/lib/dhcpcd/dhcpcd-run-hooks is in dhcpcd5 6.11.5-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# dhcpcd client configuration script
# Handy variables and functions for our hooks to use
case "$reason" in
ROUTERADVERT)
ifsuffix=".ra";;
INFORM6|BOUND6|RENEW6|REBIND6|REBOOT6|EXPIRE6|RELEASE6|STOP6)
ifsuffix=".dhcp6";;
IPV4LL)
ifsuffix=".ipv4ll";;
*)
ifsuffix=".dhcp";;
esac
ifname="$interface$ifsuffix"
from=from
signature_base="# Generated by dhcpcd"
signature="$signature_base $from $ifname"
signature_base_end="# End of dhcpcd"
signature_end="$signature_base_end $from $ifname"
state_dir=/var/run/dhcpcd
_detected_init=false
: ${if_up:=false}
: ${if_down:=false}
: ${syslog_debug:=false}
# Ensure that all arguments are unique
uniqify()
{
local result= i=
for i do
case " $result " in
*" $i "*);;
*) result="$result $i";;
esac
done
echo "${result# *}"
}
# List interface config files in a directory.
# If dhcpcd is running as a single instance then it will have a list of
# interfaces in the preferred order.
# Otherwise we just use what we have.
list_interfaces()
{
local i= x= ifaces=
for i in $interface_order; do
for x in "$1"/$i.*; do
[ -f "$x" ] && ifaces="$ifaces${ifaces:+ }${x##*/}"
done
done
for x in "$1"/*; do
[ -f "$x" ] && ifaces="$ifaces${ifaces:+ }${x##*/}"
done
uniqify $ifaces
}
# Trim function
trim()
{
local var="$*"
var=${var#"${var%%[![:space:]]*}"}
var=${var%"${var##*[![:space:]]}"}
if [ -z "$var" ]; then
# So it seems our shell doesn't support wctype(3) patterns
# Fall back to sed
var=$(echo "$*" | sed -e 's/^[[:space:]]*//;s/[[:space:]]*$//')
fi
printf %s "$var"
}
# We normally use sed to extract values using a key from a list of files
# but sed may not always be available at the time.
key_get_value()
{
local key="$1" value= x= line=
shift
if type sed >/dev/null 2>&1; then
sed -n "s/^$key//p" $@
else
for x do
while read line; do
case "$line" in
"$key"*) echo "${line##$key}";;
esac
done < "$x"
done
fi
}
# We normally use sed to remove markers from a configuration file
# but sed may not always be available at the time.
remove_markers()
{
local m1="$1" m2="$2" x= line= in_marker=0
shift; shift
if type sed >/dev/null 2>&1; then
sed "/^$m1/,/^$m2/d" $@
else
for x do
while read line; do
case "$line" in
"$m1"*) in_marker=1;;
"$m2"*) in_marker=0;;
*) [ $in_marker = 0 ] && echo "$line";;
esac
done < "$x"
done
fi
}
# Compare two files.
comp_file()
{
[ -e "$1" -a -e "$2" ] || return 1
if type cmp >/dev/null 2>&1; then
cmp -s "$1" "$2"
elif type diff >/dev/null 2>&1; then
diff -q "$1" "$2" >/dev/null
else
# Hopefully we're only working on small text files ...
[ "$(cat "$1")" = "$(cat "$2")" ]
fi
}
# Compare two files.
# If different, replace first with second otherwise remove second.
change_file()
{
if [ -e "$1" ]; then
if comp_file "$1" "$2"; then
rm -f "$2"
return 1
fi
fi
cat "$2" > "$1"
rm -f "$2"
return 0
}
# Compare two files.
# If different, copy or link depending on target type
copy_file()
{
if [ -h "$2" ]; then
[ "$(readlink "$2")" = "$1" ] && return 1
ln -sf "$1" "$2"
else
comp_file "$1" "$2" && return 1
cat "$1" >"$2"
fi
}
# Save a config file
save_conf()
{
if [ -f "$1" ]; then
rm -f "$1-pre.$interface"
cat "$1" > "$1-pre.$interface"
fi
}
# Restore a config file
restore_conf()
{
[ -f "$1-pre.$interface" ] || return 1
cat "$1-pre.$interface" > "$1"
rm -f "$1-pre.$interface"
}
# Write a syslog entry
syslog()
{
local lvl="$1"
if [ "$lvl" = debug ]; then
${syslog_debug} || return 0
fi
[ -n "$lvl" ] && shift
[ -n "$*" ] || return 0
case "$lvl" in
err|error) echo "$interface: $*" >&2;;
*) echo "$interface: $*";;
esac
if type logger >/dev/null 2>&1; then
logger -i -p daemon."$lvl" -t dhcpcd-run-hooks "$interface: $*"
fi
}
# Check for a valid domain name as per RFC1123 with the exception of
# allowing - and _ as they seem to be widely used.
valid_domainname()
{
local name="$1" label
[ -z "$name" -o ${#name} -gt 255 ] && return 1
while [ -n "$name" ]; do
label="${name%%.*}"
[ -z "$label" -o ${#label} -gt 63 ] && return 1
case "$label" in
-*|_*|*-|*_) return 1;;
# some sh require - as the first or last character in the class
# when matching it
*[![:alnum:]_-]*) return 1;;
esac
[ "$name" = "${name#*.}" ] && break
name="${name#*.}"
done
return 0
}
valid_domainname_list()
{
local name
for name do
valid_domainname "$name" || return $?
