forked from Francesco149/nolibc-httpd
-
Notifications
You must be signed in to change notification settings - Fork 0
/
httpd.asm
270 lines (249 loc) · 6.83 KB
/
httpd.asm
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
; - code disassembled from C executable with `objconv -fnasm httpd temp.asm`
; - tweaked by prepending _start to _001 and removing the exit call
; - tiny elf header see http://muppetlabs.com/~breadbox/software/tiny/teensy.html
BITS 64
org 0x08048000
ehdr: ; Elf32_Ehdr
db 0x7F, "ELF", 2, 1, 1, 0 ; e_ident
?_033:
db "usage: ", 0
dw 2 ; e_type
dw 62 ; e_machine
dd 1 ; e_version
dq _start ; e_entry
dq phdr - $$ ; e_phoff
?_034:
db " port fi" ; e_shoff
db "le", 10, 0 ; e_flags
dw ehdrsize ; e_ehsize
dw phdrsize ; e_phentsize
phdr: ; Elf32_Phdr
dd 1 ; e_phnum ; p_type
; e_shentsize
dd 5 ; e_shnum ; p_flags
; e_shstrndx
ehdrsize equ $ - ehdr
dq 0 ; p_offset
dq $$ ; p_vaddr
dq $$ ; p_paddr
dq filesize ; p_filesz
dq filesize ; p_memsz
dq 0x1000 ; p_align
phdrsize equ $ - phdr
_start:
xor rbp, rbp
xor r11, r11
pop rdi
mov rsi, rsp
?_001:
push r14
push r13
push r12
mov r12, rsi
push rbp
push rbx
sub rsp, 8224
cmp edi, 3
jnz ?_004
mov rcx, qword [rsi+8H]
xor eax, eax
?_002: movsx dx, byte [rcx]
test dl, dl
jz ?_003
lea esi, [rdx-30H]
cmp sil, 9
ja ?_004
imul eax, eax, 10
inc rcx
lea eax, [rax+rdx-30H]
jmp ?_002
?_003: mov edx, eax
xchg dl, dh
test ax, ax
jnz ?_007
?_004: mov rbx, qword [r12]
mov edx, 7
mov edi, 1
lea rsi, [rel ?_033]
call ?_027
mov rdx, rbx
?_005: cmp byte [rdx], 0
jz ?_006
inc rdx
jmp ?_005
?_006: sub edx, ebx
mov rsi, rbx
mov edi, 1
call ?_027
mov edx, 11
mov edi, 1
lea rsi, [rel ?_034]
call ?_027
mov edi, 1
call ?_018
xor edx, edx
?_007: mov word [rsp+12H], dx
xor eax, eax
xor ecx, ecx
lea rsi, [rsp+0CH]
lea rdi, [rsp+10H]
mov edx, 4
mov qword [rsp+14H], rax
mov dword [rsp+0CH], 1
mov dword [rsp+1CH], ecx
mov word [rsp+10H], 2
call ?_029
mov r13d, eax
?_008: xor ecx, ecx
xor esi, esi
or edi, 0FFFFFFFFH
mov edx, 1
call ?_017
test eax, eax
jg ?_008
xor edx, edx
xor esi, esi
mov edi, r13d
call ?_023
mov ebx, eax
test eax, eax
js ?_015
xor eax, eax
call ?_019
mov ebp, eax
test eax, eax
jne ?_015
mov r13, qword [r12+10H]
lea r12, [rsp+20H]
?_009: mov edx, 8192
mov rsi, r12
mov edi, ebx
call ?_028
mov r14d, eax
test eax, eax
jle ?_010
mov edx, r14d
mov rsi, r12
mov edi, 1
call ?_027
lea edx, [r14-3H]
movsxd rdx, edx
add rdx, r12
cmp r14d, 2
jg ?_011
?_010: mov rdi, r13
xor esi, esi
call ?_026
mov r13d, eax
test eax, eax
jns ?_012
mov edx, 39
lea rsi, [rel ?_035]
mov edi, ebx
call ?_027
jmp ?_014
?_011: cmp byte [rdx], 10
jnz ?_009
cmp byte [rdx+1H], 13
jnz ?_009
cmp byte [rdx+2H], 10
jnz ?_009
jmp ?_010
?_012: mov edx, 19
lea rsi, [rel ?_036]
mov edi, ebx
call ?_027
?_013: mov edx, 8192
mov rsi, r12
mov edi, r13d
call ?_028
mov edx, eax
test eax, eax
jle ?_016
mov rsi, r12
mov edi, ebx
call ?_027
test eax, eax
jns ?_013
?_014: mov ebp, 1
jmp ?_016
?_015: mov edi, ebx
call ?_025
jmp ?_008
?_016:
add rsp, 8224
mov eax, ebp
pop rbx
pop rbp
pop r12
pop r13
pop r14
ret
?_017:
add r11, 1
?_018: add r11, 3
?_019: add r11, 3
?_020: add r11, 4
?_021: add r11, 1
?_022: add r11, 6
?_023: add r11, 2
?_024: add r11, 38
?_025: add r11, 1
?_026: add r11, 1
?_027: add r11, 1
?_028: mov r10, rcx
mov rax, r11
syscall
xor r11, r11
ret
?_029:
push r12
mov r12, rsi
mov esi, 1
push rbp
mov rbp, rdi
mov edi, 2
push rbx
sub rsp, 16
mov dword [rsp+0CH], edx
mov edx, 6
call ?_024
mov r8d, dword [rsp+0CH]
test eax, eax
mov ebx, eax
jns ?_031
?_030: mov edi, 1
call ?_018
jmp ?_032
?_031: mov rcx, r12
mov edx, 2
mov esi, 1
mov edi, eax
call ?_020
test eax, eax
jnz ?_030
mov edx, 16
mov rsi, rbp
mov edi, ebx
call ?_022
test eax, eax
jnz ?_030
mov esi, 10
mov edi, ebx
call ?_021
test eax, eax
jnz ?_030
?_032: add rsp, 16
mov eax, ebx
pop rbx
pop rbp
pop r12
ret
?_035:
db "HTTP/1.1 404 Not Found"
db 0DH, 0AH, 0DH, 0AH
db "404 Not Found", 0
?_036:
db "HTTP/1.1 200 OK"
db 0DH, 0AH, 0DH, 0AH, 0
filesize equ $ - $$