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first cut at a workaround for the reachability bug: explicitly find a

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server running the right version, if we can, and ask for that one.


svn:r6616
This commit is contained in:
Roger Dingledine 2006-06-13 10:25:22 +00:00
parent 31b51849b5
commit 23e2c6a7dd
1 changed files with 46 additions and 2 deletions
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48
src/or/circuitbuild.c
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@ -1457,6 +1457,46 @@ onion_append_to_cpath(crypt_path_t **head_ptr, crypt_path_t *new_hop)
}
}
/** Pick a random server digest that's running a Tor version that
* doesn't have the reachability bug. These are versions 0.1.1.22+
* and 0.1.2.1-alpha+.
*
* We only return one, so this doesn't become stupid when the
* whole network has upgraded. */
static char *
compute_preferred_testing_list(const char *answer)
{
smartlist_t *choices;
routerlist_t *rl = router_get_routerlist();
routerinfo_t *router;
char *s;
if (answer) /* they have one in mind -- easy */
return tor_strdup(answer);
choices = smartlist_create();
/* now count up our choices */
SMARTLIST_FOREACH(rl->routers, routerinfo_t *, r,
if (r->is_running && r->is_valid &&
((tor_version_as_new_as(r->platform,"0.1.1.21-cvs") &&
!tor_version_as_new_as(r->platform,"0.1.2.0-alpha-cvs")) ||
tor_version_as_new_as(r->platform,"0.1.2.1-alpha")))
smartlist_add(choices, r));
router = smartlist_choose(choices);
smartlist_free(choices);
if (!router) {
log_info(LD_CIRC, "Looking for middle server that doesn't have the "
"reachability bug, but didn't find one. Oh well.");
return NULL;
}
log_info(LD_CIRC, "Looking for middle server that doesn't have the "
"reachability bug, and chose '%s'. Great.", router->nickname);
s = tor_malloc(HEX_DIGEST_LEN+1);
base16_encode(s, HEX_DIGEST_LEN+1,
router->cache_info.identity_digest, DIGEST_LEN);
return s;
}
/** A helper function used by onion_extend_cpath(). Use <b>purpose</b>
* and <b>state</b> and the cpath <b>head</b> (currently populated only
* to length <b>cur_len</b> to decide a suitable middle hop for a
@ -1474,6 +1514,7 @@ choose_good_middle_server(uint8_t purpose,
crypt_path_t *cpath;
smartlist_t *excluded;
or_options_t *options = get_options();
char *preferred = NULL;
tor_assert(_CIRCUIT_PURPOSE_MIN <= purpose &&
purpose <= _CIRCUIT_PURPOSE_MAX);
@ -1493,11 +1534,14 @@ choose_good_middle_server(uint8_t purpose,
routerlist_add_family(excluded, r);
}
}
choice = router_choose_random_node(
purpose == CIRCUIT_PURPOSE_TESTING ? options->TestVia : NULL,
if (purpose == CIRCUIT_PURPOSE_TESTING)
preferred = compute_preferred_testing_list(options->TestVia);
choice = router_choose_random_node(preferred,
options->ExcludeNodes, excluded,
state->need_uptime, state->need_capacity, 0,
options->_AllowInvalid & ALLOW_INVALID_MIDDLE, 0);
if (preferred)
tor_free(preferred);
smartlist_free(excluded);
return choice;
}