mirror of
https://github.com/rsmarples/dhcpcd.git
synced 2024-11-24 02:24:35 +08:00
343 lines
7.4 KiB
Bash
343 lines
7.4 KiB
Bash
#!/bin/sh
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# dhcpcd client configuration script
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# Handy variables and functions for our hooks to use
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case "$reason" in
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ROUTERADVERT)
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ifsuffix=":ra";;
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INFORM6|BOUND6|RENEW6|REBIND6|REBOOT6|EXPIRE6|RELEASE6|STOP6)
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ifsuffix=":dhcp6";;
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*)
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ifsuffix=;;
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esac
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ifname="$interface$ifsuffix"
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from=from
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signature_base="# Generated by dhcpcd"
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signature="$signature_base $from $ifname"
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signature_base_end="# End of dhcpcd"
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signature_end="$signature_base_end $from $ifname"
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state_dir=@RUNDIR@/dhcpcd
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_detected_init=false
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: ${if_up:=false}
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: ${if_down:=false}
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# Ensure that all arguments are unique
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uniqify()
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{
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local result= i=
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for i do
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case " $result " in
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*" $i "*);;
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*) result="$result $i";;
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esac
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done
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echo "${result# *}"
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}
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# List interface config files in a directory.
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# If dhcpcd is running as a single instance then it will have a list of
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# interfaces in the preferred order.
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# Otherwise we just use what we have.
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list_interfaces()
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{
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local i= x= ifaces=
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for i in $interface_order; do
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[ -e "$1/$i" ] && ifaces="$ifaces${ifaces:+ }$i"
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done
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for x in "$1"/*; do
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[ -e "$x" ] || continue
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for i in $interface_order; do
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if [ $i = "${x##*/}" ]; then
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unset x
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break
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fi
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done
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[ -n "$x" ] && ifaces="$ifaces${ifaces:+ }${x##*/}"
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done
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echo "$ifaces"
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}
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# Trim function
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trim()
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{
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local var="$*"
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var=${var#"${var%%[![:space:]]*}"}
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var=${var%"${var##*[![:space:]]}"}
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if [ -z "$var" ]; then
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# So it seems our shell doesn't support wctype(3) patterns
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# Fall back to sed
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var=$(echo "$*" | sed -e 's/^[[:space:]]*//;s/[[:space:]]*$//')
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fi
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printf %s "$var"
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}
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# We normally use sed to extract values using a key from a list of files
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# but sed may not always be available at the time.
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key_get_value()
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{
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local key="$1" value= x= line=
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shift
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if type sed >/dev/null 2>&1; then
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sed -n "s/^$key//p" $@
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else
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for x do
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while read line; do
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case "$line" in
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"$key"*) echo "${line##$key}";;
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esac
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done < "$x"
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done
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fi
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}
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# We normally use sed to remove markers from a configuration file
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# but sed may not always be available at the time.
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remove_markers()
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{
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local m1="$1" m2="$2" x= line= in_marker=0
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shift; shift
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if type sed >/dev/null 2>&1; then
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sed "/^$m1/,/^$m2/d" $@
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else
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for x do
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while read line; do
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case "$line" in
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"$m1"*) in_marker=1;;
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"$m2"*) in_marker=0;;
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*) [ $in_marker = 0 ] && echo "$line";;
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esac
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done < "$x"
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done
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fi
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}
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# Compare two files.
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# If different, replace first with second otherwise remove second.
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change_file()
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{
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if [ -e "$1" ]; then
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if type cmp >/dev/null 2>&1; then
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cmp -s "$1" "$2"
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elif type diff >/dev/null 2>&1; then
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diff -q "$1" "$2" >/dev/null
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else
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# Hopefully we're only working on small text files ...
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[ "$(cat "$1")" = "$(cat "$2")" ]
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fi
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if [ $? -eq 0 ]; then
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rm -f "$2"
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return 1
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fi
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fi
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cat "$2" > "$1"
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rm -f "$2"
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return 0
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}
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# Save a config file
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save_conf()
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{
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if [ -f "$1" ]; then
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rm -f "$1-pre.$interface"
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cat "$1" > "$1-pre.$interface"
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fi
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}
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# Restore a config file
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restore_conf()
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{
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[ -f "$1-pre.$interface" ] || return 1
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cat "$1-pre.$interface" > "$1"
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rm -f "$1-pre.$interface"
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}
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# Write a syslog entry
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syslog()
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{
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local lvl="$1"
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[ -n "$lvl" ] && shift
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if [ -n "$*" ]; then
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if type logger >/dev/null 2>&1; then
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logger -t dhcpcd -p daemon."$lvl" -is "$interface: $*"
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fi
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fi
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}
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# Check for a valid domain name as per RFC1123 with the exception of
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# allowing - and _ as they seem to be widely used.
