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-rw-r--r--lib/util/event.c798
1 files changed, 798 insertions, 0 deletions
diff --git a/lib/util/event.c b/lib/util/event.c
new file mode 100644
index 0000000..05b3fd0
--- /dev/null
+++ b/lib/util/event.c
@@ -0,0 +1,798 @@
+/*
+ * Copyright (c) 2013-2018 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * 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.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include "compat/stdbool.h"
+#endif /* HAVE_STDBOOL_H */
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#include <errno.h>
+#include <fcntl.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "sudo_compat.h"
+#include "sudo_fatal.h"
+#include "sudo_debug.h"
+#include "sudo_event.h"
+#include "sudo_util.h"
+
+static void sudo_ev_init(struct sudo_event *ev, int fd, short events,
+ sudo_ev_callback_t callback, void *closure);
+
+/* Default event base when none is specified. */
+static struct sudo_event_base *default_base;
+
+/* We need the event base to be available from the signal handler. */
+static struct sudo_event_base *signal_base;
+
+/*
+ * Add an event to the base's active queue and mark it active.
+ * This is extern so sudo_ev_scan_impl() can call it.
+ */
+void
+sudo_ev_activate(struct sudo_event_base *base, struct sudo_event *ev)
+{
+ TAILQ_INSERT_TAIL(&base->active, ev, active_entries);
+ SET(ev->flags, SUDO_EVQ_ACTIVE);
+}
+
+/*
+ * Remove an event from the base's active queue and mark it inactive.
+ */
+static inline void
+sudo_ev_deactivate(struct sudo_event_base *base, struct sudo_event *ev)
+{
+ CLR(ev->flags, SUDO_EVQ_ACTIVE);
+ TAILQ_REMOVE(&base->active, ev, active_entries);
+}
+
+/*
+ * Clear out the base's active queue and mark all events as inactive.
+ */
+static void
+sudo_ev_deactivate_all(struct sudo_event_base *base)
+{
+ struct sudo_event *ev;
+ debug_decl(sudo_ev_deactivate_all, SUDO_DEBUG_EVENT)
+
+ while ((ev = TAILQ_FIRST(&base->active)) != NULL)
+ sudo_ev_deactivate(base, ev);
+
+ debug_return;
+}
+
+/*
+ * Activate all signal events for which the corresponding signal_pending[]
+ * flag is set.
+ */
+static void
+sudo_ev_activate_sigevents(struct sudo_event_base *base)
+{
+ struct sudo_event *ev;
+ sigset_t set, oset;
+ int i;
+ debug_decl(sudo_ev_activate_sigevents, SUDO_DEBUG_EVENT)
+
+ /*
+ * We treat this as a critical section since the signal handler
+ * could modify the siginfo[] entry.
+ */
+ sigfillset(&set);
+ sigprocmask(SIG_BLOCK, &set, &oset);
+ base->signal_caught = 0;
+ for (i = 0; i < NSIG; i++) {
+ if (!base->signal_pending[i])
+ continue;
+ base->signal_pending[i] = 0;
+ TAILQ_FOREACH(ev, &base->signals[i], entries) {
+ if (ISSET(ev->events, SUDO_EV_SIGINFO)) {
+ struct sudo_ev_siginfo_container *sc = ev->closure;
+ if (base->siginfo[i]->si_signo == 0) {
+ /* No siginfo available. */
+ sc->siginfo = NULL;
+ } else {
+ sc->siginfo = (siginfo_t *)sc->si_buf;
+ memcpy(sc->siginfo, base->siginfo[i], sizeof(siginfo_t));
+ }
+ }
+ /* Make event active. */
+ ev->revents = ev->events & (SUDO_EV_SIGNAL|SUDO_EV_SIGINFO);
+ TAILQ_INSERT_TAIL(&base->active, ev, active_entries);
+ SET(ev->flags, SUDO_EVQ_ACTIVE);
+ }
+ }
+ sigprocmask(SIG_SETMASK, &oset, NULL);
+
+ debug_return;
+}
+
+/*
+ * Internal callback for SUDO_EV_SIGNAL and SUDO_EV_SIGINFO.
