Detect interfaces per platform; add macOS and single-interface support (closes #2)
Linux runs exactly as before when both bridge interfaces exist. When they do not, the lone default-route interface is monitored, and a single interface now draws a single UI pane instead of an empty second one. macOS is newly supported: a running VPN tunnel (utun) is monitored as the primary pane alongside the physical default-route interface, or the physical interface alone when no VPN is up. Detection lives in internal/netdetect: interface/route data types, pure selection logic keyed on OS name, and route parsers, all unit-tested on Linux for both platforms. Only the real route query and the per-platform TCP dial binding (source address on Linux, IP_BOUND_IF on macOS) are build-tagged. Ping argument construction is a pure, OS-keyed function. NewMonitor now takes a list of interfaces. Model: opus-4-8
This commit is contained in:
@@ -1,33 +1,70 @@
|
||||
# rtnetmon
|
||||
|
||||
Real-time network monitoring dashboard for Linux systems with dual-interface support.
|
||||
Real-time network monitoring dashboard for Linux and macOS, with one- or
|
||||
two-interface support.
|
||||
|
||||
## Overview
|
||||
|
||||
rtnetmon is a terminal-based network monitoring tool that provides real-time
|
||||
visibility into network health, packet loss, and latency across two network
|
||||
interfaces simultaneously. It's designed for Linux systems and uses ncurses
|
||||
for a clean, real-time dashboard interface.
|
||||
visibility into network health, packet loss, and latency across one or two
|
||||
network interfaces simultaneously. It runs on Linux and macOS and uses a
|
||||
terminal dashboard interface.
|
||||
|
||||
## Features
|
||||
|
||||
- **Dual Interface Monitoring**: Monitor two network interfaces simultaneously
|
||||
- **Interface Monitoring**: Monitor one or two network interfaces simultaneously
|
||||
- **Real-time Updates**: Live dashboard with sub-second updates
|
||||
- **Comprehensive Metrics**:
|
||||
- ICMP reachability tests
|
||||
- Packet loss percentage
|
||||
- TCP connection latency
|
||||
- Interface health status
|
||||
- **Visual Indicators**: Color-coded status, spinners, and meters for quick status assessment
|
||||
- Packet loss meter uses reverse coloring (empty/green = good, full/red = bad)
|
||||
- **Visual Indicators**: Color-coded status, spinners, and meters for quick
|
||||
status assessment
|
||||
- Packet loss meter uses reverse coloring (empty/green = good, full/red =
|
||||
bad)
|
||||
- **Detailed Logging**: Optional logging to file for debugging and analysis
|
||||
|
||||
## Requirements
|
||||
|
||||
- Linux operating system
|
||||
- Linux or macOS
|
||||
- Go 1.21 or later
|
||||
- Root/sudo access (for raw ICMP packets)
|
||||
- `ping` command available in PATH
|
||||
- On Linux: `ip` (with `/proc/net/route` as a fallback)
|
||||
- On macOS: `netstat`
|
||||
|
||||
## Platform support and interface detection
|
||||
|
||||
rtnetmon monitors either one or two interfaces, chosen automatically for the
|
||||
platform it runs on. When only one interface is detected, the dashboard shows a
|
||||
single pane.
|
||||
|
||||
**Linux.** The two named interfaces (`--ifaceA`/`--ifaceB`, default
|
||||
`gu0`/`backhaul0`) are used when both exist — this is the original dual-bridge
|
||||
setup, unchanged. When neither exists, the single default-route interface is
|
||||
monitored instead.
|
||||
|
||||
**macOS.** The physical internet interface is found from the default route. When
|
||||
a VPN client is running (Mullvad and similar clients create a `utun` tunnel that
|
||||
carries a default route or holds a routable address), that tunnel is monitored
|
||||
as the primary pane alongside the physical interface. With no VPN running, only
|
||||
the physical interface is monitored. Interface names are detected on macOS; the
|
||||
`--ifaceA`/`--ifaceB` flags are not used there, but `--labelA`/`--labelB` still
|
||||
set the pane labels.
|
||||
|
||||
### Supported matrix
|
||||
|
||||
| OS | Interfaces monitored |
|
||||
| ----- | ----------------------------------------------------------- |
|
||||
| Linux | `gu0` + `backhaul0` when both exist (two panes) |
|
||||
| Linux | the single default-route interface otherwise (one pane) |
|
||||
| macOS | VPN tunnel + physical default-route interface (two panes) |
|
||||
| macOS | the physical default-route interface with no VPN (one pane) |
|
||||
|
||||
Anything outside this matrix — on Linux, only one of the named pair present, or
|
||||
no/multiple default routes when neither is present; on macOS, no default route
|
||||
or more than one physical default route — exits with a clear error.
