net-dns/djbdns/files/dnscache-setup

   1 #!/bin/bash
   2
   3 #for einfo, ewarn etc..
   4 . /etc/init.d/functions.sh
   5
   6 setup() {
   7         echo
   8         echo
   9         einfo "Dnscache Setup"
  10         echo
  11         echo
  12         echo ">>> More information on this package can be found at"
  13         echo ">>> http://cr.yp.to/djbdns.html and http://djbdns.org"
  14         echo
  15         echo "After this script completes, dnscache will be configured."
  16         echo "Your /etc/resolv.conf will be updated so that all DNS"
  17         echo "lookups will be directed to dnscache."
  18         echo
  19         echo "Your original /etc/resolv.conf will be backed up to "
  20         echo "/etc/resolv.conf.orig."
  21         echo
  22         echo "If you have previously setup dnscache, those directories will"
  23         echo "not be overwritten.  To redo setup, delete your dnscache"
  24         echo "dirs first or choose a different install location."
  25         echo
  26         echo '(press enter to begin setup, or press control-C to abort)'
  27         echo
  28         read
  29
  30         echo
  31         einfo "Install location"
  32         echo
  33         echo "Where do you want dnscache installed?"
  34         echo "Ex. Default (/var) will install dnscache in /var/dnscache,"
  35         echo "or an external cache in /var/dnscachex."
  36         echo "!!No trailing slash!!"
  37         echo
  38         read -p "[/var]> " mypath
  39         echo
  40
  41         if [ "$mypath" == "" ]
  42         then
  43                 mypath="/var"
  44         fi
  45
  46         if [ ! -e ${mypath} ]
  47         then
  48                 echo ">>> Creating ${mypath}..."
  49                 mkdir $mypath
  50         fi
  51
  52         echo
  53         echo
  54         einfo "Internal or external cache?"
  55         echo
  56         echo "Specify an address to which dnscache should bind."
  57         echo "If this is the only machine accessing dnscache,"
  58         echo "127.0.0.1 is a good start."
  59         echo "Currently running IP addresses:"
  60         echo
  61
  62         # grab interfaces
  63         addrs=`ifconfig -a | grep "inet addr" | cut -f2 -d":" | cut -f1 -d" "`
  64
  65         echo $addrs
  66         echo
  67         read -p "IP to bind cache to [127.0.0.1]> " myip
  68         echo
  69
  70         if [ "$myip" == "" ]
  71         then
  72                 myip="127.0.0.1"
  73                 mycachedir="dnscache"
  74         else
  75                 mycachedir="dnscachex"
  76         fi
  77
  78         # check for existance of users dnscache and dnslog:
  79         echo
  80         echo
  81         einfo "Checking for dnscache and dnslog user accts ..."
  82         echo
  83         /usr/bin/grep nofiles /etc/group &> /dev/null
  84         if [ $? -ne 0 ]
  85         then
  86                 echo ">>> Adding group nofiles ..."
  87                 /usr/sbin/groupadd nofiles &> /dev/null
  88         fi
  89
  90         /usr/bin/grep dnscache /etc/passwd &> /dev/null
  91         if [ $? -ne 0 ]
  92         then
  93                 echo ">>> Adding user dnscache ..."
  94                 /usr/sbin/useradd -d /dev/null -s /bin/false -g nofiles \
  95                         dnscache &> /dev/null
  96         fi
  97
  98         /usr/bin/grep dnslog /etc/passwd &> /dev/null
  99         if [ $? -ne 0 ]
 100         then
 101                 echo ">>> Adding user dnslog ..."
 102                 /usr/sbin/useradd -d /dev/null -s /bin/false -g nofiles \
 103                         dnslog &> /dev/null
 104         fi
 105
 106         if [ ! -e ${mypath}/${mycachedir} ]
 107         then
 108                 /usr/bin/dnscache-conf dnscache dnslog \
 109                         ${mypath}/${mycachedir} ${myip}
 110         else
 111                 ewarn "*** dnscache directory currently exists, nothing done."
 112         fi
 113
 114         echo
 115         echo
 116         einfo "Configure a forward for dnscache?"
 117         echo
 118         echo "dnscache can be configured to forward queries to another"
 119         echo "nameserver (such as the nameserver of your ISP) rather than "
 120         echo "perform the lookups itself.  If you would like to enable this "
 121         echo "forwarding mode (a good idea most of the time), then enter the "
 122         echo "IP's of your forwarding nameservers now,"
 123         echo "otherwise just hit Enter."
