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scripts/multi-homed-routing.pl  view on Meta::CPAN

# This script is auto-generated output of command:
# \\\$ [% cmd_line %]


# This script can be called as part of SysV initscripts.
# For example, in RedHat Linux, symlink this as file /sbin/ifup-local
# See Red Hat Enterprise Linux7 Networking Guide for details.

# This script can be called as a NetworkManager dispatcher.
# Symlink this script in directory /etc/NetworkManager/dispatcher.d/



# Agument handling:
IFUP_DEVICE=
if [ \\\$# -gt 0 ]; then
    # Check if --argument or inteface name
    if [[ \\\$1 != --* ]]; then
        # Assume SysV init or Networkmanager interface name
        IFUP_DEVICE=\\\$1
        shift

        # Networkmanager?
        if [ \\\$# -gt 0 ]; then
            ACTION=\\\$1
            shift
            if [ "\\\$ACTION" != "up" ]; then
                # Run only on interface-up.
                exit
            fi
        fi
    fi
fi

# Id for this ruleset:
RULES_ID="[% rules_id %]"
RULES_DIR="/var/cache/routing-rules"
IP_TOOL=/sbin/ip

# Set up my interfaces
[% FOREACH if IN interfaces %]
IF[% if.table %]_DEVICE=[% if.device %]

IF[% if.table %]_IP=[% if.address %]

IF[% if.table %]_NET=[% if.network %]

[% IF if.gateway %]
IF[% if.table %]_GW=[% if.gateway %]

[% END %]
[% IF if.weight %]
IF[% if.table %]_WEIGHT=[% if.weight %]

[% END %]

[% END %]

# Helper functions
function verify_ip() {
    local IP
    local device=\\\$1
    local IP_in=\\\$2

    IP=\\\$(\\\$IP_TOOL -4 -o addr show dev \\\$device 2> /dev/null)
    if [[ \\\$IP =~ inet[[:space:]]+([0-9.]+)/ ]]; then
        if [ \\\${BASH_REMATCH\[1\]} != \\\$IP_in ]; then
            echo "IP-address for \\\$device expected to be \\\$IP_in, got \\\${BASH_REMATCH\[1\]}."
            echo "Re-run multi-homed-routing.pl to update routing setup."
            return 1
        fi
    else
        echo "Failed to parse IP-address for interface \\\$device."
        echo "Probably interface is not up. Routing setup called too early?"
        return 5
    fi

    return 0
}

# Keep track of interfaces. We need all of them for this to work properly.
fail_cnt=0

[% FOREACH if IN interfaces %]
# Check interface [% if.device %]

verify_ip \\\$IF[% if.table %]_DEVICE \\\$IF[% if.table %]_IP
if [ \\\$? -eq 0 ]; then
    # Add table [% if.table %] for interface [% if.device %]
 
    \\\$IP_TOOL route flush table [% if.table %]

[% FOREACH if2 IN interfaces %]
[% other_device = if2.device %][% IF if.device == if2.device %]
    \\\$IP_TOOL route add \\\$IF[% if2.table %]_NET dev \\\$IF[% if2.table %]_DEVICE src \\\$IF[% if2.table %]_IP table [% if.table %]

[% ELSIF if.crossref.\$other_device == 1 %]
    \\\$IP_TOOL route add \\\$IF[% if2.table %]_NET dev \\\$IF[% if2.table %]_DEVICE table [% if.table %]

[% ELSE %]
    # Not adding. Shares same network [% if.network %]:
    #\\\$IP_TOOL route add [% if2.network %] dev [% if2.device %] table [% if.table %]

[% END %]
[% END %]
[% FOREACH route IN if.add_routes %]
    \\\$IP_TOOL route add [% route %] table [% if.table %]

[% END %]
    \\\$IP_TOOL route add 169.254.0.0/16 dev \\\$IF[% if.table %]_DEVICE scope link metric [% if.apipa_metric %] table [% if.table %]

    \\\$IP_TOOL route add 127.0.0.0/8 dev lo table [% if.table %]
[% IF if.gateway %]

    \\\$IP_TOOL route add default via \\\$IF[% if.table %]_GW table [% if.table %]
[% END %]

else
    fail_cnt=\\\$((fail_cnt+1))
fi

[% END %]
# Proceed routing setup only if all interfaces are ok.
if [ \\\$fail_cnt -gt 0 ]; then
    exit 1
fi


# Save existing, if running the first time:
if [ -e "\\\${RULES_DIR}" ] && [ ! -e "\\\${RULES_DIR}/\\\${RULES_ID}.original" ]; then
    SAVE_FILENAME="\\\${RULES_DIR}/\\\$RULES_ID.original"
    echo "# Rules saved at: \\\$(date +"%F %H:%M:%S")" > "\\\$SAVE_FILENAME"
    echo "# ip rule list:" >> "\\\$SAVE_FILENAME"
    echo "\\\$(\\\$IP_TOOL rule list)" >> "\\\$SAVE_FILENAME"
    echo "# ip route show all (table main)" >> "\\\$SAVE_FILENAME"
    echo "\\\$(\\\$IP_TOOL route show all)" >> "\\\$SAVE_FILENAME"
[% FOREACH if IN interfaces %]
#    echo "# ip route show all table [% if.table %]" >> "\\\$SAVE_FILENAME"
#    echo "\\\$(\\\$IP_TOOL route show all table [% if.table %])" >> "\\\$SAVE_FILENAME"
[% END %]
fi


# All good. Set up my main routing table
\\\$IP_TOOL route flush all table main
[% FOREACH if IN interfaces %]
[% IF if.in_main_table %]