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706 lines
24 KiB
C
706 lines
24 KiB
C
/*
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* util/netevent.h - event notification
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains event notification functions.
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*
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* There are three types of communication points
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* o UDP socket - perthread buffer.
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* o TCP-accept socket - array of TCP-sockets, socketcount.
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* o TCP socket - own buffer, parent-TCPaccept, read/write state,
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* number of bytes read/written, timeout.
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*
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* There are sockets aimed towards our clients and towards the internet.
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* o frontside - aimed towards our clients, queries come in, answers back.
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* o behind - aimed towards internet, to the authoritative DNS servers.
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*
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* Several event types are available:
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* o comm_base - for thread safety of the comm points, one per thread.
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* o comm_point - udp and tcp networking, with callbacks.
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* o comm_timer - a timeout with callback.
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* o comm_signal - callbacks when signal is caught.
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* o comm_reply - holds reply info during networking callback.
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*
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*/
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#ifndef NET_EVENT_H
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#define NET_EVENT_H
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struct sldns_buffer;
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struct comm_point;
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struct comm_reply;
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struct event_base;
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/* internal event notification data storage structure. */
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struct internal_event;
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struct internal_base;
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struct internal_timer;
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/** callback from communication point function type */
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typedef int comm_point_callback_t(struct comm_point*, void*, int,
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struct comm_reply*);
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/** to pass no_error to callback function */
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#define NETEVENT_NOERROR 0
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/** to pass closed connection to callback function */
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#define NETEVENT_CLOSED -1
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/** to pass timeout happened to callback function */
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#define NETEVENT_TIMEOUT -2
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/** to pass fallback from capsforID to callback function; 0x20 failed */
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#define NETEVENT_CAPSFAIL -3
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/** timeout to slow accept calls when not possible, in msec. */
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#define NETEVENT_SLOW_ACCEPT_TIME 2000
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/**
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* A communication point dispatcher. Thread specific.
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*/
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struct comm_base {
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/** behind the scenes structure. with say libevent info. alloced */
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struct internal_base* eb;
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/** callback to stop listening on accept sockets,
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* performed when accept() will not function properly */
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void (*stop_accept)(void*);
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/** callback to start listening on accept sockets, performed
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* after stop_accept() then a timeout has passed. */
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void (*start_accept)(void*);
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/** user argument for stop_accept and start_accept functions */
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void* cb_arg;
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};
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/**
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* Reply information for a communication point.
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*/
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struct comm_reply {
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/** the comm_point with fd to send reply on to. */
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struct comm_point* c;
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/** the address (for UDP based communication) */
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struct sockaddr_storage addr;
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/** length of address */
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socklen_t addrlen;
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/** return type 0 (none), 4(IP4), 6(IP6) */
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int srctype;
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/** the return source interface data */
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union {
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#ifdef IPV6_PKTINFO
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struct in6_pktinfo v6info;
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#endif
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#ifdef IP_PKTINFO
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struct in_pktinfo v4info;
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#elif defined(IP_RECVDSTADDR)
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struct in_addr v4addr;
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#endif
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}
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/** variable with return source data */
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pktinfo;
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};
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/**
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* Communication point to the network
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* These behaviours can be accomplished by setting the flags
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* and passing return values from the callback.
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* udp frontside: called after readdone. sendafter.
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* tcp frontside: called readdone, sendafter. close.
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* udp behind: called after readdone. No send after.
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* tcp behind: write done, read done, then called. No send after.
