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OpenShell/examples
John Myers 4ec54503c2 feat(sandbox): log connection attempts that bypass proxy path
Add iptables LOG + REJECT rules inside the sandbox network namespace to
detect and diagnose direct connection attempts that bypass the HTTP
CONNECT proxy. This provides two improvements:

1. Fast-fail UX: applications get immediate ECONNREFUSED instead of a
   30-second timeout when they bypass the proxy
2. Diagnostics: a /dev/kmsg monitor emits structured BYPASS_DETECT
   tracing events with destination, protocol, process identity, and
   actionable hints

Both TCP and UDP bypass attempts are covered (UDP catches DNS bypass).
The feature degrades gracefully if iptables or /dev/kmsg are unavailable.

Closes #268
2026-03-15 12:45:36 -07:00
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