fdf832dfd3
Also, switch debuggerd_handler over to using android::base::unique_fd. Test: treehugger Change-Id: I97b2ce22f1795ce1c4370f95d00d769846cc54b8
88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
/*
|
|
* Copyright 2016, 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 "util.h"
|
|
|
|
#include <sys/socket.h>
|
|
|
|
#include <utility>
|
|
|
|
#include <android-base/unique_fd.h>
|
|
#include <cutils/sockets.h>
|
|
#include "protocol.h"
|
|
|
|
using android::base::unique_fd;
|
|
|
|
ssize_t send_fd(int sockfd, const void* data, size_t len, unique_fd fd) {
|
|
char cmsg_buf[CMSG_SPACE(sizeof(int))];
|
|
|
|
iovec iov = { .iov_base = const_cast<void*>(data), .iov_len = len };
|
|
msghdr msg = {
|
|
.msg_iov = &iov, .msg_iovlen = 1, .msg_control = cmsg_buf, .msg_controllen = sizeof(cmsg_buf),
|
|
};
|
|
auto cmsg = CMSG_FIRSTHDR(&msg);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
|
|
*reinterpret_cast<int*>(CMSG_DATA(cmsg)) = fd.get();
|
|
|
|
return TEMP_FAILURE_RETRY(sendmsg(sockfd, &msg, 0));
|
|
}
|
|
|
|
ssize_t recv_fd(int sockfd, void* _Nonnull data, size_t len, unique_fd* _Nullable out_fd) {
|
|
char cmsg_buf[CMSG_SPACE(sizeof(int))];
|
|
|
|
iovec iov = { .iov_base = const_cast<void*>(data), .iov_len = len };
|
|
msghdr msg = {
|
|
.msg_iov = &iov,
|
|
.msg_iovlen = 1,
|
|
.msg_control = cmsg_buf,
|
|
.msg_controllen = sizeof(cmsg_buf),
|
|
.msg_flags = 0,
|
|
};
|
|
auto cmsg = CMSG_FIRSTHDR(&msg);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
|
|
|
|
ssize_t result = TEMP_FAILURE_RETRY(recvmsg(sockfd, &msg, 0));
|
|
if (result == -1) {
|
|
return -1;
|
|
}
|
|
|
|
unique_fd fd;
|
|
bool received_fd = msg.msg_controllen == sizeof(cmsg_buf);
|
|
if (received_fd) {
|
|
fd.reset(*reinterpret_cast<int*>(CMSG_DATA(cmsg)));
|
|
}
|
|
|
|
if ((msg.msg_flags & MSG_TRUNC) != 0) {
|
|
errno = EFBIG;
|
|
return -1;
|
|
} else if ((msg.msg_flags & MSG_CTRUNC) != 0) {
|
|
errno = ERANGE;
|
|
return -1;
|
|
}
|
|
|
|
if (out_fd) {
|
|
*out_fd = std::move(fd);
|
|
} else if (received_fd) {
|
|
errno = ERANGE;
|
|
return -1;
|
|
}
|
|
|
|
return result;
|
|
}
|