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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/smtpd/smtpd/../bounce.c	Lines:	0	374	0.0 %
Date:	2017-11-13	Branches:	0	220	0.0 %


/*	$OpenBSD: bounce.c,v 1.77 2016/11/30 11:52:48 eric Exp $	*/

/*
 * Copyright (c) 2009 Gilles Chehade <gilles@poolp.org>
 * Copyright (c) 2009 Jacek Masiulaniec <jacekm@dobremiasto.net>
 * Copyright (c) 2012 Eric Faurot <eric@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/socket.h>

#include <err.h>
#include <errno.h>
#include <event.h>
#include <imsg.h>
#include <inttypes.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <limits.h>

#include "smtpd.h"
#include "log.h"

#define BOUNCE_MAXRUN	2
#define BOUNCE_HIWAT	65535

enum {
	BOUNCE_EHLO,
	BOUNCE_MAIL,
	BOUNCE_RCPT,
	BOUNCE_DATA,
	BOUNCE_DATA_NOTICE,
	BOUNCE_DATA_MESSAGE,
	BOUNCE_DATA_END,
	BOUNCE_QUIT,
	BOUNCE_CLOSE,
};

struct bounce_envelope {
	TAILQ_ENTRY(bounce_envelope)	 entry;
	uint64_t			 id;
	struct mailaddr			 dest;
	char				*report;
	uint8_t				 esc_class;
	uint8_t				 esc_code;
};

struct bounce_message {
	SPLAY_ENTRY(bounce_message)	 sp_entry;
	TAILQ_ENTRY(bounce_message)	 entry;
	uint32_t			 msgid;
	struct delivery_bounce		 bounce;
	char				*smtpname;
	char				*to;
	time_t				 timeout;
	TAILQ_HEAD(, bounce_envelope)	 envelopes;
};

struct bounce_session {
	char				*smtpname;
	struct bounce_message		*msg;
	FILE				*msgfp;
	int				 state;
	struct io			*io;
	uint64_t			 boundary;
};

SPLAY_HEAD(bounce_message_tree, bounce_message);
static int bounce_message_cmp(const struct bounce_message *,
    const struct bounce_message *);
SPLAY_PROTOTYPE(bounce_message_tree, bounce_message, sp_entry,
    bounce_message_cmp);

static void bounce_drain(void);
static void bounce_send(struct bounce_session *, const char *, ...);
static int  bounce_next_message(struct bounce_session *);
static int  bounce_next(struct bounce_session *);
static void bounce_delivery(struct bounce_message *, int, const char *);
static void bounce_status(struct bounce_session *, const char *, ...);
static void bounce_io(struct io *, int, void *);
static void bounce_timeout(int, short, void *);
static void bounce_free(struct bounce_session *);
static const char *action_str(const struct delivery_bounce *);

static struct tree			wait_fd;
static struct bounce_message_tree	messages;
static TAILQ_HEAD(, bounce_message)	pending;

static int				nmessage = 0;
static int				running = 0;
static struct event			ev_timer;

static void
bounce_init(void)
{
	static int	init = 0;

	if (init == 0) {
		TAILQ_INIT(&pending);
		SPLAY_INIT(&messages);
		tree_init(&wait_fd);
		evtimer_set(&ev_timer, bounce_timeout, NULL);
		init = 1;
	}
}

void
bounce_add(uint64_t evpid)
{
	char			 buf[LINE_MAX], *line;
	struct envelope		 evp;
	struct bounce_message	 key, *msg;
	struct bounce_envelope	*be;

	bounce_init();

	if (queue_envelope_load(evpid, &evp) == 0) {
		m_create(p_scheduler, IMSG_QUEUE_DELIVERY_PERMFAIL, 0, 0, -1);
		m_add_evpid(p_scheduler, evpid);
		m_close(p_scheduler);
		return;
	}

	if (evp.type != D_BOUNCE)
		errx(1, "bounce: evp:%016" PRIx64 " is not of type D_BOUNCE!",
		    evp.id);

	key.msgid = evpid_to_msgid(evpid);
	key.bounce = evp.agent.bounce;
	key.smtpname = evp.smtpname;

	switch (evp.esc_class) {
	case ESC_STATUS_OK:
		key.bounce.type = B_DSN;
		break;
	case ESC_STATUS_TEMPFAIL:
		key.bounce.type = B_WARNING;
		break;
	default:
		key.bounce.type = B_ERROR;
	}

	key.bounce.dsn_ret = evp.dsn_ret;
	key.bounce.expire = evp.expire;
	msg = SPLAY_FIND(bounce_message_tree, &messages, &key);
	if (msg == NULL) {
		msg = xcalloc(1, sizeof(*msg), "bounce_add");
		msg->msgid = key.msgid;
		msg->bounce = key.bounce;

		TAILQ_INIT(&msg->envelopes);

		msg->smtpname = xstrdup(evp.smtpname, "bounce_add");
		(void)snprintf(buf, sizeof(buf), "%s@%s", evp.sender.user,
		    evp.sender.domain);
		msg->to = xstrdup(buf, "bounce_add");
		nmessage += 1;
		SPLAY_INSERT(bounce_message_tree, &messages, msg);
		log_debug("debug: bounce: new message %08" PRIx32,
		    msg->msgid);
		stat_increment("bounce.message", 1);
	} else
		TAILQ_REMOVE(&pending, msg, entry);

	line = evp.errorline;
	if (strlen(line) > 4 && (*line == '1' || *line == '6'))
		line += 4;
	(void)snprintf(buf, sizeof(buf), "%s@%s: %s\n", evp.dest.user,
	    evp.dest.domain, line);

	be = xmalloc(sizeof *be, "bounce_add");
	be->id = evpid;
	be->report = xstrdup(buf, "bounce_add");
	(void)strlcpy(be->dest.user, evp.dest.user, sizeof(be->dest.user));
	(void)strlcpy(be->dest.domain, evp.dest.domain,
	    sizeof(be->dest.domain));
	be->esc_class = evp.esc_class;
	be->esc_code = evp.esc_code;
	TAILQ_INSERT_TAIL(&msg->envelopes, be, entry);
	buf[strcspn(buf, "\n")] = '\0';
	log_debug("debug: bounce: adding report %16"PRIx64": %s", be->id, buf);

