user_simulator.c 8.64 KB
Newer Older
gauthier's avatar
 
gauthier committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312
/*****************************************************************************
      Eurecom OpenAirInterface 3
      Copyright(c) 2012 Eurecom

Source    user_simulator.c

Version   0.1

Date    2012/10/09

Product   User simulator

Subsystem User simulator main process

Author    Frederic Maurel

Description Implements the user simulator running at the user application
    layer for NAS testing purpose.

*****************************************************************************/

#include "user_parser.h"

#include "include/commonDef.h"
#include "util/socket.h"
#include "util/device.h"

#include <stdio.h>  // printf, perror
#include <errno.h>  // errno
#include <netdb.h>  // gai_strerror
#include <ctype.h>  // isspace
#include <stdlib.h> // exit
#include <signal.h> // sigaction
#include <string.h> // memset
#include <pthread.h>
#include <poll.h>

/****************************************************************************/
/****************  E X T E R N A L    D E F I N I T I O N S  ****************/
/****************************************************************************/

/****************************************************************************/
/*******************  L O C A L    D E F I N I T I O N S  *******************/
/****************************************************************************/

#define USER_SIMULATOR_BUFFER_SIZE 1024

/*
 * String buffer used to send AT commands to the NAS sublayer
 */
static char _user_simulator_send_buffer [USER_SIMULATOR_BUFFER_SIZE];

/*
 * String buffer used to receive responses from the NAS sublayer
 */
static char _user_simulator_recv_buffer [USER_SIMULATOR_BUFFER_SIZE];

/*
 * The connection endpoint used for communication with the
 * NAS sublayer (see src/api/user/user_api.c)
 */
static struct {
  void* endpoint;
  void*   (*open) (int, const char*, const char*);
  int     (*getfd)(const void*);
  ssize_t (*recv) (void*, char*, size_t);
  ssize_t (*send) (const void*, const char*, size_t);
  void    (*close)(void*);
} _user_simulator_id;
//static socket_id_t * _user_simulator_sid;

#define USER_OPEN(a, b, c)  _user_simulator_id.open(a, b, c)
#define USER_GETFD()    _user_simulator_id.getfd(_user_simulator_id.endpoint)
#define USER_RECV(a, b)   _user_simulator_id.recv(_user_simulator_id.endpoint, a, b)
#define USER_SEND(a, b)   _user_simulator_id.send(_user_simulator_id.endpoint, a, b)
#define USER_CLOSE()    _user_simulator_id.close(_user_simulator_id.endpoint)

static int _set_signal_handler(int signal, void (handler)(int));
static void _signal_handler(int signal_number);
static void* _receive_thread(void* arg);

/****************************************************************************/
/******************  E X P O R T E D    F U N C T I O N S  ******************/
/****************************************************************************/

/****************************************************************************/
int main (int argc, const char* argv[])
{
  /*
   * Get the command line options
   */
  if ( user_parser_get_options(argc, argv) != RETURNok ) {
    user_parser_print_usage();
    exit(EXIT_FAILURE);
  }

  const char* host = user_parser_get_host();
  const char* port = user_parser_get_port();
  const char* devpath = user_parser_get_devpath();
  const char* devattr = user_parser_get_devattr();

  printf("%s -host %s -port %s -dev %s -params %s\n",
         argv[0], host, port, devpath, devattr);

  /*
   * Initialize the communication channel to the NAS sublayer
   */
  if (devpath) {
    /* Initialize device handlers */
    _user_simulator_id.open  = device_open;
    _user_simulator_id.getfd = device_get_fd;
    _user_simulator_id.recv  = device_read;
    _user_simulator_id.send  = device_write;
    _user_simulator_id.close = device_close;

    /* Initialize communication channel */
    _user_simulator_id.endpoint = USER_OPEN(DEVICE, devpath, devattr);

    if (_user_simulator_id.endpoint == NULL) {
      perror("ERROR\t: Failed to open connection endpoint");
      exit(EXIT_FAILURE);
    }

    printf("INFO\t: The User Simulator is now connected to %s (%d)\n",
           devpath, USER_GETFD());
  } else {
    /* Initialize network socket handlers */
    _user_simulator_id.open  = socket_udp_open;
    _user_simulator_id.getfd = socket_get_fd;
    _user_simulator_id.recv  = socket_recv;
    _user_simulator_id.send  = socket_send;
    _user_simulator_id.close = socket_close;

    /* Initialize communication channel */
    _user_simulator_id.endpoint = USER_OPEN(SOCKET_CLIENT, host, port);

    if (_user_simulator_id.endpoint == NULL) {
      const char* error = ( (errno < 0) ?
                            gai_strerror(errno) : strerror(errno) );
      printf("ERROR\t: Failed to open connection endpoint: %s\n", error);
      exit(EXIT_FAILURE);
    }

    printf("INFO\t: The User Simulator is now connected to %s/%s (%d)\n",
           host, port, USER_GETFD());
  }


