unbound/util/netevent.h

   1 /*
   2  * util/netevent.h - event notification
   3  *
   4  * Copyright (c) 2007, NLnet Labs. All rights reserved.
   5  *
   6  * This software is open source.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * Redistributions of source code must retain the above copyright notice,
  13  * this list of conditions and the following disclaimer.
  14  *
  15  * Redistributions in binary form must reproduce the above copyright notice,
  16  * this list of conditions and the following disclaimer in the documentation
  17  * and/or other materials provided with the distribution.
  18  *
  19  * Neither the name of the NLNET LABS nor the names of its contributors may
  20  * be used to endorse or promote products derived from this software without
  21  * specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  29  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 /**
  37  * \file
  38  *
  39  * This file contains event notification functions.
  40  *
  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.
  46  *
  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.
  50  *
  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.
  57  *
  58  */
  59
  60 #ifndef NET_EVENT_H
  61 #define NET_EVENT_H
  62
  63 struct sldns_buffer;
  64 struct comm_point;
  65 struct comm_reply;
  66 struct event_base;
  67
  68 /* internal event notification data storage structure. */
  69 struct internal_event;
  70 struct internal_base;
  71 struct internal_timer;
  72
  73 /** callback from communication point function type */
  74 typedef int comm_point_callback_t(struct comm_point*, void*, int,
  75         struct comm_reply*);
  76
  77 /** to pass no_error to callback function */
  78 #define NETEVENT_NOERROR 0
  79 /** to pass closed connection to callback function */
  80 #define NETEVENT_CLOSED -1
  81 /** to pass timeout happened to callback function */
  82 #define NETEVENT_TIMEOUT -2
  83 /** to pass fallback from capsforID to callback function; 0x20 failed */
  84 #define NETEVENT_CAPSFAIL -3
  85
  86 /** timeout to slow accept calls when not possible, in msec. */
  87 #define NETEVENT_SLOW_ACCEPT_TIME 2000
  88
  89 /**
  90  * A communication point dispatcher. Thread specific.
  91  */
  92 struct comm_base {
  93         /** behind the scenes structure. with say libevent info. alloced */
  94         struct internal_base* eb;
  95         /** callback to stop listening on accept sockets,
  96          * performed when accept() will not function properly */
  97         void (*stop_accept)(void*);
  98         /** callback to start listening on accept sockets, performed
  99          * after stop_accept() then a timeout has passed. */
 100         void (*start_accept)(void*);
 101         /** user argument for stop_accept and start_accept functions */
 102         void* cb_arg;
 103 };
 104
 105 /**
 106  * Reply information for a communication point.
 107  */
 108 struct comm_reply {
 109         /** the comm_point with fd to send reply on to. */
 110         struct comm_point* c;
 111         /** the address (for UDP based communication) */
 112         struct sockaddr_storage addr;
 113         /** length of address */
 114         socklen_t addrlen;
 115         /** return type 0 (none), 4(IP4), 6(IP6) */
 116         int srctype;
 117         /** the return source interface data */
 118         union {
 119 #ifdef IPV6_PKTINFO
 120                 struct in6_pktinfo v6info;
 121 #endif
 122 #ifdef IP_PKTINFO
 123                 struct in_pktinfo v4info;
 124 #elif defined(IP_RECVDSTADDR)
 125                 struct in_addr v4addr;
 126 #endif
 127         }
 128                 /** variable with return source data */
 129                 pktinfo;
 130 };
 131
 132 /**
 133  * Communication point to the network
 134  * These behaviours can be accomplished by setting the flags
 135  * and passing return values from the callback.
 136  *    udp frontside: called after readdone. sendafter.
 137  *    tcp frontside: called readdone, sendafter. close.
 138  *    udp behind: called after readdone. No send after.
 139  *    tcp behind: write done, read done, then called. No send after.
