random-pathname.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include "arch.h"
   5 #include "log.h"
   6 #include "maps.h"
   7 #include "random.h"
   8 #include "sanitise.h"
   9
  10 const char * generate_pathname(void)
  11 {
  12         const char *pathname = get_filename();
  13         char *newpath;
  14         unsigned int len;
  15         unsigned int i;
  16
  17         if (pathname == NULL)           /* handle -n correctly. */
  18                 return NULL;
  19
  20         /* 90% chance of returning an unmangled filename */
  21         if ((rand() % 100) < 90)
  22                 return pathname;
  23
  24         /* Create a bogus filename. */
  25         newpath = malloc(page_size);    // FIXME: We leak this.
  26         if (newpath == NULL)
  27                 return pathname;        // give up.
  28
  29         len = strlen(pathname);
  30
  31         /* empty string. */
  32         if ((rand() % 100) == 0) {
  33                 memset(newpath, 0, page_size);
  34                 goto out;
  35         }
  36
  37         generate_random_page(newpath);
  38
  39         /* sometimes, just complete junk. */
  40         if (rand_bool())
  41                 goto out;
  42
  43         /* Sometimes, pathname + junk */
  44         if (rand_bool())
  45                 (void) strncpy(newpath, pathname, len);
  46         else {
  47                 /* make it look relative to cwd */
  48                 newpath[0] = '.';
  49                 newpath[1] = '/';
  50                 (void) strncpy(newpath + 2, pathname, len);
  51         }
  52
  53         /* Sometimes, remove all /'s */
  54         if (rand_bool()) {
  55                 for (i = 0; i < len; i++) {
  56                         if (newpath[i] == '/')
  57                                 newpath[i] = rand();
  58                 }
  59         }
  60 out:
  61         /* 50/50 chance of making it look like a dir */
  62         if (rand_bool()) {
  63                 newpath[len] = '/';
  64                 newpath[len + 1] = 0;
  65         }
  66
  67         return newpath;
  68 }