LXR busybox/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 $3: full path to .config
   7# output (stdout): list of CONFIG_ that do or may require suid
   8
   9# If the environment variable SUID is not set or set to DROP,
  10# lists all config options that do not require suid permissions.
  11# Otherwise, lists all config options for applets that DO or MAY require
  12# suid permissions.
  13
  14# Maintainer: Bernhard Reutner-Fischer
  15
  16export LC_ALL=POSIX
  17export LC_CTYPE=POSIX
  18
  19CONFIG_H=${1:-include/autoconf.h}
  20APPLETS_H=${2:-include/applets.h}
  21DOT_CONFIG=${3:-.config}
  22
  23case ${SUID:-DROP} in
  24[dD][rR][oO][pP]) USE="DROP" ;;
  25*) USE="suid" ;;
  26esac
  27
  28$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
  55