809 lines
22 KiB
Python
809 lines
22 KiB
Python
"""
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===============================
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XMODEM file transfer protocol
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===============================
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.. $Id$
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This is a literal implementation of XMODEM.TXT_, XMODEM1K.TXT_ and
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XMODMCRC.TXT_, support for YMODEM and ZMODEM is pending. YMODEM should
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be fairly easy to implement as it is a hack on top of the XMODEM
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protocol using sequence bytes ``0x00`` for sending file names (and some
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meta data).
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.. _XMODEM.TXT: doc/XMODEM.TXT
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.. _XMODEM1K.TXT: doc/XMODEM1K.TXT
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.. _XMODMCRC.TXT: doc/XMODMCRC.TXT
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Data flow example including error recovery
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==========================================
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Here is a sample of the data flow, sending a 3-block message.
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It includes the two most common line hits - a garbaged block,
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and an ``ACK`` reply getting garbaged. ``CRC`` or ``CSUM`` represents
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the checksum bytes.
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XMODEM 128 byte blocks
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----------------------
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::
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SENDER RECEIVER
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<-- NAK
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SOH 01 FE Data[128] CSUM -->
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<-- ACK
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SOH 02 FD Data[128] CSUM -->
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<-- ACK
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SOH 03 FC Data[128] CSUM -->
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<-- ACK
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SOH 04 FB Data[128] CSUM -->
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<-- ACK
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SOH 05 FA Data[100] CPMEOF[28] CSUM -->
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<-- ACK
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EOT -->
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<-- ACK
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XMODEM-1k blocks, CRC mode
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--------------------------
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::
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SENDER RECEIVER
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<-- C
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STX 01 FE Data[1024] CRC CRC -->
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<-- ACK
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STX 02 FD Data[1024] CRC CRC -->
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<-- ACK
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STX 03 FC Data[1000] CPMEOF[24] CRC CRC -->
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<-- ACK
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EOT -->
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<-- ACK
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Mixed 1024 and 128 byte Blocks
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------------------------------
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::
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SENDER RECEIVER
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<-- C
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STX 01 FE Data[1024] CRC CRC -->
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<-- ACK
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STX 02 FD Data[1024] CRC CRC -->
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<-- ACK
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SOH 03 FC Data[128] CRC CRC -->
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<-- ACK
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SOH 04 FB Data[100] CPMEOF[28] CRC CRC -->
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<-- ACK
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EOT -->
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<-- ACK
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YMODEM Batch Transmission Session (1 file)
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------------------------------------------
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::
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SENDER RECEIVER
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<-- C (command:rb)
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SOH 00 FF foo.c NUL[123] CRC CRC -->
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<-- ACK
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<-- C
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SOH 01 FE Data[128] CRC CRC -->
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<-- ACK
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SOH 02 FC Data[128] CRC CRC -->
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<-- ACK
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SOH 03 FB Data[100] CPMEOF[28] CRC CRC -->
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<-- ACK
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EOT -->
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<-- NAK
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EOT -->
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<-- ACK
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<-- C
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SOH 00 FF NUL[128] CRC CRC -->
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<-- ACK
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"""
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__author__ = "Wijnand Modderman <maze@pyth0n.org>"
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__copyright__ = ["Copyright (c) 2010 Wijnand Modderman", "Copyright (c) 1981 Chuck Forsberg"]
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__license__ = "MIT"
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__version__ = "0.3.2"
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import logging
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import time
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import sys
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from functools import partial
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import collections
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# Loggerr
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log = logging.getLogger("xmodem")
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# Protocol bytes
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SOH = bytes([0x01])
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STX = bytes([0x02])
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EOT = bytes([0x04])
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ACK = bytes([0x06])
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DLE = bytes([0x10])
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NAK = bytes([0x15])
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CAN = bytes([0x18])
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CRC = bytes([0x43]) # C
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class XMODEM(object):
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"""
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XMODEM Protocol handler, expects an object to read from and an object to
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write to.
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>>> def getc(size, timeout=1):
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... return data or None
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...
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>>> def putc(data, timeout=1):
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... return size or None
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...
