Merge pull request #6 from karol-broda/feat/reverse-dns-lookup

- Switch to nixos-25.11 for modern apple-sdk packages
- Use apple-sdk_15 which includes SecTrustCopyCertificateChain (macOS 12+)
- Required for Go 1.25 crypto/x509 compatibility on darwin

.github/workflows/ci.yaml

@@ -36,3 +36,21 @@ jobs:
         with:
           version: latest
 
+  nix-build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-14]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: DeterminateSystems/nix-installer-action@v17
+
+      - uses: DeterminateSystems/magic-nix-cache-action@v9
+
+      - name: nix flake check
+        run: nix flake check
+
+      - name: nix build
+        run: nix build
+

README.md

@@ -38,6 +38,20 @@ yay -S snitch-bin
 paru -S snitch-bin
 ```
 
+### shell script
+
+```bash
+curl -sSL https://raw.githubusercontent.com/karol-broda/snitch/master/install.sh | sh
+```
+
+installs to `~/.local/bin` if available, otherwise `/usr/local/bin`. override with:
+
+```bash
+curl -sSL https://raw.githubusercontent.com/karol-broda/snitch/master/install.sh | INSTALL_DIR=~/bin sh
+```
+
+> **macos:** the install script automatically removes the quarantine attribute (`com.apple.quarantine`) from the binary to allow it to run without gatekeeper warnings. to disable this, set `KEEP_QUARANTINE=1`.
+
 ### binary
 
 download from [releases](https://github.com/karol-broda/snitch/releases):
@@ -51,6 +65,7 @@ sudo mv snitch /usr/local/bin/
 ```
 
 > **macos:** if blocked with "cannot be opened because the developer cannot be verified", run:
+>
 > ```bash
 > xattr -d com.apple.quarantine /usr/local/bin/snitch
 > ```
@@ -131,6 +146,16 @@ snitch watch -i 1s | jq '.count'
 snitch watch -l -i 500ms
 ```
 
+### `snitch upgrade`
+
+check for updates and upgrade in-place.
+
+```bash
+snitch upgrade              # check for updates
+snitch upgrade --yes        # upgrade automatically
+snitch upgrade -v 0.1.7     # install specific version
+```
+
 ## filters
 
 shortcut flags work on all commands:

cmd/cli_test.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 	"testing"
 
-	"snitch/internal/testutil"
+	"github.com/karol-broda/snitch/internal/testutil"
 )
 
 // TestCLIContract tests the CLI interface contracts as specified in the README
@@ -71,7 +71,7 @@ func TestCLIContract(t *testing.T) {
 			name:           "version",
 			args:           []string{"version"},
 			expectExitCode: 0,
-			expectStdout:   []string{"snitch", "commit:", "built:"},
+			expectStdout:   []string{"snitch", "commit", "built"},
 			expectStderr:   nil,
 			description:    "version command should show version information",
 		},
@@ -364,7 +364,8 @@ func resetGlobalFlags() {
 	filterIPv4 = false
 	filterIPv6 = false
 	colorMode = "auto"
-	numeric = false
+	resolveAddrs = true
+	resolvePorts = false
 }
 
 // TestEnvironmentVariables tests that environment variables are properly handled

cmd/golden_test.go

@@ -9,8 +9,8 @@ import (
 	"strings"
 	"testing"
 
-	"snitch/internal/collector"
-	"snitch/internal/testutil"
+	"github.com/karol-broda/snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/testutil"
 )
 
 var updateGolden = flag.Bool("update-golden", false, "Update golden files")

cmd/json.go

@@ -15,4 +15,5 @@ var jsonCmd = &cobra.Command{
 
 func init() {
 	rootCmd.AddCommand(jsonCmd)
+	addFilterFlags(jsonCmd)
 }

cmd/ls.go

@@ -8,10 +8,10 @@ import (
 	"log"
 	"os"
 	"os/exec"
-	"snitch/internal/collector"
-	"snitch/internal/color"
-	"snitch/internal/config"
-	"snitch/internal/resolver"
+	"github.com/karol-broda/snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/color"
+	"github.com/karol-broda/snitch/internal/config"
+	"github.com/karol-broda/snitch/internal/resolver"
 	"strconv"
 	"strings"
 	"text/tabwriter"
@@ -30,7 +30,8 @@ var (
 	sortBy        string
 	fields        string
 	colorMode     string
-	numeric       bool
+	resolveAddrs  bool
+	resolvePorts  bool
 	plainOutput   bool
 )
 
@@ -51,7 +52,7 @@ Available filters:
 }
 
 func runListCommand(outputFormat string, args []string) {
-	rt, err := NewRuntime(args, colorMode, numeric)
+	rt, err := NewRuntime(args, colorMode)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -98,14 +99,18 @@ func getFieldMap(c collector.Connection) map[string]string {
 	lport := strconv.Itoa(c.Lport)
 	rport := strconv.Itoa(c.Rport)
 	
-	// Apply name resolution if not in numeric mode
-	if !numeric {
+	// apply address resolution
+	if resolveAddrs {
 		if resolvedLaddr := resolver.ResolveAddr(c.Laddr); resolvedLaddr != c.Laddr {
 			laddr = resolvedLaddr
 		}
 		if resolvedRaddr := resolver.ResolveAddr(c.Raddr); resolvedRaddr != c.Raddr && c.Raddr != "*" && c.Raddr != "" {
 			raddr = resolvedRaddr
 		}
+	}
+
+	// apply port resolution
+	if resolvePorts {
 		if resolvedLport := resolver.ResolvePort(c.Lport, c.Proto); resolvedLport != strconv.Itoa(c.Lport) {
 			lport = resolvedLport
 		}
@@ -395,7 +400,8 @@ func init() {
 	lsCmd.Flags().StringVarP(&sortBy, "sort", "s", cfg.Defaults.SortBy, "Sort by column (e.g., pid:desc)")
 	lsCmd.Flags().StringVarP(&fields, "fields", "f", strings.Join(cfg.Defaults.Fields, ","), "Comma-separated list of fields to show")
 	lsCmd.Flags().StringVar(&colorMode, "color", cfg.Defaults.Color, "Color mode (auto, always, never)")
-	lsCmd.Flags().BoolVarP(&numeric, "numeric", "n", cfg.Defaults.Numeric, "Don't resolve hostnames")
+	lsCmd.Flags().BoolVar(&resolveAddrs, "resolve-addrs", !cfg.Defaults.Numeric, "Resolve IP addresses to hostnames")
+	lsCmd.Flags().BoolVar(&resolvePorts, "resolve-ports", false, "Resolve port numbers to service names")
 	lsCmd.Flags().BoolVarP(&plainOutput, "plain", "p", false, "Plain output (parsable, no styling)")
 
 	// shared filter flags

cmd/ls_test.go

@@ -4,8 +4,8 @@ import (
 	"strings"
 	"testing"
 
-	"snitch/internal/collector"
-	"snitch/internal/testutil"
+	"github.com/karol-broda/snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/testutil"
 )
 
 func TestLsCommand_EmptyResults(t *testing.T) {

cmd/root.go

@@ -3,7 +3,7 @@ package cmd
 import (
 	"fmt"
 	"os"
-	"snitch/internal/config"
+	"github.com/karol-broda/snitch/internal/config"
 
 	"github.com/spf13/cobra"
 )
@@ -44,6 +44,8 @@ func init() {
 	cfg := config.Get()
 	rootCmd.Flags().StringVar(&topTheme, "theme", cfg.Defaults.Theme, "Theme for TUI (dark, light, mono, auto)")
 	rootCmd.Flags().DurationVarP(&topInterval, "interval", "i", 0, "Refresh interval (default 1s)")
+	rootCmd.Flags().BoolVar(&topResolveAddrs, "resolve-addrs", !cfg.Defaults.Numeric, "Resolve IP addresses to hostnames")
+	rootCmd.Flags().BoolVar(&topResolvePorts, "resolve-ports", false, "Resolve port numbers to service names")
 
 	// shared filter flags for root command
 	addFilterFlags(rootCmd)

cmd/runtime.go

@@ -2,8 +2,8 @@ package cmd
 
 import (
 	"fmt"
-	"snitch/internal/collector"
-	"snitch/internal/color"
+	"github.com/karol-broda/snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/color"
 	"strconv"
 	"strings"
 
@@ -20,8 +20,9 @@ type Runtime struct {
 	Connections []collector.Connection
 
 	// common settings
-	ColorMode string
-	Numeric   bool
+	ColorMode    string
+	ResolveAddrs bool
+	ResolvePorts bool
 }
 
 // shared filter flags - used by all commands
@@ -73,7 +74,7 @@ func FetchConnections(filters collector.FilterOptions) ([]collector.Connection,
 }
 
 // NewRuntime creates a runtime with fetched and filtered connections.
