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module gemini
implicit none
private
public :: handle_request
contains
subroutine simplify_request(full_request, local_request)
use logging, only: write_log
implicit none
character(*), intent(in)::full_request
character(*), intent(out)::local_request
integer::i, j
! Get the file of interest
i = index(full_request, "://")
if(i <= 0) then
local_request = full_request
else
j = index(full_request(i+3:len_trim(full_request)), "/")
local_request = full_request((i+j+2):len_trim(full_request))
end if
call write_log("Simplified Local Request: "//trim(local_request))
end subroutine simplify_request
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 < len(buffer))
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_file(ssl, unit_number, mimetype)
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)::unit_number
character(*), intent(in)::mimetype
character, dimension(64)::buf
integer::buflen, written
call write_string(ssl, "20 "//trim(mimetype)//c_carriage_return//c_new_line)
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_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
use logging, only: write_log
implicit none
! For our TLS connection
type(c_ptr)::ctx
type(c_ptr)::method
type(c_ptr)::ssl
integer(kind=c_long)::res
! Requested file
character(1024)::request, local_request
character(512)::mimetype
character(len=:), pointer::filename_ptr
integer::rendered_unit, ioerror
call library_init()
filename_ptr => null()
method = tls_server_method()
ctx = ctx_new(method)
if(.not. C_ASSOCIATED(ctx)) then
call write_log("Context failed")
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")
call write_log("Public: "//trim(pubcert))
!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")
call write_log("Private: "//trim(privcert))
!call print_error()
return
end if
ssl = ssl_new(ctx)
call write_log("Initiating connection")
! So this is a GNU Extension...
res = set_read_fd(ssl, fnum(input_unit))
if(res /= 1) then
call write_log("set rfd failed")
!call print_error()
return
end if
res = set_write_fd(ssl, fnum(output_unit))
if(res /= 1) then
call write_log("set wfd failed")
!call print_error()
return
end if
res = ssl_accept(ssl)
if(res <= 0) then
call write_log("ssl_accept failed")
!call print_error()
return
end if
call write_log("Handling read_request")
! Do the actual protocol nonsense
call read_request(ssl, request)
call write_log("Request is "//trim(request))
call simplify_request(request, local_request)
if(len_trim(local_request) .ge. 4) then
if(local_request(1:4) == '/api') then
!call handle_api_request(request)
else
filename_ptr => external_request_gemini(local_request)
end if
else
filename_ptr => external_request_gemini(local_request)
end if
if(associated(filename_ptr)) then
open(newunit=rendered_unit, file=trim(filename_ptr), status="old", &
form="unformatted", iostat=ioerror, access="stream")
call write_log("transferring "//trim(filename_ptr))
call write_file(ssl, rendered_unit, "text/gemini")
close(rendered_unit)
if(filename_ptr(1:5) == '/tmp/') then
call unlink(filename_ptr)
end if
deallocate(filename_ptr)
end if
end subroutine handle_request
end module gemini
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