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>>> modem = XMODEM(getc, putc)
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:param getc: Function to retreive bytes from a stream
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:type getc: callable
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:param putc: Function to transmit bytes to a stream
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:type putc: callable
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:param mode: XMODEM protocol mode
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:type mode: string
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:param pad: Padding character to make the packets match the packet size
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:type pad: char
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"""
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# crctab calculated by Mark G. Mendel, Network Systems Corporation
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crctable = [
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0x0000,
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0x1021,
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0x2042,
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0x3063,
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0x4084,
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0x50A5,
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0x60C6,
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0x70E7,
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0x8108,
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0x9129,
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0xA14A,
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0xB16B,
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0xC18C,
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0xD1AD,
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0xE1CE,
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0xF1EF,
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0x1231,
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0x0210,
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0x3273,
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0x2252,
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0x52B5,
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0x4294,
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0x72F7,
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0x62D6,
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0x9339,
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0x8318,
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0xB37B,
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0xA35A,
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0xD3BD,
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0xC39C,
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0xF3FF,
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0xE3DE,
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0x2462,
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0x3443,
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0x0420,
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0x1401,
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0x64E6,
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0x74C7,
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0x44A4,
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0x5485,
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0xA56A,
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0xB54B,
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0x8528,
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0x9509,
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0xE5EE,
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0xF5CF,
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0xC5AC,
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0xD58D,
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0x3653,
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0x2672,
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0x1611,
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0x0630,
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0x76D7,
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0x66F6,
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0x5695,
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0x46B4,
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0xB75B,
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0xA77A,
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0x9719,
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0x8738,
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0xF7DF,
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0xE7FE,
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0xD79D,
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0xC7BC,
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0x48C4,
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0x58E5,
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0x6886,
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0x78A7,
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0x0840,
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0x1861,
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0x2802,
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0x3823,
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0xC9CC,
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0xD9ED,
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0xE98E,
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0xF9AF,
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0x8948,
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0x9969,
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0xA90A,
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0xB92B,
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0x5AF5,
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0x4AD4,
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0x7AB7,
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0x6A96,
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0x1A71,
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0x0A50,
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0x3A33,
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0x2A12,
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0xDBFD,
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0xCBDC,
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0xFBBF,
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0xEB9E,
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0x9B79,
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0x8B58,
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0xBB3B,
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0xAB1A,
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0x6CA6,
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0x7C87,
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0x4CE4,
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0x5CC5,
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0x2C22,
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0x3C03,
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0x0C60,
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0x1C41,
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0xEDAE,
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0xFD8F,
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0xCDEC,
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0xDDCD,
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0xAD2A,
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0xBD0B,
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0x8D68,
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0x9D49,
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0x7E97,
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0x6EB6,
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0x5ED5,
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0x4EF4,
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0x3E13,
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0x2E32,
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0x1E51,
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0x0E70,
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0xFF9F,
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0xEFBE,
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0xDFDD,
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0xCFFC,
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0xBF1B,
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0xAF3A,
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0x9F59,
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0x8F78,
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0x9188,
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0x81A9,
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0xB1CA,
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0xA1EB,
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0xD10C,
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0xC12D,
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0xF14E,
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0xE16F,
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0x1080,
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0x00A1,
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0x30C2,
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0x20E3,
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0x5004,
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0x4025,
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0x7046,
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0x6067,
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0x83B9,
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0x9398,
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0xA3FB,
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0xB3DA,
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0xC33D,
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0xD31C,
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0xE37F,
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0xF35E,
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0x02B1,
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0x1290,
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0x22F3,
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0x32D2,
