Adding upstream version 252.22.upstream/252.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 419 insertions, 0 deletions

diff --git a/src/test/test-in-addr-util.c b/src/test/test-in-addr-util.c
new file mode 100644
index 0000000..31d767e
--- /dev/null
+++ b/src/test/test-in-addr-util.c
@@ -0,0 +1,419 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <fnmatch.h>
+#include <netinet/in.h>
+
+#include "in-addr-util.h"
+#include "strv.h"
+#include "tests.h"
+
+static void test_in_addr_prefix_from_string_one(
+                const char *p,
+                int family,
+                int ret,
+                const union in_addr_union *u,
+                unsigned char prefixlen,
+                int ret_refuse,
+                unsigned char prefixlen_refuse,
+                int ret_legacy,
+                unsigned char prefixlen_legacy) {
+
+        union in_addr_union q;
+        unsigned char l;
+        int f, r;
+
+        r = in_addr_prefix_from_string(p, family, &q, &l);
+        assert_se(r == ret);
+
+        if (r < 0)
+                return;
+
+        assert_se(in_addr_equal(family, &q, u));
+        assert_se(l == prefixlen);
+
+        r = in_addr_prefix_from_string_auto(p, &f, &q, &l);
+        assert_se(r >= 0);
+
+        assert_se(f == family);
+        assert_se(in_addr_equal(family, &q, u));
+        assert_se(l == prefixlen);
+
+        r = in_addr_prefix_from_string_auto_internal(p, PREFIXLEN_REFUSE, &f, &q, &l);
+        assert_se(r == ret_refuse);
+
+        if (r >= 0) {
+                assert_se(f == family);
+                assert_se(in_addr_equal(family, &q, u));
+                assert_se(l == prefixlen_refuse);
+        }
+
+        r = in_addr_prefix_from_string_auto_internal(p, PREFIXLEN_LEGACY, &f, &q, &l);
+        assert_se(r == ret_legacy);
+
+        if (r >= 0) {
+                assert_se(f == family);
+                assert_se(in_addr_equal(family, &q, u));
+                assert_se(l == prefixlen_legacy);
+        }
+}
+
+TEST(in_addr_prefix_from_string) {
+        test_in_addr_prefix_from_string_one("", AF_INET, -EINVAL, NULL, 0, -EINVAL, 0, -EINVAL, 0);
+        test_in_addr_prefix_from_string_one("/", AF_INET, -EINVAL, NULL, 0, -EINVAL, 0, -EINVAL, 0);
+        test_in_addr_prefix_from_string_one("/8", AF_INET, -EINVAL, NULL, 0, -EINVAL, 0, -EINVAL, 0);
+        test_in_addr_prefix_from_string_one("1.2.3.4", AF_INET, 0, &(union in_addr_union) { .in = (struct in_addr) { .s_addr = htobe32(0x01020304) } }, 32, -ENOANO, 0, 0, 8);
+        test_in_addr_prefix_from_string_one("1.2.3.4/0", AF_INET, 0, &(union in_addr_union) { .in = (struct in_addr) { .s_addr = htobe32(0x01020304) } }, 0, 0, 0, 0, 0);
+        test_in_addr_prefix_from_string_one("1.2.3.4/1", AF_INET, 0, &(union in_addr_union) { .in = (struct in_addr) { .s_addr = htobe32(0x01020304) } }, 1, 0, 1, 0, 1);
+        test_in_addr_prefix_from_string_one("1.2.3.4/2", AF_INET, 0, &(union in_addr_union) { .in = (struct in_addr) { .s_addr = htobe32(0x01020304) } }, 2, 0, 2, 0, 2);
+        test_in_addr_prefix_from_string_one("1.2.3.4/32", AF_INET, 0, &(union in_addr_union) { .in = (struct in_addr) { .s_addr = htobe32(0x01020304) } }, 32, 0, 32, 0, 32);
+        test_in_addr_prefix_from_string_one("1.2.3.4/33", AF_INET, -ERANGE, NULL, 0, -ERANGE, 0, -ERANGE, 0);
+        test_in_addr_prefix_from_string_one("1.2.3.4/-1", AF_INET, -ERANGE, NULL, 0, -ERANGE, 0, -ERANGE, 0);
+        test_in_addr_prefix_from_string_one("::1", AF_INET, -EINVAL, NULL, 0, -EINVAL, 0, -EINVAL, 0);
+
