| 1 | ; $Id: mytkExecPgm.asm,v 1.10 2000-02-23 16:53:04 bird Exp $ | 
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| 2 | ; | 
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| 3 | ; mytkExecPgm - tkExecPgm overload | 
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| 4 | ; | 
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| 5 | ; Copyright (c) 2000 knut st. osmundsen (knut.stange.osmundsen@pmsc.no) | 
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| 6 | ; | 
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| 7 | ; Project Odin Software License can be found in LICENSE.TXT | 
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| 8 | ; | 
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| 9 | .386p | 
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| 10 |  | 
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| 11 | ; | 
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| 12 | ;   Include files | 
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| 13 | ; | 
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| 14 | include devsegdf.inc | 
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| 15 |  | 
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| 16 | ; | 
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| 17 | ;   Imported Functions | 
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| 18 | ; | 
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| 19 | extrn  _g_tkExecPgm:PROC | 
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| 20 | extrn  AcquireBuffer:PROC | 
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| 21 | extrn  ReleaseBuffer:PROC | 
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| 22 | extrn  QueryBufferSegmentOffset:PROC | 
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| 23 |  | 
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| 24 | ; Scans strings until empy-string is reached. | 
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| 25 | ; input:  bx:di | 
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| 26 | ; uses:   nearly all (save bp) | 
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| 27 | ; return: cx size - CF clear | 
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| 28 | ;         ax error- CF set | 
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| 29 | extrn  _f_FuStrLenZ:PROC | 
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| 30 |  | 
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| 31 | ; Stringlength | 
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| 32 | ; input:  bx:di | 
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| 33 | ; uses:   nearly all (save bp) | 
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| 34 | ; return: cx size - CF clear | 
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| 35 | ;         ax error- CF set | 
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| 36 | extrn  _f_FuStrLen:PROC | 
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| 37 |  | 
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| 38 | ;memcpy | 
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| 39 | ;input:  bx:si pointer to source | 
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| 40 | ;        es:di pointer to target | 
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| 41 | ;        cx    count of bytes to copy | 
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| 42 | ;uses:   nearly all (save bp), es, ds | 
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| 43 | ;return: success CF clear | 
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| 44 | ;        failure CF set | 
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| 45 | extrn  _f_FuBuff:PROC | 
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| 46 |  | 
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| 47 | ; | 
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| 48 | ;   Exported symbols | 
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| 49 | ; | 
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| 50 | public mytkExecPgm | 
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| 51 |  | 
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| 52 |  | 
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| 53 |  | 
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| 54 | CODE32 SEGMENT | 
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| 55 |  | 
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| 56 | ;; | 
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| 57 | ; | 
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| 58 | ; @returns   same as tkExecPgm: eax, edx and carry flag | 
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| 59 | ; @param     ax     Exec flag | 
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| 60 | ;            ds:dx  Filename address. (String) | 
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| 61 | ;            es:bx  Environment address. (String) | 
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| 62 | ;            di:si  Argument address. (String) | 
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| 63 | ; @uses      all - bp | 
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| 64 | ; @sketch    Copy the filename and arguments into a buffer we | 
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| 65 | ;            may modify later if this is a UNIX shellscript or | 
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| 66 | ;            a PE-file started by pe.exe. | 
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| 67 | ; @status | 
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| 68 | ; @author    knut st. osmundsen (knut.stange.osmundsen@pmsc.no) | 
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| 69 | ; @remark | 
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| 70 | ; | 
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| 71 | ;   The buffer we are using is a C struct as follows. | 
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| 72 | ;   struct Buffer | 
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| 73 | ;   { | 
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| 74 | ;       char szFilename[261];  /* offset 0   */ | 
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| 75 | ;       char achArg[1536-261]; /* offset 261 */ | 
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| 76 | ;   }; | 
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| 77 | ; | 
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| 78 | mytkExecPgm PROC FAR | 
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| 79 | pBuffer     = dword ptr -04h | 
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| 80 | SegBuffer   = -08h | 
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| 81 | OffBuffer   = -0Ch | 
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| 82 | cchFilename = dword ptr -10h | 