	msg->timeout = time(NULL) + 1;
	TAILQ_INSERT_TAIL(&pending, msg, entry);

	stat_increment("bounce.envelope", 1);
	bounce_drain();
}

void
bounce_fd(int fd)
{
	struct bounce_session	*s;
	struct bounce_message	*msg;

	log_debug("debug: bounce: got enqueue socket %d", fd);

	if (fd == -1 || TAILQ_EMPTY(&pending)) {
		log_debug("debug: bounce: cancelling");
		if (fd != -1)
			close(fd);
		running -= 1;
		bounce_drain();
		return;
	}

	msg = TAILQ_FIRST(&pending);

	s = xcalloc(1, sizeof(*s), "bounce_fd");
	s->smtpname = xstrdup(msg->smtpname, "bounce_fd");
	s->state = BOUNCE_EHLO;
	s->io = io_new();
	io_set_callback(s->io, bounce_io, s);
	io_set_fd(s->io, fd);
	io_set_timeout(s->io, 30000);
	io_set_read(s->io);
	s->boundary = generate_uid();

	log_debug("debug: bounce: new session %p", s);
	stat_increment("bounce.session", 1);
}

static void
bounce_timeout(int fd, short ev, void *arg)
{
	log_debug("debug: bounce: timeout");

	bounce_drain();
}

static void
bounce_drain()
{
	struct bounce_message	*msg;
	struct timeval		 tv;
	time_t			 t;

	log_debug("debug: bounce: drain: nmessage=%d running=%d",
	    nmessage, running);

	while (1) {
		if (running >= BOUNCE_MAXRUN) {
			log_debug("debug: bounce: max session reached");
			return;
		}

		if (nmessage == 0) {
			log_debug("debug: bounce: no more messages");
			return;
		}

		if (running >= nmessage) {
			log_debug("debug: bounce: enough sessions running");
			return;
		}

		if ((msg = TAILQ_FIRST(&pending)) == NULL) {
			log_debug("debug: bounce: no more pending messages");
			return;
		}

		t = time(NULL);
		if (msg->timeout > t) {
			log_debug("debug: bounce: next message not ready yet");
			if (!evtimer_pending(&ev_timer, NULL)) {
				log_debug("debug: bounce: setting timer");
				tv.tv_sec = msg->timeout - t;
				tv.tv_usec = 0;
				evtimer_add(&ev_timer, &tv);
			}
			return;
		}

		log_debug("debug: bounce: requesting new enqueue socket...");
		m_compose(p_pony, IMSG_QUEUE_SMTP_SESSION, 0, 0, -1, NULL, 0);

		running += 1;
	}
}

static void
bounce_send(struct bounce_session *s, const char *fmt, ...)
{
	va_list	 ap;
	char	*p;
	int	 len;

	va_start(ap, fmt);
	if ((len = vasprintf(&p, fmt, ap)) == -1)
		fatal("bounce: vasprintf");
	va_end(ap);

	log_trace(TRACE_BOUNCE, "bounce: %p: >>> %s", s, p);

	io_xprintf(s->io, "%s\n", p);

	free(p);
}

static const char *
bounce_duration(long long int d)
{
	static char buf[32];

	if (d < 60) {
		(void)snprintf(buf, sizeof buf, "%lld second%s", d,
		    (d == 1) ? "" : "s");
	} else if (d < 3600) {
		d = d / 60;
		(void)snprintf(buf, sizeof buf, "%lld minute%s", d,
		    (d == 1) ? "" : "s");
	}
	else if (d < 3600 * 24) {
		d = d / 3600;
		(void)snprintf(buf, sizeof buf, "%lld hour%s", d,
		    (d == 1) ? "" : "s");
	}
	else {
		d = d / (3600 * 24);
		(void)snprintf(buf, sizeof buf, "%lld day%s", d,
		    (d == 1) ? "" : "s");
	}
	return (buf);
}

#define NOTICE_INTRO							    \
	"    Hi!\n\n"							    \
	"    This is the MAILER-DAEMON, please DO NOT REPLY to this email.\n"

const char *notice_error =
    "    An error has occurred while attempting to deliver a message for\n"
    "    the following list of recipients:\n\n";

const char *notice_warning =
    "    A message is delayed for more than %s for the following\n"
    "    list of recipients:\n\n";

const char *notice_warning2 =
    "    Please note that this is only a temporary failure report.\n"
    "    The message is kept in the queue for up to %s.\n"
    "    You DO NOT NEED to re-send the message to these recipients.\n\n";

const char *notice_success =
    "    Your message was successfully delivered to these recipients.\n\n";

const char *notice_relay =
    "    Your message was relayed to these recipients.\n\n";

static int
bounce_next_message(struct bounce_session *s)
{
	struct bounce_message	*msg;
	char			 buf[LINE_MAX];
	int			 fd;
	time_t			 now;

    again:

	now = time(NULL);

	TAILQ_FOREACH(msg, &pending, entry) {
		if (msg->timeout > now)
			continue;
		if (strcmp(msg->smtpname, s->smtpname))
			continue;
		break;
	}
	if (msg == NULL)
		return (0);

	TAILQ_REMOVE(&pending, msg, entry);
	SPLAY_REMOVE(bounce_message_tree, &messages, msg);

	if ((fd = queue_message_fd_r(msg->msgid)) == -1) {
		bounce_delivery(msg, IMSG_QUEUE_DELIVERY_TEMPFAIL,
		    "Could not open message fd");
		goto again;
	}

	if ((s->msgfp = fdopen(fd, "r")) == NULL) {
		(void)snprintf(buf, sizeof(buf), "fdopen: %s", strerror(errno));
		log_warn("warn: bounce: fdopen");
		close(fd);
		bounce_delivery(msg, IMSG_QUEUE_DELIVERY_TEMPFAIL, buf);
		goto again;
	}

	s->msg = msg;
	return (1);
}

static int
bounce_next(struct bounce_session *s)
{
	struct bounce_envelope	*evp;
	char			*line = NULL;
	size_t			 n, sz = 0;
	ssize_t			 len;

	switch (s->state) {
	case BOUNCE_EHLO:
		bounce_send(s, "EHLO %s", s->smtpname);
		s->state = BOUNCE_MAIL;
		break;