 124         echo
 125         read -p "enter forward-to IP> " myforward
 126         echo
 127         if [ "$myforward" != "" ]
 128         then
 129                 echo $myforward > ${mypath}/${mycachedir}/root/servers/\@
 130                 echo -n "1" > ${mypath}/${mycachedir}/env/FORWARDONLY
 131
 132                 read -p "enter forward-to IP [hit Enter to stop]> " myforward
 133                 while [ "$myforward" != "" ]
 134                 do
 135                         echo $myforward >> ${mypath}/${mycachedir}/root/servers/\@
 136                         read -p "enter forward-to IP [hit Enter to stop]> " myforward
 137                 done
 138                 echo ">>> Setting up forwarding..."
 139         fi
 140
 141         if [ "$myip" != "127.0.0.1" ]
 142         then
 143                 echo
 144                 echo
 145                 einfo "Configuring clients"
 146                 echo
 147                 echo "dnscache by default only allows 127.0.0.1 to access it."
 148                 echo "You have to specify the IP addresses of the clients"
 149                 echo "that shall be allowed to use dnscache."
 150                 echo
 151                 echo "1.2.3.4 would allow host 1.2.3.4"
 152                 echo "1.2.3 would allow all hosts underneath 1.2.3.x"
 153                 echo
 154                 echo "Just hit Enter if you do not want to specify clients!"
 155                 echo
 156
 157                 read -p "Enter IP> " myclientip
 158
 159                 while [ "$myclientip" != "" ]
 160                 do
 161                         touch ${mypath}/${mycachedir}/root/ip/${myclientip}
 162                         read -p "Enter IP (hit Enter to stop)>" myclientip
 163                 done
 164         fi
 165
 166         echo
 167         echo
 168         einfo "Misc"
 169         echo
 170         if [ ! -e /var/log/dnscache ]
 171         then
 172                 echo ">>> linking /var/log/${mycachedir} to the $mycachedir log..."
 173                 ln -s ${mypath}/${mycachedir}/log/main /var/log/${mycachedir}
 174         fi
 175
 176         if [ -e /etc/resolv.conf ]
 177         then
 178                 /usr/bin/grep $myip /etc/resolv.conf &> /dev/null
 179                 if [ $? -ne 0 ]
 180                 then
 181                         echo ">>> Backing up /etc/resolv.conf to resolv.conf.orig..."
 182                         cp /etc/resolv.conf /etc/resolv.conf.orig
 183                         cat /etc/resolv.conf.orig | grep -v nameserver > /etc/resolv.conf
 184                         echo ">>> Removed nameserver entries from resolv.conf..."
 185                         echo nameserver $myip >> /etc/resolv.conf
 186                         echo
 187                         echo ">>> Added \"nameserver ${myip}\" to /etc/resolv.conf!"
 188                 else
 189                         echo ">>> ${myip} is already in /etc/resolv.conf - nothing done!"
 190                 fi
 191         else
 192                 echo nameserver $myip >> /etc/resolv.conf
 193                 echo
 194                 echo ">>> Added \"nameserver ${myip}\" to /etc/resolv.conf!"
 195         fi
 196
 197         #TODO
 198         #configure cachsize - $mypath/env/CACHESIZE
 199
 200         #TODO
 201         #configure datalimit - $mypath/env/DATALIMIT
 202
 203         echo
 204         echo
 205         einfo "Start service"
 206         echo
 207         echo "dnscache is ready for startup."
 208         echo "Do you want dnscache to be started and"
 209         echo "supervised by daemontools now?"
 210
 211         echo
 212         echo "This requires svscan (daemontools) to be running currently and"
 213         echo "monitoring /service !!"
 214         echo
 215         echo '(press control-C to abort)'
 216         read
 217
 218         # check in /mnt/.init.d to find svscan link in running...
 219         # if not running execute /etc/init.d/svscan start
 220         # Don't make symbolic links to / !
 221         # use ../ instead as it gives trouble in chrooted environments
 222         # By Kalin KOZHUHAROV <kalin@ThinRope.net>
 223         local fixedroot_path=`echo ${mypath} | sed -e 's#^/#../#'`
 224         cd /service
 225         ln -sf ${fixedroot_path}/${mycachedir} .
 226
 227         echo
 228         echo
 229         einfo "Installation successfull"
 230         echo
 231 }
 232
 233 # check for root user
 234
 235 if [ `id -u` -ne 0 ]
 236 then
 237         eerror "${0}: must be root."
 238         exit 1
 239 fi
 240
 241
 242 # run setup
 243 setup