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| 83 | cchArgs     = dword ptr -14h | 
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| 84 | ;usExecFlag  = -18h | 
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| 85 | ;SegFilename = -1ch | 
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| 86 | ;OffFilename = -1eh | 
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| 87 | ;SegEnv      = -20h | 
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| 88 | ;OffEnv      = -22h | 
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| 89 | ;SegArg      = -24h | 
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| 90 | ;OffArg      = -26h | 
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| 91 |  | 
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| 92 | ASSUME CS:CODE32, DS:NOTHING, SS:NOTHING | 
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| 93 | ;    int     3 | 
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| 94 | push    ebp | 
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| 95 | mov     ebp, esp | 
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| 96 | lea     esp, [ebp + cchArgs] | 
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| 97 |  | 
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| 98 | push    eax | 
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| 99 | push    ecx | 
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| 100 | push    ds | 
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| 101 | push    es | 
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| 102 | push    edi | 
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| 103 |  | 
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| 104 | ; parameter validations | 
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| 105 | mov     ax, ds                      ; pointer to filename | 
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| 106 | cmp     ax, 4 | 
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| 107 | jb      mytkExecPgm_CalltkExecPgm_X1 | 
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| 108 |  | 
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| 109 | ; | 
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| 110 | ; filename length | 
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| 111 | ; | 
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| 112 | mov     ax, ds | 
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| 113 | mov     es, ax | 
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| 114 | pushad | 
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| 115 | push    es | 
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| 116 | push    ds | 
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| 117 | mov     bx, ds | 
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| 118 | mov     di, dx                      ; es:di is now filename address (ds:dx). | 
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| 119 | push    cs                          ; Problem calling far into the calltab segement. | 
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| 120 | call    near ptr FLAT:_f_FuStrLen | 
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| 121 | movzx   ecx, cx | 
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| 122 | mov     [ebp+cchFilename], ecx | 
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| 123 | pop     ds | 
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| 124 | pop     es | 
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| 125 | popad | 
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| 126 | jc      mytkExecPgm_CalltkExecPgm_X1; If the FuStrLen call failed we bail out! | 
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| 127 |  | 
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| 128 | ; | 
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| 129 | ; if filename length is more that CCHMAXPATH then we don't do anything!. | 
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| 130 | ; | 
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| 131 | cmp     [ebp+cchFilename], 260 | 
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| 132 | jae     mytkExecPgm_CalltkExecPgm_X1; length >= 260 | 
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| 133 |  | 
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| 134 | ; | 
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| 135 | ; args length | 
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| 136 | ; Note: the arguments are a series of ASCIIZs ended by an empty string (ie. '\0'). | 
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| 137 | ; | 
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| 138 | pop     edi | 
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| 139 | push    edi | 
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| 140 | xor     ecx, ecx | 
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| 141 | cmp     di, 4                       ; The argument might me a invalid pointer... | 
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| 142 | jb      mytkExecPgm_CalltkExecPgm_1 | 
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| 143 |  | 
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| 144 | pushad | 
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| 145 | push    es | 
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| 146 | push    ds | 
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| 147 | mov     bx, di                      ; | 
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| 148 | mov     di, si                      ; bx:di -> arguments | 
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| 149 | push    cs                          ; Problem calling far into the calltab segement. | 
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| 150 | call    near ptr FLAT:_f_FuStrLenZ | 
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| 151 | movzx   ecx, cx | 
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| 152 | mov     [ebp+cchArgs], ecx | 
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| 153 | pop     ds | 
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| 154 | pop     es | 
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| 155 | popad | 
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| 156 | jc      mytkExecPgm_CalltkExecPgm_X1 | 
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| 157 |  | 
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| 158 | mytkExecPgm_CalltkExecPgm_1: | 
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| 159 | mov     ecx, [ebp+cchArgs] | 
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| 160 | add     ecx, [ebp+cchFilename]      ; filename | 
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| 161 | add     ecx, 3 + 260                ;  260 = new argument from a scrip file or something. | 
