Configuração do Iptables em modo texto.

Publicado por Marcos Vettorazzo 08/06/2005

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Esse é o meu pimeiro script. Nasceu a parti de uma necessidade.
Ele foi quase q 100% baseado no do Morimoto que acompanha o kurumin, inclusive várias partes do código foram apenas copiadas.
Dicas e sugestões seram SEMPRE muito bem recebidas. Se em alguma parte dele deixei de mencionar algo, por favor me avisem.
Ele cria um arquivo chamado firewaal.conf no diretório onde foi executado contendo as regras e depois copia para a pasta /usr/local/bin renomeando como firewall.
Aguardo sua avaliação.

  



Esconder código-fonte

#!/bin/bash
# Testa se o usuário corrente é o ROOT


echo -e "{FONTE}33[01;34m##########################################################"
echo -e "{FONTE}33[01;34m## {FONTE}33[01;37mScript de configuração do firewall do linux          {FONTE}33[01;34m##" 
echo -e "{FONTE}33[01;34m## {FONTE}33[01;37mEscrito por:                                         {FONTE}33[01;34m##"
echo -e "{FONTE}33[01;34m##        {FONTE}33[01;32mMarcos Vettorazzo -  {FONTE}33[01;31mkarioka_pr@brasnet.org   {FONTE}33[01;34m##"
echo -e "{FONTE}33[01;34m##########################################################{FONTE}33[01;37m"
echo " "
echo -e "{FONTE}33[01;34m(Enter para continuar){FONTE}33[01;37m"
read pausa
clear


if [ $USER != root ]
then
echo -e "{FONTE}33[01;31m#######################################################################{FONTE}33[01;31m"
echo -e "{FONTE}33[01;31m##   Voce precisa estar logado como root para executar este script   ##\n##   Se você não tem a senha entre em contato com o administrador.   ##{FONTE}33[01;37m"
echo -e "{FONTE}33[01;31m#######################################################################{FONTE}33[01;37m"
else
if [ $USER = root ]
then
echo -e "{FONTE}33[01;34m#######################{FONTE}33[01;34m"
echo -e "{FONTE}33[01;34m## Ok, você é o root ##{FONTE}33[01;34m"
echo -e "{FONTE}33[01;34m#######################{FONTE}33[01;37m"
echo -e " "
echo -e "{FONTE}33[01;34m(Enter para continuar){FONTE}33[01;37m"
read pausa
clear


rm -f /usr/local/bin/firewall
rm -f firewall.conf
echo -e '#!/bin/bash' >> firewall.conf
echo ' ' >> firewall.conf

echo -e '# Script de configuração do iptables' >> firewall.conf
echo -e '# Este script pode ser usado em qualquer distribuiçõa Linux que utilize o Kernel 2.4 em diante' >> firewall.conf
echo -e '# Por Marcos Vettorazzo - karioka_pr@brasnet.org' >> firewall.conf
echo -e '# Este script foi feito com base no script do Carlos Morimoto, criador do Kurumin Linux' >> firewall.conf
echo -e ' ' >> firewall.conf
echo ' ' >> firewall.conf

