[cgutman] 59633: [IP] - Do a better job of selecting an interface to use when none was specified - Fix build

Author: cgutman
Date: Sun Aug  4 12:45:53 2013
New Revision: 59633

URL: http://svn.reactos.org/svn/reactos?rev=59633&view=rev
Log:
[IP]
- Do a better job of selecting an interface to use when none was specified
- Fix build

Modified:
    trunk/reactos/lib/drivers/ip/network/interface.c

Modified: trunk/reactos/lib/drivers/ip/network/interface.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/lib/drivers/ip/network/int…
==============================================================================
--- trunk/reactos/lib/drivers/ip/network/interface.c	[iso-8859-1] (original)
+++ trunk/reactos/lib/drivers/ip/network/interface.c	[iso-8859-1] Sun Aug  4 12:45:53
2013
@@ -10,6 +10,8 @@
  */
 
 #include "precomp.h"
+
+ULONG NextDefaultAdapter = 0;
 
 NTSTATUS GetInterfaceIPv4Address( PIP_INTERFACE Interface,
 				  ULONG TargetType,
@@ -143,18 +145,46 @@
     return TRUE;
 }
 
-static PIP_INTERFACE GetDefaultInterface(VOID)
+PIP_INTERFACE GetDefaultInterface(VOID)
 {
    KIRQL OldIrql;
+   ULONG Index = 0;
+   
    IF_LIST_ITER(CurrentIF);
 
    TcpipAcquireSpinLock(&InterfaceListLock, &OldIrql);
+   /* DHCP hack: Always return the adapter without an IP address */
    ForEachInterface(CurrentIF) {
       if (CurrentIF->Context) {
+          if (AddrIsUnspecified(&CurrentIF->Unicast)) {
+              TcpipReleaseSpinLock(&InterfaceListLock, OldIrql);
+              return CurrentIF;
+          }
+      }
+   } EndFor(CurrentIF);   
+   
+   /* Try to continue from the next adapter */
+   ForEachInterface(CurrentIF) {
+      if (CurrentIF->Context) {
+          if (Index++ == NextDefaultAdapter) {
+              NextDefaultAdapter++;
+              TcpipReleaseSpinLock(&InterfaceListLock, OldIrql);
+              return CurrentIF;
+          }
+      }
+   } EndFor(CurrentIF);
+   
+   /* No luck, so we'll choose the first adapter this time */
+   ForEachInterface(CurrentIF) {
+      if (CurrentIF->Context) {
+          NextDefaultAdapter = 1;
           TcpipReleaseSpinLock(&InterfaceListLock, OldIrql);
           return CurrentIF;
       }
    } EndFor(CurrentIF);
+   
+   /* Even that didn't work, so we'll just go with loopback */
+   NextDefaultAdapter = 0;
    TcpipReleaseSpinLock(&InterfaceListLock, OldIrql);
 
    /* There are no physical interfaces on the system