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Diffstat (limited to 'src/knot/server/server.h')
| -rw-r--r-- | src/knot/server/server.h | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/src/knot/server/server.h b/src/knot/server/server.h new file mode 100644 index 0000000..5adafdb --- /dev/null +++ b/src/knot/server/server.h @@ -0,0 +1,203 @@ +/* Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz> + + 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 3 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, see <https://www.gnu.org/licenses/>. + */ + +#pragma once + +#include <stdatomic.h> + +#include "knot/conf/conf.h" +#include "knot/catalog/catalog_update.h" +#include "knot/common/evsched.h" +#include "knot/common/fdset.h" +#include "knot/journal/knot_lmdb.h" +#include "knot/server/dthreads.h" +#include "knot/worker/pool.h" +#include "knot/zone/backup.h" +#include "knot/zone/zonedb.h" + +struct server; +struct knot_xdp_socket; +struct knot_quic_creds; + +/*! + * \brief I/O handler structure. + */ +typedef struct { + struct server *server; /*!< Reference to server. */ + dt_unit_t *unit; /*!< Threading unit. */ + unsigned *thread_state; /*!< Thread states. */ + unsigned *thread_id; /*!< Thread identifiers per all handlers. */ +} iohandler_t; + +/*! + * \brief Server state flags. + */ +typedef enum { + ServerIdle = 0 << 0, /*!< Server is idle. */ + ServerRunning = 1 << 0, /*!< Server is running. */ +} server_state_t; + +/*! + * \brief Server reload kinds. + */ +typedef enum { + RELOAD_NONE = 0, + RELOAD_FULL = 1 << 0, /*!< Reload the server and all zones. */ + RELOAD_COMMIT = 1 << 1, /*!< Process changes from dynamic configuration. */ + RELOAD_ZONES = 1 << 2, /*!< Reload all zones. */ + RELOAD_CATALOG = 1 << 3, /*!< Process catalog zone changes. */ +} reload_t; + +/*! + * \brief Server interface structure. + */ +typedef struct { + int *fd_udp; + unsigned fd_udp_count; + int *fd_tcp; + unsigned fd_tcp_count; + int *fd_xdp; + unsigned fd_xdp_count; + unsigned xdp_first_thread_id; + struct knot_xdp_socket **xdp_sockets; + struct sockaddr_storage addr; +} iface_t; + +/*! + * \brief Handler indexes. + */ +enum { + IO_UDP = 0, + IO_TCP = 1, + IO_XDP = 2, +}; + +/*! + * \brief Main server structure. + * + * Keeps references to all important structures needed for operation. + */ +typedef struct server { + /*! \brief Server state tracking. */ + volatile unsigned state; + + knot_zonedb_t *zone_db; + knot_lmdb_db_t timerdb; + knot_lmdb_db_t journaldb; + knot_lmdb_db_t kaspdb; + catalog_t catalog; + + /*! \brief I/O handlers. */ + struct { + unsigned size; + iohandler_t handler; + } handlers[3]; + + /*! \brief Background jobs. */ + worker_pool_t *workers; + + /*! \brief Event scheduler. */ + evsched_t sched; + + /*! \brief List of interfaces. */ + iface_t *ifaces; + size_t n_ifaces; + + /*! \brief Pending changes to catalog member zones, update indication. */ + catalog_update_t catalog_upd; + atomic_bool catalog_upd_signal; + + /*! \brief Context of pending zones' backup. */ + zone_backup_ctxs_t backup_ctxs; + + /*! \brief Crendentials context for QUIC. */ + struct knot_quic_creds *quic_creds; +} server_t; + +/*! + * \brief Initializes the server structure. + * + * \retval KNOT_EOK on success. + * \retval KNOT_EINVAL on invalid parameters. + */ +int server_init(server_t *server, int bg_workers); + +/*! + * \brief Properly destroys the server structure. + * + * \param server Server structure to be used for operation. + */ +void server_deinit(server_t *server); + +/*! + * \brief Starts the server. + * + * \param server Server structure to be used for operation. + * \param async Don't wait for zones to load if true. + * + * \retval KNOT_EOK on success. + * \retval KNOT_EINVAL on invalid parameters. + * + */ +int server_start(server_t *server, bool async); + +/*! + * \brief Waits for the server to finish. + * + * \param server Server structure to be used for operation. + * + */ +void server_wait(server_t *server); + +/*! + * \brief Reload server configuration. + * + * \param server Server instance. + * \param mode Reload mode. + * + * \return Error code, KNOT_EOK if success. + */ +int server_reload(server_t *server, reload_t mode); + +/*! + * \brief Requests server to stop. + * + * \param server Server structure to be used for operation. + */ +void server_stop(server_t *server); + +/*! + * \brief Server reconfiguration routine. + * + * Routine for dynamic server reconfiguration. + * + * \param conf Configuration. + * \param server Server instance. + * + * \return Error code, KNOT_EOK if success. + */ +int server_reconfigure(conf_t *conf, server_t *server); + +/*! + * \brief Reconfigure zone database. + * + * Routine for dynamic server zones reconfiguration. + * + * \param conf Configuration. + * \param server Server instance. + * \param mode Reload mode. + */ +void server_update_zones(conf_t *conf, server_t *server, reload_t mode); |