tests: add test utils

4 files changed, 777 insertions, 6 deletions

diff --git a/tests/cksuite-all-attr.c b/tests/cksuite-all-attr.c
index 3b511f6..824a596 100644
--- a/tests/cksuite-all-attr.c
+++ b/tests/cksuite-all-attr.c
@@ -117,6 +117,31 @@ START_TEST(clone_cls_u32)
 }
 END_TEST
 
+/*****************************************************************************/
+
+START_TEST(test_nltst_strtok)
+{
+#define _assert_strtok(str, ...)                                               \
+	do {                                                                   \
+		const char *const _expected[] = { NULL, ##__VA_ARGS__, NULL }; \
+		_nltst_auto_strfreev char **_tokens = NULL;                    \
+                                                                               \
+		_tokens = _nltst_strtokv(str);                                 \
+		_nltst_assert_strv_equal(_tokens, &_expected[1]);              \
+	} while (0)
+
+	_assert_strtok("");
+	_assert_strtok("    \n");
+	_assert_strtok("a", "a");
+	_assert_strtok(" a ", "a");
+	_assert_strtok(" a\\  b", "a\\ ", "b");
+	_assert_strtok(" a\\  b   cc\\d", "a\\ ", "b", "cc\\d");
+	_assert_strtok(" a\\  b\\   cc\\d", "a\\ ", "b\\ ", "cc\\d");
+}
+END_TEST
+
+/*****************************************************************************/
+
 Suite *make_nl_attr_suite(void)
 {
 	Suite *suite = suite_create("Netlink attributes");
@@ -125,6 +150,7 @@ Suite *make_nl_attr_suite(void)
 	tcase_add_test(tc, attr_size);
 	tcase_add_test(tc, msg_construct);
 	tcase_add_test(tc, clone_cls_u32);
+	tcase_add_test(tc, test_nltst_strtok);
 	suite_add_tcase(suite, tc);
 
 	return suite;
diff --git a/tests/cksuite-all-netns.c b/tests/cksuite-all-netns.c
index 872c54e..48aacf1 100644
--- a/tests/cksuite-all-netns.c
+++ b/tests/cksuite-all-netns.c
@@ -45,7 +45,8 @@ START_TEST(cache_and_clone)
 
 	for (i = 0; i < _NL_N_ELEMENTS(links); i++) {
 		if (links[i].add)
-			_nltst_add_link(NULL, links[i].ifname, links[i].kind);
+			_nltst_add_link(NULL, links[i].ifname, links[i].kind,
+					NULL);
 	}
 
 	sk = _nltst_socket(NETLINK_ROUTE);
@@ -57,11 +58,11 @@ START_TEST(cache_and_clone)
 	ck_assert_int_eq(r, 0);
 
 	for (i = 0; i < _NL_N_ELEMENTS(links); i++) {
-		_nl_auto_rtnl_link struct rtnl_link *link = NULL;
 		_nl_auto_rtnl_link struct rtnl_link *link_clone = NULL;
+		struct rtnl_link *link;
 
-		link = rtnl_link_get_by_name(link_cache, links[i].ifname);
-		ck_assert(link);
+		link = _nltst_cache_get_link(link_cache, links[i].ifname);
+		ck_assert_ptr_nonnull(link);
 
 		ck_assert_str_eq(rtnl_link_get_name(link), links[i].ifname);
 
diff --git a/tests/nl-test-util.c b/tests/nl-test-util.c
index 5f5059f..1f67ac8 100644
--- a/tests/nl-test-util.c
+++ b/tests/nl-test-util.c
@@ -3,6 +3,8 @@
 #include "nl-test-util.h"
 
 #include <fcntl.h>
+#include <inttypes.h>
+#include <limits.h>
 #include <sched.h>
 #include <stdbool.h>
 #include <stdio.h>
@@ -13,10 +15,70 @@
 #include "netlink-private/utils.h"
 #include "netlink/netlink.h"
 #include "netlink/route/link.h"
+#include "netlink/route/route.h"
 #include "netlink/socket.h"
 