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| 162 | ;    3 = two '\0's and a space after added argument. | 
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| 163 | cmp     ecx, 1536                   ; 1536 = Buffersize.  FIXME! Define this!!! | 
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| 164 | jae     mytkExecPgm_CalltkExecPgm_X1; jmp if argument + file + new file > buffer size | 
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| 165 |  | 
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| 166 | ; | 
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| 167 | ; Aquire a buffer | 
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| 168 | ; | 
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| 169 | call    AcquireBuffer | 
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| 170 | or      eax, eax | 
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| 171 | jz      mytkExecPgm_CalltkExecPgm_X1; Failed to get buffer. | 
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| 172 | mov     [ebp+pBuffer], eax | 
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| 173 |  | 
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| 174 | ; | 
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| 175 | ; Get Segment and offset for the buffer | 
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| 176 | ; | 
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| 177 | call    QueryBufferSegmentOffset | 
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| 178 | mov     cx, es | 
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| 179 | mov     [ebp+OffBuffer], ax | 
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| 180 | mov     [ebp+SegBuffer], es | 
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| 181 | test    eax, 000570000h | 
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| 182 | jnz     mytkExecPgm_CalltkExecPgm_X2 | 
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| 183 |  | 
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| 184 | ; | 
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| 185 | ; Copy filename to pBuffer. | 
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| 186 | ; | 
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| 187 | pushad | 
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| 188 | push    es | 
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| 189 | push    ds | 
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| 190 | mov     di, ax                      ; es:di  pBuffer | 
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| 191 | mov     si, dx | 
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| 192 | mov     bx, ds                      ; bx:si  Filename pointer (input ds:dx) | 
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| 193 | mov     ecx, [ebp+cchFilename] | 
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| 194 | push    cs                          ; Problem calling far into the calltab segement. | 
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| 195 | call    near ptr FLAT:_f_FuBuff | 
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| 196 | pop     ds | 
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| 197 | pop     es | 
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| 198 | popad | 
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| 199 | jc      mytkExecPgm_CalltkExecPgm_X2 | 
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| 200 |  | 
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| 201 | ; | 
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| 202 | ; Copy Args to pBuffer + 261 | 
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| 203 | ; | 
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| 204 | ; stack: edi, es, ds, ecx, eax | 
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| 205 | pop     edi | 
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| 206 | push    edi | 
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| 207 | add     eax, 261                    ; we'll use eax in the branch | 
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| 208 | cmp     di, 4 | 
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| 209 | jb      mytkExecPgm_CalltkExecPgm_2 | 
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| 210 | pushad | 
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| 211 | push    es | 
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| 212 | push    ds | 
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| 213 | mov     ecx, [ebp+cchArgs] | 
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| 214 | mov     bx, di                      ; ds:si -> arguments | 
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| 215 | mov     di, ax                      ; es:di -> buffer + 261 | 
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| 216 | push    cs                          ; Problem calling far into the calltab segement. | 
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| 217 | call    near ptr FLAT:_f_FuBuff | 
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| 218 | pop     ds | 
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| 219 | pop     es | 
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| 220 | popad | 
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| 221 | jc      mytkExecPgm_CalltkExecPgm_X2 | 
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| 222 | jmp     mytkExecPgm_CalltkExecPgm_3 | 
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| 223 |  | 
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| 224 | mytkExecPgm_CalltkExecPgm_2: | 
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| 225 | mov     word ptr es:[eax], 0        ; Terminate the empty string! | 
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| 226 |  | 
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| 227 | ; | 
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| 228 | ; Restore variables pushed on the stack | 
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| 229 | ; | 
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| 230 | ; stack: edi, es, ds, ecx, eax | 
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| 231 | mytkExecPgm_CalltkExecPgm_3: | 
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| 232 | pop     edi | 
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| 233 | pop     es | 
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| 234 | pop     ds | 
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| 235 | pop     ecx | 
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| 236 | pop     eax | 
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| 237 |  | 
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| 238 | ; | 
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| 239 | ; Set new input parameters (call _g_tkExecPgm) | 
