telnet.c

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

#define BUF_SIZE 100

int irc_connect(char* addr, int port)
{
	int sock = socket(AF_INET, SOCK_STREAM, 0);

	if (sock < 0)
	{
		perror("sock");
		exit(1);
	}

	struct sockaddr_in serv_addr;

	serv_addr.sin_family = PF_INET;
	serv_addr.sin_port = htons(port);
	inet_aton(addr, &serv_addr.sin_addr);
	memset(&(serv_addr.sin_zero), '\0', 8);

	int status = connect(sock, (struct sockaddr*)&serv_addr, sizeof(struct sockaddr));	

	if (status != -1)
	{
		struct sockaddr_in peer_addr;
		int sin_size = sizeof(struct sockaddr);
		getpeername(sock, (struct sockaddr*)&peer_addr, &sin_size);
	} else {
		perror("connect");
		exit(1);
	}

	return sock;
}

int main(int argc, char **argv)
{
	if (argc != 3)
	{
		printf("Usage: %s address port", argv[0]);
		exit(1);
	}

	char *addr = argv[1];
	int port = atoi(argv[2]);
	fd_set master;
	fd_set read_fds;
	struct timeval tv;
	int status;

	tv.tv_sec = 1;
	tv.tv_usec = 0;

	FD_ZERO(&master);
	FD_ZERO(&read_fds);

	int sock_fd = irc_connect("173.230.128.213", port);

	FD_SET(sock_fd, &master);
	FD_SET(0, &master);

	for (;;)
	{
		read_fds = master;
		status = select(sock_fd+1,&read_fds,NULL,NULL,&tv);
		if (status == -1) 
		{
			perror("select");
			exit(1);
		} 
		else if (status == 0)
		{
			tv.tv_sec = 1;
			tv.tv_usec = 0;
		}
		
		if (FD_ISSET(sock_fd, &read_fds))
		{
			char buf[BUF_SIZE];
			int bytes_received = recv(sock_fd, &buf, BUF_SIZE, 0);
			if (bytes_received == 0) {
				puts("Remote host closed connection");
				exit(1);
			}
			buf[bytes_received] = '\0';
			printf("%s", buf);
		}

		if (FD_ISSET(STDIN_FILENO, &read_fds))
		{
			ssize_t r;
			char buf[BUF_SIZE + 2];
			memset(&buf, 0, BUF_SIZE);

			r = read(STDIN_FILENO, buf, BUF_SIZE);

			if (buf[r-1] =  '\n')
			{
				buf[r-1] = '\r';
				buf[r] = '\n';
			}

			r = send(sock_fd, buf, r + 1, 0);
		}

		char buf[BUF_SIZE];
		int numbytes = 0;
	}
}

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