+        test_in_addr_prefix_from_string_one("", AF_INET6, -EINVAL, NULL, 0, -EINVAL, 0, -EINVAL, 0);
+        test_in_addr_prefix_from_string_one("/", AF_INET6, -EINVAL, NULL, 0, -EINVAL, 0, -EINVAL, 0);
+        test_in_addr_prefix_from_string_one("/8", AF_INET6, -EINVAL, NULL, 0, -EINVAL, 0, -EINVAL, 0);
+        test_in_addr_prefix_from_string_one("::1", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 128, -ENOANO, 0, 0, 0);
+        test_in_addr_prefix_from_string_one("::1/0", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 0, 0, 0, 0, 0);
+        test_in_addr_prefix_from_string_one("::1/1", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 1, 0, 1, 0, 1);
+        test_in_addr_prefix_from_string_one("::1/2", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 2, 0, 2, 0, 2);
+        test_in_addr_prefix_from_string_one("::1/32", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 32, 0, 32, 0, 32);
+        test_in_addr_prefix_from_string_one("::1/33", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 33, 0, 33, 0, 33);
+        test_in_addr_prefix_from_string_one("::1/64", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 64, 0, 64, 0, 64);
+        test_in_addr_prefix_from_string_one("::1/128", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 128, 0, 128, 0, 128);
+        test_in_addr_prefix_from_string_one("::1/129", AF_INET6, -ERANGE, NULL, 0, -ERANGE, 0, -ERANGE, 0);
+        test_in_addr_prefix_from_string_one("::1/-1", AF_INET6, -ERANGE, NULL, 0, -ERANGE, 0, -ERANGE, 0);
+}
+
+static void test_in_addr_prefix_to_string_valid(int family, const char *p) {
+        union in_addr_union u;
+        unsigned char l;
+
+        log_info("%s: %s", __func__, p);
+
+        assert_se(in_addr_prefix_from_string(p, family, &u, &l) >= 0);
+        assert_se(streq(p, IN_ADDR_PREFIX_TO_STRING(family, &u, l)));
+}
+
+static void test_in_addr_prefix_to_string_unoptimized(int family, const char *p) {
+        union in_addr_union u1, u2;
+        unsigned char len1, len2;
+
+        log_info("%s: %s", __func__, p);
+
+        assert_se(in_addr_prefix_from_string(p, family, &u1, &len1) >= 0);
+        const char *str1 = IN_ADDR_PREFIX_TO_STRING(family, &u1, len1);
+        assert_se(str1);
+        assert_se(in_addr_prefix_from_string(str1, family, &u2, &len2) >= 0);
+        const char *str2 = IN_ADDR_PREFIX_TO_STRING(family, &u2, len2);
+        assert_se(str2);
+
+        assert_se(streq(str1, str2));
+        assert_se(len1 == len2);
+        assert_se(in_addr_equal(family, &u1, &u2) > 0);
+}
+
+TEST(in_addr_prefix_to_string) {
+        test_in_addr_prefix_to_string_valid(AF_INET, "0.0.0.0/32");
+        test_in_addr_prefix_to_string_valid(AF_INET, "1.2.3.4/0");
+        test_in_addr_prefix_to_string_valid(AF_INET, "1.2.3.4/24");
+        test_in_addr_prefix_to_string_valid(AF_INET, "1.2.3.4/32");
+        test_in_addr_prefix_to_string_valid(AF_INET, "255.255.255.255/32");
+
+        test_in_addr_prefix_to_string_valid(AF_INET6, "::1/128");
+        test_in_addr_prefix_to_string_valid(AF_INET6, "fd00:abcd::1/64");
+        test_in_addr_prefix_to_string_valid(AF_INET6, "fd00:abcd::1234:1/64");
+        test_in_addr_prefix_to_string_valid(AF_INET6, "1111:2222:3333:4444:5555:6666:7777:8888/128");
+
+        test_in_addr_prefix_to_string_unoptimized(AF_INET, "0.0.0.0");
+        test_in_addr_prefix_to_string_unoptimized(AF_INET, "192.168.0.1");
+
+        test_in_addr_prefix_to_string_unoptimized(AF_INET6, "fd00:0000:0000:0000:0000:0000:0000:0001/64");
