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chore(kb/netcat): revise article, split by userland
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Michele Cereda
59
knowledge base/gnu userland/netcat.md
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59
knowledge base/gnu userland/netcat.md
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# Netcat
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> TODO
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Intro
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1. [TL;DR](#tldr)
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1. [Further readings](#further-readings)
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## TL;DR
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<details>
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<summary>Setup</summary>
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```sh
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brew install 'netcat'
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```
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</details>
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<details>
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<summary>Usage</summary>
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```sh
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# Listen (server mode).
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netcat --listen --local-port '8080'
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nc -lp '8080'
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```
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</details>
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<!-- Uncomment if used
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<details>
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<summary>Real world use cases</summary>
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```sh
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```
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</details>
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-->
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## Further readings
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- [Website]
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- [Codebase]
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<!--
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Reference
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═╬═Time══
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-->
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<!-- In-article sections -->
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<!-- Knowledge base -->
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<!-- Files -->
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<!-- Upstream -->
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[Codebase]: https://sourceforge.net/p/netcat/code/HEAD/tree/
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[Website]: https://netcat.sourceforge.net/
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<!-- Others -->
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@@ -1,55 +0,0 @@
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# Netcat
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1. [TL;DR](#tldr)
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1. [Further readings](#further-readings)
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1. [Sources](#sources)
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## TL;DR
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Options of interest:
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- `-N`: close the network socket when finished; not available in nmap's netcat
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- `-l`: bind to the port and listen for incoming connections (server mode)
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- `-n`: do not resolve hostnames via DNS
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- `-p`: specify the source port to use
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- `-t`: use telnet negotiation
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- `-u`: use UDP
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- `-v`: set verbosity level; can be used several times
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- `-w=SECS`: timeout for connects and final net reads, in seconds
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- `-z`: zero-I/O mode, exit once connected
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```sh
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# Install
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dnf install 'nmap-ncat'
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yum install 'nmap-ncat'
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# Check ports on hosts.
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nc -Nnvz 192.168.0.81 22-25
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nc -Nvz host.name 443
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nc -Nvz -u dns.server 123
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# List hosts with a specific port open.
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# But you might just want to use `nmap`.
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parallel -j 0 "nc -Nnvz -w 2 192.168.0.{} 22 2>&1" ::: {2..254} \
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| grep -v "timed out"
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# Wait for a host to be up.
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until nc -Nvz -w 3 pi.lan 22; do sleep 3; done
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# Listen mode.
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nc -l 5666
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```
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## Further readings
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### Sources
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- [How To use Netcat to establish and test TCP and UDP connections]
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<!--
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Reference
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═╬═Time══
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-->
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<!-- Others -->
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[how to use netcat to establish and test tcp and udp connections]: https://www.digitalocean.com/community/tutorials/how-to-use-netcat-to-establish-and-test-tcp-and-udp-connections
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59
knowledge base/nmap's netcat.md
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59
knowledge base/nmap's netcat.md
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# Nmap's netcat
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1. [TL;DR](#tldr)
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1. [Further readings](#further-readings)
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1. [Sources](#sources)
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## TL;DR
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Options of interest:
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| Option | Summary |
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| ------------------- | --------------------------------------------------------------------------------- |
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| `-l`, `--listen` | bind to the port given in input and listen for incoming connections (server mode) |
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| `-k`, `--keep-open` | accept multiple connections in listen mode |
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| `-n`, `--nodns` | do not resolve hostnames via DNS |
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| `-p` | specify the source port to use |
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| `-t` | use telnet negotiation |
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| `-u` | use UDP |
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| `-v` | set verbosity level; can be used several times |
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| `-w=SECS` | timeout for connects and final net reads, in seconds |
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| `-z` | zero-I/O mode, exit once connected |
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```sh
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# Install
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brew install 'nmap'
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dnf install 'nmap-ncat'
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yum install 'nmap-ncat'
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# Check ports on hosts.
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nc -Nnvz 192.168.0.81 22-25
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nc -Nvz host.name 443
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nc -Nvz -u dns.server 123
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# List hosts with a specific port open.
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# But you might just want to use `nmap`.
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parallel -j 0 "nc -Nnvz -w 2 192.168.0.{} 22 2>&1" ::: {2..254} \
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| grep -v "timed out"
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# Wait for a host to be up.
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until nc -Nvz -w 3 pi.lan 22; do sleep 3; done
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# Server mode.
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nc -l 5666
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nc -lk 8080
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```
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## Further readings
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### Sources
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- [How To use Netcat to establish and test TCP and UDP connections]
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<!--
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Reference
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═╬═Time══
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-->
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<!-- Others -->
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[how to use netcat to establish and test tcp and udp connections]: https://www.digitalocean.com/community/tutorials/how-to-use-netcat-to-establish-and-test-tcp-and-udp-connections
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