133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/*
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* Copyright (c) 2014 Mike Belopuhov
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*
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* ASR implementation and OpenSMTPD integration are copyright
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* Copyright (c) 2008 Gilles Chehade <gilles@poolp.org>
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* Copyright (c) 2009 Jacek Masiulaniec <jacekm@dobremiasto.net>
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* Copyright (c) 2011-2012 Eric Faurot <eric@faurot.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER IN
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* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <errno.h>
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#include <event.h>
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#include <resolv.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <asr.h>
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#include "icb.h"
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#include "icbd.h"
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struct async_event;
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struct async_event *async_run_event(struct asr_query *,
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void (*)(struct asr_result *, void *), void *);
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void dns_done(struct asr_result *, void *);
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extern int dodns;
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void
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dns_done(struct asr_result *ar, void *arg)
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{
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struct icb_session *is = arg;
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if (ar->ar_gai_errno == 0) {
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icbd_log(is, LOG_DEBUG, "dns resolved %s to %s", is->host,
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is->hostname);
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if (strncmp(is->hostname, "localhost",
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sizeof "localhost" - 1) == 0)
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strlcpy(is->host, "unknown", ICB_MAXHOSTLEN);
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else if (strlen(is->hostname) < ICB_MAXHOSTLEN)
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strlcpy(is->host, is->hostname, ICB_MAXHOSTLEN);
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} else
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icbd_log(is, LOG_WARNING, "dns resolution failed: %s",
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gai_strerror(ar->ar_gai_errno));
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}
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void
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dns_rresolv(struct icb_session *is, struct sockaddr *sa)
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{
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struct asr_query *as;
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if (!dodns)
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return;
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if (verbose)
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icbd_log(is, LOG_DEBUG, "resolving: %s", is->host);
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as = getnameinfo_async(sa, sa->sa_len, is->hostname,
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sizeof is->hostname, NULL, 0, NI_NOFQDN, NULL);
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async_run_event(as, dns_done, is);
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}
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/* Generic libevent glue for asr */
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struct async_event {
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struct asr_query *async;
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struct event ev;
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void (*callback)(struct asr_result *, void *);
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void *arg;
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};
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void async_event_dispatch(int, short, void *);
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struct async_event *
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async_run_event(struct asr_query *async,
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void (*cb)(struct asr_result *, void *), void *arg)
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{
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struct async_event *aev;
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struct timeval tv;
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aev = calloc(1, sizeof *aev);
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if (aev == NULL)
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return (NULL);
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aev->async = async;
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aev->callback = cb;
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aev->arg = arg;
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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evtimer_set(&aev->ev, async_event_dispatch, aev);
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evtimer_add(&aev->ev, &tv);
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return (aev);
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}
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void
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async_event_dispatch(int fd __attribute__((__unused__)),
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short ev __attribute__((__unused__)), void *arg)
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{
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struct async_event *aev = arg;
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struct asr_result ar;
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struct timeval tv;
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event_del(&aev->ev);
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if (asr_run(aev->async, &ar) == 0) {
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event_set(&aev->ev, ar.ar_fd,
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ar.ar_cond == ASR_WANT_READ ? EV_READ : EV_WRITE,
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async_event_dispatch, aev);
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tv.tv_sec = ar.ar_timeout / 1000;
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tv.tv_usec = (ar.ar_timeout % 1000) * 1000;
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event_add(&aev->ev, &tv);
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} else { /* done */
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aev->callback(&ar, aev->arg);
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free(aev);
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}
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}
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