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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:26:00 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:26:00 +0000
commit830407e88f9d40d954356c3754f2647f91d5c06a (patch)
treed6a0ece6feea91f3c656166dbaa884ef8a29740e /daemon/session.c
parentInitial commit. (diff)
downloadknot-resolver-830407e88f9d40d954356c3754f2647f91d5c06a.tar.xz
knot-resolver-830407e88f9d40d954356c3754f2647f91d5c06a.zip
Adding upstream version 5.6.0.upstream/5.6.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--daemon/session.c834
1 files changed, 834 insertions, 0 deletions
diff --git a/daemon/session.c b/daemon/session.c
new file mode 100644
index 0000000..a1f2207
--- /dev/null
+++ b/daemon/session.c
@@ -0,0 +1,834 @@
+/* Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <libknot/packet/pkt.h>
+
+#include "lib/defines.h"
+#include "daemon/session.h"
+#include "daemon/tls.h"
+#include "daemon/http.h"
+#include "daemon/worker.h"
+#include "daemon/io.h"
+#include "daemon/proxyv2.h"
+#include "lib/generic/queue.h"
+
+#define TLS_CHUNK_SIZE (16 * 1024)
+
+/* Initial max frame size: https://tools.ietf.org/html/rfc7540#section-6.5.2 */
+#define HTTP_MAX_FRAME_SIZE 16384
+
+/* Per-socket (TCP or UDP) persistent structure.
+ *
+ * In particular note that for UDP clients it's just one session (per socket)
+ * shared for all clients. For TCP/TLS it's also for the connection-specific socket,
+ * i.e one session per connection.
+ *
+ * LATER(optim.): the memory here is used a bit wastefully.
+ */
+struct session {
+ struct session_flags sflags; /**< miscellaneous flags. */
+ union kr_sockaddr peer; /**< address of peer; not for UDP clients (downstream) */
+ union kr_sockaddr sockname; /**< our local address; for UDP it may be a wildcard */
+ uv_handle_t *handle; /**< libuv handle for IO operations. */
+ uv_timer_t timeout; /**< libuv handle for timer. */
+
+ struct tls_ctx *tls_ctx; /**< server side tls-related data. */
+ struct tls_client_ctx *tls_client_ctx; /**< client side tls-related data. */
+
+ struct proxy_result *proxy; /**< PROXYv2 data for TCP. May be `NULL` if not proxied. */
+
+#if ENABLE_DOH2
+ struct http_ctx *http_ctx; /**< server side http-related data. */
+#endif
+
+ trie_t *tasks; /**< list of tasks associated with given session. */
+ queue_t(struct qr_task *) waiting; /**< list of tasks waiting for sending to upstream. */
+
+ uint8_t *wire_buf; /**< Buffer for DNS message, except for XDP. */
+ ssize_t wire_buf_size; /**< Buffer size. */
+ ssize_t wire_buf_start_idx; /**< Data start offset in wire_buf. */
+ ssize_t wire_buf_end_idx; /**< Data end offset in wire_buf. */
+ uint64_t last_activity; /**< Time of last IO activity (if any occurs).
