icinga2/lib/icinga/macroprocessor.cpp

206 lines
6.1 KiB
C++

/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012-2014 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. *
******************************************************************************/
#include "icinga/macroprocessor.hpp"
#include "icinga/macroresolver.hpp"
#include "icinga/customvarobject.hpp"
#include "base/array.hpp"
#include "base/objectlock.hpp"
#include "base/logger.hpp"
#include "base/context.hpp"
#include "base/dynamicobject.hpp"
#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)
{
Value result;
if (str.IsEmpty())
return Empty;
if (str.IsScalar()) {
result = InternalResolveMacros(str, resolvers, cr, missingMacro, escapeFn);
} else if (str.IsObjectType<Array>()) {
Array::Ptr resultArr = make_shared<Array>();
Array::Ptr arr = str;
ObjectLock olock(arr);
BOOST_FOREACH(const Value& arg, arr) {
/* Note: don't escape macros here. */
resultArr->Add(InternalResolveMacros(arg, resolvers, cr, missingMacro, EscapeCallback()));
}
result = resultArr;
} else {
BOOST_THROW_EXCEPTION(std::invalid_argument("Command is not a string or array."));
}
return result;
}
bool MacroProcessor::ResolveMacro(const String& macro, const ResolverList& resolvers,
const CheckResult::Ptr& cr, String *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::Ptr mresolver = dynamic_pointer_cast<MacroResolver>(resolver.second);
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;
const Type *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;
}
String MacroProcessor::InternalResolveMacros(const String& str, const ResolverList& resolvers,
const CheckResult::Ptr& cr, String *missingMacro,
const MacroProcessor::EscapeCallback& escapeFn, 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;
String result = str;
while ((pos_first = result.FindFirstOf("$", offset)) != String::NPos) {
pos_second = result.FindFirstOf("$", pos_first + 1);
if (pos_second == String::NPos)
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);
String resolved_macro;
bool recursive_macro;
bool found = ResolveMacro(name, resolvers, cr, &resolved_macro, &recursive_macro);
/* $$ is an escape sequence for $. */
if (name.IsEmpty()) {
resolved_macro = "$";
found = true;
}
if (!found) {
if (!missingMacro)
Log(LogWarning, "MacroProcessor")
<< "Macro '" << name << "' is not defined.";
else
*missingMacro = name;
}
/* recursively resolve macros in the macro if it was a user macro */
if (recursive_macro)
resolved_macro = InternalResolveMacros(resolved_macro,
resolvers, cr, missingMacro, EscapeCallback(), recursionLevel + 1);
if (escapeFn)
resolved_macro = escapeFn(resolved_macro);
result.Replace(pos_first, pos_second - pos_first + 1, resolved_macro);
offset = pos_first + resolved_macro.GetLength() + 1;
}
return result;
}