mirror of
https://git.wownero.com/wownero/wownero.git
synced 2024-08-15 01:03:23 +00:00
2218 lines
58 KiB
C
2218 lines
58 KiB
C
/*
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* util/netevent.c - 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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#include "config.h"
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#include "util/netevent.h"
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#include "util/log.h"
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#include "util/net_help.h"
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#include "util/fptr_wlist.h"
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#include "ldns/pkthdr.h"
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#include "ldns/sbuffer.h"
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#include "dnstap/dnstap.h"
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#ifdef HAVE_OPENSSL_SSL_H
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#include <openssl/ssl.h>
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#endif
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#ifdef HAVE_OPENSSL_ERR_H
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#include <openssl/err.h>
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#endif
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/* -------- Start of local definitions -------- */
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/** if CMSG_ALIGN is not defined on this platform, a workaround */
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#ifndef CMSG_ALIGN
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# ifdef _CMSG_DATA_ALIGN
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# define CMSG_ALIGN _CMSG_DATA_ALIGN
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# else
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# define CMSG_ALIGN(len) (((len)+sizeof(long)-1) & ~(sizeof(long)-1))
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# endif
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#endif
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/** if CMSG_LEN is not defined on this platform, a workaround */
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#ifndef CMSG_LEN
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# define CMSG_LEN(len) (CMSG_ALIGN(sizeof(struct cmsghdr))+(len))
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#endif
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/** if CMSG_SPACE is not defined on this platform, a workaround */
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#ifndef CMSG_SPACE
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# ifdef _CMSG_HDR_ALIGN
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# define CMSG_SPACE(l) (CMSG_ALIGN(l)+_CMSG_HDR_ALIGN(sizeof(struct cmsghdr)))
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# else
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# define CMSG_SPACE(l) (CMSG_ALIGN(l)+CMSG_ALIGN(sizeof(struct cmsghdr)))
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# endif
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#endif
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/** The TCP reading or writing query timeout in seconds */
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#define TCP_QUERY_TIMEOUT 120
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#ifndef NONBLOCKING_IS_BROKEN
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/** number of UDP reads to perform per read indication from select */
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#define NUM_UDP_PER_SELECT 100
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#else
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#define NUM_UDP_PER_SELECT 1
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#endif
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/* We define libevent structures here to hide the libevent stuff. */
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#ifdef USE_MINI_EVENT
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# ifdef USE_WINSOCK
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# include "util/winsock_event.h"
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# else
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# include "util/mini_event.h"
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# endif /* USE_WINSOCK */
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#else /* USE_MINI_EVENT */
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/* we use libevent */
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# ifdef HAVE_EVENT_H
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# include <event.h>
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# else
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# include "event2/event.h"
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# include "event2/event_struct.h"
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# include "event2/event_compat.h"
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# endif
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#endif /* USE_MINI_EVENT */
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/**
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* The internal event structure for keeping libevent info for the event.
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* Possibly other structures (list, tree) this is part of.
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*/
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struct internal_event {
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/** the comm base */
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struct comm_base* base;
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/** libevent event type, alloced here */
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struct event ev;
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};
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/**
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* Internal base structure, so that every thread has its own events.
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*/
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struct internal_base {
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/** libevent event_base type. */
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struct event_base* base;
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/** seconds time pointer points here */
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time_t secs;
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/** timeval with current time */
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struct timeval now;
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/** the event used for slow_accept timeouts */
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struct event slow_accept;
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/** true if slow_accept is enabled */
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int slow_accept_enabled;
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};
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/**
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* Internal timer structure, to store timer event in.
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*/
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struct internal_timer {
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/** the comm base */
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struct comm_base* base;
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/** libevent event type, alloced here */
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struct event ev;
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/** is timer enabled */
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uint8_t enabled;
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};
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/**
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* Internal signal structure, to store signal event in.
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*/
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struct internal_signal {
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/** libevent event type, alloced here */
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struct event ev;
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/** next in signal list */
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struct internal_signal* next;
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};
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/** create a tcp handler with a parent */
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static struct comm_point* comm_point_create_tcp_handler(
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struct comm_base *base, struct comm_point* parent, size_t bufsize,
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comm_point_callback_t* callback, void* callback_arg);
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/* -------- End of local definitions -------- */
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#ifdef USE_MINI_EVENT
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/** minievent updates the time when it blocks. */
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#define comm_base_now(x) /* nothing to do */
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#else /* !USE_MINI_EVENT */
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/** fillup the time values in the event base */
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static void
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comm_base_now(struct comm_base* b)
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{
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if(gettimeofday(&b->eb->now, NULL) < 0) {
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log_err("gettimeofday: %s", strerror(errno));
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}
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b->eb->secs = (time_t)b->eb->now.tv_sec;
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}
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#endif /* USE_MINI_EVENT */
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struct comm_base*
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comm_base_create(int sigs)
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{
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struct comm_base* b = (struct comm_base*)calloc(1,
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sizeof(struct comm_base));
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if(!b)
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return NULL;
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b->eb = (struct internal_base*)calloc(1, sizeof(struct internal_base));
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if(!b->eb) {
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free(b);
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return NULL;
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}
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#ifdef USE_MINI_EVENT
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(void)sigs;
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/* use mini event time-sharing feature */
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b->eb->base = event_init(&b->eb->secs, &b->eb->now);
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#else