+ * Otherwise session creation time. */
+ bool was_useful; /**< I.e. produced a DNS message at some point. */
+};
+
+static void on_session_close(uv_handle_t *handle)
+{
+ struct session *session = handle->data;
+ kr_require(session->handle == handle);
+ io_free(handle);
+}
+
+static void on_session_timer_close(uv_handle_t *timer)
+{
+ struct session *session = timer->data;
+ uv_handle_t *handle = session->handle;
+ kr_require(handle && handle->data == session);
+ kr_require(session->sflags.outgoing || handle->type == UV_TCP);
+ if (!uv_is_closing(handle)) {
+ uv_close(handle, on_session_close);
+ }
+}
+
+void session_free(struct session *session)
+{
+ if (session) {
+ session_clear(session);
+ free(session);
+ }
+}
+
+void session_clear(struct session *session)
+{
+ kr_require(session_is_empty(session));
+ if (session->handle && session->handle->type == UV_TCP) {
+ free(session->wire_buf);
+ }
+ free(session->proxy);
+#if ENABLE_DOH2
+ http_free(session->http_ctx);
+#endif
+ trie_clear(session->tasks);
+ trie_free(session->tasks);
+ queue_deinit(session->waiting);
+ tls_free(session->tls_ctx);
+ tls_client_ctx_free(session->tls_client_ctx);
+ memset(session, 0, sizeof(*session));
+}
+
+void session_close(struct session *session)
+{
+ kr_require(session_is_empty(session));
+ if (session->sflags.closing) {
+ return;
+ }
+
+ uv_handle_t *handle = session->handle;
+ io_stop_read(handle);
+ session->sflags.closing = true;
+
+ if (!uv_is_closing((uv_handle_t *)&session->timeout)) {
+ uv_timer_stop(&session->timeout);
+ if (session->tls_client_ctx) {
+ tls_client_close(session->tls_client_ctx);
+ }
+ if (session->tls_ctx) {
+ tls_close(&session->tls_ctx->c);
+ }
+
+ session->timeout.data = session;
+ uv_close((uv_handle_t *)&session->timeout, on_session_timer_close);
+ }
+}
+
+bool session_was_useful(const struct session *session)
+{
+ return session->was_useful;
+}
+
+int session_start_read(struct session *session)
+{
+ return io_start_read(session->handle);
+}
+
+int session_stop_read(struct session *session)
+{
+ return io_stop_read(session->handle);
+}
+
+int session_waitinglist_push(struct session *session, struct qr_task *task)
+{
+ queue_push(session->waiting, task);
+ worker_task_ref(task);
+ return kr_ok();
+}
+
+struct qr_task *session_waitinglist_get(const struct session *session)
+{
+ return (queue_len(session->waiting) > 0) ? (queue_head(session->waiting)) : NULL;
+}
+
+struct qr_task *session_waitinglist_pop(struct session *session, bool deref)
+{
+ struct qr_task *t = session_waitinglist_get(session);
+ queue_pop(session->waiting);
+ if (deref) {
+ worker_task_unref(t);
+ }
+ return t;
+}
+
+int session_tasklist_add(struct session *session, struct qr_task *task)
+{
+ trie_t *t = session->tasks;
+ uint16_t task_msg_id = 0;
+ const char *key = NULL;
+ size_t key_len = 0;
+ if (session->sflags.outgoing) {
+ knot_pkt_t *pktbuf = worker_task_get_pktbuf(task);
+ task_msg_id = knot_wire_get_id(pktbuf->wire);
+ key = (const char *)&task_msg_id;
+ key_len = sizeof(task_msg_id);
+ } else {
+ key = (const char *)&task;
+ key_len = sizeof(char *);
+ }
+ trie_val_t *v = trie_get_ins(t, key, key_len);
+ if (kr_fails_assert(v))
+ return kr_error(ENOMEM);
+ if (*v == NULL) {
+ *v = task;
+ worker_task_ref(task);
+ } else if (kr_fails_assert(*v == task)) {
+ return kr_error(EINVAL);
+ }
+ return kr_ok();
+}
+
+int session_tasklist_del(struct session *session, struct qr_task *task)
+{
+ trie_t *t = session->tasks;
+ uint16_t task_msg_id = 0;
+ const char *key = NULL;
+ size_t key_len = 0;
+ trie_val_t val;
+ if (session->sflags.outgoing) {
+ knot_pkt_t *pktbuf = worker_task_get_pktbuf(task);
+ task_msg_id = knot_wire_get_id(pktbuf->wire);
+ key = (const char *)&task_msg_id;
+ key_len = sizeof(task_msg_id);
+ } else {
+ key = (const char *)&task;
+ key_len = sizeof(char *);
+ }
+ int ret = trie_del(t, key, key_len, &val);
