415 lines
14 KiB
Bash
Executable File
415 lines
14 KiB
Bash
Executable File
#!/bin/bash
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# postinst script for #PACKAGE#
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#
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# see: dh_installdeb(1)
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set -xe
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# summary of how this script can be called:
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# * <postinst> `configure' <most-recently-configured-version>
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# * <old-postinst> `abort-upgrade' <new version>
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# * <conflictor's-postinst> `abort-remove' `in-favour' <package>
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# <new-version>
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# * <postinst> `abort-remove'
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# * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
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# <failed-install-package> <version> `removing'
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# <conflicting-package> <version>
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# for details, see https://www.debian.org/doc/debian-policy/ or
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# the debian-policy package
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case "$1" in
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configure)
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## START gather all the info from the box and generate the variabels
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IFCONFIG="/etc/network/interfaces"
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UDEVCONFIG="/etc/udev/rules.d/70-persistent-net.rules"
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FRRCONFIG="/etc/frr/frr.conf.wit"
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IPSECCONFIG="/etc/ipsec.conf.wit"
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SWANCTLCONFIG="/etc/swanctl/conf.d/swanctl-wit.conf.wit"
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dig_txt() {
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TMPDIG=$(dig txt +short $1)
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[ -z ${TMPDIG} ] && exit 2
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TMPDIG=${TMPDIG//\//\\\/}
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TMPDIG=${TMPDIG//\"/} #" fix the god damn syntax highlighter
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echo ${TMPDIG}
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}
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dig_a() {
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TMPDIG=$(dig a +short $1)
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[ -z ${TMPDIG} ] && exit 2
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echo ${TMPDIG}
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}
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dig_aaaa() {
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TMPDIG=$(dig aaaa +short $1)
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[ -z ${TMPDIG} ] && exit 2
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echo ${TMPDIG}
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}
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LOOPBACKv4=$(dig_a ${HOSTNAME})
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LOOPBACKv6=$(dig_aaaa ${HOSTNAME})
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NODEASN=$(dig_txt asn.${HOSTNAME})
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## END variables
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## START nic config compile
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# wiping existing config in prep for re-deploying it
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mv -f ${IFCONFIG} ${IFCONFIG}.dpkg-old || true
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mv -f ${UDEVCONFIG} ${UDEVCONFIG}.dpkg-old || true
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# write loopback config
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cat <<-EOF >>$IFCONFIG
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auto lo
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iface lo inet loopback
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iface lo inet static
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address ${LOOPBACKv4}/32
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iface lo inet6 static
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address ${LOOPBACKv6}/128
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EOF
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PUBLICLOIP=$(dig_a public.${HOSTNAME}) || true
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if [[ ! -z $PUBLICLOIP ]]; then
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cat <<-EOF >>$IFCONFIG
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iface lo inet static
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address ${PUBLICLOIP}/32
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EOF
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FRR_BASTION="${FRR_BASTION}ip prefix-list ANY permit 0.0.0.0\/0 le 32\n"
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FRR_BASTION="${FRR_BASTION}route-map BASTION permit 10\n"
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FRR_BASTION="${FRR_BASTION} match ip address prefix-list ANY\n"
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FRR_BASTION="${FRR_BASTION} set src ${PUBLICLOIP}\n"
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FRR_BASTION="${FRR_BASTION}ip protocol bgp route-map BASTION\n"
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fi
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# gathering defined interfaces
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for if in mgmt mgmtgw ipmigw feth up ibgp gre; do
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for i in {1..4}; do #### for now we support/count only to 4 interfaces of each type, we can just raise this to whatever number we want (exeption mgmt)
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ifname=${if}${i}
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ifalias=$(dig_txt name.${ifname}.${HOSTNAME}) || true ## still thinking how to do this cleaner
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if [[ $ifname = gre? ]] && [[ ! -z $ifalias ]]; then