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0x4235,
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0x5214,
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0x6277,
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0x7256,
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0xB5EA,
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0xA5CB,
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0x95A8,
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0x8589,
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0xF56E,
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0xE54F,
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0xD52C,
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0xC50D,
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0x34E2,
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0x24C3,
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0x14A0,
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0x0481,
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0x7466,
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0x6447,
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0x5424,
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0x4405,
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0xA7DB,
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0xB7FA,
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0x8799,
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0x97B8,
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0xE75F,
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0xF77E,
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0xC71D,
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0xD73C,
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0x26D3,
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0x36F2,
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0x0691,
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0x16B0,
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0x6657,
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0x7676,
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0x4615,
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0x5634,
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0xD94C,
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0xC96D,
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0xF90E,
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0xE92F,
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0x99C8,
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0x89E9,
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0xB98A,
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0xA9AB,
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0x5844,
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0x4865,
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0x7806,
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0x6827,
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0x18C0,
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0x08E1,
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0x3882,
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0x28A3,
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0xCB7D,
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0xDB5C,
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0xEB3F,
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0xFB1E,
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0x8BF9,
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0x9BD8,
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0xABBB,
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0xBB9A,
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0x4A75,
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0x5A54,
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0x6A37,
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0x7A16,
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0x0AF1,
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0x1AD0,
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0x2AB3,
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0x3A92,
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0xFD2E,
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0xED0F,
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0xDD6C,
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0xCD4D,
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0xBDAA,
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0xAD8B,
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0x9DE8,
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0x8DC9,
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0x7C26,
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0x6C07,
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0x5C64,
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0x4C45,
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0x3CA2,
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0x2C83,
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0x1CE0,
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0x0CC1,
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0xEF1F,
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0xFF3E,
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0xCF5D,
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0xDF7C,
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0xAF9B,
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0xBFBA,
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0x8FD9,
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0x9FF8,
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0x6E17,
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0x7E36,
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0x4E55,
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0x5E74,
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0x2E93,
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0x3EB2,
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0x0ED1,
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0x1EF0,
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]
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def __init__(self, getc, putc, mode="xmodem", pad=b"\x1a"):
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self.getc = getc
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self.putc = putc
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self.mode = mode
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self.pad = pad
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def abort(self, count=2, timeout=60):
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"""
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Send an abort sequence using CAN bytes.
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"""
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for counter in range(0, count):
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self.putc(CAN, timeout)
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def send(self, stream, retry=32, timeout=360, quiet=0, callback=None):
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"""
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Send a stream via the XMODEM protocol.
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>>> stream = file('/etc/issue', 'rb')
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>>> print modem.send(stream)
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True
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Returns ``True`` upon succesful transmission or ``False`` in case of
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failure.
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:param stream: The stream object to send data from.
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:type stream: stream (file, etc.)
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:param retry: The maximum number of times to try to resend a failed
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packet before failing.
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:type retry: int
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:param timeout: The number of seconds to wait for a response before
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timing out.
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:type timeout: int
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:param quiet: If 0, it prints info to stderr. If 1, it does not print any info.
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:type quiet: int
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:param callback: Reference to a callback function that has the
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following signature. This is useful for
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getting status updates while a xmodem
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transfer is underway.
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Expected callback signature:
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def callback(total_packets, success_count, error_count)
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:type callback: callable
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"""
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# initialize protocol
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try:
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packet_size = dict(xmodem=128, xmodem1k=1024)[self.mode]
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except AttributeError:
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raise ValueError("An invalid mode was supplied")
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error_count = 0
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crc_mode = 0
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cancel = 0
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while True:
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char = self.getc(1)
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if char:
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if char == NAK:
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crc_mode = 0
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break
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elif char == CRC:
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crc_mode = 1
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break
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elif char == CAN:
