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--- redes:notas:nc [2018/11/01 16:29] – cayu
+++ redes:notas:nc [2018/11/01 16:35] (actual) – cayu
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-====== Netcat ======
+==== Netcat ====
-Netcat es una herramienta de red que permite a través de intérprete de comandos y con una sintaxis sencilla abrir puertos TCP/UDP en un HOST, asociar una shell a un puerto en concreto y forzar conexiones UDP/TCP.
+Netcat is a featured networking utility which reads and writes data across network connections, using the TCP/IP protocol.
+It is designed to be a reliable "back-end" tool that can be used directly or easily driven by other programs and scripts. At the same time, it is a feature-rich network debugging and exploration tool, since it can create almost any kind of connection you would need and has several interesting built-in capabilities.
+It provides access to the following main features:
+    * Outbound and inbound connections, TCP or UDP, to or from any ports.
+    * Featured tunneling mode which allows also special tunneling such as UDP to TCP, with the possibility of specifying all network parameters (source port/interface, listening port/interface, and the remote host allowed to connect to the tunnel.
+    * Built-in port-scanning capabilities, with randomizer.
+    * Advanced usage options, such as buffered send-mode (one line every N seconds), and hexdump (to stderr or to a specified file) of trasmitted and received data.
+    * Optional RFC854 telnet codes parser and responder.
+The GNU Netcat is distributed freely under the GNU General Public License (GPL).
+==== Ejemplos de uso ====
+=== GET HTTP ===
+<code bash>
+echo  -e "GET / HTTP/1.0\r\n" | nc 192.168.1.1 80
+</code>
+=== Pasar un archivo de un equipo a otros ===
+Desde el servidor
+<code>
+cat backup.iso | nc -l 3333
+</code>
+Desde el cliente
+<code>
+nc 192.168.0.1 3333 > backup.iso
+</code>
+Si queremos poner un contador
+<code>
+nc 192.168.0.1 3333 | pv -b > backup.iso
+</code>
+Otro ejemplo
+Desde el servidor
+<code>
+dd if=/dev/hdb5 | gzip -9 | nc -l 3333
+</code>
+Desde el cliente
+<code>
+nc 192.168.0.1 3333 | pv -b > myhdb5partition.img.gz
+</code>
+=== Consultando puertos abiertos ===
 <code bash>
 for port in {1..65535}; do
@@ Línea 6: / Línea 48: @@
 done
 </code>
-  * http://adamish.com/blog/archives/567
+Fuente : http://adamish.com/blog/archives/567
+=== Referencias ===
+http://netcat.sourceforge.net/
+Tutorial con ejemplos prácticos : http://crysol.org/node/28
+Mas ejemplos : http://www.g-loaded.eu/2006/11/06/netcat-a-couple-of-useful-examples/