+ if (ret == KNOT_EOK) {
+ kr_require(val == task);
+ worker_task_unref(val);
+ }
+ return ret;
+}
+
+struct qr_task *session_tasklist_get_first(struct session *session)
+{
+ trie_val_t *val = trie_get_first(session->tasks, NULL, NULL);
+ return val ? (struct qr_task *) *val : NULL;
+}
+
+struct qr_task *session_tasklist_del_first(struct session *session, bool deref)
+{
+ trie_val_t val = NULL;
+ int res = trie_del_first(session->tasks, NULL, NULL, &val);
+ if (res != KNOT_EOK) {
+ val = NULL;
+ } else if (deref) {
+ worker_task_unref(val);
+ }
+ return (struct qr_task *)val;
+}
+struct qr_task* session_tasklist_del_msgid(const struct session *session, uint16_t msg_id)
+{
+ if (kr_fails_assert(session->sflags.outgoing))
+ return NULL;
+ trie_t *t = session->tasks;
+ struct qr_task *ret = NULL;
+ const char *key = (const char *)&msg_id;
+ size_t key_len = sizeof(msg_id);
+ trie_val_t val;
+ int res = trie_del(t, key, key_len, &val);
+ if (res == KNOT_EOK) {
+ if (worker_task_numrefs(val) > 1) {
+ ret = val;
+ }
+ worker_task_unref(val);
+ }
+ return ret;
+}
+
+struct qr_task* session_tasklist_find_msgid(const struct session *session, uint16_t msg_id)
+{
+ if (kr_fails_assert(session->sflags.outgoing))
+ return NULL;
+ trie_t *t = session->tasks;
+ struct qr_task *ret = NULL;
+ trie_val_t *val = trie_get_try(t, (char *)&msg_id, sizeof(msg_id));
+ if (val) {
+ ret = *val;
+ }
+ return ret;
+}
+
+struct session_flags *session_flags(struct session *session)
+{
+ return &session->sflags;
+}
+
+struct sockaddr *session_get_peer(struct session *session)
+{
+ return &session->peer.ip;
+}
+
+struct sockaddr *session_get_sockname(struct session *session)
+{
+ return &session->sockname.ip;
+}
+
+struct tls_ctx *session_tls_get_server_ctx(const struct session *session)
+{
+ return session->tls_ctx;
+}
+
+void session_tls_set_server_ctx(struct session *session, struct tls_ctx *ctx)
+{
+ session->tls_ctx = ctx;
+}
+
+struct tls_client_ctx *session_tls_get_client_ctx(const struct session *session)
+{
+ return session->tls_client_ctx;
+}
+
+void session_tls_set_client_ctx(struct session *session, struct tls_client_ctx *ctx)
+{
+ session->tls_client_ctx = ctx;
+}
+
+struct tls_common_ctx *session_tls_get_common_ctx(const struct session *session)
+{
+ struct tls_common_ctx *tls_ctx = session->sflags.outgoing ? &session->tls_client_ctx->c :
+ &session->tls_ctx->c;
+ return tls_ctx;
+}
+
+#if ENABLE_DOH2
+struct http_ctx *session_http_get_server_ctx(const struct session *session)
+{
+ return session->http_ctx;
+}
+
+void session_http_set_server_ctx(struct session *session, struct http_ctx *ctx)
+{
+ session->http_ctx = ctx;
+}
+#endif
+
+uv_handle_t *session_get_handle(struct session *session)
+{
+ return session->handle;
+}
+
+struct session *session_get(uv_handle_t *h)
+{
+ return h->data;
+}
+
+struct session *session_new(uv_handle_t *handle, bool has_tls, bool has_http)
+{
+ if (!handle) {
+ return NULL;
+ }
+ struct session *session = calloc(1, sizeof(struct session));
+ if (!session) {
+ return NULL;
+ }
+
+ queue_init(session->waiting);
+ session->tasks = trie_create(NULL);
+ if (handle->type == UV_TCP) {
+ size_t wire_buffer_size = KNOT_WIRE_MAX_PKTSIZE;
+ if (has_tls) {
+ /* When decoding large packets,
+ * gnutls gives the application chunks of size 16 kb each. */
+ wire_buffer_size += TLS_CHUNK_SIZE;
+ session->sflags.has_tls = true;
+ }
+#if ENABLE_DOH2
+ if (has_http) {
+ /* When decoding large packets,
+ * HTTP/2 frames can be up to 16 KB by default. */
+ wire_buffer_size += HTTP_MAX_FRAME_SIZE;
+ session->sflags.has_http = true;
+ }
+#endif
+ uint8_t *wire_buf = malloc(wire_buffer_size);
+ if (!wire_buf) {
+ free(session);
+ return NULL;
+ }
+ session->wire_buf = wire_buf;
+ session->wire_buf_size = wire_buffer_size;
+ } else if (handle->type == UV_UDP) {
+ /* We use the singleton buffer from worker for all UDP (!)
