wfrisch

#!/usr/bin/env python3
"""
Deliberately broken HTTP server that responds with either
- false Content-Length
- broken chunked encoding
both triggering ChunkedEncodingError in clients using `python-requests`:
- ChunkedEncodingError: Connection broken: IncompleteRead
- ChunkedEncodingError: Connection broken: InvalidChunkLength
"""

mgerstner

When trying to enter a user namespace and still communicating with the rest of the Linux system via D-Bus then this won't work:

$ unshare -U -r
$ root # dbus-monitor --system
Failed to open connection to system bus: Did not receive a reply. Possible causes include: \
 the remote application did not send a reply, the message bus security policy blocked the reply, \
 the reply timeout expired, or the network connection was broken.

The reason for this is a bit intricate. It is not found on kernel permission level but in the D-Bus userspace logic. It is explained in this mailing list post:

jhass

#!/bin/bash

# Parameters
socket="/run/foo.sock"
dump="/tmp/capture.pcap"

# Extract repetition
port=9876
source_socket="$(dirname "${socket}")/$(basename "${socket}").orig"