1. BusyBox httpd CGI scripts
The http daemon expects that CGI script is in subdirectory cgi-bin under main web directory set by options -h (default /www and CGI in /www/cgi-bin). CGI script must have permision for execute (min mode 700).
1.1. CGI
Standard set of Comon Gateway Interface environment variable are :
CONTENT_TYPE=application/x-www-form-urlencoded GATEWAY_INTERFACE=CGI/1.1 REMOTE_ADDR=192.168.1.180 QUERY_STRING=Zbr=1234567&SrceMB=&ime=jhkjhlkh+klhlkjhlk+%A9%D0%C6%AE%C6%AE&prezime=&sektor=OP REMOTE_PORT=2292 CONTENT_LENGTH=128 REQUEST_URI=/cgi-bin/test SERVER_SOFTWARE=busybox httpd/1.35 6-Oct-2004 PATH=/bin:/sbin:/usr/bin:/usr/sbin HTTP_REFERER= SERVER_PROTOCOL=HTTP/1.0 PATH_INFO= REQUEST_METHOD=POST PWD=/www/cgi-bin SERVER_PORT=80 SCRIPT_NAME=/cgi-bin/test REMOTE_USER=[http basic auth username]
/cgi-bin/test
#!/bin/sh echo "Content-type: text/html" echo "" echo "Sample CGI Output " echo "" echo "" env echo "" echo " "
Environment variables are set up and the script is invoked with pipes for stdin/stdout.
1.2. HTML Forms
If a post is being done the script is fed the POST data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
Prefered way to do forms in CGI is POST.
1.2.1. POST
Example how to use POST in form.
/www/form-post.html
CGI Test
/www/cgi-bin/test-post
#!/bin/sh echo "Content-type: text/html" echo "" echo "Sample CGI Output " echo "" echo "" echo "Environment variables" echo "" env echo "" echo "=========================================================" echo "" echo "Form variables :" echo "" read QUERY_STRING eval $(echo "$QUERY_STRING"|awk -F'&' '{for(i=1;i<=NF;i++){print $i}}') tmp=`httpd -d $Text_Field` echo "Text_Field=$tmp" tmp=`httpd -d $Radio_Button` echo "Radio_Button=$tmp" tmp=`httpd -d $Text_Area` echo "Text_Area=$tmp" echo "" echo ""
1.2.2. GET
Text area fields (and any other field that may contain \n are very hard to menage).
Example how to use GET in form.
/www/form-get.html
CGI Test
/www/cgi-bin/test-get
#!/bin/sh echo "Content-type: text/html" echo "" echo "Sample CGI Output " echo "" echo "" echo "Environment variables" echo "" env echo "" echo "=========================================================" echo "" echo "Form variables :" echo "" eval $(echo "$QUERY_STRING"|awk -F'&' '{for(i=1;i<=NF;i++){print $i}}') tmp=`httpd -d $Text_Field` echo "Text_Field=$tmp" tmp=`httpd -d $Radio_Button` echo "Radio_Button=$tmp" echo "" echo ""
) button at the top of the page.