 140  */
 141 struct comm_point {
 142         /** behind the scenes structure, with say libevent info. alloced. */
 143         struct internal_event* ev;
 144
 145         /** file descriptor for communication point */
 146         int fd;
 147
 148         /** timeout (NULL if it does not). Malloced. */
 149         struct timeval* timeout;
 150
 151         /** buffer pointer. Either to perthread, or own buffer or NULL */
 152         struct sldns_buffer* buffer;
 153
 154         /* -------- TCP Handler -------- */
 155         /** Read/Write state for TCP */
 156         int tcp_is_reading;
 157         /** The current read/write count for TCP */
 158         size_t tcp_byte_count;
 159         /** parent communication point (for TCP sockets) */
 160         struct comm_point* tcp_parent;
 161         /** sockaddr from peer, for TCP handlers */
 162         struct comm_reply repinfo;
 163
 164         /* -------- TCP Accept -------- */
 165         /** the number of TCP handlers for this tcp-accept socket */
 166         int max_tcp_count;
 167         /** malloced array of tcp handlers for a tcp-accept,
 168             of size max_tcp_count. */
 169         struct comm_point** tcp_handlers;
 170         /** linked list of free tcp_handlers to use for new queries.
 171             For tcp_accept the first entry, for tcp_handlers the next one. */
 172         struct comm_point* tcp_free;
 173
 174         /* -------- SSL TCP DNS ------- */
 175         /** the SSL object with rw bio (owned) or for commaccept ctx ref */
 176         void* ssl;
 177         /** handshake state for init and renegotiate */
 178         enum {
 179                 /** no handshake, it has been done */
 180                 comm_ssl_shake_none = 0,
 181                 /** ssl initial handshake wants to read */
 182                 comm_ssl_shake_read,
 183                 /** ssl initial handshake wants to write */
 184                 comm_ssl_shake_write,
 185                 /** ssl_write wants to read */
 186                 comm_ssl_shake_hs_read,
 187                 /** ssl_read wants to write */
 188                 comm_ssl_shake_hs_write
 189         } ssl_shake_state;
 190
 191         /* -------- dnstap ------- */
 192         /** the dnstap environment */
 193         struct dt_env* dtenv;
 194
 195         /** is this a UDP, TCP-accept or TCP socket. */
 196         enum comm_point_type {
 197                 /** UDP socket - handle datagrams. */
 198                 comm_udp,
 199                 /** TCP accept socket - only creates handlers if readable. */
 200                 comm_tcp_accept,
 201                 /** TCP handler socket - handle byteperbyte readwrite. */
 202                 comm_tcp,
 203                 /** AF_UNIX socket - for internal commands. */
 204                 comm_local,
 205                 /** raw - not DNS format - for pipe readers and writers */
 206                 comm_raw
 207         }
 208                 /** variable with type of socket, UDP,TCP-accept,TCP,pipe */
 209                 type;
 210
 211         /* ---------- Behaviour ----------- */
 212         /** if set the connection is NOT closed on delete. */
 213         int do_not_close;
 214
 215         /** if set, the connection is closed on error, on timeout,
 216             and after read/write completes. No callback is done. */
 217         int tcp_do_close;
 218
 219         /** if set, read/write completes:
 220                 read/write state of tcp is toggled.
 221                 buffer reset/bytecount reset.
 222                 this flag cleared.
 223             So that when that is done the callback is called. */
 224         int tcp_do_toggle_rw;
 225
 226         /** if set, checks for pending error from nonblocking connect() call.*/
 227         int tcp_check_nb_connect;
 228
 229         /** number of queries outstanding on this socket, used by
 230          * outside network for udp ports */
 231         int inuse;
 232
 233         /** callback when done.
 234             tcp_accept does not get called back, is NULL then.
 235             If a timeout happens, callback with timeout=1 is called.
 236             If an error happens, callback is called with error set
 237             nonzero. If not NETEVENT_NOERROR, it is an errno value.
 238             If the connection is closed (by remote end) then the
 239             callback is called with error set to NETEVENT_CLOSED=-1.
 240             If a timeout happens on the connection, the error is set to
 241             NETEVENT_TIMEOUT=-2.
 242             The reply_info can be copied if the reply needs to happen at a
 243             later time. It consists of a struct with commpoint and address.
 244             It can be passed to a msg send routine some time later.
 245             Note the reply information is temporary and must be copied.
 246             NULL is passed for_reply info, in cases where error happened.
 247
 248             declare as:
 249             int my_callback(struct comm_point* c, void* my_arg, int error,
 250                 struct comm_reply *reply_info);
 251
 252             if the routine returns 0, nothing is done.
 253             Notzero, the buffer will be sent back to client.
 254                         For UDP this is done without changing the commpoint.
 255                         In TCP it sets write state.
 256         */
 257         comm_point_callback_t* callback;
 258         /** argument to pass to callback. */
 259         void *cb_arg;
 260 };
 261
 262 /**
 263  * Structure only for making timeout events.