|
||||
|
||||
## Installation
|
||||
|
||||
@@ -65,11 +102,17 @@ rtnetmon/
|
||||
├── internal/
|
||||
│ ├── cli/ # Command-line interface using Cobra
|
||||
│ │ └── root.go
|
||||
│ ├── netdetect/ # Per-platform interface/route detection and selection
|
||||
│ │ ├── netdetect.go # Selection logic and route parsers (pure)
|
||||
│ │ ├── routes_linux.go # Linux default-route query (build-tagged)
|
||||
│ │ └── routes_darwin.go # macOS default-route query (build-tagged)
|
||||
│ └── monitor/ # Core monitoring functionality
|
||||
│ ├── monitor.go # Main monitoring types and functions
|
||||
│ ├── loops.go # Monitoring loops (reachability, loss, TCP)
|
||||
│ ├── styles.go # Terminal color styles
|
||||
│ └── ui.go # User interface rendering
|
||||
│ ├── ui.go # User interface rendering
|
||||
│ ├── dial_linux.go # TCP source binding (build-tagged)
|
||||
│ └── dial_darwin.go # TCP IP_BOUND_IF binding (build-tagged)
|
||||
├── go.mod
|
||||
├── go.sum
|
||||
├── Makefile
|
||||
@@ -103,8 +146,11 @@ The monitor package provides an object-oriented API for programmatic use:
|
||||
```go
|
||||
import "git.eeqj.de/sneak/rtnetmon/internal/monitor"
|
||||
|
||||
// Create a new monitor
|
||||
mon := monitor.NewMonitor("eth0", "Primary", "wlan0", "Backup", "/tmp/monitor.log")
|
||||
// Create a new monitor for one or two interfaces
|
||||
mon := monitor.NewMonitor([]monitor.IfaceSpec{
|
||||
{Name: "eth0", Label: "Primary"},
|
||||
{Name: "wlan0", Label: "Backup"},
|
||||
}, "/tmp/monitor.log")
|
||||
|
||||
// Configure timing parameters (optional - defaults are sensible)
|
||||
mon.ICMPTimeout = 1 * time.Second
|
||||
|
||||
@@ -1,7 +1,4 @@
|
||||
//go:build linux
|
||||
// +build linux
|
||||
|
||||
// netmon – dual-interface network dashboard (curses)
|
||||
// netmon – network dashboard (curses) for Linux and macOS
|
||||
// WTFPL – 2025-05-16 sneak@sneak.berlin
|
||||
package main
|
||||
|
||||
|
||||
@@ -6,6 +6,7 @@ require (
|
||||
github.com/gdamore/tcell/v2 v2.8.1
|
||||
github.com/spf13/cobra v1.8.0
|
||||
github.com/spf13/viper v1.18.2
|
||||
golang.org/x/sys v0.29.0
|
||||
)
|
||||
|
||||
require (
|
||||
@@ -29,7 +30,6 @@ require (
|
||||
go.uber.org/atomic v1.9.0 // indirect
|
||||
go.uber.org/multierr v1.9.0 // indirect
|
||||
golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
|
||||
golang.org/x/sys v0.29.0 // indirect
|
||||
golang.org/x/term v0.28.0 // indirect
|
||||
golang.org/x/text v0.21.0 // indirect
|
||||
gopkg.in/ini.v1 v1.67.0 // indirect
|
||||
|
||||
+47
-6
@@ -1,18 +1,17 @@
|
||||
//go:build linux
|
||||
// +build linux
|
||||
|
||||
package cli
|
||||
|
||||
import (
|
||||
"context"
|
||||
"os"
|
||||
"os/signal"
|
||||
"runtime"
|
||||
"syscall"
|
||||
|
||||
"github.com/spf13/cobra"
|
||||
"github.com/spf13/viper"
|
||||
|
||||
"git.eeqj.de/sneak/rtnetmon/internal/monitor"
|
||||
"git.eeqj.de/sneak/rtnetmon/internal/netdetect"
|
||||
)
|
||||
|
||||
// Config holds the application configuration
|
||||
@@ -73,12 +72,17 @@ func init() {
|
||||
_ = viper.BindPFlag("logfile", rootCmd.Flags().Lookup("logfile"))
|
||||
}
|
||||
|
||||
func runMonitor(cmd *cobra.Command, args []string) error {
|
||||
func runMonitor(cmd *cobra.Command, _ []string) error {
|
||||
monitor.Logf(cfg.LogFile, "Starting rtnetmon")
|
||||
monitor.Logf(cfg.LogFile, "Monitoring interfaces %s and %s", cfg.IfaceA, cfg.IfaceB)
|
||||
|
||||
// Detect which interfaces to monitor for this platform.
|
||||
specs, err := detectInterfaces(cmd)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Create the monitor
|
||||
mon := monitor.NewMonitor(cfg.IfaceA, cfg.LabelA, cfg.IfaceB, cfg.LabelB, cfg.LogFile)
|
||||
mon := monitor.NewMonitor(specs, cfg.LogFile)
|
||||
|
||||
// Add reachability hosts
|
||||
for _, host := range cfg.Hosts {
|
||||
@@ -112,6 +116,43 @@ func runMonitor(cmd *cobra.Command, args []string) error {
|
||||
return mon.Run(ctx)
|
||||
}
|
||||
|
||||
// detectInterfaces enumerates the host, reads its default routes, and applies
|
||||
// the platform selection rules to decide which interfaces to monitor.
|
||||
func detectInterfaces(cmd *cobra.Command) ([]monitor.IfaceSpec, error) {
|
||||
ifaces, err := netdetect.Interfaces()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
routes, err := netdetect.DefaultRoutes()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
flags := netdetect.Flags{
|
||||
IfaceA: cfg.IfaceA,
|
||||
LabelA: cfg.LabelA,
|
||||
IfaceB: cfg.IfaceB,
|
||||
LabelB: cfg.LabelB,
|
||||
LabelASet: cmd.Flags().Changed("labelA"),
|
||||
LabelBSet: cmd.Flags().Changed("labelB"),
|
||||
}
|
||||
|
||||
panes, err := netdetect.Select(runtime.GOOS, ifaces, routes, flags)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
specs := make([]monitor.IfaceSpec, len(panes))
|
||||
for i, p := range panes {
|
||||
specs[i] = monitor.IfaceSpec{Name: p.Name, Label: p.Label}
|
||||
}
|
||||
|
||||
monitor.Logf(cfg.LogFile, "Monitoring %d interface(s)", len(specs))
|
||||
|
||||
return specs, nil
|
||||
}
|
||||
|
||||
// Execute runs the root command
|
||||
func Execute() error {
|
||||
return rootCmd.Execute()
|
||||
|
||||
@@ -1,6 +1,3 @@
|
||||
//go:build linux
|
||||
// +build linux
|
||||
|
||||
package cli
|
||||
|
||||
import (
|
||||
|
||||
@@ -0,0 +1,36 @@
|
||||
//go:build darwin
|
||||
|
||||
package monitor
|
||||
|
||||
import (
|
||||
"net"
|
||||
"syscall"
|
||||
|
||||
"golang.org/x/sys/unix"
|
||||
)
|
||||
|
||||
// bindControl returns a socket control hook that pins the connection to the
|
||||
// given interface with IP_BOUND_IF. On macOS a bound source address is not
|
||||
// enough: without this the kernel still routes the packets over the VPN's
|
||||
// default route, so traffic would not leave the interface we are measuring.
|
||||
func bindControl(iface string) func(network, address string, c syscall.RawConn) error {
|
||||
ifi, err := net.InterfaceByName(iface)
|
||||
if err != nil {
|
||||
return nil
|
||||
}
|
||||
|
||||
idx := ifi.Index
|
||||
|
||||
return func(_, _ string, c syscall.RawConn) error {
|
||||
var setErr error
|
||||
|
||||
ctrlErr := c.Control(func(fd uintptr) {
|
||||
setErr = unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_BOUND_IF, idx)
|
||||
})
|
||||
if ctrlErr != nil {
|
||||
return ctrlErr
|
||||
}
|
||||
|
||||
return setErr
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,12 @@
|
||||
//go:build linux
|
||||
|
||||
package monitor
|
||||
|
||||
import "syscall"
|
||||
|
||||
// bindControl returns no socket control hook on Linux: binding the dialer's
|
||||
// local source address (as tcpDuration already does) is enough to send
|
||||
// traffic out of the chosen interface.
