1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17
18#include <android/multinetwork.h>
19#include <errno.h>
20#include <NetdClient.h>    // the functions that communicate with netd
21#include <resolv_netid.h>  // android_getaddrinfofornet()
22#include <stdlib.h>
23#include <sys/limits.h>
24
25
26static int getnetidfromhandle(net_handle_t handle, unsigned *netid) {
27    static const uint32_t k32BitMask = 0xffffffff;
28    // This value MUST be kept in sync with the corresponding value in
29    // the android.net.Network#getNetworkHandle() implementation.
30    static const uint32_t kHandleMagic = 0xfacade;
31
32    // Check for minimum acceptable version of the API in the low bits.
33    if (handle != NETWORK_UNSPECIFIED &&
34        (handle & k32BitMask) != kHandleMagic) {
35        return 0;
36    }
37
38    if (netid != NULL) {
39        *netid = ((handle >> (CHAR_BIT * sizeof(k32BitMask))) & k32BitMask);
40    }
41    return 1;
42}
43
44
45int android_setsocknetwork(net_handle_t network, int fd) {
46    unsigned netid;
47    if (!getnetidfromhandle(network, &netid)) {
48        errno = EINVAL;
49        return -1;
50    }
51
52    int rval = setNetworkForSocket(netid, fd);
53    if (rval < 0) {
54        errno = -rval;
55        rval = -1;
56    }
57    return rval;
58}
59
60int android_setprocnetwork(net_handle_t network) {
61    unsigned netid;
62    if (!getnetidfromhandle(network, &netid)) {
63        errno = EINVAL;
64        return -1;
65    }
66
67    int rval = setNetworkForProcess(netid);
68    if (rval < 0) {
69        errno = -rval;
70        rval = -1;
71    }
72    return rval;
73}
74
75int android_getaddrinfofornetwork(net_handle_t network,
76        const char *node, const char *service,
77        const struct addrinfo *hints, struct addrinfo **res) {
78    unsigned netid;
79    if (!getnetidfromhandle(network, &netid)) {
80        errno = EINVAL;
81        return EAI_SYSTEM;
82    }
83
84    return android_getaddrinfofornet(node, service, hints, netid, 0, res);
85}
86