	case BOUNCE_MAIL:
	case BOUNCE_DATA_END:
		log_debug("debug: bounce: %p: getting next message...", s);
		if (bounce_next_message(s) == 0) {
			log_debug("debug: bounce: %p: no more messages", s);
			bounce_send(s, "QUIT");
			s->state = BOUNCE_CLOSE;
			break;
		}
		log_debug("debug: bounce: %p: found message %08"PRIx32,
		    s, s->msg->msgid);
		bounce_send(s, "MAIL FROM: <>");
		s->state = BOUNCE_RCPT;
		break;

	case BOUNCE_RCPT:
		bounce_send(s, "RCPT TO: <%s>", s->msg->to);
		s->state = BOUNCE_DATA;
		break;

	case BOUNCE_DATA:
		bounce_send(s, "DATA");
		s->state = BOUNCE_DATA_NOTICE;
		break;

	case BOUNCE_DATA_NOTICE:
		/* Construct an appropriate notice. */

		io_xprintf(s->io,
		    "Subject: Delivery status notification: %s\n"
		    "From: Mailer Daemon <MAILER-DAEMON@%s>\n"
		    "To: %s\n"
		    "Date: %s\n"
		    "MIME-Version: 1.0\n"
		    "Content-Type: multipart/mixed;"
		    "boundary=\"%16" PRIu64 "/%s\"\n"
		    "\n"
		    "This is a MIME-encapsulated message.\n"
		    "\n",
		    action_str(&s->msg->bounce),
		    s->smtpname,
		    s->msg->to,
		    time_to_text(time(NULL)),
		    s->boundary,
		    s->smtpname);

		io_xprintf(s->io,
		    "--%16" PRIu64 "/%s\n"
		    "Content-Description: Notification\n"
		    "Content-Type: text/plain; charset=us-ascii\n"
		    "\n"
		    NOTICE_INTRO
		    "\n",
		    s->boundary, s->smtpname);

		switch (s->msg->bounce.type) {
		case B_ERROR:
			io_xprint(s->io, notice_error);
			break;
		case B_WARNING:
			io_xprintf(s->io, notice_warning,
			    bounce_duration(s->msg->bounce.delay));
			break;
		case B_DSN:
			io_xprint(s->io, s->msg->bounce.mta_without_dsn ?
			    notice_relay : notice_success);
			break;
		default:
			log_warn("warn: bounce: unknown bounce_type");
		}

		TAILQ_FOREACH(evp, &s->msg->envelopes, entry) {
			io_xprint(s->io, evp->report);
		}
		io_xprint(s->io, "\n");

		if (s->msg->bounce.type == B_WARNING)
			io_xprintf(s->io, notice_warning2,
			    bounce_duration(s->msg->bounce.expire));

		io_xprintf(s->io,
		    "    Below is a copy of the original message:\n"
		    "\n");

		io_xprintf(s->io,
		    "--%16" PRIu64 "/%s\n"
		    "Content-Description: Delivery Report\n"
		    "Content-Type: message/delivery-status\n"
		    "\n",
		    s->boundary, s->smtpname);

		io_xprintf(s->io,
		    "Reporting-MTA: dns; %s\n"
		    "\n",
		    s->smtpname);

		TAILQ_FOREACH(evp, &s->msg->envelopes, entry) {
			io_xprintf(s->io,
			    "Final-Recipient: rfc822; %s@%s\n"
			    "Action: %s\n"
			    "Status: %s\n"
			    "\n",
			    evp->dest.user,
			    evp->dest.domain,
			    action_str(&s->msg->bounce),
			    esc_code(evp->esc_class, evp->esc_code));
		}

		log_trace(TRACE_BOUNCE, "bounce: %p: >>> [... %zu bytes ...]",
		    s, io_queued(s->io));

		s->state = BOUNCE_DATA_MESSAGE;
		break;

	case BOUNCE_DATA_MESSAGE:
		io_xprintf(s->io,
		    "--%16" PRIu64 "/%s\n"
		    "Content-Description: Message headers\n"
		    "Content-Type: text/rfc822-headers\n"
		    "\n",
		    s->boundary, s->smtpname);

		n = io_queued(s->io);
		while (io_queued(s->io) < BOUNCE_HIWAT) {
			if ((len = getline(&line, &sz, s->msgfp)) == -1)
				break;
			if (len == 1 && line[0] == '\n' && /* end of headers */
			    s->msg->bounce.type == B_DSN &&
			    s->msg->bounce.dsn_ret ==  DSN_RETHDRS) {
				free(line);
				fclose(s->msgfp);
				s->msgfp = NULL;
				io_xprintf(s->io,
				    "\n--%16" PRIu64 "/%s--\n", s->boundary,
				    s->smtpname);
				bounce_send(s, ".");
				s->state = BOUNCE_DATA_END;
				return (0);
			}
			line[len - 1] = '\0';
			io_xprintf(s->io, "%s%s\n",
			    (len == 2 && line[0] == '.') ? "." : "", line);
		}
		free(line);

		if (ferror(s->msgfp)) {
			fclose(s->msgfp);
			s->msgfp = NULL;
			bounce_delivery(s->msg, IMSG_QUEUE_DELIVERY_TEMPFAIL,
			    "Error reading message");
			s->msg = NULL;
			return (-1);
		}

		io_xprintf(s->io,
		    "\n--%16" PRIu64 "/%s--\n", s->boundary, s->smtpname);

		log_trace(TRACE_BOUNCE, "bounce: %p: >>> [... %zu bytes ...]",
		    s, io_queued(s->io) - n);

		if (feof(s->msgfp)) {
			fclose(s->msgfp);
			s->msgfp = NULL;
			bounce_send(s, ".");
			s->state = BOUNCE_DATA_END;
		}
		break;

	case BOUNCE_QUIT:
		bounce_send(s, "QUIT");
		s->state = BOUNCE_CLOSE;
		break;

	default:
		fatalx("bounce: bad state");
	}

	return (0);
}


static void
bounce_delivery(struct bounce_message *msg, int delivery, const char *status)
{
	struct bounce_envelope	*be;
	struct envelope		 evp;
	size_t			 n;
	const char		*f;

