Server Client application in c using TCP/IP protocol - c

Question

Hi, I am developing Server client between two different operating
systems. I am executing server on Ubuntu 14.04 & Client on Windows.
/* Simple Server code on TCP/IP protocol */
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <signal.h>
#include <ctype.h>
#include <arpa/inet.h>
#include <netdb.h>
#define length 512
void error(const char *msg)
{
perror(msg);
exit(1);
}
int main(int argc, char *argv[])
{
int sockfd, newsockfd, portno; //Declare variable for Socket and port
socklen_t clilen; //Client address and port no
char buffer[length]; //Buffer for message
struct sockaddr_in serv_addr, cli_addr; //Srtructure for server and Client address
int n; //Check whether listen,accept,read,write process done
FILE *fileptr; //File pointer
int datasize;
/* Check Portno. provided or not */
if (argc < 2) {
fprintf(stderr,"ERROR, no port provided\n");
exit(1);
}
/*Create socket*/
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr)); //Clear memory for Server address
portno = atoi(argv[1]); //Convert portno in to Integer from ASCII
/*Server address and all other details */
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
/*Bind socket*/
if (bind(sockfd, (struct sockaddr *) &serv_addr,
sizeof(serv_addr)) < 0)
error("ERROR on binding");
/*Listening to socket and waiting for users(max.5) */
listen(sockfd,5);
clilen = sizeof(cli_addr); //Size of Client address
/*Accept users*/
newsockfd= accept(sockfd,(struct sockaddr *) &cli_addr,&clilen);
if (newsockfd< 0)
error("ERROR on accept");
/*File operations */
char* fs_name = "/home/ankur/Desktop/RTSIM_Dump.csv";
fileptr=fopen(fs_name,"r"); //Open file
/*Write and Read operation to socket*/
bzero(buffer,length);
while((datasize = fread(buffer,sizeof(char),length,fileptr))>0)
{
if(send(newsockfd,buffer,datasize,0)<0)
{
fprintf(stderr, "ERROR: Failed to send file :%s (errno = %d)\n",fs_name,errno);
break;
}
bzero(buffer,length);
}
fclose(fileptr); //Close file
close(newsockfd); //Close to accept client
close(sockfd); //close socket
return 0;
}
//Client code:
------------------------------------------------------------------------------#define WIN32_LEAN_AND_MEAN
#define _WIN32_WINNT 0x0501
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
// Need to link with Ws2_32.lib, Mswsock.lib, and Advapi32.lib
#pragma comment (lib, "Ws2_32.lib")
#pragma comment (lib, "Mswsock.lib")
#pragma comment (lib, "AdvApi32.lib")
#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "2222"
int __cdecl main(int argc, char **argv)
{
WSADATA wsaData;
SOCKET ConnectSocket = INVALID_SOCKET;
struct addrinfo *result = NULL,
*ptr = NULL,
hints;
char sendbuf[DEFAULT_BUFLEN];
char recvbuf[DEFAULT_BUFLEN];
int iResult;
int recvbuflen;
FILE *fileptr;
// Validate the parameters
if (argc != 2) {
printf("usage: %s server-name\n", argv[0]);
return 1;
}
// Initialize Winsock
iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
if (iResult != 0) {
printf("WSAStartup failed with error: %d\n", iResult);
return 1;
}
ZeroMemory( &hints, sizeof(hints) );
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
// Resolve the server address and port
iResult = getaddrinfo(argv[1], DEFAULT_PORT, &hints, &result);
if ( iResult != 0 ) {
printf("getaddrinfo failed with error: %d\n", iResult);
WSACleanup();
return 1;
}
// Attempt to connect to an address until one succeeds
for(ptr=result; ptr != NULL ;ptr=ptr->ai_next) {
// Create a SOCKET for connecting to server
ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype,
ptr->ai_protocol);
if (ConnectSocket == INVALID_SOCKET) {
printf("socket failed with error: %ld\n", WSAGetLastError());
WSACleanup();
return 1;
}
// Connect to server.
iResult = connect( ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
if (iResult == SOCKET_ERROR) {
closesocket(ConnectSocket);
ConnectSocket = INVALID_SOCKET;
continue;
}
break;
}
freeaddrinfo(result);
if (ConnectSocket == INVALID_SOCKET) {
printf("Unable to connect to server!\n");
WSACleanup();
return 1;
}
//Receive file from Server and save it.
fileptr = fopen("/Desktop/RTSIM_Dump.csv","w");
if (fileptr == NULL)
{
printf("ERROR:Create/Open file");
exit(1);
}
int write_sz;
memset(recvbuf,0,DEFAULT_BUFLEN);
while((recvbuflen = recv(ConnectSocket,recvbuf,DEFAULT_BUFLEN,0))>0)
{
write_sz = fwrite(recvbuf,sizeof(char),recvbuflen,fileptr);
if(write_sz < recvbuflen)
{
printf("File write failed.\n");
}
memset(recvbuf,0,DEFAULT_BUFLEN);
if(recvbuflen == 0 || recvbuflen != 512)
{
break;
}
}
if(recvbuflen < 0)
{
printf("recv() timed out.\n");
}
// cleanup
fclose(fileptr);
closesocket(ConnectSocket);
WSACleanup();
return 0;
}
------------------------------------------------------------------------------ I am getting errno 104 on server (Ubuntu) & create/open file error on
Windows.
Thanks in advance!!!
I checked server client on Ubuntu , it works perfectly but when i
tried it with Windows client. It gives me error during execution.

Answer 1

fileptr = fopen("/Desktop/RTSIM_Dump.csv","w");
That is incorrect path for windows. More proper would be "\Desktop\RTSIM_Dump.csv". Note that the directories in the path must exist and have appropriate permissions.
Where do you get error 104 in server?