How to send and receive a file bi-bidirectionally using tcp/ip protocol?

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I would like to read a file and send it to client, the client has to receive the file and send the same file back to server. I have developed the code, but i am not able to send and receive data. Can someone guide me in sorting this issue out? I am giving the code for further reference.

/****************** SERVER CODE ****************/

#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>

int main()
{
  int socket_desc, newSocket;
  char buffer[1024];
  struct sockaddr_in serverAddr;
  struct sockaddr_storage serverStorage;
  socklen_t addr_size;

  /*---- Create the socket. The three arguments are: ----*/
  /* 1) Internet domain 2) Stream socket 3) Default protocol (TCP in this case) */

  socket_desc = socket(AF_INET, SOCK_STREAM, 0);
  
  /*---- Configure settings of the server address struct ----*/
  /* Address family = Internet */

  serverAddr.sin_family = AF_INET;

  /* Set port number, using htons function to use proper byte order */

  serverAddr.sin_port = htons(6777);

  /* Set IP address to localhost */

  serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");

  /* Set all bits of the padding field to 0 */

  memset(serverAddr.sin_zero, '\0', sizeof serverAddr.sin_zero);  

  /*---- Bind the address struct to the socket ----*/

  bind(socket_desc, (struct sockaddr *) &serverAddr, sizeof(serverAddr));
  puts("Bind Completed:");

  /*---- Listen on the socket, with 5 max connection requests queued ----*/

  if(listen(socket_desc,5)==0)
    printf("Listening\n");
  else
    printf("Error\n");

  /*---- Accept call creates a new socket for the incoming connection ----*/

  addr_size = sizeof serverStorage;
  newSocket = accept(socket_desc, (struct sockaddr *) &serverStorage, &addr_size);
  puts("Connection is Accepted:");

  /*---- Send message to the socket of the incoming connection ----*/

   FILE *fp;
   FILE *recvfp;   
   int size=0,read_size=0,tot_size=0; 
   int i=0,stat=0,write_size=0,file_size=1;
   char file_buffer[1024],received_int[10],clientSocket;
   fp = fopen("/home/sosdt009/Desktop/character2.txt","r");
   recvfp = fopen("/home/sosdt009/Desktop/Rrec.txt","w");
   fseek(fp, 0, SEEK_END); // seek to end of file
   size = ftell(fp); // get current file pointer   
   while (size>tot_size)
   {
 		//Read from the file into our send buffer
		printf("Ready for sending \n");
		read_size = fread(buffer,sizeof(buffer),1,fp);	
		printf("Read size value is %d: \n",read_size);	
		//printf(" Multiple loop \n");		
		stat = send(clientSocket,buffer,read_size, 0);
		while (stat < 0);
                tot_size=tot_size+read_size;   		  
   }
    while(file_size>0)
   {
     printf("Receiving: \n");
     file_size=recv(clientSocket,file_buffer,sizeof(file_buffer), 0);
     printf("%d",file_size);
     write_size = fwrite(file_buffer,1,file_size,recvfp); 
     printf("bytes=%d",write_size);
   }
  shutdown(clientSocket,1);
  fclose(fp);
  fclose(recvfp);
  close(clientSocket);
  //printf("read size value is %d: \n",read_size);	
  //printf("size=%d",size);
  return 0;
}

and the client code is as follows

/****************** CLIENT CODE ****************/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>

void main()
{
  int ClientSocket;
  struct sockaddr_in serverAddr;
  socklen_t addr_size;

  /*---- Create the socket. The three arguments are: ----*/
  /* 1) Internet domain 2) Stream socket 3) Default protocol (TCP in this case) */

  ClientSocket = socket(AF_INET, SOCK_STREAM, 0);
  
  /*---- Configure settings of the server address struct ----*/
  /* Address family = Internet */

  serverAddr.sin_family = AF_INET;

  /* Set port number, using htons function to use proper byte order */

  serverAddr.sin_port = htons(6777);

  /* Set IP address to localhost */

  serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");

  /* Set all bits of the padding field to 0 */

  memset(serverAddr.sin_zero, '\0', sizeof serverAddr.sin_zero);  