+ * libuv documentation doesn't really guarantee this is OK,
+ * but the implementation for unix systems does not hold
+ * the buffer (both UDP and TCP) - always makes a NON-blocking
+ * syscall that fills the buffer and immediately calls
+ * the callback, whatever the result of the operation.
+ * We still need to keep in mind to only touch the buffer
+ * in this callback... */
+ kr_require(the_worker);
+ session->wire_buf = the_worker->wire_buf;
+ session->wire_buf_size = sizeof(the_worker->wire_buf);
+ } else {
+ kr_assert(handle->type == UV_POLL/*XDP*/);
+ /* - wire_buf* are left zeroed, as they make no sense
+ * - timer is unused but OK for simplicity (server-side sessions are few)
+ */
+ }
+
+ uv_timer_init(handle->loop, &session->timeout);
+
+ session->handle = handle;
+ handle->data = session;
+ session->timeout.data = session;
+ session_touch(session);
+
+ return session;
+}
+
+size_t session_tasklist_get_len(const struct session *session)
+{
+ return trie_weight(session->tasks);
+}
+
+size_t session_waitinglist_get_len(const struct session *session)
+{
+ return queue_len(session->waiting);
+}
+
+bool session_tasklist_is_empty(const struct session *session)
+{
+ return session_tasklist_get_len(session) == 0;
+}
+
+bool session_waitinglist_is_empty(const struct session *session)
+{
+ return session_waitinglist_get_len(session) == 0;
+}
+
+bool session_is_empty(const struct session *session)
+{
+ return session_tasklist_is_empty(session) &&
+ session_waitinglist_is_empty(session);
+}
+
+bool session_has_tls(const struct session *session)
+{
+ return session->sflags.has_tls;
+}
+
+void session_set_has_tls(struct session *session, bool has_tls)
+{
+ session->sflags.has_tls = has_tls;
+}
+
+void session_waitinglist_retry(struct session *session, bool increase_timeout_cnt)
+{
+ while (!session_waitinglist_is_empty(session)) {
+ struct qr_task *task = session_waitinglist_pop(session, false);
+ if (increase_timeout_cnt) {
+ worker_task_timeout_inc(task);
+ }
+ worker_task_step(task, &session->peer.ip, NULL);
+ worker_task_unref(task);
+ }
+}
+
+void session_waitinglist_finalize(struct session *session, int status)
+{
+ while (!session_waitinglist_is_empty(session)) {
+ struct qr_task *t = session_waitinglist_pop(session, false);
+ worker_task_finalize(t, status);
+ worker_task_unref(t);
+ }
+}
+
+struct proxy_result *session_proxy_create(struct session *session)
+{
+ if (!kr_fails_assert(!session->proxy)) {
+ session->proxy = calloc(1, sizeof(struct proxy_result));
+ kr_require(session->proxy);
+ }
+
+ return session->proxy;
+}
+
+struct proxy_result *session_proxy_get(struct session *session)
+{
+ return session->proxy;
+}
+
+void session_tasklist_finalize(struct session *session, int status)
+{
+ while (session_tasklist_get_len(session) > 0) {
+ struct qr_task *t = session_tasklist_del_first(session, false);
+ kr_require(worker_task_numrefs(t) > 0);
+ worker_task_finalize(t, status);
+ worker_task_unref(t);
+ }
+}
+
+int session_tasklist_finalize_expired(struct session *session)
+{
+ int ret = 0;
+ queue_t(struct qr_task *) q;
+ uint64_t now = kr_now();
+ trie_t *t = session->tasks;
+ trie_it_t *it;
+ queue_init(q);
+ for (it = trie_it_begin(t); !trie_it_finished(it); trie_it_next(it)) {
+ trie_val_t *v = trie_it_val(it);
+ struct qr_task *task = (struct qr_task *)*v;
+ if ((now - worker_task_creation_time(task)) >= KR_RESOLVE_TIME_LIMIT) {
