一个解析cgi参数的shell脚本



  • #!/bin/sh
    #
    # Process input to a CGI script. Written and Copyright 1995 Frank Pilhofer
    # You may freely use and distribute this code free of charge provided that
    # this copyright notice remains.            fp@informatik.uni-frankfurt.de
    #
    # All variables in here are prefixed by _F_, so you shouldn't have
    # any conflicts with your own var names
    #
    # get query string. if $REQUEST_METHOD is "POST", then it must be read
    # from stdin, else it's in $QUERY_STRING
    #
    if [ ${DEBUG:-0} -eq 1 ] ; then
     echo --Program Starts-- 1>&2
    fi
    #
    if [ "$REQUEST_METHOD" = "POST" ] ; then
     _F_QUERY_STRING=`dd count=$CONTENT_LENGTH bs=1 2> /dev/null`"&"
     if [ "$QUERY_STRING" != "" ] ; then
      _F_QUERY_STRING="$_F_QUERY_STRING""$QUERY_STRING""&"
     fi
     if [ ${DEBUG:-0} -eq 1 ] ; then
      echo --Posted String-- 1>&2
     fi
    else
     _F_QUERY_STRING="$QUERY_STRING""&"
     if [ ${DEBUG:-0} -eq 1 ] ; then
      echo --Query String-- 1>&2
     fi
    fi
    if [ ${DEBUG:-0} -eq 1 ] ; then
     ( echo "  " $_F_QUERY_STRING
       echo --Adding Arguments-- ) 1>&2
    fi
    #
    # if there are arguments, use them as well.
    #
    for _F_PAR in $* ; do
     _F_QUERY_STRING="$_F_QUERY_STRING""$_F_PAR""&"
     if [ ${DEBUG:-0} -eq 1 ] ; then
      echo "  " arg $_F_PAR 1>&2
     fi
    done
    if [ ${DEBUG:-0} -eq 1 ] ; then
     ( echo --With Added Arguments--
       echo "  " $_F_QUERY_STRING ) 1>&2
    fi
    #
    # if $PATH_INFO is not empty and contains definitions '=', append it as well.
    # but replace slashes by ampersands
    #
    if echo $PATH_INFO | grep = > /dev/null ; then
     _F_PATH_INFO="$PATH_INFO""//"
     if [ ${DEBUG:-0} -eq 1 ] ; then
      ( echo --Adding Path Info--
        echo "  " $_F_PATH_INFO ) 1>&2
     fi
     while [ "$_F_PATH_INFO" != "" -a "$_F_PATH_INFO" != "/" ] ; do
      _F_QUERY_STRING="$_F_QUERY_STRING""`echo $_F_PATH_INFO | cut -d / -f 1`""&"
      _F_PATH_INFO=`echo $_F_PATH_INFO | cut -s -d / -f 2-`
     done
    fi
    #
    # append another '&' to fool some braindead cut implementations. Test yours:
    # echo 'i am braindead!' | cut -d '!' -f 2
    #
    _F_QUERY_STRING="$_F_QUERY_STRING""&"
    #
    if [ ${DEBUG:-0} -eq 1 ] ; then
     ( echo --Final Query String--
       echo "  " $_F_QUERY_STRING ) 1>&2
    fi
    #
    while [ "$_F_QUERY_STRING" != "" -a "$_F_QUERY_STRING" != "&" ] ; do
     _F_VARDEF=`echo $_F_QUERY_STRING | cut -d \& -f 1`
    # _F_QUERY_STRING=`echo $_F_QUERY_STRING | cut -d \& -f 2-`
     _F_VAR=`echo $_F_VARDEF | cut -d = -f 1`
     _F_VAL=`echo "$_F_VARDEF""=" | cut -d = -f 2`
    #
    # Workaround for more braindead cut implementations that strip delimiters
    # at the end of the line (i.e. HP-UX 10)
    #
     if echo $_F_QUERY_STRING | grep -c \& > /dev/null ; then
      _F_QUERY_STRING=`echo $_F_QUERY_STRING | cut -d \& -f 2-`
     else
      _F_QUERY_STRING=""
     fi
     if [ ${DEBUG:-0} -eq 1 ] ; then
      ( echo --Got Variable--
        echo "  " var=$_F_VAR
        echo "  " val=$_F_VAL
        echo "  " rem=$_F_QUERY_STRING ) 1>&2
     fi
     if [ "$_F_VAR" = "" ] ; then
      continue
     fi
    #
    # replace '+' by spaces
    #
     _F_VAL="$_F_VAL""++"
     _F_TMP=
     while [ "$_F_VAL" != "" -a "$_F_VAL" != "+" -a "$_F_VAL" != "++" ] ; do
      _F_TMP="$_F_TMP""`echo $_F_VAL | cut -d + -f 1`"
      _F_VAL=`echo $_F_VAL | cut -s -d + -f 2-`
      if [ "$_F_VAL" != "" -a "$_F_VAL" != "+" ] ; then
       _F_TMP="$_F_TMP"" "
      fi
     done
     if [ ${DEBUG:-0} -eq 1 ] ; then
      echo "  " vrs=$_F_TMP 1>&2
     fi
    #
    # replace '%XX' by ascii character. the hex sequence MUST BE uppercase
    #
     _F_TMP="$_F_TMP""%%"
     _F_VAL=
     while [ "$_F_TMP" != "" -a "$_F_TMP" != "%" ] ; do
      _F_VAL="$_F_VAL""`echo $_F_TMP | cut -d % -f 1`"
      _F_TMP=`echo $_F_TMP | cut -s -d % -f 2-`
      if [ "$_F_TMP" != "" -a "$_F_TMP" != "%" ] ; then
       if [ ${DEBUG:-0} -eq 1 ] ; then
        echo "  " got hex "%" $_F_TMP 1>&2
       fi
       _F_HEX=`echo $_F_TMP | cut -c 1-2 | tr "abcdef" "ABCDEF"`
       _F_TMP=`echo $_F_TMP | cut -c 3-`
    #
    # can't handle newlines anyway. replace by space
    #
    #   if [ "$_F_HEX" = "0A" ] ; then
    #    _F_HEX="20"
    #   fi
       _F_VAL="$_F_VAL""`/bin/echo '\0'\`echo "16i8o"$_F_HEX"p" | dc\``"
      fi
     done
    #
    # replace forward quotes to backward quotes, since we have trouble handling
    # the former ones.
    #
     _F_VAL=`echo $_F_VAL | tr "'" '\`'`
    #
    # if debug, send variables to stderr
    #
     if [ ${DEBUG:-0} -eq 1 ] ; then
      ( echo --Final Assignment--
        echo "FORM_$_F_VAR"=\'$_F_VAL\' ) 1>&2
     fi
    # /bin/echo "FORM_$_F_VAR"=\'$_F_VAL\'
     /bin/echo "FORM_$_F_VAR"="'"$_F_VAL"'"
    done
    #
    if [ ${DEBUG:-0} -eq 1 ] ; then
     echo done. 1>&2
    fi
    #
    # done.
    #
    exit 0