1 /*
2 * Copyright (C) 2011 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 #include <cutils/sockets.h>
18
19 #include <sys/uio.h>
20
21 #include <log/log.h>
22
23 #if defined(__ANDROID__)
24 /* For the socket trust (credentials) check */
25 #include <private/android_filesystem_config.h>
26 #define __android_unused
27 #else
28 #define __android_unused __attribute__((__unused__))
29 #endif
30
socket_peer_is_trusted(int fd __android_unused)31 bool socket_peer_is_trusted(int fd __android_unused) {
32 #if defined(__ANDROID__)
33 ucred cr;
34 socklen_t len = sizeof(cr);
35 int n = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &len);
36
37 if (n != 0) {
38 ALOGE("could not get socket credentials: %s\n", strerror(errno));
39 return false;
40 }
41
42 if ((cr.uid != AID_ROOT) && (cr.uid != AID_SHELL)) {
43 ALOGE("untrusted userid on other end of socket: userid %d\n", cr.uid);
44 return false;
45 }
46 #endif
47
48 return true;
49 }
50
socket_close(int sock)51 int socket_close(int sock) {
52 return close(sock);
53 }
54
socket_set_receive_timeout(cutils_socket_t sock,int timeout_ms)55 int socket_set_receive_timeout(cutils_socket_t sock, int timeout_ms) {
56 timeval tv;
57 tv.tv_sec = timeout_ms / 1000;
58 tv.tv_usec = (timeout_ms % 1000) * 1000;
59 return setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
60 }
61
socket_send_buffers(cutils_socket_t sock,const cutils_socket_buffer_t * buffers,size_t num_buffers)62 ssize_t socket_send_buffers(cutils_socket_t sock,
63 const cutils_socket_buffer_t* buffers,
64 size_t num_buffers) {
65 if (num_buffers > SOCKET_SEND_BUFFERS_MAX_BUFFERS) {
66 return -1;
67 }
68
69 iovec iovec_buffers[SOCKET_SEND_BUFFERS_MAX_BUFFERS];
70 for (size_t i = 0; i < num_buffers; ++i) {
71 // It's safe to cast away const here; iovec declares non-const
72 // void* because it's used for both send and receive, but since
73 // we're only sending, the data won't be modified.
74 iovec_buffers[i].iov_base = const_cast<void*>(buffers[i].data);
75 iovec_buffers[i].iov_len = buffers[i].length;
76 }
77
78 return writev(sock, iovec_buffers, num_buffers);
79 }
80