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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* unixsocket.cpp - Unix socket IPC test
*/
#include <algorithm>
#include <fcntl.h>
#include <iostream>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <libcamera/event_dispatcher.h>
#include <libcamera/timer.h>
#include "libcamera/internal/ipc_unixsocket.h"
#include "libcamera/internal/thread.h"
#include "libcamera/internal/utils.h"
#include "test.h"
#define CMD_CLOSE 0
#define CMD_REVERSE 1
#define CMD_LEN_CALC 2
#define CMD_LEN_CMP 3
#define CMD_JOIN 4
using namespace std;
using namespace libcamera;
int calculateLength(int fd)
{
lseek(fd, 0, 0);
int size = lseek(fd, 0, SEEK_END);
lseek(fd, 0, 0);
return size;
}
class UnixSocketTestSlave
{
public:
UnixSocketTestSlave()
: exitCode_(EXIT_FAILURE), exit_(false)
{
dispatcher_ = Thread::current()->eventDispatcher();
ipc_.readyRead.connect(this, &UnixSocketTestSlave::readyRead);
}
int run(int fd)
{
if (ipc_.bind(fd)) {
cerr << "Failed to connect to IPC channel" << endl;
return EXIT_FAILURE;
}
while (!exit_)
dispatcher_->processEvents();
ipc_.close();
return exitCode_;
}
private:
void readyRead(IPCUnixSocket *ipc)
{
IPCUnixSocket::Payload message, response;
int ret;
ret = ipc->receive(&message);
if (ret) {
cerr << "Receive message failed: " << ret << endl;
return;
}
const uint8_t cmd = message.data[0];
switch (cmd) {
case CMD_CLOSE:
stop(0);
break;
case CMD_REVERSE: {
response.data = message.data;
std::reverse(response.data.begin() + 1, response.data.end());
ret = ipc_.send(response);
if (ret < 0) {
cerr << "Reverse failed" << endl;
stop(ret);
}
break;
}
case CMD_LEN_CALC: {
int size = 0;
for (int fd : message.fds)
size += calculateLength(fd);
response.data.resize(1 + sizeof(size));
response.data[0] = cmd;
memcpy(response.data.data() + 1, &size, sizeof(size));
ret = ipc_.send(response);
if (ret < 0) {
cerr << "Calc failed" << endl;
stop(ret);
}
break;
}
case CMD_LEN_CMP: {
int size = 0;
for (int fd : message.fds)
size += calculateLength(fd);
int cmp;
memcpy(&cmp, message.data.data() + 1, sizeof(cmp));
if (cmp != size) {
cerr << "Compare failed" << endl;
stop(-ERANGE);
}
break;
}
case CMD_JOIN: {
int outfd = open("/tmp", O_TMPFILE | O_RDWR,
S_IRUSR | S_IWUSR);
if (outfd < 0) {
cerr << "Create out file failed" << endl;
stop(outfd);
return;
}
for (int fd : message.fds) {
while (true) {
char buf[32];
ssize_t num = read(fd, &buf, sizeof(buf));
if (num < 0) {
cerr << "Read failed" << endl;
stop(-EIO);
return;
} else if (!num)
break;
if (write(outfd, buf, num) < 0) {
cerr << "Write failed" << endl;
stop(-EIO);
return;
}
}
close(fd);
}
lseek(outfd, 0, 0);
response.data.push_back(CMD_JOIN);
response.fds.push_back(outfd);
ret = ipc_.send(response);
if (ret < 0) {
cerr << "Join failed" << endl;
stop(ret);
}
close(outfd);
break;
}
default:
cerr << "Unknown command " << cmd << endl;
stop(-EINVAL);
break;
}
}
void stop(int code)
{
exitCode_ = code;
exit_ = true;
}
IPCUnixSocket ipc_;
EventDispatcher *dispatcher_;
int exitCode_;
bool exit_;
};
class UnixSocketTest : public Test
{
protected:
int slaveStart(int fd)
{
pid_ = fork();
if (pid_ == -1)
return TestFail;
if (!pid_) {
std::string arg = std::to_string(fd);
execl("/proc/self/exe", "/proc/self/exe",
arg.c_str(), nullptr);
/* Only get here if exec fails. */
exit(TestFail);
}
return TestPass;
}
int slaveStop()
{
int status;
if (pid_ < 0)
return TestFail;
if (waitpid(pid_, &status, 0) < 0)
return TestFail;
if (!WIFEXITED(status) || WEXITSTATUS(status))
return TestFail;
return TestPass;
}
int testReverse()
{
IPCUnixSocket::Payload message, response;
int ret;
message.data = { CMD_REVERSE, 1, 2, 3, 4, 5 };
ret = call(message, &response);
if (ret)
return ret;
std::reverse(response.data.begin() + 1, response.data.end());
if (message.data != response.data)
return TestFail;
return 0;
}
int testEmptyFail()
{
IPCUnixSocket::Payload message;
return ipc_.send(message) != -EINVAL;
}
int testCalc()
{
IPCUnixSocket::Payload message, response;
int sizeOut, sizeIn, ret;