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| 240 | ; | 
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| 241 | ; ds:dx is to become SegBuffer:OffBuffer | 
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| 242 | ; di:si is to become SegBuffer:OffBuffer+261 | 
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| 243 | ; | 
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| 244 | ; The some of the old values are stored on the stack (for the time being) | 
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| 245 | push    ds | 
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| 246 | push    edi | 
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| 247 | push    esi | 
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| 248 |  | 
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| 249 | mov     di, [ebp+SegBuffer] | 
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| 250 | mov     ds, di | 
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| 251 | mov     si, [ebp+OffBuffer] | 
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| 252 | mov     dx, si                      ; ds:dx  SegBuffer:OffBuffer | 
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| 253 | add     si, 261                     ; di:si  SegBuffer:OffBuffer+261 | 
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| 254 |  | 
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| 255 | ; | 
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| 256 | ; Call _g_tkExecPgm | 
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| 257 | ; | 
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| 258 | push    cs                          ; Problem calling far into the calltab segement. | 
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| 259 | call    near ptr FLAT:_g_tkExecPgm | 
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| 260 | pushfd | 
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| 261 |  | 
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| 262 | ; | 
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| 263 | ; Release buffer | 
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| 264 | ; | 
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| 265 | push    eax | 
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| 266 | mov     eax, [ebp + pBuffer] | 
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| 267 | call    ReleaseBuffer | 
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| 268 | mov     [ebp + pBuffer], 0 | 
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| 269 | pop     eax | 
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| 270 |  | 
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| 271 | ; | 
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| 272 | ; Return | 
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| 273 | ; | 
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| 274 | popfd | 
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| 275 | pop     esi | 
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| 276 | pop     edi | 
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| 277 | pop     ds | 
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| 278 | leave | 
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| 279 | retf | 
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| 280 |  | 
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| 281 | mytkExecPgm_CalltkExecPgm_X2: | 
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| 282 | ; | 
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| 283 | ; Release buffer | 
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| 284 | ; | 
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| 285 | mov     eax, [ebp + pBuffer] | 
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| 286 | call    ReleaseBuffer | 
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| 287 | mov     [ebp + pBuffer], 0 | 
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| 288 |  | 
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| 289 | mytkExecPgm_CalltkExecPgm_X1: | 
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| 290 | pop     edi | 
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| 291 | pop     es | 
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| 292 | pop     ds | 
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| 293 | pop     ecx | 
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| 294 | pop     eax | 
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| 295 |  | 
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| 296 | mytkExecPgm_CalltkExecPgm: | 
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| 297 | push    cs | 
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| 298 | call    near ptr FLAT:_g_tkExecPgm | 
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| 299 | leave | 
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| 300 | retf | 
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| 301 | mytkExecPgm ENDP | 
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| 302 |  | 
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| 303 |  | 
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| 304 |  | 
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| 305 | CODE32 ENDS | 
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| 306 |  | 
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| 307 | if 0 ; alternate implementation. | 
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| 308 | mytkExecPgm PROC FAR | 
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| 309 | pBuffer     = dword ptr -04h | 
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| 310 | SegBuffer   = -08h | 
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| 311 | OffBuffer   = -0Ch | 
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| 312 | cchFilename = -10h | 
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| 313 | cchArgs     = -14h | 
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| 314 | usExecFlag  = -18h | 
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| 315 | SegFilename = -1ch | 
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| 316 | OffFilename = -1eh | 
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| 317 | SegEnv      = -20h | 
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| 318 | OffEnv      = -22h | 
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| 319 | SegArg      = -24h | 
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| 320 | OffArg      = -26h | 
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| 321 |  | 
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| 322 | ASSUME CS:CODE32, DS:NOTHING, SS:NOTHING | 
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| 323 | push    ebp | 
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| 324 | mov     ebp, esp | 
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| 325 | lea     esp, [ebp + OffArg] | 
