icinga2/lib/icinga/macroprocessor.cpp

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/******************************************************************************
* Icinga 2 *
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* Copyright (C) 2012-2015 Icinga Development Team (http://www.icinga.org) *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation; either version 2 *
* of the License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software Foundation *
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
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#include "icinga/macroprocessor.hpp"
#include "icinga/macroresolver.hpp"
#include "icinga/customvarobject.hpp"
#include "base/array.hpp"
#include "base/objectlock.hpp"
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#include "base/logger.hpp"
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#include "base/context.hpp"
#include "base/dynamicobject.hpp"
#include "base/scriptframe.hpp"
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#include <boost/foreach.hpp>
#include <boost/algorithm/string/split.hpp>
#include <boost/algorithm/string/join.hpp>
#include <boost/algorithm/string/classification.hpp>
using namespace icinga;
Value MacroProcessor::ResolveMacros(const Value& str, const ResolverList& resolvers,
const CheckResult::Ptr& cr, String *missingMacro,
const MacroProcessor::EscapeCallback& escapeFn, const Dictionary::Ptr& resolvedMacros,
bool useResolvedMacros)
{
Value result;
if (str.IsEmpty())
return Empty;
if (str.IsScalar()) {
result = InternalResolveMacros(str, resolvers, cr, missingMacro, escapeFn,
resolvedMacros, useResolvedMacros);
} else if (str.IsObjectType<Array>()) {
Array::Ptr resultArr = new Array();
Array::Ptr arr = str;
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ObjectLock olock(arr);
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BOOST_FOREACH(const Value& arg, arr) {
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/* Note: don't escape macros here. */
resultArr->Add(InternalResolveMacros(arg, resolvers, cr, missingMacro,
EscapeCallback(), resolvedMacros, useResolvedMacros));
}
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result = resultArr;
} else if (str.IsObjectType<Dictionary>()) {
Dictionary::Ptr resultDict = new Dictionary();
Dictionary::Ptr dict = str;
ObjectLock olock(dict);
BOOST_FOREACH(const Dictionary::Pair& kv, dict) {
/* Note: don't escape macros here. */
resultDict->Set(kv.first, InternalResolveMacros(kv.second, resolvers, cr, missingMacro,
EscapeCallback(), resolvedMacros, useResolvedMacros));
}
result = resultDict;
} else if (str.IsObjectType<Function>()) {
result = EvaluateFunction(str, resolvers, cr, missingMacro, escapeFn, resolvedMacros, useResolvedMacros, 0);
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} else {
BOOST_THROW_EXCEPTION(std::invalid_argument("Macro is not a string or array."));
}
return result;
}
bool MacroProcessor::ResolveMacro(const String& macro, const ResolverList& resolvers,
const CheckResult::Ptr& cr, Value *result, bool *recursive_macro)
{
CONTEXT("Resolving macro '" + macro + "'");
*recursive_macro = false;
std::vector<String> tokens;
boost::algorithm::split(tokens, macro, boost::is_any_of("."));
String objName;
if (tokens.size() > 1) {
objName = tokens[0];
tokens.erase(tokens.begin());
}
BOOST_FOREACH(const ResolverSpec& resolver, resolvers) {
if (!objName.IsEmpty() && objName != resolver.first)
continue;
if (objName.IsEmpty()) {
CustomVarObject::Ptr dobj = dynamic_pointer_cast<CustomVarObject>(resolver.second);
if (dobj) {
Dictionary::Ptr vars = dobj->GetVars();
if (vars && vars->Contains(macro)) {
*result = vars->Get(macro);
*recursive_macro = true;
return true;
}
}
}
MacroResolver *mresolver = dynamic_cast<MacroResolver *>(resolver.second.get());
if (mresolver && mresolver->ResolveMacro(boost::algorithm::join(tokens, "."), cr, result))
return true;
Value ref = resolver.second;
bool valid = true;
BOOST_FOREACH(const String& token, tokens) {
if (ref.IsObjectType<Dictionary>()) {
Dictionary::Ptr dict = ref;
if (dict->Contains(token)) {
ref = dict->Get(token);
continue;
} else {
valid = false;
break;
}
} else if (ref.IsObject()) {
Object::Ptr object = ref;
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Type::Ptr type = object->GetReflectionType();
if (!type) {
valid = false;
break;
}
int field = type->GetFieldId(token);
if (field == -1) {
valid = false;
break;
}
ref = object->GetField(field);
}
}
if (valid) {
if (tokens[0] == "vars" ||
tokens[0] == "action_url" ||
tokens[0] == "notes_url" ||
tokens[0] == "notes")
*recursive_macro = true;
*result = ref;
return true;
}
}
return false;
}
Value MacroProcessor::InternalResolveMacrosShim(const std::vector<Value>& args, const ResolverList& resolvers,