|
||||
func bindControl(_ string) func(network, address string, c syscall.RawConn) error {
|
||||
return nil
|
||||
}
|
||||
@@ -1,6 +1,3 @@
|
||||
//go:build linux
|
||||
// +build linux
|
||||
|
||||
package monitor
|
||||
|
||||
import (
|
||||
|
||||
+54
-23
@@ -1,6 +1,3 @@
|
||||
//go:build linux
|
||||
// +build linux
|
||||
|
||||
package monitor
|
||||
|
||||
import (
|
||||
@@ -11,6 +8,7 @@ import (
|
||||
"net"
|
||||
"os"
|
||||
"os/exec"
|
||||
"runtime"
|
||||
"strconv"
|
||||
"strings"
|
||||
"sync"
|
||||
@@ -53,9 +51,8 @@ type Monitor struct {
|
||||
packetLossHosts []string
|
||||
tcpHosts []string
|
||||
|
||||
// Interfaces
|
||||
interfaceA *InterfaceStatus
|
||||
interfaceB *InterfaceStatus
|
||||
// Interfaces to monitor (one or two)
|
||||
interfaces []*InterfaceStatus
|
||||
|
||||
// Logging
|
||||
logFile string
|
||||
@@ -68,9 +65,16 @@ type Monitor struct {
|
||||
mu sync.RWMutex
|
||||
}
|
||||
|
||||
// NewMonitor creates a new Monitor instance with default settings
|
||||
func NewMonitor(ifaceA, labelA, ifaceB, labelB, logFile string) *Monitor {
|
||||
return &Monitor{
|
||||
// IfaceSpec names one interface to monitor and its display label.
|
||||
type IfaceSpec struct {
|
||||
Name string
|
||||
Label string
|
||||
}
|
||||
|
||||
// NewMonitor creates a new Monitor instance with default settings, monitoring
|
||||
// the given interfaces (one or two).
|
||||
func NewMonitor(ifaces []IfaceSpec, logFile string) *Monitor {
|
||||
m := &Monitor{
|
||||
// Default timing configuration
|
||||
ICMPTimeout: 500 * time.Millisecond,
|
||||
TCPTimeout: 500 * time.Millisecond,
|
||||
@@ -94,15 +98,17 @@ func NewMonitor(ifaceA, labelA, ifaceB, labelB, logFile string) *Monitor {
|
||||
packetLossHosts: []string{},
|
||||
tcpHosts: []string{},
|
||||
|
||||
// Initialize interfaces
|
||||
interfaceA: NewInterfaceStatus(ifaceA, labelA),
|
||||
interfaceB: NewInterfaceStatus(ifaceB, labelB),
|
||||
|
||||
// Logging
|
||||
logFile: logFile,
|
||||
|
||||
startTime: time.Now(),
|
||||
}
|
||||
|
||||
for _, spec := range ifaces {
|
||||
m.interfaces = append(m.interfaces, NewInterfaceStatus(spec.Name, spec.Label))
|
||||
}
|
||||
|
||||
return m
|
||||
}
|
||||
|
||||
// AddReachabilityHost adds a host for reachability monitoring
|
||||
@@ -159,12 +165,11 @@ func (m *Monitor) Run(ctx context.Context) error {
|
||||
tcpHosts := append([]string{}, m.tcpHosts...)
|
||||
m.mu.RUnlock()
|
||||
|
||||
go m.reachLoop(ctx, m.interfaceA, reachHosts)
|
||||
go m.reachLoop(ctx, m.interfaceB, reachHosts)
|
||||
go m.lossLoop(ctx, m.interfaceA, lossHosts)
|
||||
go m.lossLoop(ctx, m.interfaceB, lossHosts)
|
||||
go m.tcpLoop(ctx, m.interfaceA, tcpHosts)
|
||||
go m.tcpLoop(ctx, m.interfaceB, tcpHosts)
|
||||
for _, st := range m.interfaces {
|
||||
go m.reachLoop(ctx, st, reachHosts)
|
||||
go m.lossLoop(ctx, st, lossHosts)
|
||||
go m.tcpLoop(ctx, st, tcpHosts)
|
||||
}
|
||||
|
||||
// Run UI loop
|
||||
m.logf("Starting UI loop")
|
||||
@@ -252,19 +257,45 @@ func fetchIPInfo(iface string) string {
|
||||
return fmt.Sprintf("%s [%s] %s", r.IP, r.Hostname, r.Org)
|
||||
}
|
||||
|
||||
// pingArgs builds the arguments for a single reachability ping on the given
|
||||
// OS. Linux binds the interface with -I and takes -W in seconds; macOS binds
|
||||
// with -b and takes -W in milliseconds.
|
||||
func pingArgs(goos, iface, host string) []string {
|
||||
if goos == "darwin" {
|
||||
return []string{"-b", iface, "-c1", "-W1000", host}
|
||||
}
|
||||
|
||||
return []string{"-I", iface, "-c1", "-W1", host}
|
||||
}
|
||||
|
||||
// lossArgs builds the arguments for a packet-loss ping burst of count pings.
