1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/*
* 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>
// This value MUST be kept in sync with the corresponding value in
// the android.net.Network#getNetworkHandle() implementation.
static const uint32_t kHandleMagic = 0xcafed00d;
static const uint32_t kHandleMagicSize = 32;
static int getnetidfromhandle(net_handle_t handle, unsigned *netid) {
static const uint32_t k32BitMask = 0xffffffff;
// 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;
}
static net_handle_t gethandlefromnetid(unsigned netid) {
if (netid == NETID_UNSET) {
return NETWORK_UNSPECIFIED;
}
return (((net_handle_t) netid) << kHandleMagicSize) | kHandleMagic;
}
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_getprocnetwork(net_handle_t *network) {
if (network == NULL) {
errno = EINVAL;
return -1;
}
unsigned netid = getNetworkForProcess();
*network = gethandlefromnetid(netid);
return 0;
}
int android_setprocdns(net_handle_t network) {
unsigned netid;
if (!getnetidfromhandle(network, &netid)) {
errno = EINVAL;
return -1;
}
int rval = setNetworkForResolv(netid);
if (rval < 0) {
errno = -rval;
rval = -1;
}
return rval;
}
int android_getprocdns(net_handle_t *network) {
if (network == NULL) {
errno = EINVAL;
return -1;
}
unsigned netid;
int rval = getNetworkForDns(&netid);
if (rval < 0) {
errno = -rval;
return -1;
}
*network = gethandlefromnetid(netid);
return 0;
}
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);
}
int android_res_nquery(net_handle_t network, const char *dname,
int ns_class, int ns_type, enum ResNsendFlags flags) {
unsigned netid;
if (!getnetidfromhandle(network, &netid)) {
return -ENONET;
}
return resNetworkQuery(netid, dname, ns_class, ns_type, flags);
}
int android_res_nresult(int fd, int *rcode, uint8_t *answer, size_t anslen) {
return resNetworkResult(fd, rcode, answer, anslen);
}
int android_res_nsend(net_handle_t network, const uint8_t *msg, size_t msglen,
enum ResNsendFlags flags) {
unsigned netid;
if (!getnetidfromhandle(network, &netid)) {
return -ENONET;
}
return resNetworkSend(netid, msg, msglen, flags);
}
void android_res_cancel(int nsend_fd) {
resNetworkCancel(nsend_fd);
}
int android_tag_socket_with_uid(int sockfd, uint32_t tag, uid_t uid) {
return tagSocket(sockfd, tag, uid);
}
int android_tag_socket(int sockfd, uint32_t tag) {
return tagSocket(sockfd, tag, -1);
}
int android_untag_socket(int sockfd) {
return untagSocket(sockfd);
}
|