-func NewRuntime(args []string, colorMode string, numeric bool) (*Runtime, error) {
+func NewRuntime(args []string, colorMode string) (*Runtime, error) {
 	color.Init(colorMode)
 
 	filters, err := BuildFilters(args)
@@ -87,10 +88,11 @@ func NewRuntime(args []string, colorMode string, numeric bool) (*Runtime, error)
 	}
 
 	return &Runtime{
-		Filters:     filters,
-		Connections: connections,
-		ColorMode:   colorMode,
-		Numeric:     numeric,
+		Filters:      filters,
+		Connections:  connections,
+		ColorMode:    colorMode,
+		ResolveAddrs: resolveAddrs,
+		ResolvePorts: resolvePorts,
 	}, nil
 }
 

cmd/stats.go

@@ -8,7 +8,7 @@ import (
 	"log"
 	"os"
 	"os/signal"
-	"snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/collector"
 	"sort"
 	"strconv"
 	"strings"

cmd/top.go

@@ -2,8 +2,8 @@ package cmd
 
 import (
 	"log"
-	"snitch/internal/config"
-	"snitch/internal/tui"
+	"github.com/karol-broda/snitch/internal/config"
+	"github.com/karol-broda/snitch/internal/tui"
 	"time"
 
 	tea "github.com/charmbracelet/bubbletea"
@@ -12,8 +12,10 @@ import (
 
 // top-specific flags
 var (
-	topTheme    string
-	topInterval time.Duration
+	topTheme        string
+	topInterval     time.Duration
+	topResolveAddrs bool
+	topResolvePorts bool
 )
 
 var topCmd = &cobra.Command{
@@ -28,8 +30,10 @@ var topCmd = &cobra.Command{
 		}
 
 		opts := tui.Options{
-			Theme:    theme,
-			Interval: topInterval,
+			Theme:        theme,
+			Interval:     topInterval,
+			ResolveAddrs: topResolveAddrs,
+			ResolvePorts: topResolvePorts,
 		}
 
 		// if any filter flag is set, use exclusive mode
@@ -58,6 +62,8 @@ func init() {
 	// top-specific flags
 	topCmd.Flags().StringVar(&topTheme, "theme", cfg.Defaults.Theme, "Theme for TUI (dark, light, mono, auto)")
 	topCmd.Flags().DurationVarP(&topInterval, "interval", "i", time.Second, "Refresh interval")
+	topCmd.Flags().BoolVar(&topResolveAddrs, "resolve-addrs", !cfg.Defaults.Numeric, "Resolve IP addresses to hostnames")
+	topCmd.Flags().BoolVar(&topResolvePorts, "resolve-ports", false, "Resolve port numbers to service names")
 
 	// shared filter flags
 	addFilterFlags(topCmd)

cmd/trace.go

@@ -7,8 +7,8 @@ import (
 	"log"
 	"os"
 	"os/signal"
-	"snitch/internal/collector"
-	"snitch/internal/resolver"
+	"github.com/karol-broda/snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/resolver"
 	"strings"
 	"syscall"
 	"time"

cmd/upgrade.go

@@ -0,0 +1,688 @@
+package cmd
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"runtime"
+	"strconv"
+	"strings"
+
+	"github.com/fatih/color"
+	"github.com/spf13/cobra"
+
+	"github.com/karol-broda/snitch/internal/tui"
+)
+
+const (
+	repoOwner = "karol-broda"
+	repoName  = "snitch"
+	githubAPI = "https://api.github.com"
+	firstUpgradeVersion = "0.1.8"
+)
+
+var (
+	upgradeYes     bool
+	upgradeVersion string
+)
+
+var upgradeCmd = &cobra.Command{
+	Use:   "upgrade",
+	Short: "Check for updates and optionally upgrade snitch",
+	Long: `Check for available updates and show upgrade instructions.
+
+Use --yes to perform an in-place upgrade automatically.
+Use --version to install a specific version.`,
+	RunE: runUpgrade,
+}
+
+func init() {
+	upgradeCmd.Flags().BoolVarP(&upgradeYes, "yes", "y", false, "Perform the upgrade automatically")
+	upgradeCmd.Flags().StringVarP(&upgradeVersion, "version", "v", "", "Install a specific version (e.g., v0.1.7)")
+	rootCmd.AddCommand(upgradeCmd)
+}
+
+type githubRelease struct {
+	TagName string `json:"tag_name"`
+	HTMLURL string `json:"html_url"`
+}
+
+type githubCommit struct {
+	SHA string `json:"sha"`
+}
+
+type githubCompare struct {
+	Status      string `json:"status"`
+	AheadBy     int    `json:"ahead_by"`
+	BehindBy    int    `json:"behind_by"`
+	TotalCommits int   `json:"total_commits"`
+}
+
+func runUpgrade(cmd *cobra.Command, args []string) error {
+	current := Version
+	nixInstall := isNixInstall()
+	nixVersion := isNixVersion(current)
+
+	if upgradeVersion != "" {
+		if nixInstall || nixVersion {
+			return handleNixSpecificVersion(current, upgradeVersion)
+		}
+		return handleSpecificVersion(current, upgradeVersion)
+	}
+
+	latest, err := fetchLatestVersion()
+	if err != nil {
+		return fmt.Errorf("failed to check for updates: %w", err)
+	}
+
+	if nixInstall || nixVersion {
+		return handleNixUpgrade(current, latest)
+	}
+
+	currentClean := strings.TrimPrefix(current, "v")
+	latestClean := strings.TrimPrefix(latest, "v")
+
+	printVersionComparison(current, latest)
+
+	if currentClean == latestClean {
+		green := color.New(color.FgGreen)
+		green.Println(tui.SymbolSuccess + " you are running the latest version")
+		return nil
+	}
+
+	if current == "dev" {
+		yellow := color.New(color.FgYellow)
+		yellow.Println(tui.SymbolWarning + " you are running a development build")
+		fmt.Println()
+		fmt.Println("use one of the methods below to install a release version:")
+		fmt.Println()
+		printUpgradeInstructions()
+		return nil
+	}
+
+	green := color.New(color.FgGreen, color.Bold)
+	green.Printf(tui.SymbolSuccess+" update available: %s "+tui.SymbolArrowRight+" %s\n", current, latest)
+	fmt.Println()
+
+	if !upgradeYes {
+		printUpgradeInstructions()
+		fmt.Println()
+		faint := color.New(color.Faint)
+		cmdStyle := color.New(color.FgCyan)
+		faint.Print("  in-place      ")
+		cmdStyle.Println("snitch upgrade --yes")
+		return nil
+	}
+
+	return performUpgrade(latest)
+}
+
+func handleSpecificVersion(current, target string) error {
+	if !strings.HasPrefix(target, "v") {
+		target = "v" + target
+	}
+	targetClean := strings.TrimPrefix(target, "v")
+
+	printVersionComparisonTarget(current, target)
+
+	if isVersionLower(targetClean, firstUpgradeVersion) {
+		yellow := color.New(color.FgYellow)
+		yellow.Printf(tui.SymbolWarning+" warning: the upgrade command was introduced in v%s\n", firstUpgradeVersion)
+		faint := color.New(color.Faint)
+		faint.Printf("  version %s does not include this command\n", target)
+		faint.Println("  you will need to use other methods to upgrade from that version")
+		fmt.Println()
+	}
+
+	currentClean := strings.TrimPrefix(current, "v")
+	if currentClean == targetClean {
+		green := color.New(color.FgGreen)
+		green.Println(tui.SymbolSuccess + " you are already running this version")
+		return nil
+	}
+
+	if !upgradeYes {
+		faint := color.New(color.Faint)
+		cmdStyle := color.New(color.FgCyan)
+		if isVersionLower(targetClean, currentClean) {
+			yellow := color.New(color.FgYellow)
+			yellow.Printf(tui.SymbolArrowDown+" this will downgrade from %s to %s\n", current, target)
+		} else {
+			green := color.New(color.FgGreen)
+			green.Printf(tui.SymbolArrowUp+" this will upgrade from %s to %s\n", current, target)
+		}
+		fmt.Println()
+		faint.Print("run ")
+		cmdStyle.Printf("snitch upgrade --version %s --yes", target)
+		faint.Println(" to proceed")
+		return nil
+	}
+
+	return performUpgrade(target)
+}
+
+func handleNixUpgrade(current, latest string) error {
+	faint := color.New(color.Faint)
+	version := color.New(color.FgCyan)
+
+	currentCommit := extractCommitFromVersion(current)
+	dirty := isNixDirty(current)
+
+	faint.Print("current  ")
+	version.Print(current)
+	if currentCommit != "" {
