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path: root/main.asm
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include 'sys.asm'

format ELF64 executable

struc db [data]
{
  common
    . db data
    .size = $ - .
}

segment writable readable
connect_header db 'HTTP/1.1 200 OK', 13, 10
	    db 'Content-Type: text/html', 13, 10
	    db 'Connection: close', 13, 10
	    db 13, 10
	    db '<!DOCTYPE html><html><head><title>asmsite</title></head><body>Hello, World!</body></html>', 10
connect_header_len = $ - connect_header

stat_msg db 'Get file stats', 10
open_msg db 'Open file', 10
read_msg db 'Read file', 10
close_msg db 'Close file', 10
socket_msg db 'Open socket', 10
bind_msg db 'Bind socket', 10
listen_msg db 'Listen', 10
accept_msg db 'Wait for connection', 10
msg_dn db ':', 10

indexname db 'index.html'
indexlen dq 0

indexfd dd -1
socketfd dd -1
connfd dd -1

indexbuf dd 0
indexbuf_len dq 0

struc servaddr_in
{
  .sin_family dw 0
  .sin_port dw 0
  .sin_addr dd 0
  .sin_zero dq 0
  ;; .size = $ - .sin_family
}
serveraddr servaddr_in
serveraddr_len = $ - serveraddr.sin_family
clientaddr servaddr_in
clientaddr_len dd serveraddr_len

segment readable executable

entry _main
_main:
  ls_write STDOUT, open_msg, open_msg.size
  ls_open indexname, O_RDONLY, 0
  mov qword [indexfd], rax
  cmp [indexfd], 0
  jl error

  ls_write STDOUT, read_msg, read_msg.size
  ls_read qword [indexfd], indexbuf, indexbuf_len
  cmp qword rax, 0
  jl error
  mov [indexlen], rax

  ls_write STDOUT, close_msg, close_msg.size
  ls_close qword [indexfd]
  cmp qword rax, 0
  jl error

  ls_write STDOUT, indexname, indexname.size
  ls_write STDOUT, msg_dn, msg_dn.size
  ls_write STDOUT, indexbuf, [indexlen]
  cmp qword rax, 0
  jl error

  ls_write STDOUT, socket_msg, socket_msg.size
  ls_socket AF_INET, SOCK_STREAM, 0
  mov qword [socketfd], rax
  cmp [socketfd], 0
  jl error

  ls_write STDOUT, bind_msg, bind_msg.size
  mov [serveraddr.sin_family], AF_INET
  mov [serveraddr.sin_port], 0xb80b
  mov [serveraddr.sin_addr], INADDR_ANY
  ls_bind qword [socketfd], serveraddr, serveraddr_len
  cmp rax, 0
  jl error

  ls_write STDOUT, listen_msg, listen_msg.size
  ls_listen qword [socketfd], 5
  cmp rax, 0
  jl error

listen:
  ls_write STDOUT, accept_msg, accept_msg.size
  ls_accept qword [socketfd], clientaddr, clientaddr_len
  cmp rax, 0
  jl error

  mov qword [connfd], rax

  ls_write qword [connfd], connect_header, connect_header_len

  ls_close qword [connfd]

  jmp listen
  
  ls_close qword [indexfd]
  ls_close qword [socketfd]
  ls_close qword [connfd]
  ls_exit 0

error:
  ls_close qword [indexfd]
  ls_close qword [socketfd]
  ls_close qword [connfd]
  ls_exit 1