 /*****************************************************************************/
 
+void _nltst_get_urandom(void *ptr, size_t len)
+{
+	int fd;
+	ssize_t nread;
+
+	ck_assert_int_gt(len, 0);
+	ck_assert_ptr_nonnull(ptr);
+
+	fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC | O_NOCTTY);
+	_nltst_assert_errno(fd >= 0);
+
+	nread = read(fd, ptr, len);
+	_nltst_assert_errno(nread == len);
+
+	_nltst_close(fd);
+}
+
+uint32_t _nltst_rand_u32(void)
+{
+	_nl_thread_local static unsigned short entropy[3];
+	_nl_thread_local static bool has_entropy = false;
+
+	if (!has_entropy) {
+		unsigned long long seed;
+		uint64_t seed64;
+		const char *s;
+		char *s_end;
+
+		memset(entropy, 0, sizeof(entropy));
+		s = getenv("NLTST_SEED_RAND");
+		if (!s)
+			seed = 0;
+		else if (s[0] != '\0') {
+			errno = 0;
+			seed = strtoull(s, &s_end, 10);
+			if (errno != 0 || s_end[0] != '\0') {
+				ck_assert_msg(
+					0,
+					"invalid NLTST_SEED_RAND=\"%s\". Must be an integer to seed the random numbers",
+					s);
+			}
+		} else
+			_nltst_get_urandom(&seed, sizeof(seed));
+
+		seed64 = seed;
+		printf("runs with NLTST_SEED_RAND=%" PRIu64 "\n", seed64);
+
+		entropy[0] = (seed64 >> 0) ^ (seed64 >> 48);
+		entropy[1] = (seed64 >> 16) ^ (seed64 >> 0);
+		entropy[2] = (seed64 >> 32) ^ (seed64 >> 16);
+		has_entropy = true;
+	}
+
+	_NL_STATIC_ASSERT(sizeof(long) >= sizeof(uint32_t));
+	return jrand48(entropy);
+}
+
+/*****************************************************************************/
+
 #define _CANARY 539339
 
 struct nltst_netns {
@@ -157,6 +219,26 @@ void _nltst_object_identical(const void *a, const void *b)
 
 /*****************************************************************************/
 
+char *_nltst_object_to_string(struct nl_object *obj)
+{
+	size_t L = 1024;
+	size_t l;
+	char *s;
+
+	if (!obj)
+		return strdup("(null)");
+
+	s = malloc(L);
+	ck_assert_ptr_nonnull(s);
+
+	nl_object_dump_buf(obj, s, L);
+	l = strlen(s);
+	ck_assert_int_lt(l, L);
+	s = realloc(s, l + 1);
+	ck_assert_ptr_nonnull(s);
+	return s;
+}
+
 struct cache_get_all_data {
 	struct nl_object **arr;
 	size_t len;
@@ -184,6 +266,9 @@ struct nl_object **_nltst_cache_get_all(struct nl_cache *cache, size_t *out_len)
 		.idx = 0,
 		.len = 0,
 	};
+	size_t len2 = 0;
+	size_t i;
+	size_t j;
 
 	ck_assert(cache);
 
@@ -198,12 +283,58 @@ struct nl_object **_nltst_cache_get_all(struct nl_cache *cache, size_t *out_len)
 
 	ck_assert_int_eq(data.idx, data.len);
 
+	ck_assert_int_le(data.len, SSIZE_MAX);
+
 	data.arr[data.len] = NULL;
 	if (out_len)
 		*out_len = data.len;
+
+	/* double check the result. */
+	for (struct nl_object *obj = nl_cache_get_first(cache); obj;
+	     obj = nl_cache_get_next(obj)) {
+		ck_assert_ptr_eq(data.arr[len2], obj);
+		len2++;
+	}
+	ck_assert_ptr_null(data.arr[len2]);
+
+	for (i = 0; i < data.len; i++) {
+		ck_assert_ptr_nonnull(data.arr[i]);
+		for (j = i + 1; j < data.len; j++)
+			ck_assert_ptr_ne(data.arr[i], data.arr[j]);
+	}
+
 	return data.arr;
 }
 