+        test_in_addr_prefix_to_string_unoptimized(AF_INET6, "fd00:1111::0000:2222:3333:4444:0001/64");
+}
+
+TEST(in_addr_random_prefix) {
+        _cleanup_free_ char *str = NULL;
+        union in_addr_union a;
+
+        assert_se(in_addr_from_string(AF_INET, "192.168.10.1", &a) >= 0);
+
+        assert_se(in_addr_random_prefix(AF_INET, &a, 31, 32) >= 0);
+        assert_se(in_addr_to_string(AF_INET, &a, &str) >= 0);
+        assert_se(STR_IN_SET(str, "192.168.10.0", "192.168.10.1"));
+        str = mfree(str);
+
+        assert_se(in_addr_random_prefix(AF_INET, &a, 24, 26) >= 0);
+        assert_se(in_addr_to_string(AF_INET, &a, &str) >= 0);
+        assert_se(startswith(str, "192.168.10."));
+        str = mfree(str);
+
+        assert_se(in_addr_random_prefix(AF_INET, &a, 16, 24) >= 0);
+        assert_se(in_addr_to_string(AF_INET, &a, &str) >= 0);
+        assert_se(fnmatch("192.168.[0-9]*.0", str, 0) == 0);
+        str = mfree(str);
+
+        assert_se(in_addr_random_prefix(AF_INET, &a, 8, 24) >= 0);
+        assert_se(in_addr_to_string(AF_INET, &a, &str) >= 0);
+        assert_se(fnmatch("192.[0-9]*.[0-9]*.0", str, 0) == 0);
+        str = mfree(str);
+
+        assert_se(in_addr_random_prefix(AF_INET, &a, 8, 16) >= 0);
+        assert_se(in_addr_to_string(AF_INET, &a, &str) >= 0);
+        assert_se(fnmatch("192.[0-9]*.0.0", str, 0) == 0);
+        str = mfree(str);
+
+        assert_se(in_addr_from_string(AF_INET6, "fd00::1", &a) >= 0);
+
+        assert_se(in_addr_random_prefix(AF_INET6, &a, 16, 64) >= 0);
+        assert_se(in_addr_to_string(AF_INET6, &a, &str) >= 0);
+        assert_se(startswith(str, "fd00:"));
+        str = mfree(str);
+
+        assert_se(in_addr_random_prefix(AF_INET6, &a, 8, 16) >= 0);
+        assert_se(in_addr_to_string(AF_INET6, &a, &str) >= 0);
+        assert_se(fnmatch("fd??::", str, 0) == 0);
+        str = mfree(str);
+}
+
+TEST(in_addr_is_null) {
+        union in_addr_union i = {};
+
+        assert_se(in_addr_is_null(AF_INET, &i) == true);
+        assert_se(in_addr_is_null(AF_INET6, &i) == true);
+
+        i.in.s_addr = 0x1000000;
+        assert_se(in_addr_is_null(AF_INET, &i) == false);
+        assert_se(in_addr_is_null(AF_INET6, &i) == false);
+
+        assert_se(in_addr_is_null(-1, &i) == -EAFNOSUPPORT);
+}
+
+static void test_in_addr_prefix_intersect_one(unsigned f, const char *a, unsigned apl, const char *b, unsigned bpl, int result) {
+        union in_addr_union ua, ub;
+
+        assert_se(in_addr_from_string(f, a, &ua) >= 0);
+        assert_se(in_addr_from_string(f, b, &ub) >= 0);
+
+        assert_se(in_addr_prefix_intersect(f, &ua, apl, &ub, bpl) == result);
+}
+
+TEST(in_addr_prefix_intersect) {
+        test_in_addr_prefix_intersect_one(AF_INET, "255.255.255.255", 32, "255.255.255.254", 32, 0);
+        test_in_addr_prefix_intersect_one(AF_INET, "255.255.255.255", 0, "255.255.255.255", 32, 1);
+        test_in_addr_prefix_intersect_one(AF_INET, "0.0.0.0", 0, "47.11.8.15", 32, 1);
+
+        test_in_addr_prefix_intersect_one(AF_INET, "1.1.1.1", 24, "1.1.1.1", 24, 1);
+        test_in_addr_prefix_intersect_one(AF_INET, "2.2.2.2", 24, "1.1.1.1", 24, 0);
+
+        test_in_addr_prefix_intersect_one(AF_INET, "1.1.1.1", 24, "1.1.1.127", 25, 1);
+        test_in_addr_prefix_intersect_one(AF_INET, "1.1.1.1", 24, "1.1.1.127", 26, 1);
+        test_in_addr_prefix_intersect_one(AF_INET, "1.1.1.1", 25, "1.1.1.127", 25, 1);
+        test_in_addr_prefix_intersect_one(AF_INET, "1.1.1.1", 25, "1.1.1.255", 25, 0);
+
