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Be more aggressive about throwing away expired router descriptors: they are of no use to anybody. Better still: dont serve expired descriptors by fingerprint. The only people who ask for them are busted 0.1.1.10 Tors that will throw them away and re-request them after 30 minutes.

Browse Source 
svn:r5762
This commit is contained in:
Nick Mathewson 2006-01-10 04:57:12 +00:00
parent 56c55c343e
commit 43a4f8c7f3
3 changed files with 33 additions and 12 deletions
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7
src/or/dirserv.c
View File

@ -1603,6 +1603,7 @@ dirserv_get_routerdescs(smartlist_t *descs_out, const char *key,
smartlist_free(digests);
} else if (!strcmpstart(key, "/tor/server/fp/")) {
smartlist_t *digests = smartlist_create();
time_t cutoff = time(NULL) - ROUTER_MAX_AGE;
key += strlen("/tor/server/fp/");
dir_split_resource_into_fingerprints(key, digests, NULL, 1);
SMARTLIST_FOREACH(digests, const char *, d,
@ -1611,7 +1612,11 @@ dirserv_get_routerdescs(smartlist_t *descs_out, const char *key,
smartlist_add(descs_out, &(router_get_my_routerinfo()->cache_info));
} else {
routerinfo_t *ri = router_get_by_digest(d);
if (ri)
/* Don't actually serve a descriptor that everyone will think is
* expired. This is an (ugly) workaround to keep buggy 0.1.1.10
* Tors from downloading descriptors that they will throw away.
*/
if (ri && ri->cache_info.published_on > cutoff)
smartlist_add(descs_out, &(ri->cache_info));
}
});

2
src/or/or.h
View File

@ -191,7 +191,7 @@
/** How old do we allow a router to get before removing it
* from the router list? In seconds. */
#define ROUTER_MAX_AGE (60*60*24)
/** How old do we let a saved descriptor get before removing it it? */
/** How old do we let a saved descriptor get before removing it? */
#define OLD_ROUTER_DESC_MAX_AGE (60*60*48)
typedef enum {

36
src/or/routerlist.c
View File

@ -286,13 +286,15 @@ router_reload_router_list(void)
}
tor_free(fname);
/* Don't cache expired routers. */
routerlist_remove_old_routers();
if (router_journal_len) {
/* Always clear the journal on startup.*/
router_rebuild_store(1);
} else {
/* Don't cache expired routers. (This is in an else because
* router_rebuild_store() also calls remove_old_routers().) */
routerlist_remove_old_routers();
}
return 0;
}
@ -1750,8 +1752,9 @@ routerlist_remove_old_routers(void)
{
int i, hi=-1;
const char *cur_id = NULL;
time_t cutoff;
time_t now, cutoff;
routerinfo_t *router;
signed_descriptor_t *sd;
digestmap_t *retain;
or_options_t *options = get_options();
if (!routerlist || !networkstatus_list)
@ -1766,8 +1769,9 @@ routerlist_remove_old_routers(void)
});
}
cutoff = time(NULL) - ROUTER_MAX_AGE;
/* Remove old members of routerlist->routers. */
now = time(NULL);
cutoff = now - ROUTER_MAX_AGE;
/* Remove too-old members of routerlist->routers. */
for (i = 0; i < smartlist_len(routerlist->routers); ++i) {
router = smartlist_get(routerlist->routers, i);
if (router->cache_info.published_on <= cutoff &&
@ -1779,10 +1783,22 @@ routerlist_remove_old_routers(void)
}
}
/* Now we're looking at routerlist->old_routers. First, check whether
* we have too many router descriptors, total. We're okay with having too
* many for some given router, so long as the total number doesn't approach
* MAX_DESCRIPTORS_PER_ROUTER*len(router).
/* Remove far-too-old members of routerlist->old_routers. */
cutoff = now - OLD_ROUTER_DESC_MAX_AGE;
for (i = 0; i < smartlist_len(routerlist->old_routers); ++i) {
sd = smartlist_get(routerlist->old_routers, i);
if (sd->published_on <= cutoff &&
!digestmap_get(retain, sd->signed_descriptor_digest)) {
/* Too old. Remove it. */
routerlist_remove_old(routerlist, sd, i--);
}
}
/* Now we're looking at routerlist->old_routers for extraneous
* members. (We'd keep all the members if we could, but we'd like to save
* space.) First, check whether we have too many router descriptors, total.
* We're okay with having too many for some given router, so long as the
* total number doesn't approach MAX_DESCRIPTORS_PER_ROUTER*len(router).
*/
if (smartlist_len(routerlist->old_routers) <
smartlist_len(routerlist->routers) * (MAX_DESCRIPTORS_PER_ROUTER - 1))