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Merge branch 'bug5084_squashed'

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This commit is contained in:
Nick Mathewson 2012-02-12 23:32:53 -05:00
commit 15309cbc49
2 changed files with 59 additions and 12 deletions
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4
changes/bug5084 Normal file
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@ -0,0 +1,4 @@
o Major bugfixes:
- Avoid a crash when managed proxies are configured and we receive
HUP signals or configuration values too rapidly. Fixes bug 5084;
bugfix on 0.2.3.6-alpha.

63
src/or/transports.c
View File

@ -140,12 +140,35 @@ static INLINE void free_execve_args(char **arg);
static smartlist_t *managed_proxy_list = NULL;
/** Number of still unconfigured proxies. */
static int unconfigured_proxies_n = 0;
/** Boolean: True iff we might need to restart some proxies. */
static int check_if_restarts_needed = 0;
/** Return true if there are still unconfigured managed proxies. */
/** Return true if there are still unconfigured managed proxies, or proxies
* that need restarting. */
int
pt_proxies_configuration_pending(void)
{
return !! unconfigured_proxies_n;
return unconfigured_proxies_n || check_if_restarts_needed;
}
/** Assert that the unconfigured_proxies_n value correctly matches the number
* of proxies in a state other than PT_PROTO_COMPLETE. */
static void
assert_unconfigured_count_ok(void)
{
int n_completed = 0;
if (!managed_proxy_list) {
tor_assert(unconfigured_proxies_n == 0);
return;
}
SMARTLIST_FOREACH(managed_proxy_list, managed_proxy_t *, mp, {
if (mp->conf_state == PT_PROTO_COMPLETED)
++n_completed;
});
tor_assert(n_completed + unconfigured_proxies_n ==
smartlist_len(managed_proxy_list));
}
/** Return true if <b>mp</b> has the same argv as <b>proxy_argv</b> */
@ -255,6 +278,7 @@ proxy_prepare_for_restart(managed_proxy_t *mp)
/* flag it as an infant proxy so that it gets launched on next tick */
mp->conf_state = PT_PROTO_INFANT;
unconfigured_proxies_n++;
}
/** Launch managed proxy <b>mp</b>. */
@ -316,9 +340,18 @@ launch_managed_proxy(managed_proxy_t *mp)
void
pt_configure_remaining_proxies(void)
{
smartlist_t *tmp = smartlist_new();
log_debug(LD_CONFIG, "Configuring remaining managed proxies (%d)!",
unconfigured_proxies_n);
SMARTLIST_FOREACH_BEGIN(managed_proxy_list, managed_proxy_t *, mp) {
/* Iterate over tmp, not managed_proxy_list, since configure_proxy can
* remove elements from managed_proxy_list. */
smartlist_add_all(tmp, managed_proxy_list);
assert_unconfigured_count_ok();
SMARTLIST_FOREACH_BEGIN(tmp, managed_proxy_t *, mp) {
tor_assert(mp->conf_state != PT_PROTO_BROKEN ||
mp->conf_state != PT_PROTO_FAILED_LAUNCH);
@ -330,12 +363,9 @@ pt_configure_remaining_proxies(void)
if (proxy_needs_restart(mp)) {
log_info(LD_GENERAL, "Preparing managed proxy for restart.");
proxy_prepare_for_restart(mp);
continue;
} else { /* it doesn't need to be restarted. */
log_info(LD_GENERAL, "Nothing changed for managed proxy after HUP: "
"not restarting.");
unconfigured_proxies_n--;
tor_assert(unconfigured_proxies_n >= 0);
}
continue;
@ -347,6 +377,10 @@ pt_configure_remaining_proxies(void)
configure_proxy(mp);
} SMARTLIST_FOREACH_END(mp);
smartlist_free(tmp);
check_if_restarts_needed = 0;
assert_unconfigured_count_ok();
}
#ifdef _WIN32
@ -1125,6 +1159,8 @@ managed_proxy_create(const smartlist_t *transport_list,
smartlist_add(managed_proxy_list, mp);
unconfigured_proxies_n++;
assert_unconfigured_count_ok();
return mp;
}
@ -1154,7 +1190,7 @@ pt_kickstart_proxy(const smartlist_t *transport_list,
it. */
if (mp->marked_for_removal) {
mp->marked_for_removal = 0;
unconfigured_proxies_n++;
check_if_restarts_needed = 1;
}
SMARTLIST_FOREACH_BEGIN(transport_list, const char *, transport) {
@ -1193,9 +1229,11 @@ pt_prepare_proxy_list_for_config_read(void)
if (!managed_proxy_list)
return;
assert_unconfigured_count_ok();
SMARTLIST_FOREACH_BEGIN(managed_proxy_list, managed_proxy_t *, mp) {
/* Destroy unconfigured proxies. */
if (mp->conf_state != PT_PROTO_COMPLETED) {
SMARTLIST_DEL_CURRENT(managed_proxy_list, mp);
managed_proxy_destroy(mp, 1);
unconfigured_proxies_n--;
continue;
@ -1209,6 +1247,8 @@ pt_prepare_proxy_list_for_config_read(void)
smartlist_clear(mp->transports_to_launch);
} SMARTLIST_FOREACH_END(mp);
assert_unconfigured_count_ok();
tor_assert(unconfigured_proxies_n == 0);
}
@ -1221,13 +1261,14 @@ sweep_proxy_list(void)
{
if (!managed_proxy_list)
return;
assert_unconfigured_count_ok();
SMARTLIST_FOREACH_BEGIN(managed_proxy_list, managed_proxy_t *, mp) {
if (mp->marked_for_removal) {
SMARTLIST_DEL_CURRENT(managed_proxy_list, mp);
managed_proxy_destroy(mp, 1);
}
} SMARTLIST_FOREACH_END(mp);
assert_unconfigured_count_ok();
}
/** Release all storage held by the pluggable transports subsystem. */
@ -1239,8 +1280,10 @@ pt_free_all(void)
transports and it's the duty of the circuitbuild.c subsystem to
free them. Otherwise, it hasn't registered its transports yet
and we should free them here. */
SMARTLIST_FOREACH(managed_proxy_list, managed_proxy_t *, mp,
managed_proxy_destroy(mp, 1));
SMARTLIST_FOREACH(managed_proxy_list, managed_proxy_t *, mp, {
SMARTLIST_DEL_CURRENT(managed_proxy_list, mp);
managed_proxy_destroy(mp, 1);
});
smartlist_free(managed_proxy_list);
managed_proxy_list=NULL;