+struct rtnl_link *_nltst_cache_get_link(struct nl_cache *cache,
+					const char *ifname)
+{
+	_nl_auto_free struct nl_object **objs = NULL;
+	struct rtnl_link *link = NULL;
+	size_t i;
+
+	ck_assert_ptr_nonnull(cache);
+	ck_assert_ptr_nonnull(ifname);
+
+	objs = _nltst_cache_get_all(cache, NULL);
+	for (i = 0; objs[i]; i++) {
+		if (_nl_streq(rtnl_link_get_name((struct rtnl_link *)objs[i]),
+			      ifname)) {
+			ck_assert_ptr_null(link);
+			link = (struct rtnl_link *)objs[i];
+		}
+	}
+
+	if (_nltst_rand_u32_range(5) == 0) {
+		_nl_auto_rtnl_link struct rtnl_link *link2 = NULL;
+
+		link2 = rtnl_link_get_by_name(cache, ifname);
+		ck_assert_ptr_eq(link2, link);
+	}
+
+	return link;
+}
+
 /*****************************************************************************/
 
 struct nl_sock *_nltst_socket(int protocol)
@@ -217,18 +348,32 @@ struct nl_sock *_nltst_socket(int protocol)
 	r = nl_connect(sk, protocol);
 	ck_assert_int_eq(r, 0);
 
+	if (_nltst_rand_u32_range(5) == 0)
+		nl_cache_free(_nltst_rtnl_link_alloc_cache(sk, AF_UNSPEC, 0));
+
+	if (_nltst_rand_u32_range(5) == 0)
+		nl_cache_free(_nltst_rtnl_route_alloc_cache(
+			sk, _nltst_rand_select(AF_UNSPEC, AF_INET, AF_INET6)));
+
 	return sk;
 }
 
-void _nltst_add_link(struct nl_sock *sk, const char *ifname, const char *kind)
+void _nltst_add_link(struct nl_sock *sk, const char *ifname, const char *kind,
+		     int *out_ifindex)
 {
 	_nl_auto_nl_socket struct nl_sock *sk_free = NULL;
 	_nl_auto_rtnl_link struct rtnl_link *link = NULL;
+	_nl_auto_nl_cache struct nl_cache *cache = NULL;
+	struct rtnl_link *link2;
+	int ifindex;
 	int r;
 
 	ck_assert(ifname);
 	ck_assert(kind);
 
+	if (_nltst_rand_u32_range(5) == 0)
+		_nltst_assert_link_not_exists(ifname);
+
 	if (!sk) {
 		sk = _nltst_socket(NETLINK_ROUTE);
 		sk_free = sk;
@@ -244,4 +389,269 @@ void _nltst_add_link(struct nl_sock *sk, const char *ifname, const char *kind)
 
