#!/usr/bin/dash

#
# Copyright (c) 2009,2011 Charles Wilson
# Based on rebaseall by Jason Tishler
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# See the COPYING file for full license information.

# Define constants
tp1=${0%/*}
tp2=${tp1:-.}
PATH=$(cd $tp2 && pwd):/usr/bin:/bin

ProgramName=${0##*/}
ProgramOptions='p:d:t:s:T:knvh'
DefaultExtraArgs=
DefaultTSAware=1
DefaultDynBase=0
DefaultKeep=
DefaultDoNothing=
DefaultVerbose=
DefaultFileList=
DefaultSuffixes='exe|dll|so|oct'

# Define functions
usage_string="usage: $ProgramName [-p extra_args] [-d bool] [-t bool] [-s suffix] [-T FileList | -] [-vnh]"
short_usage ()
{
    echo "$usage_string" 1>&2
    exit 1
}

long_help ()
{
    echo "$usage_string"
    echo "When invoked with no arguments, $ProgramName modifies every cygwin $DefaultSuffixes"
    echo "on the system: .exe files have their tsaware flag set, while .dll, .so and .oct"
    echo "files have their dynamicbase flag removed. However, if any of [-d|-t|-s] are"
    echo "specified then ONLY the actions so specified will occur."
    echo "   -p extra_args   pass extra_args to peflags.exe"  
    echo "   -d bool         set the dynamicbase flag to 'bool' on all specified files"
    echo "   -t bool         set the tsaware flag to 'bool' on all specified files"
    echo "   -s suffix       search for all files with the specified suffix(es)"
    echo "                     default: 'exe|dll|so|oct'"
    echo "   -T FileList     in addition to files located via the normal search and"
    echo "                   suffix list, also operate on files listed in FileList"
    echo "                   May be '-' which indicates stdin"
    echo "   -n              do not modify any files, but display the peflags commands"
    echo "   -k              keep all temporary files"
    echo "   -v              verbose mode"
    echo "   -h              show this help"
    echo "bool may be '0', '1', 'true', 'false', 'yes', or 'no'"
    echo "Note: peflagsall will NOT set the dynamicbase flag on executables, nor will"
    echo "      it set the tsaware flag on dlls. If you must do this, use peflags itself"
    exit 0
}

check_args_for_help()
{
    # we do this early, so that we can print help before
    # the process-check.
    for a in "$@"
    do
        case "$a" in
        "--help"|"-help"|"-h") long_help ;;
        esac
    done
}

to_bool_result=
to_bool()
{
    case "$1" in
    [Tt][Rr][Uu][Ee]     ) to_bool_result=1;;
    [Ff][Aa][Ll][Ss][Ee] ) to_bool_result=0;;
    [Yy][Ee][Ss]         ) to_bool_result=1;;
    [Nn][Oo]             ) to_bool_result=0;;
    [Yy]                 ) to_bool_result=1;;
    [Nn]                 ) to_bool_result=0;;
    1|0                  ) to_bool_result=$1;;
    *) echo "Bad bool argument '$1'" 1>&2
       short_usage
       exit 1
    esac
}

cleanup()
{
    if test -z "$Keep"
    then
    	rm -f "$TmpFile" "$ExeFile" "$DllFile"
    else
        echo "Saving temp files '$TmpDir/peflags_*' (may not exist)" 1>&2
    fi
    exit $ExitCode
}

verbose_only()
{
    if test -n "$Verbose"
    then
        echo "$@" 1>&2
    fi
}

# Set traps
trap cleanup 1 2 15

# Set defaults
ExtraArgs=$DefaultExtraArgs
TSAware=$DefaultTSAware
DynBase=$DefaultDynBase
Keep=$DefaultKeep
DoNothing=$DefaultDoNothing
Verbose=$DefaultVerbose
FileList=$DefaultFileList
Suffixes=$DefaultSuffixes

# Argument accumulators
ArgSuffixes=
ArgTSAware=
ArgDynBase=

# First see if caller requested help
check_args_for_help "$@"

# Determine platform
Platform=`uname -s`
case $Platform in
 *MINGW*  | *mingw*  ) Platform=mingw  ;;
 *CYGWIN* | *cygwin* ) Platform=cygwin ;;
 *MSYS*   | *msys*   ) Platform=msys   ;;
 * )
    echo "Unsupported platform: $Platform" 1>&2
    exit 1
    ;;
esac

# Verify only ash or dash processes are running
ProcessResult=0
case $Platform in
  mingw|msys )
    /usr/bin/ps -s | /usr/bin/gawk '\
      # Count number of running ash or dash. \
      /\/usr\/bin\/(d)?ash(\.exe)?$/{ ash_cnt++; } \
      # Count number of ps and gawk. \
      /\/usr\/bin\/ps(\.exe)?$/{ cnt++; } \
      /\/usr\/bin\/gawk(\.exe)?$/{ cnt++; } \
      END{ \
        # Uncomment for testing: \
        # printf "TOTAL: %d CNT: %d ASH_CNT: %d\n", NR, cnt, ash_cnt; \
        # Only one of ps and gawk each may run. \
        if (cnt > 2) \
          exit 0; \
        # The total number of allowed processes is one less than the \
        # number of input lines.  The extra line is the ps header output. \
        if (NR - cnt - ash_cnt > 1) \
          exit 0; \
        # All is well. \
        exit 1; \
      }'
    ProcessResult=$?
    ;;
  cygwin )
    grep -E -q -i -v '/d?ash(.exe)?$' /proc/[0-9]*/exename
    ProcessResult=$?
    ;;
esac
if [ $ProcessResult -eq 0 -a -z "$RebaseDebug" ]
then
    echo "$ProgramName: only ash or dash processes are allowed during this process."
    echo "    Exit all Cygwin processes and stop all Cygwin services."
    echo "    Execute ash (or dash) from Start/Run... or a cmd or command window."
    echo "    Execute '/usr/bin/peflagsall' from ash (or dash)."
    exit 2
fi