+ */
+static void
+signal_pipe_cb(int fd, int what, void *v)
+{
+ struct sudo_event_base *base = v;
+ unsigned char ch;
+ ssize_t nread;
+ debug_decl(signal_pipe_cb, SUDO_DEBUG_EVENT)
+
+ /*
+ * Drain signal_pipe, the signal handler updated base->signals_pending.
+ * Actual processing of signal events is done when poll/select is
+ * interrupted by a signal.
+ */
+ while ((nread = read(fd, &ch, 1)) > 0) {
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ "%s: received signal %d", __func__, (int)ch);
+ }
+ if (nread == -1 && errno != EAGAIN) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO|SUDO_DEBUG_ERRNO,
+ "%s: error reading from signal pipe fd %d", __func__, fd);
+ }
+
+ /* Activate signal events. */
+ sudo_ev_activate_sigevents(base);
+
+ debug_return;
+}
+
+static int
+sudo_ev_base_init(struct sudo_event_base *base)
+{
+ int i;
+ debug_decl(sudo_ev_base_init, SUDO_DEBUG_EVENT)
+
+ TAILQ_INIT(&base->events);
+ TAILQ_INIT(&base->timeouts);
+ for (i = 0; i < NSIG; i++)
+ TAILQ_INIT(&base->signals[i]);
+ if (sudo_ev_base_alloc_impl(base) != 0) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR,
+ "%s: unable to allocate impl base", __func__);
+ goto bad;
+ }
+ if (pipe2(base->signal_pipe, O_NONBLOCK|O_CLOEXEC) != 0) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR,
+ "%s: unable to create signal pipe", __func__);
+ goto bad;
+ }
+ sudo_ev_init(&base->signal_event, base->signal_pipe[0],
+ SUDO_EV_READ|SUDO_EV_PERSIST, signal_pipe_cb, base);
+
+ debug_return_int(0);
+bad:
+ /* Note: signal_pipe[] not filled in. */
+ sudo_ev_base_free_impl(base);
+ debug_return_int(-1);
+}
+
+struct sudo_event_base *
+sudo_ev_base_alloc_v1(void)
+{
+ struct sudo_event_base *base;
+ debug_decl(sudo_ev_base_alloc, SUDO_DEBUG_EVENT)
+
+ base = calloc(1, sizeof(*base));
+ if (base == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "%s: unable to allocate base", __func__);
+ debug_return_ptr(NULL);
+ }
+ if (sudo_ev_base_init(base) != 0) {
+ free(base);
+ debug_return_ptr(NULL);
+ }
+ debug_return_ptr(base);
+}
+
+void
+sudo_ev_base_free_v1(struct sudo_event_base *base)
+{
+ struct sudo_event *ev, *next;
+ int i;
+ debug_decl(sudo_ev_base_free, SUDO_DEBUG_EVENT)
+
+ if (base == NULL)
+ debug_return;
+
+ /* Reset the default base if necessary. */
+ if (default_base == base)
+ default_base = NULL;
+
+ /* Remove any existing events before freeing the base. */
+ TAILQ_FOREACH_SAFE(ev, &base->events, entries, next) {
+ sudo_ev_del(base, ev);
+ }
+ for (i = 0; i < NSIG; i++) {
+ TAILQ_FOREACH_SAFE(ev, &base->signals[i], entries, next) {
+ sudo_ev_del(base, ev);
+ }
+ free(base->siginfo[i]);
+ free(base->orig_handlers[i]);
+ }
+ sudo_ev_base_free_impl(base);
+ close(base->signal_pipe[0]);
+ close(base->signal_pipe[1]);
+ free(base);
+
+ debug_return;
+}
+
+void
+sudo_ev_base_setdef_v1(struct sudo_event_base *base)
+{
+ debug_decl(sudo_ev_base_setdef, SUDO_DEBUG_EVENT)
+
+ default_base = base;
+
+ debug_return;
+}
+
+/*
+ * Clear and fill in a struct sudo_event.
