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-rw-r--r--src/output/dnssim/internal.h343
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diff --git a/src/output/dnssim/internal.h b/src/output/dnssim/internal.h
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-/*
- * Copyright (c) 2019-2020, CZ.NIC, z.s.p.o.
- * All rights reserved.
- *
- * This file is part of dnsjit.
- *
- * dnsjit 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.
- *
- * dnsjit 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 dnsjit. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef __dnsjit_output_dnssim_internal_h
-#define __dnsjit_output_dnssim_internal_h
-
-#include <gnutls/gnutls.h>
-#include <nghttp2/nghttp2.h>
-#include <uv.h>
-#include "core/object/dns.h"
-#include "core/object/payload.h"
-
-#define DNSSIM_MIN_GNUTLS_VERSION 0x030603
-#define DNSSIM_MIN_GNUTLS_ERRORMSG "dnssim tls/https2 transport requires GnuTLS >= 3.6.3"
-
-#define _self ((_output_dnssim_t*)self)
-#define _ERR_MALFORMED -2
-#define _ERR_MSGID -3
-#define _ERR_TC -4
-#define _ERR_QUESTION -5
-
-#define _MAX_URI_LEN 65536
-#define MAX_DNSMSG_SIZE 65535
-#define WIRE_BUF_SIZE (MAX_DNSMSG_SIZE + 2 + 16384) /** max tcplen + 2b tcplen + 16kb tls record */
-
-typedef struct _output_dnssim_request _output_dnssim_request_t;
-typedef struct _output_dnssim_connection _output_dnssim_connection_t;
-typedef struct _output_dnssim_client _output_dnssim_client_t;
-
-/*
- * Query-related structures.
- */
-
-typedef struct _output_dnssim_query _output_dnssim_query_t;
-struct _output_dnssim_query {
- /*
- * Next query in the list.
- *
- * Currently, next is used for TCP clients/connection, which makes it
- * impossible to use for tracking multiple queries of a single request.
- *
- * TODO: refactor the linked lists to allow query to be part of multiple lists
- */
- _output_dnssim_query_t* next;
-
- output_dnssim_transport_t transport;
- _output_dnssim_request_t* req;
-
- /* Query state, currently used only for TCP. */
- enum {
- _OUTPUT_DNSSIM_QUERY_PENDING_WRITE,
- _OUTPUT_DNSSIM_QUERY_PENDING_WRITE_CB,
- _OUTPUT_DNSSIM_QUERY_PENDING_CLOSE,
- _OUTPUT_DNSSIM_QUERY_WRITE_FAILED,
- _OUTPUT_DNSSIM_QUERY_SENT,
- _OUTPUT_DNSSIM_QUERY_ORPHANED
- } state;
-};
-
-typedef struct _output_dnssim_query_udp _output_dnssim_query_udp_t;
-struct _output_dnssim_query_udp {
- _output_dnssim_query_t qry;
-
- uv_udp_t* handle;
- uv_buf_t buf;
-};
-
-typedef struct _output_dnssim_query_tcp _output_dnssim_query_tcp_t;
-struct _output_dnssim_query_tcp {
- _output_dnssim_query_t qry;
-
- /* Connection this query is assigned to. */
- _output_dnssim_connection_t* conn;
-
- uv_write_t write_req;
-
- /* Send buffers for libuv; 0 is for dnslen, 1 is for dnsmsg. */
- uv_buf_t bufs[2];
-
- /* HTTP/2 stream id that was used to send this query. */
- int32_t stream_id;
-
- /* HTTP/2 expected content length. */
- int32_t content_len;
-
- /* Receive buffer (currently used only by HTTP/2). */
- uint8_t* recv_buf;
- ssize_t recv_buf_len;
-};
-
-struct _output_dnssim_request {
- /* List of queries associated with this request. */
- _output_dnssim_query_t* qry;
-
- /* Client this request belongs to. */
- _output_dnssim_client_t* client;
-
- /* The DNS question to be resolved. */
- core_object_payload_t* payload;
- core_object_dns_t* dns_q;
- const uint8_t* question;
- ssize_t question_len;
-
- /* Timestamps for latency calculation. */
- uint64_t created_at;
- uint64_t ended_at;
-
- /* Timer for tracking timeout of the request. */
- uv_timer_t* timer;
-
- /* The output component of this request. */
- output_dnssim_t* dnssim;
-
- /* State of the request. */
- enum {
- _OUTPUT_DNSSIM_REQ_ONGOING,
- _OUTPUT_DNSSIM_REQ_CLOSING
- } state;
-
- /* Statistics interval in which this request is tracked. */
- output_dnssim_stats_t* stats;
-};
-
-/*
- * Connection-related structures.
