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Diffstat (limited to 'daemon/session.h')
| -rw-r--r-- | daemon/session.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/daemon/session.h b/daemon/session.h new file mode 100644 index 0000000..56f7eb4 --- /dev/null +++ b/daemon/session.h @@ -0,0 +1,147 @@ +/* Copyright (C) 2018 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 <stdbool.h> +#include <uv.h> + +struct qr_task; +struct worker_ctx; +struct session; + +struct session_flags { + bool outgoing : 1; /**< True: to upstream; false: from a client. */ + bool throttled : 1; /**< True: data reading from peer is temporarily stopped. */ + bool has_tls : 1; /**< True: given session uses TLS. */ + bool connected : 1; /**< True: TCP connection is established. */ + bool closing : 1; /**< True: session close sequence is in progress. */ + bool wirebuf_error : 1; /**< True: last operation with wirebuf ended up with an error. */ +}; + +/* Allocate new session for a libuv handle. + * If handle->tyoe is UV_UDP, tls parameter will be ignored. */ +struct session *session_new(uv_handle_t *handle, bool has_tls); +/* Clear and free given session. */ +void session_free(struct session *session); +/* Clear session. */ +void session_clear(struct session *session); +/** Close session. */ +void session_close(struct session *session); +/** Start reading from underlying libuv IO handle. */ +int session_start_read(struct session *session); +/** Stop reading from underlying libuv IO handle. */ +int session_stop_read(struct session *session); + +/** List of tasks been waiting for IO. */ +/** Check if list is empty. */ +bool session_waitinglist_is_empty(const struct session *session); +/** Add task to the end of the list. */ +int session_waitinglist_push(struct session *session, struct qr_task *task); +/** Get the first element. */ +struct qr_task *session_waitinglist_get(const struct session *session); +/** Get the first element and remove it from the list. */ +struct qr_task *session_waitinglist_pop(struct session *session, bool deref); +/** Get the list length. */ +size_t session_waitinglist_get_len(const struct session *session); +/** Retry resolution for each task in the list. */ +void session_waitinglist_retry(struct session *session, bool increase_timeout_cnt); +/** Finalize all tasks in the list. */ +void session_waitinglist_finalize(struct session *session, int status); + +/** List of tasks associated with session. */ +/** Check if list is empty. */ +bool session_tasklist_is_empty(const struct session *session); +/** Get the first element. */ +struct qr_task *session_tasklist_get_first(struct session *session); +/** Get the first element and remove it from the list. */ +struct qr_task *session_tasklist_del_first(struct session *session, bool deref); +/** Get the list length. */ +size_t session_tasklist_get_len(const struct session *session); +/** Add task to the list. */ +int session_tasklist_add(struct session *session, struct qr_task *task); +/** Remove task from the list. */ +int session_tasklist_del(struct session *session, struct qr_task *task); +/** Remove task with given msg_id, session_flags(session)->outgoing must be true. */ +struct qr_task* session_tasklist_del_msgid(const struct session *session, uint16_t msg_id); +/** Find task with given msg_id */ +struct qr_task* session_tasklist_find_msgid(const struct session *session, uint16_t msg_id); +/** Finalize all tasks in the list. */ +void session_tasklist_finalize(struct session *session, int status); +/** Finalize all expired tasks in the list. */ +int session_tasklist_finalize_expired(struct session *session); + +/** Both of task lists (associated & waiting). */ +/** Check if empty. */ +bool session_is_empty(const struct session *session); +/** Get pointer to session flags */ +struct session_flags *session_flags(struct session *session); +/** Get peer address. */ +struct sockaddr *session_get_peer(struct session *session); +/** Get pointer to server-side tls-related data. */ +struct tls_ctx_t *session_tls_get_server_ctx(const struct session *session); +/** Set pointer to server-side tls-related data. */ +void session_tls_set_server_ctx(struct session *session, struct tls_ctx_t *ctx); +/** Get pointer to client-side tls-related data. */ +struct tls_client_ctx_t *session_tls_get_client_ctx(const struct session *session); +/** Set pointer to client-side tls-related data. */ +void session_tls_set_client_ctx(struct session *session, struct tls_client_ctx_t *ctx); +/** Get pointer to that part of tls-related data which has common structure for + * server and client. */ +struct tls_common_ctx *session_tls_get_common_ctx(const struct session *session); + +/** Get pointer to underlying libuv handle for IO operations. */ +uv_handle_t *session_get_handle(struct session *session); +struct session *session_get(uv_handle_t *h); + +/** Start session timer. */ +int session_timer_start(struct session *session, uv_timer_cb cb, + uint64_t timeout, uint64_t repeat); +/** Restart session timer without changing it parameters. */ +int session_timer_restart(struct session *session); +/** Stop session timer. */ +int session_timer_stop(struct session *session); + +/** Get pointer to the beginning of session wirebuffer. */ +uint8_t *session_wirebuf_get_start(struct session *session); +/** Get size of session wirebuffer. */ +size_t session_wirebuf_get_size(struct session *session); +/** Get pointer to the beginning of free space in session wirebuffer. */ +uint8_t *session_wirebuf_get_free_start(struct session *session); +/** Get amount of free space in session wirebuffer. */ +size_t session_wirebuf_get_free_size(struct session *session); +/** Discard all data in session wirebuffer. */ +void session_wirebuf_discard(struct session *session); +/** Move all data to the beginning of the buffer. */ +void session_wirebuf_compress(struct session *session); +int session_wirebuf_process(struct session *session); +ssize_t session_wirebuf_consume(struct session *session, + const uint8_t *data, ssize_t len); + +/** poison session structure with ASAN. */ +void session_poison(struct session *session); +/** unpoison session structure with ASAN. */ +void session_unpoison(struct session *session); + +knot_pkt_t *session_produce_packet(struct session *session, knot_mm_t *mm); +int session_discard_packet(struct session *session, const knot_pkt_t *pkt); + +void session_kill_ioreq(struct session *s, struct qr_task *task); +/** Update timestamp */ +void session_touch(struct session *s); +/** Returns either creation time or time of last IO activity if any occurs. */ +/* Used for TCP timeout calculation. */ +uint64_t session_last_activity(struct session *s); 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