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/* $OpenBSD: queue.c,v 1.119 2012/06/20 20:45:23 eric Exp $ */
/*
* Copyright (c) 2008 Gilles Chehade <gilles@openbsd.org>
* Copyright (c) 2008 Pierre-Yves Ritschard <pyr@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/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <err.h>
#include <event.h>
#include <imsg.h>
#include <libgen.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "smtpd.h"
#include "log.h"
static void queue_imsg(struct imsgev *, struct imsg *);
static void queue_pass_to_runner(struct imsgev *, struct imsg *);
static void queue_shutdown(void);
static void queue_sig_handler(int, short, void *);
static void
queue_imsg(struct imsgev *iev, struct imsg *imsg)
{
struct submit_status ss;
struct envelope *e;
struct mta_batch *mta_batch;
int fd, ret;
log_imsg(PROC_QUEUE, iev->proc, imsg);
if (iev->proc == PROC_SMTP) {
e = imsg->data;
switch (imsg->hdr.type) {
case IMSG_QUEUE_CREATE_MESSAGE:
ss.id = e->session_id;
ss.code = 250;
ss.u.msgid = 0;
ret = queue_message_create(&ss.u.msgid);
if (ret == 0)
ss.code = 421;
imsg_compose_event(iev, IMSG_QUEUE_CREATE_MESSAGE, 0, 0, -1,
&ss, sizeof ss);
return;
case IMSG_QUEUE_REMOVE_MESSAGE:
queue_message_delete(evpid_to_msgid(e->id));
return;
case IMSG_QUEUE_COMMIT_MESSAGE:
ss.id = e->session_id;
ss.code = 250;
if (queue_message_commit(evpid_to_msgid(e->id)))
stat_increment(e->flags & DF_ENQUEUED ?
STATS_QUEUE_LOCAL : STATS_QUEUE_REMOTE);
else
ss.code = 421;
imsg_compose_event(iev, IMSG_QUEUE_COMMIT_MESSAGE, 0, 0, -1,
&ss, sizeof ss);
if (ss.code != 421)
queue_pass_to_runner(iev, imsg);
return;
case IMSG_QUEUE_MESSAGE_FILE:
ss.id = e->session_id;
fd = queue_message_fd_rw(evpid_to_msgid(e->id));
if (fd == -1)
ss.code = 421;
imsg_compose_event(iev, IMSG_QUEUE_MESSAGE_FILE, 0, 0, fd,
&ss, sizeof ss);
return;
case IMSG_SMTP_ENQUEUE:
queue_pass_to_runner(iev, imsg);
return;
}
}
if (iev->proc == PROC_LKA) {
e = imsg->data;
switch (imsg->hdr.type) {
case IMSG_QUEUE_SUBMIT_ENVELOPE:
ss.id = e->session_id;
ret = queue_envelope_create(e);
if (ret == 0) {
ss.code = 421;
imsg_compose_event(env->sc_ievs[PROC_SMTP],
IMSG_QUEUE_TEMPFAIL, 0, 0, -1, &ss,
sizeof ss);
}
return;
case IMSG_QUEUE_COMMIT_ENVELOPES:
ss.id = e->session_id;
ss.code = 250;
imsg_compose_event(env->sc_ievs[PROC_SMTP],
IMSG_QUEUE_COMMIT_ENVELOPES, 0, 0, -1, &ss,
sizeof ss);
return;
}
}
if (iev->proc == PROC_RUNNER) {
/* forward imsgs from runner on its behalf */
imsg_compose_event(env->sc_ievs[imsg->hdr.peerid], imsg->hdr.type,
0, imsg->hdr.pid, imsg->fd, (char *)imsg->data,
imsg->hdr.len - sizeof imsg->hdr);
return;
}
if (iev->proc == PROC_MTA) {
switch (imsg->hdr.type) {
case IMSG_QUEUE_MESSAGE_FD:
mta_batch = imsg->data;
fd = queue_message_fd_r(mta_batch->msgid);
imsg_compose_event(iev, IMSG_QUEUE_MESSAGE_FD, 0, 0,
fd, mta_batch, sizeof *mta_batch);
return;
case IMSG_QUEUE_DELIVERY_OK:
case IMSG_QUEUE_DELIVERY_TEMPFAIL:
case IMSG_QUEUE_DELIVERY_PERMFAIL:
case IMSG_BATCH_DONE:
queue_pass_to_runner(iev, imsg);
return;
}
}
if (iev->proc == PROC_MDA) {