 	r = rtnl_link_add(sk, link, NLM_F_CREATE);
 	ck_assert_int_eq(r, 0);
+
+	if (!out_ifindex && _nltst_rand_u32_range(5) != 0)
+		return;
+
+	cache = _nltst_rtnl_link_alloc_cache(sk, AF_UNSPEC, 0);
+
+	link2 = _nltst_cache_get_link(cache, ifname);
+	ck_assert_ptr_nonnull(link2);
+
+	ifindex = rtnl_link_get_ifindex(link2);
+	ck_assert_int_gt(ifindex, 0);
+
+	if (out_ifindex)
+		*out_ifindex = ifindex;
+}
+
+void _nltst_delete_link(struct nl_sock *sk, const char *ifname)
+{
+	_nl_auto_nl_socket struct nl_sock *sk_free = NULL;
+	_nl_auto_rtnl_link struct rtnl_link *link = NULL;
+
+	_nltst_assert_link_exists(ifname);
+
+	if (!sk) {
+		sk = _nltst_socket(NETLINK_ROUTE);
+		sk_free = sk;
+	}
+
+	if (_nltst_rand_u32_range(5) == 0) {
+		_nl_auto_nl_cache struct nl_cache *cache = NULL;
+
+		cache = _nltst_rtnl_link_alloc_cache(sk, AF_UNSPEC, 0);
+		ck_assert_ptr_nonnull(_nltst_cache_get_link(cache, ifname));
+	}
+
+	link = rtnl_link_alloc();
+	ck_assert_ptr_nonnull(link);
+
+	rtnl_link_set_name(link, ifname);
+
+	_nltst_assert_retcode(rtnl_link_delete(sk, link));
+
+	_nltst_assert_link_not_exists(ifname);
+}
+
+void _nltst_get_link(struct nl_sock *sk, const char *ifname, int *out_ifindex,
+		     struct rtnl_link **out_link)
+{
+	_nl_auto_nl_cache struct nl_cache *cache = NULL;
+	struct rtnl_link *link;
+
+	if (_nltst_rand_u32_range(5) == 0)
+		_nltst_assert_link_exists(ifname);
+
+	cache = _nltst_rtnl_link_alloc_cache(sk, AF_UNSPEC, 0);
+
+	link = _nltst_cache_get_link(cache, ifname);
+	ck_assert(link);
+
+	if (out_ifindex)
+		*out_ifindex = rtnl_link_get_ifindex(link);
+
+	if (out_link) {
+		nl_object_get((struct nl_object *)link);
+		*out_link = link;
+	}
+}
+
+struct nl_cache *_nltst_rtnl_link_alloc_cache(struct nl_sock *sk,
+					      int addr_family, unsigned flags)
+{
+	_nl_auto_nl_socket struct nl_sock *sk_free = NULL;
+	struct nl_cache *cache;
+	int r;
+
+	if (!sk) {
+		sk = _nltst_socket(NETLINK_ROUTE);
+		sk_free = sk;
+	}
+
+	if (flags == 0 && _nltst_rand_bool())
+		r = rtnl_link_alloc_cache(sk, addr_family, &cache);
+	else
+		r = rtnl_link_alloc_cache_flags(sk, addr_family, &cache, flags);
+
+	_nltst_assert_retcode(r);
+
+	if (_nltst_rand_u32_range(5) == 0)
+		free(_nltst_cache_get_all(cache, NULL));
+
+	return _nltst_assert(cache);
+}
+
+struct nl_cache *_nltst_rtnl_route_alloc_cache(struct nl_sock *sk,
+					       int addr_family)
+{
+	struct nl_cache *cache;
+
+	ck_assert_ptr_nonnull(sk);
+	ck_assert(addr_family == AF_UNSPEC || addr_family == AF_INET ||
+		  addr_family == AF_INET6);
+
+	_nltst_assert_retcode(
+		rtnl_route_alloc_cache(sk, addr_family, 0, &cache));
+
+	if (_nltst_rand_u32_range(5) == 0)
+		free(_nltst_cache_get_all(cache, NULL));
+
+	return _nltst_assert(cache);
+}
+
+/*****************************************************************************/
+
+char *_nltst_strtok(const char **p_str)
+{
+	const char *str;
+	_nl_auto_free char *dst = NULL;
+	size_t dst_len = 0;
+	size_t dst_alloc = 0;
+	size_t i;
+
+	ck_assert_ptr_nonnull(p_str);
+
+	str = _nltst_str_skip_space(*p_str);
+
+	if (str[0] == '\0') {
+		*p_str = str;
+		return NULL;
+	}
+
+	dst_len = 0;
+	dst_alloc = 10;
+	dst = malloc(dst_alloc);
+	ck_assert_ptr_nonnull(dst);
+
+	i = 0;