|
||||
func lossArgs(goos, iface, host string, count int) []string {
|
||||
c := strconv.Itoa(count)
|
||||
if goos == "darwin" {
|
||||
return []string{"-q", "-i", "0.05", "-c", c, "-W1000", "-b", iface, host}
|
||||
}
|
||||
|
||||
return []string{"-q", "-i", "0.05", "-c", c, "-W1", "-I", iface, host}
|
||||
}
|
||||
|
||||
// pingOnce performs a single ping
|
||||
func (m *Monitor) pingOnce(iface, host string) bool {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), m.ICMPTimeout)
|
||||
defer cancel()
|
||||
return exec.CommandContext(ctx, "ping", "-I", iface, "-c1", "-W1", host).Run() == nil
|
||||
|
||||
args := pingArgs(runtime.GOOS, iface, host)
|
||||
|
||||
return exec.CommandContext(ctx, "ping", args...).Run() == nil
|
||||
}
|
||||
|
||||
// lossPercent calculates packet loss percentage
|
||||
func (m *Monitor) lossPercent(iface, host string) float64 {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
|
||||
defer cancel()
|
||||
out, err := exec.CommandContext(ctx, "ping", "-q", "-i", "0.05",
|
||||
"-c", fmt.Sprint(m.PacketLossPings), "-W1", "-I", iface, host).CombinedOutput()
|
||||
|
||||
args := lossArgs(runtime.GOOS, iface, host, m.PacketLossPings)
|
||||
|
||||
out, err := exec.CommandContext(ctx, "ping", args...).CombinedOutput()
|
||||
if err != nil {
|
||||
return 1.0
|
||||
}
|
||||
@@ -302,7 +333,7 @@ func (m *Monitor) tcpDuration(iface, hp string) time.Duration {
|
||||
if err != nil {
|
||||
return m.TCPTimeout
|
||||
}
|
||||
d := net.Dialer{Timeout: m.TCPTimeout, LocalAddr: la}
|
||||
d := net.Dialer{Timeout: m.TCPTimeout, LocalAddr: la, Control: bindControl(iface)}
|
||||
st := time.Now()
|
||||
c, err := d.Dial("tcp", hp)
|
||||
if err != nil {
|
||||
|
||||
@@ -1,6 +1,3 @@
|
||||
//go:build linux
|
||||
// +build linux
|
||||
|
||||
package monitor
|
||||
|
||||
import (
|
||||
@@ -10,27 +7,26 @@ import (
|
||||
// TestNewMonitor tests the creation of a new Monitor
|
||||
func TestNewMonitor(t *testing.T) {
|
||||
// Test that we can create a monitor without errors
|
||||
mon := NewMonitor("test0", "Test Interface A", "test1", "Test Interface B", "/tmp/test.log")
|
||||
mon := NewMonitor([]IfaceSpec{
|
||||
{Name: "test0", Label: "Test Interface A"},
|
||||
{Name: "test1", Label: "Test Interface B"},
|
||||
}, "/tmp/test.log")
|
||||
|
||||
if mon == nil {
|
||||
t.Fatal("NewMonitor returned nil")
|
||||
}
|
||||
|
||||
// Check interfaces
|
||||
if mon.interfaceA == nil {
|
||||
t.Fatal("interfaceA is nil")
|
||||
if len(mon.interfaces) != 2 {
|
||||
t.Fatalf("Expected 2 interfaces, got %d", len(mon.interfaces))
|
||||
}
|
||||
|
||||
if mon.interfaceB == nil {
|
||||
t.Fatal("interfaceB is nil")
|
||||
if mon.interfaces[0].Name != "test0" {
|
||||
t.Errorf("Expected interfaces[0].Name to be 'test0', got '%s'", mon.interfaces[0].Name)
|
||||
}
|
||||
|
||||
if mon.interfaceA.Name != "test0" {
|
||||
t.Errorf("Expected interfaceA.Name to be 'test0', got '%s'", mon.interfaceA.Name)
|
||||
}
|
||||
|
||||
if mon.interfaceB.Name != "test1" {
|
||||
t.Errorf("Expected interfaceB.Name to be 'test1', got '%s'", mon.interfaceB.Name)
|
||||
if mon.interfaces[1].Name != "test1" {
|
||||
t.Errorf("Expected interfaces[1].Name to be 'test1', got '%s'", mon.interfaces[1].Name)
|
||||
}
|
||||
|
||||
// Check default configuration
|
||||
@@ -56,9 +52,25 @@ func TestNewMonitor(t *testing.T) {
|
||||
}
|
||||
}
|
||||
|
||||
// TestNewMonitorSingle verifies a monitor can be built with one interface.
|
||||
func TestNewMonitorSingle(t *testing.T) {
|
||||
mon := NewMonitor([]IfaceSpec{{Name: "eth0", Label: "default route"}}, "")
|
||||
|
||||
if len(mon.interfaces) != 1 {
|
||||
t.Fatalf("Expected 1 interface, got %d", len(mon.interfaces))
|
||||
}
|
||||
|
||||
if mon.interfaces[0].Name != "eth0" {
|
||||
t.Errorf("Expected interfaces[0].Name to be 'eth0', got '%s'", mon.interfaces[0].Name)
|
||||
}
|
||||
}
|
||||
|
||||
// TestAddHosts tests adding hosts to the monitor
|
||||
func TestAddHosts(t *testing.T) {
|
||||
mon := NewMonitor("test0", "Test A", "test1", "Test B", "")
|
||||
mon := NewMonitor([]IfaceSpec{
|
||||
{Name: "test0", Label: "Test A"},
|
||||
{Name: "test1", Label: "Test B"},
|
||||
}, "")
|
||||
|
||||
// Test adding reachability hosts
|
||||
mon.AddReachabilityHost("8.8.8.8")
|
||||
|
||||
@@ -0,0 +1,48 @@
|
||||
package monitor
|
||||
|
||||
import (
|
||||
"reflect"
|
||||
"testing"
|
||||
)
|
||||
|
||||
func TestPingArgs(t *testing.T) {
|
||||
tests := []struct {
|
||||
goos string
|
||||
want []string
|
||||
}{
|
||||
{"linux", []string{"-I", "eth0", "-c1", "-W1", "8.8.8.8"}},
|
||||
{"darwin", []string{"-b", "eth0", "-c1", "-W1000", "8.8.8.8"}},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.goos, func(t *testing.T) {
|
||||
got := pingArgs(tt.goos, "eth0", "8.8.8.8")
|
||||
if !reflect.DeepEqual(got, tt.want) {
|
||||
t.Errorf("pingArgs(%q) = %v, want %v", tt.goos, got, tt.want)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
func TestLossArgs(t *testing.T) {
|
||||
tests := []struct {
|
||||
goos string
|
||||
want []string
|
||||
}{
|
||||
{"linux", []string{
|
||||
"-q", "-i", "0.05", "-c", "20", "-W1", "-I", "eth0", "8.8.8.8",
|
||||
}},
|
||||
{"darwin", []string{
|
||||
"-q", "-i", "0.05", "-c", "20", "-W1000", "-b", "eth0", "8.8.8.8",
|
||||
}},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.goos, func(t *testing.T) {
|
||||
got := lossArgs(tt.goos, "eth0", "8.8.8.8", 20)
|
||||
if !reflect.DeepEqual(got, tt.want) {
|
||||
t.Errorf("lossArgs(%q) = %v, want %v", tt.goos, got, tt.want)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
@@ -1,6 +1,3 @@
|
||||
//go:build linux
|
||||
// +build linux
|
||||
|
||||
package monitor
|
||||
|
||||
import tcell "github.com/gdamore/tcell/v2"
|
||||
|
||||
@@ -1,6 +1,3 @@
|
||||
//go:build linux
|
||||
// +build linux
|
||||
|
||||
package monitor
|
||||
|
||||
import (
|
||||
|
||||
@@ -1,6 +1,3 @@
|
||||
//go:build linux
|
||||
// +build linux
|
||||
|
||||
package monitor
|
||||
|
||||
import (
|
||||
@@ -345,10 +342,11 @@ func (m *Monitor) uiLoop(ctx context.Context) {
|
||||
// Draw the runtime
|
||||
Put(m.screen, 0, 3, "Runtime: "+time.Since(m.startTime).Round(time.Second).String(), CDefault)
|
||||
|
||||
// Draw interfaces
|
||||
// Draw interfaces (one pane each; a single interface draws one pane)
|
||||
y := 5
|
||||
y = m.DrawInterface(m.screen, y, w, m.interfaceA)
|
||||
_ = m.DrawInterface(m.screen, y, w, m.interfaceB)
|
||||
for _, st := range m.interfaces {
|
||||
y = m.DrawInterface(m.screen, y, w, st)
|
||||
}
|
||||
|
||||
// Show the screen
|
||||
m.screen.Show()
|
||||
|
||||
@@ -0,0 +1,359 @@
|
||||
// Package netdetect chooses which network interfaces rtnetmon should monitor.
