From fc34d033231d123efa51cfa939ef9043a495e8df Mon Sep 17 00:00:00 2001
From: Eric Hameleers <alien@slackware.com>
Date: Thu, 5 May 2016 16:15:23 +0200
Subject: Add PXE server infrastructure.

See the README.txt for instructions on how to use the 'pxeserver' script
and what it can do for you.
---
 make_slackware_live.sh |  19 ++
 pxeserver              | 712 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 731 insertions(+)
 create mode 100755 pxeserver

diff --git a/make_slackware_live.sh b/make_slackware_live.sh
index 381f116..1713ad2 100755
--- a/make_slackware_live.sh
+++ b/make_slackware_live.sh
@@ -1133,6 +1133,25 @@ fi
 mkdir -p  ${LIVE_ROOTDIR}/usr/local/sbin
 install -m0755 ${LIVE_TOOLDIR}/makemod ${LIVE_TOOLDIR}/iso2usb.sh  ${LIVE_ROOTDIR}/usr/local/sbin/
 
+# Add PXE Server infrastructure:
+mkdir -p ${LIVE_ROOTDIR}/var/lib/tftpboot/pxelinux.cfg
+cp -ia /usr/share/syslinux/pxelinux.0 ${LIVE_ROOTDIR}/var/lib/tftpboot/
+ln -s /mnt/livemedia/boot/generic ${LIVE_ROOTDIR}/var/lib/tftpboot/
+ln -s /mnt/livemedia/boot/initrd.img ${LIVE_ROOTDIR}/var/lib/tftpboot/
+cat ${LIVE_TOOLDIR}/pxeserver | sed \
+  -e "s/@DIRSUFFIX@/$DIRSUFFIX/g" \
+  -e "s/@DISTRO@/$DISTRO/g" \
+  -e "s/@CDISTRO@/${DISTRO^}/g" \
+  -e "s/@UDISTRO@/${DISTRO^^}/g" \
+  -e "s/@KVER@/$KVER/g" \
+  -e "s/@LIVEDE@/$LIVEDE/g" \
+  -e "s/@LIVEMAIN@/$LIVEMAIN/g" \
+  -e "s/@MARKER@/$MARKER/g" \
+  -e "s/@SL_VERSION@/$SL_VERSION/g" \
+  -e "s/@VERSION@/$VERSION/g" \
+  > ${LIVE_ROOTDIR}/usr/local/sbin/pxeserver
+chmod 755 ${LIVE_ROOTDIR}/usr/local/sbin/pxeserver
+
 # Only when we find a huge kernel, we will add a harddisk installer
 # to the ISO.  The huge kernel does not require an initrd and installation
 # to the hard drive will not be complicated.
diff --git a/pxeserver b/pxeserver
new file mode 100755
index 0000000..3ec9370
--- /dev/null
+++ b/pxeserver
@@ -0,0 +1,712 @@
+#!/bin/sh
+#
+# Copyright 2011, 2016  Eric Hameleers, Eindhoven, NL
+# Copyright 2011  Patrick Volkerding, Sebeka, Minnesota USA
+# All rights reserved.
+#
+# Redistribution and use of this script, with or without modification, is 
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of this script must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
+#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
+#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
+#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
+#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Code used from SeTpxe and SeTnet scripts, part of the Slackware installer.
+# ---------------------------------------------------------------------------
+
+# PXEserver works as follows:
+# - It requires a wired network; wireless PXE boot is impossible.
+# - The pxeserver script tries to find a wired interface; you can pass an
+#   explicit interfacename as parameter to the script (optional).
+# - If multiple wired interfaces are detected, a dialog asks the user to
+#   select the right one.
+# - A check is done for DHCP configuration of this wired interface;
+#   * If DHCP configuration is found then pxeserver will not start its own
+#     DHCP server and instead will rely on your LAN's DHCP server.
+#   * If no DHCP config is found, the script will ask permission to start
+#     its own internal DHCP server.
+#     Additionally the user will be prompted to configure an IP address for the
+#     network interface and IP range properties for the internal DHCP server.
+# - The script will then start the PXE server, comprising of:
+#   * dnsmasq providing DNS, DHCP and BOOTP;
+#   * NFS and RPC daemons;
+# - The script will detect if you have an outside network connection on
+#   another interface and will enable IP forwarding if needed, so that the
+#   PXE clients will also have network access.