+ */
+static void
+sudo_ev_init(struct sudo_event *ev, int fd, short events,
+ sudo_ev_callback_t callback, void *closure)
+{
+ debug_decl(sudo_ev_init, SUDO_DEBUG_EVENT)
+
+ /* XXX - sanity check events value */
+ memset(ev, 0, sizeof(*ev));
+ ev->fd = fd;
+ ev->events = events;
+ ev->pfd_idx = -1;
+ ev->callback = callback;
+ ev->closure = closure;
+
+ debug_return;
+}
+
+struct sudo_event *
+sudo_ev_alloc_v1(int fd, short events, sudo_ev_callback_t callback, void *closure)
+{
+ struct sudo_event *ev;
+ debug_decl(sudo_ev_alloc, SUDO_DEBUG_EVENT)
+
+ ev = malloc(sizeof(*ev));
+ if (ev == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "%s: unable to allocate event", __func__);
+ debug_return_ptr(NULL);
+ }
+ /* For SUDO_EV_SIGINFO we use a container to store closure + siginfo_t */
+ if (ISSET(events, SUDO_EV_SIGINFO)) {
+ struct sudo_ev_siginfo_container *container =
+ malloc(sizeof(*container) + sizeof(siginfo_t) - 1);
+ if (container == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "%s: unable to allocate siginfo container", __func__);
+ free(ev);
+ debug_return_ptr(NULL);
+ }
+ container->closure = closure;
+ closure = container;
+ }
+ sudo_ev_init(ev, fd, events, callback, closure);
+
+ debug_return_ptr(ev);
+}
+
+void
+sudo_ev_free_v1(struct sudo_event *ev)
+{
+ debug_decl(sudo_ev_free, SUDO_DEBUG_EVENT)
+
+ if (ev == NULL)
+ debug_return;
+
+ /* Make sure ev is not in use before freeing it. */
+ if (ISSET(ev->flags, SUDO_EVQ_INSERTED))
+ (void)sudo_ev_del(NULL, ev);
+ if (ISSET(ev->events, SUDO_EV_SIGINFO))
+ free(ev->closure);
+ free(ev);
+
+ debug_return;
+}
+
+static void
+sudo_ev_handler(int signo, siginfo_t *info, void *context)
+{
+ unsigned char ch = (unsigned char)signo;
+
+ if (signal_base != NULL) {
+ /*
+ * Update signals_pending[] and siginfo[].
+ * All signals must be blocked any time siginfo[] is accessed.
+ * If no siginfo available, zero out the struct in base.
+ */
+ if (info == NULL)
+ memset(signal_base->siginfo[signo], 0, sizeof(*info));
+ else
+ memcpy(signal_base->siginfo[signo], info, sizeof(*info));
+ signal_base->signal_pending[signo] = 1;
+ signal_base->signal_caught = 1;
+
+ /* Wake up the other end of the pipe. */
+ ignore_result(write(signal_base->signal_pipe[1], &ch, 1));
+ }
+}
+
+static int
+sudo_ev_add_signal(struct sudo_event_base *base, struct sudo_event *ev,
+ bool tohead)
+{
+ const int signo = ev->fd;
+ debug_decl(sudo_ev_add_signal, SUDO_DEBUG_EVENT)
+
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ "%s: adding event %p to base %p, signal %d, events %d",
+ __func__, ev, base, signo, ev->events);
+ if (signo >= NSIG) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "%s: signo %d larger than max %d", __func__, signo, NSIG - 1);
+ debug_return_int(-1);
+ }
+ if ((ev->events & ~(SUDO_EV_SIGNAL|SUDO_EV_SIGINFO|SUDO_EV_PERSIST)) != 0) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "%s: invalid event set 0x%x", __func__, ev->events);
+ debug_return_int(-1);
+ }
+
+ /*
+ * Allocate base->siginfo[signo] and base->orig_handlers[signo] as needed.
