1 files changed, 225 insertions, 0 deletions
diff --git a/plugins/check_users.cpp b/plugins/check_users.cpp
new file mode 100644
index 0000000..9193551
--- /dev/null
+++ b/plugins/check_users.cpp
@@ -0,0 +1,225 @@
+/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
+
+#include "plugins/thresholds.hpp"
+#include <boost/program_options.hpp>
+#include <iostream>
+#include <windows.h>
+#include <shlwapi.h>
+#include <wtsapi32.h>
+
+#define VERSION 1.0
+
+namespace po = boost::program_options;
+
+struct printInfoStruct
+{
+	threshold warn;
+	threshold crit;
+	DOUBLE users;
+};
+
+static bool l_Debug;
+
+static int parseArguments(int ac, WCHAR **av, po::variables_map& vm, printInfoStruct& printInfo)
+{
+	WCHAR namePath[MAX_PATH];
+	GetModuleFileName(NULL, namePath, MAX_PATH);
+	WCHAR *progName = PathFindFileName(namePath);
+
+	po::options_description desc;
+
+	desc.add_options()
+		("help,h", "Print help message and exit")
+		("version,V", "Print version and exit")
+		("debug,d", "Verbose/Debug output")
+		("warning,w", po::wvalue<std::wstring>(), "Warning threshold")
+		("critical,c", po::wvalue<std::wstring>(), "Critical threshold")
+		;
+
+	po::wcommand_line_parser parser(ac, av);
+
+	try {
+		po::store(
+			parser
+			.options(desc)
+			.style(
+				po::command_line_style::unix_style |
+				po::command_line_style::allow_long_disguise)
+			.run(),
+			vm);
+		vm.notify();
+	} catch (const std::exception& e) {
+		std::cout << e.what() << '\n' << desc << '\n';
+		return 3;
+	}
+
+	if (vm.count("help")) {
+		std::wcout << progName << " Help\n\tVersion: " << VERSION << '\n';
+		wprintf(
+			L"%s is a simple program to check a machines logged in users.\n"
+			L"You can use the following options to define its behaviour:\n\n", progName);
+		std::cout << desc;
+		wprintf(
+			L"\nIt will then output a string looking something like this:\n\n"
+			L"\tUSERS WARNING 48 | users=48;10;50;0\n\n"
+			L"\"USERS\" being the type of the check, \"WARNING\" the returned status\n"
+			L"and \"48\" is the returned value.\n"
+			L"The performance data is found behind the \"|\", in order:\n"
+			L"returned value, warning threshold, critical threshold, minimal value and,\n"
+			L"if applicable, the maximal value. Performance data will only be displayed when\n"
+			L"you set at least one threshold\n\n"
+			L"%s' exit codes denote the following:\n"
+			L" 0\tOK,\n\tNo Thresholds were broken or the programs check part was not executed\n"
+			L" 1\tWARNING,\n\tThe warning, but not the critical threshold was broken\n"
+			L" 2\tCRITICAL,\n\tThe critical threshold was broken\n"
+			L" 3\tUNKNOWN, \n\tThe program experienced an internal or input error\n\n"
+			L"Threshold syntax:\n\n"
+			L"-w THRESHOLD\n"
+			L"warn if threshold is broken, which means VALUE > THRESHOLD\n"
+			L"(unless stated differently)\n\n"
+			L"-w !THRESHOLD\n"
+			L"inverts threshold check, VALUE < THRESHOLD (analogous to above)\n\n"
+			L"-w [THR1-THR2]\n"
+			L"warn is VALUE is inside the range spanned by THR1 and THR2\n\n"
+			L"-w ![THR1-THR2]\n"
+			L"warn if VALUE is outside the range spanned by THR1 and THR2\n\n"
+			L"-w THRESHOLD%%\n"
+			L"if the plugin accepts percentage based thresholds those will be used.\n"
+			L"Does nothing if the plugin does not accept percentages, or only uses\n"
+			L"percentage thresholds. Ranges can be used with \"%%\", but both range values need\n"
+			L"to end with a percentage sign.\n\n"
+			L"All of these options work with the critical threshold \"-c\" too."
