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windows: async dns find DNS server using modern api

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This commit is contained in:
Andy Green 2020-04-16 18:49:15 +01:00
parent a8ad5068e4
commit 8299bd4191
1 changed files with 14 additions and 37 deletions
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51
lib/plat/windows/windows-resolv.c
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@ -1,16 +1,4 @@
/*
* Adapted from tadns 1.1, from http://adns.sourceforge.net/
* Original license -->
*
* Copyright (c) 2004-2005 Sergey Lyubka <valenok@gmail.com>
*
* "THE BEER-WARE LICENSE" (Revision 42):
* Sergey Lyubka wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return.
*
* Integrated into lws, largely rewritten and relicensed (as allowed above)
*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
@ -35,39 +23,28 @@
*/
#include "private-lib-core.h"
#include <iphlpapi.h>
lws_async_dns_server_check_t
lws_plat_asyncdns_init(struct lws_context *context, lws_sockaddr46 *sa46)
{
char subkey[512], value[128], *key =
"SYSTEM\\ControlSet001\\Services\\Tcpip\\Parameters\\Interfaces";
HKEY hKey, hSub;
LONG err;
int i, n;
unsigned long ul;
FIXED_INFO fi;
int n;
if ((err = RegOpenKey(HKEY_LOCAL_MACHINE, key, &hKey)) != ERROR_SUCCESS) {
lwsl_err("%s: cannot open reg key %s: %d\n", __func__, key, err);
ul = sizeof(fi);
if (GetNetworkParams(&fi, &ul) != NO_ERROR) {
lwsl_err("%s: can't get dns servers\n", __func__);
return 1;
return LADNS_CONF_SERVER_UNKNOWN;
}
for (i = 0; RegEnumKey(hKey, i, subkey, sizeof(subkey)) == ERROR_SUCCESS; i++) {
DWORD type, len = sizeof(value);
lwsl_info("%s: trying %s\n", __func__,
fi.DnsServerList.IpAddress.String);
n = lws_sa46_parse_numeric_address(
fi.DnsServerList.IpAddress.String, sa46);
if (RegOpenKey(hKey, subkey, &hSub) == ERROR_SUCCESS &&
(RegQueryValueEx(hSub, "NameServer", 0,
&type, value, &len) == ERROR_SUCCESS ||
RegQueryValueEx(hSub, "DhcpNameServer", 0,
&type, value, &len) == ERROR_SUCCESS)) {
n = lws_sa46_parse_numeric_address(value, sa46);
RegCloseKey(hSub);
RegCloseKey(hKey);
return n == 0 ? LADNS_CONF_SERVER_CHANGED :
LADNS_CONF_SERVER_UNKNOWN;
}
}
RegCloseKey(hKey);
return LADNS_CONF_SERVER_UNKNOWN;
return n == 0 ? LADNS_CONF_SERVER_CHANGED :
LADNS_CONF_SERVER_UNKNOWN;
}