external/bsd/dhcpcd/dist/dhcpcd-run-hooks.in

   1 #!/bin/sh
   2 # dhcpcd client configuration script
   3
   4 # Handy variables and functions for our hooks to use
   5 from=from
   6 signature_base="# Generated by dhcpcd"
   7 signature="$signature_base $from $interface"
   8 signature_base_end="# End of dhcpcd"
   9 signature_end="$signature_base_end $from $interface"
  10 state_dir=/var/run/dhcpcd
  11
  12 # Ensure that all arguments are unique
  13 uniqify()
  14 {
  15         local result= i=
  16         for i; do
  17                 case " $result " in
  18                         *" $i "*);;
  19                         *) result="$result $i";;
  20                 esac
  21         done
  22         echo "${result# *}"
  23 }
  24
  25 # List interface config files in a dir
  26 # If dhcpcd is running as a single instance then it will have a list of
  27 # interfaces in the preferred order.
  28 # Otherwise we just use what we have.
  29 list_interfaces()
  30 {
  31         local i= x= ifaces=
  32         for i in $interface_order; do
  33                 [ -e "$1/$i" ] && ifaces="$ifaces${ifaces:+ }$i"
  34         done
  35         for x in "$1"/*; do
  36                 [ -e "$x" ] || continue
  37                 for i in $interface_order; do
  38                         if [ $i = "${x##*/}" ]; then
  39                                 unset x
  40                                 break
  41                         fi
  42                 done
  43                 [ -n "$x" ] && ifaces="$ifaces${ifaces:+ }${x##*/}"
  44         done
  45         echo "$ifaces"
  46 }
  47
  48 # We normally use sed to extract values using a key from a list of files
  49 # but sed may not always be available at the time.
  50 key_get_value()
  51 {
  52         local key="$1" value= x= line=
  53
  54         shift
  55         if type sed >/dev/null 2>&1; then
  56                 sed -n "s/^$key//p" $@
  57         else
  58                 for x; do
  59                         while read line; do
  60                                 case "$line" in
  61                                 "$key"*) echo "${line##$key}";;
  62                                 esac
  63                         done < "$x"
  64                 done
  65         fi
  66 }
  67
  68 # We normally use sed to remove markers from a configuration file
  69 # but sed may not always be available at the time.
  70 remove_markers()
  71 {
  72         local m1="$1" m2="$2" x= line= in_marker=0
  73
  74         shift; shift
  75         if type sed >/dev/null 2>&1; then
  76                 sed "/^$m1/,/^$m2/d" $@
  77         else
  78                 for x; do
  79                         while read line; do
  80                                 case "$line" in
  81                                 "$m1"*) in_marker=1;;
  82                                 "$m2"*) in_marker=0;;
  83                                 *) [ $in_marker = 0 ] && echo "$line";;
  84                                 esac
  85                         done < "$x"
  86                 done
  87         fi
  88 }
  89
  90 # Compare two files
  91 # If different, replace first with second otherwise remove second
  92 change_file()
  93 {
  94         if type cmp >/dev/null 2>&1; then
  95                 cmp -s "$1" "$2"
  96         elif type diff >/dev/null 2>&1; then
  97                 diff -q "$1" "$2" >/dev/null
  98         else
  99                 # Hopefully we're only working on small text files ...
 100                 [ "$(cat "$1")" = "$(cat "$2")" ]
 101         fi
 102         if [ $? -eq 0 ]; then
 103                 rm -f "$2"
 104                 return 1
 105         fi
 106         cat "$2" > "$1"
 107         rm -f "$2"
 108         return 0
 109 }
 110
 111 # Save a config file
 112 save_conf()
 113 {
 114         if [ -f "$1" ]; then
 115                 rm -f "$1-pre.$interface"
 116                 cat "$1" > "$1-pre.$interface"
 117         fi
 118 }
 119
 120 # Restore a config file
 121 restore_conf()
 122 {
 123         [ -f "$1-pre.$interface" ] || return 1
 124         cat "$1-pre.$interface" > "$1"
 125         rm -f "$1-pre.$interface"
 126 }
 127
 128 # Write a syslog entry
 129 syslog()
 130 {
 131         local lvl="$1"
 132
 133         [ -n "$lvl" ] && shift
 134         if [ -n "$@" ]; then
 135                 if type logger >/dev/null 2>&1; then
 136                         logger -t dhcpcd -p daemon."$lvl" -s "$@"
 137                 fi
 138         fi
 139 }
 140
 141
 142 # We source each script into this one so that scripts run earlier can
 143 # remove variables from the environment so later scripts don't see them.
 144 # Thus, the user can create their dhcpcd.enter/exit-hook script to configure
 145 # /etc/resolv.conf how they want and stop the system scripts ever updating it.
 146 for hook in \
 147         @SYSCONFDIR@/dhcpcd.enter-hook \
 148         @HOOKDIR@/* \
 149         @SYSCONFDIR@/dhcpcd.exit-hook
 150 do
 151         for skip in $skip_hooks; do
 152                 case "$hook" in
 153                         */"$skip")                      continue 2;;
 154                         */[0-9][0-9]"-$skip")           continue 2;;
 155                         */[0-9][0-9]"-$skip.sh")        continue 2;;
 156                 esac
 157         done
 158         if [ -f "$hook" ]; then
 159                 . "$hook"
 160         fi
 161 done