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| 326 |  | 
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| 327 | ; save input parameters | 
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| 328 | mov     [ebp + usExecFlag], ax | 
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| 329 | mov     ax, es | 
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| 330 | mov     [ebp + SegEnv], ax | 
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| 331 | mov     [ebp + OffEnv], bx | 
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| 332 | mov     [ebp + SegArg], di | 
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| 333 | mov     [ebp + OffArg], si | 
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| 334 | mov     ax, ds | 
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| 335 | mov     [ebp + SegFilename], ax | 
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| 336 | mov     [ebp + OffFilename], dx | 
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| 337 |  | 
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| 338 | ; parameter validations | 
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| 339 | cmp     ax, 4                       ; pointer to filename | 
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| 340 | jb      mytkExecPgm_CalltkExecPgm_X1 | 
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| 341 |  | 
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| 342 | ; | 
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| 343 | ; filename length | 
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| 344 | ; | 
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| 345 | mov     bx, ax | 
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| 346 | mov     di, dx                      ; bx:di is now filename address | 
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| 347 | push    cs                          ; Problem calling far into the calltab segement. | 
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| 348 | call    near ptr FLAT:_f_FuStrLen | 
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| 349 | jc      mytkExecPgm_CalltkExecPgm_X1; If the FuStrLen call failed we bail out! | 
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| 350 |  | 
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| 351 | ; | 
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| 352 | ; if filename length is more that CCHMAXPATH then we don't do anything!. | 
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| 353 | ; | 
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| 354 | cmp     cx, 260 | 
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| 355 | jae     mytkExecPgm_CalltkExecPgm_X1; length >= 260 | 
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| 356 | mov     [ebp+cchFilename], cx | 
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| 357 |  | 
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| 358 | ; | 
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| 359 | ; args length | 
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| 360 | ; Note: the arguments are a series of ASCIIZs ended by an empty string (ie. '\0'). | 
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| 361 | ; | 
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| 362 | mov     bx, [ebp+SegArg] | 
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| 363 | cmp     bx, 4                       ; The argument might me an NULL pointer | 
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| 364 | xor     cx, cx | 
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| 365 | jb      mytkExecPgm_CalltkExecPgm_1 | 
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| 366 |  | 
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| 367 | mov     di, [ebp+OffArg]            ; bx:di -> arguments | 
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| 368 | push    cs                          ; Problem calling far into the calltab segement. | 
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| 369 | call    near ptr FLAT:_f_FuStrLenZ | 
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| 370 | mov     [ebp+cchArgs], cx | 
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| 371 | jc      mytkExecPgm_CalltkExecPgm_X1 | 
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| 372 |  | 
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| 373 | mytkExecPgm_CalltkExecPgm_1: | 
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| 374 | add     cx, [ebp+cchFilename]       ; filename length | 
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| 375 | add     cx, 3 + 260                 ;  260 = new argument from a scrip file or something. | 
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| 376 | ;    3 = two '\0's and a space after added argument. | 
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| 377 | cmp     ecx, 1536                   ; 1536 = Buffersize.  FIXME! Define this!!! | 
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| 378 | jae     mytkExecPgm_CalltkExecPgm_X1; jmp if argument + file + new file > buffer size | 
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| 379 |  | 
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| 380 | ; | 
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| 381 | ; Aquire a buffer | 
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| 382 | ; | 
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| 383 | call    AcquireBuffer | 
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| 384 | mov     [ebp+pBuffer], eax | 
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| 385 | or      eax, eax | 
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| 386 | jz      mytkExecPgm_CalltkExecPgm_X1; Failed to get buffer. | 
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| 387 |  | 
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| 388 | ; | 
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| 389 | ; Get Segment and offset for the buffer | 
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| 390 | ; | 
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| 391 | call    QueryBufferSegmentOffset | 
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| 392 | mov     cx, es | 
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| 393 | mov     [ebp+OffBuffer], ax | 
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| 394 | mov     [ebp+SegBuffer], es | 
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| 395 | test    eax, 000570000h | 
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| 396 | jnz     mytkExecPgm_CalltkExecPgm_X2 | 
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| 397 |  | 
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| 398 | ; | 
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| 399 | ; Copy filename to pBuffer. | 
