90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
|
/*
|
||
|
|
* Copyright (C) 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 <errno.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#include "LeakPipe.h"
|
||
|
|
|
||
|
|
#include "log.h"
|
||
|
|
|
||
|
|
bool LeakPipe::SendFd(int sock, int fd) {
|
||
|
|
struct msghdr hdr{};
|
||
|
|
struct iovec iov{};
|
||
|
|
unsigned int data = 0xfdfdfdfd;
|
||
|
|
alignas(struct cmsghdr) char cmsgbuf[CMSG_SPACE(sizeof(int))];
|
||
|
|
|
||
|
|
hdr.msg_iov = &iov;
|
||
|
|
hdr.msg_iovlen = 1;
|
||
|
|
iov.iov_base = &data;
|
||
|
|
iov.iov_len = sizeof(data);
|
||
|
|
|
||
|
|
hdr.msg_control = cmsgbuf;
|
||
|
|
hdr.msg_controllen = CMSG_LEN(sizeof(int));
|
||
|
|
|
||
|
|
struct cmsghdr* cmsg = CMSG_FIRSTHDR(&hdr);
|
||
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
|
||
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
||
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
||
|
|
|
||
|
|
*(int*)CMSG_DATA(cmsg) = fd;
|
||
|
|
|
||
|
|
int ret = sendmsg(sock, &hdr, 0);
|
||
|
|
if (ret < 0) {
|
||
|
|
ALOGE("failed to send fd: %s", strerror(errno));
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
if (ret == 0) {
|
||
|
|
ALOGE("eof when sending fd");
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
int LeakPipe::ReceiveFd(int sock) {
|
||
|
|
struct msghdr hdr{};
|
||
|
|
struct iovec iov{};
|
||
|
|
unsigned int data;
|
||
|
|
alignas(struct cmsghdr) char cmsgbuf[CMSG_SPACE(sizeof(int))];
|
||
|
|
|
||
|
|
hdr.msg_iov = &iov;
|
||
|
|
hdr.msg_iovlen = 1;
|
||
|
|
iov.iov_base = &data;
|
||
|
|
iov.iov_len = sizeof(data);
|
||
|
|
|
||
|
|
hdr.msg_control = cmsgbuf;
|
||
|
|
hdr.msg_controllen = CMSG_LEN(sizeof(int));
|
||
|
|
|
||
|
|
int ret = recvmsg(sock, &hdr, 0);
|
||
|
|
if (ret < 0) {
|
||
|
|
ALOGE("failed to receive fd: %s", strerror(errno));
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
if (ret == 0) {
|
||
|
|
ALOGE("eof when receiving fd");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct cmsghdr* cmsg = CMSG_FIRSTHDR(&hdr);
|
||
|
|
if (cmsg == NULL || cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
|
||
|
|
ALOGE("missing fd while receiving fd");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return *(int*)CMSG_DATA(cmsg);
|
||
|
|
}
|