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Make directory download code slightly less likely to segfault or assert.

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svn:r4929
This commit is contained in:
Nick Mathewson 2005-09-08 16:18:28 +00:00
parent 022f23249f
commit 3a99927859
2 changed files with 8 additions and 4 deletions
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4
src/or/directory.c
View File

@ -170,6 +170,8 @@ directory_get_from_dirserver(uint8_t purpose, const char *resource,
int priv = purpose_is_private(purpose);
int need_v1_support = purpose == DIR_PURPOSE_FETCH_DIR ||
purpose == DIR_PURPOSE_FETCH_RUNNING_LIST;
int need_v2_support = purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS ||
purpose == DIR_PURPOSE_FETCH_SERVERDESC;
if (directconn) {
if (fetch_fresh_first && purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS &&
@ -186,7 +188,7 @@ directory_get_from_dirserver(uint8_t purpose, const char *resource,
}
if (!ds) {
/* anybody with a non-zero dirport will do */
r = router_pick_directory_server(1, fascistfirewall, 0,
r = router_pick_directory_server(1, fascistfirewall, need_v2_support,
retry_if_no_servers);
if (!r) {
const char *which;

8
src/or/routerlist.c
View File

@ -1294,12 +1294,14 @@ update_networkstatus_downloads(void)
* publication time. We want to download a new *one* if the most recent
* one's publication time is under ABOUT_HALF_AN_HOUR.
*/
tor_assert(trusted_dir_servers);
if (!trusted_dir_servers || !smartlist_len(trusted_dir_servers))
return;
n_dirservers = smartlist_len(trusted_dir_servers);
SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ds,
{
networkstatus_t *ns = networkstatus_get_by_digest(ds->digest);
if (!ns)
continue;
if (ns->published_on > now-ABOUT_TWO_DAYS)
++n_live;
if (!most_recent || ns->received_on > most_recent_received) {
@ -1330,7 +1332,7 @@ update_networkstatus_downloads(void)
for (i = most_recent_idx+1; needed; ++i) {
char resource[HEX_DIGEST_LEN+1];
trusted_dir_server_t *ds;
if (i > n_dirservers)
if (i >= n_dirservers)
i = 0;
ds = smartlist_get(trusted_dir_servers, i);
base16_encode(resource, sizeof(resource), ds->digest, DIGEST_LEN);