  /*
   * Set up signal handler
   */
  (void) _set_signal_handler(SIGINT, _signal_handler);
  (void) _set_signal_handler(SIGTERM, _signal_handler);

  /*
   * Create the receiving thread
   */
  pthread_attr_t attr;
  pthread_t thread_id;
  pthread_attr_init(&attr);
  pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
  pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
  int rc = pthread_create (&thread_id, &attr, _receive_thread, NULL);

  if (rc != 0) {
    perror("ERROR\t: pthread_create() failed");
    USER_CLOSE();
    exit(EXIT_FAILURE);
  }

  /*
   * User simulator main loop
   */
  while (TRUE) {
    char c;
    int len;

    /* Get the AT command */
    printf("AT command (q to quit) > ");
    c = getchar();

    if (c == 'q') break;

    if (c == '\n') continue;

    len = 0;

    while ( (len < USER_SIMULATOR_BUFFER_SIZE - 1) && (c != '\n') ) {
      if (!isspace(c)) {
        _user_simulator_send_buffer[len++] = c;
      }

      c = getchar();
    }

    _user_simulator_send_buffer[len++] = '\r';
    _user_simulator_send_buffer[len] = '\0';

    /* Send the AT command to the NAS sublayer */
    int sbytes = USER_SEND(_user_simulator_send_buffer, len);

    if (sbytes == RETURNerror) {
      perror("ERROR\t: Failed to send data to the NAS sublayer");
      break;
    }

#if 0
    /* Send the AT command one byte at a time (serial port simulation) */
    const char* pbuffer = _user_simulator_send_buffer;

    while (*pbuffer) {
      int sbytes = USER_SEND(pbuffer++, 1);

      if (sbytes == RETURNerror) {
        perror("ERROR\t: Failed to send data to the NAS sublayer");
        break;
      }

      (void)poll(0, 0, 10);
    }

#endif

    (void)poll(0, 0, 100);
  }

  /*
   * Termination cleanup
   */
  printf("INFO\t: Closing user endpoint descriptor %d\n", USER_GETFD());
  USER_CLOSE();

  printf("INFO\t: User simulator exited\n");
  exit(EXIT_SUCCESS);
}

/****************************************************************************/
/*********************  L O C A L    F U N C T I O N S  *********************/
/****************************************************************************/

/*
 * Signal handler setup function
 */
static int _set_signal_handler(int signal, void (handler)(int))
{
  struct sigaction act;

  /* Initialize signal set */
  (void) memset (&act, 0, sizeof (act));
  (void) sigfillset (&act.sa_mask);
  (void) sigdelset (&act.sa_mask, SIGHUP);
  (void) sigdelset (&act.sa_mask, SIGINT);
  (void) sigdelset (&act.sa_mask, SIGTERM);
  (void) sigdelset (&act.sa_mask, SIGILL);
  (void) sigdelset (&act.sa_mask, SIGTRAP);
  (void) sigdelset (&act.sa_mask, SIGIOT);
#ifndef LINUX
  (void) sigdelset (&act.sa_mask, SIGEMT);
#endif
  (void) sigdelset (&act.sa_mask, SIGFPE);
  (void) sigdelset (&act.sa_mask, SIGBUS);
  (void) sigdelset (&act.sa_mask, SIGSEGV);
  (void) sigdelset (&act.sa_mask, SIGSYS);

  /* Initialize signal handler */
  act.sa_handler = handler;

  if ( sigaction (signal, &act, 0) < 0 ) {
    return RETURNerror;
  }

  return RETURNok;
}

/*
 * Signal handler
 */
static void _signal_handler(int signal_number)
{
  printf("\nWARNING\t: Signal %d received\n", signal_number);
  printf("INFO\t: Closing user socket %d\n", USER_GETFD());
  USER_CLOSE();
  printf("INFO\t: User simulator exited\n");
  exit(EXIT_SUCCESS);
}

/*
 * Receiving thread
 */
static void* _receive_thread(void* arg)
{
  while (TRUE) {
    /* Receive AT response from the NAS sublayer */
    int rbytes = USER_RECV(_user_simulator_recv_buffer,
                           USER_SIMULATOR_BUFFER_SIZE);

    if (rbytes != 0) {
      if (rbytes == RETURNerror) {
        perror("ERROR\t: Failed to receive data from the NAS sublayer");
        break;
      }

      _user_simulator_recv_buffer[rbytes] = '\0';

      /* Display AT response */
      printf("%s\n", _user_simulator_recv_buffer);
    }
  }

  return (NULL);
}