multinetwork API: native implementation
Bug: 19537384
Change-Id: I04f4a7de2b1e583989b67a853df6ab50289c2185
diff --git a/native/android/net.c b/native/android/net.c
new file mode 100644
index 0000000..de4b90c
--- /dev/null
+++ b/native/android/net.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2015 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 <android/multinetwork.h>
+#include <errno.h>
+#include <NetdClient.h> // the functions that communicate with netd
+#include <resolv_netid.h> // android_getaddrinfofornet()
+#include <stdlib.h>
+#include <sys/limits.h>
+
+
+static int getnetidfromhandle(net_handle_t handle, unsigned *netid) {
+ static const uint32_t k32BitMask = 0xffffffff;
+ // This value MUST be kept in sync with the corresponding value in
+ // the android.net.Network#getNetworkHandle() implementation.
+ static const uint32_t kHandleMagic = 0xfacade;
+
+ // Check for minimum acceptable version of the API in the low bits.
+ if (handle != NETWORK_UNSPECIFIED &&
+ (handle & k32BitMask) != kHandleMagic) {
+ return 0;
+ }
+
+ if (netid != NULL) {
+ *netid = ((handle >> (CHAR_BIT * sizeof(k32BitMask))) & k32BitMask);
+ }
+ return 1;
+}
+
+
+int android_setsocknetwork(net_handle_t network, int fd) {
+ unsigned netid;
+ if (!getnetidfromhandle(network, &netid)) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ int rval = setNetworkForSocket(netid, fd);
+ if (rval < 0) {
+ errno = -rval;
+ rval = -1;
+ }
+ return rval;
+}
+
+int android_setprocnetwork(net_handle_t network) {
+ unsigned netid;
+ if (!getnetidfromhandle(network, &netid)) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ int rval = setNetworkForProcess(netid);
+ if (rval < 0) {
+ errno = -rval;
+ rval = -1;
+ }
+ return rval;
+}
+
+int android_getaddrinfofornetwork(net_handle_t network,
+ const char *node, const char *service,
+ const struct addrinfo *hints, struct addrinfo **res) {
+ unsigned netid;
+ if (!getnetidfromhandle(network, &netid)) {
+ errno = EINVAL;
+ return EAI_SYSTEM;
+ }
+
+ return android_getaddrinfofornet(node, service, hints, netid, 0, res);
+}