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<?php $QUERYSTRING = "test.eps"; do {$a = $QUERYSTRING; $QUERYSTRING = str_replace(array('..', '~', chr(0), ':', '?'), '', $QUERYSTRING); } while ($a != $QUERYSTRING); echo $QUERYSTRING . "\n"; if( (substr(strtolower($QUERYSTRING), -3) != ".ai") || (substr(strtolower($QUERYSTRING), -4) != ".eps")) { echo "not allowed"; } else { echo "allowed"; }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 44) Position 1 = 15, Position 2 = 1
Branch analysis from position: 15
2 jumps found. (Code = 47) Position 1 = 26, Position 2 = 35
Branch analysis from position: 26
2 jumps found. (Code = 43) Position 1 = 36, Position 2 = 38
Branch analysis from position: 36
1 jumps found. (Code = 42) Position 1 = 39
Branch analysis from position: 39
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 38
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 35
Branch analysis from position: 1
filename:       /in/paG6o
function name:  (null)
number of ops:  40
compiled vars:  !0 = $QUERYSTRING, !1 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'test.eps'
    5     1    >   ASSIGN                                                   !1, !0
          2        INIT_FCALL                                               'str_replace'
          3        INIT_ARRAY                                       ~4      '..'
          4        ADD_ARRAY_ELEMENT                                ~4      '%7E'
          5        ADD_ARRAY_ELEMENT                                ~4      '%00'
          6        ADD_ARRAY_ELEMENT                                ~4      '%3A'
          7        ADD_ARRAY_ELEMENT                                ~4      '%3F'
          8        SEND_VAL                                                 ~4
          9        SEND_VAL                                                 ''
         10        SEND_VAR                                                 !0
         11        DO_ICALL                                         $5      
         12        ASSIGN                                                   !0, $5
         13        IS_NOT_EQUAL                                             !1, !0
         14      > JMPNZ                                                    ~7, ->1
    7    15    >   CONCAT                                           ~8      !0, '%0A'
         16        ECHO                                                     ~8
    9    17        INIT_FCALL                                               'substr'
         18        INIT_FCALL                                               'strtolower'
         19        SEND_VAR                                                 !0
         20        DO_ICALL                                         $9      
         21        SEND_VAR                                                 $9
         22        SEND_VAL                                                 -3
         23        DO_ICALL                                         $10     
         24        IS_NOT_EQUAL                                     ~11     $10, '.ai'
         25      > JMPNZ_EX                                         ~11     ~11, ->35
         26    >   INIT_FCALL                                               'substr'
         27        INIT_FCALL                                               'strtolower'
         28        SEND_VAR                                                 !0
         29        DO_ICALL                                         $12     
         30        SEND_VAR                                                 $12
         31        SEND_VAL                                                 -4
         32        DO_ICALL                                         $13     
         33        IS_NOT_EQUAL                                     ~14     $13, '.eps'
         34        BOOL                                             ~11     ~14
         35    > > JMPZ                                                     ~11, ->38
   10    36    >   ECHO                                                     'not+allowed'
         37      > JMP                                                      ->39
   12    38    >   ECHO                                                     'allowed'
   13    39    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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