iphlpapi: Set 0.0.0.0 as the IP and mask of disconnected interfaces

[Bruno Jesus]

Superseeds 108610.

In Windows if the eth cable is disconnected the interface returns
0.0.0.0, when it's connected and using DHCP but no DHCP server is
found it returns an APIPA [1] address. In our case it's simpler to
assume that an IP less interface is a disconnected interface.

Fixes bug https://bugs.winehq.org/show_bug.cgi?id=32205

[1] http://www.webopedia.com/TERM/A/APIPA.html
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diff --git a/dlls/iphlpapi/iphlpapi_main.c b/dlls/iphlpapi/iphlpapi_main.c
index 59f3593..d2f36fe 100644
--- a/dlls/iphlpapi/iphlpapi_main.c
+++ b/dlls/iphlpapi/iphlpapi_main.c
@@ -604,6 +604,12 @@ DWORD WINAPI GetAdaptersInfo(PIP_ADAPTER_INFO pAdapterInfo, PULONG pOutBufLen)
                   }
                 }
               }
+              /* If no IP was found it probably means that the interface is not
+               * configured. In this case we have to return a zeroed IP and mask. */
+              if (firstIPAddr) {
+                strcpy(ptr->IpAddressList.IpAddress.String, "0.0.0.0");
+                strcpy(ptr->IpAddressList.IpMask.String, "0.0.0.0");
+              }
               /* Find first router through this interface, which we'll assume
                * is the default gateway for this adapter */
               for (i = 0; i < routeTable->dwNumEntries; i++)
diff --git a/dlls/iphlpapi/tests/iphlpapi.c b/dlls/iphlpapi/tests/iphlpapi.c
index b2d81c0..14bbc5d 100644
--- a/dlls/iphlpapi/tests/iphlpapi.c
+++ b/dlls/iphlpapi/tests/iphlpapi.c
@@ -1118,12 +1118,20 @@ static void testGetAdaptersInfo(void)
     if (apiReturn == ERROR_NO_DATA)
       ; /* no adapter's, that's okay */
     else if (apiReturn == ERROR_BUFFER_OVERFLOW) {
-      PIP_ADAPTER_INFO buf = HeapAlloc(GetProcessHeap(), 0, len);
+      PIP_ADAPTER_INFO ptr, buf = HeapAlloc(GetProcessHeap(), 0, len);
 
       apiReturn = pGetAdaptersInfo(buf, &len);
       ok(apiReturn == NO_ERROR,
        "GetAdaptersInfo(buf, &dwSize) returned %d, expected NO_ERROR\n",
        apiReturn);
+      ptr = buf;
+      while (ptr) {
+        ok(ptr->IpAddressList.IpAddress.String[0], "A valid IP must be present\n");
+        ok(ptr->IpAddressList.IpMask.String[0], "A valid mask must be present\n");
+        trace("Adapter '%s', IP %s, Mask %s\n", ptr->AdapterName,
+              ptr->IpAddressList.IpAddress.String, ptr->IpAddressList.IpMask.String);
+        ptr = ptr->Next;
+      }
       HeapFree(GetProcessHeap(), 0, buf);
     }
   }