commit 24096d0cec3084b2cbc1c35cbb26a5d92dd4add2 Author: AltF4 altf4@phx2600.org Date: Tue Feb 15 22:36:41 2011 -0700

Fix for #1074 "Part 3"

Changed received_netinfo_from_trusted_dir into a tristate in order to keep track of whether we have already tried contacting a trusted dir. So we don't send multiple requests if we get a bunch of skews. --- src/or/command.c | 23 ++++++++++++++++------- 1 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/src/or/command.c b/src/or/command.c index c873516..44420c9 100644 --- a/src/or/command.c +++ b/src/or/command.c @@ -45,7 +45,11 @@ uint64_t stats_n_versions_cells_processed = 0; /** How many CELL_NETINFO cells have we received, ever? */ uint64_t stats_n_netinfo_cells_processed = 0; /** Have we received a NETINFO cell from a trusted dir, ever? Used - * to decide what to do about time skew. */ + * to decide what to do about time skew. + * 0 == No, and and we haven't tried asking an authority yet + * 1 == No, we've launched a query but haven't heard back yet + * 2 == Yes + **/ static int received_netinfo_from_trusted_dir = 0;

/* These are the main functions for processing cells */ @@ -625,9 +629,9 @@ command_process_netinfo_cell(cell_t *cell, or_connection_t *conn) #define NETINFO_NOTICE_SKEW 3600 if (labs(apparent_skew) > NETINFO_NOTICE_SKEW && router_get_by_digest(conn->identity_digest) && - !received_netinfo_from_trusted_dir) { + received_netinfo_from_trusted_dir != 2) { char dbuf[64]; - /*XXXX be smarter about when everybody says we are skewed. */ + int severity = router_digest_is_trusted_dir(conn->identity_digest) ? LOG_WARN : LOG_INFO; format_time_interval(dbuf, sizeof(dbuf), apparent_skew); @@ -643,7 +647,10 @@ command_process_netinfo_cell(cell_t *cell, or_connection_t *conn) "CLOCK_SKEW SKEW=%ld SOURCE=OR:%s:%d", apparent_skew, conn->_base.address, conn->_base.port); - } else { /* Connect to a trusted dir to trigger a NETINFO cell*/ + received_netinfo_from_trusted_dir = 2; + /* Connect to a trusted dir to trigger a NETINFO cell + * only if we haven't already */ + } else if(received_netinfo_from_trusted_dir == 0) { routerstatus_t *any_trusted_dir = router_pick_trusteddirserver(NO_AUTHORITY, 0); tor_addr_t trusted_dir_addr; @@ -651,12 +658,14 @@ command_process_netinfo_cell(cell_t *cell, or_connection_t *conn) connection_or_connect(&trusted_dir_addr, any_trusted_dir->or_port, any_trusted_dir->descriptor_digest); + received_netinfo_from_trusted_dir = 1; } }

- /* Note that we received a netinfo cell from a trusted directory */ - if (router_digest_is_trusted_dir(conn->identity_digest)) - received_netinfo_from_trusted_dir = 1; + /* Note that we received a good netinfo cell from a trusted directory */ + if (router_digest_is_trusted_dir(conn->identity_digest) && + labs(apparent_skew) <= NETINFO_NOTICE_SKEW) + received_netinfo_from_trusted_dir = 2;

/* XXX maybe act on my_apparent_addr, if the source is sufficiently * trustworthy. */