97 lines
2.6 KiB
C++
97 lines
2.6 KiB
C++
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/*
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* Copyright 2016, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "debuggerd/util.h"
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#include <sys/socket.h>
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#include <utility>
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#include <android-base/unique_fd.h>
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#include <cutils/sockets.h>
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ssize_t send_fd(int sockfd, const void* data, size_t len, android::base::unique_fd fd) {
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char cmsg_buf[CMSG_SPACE(sizeof(int))];
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iovec iov = { .iov_base = const_cast<void*>(data), .iov_len = len };
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msghdr msg = {
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.msg_iov = &iov, .msg_iovlen = 1, .msg_control = cmsg_buf, .msg_controllen = sizeof(cmsg_buf),
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};
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auto cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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*reinterpret_cast<int*>(CMSG_DATA(cmsg)) = fd.get();
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return TEMP_FAILURE_RETRY(sendmsg(sockfd, &msg, 0));
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}
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ssize_t recv_fd(int sockfd, void* _Nonnull data, size_t len,
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android::base::unique_fd* _Nullable out_fd) {
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char cmsg_buf[CMSG_SPACE(sizeof(int))];
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iovec iov = { .iov_base = const_cast<void*>(data), .iov_len = len };
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msghdr msg = {
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.msg_iov = &iov,
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.msg_iovlen = 1,
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.msg_control = cmsg_buf,
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.msg_controllen = sizeof(cmsg_buf),
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.msg_flags = 0,
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};
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auto cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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ssize_t result = TEMP_FAILURE_RETRY(recvmsg(sockfd, &msg, 0));
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if (result == -1) {
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return -1;
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}
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android::base::unique_fd fd;
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bool received_fd = msg.msg_controllen == sizeof(cmsg_buf);
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if (received_fd) {
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fd.reset(*reinterpret_cast<int*>(CMSG_DATA(cmsg)));
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}
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if ((msg.msg_flags & MSG_TRUNC) != 0) {
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errno = EFBIG;
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return -1;
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} else if ((msg.msg_flags & MSG_CTRUNC) != 0) {
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errno = ERANGE;
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return -1;
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}
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if (out_fd) {
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*out_fd = std::move(fd);
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} else if (received_fd) {
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errno = ERANGE;
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return -1;
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}
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return result;
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}
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bool Pipe(android::base::unique_fd* read, android::base::unique_fd* write) {
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int pipefds[2];
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if (pipe(pipefds) != 0) {
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return false;
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}
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read->reset(pipefds[0]);
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write->reset(pipefds[1]);
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return true;
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}
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