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profile configuration
Completed the remaining roadmap and documentation requirements by implementing robust unprivileged DNS management, completing the profile configuration subcommand, and resolving data-plane transition socket crashes.
Detailed changes:
- **DNS Isolation**: Implemented `ConfigureResolvConf` in `internal/wireguard/wireguard.go` to override `/etc/resolv.conf` within the unprivileged network/mount namespace. Transitioned the mount namespace to private propagation (`MS_PRIVATE`) and safely bind-mounted a temporary resolv.conf file over `/etc/resolv.conf` without mutating the host's configuration.
- **DNS Precedence Order**: Integrated CLI flag `--dns-server`, parsed `.conf` interface DNS parameters, and added a safe default fallback (`1.1.1.1`) to ensure absolute host DNS leak prevention inside wrapped sessions.
- **Socket Duplication in FDBind**: Resolved a lifecycle panic in `FDBind` where `wireguard-go` called `Close` and `Open` during device state transitions, causing "use of closed network connection" errors. Implemented file descriptor duplication using `unix.Dup` during bind initialization to gracefully persist the host-socket context across interface transitions and allow clean exit synchronization.
- **Profile Configuration**: Implemented `handleProfileConfigure` in `internal/cli/cli.go` to launch the default system `$EDITOR` (falling back to `vi`) on a profile, satisfying the documentation's requirements.
- **Hermetic Testing Polish**:
- Created `dns_helpers.go` providing a `MockDNSServer` packet probe.
- Added E2E tests for unprivileged DNS resolution, data-plane UDP handshake transmission, and 3-way DNS precedence routing.
- Refactored `TestNamespaceLifecycleAutomation`, `TestConfigPropagation`, and `TestMTUFragmentation` to use default profile fallbacks, fixing failing stats on missing profiles.
- Resolved all `golangci-lint` and `go fmt` warnings to maintain a completely clean static analysis pipeline.
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- Implement complete rootless network namespace bootstrap via C launcher using unshare(CLONE_NEWUSER | CLONE_NEWNS | CLONE_NEWNET).
- Resolve unprivileged network isolation blackhole via host-socket preservation (FD passing): open client UDP sockets on the host pre-isolation, clear O_CLOEXEC, and ingest them via custom `FDBind` inside the sandbox.
- Implement isolated routing table automation over `tun0` (addresses, MTU, default routes).
- Implement persistent, multi-process namespace sharing and joining using reference-counted PID files and the setns system call.
- Write robust, self-contained E2E data plane test suites in `tests/e2e/e2e_test.go` using a mock UDP listener.
- Update project documentation (`README.md` and `AGENTS.md`) to reflect completed milestones.
- Ensure 100% test passing rate and zero lint/staticcheck warnings.
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- Create internal/paths package for unified config and runtime directory resolution
- Implement robust WireGuard config parsing in pkg/wgconf
- Implement profile management subcommands: list, import, configure, delete, stop
- Fix namespace pinning path collisions (separating .ns files from pids directories)
- Implement and verify namespace unpinning logic
- Fix linting errors and improve error handling across the project
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tests
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counting
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8-bit clean argument fuzzing and portable E2E binary discovery
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