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emailler/ip65/httpd.s

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; a simple HTTP server
; to use - call httpd_start with AX pointing at routine to call for each inbound page
.include "zeropage.inc"
.include "../inc/common.inc"
.include "../inc/error.inc"
HTTPD_TIMEOUT_SECONDS = 5 ; what's the maximum time we let 1 connection be open for?
.export httpd_start
.export httpd_port_number
.export httpd_send_response
.export httpd_response_buffer_length
.import http_parse_request
.import tcp_listen
.import tcp_callback
.import ip65_process
.import check_for_abort_key
.import ip65_error
.import print
.import copymem
.importzp copy_src
.importzp copy_dest
.import tcp_inbound_data_ptr
.import tcp_inbound_data_length
.import tcp_send_data_len
.import tcp_send
.import tcp_close
.import timer_seconds
temp_ptr = ptr1
.bss
io_buf: .res $800
found_eol: .res 1
connection_closed: .res 1
httpd_response_buffer_length: .res 2
output_buffer_length: .res 2
sent_header: .res 1
connection_timeout_seconds: .res 1
tcp_buffer_ptr: .res 2
buffer_size: .res 1
.data
httpd_port_number: .word 80
jump_to_callback:
jmp $ffff
get_next_byte:
lda $ffff
inc get_next_byte+1
bne @skip
inc get_next_byte+2
@skip:
rts
emit_a:
sta $ffff
inc emit_a+1
bne :+
inc emit_a+2
: inc output_buffer_length
bne :+
inc output_buffer_length+1
lda output_buffer_length+1
cmp #2
bne :+
jsr send_buffer
: rts
.code
; start a HTTP server
; this routine will stay in an endless loop that is broken only if user press the ABORT key (runstop on a c64)
; inputs:
; httpd_port_number = port number to listen on
; AX = pointer to routine to callback for each inbound HTTP request
; outputs:
; none
httpd_start:
stax jump_to_callback+1
@listen:
jsr tcp_close
ldax #io_buf
stax tcp_buffer_ptr
ldax #http_callback
stax tcp_callback
ldax httpd_port_number
jsr tcp_listen
bcc @connect_ok
rts
@connect_ok:
lda #0
sta connection_closed
sta found_eol
clc
jsr timer_seconds ; time of day clock: seconds (in BCD)
sed
adc #HTTPD_TIMEOUT_SECONDS
cmp #$60
bcc @timeout_set
sec
sbc #$60
@timeout_set:
cld
sta connection_timeout_seconds
@main_polling_loop:
jsr ip65_process
jsr check_for_abort_key
bcc @no_abort
lda #IP65_ERROR_ABORTED_BY_USER
sta ip65_error
rts
@no_abort:
lda found_eol
bne @got_eol
jsr timer_seconds ; time of day clock: seconds
cmp connection_timeout_seconds
beq @connection_timed_out
lda connection_closed
beq @main_polling_loop
@connection_timed_out:
jmp @listen
@got_eol:
ldax #io_buf
jsr http_parse_request
jsr jump_to_callback ; call the handler to generate the response for this request.
