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