+		faint.Printf(" (commit %s)", currentCommit)
+	}
+	fmt.Println()
+
+	faint.Print("latest   ")
+	version.Println(latest)
+	fmt.Println()
+
+	if dirty {
+		yellow := color.New(color.FgYellow)
+		yellow.Println(tui.SymbolWarning + " you are running a dirty nix build (uncommitted changes)")
+		fmt.Println()
+		printNixUpgradeInstructions()
+		return nil
+	}
+
+	if currentCommit == "" {
+		yellow := color.New(color.FgYellow)
+		yellow.Println(tui.SymbolWarning + " this is a nix installation")
+		faint.Println("  nix store is immutable; use nix commands to upgrade")
+		fmt.Println()
+		printNixUpgradeInstructions()
+		return nil
+	}
+
+	releaseCommit, err := fetchCommitForTag(latest)
+	if err != nil {
+		faint.Printf("  (could not fetch release commit: %v)\n", err)
+		fmt.Println()
+		yellow := color.New(color.FgYellow)
+		yellow.Println(tui.SymbolWarning + " this is a nix installation")
+		faint.Println("  nix store is immutable; use nix commands to upgrade")
+		fmt.Println()
+		printNixUpgradeInstructions()
+		return nil
+	}
+
+	releaseShort := releaseCommit
+	if len(releaseShort) > 7 {
+		releaseShort = releaseShort[:7]
+	}
+
+	if strings.HasPrefix(releaseCommit, currentCommit) || strings.HasPrefix(currentCommit, releaseShort) {
+		green := color.New(color.FgGreen)
+		green.Printf(tui.SymbolSuccess+" you are running %s (commit %s)\n", latest, releaseShort)
+		return nil
+	}
+
+	comparison, err := compareCommits(latest, currentCommit)
+	if err != nil {
+		green := color.New(color.FgGreen, color.Bold)
+		green.Printf(tui.SymbolSuccess+" update available: %s "+tui.SymbolArrowRight+" %s\n", currentCommit, latest)
+		faint.Printf("  your commit: %s\n", currentCommit)
+		faint.Printf("  release:     %s (%s)\n", releaseShort, latest)
+		fmt.Println()
+		yellow := color.New(color.FgYellow)
+		yellow.Println(tui.SymbolWarning + " this is a nix installation")
+		faint.Println("  nix store is immutable; use nix commands to upgrade")
+		fmt.Println()
+		printNixUpgradeInstructions()
+		return nil
+	}
+
+	if comparison.AheadBy > 0 {
+		cyan := color.New(color.FgCyan)
+		cyan.Printf(tui.SymbolArrowUp+" you are %d commit(s) ahead of %s\n", comparison.AheadBy, latest)
+		faint.Printf("  your commit: %s\n", currentCommit)
+		faint.Printf("  release:     %s (%s)\n", releaseShort, latest)
+		fmt.Println()
+		faint.Println("you are running a newer build than the latest release")
+		return nil
+	}
+
+	if comparison.BehindBy > 0 {
+		green := color.New(color.FgGreen, color.Bold)
+		green.Printf(tui.SymbolSuccess+" update available: %d commit(s) behind %s\n", comparison.BehindBy, latest)
+		faint.Printf("  your commit: %s\n", currentCommit)
+		faint.Printf("  release:     %s (%s)\n", releaseShort, latest)
+		fmt.Println()
+		yellow := color.New(color.FgYellow)
+		yellow.Println(tui.SymbolWarning + " this is a nix installation")
+		faint.Println("  nix store is immutable; use nix commands to upgrade")
+		fmt.Println()
+		printNixUpgradeInstructions()
+		return nil
+	}
+
+	green := color.New(color.FgGreen)
+	green.Printf(tui.SymbolSuccess+" you are running %s (commit %s)\n", latest, releaseShort)
+	return nil
+}
+
+func handleNixSpecificVersion(current, target string) error {
+	if !strings.HasPrefix(target, "v") {
+		target = "v" + target
+	}
+
+	printVersionComparisonTarget(current, target)
+
+	yellow := color.New(color.FgYellow)
+	yellow.Println(tui.SymbolWarning + " this is a nix installation")
+	faint := color.New(color.Faint)
+	faint.Println("  nix store is immutable; in-place upgrades are not supported")
+	fmt.Println()
+
+	bold := color.New(color.Bold)
+	cmd := color.New(color.FgCyan)
+
+	bold.Println("to install a specific version with nix:")
+	fmt.Println()
+
+	faint.Print("  specific ref    ")
+	cmd.Printf("nix profile install github:%s/%s/%s\n", repoOwner, repoName, target)
+
+	faint.Print("  latest          ")
+	cmd.Printf("nix profile install github:%s/%s\n", repoOwner, repoName)
+
+	return nil
+}
+
+func isVersionLower(v1, v2 string) bool {
+	parts1 := parseVersion(v1)
+	parts2 := parseVersion(v2)
+
+	for i := 0; i < 3; i++ {
+		if parts1[i] < parts2[i] {
+			return true
+		}
+		if parts1[i] > parts2[i] {
+			return false
+		}
+	}
+	return false
+}
+
+func parseVersion(v string) [3]int {
+	var parts [3]int
+	segments := strings.Split(v, ".")
+
+	for i := 0; i < len(segments) && i < 3; i++ {
+		n, err := strconv.Atoi(segments[i])
+		if err == nil {
+			parts[i] = n
+		}
+	}
+	return parts
+}
+
+func fetchLatestVersion() (string, error) {
+	url := fmt.Sprintf("%s/repos/%s/%s/releases/latest", githubAPI, repoOwner, repoName)
+
+	resp, err := http.Get(url)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("github api returned status %d", resp.StatusCode)
+	}
+
+	var release githubRelease
+	if err := json.NewDecoder(resp.Body).Decode(&release); err != nil {
+		return "", err
+	}
+
+	if release.TagName == "" {
+		return "", fmt.Errorf("no releases found")
+	}
+
+	return release.TagName, nil
+}
+
+func printVersionComparison(current, latest string) {
+	faint := color.New(color.Faint)
+	version := color.New(color.FgCyan)
+
+	faint.Print("current  ")
+	version.Println(current)
+	faint.Print("latest   ")
+	version.Println(latest)
+	fmt.Println()
+}
+
+func printVersionComparisonTarget(current, target string) {
+	faint := color.New(color.Faint)
+	version := color.New(color.FgCyan)
+
+	faint.Print("current  ")
+	version.Println(current)
+	faint.Print("target   ")
+	version.Println(target)
+	fmt.Println()
+}
+
+func printUpgradeInstructions() {
+	bold := color.New(color.Bold)
+	faint := color.New(color.Faint)
+	cmd := color.New(color.FgCyan)
+
+	bold.Println("upgrade options:")
+	fmt.Println()
+
+	faint.Print("  go install    ")
+	cmd.Printf("go install github.com/%s/%s@latest\n", repoOwner, repoName)
+
+	faint.Print("  shell script  ")
+	cmd.Printf("curl -sSL https://raw.githubusercontent.com/%s/%s/master/install.sh | sh\n", repoOwner, repoName)
+
+	faint.Print("  arch (aur)    ")
+	cmd.Println("yay -S snitch-bin")
+
+	faint.Print("  nix           ")
+	cmd.Printf("nix profile upgrade --inputs-from github:%s/%s\n", repoOwner, repoName)
+}
+
+func performUpgrade(version string) error {
+	execPath, err := os.Executable()
+	if err != nil {
+		return fmt.Errorf("failed to get executable path: %w", err)
+	}
+
+	execPath, err = filepath.EvalSymlinks(execPath)
+	if err != nil {
+		return fmt.Errorf("failed to resolve executable path: %w", err)
+	}
+
+	if strings.HasPrefix(execPath, "/nix/store/") {
+		yellow := color.New(color.FgYellow)
+		yellow.Println(tui.SymbolWarning + " cannot perform in-place upgrade for nix installation")
+		fmt.Println()
+		printNixUpgradeInstructions()
+		return nil
+	}
+
+	goos := runtime.GOOS
+	goarch := runtime.GOARCH
+
+	versionClean := strings.TrimPrefix(version, "v")
+	archiveName := fmt.Sprintf("%s_%s_%s_%s.tar.gz", repoName, versionClean, goos, goarch)
+	downloadURL := fmt.Sprintf("https://github.com/%s/%s/releases/download/%s/%s",
+		repoOwner, repoName, version, archiveName)
+
+	faint := color.New(color.Faint)
+	cyan := color.New(color.FgCyan)
+	faint.Print(tui.SymbolDownload + " downloading ")
+	cyan.Printf("%s", archiveName)
+	faint.Println("...")
