2 * util/netevent.h - event notification
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39 * This file contains event notification functions.
41 * There are three types of communication points
42 * o UDP socket - perthread buffer.
43 * o TCP-accept socket - array of TCP-sockets, socketcount.
44 * o TCP socket - own buffer, parent-TCPaccept, read/write state,
45 * number of bytes read/written, timeout.
47 * There are sockets aimed towards our clients and towards the internet.
48 * o frontside - aimed towards our clients, queries come in, answers back.
49 * o behind - aimed towards internet, to the authoritative DNS servers.
51 * Several event types are available:
52 * o comm_base - for thread safety of the comm points, one per thread.
53 * o comm_point - udp and tcp networking, with callbacks.
54 * o comm_timer - a timeout with callback.
55 * o comm_signal - callbacks when signal is caught.
56 * o comm_reply - holds reply info during networking callback.
63 #include "dnscrypt/dnscrypt.h"
64 #ifdef HAVE_NGHTTP2_NGHTTP2_H
65 #include <nghttp2/nghttp2.h>
77 /* internal event notification data storage structure. */
78 struct internal_event;
80 struct internal_timer; /* A sub struct of the comm_timer super struct */
84 /** callback from communication point function type */
85 typedef int comm_point_callback_type(struct comm_point*, void*, int,
88 /** to pass no_error to callback function */
89 #define NETEVENT_NOERROR 0
90 /** to pass closed connection to callback function */
91 #define NETEVENT_CLOSED -1
92 /** to pass timeout happened to callback function */
93 #define NETEVENT_TIMEOUT -2
94 /** to pass fallback from capsforID to callback function; 0x20 failed */
95 #define NETEVENT_CAPSFAIL -3
96 /** to pass done transfer to callback function; http file is complete */
97 #define NETEVENT_DONE -4
98 /** to pass write of the write packet is done to callback function
99 * used when tcp_write_and_read is enabled */
100 #define NETEVENT_PKT_WRITTEN -5
102 /** timeout to slow accept calls when not possible, in msec. */
103 #define NETEVENT_SLOW_ACCEPT_TIME 2000
106 * A communication point dispatcher. Thread specific.
109 /** behind the scenes structure. with say libevent info. alloced */
110 struct internal_base* eb;
111 /** callback to stop listening on accept sockets,
112 * performed when accept() will not function properly */
113 void (*stop_accept)(void*);
114 /** callback to start listening on accept sockets, performed
115 * after stop_accept() then a timeout has passed. */
116 void (*start_accept)(void*);
117 /** user argument for stop_accept and start_accept functions */
122 * Reply information for a communication point.
125 /** the comm_point with fd to send reply on to. */
126 struct comm_point* c;
127 /** the address (for UDP based communication) */
128 struct sockaddr_storage addr;
129 /** length of address */
131 /** return type 0 (none), 4(IP4), 6(IP6) */
133 /* DnsCrypt context */
135 uint8_t client_nonce[crypto_box_HALF_NONCEBYTES];
136 uint8_t nmkey[crypto_box_BEFORENMBYTES];
137 const dnsccert *dnsc_cert;
140 /** the return source interface data */
143 struct in6_pktinfo v6info;
146 struct in_pktinfo v4info;
147 #elif defined(IP_RECVDSTADDR)
148 struct in_addr v4addr;
151 /** variable with return source data */
153 /** max udp size for udp packets */
158 * Communication point to the network
159 * These behaviours can be accomplished by setting the flags
160 * and passing return values from the callback.
161 * udp frontside: called after readdone. sendafter.
162 * tcp frontside: called readdone, sendafter. close.
163 * udp behind: called after readdone. No send after.
164 * tcp behind: write done, read done, then called. No send after.