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*/
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struct comm_point {
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/** behind the scenes structure, with say libevent info. alloced. */
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struct internal_event* ev;
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/** file descriptor for communication point */
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int fd;
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/** timeout (NULL if it does not). Malloced. */
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struct timeval* timeout;
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/** buffer pointer. Either to perthread, or own buffer or NULL */
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struct sldns_buffer* buffer;
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/* -------- TCP Handler -------- */
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/** Read/Write state for TCP */
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int tcp_is_reading;
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/** The current read/write count for TCP */
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size_t tcp_byte_count;
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/** parent communication point (for TCP sockets) */
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struct comm_point* tcp_parent;
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/** sockaddr from peer, for TCP handlers */
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struct comm_reply repinfo;
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/* -------- TCP Accept -------- */
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/** the number of TCP handlers for this tcp-accept socket */
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int max_tcp_count;
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/** current number of tcp handler in-use for this accept socket */
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int cur_tcp_count;
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/** malloced array of tcp handlers for a tcp-accept,
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of size max_tcp_count. */
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struct comm_point** tcp_handlers;
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/** linked list of free tcp_handlers to use for new queries.
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For tcp_accept the first entry, for tcp_handlers the next one. */
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struct comm_point* tcp_free;
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/* -------- SSL TCP DNS ------- */
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/** the SSL object with rw bio (owned) or for commaccept ctx ref */
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void* ssl;
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/** handshake state for init and renegotiate */
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enum {
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/** no handshake, it has been done */
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comm_ssl_shake_none = 0,
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/** ssl initial handshake wants to read */
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comm_ssl_shake_read,
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/** ssl initial handshake wants to write */
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comm_ssl_shake_write,
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/** ssl_write wants to read */
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comm_ssl_shake_hs_read,
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/** ssl_read wants to write */
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comm_ssl_shake_hs_write
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} ssl_shake_state;
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/* -------- dnstap ------- */
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/** the dnstap environment */
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struct dt_env* dtenv;
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/** is this a UDP, TCP-accept or TCP socket. */
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enum comm_point_type {
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/** UDP socket - handle datagrams. */
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comm_udp,
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/** TCP accept socket - only creates handlers if readable. */
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comm_tcp_accept,
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/** TCP handler socket - handle byteperbyte readwrite. */
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comm_tcp,
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/** AF_UNIX socket - for internal commands. */
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comm_local,
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/** raw - not DNS format - for pipe readers and writers */
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comm_raw
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}
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/** variable with type of socket, UDP,TCP-accept,TCP,pipe */
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type;
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/* ---------- Behaviour ----------- */
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/** if set the connection is NOT closed on delete. */
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int do_not_close;
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/** if set, the connection is closed on error, on timeout,
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and after read/write completes. No callback is done. */
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int tcp_do_close;
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/** if set, read/write completes:
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read/write state of tcp is toggled.
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buffer reset/bytecount reset.
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this flag cleared.
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So that when that is done the callback is called. */
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int tcp_do_toggle_rw;
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/** if set, checks for pending error from nonblocking connect() call.*/
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int tcp_check_nb_connect;
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/** number of queries outstanding on this socket, used by
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* outside network for udp ports */
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int inuse;
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/** callback when done.
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tcp_accept does not get called back, is NULL then.
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If a timeout happens, callback with timeout=1 is called.
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If an error happens, callback is called with error set
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nonzero. If not NETEVENT_NOERROR, it is an errno value.
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If the connection is closed (by remote end) then the
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callback is called with error set to NETEVENT_CLOSED=-1.
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If a timeout happens on the connection, the error is set to
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NETEVENT_TIMEOUT=-2.
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The reply_info can be copied if the reply needs to happen at a
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later time. It consists of a struct with commpoint and address.
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It can be passed to a msg send routine some time later.
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Note the reply information is temporary and must be copied.
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NULL is passed for_reply info, in cases where error happened.
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declare as:
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int my_callback(struct comm_point* c, void* my_arg, int error,
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struct comm_reply *reply_info);
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if the routine returns 0, nothing is done.
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Notzero, the buffer will be sent back to client.
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For UDP this is done without changing the commpoint.
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In TCP it sets write state.
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*/
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comm_point_callback_t* callback;
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/** argument to pass to callback. */
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void *cb_arg;
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};
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/**
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* Structure only for making timeout events.