+
+	resp, err := http.Get(downloadURL)
+	if err != nil {
+		return fmt.Errorf("failed to download: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("download failed with status %d", resp.StatusCode)
+	}
+
+	tmpDir, err := os.MkdirTemp("", "snitch-upgrade-*")
+	if err != nil {
+		return fmt.Errorf("failed to create temp directory: %w", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	binaryPath, err := extractBinaryFromTarGz(resp.Body, tmpDir)
+	if err != nil {
+		return fmt.Errorf("failed to extract binary: %w", err)
+	}
+
+	if goos == "darwin" {
+		removeQuarantine(binaryPath)
+	}
+
+	// check if we can write to the target location
+	targetDir := filepath.Dir(execPath)
+	if !isWritable(targetDir) {
+		yellow := color.New(color.FgYellow)
+		cmdStyle := color.New(color.FgCyan)
+
+		yellow.Printf(tui.SymbolWarning+" elevated permissions required to install to %s\n", targetDir)
+		fmt.Println()
+		faint.Println("run with sudo or install to a user-writable location:")
+		fmt.Println()
+		faint.Print("  sudo         ")
+		cmdStyle.Println("sudo snitch upgrade --yes")
+		faint.Print("  custom dir   ")
+		cmdStyle.Printf("curl -sSL https://raw.githubusercontent.com/%s/%s/master/install.sh | INSTALL_DIR=~/.local/bin sh\n",
+			repoOwner, repoName)
+		return nil
+	}
+
+	// replace the binary
+	backupPath := execPath + ".bak"
+	if err := os.Rename(execPath, backupPath); err != nil {
+		return fmt.Errorf("failed to backup current binary: %w", err)
+	}
+
+	if err := copyFile(binaryPath, execPath); err != nil {
+		// try to restore backup
+		if restoreErr := os.Rename(backupPath, execPath); restoreErr != nil {
+			return fmt.Errorf("failed to install new binary and restore backup: %w (restore error: %v)", err, restoreErr)
+		}
+		return fmt.Errorf("failed to install new binary: %w", err)
+	}
+
+	if err := os.Chmod(execPath, 0755); err != nil {
+		return fmt.Errorf("failed to set executable permissions: %w", err)
+	}
+
+	if err := os.Remove(backupPath); err != nil {
+		// non-fatal, just warn
+		yellow := color.New(color.FgYellow)
+		yellow.Fprintf(os.Stderr, tui.SymbolWarning + " warning: failed to remove backup file %s: %v\n", backupPath, err)
+	}
+
+	green := color.New(color.FgGreen, color.Bold)
+	green.Printf(tui.SymbolSuccess + " successfully upgraded to %s\n", version)
+	return nil
+}
+
+func extractBinaryFromTarGz(r io.Reader, destDir string) (string, error) {
+	gzr, err := gzip.NewReader(r)
+	if err != nil {
+		return "", err
+	}
+	defer gzr.Close()
+
+	tr := tar.NewReader(gzr)
+
+	for {
+		header, err := tr.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return "", err
+		}
+
+		if header.Typeflag != tar.TypeReg {
+			continue
+		}
+
+		// look for the snitch binary
+		name := filepath.Base(header.Name)
+		if name != repoName {
+			continue
+		}
+
+		destPath := filepath.Join(destDir, name)
+		outFile, err := os.Create(destPath)
+		if err != nil {
+			return "", err
+		}
+
+		if _, err := io.Copy(outFile, tr); err != nil {
+			outFile.Close()
+			return "", err
+		}
+		outFile.Close()
+
+		return destPath, nil
+	}
+
+	return "", fmt.Errorf("binary not found in archive")
+}
+
+func isWritable(path string) bool {
+	testFile := filepath.Join(path, ".snitch-write-test")
+	f, err := os.Create(testFile)
+	if err != nil {
+		return false
+	}
+	f.Close()
+	os.Remove(testFile)
+	return true
+}
+
+func copyFile(src, dst string) error {
+	srcFile, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer srcFile.Close()
+
+	dstFile, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer dstFile.Close()
+
+	if _, err := io.Copy(dstFile, srcFile); err != nil {
+		return err
+	}
+
+	return dstFile.Sync()
+}
+
+func removeQuarantine(path string) {
+	cmd := exec.Command("xattr", "-d", "com.apple.quarantine", path)
+	if err := cmd.Run(); err == nil {
+		faint := color.New(color.Faint)
+		faint.Println("  removed macOS quarantine attribute")
+	}
+}
+
+func isNixInstall() bool {
+	execPath, err := os.Executable()
+	if err != nil {
+		return false
+	}
+
+	resolved, err := filepath.EvalSymlinks(execPath)
+	if err != nil {
+		return false
+	}
+
+	return strings.HasPrefix(resolved, "/nix/store/")
+}
+
+var nixVersionPattern = regexp.MustCompile(`^nix-([a-f0-9]+)(-dirty)?$`)
+var commitHashPattern = regexp.MustCompile(`^[a-f0-9]{7,40}$`)
+
+func isNixVersion(version string) bool {
+	if nixVersionPattern.MatchString(version) {
+		return true
+	}
+	if commitHashPattern.MatchString(version) {
+		return true
+	}
+	return false
+}
+
+func extractCommitFromVersion(version string) string {
+	matches := nixVersionPattern.FindStringSubmatch(version)
+	if len(matches) >= 2 {
+		return matches[1]
+	}
+	if commitHashPattern.MatchString(version) {
+		return version
+	}
+	return ""
+}
+
+func isNixDirty(version string) bool {
+	return strings.HasSuffix(version, "-dirty")
+}
+
+func fetchCommitForTag(tag string) (string, error) {
+	url := fmt.Sprintf("%s/repos/%s/%s/commits/%s", githubAPI, repoOwner, repoName, tag)
+
+	resp, err := http.Get(url)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("github api returned status %d", resp.StatusCode)
+	}
+
+	var commit githubCommit
+	if err := json.NewDecoder(resp.Body).Decode(&commit); err != nil {
+		return "", err
+	}
+
+	return commit.SHA, nil
+}
+
+func compareCommits(base, head string) (*githubCompare, error) {
+	url := fmt.Sprintf("%s/repos/%s/%s/compare/%s...%s", githubAPI, repoOwner, repoName, base, head)
+
+	resp, err := http.Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("github api returned status %d", resp.StatusCode)
+	}
+
+	var compare githubCompare
+	if err := json.NewDecoder(resp.Body).Decode(&compare); err != nil {
+		return nil, err
+	}
+
+	return &compare, nil
+}
+
+func printNixUpgradeInstructions() {
+	bold := color.New(color.Bold)
+	faint := color.New(color.Faint)
+	cmd := color.New(color.FgCyan)
+
+	bold.Println("nix upgrade options:")
+	fmt.Println()
+
+	faint.Print("  flake profile   ")
+	cmd.Printf("nix profile install github:%s/%s\n", repoOwner, repoName)
+
+	faint.Print("  flake update    ")
+	cmd.Println("nix flake update snitch  (in your system/home-manager config)")
+
+	faint.Print("  rebuild         ")
+	cmd.Println("nixos-rebuild switch  or  home-manager switch")
+}
+

cmd/version.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"runtime"
 
+	"github.com/fatih/color"
 	"github.com/spf13/cobra"
 )
 
@@ -17,11 +18,25 @@ var versionCmd = &cobra.Command{
 	Use:   "version",
 	Short: "Show version/build info",
 	Run: func(cmd *cobra.Command, args []string) {
-		fmt.Printf("snitch %s\n", Version)
-		fmt.Printf("  commit: %s\n", Commit)
-		fmt.Printf("  built:  %s\n", Date)
-		fmt.Printf("  go:     %s\n", runtime.Version())
-		fmt.Printf("  os:     %s/%s\n", runtime.GOOS, runtime.GOARCH)
+		bold := color.New(color.Bold)
+		cyan := color.New(color.FgCyan)
+		faint := color.New(color.Faint)
+
+		bold.Print("snitch ")
+		cyan.Println(Version)
+		fmt.Println()
+
+		faint.Print("  commit  ")
+		fmt.Println(Commit)
+
+		faint.Print("  built   ")
+		fmt.Println(Date)
+
+		faint.Print("  go      ")