# Limpa as regras do iptables e desativa o firewall antes de começar a configuração:

iptables -F
echo -e "{FONTE}33[01;32m#####################################################################{FONTE}33[01;32m"
echo -e "{FONTE}33[01;32m## Você quer que o firewall permita conexões vindas da rede local? ##{FONTE}33[01;32m"
echo -e "{FONTE}33[01;32m##    Isso permite a utilização de serviços como compartilhamento  ##{FONTE}33[01;32m"
echo -e "{FONTE}33[01;32m##           de arquivos/impressoras e também de internet.         ##{FONTE}33[01;32m"
echo -e "{FONTE}33[01;32m##             Responda com sim ou nao(sem acento mesmo)           ##{FONTE}33[01;32m"
echo -e "{FONTE}33[01;32m#####################################################################{FONTE}33[01;37m"
echo -e " "
read resp
case "$resp" in
  'sim' )
      echo -e ""
      echo -e "{FONTE}33[01;32m###################################################################{FONTE}33[01;32m"
      echo -e "{FONTE}33[01;32m##          Qual a faixa de IP utilizada em sua rede??           ##\n##                        Ex.: 192.168.1.0                       ##{FONTE}33[01;32m";
      echo -e "{FONTE}33[01;32m###################################################################{FONTE}33[01;37m"
      echo -e " "
      read faixaip
      echo -e '# Abre para uma faixa de endereços da rede local' >> firewall.conf
      echo -e "iptables -A INPUT -p tcp --syn -s $faixaip/255.255.255.0 -j ACCEPT" >> firewall.conf
      echo -e ' ' >> firewall.conf
     ;;
  'nao' )
      echo " "
      echo -e "{FONTE}33[01;34mOk...{FONTE}33[01;37m"
     ;;
   * )
      echo -e "{FONTE}33[01;31m######################{FONTE}33[01;31m"
      echo -e "{FONTE}33[01;31m##  Opção inválida  ##{FONTE}33[01;31m"
      echo -e "{FONTE}33[01;31m######################{FONTE}33[01;37m"
      echo " "
      echo -e "{FONTE}33[01;32m###################################################################{FONTE}33[01;32m"
      echo -e "{FONTE}33[01;32m##            Responda com sim ou nao(sem acento mesmo)          ##{FONTE}33[01;32m"
      echo -e "{FONTE}33[01;32m###################################################################{FONTE}33[01;37m"
      echo " "
      read resp
       if [ $resp = sim ]
          then
   echo -e "{FONTE}33[01;32m###################################################################{FONTE}33[01;32m"
      echo -e "{FONTE}33[01;32m##          Qual a faixa de IP utilizada em sua rede??           ##\n##                        Ex.: 192.168.1.0                       ##{FONTE}33[01;32m";
      echo -e "{FONTE}33[01;32m###################################################################{FONTE}33[01;37m"
      echo -e " "
        read faixaip
   echo -e '# Abre para uma faixa de endereços da rede local' >> firewall.conf
        echo -e "iptables -A INPUT -p tcp --syn -s $faixaip/255.255.255.0 -j ACCEPT" >> firewall.conf
   echo -e ' ' >> firewall.conf
        else
   if [ $resp = nao ]
   then
   echo " "
        echo -e "{FONTE}33[01;34mOk...{FONTE}33[01;37m"
   fi
   fi
     ;;
esac 
echo -e " "
echo -e "{FONTE}33[01;32m###################################################################{FONTE}33[01;32m"
echo -e "##            Você quer abrir alguma porta específica?           ##\n##        No caso de algum servidor como FTP, SSh ou WEB.        ##"
echo -e "##    Não esqueça que as respostas são sim ou nao(sem acento)    ##"
echo -e "{FONTE}33[01;32m###################################################################{FONTE}33[01;37m"
echo -e " "
read resp
porta="1"
case "$resp" in
   'sim' )
   echo -e " "
   echo -e "{FONTE}33[01;32m###################################################################{FONTE}33[01;32m"
   echo -e "##             Qual porta você deseja deixar aberta?             ##\n##  Elas serão adicionadas uma a uma, para parar indique 0(zero) ##"
   echo -e "{FONTE}33[01;32m###################################################################{FONTE}33[01;37m"
   echo -e " "
     while [ $porta -ne 0 ]
      do
      echo -e "{FONTE}33[01;32m#######################################{FONTE}33[01;32m"
      echo -e "##  Qual a porta? Varia de 1 à 65550 ##"
      echo -e "{FONTE}33[01;32m#######################################{FONTE}33[01;37m"
      echo -e " "
      read porta
      if [ $porta -gt 0 ]
      then
      echo '# Abre a porta' $porta '(inclusive para a Internet)' >> firewall.conf
      echo "iptables -A INPUT -p tcp --destination-port $porta -j ACCEPT" >> firewall.conf
      echo -e ' ' >> firewall.conf
      else
      break
      fi
      done;
      
      ;;
    'nao' )
       echo " "
       echo -e "{FONTE}33[01;34mOk...{FONTE}33[01;37m"
     ;;
     * )
     echo -e "Opção inválida. Responda sim ou nao(sem acento)"
     ;;
     esac