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# if defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)
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/* libev */
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if(sigs)
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b->eb->base=(struct event_base *)ev_default_loop(EVFLAG_AUTO);
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else
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b->eb->base=(struct event_base *)ev_loop_new(EVFLAG_AUTO);
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# else
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(void)sigs;
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# ifdef HAVE_EVENT_BASE_NEW
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b->eb->base = event_base_new();
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# else
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b->eb->base = event_init();
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# endif
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# endif
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#endif
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if(!b->eb->base) {
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free(b->eb);
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free(b);
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return NULL;
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}
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comm_base_now(b);
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/* avoid event_get_method call which causes crashes even when
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* not printing, because its result is passed */
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verbose(VERB_ALGO,
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#if defined(HAVE_EV_LOOP) || defined(HAVE_EV_DEFAULT_LOOP)
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"libev"
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#elif defined(USE_MINI_EVENT)
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"event "
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#else
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"libevent "
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#endif
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"%s uses %s method.",
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event_get_version(),
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#ifdef HAVE_EVENT_BASE_GET_METHOD
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event_base_get_method(b->eb->base)
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#else
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"not_obtainable"
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#endif
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);
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return b;
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}
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struct comm_base*
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comm_base_create_event(struct event_base* base)
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{
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struct comm_base* b = (struct comm_base*)calloc(1,
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sizeof(struct comm_base));
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if(!b)
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return NULL;
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b->eb = (struct internal_base*)calloc(1, sizeof(struct internal_base));
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if(!b->eb) {
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free(b);
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return NULL;
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}
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b->eb->base = base;
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comm_base_now(b);
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return b;
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}
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void
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comm_base_delete(struct comm_base* b)
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{
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if(!b)
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return;
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if(b->eb->slow_accept_enabled) {
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if(event_del(&b->eb->slow_accept) != 0) {
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log_err("could not event_del slow_accept");
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}
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}
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#ifdef USE_MINI_EVENT
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event_base_free(b->eb->base);
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#elif defined(HAVE_EVENT_BASE_FREE) && defined(HAVE_EVENT_BASE_ONCE)
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/* only libevent 1.2+ has it, but in 1.2 it is broken -
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assertion fails on signal handling ev that is not deleted
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in libevent 1.3c (event_base_once appears) this is fixed. */
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event_base_free(b->eb->base);
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#endif /* HAVE_EVENT_BASE_FREE and HAVE_EVENT_BASE_ONCE */
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b->eb->base = NULL;
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free(b->eb);
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free(b);
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}
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void
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comm_base_delete_no_base(struct comm_base* b)
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{
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if(!b)
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return;
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if(b->eb->slow_accept_enabled) {
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if(event_del(&b->eb->slow_accept) != 0) {
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log_err("could not event_del slow_accept");
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}
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}
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b->eb->base = NULL;
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free(b->eb);
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free(b);
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}
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void
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comm_base_timept(struct comm_base* b, time_t** tt, struct timeval** tv)
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{
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*tt = &b->eb->secs;
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*tv = &b->eb->now;
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}
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void
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comm_base_dispatch(struct comm_base* b)
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{
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int retval;
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retval = event_base_dispatch(b->eb->base);
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if(retval != 0) {
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fatal_exit("event_dispatch returned error %d, "
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"errno is %s", retval, strerror(errno));
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}
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}
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void comm_base_exit(struct comm_base* b)
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{
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if(event_base_loopexit(b->eb->base, NULL) != 0) {
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log_err("Could not loopexit");
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}
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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_acc)(void*), void (*start_acc)(void*), void* arg)
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{
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b->stop_accept = stop_acc;
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b->start_accept = start_acc;
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b->cb_arg = arg;
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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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return b->eb->base;
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}
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/** see if errno for udp has to be logged or not uses globals */
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static int
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udp_send_errno_needs_log(struct sockaddr* addr, socklen_t addrlen)
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{
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/* do not log transient errors (unless high verbosity) */
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#if defined(ENETUNREACH) || defined(EHOSTDOWN) || defined(EHOSTUNREACH) || defined(ENETDOWN)
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switch(errno) {
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# ifdef ENETUNREACH
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case ENETUNREACH:
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# endif
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# ifdef EHOSTDOWN
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case EHOSTDOWN:
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# endif
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# ifdef EHOSTUNREACH
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case EHOSTUNREACH:
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# endif
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# ifdef ENETDOWN
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case ENETDOWN:
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# endif
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if(verbosity < VERB_ALGO)
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return 0;
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default:
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break;
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}
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#endif
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/* permission denied is gotten for every send if the
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* network is disconnected (on some OS), squelch it */
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if(errno == EPERM && verbosity < VERB_DETAIL)
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return 0;
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/* squelch errors where people deploy AAAA ::ffff:bla for
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* authority servers, which we try for intranets. */