+	while (true) {
+		char ch1 = '\0';
+		char ch2 = '\0';
+
+		/* We take the first word, up until whitespace. Note that backslash
+		 * escape is honored, so you can backslash escape spaces. The returned
+		 * string will NOT have backslashes removed. */
+
+		if (str[i] == '\0') {
+			*p_str = &str[i];
+			break;
+		}
+		if (_nltst_char_is_space(str[i])) {
+			*p_str = _nltst_str_skip_space(&str[i + 1]);
+			break;
+		}
+		ch1 = str[i];
+		if (str[i] == '\\') {
+			if (str[i + 1] != '\0') {
+				ch2 = str[i + 1];
+				i += 2;
+			} else
+				i += 1;
+		} else
+			i += 1;
+
+		if (dst_len + 3 >= dst_alloc) {
+			dst_alloc *= 2;
+			dst = realloc(dst, dst_alloc);
+			ck_assert_ptr_nonnull(dst);
+		}
+		dst[dst_len++] = ch1;
+		if (ch2 != '\0')
+			dst[dst_len++] = ch2;
+	}
+
+	ck_assert_int_gt(dst_len, 0);
+	return strndup(dst, dst_len);
+}
+
+char **_nltst_strtokv(const char *str)
+{
+	_nl_auto_free char *s = NULL;
+	_nltst_auto_strfreev char **result = NULL;
+	size_t r_len = 0;
+	size_t r_alloc = 0;
+
+	if (!str)
+		return NULL;
+
+	r_alloc = 4;
+	result = malloc(sizeof(char *) * r_alloc);
+	ck_assert_ptr_nonnull(result);
+
+	while ((s = _nltst_strtok(&str))) {
+		if (r_len + 2 >= r_alloc) {
+			r_alloc *= 2;
+			result = realloc(result, sizeof(char *) * r_alloc);
+			ck_assert_ptr_nonnull(result);
+		}
+		result[r_len++] = _nl_steal_pointer(&s);
+	}
+	ck_assert_int_lt(r_len, r_alloc);
+	result[r_len] = NULL;
+	return _nl_steal_pointer(&result);
+}
+
+/*****************************************************************************/
+
+void _nltst_assert_link_exists_full(const char *ifname, bool exists)
+{
+	_nl_auto_nl_cache struct nl_cache *cache = NULL;
+	_nl_auto_rtnl_link struct rtnl_link *link_clone = NULL;
+	struct rtnl_link *link;
+	char path[100];
+	struct stat st;
+	int rnd;
+	int r;
+
+	ck_assert_pstr_ne(ifname, NULL);
+	ck_assert_int_lt(strlen(ifname), IFNAMSIZ);
+
+	strcpy(path, "/sys/class/net/");
+	strcat(path, ifname);
+	ck_assert_int_lt(strlen(path), sizeof(path));
+
+	r = stat(path, &st);
+	if (exists) {
+		if (r != 0) {
+			const int errsv = (errno);
+
+			ck_assert_msg(
+				0,
+				"link(%s) does not exist (stat(%s) failed with r=%d, errno=%d (%s)",
+				ifname, path, r, errsv, strerror(errsv));
+		}
+	} else {
+		if (r != -1 && errno != ENOENT) {
+			const int errsv = (errno);
+
+			ck_assert_msg(
+				0,
+				"link(%s) should not exist but stat(%s) gave r=%d, errno=%d (%s)",
+				ifname, path, r, errsv, strerror(errsv));
+		}
+	}
+
+	rnd = _nltst_rand_u32_range(3);
+
+	if (rnd == 0)
+		return;
+
+	cache = _nltst_rtnl_link_alloc_cache(NULL, AF_UNSPEC, 0);
+
+	link = _nltst_cache_get_link(cache, ifname);
+	if (exists)
+		ck_assert_ptr_nonnull(link);
+	else
+		ck_assert_ptr_null(link);
+
+	if (!link || rnd == 1)
+		return;
+
+	link_clone =
+		(struct rtnl_link *)nl_object_clone((struct nl_object *)link);
+	ck_assert(link_clone);
+
+	/* FIXME: we would expect that the cloned object is identical. It is not. */
+	/* _nltst_object_identical(link, link_clone); */
 }
diff --git a/tests/nl-test-util.h b/tests/nl-test-util.h
index 259ab59..0ff9752 100644
--- a/tests/nl-test-util.h
+++ b/tests/nl-test-util.h
@@ -4,17 +4,102 @@
 #define __NL_TEST_UTIL_H__
 