|
||||
//
|
||||
// The host-specific queries (enumerating interfaces, reading the routing
|
||||
// table) live behind small data types so the selection logic and the route
|
||||
// parsers are pure functions that can be unit-tested on any OS with fake
|
||||
// data. Only the real routing-table query is build-tagged per platform.
|
||||
package netdetect
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"net"
|
||||
"sort"
|
||||
"strconv"
|
||||
"strings"
|
||||
)
|
||||
|
||||
// Interface is a network interface reduced to what detection needs.
|
||||
type Interface struct {
|
||||
Name string
|
||||
Up bool
|
||||
IPv4 []string
|
||||
}
|
||||
|
||||
// Route is one routing-table entry reduced to what detection needs.
|
||||
type Route struct {
|
||||
Iface string
|
||||
Gateway string
|
||||
Default bool
|
||||
}
|
||||
|
||||
// Pane names one interface to display, with its label.
|
||||
type Pane struct {
|
||||
Name string
|
||||
Label string
|
||||
}
|
||||
|
||||
// Flags carries the user's --iface/--label choices and whether each label was
|
||||
// set explicitly on the command line.
|
||||
type Flags struct {
|
||||
IfaceA string
|
||||
LabelA string
|
||||
IfaceB string
|
||||
LabelB string
|
||||
LabelASet bool
|
||||
LabelBSet bool
|
||||
}
|
||||
|
||||
// Interfaces enumerates the host's interfaces and their IPv4 addresses. This
|
||||
// uses the standard library and is the same on every platform.
|
||||
func Interfaces() ([]Interface, error) {
|
||||
ifs, err := net.Interfaces()
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("listing interfaces: %w", err)
|
||||
}
|
||||
|
||||
out := make([]Interface, 0, len(ifs))
|
||||
for _, ifi := range ifs {
|
||||
var v4 []string
|
||||
|
||||
addrs, _ := ifi.Addrs()
|
||||
for _, a := range addrs {
|
||||
if n, ok := a.(*net.IPNet); ok && n.IP.To4() != nil {
|
||||
v4 = append(v4, n.IP.String())
|
||||
}
|
||||
}
|
||||
|
||||
out = append(out, Interface{
|
||||
Name: ifi.Name,
|
||||
Up: ifi.Flags&net.FlagUp != 0,
|
||||
IPv4: v4,
|
||||
})
|
||||
}
|
||||
|
||||
return out, nil
|
||||
}
|
||||
|
||||
// Select decides which one or two interfaces to monitor for the given OS.
|
||||
// See the README's supported matrix for the exact rules.
|
||||
func Select(goos string, ifaces []Interface, routes []Route, f Flags) ([]Pane, error) {
|
||||
switch goos {
|
||||
case "linux":
|
||||
return selectLinux(ifaces, routes, f)
|
||||
case "darwin":
|
||||
return selectDarwin(ifaces, routes, f)
|
||||
default:
|
||||
return nil, fmt.Errorf("unsupported operating system %q", goos)
|
||||
}
|
||||
}
|
||||
|
||||
// selectLinux keeps today's behavior: if both configured interfaces exist,
|
||||
// monitor them as two panes; if neither exists, monitor the single
|
||||
// default-route interface; anything else is an error.
|
||||
func selectLinux(ifaces []Interface, routes []Route, f Flags) ([]Pane, error) {
|
||||
haveA := hasInterface(ifaces, f.IfaceA)
|
||||
haveB := hasInterface(ifaces, f.IfaceB)
|
||||
|
||||
switch {
|
||||
case haveA && haveB:
|
||||
return []Pane{
|
||||
{Name: f.IfaceA, Label: f.LabelA},
|
||||
{Name: f.IfaceB, Label: f.LabelB},
|
||||
}, nil
|
||||
case !haveA && !haveB:
|
||||
name, err := onlyDefaultRoute(routes)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return []Pane{{Name: name, Label: singleLabel(f)}}, nil
|
||||
default:
|
||||
return nil, fmt.Errorf(
|
||||
"found only one of the configured interfaces (%q, %q); "+
|
||||
"rtnetmon needs both, or neither (default route only)",
|
||||
f.IfaceA, f.IfaceB)
|
||||
}
|
||||
}
|
||||
|
||||
// selectDarwin monitors the physical default-route interface, plus a VPN
|
||||
// tunnel as the primary pane when one is running.
|
||||
func selectDarwin(ifaces []Interface, routes []Route, f Flags) ([]Pane, error) {
|
||||
vpn := findVPN(ifaces, routes)
|
||||
|
||||
phys, err := onlyPhysicalDefaultRoute(routes, vpn)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if vpn == "" {
|
||||
return []Pane{{Name: phys, Label: singleLabel(f)}}, nil
|
||||
}
|
||||
|
||||
return []Pane{
|
||||
{Name: vpn, Label: labelOr(f.LabelA, f.LabelASet, "VPN")},
|
||||
{Name: phys, Label: labelOr(f.LabelB, f.LabelBSet, "default route")},
|
||||
}, nil
|
||||
}
|
||||
|
||||
// findVPN returns the name of a VPN tunnel interface, or "" if none is
|
||||
// running. A tunnel counts as a running VPN when it carries a default route,
|
||||
// or when it is up with a routable (non-link-local) IPv4 address. Idle system
|
||||
// tunnels have only a link-local IPv6 address and are skipped.
|
||||
func findVPN(ifaces []Interface, routes []Route) string {
|
||||
routeIfaces := map[string]bool{}
|
||||
for _, r := range routes {
|
||||
if r.Default {
|
||||
routeIfaces[r.Iface] = true
|
||||
}
|
||||
}
|
||||
|
||||
sorted := append([]Interface(nil), ifaces...)
