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Chat_NT117
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master
nick-kramer117 2023-02-15 09:09:50 -04:00
commit 4fb1542b48
3 changed files with 497 additions and 0 deletions
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6
Makefile 100644
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compile:
gcc -Wall -g3 -fsanitize=address -pthread server_NT117.c -o server_NT117
gcc -Wall -g3 -fsanitize=address -pthread client_NT117.c -o client_NT117
FLAGS = -L /lib64
LIBS = -lusb-1.0 -l pthread

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client_NT117.c 100644
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pthread.h>
#define LENGTH 2048
// Global variables
volatile sig_atomic_t flag = 0;
int sockfd = 0;
char name[32];
void str_overwrite_stdout()
{
printf("%s", "[>] ");
fflush(stdout);
}
void str_trim_lf (char* arr, int length)
{
int i;
for (i = 0; i < length; i++)
{
if (arr[i] == '\n')
{
arr[i] = '\0';
break;
}
}
}
void catch_ctrl_c_and_exit(int sig)
{
flag = 1;
}
void send_msg_handler()
{
char message[LENGTH] = {};
char buffer[LENGTH + 32] = {};
while(1)
{
str_overwrite_stdout();
fgets(message, LENGTH, stdin);
str_trim_lf(message, LENGTH);
if (strcmp(message, "exit") == 0)
{
break;
}
else
{
sprintf(buffer, "%s: %s\n", name, message);
send(sockfd, buffer, strlen(buffer), 0);
}
bzero(message, LENGTH);
bzero(buffer, LENGTH + 32);
}
catch_ctrl_c_and_exit(2);
}
void recv_msg_handler()
{
char message[LENGTH] = {};
while(1)
{
int receive = recv(sockfd, message, LENGTH, 0);
if(receive > 0)
{
printf("%s", message);
str_overwrite_stdout();
}
else if(receive == 0)
{
break;
}
else
{
// -1
}
memset(message, 0, sizeof(message));
}
}
int main(int argc, char **argv)
{
// Standard parameters
char *ip = "127.0.0.1";
int port = 10117;
char *pswd = "117";
if(argc == 4)
{
printf("[+] - Set User setting.\n");
ip = argv[1];
port = atoi(argv[2]);
pswd = argv[3];
}
else if(argc == 3)
{
printf("[+] - Set User setting.\n");
ip = argv[1];
port = atoi(argv[2]);
}
else if(argc == 2)
{
printf("[+] - Set User setting.\n");
ip = argv[1];
}
else if(argc > 4)
{
printf("[!] - Error ENTER KEY!\n");
return EXIT_FAILURE;
}
else
{
printf("[+] - Set default setting.\n");
}
printf("Server IP address: %s \n", ip);
printf("Server Port: %d \n", port);
printf("Server Password: %s \n", pswd);
signal(SIGINT, catch_ctrl_c_and_exit);
printf("[?] - Please enter your name: ");
fgets(name, 32, stdin);
str_trim_lf(name, strlen(name));
if(strlen(name) > 32 || strlen(name) < 2)
{
printf("[!] - Name must be less than 30 and more than 2 characters!\n");
return EXIT_FAILURE;
}
struct sockaddr_in server_addr;
/* Socket settings */
sockfd = socket(AF_INET, SOCK_STREAM, 0);
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = inet_addr(ip);
server_addr.sin_port = htons(port);
// Connect to Server
int err = connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr));
if(err == -1)
{
printf("[!] - ERROR: connect!\n");
return EXIT_FAILURE;
}
// Send name
send(sockfd, name, 32, 0);
printf("--=== WELCOME TO THE CHAT NT117 (Client)===--\n");
pthread_t send_msg_thread;
if(pthread_create(&send_msg_thread, NULL, (void *) send_msg_handler, NULL) != 0)
{
printf("[!] - ERROR: pthread!\n");
return EXIT_FAILURE;
}
pthread_t recv_msg_thread;
if(pthread_create(&recv_msg_thread, NULL, (void *) recv_msg_handler, NULL) != 0)
{
printf("[!] - ERROR: pthread!\n");
return EXIT_FAILURE;
}
while(1)
{
if(flag)
{
printf("[*] - Exit...\n");
break;
}
}
close(sockfd);
return EXIT_SUCCESS;
}

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server_NT117.c 100644
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#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <pthread.h>
#include <sys/types.h>
#include <signal.h>
#include <string.h>
#define MAX_CLIENTS 100
#define BUFFER_SZ 2048
static _Atomic unsigned int cli_count = 0;
static int uid = 10;
// Client structure
typedef struct
{
struct sockaddr_in address;
int sockfd;
int uid;
char name[32];
} client_t;
client_t *clients[MAX_CLIENTS];
pthread_mutex_t clients_mutex = PTHREAD_MUTEX_INITIALIZER;
void str_overwrite_stdout()
{
printf("\r%s", "> ");
fflush(stdout);
}
void str_trim_lf (char* arr, int length)
{
int i;
for (i = 0; i < length; i++)
{
if (arr[i] == '\n')
{
arr[i] = '\0';
break;
}
}
}
