1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
// Copyright (C) 2016-2024 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 <database/database_connection.h>
#include <dhcpsrv/cfg_db_access.h>
#include <dhcpsrv/db_type.h>
#include <dhcpsrv/dhcpsrv_log.h>
#include <dhcpsrv/host_data_source_factory.h>
#include <dhcpsrv/host_mgr.h>
#include <dhcpsrv/lease_mgr_factory.h>
#include <boost/algorithm/string.hpp><--- Include file:  not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <boost/lexical_cast.hpp><--- Include file:  not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <sstream><--- Include file:  not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <vector><--- Include file:  not found. Please note: Cppcheck does not need standard library headers to get proper results.

using namespace isc::data;
using namespace isc::db;

namespace isc {
namespace dhcp {

CfgDbAccess::CfgDbAccess()
    : appended_parameters_(), lease_db_access_("type=memfile"),
      host_db_access_(), ip_reservations_unique_(true),
      extended_info_tables_enabled_(false) {
}

std::string
CfgDbAccess::getLeaseDbAccessString() const {
    return (getAccessString(lease_db_access_));
}


std::string
CfgDbAccess::getHostDbAccessString() const {
    if (host_db_access_.empty()) {
        return ("");
    } else {
        return (getAccessString(host_db_access_.front()));
    }
}

std::list<std::string>
CfgDbAccess::getHostDbAccessStringList() const {
    std::list<std::string> ret;
    for (const std::string& dbaccess : host_db_access_) {
        if (!dbaccess.empty()) {
            ret.push_back(getAccessString(dbaccess));
        }
    }
    return (ret);
}

void
CfgDbAccess::createManagers() const {
    std::string access = getLeaseDbAccessString();
    try {
        // Recreate lease manager without preserving the registered callbacks.
        LeaseMgrFactory::recreate(access, false);
    } catch (const isc::db::DbOpenErrorWithRetry& err) {
        std::string redacted;
        try {
            DatabaseConnection::ParameterMap parameters = DatabaseConnection::parse(access);
            redacted = DatabaseConnection::redactedAccessString(parameters);
        } catch (...) {
        }
        LOG_INFO(dhcpsrv_logger, DHCPSRV_LEASE_MGR_DB_OPEN_CONNECTION_WITH_RETRY_FAILED)
                .arg(redacted).arg(err.what());
    }

    // Recreate host data source.
    HostMgr::create();

    // Restore the host cache.
    if (HostDataSourceFactory::registeredFactory("cache")) {
        HostMgr::addBackend("type=cache");
    }

    // Add database backends.
    std::list<std::string> host_db_access_list = getHostDbAccessStringList();
    for (std::string& hds : host_db_access_list) {<--- Variable 'hds' can be declared as reference to const
        try {
            HostMgr::addBackend(hds);
        } catch (const isc::db::DbOpenErrorWithRetry& err) {
            std::string redacted;
            try {
                DatabaseConnection::ParameterMap parameters = DatabaseConnection::parse(hds);
                redacted = DatabaseConnection::redactedAccessString(parameters);
            } catch (...) {
            }
            LOG_INFO(dhcpsrv_logger, DHCPSRV_HOST_MGR_DB_OPEN_CONNECTION_WITH_RETRY_FAILED)
                    .arg(redacted).arg(err.what());
        }
    }

    // Check for a host cache.
    HostMgr::checkCacheBackend(true);

    // Populate the ip-reservations-unique global setting to HostMgr.
    // This operation may fail if any of the host backends does not support
    // the new setting. We throw an exception here to signal configuration
    // error. The exception does not contain the backend name but the called
    // function in HostMgr logs a warning message that contains the name of
    // the backend.
    if (!HostMgr::instance().setIPReservationsUnique(ip_reservations_unique_)) {
        isc_throw(InvalidOperation, "unable to configure the server to allow "
                  "non unique IP reservations (ip-reservations-unique=false) "
                  "because some host backends in use do not support this "
                  "setting");
    }
}

std::string
CfgDbAccess::getAccessString(const std::string& access_string) const {
    std::ostringstream s;
    s << access_string;
    // Only append additional parameters if any parameters are specified
    // in a configuration. For host database, no parameters mean that
    // database access is disabled and thus we don't want to append any
    // parameters.
    if ((s.tellp() != std::streampos(0)) && (!appended_parameters_.empty())) {
        s << " " << appended_parameters_;
    }

    return (s.str());
}

} // end of isc::dhcp namespace
} // end of isc namespace