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if(errno == EINVAL && addr_is_ip4mapped(
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(struct sockaddr_storage*)addr, addrlen) &&
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verbosity < VERB_DETAIL)
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return 0;
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/* SO_BROADCAST sockopt can give access to 255.255.255.255,
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* but a dns cache does not need it. */
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if(errno == EACCES && addr_is_broadcast(
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(struct sockaddr_storage*)addr, addrlen) &&
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verbosity < VERB_DETAIL)
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return 0;
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return 1;
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}
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int tcp_connect_errno_needs_log(struct sockaddr* addr, socklen_t addrlen)
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{
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return udp_send_errno_needs_log(addr, addrlen);
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}
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/* send a UDP reply */
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int
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comm_point_send_udp_msg(struct comm_point *c, sldns_buffer* packet,
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struct sockaddr* addr, socklen_t addrlen)
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{
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ssize_t sent;
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log_assert(c->fd != -1);
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#ifdef UNBOUND_DEBUG
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if(sldns_buffer_remaining(packet) == 0)
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log_err("error: send empty UDP packet");
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#endif
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log_assert(addr && addrlen > 0);
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sent = sendto(c->fd, (void*)sldns_buffer_begin(packet),
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sldns_buffer_remaining(packet), 0,
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addr, addrlen);
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if(sent == -1) {
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if(!udp_send_errno_needs_log(addr, addrlen))
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return 0;
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#ifndef USE_WINSOCK
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verbose(VERB_OPS, "sendto failed: %s", strerror(errno));
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#else
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verbose(VERB_OPS, "sendto failed: %s",
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wsa_strerror(WSAGetLastError()));
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#endif
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log_addr(VERB_OPS, "remote address is",
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(struct sockaddr_storage*)addr, addrlen);
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return 0;
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} else if((size_t)sent != sldns_buffer_remaining(packet)) {
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log_err("sent %d in place of %d bytes",
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(int)sent, (int)sldns_buffer_remaining(packet));
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return 0;
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}
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return 1;
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}
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#if defined(AF_INET6) && defined(IPV6_PKTINFO) && (defined(HAVE_RECVMSG) || defined(HAVE_SENDMSG))
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/** print debug ancillary info */
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static void p_ancil(const char* str, struct comm_reply* r)
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{
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if(r->srctype != 4 && r->srctype != 6) {
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log_info("%s: unknown srctype %d", str, r->srctype);
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return;
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}
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if(r->srctype == 6) {
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char buf[1024];
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if(inet_ntop(AF_INET6, &r->pktinfo.v6info.ipi6_addr,
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buf, (socklen_t)sizeof(buf)) == 0) {
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(void)strlcpy(buf, "(inet_ntop error)", sizeof(buf));
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}
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buf[sizeof(buf)-1]=0;
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log_info("%s: %s %d", str, buf, r->pktinfo.v6info.ipi6_ifindex);
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} else if(r->srctype == 4) {
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#ifdef IP_PKTINFO
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char buf1[1024], buf2[1024];
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if(inet_ntop(AF_INET, &r->pktinfo.v4info.ipi_addr,
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buf1, (socklen_t)sizeof(buf1)) == 0) {
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(void)strlcpy(buf1, "(inet_ntop error)", sizeof(buf1));
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}
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buf1[sizeof(buf1)-1]=0;
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#ifdef HAVE_STRUCT_IN_PKTINFO_IPI_SPEC_DST
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if(inet_ntop(AF_INET, &r->pktinfo.v4info.ipi_spec_dst,
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buf2, (socklen_t)sizeof(buf2)) == 0) {
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(void)strlcpy(buf2, "(inet_ntop error)", sizeof(buf2));
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}
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buf2[sizeof(buf2)-1]=0;
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#else
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buf2[0]=0;
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#endif
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log_info("%s: %d %s %s", str, r->pktinfo.v4info.ipi_ifindex,
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buf1, buf2);
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#elif defined(IP_RECVDSTADDR)
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|
char buf1[1024];
|
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if(inet_ntop(AF_INET, &r->pktinfo.v4addr,
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buf1, (socklen_t)sizeof(buf1)) == 0) {
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(void)strlcpy(buf1, "(inet_ntop error)", sizeof(buf1));
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}
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buf1[sizeof(buf1)-1]=0;
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log_info("%s: %s", str, buf1);
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#endif /* IP_PKTINFO or PI_RECVDSTDADDR */
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}
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|
}
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|
#endif /* AF_INET6 && IPV6_PKTINFO && HAVE_RECVMSG||HAVE_SENDMSG */
|
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|
|
/** send a UDP reply over specified interface*/
|
|
static int
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comm_point_send_udp_msg_if(struct comm_point *c, sldns_buffer* packet,
|
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struct sockaddr* addr, socklen_t addrlen, struct comm_reply* r)
|
|
{
|
|
#if defined(AF_INET6) && defined(IPV6_PKTINFO) && defined(HAVE_SENDMSG)
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|
ssize_t sent;
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struct msghdr msg;
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struct iovec iov[1];
|
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char control[256];
|
|
#ifndef S_SPLINT_S
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|
struct cmsghdr *cmsg;
|
|
#endif /* S_SPLINT_S */
|
|
|
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log_assert(c->fd != -1);
|
|
#ifdef UNBOUND_DEBUG
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|
if(sldns_buffer_remaining(packet) == 0)
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log_err("error: send empty UDP packet");
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|
#endif
|
|
log_assert(addr && addrlen > 0);
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msg.msg_name = addr;
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msg.msg_namelen = addrlen;
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iov[0].iov_base = sldns_buffer_begin(packet);
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iov[0].iov_len = sldns_buffer_remaining(packet);
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msg.msg_iov = iov;
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msg.msg_iovlen = 1;
|
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msg.msg_control = control;
|
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#ifndef S_SPLINT_S
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|
msg.msg_controllen = sizeof(control);
|
|
#endif /* S_SPLINT_S */
|
|
msg.msg_flags = 0;
|
|
|
|
#ifndef S_SPLINT_S
|
|
cmsg = CMSG_FIRSTHDR(&msg);
|
|
if(r->srctype == 4) {
|
|
#ifdef IP_PKTINFO
|
|
msg.msg_controllen = CMSG_SPACE(sizeof(struct in_pktinfo));
|
|
log_assert(msg.msg_controllen <= sizeof(control));
|
|
cmsg->cmsg_level = IPPROTO_IP;
|
|
cmsg->cmsg_type = IP_PKTINFO;
|
|
memmove(CMSG_DATA(cmsg), &r->pktinfo.v4info,
|
|
sizeof(struct in_pktinfo));
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
|
|
#elif defined(IP_SENDSRCADDR)
|
|
msg.msg_controllen = CMSG_SPACE(sizeof(struct in_addr));
|
|
log_assert(msg.msg_controllen <= sizeof(control));
|
|
cmsg->cmsg_level = IPPROTO_IP;
|
|
cmsg->cmsg_type = IP_SENDSRCADDR;
|
|
memmove(CMSG_DATA(cmsg), &r->pktinfo.v4addr,
|
|
sizeof(struct in_addr));
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
|
|
#else
|
|
verbose(VERB_ALGO, "no IP_PKTINFO or IP_SENDSRCADDR");
|
|
msg.msg_control = NULL;
|
|
#endif /* IP_PKTINFO or IP_SENDSRCADDR */
|
|
} else if(r->srctype == 6) {
|
|
msg.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
|
|
log_assert(msg.msg_controllen <= sizeof(control));
|
|
cmsg->cmsg_level = IPPROTO_IPV6;
|
|
cmsg->cmsg_type = IPV6_PKTINFO;
|
|
memmove(CMSG_DATA(cmsg), &r->pktinfo.v6info,
|
|
sizeof(struct in6_pktinfo));
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
|
|
} else {
|
|
/* try to pass all 0 to use default route */
|
|
msg.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
|
|
log_assert(msg.msg_controllen <= sizeof(control));
|
|
cmsg->cmsg_level = IPPROTO_IPV6;
|
|
cmsg->cmsg_type = IPV6_PKTINFO;
|
|
memset(CMSG_DATA(cmsg), 0, sizeof(struct in6_pktinfo));