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*/
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struct comm_timer {
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/** the internal event stuff */
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struct internal_timer* ev_timer;
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/** callback function, takes user arg only */
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void (*callback)(void*);
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/** callback user argument */
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void* cb_arg;
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};
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/**
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* Structure only for signal events.
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*/
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struct comm_signal {
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/** the communication base */
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struct comm_base* base;
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/** the internal event stuff */
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struct internal_signal* ev_signal;
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/** callback function, takes signal number and user arg */
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void (*callback)(int, void*);
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/** callback user argument */
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void* cb_arg;
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};
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/**
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* Create a new comm base.
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* @param sigs: if true it attempts to create a default loop for
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* signal handling.
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* @return: the new comm base. NULL on error.
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*/
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struct comm_base* comm_base_create(int sigs);
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/**
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* Create comm base that uses the given event_base (underlying event
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* mechanism pointer).
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* @param base: underlying lib event base.
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* @return: the new comm base. NULL on error.
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*/
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struct comm_base* comm_base_create_event(struct event_base* base);
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/**
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* Delete comm base structure but not the underlying lib event base.
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* All comm points must have been deleted.
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* @param b: the base to delete.
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*/
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void comm_base_delete_no_base(struct comm_base* b);
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/**
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* Destroy a comm base.
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* All comm points must have been deleted.
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* @param b: the base to delete.
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*/
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void comm_base_delete(struct comm_base* b);
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/**
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* Obtain two pointers. The pointers never change (until base_delete()).
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* The pointers point to time values that are updated regularly.
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* @param b: the communication base that will update the time values.
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* @param tt: pointer to time in seconds is returned.
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* @param tv: pointer to time in microseconds is returned.
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*/
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void comm_base_timept(struct comm_base* b, time_t** tt, struct timeval** tv);
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/**
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* Dispatch the comm base events.
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* @param b: the communication to perform.
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*/
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void comm_base_dispatch(struct comm_base* b);
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/**
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* Exit from dispatch loop.
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* @param b: the communication base that is in dispatch().
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*/
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void comm_base_exit(struct comm_base* b);
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/**
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* Set the slow_accept mode handlers. You can not provide these if you do
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* not perform accept() calls.
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* @param b: comm base
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* @param stop_accept: function that stops listening to accept fds.
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* @param start_accept: function that resumes listening to accept fds.
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* @param arg: callback arg to pass to the functions.
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*/
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void comm_base_set_slow_accept_handlers(struct comm_base* b,
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void (*stop_accept)(void*), void (*start_accept)(void*), void* arg);
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/**
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* Access internal data structure (for util/tube.c on windows)
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* @param b: comm base
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* @return event_base. Could be libevent, or internal event handler.
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*/
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struct event_base* comm_base_internal(struct comm_base* b);
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/**
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* Create an UDP comm point. Calls malloc.
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* setups the structure with the parameters you provide.
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* @param base: in which base to alloc the commpoint.
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* @param fd : file descriptor of open UDP socket.
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* @param buffer: shared buffer by UDP sockets from this thread.
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* @param callback: callback function pointer.
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* @param callback_arg: will be passed to your callback function.
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* @return: returns the allocated communication point. NULL on error.
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* Sets timeout to NULL. Turns off TCP options.
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*/
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struct comm_point* comm_point_create_udp(struct comm_base* base,
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int fd, struct sldns_buffer* buffer,
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comm_point_callback_t* callback, void* callback_arg);
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/**
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* Create an UDP with ancillary data comm point. Calls malloc.
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* Uses recvmsg instead of recv to get udp message.
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* setups the structure with the parameters you provide.
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* @param base: in which base to alloc the commpoint.
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* @param fd : file descriptor of open UDP socket.
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* @param buffer: shared buffer by UDP sockets from this thread.
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* @param callback: callback function pointer.
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* @param callback_arg: will be passed to your callback function.
