1 /*
2 * run_tlsdate.c - events for running tlsdate
3 * Copyright (c) 2013 The Chromium Authors. All rights reserved.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "config.h"
9
10 #include <event2/event.h>
11
12 #include "src/conf.h"
13 #include "src/dbus.h"
14 #include "src/util.h"
15 #include "src/tlsdate.h"
16
17 /* TODO(wad) split out backoff logic to make this testable */
action_run_tlsdate(evutil_socket_t fd,short what,void * arg)18 void action_run_tlsdate (evutil_socket_t fd, short what, void *arg)
19 {
20 struct state *state = arg;
21 verb_debug ("[event:%s] fired", __func__);
22 if (state->last_sync_type == SYNC_TYPE_NET)
23 {
24 verb ("[event:%s] called, but network time isn't needed",
25 __func__);
26 return;
27 }
28 state->resolving = 0;
29 if (state->running)
30 {
31 /* It's possible that a network or proxy change occurred during a call. If
32 * the call succeeded, it doesn't matter. If the call fails, reissuing
33 * the attempt with the new configuration has a chance of succeeding. To
34 * avoid missing a retry, we decrement the try count and reset the
35 * backoff.
36 */
37 if (state->tries > 0)
38 {
39 state->tries--;
40 /* TODO(wad) Make a shorter retry constant for this. */
41 state->backoff = state->opts.wait_between_tries;
42 }
43 info ("[event:%s] requested re-run of tlsdate while tlsdate is running",
44 __func__);
45 return;
46 }
47 /* Enforce maximum retries here instead of in sigchld.c */
48 if (state->tries < state->opts.max_tries)
49 {
50 state->tries++;
51 }
52 else
53 {
54 state->tries = 0;
55 state->backoff = state->opts.wait_between_tries;
56 error ("[event:%s] tlsdate tried and failed to get the time", __func__);
57 return;
58 }
59 state->running = 1;
60 verb ("[event:%s] attempt %d backoff %d", __func__,
61 state->tries, state->backoff);
62 /* Setup a timeout before killing tlsdate */
63 trigger_event (state, E_TLSDATE_TIMEOUT,
64 state->opts.subprocess_wait_between_tries);
65 /* Add the response listener event */
66 trigger_event (state, E_TLSDATE_STATUS, -1);
67 /* Fire off the child process now! */
68 if (tlsdate (state))
69 {
70 /* TODO(wad) Should this be fatal? */
71 error ("[event:%s] tlsdate failed to launch!", __func__);
72 state->running = 0;
73 state->tries = 0;
74 event_del (state->events[E_TLSDATE_TIMEOUT]);
75 return;
76 }
77 }
78