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! Copyright (c) 2020 Jeffrey Armstrong <jeff@rainbow-100.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 request
use network
use iso_c_binding
implicit none
integer, parameter::bufsize = 65536
integer, parameter::CONNECTION_NONE = 0
integer, parameter::CONNECTION_CLOSED = 1
integer, parameter::CONNECTION_SERVER_NOT_FOUND = 2
integer, parameter::CONNECTION_SOCKET_FAILURE = 3
integer, parameter::CONNECTION_SSL_SETUP_FAILURE = 4
integer, parameter::CONNECTION_SSL_CONN_FAILURE = 5
integer, parameter::CONNECTION_OPEN = 6
character(23), dimension(0:6), parameter:: connection_code_str = &
["No Connection ", &
"Connection Closed ", &
"Server Not Found ", &
"Local Socket Failure ", &
"SSL Configuration Error", &
"SSL Connection Failure ", &
"SSL Connection Open " ]
type :: connection
integer::code
type(simple_hostent)::host
integer::socket
type(c_ptr)::ssl_ctx
type(c_ptr)::ssl
end type connection
contains
function translate_connection_code(code)
implicit none
integer, intent(in)::code
character(23)::translate_connection_code
if(code >= lbound(connection_code_str, 1) .and. &
code <= ubound(connection_code_str, 1)) then
translate_connection_code = connection_code_str(code)
else
translate_connection_code = "Unknown Error"
end if
end function translate_connection_code
function open_connection(server, port) result(conn)
use jessl
use network
implicit none
character(*), intent(in)::server
integer, intent(in), optional::port
type(connection)::conn
type(sockaddr_in), target::sa
type(c_ptr)::ssl_method
conn%code = CONNECTION_NONE
! Lookup host
conn%host = gethostbyname(server)
if((.not. allocated(conn%host%h_name)) .or. (conn%host%h_addr4 == 0)) then
conn%code = CONNECTION_SERVER_NOT_FOUND
return
end if
! Build the socket
sa%sin_family = AF_INET
sa%sin_addr%s_addr = conn%host%h_addr4
if(present(port)) then
sa%sin_port = htons(port)
else
sa%sin_port = htons(1965)
end if
conn%socket = socket(AF_INET, SOCK_STREAM, 0)
if(.not. connect(conn%socket, sa)) then
conn%code = CONNECTION_SOCKET_FAILURE
return
end if
! Set up ssl now
ssl_method = tls_client_method()
conn%ssl_ctx = ctx_new(ssl_method)
conn%ssl = ssl_new(conn%ssl_ctx)
if((.not. c_associated(conn%ssl)) .or. &
(set_tlsext_host_name(conn%ssl, server) == 0) .OR. &
(set_fd(conn%ssl, conn%socket) /= 1)) then
conn%code = CONNECTION_SSL_SETUP_FAILURE
return
end if
! Connect via ssl
if(ssl_connect(conn%ssl) /= 1) then
conn%code = CONNECTION_SSL_CONN_FAILURE
return
end if
! Here, the connection is live
conn%code = CONNECTION_OPEN
end function open_connection
subroutine close_connection(conn)
use jessl
use network
implicit none
type(connection), intent(inout)::conn
integer::res
if(conn%code >= CONNECTION_OPEN) then
res = ssl_shutdown(conn%ssl)
end if
if(conn%code >= CONNECTION_SSL_CONN_FAILURE) then
res = ssl_free(conn%ssl)
end if
if(conn%code >= CONNECTION_SSL_SETUP_FAILURE) then
res = ctx_free(conn%ssl_ctx)
end if
if(conn%code > CONNECTION_SOCKET_FAILURE) then
call close_socket(conn%socket)
end if
if(conn%code > CONNECTION_SERVER_NOT_FOUND) then
deallocate(conn%host%h_name)
end if
conn%code = CONNECTION_CLOSED
end subroutine close_connection
subroutine get_server_from_url(url, server, port)
implicit none
character(*), intent(in)::url
character(:), allocatable, intent(out)::server
integer, intent(out)::port
integer::start_server, end_server, length
integer::start_port, iostatus
port = -1
start_server = index(url, "://")
if(start_server > 0) then
start_server = start_server + 3
end_server = index(url(start_server:len_trim(url)), "/")
if(end_server <= 0) then
end_server = len_trim(url)
else
! Get rid of trailing slash
end_server = end_server + start_server - 2
end if
length = end_server - start_server + 1
allocate(character(len=length) :: server)
server = url(start_server:end_server)
end if
! Need to check if a port was specified too
start_port = index(server, ":")
if(start_port > 0) then
read(server(start_port+1:len_trim(server)), *, iostat=iostatus) port
if(iostatus /= 0) then
port = -1
end if
server = server(1:start_port-1)
end if
end subroutine get_server_from_url
function send_string(ssl, str, trimming) result(success)
use iso_c_binding
use jessl
implicit none
logical::success
type(c_ptr)::ssl
character(*), intent(in)::str
logical, intent(in), optional::trimming
integer::start_send
integer::chars_sent_this_time, chars_sending
integer::i, bytes
integer::string_length
character, dimension(bufsize)::buffer
if(present(trimming)) then
if(trimming) then
string_length = len_trim(str)
else
string_length = len(str)
end if
else
string_length = len_trim(str)
end if
success = .true.
start_send = 1
do while(start_send <= string_length)
chars_sending = 0
do i = start_send, string_length
buffer(i-start_send+1) = str(i:i)
chars_sending = chars_sending + 1
if(chars_sending == bufsize) then
exit
end if
end do
! A null character seems necessary at the end of the request
if(i >= string_length) then
chars_sending = chars_sending + 1
buffer(chars_sending) = c_null_char
end if
! Minus 1 because we're sending start_send as well
chars_sent_this_time = ssl_write(ssl, buffer(start_send:(start_send+chars_sending-1)))
if(chars_sent_this_time < 0) then
success = .false.
exit
end if
start_send = start_send + chars_sent_this_time
end do
end function send_string
function retrieve_characters(ssl, arr) result(chars_read)
use iso_c_binding
use jessl
implicit none
integer::chars_read
type(c_ptr)::ssl
character(len=1), dimension(:), intent(inout)::arr
chars_read = ssl_read(ssl, arr)
end function retrieve_characters
end module request
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