167 /** behind the scenes structure, with say libevent info. alloced. */
168 struct internal_event* ev;
170 /** file descriptor for communication point */
173 /** timeout (NULL if it does not). Malloced. */
174 struct timeval* timeout;
176 /** buffer pointer. Either to perthread, or own buffer or NULL */
177 struct sldns_buffer* buffer;
179 /* -------- TCP Handler -------- */
180 /** Read/Write state for TCP */
182 /** The current read/write count for TCP */
183 size_t tcp_byte_count;
184 /** parent communication point (for TCP sockets) */
185 struct comm_point* tcp_parent;
186 /** sockaddr from peer, for TCP handlers */
187 struct comm_reply repinfo;
189 /* -------- TCP Accept -------- */
190 /** the number of TCP handlers for this tcp-accept socket */
192 /** current number of tcp handler in-use for this accept socket */
194 /** malloced array of tcp handlers for a tcp-accept,
195 of size max_tcp_count. */
196 struct comm_point** tcp_handlers;
197 /** linked list of free tcp_handlers to use for new queries.
198 For tcp_accept the first entry, for tcp_handlers the next one. */
199 struct comm_point* tcp_free;
201 /* -------- SSL TCP DNS ------- */
202 /** the SSL object with rw bio (owned) or for commaccept ctx ref */
204 /** handshake state for init and renegotiate */
206 /** no handshake, it has been done */
207 comm_ssl_shake_none = 0,
208 /** ssl initial handshake wants to read */
210 /** ssl initial handshake wants to write */
211 comm_ssl_shake_write,
212 /** ssl_write wants to read */
213 comm_ssl_shake_hs_read,
214 /** ssl_read wants to write */
215 comm_ssl_shake_hs_write
218 /* -------- HTTP ------- */
219 /** Do not allow connection to use HTTP version lower than this. 0=no
222 http_version_none = 0,
227 /* -------- HTTP/1.1 ------- */
228 /** Currently reading in http headers */
230 /** Currently reading in chunk headers, 0=not, 1=firstline, 2=unused
231 * (more lines), 3=trailer headers after chunk */
232 int http_in_chunk_headers;
233 /** chunked transfer */
235 /** http temp buffer (shared buffer for temporary work) */
236 struct sldns_buffer* http_temp;
237 /** http stored content in buffer */
239 /* -------- HTTP/2 ------- */
241 struct http2_session* h2_session;
242 /** set to 1 if h2 is negotiated to be used (using alpn) */
244 /** stream currently being handled */
245 struct http2_stream* h2_stream;
246 /** maximum allowed query buffer size, per stream */
247 size_t http2_stream_max_qbuffer_size;
248 /** maximum number of HTTP/2 streams per connection. Send in HTTP/2
250 uint32_t http2_max_streams;
252 /* -------- dnstap ------- */
253 /** the dnstap environment */
254 struct dt_env* dtenv;
256 /** is this a UDP, TCP-accept or TCP socket. */
257 enum comm_point_type {
258 /** UDP socket - handle datagrams. */
260 /** TCP accept socket - only creates handlers if readable. */
262 /** TCP handler socket - handle byteperbyte readwrite. */
264 /** HTTP handler socket */
266 /** AF_UNIX socket - for internal commands. */
268 /** raw - not DNS format - for pipe readers and writers */
271 /** variable with type of socket, UDP,TCP-accept,TCP,pipe */
274 /* ---------- Behaviour ----------- */
275 /** if set the connection is NOT closed on delete. */
278 /** if set, the connection is closed on error, on timeout,
279 and after read/write completes. No callback is done. */
282 /** flag that indicates the stream is both written and read from. */
283 int tcp_write_and_read;
285 /** byte count for written length over write channel, for when
286 * tcp_write_and_read is enabled. When tcp_write_and_read is enabled,
287 * this is the counter for writing, the one for reading is in the
288 * commpoint.buffer sldns buffer. The counter counts from 0 to
289 * 2+tcp_write_pkt_len, and includes the tcp length bytes. */
290 size_t tcp_write_byte_count;
292 /** packet to write currently over the write channel. for when
293 * tcp_write_and_read is enabled. When tcp_write_and_read is enabled,
294 * this is the buffer for the written packet, the commpoint.buffer
295 * sldns buffer is the buffer for the received packet. */
296 uint8_t* tcp_write_pkt;
297 /** length of tcp_write_pkt in bytes */
298 size_t tcp_write_pkt_len;
300 /** if set try to read another packet again (over connection with
301 * multiple packets), once set, tries once, then zero again,
302 * so set it in the packet complete section.
