diff options
Diffstat (limited to 'mobicore/MobiCoreDriverLib/Daemon/Server/NetlinkServer.cpp')
| -rw-r--r-- | mobicore/MobiCoreDriverLib/Daemon/Server/NetlinkServer.cpp | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/mobicore/MobiCoreDriverLib/Daemon/Server/NetlinkServer.cpp b/mobicore/MobiCoreDriverLib/Daemon/Server/NetlinkServer.cpp new file mode 100644 index 0000000..0e88cce --- /dev/null +++ b/mobicore/MobiCoreDriverLib/Daemon/Server/NetlinkServer.cpp @@ -0,0 +1,283 @@ +/* + * Copyright (c) 2013 TRUSTONIC LIMITED + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the TRUSTONIC LIMITED nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR + * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF + * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +/** + * Connection server. + * + * Handles incoming socket connections from clients using the MobiCore driver. + */ +#include "public/NetlinkServer.h" +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <linux/netlink.h> + +#include <stdlib.h> +#include "NetlinkConnection.h" +#include <signal.h> + +#define LOG_TAG "McDaemon" +#include "log.h" + +//------------------------------------------------------------------------------ +NetlinkServer::NetlinkServer( + ConnectionHandler *connectionHandler +): Server(connectionHandler, "dummy") +{ +} + + +//------------------------------------------------------------------------------ +void NetlinkServer::run( +) +{ + do { + LOG_I("NetlinkServer: Starting to listen on netlink bus"); + + // Open a socket + serverSock = socket(PF_NETLINK, SOCK_DGRAM, MC_DAEMON_NETLINK); + if (serverSock < 0) { + LOG_ERRNO("Opening socket"); + break; + } + + // Fill in address structure and bind to socket + struct sockaddr_nl src_addr; + struct nlmsghdr *nlh = NULL; + struct iovec iov; + struct msghdr msg; + uint32_t len; + + memset(&src_addr, 0, sizeof(src_addr)); + src_addr.nl_family = AF_NETLINK; + src_addr.nl_pid = MC_DAEMON_PID; /* daemon pid */ + src_addr.nl_groups = 0; /* not in mcast groups */ + if (bind(serverSock, (struct sockaddr *)&src_addr, sizeof(src_addr)) < 0) { + LOG_ERRNO("Binding to server socket failed, because bind"); + close(serverSock); + serverSock = -1; + break; + } + + // Start reading the socket + LOG_I("\n********* successfully initialized *********\n"); + + for (;;) { + // This buffer will be taken over by the connection it was routed to + nlh = (struct nlmsghdr *)malloc(NLMSG_SPACE(MAX_PAYLOAD)); + if (nlh == NULL) { + LOG_E("Allocation failure"); + break; + } + memset(&msg, 0, sizeof(msg)); + iov.iov_base = (void *)nlh; + iov.iov_len = NLMSG_SPACE(MAX_PAYLOAD); + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_name = &src_addr; + msg.msg_namelen = sizeof(src_addr); + + memset(nlh, 0, NLMSG_SPACE(MAX_PAYLOAD)); + + // Read the incoming message and route it to the connection based + // on the incoming PID + if ((int) (len = recvmsg(serverSock, &msg, 0)) < 0) { + LOG_ERRNO("recvmsg"); + break; + } + + if (NLMSG_OK(nlh, len)) { + handleMessage(nlh); + } else { + break; + } + } + close(serverSock); + serverSock = -1; + } while (false); + + LOG_W("Could not open netlink socket. KernelAPI disabled"); +} + +//------------------------------------------------------------------------------ +void NetlinkServer::handleMessage( + struct nlmsghdr *nlh +) +{ + uint32_t seq = nlh->nlmsg_seq; + uint32_t pid = nlh->nlmsg_pid; + //LOG_I("%s: Handling NQ message for pid %u seq %u...", __FUNCTION__, pid, seq); + uint64_t hash = hashConnection(pid, seq); + /* First cleanup the connection list */ + cleanupConnections(); + + NetlinkConnection *connection = findConnection(hash); + // This is a message from a new client + if (connection == NULL) { + //LOG_I("%s: Cound't find the connection, creating a new one", __FUNCTION__); + connection = new NetlinkConnection(this, serverSock, pid, seq); + // Add the new connection + insertConnection(hash, connection); + } + + connection->handleMessage(nlh); + + // Only handle connections which have not been detached + if (connection->detached == false) { + if (!connectionHandler->handleConnection(connection)) { + LOG_I("%s: No command processed.", __FUNCTION__); + connection->socketDescriptor = -1; + //Inform the driver + connectionHandler->dropConnection(connection); + + // Remove connection from list + removeConnection(hash); + connection->socketDescriptor = -1; + delete connection; + } + // If connection data is set to NULL then device close has been called + // so we must remove all connections associated with this hash + else if (connection->connectionData == NULL && + connection->detached == false) { + delete connection; + } + } +} + + +//------------------------------------------------------------------------------ +void NetlinkServer::detachConnection( + Connection *connection +) +{ + connection->detached = true; +} + + +//------------------------------------------------------------------------------ +NetlinkServer::~NetlinkServer( + void +) +{ + connectionMap_t::iterator i; + // Shut down the server socket + if(serverSock != -1) { + close(serverSock); + serverSock = -1; + } + + // Destroy all client connections + for (i = peerConnections.begin(); i != peerConnections.end(); i++) { + if (i->second->detached == false) { + delete i->second; + } + } + peerConnections.clear(); +} + + +//------------------------------------------------------------------------------ +NetlinkConnection *NetlinkServer::findConnection( + uint64_t hash +) +{ + connectionMap_t::iterator i = peerConnections.find(hash); + if (i != peerConnections.end()) { + return i->second; + } + + return NULL; +} + + +//------------------------------------------------------------------------------ +void NetlinkServer::insertConnection( + uint64_t hash, + NetlinkConnection *connection +) +{ + peerConnections[hash] = connection; +} + +/* This is called from multiple threads! */ +//------------------------------------------------------------------------------ +void NetlinkServer::removeConnection( + uint64_t hash +) +{ + connectionMap_t::iterator i = peerConnections.find(hash); + if (i != peerConnections.end()) { + peerConnections.erase(i); + } +} + +//------------------------------------------------------------------------------ +void NetlinkServer::cleanupConnections( + void +) +{ + connectionMap_t::reverse_iterator i; + pid_t pid; + NetlinkConnection *connection = NULL; + // Destroy all client connections + for (i = peerConnections.rbegin(); i != peerConnections.rend(); ++i) { + connection = i->second; + // Only 16 bits are for the actual PID, the rest is session magic + pid = connection->peerPid & 0xFFFF; + //LOG_I("%s: checking PID %u", __FUNCTION__, pid); + // Check if the peer pid is still alive + if (pid == 0) { + continue; + } + if (kill(pid, 0)) { + bool detached = connection->detached; + LOG_I("%s: PID %u has died, cleaning up session 0x%X", + __FUNCTION__, pid, connection->peerPid); + + connection->socketDescriptor = -1; + //Inform the driver + connectionHandler->dropConnection(connection); + + // We aren't handling this connection anymore no matter what + removeConnection(connection->hash); + + // Remove connection from list only if detached, the detached + // connections are managed by the device + if (detached == false) { + delete connection; + } + if (peerConnections.size() == 0) { + break; + } + i = peerConnections.rbegin(); + } + } +} + |