tcpserver.c
#include"stdio.h"
#include"stdlib.h"
#include"sys/types.h"
#include"sys/socket.h"
#include"string.h"
#include"netinet/in.h"
#include"pthread.h"
#define PORT 4444
#define BUF_SIZE 2000
#define CLADDR_LEN 100
void * receiveMessage(void * socket) {
int sockfd, ret;
char buffer[BUF_SIZE];
sockfd = (int) socket;
memset(buffer, 0, BUF_SIZE);
for (;;) {
ret = recvfrom(sockfd, buffer, BUF_SIZE, 0, NULL, NULL);
if (ret < 0) {
printf("Error receiving data!\n");
} else {
printf("client: ");
fputs(buffer, stdout);
//printf("\n");
}
}
}
void main() {
struct sockaddr_in addr, cl_addr;
int sockfd, len, ret, newsockfd;
char buffer[BUF_SIZE];
pid_t childpid;
char clientAddr[CLADDR_LEN];
pthread_t rThread;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
printf("Error creating socket!\n");
exit(1);
}
printf("Socket created...\n");
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = PORT;
ret = bind(sockfd, (struct sockaddr *) &addr, sizeof(addr));
if (ret < 0) {
printf("Error binding!\n");
exit(1);
}
printf("Binding done...\n");
printf("Waiting for a connection...\n");
listen(sockfd, 5);
len = sizeof(cl_addr);
newsockfd = accept(sockfd, (struct sockaddr *) &cl_addr, &len);
if (newsockfd < 0) {
printf("Error accepting connection!\n");
exit(1);
}
inet_ntop(AF_INET, &(cl_addr.sin_addr), clientAddr, CLADDR_LEN);
printf("Connection accepted from %s...\n", clientAddr);
memset(buffer, 0, BUF_SIZE);
printf("Enter your messages one by one and press return key!\n");
//creating a new thread for receiving messages from the client
ret = pthread_create(&rThread, NULL, receiveMessage, (void *) newsockfd);
if (ret) {
printf("ERROR: Return Code from pthread_create() is %d\n", ret);
exit(1);
}
while (fgets(buffer, BUF_SIZE, stdin) != NULL) {
ret = sendto(newsockfd, buffer, BUF_SIZE, 0, (struct sockaddr *) &cl_addr, len);
if (ret < 0) {
printf("Error sending data!\n");
exit(1);
}
}
close(newsockfd);
close(sockfd);
pthread_exit(NULL);
return;
}
tcpclient.c
#include"stdio.h"
#include"stdlib.h"
#include"sys/types.h"
#include"sys/socket.h"
#include"string.h"
#include"netinet/in.h"
#include"netdb.h"
#include"pthread.h"
#define PORT 4444
#define BUF_SIZE 2000
void * receiveMessage(void * socket) {
int sockfd, ret;
char buffer[BUF_SIZE];
sockfd = (int) socket;
memset(buffer, 0, BUF_SIZE);
for (;;) {
ret = recvfrom(sockfd, buffer, BUF_SIZE, 0, NULL, NULL);
if (ret < 0) {
printf("Error receiving data!\n");
} else {
printf("server: ");
fputs(buffer, stdout);
//printf("\n");
}
}
}
int main(int argc, char**argv) {
struct sockaddr_in addr, cl_addr;
int sockfd, ret;
char buffer[BUF_SIZE];
char * serverAddr;
pthread_t rThread;
if (argc < 2) {
printf("usage: client < ip address >\n");
exit(1);
}
serverAddr = argv[1];
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
printf("Error creating socket!\n");
exit(1);
}
printf("Socket created...\n");
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr(serverAddr);
addr.sin_port = PORT;
ret = connect(sockfd, (struct sockaddr *) &addr, sizeof(addr));
if (ret < 0) {
printf("Error connecting to the server!\n");
exit(1);
}
printf("Connected to the server...\n");
memset(buffer, 0, BUF_SIZE);
printf("Enter your messages one by one and press return key!\n");
//creating a new thread for receiving messages from the server
ret = pthread_create(&rThread, NULL, receiveMessage, (void *) sockfd);
if (ret) {
printf("ERROR: Return Code from pthread_create() is %d\n", ret);
exit(1);
}
while (fgets(buffer, BUF_SIZE, stdin) != NULL) {
ret = sendto(sockfd, buffer, BUF_SIZE, 0, (struct sockaddr *) &addr, sizeof(addr));
if (ret < 0) {
printf("Error sending data!\n\t-%s", buffer);
}
}
close(sockfd);
pthread_exit(NULL);
return 0;
}
(terminal 1)
gcc tcpserver.c -o server -pthread
./server
(terminal 2)
gcc tcpclient.c -o client -pthread
./client 192.168.0.4
NB: Here 192.168.0.4
is the IP address of the system where server code is running