|
||||
sort.Slice(sorted, func(i, j int) bool { return sorted[i].Name < sorted[j].Name })
|
||||
|
||||
for _, ifi := range sorted {
|
||||
if !isTunnel(ifi.Name) {
|
||||
continue
|
||||
}
|
||||
if routeIfaces[ifi.Name] {
|
||||
return ifi.Name
|
||||
}
|
||||
if ifi.Up && hasRoutableIPv4(ifi) {
|
||||
return ifi.Name
|
||||
}
|
||||
}
|
||||
|
||||
return ""
|
||||
}
|
||||
|
||||
// onlyDefaultRoute returns the single default-route interface, or an error if
|
||||
// there is not exactly one.
|
||||
func onlyDefaultRoute(routes []Route) (string, error) {
|
||||
names := defaultRouteIfaces(routes, "")
|
||||
|
||||
switch len(names) {
|
||||
case 1:
|
||||
return names[0], nil
|
||||
case 0:
|
||||
return "", fmt.Errorf(
|
||||
"no default route found; rtnetmon needs one internet interface")
|
||||
default:
|
||||
return "", fmt.Errorf(
|
||||
"multiple default-route interfaces found (%s); rtnetmon supports only one",
|
||||
strings.Join(names, ", "))
|
||||
}
|
||||
}
|
||||
|
||||
// onlyPhysicalDefaultRoute returns the single non-tunnel default-route
|
||||
// interface (ignoring the VPN), or an error if there is not exactly one.
|
||||
func onlyPhysicalDefaultRoute(routes []Route, vpn string) (string, error) {
|
||||
names := defaultRouteIfaces(routes, vpn)
|
||||
|
||||
switch len(names) {
|
||||
case 1:
|
||||
return names[0], nil
|
||||
case 0:
|
||||
return "", fmt.Errorf(
|
||||
"no physical default-route interface found; " +
|
||||
"rtnetmon needs one internet interface")
|
||||
default:
|
||||
return "", fmt.Errorf(
|
||||
"multiple physical default-route interfaces found (%s); "+
|
||||
"rtnetmon supports only one",
|
||||
strings.Join(names, ", "))
|
||||
}
|
||||
}
|
||||
|
||||
// defaultRouteIfaces returns the sorted, unique interface names that carry a
|
||||
// default route, excluding the named VPN interface and any other tunnel.
|
||||
func defaultRouteIfaces(routes []Route, vpn string) []string {
|
||||
seen := map[string]bool{}
|
||||
|
||||
var names []string
|
||||
|
||||
for _, r := range routes {
|
||||
if !r.Default || r.Iface == vpn || isTunnel(r.Iface) || seen[r.Iface] {
|
||||
continue
|
||||
}
|
||||
|
||||
seen[r.Iface] = true
|
||||
names = append(names, r.Iface)
|
||||
}
|
||||
|
||||
sort.Strings(names)
|
||||
|
||||
return names
|
||||
}
|
||||
|
||||
// hasInterface reports whether an interface with the given name exists.
|
||||
func hasInterface(ifaces []Interface, name string) bool {
|
||||
for _, ifi := range ifaces {
|
||||
if ifi.Name == name {
|
||||
return true
|
||||
}
|
||||
}
|
||||
|
||||
return false
|
||||
}
|
||||
|
||||
// isTunnel reports whether the interface name is a macOS userspace tunnel
|
||||
// (utunN), which is what Mullvad and other WireGuard/OpenVPN clients use.
|
||||
func isTunnel(name string) bool {
|
||||
return strings.HasPrefix(name, "utun")
|
||||
}
|
||||
|
||||
// hasRoutableIPv4 reports whether the interface has an IPv4 address that is
|
||||
// neither loopback nor link-local.
|
||||
func hasRoutableIPv4(ifi Interface) bool {
|
||||
for _, s := range ifi.IPv4 {
|
||||
ip := net.ParseIP(s)
|
||||
if ip == nil || ip.IsLoopback() || ip.IsLinkLocalUnicast() {
|
||||
continue
|
||||
}
|
||||
|
||||
return true
|
||||
}
|
||||
|
||||
return false
|
||||
}
|
||||
|
||||
// singleLabel is the label for a lone pane: the explicit --labelA if given,
|
||||
// otherwise a plain description.
|
||||
func singleLabel(f Flags) string {
|
||||
return labelOr(f.LabelA, f.LabelASet, "default route")
|
||||
}
|
||||
|
||||
// labelOr returns value when it was set explicitly, otherwise fallback.
|
||||
func labelOr(value string, set bool, fallback string) string {
|
||||
if set {
|
||||
return value
|
||||
}
|
||||
|
||||
return fallback
|
||||
}
|
||||
|
||||
// parseIPRoute reads `ip -4 route show default` output. Every printed line is
|
||||
// a default route.
|
||||
func parseIPRoute(out string) []Route {
|
||||
var routes []Route
|
||||
|
||||
for _, line := range strings.Split(out, "\n") {
|
||||
fields := strings.Fields(line)
|
||||
if len(fields) == 0 || fields[0] != "default" {
|
||||
continue
|
||||
}
|
||||
|
||||
r := Route{Default: true}
|
||||
for i := 0; i < len(fields)-1; i++ {
|
||||
switch fields[i] {
|
||||
case "dev":
|
||||
r.Iface = fields[i+1]
|
||||
case "via":
|
||||
r.Gateway = fields[i+1]
|
||||
}
|
||||
}
|
||||
|
||||
if r.Iface != "" {
|
||||
routes = append(routes, r)
|
||||
}
|
||||
}
|
||||
|
||||
return routes
|
||||
}
|
||||
|
||||
// parseProcNetRoute reads /proc/net/route. A default route has destination
|
||||
// 00000000; the gateway is a little-endian hex IPv4 address.
|
||||
func parseProcNetRoute(out string) []Route {
|
||||
var routes []Route
|
||||
|
||||
for i, line := range strings.Split(out, "\n") {
|
||||
if i == 0 { // column header
|
||||
continue
|
||||
}
|
||||
|
||||
fields := strings.Fields(line)
|
||||
if len(fields) < 3 || fields[1] != "00000000" {
|
||||
continue
|
||||
}
|
||||
|
||||
routes = append(routes, Route{
|
||||
Iface: fields[0],
|
||||
Gateway: hexToIP(fields[2]),
|
||||
Default: true,
|
||||
})
|
||||
}
|
||||
|
||||
return routes
|
||||
}
|
||||
|
||||
// parseNetstat reads `netstat -rn -f inet` output (macOS). Rows whose
|
||||
// destination is "default" are default routes; the Netif column (field 4)
|
||||
// names the interface.