+# - The Live OS booted via pxelinux is configured with additional boot
+#   parameters:
+#   * nfsroot=${LOCAL_IPADDR}:/mnt/livemedia
+#   * luksvol=
+#   * nop
+#   * hostname=@DISTRO@
+#   * tz=$(cat /etc/timezone)
+#   * locale=${SYSLANG:-"en_US.UTF-8"}
+#   * kbd=${KBD:-"us"}
+#   Which shows that the configuration of the Live OS where the PXE server
+#   runs is largely determining the configuration of the PXE clients.
+# - Note that when networkbooting, the hostname of the Live OS will be
+#   suffixed with the machine's MAC address to make every network-booted
+#   Live OS unique.
+
+#
+# Initialization:
+#
+
+DEBUG=${DEBUG:-0}
+DIALOG=dialog
+
+# Number of PXE clients we want to serve with our own DHCP server:
+DEF_DHCP_RANGE=${DEF_DHCP_RANGE:-10}
+
+# Optional argument to the script is the name of the interface on which
+# the PXE server should run:
+INTERFACE="$1"
+
+# This variable will be used to determine if the network default gateway
+# is reached through a second NIC in the computer, or not.
+GLOBAL_GW_INT=""
+
+# In the above case, the global and local gateways will not be equal.
+GLOBAL_GATEWAY=""
+LOCAL_GATEWAY=""
+
+# The Slackware setup depends on english language settings because it
+# parses program output like that of "fdisk -l". So, we need to override
+# the Live user's local language settings here:
+SYSLANG=$LANG
+export LANG=C
+export LC_ALL=C
+
+# Warn the user if the Live Media is inaccessible (however unlikely):
+if [ ! -d /mnt/livemedia/@LIVEMAIN@/system ]; then
+  if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+  $DIALOG --title "LIVE MEDIA NOT ACCESSIBLE" --msgbox "\
+\n\
+Before you can install software, complete the following tasks:\n\
+\n\
+1. Mount your Live media partition on /mnt/livemedia." 16 68
+  exit 1
+fi
+
+TMP=/var/log/setup/tmp
+if [ ! -d $TMP ]; then
+  mkdir -p $TMP
+fi
+rm -f $TMP/SeT*
+echo "on" > $TMP/SeTcolor # turn on color menus
+PATH="$PATH:/usr/share/@LIVEMAIN@"
+export PATH;
+export COLOR=on
+
+# Add some eye candy for PXE clients:
+if [ -d /mnt/livemedia/boot/syslinux ]; then
+  PXETXTSRC=/mnt/livemedia/boot/syslinux
+elif [ -d /mnt/livemedia/boot/extlinux ]; then
+  PXETXTSRC=/mnt/livemedia/boot/extlinux
+else
+  PXETXTSRC=""
+fi
+if [ -n "$PXETXTSRC" ]; then
+  ln -s ${PXETXTSRC}/message.txt /var/lib/tftpboot/
+  ln -s ${PXETXTSRC}/f2.txt /var/lib/tftpboot/
+  ln -s ${PXETXTSRC}/f3.txt /var/lib/tftpboot/
+  ln -s ${PXETXTSRC}/f4.txt /var/lib/tftpboot/
+fi
+
+#
+# Function definitions:
+#
+
+# Function to convert the netmask from CIDR format to dot notation.
+cidr_cvt() {
+  # Number of args to shift, 255..255, first non-255 byte, zeroes
+  set -- $(( 5 - ($1 / 8) )) 255 255 255 255 $(( (255 << (8 - ($1 % 8))) & 255 )) 0 0 0
+  [ $1 -gt 1 ] && shift $1 || shift
+  echo ${1-0}.${2-0}.${3-0}.${4-0}
+}
+
+# Function to convert the netmask from dot notation to CIDR format.
+mask_cvt ()
+{
+  # Assumes there's no "255." after a non-255 byte in the mask
+  local x=${1##*255.}
+  set -- 0^^^128^192^224^240^248^252^254^ $(( (${#1} - ${#x})*2 )) ${x%%.*}
+  x=${1%%$3*}
+  echo $(( $2 + (${#x}/4) ))
+}
+
+# IP Address to integer conversion:
+ip_to_int() {
+  IFS=.
+  set -f
+  set -- $1
+  echo $(($1 << 24 | $2 << 16 | $3 << 8 | $4))
+}
+
+# Integer to IP Address conversion:
+int_to_ip() {
+  echo $(($1>>24)).$(($1>>16&0xff)).$(($1>>8&0xff)).$(($1&0xff))
+}
+
+# The network interface IP configuration routine.