+		fmt.Println(runtime.Version())
+
+		faint.Print("  os      ")
+		fmt.Printf("%s/%s\n", runtime.GOOS, runtime.GOARCH)
 	},
 }
 

flake.lock

@@ -2,39 +2,23 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1765687488,
-        "narHash": "sha256-7YAJ6xgBAQ/Nr+7MI13Tui1ULflgAdKh63m1tfYV7+M=",
+        "lastModified": 1766201043,
+        "narHash": "sha256-eplAP+rorKKd0gNjV3rA6+0WMzb1X1i16F5m5pASnjA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d02bcc33948ca19b0aaa0213fe987ceec1f4ebe1",
+        "rev": "b3aad468604d3e488d627c0b43984eb60e75e782",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-25.05",
+        "ref": "nixos-25.11",
         "repo": "nixpkgs",
         "type": "github"
       }
     },
     "root": {
       "inputs": {
-        "nixpkgs": "nixpkgs",
-        "systems": "systems"
-      }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
+        "nixpkgs": "nixpkgs"
       }
     }
   },

flake.nix

@@ -1,107 +1,110 @@
 {
   description = "snitch - a friendlier ss/netstat for humans";
 
-  inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
-    systems.url = "github:nix-systems/default";
-  };
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
 
-  outputs = { self, nixpkgs, systems }:
+  outputs = { self, nixpkgs }:
     let
-      supportedSystems = import systems;
-      forAllSystems = f: nixpkgs.lib.genAttrs supportedSystems (system: f system);
+      systems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      eachSystem = nixpkgs.lib.genAttrs systems;
 
-      # go 1.25 overlay (required until nixpkgs has it)
-      goOverlay = final: prev:
+      # go 1.25 binary derivation (required until nixpkgs ships it)
+      mkGo125 = pkgs:
         let
           version = "1.25.0";
-          platformInfo = {
-            "x86_64-linux" = { suffix = "linux-amd64"; sri = "sha256-KFKvDLIKExObNEiZLmm4aOUO0Pih5ZQO4d6eGaEjthM="; };
-            "aarch64-linux" = { suffix = "linux-arm64"; sri = "sha256-Bd511plKJ4NpmBXuVTvVqTJ9i3mZHeNuOLZoYngvVK4="; };
-            "x86_64-darwin" = { suffix = "darwin-amd64"; sri = "sha256-W9YOgjA3BiwjB8cegRGAmGURZxTW9rQQWXz1B139gO8="; };
-            "aarch64-darwin" = { suffix = "darwin-arm64"; sri = "sha256-VEkyhEFW2Bcveij3fyrJwVojBGaYtiQ/YzsKCwDAdJw="; };
-          };
-          hostSystem = prev.stdenv.hostPlatform.system;
-          chosen = platformInfo.${hostSystem} or (throw "unsupported system: ${hostSystem}");
+          platform = {
+            "x86_64-linux" = { suffix = "linux-amd64"; hash = "sha256-KFKvDLIKExObNEiZLmm4aOUO0Pih5ZQO4d6eGaEjthM="; GOOS = "linux"; GOARCH = "amd64"; };
+            "aarch64-linux" = { suffix = "linux-arm64"; hash = "sha256-Bd511plKJ4NpmBXuVTvVqTJ9i3mZHeNuOLZoYngvVK4="; GOOS = "linux"; GOARCH = "arm64"; };
+            "x86_64-darwin" = { suffix = "darwin-amd64"; hash = "sha256-W9YOgjA3BiwjB8cegRGAmGURZxTW9rQQWXz1B139gO8="; GOOS = "darwin"; GOARCH = "amd64"; };
+            "aarch64-darwin" = { suffix = "darwin-arm64"; hash = "sha256-VEkyhEFW2Bcveij3fyrJwVojBGaYtiQ/YzsKCwDAdJw="; GOOS = "darwin"; GOARCH = "arm64"; };
+          }.${pkgs.stdenv.hostPlatform.system} or (throw "unsupported system: ${pkgs.stdenv.hostPlatform.system}");
         in
-        {
-          go_1_25 = prev.stdenvNoCC.mkDerivation {
-            pname = "go";
-            inherit version;
-            src = prev.fetchurl {
-              url = "https://go.dev/dl/go${version}.${chosen.suffix}.tar.gz";
-              hash = chosen.sri;
-            };
-            dontBuild = true;
-            installPhase = ''
-              runHook preInstall
-              mkdir -p "$out"/{bin,share}
-              tar -C "$TMPDIR" -xzf "$src"
-              cp -a "$TMPDIR/go" "$out/share/go"
-              ln -s "$out/share/go/bin/go" "$out/bin/go"
-              ln -s "$out/share/go/bin/gofmt" "$out/bin/gofmt"
-              runHook postInstall
-            '';
-            dontPatchELF = true;
-            dontStrip = true;
+        pkgs.stdenv.mkDerivation {
+          pname = "go";
+          inherit version;
+          src = pkgs.fetchurl {
+            url = "https://go.dev/dl/go${version}.${platform.suffix}.tar.gz";
+            inherit (platform) hash;
+          };
+          dontBuild = true;
+          dontPatchELF = true;
+          dontStrip = true;
+          installPhase = ''
+            runHook preInstall
+            mkdir -p $out/{bin,share/go}
+            tar -xzf $src --strip-components=1 -C $out/share/go
+            ln -s $out/share/go/bin/go $out/bin/go
+            ln -s $out/share/go/bin/gofmt $out/bin/gofmt
+            runHook postInstall
+          '';
+          passthru = {
+            inherit (platform) GOOS GOARCH;
+          };
+        };
+
+      pkgsFor = system: import nixpkgs { inherit system; };
+
+      mkSnitch = pkgs:
+        let
+          rev = self.shortRev or self.dirtyShortRev or "unknown";
+          version = "nix-${rev}";
+          isDarwin = pkgs.stdenv.isDarwin;
+          go = mkGo125 pkgs;
+          buildGoModule = pkgs.buildGoModule.override { inherit go; };
+        in
+        buildGoModule {
+          pname = "snitch";
+          inherit version;
+          src = self;
+          vendorHash = "sha256-fX3wOqeOgjH7AuWGxPQxJ+wbhp240CW8tiF4rVUUDzk=";
+          # darwin requires cgo for libproc, linux uses pure go with /proc
+          env.CGO_ENABLED = if isDarwin then "1" else "0";
+          env.GOTOOLCHAIN = "local";
+          # darwin: use macOS 15 SDK for SecTrustCopyCertificateChain (Go 1.25 crypto/x509)
+          buildInputs = pkgs.lib.optionals isDarwin [ pkgs.apple-sdk_15 ];
+          ldflags = [
+            "-s"
+            "-w"
+            "-X snitch/cmd.Version=${version}"
+            "-X snitch/cmd.Commit=${rev}"
+            "-X snitch/cmd.Date=${self.lastModifiedDate or "unknown"}"
+          ];
+          meta = {
+            description = "a friendlier ss/netstat for humans";
+            homepage = "https://github.com/karol-broda/snitch";
+            license = pkgs.lib.licenses.mit;
+            platforms = pkgs.lib.platforms.linux ++ pkgs.lib.platforms.darwin;
+            mainProgram = "snitch";
           };
         };
     in
     {
-      overlays.default = final: prev: {
-        snitch = final.callPackage ./nix/package.nix { };
-      };
-
-      packages = forAllSystems (system:
-        let
-          pkgs = import nixpkgs {
-            inherit system;
-            overlays = [ goOverlay ];
-          };
-        in
-        let
-          version = self.shortRev or self.dirtyShortRev or "dev";
-        in
+      packages = eachSystem (system:
+        let pkgs = pkgsFor system; in
         {
-          default = pkgs.buildGoModule {
-            pname = "snitch";
-            inherit version;
-            src = self;
-            vendorHash = "sha256-fX3wOqeOgjH7AuWGxPQxJ+wbhp240CW8tiF4rVUUDzk=";
-            env.CGO_ENABLED = 0;
-            ldflags = [
-              "-s" "-w"
-              "-X snitch/cmd.Version=${version}"
-              "-X snitch/cmd.Commit=${version}"
