CasperSecurity
#!/bin/sh
# dhcpcd client configuration script
# Handy variables and functions for our hooks to use
ifname="$interface${protocol+.}$protocol"
from=from
signature_base="# Generated by dhcpcd"
signature="$signature_base $from $ifname"
signature_base_end="# End of dhcpcd"
signature_end="$signature_base_end $from $ifname"
state_dir=/run/dhcpcd/hook-state
_detected_init=false
: ${if_up:=false}
: ${if_down:=false}
: ${syslog_debug:=false}
# Ensure that all arguments are unique
uniqify()
{
result=
for i do
case " $result " in
*" $i "*);;
*) result="$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()
{
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 $ifaces
}
# Trim function
trim()
{
var="$*"
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()
{
key="$1"
shift
if command -v sed >/dev/null 2>&1; then
sed -n "s/^$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()
{
m1="$1"
m2="$2"
in_marker=0
shift; shift
if command -v sed >/dev/null 2>&1; then
sed "/^$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" ] && [ -e "$2" ] || return 1
if command -v cmp >/dev/null 2>&1; then
cmp -s "$1" "$2"
elif command -v 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()
{
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: $*";;
esac
if command -v logger >/dev/null 2>&1; then
logger -i -p daemon."$lvl" -t dhcpcd-run-hooks "$interface: $*"
fi
}
# Check for a valid name as per RFC952 and RFC1123 section 2.1
valid_domainname()
{
name="$1"
[ -z "$name" ] || [ ${#name} -gt 255 ] && return 1
while [ -n "$name" ]; do
label="${name%%.*}"
[ -z "$label" ] || [ ${#label} -gt 63 ] && return 1
case "$label" in
-*|_*|*-|*_) return 1;;
*[![:alnum:]_-]*) return 1;;
"$name") return 0;;
esac
name="${name#*.}"
done
return 0
}
valid_domainname_list()
{
for name do
valid_domainname "$name" || return $?
done
return 0
}
# With the advent of alternative init systems, it's possible to have
# more than one installed. So we need to try to guess what one we're
# using unless overridden by configure.
detect_init()
{
_service_exists=""
_service_cmd=""
_service_status=""
[ -n "$_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.
status=""
: ${status:=status}
if [ -x /bin/systemctl ] && [ -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 --no-block \$1.service"
elif [ -x /usr/bin/systemctl ] && [ -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 --no-block \$1.service"
elif [ -x /sbin/rc-service ] &&
{ [ -s /libexec/rc/init.d/softlevel ] ||
[ -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 \$2 \$1"
elif [ -x /usr/bin/sv ]; then
_service_exists="/usr/bin/sv status \$1 >/dev/null 2>&1"
_service_cmd="/usr/bin/sv \$2 \$1"
elif [ -e /etc/slackware-version ] && [ -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" ] && [ -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 $2
}
# We source each script into this one so that scripts run earlier can
# remove variables from the environment so later scripts don't see them.
# Thus, the user can create their dhcpcd.enter/exit-hook script to configure
# /etc/resolv.conf how they want and stop the system scripts ever updating it.
for hook in \
/etc/dhcpcd.enter-hook \
/usr/lib/dhcpcd/dhcpcd-hooks/* \
/etc/dhcpcd.exit-hook
do
case "$hook" in
*/*~) continue;;
esac
for skip in $skip_hooks; do
case "$hook" in
*/"$skip") continue 2;;
*/[0-9][0-9]"-$skip") continue 2;;
*/[0-9][0-9]"-$skip.sh") continue 2;;
esac
done
if [ -f "$hook" ]; then
. "$hook"
fi
done