| |
| """Find CVEs that have identified diff URLs in NVD but no usable .diff file. |
| |
| Walks every nvdcve-2.0-YYYY.json under dataset/nvd/data, collects the same |
| diff-bearing reference URLs that download.py would try to fetch, then |
| verifies that the expected file (data/<year>/<bucket>xxx/CVE-YYYY-NNNN.diff) |
| exists and contains real diff content. |
| |
| Statuses: |
| missing no file on disk |
| empty file exists but is 0-byte |
| invalid file exists but contains no `diff --git ` and no |
| git-format-patch header (likely HTML / 404 / JSON error) |
| ok file is a real diff (not reported) |
| |
| Outputs (under <cve_diff>/.logs/, next to failures.tsv): |
| missing.log one line per (CVE, original URL): ts, status, cve, url |
| missing.tsv cve, status, expected_path, original_url, diff_url |
| |
| Complements failures.tsv: failures.tsv lists per-URL fetch failures, |
| missing.tsv surfaces CVEs whose final .diff file is absent or invalid as |
| a whole — including cases the downloader silently skipped. |
| |
| Usage: |
| python missing.py |
| """ |
|
|
| from __future__ import annotations |
|
|
| import datetime as dt |
| import json |
| import pathlib |
| import sys |
|
|
|
|
| SCRIPT_DIR = pathlib.Path(__file__).resolve().parent |
| sys.path.insert(0, str(SCRIPT_DIR)) |
|
|
| import download |
|
|
|
|
| NVD_DIR = download.DATA_DIR |
| LOG_DIR = download.LOG_DIR |
|
|
|
|
| def extract_pairs(): |
| """Yield (cve_id, [url, ...]) for every CVE whose NVD references contain |
| at least one URL that download.py would treat as a diff source.""" |
| for path in sorted(NVD_DIR.glob("nvdcve-2.0-*.json")): |
| print(f"[scan] {path.name}", file=sys.stderr) |
| try: |
| with open(path, "rb") as fh: |
| data = json.load(fh) |
| except (OSError, json.JSONDecodeError) as e: |
| print(f"[warn] failed to parse {path.name}: {e}", file=sys.stderr) |
| continue |
| for item in data.get("vulnerabilities", []): |
| cve = item.get("cve") or {} |
| cve_id = cve.get("id") |
| if not cve_id: |
| continue |
| urls = [] |
| seen = set() |
| for ref in cve.get("references") or []: |
| url = ref.get("url") |
| if url and url not in seen and download.filter_url(url): |
| urls.append(url) |
| seen.add(url) |
| if urls: |
| yield cve_id, urls |
|
|
|
|
| def classify(target: pathlib.Path) -> str: |
| if not target.is_file(): |
| return "missing" |
| try: |
| body = target.read_bytes() |
| except OSError: |
| return "missing" |
| if not body: |
| return "empty" |
| if not download.looks_like_diff(body): |
| return "invalid" |
| return "ok" |
|
|
|
|
| def main() -> int: |
| if not NVD_DIR.is_dir(): |
| print(f"error: {NVD_DIR} is not a directory", file=sys.stderr) |
| return 2 |
|
|
| LOG_DIR.mkdir(parents=True, exist_ok=True) |
| log_path = LOG_DIR / "missing.log" |
| tsv_path = LOG_DIR / "missing.tsv" |
|
|
| n_total = 0 |
| counts = {"ok": 0, "missing": 0, "empty": 0, "invalid": 0} |
|
|
| with open(log_path, "w", encoding="utf-8") as log, \ |
| open(tsv_path, "w", encoding="utf-8") as tsv: |
| tsv.write("cve\tstatus\texpected_path\toriginal_url\tdiff_url\n") |
| for cve_id, urls in extract_pairs(): |
| n_total += 1 |
| target = download.target_for(cve_id) |
| status = classify(target) |
| counts[status] += 1 |
| if status == "ok": |
| continue |
| try: |
| rel_target = target.relative_to(SCRIPT_DIR) |
| except ValueError: |
| rel_target = target |
| ts = dt.datetime.now().strftime("%Y-%m-%d %H:%M:%S") |
| for url in urls: |
| diff_url = download.to_diff_url(url) or "" |
| log.write(f"{ts}\t{status}\t{cve_id}\t{url}\n") |
| tsv.write( |
| f"{cve_id}\t{status}\t{rel_target}\t{url}\t{diff_url}\n" |
| ) |
|
|
| bad = counts["missing"] + counts["empty"] + counts["invalid"] |
| print(f"[done] {n_total} CVE(s) with diff URLs", file=sys.stderr) |
| print( |
| f" ok={counts['ok']} missing={counts['missing']} " |
| f"empty={counts['empty']} invalid={counts['invalid']}", |
| file=sys.stderr, |
| ) |
| print(f" log={log_path}", file=sys.stderr) |
| print(f" tsv={tsv_path}", file=sys.stderr) |
| return 1 if bad else 0 |
|
|
|
|
| if __name__ == "__main__": |
| sys.exit(main()) |
|
|
