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-rw-r--r--lib/lwres/win32/lwconfig.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/lib/lwres/win32/lwconfig.c b/lib/lwres/win32/lwconfig.c
new file mode 100644
index 0000000..9a6c426
--- /dev/null
+++ b/lib/lwres/win32/lwconfig.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/* $Id: lwconfig.c,v 1.7 2007/12/14 01:40:42 marka Exp $ */
+
+/*
+ * We do this so that we may incorporate everything in the main routines
+ * so that we can take advantage of the fixes and changes made there
+ * without having to add them twice. We can then call the parse routine
+ * if there is a resolv.conf file and fetch our own data from the
+ * Windows environment otherwise.
+ */
+
+/*
+ * Note that on Win32 there is normally no resolv.conf since all information
+ * is stored in the registry. Therefore there is no ordering like the
+ * contents of resolv.conf. Since the "search" or "domain" keyword, on
+ * Win32 if a search list is found it is used, otherwise the domain name
+ * is used since they are mutually exclusive. The search list can be entered
+ * in the DNS tab of the "Advanced TCP/IP settings" window under the same place
+ * that you add your nameserver list.
+ */
+
+#define lwres_conf_parse generic_lwres_conf_parse
+#include "../lwconfig.c"
+#undef lwres_conf_parse
+
+#include <iphlpapi.h>
+
+#define TCPIP_SUBKEY \
+ "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters"
+
+void
+get_win32_searchlist(lwres_context_t *ctx) {
+ HKEY hKey;
+ BOOL keyFound = TRUE;
+ char searchlist[MAX_PATH];
+ DWORD searchlen = MAX_PATH;
+ char *cp;
+ lwres_conf_t *confdata;
+
+ REQUIRE(ctx != NULL);
+ confdata = &ctx->confdata;
+
+ memset(searchlist, 0, MAX_PATH);
+ if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, TCPIP_SUBKEY, 0, KEY_READ, &hKey)
+ != ERROR_SUCCESS)
+ keyFound = FALSE;
+
+ if (keyFound == TRUE) {
+ /* Get the named directory */
+ if (RegQueryValueEx(hKey, "SearchList", NULL, NULL,
+ (LPBYTE)searchlist, &searchlen) != ERROR_SUCCESS)
+ keyFound = FALSE;
+ RegCloseKey(hKey);
+ }
+
+ confdata->searchnxt = 0;
+
+ if (!keyFound)
+ return;
+
+ cp = strtok((char *)searchlist, ", \0");
+ while (cp != NULL) {
+ if (confdata->searchnxt == LWRES_CONFMAXSEARCH)
+ break;
+ if (strlen(cp) <= MAX_PATH && strlen(cp) > 0) {
+ confdata->search[confdata->searchnxt] = lwres_strdup(ctx, cp);
+ if (confdata->search[confdata->searchnxt] != NULL)
+ confdata->searchnxt++;
+ }
+ cp = strtok(NULL, ", \0");
+ }
+}
+
+lwres_result_t
+lwres_conf_parse(lwres_context_t *ctx, const char *filename) {
+ lwres_result_t ret;
+ lwres_conf_t *confdata;
+ FIXED_INFO * FixedInfo;
+ ULONG BufLen = sizeof(FIXED_INFO);
+ DWORD dwRetVal;
+ IP_ADDR_STRING *pIPAddr;
+
+ REQUIRE(ctx != NULL);
+ confdata = &ctx->confdata;
+ REQUIRE(confdata != NULL);
+
+ /* Use the resolver if there is one */
+ ret = generic_lwres_conf_parse(ctx, filename);
+ if ((ret != LWRES_R_NOTFOUND && ret != LWRES_R_SUCCESS) ||
+ (ret == LWRES_R_SUCCESS && confdata->nsnext > 0))
+ return (ret);
+
+ /*
+ * We didn't get any nameservers so we need to do this ourselves
+ */
+ FixedInfo = (FIXED_INFO *) GlobalAlloc(GPTR, BufLen);
+ dwRetVal = GetNetworkParams(FixedInfo, &BufLen);
+ if (dwRetVal == ERROR_BUFFER_OVERFLOW) {
+ GlobalFree(FixedInfo);
+ FixedInfo = GlobalAlloc(GPTR, BufLen);
+ dwRetVal = GetNetworkParams(FixedInfo, &BufLen);
+ }
+ if (dwRetVal != ERROR_SUCCESS) {
+ GlobalFree(FixedInfo);
+ return (LWRES_R_FAILURE);
+ }
+
+ /* Get the search list from the registry */
+ get_win32_searchlist(ctx);
+
+ /* Use only if there is no search list */
+ if (confdata->searchnxt == 0 && strlen(FixedInfo->DomainName) > 0) {
+ confdata->domainname = lwres_strdup(ctx, FixedInfo->DomainName);
+ if (confdata->domainname == NULL) {
+ GlobalFree(FixedInfo);
+ return (LWRES_R_FAILURE);
+ }
+ } else
+ confdata->domainname = NULL;
+
+ /* Get the list of nameservers */
+ pIPAddr = &FixedInfo->DnsServerList;
+ while (pIPAddr) {
+ if (confdata->nsnext >= LWRES_CONFMAXNAMESERVERS)
+ break;
+
+ ret = lwres_create_addr(pIPAddr->IpAddress.String,
+ &confdata->nameservers[confdata->nsnext++], 1);
+ if (ret != LWRES_R_SUCCESS) {
+ GlobalFree(FixedInfo);
+ return (ret);
+ }
+ pIPAddr = pIPAddr ->Next;
+ }
+
+ GlobalFree(FixedInfo);
+ return (LWRES_R_SUCCESS);
+}