libcutils: share Windows networking code.
This CL moves Windows networking code from fastboot to libcutils so
that it can be shared with other host programs such as adb.
Not all libcutils networking functions have been implemented for
Windows, just those necessary for fastboot. In the next CL I will do
the same for adb, adding any additional required functions.
Unit tests have also been added to test the functions using a loopback
connection.
Bug: http://b/26236380.
Change-Id: Ibc51a67030fe69a04c23512eefa9d19b055c7c12
diff --git a/libcutils/sockets_unix.c b/libcutils/sockets_unix.c
new file mode 100644
index 0000000..ca3f67e
--- /dev/null
+++ b/libcutils/sockets_unix.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <cutils/sockets.h>
+#include <log/log.h>
+
+#if defined(__ANDROID__)
+/* For the socket trust (credentials) check */
+#include <private/android_filesystem_config.h>
+#define __android_unused
+#else
+#define __android_unused __attribute__((__unused__))
+#endif
+
+bool socket_peer_is_trusted(int fd __android_unused)
+{
+#if defined(__ANDROID__)
+ struct ucred cr;
+ socklen_t len = sizeof(cr);
+ int n = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &len);
+
+ if (n != 0) {
+ ALOGE("could not get socket credentials: %s\n", strerror(errno));
+ return false;
+ }
+
+ if ((cr.uid != AID_ROOT) && (cr.uid != AID_SHELL)) {
+ ALOGE("untrusted userid on other end of socket: userid %d\n", cr.uid);
+ return false;
+ }
+#endif
+
+ return true;
+}
+
+int socket_close(int sock) {
+ return close(sock);
+}
