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65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
#include <ruby.h>
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#include <ruby/encoding.h>
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#include <windows.h>
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#ifndef NTDDI_VERSION
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#define NTDDI_VERSION 0x06000000
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#endif
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#include <iphlpapi.h>
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static VALUE
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w32error_make_error(DWORD e)
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{
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VALUE code = ULONG2NUM(e);
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return rb_class_new_instance(1, &code, rb_path2class("Win32::Resolv::Error"));
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}
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static void
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w32error_raise(DWORD e)
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{
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rb_exc_raise(w32error_make_error(e));
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}
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static VALUE
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get_dns_server_list(VALUE self)
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{
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FIXED_INFO *fixedinfo = NULL;
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ULONG buflen = 0;
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DWORD ret;
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VALUE buf, nameservers = Qnil;
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ret = GetNetworkParams(NULL, &buflen);
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if (ret != NO_ERROR && ret != ERROR_BUFFER_OVERFLOW) {
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w32error_raise(ret);
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}
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fixedinfo = ALLOCV(buf, buflen);
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ret = GetNetworkParams(fixedinfo, &buflen);
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if (ret == NO_ERROR) {
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const IP_ADDR_STRING *ipaddr = &fixedinfo->DnsServerList;
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nameservers = rb_ary_new();
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do {
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const char *s = ipaddr->IpAddress.String;
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if (!*s) continue;
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if (strcmp(s, "0.0.0.0") == 0) continue;
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rb_ary_push(nameservers, rb_str_new_cstr(s));
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} while ((ipaddr = ipaddr->Next) != NULL);
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}
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ALLOCV_END(buf);
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if (ret != NO_ERROR) w32error_raise(ret);
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return nameservers;
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}
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void
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InitVM_resolv(void)
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{
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VALUE mWin32 = rb_define_module("Win32");
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VALUE resolv = rb_define_module_under(mWin32, "Resolv");
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VALUE singl = rb_singleton_class(resolv);
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rb_define_private_method(singl, "get_dns_server_list", get_dns_server_list, 0);
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}
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void
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Init_resolv(void)
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{
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InitVM(resolv);
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}
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