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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
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Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
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`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.

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// This file is part of checker-dnsviz.
//
// checker-dnsviz is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, version 2.
//
// checker-dnsviz is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// checker-dnsviz. If not, see <https://www.gnu.org/licenses/>.
//
// SPDX-License-Identifier: GPL-2.0-only
// Package collect contains the DNSViz subprocess invocation. It is kept
// separate from the checker package so that the checker package (pure analysis
// logic) can be imported under MIT terms without pulling in GPL-covered code.
package collect
import (
"bytes"
"context"
"fmt"
"os"
"os/exec"
"strings"
"time"
"unicode/utf8"
checker "git.happydns.org/checker-dnsviz/checker"
sdk "git.happydns.org/checker-sdk-go/checker"
)
// defaultTrustAnchorsFile is the BIND-formatted root DNSKEY trust anchor file
// shipped by Alpine's `dnssec-root` package (installed in our Docker image).
// Passed to `dnsviz grok -t` so the root zone gets classified as SECURE
// instead of staying at the DNS-rcode "NOERROR" fallback.
const defaultTrustAnchorsFile = "/usr/share/dnssec-root/trusted-key.key"
const (
defaultProbeTimeout = 120 * time.Second
maxDNSVizOutputBytes = 16 << 20 // 16 MiB
)
// Collector holds the runtime configuration for DNSViz invocations.
type Collector struct {
// Bin is the path to the dnsviz CLI. Defaults to "dnsviz".
Bin string
// ExtraArgs is a whitespace-separated list of extra arguments appended to
// `dnsviz probe`. Defaults to "-A".
ExtraArgs string
// TrustAnchorsFile is a BIND-format DNSKEY file used as DNSSEC trust
// anchor (passed to `dnsviz grok -t`). When empty, defaultTrustAnchorsFile
// is used if it exists; otherwise grok runs without `-t` and the root
// zone falls back to a NOERROR classification.
TrustAnchorsFile string
}
// Collect runs `dnsviz probe | dnsviz grok` against the domain named in opts
// and returns the structured analysis as a *checker.DNSVizData.
func (c *Collector) Collect(ctx context.Context, opts sdk.CheckerOptions) (any, error) {
domain, _ := sdk.GetOption[string](opts, "domain_name")
domain = strings.TrimSpace(strings.TrimSuffix(domain, "."))
if domain == "" {
return nil, fmt.Errorf("missing 'domain_name' option")
}
if !isValidDomainName(domain) {
return nil, fmt.Errorf("invalid 'domain_name' option")
}
timeout := defaultProbeTimeout
if n := sdk.GetIntOption(opts, "probeTimeoutSeconds", 0); n > 0 {
timeout = time.Duration(n) * time.Second
}
bin := strings.TrimSpace(c.Bin)
if bin == "" {
bin = "dnsviz"
}
extraArgs := c.ExtraArgs
if extraArgs == "" {
extraArgs = "-A"
}
probeCtx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
// Probe the queried name AND every ancestor up to the root. dnsviz only
// emits a full analysis (DNSKEY set, DS at parent, queries…) for names
// passed on the command line: ancestors probed implicitly are kept as
// "stub" entries that grok ignores. Listing them explicitly is what
// makes the chain (root, TLD, intermediates, leaf) appear in the grok
// output, and therefore in the report.