-              "-X snitch/cmd.Date=${self.lastModifiedDate or "unknown"}"
-            ];
-            meta = with pkgs.lib; {
-              description = "a friendlier ss/netstat for humans";
-              homepage = "https://github.com/karol-broda/snitch";
-              license = licenses.mit;
-              platforms = platforms.linux;
-              mainProgram = "snitch";
-            };
-          };
+          default = mkSnitch pkgs;
+          snitch = mkSnitch pkgs;
         }
       );
 
-      devShells = forAllSystems (system:
+      devShells = eachSystem (system:
         let
-          pkgs = import nixpkgs {
-            inherit system;
-            overlays = [ goOverlay ];
-          };
+          pkgs = pkgsFor system;
+          go = mkGo125 pkgs;
         in
         {
           default = pkgs.mkShell {
-            packages = [ pkgs.go_1_25 pkgs.git pkgs.vhs ];
-            GOTOOLCHAIN = "local";
+            packages = [ go pkgs.git pkgs.vhs ];
+            env.GOTOOLCHAIN = "local";
             shellHook = ''
               echo "go toolchain: $(go version)"
             '';
           };
         }
       );
+
+      overlays.default = final: _prev: {
+        snitch = mkSnitch final;
+      };
     };
 }

go.mod

@@ -1,4 +1,4 @@
-module snitch
+module github.com/karol-broda/snitch
 
 go 1.24.0
 

install.sh

@@ -0,0 +1,113 @@
+#!/bin/sh
+set -e
+
+REPO="karol-broda/snitch"
+BINARY_NAME="snitch"
+
+# allow override via environment
+INSTALL_DIR="${INSTALL_DIR:-}"
+KEEP_QUARANTINE="${KEEP_QUARANTINE:-}"
+
+detect_install_dir() {
+    if [ -n "$INSTALL_DIR" ]; then
+        echo "$INSTALL_DIR"
+        return
+    fi
+
+    # prefer user-local directory if it exists and is in PATH
+    if [ -d "$HOME/.local/bin" ] && echo "$PATH" | grep -q "$HOME/.local/bin"; then
+        echo "$HOME/.local/bin"
+        return
+    fi
+
+    # fallback to /usr/local/bin
+    echo "/usr/local/bin"
+}
+
+detect_os() {
+    os=$(uname -s | tr '[:upper:]' '[:lower:]')
+    case "$os" in
+        darwin) echo "darwin" ;;
+        linux) echo "linux" ;;
+        *)
+            echo "error: unsupported operating system: $os" >&2
+            exit 1
+            ;;
+    esac
+}
+
+detect_arch() {
+    arch=$(uname -m)
+    case "$arch" in
+        x86_64|amd64) echo "amd64" ;;
+        aarch64|arm64) echo "arm64" ;;
+        armv7l) echo "armv7" ;;
+        *)
+            echo "error: unsupported architecture: $arch" >&2
+            exit 1
+            ;;
+    esac
+}
+
+fetch_latest_version() {
+    version=$(curl -sL "https://api.github.com/repos/${REPO}/releases/latest" | grep '"tag_name"' | head -1 | cut -d'"' -f4)
+    if [ -z "$version" ]; then
+        echo "error: failed to fetch latest version" >&2
+        exit 1
+    fi
+    echo "$version"
+}
+
+main() {
+    os=$(detect_os)
+    arch=$(detect_arch)
+    install_dir=$(detect_install_dir)
+    version=$(fetch_latest_version)
+    version_no_v="${version#v}"
+
+    archive_name="${BINARY_NAME}_${version_no_v}_${os}_${arch}.tar.gz"
+    download_url="https://github.com/${REPO}/releases/download/${version}/${archive_name}"
+
+    echo "installing ${BINARY_NAME} ${version} for ${os}/${arch}..."
+
+    tmp_dir=$(mktemp -d)
+    trap 'rm -rf "$tmp_dir"' EXIT
+
+    echo "downloading ${download_url}..."
+    if ! curl -sL --fail "$download_url" -o "${tmp_dir}/${archive_name}"; then
+        echo "error: failed to download ${download_url}" >&2
+        exit 1
+    fi
+
+    echo "extracting..."
+    tar -xzf "${tmp_dir}/${archive_name}" -C "$tmp_dir"
+
+    if [ ! -f "${tmp_dir}/${BINARY_NAME}" ]; then
+        echo "error: binary not found in archive" >&2
+        exit 1
+    fi
+
+    # remove macos quarantine attribute unless disabled
+    if [ "$os" = "darwin" ] && [ -z "$KEEP_QUARANTINE" ]; then
+        if xattr -d com.apple.quarantine "${tmp_dir}/${BINARY_NAME}" 2>/dev/null; then
+            echo "warning: removed macOS quarantine attribute from binary"
+        fi
+    fi
+
+    # install binary
+    if [ -w "$install_dir" ]; then
+        mv "${tmp_dir}/${BINARY_NAME}" "${install_dir}/${BINARY_NAME}"
+    else
+        echo "elevated permissions required to install to ${install_dir}"
+        sudo mv "${tmp_dir}/${BINARY_NAME}" "${install_dir}/${BINARY_NAME}"
+    fi
+
+    chmod +x "${install_dir}/${BINARY_NAME}"
+
+    echo "installed ${BINARY_NAME} to ${install_dir}/${BINARY_NAME}"
+    echo ""
+    echo "run '${BINARY_NAME} --help' to get started"
+}
+
+main
+

internal/testutil/testutil.go

@@ -5,7 +5,7 @@ import (
 	"path/filepath"
 	"testing"
 
-	"snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/collector"
 )
 
 // TestCollector wraps MockCollector for use in tests

internal/tui/helpers.go

@@ -1,9 +1,8 @@
 package tui
 
 import (
-	"fmt"
 	"regexp"
-	"snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/collector"
 	"strings"
 )
 
@@ -44,10 +43,3 @@ func sortFieldLabel(f collector.SortField) string {
 	}
 }
 
-func formatRemote(addr string, port int) string {
-	if addr == "" || addr == "*" || port == 0 {
-		return "-"
-	}
-	return fmt.Sprintf("%s:%d", addr, port)
-}
-

internal/tui/keys.go

@@ -2,7 +2,7 @@ package tui
 
 import (
 	"fmt"
-	"snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/collector"
 	"time"
 
 	tea "github.com/charmbracelet/bubbletea"
@@ -210,6 +210,28 @@ func (m model) handleNormalKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 				m.showKillConfirm = true
 			}
 		}
+
+	// toggle address resolution
+	case "n":
+		m.resolveAddrs = !m.resolveAddrs
+		if m.resolveAddrs {
+			m.statusMessage = "address resolution: on"
+		} else {
+			m.statusMessage = "address resolution: off"
+		}
+		m.statusExpiry = time.Now().Add(2 * time.Second)
+		return m, clearStatusAfter(2 * time.Second)
+
+	// toggle port resolution
+	case "N":
+		m.resolvePorts = !m.resolvePorts
+		if m.resolvePorts {
+			m.statusMessage = "port resolution: on"
+		} else {
+			m.statusMessage = "port resolution: off"
+		}
+		m.statusExpiry = time.Now().Add(2 * time.Second)
+		return m, clearStatusAfter(2 * time.Second)
 	}
 
 	return m, nil

internal/tui/messages.go

@@ -2,7 +2,7 @@ package tui
 
 import (
 	"fmt"
-	"snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/collector"
 	"syscall"
 	"time"
 

internal/tui/model.go

@@ -2,8 +2,8 @@ package tui
 
 import (
 	"fmt"
-	"snitch/internal/collector"
-	"snitch/internal/theme"
+	"github.com/karol-broda/snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/theme"
 	"time"
 
 	tea "github.com/charmbracelet/bubbletea"
@@ -28,6 +28,10 @@ type model struct {
 	sortField   collector.SortField
 	sortReverse bool
 
+	// display options
+	resolveAddrs bool // when true, resolve IP addresses to hostnames
+	resolvePorts bool // when true, resolve port numbers to service names
+
 	// ui state
 	theme       *theme.Theme
 	showHelp    bool
@@ -50,14 +54,16 @@ type model struct {
 }
 
 type Options struct {
-	Theme       string
-	Interval    time.Duration
-	TCP         bool
-	UDP         bool
-	Listening   bool
-	Established bool
-	Other       bool