303 * The pointer itself has to be set before the callback is invoked,
304 * when you set things up, and continue to exist also after the
305 * commpoint is closed and deleted in your callback. So that after
306 * the callback cleans up netevent can see what it has to do.
307 * Or leave NULL if it is not used at all. */
308 int* tcp_more_read_again;
310 /** if set try to write another packet (over connection with
311 * multiple packets), once set, tries once, then zero again,
312 * so set it in the packet complete section.
313 * The pointer itself has to be set before the callback is invoked,
314 * when you set things up, and continue to exist also after the
315 * commpoint is closed and deleted in your callback. So that after
316 * the callback cleans up netevent can see what it has to do.
317 * Or leave NULL if it is not used at all. */
318 int* tcp_more_write_again;
320 /** if set, read/write completes:
321 read/write state of tcp is toggled.
322 buffer reset/bytecount reset.
324 So that when that is done the callback is called. */
325 int tcp_do_toggle_rw;
327 /** timeout in msec for TCP wait times for this connection */
328 int tcp_timeout_msec;
330 /** if set, tcp keepalive is enabled on this connection */
333 /** if set, checks for pending error from nonblocking connect() call.*/
334 int tcp_check_nb_connect;
336 /** if set, check for connection limit on tcp accept. */
337 struct tcl_list* tcp_conn_limit;
338 /** the entry for the connection. */
339 struct tcl_addr* tcl_addr;
341 /** the structure to keep track of open requests on this channel */
342 struct tcp_req_info* tcp_req_info;
344 #ifdef USE_MSG_FASTOPEN
345 /** used to track if the sendto() call should be done when using TFO. */
350 /** Is this a dnscrypt channel */
352 /** encrypted buffer pointer. Either to perthread, or own buffer or NULL */
353 struct sldns_buffer* dnscrypt_buffer;
355 /** number of queries outstanding on this socket, used by
356 * outside network for udp ports */
359 /** callback when done.
360 tcp_accept does not get called back, is NULL then.
361 If a timeout happens, callback with timeout=1 is called.
362 If an error happens, callback is called with error set
363 nonzero. If not NETEVENT_NOERROR, it is an errno value.
364 If the connection is closed (by remote end) then the
365 callback is called with error set to NETEVENT_CLOSED=-1.
366 If a timeout happens on the connection, the error is set to
368 The reply_info can be copied if the reply needs to happen at a
369 later time. It consists of a struct with commpoint and address.
370 It can be passed to a msg send routine some time later.
371 Note the reply information is temporary and must be copied.
372 NULL is passed for_reply info, in cases where error happened.
375 int my_callback(struct comm_point* c, void* my_arg, int error,
376 struct comm_reply *reply_info);
378 if the routine returns 0, nothing is done.
379 Notzero, the buffer will be sent back to client.
380 For UDP this is done without changing the commpoint.
381 In TCP it sets write state.
383 comm_point_callback_type* callback;
384 /** argument to pass to callback. */
389 * Structure only for making timeout events.
392 /** the internal event stuff (derived) */
393 struct internal_timer* ev_timer;
395 /** callback function, takes user arg only */
396 void (*callback)(void*);
398 /** callback user argument */
403 * Structure only for signal events.
406 /** the communication base */
407 struct comm_base* base;
409 /** the internal event stuff */
410 struct internal_signal* ev_signal;
412 /** callback function, takes signal number and user arg */
413 void (*callback)(int, void*);
415 /** callback user argument */
420 * Create a new comm base.
421 * @param sigs: if true it attempts to create a default loop for
423 * @return: the new comm base. NULL on error.
425 struct comm_base* comm_base_create(int sigs);
428 * Create comm base that uses the given ub_event_base (underlying pluggable
429 * event mechanism pointer).
