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Extract a function for one-time-only pre-reversible options.

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These changes _only_ happen at startup, and happen before _any_
reversible option change is set.
This commit is contained in:
Nick Mathewson 2019-11-07 12:47:20 -05:00
parent effed7fb1c
commit 006ce47ffa
1 changed files with 64 additions and 45 deletions
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109
src/app/config/config.c
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@ -904,8 +904,8 @@ static smartlist_t *configured_ports = NULL;
/** True iff we're currently validating options, and any calls to
* get_options() are likely to be bugs. */
static int in_option_validation = 0;
/* True iff we've initialized libevent */
static int libevent_initialized = 0;
/** True iff we have run options_act_once_on_startup() */
static bool have_set_startup_options = false;
/* A global configuration manager to handle all configuration objects. */
static config_mgr_t *options_mgr = NULL;
@ -1085,7 +1085,7 @@ config_free_all(void)
cleanup_protocol_warning_severity_level();
libevent_initialized = 0;
have_set_startup_options = false;
config_mgr_free(options_mgr);
}
@ -1422,6 +1422,65 @@ create_keys_directory(const or_options_t *options)
/* Helps determine flags to pass to switch_id. */
static int have_low_ports = -1;
/** Take case of initial startup tasks that must occur before any of the
* transactional option-related changes are allowed. */
static int
options_act_once_on_startup(char **msg_out)
{
if (have_set_startup_options)
return 0;
const or_options_t *options = get_options();
int running_tor = options->command == CMD_RUN_TOR;
if (!running_tor)
return 0;
/* Daemonize _first_, since we only want to open most of this stuff in
* the subprocess. Libevent bases can't be reliably inherited across
* processes. */
if (options->RunAsDaemon) {
if (! start_daemon_has_been_called())
subsystems_prefork();
/* No need to roll back, since you can't change the value. */
if (start_daemon())
subsystems_postfork();
}
#ifdef HAVE_SYSTEMD
/* Our PID may have changed, inform supervisor */
sd_notifyf(0, "MAINPID=%ld\n", (long int)getpid());
#endif
/* Set up libevent. (We need to do this before we can register the
* listeners as listeners.) */
init_libevent(options);
/* This has to come up after libevent is initialized. */
control_initialize_event_queue();
/*
* Initialize the scheduler - this has to come after
* options_init_from_torrc() sets up libevent - why yes, that seems
* completely sensible to hide the libevent setup in the option parsing
* code! It also needs to happen before init_keys(), so it needs to
* happen here too. How yucky. */
scheduler_init();
/* Attempt to lock all current and future memory with mlockall() only once.
* This must happen before setuid. */
if (options->DisableAllSwap) {
if (tor_mlockall() == -1) {
*msg_out = tor_strdup("DisableAllSwap failure. Do you have proper "
"permissions?");
return -1;
}
}
have_set_startup_options = true;
return 0;
}
/** Fetch the active option list, and take actions based on it. All of the
* things we do should survive being done repeatedly. If present,
* <b>old_options</b> contains the previous value of the options.
@ -1439,21 +1498,8 @@ options_act_reversible,(const or_options_t *old_options, char **msg))
int logs_marked = 0, logs_initialized = 0;
int old_min_log_level = get_min_log_level();
/* Daemonize _first_, since we only want to open most of this stuff in
* the subprocess. Libevent bases can't be reliably inherited across
* processes. */
if (running_tor && options->RunAsDaemon) {
if (! start_daemon_has_been_called())
subsystems_prefork();
/* No need to roll back, since you can't change the value. */
if (start_daemon())
subsystems_postfork();
}
#ifdef HAVE_SYSTEMD
/* Our PID may have changed, inform supervisor */
sd_notifyf(0, "MAINPID=%ld\n", (long int)getpid());
#endif
if (options_act_once_on_startup(msg) < 0)
goto rollback;
if (running_tor) {
int n_ports=0;
@ -1471,24 +1517,6 @@ options_act_reversible,(const or_options_t *old_options, char **msg))
options->ConnLimit_ = old_options->ConnLimit_;
}
/* Set up libevent. (We need to do this before we can register the
* listeners as listeners.) */
if (running_tor && !libevent_initialized) {
init_libevent(options);
libevent_initialized = 1;
/* This has to come up after libevent is initialized. */
control_initialize_event_queue();
/*
* Initialize the scheduler - this has to come after
* options_init_from_torrc() sets up libevent - why yes, that seems
* completely sensible to hide the libevent setup in the option parsing
* code! It also needs to happen before init_keys(), so it needs to
* happen here too. How yucky. */
scheduler_init();
}
/* Adjust the port configuration so we can launch listeners. */
/* 31851: some ports are relay-only */
if (parse_ports(options, 0, msg, &n_ports, NULL)) {
@ -1533,15 +1561,6 @@ options_act_reversible,(const or_options_t *old_options, char **msg))
}
#endif /* defined(HAVE_NET_IF_H) && defined(HAVE_NET_PFVAR_H) */
/* Attempt to lock all current and future memory with mlockall() only once */
if (options->DisableAllSwap) {
if (tor_mlockall() == -1) {
*msg = tor_strdup("DisableAllSwap failure. Do you have proper "
"permissions?");
goto done;
}
}
/* Setuid/setgid as appropriate */
if (options->User) {
tor_assert(have_low_ports != -1);