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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<HTML>
<HEAD>
 <META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9">
 <TITLE>VPN HOWTO: ¥¯¥é¥¤¥¢¥ó¥È</TITLE>
 <LINK HREF="VPN-HOWTO-5.html" REL=next>
 <LINK HREF="VPN-HOWTO-3.html" REL=previous>
 <LINK HREF="VPN-HOWTO.html#toc4" REL=contents>
</HEAD>
<BODY>
<A HREF="VPN-HOWTO-5.html">¼¡¤Î¥Ú¡¼¥¸</A>
<A HREF="VPN-HOWTO-3.html">Á°¤Î¥Ú¡¼¥¸</A>
<A HREF="VPN-HOWTO.html#toc4">Ìܼ¡¤Ø</A>
<HR>
<H2><A NAME="s4">4. ¥¯¥é¥¤¥¢¥ó¥È</A></H2>

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¾ï¤Ë¥¢¥¯¥»¥¹¤òµö¤¹¤È¤­¤Ë¤Ï¡¢¤³¤ÎÈ¢¤Ï´Êñ¤Ë Samba¡ÊWindows ¥Í¥Ã¥È¥ï¡¼¥¯¡Ë¥µ¡¼¥Ð¡¢
DHCP ¥µ¡¼¥Ð¡¢¤½¤ì¤«¤éÆâÉô¤Î¥¦¥§¥Ö¥µ¡¼¥Ð¤Ë¤Ç¤­¤Þ¤¹¡£
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<H2><A NAME="ss4.1">4.1 ¥«¡¼¥Í¥ë</A>
</H2>

<P>½ÅÍפʤâ¤Î¤«¤éÀè¤ËÏ䷤Ƥª¤¯¤È¡¢¤¢¤Ê¤¿¤Ï¥«¡¼¥Í¥ë¤ÎÃæ¤Ç ppp ¤òÍ­¸ú¤Ë¤·¤Æ
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<H2><A NAME="ss4.2">4.2 ¥ê¥ó¥¯¤ò³ÎΩ¤¹¤ë</A>
</H2>

<P>¥ê¥ó¥¯¤Ï¡¢µ¼»÷üËö¤òÄ̤·¤ÆÆ°ºî¤·¤Æ¤¤¤ë <CODE>pppd</CODE> ¤Ë¤è¤Ã¤ÆÀ¸À®¤µ¤ì¤Þ¤¹¡£
¡Ê¤½¤Îµ¼»÷üËö¤Ï¡Ë<CODE>pty-redir</CODE> ¤Ë¤è¤Ã¤ÆÀ¸À®¤µ¤ì¡¢<CODE>ssh</CODE> ¤ËÀܳ
¤µ¤ì¤Æ¤¤¤Þ¤¹¡£¤³¤ì¤Ï¼¡¤Ë¼¨¤¹¤è¤¦¤Ê¥³¥Þ¥ó¥ÉÎó¤Ë¤è¤Ã¤Æ¼Â¸½¤µ¤ì¤Þ¤¹ - 
<P>
<PRE>
# /usr/sbin/pty-redir /usr/bin/ssh -t -e none -o 'Batchmode yes' -c blowfish -i /root/.ssh/identity.vpn -l joe > /tmp/vpn-device
# sleep 10