430 * @param base: underlying pluggable event base.
431 * @return: the new comm base. NULL on error.
433 struct comm_base* comm_base_create_event(struct ub_event_base* base);
436 * Delete comm base structure but not the underlying lib event base.
437 * All comm points must have been deleted.
438 * @param b: the base to delete.
440 void comm_base_delete_no_base(struct comm_base* b);
443 * Destroy a comm base.
444 * All comm points must have been deleted.
445 * @param b: the base to delete.
447 void comm_base_delete(struct comm_base* b);
450 * Obtain two pointers. The pointers never change (until base_delete()).
451 * The pointers point to time values that are updated regularly.
452 * @param b: the communication base that will update the time values.
453 * @param tt: pointer to time in seconds is returned.
454 * @param tv: pointer to time in microseconds is returned.
456 void comm_base_timept(struct comm_base* b, time_t** tt, struct timeval** tv);
459 * Dispatch the comm base events.
460 * @param b: the communication to perform.
462 void comm_base_dispatch(struct comm_base* b);
465 * Exit from dispatch loop.
466 * @param b: the communication base that is in dispatch().
468 void comm_base_exit(struct comm_base* b);
471 * Set the slow_accept mode handlers. You can not provide these if you do
472 * not perform accept() calls.
473 * @param b: comm base
474 * @param stop_accept: function that stops listening to accept fds.
475 * @param start_accept: function that resumes listening to accept fds.
476 * @param arg: callback arg to pass to the functions.
478 void comm_base_set_slow_accept_handlers(struct comm_base* b,
479 void (*stop_accept)(void*), void (*start_accept)(void*), void* arg);
482 * Access internal data structure (for util/tube.c on windows)
483 * @param b: comm base
484 * @return ub_event_base.
486 struct ub_event_base* comm_base_internal(struct comm_base* b);
489 * Create an UDP comm point. Calls malloc.
490 * setups the structure with the parameters you provide.
491 * @param base: in which base to alloc the commpoint.
492 * @param fd : file descriptor of open UDP socket.
493 * @param buffer: shared buffer by UDP sockets from this thread.
494 * @param callback: callback function pointer.
495 * @param callback_arg: will be passed to your callback function.
496 * @return: returns the allocated communication point. NULL on error.
497 * Sets timeout to NULL. Turns off TCP options.
499 struct comm_point* comm_point_create_udp(struct comm_base* base,
500 int fd, struct sldns_buffer* buffer,
501 comm_point_callback_type* callback, void* callback_arg);
504 * Create an UDP with ancillary data comm point. Calls malloc.
505 * Uses recvmsg instead of recv to get udp message.
506 * setups the structure with the parameters you provide.
507 * @param base: in which base to alloc the commpoint.
508 * @param fd : file descriptor of open UDP socket.
509 * @param buffer: shared buffer by UDP sockets from this thread.
510 * @param callback: callback function pointer.
511 * @param callback_arg: will be passed to your callback function.
512 * @return: returns the allocated communication point. NULL on error.
513 * Sets timeout to NULL. Turns off TCP options.
515 struct comm_point* comm_point_create_udp_ancil(struct comm_base* base,
516 int fd, struct sldns_buffer* buffer,
517 comm_point_callback_type* callback, void* callback_arg);
520 * Create a TCP listener comm point. Calls malloc.
521 * Setups the structure with the parameters you provide.
522 * Also Creates TCP Handlers, pre allocated for you.
523 * Uses the parameters you provide.
524 * @param base: in which base to alloc the commpoint.
525 * @param fd: file descriptor of open TCP socket set to listen nonblocking.
526 * @param num: becomes max_tcp_count, the routine allocates that
527 * many tcp handler commpoints.
528 * @param idle_timeout: TCP idle timeout in ms.
529 * @param harden_large_queries: whether query size should be limited.
530 * @param http_max_streams: maximum number of HTTP/2 streams per connection.