+# Will be called if the interface was not configured by DHCP.
+# It ends with a configured network interface:
+devconfig() {
+  # Function accepts a parameter; if not given, use the global INTERFACE:
+  MYIF=${1:-"$INTERFACE"}
+
+  # Determine a LAN range we are going to be using for the internal DHCP
+  # range that does not conflict with existing IP configuration:
+  if ! ip -f inet -o addr show |grep -v " lo " |grep -qw 192.168 ; then
+    MYIP="192.168.10.10"
+  elif ! ip -f inet -o addr show |grep -v " lo " |grep -qw 172.16 ; then
+    MYIP="172.16.10.10"
+  else
+    MYIP="10.10.10.10"
+  fi
+
+  # Main loop IP configuration:
+  while [ 0 ]; do
+
+    cat << EOF > $TMP/tempmsg
+
+You will need to enter the IP address you wish to
+assign to interface ${MYIF}. Example: ${MYIP}
+
+What is your IP address?
+EOF
+    if [ "x$LOCAL_IPADDR" = "x" ]; then # assign default
+      LOCAL_IPADDR=${MYIP}
+    fi
+    if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+    $DIALOG --title "ASSIGN IP ADDRESS" --inputbox "$(cat $TMP/tempmsg)" 12 \
+      65 $LOCAL_IPADDR 2> $TMP/local
+    if [ ! $? = 0 ]; then
+      rm -f $TMP/tempmsg $TMP/local
+      return
+    fi
+    LOCAL_IPADDR="$(cat $TMP/local)"
+    rm -f $TMP/local
+    clear
+    cat << EOF > $TMP/tempmsg
+
+Now we need to know your netmask.
+Typically this will be 255.255.255.0
+but this can be different depending on
+your local setup.
+
+What is your netmask?
+EOF
+    if [ "x$LOCAL_NETMASK" = "x" ]; then # assign default
+      LOCAL_NETMASK=${NETMASK:-255.255.255.0}
+    fi
+    if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+    $DIALOG --title "ASSIGN NETMASK" --inputbox "$(cat $TMP/tempmsg)" 14 \
+      65 $LOCAL_NETMASK 2> $TMP/mask
+    if [ ! $? = 0 ]; then
+      rm -f $TMP/tempmsg $TMP/mask
+      return
+    fi
+    clear
+    LOCAL_NETMASK="$(cat $TMP/mask)"
+    rm $TMP/mask
+
+    # GLOBAL_GATEWAY was determined right before calling this function:
+    if [ "x$GLOBAL_GATEWAY" = "x" ]; then
+      if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+      $DIALOG --yesno "Do you have a gateway?" 5 30
+      HAVE_GATEWAY=$?
+      clear
+      if [ $HAVE_GATEWAY -eq 0 ]; then
+        LOCAL_GATEWAY="$(echo $LOCAL_IPADDR | cut -f1-3 -d '.')."
+        if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+        $DIALOG --title "ASSIGN GATEWAY ADDRESS" --inputbox \
+          "\nWhat is the IP address for your gateway?" 9 65 \
+          $LOCAL_GATEWAY 2> $TMP/gw
+        if [ ! $? = 0 ]; then
+          rm -f $TMP/tempmsg $TMP/gw
+          LOCAL_GATEWAY=""
+        else
+          LOCAL_GATEWAY="$(cat $TMP/gw)"
+          rm -f $TMP/gw
+        fi
+      fi
+      unset HAVE_GATEWAY
+      clear
+    elif [ "$GLOBAL_GW_INT" = "$MYIF" ]; then
+      LOCAL_GATEWAY=$GLOBAL_GATEWAY
+    fi
+
+    cat << EOF > $TMP/tempmsg
+
+This is the proposed network configuration for $MYIF -
+If this is OK, then select 'Yes'.
+If this is not OK and you want to configure again, select 'No'.
+
+* IP Address: $LOCAL_IPADDR 
+* Netmask:    $LOCAL_NETMASK
+* Gateway:    ${LOCAL_GATEWAY:-"$GLOBAL_GATEWAY (via $GLOBAL_GW_INT)"}
+EOF
+    if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+    $DIALOG --no-collapse --title "NETWORK CONFIGURATION" \
+      --yesno "$(cat $TMP/tempmsg)" 14 68
+    if [ $? -eq 1 ]; then
+      continue # New round of questions
+    fi
+
+    #echo "Configuring ethernet card..."