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valid_domainname()
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{
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local name="$1" label
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[ -z "$name" -o ${#name} -gt 255 ] && return 1
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while [ -n "$name" ]; do
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label="${name%%.*}"
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[ -z "$label" -o ${#label} -gt 63 ] && return 1
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case "$label" in
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-*|_*|*-|*_) return 1;;
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*[![:alnum:]-_]*) return 1;;
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esac
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[ "$name" = "${name#*.}" ] && break
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name="${name#*.}"
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done
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return 0
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}
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valid_domainname_list()
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{
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local name
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for name do
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valid_domainname "$name" || return $?
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done
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return 0
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}
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# Check for a valid path
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valid_path()
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{
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case "$@" in
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*[![:alnum:]#%+-_:\.,@~\\/\[\]=\ ]*) return 1;;
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esac
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return 0
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}
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# With the advent of alternative init systems, it's possible to have
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# more than one installed. So we need to try and guess what one we're
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# using unless overriden by configure.
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detect_init()
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{
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_service_exists="@SERVICEEXISTS@"
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_service_cmd="@SERVICECMD@"
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_service_status="@SERVICESTATUS@"
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[ -n "$_service_cmd" ] && return 0
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if ${_detected_init}; then
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[ -n "$_service_cmd" ]
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return $?
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fi
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# Detect the running init system.
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# As systemd and OpenRC can be installed on top of legacy init
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# systems we try to detect them first.
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_service_status=
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if [ -x /bin/systemctl -a -S /run/systemd/private ]; then
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_service_exists="/bin/systemctl --quiet is-enabled \$1.service"
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_service_status="/bin/systemctl --quiet is-active \$1.service"
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_service_cmd="/bin/systemctl \$2 \$1.service"
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elif [ -x /usr/bin/systemctl -a -S /run/systemd/private ]; then
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_service_exists="/usr/bin/systemctl --quiet is-enabled \$1.service"
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_service_status="/usr/bin/systemctl --quiet is-active \$1.service"
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_service_cmd="/usr/bin/systemctl \$2 \$1.service"
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elif [ -x /sbin/rc-service -a \
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-s /libexec/rc/init.d/softlevel -o -s /run/openrc/softlevel ]
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then
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_service_exists="/sbin/rc-service -e \$1"
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_service_cmd="/sbin/rc-service \$1 -- -D \$2"
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elif [ -x /usr/sbin/invoke-rc.d ]; then
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_service_exists="/usr/sbin/invoke-rc.d --query --quiet \$1 start >/dev/null 2>&1 || [ \$? = 104 ]"
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_service_cmd="/usr/sbin/invoke-rc.d \$1 \$2"
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elif [ -x /sbin/service ]; then
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_service_exists="/sbin/service \$1 >/dev/null 2>&1"
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_service_cmd="/sbin/service \$1 \$2"
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elif [ -e /etc/slackware-version -a -d /etc/rc.d ]; then
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_service_exists="[ -x /etc/rc.d/rc.\$1 ]"
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_service_cmd="/etc/rc.d/rc.\$1 \$2"
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_service_status="/etc/rc.d/rc.\$1 status 1>/dev/null 2>&1"
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else
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for x in /etc/init.d/rc.d /etc/rc.d /etc/init.d; do
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if [ -d $x ]; then
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_service_exists="[ -x $x/\$1 ]"
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_service_cmd="$x/\$1 \$2"
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break
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fi
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done
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if [ -e /etc/arch-release ]; then
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_service_status="[ -e /var/run/daemons/\$1 ]"
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fi
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fi
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_detected_init=true
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if [ -z "$_service_cmd" ]; then
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syslog err "could not detect a useable init system"
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return 1
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fi
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return 0
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}
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# Check a system service exists
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service_exists()
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{
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if [ -z "$_service_exists" ]; then
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detect_init || return 1
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fi
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eval $_service_exists
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}
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# Send a command to a system service
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service_cmd()
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{
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if [ -z "$_service_cmd" ]; then
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detect_init || return 1
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fi
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eval $_service_cmd
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}
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# Send a command to a system service if it is running
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service_status()
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{
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if [ -z "$_service_cmd" ]; then
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detect_init || return 1
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fi
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if [ -n "$_service_status" ]; then
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eval $_service_status
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else
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service_command $1 status >/dev/null 2>&1
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fi
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}
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# Handy macros for our hooks
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service_command()
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{
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service_exists $1 && service_cmd $1 $2
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}
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service_condcommand()
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{
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service_exists $1 && service_status $1 && service_cmd $1 $2
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}
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# We source each script into this one so that scripts run earlier can
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# remove variables from the environment so later scripts don't see them.
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# Thus, the user can create their dhcpcd.enter/exit-hook script to configure
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# /etc/resolv.conf how they want and stop the system scripts ever updating it.
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for hook in \
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@SYSCONFDIR@/dhcpcd.enter-hook \
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@HOOKDIR@/* \
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@SYSCONFDIR@/dhcpcd.exit-hook
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do
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for skip in $skip_hooks; do
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case "$hook" in
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*/*~) continue 2;;
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*/"$skip") continue 2;;
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*/[0-9][0-9]"-$skip") continue 2;;
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*/[0-9][0-9]"-$skip.sh") continue 2;;
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esac
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done
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if [ -f "$hook" ]; then
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. "$hook"
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fi
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done
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