531 * @param http_endpoint: HTTP endpoint to service queries on
532 * @param tcp_conn_limit: TCP connection limit info.
533 * @param bufsize: size of buffer to create for handlers.
534 * @param spoolbuf: shared spool buffer for tcp_req_info structures.
535 * or NULL to not create those structures in the tcp handlers.
536 * @param port_type: the type of port we are creating a TCP listener for. Used
537 * to select handler type to use.
538 * @param callback: callback function pointer for TCP handlers.
539 * @param callback_arg: will be passed to your callback function.
540 * @return: returns the TCP listener commpoint. You can find the
541 * TCP handlers in the array inside the listener commpoint.
542 * returns NULL on error.
543 * Inits timeout to NULL. All handlers are on the free list.
545 struct comm_point* comm_point_create_tcp(struct comm_base* base,
546 int fd, int num, int idle_timeout, int harden_large_queries,
547 uint32_t http_max_streams, char* http_endpoint,
548 struct tcl_list* tcp_conn_limit,
549 size_t bufsize, struct sldns_buffer* spoolbuf,
550 enum listen_type port_type,
551 comm_point_callback_type* callback, void* callback_arg);
554 * Create an outgoing TCP commpoint. No file descriptor is opened, left at -1.
555 * @param base: in which base to alloc the commpoint.
556 * @param bufsize: size of buffer to create for handlers.
557 * @param callback: callback function pointer for the handler.
558 * @param callback_arg: will be passed to your callback function.
559 * @return: the commpoint or NULL on error.
561 struct comm_point* comm_point_create_tcp_out(struct comm_base* base,
562 size_t bufsize, comm_point_callback_type* callback, void* callback_arg);
565 * Create an outgoing HTTP commpoint. No file descriptor is opened, left at -1.
566 * @param base: in which base to alloc the commpoint.
567 * @param bufsize: size of buffer to create for handlers.
568 * @param callback: callback function pointer for the handler.
569 * @param callback_arg: will be passed to your callback function.
570 * @param temp: sldns buffer, shared between other http_out commpoints, for
571 * temporary data when performing callbacks.
572 * @return: the commpoint or NULL on error.
574 struct comm_point* comm_point_create_http_out(struct comm_base* base,
575 size_t bufsize, comm_point_callback_type* callback,
576 void* callback_arg, struct sldns_buffer* temp);
579 * Create commpoint to listen to a local domain file descriptor.
580 * @param base: in which base to alloc the commpoint.
581 * @param fd: file descriptor of open AF_UNIX socket set to listen nonblocking.
582 * @param bufsize: size of buffer to create for handlers.
583 * @param callback: callback function pointer for the handler.
584 * @param callback_arg: will be passed to your callback function.
585 * @return: the commpoint or NULL on error.
587 struct comm_point* comm_point_create_local(struct comm_base* base,
588 int fd, size_t bufsize,
589 comm_point_callback_type* callback, void* callback_arg);
592 * Create commpoint to listen to a local domain pipe descriptor.
593 * @param base: in which base to alloc the commpoint.
594 * @param fd: file descriptor.
595 * @param writing: true if you want to listen to writes, false for reads.
596 * @param callback: callback function pointer for the handler.
597 * @param callback_arg: will be passed to your callback function.
598 * @return: the commpoint or NULL on error.
600 struct comm_point* comm_point_create_raw(struct comm_base* base,
602 comm_point_callback_type* callback, void* callback_arg);
605 * Close a comm point fd.
606 * @param c: comm point to close.
608 void comm_point_close(struct comm_point* c);
611 * Close and deallocate (free) the comm point. If the comm point is
612 * a tcp-accept point, also its tcp-handler points are deleted.
613 * @param c: comm point to delete.
615 void comm_point_delete(struct comm_point* c);
618 * Send reply. Put message into commpoint buffer.
619 * @param repinfo: The reply info copied from a commpoint callback call.
621 void comm_point_send_reply(struct comm_reply* repinfo);
624 * Drop reply. Cleans up.
625 * @param repinfo: The reply info copied from a commpoint callback call.