	n = 0;
	while ((be = TAILQ_FIRST(&msg->envelopes))) {
		if (delivery == IMSG_QUEUE_DELIVERY_TEMPFAIL) {
			if (queue_envelope_load(be->id, &evp) == 0) {
				fatalx("could not reload envelope!");
			}
			evp.retry++;
			evp.lasttry = msg->timeout;
			envelope_set_errormsg(&evp, "%s", status);
			queue_envelope_update(&evp);
			m_create(p_scheduler, delivery, 0, 0, -1);
			m_add_envelope(p_scheduler, &evp);
			m_close(p_scheduler);
		} else {
			m_create(p_scheduler, delivery, 0, 0, -1);
			m_add_evpid(p_scheduler, be->id);
			m_close(p_scheduler);
			queue_envelope_delete(be->id);
		}
		TAILQ_REMOVE(&msg->envelopes, be, entry);
		free(be->report);
		free(be);
		n += 1;
	}


	if (delivery == IMSG_QUEUE_DELIVERY_TEMPFAIL)
		f = "TempFail";
	else if (delivery == IMSG_QUEUE_DELIVERY_PERMFAIL)
		f = "PermFail";
	else
		f = NULL;

	if (f)
		log_warnx("warn: %s injecting failure report on message %08"
		    PRIx32 " to <%s> for %zu envelope%s: %s",
		    f, msg->msgid, msg->to, n, n > 1 ? "s":"", status);

	nmessage -= 1;
	stat_decrement("bounce.message", 1);
	stat_decrement("bounce.envelope", n);
	free(msg->smtpname);
	free(msg->to);
	free(msg);
}

static void
bounce_status(struct bounce_session *s, const char *fmt, ...)
{
	va_list		 ap;
	char		*status;
	int		 len, delivery;

	/* Ignore if there is no message */
	if (s->msg == NULL)
		return;

	va_start(ap, fmt);
	if ((len = vasprintf(&status, fmt, ap)) == -1)
		fatal("bounce: vasprintf");
	va_end(ap);

	if (*status == '2')
		delivery = IMSG_QUEUE_DELIVERY_OK;
	else if (*status == '5' || *status == '6')
		delivery = IMSG_QUEUE_DELIVERY_PERMFAIL;
	else
		delivery = IMSG_QUEUE_DELIVERY_TEMPFAIL;

	bounce_delivery(s->msg, delivery, status);
	s->msg = NULL;
	if (s->msgfp)
		fclose(s->msgfp);

	free(status);
}

static void
bounce_free(struct bounce_session *s)
{
	log_debug("debug: bounce: %p: deleting session", s);

	io_free(s->io);

	free(s->smtpname);
	free(s);

	running -= 1;
	stat_decrement("bounce.session", 1);
	bounce_drain();
}

static void
bounce_io(struct io *io, int evt, void *arg)
{
	struct bounce_session	*s = arg;
	const char		*error;
	char			*line, *msg;
	int			 cont;
	size_t			 len;

	log_trace(TRACE_IO, "bounce: %p: %s %s", s, io_strevent(evt),
	    io_strio(io));

	switch (evt) {
	case IO_DATAIN:
	    nextline:
		line = io_getline(s->io, &len);
		if (line == NULL && io_datalen(s->io) >= LINE_MAX) {
			bounce_status(s, "Input too long");
			bounce_free(s);
			return;
		}

		if (line == NULL)
			break;

		log_trace(TRACE_BOUNCE, "bounce: %p: <<< %s", s, line);

		if ((error = parse_smtp_response(line, len, &msg, &cont))) {
			bounce_status(s, "Bad response: %s", error);
			bounce_free(s);
			return;
		}
		if (cont)
			goto nextline;

		if (s->state == BOUNCE_CLOSE) {
			bounce_free(s);
			return;
		}

		if (line[0] != '2' && line[0] != '3') {		/* fail */
			bounce_status(s, "%s", line);
			s->state = BOUNCE_QUIT;
		} else if (s->state == BOUNCE_DATA_END) {	/* accepted */
			bounce_status(s, "%s", line);
		}

		if (bounce_next(s) == -1) {
			bounce_free(s);
			return;
		}

		io_set_write(io);
		break;

	case IO_LOWAT:
		if (s->state == BOUNCE_DATA_MESSAGE)
			if (bounce_next(s) == -1) {
				bounce_free(s);
				return;
			}
		if (io_queued(s->io) == 0)
			io_set_read(io);
		break;

	default:
		bounce_status(s, "442 i/o error %d", evt);
		bounce_free(s);
		break;
	}
}

static int
bounce_message_cmp(const struct bounce_message *a,
    const struct bounce_message *b)
{
	int r;

	if (a->msgid < b->msgid)
		return (-1);
	if (a->msgid > b->msgid)
		return (1);
	if ((r = strcmp(a->smtpname, b->smtpname)))
		return (r);

	return memcmp(&a->bounce, &b->bounce, sizeof (a->bounce));
}

static const char *
action_str(const struct delivery_bounce *b)
{
	switch (b->type) {
	case B_ERROR:
		return ("error");
	case B_WARNING:
		return ("delayed");
	case B_DSN:
		if (b->mta_without_dsn)
			return ("relayed");

		return ("success");
	default:
		log_warn("warn: bounce: unknown bounce_type");
		return ("");
	}
}

SPLAY_GENERATE(bounce_message_tree, bounce_message, sp_entry,
    bounce_message_cmp);