names := ancestorNames(domain)
probeOut, probeErr, err := runProbe(probeCtx, bin, names, extraArgs)
if err != nil {
return nil, fmt.Errorf("dnsviz probe failed: %w (stderr: %s)", err, truncate(probeErr, 4096))
}
grokCtx, cancelGrok := context.WithTimeout(ctx, timeout)
defer cancelGrok()
trustAnchors := c.TrustAnchorsFile
if trustAnchors == "" {
if _, err := os.Stat(defaultTrustAnchorsFile); err == nil {
trustAnchors = defaultTrustAnchorsFile
}
}
grokOut, grokErr, err := runGrok(grokCtx, bin, probeOut, trustAnchors)
if err != nil {
return nil, fmt.Errorf("dnsviz grok failed: %w (stderr: %s)", err, truncate(grokErr, 4096))
}
zones, order, err := checker.ParseGrokOutput(grokOut)
if err != nil {
return nil, fmt.Errorf("decoding dnsviz grok output: %w", err)
}
return &checker.DNSVizData{
Domain: domain,
Zones: zones,
Order: order,
Raw: grokOut,
ProbeStderr: probeErr,
GrokStderr: grokErr,
}, nil
}
func runProbe(ctx context.Context, bin string, names []string, extraArgs string) ([]byte, string, error) {
args := []string{"probe"}
args = append(args, strings.Fields(extraArgs)...)
args = append(args, "--")
args = append(args, names...)
cmd := exec.CommandContext(ctx, bin, args...)
var stdout, stderr bytes.Buffer
cmd.Stdout = &capLimit{B: &stdout, max: maxDNSVizOutputBytes}
cmd.Stderr = &capLimit{B: &stderr, max: maxDNSVizOutputBytes}
if err := cmd.Run(); err != nil {
return stdout.Bytes(), stderr.String(), err
}
return stdout.Bytes(), stderr.String(), nil
}
func runGrok(ctx context.Context, bin string, probeJSON []byte, trustAnchorsFile string) ([]byte, string, error) {
args := []string{"grok"}
if trustAnchorsFile != "" {
args = append(args, "-t", trustAnchorsFile)
}
cmd := exec.CommandContext(ctx, bin, args...)
cmd.Stdin = bytes.NewReader(probeJSON)
var stdout, stderr bytes.Buffer
cmd.Stdout = &capLimit{B: &stdout, max: maxDNSVizOutputBytes}
cmd.Stderr = &capLimit{B: &stderr, max: maxDNSVizOutputBytes}
if err := cmd.Run(); err != nil {
return stdout.Bytes(), stderr.String(), err
}
return stdout.Bytes(), stderr.String(), nil
}
// ancestorNames returns the root, each parent label suffix, and finally
// the queried name itself, all in trailing-dot form. For
// "sub.example.com" the result is [".", "com.", "example.com.",
// "sub.example.com."]. The order matters: dnsviz probes names in the
// order they're given and creates a "stub" entry for each ancestor
// referenced by a previously-seen name, so listing root → leaf is the
// only ordering that yields a fully-analyzed entry for every ancestor
// in the grok output. dnsviz tolerates non-zone names on the command
// line (the analysis attaches to the enclosing zone), so we don't need
// to pre-compute the real zone cuts.
func ancestorNames(domain string) []string {
domain = strings.TrimSuffix(domain, ".")
if domain == "" {
return []string{"."}
}
rev := []string{domain + "."}
for {
i := strings.Index(domain, ".")
if i < 0 {
break
}
domain = domain[i+1:]
rev = append(rev, domain+".")
}
rev = append(rev, ".")
// Reverse to root → leaf.
out := make([]string, len(rev))
for i, n := range rev {
out[len(rev)-1-i] = n
}
return out
}
func isValidDomainName(s string) bool {
if s == "" || len(s) > 253 || s[0] == '-' || s[0] == '.' {
return false
}
for i := 0; i < len(s); i++ {
c := s[i]
switch {
case c >= 'a' && c <= 'z':
case c >= 'A' && c <= 'Z':
case c >= '0' && c <= '9':
case c == '-' || c == '.' || c == '_':
default:
return false
}
}
return true
}
// truncate returns s capped at n bytes, trimming back to a UTF-8 rune
// boundary so the appended ellipsis can't follow a half-encoded codepoint.
func truncate(s string, n int) string {
if len(s) <= n {
return s
}
for n > 0 && !utf8.RuneStart(s[n]) {
n--
}
return s[:n] + "…"
}
// capLimit is an io.Writer that buffers up to max bytes into B and silently
// drops anything beyond the cap. It exists to keep a runaway dnsviz process
// from filling memory while still letting os/exec consume the pipe.