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
|
|
}
|
|
#endif /* S_SPLINT_S */
|
|
if(verbosity >= VERB_ALGO)
|
|
p_ancil("send_udp over interface", r);
|
|
sent = sendmsg(c->fd, &msg, 0);
|
|
if(sent == -1) {
|
|
if(!udp_send_errno_needs_log(addr, addrlen))
|
|
return 0;
|
|
verbose(VERB_OPS, "sendmsg failed: %s", strerror(errno));
|
|
log_addr(VERB_OPS, "remote address is",
|
|
(struct sockaddr_storage*)addr, addrlen);
|
|
return 0;
|
|
} else if((size_t)sent != sldns_buffer_remaining(packet)) {
|
|
log_err("sent %d in place of %d bytes",
|
|
(int)sent, (int)sldns_buffer_remaining(packet));
|
|
return 0;
|
|
}
|
|
return 1;
|
|
#else
|
|
(void)c;
|
|
(void)packet;
|
|
(void)addr;
|
|
(void)addrlen;
|
|
(void)r;
|
|
log_err("sendmsg: IPV6_PKTINFO not supported");
|
|
return 0;
|
|
#endif /* AF_INET6 && IPV6_PKTINFO && HAVE_SENDMSG */
|
|
}
|
|
|
|
void
|
|
comm_point_udp_ancil_callback(int fd, short event, void* arg)
|
|
{
|
|
#if defined(AF_INET6) && defined(IPV6_PKTINFO) && defined(HAVE_RECVMSG)
|
|
struct comm_reply rep;
|
|
struct msghdr msg;
|
|
struct iovec iov[1];
|
|
ssize_t rcv;
|
|
char ancil[256];
|
|
int i;
|
|
#ifndef S_SPLINT_S
|
|
struct cmsghdr* cmsg;
|
|
#endif /* S_SPLINT_S */
|
|
|
|
rep.c = (struct comm_point*)arg;
|
|
log_assert(rep.c->type == comm_udp);
|
|
|
|
if(!(event&EV_READ))
|
|
return;
|
|
log_assert(rep.c && rep.c->buffer && rep.c->fd == fd);
|
|
comm_base_now(rep.c->ev->base);
|
|
for(i=0; i<NUM_UDP_PER_SELECT; i++) {
|
|
sldns_buffer_clear(rep.c->buffer);
|
|
rep.addrlen = (socklen_t)sizeof(rep.addr);
|
|
log_assert(fd != -1);
|
|
log_assert(sldns_buffer_remaining(rep.c->buffer) > 0);
|
|
msg.msg_name = &rep.addr;
|
|
msg.msg_namelen = (socklen_t)sizeof(rep.addr);
|
|
iov[0].iov_base = sldns_buffer_begin(rep.c->buffer);
|
|
iov[0].iov_len = sldns_buffer_remaining(rep.c->buffer);
|
|
msg.msg_iov = iov;
|
|
msg.msg_iovlen = 1;
|
|
msg.msg_control = ancil;
|
|
#ifndef S_SPLINT_S
|
|
msg.msg_controllen = sizeof(ancil);
|
|
#endif /* S_SPLINT_S */
|
|
msg.msg_flags = 0;
|
|
rcv = recvmsg(fd, &msg, 0);
|
|
if(rcv == -1) {
|
|
if(errno != EAGAIN && errno != EINTR) {
|
|
log_err("recvmsg failed: %s", strerror(errno));
|
|
}
|
|
return;
|
|
}
|
|
rep.addrlen = msg.msg_namelen;
|
|
sldns_buffer_skip(rep.c->buffer, rcv);
|
|
sldns_buffer_flip(rep.c->buffer);
|
|
rep.srctype = 0;
|
|
#ifndef S_SPLINT_S
|
|
for(cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
|
|
cmsg = CMSG_NXTHDR(&msg, cmsg)) {
|
|
if( cmsg->cmsg_level == IPPROTO_IPV6 &&
|
|
cmsg->cmsg_type == IPV6_PKTINFO) {
|
|
rep.srctype = 6;
|
|
memmove(&rep.pktinfo.v6info, CMSG_DATA(cmsg),
|
|
sizeof(struct in6_pktinfo));
|
|
break;
|
|
#ifdef IP_PKTINFO
|
|
} else if( cmsg->cmsg_level == IPPROTO_IP &&
|
|
cmsg->cmsg_type == IP_PKTINFO) {
|
|
rep.srctype = 4;
|
|
memmove(&rep.pktinfo.v4info, CMSG_DATA(cmsg),
|
|
sizeof(struct in_pktinfo));
|
|
break;
|
|
#elif defined(IP_RECVDSTADDR)
|
|
} else if( cmsg->cmsg_level == IPPROTO_IP &&
|
|
cmsg->cmsg_type == IP_RECVDSTADDR) {
|
|
rep.srctype = 4;
|
|
memmove(&rep.pktinfo.v4addr, CMSG_DATA(cmsg),
|
|
sizeof(struct in_addr));
|
|
break;
|
|
#endif /* IP_PKTINFO or IP_RECVDSTADDR */
|
|
}
|
|
}
|
|
if(verbosity >= VERB_ALGO)
|
|
p_ancil("receive_udp on interface", &rep);
|
|
#endif /* S_SPLINT_S */
|
|
fptr_ok(fptr_whitelist_comm_point(rep.c->callback));
|
|
if((*rep.c->callback)(rep.c, rep.c->cb_arg, NETEVENT_NOERROR, &rep)) {
|
|
/* send back immediate reply */
|
|
(void)comm_point_send_udp_msg_if(rep.c, rep.c->buffer,
|
|
(struct sockaddr*)&rep.addr, rep.addrlen, &rep);
|
|
}
|
|
if(rep.c->fd == -1) /* commpoint closed */
|
|
break;
|
|
}
|
|
#else
|
|
(void)fd;
|
|
(void)event;
|
|
(void)arg;
|
|
fatal_exit("recvmsg: No support for IPV6_PKTINFO. "
|
|
"Please disable interface-automatic");
|
|
#endif /* AF_INET6 && IPV6_PKTINFO && HAVE_RECVMSG */
|
|
}
|
|
|
|
void
|
|
comm_point_udp_callback(int fd, short event, void* arg)
|
|
{
|
|
struct comm_reply rep;
|
|
ssize_t rcv;
|
|
int i;
|
|
|
|
rep.c = (struct comm_point*)arg;
|
|
log_assert(rep.c->type == comm_udp);
|
|
|
|
if(!(event&EV_READ))
|
|
return;
|
|
log_assert(rep.c && rep.c->buffer && rep.c->fd == fd);
|
|
comm_base_now(rep.c->ev->base);
|
|
for(i=0; i<NUM_UDP_PER_SELECT; i++) {
|
|
sldns_buffer_clear(rep.c->buffer);
|
|
rep.addrlen = (socklen_t)sizeof(rep.addr);
|
|
log_assert(fd != -1);
|
|
log_assert(sldns_buffer_remaining(rep.c->buffer) > 0);
|
|
rcv = recvfrom(fd, (void*)sldns_buffer_begin(rep.c->buffer),
|
|
sldns_buffer_remaining(rep.c->buffer), 0,
|
|
(struct sockaddr*)&rep.addr, &rep.addrlen);
|
|
if(rcv == -1) {
|
|
#ifndef USE_WINSOCK
|
|
if(errno != EAGAIN && errno != EINTR)
|
|
log_err("recvfrom %d failed: %s",
|
|
fd, strerror(errno));
|
|
#else
|
|
if(WSAGetLastError() != WSAEINPROGRESS &&
|
|
WSAGetLastError() != WSAECONNRESET &&
|
|
WSAGetLastError()!= WSAEWOULDBLOCK)
|
|
log_err("recvfrom failed: %s",
|
|
wsa_strerror(WSAGetLastError()));
|
|
#endif
|
|
return;
|
|
}
|
|
sldns_buffer_skip(rep.c->buffer, rcv);
|
|
sldns_buffer_flip(rep.c->buffer);
|
|
rep.srctype = 0;
|
|
fptr_ok(fptr_whitelist_comm_point(rep.c->callback));
|
|
if((*rep.c->callback)(rep.c, rep.c->cb_arg, NETEVENT_NOERROR, &rep)) {
|
|
/* send back immediate reply */
|
|
(void)comm_point_send_udp_msg(rep.c, rep.c->buffer,
|
|
(struct sockaddr*)&rep.addr, rep.addrlen);
|
|
}
|
|
if(rep.c->fd != fd) /* commpoint closed to -1 or reused for
|
|
another UDP port. Note rep.c cannot be reused with TCP fd. */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/** Use a new tcp handler for new query fd, set to read query */
|
|
static void
|
|
setup_tcp_handler(struct comm_point* c, int fd)
|
|
{
|
|
log_assert(c->type == comm_tcp);
|
|
log_assert(c->fd == -1);
|
|
sldns_buffer_clear(c->buffer);
|
|
c->tcp_is_reading = 1;
|
|
c->tcp_byte_count = 0;
|
|
comm_point_start_listening(c, fd, TCP_QUERY_TIMEOUT);
|
|
}
|
|
|
|
void comm_base_handle_slow_accept(int ATTR_UNUSED(fd),
|
|
short ATTR_UNUSED(event), void* arg)
|
|
{
|
|
struct comm_base* b = (struct comm_base*)arg;
|
|
/* timeout for the slow accept, re-enable accepts again */
|
|
if(b->start_accept) {
|
|
verbose(VERB_ALGO, "wait is over, slow accept disabled");
|
|
fptr_ok(fptr_whitelist_start_accept(b->start_accept));
|
|
(*b->start_accept)(b->cb_arg);
|
|
b->eb->slow_accept_enabled = 0;
|
|
}
|
|
}
|
|
|
|
int comm_point_perform_accept(struct comm_point* c,
|
|
struct sockaddr_storage* addr, socklen_t* addrlen)
|
|
{
|
|
int new_fd;
|
|
*addrlen = (socklen_t)sizeof(*addr);
|
|
new_fd = accept(c->fd, (struct sockaddr*)addr, addrlen);
|
|
if(new_fd == -1) {
|
|
#ifndef USE_WINSOCK
|
|
/* EINTR is signal interrupt. others are closed connection. */
|
|
if( errno == EINTR || errno == EAGAIN
|
|
#ifdef EWOULDBLOCK
|
|
|| errno == EWOULDBLOCK
|
|
#endif
|
|
#ifdef ECONNABORTED
|
|
|| errno == ECONNABORTED
|
|
#endif
|
|
#ifdef EPROTO
|
|
|| errno == EPROTO
|
|
#endif /* EPROTO */
|
|
)
|
|
return -1;
|
|
#if defined(ENFILE) && defined(EMFILE)
|
|
if(errno == ENFILE || errno == EMFILE) {
|
|
/* out of file descriptors, likely outside of our
|
|
* control. stop accept() calls for some time */
|
|
if(c->ev->base->stop_accept) {
|
|
struct comm_base* b = c->ev->base;
|
|
struct timeval tv;
|
|
verbose(VERB_ALGO, "out of file descriptors: "
|
|
"slow accept");
|
|
b->eb->slow_accept_enabled = 1;
|
|
fptr_ok(fptr_whitelist_stop_accept(
|
|
b->stop_accept));
|
|
(*b->stop_accept)(b->cb_arg);
|
|
/* set timeout, no mallocs */
|
|
tv.tv_sec = NETEVENT_SLOW_ACCEPT_TIME/1000;
|
|
tv.tv_usec = NETEVENT_SLOW_ACCEPT_TIME%1000;
|
|
event_set(&b->eb->slow_accept, -1, EV_TIMEOUT,
|
|
comm_base_handle_slow_accept, b);
|
|
if(event_base_set(b->eb->base,
|
|
&b->eb->slow_accept) != 0) {
|
|
/* we do not want to log here, because
|
|
* that would spam the logfiles.
|
|
* error: "event_base_set failed." */
|
|
}
|
|
if(event_add(&b->eb->slow_accept, &tv) != 0) {
|
|
/* we do not want to log here,
|
|
* error: "event_add failed." */
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
#endif
|
|
log_err_addr("accept failed", strerror(errno), addr, *addrlen);
|
|
#else /* USE_WINSOCK */
|
|
if(WSAGetLastError() == WSAEINPROGRESS ||
|
|
WSAGetLastError() == WSAECONNRESET)
|
|
return -1;
|
|
if(WSAGetLastError() == WSAEWOULDBLOCK) {
|
|
winsock_tcp_wouldblock(&c->ev->ev, EV_READ);
|
|
return -1;
|
|
}
|
|
log_err_addr("accept failed", wsa_strerror(WSAGetLastError()),
|
|
addr, *addrlen);
|
|
#endif
|
|
return -1;
|
|
}
|
|
fd_set_nonblock(new_fd);
|
|
return new_fd;
|
|
}
|
|
|
|
#ifdef USE_WINSOCK
|
|
static long win_bio_cb(BIO *b, int oper, const char* ATTR_UNUSED(argp),
|
|
int ATTR_UNUSED(argi), long argl, long retvalue)
|
|
{
|
|
verbose(VERB_ALGO, "bio_cb %d, %s %s %s", oper,
|
|
(oper&BIO_CB_RETURN)?"return":"before",
|
|
(oper&BIO_CB_READ)?"read":((oper&BIO_CB_WRITE)?"write":"other"),
|
|
WSAGetLastError()==WSAEWOULDBLOCK?"wsawb":"");
|
|
/* on windows, check if previous operation caused EWOULDBLOCK */
|
|
if( (oper == (BIO_CB_READ|BIO_CB_RETURN) && argl == 0) ||
|
|
(oper == (BIO_CB_GETS|BIO_CB_RETURN) && argl == 0)) {
|
|
if(WSAGetLastError() == WSAEWOULDBLOCK)
|
|
winsock_tcp_wouldblock((struct event*)
|
|
BIO_get_callback_arg(b), EV_READ);
|
|
}
|
|
if( (oper == (BIO_CB_WRITE|BIO_CB_RETURN) && argl == 0) ||
|
|
(oper == (BIO_CB_PUTS|BIO_CB_RETURN) && argl == 0)) {
|
|
if(WSAGetLastError() == WSAEWOULDBLOCK)
|
|
winsock_tcp_wouldblock((struct event*)
|
|
BIO_get_callback_arg(b), EV_WRITE);
|
|
}
|
|
/* return original return value */
|
|
return retvalue;
|
|
}
|
|
|
|
/** set win bio callbacks for nonblocking operations */
|
|
void
|
|
comm_point_tcp_win_bio_cb(struct comm_point* c, void* thessl)
|
|
{
|
|
SSL* ssl = (SSL*)thessl;
|
|
/* set them both just in case, but usually they are the same BIO */
|
|
BIO_set_callback(SSL_get_rbio(ssl), &win_bio_cb);
|
|
BIO_set_callback_arg(SSL_get_rbio(ssl), (char*)&c->ev->ev);
|
|
BIO_set_callback(SSL_get_wbio(ssl), &win_bio_cb);
|
|
BIO_set_callback_arg(SSL_get_wbio(ssl), (char*)&c->ev->ev);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
comm_point_tcp_accept_callback(int fd, short event, void* arg)
|
|
{
|
|
struct comm_point* c = (struct comm_point*)arg, *c_hdl;
|
|
int new_fd;
|
|
log_assert(c->type == comm_tcp_accept);
|
|
if(!(event & EV_READ)) {
|
|
log_info("ignoring tcp accept event %d", (int)event);
|
|
return;
|
|
}
|
|
comm_base_now(c->ev->base);
|
|
/* find free tcp handler. */
|
|
if(!c->tcp_free) {
|
|
log_warn("accepted too many tcp, connections full");
|
|
return;
|
|
}
|
|
/* accept incoming connection. */
|
|
c_hdl = c->tcp_free;
|
|
log_assert(fd != -1);
|
|
new_fd = comm_point_perform_accept(c, &c_hdl->repinfo.addr,
|
|
&c_hdl->repinfo.addrlen);
|
|
if(new_fd == -1)
|
|
return;
|
|
if(c->ssl) {
|
|
c_hdl->ssl = incoming_ssl_fd(c->ssl, new_fd);
|
|
if(!c_hdl->ssl) {
|
|
c_hdl->fd = new_fd;
|
|
comm_point_close(c_hdl);
|
|
return;
|
|
}
|
|
c_hdl->ssl_shake_state = comm_ssl_shake_read;
|
|
#ifdef USE_WINSOCK
|
|
comm_point_tcp_win_bio_cb(c_hdl, c_hdl->ssl);
|
|
#endif
|
|
}
|
|
|
|
/* grab the tcp handler buffers */
|
|
c->tcp_free = c_hdl->tcp_free;
|
|
if(!c->tcp_free) {
|
|
/* stop accepting incoming queries for now. */
|
|
comm_point_stop_listening(c);
|
|
}
|
|
/* addr is dropped. Not needed for tcp reply. */
|
|
setup_tcp_handler(c_hdl, new_fd);
|
|
}
|
|
|
|
/** Make tcp handler free for next assignment */
|
|
static void
|
|
reclaim_tcp_handler(struct comm_point* c)
|
|
{
|
|
log_assert(c->type == comm_tcp);
|
|
if(c->ssl) {
|
|
#ifdef HAVE_SSL
|
|
SSL_shutdown(c->ssl);
|
|
SSL_free(c->ssl);
|
|
c->ssl = NULL;
|
|
#endif
|
|
}
|
|
comm_point_close(c);
|
|
if(c->tcp_parent) {