# Parse command line arguments
while getopts $ProgramOptions Option "$@"
do
    case $Option in
    p)  ExtraArgs="$OPTARG";;
    d)  to_bool "$OPTARG"; ArgDynBase=$to_bool_result;;
    t)  to_bool "$OPTARG"; ArgTSAware=$to_bool_result;;
    s)
	if test -z "$ArgSuffixes"
        then
		ArgSuffixes="$OPTARG"
	else
		ArgSuffixes="$ArgSuffixes|$OPTARG"
	fi
	;;
    n)  DoNothing=:;;
    k)  Keep=1;;
    T)  FileList="$OPTARG";;
    v)  Verbose=-v;;
    h)  long_help;;
    \?) short_usage;;
    esac
done

# Evaluate command line arguments
if test -n "$ArgSuffixes" || test -n "$ArgDynBase" || test -n "$ArgTSAware"
then
    echo "Using custom arguments; all default behavior suppressed" 1>&2
    Suffixes="$ArgSuffixes"
    DynBase="$ArgDynBase"
    TSAware="$ArgTSAware"
fi
if test -z "$Suffixes"
then
    echo "Error: must specify suffixes (-s) when default behavior is suppressed" 1>&2
    short_usage
fi


# Set temp directory
TmpDir="${TMP:-${TEMP:-/tmp}}"

# Validate temp directory
if [ ! -d "$TmpDir" ]
then
    echo "$ProgramName: '$TmpDir' is not a directory" 1>&2
    exit 2
fi
if [ ! -w "$TmpDir" ]
then
    echo "$ProgramName: '$TmpDir' is not writable" 1>&2
    exit 2
fi

# Validate user supplied file list, if necessary
if [ -n "$FileList" -a ! -r "$FileList" -a "$FileList" != - ]
then
    echo "$ProgramName: '$FileList' is not readable" 1>&2
    exit 2
fi

# Set temp files
TmpFile="$TmpDir/peflags.lst"
ExeFile="$TmpDir/peflags_exe.lst"
DllFile="$TmpDir/peflags_dll.lst"

# Create file list
case $Platform in
  cygwin)
    find /etc/setup -name '*.lst.gz' | xargs gzip -d -c |
      grep -E "\.($Suffixes)\$" |
      sed -e '/cygwin1\.dll$/d' -e '/cyglsa.*\.dll$/d' \
          -e '/sys-root\/mingw/d' -e 's/^/\//' \
          -e '/d?ash\.exe$/d' -e '/peflags\.exe$/d' >"${TmpFile}"
    ;;
  msys)
    for f in /usr/bin /usr/lib
    do
      find $f -type f |
        grep -E "\.($Suffixes)\$" |
        sed -e '/msys-2\.0.*\.dll$/d' -e '/cygwin1\.dll$/d' \
            -e '/cyglsa.*\.dll$/d' -e '/d?ash\.exe$/d' \
            -e '/peflags\.exe$/d' >>"$TmpFile"
    done
    ;;
  mingw) ;; # no automatic files; only command line
esac

# Append user supplied file list, if any
if [ -n "$FileList" ]
then
    cat "$FileList" >>"$TmpFile"
fi

# Split file list into two groups: exe's, and everything else
# (presumably, DLLs by any name).
sed -n -e '/\.[Ee][Xx][Ee]$/p' < "$TmpFile" > "$ExeFile"
sed    -e '/\.[Ee][Xx][Ee]$/d' < "$TmpFile" > "$DllFile"
NumExes=`cat "$ExeFile" | sed -n '$='`
NumDlls=`cat "$DllFile" | sed -n '$='`

# Prepare to do exes
DoExes=
TSAwareCmd="--tsaware=$TSAware"
if test -n "$NumExes" && test "$NumExes" -gt 0
then
    if test -n "$TSAware" || test -n "$ExtraArgs"
    then
       DoExes=1
       if test -z "$TSAware"
       then
           TSAwareCmd=
       fi
    else
       verbose_only "Not processing $NumExes executables; neither -t nor -p specified"
    fi
else
    verbose_only "No executable files to process"
fi

# Prepare to do dlls
DoDlls=
DynBaseCmd="--dynamicbase=$DynBase"
if test -n "$NumDlls" && test "$NumDlls" -gt 0
then
    if test -n "$DynBase" || test -n "$ExtraArgs"
    then
       DoDlls=1
       if test -z "$DynBase"
       then
           DynBaseCmd=
       fi
    else
       verbose_only "Not processing $NumDlls dlls; neither -d nor -p specified"
    fi
else
    verbose_only "No dlls to process"
fi

if test -n "$DoExes"
then
    if test -n "$DoNothing" || test -n "$Verbose"
    then
        echo "peflags $Verbose $ExtraArgs $TSAwareCmd -T $ExeFile" 1>&2
    fi
    $DoNothing peflags $Verbose $ExtraArgs $TSAwareCmd -T "$ExeFile"
fi
ExitCode=$?

if test "$ExitCode" -eq 0
    then
    if test -n "$DoDlls" ; then
        if test -n "$DoNothing" || test -n "$Verbose"
        then
            echo "peflags $Verbose $ExtraArgs $DynBaseCmd -T $DllFile" 1>&2
        fi
        $DoNothing peflags $Verbose $ExtraArgs $DynBaseCmd -T "$DllFile"
    fi
    ExitCode=$?
fi

# Clean up
cleanup