//
// Write deliberately reports len(p) bytes written even when it discarded
// the overflow: returning a "short write" would make os/exec abort the
// child with io.ErrShortWrite, which is not what we want: we want to keep
// reading the rest of the output (and trash it) until the process exits.
// The trade-off is that the returned count lies; callers must not rely on
// it for accounting.
type capLimit struct {
B *bytes.Buffer
max int
}
func (c *capLimit) Write(p []byte) (int, error) {
remaining := c.max - c.B.Len()
if remaining <= 0 {
return len(p), nil
}
if len(p) > remaining {
c.B.Write(p[:remaining])
return len(p), nil
}
return c.B.Write(p)
}

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// SPDX-License-Identifier: GPL-2.0-only
package collect
import (
"bytes"
"context"
"errors"
"os"
"path/filepath"
"runtime"
"strings"
"testing"
"time"
checker "git.happydns.org/checker-dnsviz/checker"
sdk "git.happydns.org/checker-sdk-go/checker"
)
func TestIsValidDomainName(t *testing.T) {
good := []string{
"example.com",
"a",
"sub.domain.example.com",
"_dmarc.example.com",
"xn--bcher-kva.de",
"123.example.com",
}
bad := []string{
"",
"-bad.example",
".bad.example",
"foo bar.example",
"foo;rm -rf.example",
"foo$bar",
"héllo.example",
strings.Repeat("a", 254),
}
for _, s := range good {
if !isValidDomainName(s) {
t.Errorf("expected %q valid", s)
}
}
for _, s := range bad {
if isValidDomainName(s) {
t.Errorf("expected %q invalid", s)
}
}
}
func TestTruncate(t *testing.T) {
if truncate("short", 100) != "short" {
t.Error("short string should pass through")
}
got := truncate("abcdef", 3)
if got != "abc…" {
t.Errorf("truncate=%q", got)
}
}
func TestCapLimit_DropsOverflow(t *testing.T) {
var buf bytes.Buffer
c := &capLimit{B: &buf, max: 4}
n, err := c.Write([]byte("abcdef"))
if err != nil {
t.Fatal(err)
}
if n != 6 {
t.Errorf("Write should report full length to keep os/exec happy, got %d", n)
}
if buf.String() != "abcd" {
t.Errorf("buffer=%q want abcd", buf.String())
}
// A subsequent write while full is silently discarded.
n, _ = c.Write([]byte("g"))
if n != 1 || buf.String() != "abcd" {
t.Errorf("post-cap write: n=%d buf=%q", n, buf.String())
}
}
func TestCollect_MissingDomain(t *testing.T) {
c := &Collector{}
if _, err := c.Collect(context.Background(), sdk.CheckerOptions{}); err == nil {
t.Fatal("expected error for missing domain_name")
}
}
func TestCollect_RejectsInjection(t *testing.T) {
c := &Collector{}
_, err := c.Collect(context.Background(), sdk.CheckerOptions{"domain_name": "-A"})
if err == nil || !strings.Contains(err.Error(), "invalid 'domain_name'") {
t.Errorf("expected invalid domain error, got %v", err)
}
_, err = c.Collect(context.Background(), sdk.CheckerOptions{"domain_name": "foo;rm -rf /"})
if err == nil || !strings.Contains(err.Error(), "invalid 'domain_name'") {
t.Errorf("expected invalid domain error, got %v", err)
}
}
// fakeDNSVizScript writes a small POSIX shell that emulates `dnsviz probe`
// (always emits a fixed JSON) and `dnsviz grok` (emits a canned grok JSON,
// regardless of stdin), so Collect can run end-to-end without the real
// Python tool.
