/********************************************************************************* File : bbirc.c* Author : ceeg* Created : Tue May 22 05:46:13 2007* Modified : Wed May 23 00:05:04 2007* Website : www.chrisgillis.net** === bbIRC is a barebonesIRC bot. I'll add stuff when I feel like it. My code* is probably crap and will destroy your PC so don't run it.** This program is free software; you can redistribute it and/or modify* it under the terms of the GNU General Public License as published by* the Free Software Foundation; either version 2 of the License, or* (at your option) any later version.** This program is distributed in the hope that it will be useful,* but WITHOUT ANY WARRANTY; without even the implied warranty of* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the* GNU General Public License for more details.** You should have received a copy of the GNU General Public License* along with this program; if not, write to the Free Software* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.********************************************************************************//* First things first, we must include all necessary header files * Note I have commented each line with the functions the header * provides access to *//* The only headers included that are related to sockets are inet.h * and socket.h */#include <stdio.h> /* printf() */#include <stdlib.h> /* atoi() */#include <string.h> /* we'll use some string funcs, also memset() */#include <arpa/inet.h> /* sockaddr_in, inet_addr() */#include <sys/socket.h> /* socket(), connect(), send(), recv() */#include <unistd.h> /* close() *//* I've defined a datatype called IrcConnection that will hold * all of the variables related to connecting to an IRC server * *** you will want to move this struct to its own file in your * own projects. */typedef struct { /* The socket our server will transmit data on */ int sock; /* The server address */ struct sockaddr_in ircServerAddr; /* The port we're going to connect on */ unsigned short ircServerPort; /* A pointer to char for storing the IP */ char *serverIp; /* A pointer to char for storing the bots nick */ char *nickname; /* A pointer to char for storing the channel to join */ char *channel;} IrcConnection;/* Next, we create all of our #define directives. */#define RECVBUFSIZE 512 /* The size alloted to the buffer we're going to use * for the recv() buffer */#define VERSION 0.1 /* Version number *//* Now we'll declare any functions we've written for the program */void DieWithError( char *errorMessage ); /* See DieWithError() */int SendUserNick( IrcConnection * ); /* See SendUserNick() */int Pong( IrcConnection *, char *match );/* See Pong() */int JoinChannel( IrcConnection * ); /* See JoinChannel() *//* Now we declare the main() funtion. It's here where our program will * loop until it is terminated. I've tried to cut the bot up into smaller * functions though it's possible I'll get lazy. */int main ( int argc, char *argv[] ){ /* Declare variables */ char recvBuf[RECVBUFSIZE]; unsigned short bytesRcvd = 0; char pongedOnce = 0; /* bot sent pong? */ char inChannel = 0; /* bot joined a channel? */ /* Create a pointer to IrcConnection */ IrcConnection con, *irc = &con; /* We need to check to see if the arguments provided to the * program are correct before we assign any values to IrcConnection */ if ( (argc < 4) || (argc > 5) ) { fprintf(stderr, "Usage: %s <Server IP> <Nick> <Channel> [port]\n", argv[0]); exit(1); } /* Now we need to see if the program has been given an explicit port * to use, as well as set some IrcConnection members to their values */ irc->serverIp = argv[1]; irc->nickname = argv[2]; irc->channel = argv[3]; if ( argc == 5 ) irc->ircServerPort = atoi(argv[4]); /* set port to specified */ else irc->ircServerPort = 6667; /* or use standard */ /* Oh boy, we get to initialize the socket! */ if ((irc->sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) DieWithError("Error: socket() failed."); /* Go ahead and initialize the ircServerAddr struct so we can connect * on the socket */ /* To my knowledge, it is required on some systems to zero the structure * Please correct me if i'm wrong/out of date on this */ memset(&(irc->ircServerAddr), 0, sizeof(irc->ircServerAddr)); /* internet address family */ irc->ircServerAddr.sin_family = AF_INET; /* server ip */ irc->ircServerAddr.sin_addr.s_addr = inet_addr(irc->serverIp); /* http://retran.com/beej/htonsman.html */ irc->ircServerAddr.sin_port = htons(irc->ircServerPort); /* It's about time we got to connect() right? */ if (connect(irc->sock, (struct sockaddr *) &(irc->ircServerAddr), sizeof(irc->ircServerAddr)) < 0) DieWithError("Error: connect() failed."); /* Well shoot, if it's gotten this far you're connected to an IRC server. * Not for long though ;) * We need to send a few strings to the server so it doesnt boot us off! * NICK <nickname> * USER nick nick nick :nick */ if (SendUserNick(irc) < 0) DieWithError("Error: SendUserNick() failed."); /* After you send a USER and a NICK you HAVE to start receiving. The server * will likely send a "PING :<string>" message and you MUST reply to it with * "PONG :<string>" where <string> == <string>, this is so the server can * remove dropped connections */ /* ============= Main Loop ============= */ while (1) /* repeat until terminated */ { char *match; if ((bytesRcvd = recv(irc->sock, recvBuf, RECVBUFSIZE-1, 0)) <= 0) DieWithError("recv failed\n"); recvBuf[bytesRcvd] = '\0'; printf(recvBuf); printf("\n"); /* We now effectively have a message stored in our recv buffer * It would be good if we could search it for PING * y hullo thar, string.h */ if ((match = strstr(recvBuf, "PING")) != NULL) { /* A pong message is in the format PONG :<string> * "PING :" is 6chars. match+6 is the start of the string we have * to reply back with. */ Pong( irc, match+6 ); printf("PONG!\n"); pongedOnce = 1; /* so we can join a channel (gotta send pong first) */ } if((pongedOnce == 1) && (inChannel == 0)) { JoinChannel(irc); inChannel++; } } return 0;}/* Just a quick note while you're in this section, it'd be better to write a * single function that sends a message to the server. I'll probably do that * ...sometime *//* DieWithError */void DieWithError( char *errorMsg ){ perror(errorMsg); exit(1);}/* SendUserNick * Takes a pointer to IrcConnection * sends messages to server to register NICK/USER * returns -1 if unsuccessful */int SendUserNick( IrcConnection *ircon ){ char *usnbuf = malloc(256); /* we need a buffer for sprint, so we * can format the string we'll send */ unsigned int bufLen; /* stores how wide usnbuf is */ sprintf(usnbuf, "USER %s . . :%s%f\r\nNICK %sr\r\n", ircon->nickname, ircon->nickname, VERSION, ircon->nickname); bufLen = strlen(usnbuf); if (send(ircon->sock, usnbuf, bufLen, 0) != bufLen) return -1; else return 0; }/* Pong * takes pointer to char n where n...'\0' is the PING string and * sends a pong reply to the server */int Pong( IrcConnection *ircon, char *match ){ char *buf = malloc(128); unsigned int bufLen; sprintf(buf, "PONG :%s", match); bufLen = strlen(buf); if (send(ircon->sock, buf, bufLen, 0) != bufLen) return -1; else return 0; }/* JoinChannel * joins the channel specified in the IrcConnection structure */int JoinChannel( IrcConnection *ircon ){ char *cbuf = malloc(128); unsigned int bufLen; sprintf(cbuf, "JOIN #%s", ircon->channel); bufLen = strlen(cbuf); if (send(ircon->sock, cbuf, bufLen, 0) != bufLen) return -1; else return 0; }