 #include <errno.h>
+#include <sys/stat.h>
 #include <check.h>
+#include <string.h>
+#include <stdbool.h>
+#include <arpa/inet.h>
 
 #include "netlink/object.h"
 #include "netlink/cache.h"
 
+#include "netlink-private/nl-auto.h"
+#include "netlink-private/utils.h"
+
+/*****************************************************************************/
+
+static inline void _nltst_strfreev(char **strv)
+{
+	size_t i;
+
+	if (strv) {
+		for (i = 0; strv[i]; i++)
+			free(strv[i]);
+		free(strv);
+	}
+}
+
+#define _nltst_auto_strfreev _nl_auto(_nltst_auto_strfreev_fcn)
+_NL_AUTO_DEFINE_FCN_TYPED0(char **, _nltst_auto_strfreev_fcn, _nltst_strfreev);
+
 /*****************************************************************************/
 
 #ifndef ck_assert_ptr_nonnull
 #define ck_assert_ptr_nonnull(ptr) ck_assert(ptr)
 #endif
 
+#ifndef ck_assert_pstr_ne
+#define ck_assert_pstr_ne(a, b)                                                \
+	do {                                                                   \
+		const char *_a = (a);                                          \
+		const char *_b = (b);                                          \
+                                                                               \
+		ck_assert(!(_a == _b || (_a && _b && strcmp(_a, _b) == 0)));   \
+	} while (0)
+#endif
+
+#ifndef ck_assert_ptr_null
+#define ck_assert_ptr_null(ptr) ck_assert(!(ptr))
+#endif
+
+/*****************************************************************************/
+
+void _nltst_get_urandom(void *ptr, size_t len);
+
+uint32_t _nltst_rand_u32(void);
+
+static inline uint32_t _nltst_rand_u32_range(uint32_t n)
+{
+	uint32_t rem;
+	uint32_t i;
+
+	if (n == 0)
+		return _nltst_rand_u32();
+	if (n == 1)
+		return 0;
+
+	rem = UINT32_MAX % n;
+	for (;;) {
+		i = _nltst_rand_u32();
+		if (i < (UINT32_MAX - rem))
+			return i % n;
+	}
+}
+
+static inline bool _nltst_rand_bool(void)
+{
+	return _nltst_rand_u32() % 2 == 0;
+}
+
+#define _nltst_rand_select(a, ...)                                             \
+	({                                                                     \
+		const typeof(a) _lst[] = { (a), ##__VA_ARGS__ };               \
+                                                                               \
+		_lst[_nltst_rand_u32_range(_NL_N_ELEMENTS(_lst))];             \
+	})
+
+/*****************************************************************************/
+
+#define _nltst_assert(expr)                                                    \
+	({                                                                     \
+		typeof(expr) _expr = (expr);                                   \
+                                                                               \
+		if (!_expr) {                                                  \
+			ck_assert_msg(0, "assert(%s) failed", #expr);          \
+		}                                                              \
+		_expr;                                                         \
+	})
+
 #define _nltst_assert_errno(expr)                                              \
 	do {                                                                   \
 		if (expr) {                                                    \
@@ -26,6 +111,23 @@
 		}                                                              \
 	} while (0)
 
+#define _nltst_assert_retcode(expr)                                                   \
+	do {                                                                          \
+		const int _r = (expr);                                                \
+                                                                                      \
+		if (_r < 0) {                                                         \
+			ck_assert_msg(                                                \
+				0, "command(%s) failed with return code %d",          \
+				#expr, _r);                                           \
+		}                                                                     \
+		if (_r > 0) {                                                         \
+			ck_assert_msg(                                                \
+				0,                                                    \
+				"command(%s) has unexpected positive return code %d", \
+				#expr, _r);                                           \
+		}                                                                     \
+	} while (0)
+
 #define _nltst_close(fd)                                                       \
 	do {                                                                   \
 		int _r;                                                        \
@@ -42,6 +144,221 @@
 		_nltst_assert_errno(_r == 0);                                  \
 	} while (0)
 