|
||||
func parseNetstat(out string) []Route {
|
||||
var routes []Route
|
||||
|
||||
for _, line := range strings.Split(out, "\n") {
|
||||
fields := strings.Fields(line)
|
||||
if len(fields) < 4 || fields[0] != "default" {
|
||||
continue
|
||||
}
|
||||
|
||||
routes = append(routes, Route{
|
||||
Iface: fields[3],
|
||||
Gateway: fields[1],
|
||||
Default: true,
|
||||
})
|
||||
}
|
||||
|
||||
return routes
|
||||
}
|
||||
|
||||
// hexToIP converts a little-endian hex IPv4 address (as found in
|
||||
// /proc/net/route) to dotted-quad form.
|
||||
func hexToIP(h string) string {
|
||||
v, err := strconv.ParseUint(h, 16, 32)
|
||||
if err != nil {
|
||||
return ""
|
||||
}
|
||||
|
||||
return fmt.Sprintf("%d.%d.%d.%d", v&0xff, (v>>8)&0xff, (v>>16)&0xff, (v>>24)&0xff)
|
||||
}
|
||||
@@ -0,0 +1,238 @@
|
||||
package netdetect
|
||||
|
||||
import (
|
||||
"reflect"
|
||||
"testing"
|
||||
)
|
||||
|
||||
// gu and backhaul are the Linux bridge interfaces rtnetmon was built for.
|
||||
func linuxFlags() Flags {
|
||||
return Flags{
|
||||
IfaceA: "gu0", LabelA: "gu LAN - VPN outbound",
|
||||
IfaceB: "backhaul0", LabelB: "Cox cable direct",
|
||||
}
|
||||
}
|
||||
|
||||
func TestSelect(t *testing.T) {
|
||||
tests := []struct {
|
||||
name string
|
||||
goos string
|
||||
ifaces []Interface
|
||||
routes []Route
|
||||
flags Flags
|
||||
want []Pane
|
||||
wantErr bool
|
||||
}{
|
||||
{
|
||||
name: "linux both bridge interfaces present",
|
||||
goos: "linux",
|
||||
ifaces: []Interface{
|
||||
{Name: "gu0", Up: true},
|
||||
{Name: "backhaul0", Up: true},
|
||||
{Name: "eth0", Up: true},
|
||||
},
|
||||
routes: []Route{{Iface: "eth0", Default: true}},
|
||||
flags: linuxFlags(),
|
||||
want: []Pane{
|
||||
{Name: "gu0", Label: "gu LAN - VPN outbound"},
|
||||
{Name: "backhaul0", Label: "Cox cable direct"},
|
||||
},
|
||||
},
|
||||
{
|
||||
name: "linux no bridge interfaces, single default route",
|
||||
goos: "linux",
|
||||
ifaces: []Interface{{Name: "eth0", Up: true}, {Name: "lo", Up: true}},
|
||||
routes: []Route{{Iface: "eth0", Default: true}},
|
||||
flags: linuxFlags(),
|
||||
want: []Pane{{Name: "eth0", Label: "default route"}},
|
||||
},
|
||||
{
|
||||
name: "linux only one bridge interface present is an error",
|
||||
goos: "linux",
|
||||
ifaces: []Interface{{Name: "gu0", Up: true}, {Name: "eth0", Up: true}},
|
||||
routes: []Route{{Iface: "eth0", Default: true}},
|
||||
flags: linuxFlags(),
|
||||
wantErr: true,
|
||||
},
|
||||
{
|
||||
name: "linux no bridge, no default route is an error",
|
||||
goos: "linux",
|
||||
ifaces: []Interface{{Name: "eth0", Up: true}},
|
||||
routes: nil,
|
||||
flags: linuxFlags(),
|
||||
wantErr: true,
|
||||
},
|
||||
{
|
||||
name: "linux no bridge, multiple default routes is an error",
|
||||
goos: "linux",
|
||||
ifaces: []Interface{{Name: "eth0", Up: true}, {Name: "eth1", Up: true}},
|
||||
routes: []Route{{Iface: "eth0", Default: true}, {Iface: "eth1", Default: true}},
|
||||
flags: linuxFlags(),
|
||||
wantErr: true,
|
||||
},
|
||||
{
|
||||
name: "linux single default route keeps explicit label",
|
||||
goos: "linux",
|
||||
ifaces: []Interface{
|
||||
{Name: "wlan0", Up: true},
|
||||
},
|
||||
routes: []Route{{Iface: "wlan0", Default: true}},
|
||||
flags: Flags{
|
||||
IfaceA: "gu0", LabelA: "Home WiFi", LabelASet: true,
|
||||
IfaceB: "backhaul0", LabelB: "Cox cable direct",
|
||||
},
|
||||
want: []Pane{{Name: "wlan0", Label: "Home WiFi"}},
|
||||
},
|
||||
{
|
||||
name: "macos vpn tunnel plus physical default route",
|
||||
goos: "darwin",
|
||||
ifaces: []Interface{
|
||||
{Name: "en0", Up: true, IPv4: []string{"192.168.1.20"}},
|
||||
{Name: "utun4", Up: true, IPv4: []string{"10.64.0.2"}},
|
||||
{Name: "utun0", Up: true, IPv4: nil},
|
||||
},
|
||||
routes: []Route{
|
||||
{Iface: "utun4", Default: true},
|
||||
{Iface: "en0", Default: true},
|
||||
},
|
||||
flags: linuxFlags(),
|
||||
want: []Pane{
|
||||
{Name: "utun4", Label: "VPN"},
|
||||
{Name: "en0", Label: "default route"},
|
||||
},
|
||||
},
|
||||
{
|
||||
name: "macos vpn detected by routable address without its own route",
|
||||
goos: "darwin",
|
||||
ifaces: []Interface{
|
||||
{Name: "en0", Up: true, IPv4: []string{"192.168.1.20"}},
|
||||
{Name: "utun6", Up: true, IPv4: []string{"10.2.0.2"}},
|
||||
},
|
||||
routes: []Route{{Iface: "en0", Default: true}},
|
||||
flags: linuxFlags(),
|
||||
want: []Pane{
|
||||
{Name: "utun6", Label: "VPN"},
|
||||
{Name: "en0", Label: "default route"},
|
||||
},
|
||||
},
|
||||
{
|
||||
name: "macos no vpn, single physical default route",
|
||||
goos: "darwin",
|
||||
ifaces: []Interface{
|
||||
{Name: "en0", Up: true, IPv4: []string{"192.168.1.20"}},
|
||||
{Name: "utun0", Up: true, IPv4: nil},
|
||||