 264  */
 265 struct comm_timer {
 266         /** the internal event stuff */
 267         struct internal_timer* ev_timer;
 268
 269         /** callback function, takes user arg only */
 270         void (*callback)(void*);
 271
 272         /** callback user argument */
 273         void* cb_arg;
 274 };
 275
 276 /**
 277  * Structure only for signal events.
 278  */
 279 struct comm_signal {
 280         /** the communication base */
 281         struct comm_base* base;
 282
 283         /** the internal event stuff */
 284         struct internal_signal* ev_signal;
 285
 286         /** callback function, takes signal number and user arg */
 287         void (*callback)(int, void*);
 288
 289         /** callback user argument */
 290         void* cb_arg;
 291 };
 292
 293 /**
 294  * Create a new comm base.
 295  * @param sigs: if true it attempts to create a default loop for
 296  *   signal handling.
 297  * @return: the new comm base. NULL on error.
 298  */
 299 struct comm_base* comm_base_create(int sigs);
 300
 301 /**
 302  * Create comm base that uses the given event_base (underlying event
 303  * mechanism pointer).
 304  * @param base: underlying lib event base.
 305  * @return: the new comm base. NULL on error.
 306  */
 307 struct comm_base* comm_base_create_event(struct event_base* base);
 308
 309 /**
 310  * Delete comm base structure but not the underlying lib event base.
 311  * All comm points must have been deleted.
 312  * @param b: the base to delete.
 313  */
 314 void comm_base_delete_no_base(struct comm_base* b);
 315
 316 /**
 317  * Destroy a comm base.
 318  * All comm points must have been deleted.
 319  * @param b: the base to delete.
 320  */
 321 void comm_base_delete(struct comm_base* b);
 322
 323 /**
 324  * Obtain two pointers. The pointers never change (until base_delete()).
 325  * The pointers point to time values that are updated regularly.
 326  * @param b: the communication base that will update the time values.
 327  * @param tt: pointer to time in seconds is returned.
 328  * @param tv: pointer to time in microseconds is returned.
 329  */
 330 void comm_base_timept(struct comm_base* b, time_t** tt, struct timeval** tv);
 331
 332 /**
 333  * Dispatch the comm base events.
 334  * @param b: the communication to perform.
 335  */
 336 void comm_base_dispatch(struct comm_base* b);
 337
 338 /**
 339  * Exit from dispatch loop.
 340  * @param b: the communication base that is in dispatch().
 341  */
 342 void comm_base_exit(struct comm_base* b);
 343
 344 /**
 345  * Set the slow_accept mode handlers.  You can not provide these if you do
 346  * not perform accept() calls.
 347  * @param b: comm base
 348  * @param stop_accept: function that stops listening to accept fds.
 349  * @param start_accept: function that resumes listening to accept fds.
 350  * @param arg: callback arg to pass to the functions.
 351  */
 352 void comm_base_set_slow_accept_handlers(struct comm_base* b,
 353         void (*stop_accept)(void*), void (*start_accept)(void*), void* arg);
 354
 355 /**
 356  * Access internal data structure (for util/tube.c on windows)
 357  * @param b: comm base
 358  * @return event_base. Could be libevent, or internal event handler.
 359  */
 360 struct event_base* comm_base_internal(struct comm_base* b);
 361
 362 /**
 363  * Create an UDP comm point. Calls malloc.
 364  * setups the structure with the parameters you provide.
 365  * @param base: in which base to alloc the commpoint.
 366  * @param fd : file descriptor of open UDP socket.
 367  * @param buffer: shared buffer by UDP sockets from this thread.
 368  * @param callback: callback function pointer.
 369  * @param callback_arg: will be passed to your callback function.
 370  * @return: returns the allocated communication point. NULL on error.
 371  * Sets timeout to NULL. Turns off TCP options.
 372  */
 373 struct comm_point* comm_point_create_udp(struct comm_base* base,
 374         int fd, struct sldns_buffer* buffer,
 375         comm_point_callback_t* callback, void* callback_arg);
 376
 377 /**
 378  * Create an UDP with ancillary data comm point. Calls malloc.
 379  * Uses recvmsg instead of recv to get udp message.
 380  * setups the structure with the parameters you provide.
 381  * @param base: in which base to alloc the commpoint.
