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PO
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Id
10843993
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1
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CreationDate
2012-06-01T03:25:37.030
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2012-06-01T03:25:37.030
LastEditDate
2017-05-23T12:26:27.260
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134633
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10523828
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2
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2
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text
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As <a href="https://stackoverflow.com/a/10773280/134633">n.m. says</a>, on Cygwin <code>res_init()</code> does not populate <code>_res.nsaddr_list</code> if it is using the Windows resolver. It uses the Windows resolver if either <code>/etc/resolv.conf</code> does not exist, or <code>/etc/resolv.conf</code> contains <code>options osquery</code>. In my opinion this is a Cygwin bug - returning a negative <code>nscount</code> is bogus - but nonetheless we are stuck with working around it. The solution is to call <code>GetNetworkParams()</code> just as Cygwin does itself - here's what I'm doing as a fallback: <pre><code>#include <windows.h> #include <iphlpapi.h> #include <netinet/in.h> #include <arpa/inet.h> if (_res.nscount < 0) { ULONG buflen = 0; FIXED_INFO *buf = NULL; if (GetNetworkParams(NULL, &buflen) == ERROR_BUFFER_OVERFLOW) buf = malloc(buflen); if (buf && GetNetworkParams(buf, &buflen) == NO_ERROR) { _res.nscount = 1; _res.nsaddr_list[0].sin_family = AF_INET; _res.nsaddr_list[0].sin_addr.s_addr = inet_addr(buf->DnsServerList.IpAddress.String); _res.nsaddr_list[0].sin_port = htons(53); } free(buf); } </code></pre> You need to link against <code>-liphlpapi</code> for the <code>GetNetworkParams()</code> function. This only takes the first Windows DNS address, but if you want the rest of them you can follow the linked list that <code>GetNetworkParams()</code> returns. <code>GetNetworkParams()</code> only returns IPv4 addresses, I'm not sure what you're supposed to do if the machine has an IPv6 DNS server address configured.
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1. POHow does gcc/cygwin get the DNS server?
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1. COThis gives me what I need! Thanks.
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