# /usr/sbin/pppd `cat /tmp/vpn-device`
# sleep 15

# /sbin/route add -net 172.16.0.0 gw vpn-internal.mycompany.com netmask 255.240.0.0
# /sbin/route add -net 192.168.0.0 gw vpn-internal.mycompany.com netmask 255.255.0.0
</PRE>
<P>ñ¤Ë¤³¤ì¤¬¤ä¤ë¤Î¤Ï ssh ¤ò¼Â¹Ô¤·¡¢¤½¤ÎÆþ½ÐÎϤò pppd ¤Ë¥ê¥À¥¤¥ì¥¯¥È
¤¹¤ë¤È¤¤¤¦¤³¤È¤Ç¤¹¡£ssh ¤ËÅϤµ¤ì¤ë¥ª¥×¥·¥ç¥ó¤Ï¡¢¤½¤ì¤ò¥¨¥¹¥±¡¼¥×
¥­¥ã¥é¥¯¥¿¤Ê¤·¤ÇÆ°ºî¤· (-e) ¡¢ blowfish °Å¹æ²½¥¢¥ë¥´¥ê¥º¥à
¤ò»È¤¤ (-c)¡¢»ØÄꤷ¤¿Ç§¾Ú¥Õ¥¡¥¤¥ë¤ò»È¤Ã¤Æ (-i)¡¢¥¿¡¼¥ß¥Ê¥ë¥â¡¼¥É¤Ç (-t)¡¢
¤µ¤é¤Ë 'Batchmode yes' ¥ª¥×¥·¥ç¥ó¤Ä¤­¤Ç (-o) ¼Â¹Ô¤¹¤ë¤è¤¦ÀßÄꤷ¤Þ¤¹¡£
sleep ¥³¥Þ¥ó¥É¤Ï¡¢¤½¤ì¤¾¤ì¤¬¤½¤Î¼¡¤Î¥³¥Þ¥ó¥É¤Î¼Â¹ÔÁ°¤Ëµ¯Æ°¤ò´°Î»
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<H2><A NAME="ss4.3">4.3 ¥¹¥¯¥ê¥×¥È¤ò½ñ¤¯</A>
</H2>

<P>¤â¤Á¤í¤ó¡¢¤¢¤Ê¤¿¤Ï¥È¥ó¥Í¥ë¤òÄ̲ᤵ¤»¤¿¤¤¤È¤­¤Ë¡¢¤½¤ÎÅÔÅÙ¤½¤ì¤é¤Î¥³¥Þ¥ó¥É¤ò
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¤è¤¦¤Ê bash ¥¹¥¯¥ê¥×¥È¤Î¥»¥Ã¥È¤ò½ñ¤­¤Þ¤·¤¿¡£¥Ñ¥Ã¥±¡¼¥¸¤Ï 
<A HREF="http://www.shinythings.com/vpnd/vpnd.tar.gz">¤³¤³</A>¤«¤é¥À¥¦¥ó¥í¡¼¥É¤Ç¤­¤Þ¤¹¡£¥À¥¦¥ó¥í¡¼¥É¤·¤Æ /usr/local/vpn ¤Ë
¿­Ä¹¤·¤Æ¤¯¤À¤µ¤¤¡£¤½¤ÎÃæ¤Ë¤Ï 3 ¤Ä¤Î¥Õ¥¡¥¤¥ë¤¬¤¢¤ê¤Þ¤¹ - 
<P>
<UL>
<LI>vpnd - ¥È¥ó¥Í¥ëÀܳ¤òÀ©¸æ¤¹¤ë¥¹¥¯¥ê¥×¥È</LI>
<LI>check-vpnd - vpnd ¤¬µ¯Æ°¤·¤Æ¤¤¤ë¤«¤É¤¦¤«¤ò¥Á¥§¥Ã¥¯¤¹¤ë¤¿¤á¤Ë cron ¤Ë
¤è¤Ã¤Æ¼Â¹Ô¤µ¤ì¤ë¥¹¥¯¥ê¥×¥È</LI>
<LI>pty-redir - ¥È¥ó¥Í¥ë¤ò½é´ü²½¤¹¤ë¤¿¤á¤ËɬÍפʡ¢¾®¤µ¤Ê¼Â¹Ô¥Õ¥¡¥¤¥ë</LI>
</UL>
<P>¥¯¥é¥¤¥¢¥ó¥È¤Î¥æ¡¼¥¶Ì¾¤ä¥µ¡¼¥Ð¤Î̾Á°¤È¤¤¤¦¤è¤¦¤Ê¤³¤È¤òÀßÄꤹ¤ë¤¿¤á¤Ë¤Ï
<CODE>vpnd</CODE> ¤òÊÔ½¸¤¹¤ëɬÍפ¬¤¢¤ë¤Ç¤·¤ç¤¦¡£¤Þ¤¿ÍøÍѤ·¤Æ¤¤¤ë
¥Í¥Ã¥È¥ï¡¼¥¯¤ò»ØÄꤹ¤ë¤¿¤á¤Ë¡¢¥¹¥¯¥ê¥×¥È¤Î starttunnel ¥»¥¯¥·¥ç¥ó¤òÊÔ½¸
¤¹¤ëɬÍפ⤢¤ë¤Ç¤·¤ç¤¦¡£°Ê²¼¤Ï¤¢¤Ê¤¿¤Ë´î¤ó¤ÇÆɤó¤Ç¤â¤é¤¦¤¿¤á¤Î¡¢¥¹¥¯¥ê¥×¥È¤Î
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¤½¤Î¤¿¤á¤Ë¤Ï VPN_DIR ÊÑ¿ô¤òÊѹ¹¤¹¤ì¤Ð¤è¤¤¤È¤¤¤¦¤³¤È¤ò³Ð¤¨¤Æ¤ª¤¤¤Æ¤¯¤À¤µ¤¤¡£
<P>
<A NAME="vpnd-script"></A> <PRE>