 382  * @param fd : file descriptor of open UDP socket.
 383  * @param buffer: shared buffer by UDP sockets from this thread.
 384  * @param callback: callback function pointer.
 385  * @param callback_arg: will be passed to your callback function.
 386  * @return: returns the allocated communication point. NULL on error.
 387  * Sets timeout to NULL. Turns off TCP options.
 388  */
 389 struct comm_point* comm_point_create_udp_ancil(struct comm_base* base,
 390         int fd, struct sldns_buffer* buffer,
 391         comm_point_callback_t* callback, void* callback_arg);
 392
 393 /**
 394  * Create a TCP listener comm point. Calls malloc.
 395  * Setups the structure with the parameters you provide.
 396  * Also Creates TCP Handlers, pre allocated for you.
 397  * Uses the parameters you provide.
 398  * @param base: in which base to alloc the commpoint.
 399  * @param fd: file descriptor of open TCP socket set to listen nonblocking.
 400  * @param num: becomes max_tcp_count, the routine allocates that
 401  *      many tcp handler commpoints.
 402  * @param bufsize: size of buffer to create for handlers.
 403  * @param callback: callback function pointer for TCP handlers.
 404  * @param callback_arg: will be passed to your callback function.
 405  * @return: returns the TCP listener commpoint. You can find the
 406  *      TCP handlers in the array inside the listener commpoint.
 407  *      returns NULL on error.
 408  * Inits timeout to NULL. All handlers are on the free list.
 409  */
 410 struct comm_point* comm_point_create_tcp(struct comm_base* base,
 411         int fd, int num, size_t bufsize,
 412         comm_point_callback_t* callback, void* callback_arg);
 413
 414 /**
 415  * Create an outgoing TCP commpoint. No file descriptor is opened, left at -1.
 416  * @param base: in which base to alloc the commpoint.
 417  * @param bufsize: size of buffer to create for handlers.
 418  * @param callback: callback function pointer for the handler.
 419  * @param callback_arg: will be passed to your callback function.
 420  * @return: the commpoint or NULL on error.
 421  */
 422 struct comm_point* comm_point_create_tcp_out(struct comm_base* base,
 423         size_t bufsize, comm_point_callback_t* callback, void* callback_arg);
 424
 425 /**
 426  * Create commpoint to listen to a local domain file descriptor.
 427  * @param base: in which base to alloc the commpoint.
 428  * @param fd: file descriptor of open AF_UNIX socket set to listen nonblocking.
 429  * @param bufsize: size of buffer to create for handlers.
 430  * @param callback: callback function pointer for the handler.
 431  * @param callback_arg: will be passed to your callback function.
 432  * @return: the commpoint or NULL on error.
 433  */
 434 struct comm_point* comm_point_create_local(struct comm_base* base,
 435         int fd, size_t bufsize,
 436         comm_point_callback_t* callback, void* callback_arg);
 437
 438 /**
 439  * Create commpoint to listen to a local domain pipe descriptor.
 440  * @param base: in which base to alloc the commpoint.
 441  * @param fd: file descriptor.
 442  * @param writing: true if you want to listen to writes, false for reads.
 443  * @param callback: callback function pointer for the handler.
 444  * @param callback_arg: will be passed to your callback function.
 445  * @return: the commpoint or NULL on error.
 446  */
 447 struct comm_point* comm_point_create_raw(struct comm_base* base,
 448         int fd, int writing,
 449         comm_point_callback_t* callback, void* callback_arg);
 450
 451 /**
 452  * Close a comm point fd.
 453  * @param c: comm point to close.
 454  */
 455 void comm_point_close(struct comm_point* c);
 456
 457 /**
 458  * Close and deallocate (free) the comm point. If the comm point is
 459  * a tcp-accept point, also its tcp-handler points are deleted.
 460  * @param c: comm point to delete.
 461  */
 462 void comm_point_delete(struct comm_point* c);
 463
 464 /**
 465  * Send reply. Put message into commpoint buffer.
 466  * @param repinfo: The reply info copied from a commpoint callback call.
 467  */
 468 void comm_point_send_reply(struct comm_reply* repinfo);
 469
 470 /**
 471  * Drop reply. Cleans up.
 472  * @param repinfo: The reply info copied from a commpoint callback call.
 473  */
 474 void comm_point_drop_reply(struct comm_reply* repinfo);
 475
 476 /**
 477  * Send an udp message over a commpoint.
