cgi/proccgi.sh

   1 #!/bin/sh
   2 #
   3 # Process input to a CGI script. Written and Copyright 1995 Frank Pilhofer
   4 # You may freely use and distribute this code free of charge provided that
   5 # this copyright notice remains.            fp@informatik.uni-frankfurt.de
   6 #
   7 # All variables in here are prefixed by _F_, so you shouldn't have
   8 # any conflicts with your own var names
   9 #
  10 # get query string. if $REQUEST_METHOD is "POST", then it must be read
  11 # from stdin, else it's in $QUERY_STRING
  12 #
  13
  14 if [ ${DEBUG:-0} -eq 1 ] ; then
  15         echo --Program Starts-- 1>&2
  16 fi
  17 #
  18 if [ "$REQUEST_METHOD" = "POST" ] ; then
  19         _F_QUERY_STRING=`dd count=$CONTENT_LENGTH bs=1 2> /dev/null`"&"
  20         if [ "$QUERY_STRING" != "" ] ; then
  21                 _F_QUERY_STRING="$_F_QUERY_STRING""$QUERY_STRING""&"
  22         fi
  23         if [ ${DEBUG:-0} -eq 1 ] ; then
  24                 echo --Posted String-- 1>&2
  25         fi
  26 else
  27         _F_QUERY_STRING="$QUERY_STRING""&"
  28         if [ ${DEBUG:-0} -eq 1 ] ; then
  29                 echo --Query String-- 1>&2
  30         fi
  31 fi
  32 if [ ${DEBUG:-0} -eq 1 ] ; then
  33         ( echo "  " $_F_QUERY_STRING
  34           echo --Adding Arguments-- ) 1>&2
  35 fi
  36 #
  37 # if there are arguments, use them as well.
  38 #
  39 for _F_PAR in $* ; do
  40         _F_QUERY_STRING="$_F_QUERY_STRING""$_F_PAR""&"
  41         if [ ${DEBUG:-0} -eq 1 ] ; then
  42                 echo "  " arg $_F_PAR 1>&2
  43         fi
  44 done
  45 if [ ${DEBUG:-0} -eq 1 ] ; then
  46         ( echo --With Added Arguments--
  47           echo "  " $_F_QUERY_STRING ) 1>&2
  48 fi
  49 #
  50 # if $PATH_INFO is not empty and contains definitions '=', append it as well.
  51 # but replace slashes by ampersands
  52 #
  53 if echo $PATH_INFO | grep = > /dev/null ; then
  54         _F_PATH_INFO="$PATH_INFO""//"
  55         if [ ${DEBUG:-0} -eq 1 ] ; then
  56                 ( echo --Adding Path Info--
  57                   echo "  " $_F_PATH_INFO ) 1>&2
  58         fi
  59
  60         while [ "$_F_PATH_INFO" != "" -a "$_F_PATH_INFO" != "/" ] ; do
  61                 _F_QUERY_STRING="$_F_QUERY_STRING""`echo $_F_PATH_INFO | cut -d / -f 1`""&"
  62                 _F_PATH_INFO=`echo $_F_PATH_INFO | cut -s -d / -f 2-`
  63         done
  64 fi
  65 #
  66 # append another '&' to fool some braindead cut implementations. Test yours:
  67 # echo 'i am braindead!' | cut -d '!' -f 2
  68 #
  69 _F_QUERY_STRING="$_F_QUERY_STRING""&"
  70 #
  71 if [ ${DEBUG:-0} -eq 1 ] ; then
  72         ( echo --Final Query String--
  73           echo "  " $_F_QUERY_STRING ) 1>&2
  74 fi
  75 #
  76 while [ "$_F_QUERY_STRING" != "" -a "$_F_QUERY_STRING" != "&" ] ; do
  77         _F_VARDEF=`echo $_F_QUERY_STRING | cut -d \& -f 1`
  78 #       _F_QUERY_STRING=`echo $_F_QUERY_STRING | cut -d \& -f 2-`
  79         _F_VAR=`echo $_F_VARDEF | cut -d = -f 1`
  80         _F_VAL=`echo "$_F_VARDEF""=" | cut -d = -f 2`
  81
  82 #
