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