This file is indexed.

/etc/NetworkManager/dispatcher.d/01ifupdown is in network-manager 1.1.93-0ubuntu4.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
#!/bin/sh -e
# Script to dispatch NetworkManager events
#
# Runs ifupdown scripts when NetworkManager fiddles with interfaces.
# See NetworkManager(8) for further documentation of the dispatcher events.

if [ -z "$1" ]; then
    echo "$0: called with no interface" 1>&2
    exit 1;
fi

if [ -n "$IP4_NUM_ADDRESSES" ] && [ "$IP4_NUM_ADDRESSES" -gt 0 ]; then
   ADDRESS_FAMILIES="$ADDRESS_FAMILIES inet"
fi
if [ -n "$IP6_NUM_ADDRESSES" ] && [ "$IP6_NUM_ADDRESSES" -gt 0 ]; then
   ADDRESS_FAMILIES="$ADDRESS_FAMILIES inet6"
fi

# If we have a VPN connection ignore the underlying IP address(es)
if [ "$2" = "vpn-up" ] || [ "$2" = "vpn-down" ]; then
   ADDRESS_FAMILIES=""
fi

if [ -n "$VPN_IP4_NUM_ADDRESSES" ] && [ "$VPN_IP4_NUM_ADDRESSES" -gt 0 ]; then
   ADDRESS_FAMILIES="$ADDRESS_FAMILIES inet"
fi
if [ -n "$VPN_IP6_NUM_ADDRESSES" ] && [ "$VPN_IP6_NUM_ADDRESSES" -gt 0 ]; then
   ADDRESS_FAMILIES="$ADDRESS_FAMILIES inet6"
fi

# We're probably bringing the interface down.
[ -n "$ADDRESS_FAMILIES" ] || ADDRESS_FAMILIES="inet"

# Fake ifupdown environment
export IFACE="$1"
export LOGICAL="$1"
export METHOD="NetworkManager"
export VERBOSITY="0"

for i in $ADDRESS_FAMILIES; do

    export ADDRFAM="$i"

    # Run the right scripts
    case "$2" in
        up|vpn-up)
            export MODE="start"
            export PHASE="post-up"
            run-parts /etc/network/if-up.d
            ;;
        down|vpn-down)
            export MODE="stop"
            export PHASE="post-down"
            run-parts /etc/network/if-post-down.d
            ;;
# pre-up/pre-down not implemented. See
# https://bugzilla.gnome.org/show_bug.cgi?id=387832
#        pre-up)
#            export MODE="start"
#            export PHASE="pre-up"
#            run-parts /etc/network/if-pre-up.d
#            ;;
#        pre-down)
#            export MODE="stop"
#            export PHASE="pre-down"
#            run-parts /etc/network/if-down.d
#            ;;
        hostname|dhcp4-change|dhcp6-change)
            # Do nothing
            ;;
        *)
            echo "$0: called with unknown action \`$2'" 1>&2
            exit 1
            ;;
    esac
done