-	FilterSet   bool // true if user specified any filter flags
+	Theme        string
+	Interval     time.Duration
+	TCP          bool
+	UDP          bool
+	Listening    bool
+	Established  bool
+	Other        bool
+	FilterSet    bool // true if user specified any filter flags
+	ResolveAddrs bool // when true, resolve IP addresses to hostnames
+	ResolvePorts bool // when true, resolve port numbers to service names
 }
 
 func New(opts Options) model {
@@ -102,6 +108,8 @@ func New(opts Options) model {
 		showEstablished: showEstablished,
 		showOther:       showOther,
 		sortField:       collector.SortByLport,
+		resolveAddrs:    opts.ResolveAddrs,
+		resolvePorts:    opts.ResolvePorts,
 		theme:           theme.GetTheme(opts.Theme),
 		interval:        interval,
 		lastRefresh:     time.Now(),

internal/tui/model_test.go

@@ -1,7 +1,7 @@
 package tui
 
 import (
-	"snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/collector"
 	"testing"
 	"time"
 
@@ -301,3 +301,132 @@ func TestTUI_ViewRenders(t *testing.T) {
 	}
 }
 
+func TestTUI_ResolutionOptions(t *testing.T) {
+	// test default resolution settings
+	m := New(Options{Theme: "dark", Interval: time.Hour})
+
+	if m.resolveAddrs != false {
+		t.Error("expected resolveAddrs to be false by default (must be explicitly set)")
+	}
+	if m.resolvePorts != false {
+		t.Error("expected resolvePorts to be false by default")
+	}
+
+	// test with explicit options
+	m2 := New(Options{
+		Theme:        "dark",
+		Interval:     time.Hour,
+		ResolveAddrs: true,
+		ResolvePorts: true,
+	})
+
+	if m2.resolveAddrs != true {
+		t.Error("expected resolveAddrs to be true when set")
+	}
+	if m2.resolvePorts != true {
+		t.Error("expected resolvePorts to be true when set")
+	}
+}
+
+func TestTUI_ToggleResolution(t *testing.T) {
+	m := New(Options{Theme: "dark", Interval: time.Hour, ResolveAddrs: true})
+
+	if m.resolveAddrs != true {
+		t.Fatal("expected resolveAddrs to be true initially")
+	}
+
+	// toggle address resolution with 'n'
+	newModel, _ := m.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'n'}})
+	m = newModel.(model)
+
+	if m.resolveAddrs != false {
+		t.Error("expected resolveAddrs to be false after toggle")
+	}
+
+	// toggle back
+	newModel, _ = m.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'n'}})
+	m = newModel.(model)
+
+	if m.resolveAddrs != true {
+		t.Error("expected resolveAddrs to be true after second toggle")
+	}
+
+	// toggle port resolution with 'N'
+	if m.resolvePorts != false {
+		t.Fatal("expected resolvePorts to be false initially")
+	}
+
+	newModel, _ = m.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'N'}})
+	m = newModel.(model)
+
+	if m.resolvePorts != true {
+		t.Error("expected resolvePorts to be true after toggle")
+	}
+
+	// toggle back
+	newModel, _ = m.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'N'}})
+	m = newModel.(model)
+
+	if m.resolvePorts != false {
+		t.Error("expected resolvePorts to be false after second toggle")
+	}
+}
+
+func TestTUI_ResolveAddrHelper(t *testing.T) {
+	m := New(Options{Theme: "dark", Interval: time.Hour})
+	m.resolveAddrs = false
+
+	// when resolution is off, should return original address
+	addr := m.resolveAddr("192.168.1.1")
+	if addr != "192.168.1.1" {
+		t.Errorf("expected original address when resolution off, got %s", addr)
+	}
+
+	// empty and wildcard addresses should pass through unchanged
+	if m.resolveAddr("") != "" {
+		t.Error("expected empty string to pass through")
+	}
+	if m.resolveAddr("*") != "*" {
+		t.Error("expected wildcard to pass through")
+	}
+}
+
+func TestTUI_ResolvePortHelper(t *testing.T) {
+	m := New(Options{Theme: "dark", Interval: time.Hour})
+	m.resolvePorts = false
+
+	// when resolution is off, should return port number as string
+	port := m.resolvePort(80, "tcp")
+	if port != "80" {
+		t.Errorf("expected '80' when resolution off, got %s", port)
+	}
+
+	port = m.resolvePort(443, "tcp")
+	if port != "443" {
+		t.Errorf("expected '443' when resolution off, got %s", port)
+	}
+}
+
+func TestTUI_FormatRemoteHelper(t *testing.T) {
+	m := New(Options{Theme: "dark", Interval: time.Hour})
+	m.resolveAddrs = false
+	m.resolvePorts = false
+
+	// empty/wildcard addresses should return dash
+	if m.formatRemote("", 80, "tcp") != "-" {
+		t.Error("expected dash for empty address")
+	}
+	if m.formatRemote("*", 80, "tcp") != "-" {
+		t.Error("expected dash for wildcard address")
+	}
+	if m.formatRemote("192.168.1.1", 0, "tcp") != "-" {
+		t.Error("expected dash for zero port")
+	}
+
+	// valid address:port should format correctly
+	result := m.formatRemote("192.168.1.1", 443, "tcp")
+	if result != "192.168.1.1:443" {
+		t.Errorf("expected '192.168.1.1:443', got %s", result)
+	}
+}
+

internal/tui/symbols.go

@@ -15,6 +15,7 @@ const (
 	SymbolArrowDown  = string('\u2193') // downwards arrow
 	SymbolRefresh    = string('\u21BB') // clockwise open circle arrow
 	SymbolEllipsis   = string('\u2026') // horizontal ellipsis
+	SymbolDownload   = string('\u21E9') // downwards white arrow
 
 	// box drawing rounded 
 	BoxTopLeft     = string('\u256D') // light arc down and right

internal/tui/view.go

@@ -2,7 +2,9 @@ package tui
 
 import (
 	"fmt"
-	"snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/collector"
+	"github.com/karol-broda/snitch/internal/resolver"
+	"strconv"
 	"strings"
 	"time"
 
@@ -47,37 +49,14 @@ func (m model) renderTitle() string {
 func (m model) renderFilters() string {
 	var parts []string
 
-	if m.showTCP {
-		parts = append(parts, m.theme.Styles.Success.Render("tcp"))
-	} else {
-		parts = append(parts, m.theme.Styles.Normal.Render("tcp"))
-	}
-
-	if m.showUDP {
-		parts = append(parts, m.theme.Styles.Success.Render("udp"))
-	} else {
-		parts = append(parts, m.theme.Styles.Normal.Render("udp"))
-	}
+	parts = append(parts, m.renderFilterLabel("t", "cp", m.showTCP))
+	parts = append(parts, m.renderFilterLabel("u", "dp", m.showUDP))
 
 	parts = append(parts, m.theme.Styles.Border.Render(BoxVertical))
 
-	if m.showListening {
-		parts = append(parts, m.theme.Styles.Success.Render("listen"))
-	} else {
-		parts = append(parts, m.theme.Styles.Normal.Render("listen"))
-	}
-
-	if m.showEstablished {
-		parts = append(parts, m.theme.Styles.Success.Render("estab"))
-	} else {
-		parts = append(parts, m.theme.Styles.Normal.Render("estab"))
-	}
-
-	if m.showOther {
-		parts = append(parts, m.theme.Styles.Success.Render("other"))
-	} else {
-		parts = append(parts, m.theme.Styles.Normal.Render("other"))
-	}
+	parts = append(parts, m.renderFilterLabel("l", "isten", m.showListening))
+	parts = append(parts, m.renderFilterLabel("e", "stab", m.showEstablished))
+	parts = append(parts, m.renderFilterLabel("o", "ther", m.showOther))
 
 	left := "  " + strings.Join(parts, "  ")
 
@@ -119,6 +98,18 @@ func (m model) renderTableHeader() string {
 	return m.theme.Styles.Header.Render(header) + "\n"
 }
 
+func (m model) renderFilterLabel(firstChar, rest string, active bool) string {
+	baseStyle := m.theme.Styles.Normal
+	if active {
+		baseStyle = m.theme.Styles.Success
+	}
+
+	underlinedFirst := baseStyle.Underline(true).Render(firstChar)