+void _nltst_assert_link_exists_full(const char *ifname, bool exists);
+
+#define _nltst_assert_link_exists(ifname)                                      \
+	_nltst_assert_link_exists_full((ifname), true)
+
+#define _nltst_assert_link_not_exists(ifname)                                  \
+	_nltst_assert_link_exists_full((ifname), false)
+
+/*****************************************************************************/
+
+typedef union {
+	in_addr_t addr4;
+	struct in_addr a4;
+	struct in6_addr a6;
+} NLTstIPAddr;
+
+static inline char *_nltst_inet_ntop(int addr_family, const void *addr,
+				     char buf[static INET_ADDRSTRLEN])
+{
+	char *r;
+
+	ck_assert(addr_family == AF_INET || addr_family == AF_INET6);
+	ck_assert(addr);
+
+	r = (char *)inet_ntop(addr_family, addr, buf,
+			      (addr_family == AF_INET) ? INET_ADDRSTRLEN :
+							       INET6_ADDRSTRLEN);
+	ck_assert_ptr_eq(r, buf);
+	ck_assert_int_lt(strlen(r), (addr_family == AF_INET) ?
+					    INET_ADDRSTRLEN :
+						  INET6_ADDRSTRLEN);
+	return r;
+}
+
+static inline char *_nltst_inet_ntop_dup(int addr_family, const void *addr)
+{
+	return (char *)_nltst_inet_ntop(addr_family, addr,
+					malloc((addr_family == AF_INET) ?
+						       INET_ADDRSTRLEN :
+							     INET6_ADDRSTRLEN));
+}
+
+static inline bool _nltst_inet_pton(int addr_family, const char *str,
+				    int *out_addr_family, void *out_addr)
+{
+	NLTstIPAddr a;
+	int r;
+
+	ck_assert(addr_family == AF_UNSPEC || addr_family == AF_INET ||
+		  addr_family == AF_INET6);
+
+	/* when requesting @out_addr, then the addr-family must either be
+	 * pre-determined or requested too. */
+	ck_assert(!out_addr || out_addr_family || addr_family != AF_UNSPEC);
+
+	if (!str)
+		return false;
+
+	if (addr_family == AF_UNSPEC)
+		addr_family = strchr(str, ':') ? AF_INET6 : AF_INET;
+
+	r = inet_pton(addr_family, str, &a);
+	if (r != 1)
+		return false;
+
+	if (out_addr) {
+		memcpy(out_addr, &a,
+		       addr_family == AF_INET ? sizeof(in_addr_t) :
+						      sizeof(struct in6_addr));
+	}
+	if (out_addr_family)
+		*out_addr_family = addr_family;
+
+	return true;
+}
+
+static inline bool _nltst_inet_valid(int addr_family, const char *addr)
+{
+	return _nltst_inet_pton(addr_family, addr, NULL, NULL);
+}
+
+static inline in_addr_t _nltst_inet4(const char *addr)
+{
+	in_addr_t addr_bin = 0;
+
+	_nltst_assert(_nltst_inet_pton(AF_INET, addr, NULL, &addr_bin));
+	return addr_bin;
+}
+
+static inline struct in6_addr *_nltst_inet6p(const char *addr)
+{
+	_nl_thread_local static struct in6_addr addr_bin;
+
+	ck_assert(_nltst_inet_pton(AF_INET6, addr, NULL, &addr_bin));
+	return &addr_bin;
+}
+
+static inline struct in6_addr _nltst_inet6(const char *addr)
+{
+	struct in6_addr addr_bin;
+
+	ck_assert(_nltst_inet_pton(AF_INET6, addr, NULL, &addr_bin));
+	return addr_bin;
+}
+
+static inline int _nltst_inet_addr_family(int addr_family, const char *addr)
+{
+	if (!_nltst_inet_pton(addr_family, addr, &addr_family, NULL))
+		return AF_UNSPEC;
+	return addr_family;
+}
+
+static inline char *_nltst_inet_normalize(int addr_family, const char *addr,
+					  char buf[static INET_ADDRSTRLEN])
+{
+	NLTstIPAddr a;
+
+	buf[0] = '\0';
+	if (!_nltst_inet_pton(addr_family, addr, &addr_family, &a))
+		return NULL;
+	return _nltst_inet_ntop(addr_family, &a, buf);
+}
+
+/*****************************************************************************/
+
+char *_nltst_strtok(const char **p_str);
+
+char **_nltst_strtokv(const char *str);
+
+#define _nltst_assert_strv_equal(strv1, strv2)                                 \
+	do {                                                                   \
+		typeof(strv1) _strv1 = (strv1);                                \
+		typeof(strv2) _strv2 = (strv2);                                \
+		_nl_unused const void *_strv1_typecheck1 = _strv1;             \
+		_nl_unused const void *_strv2_typecheck1 = _strv2;             \
+		_nl_unused const char *_strv1_typecheck2 =                     \
+			_strv1 ? _strv1[0] : NULL;                             \
+		_nl_unused const char *_strv2_typecheck2 =                     \
+			_strv2 ? _strv2[0] : NULL;                             \
+		size_t _i;                                                     \
+                                                                               \
+		ck_assert_int_eq(!!_strv1, !!_strv2);                          \
+		if (_strv1) {                                                  \
+			for (_i = 0; _strv1[_i] || _strv2[_i]; _i++) {         \
+				ck_assert_str_eq(_strv1[_i], _strv2[_i]);      \
+			}                                                      \
+		}                                                              \
+	} while (0)
+
+#define _NLTST_CHARSET_SPACE " \n\r\t"
+
+#define _nltst_char_is(ch, charset) (!!(strchr("" charset "", (ch))))
+
+#define _nltst_char_is_space(ch) _nltst_char_is(ch, _NLTST_CHARSET_SPACE)
+
+#define _nltst_str_skip_predicate(s, ch, predicate)                            \
+	({                                                                     \
+		typeof(s) _s1 = (s);                                           \
+		_nl_unused const char *_s1_typecheck = (_s1);                  \
+                                                                               \
+		if (_s1) {                                                     \
+			while (({                                              \
+				const char ch = _s1[0];                        \
+                                                                               \
+				(ch != '\0') && (predicate);                   \
+			}))                                                    \
+				_s1++;                                         \
+		}                                                              \
+		_s1;                                                           \
+	})
+
+#define _nltst_str_skip_charset(s, charset)                                    \
+	_nltst_str_skip_predicate(s, _ch, _nltst_char_is(_ch, "" charset ""))
+
+#define _nltst_str_skip_space(s)                                               \
+	_nltst_str_skip_charset(s, _NLTST_CHARSET_SPACE)
+
+#define _nltst_str_has_prefix_and_space(s, prefix)                             \
+	({                                                                     \
+		typeof(s) _s2 = (s);                                           \
+		_nl_unused const char *_s2_typecheck = (_s2);                  \
+		const size_t _l = strlen("" prefix "");                        \
+                                                                               \
+		if (_s2) {                                                     \
+			if ((strncmp(_s2, "" prefix "", _l)) == 0 &&           \
+			    _nltst_char_is_space(_s2[_l]))                     \
+				_s2 = _nltst_str_skip_space(&_s2[_l + 1]);     \
+			else                                                   \
+				_s2 = NULL;                                    \
+		}                                                              \
+		_s2;                                                           \
+	})
+
+#define _nltst_str_find_first_not_from_charset(s, charset)                     \
+	({                                                                     \
+		typeof(s) _s3 = (s);                                           \
+		_nl_unused const char *_s3_typecheck = (_s3);                  \
+		size_t _l3;                                                    \
+                                                                               \
+		_l3 = strspn(_s3, "" charset "");                              \
+                                                                               \
+		&_s3[_l3];                                                     \
+	})
+
+#define _nltst_str_find_first_from_charset(s, charset)                         \
+	({                                                                     \
+		typeof(s) _s3 = (s);                                           \
+		_nl_unused const char *_s3_typecheck = (_s3);                  \
+		size_t _l3;                                                    \
+                                                                               \
+		_l3 = strcspn(_s3, "" charset "");                             \
+                                                                               \
+		&_s3[_l3];                                                     \
+	})
+
 /*****************************************************************************/
 
