GetAddrInfo无法解析ipv6.google.com（但是nslookup可以） [英] GetAddrInfo cannot resolve ipv6.google.com (but nslookup can)

问题描述

我可以尝试使用 GetAddrInfo 来解决 ipv6。 google.com ：

i can trying to use GetAddrInfo to resolve ipv6.google.com:

wsaError = getaddrinfo("ipv6.google.com", null, null, ref addrInfo);

返回的套接字错误代码为 11001

The returned socket error code is 11001 (No such host is known).

注意：已弃用的旧版功能 GetHostByName 不支持IPv6。已被 的getaddrinfo 。

Note: The deprecated legacy function GetHostByName does not support IPv6. It has been replaced with GetAddrInfo.

奇怪的是，我可以使用 nslookup ，它可以找到地址很好：

The strange thing is that i can use nslookup and it can find the address just fine:

问题

SendRequest(), len 33
    HEADER:
        opcode = QUERY, id = 4, rcode = NOERROR
        header flags:  query, want recursion
        questions = 1,  answers = 0,  authority records = 0,  additional = 0

    QUESTIONS:
        ipv6.google.com, type = A, class = IN

权威答案

Got answer (106 bytes):
    HEADER:
        opcode = QUERY, id = 4, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 1,  authority records = 1,  additional = 0

    QUESTIONS:
        ipv6.google.com, type = A, class = IN
    ANSWERS:
    ->  ipv6.google.com
        type = CNAME, class = IN, dlen = 9
        canonical name = ipv6.l.google.com
        ttl = 21743 (6 hours 2 mins 23 secs)
    AUTHORITY RECORDS:
    ->  l.google.com
        type = SOA, class = IN, dlen = 38
        ttl = 30 (30 secs)
        primary name server = ns4.google.com
        responsible mail addr = dns-admin.google.com
        serial  = 1486713
        refresh = 900 (15 mins)
        retry   = 900 (15 mins)
        expire  = 1800 (30 mins)
        default TTL = 60 (1 min)

非权威性问题

SendRequest(), len 33
    HEADER:
        opcode = QUERY, id = 5, rcode = NOERROR
        header flags:  query, want recursion
        questions = 1,  answers = 0,  authority records = 0,  additional = 0

    QUESTIONS:
        ipv6.google.com, type = AAAA, class = IN

非授权答案

Got answer (82 bytes):
    HEADER:
        opcode = QUERY, id = 5, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 2,  authority records = 0,  additional = 0

    QUESTIONS:
        ipv6.google.com, type = AAAA, class = IN
    ANSWERS:
    ->  ipv6.google.com
        type = CNAME, class = IN, dlen = 9
        canonical name = ipv6.l.google.com
        ttl = 21743 (6 hours 2 mins 23 secs)
    ->  ipv6.l.google.com
        type = AAAA, class = IN, dlen = 16
        AAAA IPv6 address = 2607:f8b0:4009:801::1012
        ttl = 270 (4 mins 30 secs)

------------
Name:    ipv6.l.google.com
Address:  2607:f8b0:4009:801::1012
Aliases:  ipv6.google.com

什么可以导致 nslookup 可以在 GetAddrInfo 不能？我可以使用 GetAddrInfo 做不同的工作吗？

What can cause nslookup to be able to resolve an address when GetAddrInfo cannot? And what can i do differently with GetAddrInfo so it works?

推荐答案

尝试通过 pHints 参数中的 AF_INET6 来处理IPV6地址。这似乎对我有用：

Try passing AF_INET6 in pHints parameter to work with IPV6 addresses. This seems to be working for me:

struct addrinfo *result = NULL;
struct addrinfo hints;

ZeroMemory( &hints, sizeof(hints) );
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;

dwRetval = getaddrinfo("ipv6.google.com", NULL, &hints, &result);
// check your dwRetval here ...

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