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#!/bin/sh
# dhcpcd client configuration script
# Handy variables and functions for our hooks to use
from="from"
signature_base="# Generated by dhcpcd"
signature="${signature_base} ${from} ${interface}"
signature_base_end="# End of dhcpcd"
signature_end="${signature_base_end} ${from} ${interface}"
state_dir="/var/run/dhcpcd"
# Ensure that all arguments are unique
uniqify()
{
local result=
while [ -n "$1" ]; do
case " ${result} " in
*" $1 "*);;
*) result="${result}${result:+ }$1";;
esac
shift
done
echo "${result}"
}
# List interface config files in a dir
# We may wish to control the order at some point rather than just lexical
list_interfaces()
{
local x= interfaces=
for x in "$1"/*; do
[ -e "${x}" ] || continue
interfaces="${interfaces}${interfaces:+ }${x##*/}"
done
echo "${interfaces}"
}
# 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
# If different, replace first with second otherwise remove second
change_file()
{
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
if [ $? -eq 0 ]; then
rm -f "$2"
return 1
fi
mv -f "$2" "$1"
return 0
}
# Save a config file
save_conf()
{
if [ -f "$1" ]; then
rm -f "$1"-pre."${interface}"
mv -f "$1" "$1"-pre."${interface}"
fi
}
# Restore a config file
restore_conf()
{
[ -f "$1"-pre."${interface}" ] || return 1
rm -f "$1"
mv -f "$1"-pre."${interface}" "$1"
}
# 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 \
@SYSCONFDIR@/dhcpcd.enter-hook \
@HOOKDIR@/* \
@SYSCONFDIR@/dhcpcd.exit-hook
do
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
|
