用shell构造CGI脚本 - nicebug/nicebug.github.io GitHub Wiki

利用shell构造cgi脚本

#!/bin/sh

eval `./proccgi.sh $*`
echo "Content-type:text/html;charset=UTF-8"
echo ""

task_id="${FORM_taskid}"
print ${task_id}

前台将taskid=XXXX，传给CGI程序。CGI中调用了proccgi.sh脚本，将taskid的值解析出来存放到变量FORM_taskid中。这样，就已经拿到taskid的值了。接下来print task_id，是将task_id的值输出到标准输出，到此CGI程序就全部结束了，CGI会将print到标准输出的内容全部当作http的response，返回给浏览器。

proccgi.sh

#!/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.            [email protected]
#
# 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_VAL=$_F_TMP


#
# 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