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Re: Como cambiar la configuracion de un interface de red desde un script?

On Mon, 21 Mar 2005 04:50:26 +0100, midget <midworld@gmail.com> wrote:
> Hola a todos..
Hola

> Estoy escribiendo un script "preinst" para la instalación de un
> paquete mio donde le pregunto al usuario las IP's para reconfigurar
> los interface de red que luego recupero via debconf.
> 
> He estado buscando alguna uotilidad de sistema para hacer esto ya que
> si tengo que 'parsear' el /etc/network/interfaces para tocarlo,
> tendria que tocar mas cosas, como el /etc/hosts por ejemplo.
> 
> Por eso busco alguna utilidad de 'oficial' sistema para realizar
> tareas de edicion de la configuración de red.
> 
> En RedHat habia algo como 'netconf' creo recordar... (esto me pasa por
> tocar siempre las cosas a mano) :D
> 
> Bueno, eso.. si alguien conoce alguna utilidad para esto (que deje la
> configuracion del sistema consistente), que me de un toque.
La knoppix tenía una pequeña utilidad basada en ncurses,
netcardconfig, la pasteo por si es útil.

-----------------------------------------------------------------------------------------------------
#!/bin/bash
# netcardconfig - A very light-weight text-based network configuration tool.
# (C) Klaus Knopper Nov 2002

PATH="/bin:/sbin:/usr/bin:/usr/sbin"
export PATH

XDIALOG_HIGH_DIALOG_COMPAT=1
export XDIALOG_HIGH_DIALOG_COMPAT

[ "`id -u`" != "0" ] && exec sudo "$0" "$@"

TMP="/tmp/netconfig.tmp$$"

bailout(){
rm -f "$TMP"
exit $1
}

DIALOG="dialog"
[ -n "$DISPLAY" ] && [ -x /usr/bin/Xdialog ] && DIALOG="Xdialog"

[ -f /etc/sysconfig/i18n ] && . /etc/sysconfig/i18n

case "$LANGUAGE" in
de*)
MESSAGE0="Keine unterstützten Netzwerkkarte(n) gefunden."
MESSAGE1="Bitte Netzwerkkarte auswählen"
MESSAGE2="DHCP Broadcast zur Konfiguration benutzen? (Nein=manuell)"
MESSAGE3="Sende DHCP Broadcast von Netzwerkkarte"
MESSAGE4="Fehlgeschlagen."
MESSAGE5="Eingabetaste zum Beenden."
MESSAGE6="Bitte geben Sie die IP-Adresse ein für "
MESSAGE7="Bitte geben Sie die Netzwerk-Maske ein für "
MESSAGE8="Bitte geben Sie die Broadcast-Adresse ein für "
MESSAGE9="Bitte geben Sie das Default-Gateway ein"
MESSAGE10="Bitte geben Sie den/die Nameserver ein"
MESSAGE11="Setze Nameserver in /etc/resolv.conf auf "
MESSAGE12="Füge Nameserver in /etc/resolv.conf hinzu:"
;;
es)
MESSAGE0="Se han encontrado tarjetas de red no soportadas."
MESSAGE1="Por favor, seleccione el dispositivo de red"
MESSAGE2="¿Utilizar broadcast DHCP?"
MESSAGE3="Enviando broadcast DHCP desde el dispositivo"
MESSAGE4="Falló."
MESSAGE5="Pulse enter para salir."
MESSAGE6="Por favor, inserte la dirección IP para "
MESSAGE7="Por favor, inserte la máscara de red para "
MESSAGE8="Por favor, inserte la dirección de Broadcast para "
MESSAGE9="Por favor, inserte la puerta de enlace por defecto"
MESSAGE10="Por favor, inserte el(los) servidor(es) de nombres"
MESSAGE11="Poniendo los servidores de nombres de /etc/resolv.conf a "
MESSAGE12="Añadiendo servidor de nombres a /etc/resolv.conf:"
;;
esac

NETDEVICES="$(cat /proc/net/dev | awk -F: '/eth.:|tr.:|wlan.:/{print $1}')"

if [ -z "$NETDEVICES" ]; then
$DIALOG --msgbox "$MESSAGE0" 15 45
bailout
fi

count="$(echo "$NETDEVICES" | wc -w)"

if [ "$count" -gt 1 ]; then
DEVICELIST=""
for DEVICE in $NETDEVICES; do DEVICELIST="$DEVICELIST ${DEVICE}
Netzwerkkarte_${DEVICE##eth}"; done
rm -f "$TMP"
$DIALOG --menu "$MESSAGE1" 18 45 12 $DEVICELIST 2>"$TMP" || bailout
read DV <"$TMP" ; rm -f "$TMP"
else
# Remove additional spaces
DV="$(echo $NETDEVICES)"
fi

if $DIALOG --yesno "$MESSAGE2" 8 45
then
echo -n "$MESSAGE3 $DV"
pump -i $DV
rc="$?"
if [ "$rc" != "0" ]
then
echo "$MESSAGE4"
echo -n "$MESSAGE5 "
read a
else
echo " OK."
# Debian: Add dhcp broadcast entry
if [ -w /etc/network/interfaces ]; then
rm -f "$TMP"
awk '/iface/{if(/'"$DV"'/){found=1}else{found=0}}
     {if(!found){print}}
     END{print "\niface '"$DV"' inet dhcp\n\n"}' \
     /etc/network/interfaces >"$TMP"
# Add an "auto" entry
if egrep -e "^auto[     ]+.*$DV" /etc/network/interfaces; then
cat "$TMP" >/etc/network/interfaces
else
awk '{if(/^auto/){print $0 " '"$DV"'"}else{print}}' "$TMP" >
/etc/network/interfaces
fi
rm -f "$TMP"
fi
sleep 4
fi
exit $rc
fi

