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Eliminate the external dependency on the `ip` (iproute2) command-line tool by centralizing network configuration and diagnostics within a new `internal/network` package using the `netlink` library.
Changes:
- Introduced `internal/network` package to handle network interface listing and configuration.
- Replaced `exec.Command("ip", "link")` in `internal/namespace.VerifyIsolation` with `network.ListInterfaces()`.
- Improved `VerifyIsolation` to explicitly ensure only the loopback interface is present in a fresh network namespace.
- Moved interface and routing configuration logic from `internal/wireguard` to `internal/network`.
- Removed unnecessary `os/exec` imports from network-related files.
This change increases the tool's portability by removing the requirement for `iproute2` to be installed in the target environment.
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- Introduce `namespace.Ops` interface to decouple `Manager` from system-level namespace operations, enabling easier unit testing via mocks.
- Add unit tests for `internal/paths` to verify path resolution logic across different environment configurations.
- Implement `EnsureBinary` helper in E2E tests to gracefully skip tests when `WG_WRAP_BIN` is not set, allowing `go test ./...` to pass in non-build environments.
- Apply project-wide formatting and fix linting issues.
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- Extract orchestration logic from `internal/cli` into a new `internal/manager` package for better composability.
- Migrate technical implementation details from README.md to package-level godoc strings.
- Rewrite README.md to be more user-centric, focusing on quick start and usage.
- Add comprehensive documentation for exported structs and fields across the project.
- Verify all changes with `go fmt`, `go vet`, `golangci-lint`, and full E2E test suite.
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- Remove leftover DEBUG prints from CLI and wireguard internal packages.
- Silence stdout during successful command wrapping to ensure only the wrapped command's output is visible.
- Redirect all warnings and internal errors to stderr.
- Implement a verbose mode via `WG_WRAP_VERBOSE=1` to enable tunnel status messages.
- Update E2E tests to use verbose mode for verification of tunnel lifecycle events.
- Fix errcheck linting issue in wireguard.go and apply go fmt.
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- Fix DNS resolver leaks by creating temporary resolv.conf files within the profile's runtime directory and ensuring robust cleanup.
- Fix isolation block directory leaks by explicitly removing the block directory during namespace unpinning.
- Improve namespace lifecycle management:
- Register processes before joining an active namespace to prevent race conditions in reference counting.
- Update `IsLastProcess` and corresponding tests to reflect the unregister-then-check cleanup flow.
- Improve test reliability and correctness:
- Convert `TestAppRun_ProfileDirInjection` to use separate binary execution, preventing process replacement and ensuring `t.TempDir()` cleanup.
- Replace hardcoded test configuration paths with `t.TempDir()` in `mount_leak_test.go`.
- Implement `SetEnvOverrides` helper for cleaner environment variable management in E2E tests.
- Improve E2E lifecycle tests with better environment handling and output redirection.
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public domain license
- Update go.mod and all internal imports to reflect the new module path
- Add LICENSE file with the Unlicense (public domain dedication)
- Increase timeouts in e2e lifecycle tests to prevent flaky failures
- Verify all tests, linting, and formatting pass with the new module name
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- fix(cli): resolve Flock self-deadlock in ExecuteCommand cleanup by reusing the existing lockFile handle if already held during premature exit.
- fix(wireguard): configure explicit default route destination (0.0.0.0/0 for IPv4 and ::/0 for IPv6) to avoid netlink "either Dst.IP, Src.IP or Gw must be set" error.
- fix(wireguard): initialize the Tunnel return parameter in StartTunnel to prevent a nil pointer dereference.
- test(e2e): fix argument ordering in waitForLifecycle to pass "test-lifecycle" first, and increase sleep duration of dummy processes to 1.0s to ensure reliable process persistence under race detection.
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- Security: Eliminate namespace escape risk by removing `HostBind` and enforcing `FDBind` using pre-opened host socket FDs.
- Security: Replace unsafe `atoi` with `strtol` and strict validation in the C launcher to prevent malformed PID joins.
- Stability: Fix PID wraparound by storing session timestamps in PID files to detect recycled PIDs.
- Stability: Resolve DNS mount leaks by implementing proper unmounting of `/etc/resolv.conf` during tunnel shutdown.
- Performance: Optimize `FDBind` throughput by implementing batch packet processing in the receive loop.
- Deployment: Implement `memfd_create` for the C launcher to support `noexec` temporary directories and reduce disk I/O.
- Maintenance: Replace external `ip` CLI dependency with native `netlink` library for robust network configuration.
- Quality: Fix all `golangci-lint` errors and replace remaining panics with explicit error handling.
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- Simplify namespace bootstrapping by introducing `prepareLauncher` helper
- Implement a cleanup stack in `StartTunnel` to ensure orderly resource release on error
- Streamline temporary file and mount lifecycles in `ConfigureResolvConf` and `BlockHostServices`
- Ensure `Tunnel.Close()` also closes the underlying TUN device
- Reduce redundant manual cleanup calls using defer-based error handling
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- DNS Leak / Isolation Bypass: Blocked glibc's systemd-resolved and
D-Bus socket communication within the unprivileged mount namespace by
introducing BlockHostServices(). This targeted mount-blocking forces
glibc to fall back to the standard resolv.conf DNS routing path and
prevents host leaks.