+ */
+ if (base->siginfo[signo] == NULL) {
+ base->siginfo[signo] = malloc(sizeof(*base->siginfo[signo]));
+ if (base->siginfo[signo] == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "%s: unable to allocate siginfo for signo %d",
+ __func__, signo);
+ debug_return_int(-1);
+ }
+ }
+ if (base->orig_handlers[signo] == NULL) {
+ base->orig_handlers[signo] =
+ malloc(sizeof(*base->orig_handlers[signo]));
+ if (base->orig_handlers[signo] == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "%s: unable to allocate orig_handlers for signo %d",
+ __func__, signo);
+ debug_return_int(-1);
+ }
+ }
+
+ /* Install signal handler as needed, saving the original value. */
+ if (TAILQ_EMPTY(&base->signals[signo])) {
+ struct sigaction sa;
+ memset(&sa, 0, sizeof(sa));
+ sigfillset(&sa.sa_mask);
+ sa.sa_flags = SA_RESTART|SA_SIGINFO;
+ sa.sa_sigaction = sudo_ev_handler;
+ if (sigaction(signo, &sa, base->orig_handlers[signo]) != 0) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "%s: unable to install handler for signo %d", __func__, signo);
+ debug_return_int(-1);
+ }
+ base->num_handlers++;
+ }
+
+ /*
+ * Insert signal event into the proper tail queue.
+ * Signal events are always persistent.
+ */
+ ev->base = base;
+ if (tohead) {
+ TAILQ_INSERT_HEAD(&base->signals[signo], ev, entries);
+ } else {
+ TAILQ_INSERT_TAIL(&base->signals[signo], ev, entries);
+ }
+ SET(ev->events, SUDO_EV_PERSIST);
+ SET(ev->flags, SUDO_EVQ_INSERTED);
+
+ /* Add the internal signal_pipe event on demand. */
+ if (!ISSET(base->signal_event.flags, SUDO_EVQ_INSERTED))
+ sudo_ev_add(base, &base->signal_event, NULL, true);
+
+ /* Update global signal base so handler to update signals_pending[] */
+ signal_base = base;
+
+ debug_return_int(0);
+}
+
+int
+sudo_ev_add_v1(struct sudo_event_base *base, struct sudo_event *ev,
+ struct timeval *timo, bool tohead)
+{
+ struct timespec tsbuf, *ts = NULL;
+
+ if (timo != NULL) {
+ TIMEVAL_TO_TIMESPEC(timo, &tsbuf);
+ ts = &tsbuf;
+ }
+
+ return sudo_ev_add_v2(base, ev, ts, tohead);
+}
+
+int
+sudo_ev_add_v2(struct sudo_event_base *base, struct sudo_event *ev,
+ struct timespec *timo, bool tohead)
+{
+ debug_decl(sudo_ev_add, SUDO_DEBUG_EVENT)
+
+ /* If no base specified, use existing or default base. */
+ if (base == NULL) {
+ if (ev->base != NULL) {
+ base = ev->base;
+ } else if (default_base != NULL) {
+ base = default_base;
+ } else {
+ sudo_debug_printf(SUDO_DEBUG_ERROR, "%s: no base specified",
+ __func__);
+ debug_return_int(-1);
+ }
+ }
+
+ /* Only add new events to the events list. */
+ if (ISSET(ev->flags, SUDO_EVQ_INSERTED)) {
+ /* If event no longer has a timeout, remove from timeouts queue. */
+ if (timo == NULL && ISSET(ev->flags, SUDO_EVQ_TIMEOUTS)) {
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ "%s: removing event %p from timeouts queue", __func__, ev);
+ CLR(ev->flags, SUDO_EVQ_TIMEOUTS);
+ TAILQ_REMOVE(&base->timeouts, ev, timeouts_entries);
+ }
+ } else {
+ /* Special handling for signal events. */
+ if (ev->events & (SUDO_EV_SIGNAL|SUDO_EV_SIGINFO))
+ debug_return_int(sudo_ev_add_signal(base, ev, tohead));
+
+ /* Add event to the base. */
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ "%s: adding event %p to base %p, fd %d, events %d",
+ __func__, ev, base, ev->fd, ev->events);
+ if (ev->events & (SUDO_EV_READ|SUDO_EV_WRITE)) {
+ if (sudo_ev_add_impl(base, ev) != 0)
+ debug_return_int(-1);
+ }
+ ev->base = base;
+ if (tohead) {