|
|
c->tcp_free = c->tcp_parent->tcp_free;
|
|
c->tcp_parent->tcp_free = c;
|
|
if(!c->tcp_free) {
|
|
/* re-enable listening on accept socket */
|
|
comm_point_start_listening(c->tcp_parent, -1, -1);
|
|
}
|
|
}
|
|
}
|
|
|
|
/** do the callback when writing is done */
|
|
static void
|
|
tcp_callback_writer(struct comm_point* c)
|
|
{
|
|
log_assert(c->type == comm_tcp);
|
|
sldns_buffer_clear(c->buffer);
|
|
if(c->tcp_do_toggle_rw)
|
|
c->tcp_is_reading = 1;
|
|
c->tcp_byte_count = 0;
|
|
/* switch from listening(write) to listening(read) */
|
|
comm_point_stop_listening(c);
|
|
comm_point_start_listening(c, -1, -1);
|
|
}
|
|
|
|
/** do the callback when reading is done */
|
|
static void
|
|
tcp_callback_reader(struct comm_point* c)
|
|
{
|
|
log_assert(c->type == comm_tcp || c->type == comm_local);
|
|
sldns_buffer_flip(c->buffer);
|
|
if(c->tcp_do_toggle_rw)
|
|
c->tcp_is_reading = 0;
|
|
c->tcp_byte_count = 0;
|
|
if(c->type == comm_tcp)
|
|
comm_point_stop_listening(c);
|
|
fptr_ok(fptr_whitelist_comm_point(c->callback));
|
|
if( (*c->callback)(c, c->cb_arg, NETEVENT_NOERROR, &c->repinfo) ) {
|
|
comm_point_start_listening(c, -1, TCP_QUERY_TIMEOUT);
|
|
}
|
|
}
|
|
|
|
/** continue ssl handshake */
|
|
#ifdef HAVE_SSL
|
|
static int
|
|
ssl_handshake(struct comm_point* c)
|
|
{
|
|
int r;
|
|
if(c->ssl_shake_state == comm_ssl_shake_hs_read) {
|
|
/* read condition satisfied back to writing */
|
|
comm_point_listen_for_rw(c, 1, 1);
|
|
c->ssl_shake_state = comm_ssl_shake_none;
|
|
return 1;
|
|
}
|
|
if(c->ssl_shake_state == comm_ssl_shake_hs_write) {
|
|
/* write condition satisfied, back to reading */
|
|
comm_point_listen_for_rw(c, 1, 0);
|
|
c->ssl_shake_state = comm_ssl_shake_none;
|
|
return 1;
|
|
}
|
|
|
|
ERR_clear_error();
|
|
r = SSL_do_handshake(c->ssl);
|
|
if(r != 1) {
|
|
int want = SSL_get_error(c->ssl, r);
|
|
if(want == SSL_ERROR_WANT_READ) {
|
|
if(c->ssl_shake_state == comm_ssl_shake_read)
|
|
return 1;
|
|
c->ssl_shake_state = comm_ssl_shake_read;
|
|
comm_point_listen_for_rw(c, 1, 0);
|
|
return 1;
|
|
} else if(want == SSL_ERROR_WANT_WRITE) {
|
|
if(c->ssl_shake_state == comm_ssl_shake_write)
|
|
return 1;
|
|
c->ssl_shake_state = comm_ssl_shake_write;
|
|
comm_point_listen_for_rw(c, 0, 1);
|
|
return 1;
|
|
} else if(r == 0) {
|
|
return 0; /* closed */
|
|
} else if(want == SSL_ERROR_SYSCALL) {
|
|
/* SYSCALL and errno==0 means closed uncleanly */
|
|
if(errno != 0)
|
|
log_err("SSL_handshake syscall: %s",
|
|
strerror(errno));
|
|
return 0;
|
|
} else {
|
|
log_crypto_err("ssl handshake failed");
|
|
log_addr(1, "ssl handshake failed", &c->repinfo.addr,
|
|
c->repinfo.addrlen);
|
|
return 0;
|
|
}
|
|
}
|
|
/* this is where peer verification could take place */
|
|
log_addr(VERB_ALGO, "SSL DNS connection", &c->repinfo.addr,
|
|
c->repinfo.addrlen);
|
|
|
|
/* setup listen rw correctly */
|
|
if(c->tcp_is_reading) {
|
|
if(c->ssl_shake_state != comm_ssl_shake_read)
|
|
comm_point_listen_for_rw(c, 1, 0);
|
|
} else {
|
|
comm_point_listen_for_rw(c, 1, 1);
|
|
}
|
|
c->ssl_shake_state = comm_ssl_shake_none;
|
|
return 1;
|
|
}
|
|
#endif /* HAVE_SSL */
|
|
|
|
/** ssl read callback on TCP */
|
|
static int
|
|
ssl_handle_read(struct comm_point* c)
|
|
{
|
|
#ifdef HAVE_SSL
|
|
int r;
|
|
if(c->ssl_shake_state != comm_ssl_shake_none) {
|
|
if(!ssl_handshake(c))
|
|
return 0;
|
|
if(c->ssl_shake_state != comm_ssl_shake_none)
|
|
return 1;
|
|
}
|
|
if(c->tcp_byte_count < sizeof(uint16_t)) {
|
|
/* read length bytes */
|
|
ERR_clear_error();
|
|
if((r=SSL_read(c->ssl, (void*)sldns_buffer_at(c->buffer,
|
|
c->tcp_byte_count), (int)(sizeof(uint16_t) -
|
|
c->tcp_byte_count))) <= 0) {
|
|
int want = SSL_get_error(c->ssl, r);
|
|
if(want == SSL_ERROR_ZERO_RETURN) {
|
|
return 0; /* shutdown, closed */
|
|
} else if(want == SSL_ERROR_WANT_READ) {
|
|
return 1; /* read more later */
|
|
} else if(want == SSL_ERROR_WANT_WRITE) {
|
|
c->ssl_shake_state = comm_ssl_shake_hs_write;
|
|
comm_point_listen_for_rw(c, 0, 1);
|
|
return 1;
|
|
} else if(want == SSL_ERROR_SYSCALL) {
|
|
if(errno != 0)
|
|
log_err("SSL_read syscall: %s",
|
|
strerror(errno));
|
|
return 0;
|
|
}
|
|
log_crypto_err("could not SSL_read");
|
|
return 0;
|
|
}
|
|
c->tcp_byte_count += r;
|
|
if(c->tcp_byte_count != sizeof(uint16_t))
|
|
return 1;
|
|
if(sldns_buffer_read_u16_at(c->buffer, 0) >
|
|
sldns_buffer_capacity(c->buffer)) {
|
|
verbose(VERB_QUERY, "ssl: dropped larger than buffer");
|
|
return 0;
|
|
}
|
|
sldns_buffer_set_limit(c->buffer,
|
|
sldns_buffer_read_u16_at(c->buffer, 0));
|
|
if(sldns_buffer_limit(c->buffer) < LDNS_HEADER_SIZE) {
|
|
verbose(VERB_QUERY, "ssl: dropped bogus too short.");
|
|
return 0;
|
|
}
|
|
verbose(VERB_ALGO, "Reading ssl tcp query of length %d",
|
|
(int)sldns_buffer_limit(c->buffer));
|
|
}
|
|
log_assert(sldns_buffer_remaining(c->buffer) > 0);
|
|
ERR_clear_error();
|
|
r = SSL_read(c->ssl, (void*)sldns_buffer_current(c->buffer),
|
|
(int)sldns_buffer_remaining(c->buffer));
|
|
if(r <= 0) {
|
|
int want = SSL_get_error(c->ssl, r);
|
|
if(want == SSL_ERROR_ZERO_RETURN) {
|
|
return 0; /* shutdown, closed */
|
|
} else if(want == SSL_ERROR_WANT_READ) {
|
|
return 1; /* read more later */
|
|
} else if(want == SSL_ERROR_WANT_WRITE) {
|
|
c->ssl_shake_state = comm_ssl_shake_hs_write;
|
|
comm_point_listen_for_rw(c, 0, 1);
|
|
return 1;
|
|
} else if(want == SSL_ERROR_SYSCALL) {
|
|
if(errno != 0)
|
|
log_err("SSL_read syscall: %s",
|
|
strerror(errno));
|
|
return 0;
|
|
}
|
|
log_crypto_err("could not SSL_read");
|
|
return 0;
|
|
}
|
|
sldns_buffer_skip(c->buffer, (ssize_t)r);
|
|
if(sldns_buffer_remaining(c->buffer) <= 0) {
|
|
tcp_callback_reader(c);
|
|
}
|
|
return 1;
|
|
#else
|
|
(void)c;
|
|
return 0;
|
|
#endif /* HAVE_SSL */
|
|
}
|
|
|
|
/** ssl write callback on TCP */
|
|
static int
|
|
ssl_handle_write(struct comm_point* c)
|
|
{
|
|
#ifdef HAVE_SSL
|
|
int r;
|
|
if(c->ssl_shake_state != comm_ssl_shake_none) {
|
|
if(!ssl_handshake(c))
|
|
return 0;
|
|
if(c->ssl_shake_state != comm_ssl_shake_none)
|
|
return 1;
|
|
}
|
|
/* ignore return, if fails we may simply block */
|
|
(void)SSL_set_mode(c->ssl, SSL_MODE_ENABLE_PARTIAL_WRITE);
|
|
if(c->tcp_byte_count < sizeof(uint16_t)) {
|
|
uint16_t len = htons(sldns_buffer_limit(c->buffer));
|
|
ERR_clear_error();
|
|
r = SSL_write(c->ssl,
|
|
(void*)(((uint8_t*)&len)+c->tcp_byte_count),
|
|
(int)(sizeof(uint16_t)-c->tcp_byte_count));
|
|
if(r <= 0) {
|
|
int want = SSL_get_error(c->ssl, r);
|
|
if(want == SSL_ERROR_ZERO_RETURN) {
|
|
return 0; /* closed */
|
|
} else if(want == SSL_ERROR_WANT_READ) {
|
|
c->ssl_shake_state = comm_ssl_shake_read;
|
|
comm_point_listen_for_rw(c, 1, 0);
|
|
return 1; /* wait for read condition */
|
|
} else if(want == SSL_ERROR_WANT_WRITE) {
|
|
return 1; /* write more later */
|
|
} else if(want == SSL_ERROR_SYSCALL) {
|
|
if(errno != 0)
|
|
log_err("SSL_write syscall: %s",
|
|
strerror(errno));
|
|
return 0;
|
|
}
|
|
log_crypto_err("could not SSL_write");
|
|
return 0;
|
|
}
|
|
c->tcp_byte_count += r;
|
|
if(c->tcp_byte_count < sizeof(uint16_t))
|
|
return 1;
|
|
sldns_buffer_set_position(c->buffer, c->tcp_byte_count -
|
|
sizeof(uint16_t));
|
|
if(sldns_buffer_remaining(c->buffer) == 0) {
|
|
tcp_callback_writer(c);
|
|
return 1;
|
|
}
|
|
}
|
|
log_assert(sldns_buffer_remaining(c->buffer) > 0);
|
|
ERR_clear_error();
|
|
r = SSL_write(c->ssl, (void*)sldns_buffer_current(c->buffer),
|
|
(int)sldns_buffer_remaining(c->buffer));
|
|
if(r <= 0) {
|
|
int want = SSL_get_error(c->ssl, r);
|
|
if(want == SSL_ERROR_ZERO_RETURN) {
|
|
return 0; /* closed */
|
|
} else if(want == SSL_ERROR_WANT_READ) {
|
|
c->ssl_shake_state = comm_ssl_shake_read;
|
|
comm_point_listen_for_rw(c, 1, 0);
|
|
return 1; /* wait for read condition */
|
|
} else if(want == SSL_ERROR_WANT_WRITE) {
|
|
return 1; /* write more later */
|
|
} else if(want == SSL_ERROR_SYSCALL) {
|
|
if(errno != 0)
|
|
log_err("SSL_write syscall: %s",
|
|
strerror(errno));
|
|
return 0;
|
|
}
|
|
log_crypto_err("could not SSL_write");
|
|
return 0;
|
|
}
|
|
sldns_buffer_skip(c->buffer, (ssize_t)r);
|
|
|
|
if(sldns_buffer_remaining(c->buffer) == 0) {
|
|
tcp_callback_writer(c);
|
|
}
|
|
return 1;
|
|
#else
|
|
(void)c;
|
|
return 0;
|
|
#endif /* HAVE_SSL */
|
|
}
|
|
|
|
/** handle ssl tcp connection with dns contents */
|
|
static int
|
|
ssl_handle_it(struct comm_point* c)
|
|
{
|
|
if(c->tcp_is_reading)
|
|
return ssl_handle_read(c);
|
|
return ssl_handle_write(c);
|
|
}
|
|
|
|
/** Handle tcp reading callback.
|
|
* @param fd: file descriptor of socket.
|
|
* @param c: comm point to read from into buffer.
|
|
* @param short_ok: if true, very short packets are OK (for comm_local).
|
|
* @return: 0 on error
|
|
*/
|
|
static int
|
|
comm_point_tcp_handle_read(int fd, struct comm_point* c, int short_ok)
|
|
{
|
|
ssize_t r;
|
|
log_assert(c->type == comm_tcp || c->type == comm_local);
|
|
if(c->ssl)
|
|
return ssl_handle_it(c);
|
|
if(!c->tcp_is_reading)
|
|
return 0;
|
|
|
|
log_assert(fd != -1);
|
|
if(c->tcp_byte_count < sizeof(uint16_t)) {
|
|
/* read length bytes */
|
|
r = recv(fd,(void*)sldns_buffer_at(c->buffer,c->tcp_byte_count),
|
|
sizeof(uint16_t)-c->tcp_byte_count, 0);
|
|
if(r == 0)
|
|
return 0;
|
|
else if(r == -1) {
|
|
#ifndef USE_WINSOCK
|
|
if(errno == EINTR || errno == EAGAIN)
|
|
return 1;
|
|
#ifdef ECONNRESET
|
|
if(errno == ECONNRESET && verbosity < 2)
|
|
return 0; /* silence reset by peer */
|
|
#endif
|
|
log_err_addr("read (in tcp s)", strerror(errno),
|
|
&c->repinfo.addr, c->repinfo.addrlen);
|
|
#else /* USE_WINSOCK */
|
|
if(WSAGetLastError() == WSAECONNRESET)
|
|
return 0;
|
|
if(WSAGetLastError() == WSAEINPROGRESS)
|
|
return 1;
|
|
if(WSAGetLastError() == WSAEWOULDBLOCK) {
|
|
winsock_tcp_wouldblock(&c->ev->ev, EV_READ);
|
|
return 1;
|
|
}
|
|
log_err_addr("read (in tcp s)",
|
|
wsa_strerror(WSAGetLastError()),
|
|
&c->repinfo.addr, c->repinfo.addrlen);
|
|
#endif
|
|
return 0;
|
|
}
|
|
c->tcp_byte_count += r;
|
|
if(c->tcp_byte_count != sizeof(uint16_t))
|
|
return 1;
|
|
if(sldns_buffer_read_u16_at(c->buffer, 0) >
|
|
sldns_buffer_capacity(c->buffer)) {
|
|
verbose(VERB_QUERY, "tcp: dropped larger than buffer");
|
|
return 0;
|
|
}
|
|
sldns_buffer_set_limit(c->buffer,
|
|
sldns_buffer_read_u16_at(c->buffer, 0));
|
|
if(!short_ok &&
|
|
sldns_buffer_limit(c->buffer) < LDNS_HEADER_SIZE) {
|
|
verbose(VERB_QUERY, "tcp: dropped bogus too short.");
|
|
return 0;
|
|
}
|
|
verbose(VERB_ALGO, "Reading tcp query of length %d",
|
|
(int)sldns_buffer_limit(c->buffer));
|
|
}
|
|
|
|
log_assert(sldns_buffer_remaining(c->buffer) > 0);
|
|
r = recv(fd, (void*)sldns_buffer_current(c->buffer),
|
|
sldns_buffer_remaining(c->buffer), 0);
|
|
if(r == 0) {
|
|
return 0;
|
|
} else if(r == -1) {
|
|
#ifndef USE_WINSOCK
|
|
if(errno == EINTR || errno == EAGAIN)
|
|
return 1;
|
|
log_err_addr("read (in tcp r)", strerror(errno),
|
|
&c->repinfo.addr, c->repinfo.addrlen);
|
|
#else /* USE_WINSOCK */
|
|
if(WSAGetLastError() == WSAECONNRESET)
|
|
return 0;
|
|
if(WSAGetLastError() == WSAEINPROGRESS)
|
|
return 1;
|
|
if(WSAGetLastError() == WSAEWOULDBLOCK) {
|
|
winsock_tcp_wouldblock(&c->ev->ev, EV_READ);
|
|
return 1;
|
|
}
|
|
log_err_addr("read (in tcp r)",
|
|
wsa_strerror(WSAGetLastError()),
|
|
&c->repinfo.addr, c->repinfo.addrlen);
|
|
#endif
|
|
return 0;
|
|
}
|
|
sldns_buffer_skip(c->buffer, r);
|
|
if(sldns_buffer_remaining(c->buffer) <= 0) {
|
|
tcp_callback_reader(c);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* Handle tcp writing callback.
|
|
* @param fd: file descriptor of socket.
|
|
* @param c: comm point to write buffer out of.
