rtes_messenger/src/listener.c

/*!
 * \file    listener.c
 * \brief   Listener related functionality
 *
 * \author Christos Choutouridis AEM:8997 <cchoutou@ece.auth.gr>
 */

#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
//#include <pthread.h>

#include "listener.h"

static void srv_action (device_t* d, char_t* buffer, size_t size) {
   msg_t msg = { .sender =*d, .recipients =NULL };
   cMsg_parse (&msg.cMsg, buffer, size);

   mIter_t myCopy = msgList_find (&msgList, &msg);
   if (myCopy == -1) {
      // I don't have a copy after all
      msgList_add (&msgList, &msg);
      log_msg_io (&msg);  // semaphore
   }
   else {
      // Do not forward a duplicate message to sender, he already has it
      devList_add (&msgList, myCopy, &msg.sender);
      #ifndef NO_DEBUG
         log_debug("Debug: Duplicate message from: %d\n", msg.sender.id);
      #endif
   }
}

status_t listener() {
   int srvSock;
   struct sockaddr_in srvAddPort;
   char_t buffer[256];

   memset(&srvAddPort, 0, sizeof(srvAddPort));
   srvAddPort.sin_family= AF_INET;
   srvAddPort.sin_port= htons(settings.port);
   srvAddPort.sin_addr.s_addr = htonl(INADDR_ANY);

   if ((srvSock = socket (PF_INET, SOCK_STREAM, 0)) == -1) {
      log_error ("Error: Can not create socket\n");
      return MSG_ERROR;
   }
   #ifndef NO_DEBUG
      log_debug("Debug: Socket for listening created\n");
   #endif
   if(bind(srvSock, (struct sockaddr *) &srvAddPort, sizeof(srvAddPort)) == -1) {
      log_error ("Error: Can not bind socket to port %d\n", settings.port);
      close (srvSock);
      return MSG_ERROR;
   }
   if (listen (srvSock, DEVICE_LIST_SIZE) == -1) {
      log_error ("Error: Can not enable socket\n");
      close (srvSock);
      return MSG_ERROR;
   }
   #ifndef NO_DEBUG
      log_debug("Debug: Listening on [0.0.0.0], port %d\n", settings.port);
   #endif
   while (1) {
      struct sockaddr_in clntAddr;
      size_t clntLen= sizeof(clntAddr);
      int clntSock;
      int rcvBytes;

      if ((clntSock = accept (srvSock, (struct sockaddr *)&clntAddr, (socklen_t*)&clntLen)) == -1) {
         close (srvSock);
         continue;
      }
      #ifndef NO_DEBUG
         devIP_t ip = addr2ip(ntohl(clntAddr.sin_addr.s_addr));
         log_debug ("Debug: Connection from %u.%u.%u.%u port:%u received\n",
            ip.A, ip.B, ip.C, ip.D, clntAddr.sin_port
         );
      #endif
      if ((rcvBytes = recv(clntSock, buffer, sizeof(buffer), 0)) < 0) {
         log_error ("Error: Fail to receive from socket\n");
         close (srvSock);
         close (clntSock);
         continue;
      }
      buffer[rcvBytes] = '\0';
      close(clntSock);

      device_t dev = addr2device (ntohl(clntAddr.sin_addr.s_addr));
      #ifndef NO_DEBUG
         log_debug ("Debug: Message from %u.%u.%u.%u port:%u received\n");
      #endif
      srv_action (&dev, buffer, rcvBytes);
   }

   close(srvSock);
   #ifndef NO_DEBUG
      log_debug ("Debug: Socket for listening closed\n");
   #endif
   return MSG_OK;
}



void* thListener(void* ptr) {
   (void)&ptr;    // use parameter
   listener();
   return NULL;
}