const CheckResult::Ptr& cr, String *missingMacro,
const MacroProcessor::EscapeCallback& escapeFn, const Dictionary::Ptr& resolvedMacros,
bool useResolvedMacros, int recursionLevel)
{
if (args.size() < 1)
BOOST_THROW_EXCEPTION(std::invalid_argument("Too few arguments for function"));
return MacroProcessor::InternalResolveMacros(args[0], resolvers, cr, missingMacro, escapeFn,
resolvedMacros, useResolvedMacros, recursionLevel);
}
Value MacroProcessor::EvaluateFunction(const Function::Ptr& func, const ResolverList& resolvers,
const CheckResult::Ptr& cr, String *missingMacro,
const MacroProcessor::EscapeCallback& escapeFn, const Dictionary::Ptr& resolvedMacros,
bool useResolvedMacros, int recursionLevel)
{
Dictionary::Ptr resolvers_this = new Dictionary();
BOOST_FOREACH(const ResolverSpec& resolver, resolvers) {
resolvers_this->Set(resolver.first, resolver.second);
}
resolvers_this->Set("macro", new Function(boost::bind(&MacroProcessor::InternalResolveMacrosShim,
_1, boost::cref(resolvers), cr, missingMacro, MacroProcessor::EscapeCallback(), resolvedMacros, useResolvedMacros,
recursionLevel)));
ScriptFrame frame(resolvers_this);
return func->Invoke();
}
Value MacroProcessor::InternalResolveMacros(const String& str, const ResolverList& resolvers,
const CheckResult::Ptr& cr, String *missingMacro,
const MacroProcessor::EscapeCallback& escapeFn, const Dictionary::Ptr& resolvedMacros,
bool useResolvedMacros, int recursionLevel)
{
CONTEXT("Resolving macros for string '" + str + "'");
if (recursionLevel > 15)
BOOST_THROW_EXCEPTION(std::runtime_error("Infinite recursion detected while resolving macros"));
size_t offset, pos_first, pos_second;
offset = 0;
Dictionary::Ptr resolvers_this;
String result = str;
while ((pos_first = result.FindFirstOf("$", offset)) != String::NPos) {
pos_second = result.FindFirstOf("$", pos_first + 1);
if (pos_second == String::NPos)
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BOOST_THROW_EXCEPTION(std::runtime_error("Closing $ not found in macro format string."));
String name = result.SubStr(pos_first + 1, pos_second - pos_first - 1);
Value resolved_macro;
bool recursive_macro;
bool found;
if (useResolvedMacros) {
recursive_macro = false;
found = resolvedMacros->Contains(name);
if (found)
resolved_macro = resolvedMacros->Get(name);
} else
found = ResolveMacro(name, resolvers, cr, &resolved_macro, &recursive_macro);
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/* $$ is an escape sequence for $. */
if (name.IsEmpty()) {
resolved_macro = "$";
found = true;
}
if (resolved_macro.IsObjectType<Function>()) {
resolved_macro = EvaluateFunction(resolved_macro, resolvers, cr, missingMacro, escapeFn,
resolvedMacros, useResolvedMacros, recursionLevel);
}
if (!found) {
if (!missingMacro)
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Log(LogWarning, "MacroProcessor")
<< "Macro '" << name << "' is not defined.";
else
*missingMacro = name;
}
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/* recursively resolve macros in the macro if it was a user macro */
if (recursive_macro) {
if (resolved_macro.IsObjectType<Array>()) {
Array::Ptr arr = resolved_macro;
Array::Ptr resolved_arr = new Array();
ObjectLock olock(arr);
BOOST_FOREACH(const Value& value, arr) {
if (value.IsScalar()) {
resolved_arr->Add(InternalResolveMacros(value,
resolvers, cr, missingMacro, EscapeCallback(), Dictionary::Ptr(),
false, recursionLevel + 1));
} else
resolved_arr->Add(value);
}
resolved_macro = resolved_arr;
} else
resolved_macro = InternalResolveMacros(resolved_macro,
resolvers, cr, missingMacro, EscapeCallback(), Dictionary::Ptr(),
false, recursionLevel + 1);
}
if (!useResolvedMacros && found && resolvedMacros)
resolvedMacros->Set(name, resolved_macro);
if (escapeFn)
resolved_macro = escapeFn(resolved_macro);
/* we're done if the value is an array */
if (resolved_macro.IsObjectType<Array>()) {
/* don't allow mixing strings and arrays in macro strings */
if (pos_first != 0 || pos_second != str.GetLength() - 1)
BOOST_THROW_EXCEPTION(std::invalid_argument("Mixing both strings and non-strings in macros is not allowed."));
return resolved_macro;
}
String resolved_macro_str = resolved_macro;
result.Replace(pos_first, pos_second - pos_first + 1, resolved_macro_str);
offset = pos_first + resolved_macro_str.GetLength();
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}
return result;
}
bool MacroProcessor::ValidateMacroString(const String& macro)
{
if (macro.IsEmpty())
return true;
size_t pos_first, pos_second, offset;
offset = 0;
while((pos_first = macro.FindFirstOf("$", offset)) != String::NPos) {
pos_second = macro.FindFirstOf("$", pos_first + 1);
if (pos_second == String::NPos)
return false;
offset = pos_second + 1;
}
return true;
}