C language to achieve Linux socket file transfer instances

This article illustrates the C language to realize socket file transfer under Linux. Share with you for your reference. The details are as follows:

Server. C is as follows:

////////////////////////////////////
//Server code
///////////////////////////////////
//This file is the code for the server
#include <netinet/in.h>  // for sockaddr_in
#include <sys/types.h>  // for socket
#include <sys/socket.h>  // for socket
#include <stdio.h>    // for printf
#include <stdlib.h>    // for exit
#include <string.h>    // for bzero
#include <time.h>        //for time_t and time
#define HELLO_WORLD_SERVER_PORT 7754
#define LENGTH_OF_LISTEN_QUEUE 20
#define BUFFER_SIZE 1024
int main(int argc, char **argv)
{
//Set a socket address structure server_addr, representing the server Internet address, port
struct sockaddr_in server_addr;
bzero(&server_addr,sizeof(server_addr)); //Set all the contents of a section of memory to 0
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htons(INADDR_ANY);
server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
// time_t now;
FILE *stream;
//Create a streaming protocol (TCP)socket for the Internet, with server_socket representing the server socket
int server_socket = socket(AF_INET,SOCK_STREAM,0);
if( server_socket < 0)
{
printf("Create Socket Failed!");
exit(1);
}
//Connect the socket to the socket address structure
if( bind(server_socket,(struct sockaddr*)&server_addr,sizeof(server_addr)))
{
printf("Server Bind Port : %d Failed!", HELLO_WORLD_SERVER_PORT);
exit(1);
}
//Server_socket is used for listening
if ( listen(server_socket, LENGTH_OF_LISTEN_QUEUE) )
{
printf("Server Listen Failed!");
exit(1);
}
while (1) //The server side runs all the time
{
struct sockaddr_in client_addr;
socklen_t length = sizeof(client_addr);
int new_server_socket = accept(server_socket,(struct sockaddr*)&client_addr,&length);
if ( new_server_socket < 0)
{
printf("Server Accept Failed!n");
break;
}
char buffer[BUFFER_SIZE];
bzero(buffer, BUFFER_SIZE);
strcpy(buffer,"Hello,World!  From the server! ");
strcat(buffer,"n"); //C string concatenation
send(new_server_socket,buffer,BUFFER_SIZE,0);
bzero(buffer,BUFFER_SIZE);
//Receives information sent by the client to the buffer
length = recv(new_server_socket,buffer,BUFFER_SIZE,0);
if (length < 0)
{
printf("Server Recieve Data Failed!n");
exit(1);
}
printf("n%s",buffer);
if((stream = fopen("data1","r"))==NULL)
{
printf("The file 'data1' was not opened! n");
exit(1);
}
else
printf("The file 'filename' was opened! n");
bzero(buffer,BUFFER_SIZE);
int lengsize = 0;
while((lengsize = fread(buffer,1,1024,stream)) > 0)
{
printf("lengsize = %dn",lengsize);
if(send(new_server_socket,buffer,lengsize,0)<0)
{
printf("Send File is Failedn");
break;
}
bzero(buffer, BUFFER_SIZE);
}
if(fclose(stream))
printf("The file 'data' was not closed! n");
exit(1);    
//Close the connection to the client
close(new_server_socket);    
}
//Close the socket for listening
close(server_socket);
return 0;
}

Client. C is as follows:

////////////////////////////////////
//Client code
///////////////////////////////////
//This file is the code for the client
#include <netinet/in.h>  // for sockaddr_in
#include <sys/types.h>  // for socket
#include <sys/socket.h>  // for socket
#include <stdio.h>    // for printf
#include <stdlib.h>    // for exit
#include <string.h>    // for bzero
#include <time.h>        //for time_t and time
#include <arpa/inet.h>
#define HELLO_WORLD_SERVER_PORT  7754
#define BUFFER_SIZE 1024
int main(int argc, char **argv)
{
if (argc != 2)
{
printf("Usage: ./%s ServerIPAddressn",argv[0]);
exit(1);
}
//time_t now;
FILE *stream;
//Set a socket address structure client_addr, representing the client Internet address, port
struct sockaddr_in client_addr;
bzero(&client_addr,sizeof(client_addr)); //Set all the contents of a section of memory to 0
client_addr.sin_family = AF_INET;  //The family of Internet protocol
client_addr.sin_addr.s_addr = htons(INADDR_ANY);//INADDR_ANY means automatically getting the local address
client_addr.sin_port = htons(0);  //0 means to have the system automatically assign a free port
//Creates a stream protocol (TCP)socket for the Internet, with client_socket representing the client socket
int client_socket = socket(AF_INET,SOCK_STREAM,0);
if( client_socket < 0)
{
printf("Create Socket Failed!n");
exit(1);
}
//Associate the client's socket with the client's socket address structure
if( bind(client_socket,(struct sockaddr*)&client_addr,sizeof(client_addr)))
{
printf("Client Bind Port Failed!n");
exit(1);
}
//Set a socket address structure server_addr, which represents the server's Internet address, port
struct sockaddr_in server_addr;
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family = AF_INET;
if(inet_aton(argv[1],&server_addr.sin_addr) == 0) //The IP address of the server comes from the parameters of the program
{
printf("Server IP Address Error!n");
exit(1);
}
server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
socklen_t server_addr_length = sizeof(server_addr);
//Initiates a connection to the server, and after a successful connection client_socket represents a socket connection between the client and the server
if(connect(client_socket,(struct sockaddr*)&server_addr, server_addr_length) < 0)
{
printf("Can Not Connect To %s!n",argv[1]);
exit(1);
}
char buffer[BUFFER_SIZE];
bzero(buffer,BUFFER_SIZE);
//Receive data from the server to the buffer
int length = recv(client_socket,buffer,BUFFER_SIZE,0);
if(length < 0)
{
printf("Recieve Data From Server %s Failed!n", argv[1]);
exit(1);
}
printf("n%sn",buffer);
bzero(buffer,BUFFER_SIZE);
bzero(buffer,BUFFER_SIZE);
strcpy(buffer,"Hello, World! From Clientn");
//Sends the data in the buffer to the server
send(client_socket,buffer,BUFFER_SIZE,0);
if((stream = fopen("data","w+t"))==NULL)
{
printf("The file 'data' was not opened! n");
}
else
bzero(buffer,BUFFER_SIZE);
length = 0;
while( length = recv(client_socket,buffer,BUFFER_SIZE,0))
{
if(length < 0)
{
printf("Recieve Data From Server %s Failed!n", argv[1]);
break;
}
int write_length = fwrite(buffer,sizeof(char),length,stream);
if (write_length<length)
{
printf("File is Write Failedn");
break;
}
bzero(buffer,BUFFER_SIZE); 
}
printf("Recieve File From Server[%s] Finishedn", argv[1]);
//Close the file
fclose(stream);
//Close the socket
close(client_socket);
return 0;
}

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