+    if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+    $DIALOG --title "INITIALIZING NETWORK" --infobox \
+      "\nConfiguring your network interface $MYIF ..." 5 56
+
+    # We don't need this anymore:
+    dhcpcd -k $MYIF 1>/dev/null 2>&1
+    rm -f /run/dhcpcd/dhcpcd-${MYIF}.pid
+
+    # Broadcast and network are derived from IP and netmask:
+    LOCAL_BROADCAST=$(ipmask $LOCAL_NETMASK $LOCAL_IPADDR | cut -f 1 -d ' ')
+    LOCAL_NETWORK=$(ipmask $LOCAL_NETMASK $LOCAL_IPADDR | cut -f 2 -d ' ')
+    if [ -x /etc/rc.d/rc.networkmanager 2>/dev/null ]; then
+      # Use nmcli to reconfigure NetworkManager:
+      nmcli con add con-name pxe-${MYIF} ifname ${MYIF} type ethernet ip4 $LOCAL_IPADDR/$(mask_cvt $LOCAL_NETMASK)
+      if [ "x$GLOBAL_GATEWAY" = "x" -a "x$LOCAL_GATEWAY" != "x" ]; then
+        nmcli con mod pxe-${MYIF} ipv4.gateway $LOCAL_GATEWAY
+      fi
+      nmcli dev connect ${MYIF}
+    else
+      # Use ifconfig and route commands:
+      ifconfig $MYIF $LOCAL_IPADDR netmask $LOCAL_NETMASK broadcast $LOCAL_BROADCAST
+      if [ "x$GLOBAL_GATEWAY" = "x" -a "x$LOCAL_GATEWAY" != "x" ]; then
+        #echo "Configuring your gateway..."
+        route add default gw $LOCAL_GATEWAY metric 1
+      fi
+    fi
+    echo $LOCAL_IPADDR > $TMP/SeTIP
+    echo $LOCAL_NETMASK > $TMP/SeTnetmask
+    echo $LOCAL_GATEWAY > $TMP/SeTgateway
+    clear
+    break
+
+  done # end main loop IP configuration
+
+} # end devconfig()
+
+# The PXE Server configuration routine:
+pxeconfig() {
+
+  # This function accepts a parameter (network interface to configure).
+  # If no name was passed, we will do our best to find out ourselves.
+
+  # Create empty PXE configuration file:
+  echo "" > $TMP/SeTpxe
+
+  # Find out what interface we should be using.
+  # Did we get one passed as a parameter?
+  if [ "x$1" = "x" ]; then
+    # No parameter or it was empty; find out if we have a wired interface:
+    WIRED_INT=""
+    IINT=0
+    for WINT in $(ls --indicator-style=none /sys/class/net |grep -v ^lo); do
+      if ! grep -q $WINT /proc/net/wireless ; then
+        WIRED_INT="$WIRED_INT $WINT"
+        IINT=$(( $IINT + 1 ))
+      fi
+    done
+    if [ $IINT -eq 0 ]; then
+      # Zero wired interfaces found - exit.
+      cat <<EOF > $TMP/tempmsg
+
+Could not find a wired network interface. \n\
+A PXE Server needs a configured network interface to work.\n\
+
+EOF
+    if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+    $DIALOG --title "MISSING NETWORK DEVICE" --msgbox "$(cat $TMP/tempmsg)"
+8 68
+      rm -f $TMP/tempmsg
+      exit 1
+    elif [ $IINT -eq 1 ]; then
+      # Exactly one wired interfaces found - use it.
+      INTERFACE=$(echo $WIRED_INT) # get rid of the space
+    else
+      # Multiple wired interfaces found - let the user select one:
+      rm -f $TMP/iflist
+      for WINT in $WIRED_INT ; do
+        DRIVERTXT="IP=$(ip -f inet -o addr show ${WINT} |tr -s ' ' |head -1 |cut - f4 -d' ' |cut -f1 -d/)"
+        if cat /sys/class/net/$WINT/device/uevent 1>/dev/null 2>/dev/null ; then
+          DRIVERTXT="$DRIVERTXT driver=$(grep "DRIVER=" /sys/class/net/$WINT/device/uevent |cut -f2 -d=)"
+        fi
+        echo "$WINT \"network interface ($DRIVERTXT)\"" >> $TMP/iflist
+      done
+      if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+      $DIALOG --title "SELECT NETWORK INTERFACE" \
+        --menu \
+"Select an option below using the UP/DOWN keys and SPACE or ENTER.\n\
+Alternate keys may also be used: '+', '-', and TAB." 13 72 9 \
+        --file $TMP/iflist \
+        2> $TMP/intset
+      INTERFACE="$(cat $TMP/intset)"
+      rm $TMP/intset $TMP/iflist
+    fi
+  fi # End undefined INTERFACE
+
+  #
+  # We now know what network interface to use.