sizeOut = prepareFDs(&message, 2);
if (sizeOut < 0)
return sizeOut;
message.data.push_back(CMD_LEN_CALC);
ret = call(message, &response);
if (ret)
return ret;
memcpy(&sizeIn, response.data.data() + 1, sizeof(sizeIn));
if (sizeOut != sizeIn)
return TestFail;
return 0;
}
int testCmp()
{
IPCUnixSocket::Payload message;
int size;
size = prepareFDs(&message, 7);
if (size < 0)
return size;
message.data.resize(1 + sizeof(size));
message.data[0] = CMD_LEN_CMP;
memcpy(message.data.data() + 1, &size, sizeof(size));
if (ipc_.send(message))
return TestFail;
return 0;
}
int testFdOrder()
{
IPCUnixSocket::Payload message, response;
int ret;
static const char *strings[2] = {
"Foo",
"Bar",
};
int fds[2];
for (unsigned int i = 0; i < ARRAY_SIZE(strings); i++) {
unsigned int len = strlen(strings[i]);
fds[i] = open("/tmp", O_TMPFILE | O_RDWR,
S_IRUSR | S_IWUSR);
if (fds[i] < 0)
return TestFail;
ret = write(fds[i], strings[i], len);
if (ret < 0)
return TestFail;
lseek(fds[i], 0, 0);
message.fds.push_back(fds[i]);
}
message.data.push_back(CMD_JOIN);
ret = call(message, &response);
if (ret)
return ret;
for (unsigned int i = 0; i < ARRAY_SIZE(strings); i++) {
unsigned int len = strlen(strings[i]);
char buf[len];
close(fds[i]);
if (read(response.fds[0], &buf, len) <= 0)
return TestFail;
if (memcmp(buf, strings[i], len))
return TestFail;
}
close(response.fds[0]);
return 0;
}
int init()
{
callResponse_ = nullptr;
return 0;
}
int run()
{
int slavefd = ipc_.create();
if (slavefd < 0)
return TestFail;
if (slaveStart(slavefd)) {
cerr << "Failed to start slave" << endl;
return TestFail;
}
ipc_.readyRead.connect(this, &UnixSocketTest::readyRead);
/* Test reversing a string, this test sending only data. */
if (testReverse()) {
cerr << "Reverse array test failed" << endl;
return TestFail;
}
/* Test that an empty message fails. */
if (testEmptyFail()) {
cerr << "Empty message test failed" << endl;
return TestFail;
}
/* Test offloading a calculation, this test sending only FDs. */
if (testCalc()) {
cerr << "Calc test failed" << endl;
return TestFail;
}
/* Test fire and forget, this tests sending data and FDs. */
if (testCmp()) {
cerr << "Cmp test failed" << endl;
return TestFail;
}
/* Test order of file descriptors. */
if (testFdOrder()) {
cerr << "fd order test failed" << endl;
return TestFail;
}
/* Close slave connection. */
IPCUnixSocket::Payload close;
close.data.push_back(CMD_CLOSE);
if (ipc_.send(close)) {
cerr << "Closing IPC channel failed" << endl;
return TestFail;
}
ipc_.close();
if (slaveStop()) {
cerr << "Failed to stop slave" << endl;
return TestFail;
}
return TestPass;
}
private:
int call(const IPCUnixSocket::Payload &message, IPCUnixSocket::Payload *response)
{
Timer timeout;
int ret;
callDone_ = false;
callResponse_ = response;
ret = ipc_.send(message);
if (ret)
return ret;
timeout.start(200);
while (!callDone_) {
if (!timeout.isRunning()) {
cerr << "Call timeout!" << endl;
callResponse_ = nullptr;
return -ETIMEDOUT;
}
Thread::current()->eventDispatcher()->processEvents();
}
callResponse_ = nullptr;
return 0;
}
void readyRead(IPCUnixSocket *ipc)
{
if (!callResponse_) {
cerr << "Read ready without expecting data, fail." << endl;
return;
}
if (ipc->receive(callResponse_)) {
cerr << "Receive message failed" << endl;
return;
}
callDone_ = true;
}
int prepareFDs(IPCUnixSocket::Payload *message, unsigned int num)
{
int fd = open("/proc/self/exe", O_RDONLY);
if (fd < 0)
return fd;
int size = 0;
for (unsigned int i = 0; i < num; i++) {
int clone = dup(fd);
if (clone < 0)
return clone;
size += calculateLength(clone);
message->fds.push_back(clone);
}
close(fd);
return size;
}
pid_t pid_;
IPCUnixSocket ipc_;
bool callDone_;
IPCUnixSocket::Payload *callResponse_;
};
/*
* Can't use TEST_REGISTER() as single binary needs to act as both proxy
* master and slave.
*/
int main(int argc, char **argv)
{
if (argc == 2) {
int ipcfd = std::stoi(argv[1]);
UnixSocketTestSlave slave;
return slave.run(ipcfd);
}
return UnixSocketTest().execute();
}
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