+ TAILQ_INSERT_HEAD(&base->events, ev, entries);
+ } else {
+ TAILQ_INSERT_TAIL(&base->events, ev, entries);
+ }
+ SET(ev->flags, SUDO_EVQ_INSERTED);
+ }
+ /* Timeouts can be changed for existing events. */
+ if (timo != NULL) {
+ struct sudo_event *evtmp;
+ if (ISSET(ev->flags, SUDO_EVQ_TIMEOUTS)) {
+ /* Remove from timeouts list, then add back. */
+ TAILQ_REMOVE(&base->timeouts, ev, timeouts_entries);
+ }
+ /* Convert to absolute time and insert in sorted order; O(n). */
+ sudo_gettime_mono(&ev->timeout);
+ sudo_timespecadd(&ev->timeout, timo, &ev->timeout);
+ TAILQ_FOREACH(evtmp, &base->timeouts, timeouts_entries) {
+ if (sudo_timespeccmp(timo, &evtmp->timeout, <))
+ break;
+ }
+ if (evtmp != NULL) {
+ TAILQ_INSERT_BEFORE(evtmp, ev, timeouts_entries);
+ } else {
+ TAILQ_INSERT_TAIL(&base->timeouts, ev, timeouts_entries);
+ }
+ SET(ev->flags, SUDO_EVQ_TIMEOUTS);
+ }
+ debug_return_int(0);
+}
+
+/*
+ * Remove an event from the base, if specified, or the base embedded
+ * in the event if not. Note that there are multiple tail queues.
+ */
+int
+sudo_ev_del_v1(struct sudo_event_base *base, struct sudo_event *ev)
+{
+ debug_decl(sudo_ev_del, SUDO_DEBUG_EVENT)
+
+ /* Make sure event is really in the queue. */
+ if (!ISSET(ev->flags, SUDO_EVQ_INSERTED)) {
+ sudo_debug_printf(SUDO_DEBUG_INFO, "%s: event %p not in queue",
+ __func__, ev);
+ debug_return_int(0);
+ }
+
+ /* Check for event base mismatch, if one is specified. */
+ if (base == NULL) {
+ if (ev->base == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR, "%s: no base specified",
+ __func__);
+ debug_return_int(-1);
+ }
+ base = ev->base;
+ } else if (base != ev->base) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR, "%s: mismatch base %p, ev->base %p",
+ __func__, base, ev->base);
+ debug_return_int(-1);
+ }
+
+ if (ev->events & (SUDO_EV_SIGNAL|SUDO_EV_SIGINFO)) {
+ const int signo = ev->fd;
+
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ "%s: removing event %p from base %p, signo %d, events %d",
+ __func__, ev, base, signo, ev->events);
+
+ /* Unlink from signal event list. */
+ TAILQ_REMOVE(&base->signals[signo], ev, entries);
+ if (TAILQ_EMPTY(&base->signals[signo])) {
+ if (sigaction(signo, base->orig_handlers[signo], NULL) != 0) {
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+ "%s: unable to restore handler for signo %d",
+ __func__, signo);
+ debug_return_int(-1);
+ }
+ base->num_handlers--;
+ }
+ if (base->num_handlers == 0) {
+ /* No registered signal events, remove internal event. */
+ sudo_ev_del(base, &base->signal_event);
+ }
+ } else {
+ sudo_debug_printf(SUDO_DEBUG_INFO,
+ "%s: removing event %p from base %p, fd %d, events %d",
+ __func__, ev, base, ev->fd, ev->events);
+
+ /* Call backend. */
+ if (ev->events & (SUDO_EV_READ|SUDO_EV_WRITE)) {
+ if (sudo_ev_del_impl(base, ev) != 0)
+ debug_return_int(-1);
+ }
+
+ /* Unlink from event list. */
+ TAILQ_REMOVE(&base->events, ev, entries);
+
+ /* Unlink from timeouts list. */
+ if (ISSET(ev->flags, SUDO_EVQ_TIMEOUTS))
+ TAILQ_REMOVE(&base->timeouts, ev, timeouts_entries);
+ }
+
+ /* Unlink from active list. */
+ if (ISSET(ev->flags, SUDO_EVQ_ACTIVE))
+ TAILQ_REMOVE(&base->active, ev, active_entries);
+
+ /* Mark event unused. */
+ ev->flags = 0;
+ ev->pfd_idx = -1;
+
+ debug_return_int(0);
+}
+
+int
+sudo_ev_dispatch_v1(struct sudo_event_base *base)
+{
+ return sudo_ev_loop_v1(base, 0);
+}
+
+/*
+ * Run main event loop.