+  #
+
+  # If dhcpcd is running, it likely has a lease from a LAN DHCP server,
+  # so we should not activate another DHCP server ourselves now:
+  if [ -s /run/dhcpcd/dhcpcd-${INTERFACE}.pid -a -n "$(ps -q $(cat /run/dhcpcd/dhcpcd-${INTERFACE}.pid) -o comm=)" ]; then
+    OWNDHCP="no"
+  else
+    # Assume nothing... we will ask the user for confirmation later!
+    OWNDHCP="yes"
+  fi
+
+  # If $INTERFACE != $GLOBAL_GW_INT then we are dealing with a dual-nic setup
+  # and later on we can suggest configuring (NAT) routing:
+  GLOBAL_GW_INT=$(ip -f inet -o route show default |grep -v linkdown |head -1 |tr -s ' ' |cut -f5 -d' ')
+  GLOBAL_GATEWAY=$(ip -f inet -o route show default |grep -v linkdown |head -1 |tr -s ' ' |cut -f3 -d' ')
+
+  #
+  # Start the interactive part:
+  #
+
+  if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+  $DIALOG --backtitle "@CDISTRO@ Linux Live PXE Server." \
+   --title "WELCOME TO PXE CONFIGURATION" --msgbox "\
+We will be asking you a few questions now.\n\
+The answers will be used to start a PXE service on this computer \
+which does not interfere with other services in your network.\
+\n\
+The only assumption is, that there is NO PXE service already \
+running on your local network at this moment.
+\n\
+If in doubt, stick with the defaults." 0 0
+
+  if [ "$OWNDHCP" = "yes" ]; then
+    # Be extra safe. Do not start a DHCP server if the user denies it:
+    if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+    $DIALOG --title "ENABLE DHCP SERVER" --yesno " \
+Network interface ${INTERFACE} did not get an IP address from a DHCP server. \
+Slackware's PXE server starting on ${INTERFACE} needs a working DHCP server.\n\
+Do you want this computer to start its own DHCP server on ${INTERFACE} \
+(you can control what IP addresses are used by the DHCP server)?\n\
+Say 'YES' if you are certain your network interface ${INTERFACE} is
+not in reach of any DHCP server." 9 68
+    if [ $? = 0 ]; then
+      OWNDHCP="yes" 
+    else
+      OWNDHCP="no" 
+    fi
+  fi
+
+  # Assemble the network parameters:
+  LOCAL_IPADDR=$(ip -f inet -o addr show ${INTERFACE} |tr -s ' ' |head -1 |cut -f4 -d' ' |cut -f1 -d/)
+  if [ "x$LOCAL_IPADDR" = "x" ]; then # no IP Address was configured?!?
+    cat <<EOF > $TMP/tempmsg
+
+Next step is to define an IP address for network interface ${INTERFACE}. \n\
+A PXE Server needs a configured network interface to work.\n\
+
+EOF
+    if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+    $DIALOG --title "UNCONFIGURED NETWORK DEVICE" --msgbox "$(cat $TMP/tempmsg)" 9 68
+    rm -f $TMP/tempmsg
+    # Run the static IP configuration routine for $INTERFACE:
+    devconfig ${INTERFACE}
+  else
+    # DHCP configured interface, we assume that the default gaeway is here.
+    LOCAL_GATEWAY=$GLOBAL_GATEWAY
+  fi
+
+  # OK we have an IP Address, let's continue.
