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Problem of the Week 1, What's up with compilers?
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| #include <string.h> | |
| #include <stdio.h> | |
| #include <stdint.h> | |
| int main() { | |
| uint32_t ip; | |
| scanf("%u", &ip); | |
| uint8_t octets[4]; | |
| memcpy(octets, &ip, sizeof(ip)); | |
| printf("%u.%u.%u.%u\n", octets[3], octets[2], octets[1], octets[0]); | |
| return 0; | |
| } | |
| ~ |
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| .text:0000000140001000 ; int __cdecl main() | |
| .text:0000000140001000 main proc near ; CODE XREF: __scrt_common_main_seh+118p | |
| .text:0000000140001000 ; DATA XREF: .pdata:ExceptionDiro | |
| .text:0000000140001000 | |
| .text:0000000140001000 var_28 = dword ptr -28h | |
| .text:0000000140001000 var_18 = dword ptr -18h | |
| .text:0000000140001000 var_10 = qword ptr -10h | |
| .text:0000000140001000 | |
| .text:0000000140001000 sub rsp, 48h | |
| .text:0000000140001004 mov rax, cs:__security_cookie | |
| .text:000000014000100B xor rax, rsp | |
| .text:000000014000100E mov [rsp+48h+var_10], rax | |
| .text:0000000140001013 lea rdx, [rsp+48h+var_18] | |
| .text:0000000140001018 lea rcx, _Format ; "%u" | |
| .text:000000014000101F call scanf | |
| .text:0000000140001024 mov edx, [rsp+48h+var_18] | |
| .text:0000000140001028 mov eax, edx | |
| .text:000000014000102A shr eax, 8 | |
| .text:000000014000102D movzx ecx, dl | |
| .text:0000000140001030 movzx r9d, al | |
| .text:0000000140001034 mov eax, edx | |
| .text:0000000140001036 shr eax, 10h | |
| .text:0000000140001039 mov [rsp+48h+var_28], ecx | |
| .text:000000014000103D lea rcx, aU_U_U_U ; "%u.%u.%u.%u\n" | |
| .text:0000000140001044 movzx r8d, al | |
| .text:0000000140001048 shr edx, 18h | |
| .text:000000014000104B call printf | |
| .text:0000000140001050 xor eax, eax | |
| .text:0000000140001052 mov rcx, [rsp+48h+var_10] | |
| .text:0000000140001057 xor rcx, rsp ; StackCookie | |
| .text:000000014000105A call __security_check_cookie | |
| .text:000000014000105F add rsp, 48h | |
| .text:0000000140001063 retn | |
| .text:0000000140001063 main endp |
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| #include <stdio.h> | |
| #include <stdint.h> | |
| int main() { | |
| uint32_t ip; | |
| scanf("%u", &ip); | |
| printf("%u.%u.%u.%u\n", (ip >> 24) & 0xFF, (ip >> 16) & 0xFF, (ip >> 8) & 0xFF, ip & 0xFF); | |
| return 0; | |
| } |
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| .text:0000000140001000 ; int __cdecl main() | |
| .text:0000000140001000 main proc near ; CODE XREF: __scrt_common_main_seh+118p | |
| .text:0000000140001000 ; DATA XREF: .pdata:ExceptionDiro | |
| .text:0000000140001000 | |
| .text:0000000140001000 var_28 = dword ptr -28h | |
| .text:0000000140001000 var_18 = dword ptr -18h | |
| .text:0000000140001000 var_10 = qword ptr -10h | |
| .text:0000000140001000 | |
| .text:0000000140001000 sub rsp, 48h | |
| .text:0000000140001004 mov rax, cs:__security_cookie | |
| .text:000000014000100B xor rax, rsp | |
| .text:000000014000100E mov [rsp+48h+var_10], rax | |
| .text:0000000140001013 lea rdx, [rsp+48h+var_18] | |
| .text:0000000140001018 lea rcx, _Format ; "%u" | |
| .text:000000014000101F call scanf | |
| .text:0000000140001024 mov edx, [rsp+48h+var_18] | |
| .text:0000000140001028 mov eax, edx | |
| .text:000000014000102A shr eax, 8 | |
| .text:000000014000102D movzx ecx, dl | |
| .text:0000000140001030 movzx r9d, al | |
| .text:0000000140001034 mov eax, edx | |
| .text:0000000140001036 shr eax, 10h | |
| .text:0000000140001039 mov [rsp+48h+var_28], ecx | |
| .text:000000014000103D lea rcx, aU_U_U_U ; "%u.%u.%u.%u\n" | |
| .text:0000000140001044 movzx r8d, al | |
| .text:0000000140001048 shr edx, 18h | |
| .text:000000014000104B call printf | |
| .text:0000000140001050 xor eax, eax | |
| .text:0000000140001052 mov rcx, [rsp+48h+var_10] | |
| .text:0000000140001057 xor rcx, rsp ; StackCookie | |
| .text:000000014000105A call __security_check_cookie | |
| .text:000000014000105F add rsp, 48h | |
| .text:0000000140001063 retn | |
| .text:0000000140001063 main endp |
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| #include <stdio.h> | |
| #include <stdint.h> | |
| int main() { | |
| typedef union { | |
| uint32_t ipWord; | |
| unsigned char octets[4]; | |
| } ip_t; | |
| ip_t ip; | |
| scanf("%u", &ip.ipWord); | |
| printf("%u.%u.%u.%u\n", ip.octets[3], ip.octets[2], ip.octets[1], ip.octets[0]); | |
| return 0; | |
| } |
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| .text:0000000140001000 ; int __cdecl main() | |
| .text:0000000140001000 main proc near ; CODE XREF: __scrt_common_main_seh+118p | |
| .text:0000000140001000 ; DATA XREF: .pdata:ExceptionDiro | |
| .text:0000000140001000 | |
| .text:0000000140001000 var_28 = dword ptr -28h | |
| .text:0000000140001000 var_18 = byte ptr -18h | |
| .text:0000000140001000 var_17 = byte ptr -17h | |
| .text:0000000140001000 var_16 = byte ptr -16h | |
| .text:0000000140001000 var_15 = byte ptr -15h | |
| .text:0000000140001000 var_10 = qword ptr -10h | |
| .text:0000000140001000 | |
| .text:0000000140001000 sub rsp, 48h | |
| .text:0000000140001004 mov rax, cs:__security_cookie | |
| .text:000000014000100B xor rax, rsp | |
| .text:000000014000100E mov [rsp+48h+var_10], rax | |
| .text:0000000140001013 lea rdx, [rsp+48h+var_18] | |
| .text:0000000140001018 lea rcx, _Format ; "%u" | |
| .text:000000014000101F call scanf | |
| .text:0000000140001024 movzx eax, [rsp+48h+var_18] | |
| .text:0000000140001029 lea rcx, aU_U_U_U ; "%u.%u.%u.%u\n" | |
| .text:0000000140001030 movzx r9d, [rsp+48h+var_17] | |
| .text:0000000140001036 movzx r8d, [rsp+48h+var_16] | |
| .text:000000014000103C movzx edx, [rsp+48h+var_15] | |
| .text:0000000140001041 mov [rsp+48h+var_28], eax | |
| .text:0000000140001045 call printf | |
| .text:000000014000104A xor eax, eax | |
| .text:000000014000104C mov rcx, [rsp+48h+var_10] | |
| .text:0000000140001051 xor rcx, rsp ; StackCookie | |
| .text:0000000140001054 call __security_check_cookie | |
| .text:0000000140001059 add rsp, 48h | |
| .text:000000014000105D retn | |
| .text:000000014000105D main endp |
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