+ * Returns 0 on success, 1 if no events registered and -1 on error
+ */
+int
+sudo_ev_loop_v1(struct sudo_event_base *base, int flags)
+{
+ struct timespec now;
+ struct sudo_event *ev;
+ int nready, rc = 0;
+ debug_decl(sudo_ev_loop, SUDO_DEBUG_EVENT)
+
+ /*
+ * If sudo_ev_loopexit() was called when events were not running
+ * the next invocation of sudo_ev_loop() only runs once.
+ * All other base flags are ignored unless we are running events.
+ * Note that SUDO_EVLOOP_ONCE and SUDO_EVBASE_LOOPONCE are equivalent.
+ */
+ base->flags |= (flags & SUDO_EVLOOP_ONCE);
+ base->flags &= (SUDO_EVBASE_LOOPEXIT|SUDO_EVBASE_LOOPONCE);
+
+ for (;;) {
+rescan:
+ /* Make sure we have some events. */
+ if (TAILQ_EMPTY(&base->events)) {
+ rc = 1;
+ break;
+ }
+
+ /* Call backend to scan for I/O events. */
+ TAILQ_INIT(&base->active);
+ nready = sudo_ev_scan_impl(base, flags);
+ switch (nready) {
+ case -1:
+ if (errno == ENOMEM)
+ continue;
+ if (errno == EINTR) {
+ /* Interrupted by signal, check for sigevents. */
+ if (base->signal_caught) {
+ signal_pipe_cb(base->signal_pipe[0], SUDO_EV_READ, base);
+ break;
+ }
+ continue;
+ }
+ rc = -1;
+ goto done;
+ case 0:
+ /* Timed out, activate timeout events. */
+ sudo_gettime_mono(&now);
+ while ((ev = TAILQ_FIRST(&base->timeouts)) != NULL) {
+ if (sudo_timespeccmp(&ev->timeout, &now, >))
+ break;
+ /* Remove from timeouts list. */
+ CLR(ev->flags, SUDO_EVQ_TIMEOUTS);
+ TAILQ_REMOVE(&base->timeouts, ev, timeouts_entries);
+ /* Make event active. */
+ ev->revents = SUDO_EV_TIMEOUT;
+ TAILQ_INSERT_TAIL(&base->active, ev, active_entries);
+ SET(ev->flags, SUDO_EVQ_ACTIVE);
+ }
+ if (ISSET(flags, SUDO_EVLOOP_NONBLOCK)) {
+ /* If nonblocking, return immediately if no active events. */
+ if (TAILQ_EMPTY(&base->active))
+ goto done;
+ }
+ break;
+ default:
+ /* I/O events active, sudo_ev_scan_impl() already added them. */
+ break;
+ }
+
+ /*
+ * Service each event in the active queue.
+ * We store the current event pointer in the base so that
+ * it can be cleared by sudo_ev_del(). This prevents a use
+ * after free if the callback frees its own event.