|
|
* @return: 0 on error
|
|
*/
|
|
static int
|
|
comm_point_tcp_handle_write(int fd, struct comm_point* c)
|
|
{
|
|
ssize_t r;
|
|
log_assert(c->type == comm_tcp);
|
|
if(c->tcp_is_reading && !c->ssl)
|
|
return 0;
|
|
log_assert(fd != -1);
|
|
if(c->tcp_byte_count == 0 && c->tcp_check_nb_connect) {
|
|
/* check for pending error from nonblocking connect */
|
|
/* from Stevens, unix network programming, vol1, 3rd ed, p450*/
|
|
int error = 0;
|
|
socklen_t len = (socklen_t)sizeof(error);
|
|
if(getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&error,
|
|
&len) < 0){
|
|
#ifndef USE_WINSOCK
|
|
error = errno; /* on solaris errno is error */
|
|
#else /* USE_WINSOCK */
|
|
error = WSAGetLastError();
|
|
#endif
|
|
}
|
|
#ifndef USE_WINSOCK
|
|
#if defined(EINPROGRESS) && defined(EWOULDBLOCK)
|
|
if(error == EINPROGRESS || error == EWOULDBLOCK)
|
|
return 1; /* try again later */
|
|
else
|
|
#endif
|
|
if(error != 0 && verbosity < 2)
|
|
return 0; /* silence lots of chatter in the logs */
|
|
else if(error != 0) {
|
|
log_err_addr("tcp connect", strerror(error),
|
|
&c->repinfo.addr, c->repinfo.addrlen);
|
|
#else /* USE_WINSOCK */
|
|
/* examine error */
|
|
if(error == WSAEINPROGRESS)
|
|
return 1;
|
|
else if(error == WSAEWOULDBLOCK) {
|
|
winsock_tcp_wouldblock(&c->ev->ev, EV_WRITE);
|
|
return 1;
|
|
} else if(error != 0 && verbosity < 2)
|
|
return 0;
|
|
else if(error != 0) {
|
|
log_err_addr("tcp connect", wsa_strerror(error),
|
|
&c->repinfo.addr, c->repinfo.addrlen);
|
|
#endif /* USE_WINSOCK */
|
|
return 0;
|
|
}
|
|
}
|
|
if(c->ssl)
|
|
return ssl_handle_it(c);
|
|
|
|
if(c->tcp_byte_count < sizeof(uint16_t)) {
|
|
uint16_t len = htons(sldns_buffer_limit(c->buffer));
|
|
#ifdef HAVE_WRITEV
|
|
struct iovec iov[2];
|
|
iov[0].iov_base = (uint8_t*)&len + c->tcp_byte_count;
|
|
iov[0].iov_len = sizeof(uint16_t) - c->tcp_byte_count;
|
|
iov[1].iov_base = sldns_buffer_begin(c->buffer);
|
|
iov[1].iov_len = sldns_buffer_limit(c->buffer);
|
|
log_assert(iov[0].iov_len > 0);
|
|
log_assert(iov[1].iov_len > 0);
|
|
r = writev(fd, iov, 2);
|
|
#else /* HAVE_WRITEV */
|
|
r = send(fd, (void*)(((uint8_t*)&len)+c->tcp_byte_count),
|
|
sizeof(uint16_t)-c->tcp_byte_count, 0);
|
|
#endif /* HAVE_WRITEV */
|
|
if(r == -1) {
|
|
#ifndef USE_WINSOCK
|
|
# ifdef EPIPE
|
|
if(errno == EPIPE && verbosity < 2)
|
|
return 0; /* silence 'broken pipe' */
|
|
#endif
|
|
if(errno == EINTR || errno == EAGAIN)
|
|
return 1;
|
|
# ifdef HAVE_WRITEV
|
|
log_err_addr("tcp writev", strerror(errno),
|
|
&c->repinfo.addr, c->repinfo.addrlen);
|
|
# else /* HAVE_WRITEV */
|
|
log_err_addr("tcp send s", strerror(errno),
|
|
&c->repinfo.addr, c->repinfo.addrlen);
|
|
# endif /* HAVE_WRITEV */
|
|
#else
|
|
if(WSAGetLastError() == WSAENOTCONN)
|
|
return 1;
|
|
if(WSAGetLastError() == WSAEINPROGRESS)
|
|
return 1;
|
|
if(WSAGetLastError() == WSAEWOULDBLOCK) {
|
|
winsock_tcp_wouldblock(&c->ev->ev, EV_WRITE);
|
|
return 1;
|
|
}
|
|
log_err_addr("tcp send s",
|
|
wsa_strerror(WSAGetLastError()),
|
|
&c->repinfo.addr, c->repinfo.addrlen);
|
|
#endif
|
|
return 0;
|
|
}
|
|
c->tcp_byte_count += r;
|
|
if(c->tcp_byte_count < sizeof(uint16_t))
|
|
return 1;
|
|
sldns_buffer_set_position(c->buffer, c->tcp_byte_count -
|
|
sizeof(uint16_t));
|
|
if(sldns_buffer_remaining(c->buffer) == 0) {
|
|
tcp_callback_writer(c);
|
|
return 1;
|
|
}
|
|
}
|
|
log_assert(sldns_buffer_remaining(c->buffer) > 0);
|
|
r = send(fd, (void*)sldns_buffer_current(c->buffer),
|
|
sldns_buffer_remaining(c->buffer), 0);
|
|
if(r == -1) {
|
|
#ifndef USE_WINSOCK
|
|
if(errno == EINTR || errno == EAGAIN)
|
|
return 1;
|
|
log_err_addr("tcp send r", strerror(errno),
|
|
&c->repinfo.addr, c->repinfo.addrlen);
|
|
#else
|
|
if(WSAGetLastError() == WSAEINPROGRESS)
|
|
return 1;
|
|
if(WSAGetLastError() == WSAEWOULDBLOCK) {
|
|
winsock_tcp_wouldblock(&c->ev->ev, EV_WRITE);
|
|
return 1;
|
|
}
|
|
log_err_addr("tcp send r", wsa_strerror(WSAGetLastError()),
|
|
&c->repinfo.addr, c->repinfo.addrlen);
|
|
#endif
|
|
return 0;
|
|
}
|
|
sldns_buffer_skip(c->buffer, r);
|
|
|
|
if(sldns_buffer_remaining(c->buffer) == 0) {
|
|
tcp_callback_writer(c);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
comm_point_tcp_handle_callback(int fd, short event, void* arg)
|
|
{
|
|
struct comm_point* c = (struct comm_point*)arg;
|
|
log_assert(c->type == comm_tcp);
|
|
comm_base_now(c->ev->base);
|
|
|
|
if(event&EV_READ) {
|
|
if(!comm_point_tcp_handle_read(fd, c, 0)) {
|
|
reclaim_tcp_handler(c);
|
|
if(!c->tcp_do_close) {
|
|
fptr_ok(fptr_whitelist_comm_point(
|
|
c->callback));
|
|
(void)(*c->callback)(c, c->cb_arg,
|
|
NETEVENT_CLOSED, NULL);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
if(event&EV_WRITE) {
|
|
if(!comm_point_tcp_handle_write(fd, c)) {
|
|
reclaim_tcp_handler(c);
|
|
if(!c->tcp_do_close) {
|
|
fptr_ok(fptr_whitelist_comm_point(
|
|
c->callback));
|
|
(void)(*c->callback)(c, c->cb_arg,
|
|
NETEVENT_CLOSED, NULL);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
if(event&EV_TIMEOUT) {
|
|
verbose(VERB_QUERY, "tcp took too long, dropped");
|
|
reclaim_tcp_handler(c);
|
|
if(!c->tcp_do_close) {
|
|
fptr_ok(fptr_whitelist_comm_point(c->callback));
|
|
(void)(*c->callback)(c, c->cb_arg,
|
|
NETEVENT_TIMEOUT, NULL);
|
|
}
|
|
return;
|
|
}
|
|
log_err("Ignored event %d for tcphdl.", event);
|
|
}
|
|
|
|
void comm_point_local_handle_callback(int fd, short event, void* arg)
|
|
{
|
|
struct comm_point* c = (struct comm_point*)arg;
|
|
log_assert(c->type == comm_local);
|
|
comm_base_now(c->ev->base);
|
|
|
|
if(event&EV_READ) {
|
|
if(!comm_point_tcp_handle_read(fd, c, 1)) {
|
|
fptr_ok(fptr_whitelist_comm_point(c->callback));
|
|
(void)(*c->callback)(c, c->cb_arg, NETEVENT_CLOSED,
|
|
NULL);
|
|
}
|
|
return;
|
|
}
|
|
log_err("Ignored event %d for localhdl.", event);
|
|
}
|
|
|
|
void comm_point_raw_handle_callback(int ATTR_UNUSED(fd),
|
|
short event, void* arg)
|
|
{
|
|
struct comm_point* c = (struct comm_point*)arg;
|
|
int err = NETEVENT_NOERROR;
|
|
log_assert(c->type == comm_raw);
|
|
comm_base_now(c->ev->base);
|
|
|
|
if(event&EV_TIMEOUT)
|
|
err = NETEVENT_TIMEOUT;
|
|
fptr_ok(fptr_whitelist_comm_point_raw(c->callback));
|
|
(void)(*c->callback)(c, c->cb_arg, err, NULL);
|
|
}
|
|
|
|
struct comm_point*
|
|
comm_point_create_udp(struct comm_base *base, int fd, sldns_buffer* buffer,
|
|
comm_point_callback_t* callback, void* callback_arg)
|
|
{
|
|
struct comm_point* c = (struct comm_point*)calloc(1,
|
|
sizeof(struct comm_point));
|
|
short evbits;
|
|
if(!c)
|
|
return NULL;
|
|
c->ev = (struct internal_event*)calloc(1,
|
|
sizeof(struct internal_event));
|
|
if(!c->ev) {
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
c->ev->base = base;
|
|
c->fd = fd;
|
|
c->buffer = buffer;
|
|
c->timeout = NULL;
|
|
c->tcp_is_reading = 0;
|
|
c->tcp_byte_count = 0;
|
|
c->tcp_parent = NULL;
|
|
c->max_tcp_count = 0;
|
|
c->tcp_handlers = NULL;
|
|
c->tcp_free = NULL;
|
|
c->type = comm_udp;
|
|
c->tcp_do_close = 0;
|
|
c->do_not_close = 0;
|
|
c->tcp_do_toggle_rw = 0;
|
|
c->tcp_check_nb_connect = 0;
|
|
c->inuse = 0;
|
|
c->callback = callback;
|
|
c->cb_arg = callback_arg;
|
|
evbits = EV_READ | EV_PERSIST;
|
|
/* libevent stuff */
|
|
event_set(&c->ev->ev, c->fd, evbits, comm_point_udp_callback, c);
|
|
if(event_base_set(base->eb->base, &c->ev->ev) != 0) {
|
|
log_err("could not baseset udp event");
|
|
comm_point_delete(c);
|
|
return NULL;
|
|
}
|
|
if(fd!=-1 && event_add(&c->ev->ev, c->timeout) != 0 ) {
|
|
log_err("could not add udp event");
|
|
comm_point_delete(c);
|
|
return NULL;
|
|
}
|
|
return c;
|
|
}
|
|
|
|
struct comm_point*
|
|
comm_point_create_udp_ancil(struct comm_base *base, int fd,
|
|
sldns_buffer* buffer,
|
|
comm_point_callback_t* callback, void* callback_arg)
|
|
{
|
|
struct comm_point* c = (struct comm_point*)calloc(1,
|
|
sizeof(struct comm_point));
|
|
short evbits;
|
|
if(!c)
|
|
return NULL;
|
|
c->ev = (struct internal_event*)calloc(1,
|
|
sizeof(struct internal_event));
|
|
if(!c->ev) {
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
c->ev->base = base;
|
|
c->fd = fd;
|
|
c->buffer = buffer;
|
|
c->timeout = NULL;
|
|
c->tcp_is_reading = 0;
|
|
c->tcp_byte_count = 0;
|
|
c->tcp_parent = NULL;
|
|
c->max_tcp_count = 0;
|
|
c->tcp_handlers = NULL;
|
|
c->tcp_free = NULL;
|
|
c->type = comm_udp;
|
|
c->tcp_do_close = 0;
|
|