+        test_in_addr_prefix_intersect_one(AF_INET6, "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff", 128, "ffff:ffff:ffff:ffff:ffff:ffff:ffff:fffe", 128, 0);
+        test_in_addr_prefix_intersect_one(AF_INET6, "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff", 0, "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff", 128, 1);
+        test_in_addr_prefix_intersect_one(AF_INET6, "::", 0, "beef:beef:beef:beef:beef:beef:beef:beef", 128, 1);
+
+        test_in_addr_prefix_intersect_one(AF_INET6, "1::2", 64, "1::2", 64, 1);
+        test_in_addr_prefix_intersect_one(AF_INET6, "2::2", 64, "1::2", 64, 0);
+
+        test_in_addr_prefix_intersect_one(AF_INET6, "1::1", 120, "1::007f", 121, 1);
+        test_in_addr_prefix_intersect_one(AF_INET6, "1::1", 120, "1::007f", 122, 1);
+        test_in_addr_prefix_intersect_one(AF_INET6, "1::1", 121, "1::007f", 121, 1);
+        test_in_addr_prefix_intersect_one(AF_INET6, "1::1", 121, "1::00ff", 121, 0);
+}
+
+static void test_in_addr_prefix_next_one(unsigned f, const char *before, unsigned pl, const char *after) {
+        union in_addr_union ubefore, uafter, t;
+
+        log_debug("/* %s(%s, prefixlen=%u) */", __func__, before, pl);
+
+        assert_se(in_addr_from_string(f, before, &ubefore) >= 0);
+
+        t = ubefore;
+        assert_se((in_addr_prefix_next(f, &t, pl) >= 0) == !!after);
+
+        if (after) {
+                assert_se(in_addr_from_string(f, after, &uafter) >= 0);
+                assert_se(in_addr_equal(f, &t, &uafter) > 0);
+        }
+}
+
+TEST(in_addr_prefix_next) {
+        test_in_addr_prefix_next_one(AF_INET, "192.168.0.0", 24, "192.168.1.0");
+        test_in_addr_prefix_next_one(AF_INET, "192.168.0.0", 16, "192.169.0.0");
+        test_in_addr_prefix_next_one(AF_INET, "192.168.0.0", 20, "192.168.16.0");
+
+        test_in_addr_prefix_next_one(AF_INET, "0.0.0.0", 32, "0.0.0.1");
+        test_in_addr_prefix_next_one(AF_INET, "255.255.255.254", 32, "255.255.255.255");
+        test_in_addr_prefix_next_one(AF_INET, "255.255.255.255", 32, NULL);
+        test_in_addr_prefix_next_one(AF_INET, "255.255.255.0", 24, NULL);
+
+        test_in_addr_prefix_next_one(AF_INET6, "4400::", 128, "4400::0001");
+        test_in_addr_prefix_next_one(AF_INET6, "4400::", 120, "4400::0100");
+        test_in_addr_prefix_next_one(AF_INET6, "4400::", 127, "4400::0002");
+        test_in_addr_prefix_next_one(AF_INET6, "4400::", 8, "4500::");
+        test_in_addr_prefix_next_one(AF_INET6, "4400::", 7, "4600::");
+
+        test_in_addr_prefix_next_one(AF_INET6, "::", 128, "::1");
+
+        test_in_addr_prefix_next_one(AF_INET6, "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff", 128, NULL);
+        test_in_addr_prefix_next_one(AF_INET6, "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ff00", 120, NULL);
+}
+
+static void test_in_addr_prefix_nth_one(unsigned f, const char *before, unsigned pl, uint64_t nth, const char *after) {
+        union in_addr_union ubefore, uafter, t;
+
+        log_debug("/* %s(%s, prefixlen=%u, nth=%"PRIu64") */", __func__, before, pl, nth);
+
+        assert_se(in_addr_from_string(f, before, &ubefore) >= 0);
+
+        t = ubefore;
+        assert_se((in_addr_prefix_nth(f, &t, pl, nth) >= 0) == !!after);
+
+        if (after) {
+                assert_se(in_addr_from_string(f, after, &uafter) >= 0);
+                assert_se(in_addr_equal(f, &t, &uafter) > 0);
+        }
+}
+
+TEST(in_addr_prefix_nth) {
+        test_in_addr_prefix_nth_one(AF_INET, "192.168.0.0", 24, 0, "192.168.0.0");
