Flesh out <arpa/inet.h>.

Use the upstream OpenBSD implementations of these functions.

Also ensure we have symbols for htonl, htons, ntohl, and ntohs.
gtest doesn't like us using the macro versions in ASSERT_EQ.

Bug: 14840760
Change-Id: I68720e9aca14838df457d2bb27b999d5818ac2b5

tests/arpa_inet_test.cpp

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gtest/gtest.h>
+
+#include <arpa/inet.h>
+
+TEST(arpa_inet, inet_addr) {
+  ASSERT_EQ((htonl)(0x7f000001), inet_addr("127.0.0.1"));
+}
+
+TEST(arpa_inet, inet_aton) {
+  in_addr a;
+  ASSERT_EQ(1, inet_aton("127.0.0.1", &a));
+  ASSERT_EQ((htonl)(0x7f000001), a.s_addr);
+}
+
+TEST(arpa_inet, inet_lnaof) {
+  in_addr a = { htonl(0x12345678) };
+  ASSERT_EQ(0x00345678U, inet_lnaof(a));
+}
+
+TEST(arpa_inet, inet_makeaddr) {
+  in_addr a = inet_makeaddr(0x12U, 0x345678);
+  ASSERT_EQ((htonl)(0x12345678), a.s_addr);
+}
+
+TEST(arpa_inet, inet_netof) {
+  in_addr a = { htonl(0x12345678) };
+  ASSERT_EQ(0x12U, inet_netof(a));
+}
+
+TEST(arpa_inet, inet_network) {
+  ASSERT_EQ(0x7f000001U, inet_network("127.0.0.1"));
+}
+
+TEST(arpa_inet, inet_ntoa) {
+  in_addr a = { (htonl)(0x7f000001) };
+  ASSERT_STREQ("127.0.0.1", inet_ntoa(a));
+}
+
+TEST(arpa_inet, inet_pton__inet_ntop) {
+  sockaddr_storage ss;
+  ASSERT_EQ(1, inet_pton(AF_INET, "127.0.0.1", &ss));
+
+  char s[INET_ADDRSTRLEN];
+  ASSERT_STREQ("127.0.0.1", inet_ntop(AF_INET, &ss, s, INET_ADDRSTRLEN));
+}