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ifmtu=$(dig_txt mtu.${ifname}.${HOSTNAME})
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local=$(dig_txt local.${ifname}.${HOSTNAME})
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localasn=$(dig_txt localasn.${ifname}.${HOSTNAME})
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remote=$(dig_txt remote.${ifname}.${HOSTNAME})
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## for the GRE tunnel to not have to deal with ibgp/full-mesh or reflectors prepending a private AS
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FRR_GRE_ASN="$localasn"
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## build FRR interface config to enable ND adv for ipv6 unmanaged
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FRR_IFS="${FRR_IFS}interface $ifname\n"
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FRR_IFS="${FRR_IFS} description $ifalias\n"
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FRR_IFS="${FRR_IFS} ipv6 nd ra-interval 10\n"
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FRR_IFS="${FRR_IFS} no ipv6 nd suppress-ra\n!\n"
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## build FRR neightbor interfaces
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FRR_EDGE_NEIGH=" !!! neighbor $ifname interface peer-group GRE\n$FRR_EDGE_NEIGH"
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## build regular linux network interface config
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cat <<-EOF >>$IFCONFIG
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auto $ifname
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iface $ifname inet manual
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## $ifalias
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pre-up ip tunnel add $ifname mode gre local $local remote $remote
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down ip tunnel del $ifname
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mtu $ifmtu
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EOF
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fi
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## blow we deal with real physical interfaces
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## it is crucial that this `ifmac` block is above the rest, since if no mac is returned it will skip the loop and prevent the package install to fail
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if [[ $ifname = mgmt1 ]] || [[ $ifname = mgmtgw1 ]] || [[ $ifname = ipmigw1 ]] ## we only support a single interface of these types and they are handled slightly differently in DNS
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then
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ifmac=$(dig_txt mac.${if}.${HOSTNAME}) || continue ## at this point skip the rest of the loop for interfaces that do not have a mac defined (those are basically not configured)
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else
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ifmac=$(dig_txt mac.${ifname}.${HOSTNAME}) || continue ## at this point skip the rest of the loop for interfaces that do not have a mac defined
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fi
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echo 'SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="'${ifmac}'", ATTR{type}=="1", NAME="'${ifname}'"' >>$UDEVCONFIG
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if [[ $ifname = up? ]]; then
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ipv4=$(dig_txt ipv4.$ifname.${HOSTNAME})
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ipv6=$(dig_txt ipv6.$ifname.${HOSTNAME})
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peerv4=$(dig_txt peerv4.$ifname.${HOSTNAME}) || true ## we dont know if we will always have both available
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peerv6=$(dig_txt peerv6.$ifname.${HOSTNAME}) || true ## we dont know if we will always have both available
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[ -z $peerv4 ] || FRR_EDGE_NEIGH=" !!! neighbor $peerv4 peer-group eBGPv4\n$FRR_EDGE_NEIGH"
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[ -z $peerv6 ] || FRR_EDGE_NEIGH=" !!! neighbor $peerv6 peer-group eBGPv6\n$FRR_EDGE_NEIGH"
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cat <<-EOF >>$IFCONFIG
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auto $ifname
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iface $ifname inet static
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address ${ipv4/\\/}
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mtu 9000
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iface $ifname inet6 static
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address ${ipv6/\\/}
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dad-attempts 0
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EOF
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fi
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if [[ $ifname = ibgp? ]]; then
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## build FRR interface config to enable ND adv for ipv6 unmanaged
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FRR_IFS="${FRR_IFS}interface $ifname\n"
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FRR_IFS="${FRR_IFS} ipv6 nd ra-interval 10\n"
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FRR_IFS="${FRR_IFS} no ipv6 nd suppress-ra\n!\n"
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## build FRR neightbor interfaces
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FRR_EDGE_NEIGH=" !!! neighbor $ifname interface peer-group iBGP\n$FRR_EDGE_NEIGH"
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cat <<-EOF >>$IFCONFIG
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auto $ifname
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iface $ifname inet manual
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mtu 9000
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EOF
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fi
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if [[ $ifname = feth? ]]; then
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cat <<-EOF >>$IFCONFIG
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auto $ifname
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iface $ifname inet manual
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mtu 9000
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EOF
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fi