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* @return: returns the allocated communication point. NULL on error.
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* Sets timeout to NULL. Turns off TCP options.
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*/
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struct comm_point* comm_point_create_udp_ancil(struct comm_base* base,
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int fd, struct sldns_buffer* buffer,
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comm_point_callback_t* callback, void* callback_arg);
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/**
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* Create a TCP listener comm point. Calls malloc.
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* Setups the structure with the parameters you provide.
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* Also Creates TCP Handlers, pre allocated for you.
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* Uses the parameters you provide.
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* @param base: in which base to alloc the commpoint.
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* @param fd: file descriptor of open TCP socket set to listen nonblocking.
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* @param num: becomes max_tcp_count, the routine allocates that
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* many tcp handler commpoints.
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* @param bufsize: size of buffer to create for handlers.
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* @param callback: callback function pointer for TCP handlers.
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* @param callback_arg: will be passed to your callback function.
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* @return: returns the TCP listener commpoint. You can find the
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* TCP handlers in the array inside the listener commpoint.
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* returns NULL on error.
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* Inits timeout to NULL. All handlers are on the free list.
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*/
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struct comm_point* comm_point_create_tcp(struct comm_base* base,
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int fd, int num, size_t bufsize,
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comm_point_callback_t* callback, void* callback_arg);
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/**
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* Create an outgoing TCP commpoint. No file descriptor is opened, left at -1.
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* @param base: in which base to alloc the commpoint.
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* @param bufsize: size of buffer to create for handlers.
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* @param callback: callback function pointer for the handler.
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* @param callback_arg: will be passed to your callback function.
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* @return: the commpoint or NULL on error.
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*/
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struct comm_point* comm_point_create_tcp_out(struct comm_base* base,
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size_t bufsize, comm_point_callback_t* callback, void* callback_arg);
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/**
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* Create commpoint to listen to a local domain file descriptor.
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* @param base: in which base to alloc the commpoint.
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* @param fd: file descriptor of open AF_UNIX socket set to listen nonblocking.
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* @param bufsize: size of buffer to create for handlers.
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* @param callback: callback function pointer for the handler.
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* @param callback_arg: will be passed to your callback function.
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* @return: the commpoint or NULL on error.
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*/
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struct comm_point* comm_point_create_local(struct comm_base* base,
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int fd, size_t bufsize,
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comm_point_callback_t* callback, void* callback_arg);
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/**
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* Create commpoint to listen to a local domain pipe descriptor.
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* @param base: in which base to alloc the commpoint.
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* @param fd: file descriptor.
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* @param writing: true if you want to listen to writes, false for reads.
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* @param callback: callback function pointer for the handler.
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* @param callback_arg: will be passed to your callback function.
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* @return: the commpoint or NULL on error.
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*/
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struct comm_point* comm_point_create_raw(struct comm_base* base,
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int fd, int writing,
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comm_point_callback_t* callback, void* callback_arg);
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/**
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* Close a comm point fd.
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* @param c: comm point to close.
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*/
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void comm_point_close(struct comm_point* c);
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/**
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* Close and deallocate (free) the comm point. If the comm point is
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* a tcp-accept point, also its tcp-handler points are deleted.
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* @param c: comm point to delete.
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*/
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void comm_point_delete(struct comm_point* c);
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/**
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* Send reply. Put message into commpoint buffer.
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* @param repinfo: The reply info copied from a commpoint callback call.
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*/
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void comm_point_send_reply(struct comm_reply* repinfo);
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/**
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* Drop reply. Cleans up.
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* @param repinfo: The reply info copied from a commpoint callback call.
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*/
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void comm_point_drop_reply(struct comm_reply* repinfo);
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/**
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* Send an udp message over a commpoint.
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* @param c: commpoint to send it from.
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* @param packet: what to send.
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* @param addr: where to send it to.
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* @param addrlen: length of addr.