switch (imsg->hdr.type) {
case IMSG_QUEUE_DELIVERY_OK:
case IMSG_QUEUE_DELIVERY_TEMPFAIL:
case IMSG_QUEUE_DELIVERY_PERMFAIL:
case IMSG_MDA_SESS_NEW:
queue_pass_to_runner(iev, imsg);
return;
}
}
if (iev->proc == PROC_CONTROL) {
switch (imsg->hdr.type) {
case IMSG_QUEUE_PAUSE_MDA:
case IMSG_QUEUE_PAUSE_MTA:
case IMSG_QUEUE_RESUME_MDA:
case IMSG_QUEUE_RESUME_MTA:
case IMSG_QUEUE_SCHEDULE:
case IMSG_QUEUE_REMOVE:
queue_pass_to_runner(iev, imsg);
return;
}
}
if (iev->proc == PROC_PARENT) {
switch (imsg->hdr.type) {
case IMSG_CTL_VERBOSE:
log_verbose(*(int *)imsg->data);
queue_pass_to_runner(iev, imsg);
return;
}
}
errx(1, "queue_imsg: unexpected %s imsg", imsg_to_str(imsg->hdr.type));
}
static void
queue_pass_to_runner(struct imsgev *iev, struct imsg *imsg)
{
imsg_compose_event(env->sc_ievs[PROC_RUNNER], imsg->hdr.type,
iev->proc, imsg->hdr.pid, imsg->fd, imsg->data,
imsg->hdr.len - sizeof imsg->hdr);
}
static void
queue_sig_handler(int sig, short event, void *p)
{
switch (sig) {
case SIGINT:
case SIGTERM:
queue_shutdown();
break;
default:
fatalx("queue_sig_handler: unexpected signal");
}
}
static void
queue_shutdown(void)
{
log_info("queue handler exiting");
_exit(0);
}
pid_t
queue(void)
{
pid_t pid;
struct passwd *pw;
struct event ev_sigint;
struct event ev_sigterm;
struct peer peers[] = {
{ PROC_PARENT, imsg_dispatch },
{ PROC_CONTROL, imsg_dispatch },
{ PROC_SMTP, imsg_dispatch },
{ PROC_MDA, imsg_dispatch },
{ PROC_MTA, imsg_dispatch },
{ PROC_LKA, imsg_dispatch },
{ PROC_RUNNER, imsg_dispatch }
};
switch (pid = fork()) {
case -1:
fatal("queue: cannot fork");
case 0:
break;
default:
return (pid);
}
purge_config(PURGE_EVERYTHING);
pw = env->sc_pw;
if (chroot(PATH_SPOOL) == -1)
fatal("queue: chroot");
if (chdir("/") == -1)
fatal("queue: chdir(\"/\")");
smtpd_process = PROC_QUEUE;
setproctitle("%s", env->sc_title[smtpd_process]);
if (setgroups(1, &pw->pw_gid) ||
setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
fatal("queue: cannot drop privileges");
imsg_callback = queue_imsg;
event_init();
signal_set(&ev_sigint, SIGINT, queue_sig_handler, NULL);
signal_set(&ev_sigterm, SIGTERM, queue_sig_handler, NULL);
signal_add(&ev_sigint, NULL);
signal_add(&ev_sigterm, NULL);
signal(SIGPIPE, SIG_IGN);
signal(SIGHUP, SIG_IGN);
/*
* queue opens fds for four purposes: smtp, mta, mda, and bounces.
* Therefore, use all available fd space and set the maxconn (=max
* session count for mta and mda) to a quarter of this value.
*/
fdlimit(1.0);
if ((env->sc_maxconn = availdesc() / 4) < 1)
fatalx("runner: fd starvation");
config_pipes(peers, nitems(peers));
config_peers(peers, nitems(peers));
if (event_dispatch() < 0)
fatal("event_dispatch");
queue_shutdown();
return (0);
}
void
queue_submit_envelope(struct envelope *ep)
{
imsg_compose_event(env->sc_ievs[PROC_QUEUE],
IMSG_QUEUE_SUBMIT_ENVELOPE, 0, 0, -1,
ep, sizeof(*ep));
}
void
queue_commit_envelopes(struct envelope *ep)
{
imsg_compose_event(env->sc_ievs[PROC_QUEUE],
IMSG_QUEUE_COMMIT_ENVELOPES, 0, 0, -1,
ep, sizeof(*ep));
}
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