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r11711@Kushana: nickm | 2006-12-24 21:42:57 -0500 

Stop counting 503s against the total number of failures allowed for a download.


svn:r9190
This commit is contained in:
Nick Mathewson 2006-12-25 02:47:37 +00:00
parent a71a5d4bf2
commit 3ab84c5f48
4 changed files with 35 additions and 22 deletions
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3
ChangeLog
View File

@ -59,6 +59,9 @@ Changes in version 0.1.2.5-xxxx - 200?-??-??
secret_onion_key in 0.0.8pre1.
- We no longer require unrecognized directory entries to be preceded by
"opt".
- When we get a 503 from a directory, and we're not a server, we don't
count the failure against the total number of failures allowed for the
thing we're trying to download.
o Security bugfixes:
- Stop sending the HttpProxyAuthenticator string to directory

7
doc/TODO
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@ -131,9 +131,10 @@ R o Take out the '5 second' timeout from the socks detach schedule.
- Critical but minor bugs, backport candidates.
- support dir 503s better
o clients don't log as loudly when they receive them
N - they don't count toward the 3-strikes rule
- should there be some threshold of 503's after which we give up?
- Delay when we get a lot of 503s?
o they don't count toward the 3-strikes rule
D But eventually, we give up after getting a lot of 503s.
N - Delay when we get a lot of 503s, rather than punting onto the
servers that have given us 503s?
o split "router is down" from "dirport shouldn't be tried for a while"?
We want a field to hold "when did we last get a 503 from this
directory server." Probably, it should go in local_routerstatus_t,