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if not quiet:
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print("received CAN", file=sys.stderr)
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if cancel:
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return False
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else:
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cancel = 1
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else:
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log.error("send ERROR expected NAK/CRC, got %s" % (ord(char),))
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error_count += 1
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if error_count >= retry:
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self.abort(timeout=timeout)
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return False
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# send data
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error_count = 0
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success_count = 0
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total_packets = 0
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sequence = 1
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while True:
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data = stream.read(packet_size)
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if not data:
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log.info("sending EOT")
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# end of stream
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break
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total_packets += 1
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data = data.ljust(packet_size, self.pad)
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if crc_mode:
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crc = self.calc_crc(data)
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else:
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crc = self.calc_checksum(data)
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# emit packet
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while True:
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if packet_size == 128:
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self.putc(SOH)
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else: # packet_size == 1024
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self.putc(STX)
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self.putc(bytes([sequence]))
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self.putc(bytes([0xFF - sequence]))
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self.putc(data)
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if crc_mode:
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self.putc(bytes([crc >> 8]))
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self.putc(bytes([crc & 0xFF]))
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else:
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self.putc(bytes([crc]))
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char = self.getc(1, timeout)
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if char == ACK:
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success_count += 1
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if isinstance(callback, collections.Callable):
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callback(total_packets, success_count, error_count)
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break
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if char == NAK:
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error_count += 1
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if isinstance(callback, collections.Callable):
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callback(total_packets, success_count, error_count)
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if error_count >= retry:
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# excessive amounts of retransmissions requested,
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# abort transfer
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self.abort(timeout=timeout)
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log.warning("excessive NAKs, transfer aborted")
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return False
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# return to loop and resend
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continue
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else:
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log.error("Not ACK, Not NAK")
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error_count += 1
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if isinstance(callback, collections.Callable):
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callback(total_packets, success_count, error_count)
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if error_count >= retry:
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# excessive amounts of retransmissions requested,
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# abort transfer
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self.abort(timeout=timeout)
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log.warning("excessive protocol errors, transfer aborted")
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return False
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# return to loop and resend
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continue
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# protocol error
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self.abort(timeout=timeout)
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log.error("protocol error")
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return False
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# keep track of sequence
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sequence = (sequence + 1) % 0x100
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while True:
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# end of transmission
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self.putc(EOT)
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# An ACK should be returned
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char = self.getc(1, timeout)
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if char == ACK:
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break
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else:
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error_count += 1
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if error_count >= retry:
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self.abort(timeout=timeout)
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log.warning("EOT was not ACKd, transfer aborted")
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return False
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return True
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def recv(self, stream, crc_mode=1, retry=16, timeout=60, delay=1, quiet=0):
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"""
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Receive a stream via the XMODEM protocol.
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>>> stream = file('/etc/issue', 'wb')
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>>> print modem.recv(stream)
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2342
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Returns the number of bytes received on success or ``None`` in case of
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failure.
|
|
"""
|
|
|
|
# initiate protocol
|
|
error_count = 0
|
|
char = 0
|
|
cancel = 0
|
|
while True:
|
|
# first try CRC mode, if this fails,
|
|
# fall back to checksum mode
|
|
if error_count >= retry:
|
|
self.abort(timeout=timeout)
|
|
return None
|
|
elif crc_mode and error_count < (retry / 2):
|
|
if not self.putc(CRC):
|
|
time.sleep(delay)
|
|
error_count += 1
|
|
else:
|
|
crc_mode = 0
|
|
if not self.putc(NAK):
|
|
time.sleep(delay)
|
|
error_count += 1
|
|
|
|
char = self.getc(1, timeout)
|
|
if not char:
|
|
error_count += 1
|
|
continue
|
|
elif char == SOH:
|
|
# crc_mode = 0
|
|
break
|
|
elif char == STX:
|
|
break
|
|
elif char == CAN:
|
|
if cancel:
|
|
return None
|
|
else:
|
|
cancel = 1
|
|
else:
|
|
error_count += 1
|
|
|
|
# read data
|
|
error_count = 0
|
|
income_size = 0
|
|
packet_size = 128
|
|
sequence = 1
|
|
cancel = 0
|
|
while True:
|
|
while True:
|
|
if char == SOH:
|
|
packet_size = 128
|
|
break
|
|
elif char == STX:
|
|
packet_size = 1024
|
|
break
|
|
elif char == EOT:
|
|
# We received an EOT, so send an ACK and return the received
|
|
# data length
|
|
self.putc(ACK)
|
|
return income_size
|
|
elif char == CAN:
|
|
# cancel at two consecutive cancels
|
|
if cancel:
|
|
return None
|
|
else:
|
|
cancel = 1
|
|
else:
|
|
if not quiet:
|
|
print("recv ERROR expected SOH/EOT, got", ord(char), file=sys.stderr)
|
|
error_count += 1
|
|
if error_count >= retry:
|
|
self.abort()
|
|
return None
|
|
# read sequence
|
|
error_count = 0
|
|
cancel = 0
|
|
seq1 = ord(self.getc(1))
|
|
seq2 = 0xFF - ord(self.getc(1))
|
|
if seq1 == sequence and seq2 == sequence:
|
|
# sequence is ok, read packet
|
|
# packet_size + checksum
|
|
data = self.getc(packet_size + 1 + crc_mode, timeout)
|
|
if crc_mode:
|
|
csum = (ord(data[-2]) << 8) + ord(data[-1])
|
|
data = data[:-2]
|
|
log.debug("CRC (%04x <> %04x)" % (csum, self.calc_crc(data)))
|
|
valid = csum == self.calc_crc(data)
|
|
else:
|
|
csum = data[-1]
|
|
data = data[:-1]
|
|
log.debug(
|
|
"checksum (checksum(%02x <> %02x)" % (ord(csum), self.calc_checksum(data))
|
|
)
|
|
valid = ord(csum) == self.calc_checksum(data)
|
|
|
|
# valid data, append chunk
|
|
if valid:
|
|
income_size += len(data)
|
|
stream.write(data)
|
|
self.putc(ACK)
|
|
sequence = (sequence + 1) % 0x100
|
|
char = self.getc(1, timeout)
|
|
continue
|
|
else:
|
|
# consume data
|
|
self.getc(packet_size + 1 + crc_mode)
|
|
self.debug("expecting sequence %d, got %d/%d" % (sequence, seq1, seq2))
|
|
|
|
# something went wrong, request retransmission
|
|
self.putc(NAK)
|
|
|
|
def calc_checksum(self, data, checksum=0):
|
|
"""
|
|
Calculate the checksum for a given block of data, can also be used to
|
|
update a checksum.