- */
-
-/* Read-state of connection's data stream. */
-typedef enum _output_dnssim_read_state {
- _OUTPUT_DNSSIM_READ_STATE_CLEAN,
- _OUTPUT_DNSSIM_READ_STATE_DNSLEN, /* Expecting bytes of dnslen. */
- _OUTPUT_DNSSIM_READ_STATE_DNSMSG, /* Expecting bytes of dnsmsg. */
- _OUTPUT_DNSSIM_READ_STATE_INVALID
-} _output_dnssim_read_state_t;
-
-/* TLS-related data for a single connection. */
-typedef struct _output_dnssim_tls_ctx {
- gnutls_session_t session;
- uint8_t* buf;
- ssize_t buf_len;
- ssize_t buf_pos;
- size_t write_queue_size;
-} _output_dnssim_tls_ctx_t;
-
-/* HTTP2 context for a single connection. */
-typedef struct _output_dnssim_http2_ctx {
- nghttp2_session* session;
-
- /* Query to which the dnsbuf currently being processed belongs to. */
- _output_dnssim_query_tcp_t* current_qry;
-
- /* Maximum number of concurrent and currently open streams. */
- uint32_t max_concurrent_streams;
- uint32_t open_streams;
-
- /* Flag indicating whether we received the peer's initial SETTINGS frame. */
- bool remote_settings_received;
-} _output_dnssim_http2_ctx_t;
-
-struct _output_dnssim_connection {
- _output_dnssim_connection_t* next;
-
- uv_tcp_t* handle;
-
- /* Timeout timer for establishing the connection. */
- uv_timer_t* handshake_timer;
-
- /* Idle timer for connection reuse. rfc7766#section-6.2.3 */
- uv_timer_t* idle_timer;
- bool is_idle;
-
- /* List of queries that have been queued (pending write callback). */
- _output_dnssim_query_t* queued;
-
- /* List of queries that have been sent over this connection. */
- _output_dnssim_query_t* sent;
-
- /* Client this connection belongs to. */
- _output_dnssim_client_t* client;
-
- /* State of the connection.
- * Numeric ordering of constants is significant and follows the typical connection lifecycle.
- * Ensure new states are added to a proper place. */
- enum {
- _OUTPUT_DNSSIM_CONN_INITIALIZED = 0,
- _OUTPUT_DNSSIM_CONN_TCP_HANDSHAKE = 10,
- _OUTPUT_DNSSIM_CONN_TLS_HANDSHAKE = 20,
- _OUTPUT_DNSSIM_CONN_ACTIVE = 30,
- _OUTPUT_DNSSIM_CONN_CONGESTED = 35,
- _OUTPUT_DNSSIM_CONN_CLOSE_REQUESTED = 38,
- _OUTPUT_DNSSIM_CONN_CLOSING = 40,
- _OUTPUT_DNSSIM_CONN_CLOSED = 50
- } state;
-
- /* State of the data stream read. */
- _output_dnssim_read_state_t read_state;
-
- /* Total length of the expected dns data (either 2 for dnslen, or dnslen itself). */
- size_t dnsbuf_len;
-
- /* Current position in the receive dns buffer. */
- size_t dnsbuf_pos;
-
- /* Receive buffer used for incomplete messages or dnslen. */
- char* dnsbuf_data;
- bool dnsbuf_free_after_use;
-
- /* Statistics interval in which the handshake is tracked. */
- output_dnssim_stats_t* stats;
-
- /* TLS-related data. */
- _output_dnssim_tls_ctx_t* tls;
-
- /* HTTP/2-related data. */
- _output_dnssim_http2_ctx_t* http2;
-
- /* Prevents immediate closure of connection. Instead, connection is moved
- * to CLOSE_REQUESTED state and setter of this flag is responsible for
- * closing the connection when clearing this flag. */
- bool prevent_close;
-};
-
-/*
- * Client structure.
- */
-
-struct _output_dnssim_client {
- /* Dnssim component this client belongs to. */
- output_dnssim_t* dnssim;
-
- /* List of connections.
- * Multiple connections may be used (e.g. some are already closed for writing).
- */
- _output_dnssim_connection_t* conn;
-
- /* List of queries that are pending to be sent over any available connection. */
- _output_dnssim_query_t* pending;
-
- /* TLS-ticket for session resumption. */
- gnutls_datum_t tls_ticket;
-};
-
-/*
- * DnsSim-related structures.