627 void comm_point_drop_reply(struct comm_reply* repinfo);
630 * Send an udp message over a commpoint.
631 * @param c: commpoint to send it from.
632 * @param packet: what to send.
633 * @param addr: where to send it to. If NULL, send is performed,
634 * for connected sockets, to the connected address.
635 * @param addrlen: length of addr.
636 * @param is_connected: if the UDP socket is connect()ed.
637 * @return: false on a failure.
639 int comm_point_send_udp_msg(struct comm_point* c, struct sldns_buffer* packet,
640 struct sockaddr* addr, socklen_t addrlen,int is_connected);
643 * Stop listening for input on the commpoint. No callbacks will happen.
644 * @param c: commpoint to disable. The fd is not closed.
646 void comm_point_stop_listening(struct comm_point* c);
649 * Start listening again for input on the comm point.
650 * @param c: commpoint to enable again.
651 * @param newfd: new fd, or -1 to leave fd be.
652 * @param msec: timeout in milliseconds, or -1 for no (change to the) timeout.
655 void comm_point_start_listening(struct comm_point* c, int newfd, int msec);
658 * Stop listening and start listening again for reading or writing.
659 * @param c: commpoint
660 * @param rd: if true, listens for reading.
661 * @param wr: if true, listens for writing.
663 void comm_point_listen_for_rw(struct comm_point* c, int rd, int wr);
666 * Get size of memory used by comm point.
667 * For TCP handlers this includes subhandlers.
668 * For UDP handlers, this does not include the (shared) UDP buffer.
669 * @param c: commpoint.
670 * @return size in bytes.
672 size_t comm_point_get_mem(struct comm_point* c);
675 * create timer. Not active upon creation.
676 * @param base: event handling base.
677 * @param cb: callback function: void myfunc(void* myarg);
678 * @param cb_arg: user callback argument.
679 * @return: the new timer or NULL on error.
681 struct comm_timer* comm_timer_create(struct comm_base* base,
682 void (*cb)(void*), void* cb_arg);
685 * disable timer. Stops callbacks from happening.
686 * @param timer: to disable.
688 void comm_timer_disable(struct comm_timer* timer);
691 * reset timevalue for timer.
692 * @param timer: timer to (re)set.
693 * @param tv: when the timer should activate. if NULL timer is disabled.
695 void comm_timer_set(struct comm_timer* timer, struct timeval* tv);
699 * @param timer: to delete.
701 void comm_timer_delete(struct comm_timer* timer);
704 * see if timeout has been set to a value.
705 * @param timer: the timer to examine.
706 * @return: false if disabled or not set.
708 int comm_timer_is_set(struct comm_timer* timer);
711 * Get size of memory used by comm timer.
712 * @param timer: the timer to examine.
713 * @return size in bytes.
715 size_t comm_timer_get_mem(struct comm_timer* timer);
718 * Create a signal handler. Call signal_bind() later to bind to a signal.
719 * @param base: communication base to use.
720 * @param callback: called when signal is caught.
721 * @param cb_arg: user argument to callback
722 * @return: the signal struct or NULL on error.
724 struct comm_signal* comm_signal_create(struct comm_base* base,
725 void (*callback)(int, void*), void* cb_arg);
728 * Bind signal struct to catch a signal. A signle comm_signal can be bound
729 * to multiple signals, calling comm_signal_bind multiple times.
730 * @param comsig: the communication point, with callback information.
731 * @param sig: signal number.
732 * @return: true on success. false on error.
734 int comm_signal_bind(struct comm_signal* comsig, int sig);
737 * Delete the signal communication point.
738 * @param comsig: to delete.
740 void comm_signal_delete(struct comm_signal* comsig);
743 * perform accept(2) with error checking.
744 * @param c: commpoint with accept fd.
745 * @param addr: remote end returned here.
746 * @param addrlen: length of remote end returned here.
747 * @return new fd, or -1 on error.
748 * if -1, error message has been printed if necessary, simply drop
749 * out of the reading handler.