  /*---- Connect the socket to the server using the address struct ----*/

  addr_size = sizeof serverAddr;
  if(connect(ClientSocket, (struct sockaddr *) &serverAddr, addr_size)<0)
  {
	puts("Connection failed:");
	exit(0);
  }
  else
  {
	puts("Connection open for data:");
  }  
   FILE *fp;
   FILE *recvfp;   

   int size=0,read_size=0,tot_size=0; 
   int i=0,stat=0,write_size=0,file_size=1;
   char buffer[1024],file_buffer[1024],received_int[10];

   fp = fopen("/home/sosdt009/Desktop/character.txt", "r");
   recvfp = fopen("/home/sosdt009/Desktop/character.txt", "w");

   //fseek(fp, 0, SEEK_END); // seek to end of file
   //size = ftell(fp); // get current file pointer    
    
  /* sprintf(received_int, "%ld", size);
    printf("Sent int=%s",received_int);*/
  /*  send(clientSocket,received_int,sizeof(received_int),0);*/
    
  /* strcpy(received_int,"empty\n");
    recv(clientSocket, received_int,sizeof(received_int), 0);*/

  //write(clientSocket,&size, sizeof(size));
  // read(clientSocket, &received_int, sizeof(received_int));
  
  //recv(clientSocket, received_int,sizeof(received_int), 0);
  //printf("Received int=%s",received_int); 
  // fseek(fp, 0, SEEK_SET);
  // fread(buffer,size, 1, fp);   

  while(file_size>0)
   {
     printf("Receiving: \n");
     file_size=recv(ClientSocket,file_buffer,sizeof(file_buffer), 0);
     printf("%d",file_size);
     write_size = fwrite(file_buffer,1,file_size,recvfp); 
     printf("bytes=%d",write_size);
   }
  while (size>tot_size)
  { 
		//Read from the file into our send buffer
		//printf("Ready for sending \n");
		read_size = fread(file_buffer,1,sizeof(file_buffer),fp);	
		printf("read size value is %d: \n",read_size);	
		do
		{
			printf(" Multiple loop \n");		
			stat = send(ClientSocket,buffer,read_size, 0);
		} while (stat < 0);
                tot_size=tot_size+read_size;    		  
  }
  shutdown(ClientSocket,1);
  fclose(fp);
  printf("read size value is %d: \n",read_size);	
  printf("size=%d",size);
 /* while(file_size>0)
  {
     printf("Receiving: \n");
     file_size=recv(clientSocket,file_buffer,sizeof(file_buffer), 0);
     printf("%d",file_size);
     write_size = fwrite(file_buffer,1,file_size,recvfp); 
     printf("bytes=%d",write_size);
  }*/

  fclose(recvfp);
  close(ClientSocket);
/*Complete file block*/

//printf("%ld,%s\n", size,buffer);
//send(clientSocket,buffer,size,0);
//strcpy(buffer,"empty\n");
//recv(clientSocket, buffer, 1024, 0);

  /*---- Print the received message ----*/
//printf("Data received: %s",buffer);   
}

Posted 15-Oct-15 20:32pm

venkat28vk

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venkat28vk 16-Oct-15 2:34am

The connections are established, but the problem here is i am not able to send and receive the file.

CPallini 16-Oct-15 3:24am

What do you mean with 'i am not able to send and receive data'? What is the problem, exactly?

venkat28vk 16-Oct-15 3:29am

@pallini. I need to read a file and send it to the client and the client has to send the same file back to server, this is the actual requirement. As far as i have done is just the connection is established, but not able to read and write data.

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Jochen Arndt · Accepted Answer · 2015-10-15T22:33:00

I don't know if there are more errors but I found at least three:

In your server code you are using clientSocket for reading and writing but it has never been initialised. Use the socket descriptor returned by the accept call instead (newSocket).

In your server code you are setting the file pointer of the input file to the end to get the file size but forgot to set it back to the begin before reading from the file.

This server code part is wrong:

C++

stat = send(clientSocket,buffer,read_size, 0);
while (stat < 0);
        tot_size=tot_size+read_size;

When the return value is -1, the call failed (and should be here according to the first error described above).

While your program does not work as intended you should check all function return values and print them upon failure. So you know which call fails at which program step. You did this already for some calls. So add the output to your question. That makes it much easier for us to help.