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* @return: false on a failure.
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*/
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int comm_point_send_udp_msg(struct comm_point* c, struct sldns_buffer* packet,
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struct sockaddr* addr, socklen_t addrlen);
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/**
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* Stop listening for input on the commpoint. No callbacks will happen.
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* @param c: commpoint to disable. The fd is not closed.
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*/
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void comm_point_stop_listening(struct comm_point* c);
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/**
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* Start listening again for input on the comm point.
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* @param c: commpoint to enable again.
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* @param newfd: new fd, or -1 to leave fd be.
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* @param sec: timeout in seconds, or -1 for no (change to the) timeout.
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*/
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void comm_point_start_listening(struct comm_point* c, int newfd, int sec);
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/**
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* Stop listening and start listening again for reading or writing.
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* @param c: commpoint
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* @param rd: if true, listens for reading.
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* @param wr: if true, listens for writing.
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*/
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void comm_point_listen_for_rw(struct comm_point* c, int rd, int wr);
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/**
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* Get size of memory used by comm point.
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* For TCP handlers this includes subhandlers.
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* For UDP handlers, this does not include the (shared) UDP buffer.
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* @param c: commpoint.
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* @return size in bytes.
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*/
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size_t comm_point_get_mem(struct comm_point* c);
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/**
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* create timer. Not active upon creation.
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* @param base: event handling base.
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* @param cb: callback function: void myfunc(void* myarg);
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* @param cb_arg: user callback argument.
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* @return: the new timer or NULL on error.
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*/
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struct comm_timer* comm_timer_create(struct comm_base* base,
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void (*cb)(void*), void* cb_arg);
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/**
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* disable timer. Stops callbacks from happening.
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* @param timer: to disable.
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*/
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void comm_timer_disable(struct comm_timer* timer);
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/**
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* reset timevalue for timer.
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* @param timer: timer to (re)set.
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* @param tv: when the timer should activate. if NULL timer is disabled.
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*/
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void comm_timer_set(struct comm_timer* timer, struct timeval* tv);
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/**
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* delete timer.
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* @param timer: to delete.
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*/
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void comm_timer_delete(struct comm_timer* timer);
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/**
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* see if timeout has been set to a value.
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* @param timer: the timer to examine.
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* @return: false if disabled or not set.
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*/
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int comm_timer_is_set(struct comm_timer* timer);
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/**
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* Get size of memory used by comm timer.
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* @param timer: the timer to examine.
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* @return size in bytes.
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*/
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size_t comm_timer_get_mem(struct comm_timer* timer);
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/**
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* Create a signal handler. Call signal_bind() later to bind to a signal.
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* @param base: communication base to use.
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* @param callback: called when signal is caught.
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* @param cb_arg: user argument to callback
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* @return: the signal struct or NULL on error.
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*/
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struct comm_signal* comm_signal_create(struct comm_base* base,
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void (*callback)(int, void*), void* cb_arg);
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/**
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* Bind signal struct to catch a signal. A signle comm_signal can be bound
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* to multiple signals, calling comm_signal_bind multiple times.
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* @param comsig: the communication point, with callback information.
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* @param sig: signal number.
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* @return: true on success. false on error.
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*/
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int comm_signal_bind(struct comm_signal* comsig, int sig);
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/**
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* Delete the signal communication point.
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* @param comsig: to delete.
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*/
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void comm_signal_delete(struct comm_signal* comsig);
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/**
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* perform accept(2) with error checking.
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* @param c: commpoint with accept fd.
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* @param addr: remote end returned here.
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* @param addrlen: length of remote end returned here.
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* @return new fd, or -1 on error.
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* if -1, error message has been printed if necessary, simply drop
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* out of the reading handler.
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*/
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int comm_point_perform_accept(struct comm_point* c,
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struct sockaddr_storage* addr, socklen_t* addrlen);
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/**** internal routines ****/
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/**
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* This routine is published for checks and tests, and is only used internally.
