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TCPserver.c
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TCPserver.c
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#include <stdio.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <pthread.h>
#include <arpa/inet.h>
#define PORT 8080
pthread_mutex_t lock;
pthread_t close_t;
struct client{
int index,sockfd,len,alive;
struct sockaddr_in clientaddr;
char client_name[1024];
};
struct client clients[1024];
pthread_t thread[1024];
int client_count=0;
// for ERRORs
void error (const char *buff)
{
perror(buff);
exit(1);
}
// close the server
void *endserver(void* sockfd)
{
char buff[1024];
while(1)
{
scanf("%s",buff);
if(strcmp(buff,"tata") == 0)
break;
}
int newsockfd = *((int *) sockfd);
close(newsockfd);
printf("SERVER IS DISCONNECTED\n");
exit(1);
}
// THE CHAT SYSTEM
void *chat( void *aboutcli)
{
// Implementing details about client
struct client* aboutclient = (struct client*) aboutcli;
int index = aboutclient->index;
int client_socket = aboutclient->sockfd;
aboutclient->alive = 1;
char name[128];
recv(client_socket,name,128, 0);
strcpy(aboutclient->client_name,name);
// Broadcast that Client joined the Chat
char joinmsg[2048];
snprintf(joinmsg, 2048, "%s IS CONNECTED TO US.\n", name);
printf("%s", joinmsg);
for (int i = 0; i < client_count; i++)
{
if (i != index && clients[i].alive != 0)
send(clients[i].sockfd, joinmsg, 2048, 0);
}
// ACTUAL CHAT SYSTEM
while(1)
{
char buff[1024];
char msg[2048];
int read = recv(client_socket,buff,1024,0);
buff[read] = '\0';
char output[1024];
if(strcmp(buff,"DISP") == 0)
{
pthread_mutex_lock(&lock); //lock the current thread
int l = 0;
for(int i = 0;i<client_count;i++)
{
if(clients[i].alive == 0) continue;
else if(i!=index)
l += snprintf(output + l,1024,"%s is on socket %d.\n",clients[i].client_name,clients[i].sockfd);
else
l += snprintf(output + l,1024,"(You)%s are on socket %d.\n",name,client_socket);
}
send(client_socket,output,1024,0);
pthread_mutex_unlock(&lock); //unlock the thread
continue;
}
if(strcmp(buff,"CHAT") == 0)
{
pthread_mutex_lock(&lock); // lock the current thread
bzero(buff, 1024); // clear the buffer
read = recv(client_socket,buff,1024,0);
buff[read] = '\0';
snprintf(msg, 2048, "%s: %s\n", name, buff);
for (int i = 0; i < client_count; i++)
{
if (i != index && clients[i].alive != 0)
send(clients[i].sockfd, msg, 2048, 0);
}
pthread_mutex_unlock(&lock); //unlock the thread
}
if(strcmp(buff, "tata") == 0 || read == 0) // Broadcast that client left
{
pthread_mutex_lock(&lock); //lock the thread
clients[index].alive = 0;
printf("%s HAS LEFT THE CHAT.\n", name);
snprintf(buff, 1024, "%s has left the room.\n", name);
for (int i = 0; i < client_count; i++)
{
if (i != index && clients[i].alive != 0)
send(clients[i].sockfd, buff, 1024, 0);
}
pthread_mutex_unlock(&lock); // unlock the thread
bzero(buff, 1024);
int *temp;
pthread_exit(temp); //terminate the corresponding thread
}
}
fprintf(stderr,"Here somehow");
return NULL;
}
// Driver function
int main()
{
int sockfd;
struct sockaddr_in servaddr; //Internet address
// socket create and verification
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd == -1)
{
printf("SOCKET CREATION FAILED \n");
exit(0);
}
else
printf("SOCKET IS CREATED\n");
bzero(&servaddr, sizeof(servaddr));
// assign IP, PORT
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(PORT);
// Binding newly created socket to given IP and verification
if ((bind(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr))) != 0)
{
printf("SOCKET BINDING IS FAILED\n");
exit(0);
}
else
printf("SOCKET IS BINDED: SERVER STARTED\n");
// Now server is ready to listen and verify
if ((listen(sockfd, 1024)) != 0)
{
printf("LISTENING IS FAILED\n");
exit(0);
}
else
printf("SERVER IS LISTENING\n");
// Checking if the server is to be closed
pthread_create(&close_t,NULL,endserver,(void *) &sockfd);
// Accept the data packet from client and verify
while(1)
{
//accept
clients[client_count].sockfd=accept(sockfd,(struct sockaddr*) &clients[client_count].clientaddr,&clients[client_count].len);
clients[client_count].index=client_count;
// create a thread for a connection
pthread_create(&thread[client_count],NULL,chat,(void *) &clients[client_count]);
client_count=client_count+1;
}
return 0;
}