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! Copyright (c) 2021 Approximatrix, LLC <support@approximatrix.com>
!
! Permission is hereby granted, free of charge, to any person obtaining a copy
! of this software and associated documentation files (the "Software"), to deal
! in the Software without restriction, including without limitation the rights
! to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
! copies of the Software, and to permit persons to whom the Software is
! furnished to do so, subject to the following conditions:
!
! The above copyright notice and this permission notice shall be included in
! all copies or substantial portions of the Software.
!
! The Software shall be used for Good, not Evil.
!
! THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
! IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
! FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
! AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
! LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
! OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
! SOFTWARE.
module gemini
implicit none
private
public :: handle_request
contains
subroutine read_request(ssl, req)
use jessl, only: ssl_read
use iso_c_binding
implicit none
type(c_ptr)::ssl
character(*), intent(out)::req
character, dimension(64)::buf
integer::bufread
integer::i, j
req = " "
i = 1
bufread = ssl_read(ssl, buf)
do while(bufread > 0)
do j = 1, bufread
if(buf(j) == c_new_line) then
exit
end if
if(buf(j) /= c_carriage_return) then
req(i:i) = buf(j)
i = i + 1
end if
end do
if(buf(j) == c_new_line) then
exit
end if
bufread = ssl_read(ssl, buf)
end do
end subroutine read_request
function read_into_buffer(unit_number, buffer)
implicit none
integer, intent(in)::unit_number
character, dimension(*), intent(out)::buffer
integer::read_into_buffer
integer::i, ierr
ierr = 0
i = 0
do while(ierr == 0 .and. i < 64)
i = i + 1
read(unit_number, iostat=ierr) buffer(i)
end do
if(ierr /= 0) then
i = i - 1
end if
read_into_buffer = i
end function read_into_buffer
subroutine write_status(ssl, code, meta)
use iso_c_binding, only: c_ptr, c_carriage_return, c_new_line
use jessl, only: ssl_write
use logging
implicit none
type(c_ptr)::ssl
integer, intent(in)::code
character(*), intent(in)::meta
character(8)::int_text
character(1024)::line
write(int_text, '(I8)') code
line = trim(adjustl(int_text))//" "//trim(meta)
call write_log("Status line: '"//trim(line)//"'", LOG_DEBUG)
call write_string(ssl, trim(line)//c_carriage_return//c_new_line)
end subroutine write_status
subroutine write_file(ssl, unit_number, mimetype)
use iso_c_binding, only: c_ptr
use jessl, only: ssl_write
use logging
use server_response, only: GEMINI_CODE_SUCCESS
implicit none
type(c_ptr)::ssl
integer, intent(in)::unit_number
character(*), intent(in)::mimetype
character, dimension(64)::buf
integer::buflen, written
call write_status(ssl, GEMINI_CODE_SUCCESS, mimetype)
buflen = read_into_buffer(unit_number, buf)
do while(buflen > 0)
written = ssl_write(ssl, buf(1:buflen))
buflen = read_into_buffer(unit_number, buf)
end do
end subroutine write_file
subroutine write_redirect(ssl, url)
use iso_c_binding, only: c_ptr
use server_response, only: GEMINI_CODE_REDIRECT
implicit none
type(c_ptr)::ssl
character(*), intent(in)::url
call write_status(ssl, GEMINI_CODE_REDIRECT, url)
end subroutine write_redirect
subroutine write_input_request(ssl, msg)
use iso_c_binding, only: c_ptr
use server_response, only: GEMINI_CODE_INPUT
implicit none
type(c_ptr)::ssl
character(*), intent(in)::msg
call write_status(ssl, GEMINI_CODE_INPUT, msg)
end subroutine write_input_request
subroutine write_failure(ssl)
use iso_c_binding, only: c_ptr
use server_response, only: GEMINI_CODE_PERMFAIL
implicit none
type(c_ptr)::ssl
call write_status(ssl, GEMINI_CODE_PERMFAIL, "Not Found")
end subroutine write_failure
subroutine write_string(ssl, string)
use jessl, only: ssl_write
use iso_c_binding, only: c_ptr
implicit none
type(c_ptr)::ssl
character(*)::string
character, dimension(:), allocatable::buf
integer::i
allocate(buf(len(string)))
do i = 1, len(string)
buf(i) = string(i:i)
end do
i = ssl_write(ssl, buf)
deallocate(buf)
end subroutine write_string
subroutine handle_request()
use jessl
use iso_c_binding
use config
use iso_fortran_env
use external_handling, only: external_request_gemini, external_request_titan
use api_handling
use logging
use server_response
implicit none
! For our TLS connection
type(c_ptr)::ctx
type(c_ptr)::method
type(c_ptr)::ssl
integer(kind=c_long)::res
type(request)::req
type(titan_request)::treq
type(response)::resp
! Requested file
character(1024)::text_request
character(32)::first
integer::rendered_unit, ioerror
call library_init()
method = tls_server_method()
ctx = ctx_new(method)
if(.not. C_ASSOCIATED(ctx)) then
call write_log("Context failed", LOG_NORMAL)
return
end if
! Seems to be a dummy now...