 
#Proteções diversas


echo " " >> firewall.conf
echo '# Ignora pings' >> firewall.conf 
echo 'echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_all' >> firewall.conf 
echo " " >> firewall.conf 

echo '# Protege contra synflood' >> firewall.conf 
echo 'echo "1" > /proc/sys/net/ipv4/tcp_syncookies' >> firewall.conf 
echo " " >> firewall.conf 

echo "# Proteção contra ICMP Broadcasting " >> firewall.conf
echo 'echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts' >> firewall.conf
echo " " >> firewall.conf

echo '# Bloqueia traceroute' >> firewall.conf
echo 'iptables -A INPUT -p udp --dport 33435:33525 -j DROP' >> firewall.conf
echo " " >> firewall.conf

echo " " >> firewall.conf
echo '# Proteções diversas contra portscanners, ping of death, ataques DoS, etc.' >> firewall.conf
echo 'iptables -A FORWARD -p icmp --icmp-type echo-request -m limit --limit 1/s -j ACCEPT' >> firewall.conf
echo 'iptables -A FORWARD -p tcp -m limit --limit 1/s -j ACCEPT' >> firewall.conf
echo 'iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT' >> firewall.conf
echo 'iptables -A FORWARD -p tcp --tcp-flags SYN,ACK,FIN,RST RST -m limit --limit 1/s -j ACCEPT' >> firewall.conf
echo 'iptables -A FORWARD --protocol tcp --tcp-flags ALL SYN,ACK -j DROP' >> firewall.conf
echo 'iptables -A FORWARD -m unclean -j DROP' >> firewall.conf
echo 'iptables -A INPUT -m state --state INVALID -j DROP' >> firewall.conf
echo 'iptables -N VALID_CHECK' >> firewall.conf
echo 'iptables -A VALID_CHECK -p tcp --tcp-flags ALL FIN,URG,PSH -j DROP' >> firewall.conf
echo 'iptables -A VALID_CHECK -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j DROP' >> firewall.conf
echo 'iptables -A VALID_CHECK -p tcp --tcp-flags ALL ALL -j DROP' >> firewall.conf
echo 'iptables -A VALID_CHECK -p tcp --tcp-flags ALL FIN -j DROP' >> firewall.conf
echo 'iptables -A VALID_CHECK -p tcp --tcp-flags SYN,RST SYN,RST -j DROP' >> firewall.conf
echo 'iptables -A VALID_CHECK -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP' >> firewall.conf
echo 'iptables -A VALID_CHECK -p tcp --tcp-flags ALL NONE -j DROP' >> firewall.conf
echo " " >> firewall.conf

# Abre para a interface de loopback

echo " " >> firewall.conf
echo '# Abre para a interface de loopback.' >> firewall.conf 
echo '# Esta regra é essencial para o KDE e outros programas gráficos funcionarem adequadamente.' >> firewall.conf 
echo 'iptables -A INPUT -p tcp --syn -s 127.0.0.1/255.0.0.0 -j ACCEPT' >> firewall.conf
echo 'iptables -A INPUT -i lo -j ACCEPT' >> firewall.conf
echo " " >> firewall.conf

# Fecha as portas udp de 1 a 1024, abre para o localhost

echo " " >> firewall.conf
echo '# Fecha as portas udp de 1 a 1024, abre para o localhost' >> firewall.conf
echo 'iptables -A INPUT -p udp -s 127.0.0.1/255.0.0.0 -j ACCEPT' >> firewall.conf
echo 'iptables -A INPUT -p udp --dport 1:1024 -j DROP' >> firewall.conf
echo 'iptables -A INPUT -p udp --dport 59229 -j DROP' >> firewall.conf
echo " " >> firewall.conf
echo -e " "
echo -e "{FONTE}33[01;32m#####################################################{FONTE}33[01;32m"
echo -e "## Gostaria de acessar as configurações avançadas? ##"
echo -e "{FONTE}33[01;32m#####################################################{FONTE}33[01;37m"
echo -e " "
read resp

