Miscellany

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

#define PORT 6667 //IRC port
#define MAXDATASIZE 512;

int main(int argc, char *argv[])
{
	if (argc != 2)
	{
		fprintf(stderr,"[-]Usage ircbot <serverip>\n");
	       exit(1);
	}
	int connection, numbytes;
	char buf[512];
	struct hostent *he;
	struct sockaddr_in sin;

	if ((he = gethostbyname(argv[1])) == NULL)
	{
		herror("gethostbyname");
		exit(1);
	}
	if ((connection = socket(PF_INET, SOCK_STREAM, 0)) == -1)
	{
		perror("socket");
		exit(1);
	}

	sin.sin_family 	  = AF_INET;
	sin.sin_port 	  = htons(PORT);
	sin.sin_addr      = *((struct in_addr *)he->h_addr);
	memset(&(sin.sin_zero), '\0', 8);
	
	if(connect(connection, (struct sockaddr *)&sin, sizeof(struct sockaddr)) == -1)
	{
		perror("connect");
		exit(1);
	}
	
	char *nick    = "NICK nanobot\r\n"; //bot nick
        char *user    = "USER nanobot nanobot nanobot :nanobot\r\n"; //user
	send(connection, nick, sizeof(buf), 0);
	send(connection, user, sizeof(buf), 0);
	
	while(1)
	{	
		recv(connection,buf,512,0);
		if (strncmp("PING", buf, 4) == 0)
		{
			printf("Received PING... sending PONG\n");
			buf[1] = 'O';
			send(connection, buf, strlen(buf), 0);
			printf("Received %s\n",connection);
		}
	}
	return 0;
}