--- /dev/null
+/* Copyright (C) 2017 by John Schember <john@nachtimwald.com>
+ *
+ * Permission to use, copy, modify, and distribute this
+ * software and its documentation for any purpose and without
+ * fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting
+ * documentation, and that the name of M.I.T. not be used in
+ * advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose. It is provided "as is"
+ * without express or implied warranty.
+ */
+#if defined(ANDROID) || defined(__ANDROID__)
+
+#include <jni.h>
+
+#include "ares_setup.h"
+#include "ares.h"
+#include "ares_android.h"
+#include "ares_private.h"
+
+static JavaVM *android_jvm = NULL;
+static jobject android_connectivity_manager = NULL;
+
+/* ConnectivityManager.getActiveNetwork */
+static jmethodID android_cm_active_net_mid = NULL;
+/* ConnectivityManager.getLinkProperties */
+static jmethodID android_cm_link_props_mid = NULL;
+/* LinkProperties.getDnsServers */
+static jmethodID android_lp_dns_servers_mid = NULL;
+/* LinkProperties.getDomains */
+static jmethodID android_lp_domains_mid = NULL;
+/* List.size */
+static jmethodID android_list_size_mid = NULL;
+/* List.get */
+static jmethodID android_list_get_mid = NULL;
+/* InetAddress.getHostAddress */
+static jmethodID android_ia_host_addr_mid = NULL;
+
+static jclass jni_get_class(JNIEnv *env, const char *path)
+{
+ jclass cls = NULL;
+
+ if (env == NULL || path == NULL || *path == '\0')
+ return NULL;
+
+ cls = (*env)->FindClass(env, path);
+ if ((*env)->ExceptionOccurred(env)) {
+ (*env)->ExceptionClear(env);
+ return NULL;
+ }
+ return cls;
+}
+
+static jmethodID jni_get_method_id(JNIEnv *env, jclass cls,
+ const char *func_name, const char *signature)
+{
+ jmethodID mid = NULL;
+
+ if (env == NULL || cls == NULL || func_name == NULL || *func_name == '\0' ||
+ signature == NULL || *signature == '\0')
+ {
+ return NULL;
+ }
+
+ mid = (*env)->GetMethodID(env, cls, func_name, signature);
+ if ((*env)->ExceptionOccurred(env))
+ {
+ (*env)->ExceptionClear(env);
+ return NULL;
+ }
+
+ return mid;
+}
+
+void ares_library_init_jvm(JavaVM *jvm)
+{
+ android_jvm = jvm;
+}
+
+int ares_library_init_android(jobject connectivity_manager)
+{
+ JNIEnv *env = NULL;
+ int need_detatch = 0;
+ int res;
+ int ret = ARES_ENOTINITIALIZED;
+ jclass obj_cls = NULL;
+
+ if (android_jvm == NULL)
+ goto cleanup;
+
+ res = (*android_jvm)->GetEnv(android_jvm, (void **)&env, JNI_VERSION_1_6);
+ if (res == JNI_EDETACHED)
+ {
+ env = NULL;
+ res = (*android_jvm)->AttachCurrentThread(android_jvm, &env, NULL);
+ need_detatch = 1;
+ }
+ if (res != JNI_OK || env == NULL)
+ goto cleanup;
+
+ android_connectivity_manager =
+ (*env)->NewGlobalRef(env, connectivity_manager);
+ if (android_connectivity_manager == NULL)
+ goto cleanup;
+
+ /* Initialization has succeeded. Now attempt to cache the methods that will be
+ * called by ares_get_android_server_list. */
+ ret = ARES_SUCCESS;
+
+ /* ConnectivityManager in API 1. */
+ obj_cls = jni_get_class(env, "android/net/ConnectivityManager");
+ if (obj_cls == NULL)
+ goto cleanup;
+
