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/* SPDX-License-Identifier: GPL-2.0 */
#include <sys/signalfd.h>
#include <signal.h>
#include <fcntl.h>
#include <unistd.h>
#include <systemd/sd-daemon.h>
#include "main.h"
#include "signal-handler.h"
#include "uring.h"
#include "server.h"
#include "server-config.h"
#include "igmp.h"
#include "announce.h"
#include "idle.h"
#include "ptimer.h"
struct signal_ev {
struct uring_task task;
struct uring_task_buf tbuf;
int pipe[2];
};
static void signal_delete()
{
assert_return(cfg->signal);
uring_task_destroy(&cfg->signal->task);
}
static void signalfd_read(struct uring_task *task, int res)
{
struct signal_ev *signal = container_of(task, struct signal_ev, task);
struct server *server, *stmp;
static unsigned count = 0;
siginfo_t *sia, *si;
assert_return(task);
assert_task_alive(DBG_SIG, task);
if (res == 0 || res % sizeof(*si))
die("error in signalfd (%i vs %zu)", res, sizeof(*si));
sia = (siginfo_t *)(task->tbuf->buf);
for (unsigned i = 0; i < res / sizeof(*si); i++) {
si = &sia[i];
switch (si->si_signo) {
case SIGUSR1: {
debug(DBG_SIG, "Got a SIGUSR1");
if (si->si_code != SI_ASYNCNL || !si->si_ptr) {
error("SIGUSR1: unexpected values in siginfo");
goto out;
}
server_cfg_async_dns_update(si->si_ptr);
break;
}
case SIGUSR2:
debug(DBG_SIG, "got a SIGUSR2");
dump_tree();
break;
case SIGTERM:
debug(DBG_SIG, "Got a SIGINT/SIGHUP");
verbose("got a signal to quit");
sd_notifyf(0, "STOPPING=1\nSTATUS=Received signal, exiting");
exit(EXIT_SUCCESS);
break;
case SIGINT:
case SIGHUP:
count++;
if (count > 5) {
dump_tree();
exit(EXIT_FAILURE);
}
verbose("got a signal to dump tree");
sd_notifyf(0, "STOPPING=1\nSTATUS=Received signal, exiting");
dump_tree();
signal_delete();
ptimer_delete();
igmp_delete();
announce_delete();
idle_delete();
server_cfg_monitor_delete();
list_for_each_entry_safe(server, stmp, &cfg->servers, list)
server_delete(server);
uring_delete();
return;
default:
error("got an unknown signal: %i", si->si_signo);
break;
}
}
out:
uring_tbuf_read(&signal->task, signalfd_read);
}
static void hack_signal_handler(int signum, siginfo_t *si,
_unused_ void *ucontext)
{
ssize_t r;
assert_return(signum > 0 && si);
r = write(cfg->signal->pipe[PIPE_WR], si, sizeof(*si));
if (r != sizeof(*si))
error("write: %zi\n", r);
}
static void signal_free(struct uring_task *task)
{
struct signal_ev *signal = container_of(task, struct signal_ev, task);
assert_return(task);
debug(DBG_SIG, "called");
close(signal->pipe[PIPE_WR]);
cfg->signal = NULL;
xfree(signal);
}
void signal_refdump()
{
assert_return(cfg->signal);
uring_task_refdump(&cfg->signal->task);
}
void signal_init()
{
// sigset_t mask;
struct signal_ev *signal;
assert_return(!cfg->signal);
signal = zmalloc(sizeof(*signal));
if (!signal)
die("malloc: %m");
if (pipe2(signal->pipe, O_CLOEXEC) < 0)
die("pipe2: %m");
/*
sigfillset(&mask);
if (sigprocmask(SIG_BLOCK, &mask, NULL) < 0)
die("sigprocmask: %m");
sfd = signalfd(-1, &mask, SFD_CLOEXEC);
if (sfd < 0)
die("signalfd: %m");
*/
struct sigaction action;
sigfillset(&action.sa_mask);
action.sa_sigaction = hack_signal_handler;
action.sa_flags = SA_SIGINFO;
sigaction(SIGINT, &action, NULL);
sigaction(SIGHUP, &action, NULL);
sigaction(SIGTERM, &action, NULL);
sigaction(SIGUSR1, &action, NULL);
sigaction(SIGUSR2, &action, NULL);
action.sa_handler = SIG_IGN;
action.sa_flags = 0;
sigaction(SIGPIPE, &action, NULL);
debug(DBG_SIG, "using pipe fds %i -> %i", signal->pipe[PIPE_WR],
signal->pipe[PIPE_RD]);
uring_task_init(&signal->task, "signal", uring_parent(), signal_free);
uring_task_set_fd(&signal->task, signal->pipe[PIPE_RD]);
uring_task_set_buf(&signal->task, &signal->tbuf);
cfg->signal = signal;
uring_tbuf_read(&signal->task, signalfd_read);
}
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