xtreme client v.543

[Nikos Mavroyanopoulos]

/* x-treme client for Linux
 * Ενα quick hack του παλιού xtreme client, για να δουλευει με τα
 * sources που μου έστειλε ο m0bius (mobius at groovy.gr)
 * Την string() την έφτιαξε ο phoenix (phoenix at iname.com)
 *
 * Φαινεται πως προχωρήσαν πιο γρήγορα απο εμένα...
 * δεν είναι και ο καλύτερος C κώδικας, αλλά who really cares:)
 */
 
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <unistd.h>


#define LISTENQ 1024
#define SA struct sockaddr
#define SERV_PORT 6699

/* #define NO_STDOUT */
/* #define NO_STDERR */
int string(char *username, char* tr);

int main(int koko, char** kaka)
{
	char c;
	int listenfd, connfd, clifd, i, strln;
	socklen_t len;
	unsigned char buff;
	struct sockaddr_in cliaddr, servaddr, xtreme_addr;
	char topbuff[512];
	char *xstr;
	char *USERNAME;
	
	if (koko!=2) {
		fprintf(stderr, "Usage: ./a.out username\n");
		exit(1);
	}
	
	USERNAME=kaka[1];
	xstr=malloc(strlen(USERNAME)*2+54);
	
	if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
		perror("socket");
		return -1;
	}
	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servaddr.sin_port = htons(SERV_PORT);

	if (bind(listenfd, (SA *) & servaddr, sizeof(servaddr)) < 0) {
		fprintf(stderr,
			"Probably a TIME_WAIT state. Retry later.\n");
		perror("bind");
		return -1;
	}
	if (listen(listenfd, LISTENQ) < 0) {
		perror("listen");
		return -1;
	}
	len = sizeof(cliaddr);

	for (;;) {
		if ((connfd = accept(listenfd, (SA *) & cliaddr, &len)) <
		    0) {
			perror("accept");
			return -1;
		}
#ifndef NO_STDERR
		fprintf(stderr, "connection from %s, port %d\n",
			inet_ntop(AF_INET, &cliaddr.sin_addr, topbuff,
				  sizeof(topbuff)),
			ntohs(cliaddr.sin_port));
#endif

		strln = string(USERNAME, xstr);
#ifndef NO_STDERR
		fprintf(stderr, "String(%d) was sent.\n", strln);
#endif

		write(connfd, xstr, strln);

		close(connfd);


#ifndef NO_STDERR
		fprintf(stderr, "connection terminated\n");
		fflush(stderr);
#endif
	}
	free(xstr);
}


int string(char *name, char* tr)
{

	char replies[3][54] = {
	            "\x00\x00\x00\x00\x00\x71\x00\x38\x00\x3f\x00\x3a\x00\x33"
		    "\x00\x3d\x00\x48\x00\x23\x00\x4e\x00\x4a\x00\x48\x00\x3b"
		    "\x00\x43\x00\x3b\x00\x23\x62\x26\x00\x26\x00\x26\x00\x2b"
		    "\x00\x23\x00\x47\x00\x31\x00\x4b\x00\x44\x00\x33",	//AUTH
			"\x41\x43\x4b",	// ACK
			"\x41\x43\x4b"
	};	// ACK

	int repliesn[3] = { 54, 3, 3 };
	int moufa;
	int usrlen;
	
	if (strlen(name) > 666) {
		exit(-1);
	}

	usrlen = strlen(name);
	
	srand((unsigned int) time(NULL));

	for (moufa = 0; moufa < (repliesn[0]); moufa++) {
		if ((tr[moufa] = replies[0][moufa]) == 0x00) {
			tr[moufa] =
			    (char) (1 +
				    (254.0 * rand() / (RAND_MAX + 1.0)));
		}
	}				

	for (;moufa < repliesn[0]+(usrlen*2);moufa++) {
		tr[moufa] = (char) (1 +
			    	(254.0 * rand() / (RAND_MAX + 1.0)));	
	}
	
	for (moufa=1; moufa < (usrlen * 2) ; moufa += 2) {
		tr[moufa+ repliesn[0]] = name[moufa / 2] - 10;
	}
	if (usrlen > 4) {
		tr[3] = 0x33;
		tr[4] = 0x2a + usrlen;
	} else {
		tr[3] = 0x32;
		tr[4] = 0x34 + usrlen;
	}

	return (repliesn[0]+(usrlen*2));
	
}

-- 
Nikos Mavroyanopoulos
mailto:nmav at hellug.gr
Always remember you're unique - just like everyone else.
--
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