Shell

Question

这是我现在的服务器代码。我只想从客户那里获取数据，对其进行分析并发送我的答案。有没有办法在 nc 中调用我的函数 managedata()？我的代码，显然不起作用。

server.sh:

managedata()
{
echo 
#do something with data
return 
}

listen()
{
echo "Server listening.."
nc -l -p 1234 -c '$(read i && managedata $i && echo $?)'
}

#MAIN
while true;
do
listen
done

Client.sh:

send()
{
echo  | nc $ip $port -o 0
}

#
register()
{
read -p "Login: " usrname
echo -n "Password: "
read -s password | shasum > password

#Schleife zum encrypten des Passworts
#Count = n -> Leslie Lamport Alogrithmus
n=5
count=$n
while [ $count -ge 2 ]
do
    password="$(cat password | shasum)"
    ((count--))
done

password=`cat password`
echo
echo $password

data="reg-$usrname-$n-$password"

send $data
}

#
log()
{
echo "..."
}

#
menue()
{
echo "====== Lab: Shell Programming (BS) ======"
echo "  r   Register"
echo "  l   Login"
echo "  q   Quit"
echo

read -p "your choice: " check

case "$check" in
    r) register;;
    l) log;;
    q) exit;;
esac

}


#MAIN
ip=
port=

while true
do
menue
done

bash-xserver.sh:

+ true
+ listen
+ echo 'Server listening..'
Server listening..
+ nc -l -p 1234 -c '$(read i && managedata $i && echo $?)'
sh: 1: managedata: not found
+ true
+ listen
+ echo 'Server listening..'
Server listening..
+ nc -l -p 1234 -c '$(read i && managedata $i && echo $?)'

Answer 1

是的，您应该 "tell" bash 将 managedata 视为可以执行的命令或函数。顺便说一句，你需要使用 $() 来执行整个表达式，而不仅仅是 managedata:

nc -l -p 1234 -c $(read i && managedata $i && echo $?)

另外 bash 不能 return 字符串，只能是整数错误代码，所以如果它不是 0 - 255 范围内的整数，return 将不起作用。

替换为return 0

Shell - 使用 nc -c 调用函数

Shell - calling function with nc -c

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