#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(argc, char *argv[])
{
        char *nick    = "NICK nanobot\r\n"; //bot nick
        char *user    = "USER nano d d :nano\r\n"; //user
        char *channel = "JOIN #social\r\n"; //channel

        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);

if(connect(connection, (struct sockaddr *)&sin, sizeof(struct sockaddr)) == -1)
{
        perror("connect");
        exit(1);
}
send(connection, nick, sizeof(buf), 0);
send(connection, user, sizeof(buf), 0);
while(1)
{
        if ((numbytes = recv(connection, buf, MAXDATASIZE - 1, 0)) == -1)
        {
                perror("recv");
                exit(1);
        }

        if (strncmp("PING", buf, 4) == 0)
        {
                printf("Received PING... sending PONG\n");
                buf[1] = 'O';
                if(send(connection, buf, strlen(buf), 0) == -1)
                {
                        perror("send");
                        exit(1);
                }
        }
}