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if [[ $ifname = mgmt1 ]]; then ## only 1 mgmt interface supported for now
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cat <<-EOF >>$IFCONFIG
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auto $ifname
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iface $ifname inet6 auto
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iface $ifname inet dhcp
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pre-up /bin/ip link add mgmt type vrf table mgmt
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pre-up /bin/ip link set up dev mgmt
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pre-up /bin/ip link set master mgmt dev $ifname
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post-down /bin/ip link del dev mgmt
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EOF
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fi
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if [[ $ifname = mgmtgw1 ]] || [[ $ifname = ipmigw1 ]]; then ## only 1 mgmt interface supported for now
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ipv4=$(dig_txt ipv4.$if.${HOSTNAME})
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cat <<-EOF >>$IFCONFIG
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auto ${ifname}
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iface ${ifname} inet static
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address ${ipv4/\\/}
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EOF
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fi
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done
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done
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## STOP nic config compile
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## START compiling frr and ipsec dynamic config blocks
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## compile public IP space prefix lists, this is what's going to be advertised out the upstream provider
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i=1
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while true; do
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TEMP="$(dig_txt $i.ipv4.public.prefixlist.usw2.admin.wit.com)" || break
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TEMPAGGS=" !!! aggregate-address ${TEMP}\n"
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FRR_IPV4_EDGE_SUMMARIES_AGGREGATS="${FRR_IPV4_EDGE_SUMMARIES_AGGREGATS}${TEMPAGGS}"
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TEMPSUM="!!! ip prefix-list WITv4-SUMMARIES seq $((i*5)) permit ${TEMP}\n"
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FRR_IPV4_EDGE_SUMMARIES_PFLIST="${FRR_IPV4_EDGE_SUMMARIES_PFLIST}${TEMPSUM}"
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let i+=1
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done
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i=1
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while true; do
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TEMP="$(dig_txt $i.ipv6.public.prefixlist.usw2.admin.wit.com)" || break
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TEMPAGGS=" !!! aggregate-address ${TEMP}\n"
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FRR_IPV6_EDGE_SUMMARIES_AGGREGATS="${FRR_IPV6_EDGE_SUMMARIES_AGGREGATS}${TEMPAGGS}"
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TEMPSUM="!!! ipv6 prefix-list WITv6-SUMMARIES seq $((i*5)) permit ${TEMP}\n"
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FRR_IPV6_EDGE_SUMMARIES_PFLIST="${FRR_IPV6_EDGE_SUMMARIES_PFLIST}${TEMPSUM}"
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let i+=1
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done
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## compile customer IP blocks that we accept. this in theory should be a combination of *all* public blocks used accross regions while limiting it a smaller subnet size
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i=1
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while true; do
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TEMP="$(dig_txt $i.ipv4.customers.prefixlist.usw2.admin.wit.com)" || break
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TEMPSUM="ip prefix-list WITv4-CUSTOMERS seq $((i*5)) permit ${TEMP} ge 25\n"
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FRR_IPV4_CUSTOMERS_PFLIST="${FRR_IPV4_CUSTOMERS_PFLIST}${TEMPSUM}"
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let i+=1
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done
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i=1
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while true; do
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TEMP="$(dig_txt $i.ipv6.customers.prefixlist.usw2.admin.wit.com)" || break
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TEMPSUM="ipv6 prefix-list WITv6-CUSTOMERS seq $((i*5)) permit ${TEMP} ge 64\n"
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FRR_IPV6_CUSTOMERS_PFLIST="${FRR_IPV6_CUSTOMERS_PFLIST}${TEMPSUM}"
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let i+=1
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done
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## compile loopback IP blocks that we wanna accept to be injected into the bgp
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i=1
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while true; do
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TEMP="$(dig_txt $i.ipv4.loopback.prefixlist.usw2.admin.wit.com)" || break
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TEMPSUM="ip prefix-list LOOPBACKv4 seq $((i*5)) permit ${TEMP} ge 32\n"
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FRR_IPV4_LOOPBACK_PFLIST="${FRR_IPV4_LOOPBACK_PFLIST}${TEMPSUM}"
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[ -z $IPSEC_IPV4_SUBNETS ] || IPSEC_IPV4_SUBNETS="${IPSEC_IPV4_SUBNETS},"
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IPSEC_IPV4_SUBNETS="${IPSEC_IPV4_SUBNETS}${TEMP}"
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let i+=1
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done
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i=1
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while true; do
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TEMP="$(dig_txt $i.ipv6.loopback.prefixlist.usw2.admin.wit.com)" || break
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TEMPSUM="ipv6 prefix-list LOOPBACKv6 seq $((i*5)) permit ${TEMP} ge 128\n"