+        test_in_addr_prefix_nth_one(AF_INET, "192.168.0.123", 24, 0, "192.168.0.0");
+        test_in_addr_prefix_nth_one(AF_INET, "192.168.0.123", 24, 1, "192.168.1.0");
+        test_in_addr_prefix_nth_one(AF_INET, "192.168.0.0", 24, 4, "192.168.4.0");
+        test_in_addr_prefix_nth_one(AF_INET, "192.168.0.0", 25, 1, "192.168.0.128");
+        test_in_addr_prefix_nth_one(AF_INET, "192.168.255.0", 25, 1, "192.168.255.128");
+        test_in_addr_prefix_nth_one(AF_INET, "192.168.255.0", 24, 0, "192.168.255.0");
+        test_in_addr_prefix_nth_one(AF_INET, "255.255.255.255", 32, 1, NULL);
+        test_in_addr_prefix_nth_one(AF_INET, "255.255.255.255", 0, 1, NULL);
+
+        test_in_addr_prefix_nth_one(AF_INET6, "4400::", 8, 1, "4500::");
+        test_in_addr_prefix_nth_one(AF_INET6, "4400::", 7, 1, "4600::");
+        test_in_addr_prefix_nth_one(AF_INET6, "4400::", 64, 1, "4400:0:0:1::");
+        test_in_addr_prefix_nth_one(AF_INET6, "4400::", 64, 2, "4400:0:0:2::");
+        test_in_addr_prefix_nth_one(AF_INET6, "4400::", 64, 0xbad, "4400:0:0:0bad::");
+        test_in_addr_prefix_nth_one(AF_INET6, "4400:0:0:ffff::", 64, 1, "4400:0:1::");
+        test_in_addr_prefix_nth_one(AF_INET6, "4400::", 56, ((uint64_t)1<<48) -1, "44ff:ffff:ffff:ff00::");
+        test_in_addr_prefix_nth_one(AF_INET6, "0000::", 8, 255, "ff00::");
+        test_in_addr_prefix_nth_one(AF_INET6, "0000::", 8, 256, NULL);
+        test_in_addr_prefix_nth_one(AF_INET6, "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff", 128, 1, NULL);
+        test_in_addr_prefix_nth_one(AF_INET6, "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff", 0, 1, NULL);
+        test_in_addr_prefix_nth_one(AF_INET6, "1234:5678:90ab:cdef:1234:5678:90ab:cdef", 12, 1, "1240::");
+}
+
+static void test_in_addr_prefix_range_one(
+                int family,
+                const char *in,
+                unsigned prefixlen,
+                const char *expected_start,
+                const char *expected_end) {
+
+        union in_addr_union a, s, e;
+
+        log_debug("/* %s(%s, prefixlen=%u) */", __func__, in, prefixlen);
+
+        assert_se(in_addr_from_string(family, in, &a) >= 0);
+        assert_se((in_addr_prefix_range(family, &a, prefixlen, &s, &e) >= 0) == !!expected_start);
+
+        if (expected_start) {
+                union in_addr_union es;
+
+                assert_se(in_addr_from_string(family, expected_start, &es) >= 0);
+                assert_se(in_addr_equal(family, &s, &es) > 0);
+        }
+        if (expected_end) {
+                union in_addr_union ee;
+
+                assert_se(in_addr_from_string(family, expected_end, &ee) >= 0);
+                assert_se(in_addr_equal(family, &e, &ee) > 0);
+        }
+}
+
+TEST(in_addr_prefix_range) {
+        test_in_addr_prefix_range_one(AF_INET, "192.168.123.123", 24, "192.168.123.0", "192.168.124.0");
+        test_in_addr_prefix_range_one(AF_INET, "192.168.123.123", 16, "192.168.0.0", "192.169.0.0");
+
+        test_in_addr_prefix_range_one(AF_INET6, "dead:beef::", 64, "dead:beef::", "dead:beef:0:1::");
+        test_in_addr_prefix_range_one(AF_INET6, "dead:0:0:beef::", 64, "dead:0:0:beef::", "dead:0:0:bef0::");
+        test_in_addr_prefix_range_one(AF_INET6, "2001::",  48, "2001::", "2001:0:1::");
+        test_in_addr_prefix_range_one(AF_INET6, "2001::",  56, "2001::", "2001:0:0:0100::");
+        test_in_addr_prefix_range_one(AF_INET6, "2001::",  65, "2001::", "2001::8000:0:0:0");
+        test_in_addr_prefix_range_one(AF_INET6, "2001::",  66, "2001::", "2001::4000:0:0:0");
