tcp-ip 소켓통신 채팅프로그램 소스코드

client.c  소스코드

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <pthread.h>

#define BUF_SIZE 100
#define NAME_SIZE 20

void *send_msg(void * arg);
void *recv_msg(void * arg);
void error_handling(char *msg);

char name[NAME_SIZE] = "[DEFAULT]";
char msg[BUF_SIZE];

int main(int argc, char *argv[])
{
	int sock;
	struct sockaddr_in serv_addr;
	pthread_t snd_thread, rcv_thread;
	void * thread_return;
	if(argc!=4) {
		printf("Usage : %s <IP> <port> <name>\n", argv[0]);
		exit(1);
	}

	sprintf(name, "[%s]", argv[3]);
	sock=socket(PF_INET, SOCK_STREAM, 0);

	memset(&serv_addr, 0, sizeof(serv_addr));
	serv_addr.sin_family=AF_INET; 
	serv_addr.sin_addr.s_addr=inet_addr(argv[1]);
	serv_addr.sin_port=htons(atoi(argv[2]));

	if(connect(sock, (struct sockaddr*) &serv_addr, sizeof(serv_addr))==-1)
		error_handling("connect() error");

	pthread_create(&snd_thread, NULL, send_msg, (void*)&sock);
	pthread_create(&rcv_thread, NULL, recv_msg, (void*)&sock);
	pthread_join(snd_thread, &thread_return);
	pthread_join(rcv_thread, &thread_return);
	close(sock);
	return 0;
}

void * send_msg(void * arg)
{
	int sock = *((int*)arg);
	char name_msg[NAME_SIZE+BUF_SIZE];
	while(1)
	{
		fgets(msg, BUF_SIZE, stdin);
		if(!strcmp(msg, "q\n")||!strcmp(msg, "Q\n"))
		{
			close(sock);
			exit(0);
		}
		sprintf(name_msg, "%s %s", name, msg);
		write(sock, name_msg, strlen(name_msg));
	}
	return NULL;
}
void * recv_msg(void * arg)
{
	int sock = *((int*)arg);
	char name_msg[NAME_SIZE+BUF_SIZE];
	int str_len;
	while(1)
	{
		str_len = read(sock, name_msg, NAME_SIZE+BUF_SIZE-1);
		if(str_len ==-1)
			return (void*)-1;
		name_msg[str_len] =0;
		fputs(name_msg, stdout);
	}
	return NULL;
}

void error_handling(char *msg)
{
	fputs(msg,stderr);
	fputc('\n',stderr);
	exit(1);
}

 

server.c  소스코드

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <pthread.h>

#define BUF_SIZE 100
#define MAX_CLNT 256

void * handle_clnt(void * arg);
void send_msg(char * msg, int len);
void error_handling(char * msg);

int clnt_cnt=0;
int clnt_socks[MAX_CLNT];
pthread_mutex_t mutx;

int main(int argc, char *argv[])
{
	int serv_sock, clnt_sock;
	struct sockaddr_in serv_adr, clnt_adr;
	int clnt_adr_sz;
	pthread_t t_id;
	if(argc!=2) {
		printf("Usage : %s <port>\n", argv[0]);
		exit(1);
	}
  
	pthread_mutex_init(&mutx, NULL);
	serv_sock=socket(PF_INET, SOCK_STREAM, 0);

	memset(&serv_adr, 0, sizeof(serv_adr));
	serv_adr.sin_family=AF_INET; 
	serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
	serv_adr.sin_port=htons(atoi(argv[1]));
	
	if(bind(serv_sock, (struct sockaddr*) &serv_adr, sizeof(serv_adr))==-1)
		error_handling("bind() error");
	if(listen(serv_sock, 5)==-1)
		error_handling("listen() error");
	
	while(1)
	{
		clnt_adr_sz=sizeof(clnt_adr);
		clnt_sock=accept(serv_sock, (struct sockaddr*)&clnt_adr,&clnt_adr_sz);
		
		pthread_mutex_lock(&mutx);
		clnt_socks[clnt_cnt++]=clnt_sock;
		pthread_mutex_unlock(&mutx);
	
		pthread_create(&t_id, NULL, handle_clnt, (void*)&clnt_sock);
		pthread_detach(t_id);
		printf("Connected client IP: %s \n", inet_ntoa(clnt_adr.sin_addr));
	}
	close(serv_sock);
	return 0;
}
	
void * handle_clnt(void * arg)
{
	int clnt_sock=*((int*)arg);
	int str_len=0, i;
	char msg[BUF_SIZE];
	
	while((str_len=read(clnt_sock, msg, sizeof(msg)))!=0)
		send_msg(msg, str_len);
	
	pthread_mutex_lock(&mutx);
	for(i=0; i<clnt_cnt; i++)   // remove disconnected client
	{
		if(clnt_sock==clnt_socks[i])
		{
			while(i++<clnt_cnt-1)
				clnt_socks[i]=clnt_socks[i+1];
			break;
		}
	}
	clnt_cnt--;
	pthread_mutex_unlock(&mutx);
	close(clnt_sock);
	return NULL;
}
void send_msg(char * msg, int len)   // send to all
{
	int i;
	pthread_mutex_lock(&mutx);
	for(i=0; i<clnt_cnt; i++)
		write(clnt_socks[i], msg, len);
	pthread_mutex_unlock(&mutx);
}
void error_handling(char * msg)
{
	fputs(msg, stderr);
	fputc('\n', stderr);
	exit(1);
}

 

리눅스 기반에서 실행을 해봣으며, 위의 두가지 파일을 만들어 주고

컴파일을 해주면 된다.

컴파일 방법

gcc server.c -o server

- server.c라는 파일을 컴파일 하여 server라는 실행파일을 만들어준다.

그다음 실행

./server 9190

 

서버를 실행해 줫으니 클라이언트를 실행해준다.

서버와 방법은 동일하다.

gcc client.c -o client

./client 127.0.0.1 9190