From fe2a0dab79bd4c029c849d9dd18113735a527d19 Mon Sep 17 00:00:00 2001
From: Benjamyn Love <blove@nexigen.digital>
Date: Fri, 2 Jun 2023 14:02:15 +1000
Subject: [PATCH] Push me and then just touch me

---
 .gitignore |  4 ++-
 main.nasm  | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 100 insertions(+), 1 deletion(-)
 create mode 100644 main.nasm

diff --git a/.gitignore b/.gitignore
index ba9e2b3..b152b76 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
-./main*
+main
+main_hello
+*.o
diff --git a/main.nasm b/main.nasm
new file mode 100644
index 0000000..ad4032d
--- /dev/null
+++ b/main.nasm
@@ -0,0 +1,97 @@
+; Comments start with a semicolon!
+BITS 64 			;
+CPU X64 			;
+
+section .rodata
+
+sun_path: db "/tmp/.X11-unix/X0", 0
+static sun_path:data
+
+section .text
+
+%define AF_UNIX			1
+%define SOCK_STREAM		1
+
+%define SYSCALL_WRITE   1
+%define SYSCALL_SOCKET		41
+%define SYSCALL_CONNECT 42
+%define SYSCALL_EXIT		60
+
+
+
+global _start
+
+; Create a UNIX domain socket and connect to the X11 server.
+; @returns the socket file descriptor
+x11_connect_to_server:
+static x11_connect_to_server:function
+  push rbp
+  mov rbp, rsp
+  
+  ; Open a Unix socket: socket(2)
+  mov rax, SYSCALL_SOCKET
+  mov rdi, AF_UNIX ; Unix socket
+  mov rsi, SOCK_STREAM ; TCP like
+  mov rdx, 0 ; Automatic protocol
+  syscall
+
+  cmp rax, 0 ; Check if we made the socket
+  jle die
+
+  mov rdi, rax ; Store the socket fs in rdi for the remainder of the function
+
+  sub rsp, 112 ; Store the struct sockaddr_un on the stack
+
+  mov WORD [rsp], AF_UNIX ; Set the sockaddr_un.sun_family to AF_UNIX
+  ; Fil lsoccaddr_un.sun_path with: "/tmp/.X11-unix/X0"
+  lea rsi, sun_path
+  mov r12, rdi ; Save the socket fd from rdi to r12
+  lea rdi, [rsp + 2]
+  cld
+  mov ecx, 19
+  rep movsb ; Copy.
+
+  ; Connect ot the server
+  mov rax, SYSCALL_CONNECT
+  mov rdi, r12
+  lea rsi, [rsp]
+  %define SIZEOF_SOCKADDR_UN 2+108
+  mov rdx, SIZEOF_SOCKADDR_UN
+  syscall
+
+  cmp rax, 0
+  jne die
+
+  mov rax, rdi
+
+  add rsp, 112
+
+  pop rbp
+  ret
+
+; Send the handshake to the X11 server and read the returned system information
+; @param rdi The socket fd
+; @returns The window root id (uint32_t) in rax
+x11_send_handshake:
+static x11_send_handshake:function
+  push rdp
+  mov rbp, rsp
+
+  sub rsp, 1<<15
+  mov BYTE [rsp + 0], 'l' ; Tell X11 we are little endian
+  mov WORD [rsp + 2], 11; Set the major version to 11
+
+  ; Send the 
+
+die:
+  mov rax, SYSCALL_EXIT
+  mov rdi, 1
+  syscall
+
+_start:
+  call x11_connect_to_server
+
+  ; Exit the program
+  mov rax, SYSCALL_EXIT
+  mov rdi, 0
+  syscall