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! Just Enough SSL...

module jessl
implicit none

    interface 
    
        subroutine library_init() bind(c, name="OPENSSL_init_ssl")
        end subroutine library_init

        subroutine add_ssl_algorithms() bind(c, name="SSLeay_add_ssl_algorithms")
        end subroutine add_ssl_algorithms
        
        subroutine load_error_strings() bind(c, name="SSL_load_error_strings")
        end subroutine load_error_strings
        
        function tls_v1_3_client_method() bind(c, name="TLSv1_2_client_method")
        use iso_c_binding
        type(c_ptr)::tls_v1_3_client_method
        end function tls_v1_3_client_method

        function ctx_new(meth) bind(c, name="SSL_CTX_new")
        use iso_c_binding
        type(c_ptr)::ctx_new
        type(c_ptr), value::meth
        end function ctx_new
        
        function ssl_new(ctx) bind(c, name="SSL_new")
        use iso_c_binding
        type(c_ptr)::ssl_new
        type(c_ptr), value::ctx
        end function ssl_new
        
        function get_fd(ssl) bind(c, name="SSL_get_fd")
        use iso_c_binding
        integer(kind=c_int)::get_fd
        type(c_ptr), value::ssl
        end function get_fd
        
        function set_fd(ssl, fd) bind(c, name="SSL_set_fd")
        use iso_c_binding
        integer(kind=c_int)::set_fd
        integer(kind=c_int), value::fd
        type(c_ptr), value::ssl
        end function set_fd
        
        function ssl_connect(ssl) bind(c, name="SSL_connect")
        use iso_c_binding
        integer(kind=c_int)::ssl_connect
        type(c_ptr), value::ssl
        end function ssl_connect
        
        function ssl_shutdown(ssl) bind(c, name="SSL_shutdown")
        use iso_c_binding
        integer(kind=c_int)::ssl_shutdown
        type(c_ptr), value::ssl
        end function ssl_shutdown
        
        function ssl_free(ssl) bind(c, name="SSL_free")
        use iso_c_binding
        integer(kind=c_int)::ssl_free
        type(c_ptr), value::ssl
        end function ssl_free
        
        function ctx_free(ctx) bind(c, name="SSL_CTX_free")
        use iso_c_binding
        integer(kind=c_int)::ctx_free
        type(c_ptr), value::ctx
        end function ctx_free
        
        ! Actually a macro...
        !function get_cipher_c(ssl) bind(c, name="SSL_get_cipher_name")
        !use iso_c_binding
        !type(c_ptr)::get_cipher_c
        !type(c_ptr), value::ssl
        !end function get_cipher_c
        
        function read_c(ssl, buf, length) bind(c, name="SSL_read")
        use iso_c_binding
        type(c_ptr), value::ssl
        character(kind=c_char), dimension(*), intent(inout)::buf
        integer(kind=c_int), value::length
        integer(kind=c_int)::read_c
        end function read_c
        
        function write_c(ssl, buf, length) bind(c, name="SSL_write")
        use iso_c_binding
        type(c_ptr), value::ssl
        character(kind=c_char), dimension(*), intent(inout)::buf
        integer(kind=c_int), value::length
        integer(kind=c_int)::write_c
        end function write_c
        
        function get_error(ssl, retcode) bind(c, name="SSL_get_error")
        use iso_c_binding
        type(c_ptr), value::ssl
        integer(kind=c_int), value::retcode
        integer(kind=c_int)::get_error
        end function get_error
        
        function ssl_pending(ssl) bind(c, name="SSL_pending")
        use iso_c_binding
        type(c_ptr), value::ssl
        integer(kind=c_int)::ssl_pending
        end function ssl_pending
        
    end interface

contains

    function ssl_read(ssl, buf)
    use iso_c_binding
    implicit none
    
        type(c_ptr)::ssl
        character, dimension(:), intent(inout)::buf
        integer::ssl_read
        integer::bufsize
        
        character(kind=c_char), dimension(:), allocatable::cbuf
        bufsize = size(buf)
        allocate(cbuf(bufsize))
        
        ssl_read = read_c(ssl, cbuf, 1)
        buf = cbuf
        
        deallocate(cbuf)
        
    end function ssl_read
    
    function ssl_write(ssl, buf)
    use iso_c_binding
    implicit none
    
        type(c_ptr)::ssl
        character, dimension(:), intent(in)::buf
        integer::ssl_write
        
        character(kind=c_char), dimension(:), allocatable::cbuf
        
        allocate(cbuf(size(buf)))
        
        cbuf = buf
        cbuf(size(buf)) = c_null_char
        ssl_write = write_c(ssl, cbuf, size(buf))

        deallocate(cbuf)
    
    end function ssl_write
    
    subroutine get_cipher(ssl, res)
    use iso_c_binding
    implicit none
    
        character(:), allocatable, intent(out)::res
        type(c_ptr)::ssl
        
        type(c_ptr)::cptr
        
        character(kind=c_char), dimension(:), pointer::cstring
        
        integer::i
        
        cptr = c_null_ptr
        if(.not. c_associated(cptr)) then
        
            allocate(character(len=1)::res)
            res = " "
        
        else
        
            call c_f_pointer(cptr, cstring, [1])
        
            i = 1
            do while(cstring(i) /= c_null_char)
                i = i + 1
            end do
            allocate(character(len=(i-1))::res)
            
            i = 1
            do while(cstring(i) /= c_null_char)
                res(i:i) = cstring(i)
            end do
            
        end if
        
    end subroutine get_cipher

end module jessl