cd387d1e8e
startListeningBlocking is meant to be called under a reader thread, which is the case if startListeningNonBlocking calls it. A LocIpc client may delete the LocIpc obj, which would trigger sending an ABORT msg to the reader thread before it is subsequently deleted, in which case, it is possible that when the reader thread comes around to process the ABORT msg, referencing the data members of the possibly stale obj would cause unpredictable behaviors. Change-Id: I441af85c04d92b6fff695c020e3e0b4bd5e90409 CRs-Fixed: 2380093
227 lines
7.4 KiB
C++
227 lines
7.4 KiB
C++
/* Copyright (c) 2017-2018 The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation, nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <log_util.h>
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#include "LocIpc.h"
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namespace loc_util {
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#ifdef LOG_TAG
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#undef LOG_TAG
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#endif
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#define LOG_TAG "LocSvc_LocIpc"
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#define LOC_MSG_BUF_LEN 8192
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#define LOC_MSG_HEAD "$MSGLEN$"
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#define LOC_MSG_ABORT "LocIpcMsg::ABORT"
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class LocIpcRunnable : public LocRunnable {
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friend LocIpc;
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public:
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LocIpcRunnable(LocIpc& locIpc, const std::string& ipcName)
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: mLocIpc(locIpc), mIpcName(ipcName) {}
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bool run() override {
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if (!mLocIpc.startListeningBlocking(mIpcName)) {
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LOC_LOGe("listen to socket failed");
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}
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return false;
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}
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private:
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LocIpc& mLocIpc;
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const std::string mIpcName;
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};
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bool LocIpc::startListeningNonBlocking(const std::string& name) {
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mRunnable = new LocIpcRunnable(*this, name);
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std::string threadName("LocIpc-");
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threadName.append(name);
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return mThread.start(threadName.c_str(), mRunnable);
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}
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bool LocIpc::startListeningBlocking(const std::string& name) {
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bool stopRequested = false;
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int fd = socket(AF_UNIX, SOCK_DGRAM, 0);
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if (fd < 0) {
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LOC_LOGe("create socket error. reason:%s", strerror(errno));
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return false;
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}
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if ((unlink(name.c_str()) < 0) && (errno != ENOENT)) {
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LOC_LOGw("unlink socket error. reason:%s", strerror(errno));
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}
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struct sockaddr_un addr = { .sun_family = AF_UNIX };
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snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", name.c_str());
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umask(0157);
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if (::bind(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
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LOC_LOGe("bind socket error. reason:%s", strerror(errno));
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} else {
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mIpcFd = fd;
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// inform that the socket is ready to receive message
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onListenerReady();
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ssize_t nBytes = 0;
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std::string msg = "";
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std::string abort = LOC_MSG_ABORT;
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while (1) {
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msg.resize(LOC_MSG_BUF_LEN);
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nBytes = ::recvfrom(fd, (void*)(msg.data()), msg.size(), 0, NULL, NULL);
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if (nBytes < 0) {
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LOC_LOGe("cannot read socket. reason:%s", strerror(errno));
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break;
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} else if (0 == nBytes) {
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continue;
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}
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if (strncmp(msg.data(), abort.c_str(), abort.length()) == 0) {
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LOC_LOGi("recvd abort msg.data %s", msg.data());
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stopRequested = true;
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break;
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}
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if (strncmp(msg.data(), LOC_MSG_HEAD, sizeof(LOC_MSG_HEAD) - 1)) {
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// short message
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msg.resize(nBytes);
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onReceive(msg);
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} else {
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// long message
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size_t msgLen = 0;
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sscanf(msg.data(), LOC_MSG_HEAD"%zu", &msgLen);
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msg.resize(msgLen);
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size_t msgLenReceived = 0;
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while ((msgLenReceived < msgLen) && (nBytes > 0)) {
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nBytes = recvfrom(fd, (void*)&(msg[msgLenReceived]),
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msg.size() - msgLenReceived, 0, NULL, NULL);
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msgLenReceived += nBytes;
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}
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if (nBytes > 0) {
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onReceive(msg);
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} else {
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LOC_LOGe("cannot read socket. reason:%s", strerror(errno));
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break;
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}
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}
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}
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}
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if (::close(fd)) {
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LOC_LOGe("cannot close socket:%s", strerror(errno));
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}
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unlink(name.c_str());
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return stopRequested;
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}
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void LocIpc::stopListening() {
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const char *socketName = nullptr;
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if (mIpcFd >= 0) {
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std::string abort = LOC_MSG_ABORT;
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socketName = (reinterpret_cast<LocIpcRunnable *>(mRunnable))->mIpcName.c_str();
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send(socketName, abort);
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mIpcFd = -1;
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}
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if (mRunnable) {
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mRunnable = nullptr;
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}
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}
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bool LocIpc::send(const char name[], const std::string& data) {
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return send(name, (const uint8_t*)data.c_str(), data.length());
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}
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bool LocIpc::send(const char name[], const uint8_t data[], uint32_t length) {
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bool result = true;
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int fd = ::socket(AF_UNIX, SOCK_DGRAM, 0);
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if (fd < 0) {
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LOC_LOGe("create socket error. reason:%s", strerror(errno));
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return false;
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}
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struct sockaddr_un addr = { .sun_family = AF_UNIX };
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snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", name);
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result = sendData(fd, addr, data, length);
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(void)::close(fd);
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return result;
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}
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bool LocIpc::sendData(int fd, const sockaddr_un &addr, const uint8_t data[], uint32_t length) {
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bool result = true;
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if (length <= LOC_MSG_BUF_LEN) {
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if (::sendto(fd, data, length, 0,
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(struct sockaddr*)&addr, sizeof(addr)) < 0) {
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LOC_LOGe("cannot send to socket:%s. reason:%s",
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addr.sun_path, strerror(errno));
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result = false;
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}
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} else {
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std::string head = LOC_MSG_HEAD;
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head.append(std::to_string(length));
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if (::sendto(fd, head.c_str(), head.length(), 0,
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(struct sockaddr*)&addr, sizeof(addr)) < 0) {
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LOC_LOGe("cannot send to socket:%s. reason:%s",
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addr.sun_path, strerror(errno));
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result = false;
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} else {
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size_t sentBytes = 0;
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while(sentBytes < length) {
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size_t partLen = length - sentBytes;
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if (partLen > LOC_MSG_BUF_LEN) {
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partLen = LOC_MSG_BUF_LEN;
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}
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ssize_t rv = ::sendto(fd, data + sentBytes, partLen, 0,
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(struct sockaddr*)&addr, sizeof(addr));
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if (rv < 0) {
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LOC_LOGe("cannot send to socket:%s. reason:%s",
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addr.sun_path, strerror(errno));
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result = false;
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break;
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}
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sentBytes += rv;
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}
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}
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}
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return result;
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}
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}
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