5 files changed, 39 insertions, 8 deletions

diff --git a/src/ext/Util/ca/precomp.h b/src/ext/Util/ca/precomp.h
index 9456c691..0d7cae18 100644
--- a/src/ext/Util/ca/precomp.h
+++ b/src/ext/Util/ca/precomp.h
@@ -51,5 +51,6 @@
 #include "scasmb.h"
 #include "scasmbexec.h"
 #include "utilca.h"
+#include "scanet.h"
 
 #include "..\..\caDecor.h"
diff --git a/src/ext/Util/ca/scaexec.cpp b/src/ext/Util/ca/scaexec.cpp
index a2ecdaab..ee3c164f 100644
--- a/src/ext/Util/ca/scaexec.cpp
+++ b/src/ext/Util/ca/scaexec.cpp
@@ -716,7 +716,7 @@ static HRESULT RemoveGroupInternal(
     //
     if (!(SCAG_DONT_CREATE_GROUP & iAttributes))
     {
-        hr = GetDomainFromServerName(&pwzServerName, wzDomain, DS_WRITABLE_REQUIRED);
+        hr = GetDomainServerName(wzDomain, &pwzServerName, DS_WRITABLE_REQUIRED);
 
         NET_API_STATUS er = ::NetLocalGroupDel(pwzServerName, wzName);
         hr = HRESULT_FROM_WIN32(er);
@@ -1284,7 +1284,7 @@ extern "C" UINT __stdcall CreateGroup(
 
     if (!(SCAG_DONT_CREATE_GROUP & iAttributes))
     {
-        hr = GetDomainFromServerName(&pwzServerName, pwzDomain, DS_WRITABLE_REQUIRED);
+        hr = GetDomainServerName(pwzDomain, &pwzServerName, DS_WRITABLE_REQUIRED);
         ExitOnFailure(hr, "failed to find writable server for domain %ls.", pwzDomain);
 
         // Set the group's comment
@@ -1680,7 +1680,7 @@ HRESULT AlterGroupMembership(BOOL fRemove, BOOL fIsRollback)
     }
 
 
-    hr = GetDomainFromServerName(&pwzServerName, pwzParentDomain, DS_WRITABLE_REQUIRED);
+    hr = GetDomainServerName(pwzParentDomain, &pwzServerName, DS_WRITABLE_REQUIRED);
     ExitOnFailure(hr, "failed to obtain writable server for domain %ls", pwzParentDomain);
 
     if (*pwzChildDomain)
diff --git a/src/ext/Util/ca/scagroup.cpp b/src/ext/Util/ca/scagroup.cpp
index bab438ea..666100b0 100644
--- a/src/ext/Util/ca/scagroup.cpp
+++ b/src/ext/Util/ca/scagroup.cpp
@@ -1,7 +1,6 @@
 // Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
 
 #include "precomp.h"
-#include "scanet.h"
 
 LPCWSTR vcsGroupQuery = L"SELECT `Group`, `Component_`, `Name`, `Domain` FROM `Wix4Group` WHERE `Group`=?";
 enum eGroupQuery { vgqGroup = 1, vgqComponent, vgqName, vgqDomain };
@@ -458,7 +457,20 @@ HRESULT ScaGroupExecute(
         // and removing groups.  Note: MSDN says that it is safe to call these APIs from any
         // user, so we should be safe calling it during immediate mode.
 
-        hr = GetDomainServerName(psg->wzDomain, &pwzServerName);
+        hr = GetDomainServerName(psg->wzDomain, &pwzServerName, 0);
+        if (HRESULT_FROM_WIN32(ERROR_NO_SUCH_DOMAIN) == hr)
+        {
+            if (SCAG_NON_VITAL & psg->iAttributes)
+            {
+                WcaLog(LOGMSG_VERBOSE, "Domain does not exist for non-vital group: %ls\\%ls - continuing", psg->wzDomain, psg->wzName);
+                hr = S_OK;
+                goto ExitCurrentGroup;
+            }
+            else
+            {
+                ExitOnFailure(hr, "Domain does not exist for vital group: %ls\\%ls - aborting", psg->wzDomain, psg->wzName);
+            }
+        }
 
         er = ::NetLocalGroupGetInfo(pwzServerName, psg->wzName, 0, reinterpret_cast<LPBYTE*>(&pGroupInfo));
         if (NERR_Success == er)
@@ -597,6 +609,7 @@ HRESULT ScaGroupExecute(
             ExitOnFailure(hr, "failed to schedule RemoveGroup");
         }
 
