/* URDLS: unreadable directory lister -- v2. *********************************
 * urdls.c/urdls[revision2], (alphanumeric) unreadable directory lister.     *
 * for listing files in directories without having permission to do so.      *
 * this program goes in a round-up (with 09-AZ-az) fashion, so it supports   *
 * start and stop points. (argument 3)                                       *
 *                                                                           *
 * by: vade79 -> v9[v9@realhalo.org] -> www.fakehalo.org.                    *
 *****************************************************************************/
#include <stdio.h>
#include <pwd.h>
#include <grp.h>
#include <signal.h>
#include <sys/stat.h>
#define MAX_DIRECTORY_LEN 4095		/* maximum directory length.	*/
#define MAX_FILENAME_LEN 255		/* maximum filename length.	*/
#define MAX_ID_ENTRY_LEN 1024		/* maximum id entry length.	*/
char file[MAX_FILENAME_LEN+1];
char path[MAX_DIRECTORY_LEN+1];
char fullpath[sizeof(path)+sizeof(file)];
char owner_u[MAX_ID_ENTRY_LEN];
char owner_g[MAX_ID_ENTRY_LEN];
void quit(){
 fprintf(stderr,"finished run of: %s (stopped at: %s)\n",path,file);
 exit(0);
}
main(int argc,char **argv){
 int i=0;
 int j=1;
 int s=0;
 int cpudelay=0;
 char setid[5];
 char filetype[5];
 struct stat mod;
 struct passwd *user;
 struct group *group;
 fprintf(stderr,"[ unreadable directory file lister, by v9[v9@realhalo.org]. ]"
 "\n");
 if(argc>1){
  if(strlen(argv[1])>MAX_DIRECTORY_LEN){
   fprintf(stderr,"%s: argument 1 is too large.\n",argv[0]);
   exit(1);
  }
  strncpy(path,argv[1],MAX_DIRECTORY_LEN);
  if(path[strlen(path)-1]!=(char)0x2F)
   sprintf(path,"%s/",path);
  if(stat(path,&mod)||!S_ISDIR(mod.st_mode)){
   fprintf(stderr,"%s: argument 1 is an invalid directory.\n",argv[0]);
   exit(1);
  }
 }
 else{
  fprintf(stderr,"usage: %s <directory> [cpu delay(usecs)] [start value]\n",
  argv[0]);
  exit(0);
 }
 if(argc>2){
  if(atoi(argv[2])<0){
   fprintf(stderr,"%s: argument 2 must be equal or greater than zero.\n",
   argv[0]);
   exit(1);
  }
  else
   cpudelay=atoi(argv[2]);
 }
 if(argc>3){
  if(strlen(argv[3])>MAX_FILENAME_LEN){
   fprintf(stderr,"%s: argument 3 is too large.\n",argv[0]);
   exit(1);
  }
  else{
   strcpy(file,argv[3]);
   for(i=0;strlen(file)>i;i++)
    if(!isalnum(file[i])){
     fprintf(stderr,"%s: argument 3 has non-alphanumeric character(s).\n",
     argv[0]);
     exit(1);
    }
  }
 }
 else
  file[0]=0x2F;
 signal(SIGINT,quit);
 fprintf(stderr,"[ directory: %s, delay(usecs): %d, start value: %s. ]\n",path,
 cpudelay,file[0]==(char)0x2F?"new session":file);
 fprintf(stderr,"num%cowner%cgroup%cprivs%csize%ctype%cfilename\n",0x9,0x9,0x9,
 0x9,0x9,0x9);
 while(1){
  file[strlen(file)-1]++;
  for(i=strlen(file);(i+1);i--){
   if(file[i]>=(char)0x7B){
    if(i){
     file[i]=0x30;
     file[i-1]++;
    }
    else{
     if(strlen(file)>=MAX_FILENAME_LEN){
      fprintf(stderr,"finished run of: %s\n",path);
      exit(0);
     }
     else{
      file[0]=0x30;
      sprintf(file,"%c%s",0x30,file);
     }
    }
   }
   if(file[i]==(char)0x5B)
    file[i]=0x61;
   if(file[i]==(char)0x3A)
    file[i]=0x41;
  }
  snprintf(fullpath,sizeof(fullpath),"%s%s",path,file);
  if(!stat(fullpath,&mod)){
   if(!(user=getpwuid(mod.st_uid)))
    sprintf(owner_u,"%u",mod.st_uid);
   else{
    if(user->pw_name)
     strncpy(owner_u,user->pw_name,MAX_ID_ENTRY_LEN);
    else
     sprintf(owner_u,"%u",user->pw_uid);
   }
   if(!(group=getgrgid(mod.st_gid)))
    sprintf(owner_g,"%u",mod.st_gid);
   else{
    if(group->gr_name)
     strncpy(owner_g,group->gr_name,MAX_ID_ENTRY_LEN);
    else
     sprintf(owner_g,"%u",group->gr_gid);
   }
   sprintf(setid,"none");
   if(S_ISUID&mod.st_mode)
    sprintf(setid,"SUID");
   if(S_ISGID&mod.st_mode){
    if(S_ISUID&mod.st_mode)
     sprintf(setid,"S*ID");
    else
     sprintf(setid,"SGID");
   }
   if(S_ISREG(mod.st_mode))
    sprintf(filetype,"file");
   else if(S_ISLNK(mod.st_mode))
    sprintf(filetype,"link");
   else if(S_ISDIR(mod.st_mode))
    sprintf(filetype,"dir");
   else if(S_ISCHR(mod.st_mode))
    sprintf(filetype,"cdev");
   else if(S_ISBLK(mod.st_mode))
    sprintf(filetype,"bdev");
   else if(S_ISFIFO(mod.st_mode))
    sprintf(filetype,"fifo");
   else if(S_ISSOCK(mod.st_mode))
    sprintf(filetype,"sock");
   fprintf(stderr,"#%d%c%s%c%s%c%s%c%dkb%c%s%c%s\n",j++,0x9,owner_u,0x9,
   owner_g,0x9,setid,0x9,(mod.st_size/1024),0x9,filetype,0x9,file);
  }
  if(cpudelay)
   usleep(cpudelay);
 }
}