feat(checker): add libreswan checker (#4814)

Signed-off-by: Fabrice Fontaine <fabrice.fontaine@orange.com>

Author: ffontaine

cve_bin_tool/checkers/__init__.py

@@ -200,6 +200,7 @@
     "libpcap",
     "libraw",
     "libreoffice",
+    "libreswan",
     "librsvg",
     "librsync",
     "libsamplerate",

cve_bin_tool/checkers/libreswan.py

@@ -0,0 +1,20 @@
+# Copyright (C) 2025 Orange
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+
+"""
+CVE checker for libreswan
+
+https://www.cvedetails.com/product/26318/Libreswan-Libreswan.html?vendor_id=12913
+
+"""
+from __future__ import annotations
+
+from cve_bin_tool.checkers import Checker
+
+
+class LibreswanChecker(Checker):
+    CONTAINS_PATTERNS: list[str] = []
+    FILENAME_PATTERNS: list[str] = []
+    VERSION_PATTERNS = [r"libreswan-([0-9]+\.[0-9]+)"]
+    VENDOR_PRODUCT = [("libreswan", "libreswan")]

test/condensed-downloads/libreswan-3.29-r1.apk.tar.gz

@@ -0,0 +1,32 @@
+# Copyright (C) 2025 Orange
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+mapping_test_data = [
+    {"product": "libreswan", "version": "3.32", "version_strings": ["libreswan-3.32"]}
+]
+package_test_data = [
+    {
+        "url": "http://rpmfind.net/linux/fedora/linux/development/rawhide/Everything/aarch64/os/Packages/l/",
+        "package_name": "libreswan-5.1-5.fc42.aarch64.rpm",
+        "product": "libreswan",
+        "version": "5.1",
+    },
+    {
+        "url": "http://ftp.debian.org/debian/pool/main/libr/libreswan/",
+        "package_name": "libreswan_3.27-6+deb10u1_amd64.deb",
+        "product": "libreswan",
+        "version": "3.27",
+    },
+    {
+        "url": "https://downloads.openwrt.org/releases/packages-19.07/x86_64/packages/",
+        "package_name": "libreswan_3.32-1_x86_64.ipk",
+        "product": "libreswan",
+        "version": "3.32",
+    },
+    {
+        "url": "https://dl-cdn.alpinelinux.org/alpine/v3.11/community/x86_64/",
+        "package_name": "libreswan-3.29-r1.apk",
+        "product": "libreswan",
+        "version": "3.29",
+    },
+]