- */
-
-typedef struct _output_dnssim_source _output_dnssim_source_t;
-struct _output_dnssim_source {
- _output_dnssim_source_t* next;
- struct sockaddr_storage addr;
-};
-
-typedef struct _output_dnssim _output_dnssim_t;
-struct _output_dnssim {
- output_dnssim_t pub;
-
- uv_loop_t loop;
- uv_timer_t stats_timer;
-
- struct sockaddr_storage target;
- _output_dnssim_source_t* source;
- output_dnssim_transport_t transport;
-
- char h2_uri_authority[_MAX_URI_LEN];
- char h2_uri_path[_MAX_URI_LEN];
- bool h2_zero_out_msgid;
- output_dnssim_h2_method_t h2_method;
-
- /* Array of clients, mapped by client ID (ranges from 0 to max_clients). */
- _output_dnssim_client_t* client_arr;
-
- gnutls_priority_t* tls_priority;
- gnutls_certificate_credentials_t tls_cred;
- char wire_buf[WIRE_BUF_SIZE]; /* thread-local buffer for processing tls input */
-};
-
-/* Provides data for HTTP/2 data frames. */
-typedef struct {
- const uint8_t* buf;
- size_t len;
-} _output_dnssim_https2_data_provider_t;
-
-/*
- * Forward function declarations.
- */
-
-int _output_dnssim_bind_before_connect(output_dnssim_t* self, uv_handle_t* handle);
-int _output_dnssim_create_query_udp(output_dnssim_t* self, _output_dnssim_request_t* req);
-int _output_dnssim_create_query_tcp(output_dnssim_t* self, _output_dnssim_request_t* req);
-void _output_dnssim_close_query_udp(_output_dnssim_query_udp_t* qry);
-void _output_dnssim_close_query_tcp(_output_dnssim_query_tcp_t* qry);
-int _output_dnssim_answers_request(_output_dnssim_request_t* req, core_object_dns_t* response);
-void _output_dnssim_request_answered(_output_dnssim_request_t* req, core_object_dns_t* msg);
-void _output_dnssim_maybe_free_request(_output_dnssim_request_t* req);
-void _output_dnssim_on_uv_alloc(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buf);
-void _output_dnssim_create_request(output_dnssim_t* self, _output_dnssim_client_t* client, core_object_payload_t* payload);
-int _output_dnssim_handle_pending_queries(_output_dnssim_client_t* client);
-int _output_dnssim_tcp_connect(output_dnssim_t* self, _output_dnssim_connection_t* conn);
-void _output_dnssim_tcp_close(_output_dnssim_connection_t* conn);
-void _output_dnssim_tcp_write_query(_output_dnssim_connection_t* conn, _output_dnssim_query_tcp_t* qry);
-void _output_dnssim_conn_close(_output_dnssim_connection_t* conn);
-void _output_dnssim_conn_idle(_output_dnssim_connection_t* conn);
-int _output_dnssim_handle_pending_queries(_output_dnssim_client_t* client);
-void _output_dnssim_conn_activate(_output_dnssim_connection_t* conn);
-void _output_dnssim_conn_maybe_free(_output_dnssim_connection_t* conn);
-void _output_dnssim_read_dns_stream(_output_dnssim_connection_t* conn, size_t len, const char* data);
-void _output_dnssim_read_dnsmsg(_output_dnssim_connection_t* conn, size_t len, const char* data);
-
-#if GNUTLS_VERSION_NUMBER >= DNSSIM_MIN_GNUTLS_VERSION
-int _output_dnssim_create_query_tls(output_dnssim_t* self, _output_dnssim_request_t* req);
-void _output_dnssim_close_query_tls(_output_dnssim_query_tcp_t* qry);
-int _output_dnssim_tls_init(_output_dnssim_connection_t* conn);
-void _output_dnssim_tls_process_input_data(_output_dnssim_connection_t* conn);
-void _output_dnssim_tls_close(_output_dnssim_connection_t* conn);
-void _output_dnssim_tls_write_query(_output_dnssim_connection_t* conn, _output_dnssim_query_tcp_t* qry);
-
-int _output_dnssim_create_query_https2(output_dnssim_t* self, _output_dnssim_request_t* req);
-void _output_dnssim_close_query_https2(_output_dnssim_query_tcp_t* qry);
-int _output_dnssim_https2_init(_output_dnssim_connection_t* conn);
-int _output_dnssim_https2_setup(_output_dnssim_connection_t* conn);
-void _output_dnssim_https2_process_input_data(_output_dnssim_connection_t* conn, size_t len, const char* data);
-void _output_dnssim_https2_close(_output_dnssim_connection_t* conn);
-void _output_dnssim_https2_write_query(_output_dnssim_connection_t* conn, _output_dnssim_query_tcp_t* qry);
-#endif
-
-#endif
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