infinity0

/*
 * Test program for the ambient capabilities
 *
 * You need to install libcap-ng-dev first, then compile using:
 *  $ gcc -lcap-ng -o ambient ambient.c && sudo setcap cap_setpcap,cap_net_raw,cap_net_admin,cap_sys_nice+eip ambient
 *
 * To get a shell with additional caps that can be inherited do:
 *
 * ./ambient /bin/bash
 */

jkstill

Decoding the data in /proc/net/tcp:

Linux 5.x  /proc/net/tcp
Linux 6.x  /proc/PID/net/tcp

Given a socket:

$ ls -l  /proc/24784/fd/11
lrwx------ 1 jkstill dba 64 Dec  4 16:22 /proc/24784/fd/11 -> socket:[15907701]

gabrielfalcao

0 = Success
1 = Operation not permitted
2 = No such file or directory
3 = No such process
4 = Interrupted system call
5 = Input/output error
6 = No such device or address
7 = Argument list too long
8 = Exec format error