# Meta

*Meta* is a small Nginx/PHP tool displaying some informations in order to debug or satisfy your curiosity.

## Use

### Paths

* `/me` will redirect to `/<your-ip-address>`
* `/<any-ip-address>` will print informations obtained from databases located in the `geolite2` directory
* `/emoji` will print an emoji list
* `/<anything-else>` will print *IP*, *TCP*, *TLS* and *HTTP* metadata

### Domains

`meta.antopie.org` have working A (IPv4) and AAAA (IPv6) records

You can test IP version connectivity by forcing it throught:

* `ipv4.meta.antopie.org`, which only have the A record
* `ipv6.meta.antopie.org`, which only have the AAAA record

## Nginx configuration sample

```
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;

    server_name meta.antopie.org;

    root /var/www/meta;
    index index.php;
    try_files $uri/ /;

    location ~ \.php$ {
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass unix:/var/run/php/meta.sock;
        include inc/fastcgi.conf;
        fastcgi_param SSL_CURVES $ssl_curves;
        fastcgi_param SSL_CIPHERS $ssl_ciphers;
        fastcgi_param SSL_CIPHER $ssl_cipher;
        fastcgi_param SSL_PROTOCOL $ssl_protocol;
        fastcgi_param SSL_SESSION_ID $ssl_session_id;
        fastcgi_param NGINX_VERSION $nginx_version;
        fastcgi_param TCPINFO_RTT $tcpinfo_rtt;
        fastcgi_param TCPINFO_RTTVAR $tcpinfo_rttvar;
        fastcgi_param TCPINFO_SND_CWND $tcpinfo_snd_cwnd;
        fastcgi_param TCPINFO_RCV_SPACE $tcpinfo_rcv_space;
        fastcgi_param CONNECTION $connection;
        fastcgi_param CONNECTION_REQUESTS $connection_requests;
        fastcgi_param REQUEST $request;
    }

    location ~ emojis.txt {
        charset utf-8;
    }
}
```

## Resources

Nginx variable list: <https://nginx.org/docs/varindex.html>

PHP $_SERVER list: <https://www.php.net/manual/reserved.variables.server.php>

### HTTP headers

* <https://en.wikipedia.org/wiki/List_of_HTTP_header_fields>
* <https://developer.mozilla.org/docs/Web/HTTP/Headers>
* <https://datatracker.ietf.org/doc/html/rfc7231>

## Free software

*Meta* is published under **AGPLv3+** (see `LICENSE`), it's source code is available at <https://code.antopie.org/miraty/meta>. `db-reader` and `geolite2` directories contents have their own licenses.