+  LOCAL_NETMASK=$(ip -f inet -o addr show ${INTERFACE} |tr -s ' ' |head -1 |cut -f4 -d' ' |cut -f2 -d/)
+  LOCAL_NETMASK=$(cidr_cvt $LOCAL_NETMASK)
+  LOCAL_BROADCAST=$(ipmask $LOCAL_NETMASK $LOCAL_IPADDR |cut -f 1 -d ' ')
+  LOCAL_NETWORK=$(ipmask $LOCAL_NETMASK $LOCAL_IPADDR |cut -f 2 -d ' ')
+
+  if [ "$OWNDHCP" = "yes" ]; then
+    # Find out a suitable IP address range for the DHCP server. Involves magic:
+    I_LOCAL_IPADDR=$(ip_to_int "$LOCAL_IPADDR")
+    I_LOCAL_NETMASK=$(ip_to_int "$LOCAL_NETMASK")
+    I_MINLEASE_IP=$(( ($I_LOCAL_IPADDR & $I_LOCAL_NETMASK) + 1 ))
+    I_MAXLEASE_IP=$(( ($I_LOCAL_IPADDR | ${I_LOCAL_NETMASK}^0xffffffff) - 1 ))
+    if [ $(( $I_MAXLEASE_IP - $I_LOCAL_IPADDR )) -ge $DEF_DHCP_RANGE ]; then
+      # Use $DEF_DHCP_RANGE IP addresses in the top of the address range:
+      I_MINLEASE_IP=$(( $I_MAXLEASE_IP - $(($DEF_DHCP_RANGE - 1)) ))
+    elif [ $(($I_LOCAL_IPADDR - $I_MINLEASE_IP)) -ge $DEF_DHCP_RANGE ]; then
+      # Use $DEF_DHCP_RANGE IP addresses in the bottom of the address range:
+      I_MAXLEASE_IP=$(( $I_MINLEASE_IP + $(($DEF_DHCP_RANGE - 1)) ))
+    else
+      # Smaller range available than we wanted, use what we can get:
+      I_MINLEASE_IP=$(( $I_LOCAL_IPADDR + 1 ))
+    fi
+
+    MINLEASE_IP=$(int_to_ip "$I_MINLEASE_IP")
+    MAXLEASE_IP=$(int_to_ip "$I_MAXLEASE_IP")
+
+    while [ 0 ]; do
+      if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+      ( $DIALOG --stdout --backtitle "@CDISTRO@ Linux Live PXE Server." \
+          --title "DHCP SERVER CONFIGURATION" \
+          --cancel-label Restart \
+          --form "\
+The PXE Service is going to run on $INTERFACE with these values \
+(the defaults should be OK). \n\
+You can change the range of IP addresses used by the DHCP server, if \
+IP addresses in the proposed range are used by computers in your LAN. \
+For instance, your default gateway if you have one. \n\
+\n\
+Also note that we will not validate any changes you make:" \
+    18 68 0 \
+    "IP Address:"                  1 1 "$LOCAL_IPADDR"   1 30   0 0 \
+    "Netmask:"                     2 1 "$LOCAL_NETMASK"  2 30   0 0 \
+    "Gateway:"                     3 1 "$LOCAL_GATEWAY"  3 30   0 0 \
+    "Lowest DHCP Client Address:"  4 1 "$MINLEASE_IP"    4 30  15 0 \
+    "Highest DHCP Client Address:" 5 1 "$MAXLEASE_IP"    5 30  15 0 \
+      ) > $TMP/tempopts
+
+      if [ $? = 0 ]; then
+        # Remember... busybox ash is no good with arrays :/
+        local i=0
+        rm -f $TMP/tempkeys
+        cat $TMP/tempopts | while read VALUE ; do
+          if   [ $i = 0 ]; then echo "MINLEASE_IP=\"$VALUE\"" >> $TMP/tempkeys
+          elif [ $i = 1 ]; then echo "MAXLEASE_IP=\"$VALUE\"" >> $TMP/tempkeys
+          fi
+          i=$(expr $i + 1)
+        done
+        eval $(cat $TMP/tempkeys)
+        rm $TMP/tempopts
+        break
+      fi
+    done
+  else
+    if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+    $DIALOG --backtitle "@CDISTRO@ Linux Live PXE Server." \
+      --title "DHCP SERVER CONFIGURATION" --msgbox "\
+\n\
+PXE server has been configured to use a DHCP server in your network.\n\
+\n\
+Press ENTER to continue." 14 68
+  fi # [ "$OWNDHCP" = "yes" ]
+
+  echo "DHCP=${OWNDHCP}" >> $TMP/SeTpxe
+  echo "GLOBAL_GATEWAY=${GLOBAL_GATEWAY}" >> $TMP/SeTpxe
+  echo "GLOBAL_GW_INT=${GLOBAL_GW_INT}" >> $TMP/SeTpxe
+  echo "LOCAL_IPADDR=${LOCAL_IPADDR}" >> $TMP/SeTpxe
+  echo "LOCAL_NETMASK=${LOCAL_NETMASK}" >> $TMP/SeTpxe
+  echo "LOCAL_GATEWAY=${LOCAL_GATEWAY}" >> $TMP/SeTpxe
+  echo "LOCAL_BROADCAST=${LOCAL_BROADCAST}" >> $TMP/SeTpxe
+  echo "LOCAL_NETWORK=${LOCAL_NETWORK}" >> $TMP/SeTpxe
+  echo "MINLEASE_IP=${MINLEASE_IP}" >> $TMP/SeTpxe
+  echo "MAXLEASE_IP=${MAXLEASE_IP}" >> $TMP/SeTpxe
+
+  # Write out a suitable dnsmasq configuration:
+  cat <<EOF > ${TMP}/pxe_dnsmasq.conf
+# Only listen at our designated interface:
+listen-address=$LOCAL_IPADDR
+
+# Write the pid file:
+pid-file=${TMP}/pxe_dnsmasq.pid
+
+# Start a TFTP server:
+enable-tftp
+
+# Set the root directory for files available via FTP:
+tftp-root=/var/lib/tftpboot
+
+# The boot filename:
+dhcp-boot=/pxelinux.0
+
+# Disable re-use of the DHCP servername and filename fields as extra
+# option space. That's to avoid confusing some old or broken DHCP clients.
