applets/busybox.mksuid

   1 #!/bin/sh
   2 # Make list of configuration variables regarding suid handling
   3
   4 # input $1: full path to autoconf.h
   5 # input $2: full path to applets.h
   6 # input $3: full path to .config
   7 # output (stdout): list of CONFIG_ that do or may require suid
   8
   9 # If the environment variable SUID is not set or set to DROP,
  10 # lists all config options that do not require suid permissions.
  11 # Otherwise, lists all config options for applets that DO or MAY require
  12 # suid permissions.
  13
  14 # Maintainer: Bernhard Reutner-Fischer
  15
  16 export LC_ALL=POSIX
  17 export LC_CTYPE=POSIX
  18
  19 CONFIG_H=${1:-include/autoconf.h}
  20 APPLETS_H=${2:-include/applets.h}
  21 DOT_CONFIG=${3:-.config}
  22
  23 case ${SUID:-DROP} in
  24 [dD][rR][oO][pP]) USE="DROP" ;;
  25 *) USE="suid" ;;
  26 esac
  27
  28 $HOSTCC -E -DMAKE_SUID -include $CONFIG_H $APPLETS_H |
  29   awk -v USE=${USE} '
  30     /^SUID[ \t]/{
  31       if (USE == "DROP") {
  32         if ($2 != "BB_SUID_DROP") next
  33       } else {
  34         if ($2 == "BB_SUID_DROP") next
  35       }
  36       cfg = $NF
  37       gsub("\"", "", cfg)
  38       cfg = substr(cfg, 8)
  39       s[i++] = "CONFIG_" cfg
  40       s[i++] = "CONFIG_FEATURE_" cfg "_.*"
  41     }
  42     END{
  43       while (getline < ARGV[2]) {
  44         for (j in s) {
  45           if ($0 ~ "^" s[j] "=y$") {
  46             sub(/=.*/, "")
  47             print
  48             if (s[j] !~ /\*$/) delete s[j] # can drop this applet now
  49           }
  50         }
  51       }
  52     }
  53 ' - $DOT_CONFIG
  54