+ struct kr_request *req = worker_task_request(task);
+ if (!kr_fails_assert(req))
+ kr_query_inform_timeout(req, req->current_query);
+ queue_push(q, task);
+ worker_task_ref(task);
+ }
+ }
+ trie_it_free(it);
+
+ struct qr_task *task = NULL;
+ uint16_t msg_id = 0;
+ char *key = (char *)&task;
+ int32_t keylen = sizeof(struct qr_task *);
+ if (session->sflags.outgoing) {
+ key = (char *)&msg_id;
+ keylen = sizeof(msg_id);
+ }
+ while (queue_len(q) > 0) {
+ task = queue_head(q);
+ if (session->sflags.outgoing) {
+ knot_pkt_t *pktbuf = worker_task_get_pktbuf(task);
+ msg_id = knot_wire_get_id(pktbuf->wire);
+ }
+ int res = trie_del(t, key, keylen, NULL);
+ if (!worker_task_finished(task)) {
+ /* task->pending_count must be zero,
+ * but there are can be followers,
+ * so run worker_task_subreq_finalize() to ensure retrying
+ * for all the followers. */
+ worker_task_subreq_finalize(task);
+ worker_task_finalize(task, KR_STATE_FAIL);
+ }
+ if (res == KNOT_EOK) {
+ worker_task_unref(task);
+ }
+ queue_pop(q);
+ worker_task_unref(task);
+ ++ret;
+ }
+
+ queue_deinit(q);
+ return ret;
+}
+
+int session_timer_start(struct session *session, uv_timer_cb cb,
+ uint64_t timeout, uint64_t repeat)
+{
+ uv_timer_t *timer = &session->timeout;
+ // Session might be closing and get here e.g. through a late on_send callback.
+ const bool is_closing = uv_is_closing((uv_handle_t *)timer);
+ if (is_closing || kr_fails_assert(is_closing == session->sflags.closing))
+ return kr_error(EINVAL);
+
+ if (kr_fails_assert(timer->data == session))
+ return kr_error(EINVAL);
+ int ret = uv_timer_start(timer, cb, timeout, repeat);
+ if (ret != 0) {
+ uv_timer_stop(timer);
+ return kr_error(ret);
+ }
+ return kr_ok();
+}
+
+int session_timer_restart(struct session *session)
+{
+ kr_require(!uv_is_closing((uv_handle_t *)&session->timeout));
+ return uv_timer_again(&session->timeout);
+}
+
+int session_timer_stop(struct session *session)
+{
+ return uv_timer_stop(&session->timeout);
+}
+
+ssize_t session_wirebuf_consume(struct session *session, const uint8_t *data, ssize_t len)
+{
+ if (kr_fails_assert(data == &session->wire_buf[session->wire_buf_end_idx]))
+ return kr_error(EINVAL);
+ if (kr_fails_assert(len >= 0))
+ return kr_error(EINVAL);
+ if (kr_fails_assert(session->wire_buf_end_idx + len <= session->wire_buf_size))
+ return kr_error(EINVAL);
+
+ session->wire_buf_end_idx += len;
+ return len;
+}
+
+ssize_t session_wirebuf_trim(struct session *session, ssize_t len)
+{
+ if (kr_fails_assert(len >= 0))
+ return kr_error(EINVAL);
+ if (kr_fails_assert(session->wire_buf_start_idx + len <= session->wire_buf_size))
+ return kr_error(EINVAL);
+
+ session->wire_buf_start_idx += len;
+ if (session->wire_buf_start_idx > session->wire_buf_end_idx)
+ session->wire_buf_end_idx = session->wire_buf_start_idx;
+ return len;
+}
+
+knot_pkt_t *session_produce_packet(struct session *session, knot_mm_t *mm)
+{
+ session->sflags.wirebuf_error = false;
+ if (session->wire_buf_end_idx == 0) {
+ return NULL;
+ }
+
+ if (session->wire_buf_start_idx == session->wire_buf_end_idx) {
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+ return NULL;
+ }
+
+ if (session->wire_buf_start_idx > session->wire_buf_end_idx) {
+ session->sflags.wirebuf_error = true;
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+ return NULL;
+ }
+
+ const uv_handle_t *handle = session->handle;
