iphlpapi: Set DNS servers in the IP_PER_ADAPTER_INFO returned for non-loopback addresses.

dlls/iphlpapi/ifenum.c

@@ -158,6 +158,21 @@ DWORD getInterfaceIndexByName(const char *name, PDWORD index)
   return ret;
 }
 
+BOOL isIfIndexLoopback(ULONG idx)
+{
+  BOOL ret = FALSE;
+  char name[IFNAMSIZ];
+  int fd;
+
+  getInterfaceNameByIndex(idx, name);
+  fd = socket(PF_INET, SOCK_DGRAM, 0);
+  if (fd != -1) {
+    ret = isLoopbackInterface(fd, name);
+    close(fd);
+  }
+  return ret;
+}
+
 DWORD getNumNonLoopbackInterfaces(void)
 {
   DWORD numInterfaces;

dlls/iphlpapi/ifenum.h

@@ -46,6 +46,7 @@
 
 DWORD getNumInterfaces(void);
 DWORD getNumNonLoopbackInterfaces(void);
+BOOL isIfIndexLoopback(ULONG idx);
 
 /* A table of interface indexes, see get*InterfaceTable(). */
 typedef struct _InterfaceIndexTable {

dlls/iphlpapi/iphlpapi_main.c

@@ -1688,18 +1688,21 @@ DWORD WINAPI GetNumberOfInterfaces(PDWORD pdwNumIf)
  * RETURNS
  *  Success: NO_ERROR
  *  Failure: error code from winerror.h
- *
- * FIXME
- *  Stub, returns empty IP_PER_ADAPTER_INFO in every case.
  */
 DWORD WINAPI GetPerAdapterInfo(ULONG IfIndex, PIP_PER_ADAPTER_INFO pPerAdapterInfo, PULONG pOutBufLen)
 {
-  ULONG bytesNeeded = sizeof(IP_PER_ADAPTER_INFO);
+  ULONG bytesNeeded = sizeof(IP_PER_ADAPTER_INFO), serverListSize = 0;
+  DWORD ret = NO_ERROR;
 
   TRACE("(IfIndex %d, pPerAdapterInfo %p, pOutBufLen %p)\n", IfIndex, pPerAdapterInfo, pOutBufLen);
 
   if (!pOutBufLen) return ERROR_INVALID_PARAMETER;
 
+  if (!isIfIndexLoopback(IfIndex)) {
+    get_dns_server_list(NULL, NULL, &serverListSize);
+    if (serverListSize > sizeof(IP_ADDR_STRING))
+      bytesNeeded += serverListSize - sizeof(IP_ADDR_STRING);
+  }
   if (!pPerAdapterInfo || *pOutBufLen < bytesNeeded)
   {
     *pOutBufLen = bytesNeeded;
@@ -1707,7 +1710,14 @@ DWORD WINAPI GetPerAdapterInfo(ULONG IfIndex, PIP_PER_ADAPTER_INFO pPerAdapterIn
   }
 
   memset(pPerAdapterInfo, 0, bytesNeeded);
-  return NO_ERROR;
+  if (!isIfIndexLoopback(IfIndex)) {
+    ret = get_dns_server_list(&pPerAdapterInfo->DnsServerList,
+     (PIP_ADDR_STRING)((PBYTE)pPerAdapterInfo + sizeof(IP_PER_ADAPTER_INFO)),
+     &serverListSize);
+    /* Assume the first DNS server in the list is the "current" DNS server: */
+    pPerAdapterInfo->CurrentDnsServer = &pPerAdapterInfo->DnsServerList;
+  }
+  return ret;
 }