/*
 * Copyright 2016 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.
 */
#define LOG_TAG "VtsAgentTcpServer"

#include "TcpServerForRunner.h"

#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>

#include <android-base/logging.h>

#include "AgentRequestHandler.h"
#include "BinderClientToDriver.h"
#include "test/vts/proto/AndroidSystemControlMessage.pb.h"

namespace android {
namespace vts {

// Starts to run a TCP server (foreground).
int StartTcpServerForRunner(const char* spec_dir_path,
                            const char* hal_driver_path32,
                            const char* hal_driver_path64,
                            const char* shell_driver_path32,
                            const char* shell_driver_path64) {
  int sockfd;
  socklen_t clilen;
  struct sockaddr_in serv_addr;
  struct sockaddr_in cli_addr;

  sockfd = socket(AF_INET, SOCK_STREAM, 0);
  if (sockfd < 0) {
    LOG(ERROR) << "Can't open the socket.";
    return -1;
  }

  bzero((char*)&serv_addr, sizeof(serv_addr));
  serv_addr.sin_family = AF_INET;
  serv_addr.sin_addr.s_addr = INADDR_ANY;
  serv_addr.sin_port = htons(0);

  if (::bind(sockfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) == -1) {
    PLOG(ERROR) << "bind failed";
    return -1;
  }

  socklen_t sa_len = sizeof(serv_addr);
  if (getsockname(sockfd, (struct sockaddr*) &serv_addr, &sa_len) == -1) {
    PLOG(ERROR) << "getsockname failed";
    return -1;
  }

  LOG(DEBUG) << "TCP server port is " << (int)ntohs(serv_addr.sin_port);
  FILE* fp = fopen("/data/local/tmp/vts_tcp_server_port", "wt");
  if (!fp) {
    LOG(ERROR) << "Can't write to "
               << "/data/local/tmp/vts_tcp_server_port";
    return -1;
  }
  fprintf(fp, "%d", (int) ntohs(serv_addr.sin_port));
  fclose(fp);

  LOG(DEBUG) << "Listening";
  if (listen(sockfd, 5) == -1) {
    LOG(ERROR) << " listen failed.";
    return -1;
  }
  clilen = sizeof(cli_addr);
  while (true) {
    LOG(DEBUG) << "Accepting";
    int newsockfd = ::accept(sockfd, (struct sockaddr*)&cli_addr, &clilen);
    if (newsockfd < 0) {
      LOG(ERROR) << "accept failed";
      return -1;
    }

    LOG(DEBUG) << "[runner->agent] NEW SESSION";
    LOG(DEBUG) << "[runner->agent] ===========";
    pid_t pid = fork();
    if (pid == 0) {  // child
      close(sockfd);
      LOG(DEBUG) << "Process for a runner - pid = " << getpid();
      AgentRequestHandler handler(spec_dir_path, hal_driver_path32,
                                  hal_driver_path64, shell_driver_path32,
                                  shell_driver_path64);
      handler.SetSockfd(newsockfd);
      while (handler.ProcessOneCommand())
        ;
      exit(-1);
    } else if (pid < 0) {
      LOG(ERROR) << "Can't fork a child process to handle a session.";
      return -1;
    } else {
      close(newsockfd);
    }
  }
  return 0;
}

}  // namespace vts
}  // namespace android