#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int /*<<< orphan*/ printf(char *, ...);
void usage(char *name) {
  printf("\nPort Knocking Backdoor - client\n\n");
  printf("Usage:\n\n");
  printf("%s [required] [optional]\n\n", name);
  printf("[required]:\n");
  printf("\t -d <dest_ip>\t\tdestination ip\n");
  printf("\n");
  printf("[optional]:\n");
  printf("\t -p <port>\t\tport connect to\n");
  printf("\t\t\t\t(default port: %d)\n", 3493);
  printf("\t -i <interface>\t\tinterface to use\n");
  printf("\t\t\t\t(default interface: %s)\n", "lo");
  printf("\n\n");
}


x86 assembly (clang, -O0):
<usage>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
lea    0xedd(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xef2(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%rsi
lea    0xee9(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xef6(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xef5(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xebd(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xef9(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xef8(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xf08(%rip),%rdi
mov    $0xda5,%esi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xf0d(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xf23(%rip),%rdi
lea    0xf39(%rip),%rsi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xe5c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<usage>:
push   %rbx
mov    %rdi,%rbx
lea    0xf18(%rip),%rdi
call   1040 <puts@plt>
lea    0xf2e(%rip),%rdi
call   1040 <puts@plt>
lea    0xead(%rip),%rdi
mov    %rbx,%rsi
xor    %eax,%eax
call   1050 <printf@plt>
lea    0xf19(%rip),%rdi
call   1040 <puts@plt>
lea    0xf19(%rip),%rdi
call   1040 <puts@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
lea    0xf22(%rip),%rdi
call   1040 <puts@plt>
lea    0xf22(%rip),%rdi
call   1040 <puts@plt>
lea    0xe7d(%rip),%rdi
mov    $0xda5,%esi
xor    %eax,%eax
call   1050 <printf@plt>
lea    0xf20(%rip),%rdi
call   1040 <puts@plt>
lea    0xe76(%rip),%rdi
lea    0xe8c(%rip),%rsi
xor    %eax,%eax
call   1050 <printf@plt>
lea    0xe47(%rip),%rdi
pop    %rbx
jmp    1040 <puts@plt>

LLVM IR (-O0):
@.str = [35 x i8] c"\0APort Knocking Backdoor - client\0A\0A\00"
@.str.1 = [9 x i8] c"Usage:\0A\0A\00"
@.str.2 = [27 x i8] c"%s [required] [optional]\0A\0A\00"
@.str.3 = [13 x i8] c"[required]:\0A\00"
@.str.4 = [32 x i8] c"\09 -d <dest_ip>\09\09destination ip\0A\00"
@.str.5 = [2 x i8] c"\0A\00"
@.str.6 = [13 x i8] c"[optional]:\0A\00"
@.str.7 = [30 x i8] c"\09 -p <port>\09\09port connect to\0A\00"
@.str.8 = [24 x i8] c"\09\09\09\09(default port: %d)\0A\00"
@.str.9 = [36 x i8] c"\09 -i <interface>\09\09interface to use\0A\00"
@.str.10 = [29 x i8] c"\09\09\09\09(default interface: %s)\0A\00"
@.str.11 = [3 x i8] c"lo\00"
@.str.12 = [3 x i8] c"\0A\0A\00"
define void @usage(i8* %0) {
%2 = alloca i8*
store i8* %0, i8** %2
%3 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([35 x i8], [35 x i8]* @.str, i64 0, i64 0))
%4 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.1, i64 0, i64 0))
%5 = load i8*, i8** %2
%6 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([27 x i8], [27 x i8]* @.str.2, i64 0, i64 0), i8* %5)
%7 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.3, i64 0, i64 0))
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([32 x i8], [32 x i8]* @.str.4, i64 0, i64 0))
%9 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.5, i64 0, i64 0))
%10 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str.6, i64 0, i64 0))
%11 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str.7, i64 0, i64 0))
%12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str.8, i64 0, i64 0), i32 3493)
%13 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([36 x i8], [36 x i8]* @.str.9, i64 0, i64 0))
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.10, i64 0, i64 0), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.11, i64 0, i64 0))
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.12, i64 0, i64 0))
ret void
}

LLVM IR (-O2):
@.str.2 = [27 x i8] c"%s [required] [optional]\0A\0A\00"
@.str.8 = [24 x i8] c"\09\09\09\09(default port: %d)\0A\00"
@.str.10 = [29 x i8] c"\09\09\09\09(default interface: %s)\0A\00"
@.str.11 = [3 x i8] c"lo\00"
@str = [34 x i8] c"\0APort Knocking Backdoor - client\0A\00"
@str.13 = [8 x i8] c"Usage:\0A\00"
@str.14 = [12 x i8] c"[required]:\00"
@str.15 = [31 x i8] c"\09 -d <dest_ip>\09\09destination ip\00"
@str.16 = [12 x i8] c"[optional]:\00"
@str.17 = [29 x i8] c"\09 -p <port>\09\09port connect to\00"
@str.18 = [35 x i8] c"\09 -i <interface>\09\09interface to use\00"
@str.19 = [2 x i8] c"\0A\00"
define void @usage(i8* %0) {
%2 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([34 x i8], [34 x i8]* @str, i64 0, i64 0))
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([8 x i8], [8 x i8]* @str.13, i64 0, i64 0))
%4 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([27 x i8], [27 x i8]* @.str.2, i64 0, i64 0), i8* %0)
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @str.14, i64 0, i64 0))
%6 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([31 x i8], [31 x i8]* @str.15, i64 0, i64 0))
%7 = tail call i32 @putchar(i32 10)
%8 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([12 x i8], [12 x i8]* @str.16, i64 0, i64 0))
%9 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([29 x i8], [29 x i8]* @str.17, i64 0, i64 0))
%10 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([24 x i8], [24 x i8]* @.str.8, i64 0, i64 0), i32 3493)
%11 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([35 x i8], [35 x i8]* @str.18, i64 0, i64 0))
%12 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([29 x i8], [29 x i8]* @.str.10, i64 0, i64 0), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.11, i64 0, i64 0))
%13 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([2 x i8], [2 x i8]* @str.19, i64 0, i64 0))
ret void
}