source: server/bin/setserveraddr

#!/bin/bash

#/**
#@file    setserveraddr
#@brief   Assign default IP address to OpenGnsys services.
#@usage   setserveraddr { IPAddress | NetIface }
#@param   IPAddress  IP address assigned to a network interface
#@param   NetIface   network interface name defined by the operating system
#@version Initial version.
#@author  Ramón M. Gómez - ETSII Univ. Sevilla
#@date    2011-01-25
#@version 1.0.5 - Regenerate configuration files.
#@author  Ramón M. Gómez - ETSII Univ. Sevilla
#@date    2014-06-06
#@version 1.1.1 - Updating menu URLs and PXE files.
#@author  Ramón M. Gómez - ETSII Univ. Sevilla
#@date    2018-11-15
#*/ ##


# Variables.
OPENGNSYS=${OPENGNSYS:-"/opt/opengnsys"}
PXEDIRS="$OPENGNSYS/tftpboot/menu.lst $OPENGNSYS/tftpboot/grub"
DEFAULTFILE=/etc/default/opengnsys

# Functions.
source $OPENGNSYS/lib/ogfunctions.sh || exit 1

# Show help or version number.
[ "$*" == "help" ] && help
[ "$*" == "version" ] && version
# Checking parameters.
[ "$USER" != "root" ] && raiseError access "Need to be root"
[ $# -ne 1 ] && raiseError usage
[ -r $DEFAULTFILE ] || raiseError access "Cannot read default configuration file"
for f in $OPENGNSYS/{etc/{ogAdmServer,ogAdmRepo,ogAdmAgent}.cfg,www/controlacceso.php,client/etc/ogAdmClient.cfg}; do
        [ -w $f ] || raiseError access "Cannot write to file: $f"
done

# Detecting network interfaces.
DEVICES=$(ip -o link show up | awk -F: '$2!~/lo/ {print $2}')
for DEV in $DEVICES; do
        # If the network interface is found, get its IP address.
        IP=$(ip -o addr show dev "$DEV" | awk '$3~/inet$/ {sub (/\/.*/, ""); print ($4)}')
        if [ "$DEV" == "$1" ] || [ "$IP" == "$1" ]; then
                SERVERIP="$IP"
                SERVERDEV="$DEV"
        fi
done

# Checking if IP address has been detected.
if [ -n "$SERVERIP" ]; then
        # Showing warning to inform that initiated clients may hang.
        read -rp "WARNING: initiated clients can hang. Continue? (y/n): " ANSWER
        [ "${ANSWER,,}" != "y" ] && raiseError cancel "Do nothing"
        # Temporary files.
        tmpfile=$(mktemp /tmp/og.XXXXX)
        trap "rm -f $tmpfile" 1 2 3 6 9 15

        # Checking whether the DHCP settings need to be changed.
        CHANGE=0
        for f in /etc/{dhcp,hcp3}/dhcpd.conf; do
                if [ -f $f ]; then
                        # Changing DHCP "next-server" parameter.
                        file="${f/./-$SERVERDEV.}"
                        sed -e "s/next-server.*/next-server $SERVERIP;/" \
                            -e "s/option routers ;/option routers ${SERVERIP%.*}.1;/" $file >$tmpfile
                        # Copying and linking file if there are changes.
                        if [ ! $f -ef $file ] || ! diff -q $tmpfile $file &>/dev/null; then
                                mv $tmpfile $file
                                chmod 644 $file
                                ln -f $file $f
                                CHANGE=1
                        fi
                fi
        done
        # Restarting DHCP service if its configuration has changed.
        if [ $CHANGE == 1 ]; then
                for s in isc-dhcp-server dhcp3-server dhcpd; do
                        restart $s &>/dev/null && break
                done
        else
                echo "DHCP configuration has not changed."
        fi

        # Saving old IP address.
        source $OPENGNSYS/etc/ogAdmServer.cfg
        OLDSERVERIP=$ServidorAdm
        # Checking if configuration files need to be modified.
        CHANGE=0
        for f in $OPENGNSYS/{etc/{ogAdmServer,ogAdmRepo,ogAdmAgent}.cfg,www/controlacceso.php,client/etc/ogAdmClient.cfg}; do
                # Updating configuration variables (if URL does not contain "localhost").
                sed -e "s,\(ServidorAdm\|IPlocal\)=.*,\1=$SERVERIP," \
                    -e "s,^INTERFACE=.*,INTERFACE=$SERVERDEV," \
                    -e "s,UrlMenu=https?://\([^/]*\)/\(.*\),UrlMenu=https://$SERVERIP/\2," \
                    -e '/localhost/!s,https\?://[^/]*/\(.*\),https://'$SERVERIP'/\1,' $f >$tmpfile
                file="${f/./-$SERVERDEV.}"
                # Copying updated file, if needed.
                if [ ! $f -ef $file ] || ! diff -q $tmpfile $file &>/dev/null; then
                        cp $tmpfile $file
                        ln -f $file $f
                        CHANGE=1
                fi
        done

        # Processing when something has changed.
        if [ $CHANGE == 1 ]; then
                # Restart OpenGnsys services.
                echo "Restarting services..."
                restart opengnsys >/dev/null
                source $DEFAULTFILE
                # If OpenGnsys Server is active, updating the database.
                if [ "$RUN_OGADMSERVER" == "yes" ]; then
                        # Updating IP addresses and menu URLs.
                        dbexec "
UPDATE entornos
   SET ipserveradm='$SERVERIP'
 WHERE identorno=1;
UPDATE repositorios
   SET ip='$SERVERIP'
 WHERE ip='$OLDSERVERIP';
UPDATE menus
   SET htmlmenupub = REPLACE(htmlmenupub, '$OLDSERVERIP', '$SERVERIP'),
       htmlmenupri = REPLACE(htmlmenupri, '$OLDSERVERIP', '$SERVERIP');"
                        # Updating all PXE files.
                        find $PXEDIRS -name "01-*" -exec sed -i -e "s/$OLDSERVERIP/$SERVERIP/g" {} \;
                fi

                # Showing manual task to do after execution.
                cat << EOT
Default server interface set to: $SERVERDEV ($SERVERIP)

Manual tasks:
- Check DHCP configuration file and restart service, if needed.
- Check PXE files.
- Log-in as Web Console user:
  - Check menu URLs.
- Note: Run "settoken" script to update authentication tokens.
EOT
        else
                # Showing message if nothing changes.
                echo "Default interface has not changed: $1"
        fi
else
        # Error if network interface is not found.
        raiseError notfound "Network device"
fi

# Removing temporary files.
rm -f $tmpfile