+dhcp-no-override
+
+# Log connections so that we can display them on the console:
+log-facility=/var/log/pxe_dnsmasq.log
+log-dhcp
+
+# Custom path for the leases file:
+dhcp-leasefile=$TMP/pxe_dnsmasq.leases
+
+# Craft a nice PXE menu:
+pxe-prompt="Press F8 for boot menu", 3
+
+# The known types are x86PC, PC98, IA64_EFI, Alpha, Arc_x86,
+# Intel_Lean_Client, IA32_EFI, BC_EFI, Xscale_EFI and X86-64_EFI
+pxe-service=X86PC, "Boot from network", /var/lib/tftpboot/pxelinux
+
+# A boot service type of 0 is special, and will abort the
+# net boot procedure and continue booting from local media.
+pxe-service=X86PC, "Boot from local hard disk", 0                               
+
+EOF
+
+  if [ -n "$LOCAL_GATEWAY" -a "$INTERFACE" = "$GLOBAL_GW_INT"  ]; then
+    # The default gw can be reached through our $INTERFACE.
+    cat <<EOF >> ${TMP}/pxe_dnsmasq.conf
+# Override the default route supplied by dnsmasq, which assumes the
+# router is the same machine as the one running dnsmasq.
+#dhcp-option=option:router,${LOCAL_GATEWAY}
+dhcp-option=3,${LOCAL_GATEWAY}
+
+EOF
+  else
+    # The default gw is reached through a second interface on the computer.
+    # We need to build a router, a bridge or a NAT firewall between the two.
+    cat <<EOF >> ${TMP}/pxe_dnsmasq.conf
+# Apply the default route supplied by dnsmasq, which assumes the
+# router is the same machine as the one running dnsmasq.
+# And we want to let our PXE clients use $INTERFACE as the default gw.
+#dhcp-option=option:router,${LOCAL_IPADDR}
+
+EOF
+  fi
+
+  if [ "$OWNDHCP" = "yes" ]; then
+    cat <<EOF >> ${TMP}/pxe_dnsmasq.conf
+# dnsmasq functions as a normal DHCP server, providing IP leases.
+dhcp-range=${MINLEASE_IP},${MAXLEASE_IP},${LOCAL_NETMASK},1h
+
+EOF
+  else
+    cat <<EOF >> ${TMP}/pxe_dnsmasq.conf
+# There is an existing DHCP server on this LAN, so dnsmasq functions
+# as a proxy DHCP server providing boot information but no IP leases.
+# Any ip in the subnet will do, so you may just put your server NIC ip here.