 478  * @param c: commpoint to send it from.
 479  * @param packet: what to send.
 480  * @param addr: where to send it to.
 481  * @param addrlen: length of addr.
 482  * @return: false on a failure.
 483  */
 484 int comm_point_send_udp_msg(struct comm_point* c, struct sldns_buffer* packet,
 485         struct sockaddr* addr, socklen_t addrlen);
 486
 487 /**
 488  * Stop listening for input on the commpoint. No callbacks will happen.
 489  * @param c: commpoint to disable. The fd is not closed.
 490  */
 491 void comm_point_stop_listening(struct comm_point* c);
 492
 493 /**
 494  * Start listening again for input on the comm point.
 495  * @param c: commpoint to enable again.
 496  * @param newfd: new fd, or -1 to leave fd be.
 497  * @param sec: timeout in seconds, or -1 for no (change to the) timeout.
 498  */
 499 void comm_point_start_listening(struct comm_point* c, int newfd, int sec);
 500
 501 /**
 502  * Stop listening and start listening again for reading or writing.
 503  * @param c: commpoint
 504  * @param rd: if true, listens for reading.
 505  * @param wr: if true, listens for writing.
 506  */
 507 void comm_point_listen_for_rw(struct comm_point* c, int rd, int wr);
 508
 509 /**
 510  * Get size of memory used by comm point.
 511  * For TCP handlers this includes subhandlers.
 512  * For UDP handlers, this does not include the (shared) UDP buffer.
 513  * @param c: commpoint.
 514  * @return size in bytes.
 515  */
 516 size_t comm_point_get_mem(struct comm_point* c);
 517
 518 /**
 519  * create timer. Not active upon creation.
 520  * @param base: event handling base.
 521  * @param cb: callback function: void myfunc(void* myarg);
 522  * @param cb_arg: user callback argument.
 523  * @return: the new timer or NULL on error.
 524  */
 525 struct comm_timer* comm_timer_create(struct comm_base* base,
 526         void (*cb)(void*), void* cb_arg);
 527
 528 /**
 529  * disable timer. Stops callbacks from happening.
 530  * @param timer: to disable.
 531  */
 532 void comm_timer_disable(struct comm_timer* timer);
 533
 534 /**
 535  * reset timevalue for timer.
 536  * @param timer: timer to (re)set.
 537  * @param tv: when the timer should activate. if NULL timer is disabled.
 538  */
 539 void comm_timer_set(struct comm_timer* timer, struct timeval* tv);
 540
 541 /**
 542  * delete timer.
 543  * @param timer: to delete.
 544  */
 545 void comm_timer_delete(struct comm_timer* timer);
 546
 547 /**
 548  * see if timeout has been set to a value.
 549  * @param timer: the timer to examine.
 550  * @return: false if disabled or not set.
 551  */
 552 int comm_timer_is_set(struct comm_timer* timer);
 553
 554 /**
 555  * Get size of memory used by comm timer.
 556  * @param timer: the timer to examine.
 557  * @return size in bytes.
 558  */
 559 size_t comm_timer_get_mem(struct comm_timer* timer);
 560
 561 /**
 562  * Create a signal handler. Call signal_bind() later to bind to a signal.
 563  * @param base: communication base to use.
 564  * @param callback: called when signal is caught.
 565  * @param cb_arg: user argument to callback
 566  * @return: the signal struct or NULL on error.
 567  */
 568 struct comm_signal* comm_signal_create(struct comm_base* base,
 569         void (*callback)(int, void*), void* cb_arg);
 570
 571 /**
 572  * Bind signal struct to catch a signal. A signle comm_signal can be bound
 573  * to multiple signals, calling comm_signal_bind multiple times.
 574  * @param comsig: the communication point, with callback information.
 575  * @param sig: signal number.
 576  * @return: true on success. false on error.
 577  */
 578 int comm_signal_bind(struct comm_signal* comsig, int sig);
 579
 580 /**
 581  * Delete the signal communication point.
 582  * @param comsig: to delete.
 583  */
 584 void comm_signal_delete(struct comm_signal* comsig);
 585
 586 /**
 587  * perform accept(2) with error checking.
 588  * @param c: commpoint with accept fd.
 589  * @param addr: remote end returned here.
 590  * @param addrlen: length of remote end returned here.
 591  * @return new fd, or -1 on error.