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: bounce.c,v 1.77 2016/11/30 11:52:48 eric Exp $ */
2
3			/*
4			* Copyright (c) 2009 Gilles Chehade <gilles@poolp.org>
5			* Copyright (c) 2009 Jacek Masiulaniec <jacekm@dobremiasto.net>
6			* Copyright (c) 2012 Eric Faurot <eric@openbsd.org>
7			*
8			* Permission to use, copy, modify, and distribute this software for any
9			* purpose with or without fee is hereby granted, provided that the above
10			* copyright notice and this permission notice appear in all copies.
11			*
12			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19			*/
20
21			#include <sys/types.h>
22			#include <sys/queue.h>
23			#include <sys/tree.h>
24			#include <sys/socket.h>
25
26			#include <err.h>
27			#include <errno.h>
28			#include <event.h>
29			#include <imsg.h>
30			#include <inttypes.h>
31			#include <pwd.h>
32			#include <signal.h>
33			#include <stdio.h>
34			#include <stdlib.h>
35			#include <string.h>
36			#include <time.h>
37			#include <unistd.h>
38			#include <limits.h>
39
40			#include "smtpd.h"
41			#include "log.h"
42
43			#define BOUNCE_MAXRUN 2
44			#define BOUNCE_HIWAT 65535
45
46			enum {
47			BOUNCE_EHLO,
48			BOUNCE_MAIL,
49			BOUNCE_RCPT,
50			BOUNCE_DATA,
51			BOUNCE_DATA_NOTICE,
52			BOUNCE_DATA_MESSAGE,
53			BOUNCE_DATA_END,
54			BOUNCE_QUIT,
55			BOUNCE_CLOSE,
56			};
57
58			struct bounce_envelope {
59			TAILQ_ENTRY(bounce_envelope) entry;
60			uint64_t id;
61			struct mailaddr dest;
62			char *report;
63			uint8_t esc_class;
64			uint8_t esc_code;
65			};
66
67			struct bounce_message {
68			SPLAY_ENTRY(bounce_message) sp_entry;
69			TAILQ_ENTRY(bounce_message) entry;
70			uint32_t msgid;
71			struct delivery_bounce bounce;
72			char *smtpname;
73			char *to;
74			time_t timeout;
75			TAILQ_HEAD(, bounce_envelope) envelopes;
76			};
77
78			struct bounce_session {
79			char *smtpname;
80			struct bounce_message *msg;
81			FILE *msgfp;
82			int state;
83			struct io *io;
84			uint64_t boundary;
85			};
86
87			SPLAY_HEAD(bounce_message_tree, bounce_message);
88			static int bounce_message_cmp(const struct bounce_message *,
89			const struct bounce_message *);
90			SPLAY_PROTOTYPE(bounce_message_tree, bounce_message, sp_entry,
91			bounce_message_cmp);
92
93			static void bounce_drain(void);
94			static void bounce_send(struct bounce_session , const char , ...);
95			static int bounce_next_message(struct bounce_session *);
96			static int bounce_next(struct bounce_session *);
97			static void bounce_delivery(struct bounce_message , int, const char );
98			static void bounce_status(struct bounce_session , const char , ...);
99			static void bounce_io(struct io , int, void );
100			static void bounce_timeout(int, short, void *);
101			static void bounce_free(struct bounce_session *);
102			static const char action_str(const struct delivery_bounce );
103
104			static struct tree wait_fd;
105			static struct bounce_message_tree messages;
106			static TAILQ_HEAD(, bounce_message) pending;
107
108			static int nmessage = 0;
109			static int running = 0;
110			static struct event ev_timer;
111
112			static void
113			bounce_init(void)
114			{
115			static int init = 0;
116
117			if (init == 0) {
118			TAILQ_INIT(&pending);
119			SPLAY_INIT(&messages);
120			tree_init(&wait_fd);
121			evtimer_set(&ev_timer, bounce_timeout, NULL);
122			init = 1;
123			}
124			}
125
126			void
127			bounce_add(uint64_t evpid)
128			{
129			char buf[LINE_MAX], *line;
130			struct envelope evp;
131			struct bounce_message key, *msg;
132			struct bounce_envelope *be;
133
134			bounce_init();
135
136			if (queue_envelope_load(evpid, &evp) == 0) {
137			m_create(p_scheduler, IMSG_QUEUE_DELIVERY_PERMFAIL, 0, 0, -1);
138			m_add_evpid(p_scheduler, evpid);
139			m_close(p_scheduler);
140			return;
141			}
142
143			if (evp.type != D_BOUNCE)
144			errx(1, "bounce: evp:%016" PRIx64 " is not of type D_BOUNCE!",
145			evp.id);
146
147			key.msgid = evpid_to_msgid(evpid);
148			key.bounce = evp.agent.bounce;
149			key.smtpname = evp.smtpname;
150
151			switch (evp.esc_class) {
152			case ESC_STATUS_OK:
153			key.bounce.type = B_DSN;
154			break;
155			case ESC_STATUS_TEMPFAIL:
156			key.bounce.type = B_WARNING;
157			break;
158			default:
159			key.bounce.type = B_ERROR;
160			}
161
162			key.bounce.dsn_ret = evp.dsn_ret;
163			key.bounce.expire = evp.expire;
164			msg = SPLAY_FIND(bounce_message_tree, &messages, &key);
165			if (msg == NULL) {
166			msg = xcalloc(1, sizeof(*msg), "bounce_add");
167			msg->msgid = key.msgid;
168			msg->bounce = key.bounce;
169
170			TAILQ_INIT(&msg->envelopes);
171
172			msg->smtpname = xstrdup(evp.smtpname, "bounce_add");
173			(void)snprintf(buf, sizeof(buf), "%s@%s", evp.sender.user,
174			evp.sender.domain);
175			msg->to = xstrdup(buf, "bounce_add");
176			nmessage += 1;
177			SPLAY_INSERT(bounce_message_tree, &messages, msg);
178			log_debug("debug: bounce: new message %08" PRIx32,
179			msg->msgid);
180			stat_increment("bounce.message", 1);
181			} else
182			TAILQ_REMOVE(&pending, msg, entry);
183
184			line = evp.errorline;
185			if (strlen(line) > 4 && (line == '1' \|\| line == '6'))
186			line += 4;
187			(void)snprintf(buf, sizeof(buf), "%s@%s: %s\n", evp.dest.user,
188			evp.dest.domain, line);
189
190			be = xmalloc(sizeof *be, "bounce_add");
191			be->id = evpid;