+        test_in_addr_prefix_range_one(AF_INET6, "2001::", 127, "2001::", "2001::2");
+}
+
+static void test_in_addr_to_string_one(int f, const char *addr) {
+        union in_addr_union ua;
+        _cleanup_free_ char *r;
+
+        assert_se(in_addr_from_string(f, addr, &ua) >= 0);
+        assert_se(in_addr_to_string(f, &ua, &r) >= 0);
+        printf("%s: %s == %s\n", __func__, addr, r);
+        assert_se(streq(addr, r));
+
+        assert_se(streq(r, IN_ADDR_TO_STRING(f, &ua)));
+}
+
+TEST(in_addr_to_string) {
+        test_in_addr_to_string_one(AF_INET, "192.168.0.1");
+        test_in_addr_to_string_one(AF_INET, "10.11.12.13");
+        test_in_addr_to_string_one(AF_INET6, "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
+        test_in_addr_to_string_one(AF_INET6, "::1");
+        test_in_addr_to_string_one(AF_INET6, "fe80::");
+}
+
+TEST(in_addr_prefixlen_to_netmask) {
+        union in_addr_union addr;
+        static const char *const ipv4_netmasks[] = {
+                "0.0.0.0", "128.0.0.0", "192.0.0.0", "224.0.0.0", "240.0.0.0",
+                "248.0.0.0", "252.0.0.0", "254.0.0.0", "255.0.0.0",
+                "255.128.0.0", "255.192.0.0", "255.224.0.0", "255.240.0.0",
+                "255.248.0.0", "255.252.0.0", "255.254.0.0", "255.255.0.0",
+                "255.255.128.0", "255.255.192.0", "255.255.224.0", "255.255.240.0",
+                "255.255.248.0", "255.255.252.0", "255.255.254.0", "255.255.255.0",
+                "255.255.255.128", "255.255.255.192", "255.255.255.224", "255.255.255.240",
+                "255.255.255.248", "255.255.255.252", "255.255.255.254", "255.255.255.255",
+        };
+
+        static const char *const ipv6_netmasks[] = {
+                [0]   = "::",
+                [1]   = "8000::",
+                [2]   = "c000::",
+                [7]   = "fe00::",
+                [8]   = "ff00::",
+                [9]   = "ff80::",
+                [16]  = "ffff::",
+                [17]  = "ffff:8000::",
+                [32]  = "ffff:ffff::",
+                [33]  = "ffff:ffff:8000::",
+                [64]  = "ffff:ffff:ffff:ffff::",
+                [65]  = "ffff:ffff:ffff:ffff:8000::",
+                [96]  = "ffff:ffff:ffff:ffff:ffff:ffff::",
+                [97]  = "ffff:ffff:ffff:ffff:ffff:ffff:8000:0",
+                [127] = "ffff:ffff:ffff:ffff:ffff:ffff:ffff:fffe",
+                [128] = "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"
+        };
+
+        for (unsigned char prefixlen = 0; prefixlen <= 32; prefixlen++) {
+                _cleanup_free_ char *result = NULL;
+
+                assert_se(in_addr_prefixlen_to_netmask(AF_INET, &addr, prefixlen) >= 0);
+                assert_se(in_addr_to_string(AF_INET, &addr, &result) >= 0);
+                printf("test_in_addr_prefixlen_to_netmask: %s == %s\n", ipv4_netmasks[prefixlen], result);
+                assert_se(streq(ipv4_netmasks[prefixlen], result));
+        }
+
+        for (unsigned char prefixlen = 0; prefixlen <= 128; prefixlen++) {
+                _cleanup_free_ char *result = NULL;
+
+                assert_se(in_addr_prefixlen_to_netmask(AF_INET6, &addr, prefixlen) >= 0);
+                assert_se(in_addr_to_string(AF_INET6, &addr, &result) >= 0);
+                printf("test_in_addr_prefixlen_to_netmask: %s\n", result);
+                if (ipv6_netmasks[prefixlen])
+                        assert_se(streq(ipv6_netmasks[prefixlen], result));
+        }
+}
+
+DEFINE_TEST_MAIN(LOG_DEBUG);