#! /bin/bash
#
# vpnd: Monitor the tunnel, bring it up and down as necessary
#

USERNAME=vpn-username
IDENTITY=/root/.ssh/identity.vpn

VPN_DIR=/usr/local/vpn
LOCK_DIR=/var/run
VPN_EXTERNAL=vpn.mycompany.com
VPN_INTERNAL=vpn-internal.mycompany.com
PTY_REDIR=${VPN_DIR}/pty-redir
SSH=${VPN_DIR}/${VPN_EXTERNAL}
PPPD=/usr/sbin/pppd
ROUTE=/sbin/route
CRYPTO=blowfish
PPP_OPTIONS="noipdefault ipcp-accept-local ipcp-accept-remote local noauth nocrtscts lock nodefaultroute"
ORIG_SSH=/usr/bin/ssh


starttunnel () {
   $PTY_REDIR $SSH -t -e none -o 'Batchmode yes' -c $CRYPTO -i $IDENTITY -l $USERNAME > /tmp/vpn-device
   sleep 15

   $PPPD `cat /tmp/vpn-device` $PPP_OPTIONS
   sleep 15

   # Add routes (modify these lines as necessary)
   /sbin/route add -net 10.0.0.0 gw $VPN_INTERNAL netmask 255.0.0.0
   /sbin/route add -net 172.16.0.0 gw $VPN_INTERNAL netmask 255.240.0.0
   /sbin/route add -net 192.168.0.0 gw $VPN_INTERNAL netmask 255.255.0.0
}

stoptunnel () {
   kill `ps ax | grep $SSH | grep -v grep | awk '{print $1}'`
}

resettunnel () {
   echo "reseting tunnel."
   date >> ${VPN_DIR}/restart.log
   eval stoptunnel
   sleep 5
   eval starttunnel
}

checktunnel () {
   ping -c 4 $VPN_EXTERNAL 2>/dev/null 1>/dev/null

   if [ $? -eq 0 ]; then
      ping -c 4 $VPN_INTERNAL 2>/dev/null 1>/dev/null
      if [ $? -ne 0 ]; then
         eval resettunnel
      fi
   fi
}

settraps () {
   trap "eval stoptunnel; exit 0" INT TERM
   trap "eval resettunnel" HUP
   trap "eval checktunnel" USR1
}