if [ $resp = sim ] ; then

# Sim, Comandos

clear
echo -e "{FONTE}33[01;32m######################################################################{FONTE}33[01;32m"
echo "## Qual é a sua interface de rede que está conectada na rede local? ##"
echo -e "{FONTE}33[01;32m######################################################################{FONTE}33[01;37m"
echo -e " "
echo -e "{FONTE}33[01;32m##############"
echo "## ex: eth1 ##"
echo -e "{FONTE}33[01;32m##############{FONTE}33[01;37m"
echo -e " "
read iflocal
echo -e " "
echo -e "{FONTE}33[01;32m######################################################################{FONTE}33[01;32m"
echo "##  Qual é a interface conectada na internet? Se você acessa via    ##"
echo "##  ADSL PPPOE ou modem ela é a ppp0. Em caso de dúvida rode o      ##"
echo "##  comando ifconfig                                                ##"
echo -e "{FONTE}33[01;32m######################################################################{FONTE}33[01;37m"
echo -e " "
echo -e "{FONTE}33[01;32m##############{FONTE}33[01;32m"
echo "## ex: ppp0 ##"
echo -e "{FONTE}33[01;32m##############{FONTE}33[01;37m"
echo -e " "
read ifinternet

continuar=0
parar=1

while [ "$continuar" -lt "$parar" ]
do

 clear
 echo -e
 echo -e "{FONTE}33[01;32m##############################{FONTE}33[01;32m"
 echo -e "## O que você deseja fazer? ##"
 echo -e "{FONTE}33[01;32###############################{FONTE}33[01;37m"
 echo " "
 echo -e "{FONTE}33[01;32ma) {FONTE}33[01;34mAdicionar uma faixa de endereços para a rede local"
 echo -e "{FONTE}33[01;32mb) {FONTE}33[01;34mAbrir uma porta do firewall"
 echo -e "{FONTE}33[01;32mc) {FONTE}33[01;34mRedirecionar uma faixa de portas para um micro da rede local?"
 echo -e "   {FONTE}33[01;34m(port forward)"
 echo -e "{FONTE}33[01;32md) {FONTE}33[01;34mBloquear uma determinada porta de saída (permite bloquear o "
 echo -e "   {FONTE}33[01;34muso de programas como o ICQ, MSN, etc.)"
 echo -e "{FONTE}33[01;32me) {FONTE}33[01;34mBloquear o uso de programas P2P, (iMesh, BearShare, ToadNotde," 
 echo -e "   {FONTE}33[01;34mWinMX, Napigatorm Morpheus, Limewire e Audiogalaxy)"
 echo -e "{FONTE}33[01;32mf) {FONTE}33[01;34mTerminei! Continuar com a configuração"
 echo " "
 echo -e "{FONTE}33[01;32mEscolha sua opção: ({FONTE}33[01;34ma, b, c, d, e ou f{FONTE}33[01;32m){FONTE}33[01;37m" 
 echo " "

read voufazer



 if [ "$voufazer" = "a" ]; then 
 clear
 echo " "
 echo -e "{FONTE}33[01;32m##############################################################################"
 echo "## Digite a faixa de endereços da rede local seguida da máscara de sub-rede ##"
 echo -e "{FONTE}33[01;32m##############################################################################"
  echo -e "{FONTE}33[01;32m###################################"
 echo -e "## ex: 192.168.2.0/255.255.255.0 ##"
 echo -e "{FONTE}33[01;32m###################################{FONTE}33[01;37m"
 echo " "
 read faixalocal

 echo " "
  
 echo '# Abre para uma faixa de endereços da rede local' >> firewall.conf 
 echo "iptables -A INPUT -p tcp --syn -s $faixalocal -j ACCEPT" >> firewall.conf
 echo " " >> firewall.conf
 
 echo -e "{FONTE}33[01;34m(Enter para continuar){FONTE}33[01;37m"
 read pausa

 fi


 if [ "$voufazer" = "b" ]; then 
 clear

 echo -e "{FONTE}33[01;32m####################################"
 echo -e "## Digite a porta que será aberta ##"
 echo -e "{FONTE}33[01;32m####################################{FONTE}33[01;37m"
 echo " "
 echo -e "{FONTE}33[01;32m#############{FONTE}33[01;37"
 echo -e "## ex: 1080 ##"
 echo -e "{FONTE}33[01;32m#############{FONTE}33[01;37"
 echo " "
 read portaip

 echo '# Abre uma porta (inclusive para a Internet)' >> firewall.conf 
 echo "iptables -A INPUT -p tcp --destination-port $portaip -j ACCEPT" >> firewall.conf
 echo " " >> firewall.conf
 echo -e "{FONTE}33[01;34m(Enter para continuar){FONTE}33[01;37m"
 read pausa