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* handle libevent callback for udp comm point.
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* @param fd: file descriptor.
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* @param event: event bits from libevent:
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* EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
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* @param arg: the comm_point structure.
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*/
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void comm_point_udp_callback(int fd, short event, void* arg);
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/**
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* This routine is published for checks and tests, and is only used internally.
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* handle libevent callback for udp ancillary data comm point.
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* @param fd: file descriptor.
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* @param event: event bits from libevent:
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* EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
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* @param arg: the comm_point structure.
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*/
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void comm_point_udp_ancil_callback(int fd, short event, void* arg);
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/**
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* This routine is published for checks and tests, and is only used internally.
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* handle libevent callback for tcp accept comm point
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* @param fd: file descriptor.
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* @param event: event bits from libevent:
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* EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
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* @param arg: the comm_point structure.
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*/
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void comm_point_tcp_accept_callback(int fd, short event, void* arg);
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/**
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* This routine is published for checks and tests, and is only used internally.
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* handle libevent callback for tcp data comm point
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* @param fd: file descriptor.
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* @param event: event bits from libevent:
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* EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
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* @param arg: the comm_point structure.
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*/
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void comm_point_tcp_handle_callback(int fd, short event, void* arg);
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/**
|
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* This routine is published for checks and tests, and is only used internally.
|
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* handle libevent callback for timer comm.
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* @param fd: file descriptor (always -1).
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* @param event: event bits from libevent:
|
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* EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
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* @param arg: the comm_timer structure.
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*/
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void comm_timer_callback(int fd, short event, void* arg);
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|
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/**
|
|
* This routine is published for checks and tests, and is only used internally.
|
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* handle libevent callback for signal comm.
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* @param fd: file descriptor (used for the signal number).
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* @param event: event bits from libevent:
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* EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
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* @param arg: the internal commsignal structure.
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*/
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void comm_signal_callback(int fd, short event, void* arg);
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/**
|
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* This routine is published for checks and tests, and is only used internally.
|
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* libevent callback for AF_UNIX fds
|
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* @param fd: file descriptor.
|
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* @param event: event bits from libevent:
|
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* EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
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* @param arg: the comm_point structure.
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*/
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void comm_point_local_handle_callback(int fd, short event, void* arg);
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|
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/**
|
|
* This routine is published for checks and tests, and is only used internally.
|
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* libevent callback for raw fd access.
|
|
* @param fd: file descriptor.
|
|
* @param event: event bits from libevent:
|
|
* EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
|
|
* @param arg: the comm_point structure.
|
|
*/
|
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void comm_point_raw_handle_callback(int fd, short event, void* arg);
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|
|
/**
|
|
* This routine is published for checks and tests, and is only used internally.
|
|
* libevent callback for timeout on slow accept.
|
|
* @param fd: file descriptor.
|
|
* @param event: event bits from libevent:
|
|
* EV_READ, EV_WRITE, EV_SIGNAL, EV_TIMEOUT.
|
|
* @param arg: the comm_point structure.
|
|
*/
|
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void comm_base_handle_slow_accept(int fd, short event, void* arg);
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|
|
#ifdef USE_WINSOCK
|
|
/**
|
|
* Callback for openssl BIO to on windows detect WSAEWOULDBLOCK and notify
|
|
* the winsock_event of this for proper TCP nonblocking implementation.
|
|
* @param c: comm_point, fd must be set its struct event is registered.
|
|
* @param ssl: openssl SSL, fd must be set so it has a bio.
|
|
*/
|
|
void comm_point_tcp_win_bio_cb(struct comm_point* c, void* ssl);
|
|
#endif
|
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|
|
/** see if errno for tcp connect has to be logged or not. This uses errno */
|
|
int tcp_connect_errno_needs_log(struct sockaddr* addr, socklen_t addrlen);
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|
|
#endif /* NET_EVENT_H */
|