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| 400 | ; | 
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| 401 | mov     di, ax                      ; es:di  pBuffer | 
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| 402 | mov     si, dx | 
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| 403 | mov     bx, ds                      ; bx:si  Filename pointer (input ds:dx) | 
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| 404 | mov     cx, [ebp+cchFilename]       ; cx = length of area to copy | 
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| 405 | push    cs                          ; Problem calling far into the calltab segement. | 
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| 406 | call    near ptr FLAT:_f_FuBuff | 
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| 407 | jc      mytkExecPgm_CalltkExecPgm_X2 | 
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| 408 |  | 
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| 409 | ; | 
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| 410 | ; Copy Args to pBuffer + 261 | 
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| 411 | ; | 
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| 412 | mov     si, [ebp+SegArg] | 
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| 413 | cmp     si, 4 | 
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| 414 | jb      mytkExecPgm_CalltkExecPgm_2 | 
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| 415 | mov     ds, si | 
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| 416 | mov     si, [ebp+OffArg]            ; ds:si -> arguments | 
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| 417 | mov     di, [ebp+SegBuffer] | 
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| 418 | mov     es, di | 
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| 419 | mov     di, [ebp+OffBuffer] | 
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| 420 | add     di, 261                     ; es:di -> buffer + 261 | 
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| 421 | mov     cx, [ebp+cchArgs]           ; cx = length of area to copy | 
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| 422 | push    cs                          ; Problem calling far into the calltab segement. | 
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| 423 | call    near ptr FLAT:_f_FuBuff | 
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| 424 | jc      mytkExecPgm_CalltkExecPgm_X2 | 
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| 425 | jmp     mytkExecPgm_CalltkExecPgm_3 | 
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| 426 |  | 
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| 427 | mytkExecPgm_CalltkExecPgm_2: | 
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| 428 | mov     word ptr es:[eax], 0        ; Terminate the empty string! | 
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| 429 |  | 
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| 430 | ; | 
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| 431 | ; Set new input parameters (call _g_tkExecPgm) | 
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| 432 | ; | 
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| 433 | ; ds:dx is to become SegBuffer:OffBuffer | 
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| 434 | ; di:si is to become SegBuffer:OffBuffer+261 | 
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| 435 | ; | 
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| 436 | mytkExecPgm_CalltkExecPgm_3: | 
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| 437 | mov     di, [ebp+SegBuffer] | 
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| 438 | mov     ds, di | 
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| 439 | mov     si, [ebp+OffBuffer] | 
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| 440 | mov     dx, si                      ; ds:dx  SegBuffer:OffBuffer | 
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| 441 | add     si, 261                     ; di:si  SegBuffer:OffBuffer+261 | 
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| 442 | mov     bx, [ebp+SegEnv] | 
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| 443 | mov     es, bx | 
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| 444 | mov     bx, [ebp+SegEnv] | 
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| 445 |  | 
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| 446 | ; | 
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| 447 | ; Call _g_tkExecPgm | 
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| 448 | ; | 
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| 449 | push    cs                          ; Problem calling far into the calltab segement. | 
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| 450 | call    near ptr FLAT:_g_tkExecPgm | 
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| 451 | pushfd | 
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| 452 |  | 
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| 453 | ; | 
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| 454 | ; Release buffer | 
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| 455 | ; | 
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| 456 | push    eax | 
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| 457 | mov     eax, [ebp + pBuffer] | 
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| 458 | call    ReleaseBuffer | 
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| 459 | mov     [ebp + pBuffer], 0 | 
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| 460 | pop     eax | 
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| 461 |  | 
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| 462 | ; | 
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| 463 | ; Return | 
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| 464 | ; | 
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| 465 | push    [ebp + SegFilename] | 
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| 466 | pop     ds | 
|---|
| 467 | push    [ebp + SegEnv] | 
|---|
| 468 | pop     es | 
|---|
| 469 | popfd | 
|---|
| 470 | leave | 
|---|
| 471 | retf | 
|---|
| 472 |  | 
|---|
| 473 | mytkExecPgm_CalltkExecPgm_X2: | 
|---|
| 474 | ; | 
|---|
| 475 | ; Release buffer | 
|---|
| 476 | ; | 
|---|
| 477 | mov     eax, [ebp + pBuffer] | 
|---|
| 478 | call    ReleaseBuffer | 
|---|
| 479 | mov     [ebp + pBuffer], 0 | 
|---|
| 480 |  | 
|---|
| 481 | mytkExecPgm_CalltkExecPgm_X1: | 
|---|
| 482 | pop     ds | 
|---|
| 483 |  | 
|---|
| 484 | mytkExecPgm_CalltkExecPgm: | 
|---|
| 485 | push    cs | 
|---|
| 486 | call    near ptr FLAT:_g_tkExecPgm | 
|---|
| 487 | leave | 
|---|
| 488 | retf | 
|---|
| 489 | mytkExecPgm ENDP | 
|---|
| 490 |  | 
|---|
| 491 | CODE32 ENDS | 
|---|
| 492 | endif | 
|---|
| 493 |  | 
|---|
| 494 |  | 
|---|
| 495 | END | 
|---|
| 496 |  | 
|---|