- Lifecycle Race: Reordered and protected the reference-counting
cleanup routine under the profile flock to ensure that check-and-unpin
operations are atomic and do not teardown namespaces actively used
by parallel processes.
- Editor Arguments: Split the EDITOR environment variable into discrete
field tokens before invocation to support editor configurations
containing command-line flags.
- Testing: Added E2E regression tests for DNS leak detection,
namespace unpinning concurrency, and editor argument parsing. All E2E
tests now compile and pass cleanly.
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concurrency races, and resource leaks
This commit addresses several security vulnerabilities, undefined behaviors, race conditions, and resource leaks across the application:
1. Path Traversal & Arbitrary File/Directory Actions:
- Implemented `IsValidProfileName` in `internal/cli/cli.go` to restrict profile names to alphanumeric characters, dashes, and underscores.
- Applied validation to all CLI paths (`--profile`, `import`, `configure`, `delete`, `stop`) to prevent directory traversal and unauthorized directory or file creations/deletions.
- Added `TestIsValidProfileName` in `internal/cli/cli_test.go`.
2. Network Namespace Escape via Compromised Thread recycling:
- Fixed `HostBind.Open` in `internal/wireguard/wireguard.go` to panic immediately instead of returning an error if restoring the isolated namespace fails. This prevents Go from returning the compromised thread (still in host namespace) to the runtime pool.
3. Concurrency Race Conditions & Thread Migration:
- Added `runtime.LockOSThread()` in `JoinExistingNamespace` (`internal/namespace/pinning.go`) to ensure the goroutine stays on the modified namespace thread before executing the command.
- Implemented profile locking using advisory file locks (`unix.Flock`) on a `.lock` file in the user's runtime directory (with platform stubs in `internal/namespace/lock_linux.go` and `internal/namespace/lock_stub.go`).
- Integrated locking during `App.Run` and `App.ExecuteCommand`, releasing the lock right before spawning the wrapped process.
4. File Descriptor Leaks on Bootstrap Failures:
- Refactored `Bootstrap()` in `internal/namespace/namespace.go` to use named return values and a deferred cleanup loop that closes `execFd`, `hostNetFd`, and the duplicated `hostSocketFd` if `syscall.Exec` fails.
- Added an explicit `conn.Close()` on the original socket connection after duplication.
5. Glibc Undefined Behavior / Crash on argc == 0:
- Corrected `internal/namespace/launcher_src/launcher.c` to not reference `argv[0]` when `argc < 1`. Recompiled `internal/namespace/launcher.bin`.
6. DNS Fallback Usability & Import Safety:
- Added validation in `ExecuteCommand` to issue a warning when falling back to `1.1.1.1` if the configuration does not route all traffic (`0.0.0.0/0` or `::/0`).
- Prevented silent overwrites in `handleProfileImport` if the destination profile already exists, and added a corresponding unit test verifying failure.
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- Unlink the temporary bootstrap launcher binary immediately after opening a read-only descriptor to it, then execute via `/proc/self/fd/<fd>` to ensure zero-disk footprint on execution.
- Unlink temporary `/tmp/resolvconf*` files immediately after successful bind-mounting over `/etc/resolv.conf`.
- Prune parent ephemeral profile directories when unpinning a namespace, leaving zero directories behind once empty.
- Propagate the exact exit status of the wrapped command to the host process using `errors.As` and `*exec.ExitError` instead of defaulting to exit code 1.
- Added E2E automated test `TestExitCodePropagation` to verify exit status delivery.
- Added the `$(BINARY)` target to `.PHONY` in the Makefile to delegate dependency tracking to Go's compiler cache, ensuring modified Go files are rebuilt during `make test`.
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profile configuration
Completed the remaining roadmap and documentation requirements by implementing robust unprivileged DNS management, completing the profile configuration subcommand, and resolving data-plane transition socket crashes.
Detailed changes:
- **DNS Isolation**: Implemented `ConfigureResolvConf` in `internal/wireguard/wireguard.go` to override `/etc/resolv.conf` within the unprivileged network/mount namespace. Transitioned the mount namespace to private propagation (`MS_PRIVATE`) and safely bind-mounted a temporary resolv.conf file over `/etc/resolv.conf` without mutating the host's configuration.
- **DNS Precedence Order**: Integrated CLI flag `--dns-server`, parsed `.conf` interface DNS parameters, and added a safe default fallback (`1.1.1.1`) to ensure absolute host DNS leak prevention inside wrapped sessions.
- **Socket Duplication in FDBind**: Resolved a lifecycle panic in `FDBind` where `wireguard-go` called `Close` and `Open` during device state transitions, causing "use of closed network connection" errors. Implemented file descriptor duplication using `unix.Dup` during bind initialization to gracefully persist the host-socket context across interface transitions and allow clean exit synchronization.
- **Profile Configuration**: Implemented `handleProfileConfigure` in `internal/cli/cli.go` to launch the default system `$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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