  83 # Workaround for more braindead cut implementations that strip delimiters
  84 # at the end of the line (i.e. HP-UX 10)
  85 #
  86
  87         if echo $_F_QUERY_STRING | grep -c \& > /dev/null ; then
  88                 _F_QUERY_STRING=`echo $_F_QUERY_STRING | cut -d \& -f 2-`
  89         else
  90                 _F_QUERY_STRING=""
  91         fi
  92
  93         if [ ${DEBUG:-0} -eq 1 ] ; then
  94                 ( echo --Got Variable--
  95                   echo "  " var=$_F_VAR
  96                   echo "  " val=$_F_VAL
  97                   echo "  " rem=$_F_QUERY_STRING ) 1>&2
  98         fi
  99         if [ "$_F_VAR" = "" ] ; then
 100                 continue
 101         fi
 102
 103 #
 104 # replace '+' by spaces
 105 #
 106
 107         _F_VAL="$_F_VAL""++"
 108         _F_TMP=
 109
 110         while [ "$_F_VAL" != "" -a "$_F_VAL" != "+" -a "$_F_VAL" != "++" ] ; do
 111                 _F_TMP="$_F_TMP""`echo $_F_VAL | cut -d + -f 1`"
 112                 _F_VAL=`echo $_F_VAL | cut -s -d + -f 2-`
 113
 114                 if [ "$_F_VAL" != "" -a "$_F_VAL" != "+" ] ; then
 115                         _F_TMP="$_F_TMP"" "
 116                 fi
 117         done
 118
 119         if [ ${DEBUG:-0} -eq 1 ] ; then
 120                 echo "  " vrs=$_F_TMP 1>&2
 121         fi
 122
 123 #
 124 # replace '%XX' by ascii character. the hex sequence MUST BE uppercase
 125 #
 126
 127         _F_TMP="$_F_TMP""%%"
 128         _F_VAL=
 129
 130         while [ "$_F_TMP" != "" -a "$_F_TMP" != "%" ] ; do
 131                 _F_VAL="$_F_VAL""`echo $_F_TMP | cut -d % -f 1`"
 132                 _F_TMP=`echo $_F_TMP | cut -s -d % -f 2-`
 133
 134                 if [ "$_F_TMP" != "" -a "$_F_TMP" != "%" ] ; then
 135                         if [ ${DEBUG:-0} -eq 1 ] ; then
 136                                 echo "  " got hex "%" $_F_TMP 1>&2
 137                         fi
 138                         _F_HEX=`echo $_F_TMP | cut -c 1-2 | tr "abcdef" "ABCDEF"`
 139                         _F_TMP=`echo $_F_TMP | cut -c 3-`
 140 #
 141 # can't handle newlines anyway. replace by space
 142 #
 143 #                       if [ "$_F_HEX" = "0A" ] ; then
 144 #                               _F_HEX="20"
 145 #                       fi
 146
 147                         _F_VAL="$_F_VAL""`/bin/echo '\0'\`echo "16i8o"$_F_HEX"p" | dc\``"
 148                 fi
 149         done
 150
 151 #
 152 # replace forward quotes to backward quotes, since we have trouble handling
 153 # the former ones.
 154 #
 155
 156         _F_VAL=`echo $_F_VAL | tr "'" '\`'`
 157
 158 #
 159 # if debug, send variables to stderr
 160 #
 161
 162         if [ ${DEBUG:-0} -eq 1 ] ; then
 163                 ( echo --Final Assignment--
 164                   echo "F1_$_F_VAR"=\'$_F_VAL\' ) 1>&2
 165         fi
 166
 167 #       /bin/echo "FORM_$_F_VAR"=\'$_F_VAL\'
 168 #       /bin/echo "F2_$_F_VAR"="'"$_F_VAL"'"
 169         export "F_"$_F_VAR=`echo -e "$_F_VAL"`
 170
 171 done
 172 #
 173 if [ ${DEBUG:-0} -eq 1 ] ; then
 174         echo done. 1>&2
 175 fi
 176 #
 177 # done.
 178 #
 179 #exit 0
 180