c->do_not_close = 0;
|
|
c->inuse = 0;
|
|
c->tcp_do_toggle_rw = 0;
|
|
c->tcp_check_nb_connect = 0;
|
|
c->callback = callback;
|
|
c->cb_arg = callback_arg;
|
|
evbits = EV_READ | EV_PERSIST;
|
|
/* libevent stuff */
|
|
event_set(&c->ev->ev, c->fd, evbits, comm_point_udp_ancil_callback, c);
|
|
if(event_base_set(base->eb->base, &c->ev->ev) != 0) {
|
|
log_err("could not baseset udp event");
|
|
comm_point_delete(c);
|
|
return NULL;
|
|
}
|
|
if(fd!=-1 && event_add(&c->ev->ev, c->timeout) != 0 ) {
|
|
log_err("could not add udp event");
|
|
comm_point_delete(c);
|
|
return NULL;
|
|
}
|
|
return c;
|
|
}
|
|
|
|
static struct comm_point*
|
|
comm_point_create_tcp_handler(struct comm_base *base,
|
|
struct comm_point* parent, size_t bufsize,
|
|
comm_point_callback_t* callback, void* callback_arg)
|
|
{
|
|
struct comm_point* c = (struct comm_point*)calloc(1,
|
|
sizeof(struct comm_point));
|
|
short evbits;
|
|
if(!c)
|
|
return NULL;
|
|
c->ev = (struct internal_event*)calloc(1,
|
|
sizeof(struct internal_event));
|
|
if(!c->ev) {
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
c->ev->base = base;
|
|
c->fd = -1;
|
|
c->buffer = sldns_buffer_new(bufsize);
|
|
if(!c->buffer) {
|
|
free(c->ev);
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
c->timeout = (struct timeval*)malloc(sizeof(struct timeval));
|
|
if(!c->timeout) {
|
|
sldns_buffer_free(c->buffer);
|
|
free(c->ev);
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
c->tcp_is_reading = 0;
|
|
c->tcp_byte_count = 0;
|
|
c->tcp_parent = parent;
|
|
c->max_tcp_count = 0;
|
|
c->tcp_handlers = NULL;
|
|
c->tcp_free = NULL;
|
|
c->type = comm_tcp;
|
|
c->tcp_do_close = 0;
|
|
c->do_not_close = 0;
|
|
c->tcp_do_toggle_rw = 1;
|
|
c->tcp_check_nb_connect = 0;
|
|
c->repinfo.c = c;
|
|
c->callback = callback;
|
|
c->cb_arg = callback_arg;
|
|
/* add to parent free list */
|
|
c->tcp_free = parent->tcp_free;
|
|
parent->tcp_free = c;
|
|
/* libevent stuff */
|
|
evbits = EV_PERSIST | EV_READ | EV_TIMEOUT;
|
|
event_set(&c->ev->ev, c->fd, evbits, comm_point_tcp_handle_callback, c);
|
|
if(event_base_set(base->eb->base, &c->ev->ev) != 0)
|
|
{
|
|
log_err("could not basetset tcphdl event");
|
|
parent->tcp_free = c->tcp_free;
|
|
free(c->ev);
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
return c;
|
|
}
|
|
|
|
struct comm_point*
|
|
comm_point_create_tcp(struct comm_base *base, int fd, int num, size_t bufsize,
|
|
comm_point_callback_t* callback, void* callback_arg)
|
|
{
|
|
struct comm_point* c = (struct comm_point*)calloc(1,
|
|
sizeof(struct comm_point));
|
|
short evbits;
|
|
int i;
|
|
/* first allocate the TCP accept listener */
|
|
if(!c)
|
|
return NULL;
|
|
c->ev = (struct internal_event*)calloc(1,
|
|
sizeof(struct internal_event));
|
|
if(!c->ev) {
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
c->ev->base = base;
|
|
c->fd = fd;
|
|
c->buffer = NULL;
|
|
c->timeout = NULL;
|
|
c->tcp_is_reading = 0;
|
|
c->tcp_byte_count = 0;
|
|
c->tcp_parent = NULL;
|
|
c->max_tcp_count = num;
|
|
c->tcp_handlers = (struct comm_point**)calloc((size_t)num,
|
|
sizeof(struct comm_point*));
|
|
if(!c->tcp_handlers) {
|
|
free(c->ev);
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
c->tcp_free = NULL;
|
|
c->type = comm_tcp_accept;
|
|
c->tcp_do_close = 0;
|
|
c->do_not_close = 0;
|
|
c->tcp_do_toggle_rw = 0;
|
|
c->tcp_check_nb_connect = 0;
|
|
c->callback = NULL;
|
|
c->cb_arg = NULL;
|
|
evbits = EV_READ | EV_PERSIST;
|
|
/* libevent stuff */
|
|
event_set(&c->ev->ev, c->fd, evbits, comm_point_tcp_accept_callback, c);
|
|
if(event_base_set(base->eb->base, &c->ev->ev) != 0 ||
|
|
event_add(&c->ev->ev, c->timeout) != 0 )
|
|
{
|
|
log_err("could not add tcpacc event");
|
|
comm_point_delete(c);
|
|
return NULL;
|
|
}
|
|
|
|
/* now prealloc the tcp handlers */
|
|
for(i=0; i<num; i++) {
|
|
c->tcp_handlers[i] = comm_point_create_tcp_handler(base,
|
|
c, bufsize, callback, callback_arg);
|
|
if(!c->tcp_handlers[i]) {
|
|
comm_point_delete(c);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
struct comm_point*
|
|
comm_point_create_tcp_out(struct comm_base *base, size_t bufsize,
|
|
comm_point_callback_t* callback, void* callback_arg)
|
|
{
|
|
struct comm_point* c = (struct comm_point*)calloc(1,
|
|
sizeof(struct comm_point));
|
|
short evbits;
|
|
if(!c)
|
|
return NULL;
|
|
c->ev = (struct internal_event*)calloc(1,
|
|
sizeof(struct internal_event));
|
|
if(!c->ev) {
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
c->ev->base = base;
|
|
c->fd = -1;
|
|
c->buffer = sldns_buffer_new(bufsize);
|
|
if(!c->buffer) {
|
|
free(c->ev);
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
c->timeout = NULL;
|
|
c->tcp_is_reading = 0;
|
|
c->tcp_byte_count = 0;
|
|
c->tcp_parent = NULL;
|
|
c->max_tcp_count = 0;
|
|
c->tcp_handlers = NULL;
|
|
c->tcp_free = NULL;
|
|
c->type = comm_tcp;
|
|
c->tcp_do_close = 0;
|
|
c->do_not_close = 0;
|
|
c->tcp_do_toggle_rw = 1;
|
|
c->tcp_check_nb_connect = 1;
|
|
c->repinfo.c = c;
|
|
c->callback = callback;
|
|
c->cb_arg = callback_arg;
|
|
evbits = EV_PERSIST | EV_WRITE;
|
|
event_set(&c->ev->ev, c->fd, evbits, comm_point_tcp_handle_callback, c);
|
|
if(event_base_set(base->eb->base, &c->ev->ev) != 0)
|
|
{
|
|
log_err("could not basetset tcpout event");
|
|
sldns_buffer_free(c->buffer);
|
|
free(c->ev);
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
struct comm_point*
|
|
comm_point_create_local(struct comm_base *base, int fd, size_t bufsize,
|
|
comm_point_callback_t* callback, void* callback_arg)
|
|
{
|
|
struct comm_point* c = (struct comm_point*)calloc(1,
|
|
sizeof(struct comm_point));
|
|
short evbits;
|
|
if(!c)
|
|
return NULL;
|
|
c->ev = (struct internal_event*)calloc(1,
|
|
sizeof(struct internal_event));
|
|
if(!c->ev) {
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
c->ev->base = base;
|
|
c->fd = fd;
|
|
c->buffer = sldns_buffer_new(bufsize);
|
|
if(!c->buffer) {
|
|
free(c->ev);
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
c->timeout = NULL;
|
|
c->tcp_is_reading = 1;
|
|
c->tcp_byte_count = 0;
|
|
c->tcp_parent = NULL;
|
|
c->max_tcp_count = 0;
|
|
c->tcp_handlers = NULL;
|
|
c->tcp_free = NULL;
|
|
c->type = comm_local;
|
|
c->tcp_do_close = 0;
|
|
c->do_not_close = 1;
|
|
c->tcp_do_toggle_rw = 0;
|
|
c->tcp_check_nb_connect = 0;
|
|
c->callback = callback;
|
|
c->cb_arg = callback_arg;
|
|
/* libevent stuff */
|
|
evbits = EV_PERSIST | EV_READ;
|
|
event_set(&c->ev->ev, c->fd, evbits, comm_point_local_handle_callback,
|
|
c);
|
|
if(event_base_set(base->eb->base, &c->ev->ev) != 0 ||
|
|
event_add(&c->ev->ev, c->timeout) != 0 )
|
|
{
|
|
log_err("could not add localhdl event");
|
|
free(c->ev);
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
return c;
|
|
}
|
|
|
|
struct comm_point*
|
|
comm_point_create_raw(struct comm_base* base, int fd, int writing,
|
|
comm_point_callback_t* callback, void* callback_arg)
|
|
{
|
|
struct comm_point* c = (struct comm_point*)calloc(1,
|
|
sizeof(struct comm_point));
|
|
short evbits;
|
|
if(!c)
|
|
return NULL;
|
|
c->ev = (struct internal_event*)calloc(1,
|
|
sizeof(struct internal_event));
|
|
if(!c->ev) {
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
c->ev->base = base;
|
|
c->fd = fd;
|
|
c->buffer = NULL;
|
|
c->timeout = NULL;
|
|
c->tcp_is_reading = 0;
|
|
c->tcp_byte_count = 0;
|
|
c->tcp_parent = NULL;
|
|
c->max_tcp_count = 0;
|
|
c->tcp_handlers = NULL;
|
|
c->tcp_free = NULL;
|
|
c->type = comm_raw;
|
|
c->tcp_do_close = 0;
|
|
c->do_not_close = 1;
|
|
c->tcp_do_toggle_rw = 0;
|
|
c->tcp_check_nb_connect = 0;
|
|
c->callback = callback;
|
|
c->cb_arg = callback_arg;
|
|
/* libevent stuff */
|
|
if(writing)
|
|
evbits = EV_PERSIST | EV_WRITE;
|
|
else evbits = EV_PERSIST | EV_READ;
|
|
event_set(&c->ev->ev, c->fd, evbits, comm_point_raw_handle_callback,
|
|
c);
|
|
if(event_base_set(base->eb->base, &c->ev->ev) != 0 ||
|
|
event_add(&c->ev->ev, c->timeout) != 0 )
|
|
{
|
|
log_err("could not add rawhdl event");
|
|
free(c->ev);
|
|
free(c);
|
|
return NULL;
|
|
}
|
|
return c;
|
|
}
|
|
|
|
void
|
|
comm_point_close(struct comm_point* c)
|
|
{
|
|
if(!c)
|
|
return;
|
|
if(c->fd != -1)
|
|
if(event_del(&c->ev->ev) != 0) {
|
|
log_err("could not event_del on close");
|
|
}
|
|
/* close fd after removing from event lists, or epoll.. is messed up */
|
|
if(c->fd != -1 && !c->do_not_close) {
|
|
verbose(VERB_ALGO, "close fd %d", c->fd);
