编写外部程序以与wpa_supplicant接口

Question

我需要直接与Python中的wpa_请求者进行交互。据我所知，可以使用Unix套接字和wpa_请求控制接口（https://w1.fi/wpa_supplicant/devel/ctrl_iface_page.html）连接到wpa_请求。 我编写了一个发送PING命令的简单程序：

import socket

CTRL_SOCKETS = "/home/victor/Research/wpa_supplicant_python/supplicant_conf"
INTERFACE = "wlx84c9b281aa80"
SOCKETFILE = "{}/{}".format(CTRL_SOCKETS, INTERFACE)

s = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
s.connect(SOCKETFILE)
s.send(b'PING')
while 1:
    data = s.recv(1024)
    if data:
        print(repr(data))

但当我运行它时，wpa_恳求者报告了一个错误：

wlx84c9b281aa80: ctrl_iface sendto failed: 107 - Transport endpoint is not connected

有人能举个例子，你如何进行“扫描”，然后打印“扫描结果”吗

Answer 1

显然，wpa_Suplicant使用的套接字类型（UNIX数据报）没有为服务器提供任何回复方式。有a few ways to get around that。wpa_恳求者似乎特别支持通过单独的套接字（在每条消息末尾附加的路径中找到）进行回复

奇怪的是，这似乎是Linux中比较常见的做法：/dev/log seems to work in the same way

以下是一个满足您要求的程序：

import socket, os
from time import sleep

def sendAndReceive(outmsg, csock, ssock_filename):
  '''Sends outmsg to wpa_supplicant and returns the reply'''

  # the return socket object can be used to send the data
  # as long as the address is provided
  csock.sendto(str.encode(outmsg), ssock_filename)

  (bytes, address) = csock.recvfrom(4096)
  inmsg = bytes.decode('utf-8')

  return inmsg

wpasock_file = '/var/run/wpa_supplicant/wlp3s0'
retsock_file = '/tmp/return_socket'

if os.path.exists(retsock_file):
  os.remove(retsock_file)
retsock = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
retsock.bind(retsock_file)

replyToScan = sendAndReceive('SCAN', retsock, wpasock_file)
print(f'SCAN: {replyToScan}')

sleep(5)

replyToScanResults = sendAndReceive('SCAN_RESULTS', retsock, wpasock_file)
print(f'SCAN_RESULTS: {replyToScanResults}')

retsock.close()
os.remove(retsock_file)