// Networking.cpp

//#include <cipres_config.h>

#if defined(_WIN32) || defined(_WIN64)

#define WIN32_LEAN_AND_MEAN

#include <windows.h>
#include <winsock2.h>

#elif defined(linux) || defined(__linux) || (defined(__APPLE__) && defined(__MACH__))

#include <unistd.h>
#include <netdb.h>

#endif

#include <new>
#include <cstring>
#include <boost/shared_array.hpp>
#include "ErrorHandling.hpp"
#include "cipres-jni.h"


#define MAX_HOSTNAME_LENGTH  255


using namespace CipresJNI;


// Java_org_cipres_jni_Networking_getShortHostname
jstring JNICALL Java_org_cipres_jni_Networking_getShortHostname(JNIEnv *env, jclass obj)
{
	try {
#if defined(_WIN32) || defined(_WIN64)

		WSADATA lib_data;

		if(::WSAStartup(MAKEWORD(1, 1), &lib_data) != 0) {
			ThrowSystemError(env, ::WSAGetLastError());

			return NULL;
		}

#endif

		boost::shared_array<char> hostname(new char[MAX_HOSTNAME_LENGTH + 1]);

		::gethostname(hostname.get(), MAX_HOSTNAME_LENGTH);

		// gethostname only consults local files, but gethostbyname will use
		//  the network for name resolution
		hostent *host_info = ::gethostbyname(hostname.get());

		if(host_info == NULL) {
#if defined(_WIN32) || defined(_WIN64)

			ThrowSystemError(env, ::WSAGetLastError());

#elif defined(linux) || defined(__linux) || (defined(__APPLE__) && defined(__MACH__))

			ThrowError(env, JAVA_CLASS_RUNTIME_EXCEPT, ::hstrerror(h_errno));

#endif

			return NULL;
		}

		// the first segment of the host name is used as the short name
		char *dot_char = std::strchr(host_info->h_name, '.');

		if(dot_char != NULL)
			*dot_char = '\0';

		jstring short_name = env->NewStringUTF(host_info->h_name);

#if defined(_WIN32) || defined(_WIN64)

		::WSACleanup();

#endif

		return short_name;
	}
	catch(const std::bad_alloc &) {
		ThrowOutOfMemError(env);

		return NULL;
	}
}