; AX should now point at data to be sent
; Y should contain the content type/status code
bcs :+ ; carry is set if the callback routine already sent the response
jsr httpd_send_response
: jmp @listen ; go listen for the next request
http_callback:
lda tcp_inbound_data_length+1
cmp #$ff
bne @not_eof
inc connection_closed
@done:
rts
@not_eof:
lda found_eol
bne @done
; copy this chunk to our input buffer
ldax tcp_buffer_ptr
stax copy_dest
ldax tcp_inbound_data_ptr
stax copy_src
ldax tcp_inbound_data_length
jsr copymem
; increment the pointer into the input buffer
clc
lda tcp_buffer_ptr
adc tcp_inbound_data_length
sta tcp_buffer_ptr
sta temp_ptr
lda tcp_buffer_ptr+1
adc tcp_inbound_data_length+1
sta tcp_buffer_ptr+1
sta temp_ptr+1
; put a null byte at the end (assumes we have set temp_ptr already)
lda #0
tay
sta (temp_ptr),y
; look for CR or LF in input
sta found_eol
ldax #io_buf
stax get_next_byte+1
@look_for_eol:
jsr get_next_byte
cmp #$0a
beq @found_eol
cmp #$0d
bne @not_eol
@found_eol:
inc found_eol
rts
@not_eol:
cmp #0
bne @look_for_eol
rts
reset_output_buffer:
ldax #io_buf
sta emit_a+1
stx emit_a+2
lda #0
sta output_buffer_length
sta output_buffer_length+1
rts
; send HTTP response
; inputs:
; AX = pointer to data to be sent
; httpd_response_buffer_length = length of data to be sent
; Y = content type/status code
; outputs:
; none
httpd_send_response:
stax get_next_byte+1
jsr reset_output_buffer
jsr send_header
@response_loop:
dec httpd_response_buffer_length
lda httpd_response_buffer_length
cmp #$ff
bne @not_last_byte
dec httpd_response_buffer_length+1
lda httpd_response_buffer_length+1
cmp #$ff
bne @not_last_byte
jmp send_buffer
@not_last_byte:
jsr get_next_byte
jsr emit_a
jmp @response_loop
send_buffer:
ldax output_buffer_length
stax tcp_send_data_len
ldax #io_buf
jsr tcp_send
jmp reset_output_buffer
send_header:
; inputs: Y = header type
; $00 = no header (assume header sent already)
; $01 = 200 OK, 'text/text'
; $02 = 200 OK, 'text/html'
; $03 = 200 OK, 'application/octet-stream'
; $04 = 404 Not Found
; $05..$FF = 500 System Error
cpy #00
bne :+
rts
: cpy #1
bne @not_text
jsr emit_ok_status_line_and_content_type
ldax #text_text
jsr emit_string
jmp @done
@not_text:
cpy #2
bne @not_html
jsr emit_ok_status_line_and_content_type
ldax #text_html
jsr emit_string
jmp @done
@not_html:
cpy #3
bne @not_binary
jsr emit_ok_status_line_and_content_type
ldax #application_octet_stream
jsr emit_string
jmp @done
@not_binary:
cpy #4
bne @not_404
ldax #http_version
jsr emit_string
ldax #status_not_found
jsr emit_string
jsr @done
ldax #status_not_found
jmp emit_string
@not_404:
ldax #http_version
jsr emit_string
ldax #status_system_error
jsr emit_string
jsr @done
ldax #status_system_error
jmp emit_string
@done:
ldax #end_of_header
jmp emit_string
emit_ok_status_line_and_content_type:
ldax #http_version
jsr emit_string
ldax #status_ok
jsr emit_string
ldax #content_type
jmp emit_string
emit_string:
stax temp_ptr
ldy #0
@next_byte:
lda (temp_ptr),y
beq @done
jsr emit_a
iny
bne @next_byte
@done:
rts
.rodata
CR = $0D
LF = $0A
http_version:
.byte "HTTP/1.0 ",0
status_ok:
.byte "200 OK",CR,LF,0
status_not_found:
.byte "404 Not Found",CR,LF,0
status_system_error:
.byte "500 System Error",CR,LF,0
content_type:
.byte "Content-Type: ",0
text_text:
.byte "text/text",CR,LF,0
text_html:
.byte "text/html",CR,LF,0
application_octet_stream:
.byte "application/octet-stream",CR,LF,0
end_of_header:
.byte "Connection: Close",CR,LF
.byte "Server: IP65_httpd/0.6502",CR,LF
.byte CR,LF,0
; -- LICENSE FOR httpd.s --
; The contents of this file are subject to the Mozilla Public License
; Version 1.1 (the "License"); you may not use this file except in
; compliance with the License. You may obtain a copy of the License at
; http://www.mozilla.org/MPL/
;
; Software distributed under the License is distributed on an "AS IS"
; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
; License for the specific language governing rights and limitations
; under the License.
;
; The Original Code is ip65.
;
; The Initial Developer of the Original Code is Jonno Downes,
; jonno@jamtronix.com.
; Portions created by the Initial Developer are Copyright (C) 2009
; Jonno Downes. All Rights Reserved.
; -- LICENSE END --
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