void
queue_flow_control(void)
{
size_t bufsz;
int oldlimit = limit;
int set, unset;
bufsz = p_mda->bytes_queued + p_mta->bytes_queued;
if (bufsz <= flow_agent_lowat)
limit &= ~LIMIT_AGENT;
else if (bufsz > flow_agent_hiwat)
limit |= LIMIT_AGENT;
if (p_scheduler->bytes_queued <= flow_scheduler_lowat)
limit &= ~LIMIT_SCHEDULER;
else if (p_scheduler->bytes_queued > flow_scheduler_hiwat)
limit |= LIMIT_SCHEDULER;
set = limit & (limit ^ oldlimit);
unset = oldlimit & (limit ^ oldlimit);
if (set & LIMIT_SCHEDULER) {
log_warnx("warn: queue: Hiwat reached on scheduler buffer: "
"suspending transfer, delivery and lookup input");
mproc_disable(p_mta);
mproc_disable(p_mda);
mproc_disable(p_lka);
}
else if (unset & LIMIT_SCHEDULER) {
log_warnx("warn: queue: Down to lowat on scheduler buffer: "
"resuming transfer, delivery and lookup input");
mproc_enable(p_mta);
mproc_enable(p_mda);
mproc_enable(p_lka);
}
if (set & LIMIT_AGENT) {
log_warnx("warn: queue: Hiwat reached on transfer and delivery "
"buffers: suspending scheduler input");
mproc_disable(p_scheduler);
}
else if (unset & LIMIT_AGENT) {
log_warnx("warn: queue: Down to lowat on transfer and delivery "
"buffers: resuming scheduler input");
mproc_enable(p_scheduler);
}
}
pid_t
ca(void)
{
pid_t pid;
struct passwd *pw;
struct event ev_sigint;
struct event ev_sigterm;
switch (pid = fork()) {
case -1:
fatal("ca: cannot fork");
case 0:
post_fork(PROC_CA);
break;
default:
return (pid);
}
purge_config(PURGE_LISTENERS|PURGE_TABLES|PURGE_RULES);
if ((pw = getpwnam(SMTPD_USER)) == NULL)
fatalx("unknown user " SMTPD_USER);
if (chroot(PATH_CHROOT) == -1)
fatal("ca: chroot");
if (chdir("/") == -1)
fatal("ca: chdir(\"/\")");
config_process(PROC_CA);
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("ca: cannot drop privileges");
imsg_callback = ca_imsg;
event_init();
signal_set(&ev_sigint, SIGINT, ca_sig_handler, NULL);
signal_set(&ev_sigterm, SIGTERM, ca_sig_handler, NULL);
signal_add(&ev_sigint, NULL);
signal_add(&ev_sigterm, NULL);
signal(SIGPIPE, SIG_IGN);
signal(SIGHUP, SIG_IGN);
config_peer(PROC_CONTROL);
config_peer(PROC_PARENT);
config_peer(PROC_PONY);
config_done();
/* Ignore them until we get our config */
mproc_disable(p_pony);
if (event_dispatch() < 0)
fatal("event_dispatch");
ca_shutdown();
return (0);
}
pid_t
lka(void)
{
pid_t pid;
struct passwd *pw;
struct event ev_sigint;
struct event ev_sigterm;
struct event ev_sigchld;
switch (pid = fork()) {
case -1:
fatal("lka: cannot fork");
case 0:
break;
default:
return (pid);
}
purge_config(PURGE_EVERYTHING);
if ((pw = getpwnam(SMTPD_USER)) == NULL)
fatalx("unknown user " SMTPD_USER);
config_process(PROC_LKA);
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("lka: cannot drop privileges");
imsg_callback = lka_imsg;
event_init();
signal_set(&ev_sigint, SIGINT, lka_sig_handler, NULL);
signal_set(&ev_sigterm, SIGTERM, lka_sig_handler, NULL);
signal_set(&ev_sigchld, SIGCHLD, lka_sig_handler, NULL);
signal_add(&ev_sigint, NULL);
signal_add(&ev_sigterm, NULL);
signal_add(&ev_sigchld, NULL);
signal(SIGPIPE, SIG_IGN);
signal(SIGHUP, SIG_IGN);
/*
* lka opens all kinds of files and sockets, so bump the limit to max.
* XXX: need to analyse the exact hard limit.
*/
fdlimit(1.0);
config_peer(PROC_PARENT);
config_peer(PROC_QUEUE);
config_peer(PROC_SMTP);
config_peer(PROC_MDA);
config_peer(PROC_MTA);
config_peer(PROC_CONTROL);
config_done();
/* Ignore them until we get our config */
mproc_disable(p_mda);
mproc_disable(p_mta);
mproc_disable(p_smtp);
if (event_dispatch() < 0)
fatal("event_dispatch");
lka_shutdown();
return (0);
}
pid_t
mfa(void)
{
pid_t pid;
struct passwd *pw;
struct event ev_sigint;
struct event ev_sigterm;
struct event ev_sigchld;
switch (pid = fork()) {
case -1:
fatal("filter: cannot fork");
case 0:
break;
default:
return (pid);
}
mfa_filter_prepare();
purge_config(PURGE_EVERYTHING);
if ((pw = getpwnam(SMTPD_USER)) == NULL)
fatalx("unknown user " SMTPD_USER);
config_process(PROC_MFA);
if (chroot(PATH_CHROOT) == -1)
fatal("scheduler: chroot");
if (chdir("/") == -1)
fatal("scheduler: chdir(\"/\")");
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("filter: cannot drop privileges");
imsg_callback = mfa_imsg;
event_init();
signal_set(&ev_sigint, SIGINT, mfa_sig_handler, NULL);
signal_set(&ev_sigterm, SIGTERM, mfa_sig_handler, NULL);
signal_set(&ev_sigchld, SIGCHLD, mfa_sig_handler, NULL);
signal_add(&ev_sigint, NULL);
signal_add(&ev_sigterm, NULL);
signal_add(&ev_sigchld, NULL);
signal(SIGPIPE, SIG_IGN);
signal(SIGHUP, SIG_IGN);
config_peer(PROC_PARENT);
config_peer(PROC_SMTP);
config_peer(PROC_CONTROL);
config_done();
mproc_disable(p_smtp);
if (event_dispatch() < 0)
fatal("event_dispatch");
mfa_shutdown();
return (0);
}
