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/*
* Copyright (c) 2014 Kevin Smith and Remko Tronçon
* Licensed under the GNU General Public License v3.
* See Documentation/Licenses/GPLv3.txt for more information.
*/
#include "dns_android.h"
#include <vector>
#include <string>
#include <jni.h>
JavaVM* javaVM = 0;
JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* /*aReserved*/) {
javaVM = vm;
return JNI_VERSION_1_6;
}
std::vector<std::string> get_servers() {
std::vector<std::string> servers;
JNIEnv* env = 0;
int result = javaVM->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6);
if (result == JNI_EDETACHED) {
if (javaVM->AttachCurrentThread(&env, 0) != 0) {
return servers;
}
} else if (result != JNI_OK) {
return servers;
}
jclass systemProperties = env->FindClass("android.os.SystemProperties");
if (!systemProperties) {
return servers;
}
jmethodID method = env->GetStaticMethodID(systemProperties, "get", "(Ljava/lang/String;)Ljava/lang/String;");
if (!method) {
return servers;
}
const char* parameters[] = {
"net.dns1",
"net.dns2",
"net.dns3",
"net.dns4"
};
for (size_t i = 0; i < sizeof(parameters)/sizeof(*parameters); ++i) {
jstring parameter = env->NewStringUTF(parameters[i]);
jstring value = jstring(env->CallStaticObjectMethod(systemProperties, method, parameter));
const char* server = env->GetStringUTFChars(value, JNI_FALSE);
if (strcmp(server, "")) {
servers.push_back(server);
}
env->ReleaseStringUTFChars(value, server);
}
return servers;
}
size_t dns_android_server_count() {
std::vector<std::string> servers = get_servers();
return servers.size();
}
dns_android_result dns_android_server_get(size_t index, char* buffer, size_t length) {
std::vector<std::string> servers = get_servers();
if (index >= servers.size()) {
return DNS_ANDROID_FAILURE; /* invalid server index */
}
if (length < servers[index].length() + 1) {
return DNS_ANDROID_FAILURE; /* insufficient buffer space */
}
strncpy(buffer, servers[index].c_str(), length);
return DNS_ANDROID_SUCCESS;
}
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Swift