bpo-37007: Implement socket.if_nametoindex(), if_indextoname() and if_nameindex() on Windows (GH-13522)

1 files changed, 49 insertions, 11 deletions

diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index ca4d760..ac1698c 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -345,6 +345,8 @@ http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/net/getaddrinfo.c.diff?r1=1.82&
 
 /* Provides the IsWindows7SP1OrGreater() function */
 #include <versionhelpers.h>
+// For if_nametoindex() and if_indextoname()
+#include <iphlpapi.h>
 
 /* remove some flags on older version Windows during run-time.
    https://msdn.microsoft.com/en-us/library/windows/desktop/ms738596.aspx */
@@ -6667,28 +6669,56 @@ Set the default timeout in seconds (float) for new socket objects.\n\
 A value of None indicates that new socket objects have no timeout.\n\
 When the socket module is first imported, the default is None.");
 
-#ifdef HAVE_IF_NAMEINDEX
+#if defined(HAVE_IF_NAMEINDEX) || defined(MS_WINDOWS)
 /* Python API for getting interface indices and names */
 
 static PyObject *
 socket_if_nameindex(PyObject *self, PyObject *arg)
 {
-    PyObject *list;
+    PyObject *list = PyList_New(0);
+    if (list == NULL) {
+        return NULL;
+    }
+#ifdef MS_WINDOWS
+    PMIB_IF_TABLE2 tbl;
+    int ret;
+    if ((ret = GetIfTable2Ex(MibIfTableRaw, &tbl)) != NO_ERROR) {
+        Py_DECREF(list);
+        // ret is used instead of GetLastError()
+        return PyErr_SetFromWindowsErr(ret);
+    }
+    for (ULONG i = 0; i < tbl->NumEntries; ++i) {
+        MIB_IF_ROW2 r = tbl->Table[i];
+        WCHAR buf[NDIS_IF_MAX_STRING_SIZE + 1];
+        if ((ret = ConvertInterfaceLuidToNameW(&r.InterfaceLuid, buf,
+                                               Py_ARRAY_LENGTH(buf)))) {
+            Py_DECREF(list);
+            FreeMibTable(tbl);
+            // ret is used instead of GetLastError()
+            return PyErr_SetFromWindowsErr(ret);
+        }
+        PyObject *tuple = Py_BuildValue("Iu", r.InterfaceIndex, buf);
+        if (tuple == NULL || PyList_Append(list, tuple) == -1) {
+            Py_XDECREF(tuple);
+            Py_DECREF(list);
+            FreeMibTable(tbl);
+            return NULL;
+        }
+        Py_DECREF(tuple);
+    }
+    FreeMibTable(tbl);
+    return list;
+#else
     int i;
     struct if_nameindex *ni;
 
     ni = if_nameindex();
     if (ni == NULL) {
+        Py_DECREF(list);
         PyErr_SetFromErrno(PyExc_OSError);
         return NULL;
     }
 
-    list = PyList_New(0);
-    if (list == NULL) {
-        if_freenameindex(ni);
-        return NULL;
-    }
-
 #ifdef _Py_MEMORY_SANITIZER
     __msan_unpoison(ni, sizeof(ni));
     __msan_unpoison(&ni[0], sizeof(ni[0]));
@@ -6720,6 +6750,7 @@ socket_if_nameindex(PyObject *self, PyObject *arg)
 
     if_freenameindex(ni);
     return list;
+#endif
 }
 
 PyDoc_STRVAR(if_nameindex_doc,
@@ -6731,8 +6762,11 @@ static PyObject *
 socket_if_nametoindex(PyObject *self, PyObject *args)
 {
     PyObject *oname;
+#ifdef MS_WINDOWS
+    NET_IFINDEX index;
+#else
     unsigned long index;
-
+#endif
     if (!PyArg_ParseTuple(args, "O&:if_nametoindex",
                           PyUnicode_FSConverter, &oname))
         return NULL;
@@ -6756,7 +6790,11 @@ Returns the interface index corresponding to the interface name if_name.");
 static PyObject *
 socket_if_indextoname(PyObject *self, PyObject *arg)
 {
+#ifdef MS_WINDOWS
+    NET_IFINDEX index;
+#else
     unsigned long index;
+#endif
     char name[IF_NAMESIZE + 1];
 
     index = PyLong_AsUnsignedLong(arg);
@@ -6776,7 +6814,7 @@ PyDoc_STRVAR(if_indextoname_doc,
 \n\
 Returns the interface name corresponding to the interface index if_index.");
 
-#endif  /* HAVE_IF_NAMEINDEX */
+#endif // defined(HAVE_IF_NAMEINDEX) || defined(MS_WINDOWS)
 
 
 #ifdef CMSG_LEN
@@ -6898,7 +6936,7 @@ static PyMethodDef socket_methods[] = {
      METH_NOARGS, getdefaulttimeout_doc},
     {"setdefaulttimeout",       socket_setdefaulttimeout,
      METH_O, setdefaulttimeout_doc},
-#ifdef HAVE_IF_NAMEINDEX
+#if defined(HAVE_IF_NAMEINDEX) || defined(MS_WINDOWS)
     {"if_nameindex", socket_if_nameindex,
      METH_NOARGS, if_nameindex_doc},
     {"if_nametoindex", socket_if_nametoindex,