Someone

//ftp-scan.c#include <stdio.h>#include <stdlib.h>#include <sys/param.h>#include <sys/socket.h>#include <netinet/in.h>#include <netdb.h>#include <stdarg.h>int sock;char line[1024];void rconnect(char *server){	struct sockaddr_in sin;	struct hostent *hp;	hp=gethostbyname(server);	if(hp==NULL) {		printf("Unknown host: $s\n",server);		exit(0);	}	bzero((char*) &sin,sizeof(sin));	bcopy(hp->h_addr,(char *) &sin.sin_addr,hp->h_length);	sin.sin_family=hp->hp_addrtype;	sin.sin_port=htons(21);	sock=socket(AF_INET,SOCK_STREAM,0);	connect(sock,(struct sockaddr *) &sin,sizeof(sin));}void login(void){	char buf[1024];	sprintf(buf,"USER ftp\n");	send(sock,buf,strlen(buf),0);	sleep(1);	sprintf(buf,"PASS user@\n");	send(sock,buf,strlen(buf),0);}void readln(void){	int i,done=0,w;	char tmp[1];	sprintf(line,"");	i=0;	while(!done) {		w=read(sock,tmp,1,0);		if(tmp[0]!=0) {			line[i]=tmp[0];		}		if(line[i]=='\n') {			done=1;		}		i++;	}	line[i]=0;}void sendln(char s[1024]) {	send(sock,s,strlen(s),0);}#define UC(b)   (((int)b)&0xff)void main(int argc,char **argv){	char buf[1024];	int i;	u_short sport,eport;	register char *p,*a;	struct hostent *hp;	struct sockaddr_in sin;	char adr[1024];	if(argc!=5) {		printf("usage: ftp-scan ftp_server scan_host loport hiport\n");		exit(-1);	}	hp=gethostbyname(argv[2]);	if(hp==NULL) {		printf("Unknown host: %s\n",argv[2]);		exit(0);	}	bzero((char*) &sin,sizeof(sin));	bcopy(hp->h_addr,(char *) &sin.sin_addr,hp->h_length);	rconnect(argv[1]);	/* Login anon to server */	login();	/* Make sure we are in */	for(i=0;i<200;i++) {		readln();		if(strstr(line,"230 Guest")) {			printf("%s",line);			i=200;		}	}}a=(char *)&sin.sin_addr;sport=atoi(argv[3]);eport=atoi(argv[4]);sprintf(adr,"%i,%i,%i,%i",UC(a[0]),UC(a[1]),UC(a[2]),UC(a[3]));for(i=sport;i<eport,i++) {	sin.sin_port=htons(i);	p=(char *)&sin.sin_port;	sprintf(buf,"\nPORT %s,%i,%i\nLIST\n",adr,UC(p[0]),UC(p[1]));	sendln(buf);	sprintf(line,"");	while(!strstr(line,"150") && !strstr(line,"425")) {		readln();	}	if(strstr(line,"150")) {		printf("%i connected.\n",i);	}	close(sock);}