 void nltst_netns_fixture_setup(void);
@@ -56,11 +373,28 @@ void nltst_netns_leave(struct nltst_netns *nsdata);
 
 void _nltst_object_identical(const void *a, const void *b);
 
+char *_nltst_object_to_string(struct nl_object *obj);
+
 struct nl_object **_nltst_cache_get_all(struct nl_cache *cache,
 					size_t *out_len);
 
+struct rtnl_link *_nltst_cache_get_link(struct nl_cache *cache,
+					const char *ifname);
+
+struct nl_cache *_nltst_rtnl_link_alloc_cache(struct nl_sock *sk,
+					      int addr_family, unsigned flags);
+
+struct nl_cache *_nltst_rtnl_route_alloc_cache(struct nl_sock *sk,
+					       int addr_family);
+
 struct nl_sock *_nltst_socket(int protocol);
 
-void _nltst_add_link(struct nl_sock *sk, const char *ifname, const char *kind);
+void _nltst_add_link(struct nl_sock *sk, const char *ifname, const char *kind,
+		     int *out_ifindex);
+
+void _nltst_delete_link(struct nl_sock *sk, const char *ifname);
+
+void _nltst_get_link(struct nl_sock *sk, const char *ifname, int *out_ifindex,
+		     struct rtnl_link **out_link);
 
 #endif /* __NL_TEST_UTIL_H__ */