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// Copyright (C) 2017-2021 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <hooks/hooks_config.h>
#include <hooks/hooks_manager.h>
using namespace std;
using namespace isc;
using namespace isc::data;
namespace isc {
namespace hooks {
void
HooksConfig::verifyLibraries(const Element::Position& position) const {
// The code used to follow this logic:
//
// Check if the list of libraries has changed. If not, nothing is done
// - the command "DhcpN libreload" is required to reload the same
// libraries (this prevents needless reloads when anything else in the
// configuration is changed).
//
// We no longer rely on this. Parameters can change. And even if the
// parameters stay the same, they could point to files that could
// change. We can skip loading routines only if there were and there still
// are no libraries specified.
vector<string> current_libraries = HooksManager::getLibraryNames();
if (current_libraries.empty() && libraries_.empty()) {
return;
}
// Library list has changed, validate each of the libraries specified.
vector<string> lib_names = isc::hooks::extractNames(libraries_);
vector<string> error_libs = HooksManager::validateLibraries(lib_names);
if (!error_libs.empty()) {
// Construct the list of libraries in error for the message.
string error_list = error_libs[0];
for (size_t i = 1; i < error_libs.size(); ++i) {
error_list += (string(", ") + error_libs[i]);
}
isc_throw(InvalidHooksLibraries,
"hooks libraries failed to validate - "
"library or libraries in error are: "
<< error_list << " (" << position << ")");
}
}
void
HooksConfig::loadLibraries() const {
/// Commits the list of libraries to the configuration manager storage if
/// the list of libraries has changed.
/// @todo: Delete any stored CalloutHandles before reloading the
/// libraries
if (!HooksManager::loadLibraries(libraries_)) {
isc_throw(InvalidHooksLibraries,
"One or more hook libraries failed to load");
}
}
bool
HooksConfig::equal(const HooksConfig& other) const {
/// @todo: This comparision assumes that the library order is not relevant,
/// so [ lib1, lib2 ] is equal to [ lib2, lib1 ]. However, this is not strictly
/// true, because callouts execution is called in other they're loaded. Therefore
/// changing the libraries order may change the server behavior.
///
/// We don't have any libraries that are interacting (or would change their behavior
/// depending on the order in which their callouts are executed), so the code is
/// ok for now.
for (isc::hooks::HookLibsCollection::const_iterator this_it = libraries_.begin();
this_it != libraries_.end(); ++this_it) {
bool match = false;
for (isc::hooks::HookLibsCollection::const_iterator other_it =
other.libraries_.begin(); other_it != other.libraries_.end(); ++other_it) {
if (this_it->first != other_it->first) {
continue;
}
if (isNull(this_it->second) && isNull(other_it->second)) {
match = true;
break;
}
if (isNull(this_it->second) || isNull(other_it->second)) {
continue;
}
if (this_it->second->equals(*other_it->second)) {
match = true;
break;
}
}
// No match found for the particular hooks library so return false.
if (!match) {
return (false);
}
}
return (true);
}
ElementPtr
HooksConfig::toElement() const {
// hooks-libraries is a list of maps
ElementPtr result = Element::createList();
// Iterate through libraries
for (HookLibsCollection::const_iterator hl = libraries_.begin();
hl != libraries_.end(); ++hl) {
// Entries are maps
ElementPtr map = Element::createMap();
// Set the library name
map->set("library", Element::create(hl->first));
// Set parameters (not set vs set empty map)
if (!isNull(hl->second)) {
map->set("parameters", hl->second);
}
// Push to the list
result->add(map);
}
return (result);
}
};
};
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