+			, progName);
+		std::cout << '\n';
+		return 0;
+	}
+
+	if (vm.count("version"))
+		std::wcout << L"Version: " << VERSION << '\n';
+
+	if (vm.count("warning")) {
+		try {
+			printInfo.warn = threshold(vm["warning"].as<std::wstring>());
+		} catch (const std::invalid_argument& e) {
+			std::cout << e.what() << '\n';
+			return 3;
+		}
+	}
+	if (vm.count("critical")) {
+		try {
+			printInfo.crit = threshold(vm["critical"].as<std::wstring>());
+		} catch (const std::invalid_argument& e) {
+			std::cout << e.what() << '\n';
+			return 3;
+		}
+	}
+
+	l_Debug = vm.count("debug") > 0;
+
+	return -1;
+}
+
+static int printOutput(printInfoStruct& printInfo)
+{
+	if (l_Debug)
+		std::wcout << L"Constructing output string" << '\n';
+
+	state state = OK;
+
+	if (printInfo.warn.rend(printInfo.users))
+		state = WARNING;
+
+	if (printInfo.crit.rend(printInfo.users))
+		state = CRITICAL;
+
+	switch (state) {
+	case OK:
+		std::wcout << L"USERS OK " << printInfo.users << L" User(s) logged in | 'users'=" << printInfo.users << L";"
+			<< printInfo.warn.pString() << L";" << printInfo.crit.pString() << L";0;" << '\n';
+		break;
+	case WARNING:
+		std::wcout << L"USERS WARNING " << printInfo.users << L" User(s) logged in | 'users'=" << printInfo.users << L";"
+			<< printInfo.warn.pString() << L";" << printInfo.crit.pString() << L";0;" << '\n';
+		break;
+	case CRITICAL:
+		std::wcout << L"USERS CRITICAL " << printInfo.users << L" User(s) logged in | 'users'=" << printInfo.users << L";"
+			<< printInfo.warn.pString() << L";" << printInfo.crit.pString() << L";0;" << '\n';
+		break;
+	}
+
+	return state;
+}
+
+static int check_users(printInfoStruct& printInfo)
+{
+	DOUBLE users = 0;
+	WTS_SESSION_INFOW *pSessionInfo = NULL;
+	DWORD count;
+	DWORD index;
+
+	if (l_Debug)
+		std::wcout << L"Trying to enumerate terminal sessions" << '\n';
+
+	if (!WTSEnumerateSessions(WTS_CURRENT_SERVER_HANDLE, 0, 1, &pSessionInfo, &count)) {
+		std::wcout << L"Failed to enumerate terminal sessions" << '\n';
+		printErrorInfo();
+		if (pSessionInfo)
+			WTSFreeMemory(pSessionInfo);
+		return 3;
+	}
+
+	if (l_Debug)
+		std::wcout << L"Got all sessions (" << count << L"), traversing and counting active ones" << '\n';
+
+	for (index = 0; index < count; index++) {
+		LPWSTR name;
+		DWORD size;
+		int len;
+
+		if (l_Debug)
+			std::wcout << L"Querrying session number " << index << '\n';
+
+		if (!WTSQuerySessionInformation(WTS_CURRENT_SERVER_HANDLE, pSessionInfo[index].SessionId,
+			WTSUserName, &name, &size))
+			continue;
+
+		if (l_Debug)
+			std::wcout << L"Found \"" << name << L"\". Checking whether it's a real session" << '\n';
+
+		len = lstrlenW(name);
+
+		WTSFreeMemory(name);
+
+		if (!len)
+			continue;
+
+		if (pSessionInfo[index].State == WTSActive || pSessionInfo[index].State == WTSDisconnected) {
+			users++;
+			if (l_Debug)
+				std::wcout << L"\"" << name << L"\" is a real session, counting it. Now " << users << '\n';
+		}
+	}
+
+	if (l_Debug)
+		std::wcout << "Finished coutning user sessions (" << users << "). Freeing memory and returning" << '\n';
+
+	WTSFreeMemory(pSessionInfo);
+	printInfo.users = users;
+	return -1;
+}
+
+int wmain(int argc, WCHAR **argv)
+{
+	printInfoStruct printInfo = { };
+	po::variables_map vm;
+
+	int ret = parseArguments(argc, argv, vm, printInfo);
+	if (ret != -1)
+		return ret;
+
+	ret = check_users(printInfo);
+	if (ret != -1)
+		return ret;
+
+	return printOutput(printInfo);
+}