+	restPart := baseStyle.Render(rest)
+
+	return underlinedFirst + restPart
+}
+
 func (m model) renderSeparator() string {
 	w := m.width - 4
 	if w < 1 {
@@ -134,8 +125,11 @@ func (m model) renderConnections() string {
 	pageSize := m.pageSize()
 
 	if len(visible) == 0 {
-		empty := "\n  " + m.theme.Styles.Normal.Render("no connections match filters") + "\n"
-		return empty
+		b.WriteString("  " + m.theme.Styles.Normal.Render("no connections match filters") + "\n")
+		for i := 1; i < pageSize; i++ {
+			b.WriteString("\n")
+		}
+		return b.String()
 	}
 
 	start := m.scrollOffset(pageSize, len(visible))
@@ -169,19 +163,19 @@ func (m model) renderRow(c collector.Connection, selected bool) string {
 		process = SymbolDash
 	}
 
-	port := fmt.Sprintf("%d", c.Lport)
+	port := truncate(m.resolvePort(c.Lport, c.Proto), cols.port)
 	proto := c.Proto
 	state := c.State
 	if state == "" {
 		state = SymbolDash
 	}
 
-	local := c.Laddr
+	local := truncate(m.resolveAddr(c.Laddr), cols.local)
 	if local == "*" || local == "" {
 		local = "*"
 	}
 
-	remote := formatRemote(c.Raddr, c.Rport)
+	remote := truncate(m.formatRemote(c.Raddr, c.Rport, c.Proto), cols.remote)
 
 	// apply styling
 	protoStyled := m.theme.Styles.GetProtoStyle(proto).Render(fmt.Sprintf("%-*s", cols.proto, proto))
@@ -193,8 +187,8 @@ func (m model) renderRow(c collector.Connection, selected bool) string {
 		cols.port, port,
 		protoStyled,
 		stateStyled,
-		cols.local, truncate(local, cols.local),
-		truncate(remote, cols.remote))
+		cols.local, local,
+		remote)
 
 	if selected {
 		return m.theme.Styles.Selected.Render(row) + "\n"
@@ -209,7 +203,7 @@ func (m model) renderStatusLine() string {
 		return "  " + m.theme.Styles.Warning.Render(m.statusMessage)
 	}
 
-	left := "  " + m.theme.Styles.Normal.Render("t/u proto  l/e/o state  w watch  K kill  s sort  / search  ? help  q quit")
+	left := "  " + m.theme.Styles.Normal.Render("t/u proto  l/e/o state  n/N dns  w watch  K kill  s sort  / search  ? help  q quit")
 
 	// show watched count if any
 	if m.watchedCount() > 0 {
@@ -217,6 +211,21 @@ func (m model) renderStatusLine() string {
 		left += m.theme.Styles.Watched.Render(watchedInfo)
 	}
 
+	// show dns resolution status
+	var resolveStatus string
+	if m.resolveAddrs && m.resolvePorts {
+		resolveStatus = "all"
+	} else if m.resolveAddrs {
+		resolveStatus = "addrs"
+	} else if m.resolvePorts {
+		resolveStatus = "ports"
+	} else {
+		resolveStatus = "off"
+	}
+	if resolveStatus != "addrs" { // addrs is the default, don't show
+		left += m.theme.Styles.Normal.Render(fmt.Sprintf("  dns: %s", resolveStatus))
+	}
+
 	return left
 }
 
@@ -248,6 +257,11 @@ func (m model) renderHelp() string {
   s            cycle sort field
   S            reverse sort order
 
+  display
+  ───────
+  n            toggle address resolution (dns)
+  N            toggle port resolution (service names)
+
   process management
   ──────────────────
   w            watch/unwatch process (highlight & track)
@@ -277,6 +291,11 @@ func (m model) renderDetail() string {
 	b.WriteString("  " + m.theme.Styles.Header.Render("connection details") + "\n")
 	b.WriteString("  " + m.theme.Styles.Border.Render(strings.Repeat(BoxHorizontal, 40)) + "\n\n")
 
+	localAddr := m.resolveAddr(c.Laddr)
+	localPort := m.resolvePort(c.Lport, c.Proto)
+	remoteAddr := m.resolveAddr(c.Raddr)
+	remotePort := m.resolvePort(c.Rport, c.Proto)
+
 	fields := []struct {
 		label string
 		value string
@@ -286,8 +305,8 @@ func (m model) renderDetail() string {
 		{"user", c.User},
 		{"protocol", c.Proto},
 		{"state", c.State},
-		{"local", fmt.Sprintf("%s:%d", c.Laddr, c.Lport)},
-		{"remote", fmt.Sprintf("%s:%d", c.Raddr, c.Rport)},
+		{"local", fmt.Sprintf("%s:%s", localAddr, localPort)},
+		{"remote", fmt.Sprintf("%s:%s", remoteAddr, remotePort)},
 		{"interface", c.Interface},
 		{"inode", fmt.Sprintf("%d", c.Inode)},
 	}
@@ -506,23 +525,72 @@ type columns struct {
 }
 
 func (m model) columnWidths() columns {
-	available := m.safeWidth() - 16
-
+	// minimum widths (header lengths + padding)
 	c := columns{
-		process: 16,
-		port:    6,
-		proto:   5,
-		state:   11,
-		local:   15,
-		remote:  20,
+		process: 7,  // "PROCESS"
+		port:    4,  // "PORT"
+		proto:   5,  // "PROTO"
+		state:   5,  // "STATE"
+		local:   5,  // "LOCAL"
+		remote:  6,  // "REMOTE"
 	}
 
-	used := c.process + c.port + c.proto + c.state + c.local + c.remote
-	extra := available - used
+	// scan visible connections to find max content width for each column
+	visible := m.visibleConnections()
+	for _, conn := range visible {
+		if len(conn.Process) > c.process {
+			c.process = len(conn.Process)
+		}
 
-	if extra > 0 {
-		c.process += extra / 3
-		c.remote += extra - extra/3
+		port := m.resolvePort(conn.Lport, conn.Proto)
+		if len(port) > c.port {
+			c.port = len(port)
+		}
+
+		if len(conn.Proto) > c.proto {
+			c.proto = len(conn.Proto)
+		}
+
+		if len(conn.State) > c.state {
+			c.state = len(conn.State)
+		}
+
+		local := m.resolveAddr(conn.Laddr)
+		if len(local) > c.local {
+			c.local = len(local)
+		}
+
+		remote := m.formatRemote(conn.Raddr, conn.Rport, conn.Proto)
+		if len(remote) > c.remote {
+			c.remote = len(remote)
+		}
+	}
+
+	// calculate total and available width
+	spacing := 12 // 2 spaces between each of 6 columns
+	indicator := 2
+	margin := 2
+	available := m.safeWidth() - spacing - indicator - margin
+
+	total := c.process + c.port + c.proto + c.state + c.local + c.remote
+
+	// if content fits, we're done
+	if total <= available {
+		return c
+	}
+
+	// content exceeds available space - need to shrink columns proportionally
+	// fixed columns that shouldn't shrink much: port, proto, state
+	fixedWidth := c.port + c.proto + c.state
+	flexibleAvailable := available - fixedWidth
+
+	// distribute flexible space between process, local, remote
+	flexibleTotal := c.process + c.local + c.remote
+	if flexibleTotal > 0 && flexibleAvailable > 0 {
+		ratio := float64(flexibleAvailable) / float64(flexibleTotal)
+		c.process = max(7, int(float64(c.process)*ratio))
+		c.local = max(5, int(float64(c.local)*ratio))
+		c.remote = max(6, int(float64(c.remote)*ratio))
 	}
 
 	return c
@@ -544,3 +612,29 @@ func formatDuration(d time.Duration) string {
 	}
 	return fmt.Sprintf("%.0fm", d.Minutes())
 }
+
+func (m model) resolveAddr(addr string) string {
+	if !m.resolveAddrs {
+		return addr
+	}
+	if addr == "" || addr == "*" {
+		return addr
+	}
+	return resolver.ResolveAddr(addr)
+}
+
+func (m model) resolvePort(port int, proto string) string {
+	if !m.resolvePorts {
+		return strconv.Itoa(port)
+	}
+	return resolver.ResolvePort(port, proto)
+}
+
+func (m model) formatRemote(addr string, port int, proto string) string {
+	if addr == "" || addr == "*" || port == 0 {
+		return "-"
+	}
+	resolvedAddr := m.resolveAddr(addr)
+	resolvedPort := m.resolvePort(port, proto)
+	return fmt.Sprintf("%s:%s", resolvedAddr, resolvedPort)
+}

main.go

@@ -1,7 +1,7 @@
 package main
 
 import (
-	"snitch/cmd"
+	"github.com/karol-broda/snitch/cmd"
 )
 
 func main() {