void print_client_addr(struct sockaddr_in addr)
{
printf("%d.%d.%d.%d",
addr.sin_addr.s_addr & 0xff,
(addr.sin_addr.s_addr & 0xff00) >> 8,
(addr.sin_addr.s_addr & 0xff0000) >> 16,
(addr.sin_addr.s_addr & 0xff000000) >> 24);
}
// Add clients to queue
void queue_add(client_t *cl)
{
pthread_mutex_lock(&clients_mutex);
for(int i=0; i < MAX_CLIENTS; ++i)
{
if(!clients[i])
{
clients[i] = cl;
break;
}
}
pthread_mutex_unlock(&clients_mutex);
}
// Remove clients to queue
void queue_remove(int uid)
{
pthread_mutex_lock(&clients_mutex);
for(int i=0; i < MAX_CLIENTS; ++i)
{
if(clients[i])
{
if(clients[i]->uid == uid)
{
clients[i] = NULL;
break;
}
}
}
pthread_mutex_unlock(&clients_mutex);
}
// Send message to all clients except sender
void send_message(char *s, int uid)
{
pthread_mutex_lock(&clients_mutex);
for(int i=0; i<MAX_CLIENTS; ++i)
{
if(clients[i])
{
if(clients[i]->uid != uid)
{
if(write(clients[i]->sockfd, s, strlen(s)) < 0)
{
perror("[!] - ERROR: write to descriptor failed");
break;
}
}
}
}
pthread_mutex_unlock(&clients_mutex);
}
// Handle all communication with the client
void *handle_client(void *arg)
{
char buff_out[BUFFER_SZ];
char name[32];
int leave_flag = 0;
cli_count++;
client_t *cli = (client_t *)arg;
// Name
if(recv(cli->sockfd, name, 32, 0) <= 0 || strlen(name) < 2 || strlen(name) >= 32-1)
{
printf("[!] - Didn't enter the name.\n");
leave_flag = 1;
}
else
{
strcpy(cli->name, name);
sprintf(buff_out, "%s has joined\n", cli->name);
printf("%s", buff_out);
send_message(buff_out, cli->uid);
}
bzero(buff_out, BUFFER_SZ);
while(1)
{
if (leave_flag)
{
break;
}
int receive = recv(cli->sockfd, buff_out, BUFFER_SZ, 0);
if (receive > 0)
{
if(strlen(buff_out) > 0)
{
send_message(buff_out, cli->uid);
str_trim_lf(buff_out, strlen(buff_out));
printf("%s -> %s\n", buff_out, cli->name);
}
}
else if (receive == 0 || strcmp(buff_out, "exit") == 0)
{
sprintf(buff_out, "%s has left\n", cli->name);
printf("%s", buff_out);
send_message(buff_out, cli->uid);
leave_flag = 1;
}
else
{
printf("[!] - ERROR: -1\n");
leave_flag = 1;
}
bzero(buff_out, BUFFER_SZ);
}
// Delete client from queue and yield thread
close(cli->sockfd);
queue_remove(cli->uid);
free(cli);
cli_count--;
pthread_detach(pthread_self());
return NULL;
}
int main(int argc, char **argv)
{
// Standard parameters
char *ip = "127.0.0.1";
int port = 10117;
char *pswd = "117";
if(argc == 4)
{
printf("[+] - Set Administrator setting.\n");
ip = argv[1];
port = atoi(argv[2]);
pswd = argv[3];
}
else if(argc == 3)
{
printf("[+] - Set Administrator setting.\n");
ip = argv[1];
port = atoi(argv[2]);
}
else if(argc == 2)
{
printf("[+] - Set Administrator setting.\n");
ip = argv[1];
}
else if(argc > 4)
{
printf("[!] - Error ENTER KEY!\n");
return EXIT_FAILURE;
}
else
{
printf("[+] - Set default setting.\n");
}
printf("Server IP address: %s \n", ip);
printf("Server Port: %d \n", port);
printf("Server Password: %s \n", pswd);
int option = 1;
int listenfd = 0, connfd = 0;
struct sockaddr_in serv_addr;
struct sockaddr_in cli_addr;
pthread_t tid;
// Socket settings
listenfd = socket(AF_INET, SOCK_STREAM, 0);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = inet_addr(ip);
serv_addr.sin_port = htons(port);
// Ignore pipe signals
signal(SIGPIPE, SIG_IGN);
if(setsockopt(listenfd, SOL_SOCKET,(SO_REUSEPORT | SO_REUSEADDR),(char*)&option,sizeof(option)) < 0)
{
perror("[!] - ERROR: setsockopt failed!");
return EXIT_FAILURE;
}
// Bind
if(bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) < 0)
{
perror("[!] - ERROR: Socket binding failed!");
return EXIT_FAILURE;
}
// Listen
if (listen(listenfd, 10) < 0)
{
perror("[!] - ERROR: Socket listening failed!");
return EXIT_FAILURE;
}
printf("--=== WELCOME TO THE CHAT NT117 (Server) ===--\n");
while(1)
{
socklen_t clilen = sizeof(cli_addr);
connfd = accept(listenfd, (struct sockaddr*)&cli_addr, &clilen);
// Check if max clients is reached
if((cli_count + 1) == MAX_CLIENTS)
{
printf("[?] - Max clients reached. Rejected: ");
print_client_addr(cli_addr);
printf(":%d\n", cli_addr.sin_port);
close(connfd);
continue;
}
// Client settings
client_t *cli = (client_t *)malloc(sizeof(client_t));
cli->address = cli_addr;
cli->sockfd = connfd;
cli->uid = uid++;
// Add client to the queue and fork thread
queue_add(cli);
pthread_create(&tid, NULL, &handle_client, (void*)cli);
// Reduce CPU usage
sleep(1);
}
return EXIT_SUCCESS;
}