如果检测到错误的密码，则 wpa_supplicant 结束进程

Question

通常当我运行时，wpa_supplicant我会得到一些这样的输出：

Successfully initialized wpa_supplicant
ioctl[SIOCSIWAP]: Operation not permitted
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument
wlan3: Trying to associate with 9c:3d:cf:fb:95:96 (SSID='Bell420' freq=2462 MHz)
wlan3: Association request to the driver failed
wlan3: Associated with 9c:3d:cf:fb:95:96
wlan3: Authentication with 9c:3d:cf:fb:95:96 timed out.
ioctl[SIOCSIWAP]: Operation not permitted
wlan3: CTRL-EVENT-DISCONNECTED bssid=9c:3d:cf:fb:95:96 reason=3 locally_generated=1
wlan3: WPA: 4-Way Handshake failed - pre-shared key may be incorrect

问题是它只是一遍又一遍地尝试。

有没有一种方法可以告诉我wpa_supplicant在出现明显错误（例如错误的键）时立即退出？

我使用的是带有wpa_supplicant v2.1.

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我写了一个解决方法来监视wpa_supplicant不正确的密钥。使用grep上wpa_supplicant（与stdbuf基于斯特凡Chazelas'在这里评论）：

  # Create conf file with ssid and password
  wpa_passphrase "$ssid" "$password" > /etc/wpa_supplicant/wpa_supplicant.conf

  # If wifi key is wrong kill subshell
  subshell=$BASHPID
  (sudo stdbuf -o0 wpa_supplicant -Dwext -iwlan1 -c/etc/wpa_supplicant/wpa_supplicant.conf 2>&1 \
    | grep -m 1 "pre-shared key may be incorrect" \
    && kill -s PIPE "$subshell") &

注意：上面的块位于脚本的子shell 中。

它最初似乎有效，但随着时间的推移，我发现有时当密码正确时它会导致整个脚本失败。其他时候它会按预期工作。

必须有更好的方法来做到这一点。

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编辑：也许我应该在wpa_cli这里使用？

Answer 1

#!/bin/bash

# SSID and password
ssid="YourSSID"
password="YourPassword"

# Create wpa_supplicant.conf
wpa_passphrase "$ssid" "$password" > /etc/wpa_supplicant/wpa_supplicant.conf

# Run wpa_supplicant in the background
wpa_supplicant -Dwext -iwlan1 -c/etc/wpa_supplicant/wpa_supplicant.conf > /tmp/wpa_supplicant.log 2>&1 &

# Monitor log file for error messages
tail -f /tmp/wpa_supplicant.log | while read -r line; do
    if [[ $line == *"pre-shared key may be incorrect"* ]]; then
        echo "Incorrect key detected. Exiting..."
        kill $!
    fi
done

wpa_supplicant在后台运行，其输出被重定向到日志文件。该tail命令连续读取日志文件并检查指定的错误消息。如果发现错误消息，它会打印一条消息并通过终止进程来终止脚本wpa_supplicant。