針對嵌入式系統的telnet登錄系統

純命令寫成，可以記錄登錄時間與用戶，二次開發空間大，需busybox與ash的支持，話不多說直接上腳本：

登錄腳本(login.sh):

#!/bin/ash

cname=$(cat /etc/telnet.cfg | grep username)
cpwd=$(cat /etc/telnet.cfg | grep passwd)
#/etc/telnet.cfg可修改，與createconfig創建的保持一致即可
echo "---------"  >> /tmp/telnetLOG
echo "有新登錄請求！時間:" >> /tmp/telnetLOG
uptime >> /tmp/telnetLOG
read -p "login: " username
echo "用戶:"$username >> /tmp/telnetLOG
if [ "$cname" = "username $username" ]
then
  read -p "Password:" passwd
  if [ "$cpwd" = "passwd $passwd" ]
  then
    echo "登錄成功！" >> /tmp/telnetLOG
    /bin/ash --login
  else
    echo Error!
    #可自定義顯示內容
fi
else
echo Error!
fi

更換密碼腳本(changepasswd.sh):

#!/bin/ash
cname=$(cat /etc/telnet.cfg | grep username)
cpwd=$(cat /etc/telnet.cfg | grep passwd)
echo "Changing telnet passwd..."
read -p "Old Passwd: " tpwd
read -p "New Passwd: " npwd
if [ "passwd $tpwd" = "$cpwd" ]
then
rm /etc/telnet.cfg
touch /etc/telnet.cfg
echo "$cname" >/etc/telnet.cfg
echo "passwd $npwd" >>/etc/telnet.cfg
chown root /etc/telnet.cfg
chmod 000 /etc/telnet.cfg
chmod +r /etc/telnet.cfg
chmod +w /etc/telnet.cfg
#上方四行如為單用戶系統(即只有root可登陸)可以洗掉
else
echo "Error!"
#可定制顯示內容
fi

創建組態檔腳本(createconfig.sh):

#!/bin/ash
echo "Changing telnet config..."
if [ "$(cat /etc/telnet.cfg 2>/dev/null)"x != "x" ]
then
echo "passwd file already exists"
else
read -p "Username: " uname
read -p "Passwd: " upwd
#檔案地址可修改,與其他腳本保持一致
rm /etc/telnet.cfg
echo "username $uname" >/etc/telnet.cfg
echo "passwd $upwd" >>/etc/telnet.cfg
chown root /etc/telnet.cfg
chmod 000 /etc/telnet.cfg
chmod +r /etc/telnet.cfg
chmod +w /etc/telnet.cfg
#同樣如為單用戶可洗掉
fi

查看日志腳本(showlog.sh):

#!/bin/ash
cat /tmp/telnetLOG

清除日志腳本(clearlog.sh):

#!/bin/ash
cpwd=$(cat /etc/telnet.cfg | grep passwd)
read -p "input:" passwd
if [ "passwd $passwd" = "$cpwd" ]
then
  rm /tmp/telnetLOG
  touch /tmp/telnetLOG
  chown root /etc/telnet.cfg
  chmod 000 /etc/telnet.cfg
  chmod +r /etc/telnet.cfg
  chmod +w /etc/telnet.cfg
else
  echo Error!
fi

一鍵安裝腳本(install.sh):

#!/bin/ash
busybox=$(which busybox)
#下方代碼塊如果確定有ln和whoami可洗掉
for i in ln whoami
do
if [ "$(which $i)"x = "x" ]
then
busybox ln -s $busybox /bin/$i
fi
done
ifroot=$(whoami)
if [ "$ifroot" = "root" ]
then
echo "1.復制所有檔案到/bin下..."
#cp /bin/login.sh /bin/logib.sh.bak
rm /bin/login.sh
#如/bin下真的有login.sh請洗掉上方注釋
cp *.sh /bin
echo "2.創建必須檔案鏈接(可能出現報錯請忽略)"
#如確信下方軟體都存在可直接洗掉
for file in cp rm ln whoami chmod which grep uptime chown touch
do
if [ "$(which $file)"x = "x" ]
then
ln -s $busybox /bin/$file
fi
done
  if [ "$(which telnetd)"x = "x" ]
  then
  echo "你沒有telnetd...正從busybox復制(如果支持)"
  ln -s $busybox /bin/telnetd
  else
  echo "找到telnetd..."
  fi
echo "3.給主程式可執行權限"
chmod +x /bin/*.sh
echo "4.配置"
/bin/createconfig.sh
echo "5.啟動telnetd"
$(which telnetd) -l /bin/login.sh
echo "如果需要將telnetd加入啟動串列請按1,其他鍵即跳過"
  read -p "choise: " rc
  if [ "$rc" = "1" ]
then
  echo "$(which telnetd) -l /bin/login.sh" > /etc/init.d/telnetd
  ln -s /etc/init.d/telnetd /etc/rc.d/S50telnet
  #請確保系統使用rc.d而不是rc*.d 如是請自行修改.
else
  echo "已跳過……"
fi
echo "安裝完成！"
rm /bin/install.sh
else
echo "請使用root用戶打開或檢查報錯資訊！"
fi

下載:藍奏云

標籤：嵌入式

上一篇：白話linux作業系統原理

下一篇：基礎夯實：作業系統