runchecks () {
   if [ -f ${LOCK_DIR}/tunnel.pid ]; then
      OLD_PID=`cat ${LOCK_DIR}/vpnd.pid`
      if [ -d /proc/${OLD_PID} ]; then
         echo "vpnd is already running on process ${OLD_PID}."
         exit 1
      else
         echo "removing stale pid file."
         rm -rf ${LOCK_DIR}/vpnd.pid
         echo $$ > ${LOCK_DIR}/vpnd.pid
         echo "checking tunnel state."
         eval checktunnel
      fi
   else
      echo $$ > ${LOCK_DIR}/vpnd.pid
      eval starttunnel
   fi
}

case $1 in
    check)  if [ -d /proc/`cat ${LOCK_DIR}/vpnd.pid` ]; then
               kill -USR1 `cat ${LOCK_DIR}/vpnd.pid`
               exit 0
            else
               echo "vpnd is not running."
               exit 1
            fi ;;

    reset)  if [ -d /proc/`cat ${LOCK_DIR}/vpnd.pid` ]; then
               kill -HUP `cat ${LOCK_DIR}/vpnd.pid`
               exit 0
            else
               echo "vpnd is not running."
               exit 1
            fi ;;

   --help | -h)
            echo "Usage: vpnd [ check | reset ]"
            echo "Options:"
            echo "     check    Sends running vpnd a USR1 signal, telling it to check"
            echo "              the tunnel state, and restart if neccesary."
            echo "     reset    Sends running vpnd a HUP signal, telling it to reset"
            echo "              it's tunnel connection." ;; 
esac

ln -sf $ORIG_SSH $SSH
settraps
runchecks

while true; do
   i=0
   while [ $i -lt 600 ]; do
      i=((i+1))
      sleep 1
   done
   eval checktunnel
done
</PRE>
<H2><A NAME="ss4.4">4.4 LRP - Linux ¥ë¡¼¥¿¥×¥í¥¸¥§¥¯¥È</A>
</H2>

<P>¼ÂºÝ¡¢»ä¤Ï¤³¤Î´Ä¶­¤ò Linux ¤Î LRP ¥Ç¥£¥¹¥È¥ê¥Ó¥å¡¼¥·¥ç¥ó¤¬Áö¤ë pentium
90MHz ¤Î¾å¤ÇÆ°ºî¤µ¤»¤Æ¤¤¤Þ¤¹¡£LRP¤Ï 1 Ëç¤Î¥Õ¥í¥Ã¥Ô¡¼¥Ç¥£¥¹¥¯¤Ë¼ý¤Þ¤ê¡¢
µ¯Æ°¤¹¤ë Linux ¥Ç¥£¥¹¥È¥ê¥Ó¥å¡¼¥·¥ç¥ó¤Ç¤¹¡£¤³¤ì°Ê¾å¤Î¤³¤È¤Ë¤Ä¤¤¤Æ¤Ï 
<A HREF="http://www.linuxrouter.org/">http://www.linuxrouter.org/</A>
¤Ç³Ø¤Ö¤³¤È¤¬¤Ç¤­¤Þ¤¹¡£
»ä¤Î VPN ¥¯¥é¥¤¥¢¥ó¥ÈÍѤΠLRP ¥Ñ¥Ã¥±¡¼¥¸¤Ï¡¢
<A HREF="http://www.shinythings.com/vpnd/vpnd.lrp">¤³¤³</A>¤«¤é
¥À¥¦¥ó¥í¡¼¥É¤Ç¤­¤Þ¤¹¡£¤½¤ì¤«¤é ppp ¤ª¤è¤Ó ssh ¥Ñ¥Ã¥±¡¼¥¸¤â LRP ¥µ¥¤¥È
¤«¤éÆÀ¤ëɬÍפ¬¤¢¤ë¤Ç¤·¤ç¤¦¡£
<HR>
<A HREF="VPN-HOWTO-5.html">¼¡¤Î¥Ú¡¼¥¸</A>
<A HREF="VPN-HOWTO-3.html">Á°¤Î¥Ú¡¼¥¸</A>
<A HREF="VPN-HOWTO.html#toc4">Ìܼ¡¤Ø</A>
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