 fi


 if [ "$voufazer" = "c" ]; then 
 clear
 echo -e "{FONTE}33[01;32m#################################################{FONTE}33[01;32m"
 echo -e "## Digite a faixa de portas que será fowardada ##"
 echo -e "{FONTE}33[01;32m#################################################{FONTE}33[01;37m"
  echo -e "{FONTE}33[01;32m###################"
 echo -e "## ex: 7000:7110 ##"
 echo -e "{FONTE}33[01;32m###################{FONTE}33[01;37m"
 
 echo -e " "
 echo -e "{FONTE}33[01;32m#######################################################"
 echo -e "## Para direcionar apenas uma porta apenas repita-a: ##"
 echo -e "#######################################################{FONTE}33[01;37m"
 echo -e "{FONTE}33[01;32m###################"
 echo -e "## ex: 7000:7000 ##"
 echo -e "###################{FONTE}33[01;37m"
 echo -e " "
 read rangeportas
 
 echo -e "{FONTE}33[01;32m#####################################################################"
 echo -e "## Digite o endereço do micro da rede local que receberá as portas ##"
 echo -e "{FONTE}33[01;32m#####################################################################{FONTE}33[01;37m"
  echo -e "{FONTE}33[01;32m#####################"
 echo -e "## ex: 192.168.0.2 ##"
 echo -e "{FONTE}33[01;32m#####################{FONTE}33[01;37m"
 echo " "
 read destinatario


 echo '# Redireciona uma faixa de portas para um micro da rede local' >> firewall.conf 
 echo "iptables -t nat -A PREROUTING -i $ifinternet -p tcp --dport $rangeportas -j DNAT --to-dest $destinatario" >> firewall.conf
 echo "iptables -A FORWARD -p tcp -i $ifinternet --dport $rangeportas -d $destinatario -j ACCEPT" >> firewall.conf
 echo "iptables -t nat -A PREROUTING -i $ifinternet -p udp --dport $rangeportas -j DNAT --to-dest $destinatario" >> firewall.conf
 echo "iptables -A FORWARD -p udp -i $ifinternet --dport $rangeportas -d $destinatario -j ACCEPT" >> firewall.conf
 echo " " >> firewall.conf 
 echo -e "{FONTE}33[01;34m(Enter para continuar){FONTE}33[01;37m"
 read pausa

 fi


 if [ "$voufazer" = "d" ]; then 


 clear
 echo -e "{FONTE}33[01;32m########################################################################"
 echo -e "## Esta opção permite bloquear o uso de uma determinada porta TCP ou, ##"
 echo -e "## UDP, tanto a partir deste micro, quanto a partir de micros da rede ##"
 echo -e "##          local, caso você esteja compartilhando a conexão.         ##"
 echo -e "##   Usando esta opção você pode bloquear o uso de programas como o   ##"
 echo -e "##     ICQ (portas 4000 e 5190), Napster (6699), GNUtella (6346),     ##"
 echo -e "##      AIM (4099), MSN (1863) e assim por diante. Basta saber a      ##"
 echo -e "##                 porta de saída usada pelo programa                 ##"
 echo -e "########################################################################{FONTE}33[01;37m"
 echo " "
 echo -e "{FONTE}33[01;32m########################################################################"
 echo -e "## Você pode também fechar uma faixa de portas, basta digitar a faixa ##"
 echo -e "##                    desejada, como em: 6000:6100                    ##"
 echo -e "########################################################################{FONTE}33[01;37m"
 echo " "
 echo -e "{FONTE}33[01;32m###################################################################"
 echo -e "## Digite a porta de saída ou a faixa de portas que será fechada ##"
 echo -e "##      ex: 1214 (uma porta) ou 6000:6100 (a faixa inteira)      ##"
 echo -e "###################################################################{FONTE}33[01;37m"
 echo  " "
 