+ */
+ while ((ev = TAILQ_FIRST(&base->active)) != NULL) {
+ /* Pop first event off the active queue. */
+ sudo_ev_deactivate(base, ev);
+ /* Remove from base unless persistent. */
+ if (!ISSET(ev->events, SUDO_EV_PERSIST))
+ sudo_ev_del(base, ev);
+ ev->callback(ev->fd, ev->revents,
+ ev->closure == sudo_ev_self_cbarg() ? ev : ev->closure);
+ if (ISSET(base->flags, SUDO_EVBASE_LOOPBREAK)) {
+ /* Stop processing events immediately. */
+ SET(base->flags, SUDO_EVBASE_GOT_BREAK);
+ sudo_ev_deactivate_all(base);
+ goto done;
+ }
+ if (ISSET(base->flags, SUDO_EVBASE_LOOPCONT)) {
+ /* Rescan events and start polling again. */
+ CLR(base->flags, SUDO_EVBASE_LOOPCONT);
+ sudo_ev_deactivate_all(base);
+ goto rescan;
+ }
+ }
+ if (ISSET(base->flags, SUDO_EVBASE_LOOPONCE)) {
+ /* SUDO_EVBASE_LOOPEXIT is always set w/ SUDO_EVBASE_LOOPONCE */
+ if (ISSET(base->flags, SUDO_EVBASE_LOOPEXIT))
+ SET(base->flags, SUDO_EVBASE_GOT_EXIT);
+ sudo_ev_deactivate_all(base);
+ break;
+ }
+ }
+done:
+ base->flags &= SUDO_EVBASE_GOT_MASK;
+ debug_return_int(rc);
+}
+
+void
+sudo_ev_loopexit_v1(struct sudo_event_base *base)
+{
+ debug_decl(sudo_ev_loopexit, SUDO_DEBUG_EVENT)
+ /* SUDO_EVBASE_LOOPBREAK trumps SUDO_EVBASE_LOOPEXIT */
+ if (!ISSET(base->flags, SUDO_EVBASE_LOOPBREAK)) {
+ /* SUDO_EVBASE_LOOPEXIT trumps SUDO_EVBASE_LOOPCONT */
+ CLR(base->flags, SUDO_EVBASE_LOOPCONT);
+ SET(base->flags, (SUDO_EVBASE_LOOPEXIT|SUDO_EVBASE_LOOPONCE));
+ }
+ debug_return;
+}
+
+void
+sudo_ev_loopbreak_v1(struct sudo_event_base *base)
+{
+ debug_decl(sudo_ev_loopbreak, SUDO_DEBUG_EVENT)
+ /* SUDO_EVBASE_LOOPBREAK trumps SUDO_EVBASE_LOOP{CONT,EXIT,ONCE}. */
+ CLR(base->flags, (SUDO_EVBASE_LOOPCONT|SUDO_EVBASE_LOOPEXIT|SUDO_EVBASE_LOOPONCE));
+ SET(base->flags, SUDO_EVBASE_LOOPBREAK);
+ debug_return;
+}
+
+void
+sudo_ev_loopcontinue_v1(struct sudo_event_base *base)
+{
+ debug_decl(sudo_ev_loopcontinue, SUDO_DEBUG_EVENT)
+ /* SUDO_EVBASE_LOOP{BREAK,EXIT} trumps SUDO_EVBASE_LOOPCONT */
+ if (!ISSET(base->flags, SUDO_EVBASE_LOOPONCE|SUDO_EVBASE_LOOPBREAK)) {
+ SET(base->flags, SUDO_EVBASE_LOOPCONT);
+ }
+ debug_return;
+}
+
+bool
+sudo_ev_got_exit_v1(struct sudo_event_base *base)
+{
+ debug_decl(sudo_ev_got_exit, SUDO_DEBUG_EVENT)
+ debug_return_bool(ISSET(base->flags, SUDO_EVBASE_GOT_EXIT));
+}
+
+bool
+sudo_ev_got_break_v1(struct sudo_event_base *base)
+{
+ debug_decl(sudo_ev_got_break, SUDO_DEBUG_EVENT)
+ debug_return_bool(ISSET(base->flags, SUDO_EVBASE_GOT_BREAK));
+}
+
+int
+sudo_ev_get_timeleft_v1(struct sudo_event *ev, struct timeval *tv)
+{
+ struct timespec ts;
+ int ret;
+
+ ret = sudo_ev_get_timeleft_v2(ev, &ts);
+ TIMESPEC_TO_TIMEVAL(tv, &ts);
+
+ return ret;
+}
+
+int
+sudo_ev_get_timeleft_v2(struct sudo_event *ev, struct timespec *ts)
+{
+ struct timespec now;
+ debug_decl(sudo_ev_get_timeleft, SUDO_DEBUG_EVENT)
+
+ if (!ISSET(ev->flags, SUDO_EVQ_TIMEOUTS)) {
+ sudo_timespecclear(ts);
+ debug_return_int(-1);
+ }
+
+ sudo_gettime_mono(&now);
+ sudo_timespecsub(&ev->timeout, &now, ts);
+ if (ts->tv_sec < 0)
+ sudo_timespecclear(ts);
+ debug_return_int(0);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-21 17:45:26 +0000