+    ExitCurrentGroup:
         ReleaseNullStr(pwzScriptKey);
         ReleaseNullStr(pwzActionData);
         ReleaseNullStr(pwzRollbackData);
diff --git a/src/ext/Util/ca/scanet.cpp b/src/ext/Util/ca/scanet.cpp
index a8ad0316..ad6c8b01 100644
--- a/src/ext/Util/ca/scanet.cpp
+++ b/src/ext/Util/ca/scanet.cpp
@@ -8,8 +8,13 @@ HRESULT GetDomainServerName(LPCWSTR pwzDomain, LPWSTR* ppwzServerName, ULONG fla
     DWORD er = ERROR_SUCCESS;
     PDOMAIN_CONTROLLER_INFOW pDomainControllerInfo = NULL;
     HRESULT hr = S_OK;
+    WCHAR pwzComputerName[MAX_COMPUTERNAME_LENGTH + 1];
+    DWORD cchComputerName = countof(pwzComputerName);
 
-    if (pwzDomain && *pwzDomain)
+    hr = ::GetComputerNameW(pwzComputerName, &cchComputerName);
+    ExitOnFailure(hr, "failed to obtain computer name");
+
+    if (pwzDomain && *pwzDomain && 0!=lstrcmpiW(pwzComputerName, pwzDomain) && 0!=lstrcmpiW(L".", pwzDomain))
     {
         er = ::DsGetDcNameW(NULL, pwzDomain, NULL, NULL, flags, &pDomainControllerInfo);
         if (RPC_S_SERVER_UNAVAILABLE == er)
@@ -21,7 +26,7 @@ HRESULT GetDomainServerName(LPCWSTR pwzDomain, LPWSTR* ppwzServerName, ULONG fla
         if (ERROR_SUCCESS == er && pDomainControllerInfo->DomainControllerName)
         {
             // Skip the \\ prefix if present.
-            if ('\\' == *pDomainControllerInfo->DomainControllerName && '\\' == *pDomainControllerInfo->DomainControllerName + 1)
+            if ('\\' == *pDomainControllerInfo->DomainControllerName && '\\' == *(pDomainControllerInfo->DomainControllerName + 1) )
             {
                 hr = StrAllocString(ppwzServerName, pDomainControllerInfo->DomainControllerName + 2, 0);
             }
diff --git a/src/ext/Util/ca/scanet.h b/src/ext/Util/ca/scanet.h
index 1fee61f8..efe6a408 100644
--- a/src/ext/Util/ca/scanet.h
+++ b/src/ext/Util/ca/scanet.h
@@ -1,4 +1,16 @@
 #pragma once
 // Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
 
-HRESULT GetDomainServerName(LPCWSTR pwzDomain, LPWSTR* ppwzServerName, ULONG flags = 0);
+
+/**
+ * Locates a domain controller (server name) for a given input domain.
+ * Flags can be provided where required (as per those for DsGetDcName) for a specific server to be returned.
+ * NOTE: Where the domain provided is identical to the local machine, this function will return NULL, such that the
+ * result can be provided directly to NetUserAdd or similar functions.
+ *
+ * @param pwzDomain Pointer to the domain name to be queried
+ * @param ppwzServerName Pointer to the server name to be returned
+ * @param flags Flags to be used in the DsGetDcName call(s)
+ * @return HRESULT to indicate if an error was encountered
+ */
+HRESULT GetDomainServerName(LPCWSTR pwzDomain, LPWSTR* ppwzServerName, ULONG flags);