751 int comm_point_perform_accept(struct comm_point* c,
752 struct sockaddr_storage* addr, socklen_t* addrlen);
754 /**** internal routines ****/
757 * This routine is published for checks and tests, and is only used internally.
758 * handle libevent callback for udp comm point.
759 * @param fd: file descriptor.
760 * @param event: event bits from libevent:
761 * EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
762 * @param arg: the comm_point structure.
764 void comm_point_udp_callback(int fd, short event, void* arg);
767 * This routine is published for checks and tests, and is only used internally.
768 * handle libevent callback for udp ancillary data comm point.
769 * @param fd: file descriptor.
770 * @param event: event bits from libevent:
771 * EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
772 * @param arg: the comm_point structure.
774 void comm_point_udp_ancil_callback(int fd, short event, void* arg);
777 * This routine is published for checks and tests, and is only used internally.
778 * handle libevent callback for tcp accept comm point
779 * @param fd: file descriptor.
780 * @param event: event bits from libevent:
781 * EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
782 * @param arg: the comm_point structure.
784 void comm_point_tcp_accept_callback(int fd, short event, void* arg);
787 * This routine is published for checks and tests, and is only used internally.
788 * handle libevent callback for tcp data comm point
789 * @param fd: file descriptor.
790 * @param event: event bits from libevent:
791 * EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
792 * @param arg: the comm_point structure.
794 void comm_point_tcp_handle_callback(int fd, short event, void* arg);
797 * This routine is published for checks and tests, and is only used internally.
798 * handle libevent callback for tcp data comm point
799 * @param fd: file descriptor.
800 * @param event: event bits from libevent:
801 * EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
802 * @param arg: the comm_point structure.
804 void comm_point_http_handle_callback(int fd, short event, void* arg);
807 * HTTP2 session. HTTP2 related info per comm point.
809 struct http2_session {
810 /** first item in list of streams */
811 struct http2_stream* first_stream;
813 /** nghttp2 session */
814 nghttp2_session *session;
815 /** store nghttp2 callbacks for easy reuse */
816 nghttp2_session_callbacks* callbacks;
818 /** comm point containing buffer used to build answer in worker or
820 struct comm_point* c;
821 /** session is instructed to get dropped (comm port will be closed) */
823 /** postpone dropping the session, can be used to prevent dropping
824 * while being in a callback */
828 /** enum of HTTP status */
830 HTTP_STATUS_OK = 200,
831 HTTP_STATUS_BAD_REQUEST = 400,
832 HTTP_STATUS_NOT_FOUND = 404,
833 HTTP_STATUS_PAYLOAD_TOO_LARGE = 413,
834 HTTP_STATUS_URI_TOO_LONG = 414,
835 HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE = 415,
836 HTTP_STATUS_NOT_IMPLEMENTED = 501
840 * HTTP stream. Part of list of HTTP2 streams per session.
842 struct http2_stream {
843 /** next stream in list per session */
844 struct http2_stream* next;
845 /** previous stream in list per session */
846 struct http2_stream* prev;
847 /** HTTP2 stream ID is an unsigned 31-bit integer */
849 /** HTTP method used for this stream */
851 HTTP_METHOD_POST = 1,
853 HTTP_METHOD_UNSUPPORTED
855 /** message contains invalid content type */
856 int invalid_content_type;
857 /** message body content type */
858 size_t content_length;
859 /** HTTP response status */
860 enum http_status status;
861 /** request for non existing endpoint */
862 int invalid_endpoint;
863 /** query in request is too large */
865 /** buffer to store query into. Can't use session shared buffer as query
866 * can arrive in parts, intertwined with frames for other queries. */
867 struct sldns_buffer* qbuffer;
868 /** buffer to store response into. Can't use shared buffer as a next
869 * query read callback can overwrite it before it is send out. */
870 struct sldns_buffer* rbuffer;
871 /** mesh area containing mesh state */
872 struct mesh_area* mesh;
873 /** mesh state for query. Used to remove mesh reply before closing
875 struct mesh_state* mesh_state;
879 /** nghttp2 receive cb. Read from SSL connection into nghttp2 buffer */
880 ssize_t http2_recv_cb(nghttp2_session* session, uint8_t* buf,
881 size_t len, int flags, void* cb_arg);
882 /** nghttp2 send callback. Send from nghttp2 buffer to ssl socket */
883 ssize_t http2_send_cb(nghttp2_session* session, const uint8_t* buf,
884 size_t len, int flags, void* cb_arg);
885 /** nghttp2 callback on closing stream */
886 int http2_stream_close_cb(nghttp2_session* session, int32_t stream_id,
887 uint32_t error_code, void* cb_arg);
891 * Create new http2 stream
892 * @param stream_id: ID for stream to create.
