in-addr-util: add new helper call in_addr_prefix_from_string_auto()

This is much like in_addr_prefix_from_string(), but automatically
determines whether IPv4 or IPv6 addresses are specified. Also adds a
test for it.

1 files changed, 75 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 0000000000..8b7a1229fe
--- /dev/null
+++ b/src/test/test-in-addr-util.c
@@ -0,0 +1,75 @@
+/***
+  This file is part of systemd
+
+  Copyright 2017 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <netinet/in.h>
+
+#include "in-addr-util.h"
+
+static void test_in_addr_prefix_from_string(const char *p, int family, int ret, const union in_addr_union *u, unsigned char prefixlen) {
+        union in_addr_union q;
+        unsigned char l;
+        int r;
+
+        r = in_addr_prefix_from_string(p, family, &q, &l);
+        assert_se(r == ret);
+
+        if (r >= 0) {
+                int f;
+
+                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);
+        }
+}
+
+int main(int argc, char *argv[]) {
+        test_in_addr_prefix_from_string("", AF_INET, -EINVAL, NULL, 0);
+        test_in_addr_prefix_from_string("/", AF_INET, -EINVAL, NULL, 0);
+        test_in_addr_prefix_from_string("/8", AF_INET, -EINVAL, NULL, 0);
+        test_in_addr_prefix_from_string("1.2.3.4", AF_INET, 0, &(union in_addr_union) { .in = (struct in_addr) { .s_addr = htobe32(0x01020304) } }, 32);
+        test_in_addr_prefix_from_string("1.2.3.4/0", AF_INET, 0, &(union in_addr_union) { .in = (struct in_addr) { .s_addr = htobe32(0x01020304) } }, 0);
+        test_in_addr_prefix_from_string("1.2.3.4/1", AF_INET, 0, &(union in_addr_union) { .in = (struct in_addr) { .s_addr = htobe32(0x01020304) } }, 1);
+        test_in_addr_prefix_from_string("1.2.3.4/2", AF_INET, 0, &(union in_addr_union) { .in = (struct in_addr) { .s_addr = htobe32(0x01020304) } }, 2);
+        test_in_addr_prefix_from_string("1.2.3.4/32", AF_INET, 0, &(union in_addr_union) { .in = (struct in_addr) { .s_addr = htobe32(0x01020304) } }, 32);
+        test_in_addr_prefix_from_string("1.2.3.4/33", AF_INET, -ERANGE, NULL, 0);
+        test_in_addr_prefix_from_string("1.2.3.4/-1", AF_INET, -ERANGE, NULL, 0);
+        test_in_addr_prefix_from_string("::1", AF_INET, -EINVAL, NULL, 0);
+
+        test_in_addr_prefix_from_string("", AF_INET6, -EINVAL, NULL, 0);
+        test_in_addr_prefix_from_string("/", AF_INET6, -EINVAL, NULL, 0);
+        test_in_addr_prefix_from_string("/8", AF_INET6, -EINVAL, NULL, 0);
+        test_in_addr_prefix_from_string("::1", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 128);
+        test_in_addr_prefix_from_string("::1/0", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 0);
+        test_in_addr_prefix_from_string("::1/1", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 1);
+        test_in_addr_prefix_from_string("::1/2", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 2);
+        test_in_addr_prefix_from_string("::1/32", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 32);
+        test_in_addr_prefix_from_string("::1/33", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 33);
+        test_in_addr_prefix_from_string("::1/64", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 64);
+        test_in_addr_prefix_from_string("::1/128", AF_INET6, 0, &(union in_addr_union) { .in6 = IN6ADDR_LOOPBACK_INIT }, 128);
+        test_in_addr_prefix_from_string("::1/129", AF_INET6, -ERANGE, NULL, 0);
+        test_in_addr_prefix_from_string("::1/-1", AF_INET6, -ERANGE, NULL, 0);
+
+        return 0;
+}