IDA简易教程(8)

call _printf printf(\

switch(software->info.category) {

case DISASSEMBLY:

printf(\DISASSEMBLY\

break;

case RECOVERY:

printf(\RECOVERY\

break;

case CRYPTOGRAPHY:

printf(\CRYPTOGRAPHY\ break; } pop ecx

not_os_x:

lea edx, (asc_40A331 -

aWeDonTSellHardwareForThe)[esi] push edx ; format call _printf pop ecx

mov cl, byte ptr [ebx+software_t.info] shr ecx, 5

and ecx, category >> 5 dec ecx

jz short DISASSEMBLY dec ecx

jz short RECOVERY dec ecx

jz short CRYPTOGRAPHY jmp short end

; ------------------------------------------------------------

DISASSEMBLY:

lea eax, (aDisassembly - aWeDonTSellHardwareForThe)[esi] push eax ; format call _printf pop ecx

jmp short end

; ------------------------------------------------------------

RECOVERY:

lea edx, (aRecovery -

aWeDonTSellHardwareForThe)[esi] push edx ; format call _printf pop ecx

jmp short end

; ------------------------------------------------------------

CRYPTOGRAPHY:

printf(\ }

bool

print_product(product_t *product) {

if (! check_product( product->category))

lea ecx, (aCryptography - aWeDonTSellHardwareForThe)[esi] push ecx ; format call _printf pop ecx end:

lea eax, (asc_40A358 -

aWeDonTSellHardwareForThe)[esi] push eax ; format call _printf pop ecx pop esi pop ebx pop ebp retn

print_software endp

; ------------------------------------------------------------ align 4

; ||||||||||||||| S U B R O U T I N E ||||||||||||||||||||||||

; Attributes: bp-based frame

; int __cdecl print_product(product_t *product)

print_product proc near ; CODE XREF: main+128p

product= dword ptr 8

push ebp

mov ebp, esp push ebx

mov ebx, [ebp+product]

push [ebx+product_t.category] ; product_category

call check_product pop ecx

test eax, eax

return false;

printf(\\

product->id);

switch(product->category) {

case BOOK:

print_book(&product->p.book);

break;

case SOFTWARE:

print_software( &product->p.software); break; }

return true; } jnz short check_product_ok xor eax, eax pop ebx pop ebp retn

; ------------------------------------------------------------

check_product_ok: ; CODE XREF: print_product+12j

push [ebx+product_t.id]

push offset aProduct04x ; format call _printf add esp, 8

mov edx, [ebx+product_t.category] sub edx, 1

jb short case_book jz short case_software jmp short default

; ------------------------------------------------------------

case_book: ; CODE XREF: print_product+2Ej

add ebx, product_t.p.book.title push ebx ; book call print_book pop ecx

jmp short default

; ------------------------------------------------------------

case_software: ; CODE XREF: print_product+30j

add ebx, product_t.p.software.info push ebx ; software call print_software pop ecx

default: ; CODE XREF: print_product+32j ... mov al, 1 pop ebx

pop ebp retn

print_product endp

; ------------------------------------------------------------ align 4

; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||| ; Attributes: bp-based frame void main() { ; void __cdecl main() main proc near ; DATA XREF: .data:0040A0D0o push ebp mov ebp, esp push ebx push esi printf(\ push edi push offset aCustomers ; format customer_t *customer = call _printf customers; pop ecx mov ebx, offset customers jmp short loc_401376 ; ---------------------------------------- while (customer->id != -------------------- 0) { loop_print_customer: ; CODE XREF: main+25j print_customer(custom push ebx ; customer er); call print_customer pop ecx customer++; add ebx, 40 loc_401376: ; CODE XREF: main+16j cmp [ebx+customer_t.id], 0 } jnz short loop_print_customer product_t *products = push 544 ; size (product_t*) call _malloc malloc(PRODUCTS_COUNT pop ecx

* sizeof(product_t)); mov ebx, eax mov [ebx+product_t.id], 1

products[0].id = 1;

products[0].category = BOOK;

products[0].p.book = ida_book;

products[1].id = 2;

products[1].category = SOFTWARE;

products[1].p.software =

softwares.softs[0];

products[2].id = 3;

products[2].category = SOFTWARE;

products[2].p.software =

softwares.softs[1];

products[3].id = 4;

products[3].category = SOFTWARE;

products[3].p.software =

softwares.softs[2];

printf(\; xor eax, eax ; BOOK

mov [ebx+product_t.category], eax

mov esi, offset aIdaQuickstartG ; \QuickStart Guide\

lea edi, [ebx+product_t.p.book.title] mov ecx, 32 rep movsd

mov dword ptr [ebx+product_t[1].id], 2 mov dword ptr

[ebx+product_t[1].category], SOFTWARE mov esi, offset softwares.softs

lea edi, [ebx+product_t[1].p.software] mov ecx, 9 rep movsd

mov dword ptr [ebx+product_t[2].id], 3 mov dword ptr

[ebx+product_t[2].category], SOFTWARE mov esi, (offset

softwares.softs.info+24h)

lea edi, [ebx+product_t[2].p.software] mov ecx, 9 rep movsd

mov dword ptr [ebx+product_t[3].id], 4 mov dword ptr

[ebx+product_t[3].category], SOFTWARE mov esi, (offset

softwares.softs.info+48h)

lea edi, [ebx+product_t[3].p.software] mov ecx, 9 rep movsd

push offset aProducts ; format call _printf pop ecx

xor esi, esi

loop_verify_print_product: ; CODE XREF: main+132j

mov eax, esi shl eax, 4 add eax, esi

push [ebx+eax*8+product_t.category] ; product_category

call check_product

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