func fakeDNSVizScript(t *testing.T) string {
t.Helper()
if runtime.GOOS == "windows" {
t.Skip("POSIX shell needed for the fake dnsviz")
}
dir := t.TempDir()
path := filepath.Join(dir, "dnsviz")
body := `#!/bin/sh
case "$1" in
probe)
cat <<EOF
{"_meta":{"phase":"probe"}}
EOF
;;
grok)
cat <<EOF
{
"example.com.": {
"status": "NOERROR",
"delegation": {"status": "SECURE"}
},
"com.": {"delegation": {"status": "SECURE"}}
}
EOF
;;
failprobe)
echo "boom" 1>&2
exit 7
;;
esac
`
if err := os.WriteFile(path, []byte(body), 0o755); err != nil {
t.Fatal(err)
}
return path
}
func TestCollect_EndToEnd(t *testing.T) {
bin := fakeDNSVizScript(t)
c := &Collector{Bin: bin, ExtraArgs: ""}
out, err := c.Collect(context.Background(), sdk.CheckerOptions{
"domain_name": "example.com.",
"probeTimeoutSeconds": float64(5),
})
if err != nil {
t.Fatalf("Collect: %v", err)
}
d, ok := out.(*checker.DNSVizData)
if !ok {
t.Fatalf("type=%T", out)
}
if d.Domain != "example.com" {
t.Errorf("domain not normalized: %q", d.Domain)
}
if len(d.Zones) != 2 {
t.Errorf("expected 2 zones from grok, got %d", len(d.Zones))
}
if d.Zones["example.com."].Status != "SECURE" {
t.Errorf("status=%q", d.Zones["example.com."].Status)
}
if len(d.Raw) == 0 {
t.Error("raw should be populated")
}
}
func TestCollect_ProbeFailure(t *testing.T) {
// A non-existent binary makes probe fail. The error path should bubble up
// and not be conflated with successful execution.
c := &Collector{Bin: "/nonexistent/dnsviz/binary"}
_, err := c.Collect(context.Background(), sdk.CheckerOptions{"domain_name": "example.com"})
if err == nil || !strings.Contains(err.Error(), "dnsviz probe failed") {
t.Errorf("expected probe-failed error, got %v", err)
}
}
func TestCollect_ContextCanceled(t *testing.T) {
bin := fakeDNSVizScript(t)
c := &Collector{Bin: bin}
ctx, cancel := context.WithCancel(context.Background())
cancel()
_, err := c.Collect(ctx, sdk.CheckerOptions{"domain_name": "example.com"})
if err == nil {
t.Fatal("expected error from cancelled context")
}
// Either probe or grok should report cancellation. We don't assert on
// the exact wording: just that it surfaced.
if !errors.Is(err, context.Canceled) && !strings.Contains(err.Error(), "dnsviz probe failed") &&
!strings.Contains(err.Error(), "dnsviz grok failed") {
t.Errorf("unexpected error: %v", err)
}
}
func TestCollect_TimeoutHonoured(t *testing.T) {
if runtime.GOOS == "windows" {
t.Skip("POSIX shell needed")
}
dir := t.TempDir()
bin := filepath.Join(dir, "dnsviz")
// Sleep longer than the configured timeout; both probe and grok will
// stall, so the call should return a timeout-flavoured error.
// `exec sleep` so the shell process replaces itself with sleep, leaving
// a single PID for exec.CommandContext to SIGKILL on timeout (otherwise
// the orphaned sleep keeps the stdout pipe open and Wait blocks).
body := "#!/bin/sh\nexec sleep 5\n"
if err := os.WriteFile(bin, []byte(body), 0o755); err != nil {
t.Fatal(err)
}
c := &Collector{Bin: bin}
start := time.Now()
_, err := c.Collect(context.Background(), sdk.CheckerOptions{
"domain_name": "example.com",
"probeTimeoutSeconds": float64(1),
})
elapsed := time.Since(start)
if err == nil {
t.Fatal("expected timeout error")
}
if elapsed > 4*time.Second {
t.Errorf("timeout not enforced: elapsed %v", elapsed)
}
}