{Name: "utun1", Up: true, IPv4: []string{"169.254.1.1"}},
|
||||
},
|
||||
routes: []Route{{Iface: "en0", Default: true}},
|
||||
flags: linuxFlags(),
|
||||
want: []Pane{{Name: "en0", Label: "default route"}},
|
||||
},
|
||||
{
|
||||
name: "macos vpn pane honors explicit labels",
|
||||
goos: "darwin",
|
||||
ifaces: []Interface{
|
||||
{Name: "en0", Up: true, IPv4: []string{"192.168.1.20"}},
|
||||
{Name: "utun4", Up: true, IPv4: []string{"10.64.0.2"}},
|
||||
},
|
||||
routes: []Route{
|
||||
{Iface: "utun4", Default: true},
|
||||
{Iface: "en0", Default: true},
|
||||
},
|
||||
flags: Flags{
|
||||
LabelA: "Mullvad", LabelASet: true,
|
||||
LabelB: "Fiber", LabelBSet: true,
|
||||
},
|
||||
want: []Pane{
|
||||
{Name: "utun4", Label: "Mullvad"},
|
||||
{Name: "en0", Label: "Fiber"},
|
||||
},
|
||||
},
|
||||
{
|
||||
name: "macos no default route is an error",
|
||||
goos: "darwin",
|
||||
ifaces: []Interface{{Name: "en0", Up: true, IPv4: []string{"192.168.1.20"}}},
|
||||
routes: nil,
|
||||
flags: linuxFlags(),
|
||||
wantErr: true,
|
||||
},
|
||||
{
|
||||
name: "macos two physical default routes is an error",
|
||||
goos: "darwin",
|
||||
ifaces: []Interface{
|
||||
{Name: "en0", Up: true, IPv4: []string{"192.168.1.20"}},
|
||||
{Name: "en1", Up: true, IPv4: []string{"192.168.2.20"}},
|
||||
},
|
||||
routes: []Route{
|
||||
{Iface: "en0", Default: true},
|
||||
{Iface: "en1", Default: true},
|
||||
},
|
||||
flags: linuxFlags(),
|
||||
wantErr: true,
|
||||
},
|
||||
{
|
||||
name: "unsupported operating system is an error",
|
||||
goos: "windows",
|
||||
wantErr: true,
|
||||
},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
got, err := Select(tt.goos, tt.ifaces, tt.routes, tt.flags)
|
||||
if tt.wantErr {
|
||||
if err == nil {
|
||||
t.Fatalf("Select() expected error, got panes %v", got)
|
||||
}
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
if err != nil {
|
||||
t.Fatalf("Select() unexpected error: %v", err)
|
||||
}
|
||||
|
||||
if !reflect.DeepEqual(got, tt.want) {
|
||||
t.Errorf("Select() = %v, want %v", got, tt.want)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
func TestParseIPRoute(t *testing.T) {
|
||||
out := "default via 192.168.1.1 dev eth0 proto dhcp metric 100\n"
|
||||
got := parseIPRoute(out)
|
||||
want := []Route{{Iface: "eth0", Gateway: "192.168.1.1", Default: true}}
|
||||
|
||||
if !reflect.DeepEqual(got, want) {
|
||||
t.Errorf("parseIPRoute() = %v, want %v", got, want)
|
||||
}
|
||||
}
|
||||
|
||||
func TestParseProcNetRoute(t *testing.T) {
|
||||
out := "Iface\tDestination\tGateway\tFlags\tRefCnt\tUse\tMetric\tMask\n" +
|
||||
"eth0\t00000000\t0102A8C0\t0003\t0\t0\t100\t00000000\n" +
|
||||
"eth0\t0002A8C0\t00000000\t0001\t0\t0\t0\t00FFFFFF\n"
|
||||
got := parseProcNetRoute(out)
|
||||
want := []Route{{Iface: "eth0", Gateway: "192.168.2.1", Default: true}}
|
||||
|
||||
if !reflect.DeepEqual(got, want) {
|
||||
t.Errorf("parseProcNetRoute() = %v, want %v", got, want)
|
||||
}
|
||||
}
|
||||
|
||||
func TestParseNetstat(t *testing.T) {
|
||||
out := "Routing tables\n\nInternet:\n" +
|
||||
"Destination Gateway Flags Netif Expire\n" +
|
||||
"default 10.0.0.1 UGScg en0\n" +
|
||||
"default link#15 UCSg utun4\n" +
|
||||
"127.0.0.1 127.0.0.1 UH lo0\n"
|
||||
got := parseNetstat(out)
|
||||
want := []Route{
|
||||
{Iface: "en0", Gateway: "10.0.0.1", Default: true},
|
||||
{Iface: "utun4", Gateway: "link#15", Default: true},
|
||||
}
|
||||
|
||||
if !reflect.DeepEqual(got, want) {
|
||||
t.Errorf("parseNetstat() = %v, want %v", got, want)
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,16 @@
|
||||
//go:build darwin
|
||||
|
||||
package netdetect
|
||||
|
||||
import "os/exec"
|
||||
|
||||
// DefaultRoutes returns the host's IPv4 default routes, read from the macOS
|
||||
// routing table.
|
||||
func DefaultRoutes() ([]Route, error) {
|
||||
out, err := exec.Command("netstat", "-rn", "-f", "inet").Output()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return parseNetstat(string(out)), nil
|
||||
}
|
||||
@@ -0,0 +1,26 @@
|
||||
//go:build linux
|
||||
|
||||
package netdetect
|
||||
|
||||
import (
|
||||
"os"
|
||||
"os/exec"
|
||||
)
|
||||
|
||||
// DefaultRoutes returns the host's IPv4 default routes. It prefers the `ip`
|
||||
// command and falls back to reading /proc/net/route.
|
||||
func DefaultRoutes() ([]Route, error) {
|
||||
out, err := exec.Command("ip", "-4", "route", "show", "default").Output()
|
||||
if err == nil {
|
||||
if routes := parseIPRoute(string(out)); len(routes) > 0 {
|
||||
return routes, nil
|
||||
}
|
||||
}
|
||||
|
||||
data, err := os.ReadFile("/proc/net/route")
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return parseProcNetRoute(string(data)), nil
|
||||
}
|
||||
Reference in New Issue
Block a user