|
|
#ifndef USE_WINSOCK
|
|
close(c->fd);
|
|
#else
|
|
closesocket(c->fd);
|
|
#endif
|
|
}
|
|
c->fd = -1;
|
|
}
|
|
|
|
void
|
|
comm_point_delete(struct comm_point* c)
|
|
{
|
|
if(!c)
|
|
return;
|
|
if(c->type == comm_tcp && c->ssl) {
|
|
#ifdef HAVE_SSL
|
|
SSL_shutdown(c->ssl);
|
|
SSL_free(c->ssl);
|
|
#endif
|
|
}
|
|
comm_point_close(c);
|
|
if(c->tcp_handlers) {
|
|
int i;
|
|
for(i=0; i<c->max_tcp_count; i++)
|
|
comm_point_delete(c->tcp_handlers[i]);
|
|
free(c->tcp_handlers);
|
|
}
|
|
free(c->timeout);
|
|
if(c->type == comm_tcp || c->type == comm_local)
|
|
sldns_buffer_free(c->buffer);
|
|
free(c->ev);
|
|
free(c);
|
|
}
|
|
|
|
void
|
|
comm_point_send_reply(struct comm_reply *repinfo)
|
|
{
|
|
log_assert(repinfo && repinfo->c);
|
|
if(repinfo->c->type == comm_udp) {
|
|
if(repinfo->srctype)
|
|
comm_point_send_udp_msg_if(repinfo->c,
|
|
repinfo->c->buffer, (struct sockaddr*)&repinfo->addr,
|
|
repinfo->addrlen, repinfo);
|
|
else
|
|
comm_point_send_udp_msg(repinfo->c, repinfo->c->buffer,
|
|
(struct sockaddr*)&repinfo->addr, repinfo->addrlen);
|
|
#ifdef USE_DNSTAP
|
|
if(repinfo->c->dtenv != NULL &&
|
|
repinfo->c->dtenv->log_client_response_messages)
|
|
dt_msg_send_client_response(repinfo->c->dtenv,
|
|
&repinfo->addr, repinfo->c->type, repinfo->c->buffer);
|
|
#endif
|
|
} else {
|
|
#ifdef USE_DNSTAP
|
|
if(repinfo->c->tcp_parent->dtenv != NULL &&
|
|
repinfo->c->tcp_parent->dtenv->log_client_response_messages)
|
|
dt_msg_send_client_response(repinfo->c->tcp_parent->dtenv,
|
|
&repinfo->addr, repinfo->c->type, repinfo->c->buffer);
|
|
#endif
|
|
comm_point_start_listening(repinfo->c, -1, TCP_QUERY_TIMEOUT);
|
|
}
|
|
}
|
|
|
|
void
|
|
comm_point_drop_reply(struct comm_reply* repinfo)
|
|
{
|
|
if(!repinfo)
|
|
return;
|
|
log_assert(repinfo && repinfo->c);
|
|
log_assert(repinfo->c->type != comm_tcp_accept);
|
|
if(repinfo->c->type == comm_udp)
|
|
return;
|
|
reclaim_tcp_handler(repinfo->c);
|
|
}
|
|
|
|
void
|
|
comm_point_stop_listening(struct comm_point* c)
|
|
{
|
|
verbose(VERB_ALGO, "comm point stop listening %d", c->fd);
|
|
if(event_del(&c->ev->ev) != 0) {
|
|
log_err("event_del error to stoplisten");
|
|
}
|
|
}
|
|
|
|
void
|
|
comm_point_start_listening(struct comm_point* c, int newfd, int sec)
|
|
{
|
|
verbose(VERB_ALGO, "comm point start listening %d",
|
|
c->fd==-1?newfd:c->fd);
|
|
if(c->type == comm_tcp_accept && !c->tcp_free) {
|
|
/* no use to start listening no free slots. */
|
|
return;
|
|
}
|
|
if(sec != -1 && sec != 0) {
|
|
if(!c->timeout) {
|
|
c->timeout = (struct timeval*)malloc(sizeof(
|
|
struct timeval));
|
|
if(!c->timeout) {
|
|
log_err("cpsl: malloc failed. No net read.");
|
|
return;
|
|
}
|
|
}
|
|
c->ev->ev.ev_events |= EV_TIMEOUT;
|
|
#ifndef S_SPLINT_S /* splint fails on struct timeval. */
|
|
c->timeout->tv_sec = sec;
|
|
c->timeout->tv_usec = 0;
|
|
#endif /* S_SPLINT_S */
|
|
}
|
|
if(c->type == comm_tcp) {
|
|
c->ev->ev.ev_events &= ~(EV_READ|EV_WRITE);
|
|
if(c->tcp_is_reading)
|
|
c->ev->ev.ev_events |= EV_READ;
|
|
else c->ev->ev.ev_events |= EV_WRITE;
|
|
}
|
|
if(newfd != -1) {
|
|
if(c->fd != -1) {
|
|
#ifndef USE_WINSOCK
|
|
close(c->fd);
|
|
#else
|
|
closesocket(c->fd);
|
|
#endif
|
|
}
|
|
c->fd = newfd;
|
|
c->ev->ev.ev_fd = c->fd;
|
|
}
|
|
if(event_add(&c->ev->ev, sec==0?NULL:c->timeout) != 0) {
|
|
log_err("event_add failed. in cpsl.");
|
|
}
|
|
}
|
|
|
|
void comm_point_listen_for_rw(struct comm_point* c, int rd, int wr)
|
|
{
|
|
verbose(VERB_ALGO, "comm point listen_for_rw %d %d", c->fd, wr);
|
|
if(event_del(&c->ev->ev) != 0) {
|
|
log_err("event_del error to cplf");
|
|
}
|
|
c->ev->ev.ev_events &= ~(EV_READ|EV_WRITE);
|
|
if(rd) c->ev->ev.ev_events |= EV_READ;
|
|
if(wr) c->ev->ev.ev_events |= EV_WRITE;
|
|
if(event_add(&c->ev->ev, c->timeout) != 0) {
|
|
log_err("event_add failed. in cplf.");
|
|
}
|
|
}
|
|
|
|
size_t comm_point_get_mem(struct comm_point* c)
|
|
{
|
|
size_t s;
|
|
if(!c)
|
|
return 0;
|
|
s = sizeof(*c) + sizeof(*c->ev);
|
|
if(c->timeout)
|
|
s += sizeof(*c->timeout);
|
|
if(c->type == comm_tcp || c->type == comm_local)
|
|
s += sizeof(*c->buffer) + sldns_buffer_capacity(c->buffer);
|
|
if(c->type == comm_tcp_accept) {
|
|
int i;
|
|
for(i=0; i<c->max_tcp_count; i++)
|
|
s += comm_point_get_mem(c->tcp_handlers[i]);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
struct comm_timer*
|
|
comm_timer_create(struct comm_base* base, void (*cb)(void*), void* cb_arg)
|
|
{
|
|
struct comm_timer *tm = (struct comm_timer*)calloc(1,
|
|
sizeof(struct comm_timer));
|
|
if(!tm)
|
|
return NULL;
|
|
tm->ev_timer = (struct internal_timer*)calloc(1,
|
|
sizeof(struct internal_timer));
|
|
if(!tm->ev_timer) {
|
|
log_err("malloc failed");
|
|
free(tm);
|
|
return NULL;
|
|
}
|
|
tm->ev_timer->base = base;
|
|
tm->callback = cb;
|
|
tm->cb_arg = cb_arg;
|
|
event_set(&tm->ev_timer->ev, -1, EV_TIMEOUT,
|
|
comm_timer_callback, tm);
|
|
if(event_base_set(base->eb->base, &tm->ev_timer->ev) != 0) {
|
|
log_err("timer_create: event_base_set failed.");
|
|
free(tm->ev_timer);
|
|
free(tm);
|
|
return NULL;
|
|
}
|
|
return tm;
|
|
}
|
|
|
|
void
|
|
comm_timer_disable(struct comm_timer* timer)
|
|
{
|
|
if(!timer)
|
|
return;
|
|
evtimer_del(&timer->ev_timer->ev);
|
|
timer->ev_timer->enabled = 0;
|
|
}
|
|
|
|
void
|
|
comm_timer_set(struct comm_timer* timer, struct timeval* tv)
|
|
{
|
|
log_assert(tv);
|
|
if(timer->ev_timer->enabled)
|
|
comm_timer_disable(timer);
|
|
event_set(&timer->ev_timer->ev, -1, EV_TIMEOUT,
|
|
comm_timer_callback, timer);
|
|
if(event_base_set(timer->ev_timer->base->eb->base,
|
|
&timer->ev_timer->ev) != 0)
|
|
log_err("comm_timer_set: set_base failed.");
|
|
if(evtimer_add(&timer->ev_timer->ev, tv) != 0)
|
|
log_err("comm_timer_set: evtimer_add failed.");
|
|
timer->ev_timer->enabled = 1;
|
|
}
|
|
|
|
void
|
|
comm_timer_delete(struct comm_timer* timer)
|
|
{
|
|
if(!timer)
|
|
return;
|
|
comm_timer_disable(timer);
|
|
free(timer->ev_timer);
|
|
free(timer);
|
|
}
|
|
|
|
void
|
|
comm_timer_callback(int ATTR_UNUSED(fd), short event, void* arg)
|
|
{
|
|
struct comm_timer* tm = (struct comm_timer*)arg;
|
|
if(!(event&EV_TIMEOUT))
|
|
return;
|
|
comm_base_now(tm->ev_timer->base);
|
|
tm->ev_timer->enabled = 0;
|
|
fptr_ok(fptr_whitelist_comm_timer(tm->callback));
|
|
(*tm->callback)(tm->cb_arg);
|
|
}
|
|
|
|
int
|
|
comm_timer_is_set(struct comm_timer* timer)
|
|
{
|
|
return (int)timer->ev_timer->enabled;
|
|
}
|
|
|
|
size_t
|
|
comm_timer_get_mem(struct comm_timer* timer)
|
|
{
|
|
return sizeof(*timer) + sizeof(struct internal_timer);
|
|
}
|
|
|
|
struct comm_signal*
|
|
comm_signal_create(struct comm_base* base,
|
|
void (*callback)(int, void*), void* cb_arg)
|
|
{
|
|
struct comm_signal* com = (struct comm_signal*)malloc(
|
|
sizeof(struct comm_signal));
|
|
if(!com) {
|
|
log_err("malloc failed");
|
|
return NULL;
|
|
}
|
|
com->base = base;
|
|
com->callback = callback;
|
|
com->cb_arg = cb_arg;
|
|
com->ev_signal = NULL;
|
|
return com;
|
|
}
|
|
|
|
void
|
|
comm_signal_callback(int sig, short event, void* arg)
|
|
{
|
|
struct comm_signal* comsig = (struct comm_signal*)arg;
|
|
if(!(event & EV_SIGNAL))
|
|
return;
|
|
comm_base_now(comsig->base);
|
|
fptr_ok(fptr_whitelist_comm_signal(comsig->callback));
|
|
(*comsig->callback)(sig, comsig->cb_arg);
|
|
}
|
|
|
|
int
|
|
comm_signal_bind(struct comm_signal* comsig, int sig)
|
|
{
|
|
struct internal_signal* entry = (struct internal_signal*)calloc(1,
|
|
sizeof(struct internal_signal));
|
|
if(!entry) {
|
|
log_err("malloc failed");
|
|
return 0;
|
|
}
|
|
log_assert(comsig);
|
|
/* add signal event */
|
|
signal_set(&entry->ev, sig, comm_signal_callback, comsig);
|
|
if(event_base_set(comsig->base->eb->base, &entry->ev) != 0) {
|
|
log_err("Could not set signal base");
|
|
free(entry);
|
|
return 0;
|
|
}
|
|
if(signal_add(&entry->ev, NULL) != 0) {
|
|
log_err("Could not add signal handler");
|
|
free(entry);
|
|
return 0;
|
|
}
|
|
/* link into list */
|
|
entry->next = comsig->ev_signal;
|
|
comsig->ev_signal = entry;
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
comm_signal_delete(struct comm_signal* comsig)
|
|
{
|
|
struct internal_signal* p, *np;
|
|
if(!comsig)
|
|
return;
|
|
p=comsig->ev_signal;
|
|
while(p) {
|
|
np = p->next;
|
|
signal_del(&p->ev);
|
|
free(p);
|
|
p = np;
|
|
}
|
|
free(comsig);
|
|
}
|