done
return 0
}
# Check for a valid path
valid_path()
{
case "$@" in
*[![:alnum:]#%+-_:\.,@~\\/\[\]=\ ]*) return 1;;
esac
return 0
}
# With the advent of alternative init systems, it's possible to have
# more than one installed. So we need to try and guess what one we're
# using unless overriden by configure.
detect_init()
{
_service_exists=""
_service_cmd=""
_service_status=""
[ -n "$_service_cmd" ] && return 0
if ${_detected_init}; then
[ -n "$_service_cmd" ]
return $?
fi
# Detect the running init system.
# As systemd and OpenRC can be installed on top of legacy init
# systems we try to detect them first.
local status=""
: ${status:=status}
if [ -x /bin/systemctl -a -S /run/systemd/private ]; then
_service_exists="/bin/systemctl --quiet is-enabled \$1.service"
_service_status="/bin/systemctl --quiet is-active \$1.service"
_service_cmd="/bin/systemctl \$2 \$1.service"
elif [ -x /usr/bin/systemctl -a -S /run/systemd/private ]; then
_service_exists="/usr/bin/systemctl --quiet is-enabled \$1.service"
_service_status="/usr/bin/systemctl --quiet is-active \$1.service"
_service_cmd="/usr/bin/systemctl \$2 \$1.service"
elif [ -x /sbin/rc-service -a \
-s /libexec/rc/init.d/softlevel -o -s /run/openrc/softlevel ]
then
_service_exists="/sbin/rc-service -e \$1"
_service_cmd="/sbin/rc-service \$1 -- -D \$2"
elif [ -x /usr/sbin/invoke-rc.d ]; then
_service_exists="/usr/sbin/invoke-rc.d --query --quiet \$1 start >/dev/null 2>&1 || [ \$? = 104 ]"
_service_cmd="/usr/sbin/invoke-rc.d \$1 \$2"
elif [ -x /sbin/service ]; then
_service_exists="/sbin/service \$1 >/dev/null 2>&1"
_service_cmd="/sbin/service \$1 \$2"
elif [ -x /usr/sbin/service ]; then
_service_exists="/usr/sbin/service \$1 $status >/dev/null 2>&1"
_service_cmd="/usr/sbin/service \$1 \$2"
elif [ -x /bin/sv ]; then
_service_exists="/bin/sv status \1 >/dev/null 2>&1"
_service_cmd="/bin/sv \$1 \$2"
elif [ -x /usr/bin/sv ]; then
_service_exists="/usr/bin/sv status \1 >/dev/null 2>&1"
_service_cmd="/usr/bin/sv \$1 \$2"
elif [ -e /etc/slackware-version -a -d /etc/rc.d ]; then
_service_exists="[ -x /etc/rc.d/rc.\$1 ]"
_service_cmd="/etc/rc.d/rc.\$1 \$2"
_service_status="/etc/rc.d/rc.\$1 status >/dev/null 2>&1"
else
for x in /etc/init.d/rc.d /etc/rc.d /etc/init.d; do
if [ -d $x ]; then
_service_exists="[ -x $x/\$1 ]"
_service_cmd="$x/\$1 \$2"
_service_status="$x/\$1 $status >/dev/null 2>&1"
break
fi
done
if [ -e /etc/arch-release ]; then
_service_status="[ -e /var/run/daemons/\$1 ]"
elif [ "$x" = "/etc/rc.d" -a -e /etc/rc.d/rc.subr ]; then
_service_status="$x/\$1 check >/dev/null 2>&1"
fi
fi
_detected_init=true
if [ -z "$_service_cmd" ]; then
syslog err "could not detect a useable init system"
return 1
fi
return 0
}
# Check a system service exists
service_exists()
{
if [ -z "$_service_exists" ]; then
detect_init || return 1
fi
eval $_service_exists
}
# Send a command to a system service
service_cmd()
{
if [ -z "$_service_cmd" ]; then
detect_init || return 1
fi
eval $_service_cmd
}
# Send a command to a system service if it is running
service_status()
{
if [ -z "$_service_cmd" ]; then
detect_init || return 1
fi
if [ -n "$_service_status" ]; then
eval $_service_status
else
service_command $1 status >/dev/null 2>&1
fi
}
# Handy macros for our hooks
service_command()
{
service_exists $1 && service_cmd $1 $2
}
service_condcommand()
{
service_exists $1 && service_status $1 && service_cmd $1 $2
}
# We source each script into this one so that scripts run earlier can
# remove variables from the environment so later scripts don't see them.
# Thus, the user can create their dhcpcd.enter/exit-hook script to configure
# /etc/resolv.conf how they want and stop the system scripts ever updating it.
for hook in \
/etc/dhcpcd.enter-hook \
/lib/dhcpcd/dhcpcd-hooks/* \
/etc/dhcpcd.exit-hook
do
for skip in $skip_hooks; do
case "$hook" in
*/*~) continue 2;;
*/"$skip") continue 2;;
*/[0-9][0-9]"-$skip") continue 2;;
*/[0-9][0-9]"-$skip.sh") continue 2;;
esac
done
if [ -f "$hook" ]; then
. "$hook"
fi
done
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