+ /* ConnectivityManager.getActiveNetwork in API 23. */
+ android_cm_active_net_mid =
+ jni_get_method_id(env, obj_cls, "getActiveNetwork",
+ "()Landroid/net/Network;");
+ if (android_cm_active_net_mid == NULL)
+ goto cleanup;
+
+ /* ConnectivityManager.getLinkProperties in API 21. */
+ android_cm_link_props_mid =
+ jni_get_method_id(env, obj_cls, "getLinkProperties",
+ "(Landroid/net/Network;)Landroid/net/LinkProperties;");
+ if (android_cm_link_props_mid == NULL)
+ goto cleanup;
+
+ /* LinkProperties in API 21. */
+ (*env)->DeleteLocalRef(env, obj_cls);
+ obj_cls = jni_get_class(env, "android/net/LinkProperties");
+ if (obj_cls == NULL)
+ goto cleanup;
+
+ /* getDnsServers in API 21. */
+ android_lp_dns_servers_mid = jni_get_method_id(env, obj_cls, "getDnsServers",
+ "()Ljava/util/List;");
+ if (android_lp_dns_servers_mid == NULL)
+ goto cleanup;
+
+ /* getDomains in API 21. */
+ android_lp_domains_mid = jni_get_method_id(env, obj_cls, "getDomains",
+ "()Ljava/lang/String;");
+ if (android_lp_domains_mid == NULL)
+ goto cleanup;
+
+ (*env)->DeleteLocalRef(env, obj_cls);
+ obj_cls = jni_get_class(env, "java/util/List");
+ if (obj_cls == NULL)
+ goto cleanup;
+
+ android_list_size_mid = jni_get_method_id(env, obj_cls, "size", "()I");
+ if (android_list_size_mid == NULL)
+ goto cleanup;
+
+ android_list_get_mid = jni_get_method_id(env, obj_cls, "get",
+ "(I)Ljava/lang/Object;");
+ if (android_list_get_mid == NULL)
+ goto cleanup;
+
+ (*env)->DeleteLocalRef(env, obj_cls);
+ obj_cls = jni_get_class(env, "java/net/InetAddress");
+ if (obj_cls == NULL)
+ goto cleanup;
+
+ android_ia_host_addr_mid = jni_get_method_id(env, obj_cls, "getHostAddress",
+ "()Ljava/lang/String;");
+ if (android_ia_host_addr_mid == NULL)
+ goto cleanup;
+
+ (*env)->DeleteLocalRef(env, obj_cls);
+ goto done;
+
+cleanup:
+ if (obj_cls != NULL)
+ (*env)->DeleteLocalRef(env, obj_cls);
+
+ android_cm_active_net_mid = NULL;
+ android_cm_link_props_mid = NULL;
+ android_lp_dns_servers_mid = NULL;
+ android_lp_domains_mid = NULL;
+ android_list_size_mid = NULL;
+ android_list_get_mid = NULL;
+ android_ia_host_addr_mid = NULL;
+
+done:
+ if (need_detatch)
+ (*android_jvm)->DetachCurrentThread(android_jvm);
+
+ return ret;
+}
+
+int ares_library_android_initialized(void)
+{
+ if (android_jvm == NULL || android_connectivity_manager == NULL)
+ return ARES_ENOTINITIALIZED;
+ return ARES_SUCCESS;
+}
+
+void ares_library_cleanup_android(void)
+{
+ JNIEnv *env = NULL;
+ int need_detatch = 0;
+ int res;
+
+ if (android_jvm == NULL || android_connectivity_manager == NULL)
+ return;
+
+ res = (*android_jvm)->GetEnv(android_jvm, (void **)&env, JNI_VERSION_1_6);
+ if (res == JNI_EDETACHED)
+ {
+ env = NULL;
+ res = (*android_jvm)->AttachCurrentThread(android_jvm, &env, NULL);
+ need_detatch = 1;
+ }
+ if (res != JNI_OK || env == NULL)
+ return;
+
+ android_cm_active_net_mid = NULL;
+ android_cm_link_props_mid = NULL;
+ android_lp_dns_servers_mid = NULL;
+ android_lp_domains_mid = NULL;
+ android_list_size_mid = NULL;
+ android_list_get_mid = NULL;
+ android_ia_host_addr_mid = NULL;
+
