[英]Linux [Errno 13] Permission denied
我有一个 python 脚本可以在 Windows 上运行,但很难在 Ubuntu 桌面上运行它。 这里没有很多智慧,任何提示都非常感谢......
测试.py
#!/usr/bin/env python3
"""
https://pymodbustcp.readthedocs.io/en/latest/examples/server_allow.html
An example of Modbus/TCP server which allow modbus read and/or write only from
specific IPs.
Run this as root to listen on TCP privileged ports (<= 1024).
"""
import argparse
from pyModbusTCP.server import ModbusServer, DataHandler
from pyModbusTCP.constants import EXP_ILLEGAL_FUNCTION
# some const
ALLOW_R_L = ['127.0.0.1', '192.168.0.104']
ALLOW_W_L = ['127.0.0.1']
# a custom data handler with IPs filter
class MyDataHandler(DataHandler):
def read_coils(self, address, count, srv_info):
if srv_info.client.address in ALLOW_R_L:
return super().read_coils(address, count, srv_info)
else:
return DataHandler.Return(exp_code=EXP_ILLEGAL_FUNCTION)
def read_d_inputs(self, address, count, srv_info):
if srv_info.client.address in ALLOW_R_L:
return super().read_d_inputs(address, count, srv_info)
else:
return DataHandler.Return(exp_code=EXP_ILLEGAL_FUNCTION)
def read_h_regs(self, address, count, srv_info):
if srv_info.client.address in ALLOW_R_L:
return super().read_h_regs(address, count, srv_info)
else:
return DataHandler.Return(exp_code=EXP_ILLEGAL_FUNCTION)
def read_i_regs(self, address, count, srv_info):
if srv_info.client.address in ALLOW_R_L:
return super().read_i_regs(address, count, srv_info)
else:
return DataHandler.Return(exp_code=EXP_ILLEGAL_FUNCTION)
def write_coils(self, address, bits_l, srv_info):
if srv_info.client.address in ALLOW_W_L:
return super().write_coils(address, bits_l, srv_info)
else:
return DataHandler.Return(exp_code=EXP_ILLEGAL_FUNCTION)
def write_h_regs(self, address, words_l, srv_info):
if srv_info.client.address in ALLOW_W_L:
return super().write_h_regs(address, words_l, srv_info)
else:
return DataHandler.Return(exp_code=EXP_ILLEGAL_FUNCTION)
if __name__ == '__main__':
# parse args
parser = argparse.ArgumentParser()
parser.add_argument('-H', '--host', type=str, default='localhost', help='Host (default: localhost)')
parser.add_argument('-p', '--port', type=int, default=502, help='TCP port (default: 502)')
args = parser.parse_args()
# init modbus server and start it
server = ModbusServer(host=args.host, port=args.port, data_hdl=MyDataHandler())
server.start()
当我从 SSH 运行它时,我得到:
Traceback (most recent call last):
File "/home/ben/anaconda3/lib/python3.7/site-packages/pyModbusTCP/server.py", line 989, in start
self._service.server_bind()
File "/home/ben/anaconda3/lib/python3.7/socketserver.py", line 466, in server_bind
self.socket.bind(self.server_address)
PermissionError: [Errno 13] Permission denied
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "test.py", line 69, in <module>
server.start()
File "/home/ben/anaconda3/lib/python3.7/site-packages/pyModbusTCP/server.py", line 992, in start
raise ModbusServer.NetworkError(e)
pyModbusTCP.server.NetworkError: [Errno 13] Permission denied
如果我在目录上执行ls -la
:
total 12
drwxrwxr-x 2 ben ben 4096 Aug 7 10:57 .
drwxr-xr-x 5 ben ben 4096 Aug 7 10:50 ..
-rw-rw-r-- 1 ben ben 2522 Aug 7 10:54 test.py
在基于 Unix 的环境(Linux 等)中,1024 及以下的 TCP 端口被视为特权。 这有历史原因,因为内部服务在低端口上运行(即 sshd 在端口 22 上)。
您有两种方法可以解决此问题:
bind
到默认端口 502。-p
或--port
命令行选项运行以指定 1025 或更大的端口。 这些端口不需要 root 权限。您正在使用哪个用户运行脚本?
为了不将用户更改为 root,您可以通过在命令开头键入 sudo 来运行脚本来进行测试。
Example
sudo python3 script.py
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