commit e4614d30e58007be1d44613d039891b6f131f50f Author: Nick Mathewson nickm@torproject.org Date: Wed Nov 28 11:09:37 2012 -0500
Add a DisableV2DirectoryInfo_ option to 404 all v2 ns requests
I have no idea whether b0rken clients will DoS the network if the v2 authorities all turn this on or not. It's experimental. See #6783 for a description of how to test it more or less safely, and please be careful! --- changes/6783_big_hammer | 6 ++++++ src/or/config.c | 1 + src/or/directory.c | 13 +++++++++++++ src/or/or.h | 10 ++++++++++ 4 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/changes/6783_big_hammer b/changes/6783_big_hammer new file mode 100644 index 0000000..2ff3249 --- /dev/null +++ b/changes/6783_big_hammer @@ -0,0 +1,6 @@ + o Major features (deprecation): + - There's now a "DisableV2DirectoryInfo_" option that prevents us + from serving any directory requests for v2 directory information. + This is for us to test disabling the old deprecated V2 directory + format, so that we can see whether doing so has any effect on + network load. Part of a fix for bug 6783. diff --git a/src/or/config.c b/src/or/config.c index f888426..7e020b8 100644 --- a/src/or/config.c +++ b/src/or/config.c @@ -213,6 +213,7 @@ static config_var_t option_vars_[] = { V(DisableAllSwap, BOOL, "0"), V(DisableDebuggerAttachment, BOOL, "1"), V(DisableIOCP, BOOL, "1"), + V(DisableV2DirectoryInfo_, BOOL, "1"), V(DynamicDHGroups, BOOL, "0"), VPORT(DNSPort, LINELIST, NULL), V(DNSListenAddress, LINELIST, NULL), diff --git a/src/or/directory.c b/src/or/directory.c index 6b61fc6..38a423c 100644 --- a/src/or/directory.c +++ b/src/or/directory.c @@ -2805,6 +2805,19 @@ directory_handle_command_get(dir_connection_t *conn, const char *headers, const char *key = url + strlen("/tor/status/"); long lifetime = NETWORKSTATUS_CACHE_LIFETIME;
+ if (options->DisableV2DirectoryInfo_ && !is_v3) { + static ratelim_t reject_v2_ratelim = RATELIM_INIT(1800); + char *m; + write_http_status_line(conn, 404, "Not found"); + smartlist_free(dir_fps); + geoip_note_ns_response(GEOIP_REJECT_NOT_FOUND); + if ((m = rate_limit_log(&reject_v2_ratelim, approx_time()))) { + log_notice(LD_DIR, "Rejected a v2 networkstatus request.%s", m); + tor_free(m); + } + goto done; + } + if (!is_v3) { dirserv_get_networkstatus_v2_fingerprints(dir_fps, key); if (!strcmpstart(key, "fp/")) diff --git a/src/or/or.h b/src/or/or.h index 45eb467..0f5dbd6 100644 --- a/src/or/or.h +++ b/src/or/or.h @@ -3999,6 +3999,16 @@ typedef struct {
/** Fraction: */ double PathsNeededToBuildCircuits; + + /** Do we serve v2 directory info at all? This is a temporary option, since + * we'd like to disable v2 directory serving entirely, but we need a way to + * make it temporarily disableable, in order to do fast testing and be + * able to turn it back on if it turns out to be non-workable. + * + * XXXX024 Don't actually leave this in. + */ + int DisableV2DirectoryInfo_; + } or_options_t;
/** Persistent state for an onion router, as saved to disk. */