simple_irc.c

simple_irc.c

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

#define PORT 6667

#define MAX_BUFF 4096
 
int main(int argc,char*argv[]) {
				int sockfd;
        int connected = 0; // Used to loop the program
 
        char* server; // network address

        char* nick = "NICK Somebot\r\n"; // NICK raw
        char* user = "USER Somebot 0 * :a c bot\r\n"; // USER raw
				char* join = "JOIN #gameshell\r\n";
				sockfd = -1;
 
        struct sockaddr_in addr;
        struct hostent *host; 

        if (argc != 2) {
						printf("default connect to localhost\n");
						server = "127.0.0.1";
        }else {
					server = argv[1];
				}

        if( (host = gethostbyname(server))==NULL) {
					herror("gethostbyname");
					exit(1);
				}

        /** Fill the members of the socket structs required to connect **/
 
        addr.sin_addr.s_addr = *(unsigned long*)host->h_addr;
        addr.sin_family = AF_INET;
        addr.sin_port = htons(PORT);
			
				
        if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1 ) {
					perror("socket");
					exit(1);
				}

        /** Connect to address **/
        if( connect(sockfd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) == -1) {
					perror("connect");exit(1);
				}
 
        printf("Connecting to: %s\n",server);
				
        send(sockfd,nick,strlen(nick), 0); // Converts nick string to c-array and sends it to server

        printf("Sent: %s to server\n",nick);

        send(sockfd, user, strlen(user), 0);
        printf("Sent: %s to server\n",user);
      	
				send(sockfd, join, strlen(join),0);
				printf("Sent: %s to server\n", join);
 
        char sockbuff[MAX_BUFF];
				int numbytes;
        while (connected < 1) {
								
                memset(&sockbuff, 0, sizeof(sockbuff));

                if( (numbytes = recv(sockfd, sockbuff, MAX_BUFF, 0)) == -1) {
									perror("recv");
									exit(1);
								}
								sockbuff[numbytes] = '\0';
                printf("%s",sockbuff);
        }
 				close(sockfd); 
        return 0;
}