网络上不起作用。从答案获取的代码。

I am trying to get device's DNS server address while connected to IPv6 only network on iOS. The following code works well for when connected to IPv4 network but doesn't work on IPv6 network. Code taken from this answer.

res_ninit(&_res);
res_state res = &_res;

for (int i=0; i < res->nscount; i++) {
    sa_family_t family = res->nsaddr_list[i].sin_family;

    if (family == AF_INET) {
      NSLog(@"IPv4");
      char str[INET_ADDRSTRLEN]; // String representation of address
      inet_ntop(AF_INET, & (res->nsaddr_list[i].sin_addr.s_addr), str, INET_ADDRSTRLEN);
    } else if (family == AF_INET6) {
      NSLog(@"IPv6");
      char address[INET6_ADDRSTRLEN]; // String representation of address
      inet_ntop(AF_INET6, &(res->nsaddr_list [i].sin_addr.s_addr), address, INET6_ADDRSTRLEN);
    } else {
      NSLog(@"Unspecified");
    }
}

在IPv6网络上， sin_family 始终是 AF_UNSPEC 。任何建议/替代品？

On IPv6 network, sin_family is always AF_UNSPEC. Any suggestions/alternatives?

推荐答案

尝试使用res._u._ext.nsaddrs进行IPv6。

Try using res._u._ext.nsaddrs for IPv6.

请参阅 https：//chromium.googlesource。 com / chromium / src / + / master / net / dns / dns_config_service_posix.cc＃437

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