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/*
* 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);
}
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