893 * @return malloc'ed stream, NULL on error
895 struct http2_stream* http2_stream_create(int32_t stream_id);
898 * Add new stream to session linked list
899 * @param h2_session: http2 session to add stream to
900 * @param h2_stream: stream to add to session list
902 void http2_session_add_stream(struct http2_session* h2_session,
903 struct http2_stream* h2_stream);
905 /** Add mesh state to stream. To be able to remove mesh reply on stream closure
907 void http2_stream_add_meshstate(struct http2_stream* h2_stream,
908 struct mesh_area* mesh, struct mesh_state* m);
911 * This routine is published for checks and tests, and is only used internally.
912 * handle libevent callback for timer comm.
913 * @param fd: file descriptor (always -1).
914 * @param event: event bits from libevent:
915 * EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
916 * @param arg: the comm_timer structure.
918 void comm_timer_callback(int fd, short event, void* arg);
921 * This routine is published for checks and tests, and is only used internally.
922 * handle libevent callback for signal comm.
923 * @param fd: file descriptor (used for the signal number).
924 * @param event: event bits from libevent:
925 * EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
926 * @param arg: the internal commsignal structure.
928 void comm_signal_callback(int fd, short event, void* arg);
931 * This routine is published for checks and tests, and is only used internally.
932 * libevent callback for AF_UNIX fds
933 * @param fd: file descriptor.
934 * @param event: event bits from libevent:
935 * EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
936 * @param arg: the comm_point structure.
938 void comm_point_local_handle_callback(int fd, short event, void* arg);
941 * This routine is published for checks and tests, and is only used internally.
942 * libevent callback for raw fd access.
943 * @param fd: file descriptor.
944 * @param event: event bits from libevent:
945 * EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
946 * @param arg: the comm_point structure.
948 void comm_point_raw_handle_callback(int fd, short event, void* arg);
951 * This routine is published for checks and tests, and is only used internally.
952 * libevent callback for timeout on slow accept.
953 * @param fd: file descriptor.
954 * @param event: event bits from libevent:
955 * EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
956 * @param arg: the comm_point structure.
958 void comm_base_handle_slow_accept(int fd, short event, void* arg);
962 * Callback for openssl BIO to on windows detect WSAEWOULDBLOCK and notify
963 * the winsock_event of this for proper TCP nonblocking implementation.
964 * @param c: comm_point, fd must be set its struct event is registered.
965 * @param ssl: openssl SSL, fd must be set so it has a bio.
967 void comm_point_tcp_win_bio_cb(struct comm_point* c, void* ssl);
971 * See if errno for tcp connect has to be logged or not. This uses errno
972 * @param addr: apart from checking errno, the addr is checked for ip4mapped
973 * and broadcast type, hence passed.
974 * @param addrlen: length of the addr parameter.
975 * @return true if it needs to be logged.
977 int tcp_connect_errno_needs_log(struct sockaddr* addr, socklen_t addrlen);
981 * True if the ssl handshake error has to be squelched from the logs
982 * @param err: the error returned by the openssl routine, ERR_get_error.
983 * This is a packed structure with elements that are examined.
984 * @return true if the error is squelched (not logged).
986 int squelch_err_ssl_handshake(unsigned long err);
989 #endif /* NET_EVENT_H */