1cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao/* 2cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao * Copyright 2016, The Android Open Source Project 3cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao * 4cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao * Licensed under the Apache License, Version 2.0 (the "License"); 5cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao * you may not use this file except in compliance with the License. 6cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao * You may obtain a copy of the License at 7cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao * 8cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao * http://www.apache.org/licenses/LICENSE-2.0 9cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao * 10cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao * Unless required by applicable law or agreed to in writing, software 11cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao * distributed under the License is distributed on an "AS IS" BASIS, 12cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao * See the License for the specific language governing permissions and 14cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao * limitations under the License. 15cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao */ 16cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 17cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao#include "debuggerd/util.h" 18cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 19cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao#include <sys/socket.h> 20cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 21cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao#include <utility> 22cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 23cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao#include <android-base/unique_fd.h> 24cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao#include <cutils/sockets.h> 25e1aa0ca58a2a356039047ffcc8a98d85d1bce8edJosh Gao#include <debuggerd/protocol.h> 26cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 27e1aa0ca58a2a356039047ffcc8a98d85d1bce8edJosh Gao#include "private/libc_logging.h" 28e1aa0ca58a2a356039047ffcc8a98d85d1bce8edJosh Gao 29e1aa0ca58a2a356039047ffcc8a98d85d1bce8edJosh Gaousing android::base::unique_fd; 30e1aa0ca58a2a356039047ffcc8a98d85d1bce8edJosh Gao 31e1aa0ca58a2a356039047ffcc8a98d85d1bce8edJosh Gaossize_t send_fd(int sockfd, const void* data, size_t len, unique_fd fd) { 32cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao char cmsg_buf[CMSG_SPACE(sizeof(int))]; 33cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 34cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao iovec iov = { .iov_base = const_cast<void*>(data), .iov_len = len }; 35cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao msghdr msg = { 36cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao .msg_iov = &iov, .msg_iovlen = 1, .msg_control = cmsg_buf, .msg_controllen = sizeof(cmsg_buf), 37cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao }; 38cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao auto cmsg = CMSG_FIRSTHDR(&msg); 39cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao cmsg->cmsg_level = SOL_SOCKET; 40cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao cmsg->cmsg_type = SCM_RIGHTS; 41cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao cmsg->cmsg_len = CMSG_LEN(sizeof(int)); 42cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao *reinterpret_cast<int*>(CMSG_DATA(cmsg)) = fd.get(); 43cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 44cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao return TEMP_FAILURE_RETRY(sendmsg(sockfd, &msg, 0)); 45cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao} 46cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 47e1aa0ca58a2a356039047ffcc8a98d85d1bce8edJosh Gaossize_t recv_fd(int sockfd, void* _Nonnull data, size_t len, unique_fd* _Nullable out_fd) { 48cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao char cmsg_buf[CMSG_SPACE(sizeof(int))]; 49cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 50cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao iovec iov = { .iov_base = const_cast<void*>(data), .iov_len = len }; 51cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao msghdr msg = { 52cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao .msg_iov = &iov, 53cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao .msg_iovlen = 1, 54cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao .msg_control = cmsg_buf, 55cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao .msg_controllen = sizeof(cmsg_buf), 56cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao .msg_flags = 0, 57cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao }; 58cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao auto cmsg = CMSG_FIRSTHDR(&msg); 59cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao cmsg->cmsg_level = SOL_SOCKET; 60cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao cmsg->cmsg_type = SCM_RIGHTS; 61cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao cmsg->cmsg_len = CMSG_LEN(sizeof(int)); 62cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 63cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao ssize_t result = TEMP_FAILURE_RETRY(recvmsg(sockfd, &msg, 0)); 64cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao if (result == -1) { 65cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao return -1; 66cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao } 67cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 68e1aa0ca58a2a356039047ffcc8a98d85d1bce8edJosh Gao unique_fd fd; 69cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao bool received_fd = msg.msg_controllen == sizeof(cmsg_buf); 70cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao if (received_fd) { 71cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao fd.reset(*reinterpret_cast<int*>(CMSG_DATA(cmsg))); 72cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao } 73cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 74cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao if ((msg.msg_flags & MSG_TRUNC) != 0) { 75cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao errno = EFBIG; 76cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao return -1; 77cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao } else if ((msg.msg_flags & MSG_CTRUNC) != 0) { 78cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao errno = ERANGE; 79cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao return -1; 80cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao } 81cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 82cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao if (out_fd) { 83cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao *out_fd = std::move(fd); 84cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao } else if (received_fd) { 85cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao errno = ERANGE; 86cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao return -1; 87cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao } 88cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 89cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao return result; 90cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao} 91cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao 92e1aa0ca58a2a356039047ffcc8a98d85d1bce8edJosh Gaobool Pipe(unique_fd* read, unique_fd* write) { 93cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao int pipefds[2]; 94cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao if (pipe(pipefds) != 0) { 95cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao return false; 96cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao } 97cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao read->reset(pipefds[0]); 98cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao write->reset(pipefds[1]); 99cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao return true; 100cbe70cb0a8cb0171f3802273050e851a47b090edJosh Gao} 101