192			be->report = xstrdup(buf, "bounce_add");
193			(void)strlcpy(be->dest.user, evp.dest.user, sizeof(be->dest.user));
194			(void)strlcpy(be->dest.domain, evp.dest.domain,
195			sizeof(be->dest.domain));
196			be->esc_class = evp.esc_class;
197			be->esc_code = evp.esc_code;
198			TAILQ_INSERT_TAIL(&msg->envelopes, be, entry);
199			buf[strcspn(buf, "\n")] = '\0';
200			log_debug("debug: bounce: adding report %16"PRIx64": %s", be->id, buf);
201
202			msg->timeout = time(NULL) + 1;
203			TAILQ_INSERT_TAIL(&pending, msg, entry);
204
205			stat_increment("bounce.envelope", 1);
206			bounce_drain();
207			}
208
209			void
210			bounce_fd(int fd)
211			{
212			struct bounce_session *s;
213			struct bounce_message *msg;
214
215			log_debug("debug: bounce: got enqueue socket %d", fd);
216
217			if (fd == -1 \|\| TAILQ_EMPTY(&pending)) {
218			log_debug("debug: bounce: cancelling");
219			if (fd != -1)
220			close(fd);
221			running -= 1;
222			bounce_drain();
223			return;
224			}
225
226			msg = TAILQ_FIRST(&pending);
227
228			s = xcalloc(1, sizeof(*s), "bounce_fd");
229			s->smtpname = xstrdup(msg->smtpname, "bounce_fd");
230			s->state = BOUNCE_EHLO;
231			s->io = io_new();
232			io_set_callback(s->io, bounce_io, s);
233			io_set_fd(s->io, fd);
234			io_set_timeout(s->io, 30000);
235			io_set_read(s->io);
236			s->boundary = generate_uid();
237
238			log_debug("debug: bounce: new session %p", s);
239			stat_increment("bounce.session", 1);
240			}
241
242			static void
243			bounce_timeout(int fd, short ev, void *arg)
244			{
245			log_debug("debug: bounce: timeout");
246
247			bounce_drain();
248			}
249
250			static void
251			bounce_drain()
252			{
253			struct bounce_message *msg;
254			struct timeval tv;
255			time_t t;
256
257			log_debug("debug: bounce: drain: nmessage=%d running=%d",
258			nmessage, running);
259
260			while (1) {
261			if (running >= BOUNCE_MAXRUN) {
262			log_debug("debug: bounce: max session reached");
263			return;
264			}
265
266			if (nmessage == 0) {
267			log_debug("debug: bounce: no more messages");
268			return;
269			}
270
271			if (running >= nmessage) {
272			log_debug("debug: bounce: enough sessions running");
273			return;
274			}
275
276			if ((msg = TAILQ_FIRST(&pending)) == NULL) {
277			log_debug("debug: bounce: no more pending messages");
278			return;
279			}
280
281			t = time(NULL);
282			if (msg->timeout > t) {
283			log_debug("debug: bounce: next message not ready yet");
284			if (!evtimer_pending(&ev_timer, NULL)) {
285			log_debug("debug: bounce: setting timer");
286			tv.tv_sec = msg->timeout - t;
287			tv.tv_usec = 0;
288			evtimer_add(&ev_timer, &tv);
289			}
290			return;
291			}
292
293			log_debug("debug: bounce: requesting new enqueue socket...");
294			m_compose(p_pony, IMSG_QUEUE_SMTP_SESSION, 0, 0, -1, NULL, 0);
295
296			running += 1;
297			}
298			}
299
300			static void
301			bounce_send(struct bounce_session s, const char fmt, ...)
302			{
303			va_list ap;
304			char *p;
305			int len;
306
307			va_start(ap, fmt);
308			if ((len = vasprintf(&p, fmt, ap)) == -1)
309			fatal("bounce: vasprintf");
310			va_end(ap);
311
312			log_trace(TRACE_BOUNCE, "bounce: %p: >>> %s", s, p);
313
314			io_xprintf(s->io, "%s\n", p);
315
316			free(p);
317			}
318
319			static const char *
320			bounce_duration(long long int d)
321			{
322			static char buf[32];
323
324			if (d < 60) {
325			(void)snprintf(buf, sizeof buf, "%lld second%s", d,
326			(d == 1) ? "" : "s");
327			} else if (d < 3600) {
328			d = d / 60;
329			(void)snprintf(buf, sizeof buf, "%lld minute%s", d,
330			(d == 1) ? "" : "s");
331			}
332			else if (d < 3600 * 24) {
333			d = d / 3600;
334			(void)snprintf(buf, sizeof buf, "%lld hour%s", d,
335			(d == 1) ? "" : "s");
336			}
337			else {
338			d = d / (3600 * 24);
339			(void)snprintf(buf, sizeof buf, "%lld day%s", d,
340			(d == 1) ? "" : "s");
341			}
342			return (buf);
343			}
344
345			#define NOTICE_INTRO \
346			" Hi!\n\n" \
347			" This is the MAILER-DAEMON, please DO NOT REPLY to this email.\n"
348
349			const char *notice_error =
350			" An error has occurred while attempting to deliver a message for\n"
351			" the following list of recipients:\n\n";
352
353			const char *notice_warning =
354			" A message is delayed for more than %s for the following\n"
355			" list of recipients:\n\n";
356
357			const char *notice_warning2 =
358			" Please note that this is only a temporary failure report.\n"
359			" The message is kept in the queue for up to %s.\n"
360			" You DO NOT NEED to re-send the message to these recipients.\n\n";
361
362			const char *notice_success =
363			" Your message was successfully delivered to these recipients.\n\n";
364
365			const char *notice_relay =
366			" Your message was relayed to these recipients.\n\n";
367
368			static int
369			bounce_next_message(struct bounce_session *s)
370			{
371			struct bounce_message *msg;
372			char buf[LINE_MAX];
373			int fd;
374			time_t now;
375
376			again:
377
378			now = time(NULL);
379
380			TAILQ_FOREACH(msg, &pending, entry) {
381			if (msg->timeout > now)
382			continue;
383			if (strcmp(msg->smtpname, s->smtpname))
384			continue;
385			break;
386			}
387			if (msg == NULL)
388			return (0);
389
390			TAILQ_REMOVE(&pending, msg, entry);
391			SPLAY_REMOVE(bounce_message_tree, &messages, msg);
