[英]How do I implement a raw frame capture using Python 3.3?
注意:我不確定這是編程問題還是硬件/操作系統特定的相關問題。
我正在嘗試使用Python 3.3的套接字類捕獲原始以太網幀。 直接從PyDoc網站查看示例:
import socket
import struct
# CAN frame packing/unpacking (see 'struct can_frame' in <linux/can.h>)
can_frame_fmt = "=IB3x8s"
can_frame_size = struct.calcsize(can_frame_fmt)
def build_can_frame(can_id, data):
can_dlc = len(data)
data = data.ljust(8, b'\x00')
return struct.pack(can_frame_fmt, can_id, can_dlc, data)
def dissect_can_frame(frame):
can_id, can_dlc, data = struct.unpack(can_frame_fmt, frame)
return (can_id, can_dlc, data[:can_dlc])
# create a raw socket and bind it to the 'vcan0' interface
s = socket.socket(socket.AF_CAN, socket.SOCK_RAW, socket.CAN_RAW)
s.bind(('vcan0',))
while True:
cf, addr = s.recvfrom(can_frame_size)
print('Received: can_id=%x, can_dlc=%x, data=%s' % dissect_can_frame(cf))
try:
s.send(cf)
except OSError:
print('Error sending CAN frame')
try:
s.send(build_can_frame(0x01, b'\x01\x02\x03'))
except OSError:
print('Error sending CAN frame')
我收到以下錯誤:
OSError:[Errno 97]協議不支持地址族。
在此特定行中斷:
s = socket.socket(socket.AF_CAN, socket.SOCK_RAW, socket.CAN_RAW)
我對代碼所做的唯一更改是實際的接口名稱(即'em1')。 我正在使用Fedora 15。
進一步研究Python源代碼, 似乎 AF_CAN(地址族)和CAN_RAW(協議)不是正確的對。
如何捕獲原始以太網幀以進行進一步處理?
最終,我需要做的是捕獲原始的以太網幀,並在將其進入系統時對其進行處理。
我終於可以做到以下幾點:
import socket
import struct
import time
s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.ntohs(0x0003))
test = []
while(1):
now = time.time()
message = s.recv(4096)
# Process the message from here
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