 read portaout


 echo '# Bloqueia uma porta de saída, tanto local quanto forward' >> firewall.conf 
 echo "iptables -A OUTPUT -p TCP --dport $portaout -j DROP" >> firewall.conf
 echo "iptables -A FORWARD -p TCP --dport $portaout -j DROP" >> firewall.conf
 echo "iptables -A OUTPUT -p UDP --dport $portaout -j DROP" >> firewall.conf
 echo "iptables -A FORWARD -p UDP --dport $portaout -j DROP" >> firewall.conf
 echo " " >> firewall.conf
 echo -e "{FONTE}33[01;34mAcesse esta opção várias vezes para fechar mais portas."
 echo -e "{FONTE}33[01;34m(Enter para continuar){FONTE}33[01;37m"
 read pausa

 fi



 if [ "$voufazer" = "e" ]; then 

 
 echo " "
 echo -e "{FONTE}33[01;32m############################################################################"
 echo -e "## Esta opção bloqueia as portas usadas pelos programas iMesh, BearShare, ##"
 echo -e "## Esta opção bloqueia as portas usadas pelos programas iMesh, BearShare, ##"
 echo -e "## ToadNotde, WinMX, Napigatorm Morpheus, Kazaa, Limewire e Audiogalaxy,  ##"
 echo -e "##    impedindo que eles sejam usados a partir deste micro ou de outros   ##"
 echo -e "##   micros da rede local, que acessem através deste. (pressione Enter)   ##"
 echo -e "############################################################################{FONTE}33[01;37m"
 
 echo " " >> firewall.conf
 echo '# Bloqueia programas P2P' >> firewall.conf
 echo '#iMesh' >> firewall.conf
 echo 'iptables -A FORWARD -d 216.35.208.0/24 -j REJECT' >> firewall.conf
 echo '#BearShare' >> firewall.conf
 echo 'iptables -A FORWARD -p TCP --dport 6346 -j REJECT' >> firewall.conf
 echo '#ToadNode' >> firewall.conf
 echo 'iptables -A FORWARD -p TCP --dport 6346 -j REJECT' >> firewall.conf
 echo '#WinMX' >> firewall.conf
 echo 'iptables -A FORWARD -d 209.61.186.0/24 -j REJECT' >> firewall.conf
 echo 'iptables -A FORWARD -d 64.49.201.0/24 -j REJECT' >> firewall.conf
 echo '#Napigator' >> firewall.conf
 echo 'iptables -A FORWARD -d 209.25.178.0/24 -j REJECT' >> firewall.conf
 echo '#Morpheus' >> firewall.conf
 echo 'iptables -A FORWARD -d 206.142.53.0/24 -j REJECT' >> firewall.conf
 echo 'iptables -A FORWARD -p TCP --dport 1214 -j REJECT' >> firewall.conf
 echo '#KaZaA' >> firewall.conf
 echo 'iptables -A FORWARD -d 213.248.112.0/24 -j REJECT' >> firewall.conf
 echo 'iptables -A FORWARD -p TCP --dport 1214 -j REJECT' >> firewall.conf
 echo '#Limewire' >> firewall.conf
 echo 'iptables -A FORWARD -p TCP --dport 6346 -j REJECT' >> firewall.conf
 echo '#Audiogalaxy' >> firewall.conf
 echo 'iptables -A FORWARD -d 64.245.58.0/23 -j REJECT' >> firewall.conf
 echo " " >> firewall.conf

 echo -e "{FONTE}33[01;34m(Enter para continuar){FONTE}33[01;37m"
 read pausa

 fi

 if [ "$voufazer" = "f" ]; then 
clear

# Ignora qualquer pacote de entrada, vindo de qualquer endereço, a menos que especificado o contrário acima. Bloqueia tudo.  

echo ' ' >> firewall.conf
echo '# Esta regra é o coração do firewall,' >> firewall.conf
echo '# ela bloqueia qualquer conexão que não tenha sido permitida acima, justamente por isso ela é a última da cadeia.' >> firewall.conf
echo 'iptables -A INPUT -p tcp --syn -j DROP' >> firewall.conf

echo ' ' >> firewall.conf

echo ' ' >> firewall.conf

echo ' ' >> firewall.conf

chmod +x firewall.conf
cp firewall.conf /usr/local/bin/firewall
iptables -F
echo -e "{FONTE}33[01;34mOk... Configuração terminada.{FONTE}33[01;37m"
echo " "
 break
 fi
 
done
 
fi
fi
fi

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