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/* connection events, for libreswan
*
* Copyright (C) 2023 Andrew Cagney
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "enum_names.h"
#include "defs.h"
#include "log.h"
#include "server.h"
#include "connections.h"
#include "connection_event.h"
#include "revival.h" /* for revive_connection() */
#include "list_entry.h"
#include "iface.h" /* for struct iface_endpoint */
static void connection_event_handler(void *arg, const struct timer_event *event);
struct connection_event {
enum connection_event_kind kind;
struct connection *connection;
const char *subplot;
struct timeout *timeout;
struct logger *logger;
};
static void jam_connection_event(struct jambuf *buf, const struct connection_event *event)
{
const struct connection *c = event->connection;
/* currently only one */
jam_string(buf, " ");
jam_enum_short(buf, &connection_event_kind_names, event->kind);
switch (event->kind) {
case CONNECTION_REVIVAL:
if (c->redirect.attempt > 0) {
jam_string(buf, "; redirect");
jam(buf, " attempt %u", c->redirect.attempt);
jam_string(buf, " from ");
jam_address_sensitive(buf, &c->redirect.old_gw_address);
jam_string(buf, " to ");
jam_address_sensitive(buf, &c->redirect.ip);
}
if (c->revival.attempt > 0) {
jam(buf, "; attempt %u", c->revival.attempt);
jam_string(buf, " next in ");
jam_deltatime(buf, c->revival.delay);
jam_string(buf, "s");
if (c->revival.remote.is_set) {
jam_string(buf, " to ");
jam_endpoint_sensitive(buf, &c->revival.remote);
}
if (c->revival.local != NULL) {
jam_string(buf, " via ");
jam_endpoint_sensitive(buf, &c->revival.local->local_endpoint);
}
}
break;
}
jam_string(buf, "; ");
jam_string(buf, event->subplot);
}
void schedule_connection_event(struct connection *c,
enum connection_event_kind event_kind,
const char *subplot,
deltatime_t delay,
const char *impair, struct logger *logger)
{
struct connection_event *d = alloc_thing(struct connection_event, "data");
connection_buf cb;
enum_buf kb;
d->logger = string_logger(HERE, "event %s for "PRI_CONNECTION,
str_enum(&connection_event_kind_names, event_kind, &kb),
pri_connection(c, &cb));
d->kind = event_kind;
d->subplot = subplot;
d->connection = connection_addref(c, d->logger);
c->events[event_kind] = d;
if (impair != NULL) {
llog(RC_LOG, logger,
"IMPAIR: %s: skip scheduling %s event",
impair, impair);
return;
}
schedule_timeout(str_enum(&connection_event_kind_names, event_kind, &kb),
&d->timeout, delay,
connection_event_handler, d);
}
static void discard_connection_event(struct connection_event **e)
{
/*
* When impaired, .timeout is NULL but destroy_timeout()
* handles that.
*/
destroy_timeout(&(*e)->timeout);
connection_delref(&(*e)->connection, (*e)->logger);
free_logger(&(*e)->logger, HERE);
pfree(*e);
*e = NULL;
}
static void delete_connection_event(struct connection_event **e)
{
discard_connection_event(e);
}
static void dispatch_connection_event(struct connection_event *e,
const threadtime_t *inception)
{
ldbg(e->logger, "dispatching");
/* make it invisible */
e->connection->events[e->kind] = NULL;
switch (e->kind) {
case CONNECTION_REVIVAL:
revive_connection(e->connection, e->subplot, inception);
break;
}
discard_connection_event(&e);
}
void connection_event_handler(void *arg, const struct timer_event *event)
{
dispatch_connection_event(arg, &event->inception);
}
void whack_impair_call_connection_event_handler(struct connection *c,
enum connection_event_kind event_kind,
struct logger *logger)
{
struct connection_event *event = c->events[event_kind];
if (event != NULL) {
threadtime_t inception = threadtime_start();
LLOG_JAMBUF(RC_LOG, logger, buf) {
jam_string(buf, "IMPAIR: dispatch");
jam_connection_event(buf, event);
}
/* dispatch will delete */
dispatch_connection_event(event, &inception);
return;
}
enum_buf eb;
llog(RC_LOG, logger, "IMPAIR: no %s event for connection found",
str_enum_short(&connection_event_kind_names, event_kind, &eb));
}
bool connection_event_is_scheduled(const struct connection *c,
enum connection_event_kind event)
{
return (c->events[event] != NULL);
}
bool flush_connection_event(struct connection *c,
enum connection_event_kind event_kind)
{
if (c->events[event_kind] != NULL) {
delete_connection_event(&c->events[event_kind]);
return true;
}
return false;
}
bool flush_connection_events(struct connection *c)
{
bool flushed = false;
for (enum connection_event_kind e = 0; e < CONNECTION_EVENT_KIND_ROOF; e++) {
flushed |= flush_connection_event(c, e);
}
return flushed;
}
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