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/* $OpenBSD: dispatcher.c,v 1.5 2021/06/14 17:58:15 eric Exp $ */
/*
* Copyright (c) 2014 Gilles Chehade <gilles@poolp.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 <pwd.h>
#include <signal.h>
#include <unistd.h>
#include "smtpd.h"
#include "log.h"
void mda_imsg(struct mproc *, struct imsg *);
void mta_imsg(struct mproc *, struct imsg *);
void smtp_imsg(struct mproc *, struct imsg *);
static void dispatcher_shutdown(void);
void
dispatcher_imsg(struct mproc *p, struct imsg *imsg)
{
struct msg m;
int v;
if (imsg == NULL)
dispatcher_shutdown();
switch (imsg->hdr.type) {
case IMSG_GETADDRINFO:
case IMSG_GETADDRINFO_END:
case IMSG_GETNAMEINFO:
case IMSG_RES_QUERY:
resolver_dispatch_result(p, imsg);
return;
case IMSG_CONF_START:
return;
case IMSG_CONF_END:
smtp_configure();
return;
case IMSG_CTL_VERBOSE:
m_msg(&m, imsg);
m_get_int(&m, &v);
m_end(&m);
log_trace_verbose(v);
return;
case IMSG_CTL_PROFILE:
m_msg(&m, imsg);
m_get_int(&m, &v);
m_end(&m);
profiling = v;
return;
/* smtp imsg */
case IMSG_SMTP_CHECK_SENDER:
case IMSG_SMTP_EXPAND_RCPT:
case IMSG_SMTP_LOOKUP_HELO:
case IMSG_SMTP_AUTHENTICATE:
case IMSG_SMTP_MESSAGE_COMMIT:
case IMSG_SMTP_MESSAGE_CREATE:
case IMSG_SMTP_MESSAGE_OPEN:
case IMSG_FILTER_SMTP_PROTOCOL:
case IMSG_FILTER_SMTP_DATA_BEGIN:
case IMSG_QUEUE_ENVELOPE_SUBMIT:
case IMSG_QUEUE_ENVELOPE_COMMIT:
case IMSG_QUEUE_SMTP_SESSION:
case IMSG_CTL_SMTP_SESSION:
case IMSG_CTL_PAUSE_SMTP:
case IMSG_CTL_RESUME_SMTP:
smtp_imsg(p, imsg);
return;
/* mta imsg */
case IMSG_QUEUE_TRANSFER:
case IMSG_MTA_OPEN_MESSAGE:
case IMSG_MTA_LOOKUP_CREDENTIALS:
case IMSG_MTA_LOOKUP_SMARTHOST:
case IMSG_MTA_LOOKUP_SOURCE:
case IMSG_MTA_LOOKUP_HELO:
case IMSG_MTA_DNS_HOST:
case IMSG_MTA_DNS_HOST_END:
case IMSG_MTA_DNS_MX_PREFERENCE:
case IMSG_CTL_RESUME_ROUTE:
case IMSG_CTL_MTA_SHOW_HOSTS:
case IMSG_CTL_MTA_SHOW_RELAYS:
case IMSG_CTL_MTA_SHOW_ROUTES:
case IMSG_CTL_MTA_SHOW_HOSTSTATS:
case IMSG_CTL_MTA_BLOCK:
case IMSG_CTL_MTA_UNBLOCK:
case IMSG_CTL_MTA_SHOW_BLOCK:
mta_imsg(p, imsg);
return;
/* mda imsg */
case IMSG_MDA_LOOKUP_USERINFO:
case IMSG_QUEUE_DELIVER:
case IMSG_MDA_OPEN_MESSAGE:
case IMSG_MDA_FORK:
case IMSG_MDA_DONE:
mda_imsg(p, imsg);
return;
default:
break;
}
fatalx("session_imsg: unexpected %s imsg", imsg_to_str(imsg->hdr.type));
}
static void
dispatcher_shutdown(void)
{
log_debug("debug: dispatcher agent exiting");
_exit(0);
}
int
dispatcher(void)
{
struct passwd *pw;
ca_engine_init();
mda_postfork();
mta_postfork();
smtp_postfork();
/* do not purge listeners and pki, they are purged
* in smtp_configure()
*/
purge_config(PURGE_TABLES|PURGE_RULES);
if ((pw = getpwnam(SMTPD_USER)) == NULL)
fatalx("unknown user " SMTPD_USER);
if (chroot(PATH_CHROOT) == -1)
fatal("dispatcher: chroot");
if (chdir("/") == -1)
fatal("dispatcher: chdir(\"/\")");
config_process(PROC_DISPATCHER);
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("dispatcher: cannot drop privileges");
imsg_callback = dispatcher_imsg;
event_init();
mda_postprivdrop();
mta_postprivdrop();
smtp_postprivdrop();
signal(SIGINT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
signal(SIGPIPE, SIG_IGN);
signal(SIGHUP, SIG_IGN);
config_peer(PROC_PARENT);
config_peer(PROC_QUEUE);
config_peer(PROC_LKA);
config_peer(PROC_CONTROL);
config_peer(PROC_CA);
if (pledge("stdio inet unix recvfd sendfd", NULL) == -1)
fatal("pledge");
event_dispatch();
fatalx("exited event loop");
return (0);
}
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