+ (*env)->DeleteGlobalRef(env, android_connectivity_manager);
+ android_connectivity_manager = NULL;
+
+ if (need_detatch)
+ (*android_jvm)->DetachCurrentThread(android_jvm);
+}
+
+char **ares_get_android_server_list(size_t max_servers,
+ size_t *num_servers)
+{
+ JNIEnv *env = NULL;
+ jobject active_network = NULL;
+ jobject link_properties = NULL;
+ jobject server_list = NULL;
+ jobject server = NULL;
+ jstring str = NULL;
+ jint nserv;
+ const char *ch_server_address;
+ int res;
+ size_t i;
+ char **dns_list = NULL;
+ int need_detatch = 0;
+
+ if (android_jvm == NULL || android_connectivity_manager == NULL ||
+ max_servers == 0 || num_servers == NULL)
+ {
+ return NULL;
+ }
+
+ if (android_cm_active_net_mid == NULL || android_cm_link_props_mid == NULL ||
+ android_lp_dns_servers_mid == NULL || android_list_size_mid == NULL ||
+ android_list_get_mid == NULL || android_ia_host_addr_mid == NULL)
+ {
+ return NULL;
+ }
+
+ res = (*android_jvm)->GetEnv(android_jvm, (void **)&env, JNI_VERSION_1_6);
+ if (res == JNI_EDETACHED)
+ {
+ env = NULL;
+ res = (*android_jvm)->AttachCurrentThread(android_jvm, &env, NULL);
+ need_detatch = 1;
+ }
+ if (res != JNI_OK || env == NULL)
+ goto done;
+
+ /* JNI below is equivalent to this Java code.
+ import android.content.Context;
+ import android.net.ConnectivityManager;
+ import android.net.LinkProperties;
+ import android.net.Network;
+ import java.net.InetAddress;
+ import java.util.List;
+
+ ConnectivityManager cm = (ConnectivityManager)this.getApplicationContext()
+ .getSystemService(Context.CONNECTIVITY_SERVICE);
+ Network an = cm.getActiveNetwork();
+ LinkProperties lp = cm.getLinkProperties(an);
+ List<InetAddress> dns = lp.getDnsServers();
+ for (InetAddress ia: dns) {
+ String ha = ia.getHostAddress();
+ }
+
+ Note: The JNI ConnectivityManager object and all method IDs were previously
+ initialized in ares_library_init_android.
+ */
+
+ active_network = (*env)->CallObjectMethod(env, android_connectivity_manager,
+ android_cm_active_net_mid);
+ if (active_network == NULL)
+ goto done;
+
+ link_properties =
+ (*env)->CallObjectMethod(env, android_connectivity_manager,
+ android_cm_link_props_mid, active_network);
+ if (link_properties == NULL)
+ goto done;
+
+ server_list = (*env)->CallObjectMethod(env, link_properties,
+ android_lp_dns_servers_mid);
+ if (server_list == NULL)
+ goto done;
+
+ nserv = (*env)->CallIntMethod(env, server_list, android_list_size_mid);
+ if (nserv > (jint)max_servers)
+ nserv = (jint)max_servers;
+ if (nserv <= 0)
+ goto done;
+ *num_servers = (size_t)nserv;
+
+ dns_list = ares_malloc(sizeof(*dns_list)*(*num_servers));
+ for (i=0; i<*num_servers; i++)
+ {
+ server = (*env)->CallObjectMethod(env, server_list, android_list_get_mid,
+ (jint)i);
+ dns_list[i] = ares_malloc(64);
+ dns_list[i][0] = 0;
+ if (server == NULL)
+ {
+ continue;
+ }
+ str = (*env)->CallObjectMethod(env, server, android_ia_host_addr_mid);
+ ch_server_address = (*env)->GetStringUTFChars(env, str, 0);
+ strncpy(dns_list[i], ch_server_address, 64);
+ (*env)->ReleaseStringUTFChars(env, str, ch_server_address);
+ (*env)->DeleteLocalRef(env, str);
