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 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 51 int socket_close(int sock) { 52 return close(sock); 53 } 54 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 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
