Cgi won't run when there's no internet

For Developers
1

I am doing a web redirect by creating a redirect cgi using a lighttpd server.
Once your internet network is connected, connect wifi and it will run index.cgi and redirect you to the page you want.

However, if you're connected to Wi-Fi and still can't use the Internet, the connection isn't the only redirect page.

< lighttpd.conf >

# lighttpd configuration file
# 
## modules to load
# all other module should only be loaded if really neccesary
# - saves some time
# - saves memory
server.modules = ( 
    "mod_rewrite", 
#    "mod_redirect", 
    "mod_alias", 
    "mod_auth", 
    "mod_status", 
#    "mod_setenv",
#    "mod_fastcgi",
#    "mod_proxy",
#    "mod_simple_vhost",
    "mod_cgi",
    "mod_ssi",
#    "mod_usertrack",
#    "mod_expire",
    "mod_webdav" 
)

# force use of the "write" backend (closes: #2401)
server.network-backend = "write" 

## a static document-root, for virtual-hosting take look at the 
## server.virtual-* options
server.document-root = "/etc/MAP7000_Web/www/" 

## where to send error-messages to
#server.errorlog = "/var/log/lighttpd/error.log" 

## files to check for if .../ is requested
index-file.names = ( "index.shtml", "default.html", "index.htm", "default.htm","cgi-bin/index.cgi" )

## mimetype mapping
mimetype.assign = (  
    ".pdf"   => "application/pdf",
    ".class" => "application/octet-stream",
    ".pac"   => "application/x-ns-proxy-autoconfig",
    ".swf"   => "application/x-shockwave-flash",
    ".wav"   => "audio/x-wav",
    ".gif"   => "image/gif",
    ".jpg"   => "image/jpeg",
    ".jpeg"  => "image/jpeg",
    ".png"   => "image/png",
    ".svg"   => "image/svg+xml",
    ".css"   => "text/css",
    ".html"  => "text/html",
    ".htm"   => "text/html",
    ".js"    => "text/javascript",
    ".txt"   => "text/plain",
    ".dtd"   => "text/xml",
    ".xml"   => "text/xml" 
 )

## Use the "Content-Type" extended attribute to obtain mime type if possible
#mimetypes.use-xattr = "enable" 

## send a different Server: header
## be nice and keep it at lighttpd
#server.tag = "lighttpd" 

$HTTP["url"] =~ "\.pdf$" {
    server.range-requests = "disable" 
}

##
# which extensions should not be handle via static-file transfer
#
# .php, .pl, .fcgi are most often handled by mod_fastcgi or mod_cgi
static-file.exclude-extensions = ( ".php", ".pl", ".fcgi" )

######### Options that are good to be but not neccesary to be changed #######

## bind to port (default: 80)
#server.port = 81

## bind to localhost (default: all interfaces)
#server.bind = "localhost" 

## error-handler for status 404
server.error-handler-404 = "/cgi-bin/index.cgi" 
#server.error-handler-404 = "/error-handler.php" 

## to help the rc.scripts
server.pid-file = "/var/run/lighttpd.pid" 

###### virtual hosts
##
##   If you want name-based virtual hosting add the next three settings and load
##   mod_simple_vhost
##
## document-root =
##   virtual-server-root + virtual-server-default-host + virtual-server-docroot or
##   virtual-server-root + http-host + virtual-server-docroot
##
#simple-vhost.server-root = "/home/weigon/wwwroot/servers/" 
#simple-vhost.default-host = "grisu.home.kneschke.de" 
#simple-vhost.document-root = "/pages/" 

## 
## Format: <errorfile-prefix><status>.html
## -> ..../status-404.html for 'File not found'
#server.errorfile-prefix = "/www/error-" 

## virtual directory listings
#server.dir-listing = "enable" 

## send unhandled HTTP-header headers to error-log
#debug.dump-unknown-headers = "enable" 

### only root can use these options
#
# chroot() to directory (default: no chroot() )
#server.chroot = "/" 

## change uid to <uid> (default: don't care)
#server.username = "nobody" 
#
server.upload-dirs = ( "/tmp" )

## change uid to <uid> (default: don't care)
#server.groupname = "nobody" 

#### compress module
#compress.cache-dir          = "/dev/null/" 
#compress.filetype           = ("text/plain", "text/html")

#### proxy module
## read proxy.txt for more info
#proxy.server = (
#    ".php" => (
#        "localhost" => (
#            "host" => "192.168.0.101",
#            "port" => 80
#        )
#    )
#)