|
|
|
|
>>> csum = modem.calc_checksum('hello')
|
|
>>> csum = modem.calc_checksum('world', csum)
|
|
>>> hex(csum)
|
|
'0x3c'
|
|
|
|
"""
|
|
return (sum(map(ord, data)) + checksum) % 256
|
|
|
|
def calc_crc(self, data, crc=0):
|
|
"""
|
|
Calculate the Cyclic Redundancy Check for a given block of data, can
|
|
also be used to update a CRC.
|
|
|
|
>>> crc = modem.calc_crc('hello')
|
|
>>> crc = modem.calc_crc('world', crc)
|
|
>>> hex(crc)
|
|
'0xd5e3'
|
|
|
|
"""
|
|
for char in data:
|
|
crc = (crc << 8) ^ self.crctable[((crc >> 8) ^ int(char)) & 0xFF]
|
|
return crc & 0xFFFF
|
|
|
|
|
|
XMODEM1k = partial(XMODEM, mode="xmodem1k")
|
|
|
|
|
|
def run():
|
|
import optparse
|
|
import subprocess
|
|
|
|
parser = optparse.OptionParser(usage="%prog [<options>] <send|recv> filename filename")
|
|
parser.add_option("-m", "--mode", default="xmodem", help="XMODEM mode (xmodem, xmodem1k)")
|
|
|
|
options, args = parser.parse_args()
|
|
if len(args) != 3:
|
|
parser.error("invalid arguments")
|
|
return 1
|
|
|
|
elif args[0] not in ("send", "recv"):
|
|
parser.error("invalid mode")
|
|
return 1
|
|
|
|
def _func(so, si):
|
|
import select
|
|
import subprocess
|
|
|
|
print("si", si)
|
|
print("so", so)
|
|
|
|
def getc(size, timeout=3):
|
|
w, t, f = select.select([so], [], [], timeout)
|
|
if w:
|
|
data = so.read(size)
|
|
else:
|
|
data = None
|
|
|
|
print("getc(", repr(data), ")")
|
|
return data
|
|
|
|
def putc(data, timeout=3):
|
|
w, t, f = select.select([], [si], [], timeout)
|
|
if t:
|
|
si.write(data)
|
|
si.flush()
|
|
size = len(data)
|
|
else:
|
|
size = None
|
|
|
|
print("putc(", repr(data), repr(size), ")")
|
|
return size
|
|
|
|
return getc, putc
|
|
|
|
def _pipe(*command):
|
|
pipe = subprocess.Popen(command, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
|
|
return pipe.stdout, pipe.stdin
|
|
|
|
if args[0] == "recv":
|
|
import io
|
|
|
|
getc, putc = _func(*_pipe("sz", "--xmodem", args[2]))
|
|
stream = open(args[1], "wb")
|
|
xmodem = XMODEM(getc, putc, mode=options.mode)
|
|
status = xmodem.recv(stream, retry=8)
|
|
stream.close()
|
|
|
|
elif args[0] == "send":
|
|
getc, putc = _func(*_pipe("rz", "--xmodem", args[2]))
|
|
stream = open(args[1], "rb")
|
|
xmodem = XMODEM(getc, putc, mode=options.mode)
|
|
status = xmodem.send(stream, retry=8)
|
|
stream.close()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
sys.exit(run())
|