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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2020 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import asyncio
import ssl
import struct
from typing import Tuple
from typing import Any
from .... import aiotools
from .errors import RfbConnectionError
# =====
def rfb_format_remote(writer: asyncio.StreamWriter) -> str:
return "[%s]:%d" % (writer.transport.get_extra_info("peername")[:2])
class RfbClientStream:
def __init__(self, reader: asyncio.StreamReader, writer: asyncio.StreamWriter) -> None:
self.__reader = reader
self.__writer = writer
self._remote = rfb_format_remote(writer)
# =====
async def _read_number(self, fmt: str) -> int:
assert len(fmt) == 1
try:
if fmt == "B":
return (await self.__reader.readexactly(1))[0]
else:
fmt = f">{fmt}"
return struct.unpack(fmt, await self.__reader.readexactly(struct.calcsize(fmt)))[0]
except (ConnectionError, asyncio.IncompleteReadError) as err:
raise RfbConnectionError(err)
async def _read_struct(self, fmt: str) -> Tuple[int, ...]:
assert len(fmt) > 1
try:
fmt = f">{fmt}"
return struct.unpack(fmt, (await self.__reader.readexactly(struct.calcsize(fmt))))
except (ConnectionError, asyncio.IncompleteReadError) as err:
raise RfbConnectionError(err)
async def _read_text(self, length: int) -> str:
try:
return (await self.__reader.readexactly(length)).decode("utf-8", errors="ignore")
except (ConnectionError, asyncio.IncompleteReadError) as err:
raise RfbConnectionError(err)
# =====
async def _write_struct(self, fmt: str, *values: Any, drain: bool=True) -> None:
try:
if not fmt:
for value in values:
self.__writer.write(value)
elif fmt == "B":
assert len(values) == 1
self.__writer.write(bytes([values[0]]))
else:
self.__writer.write(struct.pack(f">{fmt}", *values))
if drain:
await self.__writer.drain()
except ConnectionError as err:
raise RfbConnectionError(err)
async def _write_reason(self, text: str, drain: bool=True) -> None:
encoded = text.encode("utf-8", errors="ignore")
await self._write_struct("L", len(encoded), drain=False)
try:
self.__writer.write(encoded)
if drain:
await self.__writer.drain()
except ConnectionError as err:
raise RfbConnectionError(err)
async def _write_fb_update(self, width: int, height: int, encoding: int, drain: bool=True) -> None:
await self._write_struct(
"BxH HH HH l",
0, # FB update
1, # Number of rects
0, 0, width, height, encoding,
drain=drain,
)
# =====
async def _start_tls(self, ssl_context: ssl.SSLContext, ssl_timeout: float) -> None:
loop = asyncio.get_event_loop()
ssl_reader = asyncio.StreamReader()
protocol = asyncio.StreamReaderProtocol(ssl_reader)
transport = await loop.start_tls(
self.__writer.transport,
protocol,
ssl_context,
server_side=True,
ssl_handshake_timeout=ssl_timeout,
)
ssl_reader.set_transport(transport)
ssl_writer = asyncio.StreamWriter(
transport=transport,
protocol=protocol,
reader=ssl_reader,
loop=loop,
)
self.__reader = ssl_reader
self.__writer = ssl_writer
async def _close(self) -> None:
await aiotools.close_writer(self.__writer)
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