+ uint8_t *msg_start = &session->wire_buf[session->wire_buf_start_idx];
+ ssize_t wirebuf_msg_data_size = session->wire_buf_end_idx - session->wire_buf_start_idx;
+ uint16_t msg_size = 0;
+
+ if (!handle) {
+ session->sflags.wirebuf_error = true;
+ return NULL;
+ } else if (handle->type == UV_TCP) {
+ if (wirebuf_msg_data_size < 2) {
+ return NULL;
+ }
+ msg_size = knot_wire_read_u16(msg_start);
+ if (msg_size >= session->wire_buf_size) {
+ session->sflags.wirebuf_error = true;
+ return NULL;
+ }
+ if (msg_size + 2 > wirebuf_msg_data_size) {
+ return NULL;
+ }
+ if (msg_size == 0) {
+ session->sflags.wirebuf_error = true;
+ return NULL;
+ }
+ msg_start += 2;
+ } else if (wirebuf_msg_data_size < UINT16_MAX) {
+ msg_size = wirebuf_msg_data_size;
+ } else {
+ session->sflags.wirebuf_error = true;
+ return NULL;
+ }
+
+ session->was_useful = true;
+ knot_pkt_t *pkt = knot_pkt_new(msg_start, msg_size, mm);
+ session->sflags.wirebuf_error = (pkt == NULL);
+ return pkt;
+}
+
+int session_discard_packet(struct session *session, const knot_pkt_t *pkt)
+{
+ uv_handle_t *handle = session->handle;
+ /* Pointer to data start in wire_buf */
+ uint8_t *wirebuf_data_start = &session->wire_buf[session->wire_buf_start_idx];
+ /* Number of data bytes in wire_buf */
+ size_t wirebuf_data_size = session->wire_buf_end_idx - session->wire_buf_start_idx;
+ /* Pointer to message start in wire_buf */
+ uint8_t *wirebuf_msg_start = wirebuf_data_start;
+ /* Number of message bytes in wire_buf.
+ * For UDP it is the same number as wirebuf_data_size. */
+ size_t wirebuf_msg_size = wirebuf_data_size;
+ /* Wire data from parsed packet. */
+ uint8_t *pkt_msg_start = pkt->wire;
+ /* Number of bytes in packet wire buffer. */
+ size_t pkt_msg_size = pkt->size;
+ if (knot_pkt_has_tsig(pkt)) {
+ pkt_msg_size += pkt->tsig_wire.len;
+ }
+
+ session->sflags.wirebuf_error = true;
+
+ if (!handle) {
+ return kr_error(EINVAL);
+ } else if (handle->type == UV_TCP) {
+ /* wire_buf contains TCP DNS message. */
+ if (kr_fails_assert(wirebuf_data_size >= 2)) {
+ /* TCP message length field isn't in buffer, must not happen. */
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+ return kr_error(EINVAL);
+ }
+ wirebuf_msg_size = knot_wire_read_u16(wirebuf_msg_start);
+ wirebuf_msg_start += 2;
+ if (kr_fails_assert(wirebuf_msg_size + 2 <= wirebuf_data_size)) {
+ /* TCP message length field is greater then
+ * number of bytes in buffer, must not happen. */
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+ return kr_error(EINVAL);
+ }
+ }
+
+ if (kr_fails_assert(wirebuf_msg_start == pkt_msg_start)) {
+ /* packet wirebuf must be located at the beginning
+ * of the session wirebuf, must not happen. */
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+ return kr_error(EINVAL);
+ }
+
+ if (kr_fails_assert(wirebuf_msg_size >= pkt_msg_size)) {
+ /* Message length field is lesser then packet size,
+ * must not happen. */
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+ return kr_error(EINVAL);
+ }
+
+ if (handle->type == UV_TCP) {
+ session->wire_buf_start_idx += wirebuf_msg_size + 2;
+ } else {
+ session->wire_buf_start_idx += pkt_msg_size;
+ }
+ session->sflags.wirebuf_error = false;
+
+ wirebuf_data_size = session->wire_buf_end_idx - session->wire_buf_start_idx;
+ if (wirebuf_data_size == 0) {
+ session_wirebuf_discard(session);