#### fastcgi module
## read fastcgi.txt for more info
#fastcgi.server = (
#    ".php" => (
#        "localhost" => (
#            "socket" => "/tmp/php-fastcgi.socket",
#            "bin-path" => "/usr/local/bin/php" 
#        )
#    )
#)

#### CGI module
cgi.assign = ( ".pl"  => "/usr/bin/perl", ".cgi" => "", ".sh" => "" )

#### SSL engine
#ssl.engine = "enable" 
#ssl.pemfile = "server.pem" 

#### status module
#status.status-url = "/server-status" 
#status.config-url = "/server-config" 

#### auth module
## read authentification.txt for more info
#auth.backend = "plain" 
#auth.backend.plain.userfile = "lighttpd.user" 
#auth.backend.plain.groupfile = "lighttpd.group" 
#auth.require = (
#    "/server-status" => ( 
#        "method"  => "digest",
#        "realm"   => "download archiv",
#        "require" => "group=www|user=jan|host=192.168.2.10" 
#    ),
#    "/server-info" => ( 
#        "method"  => "digest",
#        "realm"   => "download archiv",
#        "require" => "group=www|user=jan|host=192.168.2.10" 
#    )
#)

#### url handling modules (rewrite, redirect, access)
#url.rewrite = ( "^/$" => "/server-status" )
#url.redirect = ( "^/wishlist/(.+)" => "http://www.123.org/$1" )

#### both rewrite/redirect support back reference to regex conditional using %n
#$HTTP["host"] =~ "^www\.(.*)" {
#    url.redirect = ( "^/(.*)" => "http://%1/$1" )
#}

#### expire module
#expire.url = ( "/buggy/" => "access 2 hours", "/asdhas/" => "access plus 1 seconds 2 minutes")

#### ssi
ssi.extension = ( ".shtml" )

#### setenv
#setenv.add-request-header  = ( "TRAV_ENV" => "mysql://user@host/db" )
#setenv.add-response-header = ( "X-Secret-Message" => "42" )

#### variable usage:
## variable name without "." is auto prefixed by "var." and becomes "var.bar" 
#bar = 1
#var.mystring = "foo" 

## integer add
#bar += 1
## string concat, with integer cast as string, result: "www.foo1.com" 
#server.name = "www." + mystring + var.bar + ".com" 
## array merge
#index-file.names = (foo + ".php") + index-file.names
#index-file.names += (foo + ".php")

#### include
#include /etc/lighttpd/lighttpd-inc.conf
## same as above if you run: "lighttpd -f /etc/lighttpd/lighttpd.conf" 
#include "lighttpd-inc.conf" 

#### include_shell
#include_shell "echo var.a=1" 
## the above is same as:
#var.a=1

#### webdav
#$HTTP["url"] =~ "^/webdav($|/)" {
webdav.activate = "enable" 
webdav.is-readonly = "disable" 
# webdav.sqlite-db-name = "/var/run/lighttpd-webdav-lock.db" 
#}

< index.cgi >

int main(void) {
    unsigned char my_ip[4];
    char temp[64];
    char cmd[256];
    char test[256];
    int k;
    FILE *fp;

    //k=get_IP_from_system(my_ip,1);
    //sprintf(temp, "%d.%d.%d.%d", my_ip[0],my_ip[1],my_ip[2],my_ip[3]);    
//        printf("Status: 302 Moved\r\n");
//        printf("Cache-control: no-store\r\n");
//        printf("Connection: close\r\n");
    //if(k!=0)
    //{
        printf("Location: %s\r\n\r\n", "http://192.168.1.254/main2.html");
    //}
    //else
    //{
    //    sprintf(cmd, "http://%s/main.html", temp);
    //    printf("Location: %s\r\n\r\n", cmd);
//    }

    return 0;
} ```
2

I suspect you need some type of runnable file here as a cgi. Either a script or compiled code. It seems that you're trying to use "raw" C code in there. Maybe something in lua?

1 Like
3

Plus, you do not need to run any CGI at all to do a redirect on HTML.

1 Like
4

If I don't need cgi for redirection, should I configure it in lighttpd.conf?

5

index-file.name in lighttpd.conf is configured as html instead of cgi in this part.

6

You do not need to configure anything to de HTML redirection. Just create an index.html file with the proper headers, and use it as a landing page.

1 Like