392
393			if ((fd = queue_message_fd_r(msg->msgid)) == -1) {
394			bounce_delivery(msg, IMSG_QUEUE_DELIVERY_TEMPFAIL,
395			"Could not open message fd");
396			goto again;
397			}
398
399			if ((s->msgfp = fdopen(fd, "r")) == NULL) {
400			(void)snprintf(buf, sizeof(buf), "fdopen: %s", strerror(errno));
401			log_warn("warn: bounce: fdopen");
402			close(fd);
403			bounce_delivery(msg, IMSG_QUEUE_DELIVERY_TEMPFAIL, buf);
404			goto again;
405			}
406
407			s->msg = msg;
408			return (1);
409			}
410
411			static int
412			bounce_next(struct bounce_session *s)
413			{
414			struct bounce_envelope *evp;
415			char *line = NULL;
416			size_t n, sz = 0;
417			ssize_t len;
418
419			switch (s->state) {
420			case BOUNCE_EHLO:
421			bounce_send(s, "EHLO %s", s->smtpname);
422			s->state = BOUNCE_MAIL;
423			break;
424
425			case BOUNCE_MAIL:
426			case BOUNCE_DATA_END:
427			log_debug("debug: bounce: %p: getting next message...", s);
428			if (bounce_next_message(s) == 0) {
429			log_debug("debug: bounce: %p: no more messages", s);
430			bounce_send(s, "QUIT");
431			s->state = BOUNCE_CLOSE;
432			break;
433			}
434			log_debug("debug: bounce: %p: found message %08"PRIx32,
435			s, s->msg->msgid);
436			bounce_send(s, "MAIL FROM: <>");
437			s->state = BOUNCE_RCPT;
438			break;
439
440			case BOUNCE_RCPT:
441			bounce_send(s, "RCPT TO: <%s>", s->msg->to);
442			s->state = BOUNCE_DATA;
443			break;
444
445			case BOUNCE_DATA:
446			bounce_send(s, "DATA");
447			s->state = BOUNCE_DATA_NOTICE;
448			break;
449
450			case BOUNCE_DATA_NOTICE:
451			/* Construct an appropriate notice. */
452
453			io_xprintf(s->io,
454			"Subject: Delivery status notification: %s\n"
455			"From: Mailer Daemon <MAILER-DAEMON@%s>\n"
456			"To: %s\n"
457			"Date: %s\n"
458			"MIME-Version: 1.0\n"
459			"Content-Type: multipart/mixed;"
460			"boundary=\"%16" PRIu64 "/%s\"\n"
461			"\n"
462			"This is a MIME-encapsulated message.\n"
463			"\n",
464			action_str(&s->msg->bounce),
465			s->smtpname,
466			s->msg->to,
467			time_to_text(time(NULL)),
468			s->boundary,
469			s->smtpname);
470
471			io_xprintf(s->io,
472			"--%16" PRIu64 "/%s\n"
473			"Content-Description: Notification\n"
474			"Content-Type: text/plain; charset=us-ascii\n"
475			"\n"
476			NOTICE_INTRO
477			"\n",
478			s->boundary, s->smtpname);
479
480			switch (s->msg->bounce.type) {
481			case B_ERROR:
482			io_xprint(s->io, notice_error);
483			break;
484			case B_WARNING:
485			io_xprintf(s->io, notice_warning,
486			bounce_duration(s->msg->bounce.delay));
487			break;
488			case B_DSN:
489			io_xprint(s->io, s->msg->bounce.mta_without_dsn ?
490			notice_relay : notice_success);
491			break;
492			default:
493			log_warn("warn: bounce: unknown bounce_type");
494			}
495
496			TAILQ_FOREACH(evp, &s->msg->envelopes, entry) {
497			io_xprint(s->io, evp->report);
498			}
499			io_xprint(s->io, "\n");
500
501			if (s->msg->bounce.type == B_WARNING)
502			io_xprintf(s->io, notice_warning2,
503			bounce_duration(s->msg->bounce.expire));
504
505			io_xprintf(s->io,
506			" Below is a copy of the original message:\n"
507			"\n");
508
509			io_xprintf(s->io,
510			"--%16" PRIu64 "/%s\n"
511			"Content-Description: Delivery Report\n"
512			"Content-Type: message/delivery-status\n"
513			"\n",
514			s->boundary, s->smtpname);
515
516			io_xprintf(s->io,
517			"Reporting-MTA: dns; %s\n"
518			"\n",
519			s->smtpname);
520
521			TAILQ_FOREACH(evp, &s->msg->envelopes, entry) {
522			io_xprintf(s->io,
523			"Final-Recipient: rfc822; %s@%s\n"
524			"Action: %s\n"
525			"Status: %s\n"
526			"\n",
527			evp->dest.user,
528			evp->dest.domain,
529			action_str(&s->msg->bounce),
530			esc_code(evp->esc_class, evp->esc_code));
531			}
532
533			log_trace(TRACE_BOUNCE, "bounce: %p: >>> [... %zu bytes ...]",
534			s, io_queued(s->io));
535
536			s->state = BOUNCE_DATA_MESSAGE;
537			break;
538
539			case BOUNCE_DATA_MESSAGE:
540			io_xprintf(s->io,
541			"--%16" PRIu64 "/%s\n"
542			"Content-Description: Message headers\n"
543			"Content-Type: text/rfc822-headers\n"
544			"\n",
545			s->boundary, s->smtpname);
546
547			n = io_queued(s->io);
548			while (io_queued(s->io) < BOUNCE_HIWAT) {
549			if ((len = getline(&line, &sz, s->msgfp)) == -1)
550			break;
551			if (len == 1 && line[0] == '\n' && /* end of headers */
552			s->msg->bounce.type == B_DSN &&
553			s->msg->bounce.dsn_ret == DSN_RETHDRS) {
554			free(line);
555			fclose(s->msgfp);
556			s->msgfp = NULL;
557			io_xprintf(s->io,
558			"\n--%16" PRIu64 "/%s--\n", s->boundary,
559			s->smtpname);
560			bounce_send(s, ".");
561			s->state = BOUNCE_DATA_END;
562			return (0);
563			}
564			line[len - 1] = '\0';
565			io_xprintf(s->io, "%s%s\n",
566			(len == 2 && line[0] == '.') ? "." : "", line);
567			}
568			free(line);
569
570			if (ferror(s->msgfp)) {
571			fclose(s->msgfp);
572			s->msgfp = NULL;
573			bounce_delivery(s->msg, IMSG_QUEUE_DELIVERY_TEMPFAIL,
574			"Error reading message");
575			s->msg = NULL;
576			return (-1);
577			}
578
579			io_xprintf(s->io,
580			"\n--%16" PRIu64 "/%s--\n", s->boundary, s->smtpname);
581
582			log_trace(TRACE_BOUNCE, "bounce: %p: >>> [... %zu bytes ...]",
583			s, io_queued(s->io) - n);
584
585			if (feof(s->msgfp)) {
586			fclose(s->msgfp);
587			s->msgfp = NULL;
588			bounce_send(s, ".");
589			s->state = BOUNCE_DATA_END;