+ } else if (wirebuf_data_size < KNOT_WIRE_HEADER_SIZE) {
+ session_wirebuf_compress(session);
+ }
+
+ return kr_ok();
+}
+
+void session_wirebuf_discard(struct session *session)
+{
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = 0;
+}
+
+void session_wirebuf_compress(struct session *session)
+{
+ if (session->wire_buf_start_idx == 0) {
+ return;
+ }
+ uint8_t *wirebuf_data_start = &session->wire_buf[session->wire_buf_start_idx];
+ size_t wirebuf_data_size = session->wire_buf_end_idx - session->wire_buf_start_idx;
+ if (session->wire_buf_start_idx < wirebuf_data_size) {
+ memmove(session->wire_buf, wirebuf_data_start, wirebuf_data_size);
+ } else {
+ memcpy(session->wire_buf, wirebuf_data_start, wirebuf_data_size);
+ }
+ session->wire_buf_start_idx = 0;
+ session->wire_buf_end_idx = wirebuf_data_size;
+}
+
+bool session_wirebuf_error(struct session *session)
+{
+ return session->sflags.wirebuf_error;
+}
+
+uint8_t *session_wirebuf_get_start(struct session *session)
+{
+ return session->wire_buf;
+}
+
+size_t session_wirebuf_get_size(struct session *session)
+{
+ return session->wire_buf_size;
+}
+
+uint8_t *session_wirebuf_get_free_start(struct session *session)
+{
+ return &session->wire_buf[session->wire_buf_end_idx];
+}
+
+size_t session_wirebuf_get_free_size(struct session *session)
+{
+ return session->wire_buf_size - session->wire_buf_end_idx;
+}
+
+void session_poison(struct session *session)
+{
+ kr_asan_poison(session, sizeof(*session));
+}
+
+void session_unpoison(struct session *session)
+{
+ kr_asan_unpoison(session, sizeof(*session));
+}
+
+int session_wirebuf_process(struct session *session, struct io_comm_data *comm)
+{
+ int ret = 0;
+ if (session->wire_buf_start_idx == session->wire_buf_end_idx)
+ return ret;
+
+ size_t wirebuf_data_size = session->wire_buf_end_idx - session->wire_buf_start_idx;
+ uint32_t max_iterations = (wirebuf_data_size /
+ (KNOT_WIRE_HEADER_SIZE + KNOT_WIRE_QUESTION_MIN_SIZE)) + 1;
+ knot_pkt_t *pkt = NULL;
+
+ while (((pkt = session_produce_packet(session, &the_worker->pkt_pool)) != NULL) &&
+ (ret < max_iterations)) {
+ if (kr_fails_assert(!session_wirebuf_error(session)))
+ return -1;
+ int res = worker_submit(session, comm, NULL, NULL, pkt);
+ /* Errors from worker_submit() are intentionally *not* handled in order to
+ * ensure the entire wire buffer is processed. */
+ if (res == kr_ok())
+ ret += 1;
+ if (session_discard_packet(session, pkt) < 0) {
+ /* Packet data isn't stored in memory as expected.
+ * something went wrong, normally should not happen. */
+ break;
+ }
+ }
+
+ /* worker_submit() may cause the session to close (e.g. due to IO
+ * write error when the packet triggers an immediate answer). This is
+ * an error state, as well as any wirebuf error. */
+ if (session->sflags.closing || session_wirebuf_error(session))
+ ret = -1;
+
+ return ret;
+}
+
+void session_kill_ioreq(struct session *session, struct qr_task *task)
+{
+ if (!session || session->sflags.closing)
+ return;
+ if (kr_fails_assert(session->sflags.outgoing && session->handle))
+ return;
+ session_tasklist_del(session, task);
+ if (session->handle->type == UV_UDP) {
+ session_close(session);
+ return;
+ }
+}
+
+/** Update timestamp */
+void session_touch(struct session *session)
+{
+ session->last_activity = kr_now();
+}
+
+uint64_t session_last_activity(struct session *session)
+{
+ return session->last_activity;
+}