cannot establish server client connection - error 10061 in c winsock - c

Question

I'm trying to run server client on my 2 computers in my local network at home.
The first computer is server and the second is client.
I have error 10061 when I'm trying to connect the server. ("error - connect failed. sockfd is 164, errno is 34, WSA is 10061").
error 10061 means -"connection refused. No connection could be made because the target machine actively refused it. This usually results from trying to connect to a service that is inactive on the foreign host — that is, one with no server application running."
I thought it might be firewall problem so I approved in my firewall the port Im using, but stil it doesnt work.
Also, both computer have the same IP(why is that?).
Here's my code:
server.c:
#include <sys/types.h>
#include <signal.h>
#include <fcntl.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <winsock2.h>
#include <windows.h>
#include <tchar.h>
int socketBind(int sockfd, int port){
struct sockaddr_in serv_addr;
ZeroMemory((char*) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(port);
if ( bind(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0 ){
// we can check errno for exact ERROR
printf("bind failed with errno %d\n",errno);fflush(NULL);
return ERROR;
}
if ( listen(sockfd, 100) == -1 ){
return ERROR;
}
return 1;
}
int main()
{
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2,2), &wsaData) == SOCKET_ERROR) {
printf ("Error initialising WSA.\n");
return -1;
}
int sockfd; // server's listening socket's descriptor id
int port = 4997;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
while ( sockfd < 0 ){ // ERROR
printf("Listener socket creation failed with:%d, errno is %d\n",sockfd,errno);fflush(NULL);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
}
if ( socketBind(sockfd, port) == ERROR ){
printf("Socket bind failed with errno=%d\n",errno);fflush(NULL);
close(sockfd);
return ERROR;
}
printf("Starting to listen to other USERS!\n");fflush(NULL);
struct sockaddr_in cli_addr;
int clilen = sizeof(cli_addr); // length of address
// accept() returns the socket that will be used for Control Connection with the accepted client
printf("*************Waiting for other USERS************\n");fflush(NULL);
int newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen);
int readLength;
char command[(128+1)];
while(1)
{
ZeroMemory(command, sizeof(command));
readLength = read(newsockfd, command, 128+1);
if(readLength <= 0)
{
continue;
}
if(readLength > 0)
{
printf(" here should be API's func to command %s", command);fflush(NULL);
}
else
{
close(sockfd);
close(newsockfd);
WSACleanup();
printf("Read failed with errno:%d\n",errno);fflush(NULL);
return ERROR;
}
}
close(sockfd);
close(newsockfd);
WSACleanup();
return 1;
}
client.c:
#include <sys/types.h>
#include <signal.h>
#include <fcntl.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <winsock2.h>
#include <windows.h>
#include <tchar.h>
int verifyWrite(int sockfd, char* command){
int size = strlen(command);
int i=0, x=0;
for(i=0;i<size;){
x = write(sockfd, command, size);
if(x < 0){
return ERROR;
}
if(x >= 0) {
i += x;
}
}
return 0;
}
int sendToAll(char* message, int sockfd)
{
if ( verifyWrite(sockfd, message) < 0 )
{
printf("error while sending message\n");fflush(NULL);
}
return 0;
}
int main()
{
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2,2), &wsaData) == SOCKET_ERROR) {
printf ("Error initialising WSA.\n");
return -1;
}
int port,sockfd;
struct sockaddr_in serv_addr;
sockfd = socket(AF_INET, SOCK_STREAM, 0); //creating control connection
while(sockfd < 0){
printf("error - sockfd = %d\n",sockfd);fflush(NULL);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
}
port = 4997;
ZeroMemory((char*)&serv_addr, sizeof(serv_addr));
serv_addr.sin_addr.s_addr = inet_addr("192.168.1.20");
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(port);
while(connect(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr)) < 0){
printf("error - connect failed. sockfd is %d, errno is %d, WSA is %d\n",sockfd,errno,WSAGetLastError());fflush(NULL);
}
printf("\n opened connection to %s\n", "192.168.1.20");fflush(NULL);
int i = 0;
while(i< 6)
{
sendToAll("just a message", sockfd);
i++;
}
WSACleanup();
return 0;
}

Answer 1

Your server is listening on port 4997, but your client is connecting to port 80 instead. You would have caught that if you had included the listening and connecting IP:Port pairs in your debug output to the console.