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FRR_IPV6_LOOPBACK_PFLIST="${FRR_IPV6_LOOPBACK_PFLIST}${TEMPSUM}"
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[ -z $IPSEC_IPV6_SUBNETS ] || IPSEC_IPV6_SUBNETS="${IPSEC_IPV6_SUBNETS},"
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IPSEC_IPV6_SUBNETS="${IPSEC_IPV6_SUBNETS}${TEMP}"
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let i+=1
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done
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## STOP compiling frr config
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## START writing config files
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# set frr config
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sed -i \
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-e "s/^!!! FRR_BASTION/$FRR_BASTION/" \
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-e "s/^!!! FRR_IFS/$FRR_IFS/" \
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-e "s/^ !!! FRR_EDGE_NEIGH/$FRR_EDGE_NEIGH/" \
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-e "s/^ !!! FRR_IPV4_EDGE_SUMMARIES_AGGREGATS/$FRR_IPV4_EDGE_SUMMARIES_AGGREGATS/" \
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-e "s/^ !!! FRR_IPV6_EDGE_SUMMARIES_AGGREGATS/$FRR_IPV6_EDGE_SUMMARIES_AGGREGATS/" \
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-e "s/^!!! FRR_IPV4_EDGE_SUMMARIES_PFLIST/$FRR_IPV4_EDGE_SUMMARIES_PFLIST/" \
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-e "s/^!!! FRR_IPV6_EDGE_SUMMARIES_PFLIST/$FRR_IPV6_EDGE_SUMMARIES_PFLIST/" \
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-e "s/^!!! FRR_IPV4_CUSTOMERS_PFLIST/$FRR_IPV4_CUSTOMERS_PFLIST/" \
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-e "s/^!!! FRR_IPV6_CUSTOMERS_PFLIST/$FRR_IPV6_CUSTOMERS_PFLIST/" \
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-e "s/^!!! FRR_IPV4_LOOPBACK_PFLIST/$FRR_IPV4_LOOPBACK_PFLIST/" \
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-e "s/^!!! FRR_IPV6_LOOPBACK_PFLIST/$FRR_IPV6_LOOPBACK_PFLIST/" \
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-e "s/FRR_GRE_ASN/${FRR_GRE_ASN}/" \
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-e "s/FRRROUTERID/${LOOPBACKv4}/" \
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-e "s/NODEASN/${NODEASN}/" \
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$FRRCONFIG
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[ -z $FRR_EDGE_NEIGH ] || sed -i -e 's/!!! //' $FRRCONFIG
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# set ipsec config
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for IPSECCONFIGFILE in $IPSECCONFIG $SWANCTLCONFIG
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do
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sed -i \
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-e "s/FQHOSTNAME/${HOSTNAME}/" \
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-e "s/LOOPBACKv4/${LOOPBACKv4}\/32/" \
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-e "s/LOOPBACKv6/${LOOPBACKv6}\/128/" \
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-e "s/IPSEC_IPV4_SUBNETS/$IPSEC_IPV4_SUBNETS/" \
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-e "s/IPSEC_IPV6_SUBNETS/$IPSEC_IPV6_SUBNETS/" \
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$IPSECCONFIGFILE
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done
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echo ": RSA ${HOSTNAME}.key" >/etc/ipsec.secrets
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chown frr.frr $FRRCONFIG /etc/frr/daemons.wit
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# wite grub rules for serial terminal
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sed -i -e '/GRUB_CMDLINE_LINUX_DEFAULT=/d' -e '/GRUB_CMDLINE_LINUX=/d' -e '/GRUB_SERIAL_COMMAND=/d' -e '/GRUB_TERMINAL=/d' /etc/default/grub
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cat <<-EOF >>/etc/default/grub
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GRUB_CMDLINE_LINUX_DEFAULT=""
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GRUB_CMDLINE_LINUX="console=tty0 console=ttyS1,115200n8"
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GRUB_TERMINAL=serial
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GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=1 --word=8 --parity=no --stop=1"
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EOF
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# disable password logins on ssh
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sed -i -e '/#*\s*PasswordAuthentication /d' /etc/ssh/sshd_config
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echo "PasswordAuthentication no" >>/etc/ssh/sshd_config
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## END config file section
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## START configuring services as we need it
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#systemctl disable strongswan # disable ipsec till we have the certs and all ansible will enable it after dropping certs
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systemctl enable firewall
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systemctl enable systemd-timesyncd
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systemctl restart systemd-timesyncd
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systemctl restart ssh
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update-grub
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sysctl -p /etc/sysctl.d/10-frr.conf
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## END services section
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;;
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abort-upgrade|abort-remove|abort-deconfigure)
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;;
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*)
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echo "postinst called with unknown argument \`$1'" >&2
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exit 1
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;;
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esac
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# dh_installdeb will replace this with shell code automatically
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# generated by other debhelper scripts.
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#DEBHELPER#
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exit 0
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