| /* |
| * Copyright (C) 2008 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 <sys/types.h> |
| #include <sys/socket.h> |
| #include <linux/netlink.h> |
| #include <string.h> |
| |
| #define LOG_TAG "NetlinkListener" |
| #include <cutils/log.h> |
| |
| #include <sysutils/NetlinkListener.h> |
| #include <sysutils/NetlinkEvent.h> |
| |
| NetlinkListener::NetlinkListener(int socket) : |
| SocketListener(socket, false) { |
| } |
| |
| bool NetlinkListener::onDataAvailable(SocketClient *cli) |
| { |
| int socket = cli->getSocket(); |
| ssize_t count; |
| char cred_msg[CMSG_SPACE(sizeof(struct ucred))]; |
| struct sockaddr_nl snl; |
| struct iovec iov = {mBuffer, sizeof(mBuffer)}; |
| struct msghdr hdr = {&snl, sizeof(snl), &iov, 1, cred_msg, sizeof(cred_msg), 0}; |
| |
| count = TEMP_FAILURE_RETRY(recvmsg(socket, &hdr, 0)); |
| if (count < 0) { |
| SLOGE("recvmsg failed (%s)", strerror(errno)); |
| return false; |
| } |
| |
| if ((snl.nl_groups != 1) || (snl.nl_pid != 0)) { |
| SLOGE("ignoring non-kernel netlink multicast message"); |
| return false; |
| } |
| |
| struct cmsghdr * cmsg = CMSG_FIRSTHDR(&hdr); |
| |
| if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) { |
| SLOGE("ignoring message with no sender credentials"); |
| return false; |
| } |
| |
| struct ucred * cred = (struct ucred *)CMSG_DATA(cmsg); |
| if (cred->uid != 0) { |
| SLOGE("ignoring message from non-root UID %d", cred->uid); |
| return false; |
| } |
| |
| NetlinkEvent *evt = new NetlinkEvent(); |
| if (!evt->decode(mBuffer, count)) { |
| SLOGE("Error decoding NetlinkEvent"); |
| goto out; |
| } |
| |
| onEvent(evt); |
| out: |
| delete evt; |
| return true; |
| } |