Code:
Tcp Client
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdlib.h>
#include <stdio.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 6505
int __cdecl main(int argc, char **argv)
{
WSADATA wsaData;
SOCKET ConnectSocket = INVALID_SOCKET;
struct addrinfo *result = NULL,
*ptr = NULL,
hints;
//int n=10;;
//while (n>0) {
char string [6505];
char *sendbuf = "This_is_a_test_This_is_a_test_This_is_a_test_";
int n;
for (n=0; n<100; n++)
{
memcpy (string+(n*65),sendbuf,strlen(sendbuf));
}
string [n*65]='\0';
printf ("\n string: %s\n",string);
//--n;
//}
char recvbuf[DEFAULT_BUFLEN];
int iResult;
int recvbuflen = DEFAULT_BUFLEN;
// Validate the parameters
if (argc != 3) {
printf("usage: %s Please provide server-name & port no.\n", argv[0]);
return 1;
}
printf("\nAddress: %s, Port %s\n\n",argv[1],argv[2]);
// 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], argv[2], &hints, &result);
/*iResult = getaddrinfo("192.168.4.1", "12345", &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;
}
// Send an initial buffer
// for (int i=0; n<100; n++){
iResult = send( ConnectSocket, string, (int) strlen(string), 0 );
//printf("\nThis is a test\n");
// printf("\nMessage Sended: %s\n",sendbuf);
if (iResult == SOCKET_ERROR) {
printf("send failed with error: %d\n", WSAGetLastError());
closesocket(ConnectSocket);
WSACleanup();
return 1;
}
printf("Bytes Sent: %ld\n", iResult);
printf("\n\n Receiving Echo data !!\n\n");
// Receive until the peer closes the connection
ZeroMemory(recvbuf,6501);
iResult = recv(ConnectSocket, recvbuf, 6500, 0);
if ( iResult > 0 ) {
printf("\nBytes received: %d\n\n", iResult);
printf("%s\n",recvbuf);
}
else if ( iResult == 0 )
printf("\nConnection closed\n");
else
printf("recv failed with error: %d\n", WSAGetLastError());
// shutdown the connection since no more data will be sent
iResult = shutdown(ConnectSocket, SD_SEND);
if (iResult == SOCKET_ERROR) {
printf("shutdown failed with error: %d\n", WSAGetLastError());
closesocket(ConnectSocket);
WSACleanup();
return 1;
}
// cleanup
closesocket(ConnectSocket);
WSACleanup();
//}
return 0;
}
TCP Server
/* A simple server in the internet domain using TCP
The port number is passed as an argument */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
void error(const char *msg)
{
perror(msg);
exit(1);
}
int main(int argc, char *argv[])
{
int sockfd, newsockfd, portno;
socklen_t clilen;
char buffer[6502];
struct sockaddr_in serv_addr, cli_addr;
int n;
//int m =1;
if (argc < 2) {
fprintf(stderr,"ERROR, no port provided\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr,
sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd,5);
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd,
(struct sockaddr *) &cli_addr,
&clilen);
if (newsockfd < 0)
error("ERROR on accept");
//while (m>0)
//{
bzero(buffer,6502);
n = recv(newsockfd,buffer,6500,MSG_WAITALL);
if (n < 0)
//{
error("ERROR reading from socket");
//break ;
//}
// to print the sended message
printf("Message Received: %s\n",buffer);
printf("\nBytes Received: %ld\n",n);
n = write(newsockfd,buffer,n);
printf("\n\n Echoing data !!\n\n");
printf("\nBytes sended: %ld\n",n);
if (n < 0)
//{
error("ERROR writing to socket");
//break ;
//}
// }
shutdown(newsockfd, SHUT_RD);
shutdown(newsockfd, SHUT_WR);
shutdown(newsockfd, SHUT_RDWR);
close(newsockfd);
close(sockfd);
return 0;
}
