etc

~ scripts and random things

git clone https://github.com/djnnvx/etc.git

commit 608f6811066051c9aaad518a9065502b46a59784
parent 031746d14f92ca5113d5259d80162d5c27ad7eb2
Author: djnn <[email protected]>
Date: Fri, 28 Mar 2025 11:40:19 +0900

feat(bin): get-tcp.sh The /proc/net/tcp file provides detailed information about the current TCP connections on the system, each line contains data about a TCP socket. It works like this: local_address: local IP and port of the connection. rem_address: remote IP and port. st: The state of the TCP connection (for example, 01 means ESTABLISHED). tx_queue and rx_queue: The transmit and receive queues. uid: The ID of the user who initiated the connection. inode: The identifier of the inode node that holds the socket.

Diffstat:

bin/get-tcp.sh

+++++++++++

1 file changed, 11 insertions(+), 0 deletions(-)

diff --git a/bin/get-tcp.sh b/bin/get-tcp.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+
+tail -n +2 /proc/net/tcp | while read -r _ local remote _; do
+    ip_local=$(echo ${local%:*} | sed 's/../0x& /g' | awk '{printf "%d.%d.%d.%d", $4, $3, $2, $1}')
+    ip_remote=$(echo ${remote%:*} | sed 's/../0x& /g' | awk '{printf "%d.%d.%d.%d", $4, $3, $2, $1}')
+    port_local=$((16#${local##*:}))
+    port_remote=$((16#${remote##*:}))
+
+    echo "$ip_local:$port_local -> $ip_remote:$port_remote"
+done
+