 592  *      if -1, error message has been printed if necessary, simply drop
 593  *      out of the reading handler.
 594  */
 595 int comm_point_perform_accept(struct comm_point* c,
 596         struct sockaddr_storage* addr, socklen_t* addrlen);
 597
 598 /**** internal routines ****/
 599
 600 /**
 601  * This routine is published for checks and tests, and is only used internally.
 602  * handle libevent callback for udp comm point.
 603  * @param fd: file descriptor.
 604  * @param event: event bits from libevent:
 605  *      EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
 606  * @param arg: the comm_point structure.
 607  */
 608 void comm_point_udp_callback(int fd, short event, void* arg);
 609
 610 /**
 611  * This routine is published for checks and tests, and is only used internally.
 612  * handle libevent callback for udp ancillary data comm point.
 613  * @param fd: file descriptor.
 614  * @param event: event bits from libevent:
 615  *      EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
 616  * @param arg: the comm_point structure.
 617  */
 618 void comm_point_udp_ancil_callback(int fd, short event, void* arg);
 619
 620 /**
 621  * This routine is published for checks and tests, and is only used internally.
 622  * handle libevent callback for tcp accept comm point
 623  * @param fd: file descriptor.
 624  * @param event: event bits from libevent:
 625  *      EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
 626  * @param arg: the comm_point structure.
 627  */
 628 void comm_point_tcp_accept_callback(int fd, short event, void* arg);
 629
 630 /**
 631  * This routine is published for checks and tests, and is only used internally.
 632  * handle libevent callback for tcp data comm point
 633  * @param fd: file descriptor.
 634  * @param event: event bits from libevent:
 635  *      EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
 636  * @param arg: the comm_point structure.
 637  */
 638 void comm_point_tcp_handle_callback(int fd, short event, void* arg);
 639
 640 /**
 641  * This routine is published for checks and tests, and is only used internally.
 642  * handle libevent callback for timer comm.
 643  * @param fd: file descriptor (always -1).
 644  * @param event: event bits from libevent:
 645  *      EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
 646  * @param arg: the comm_timer structure.
 647  */
 648 void comm_timer_callback(int fd, short event, void* arg);
 649
 650 /**
 651  * This routine is published for checks and tests, and is only used internally.
 652  * handle libevent callback for signal comm.
 653  * @param fd: file descriptor (used for the signal number).
 654  * @param event: event bits from libevent:
 655  *      EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
 656  * @param arg: the internal commsignal structure.
 657  */
 658 void comm_signal_callback(int fd, short event, void* arg);
 659
 660 /**
 661  * This routine is published for checks and tests, and is only used internally.
 662  * libevent callback for AF_UNIX fds
 663  * @param fd: file descriptor.
 664  * @param event: event bits from libevent:
 665  *      EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
 666  * @param arg: the comm_point structure.
 667  */
 668 void comm_point_local_handle_callback(int fd, short event, void* arg);
 669
 670 /**
 671  * This routine is published for checks and tests, and is only used internally.
 672  * libevent callback for raw fd access.
 673  * @param fd: file descriptor.
 674  * @param event: event bits from libevent:
 675  *      EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
 676  * @param arg: the comm_point structure.
 677  */
 678 void comm_point_raw_handle_callback(int fd, short event, void* arg);
 679
 680 /**
 681  * This routine is published for checks and tests, and is only used internally.
 682  * libevent callback for timeout on slow accept.
 683  * @param fd: file descriptor.
 684  * @param event: event bits from libevent:
 685  *      EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
 686  * @param arg: the comm_point structure.
 687  */
 688 void comm_base_handle_slow_accept(int fd, short event, void* arg);
 689
 690 #ifdef USE_WINSOCK
 691 /**
 692  * Callback for openssl BIO to on windows detect WSAEWOULDBLOCK and notify
 693  * the winsock_event of this for proper TCP nonblocking implementation.
 694  * @param c: comm_point, fd must be set its struct event is registered.
 695  * @param ssl: openssl SSL, fd must be set so it has a bio.
 696  */
 697 void comm_point_tcp_win_bio_cb(struct comm_point* c, void* ssl);
 698 #endif
 699
 700 /** see if errno for tcp connect has to be logged or not. This uses errno */
 701 int tcp_connect_errno_needs_log(struct sockaddr* addr, socklen_t addrlen);
 702
 703 #endif /* NET_EVENT_H */