590			}
591			break;
592
593			case BOUNCE_QUIT:
594			bounce_send(s, "QUIT");
595			s->state = BOUNCE_CLOSE;
596			break;
597
598			default:
599			fatalx("bounce: bad state");
600			}
601
602			return (0);
603			}
604
605
606			static void
607			bounce_delivery(struct bounce_message msg, int delivery, const char status)
608			{
609			struct bounce_envelope *be;
610			struct envelope evp;
611			size_t n;
612			const char *f;
613
614			n = 0;
615			while ((be = TAILQ_FIRST(&msg->envelopes))) {
616			if (delivery == IMSG_QUEUE_DELIVERY_TEMPFAIL) {
617			if (queue_envelope_load(be->id, &evp) == 0) {
618			fatalx("could not reload envelope!");
619			}
620			evp.retry++;
621			evp.lasttry = msg->timeout;
622			envelope_set_errormsg(&evp, "%s", status);
623			queue_envelope_update(&evp);
624			m_create(p_scheduler, delivery, 0, 0, -1);
625			m_add_envelope(p_scheduler, &evp);
626			m_close(p_scheduler);
627			} else {
628			m_create(p_scheduler, delivery, 0, 0, -1);
629			m_add_evpid(p_scheduler, be->id);
630			m_close(p_scheduler);
631			queue_envelope_delete(be->id);
632			}
633			TAILQ_REMOVE(&msg->envelopes, be, entry);
634			free(be->report);
635			free(be);
636			n += 1;
637			}
638
639
640			if (delivery == IMSG_QUEUE_DELIVERY_TEMPFAIL)
641			f = "TempFail";
642			else if (delivery == IMSG_QUEUE_DELIVERY_PERMFAIL)
643			f = "PermFail";
644			else
645			f = NULL;
646
647			if (f)
648			log_warnx("warn: %s injecting failure report on message %08"
649			PRIx32 " to <%s> for %zu envelope%s: %s",
650			f, msg->msgid, msg->to, n, n > 1 ? "s":"", status);
651
652			nmessage -= 1;
653			stat_decrement("bounce.message", 1);
654			stat_decrement("bounce.envelope", n);
655			free(msg->smtpname);
656			free(msg->to);
657			free(msg);
658			}
659
660			static void
661			bounce_status(struct bounce_session s, const char fmt, ...)
662			{
663			va_list ap;
664			char *status;
665			int len, delivery;
666
667			/* Ignore if there is no message */
668			if (s->msg == NULL)
669			return;
670
671			va_start(ap, fmt);
672			if ((len = vasprintf(&status, fmt, ap)) == -1)
673			fatal("bounce: vasprintf");
674			va_end(ap);
675
676			if (*status == '2')
677			delivery = IMSG_QUEUE_DELIVERY_OK;
678			else if (status == '5' \|\| status == '6')
679			delivery = IMSG_QUEUE_DELIVERY_PERMFAIL;
680			else
681			delivery = IMSG_QUEUE_DELIVERY_TEMPFAIL;
682
683			bounce_delivery(s->msg, delivery, status);
684			s->msg = NULL;
685			if (s->msgfp)
686			fclose(s->msgfp);
687
688			free(status);
689			}
690
691			static void
692			bounce_free(struct bounce_session *s)
693			{
694			log_debug("debug: bounce: %p: deleting session", s);
695
696			io_free(s->io);
697
698			free(s->smtpname);
699			free(s);
700
701			running -= 1;
702			stat_decrement("bounce.session", 1);
703			bounce_drain();
704			}
705
706			static void
707			bounce_io(struct io io, int evt, void arg)
708			{
709			struct bounce_session *s = arg;
710			const char *error;
711			char line, msg;
712			int cont;
713			size_t len;
714
715			log_trace(TRACE_IO, "bounce: %p: %s %s", s, io_strevent(evt),
716			io_strio(io));
717
718			switch (evt) {
719			case IO_DATAIN:
720			nextline:
721			line = io_getline(s->io, &len);
722			if (line == NULL && io_datalen(s->io) >= LINE_MAX) {
723			bounce_status(s, "Input too long");
724			bounce_free(s);
725			return;
726			}
727
728			if (line == NULL)
729			break;
730
731			log_trace(TRACE_BOUNCE, "bounce: %p: <<< %s", s, line);
732
733			if ((error = parse_smtp_response(line, len, &msg, &cont))) {
734			bounce_status(s, "Bad response: %s", error);
735			bounce_free(s);
736			return;
737			}
738			if (cont)
739			goto nextline;
740
741			if (s->state == BOUNCE_CLOSE) {
742			bounce_free(s);
743			return;
744			}
745
746			if (line[0] != '2' && line[0] != '3') { /* fail */
747			bounce_status(s, "%s", line);
748			s->state = BOUNCE_QUIT;
749			} else if (s->state == BOUNCE_DATA_END) { /* accepted */
750			bounce_status(s, "%s", line);
751			}
752
753			if (bounce_next(s) == -1) {
754			bounce_free(s);
755			return;
756			}
757
758			io_set_write(io);
759			break;
760
761			case IO_LOWAT:
762			if (s->state == BOUNCE_DATA_MESSAGE)
763			if (bounce_next(s) == -1) {
764			bounce_free(s);
765			return;
766			}
767			if (io_queued(s->io) == 0)
768			io_set_read(io);
769			break;
770
771			default:
772			bounce_status(s, "442 i/o error %d", evt);
773			bounce_free(s);
774			break;
775			}
776			}
777
778			static int
779			bounce_message_cmp(const struct bounce_message *a,
780			const struct bounce_message *b)
781			{
782			int r;
783
784			if (a->msgid < b->msgid)
785			return (-1);
786			if (a->msgid > b->msgid)
787			return (1);
788			if ((r = strcmp(a->smtpname, b->smtpname)))
789			return (r);
790
791			return memcmp(&a->bounce, &b->bounce, sizeof (a->bounce));
792			}
793
794			static const char *
795			action_str(const struct delivery_bounce *b)
796			{
797			switch (b->type) {
798			case B_ERROR:
799			return ("error");
800			case B_WARNING:
801			return ("delayed");
802			case B_DSN:
803			if (b->mta_without_dsn)
804			return ("relayed");
805
806			return ("success");
807			default:
808			log_warn("warn: bounce: unknown bounce_type");
809			return ("");
810			}
811			}
812
813			SPLAY_GENERATE(bounce_message_tree, bounce_message, sp_entry,
814			bounce_message_cmp);