44
src/or/directory.c
View File

@ -47,10 +47,11 @@ static int purpose_is_private(uint8_t purpose);
static char *http_get_header(const char *headers, const char *which);
static void http_set_address_origin(const char *headers, connection_t *conn);
static void connection_dir_download_networkstatus_failed(
dir_connection_t *conn);
dir_connection_t *conn, int status);
static void connection_dir_download_routerdesc_failed(dir_connection_t *conn);
static void dir_networkstatus_download_failed(smartlist_t *failed);
static void dir_routerdesc_download_failed(smartlist_t *failed);
static void dir_networkstatus_download_failed(smartlist_t *failed, int status);
static void dir_routerdesc_download_failed(smartlist_t *failed,
int status_code);
static void note_request(const char *key, size_t bytes);
/********* START VARIABLES **********/
@ -284,8 +285,9 @@ directory_initiate_command_routerstatus(routerstatus_t *status,
payload, payload_len);
}
/** Called when we are unable to complete the client's request to a
* directory server: Mark the router as down and try again if possible.
/** Called when we are unable to complete the client's request to a directory
* server due to a network error: Mark the router as down and try again if
* possible.
*/
void
connection_dir_request_failed(dir_connection_t *conn)
@ -302,7 +304,7 @@ connection_dir_request_failed(dir_connection_t *conn)
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS) {
log_info(LD_DIR, "Giving up on directory server at '%s'; retrying",
conn->_base.address);
connection_dir_download_networkstatus_failed(conn);
connection_dir_download_networkstatus_failed(conn, -1);
} else if (conn->_base.purpose == DIR_PURPOSE_FETCH_SERVERDESC) {
log_info(LD_DIR, "Giving up on directory server at '%s'; retrying",
conn->_base.address);
@ -315,7 +317,8 @@ connection_dir_request_failed(dir_connection_t *conn)
* retry the fetch now, later, or never.
*/
static void
connection_dir_download_networkstatus_failed(dir_connection_t *conn)
connection_dir_download_networkstatus_failed(dir_connection_t *conn,
int status)
{
if (!conn->requested_resource) {
/* We never reached directory_send_command, which means that we never
@ -324,7 +327,9 @@ connection_dir_download_networkstatus_failed(dir_connection_t *conn)
return;
}
if (!strcmpstart(conn->requested_resource, "all")) {
/* We're a non-authoritative directory cache; try again. */
/* We're a non-authoritative directory cache; try again. Ignore status
* code, since we don't want to keep trying forever in a tight loop
* if all the authorities are shutting us out. */
smartlist_t *trusted_dirs = router_get_trusted_dir_servers();
SMARTLIST_FOREACH(trusted_dirs, trusted_dir_server_t *, ds,
++ds->n_networkstatus_failures);
@ -337,7 +342,7 @@ connection_dir_download_networkstatus_failed(dir_connection_t *conn)
dir_split_resource_into_fingerprints(conn->requested_resource+3,
failed, NULL, 0, 0);
if (smartlist_len(failed)) {
dir_networkstatus_download_failed(failed);
dir_networkstatus_download_failed(failed, status);
SMARTLIST_FOREACH(failed, char *, cp, tor_free(cp));
}
smartlist_free(failed);
@ -1050,7 +1055,7 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
status_code, escaped(reason), conn->_base.address,
conn->_base.port, conn->requested_resource);
tor_free(body); tor_free(headers); tor_free(reason);
connection_dir_download_networkstatus_failed(conn);
connection_dir_download_networkstatus_failed(conn, status_code);
return -1;
}
note_request(was_compressed?"dl/status.z":"dl/status", orig_len);
@ -1096,7 +1101,7 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
directory_info_has_arrived(time(NULL), 0);
if (which) {
if (smartlist_len(which)) {
dir_networkstatus_download_failed(which);
dir_networkstatus_download_failed(which, status_code);
}
SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
smartlist_free(which);
@ -1129,7 +1134,7 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
if (!which) {
connection_dir_download_routerdesc_failed(conn);
} else {
dir_routerdesc_download_failed(which);
dir_routerdesc_download_failed(which, status_code);
SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
smartlist_free(which);
}
@ -1152,7 +1157,7 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
n_asked_for-smartlist_len(which), n_asked_for,
conn->_base.address, (int)conn->_base.port);
if (smartlist_len(which)) {
dir_routerdesc_download_failed(which);
dir_routerdesc_download_failed(which, status_code);
}
SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
smartlist_free(which);
@ -1930,10 +1935,12 @@ connection_dir_finished_connecting(dir_connection_t *conn)
/** Called when one or more networkstatus fetches have failed (with uppercase
* fingerprints listed in <b>failed</>). Mark those fingerprints as having
* failed once. */
* failed once, unless they failed with status code 503. */
static void
dir_networkstatus_download_failed(smartlist_t *failed)
dir_networkstatus_download_failed(smartlist_t *failed, int status)
{
if (status == 503)
return;
SMARTLIST_FOREACH(failed, const char *, fp,
{
char digest[DIGEST_LEN];
@ -1949,7 +1956,7 @@ dir_networkstatus_download_failed(smartlist_t *failed)
/** Called when one or more routerdesc fetches have failed (with uppercase
* fingerprints listed in <b>failed</b>). */
static void
dir_routerdesc_download_failed(smartlist_t *failed)
dir_routerdesc_download_failed(smartlist_t *failed, int status_code)
{
char digest[DIGEST_LEN];
local_routerstatus_t *rs;
@ -1961,9 +1968,11 @@ dir_routerdesc_download_failed(smartlist_t *failed)
rs = router_get_combined_status_by_digest(digest);
if (!rs || rs->n_download_failures >= MAX_ROUTERDESC_DOWNLOAD_FAILURES)
continue;
++rs->n_download_failures;
if (status_code != 503 || server)
++rs->n_download_failures;
if (server) {
switch (rs->n_download_failures) {
case 0: rs->next_attempt_at = 0; break;
case 1: rs->next_attempt_at = 0; break;
case 2: rs->next_attempt_at = 0; break;
case 3: rs->next_attempt_at = now+60; break;
@ -1975,6 +1984,7 @@ dir_routerdesc_download_failed(smartlist_t *failed)
}
} else {
switch (rs->n_download_failures) {
case 0: rs->next_attempt_at = 0; break;
case 1: rs->next_attempt_at = 0; break;
case 2: rs->next_attempt_at = now+60; break;
case 3: rs->next_attempt_at = now+60*5; break;

3
src/or/main.c
View File

@ -2064,8 +2064,7 @@ nt_service_command_line(void)
smartlist_free(sl);
/* Allocate a string for the NT service command line */
cmdlen = strlen(tor_exe)+ strlen(" --nt-service -f ")
+ strlen(options) + 32;
cmdlen = strlen(tor_exe) + strlen(options) + 32;
command = tor_malloc(cmdlen);
/* Format the service command */