# RedHat
if [ -f "/etc/sysconfig/network-scripts/ifcfg-$DV" ]
then
. "/etc/sysconfig/network-scripts/ifcfg-$DV"
IP="$IPADDR"
NM="$NETMASK"
BC="$BROADCAST"
fi

# RedHat
if [ -f "/etc/sysconfig/network" ]
then
. "/etc/sysconfig/network"
DG="$GATEWAY"
fi

# Debian
if [ -f /etc/network/interfaces ]; then
awk '/iface/{if(/'"$DV"'/){found=1}else{found=0}} 
     /address/{if(found){address=$NF}}
     /netmask/{if(found){netmask=$NF}}
     /broadcast/{if(found){broadcast=$NF}}
     /gateway/{if(found){gateway=$NF}}
   END{print address" "netmask" "broadcast" "gateway}'
/etc/network/interfaces >"$TMP"
read IP NM BC DG <"$TMP"
rm -f "$TMP"
fi

$DIALOG --inputbox "$MESSAGE6 $DV" 10 45 "${IP:-192.168.0.1}" 2>"$TMP"
|| bailout 1
read IP <"$TMP" ; rm -f "$TMP"
$DIALOG --inputbox "$MESSAGE7 $DV" 10 45 "${NM:-255.255.255.0}"
2>"$TMP" || bailout 1
read NM <"$TMP" ; rm -f "$TMP"
$DIALOG --inputbox "$MESSAGE8 $DV" 10 45 "${BC:-${IP%.*}.255}"
2>"$TMP" || bailout 1
read BC <"$TMP" ; rm -f "$TMP"
$DIALOG --inputbox "$MESSAGE9" 10 45 "${DG:-${IP%.*}.254}" 2>"$TMP"
read DG <"$TMP" ; rm -f "$TMP"
if [ -f "/etc/resolv.conf" ]
then
NS="$(awk '/^nameserver/{printf "%s ",$2}' /etc/resolv.conf)"
fi
$DIALOG --inputbox "$MESSAGE10" 10 45 "${NS:-${IP%.*}.254}" 2>"$TMP"
read NS <"$TMP" ; rm -f "$TMP"

CMD="ifconfig $DV $IP netmask $NM broadcast $BC up"
echo "$CMD"
pump -k -i $DV >/dev/null 2>&1 && sleep 4
$CMD

# Add entry for Redhat init scripts
if [ -d /etc/sysconfig/network-scripts ]
then
cat >/etc/sysconfig/network-scripts/ifcfg-$DV <<EOF
DEVICE=$DV
IPADDR=$IP
NETMASK=$NM
NETWORK=${IP%.*}.0
BROADCAST=$BC
ONBOOT=yes
EOF
chmod 755 /etc/sysconfig/network-scripts/ifcfg-$DV
fi

if [ -n "$DG" ]
then
CMD="route add default gw $DG"
echo "$CMD"
$CMD
# Add entry to /etc/sysconfig/network
if [ -w /etc/sysconfig/network ]
then
grep -v ^GATEWAY /etc/sysconfig/network >"$TMP"
cat >"$TMP" <<EOF
GATEWAY=$DG
GATEWAYDEV=$DV
EOF
cat "$TMP" > /etc/sysconfig/network
rm -f "$TMP"
fi
fi

# Debian
if [ -w /etc/network/interfaces ]; then
awk '/iface/{if(/'"$DV"'/){found=1}else{found=0}}
     {if(!found){print}}
     END{print "\niface '"$DV"' inet static\n\taddress
'"$IP"'\n\tnetmask '"$NM"'\n\tnetwork '"${IP%.*}.0"'\n\tbroadcast
'"$BC"'";if("'"$DG"'"!=""){print "\tgateway '"
$DG"'"};print "\n"}' \
     /etc/network/interfaces >"$TMP"
# Add an "auto" entry
if egrep -e "^auto[     ]+.*$DV" /etc/network/interfaces; then
cat "$TMP" >/etc/network/interfaces
else
awk '{if(/^auto/){print $0 " '"$DV"'"}else{print}}' "$TMP" >
/etc/network/interfaces
fi
fi

if [ -n "$NS" ]
then
more=""
for i in $NS
do
if [ -z "$more" ]
then
more=yes
echo "$MESSAGE11 $i"
echo "nameserver $i" >/etc/resolv.conf
else
echo "$MESSAGE12 $i"
echo "nameserver $i" >>/etc/resolv.conf
fi
done
fi

egrep -q "$DV" /proc/net/wireless 2>/dev/null && wlcardconfig "$DV"

echo "Done."
sleep 2
-------------------------------------------------------------------------------------------------

> Gracias de antemano.
de nada




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