+dhcp-range=${LOCAL_IPADDR},proxy
+
+EOF
+  fi
+
+  # Create the pxelinux configuration file:
+  KBD=$(sed -n "s%^ */usr/bin/loadkeys *%%p" /etc/rc.d/rc.keymap 2>/dev/null)
+  cat <<EOF > /var/lib/tftpboot/pxelinux.cfg/default
+default pxelive
+prompt 1
+timeout 300
+display message.txt
+F1 message.txt
+F2 f2.txt
+F3 f3.txt
+F4 f4.txt
+label pxelive
+  kernel /generic
+  append initrd=/initrd.img load_ramdisk=1 prompt_ramdisk=0 rw printk.time=0 nfsroot=${LOCAL_IPADDR}:/mnt/livemedia luksvol= nop hostname=@DISTRO@ tz=$(cat /etc/timezone) locale=${SYSLANG:-"en_US.UTF-8"} kbd=${KBD:-"us"}
+EOF
+
+} # end of pxeconfig()
+
+# -------------------------------------------------------- #
+# Above was just initialization and function definitions.  #
+# Let's make use of all that.                              #
+# ---------------------------------------------------------#
+
+# Main loop:
+while [ 0 ]; do
+
+  if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+  $DIALOG --title "@CDISTRO@ Linux Live PXE Server (version current)" \
+    --menu \
+"Welcome to @CDISTRO@ Linux Live PXE Server.\n\
+Select an option below using the UP/DOWN keys and SPACE or ENTER.\n\
+Alternate keys may also be used: '+', '-', and TAB." 13 72 9 \
+"NETWORK" "Configure your network parameters" \
+"ACTIVATE" "Activate the @CDISTRO@ PXE Server" \
+"EXIT" "Exit @CDISTRO@ PXE Setup" 2> $TMP/hdset
+  if [ ! $? = 0 ]; then
+    rm -f $TMP/hdset $TMP/SeT*
+    exit
+  fi
+  MAINSELECT="`cat $TMP/hdset`"
+  rm $TMP/hdset
+
+  # Start checking what to do. Some modules may reset MAINSELECT to run the
+  # next item in line.
+
+  if [ "$MAINSELECT" = "NETWORK" ]; then
+    # Set up our network. We may not know anything yet in which case
+    # the variable $INTERFACE will be empty.
+    pxeconfig $INTERFACE
+    if [ -r $TMP/SeTpxe ]; then
+      MAINSELECT="ACTIVATE"
+    fi
+  fi
+ 
+  if [ "$MAINSELECT" = "ACTIVATE" ]; then
+    if [ ! -r $TMP/SeTpxe ]; then
+      if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+      $DIALOG --title "CANNOT START PXE SERVER YET" --msgbox "\
+\n\
+Before you can start the PXE Server, complete the following task:\n\
+\n\
+(*) Set up your computer's network parameters.\n\
+\n\
+Press ENTER to return to the main menu." 14 68
+      continue
+    else
+      if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+      $DIALOG --title "READY TO START PXE SERVER" --msgbox "\
+\n\
+Ready to start the PXE Server!\n\
+The PXE server log will be displayed in the next screen.
+\n\
+Press ENTER to start." 14 68
+    fi
+
+    # Time to start the BOOTP/TFTP/NFS servers:
+    echo > /var/log/pxe_dnsmasq.log
+    dnsmasq -C ${TMP}/pxe_dnsmasq.conf -z -i ${INTERFACE}
+    if ! grep -q "^/mnt/livemedia" /etc/exports ; then
+      cat <<EOT >> /etc/exports
+/mnt/livemedia  ${LOCAL_NETWORK}/${LOCAL_NETMASK}(ro,sync,insecure,no_subtree_check,root_squash)
+EOT
+    fi
+    sh /etc/rc.d/rc.nfsd restart
+    if [ "$INTERFACE" != "$GLOBAL_GW_INT" ]; then
+      # The default gateway for this computer is on another interface;
+      # we need to enable forwarding:
+      OLDROUTING=$(cat /proc/sys/net/ipv4/ip_forward)
+      echo 1 > /proc/sys/net/ipv4/ip_forward
+      # also start the route daemon:
+      if [ -z "$(pidof routed)" ]; then
+        /usr/sbin/routed -g -s
+      fi
+    else
+      OLDROUTING=""
+    fi
+
+    if [ $DEBUG -ne 0 ]; then read -p "Press ENTER to continue: " JUNK ; fi
+    $DIALOG --backtitle "Slackware PXE Server." \
+      --title "PXE Client activity log" \
+      --ok-label "EXIT" \
+      --tailbox /var/log/pxe_dnsmasq.log 20 68
+
+    # Time to kill the BOOTP/TFTP/NFS servers:
+    [ -n "$OLDROUTING" ] && echo $OLDROUTING > /proc/sys/net/ipv4/ip_forward
+    kill -TERM $(cat ${TMP}/pxe_dnsmasq.pid)
+    sh /etc/rc.d/rc.nfsd stop
+    sed -i -e "s%^/mnt/livemedia.*%#&%" /etc/exports
+  fi
+
+  if [ "$MAINSELECT" = "EXIT" ]; then
+    clear
+    break
+  fi
+
+done # end of main loop
+
+# end @CDISTRO@ Linux Live PXE Server script
+
-- 
cgit v1.2.3