!res = ctx_set_ecdh_auto(ctx, 1)
if(.not. ctx_use_certificate_file(ctx, trim(pubcert), SSL_FILETYPE_PEM)) then
call write_log("Cert file failed", LOG_NORMAL)
call write_log("Public: "//trim(pubcert), LOG_NORMAL)
!call print_error()
return
end if
if(.not. ctx_use_private_key_file(ctx, trim(privcert), SSL_FILETYPE_PEM)) then
call write_log("Cert file failed", LOG_NORMAL)
call write_log("Private: "//trim(privcert), LOG_NORMAL)
!call print_error()
return
end if
ssl = ssl_new(ctx)
call write_log("Initiating connection", LOG_DEBUG)
! So this is a GNU Extension...
res = set_read_fd(ssl, fnum(input_unit))
if(res /= 1) then
call write_log("set rfd failed", LOG_NORMAL)
!call print_error()
return
end if
res = set_write_fd(ssl, fnum(output_unit))
if(res /= 1) then
call write_log("set wfd failed", LOG_NORMAL)
!call print_error()
return
end if
res = ssl_accept(ssl)
if(res <= 0) then
call write_log("ssl_accept failed", LOG_NORMAL)
!call print_error()
return
end if
call write_log("Handling read_request", LOG_DEBUG)
! Do the actual protocol nonsense
call read_request(ssl, text_request)
call write_log("Initializing object", LOG_DEBUG)
call req%init(text_request)
call write_log("Request object created", LOG_DEBUG)
call req%path_component(1, first)
if(trim(first) == 'api') then
call write_log("API call encountered", LOG_DEBUG)
if(req%protocol == "gemini") then
resp = api_request_gemini(req)
call write_log("resp filename is: '"//trim(resp%body_filename)//"'", LOG_DEBUG)
else if(req%protocol == "titan") then
call treq%init_from_request(req, ssl)
resp = api_request_titan(treq)
end if
else
if(req%protocol == "gemini") then
resp = external_request_gemini(req)
else if(req%protocol == "titan") then
call treq%init_from_request(req, ssl)
resp = external_request_titan(treq)
end if
end if
call write_log("Handling response", LOG_DEBUG)
! Handle the response
select case(resp%code)
case(GEMINI_CODE_INPUT)
call write_input_request(ssl, resp%message)
case(GEMINI_CODE_REDIRECT)
call write_redirect(ssl, resp%url)
case(GEMINI_CODE_PERMFAIL)
call write_failure(ssl)
case(GEMINI_CODE_SUCCESS)
call write_log("Sending '"//trim(resp%body_filename)//"' as "//trim(resp%body_mimetype), LOG_DEBUG)
open(newunit=rendered_unit, file=resp%body_filename, status="old", &
form="unformatted", iostat=ioerror, access="stream")
call write_file(ssl, rendered_unit, resp%body_mimetype)
call write_log("File written", LOG_DEBUG)
close(rendered_unit)
end select
call write_log("Cleanup", LOG_DEBUG)
call req%destroy()
call resp%destroy()
call write_log("Shutdown", LOG_DEBUG)
res = ssl_shutdown(ssl)
res = ssl_free(ssl)
res = ctx_free(ctx)
end subroutine handle_request
end module gemini
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