+ (*env)->DeleteLocalRef(env, server);
+ }
+
+done:
+ if ((*env)->ExceptionOccurred(env))
+ (*env)->ExceptionClear(env);
+
+ if (server_list != NULL)
+ (*env)->DeleteLocalRef(env, server_list);
+ if (link_properties != NULL)
+ (*env)->DeleteLocalRef(env, link_properties);
+ if (active_network != NULL)
+ (*env)->DeleteLocalRef(env, active_network);
+
+ if (need_detatch)
+ (*android_jvm)->DetachCurrentThread(android_jvm);
+ return dns_list;
+}
+
+char *ares_get_android_search_domains_list(void)
+{
+ JNIEnv *env = NULL;
+ jobject active_network = NULL;
+ jobject link_properties = NULL;
+ jstring domains = NULL;
+ const char *domain;
+ int res;
+ size_t i;
+ size_t cnt = 0;
+ char *domain_list = NULL;
+ int need_detatch = 0;
+
+ if (android_jvm == NULL || android_connectivity_manager == NULL)
+ {
+ return NULL;
+ }
+
+ if (android_cm_active_net_mid == NULL || android_cm_link_props_mid == NULL ||
+ android_lp_domains_mid == NULL)
+ {
+ return NULL;
+ }
+
+ res = (*android_jvm)->GetEnv(android_jvm, (void **)&env, JNI_VERSION_1_6);
+ if (res == JNI_EDETACHED)
+ {
+ env = NULL;
+ res = (*android_jvm)->AttachCurrentThread(android_jvm, &env, NULL);
+ need_detatch = 1;
+ }
+ if (res != JNI_OK || env == NULL)
+ goto done;
+
+ /* JNI below is equivalent to this Java code.
+ import android.content.Context;
+ import android.net.ConnectivityManager;
+ import android.net.LinkProperties;
+
+ ConnectivityManager cm = (ConnectivityManager)this.getApplicationContext()
+ .getSystemService(Context.CONNECTIVITY_SERVICE);
+ Network an = cm.getActiveNetwork();
+ LinkProperties lp = cm.getLinkProperties(an);
+ String domains = lp.getDomains();
+ for (String domain: domains.split(",")) {
+ String d = domain;
+ }
+
+ Note: The JNI ConnectivityManager object and all method IDs were previously
+ initialized in ares_library_init_android.
+ */
+
+ active_network = (*env)->CallObjectMethod(env, android_connectivity_manager,
+ android_cm_active_net_mid);
+ if (active_network == NULL)
+ goto done;
+
+ link_properties =
+ (*env)->CallObjectMethod(env, android_connectivity_manager,
+ android_cm_link_props_mid, active_network);
+ if (link_properties == NULL)
+ goto done;
+
+ /* Get the domains. It is a common separated list of domains to search. */
+ domains = (*env)->CallObjectMethod(env, link_properties,
+ android_lp_domains_mid);
+ if (domains == NULL)
+ goto done;
+
+ /* Split on , */
+ domain = (*env)->GetStringUTFChars(env, domains, 0);
+ domain_list = ares_strdup(domain);
+ (*env)->ReleaseStringUTFChars(env, domains, domain);
+ (*env)->DeleteLocalRef(env, domains);
+
+done:
+ if ((*env)->ExceptionOccurred(env))
+ (*env)->ExceptionClear(env);
+
+ if (link_properties != NULL)
+ (*env)->DeleteLocalRef(env, link_properties);
+ if (active_network != NULL)
+ (*env)->DeleteLocalRef(env, active_network);
+
+ if (need_detatch)
+ (*android_jvm)->DetachCurrentThread(android_jvm);
+ return domain_list;
+}
+#else
+/* warning: ISO C forbids an empty translation unit */
+typedef int dummy_make_iso_compilers_happy;
+#endif
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