Unverified Commit 4665ac9e authored by teor's avatar teor
Browse files

Merge remote-tracking branch 'tor-github/pr/1210' into combined31343_31374_035

parents e83eabc9 a4400a77
o Minor bugfixes (compilation):
- Avoid using labs() on time_t, which can cause compilation warnings
on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
o Minor bugfixes (clock skew detection):
- Don't believe clock skew results from NETINFO cells that appear to
arrive before the VERSIONS cells they are responding to were sent.
Previously, we would accept them up to 3 minutes "in the past".
Fixes bug 31343; bugfix on 0.2.4.4-alpha.
......@@ -1637,7 +1637,19 @@ channel_tls_process_padding_negotiate_cell(cell_t *cell, channel_tls_t *chan)
}
/**
* Process a 'netinfo' cell.
* Helper: compute the absolute value of a time_t.
*
* (we need this because labs() doesn't always work for time_t, since
* long can be shorter than time_t.)
*/
static inline time_t
time_abs(time_t val)
{
return (val < 0) ? -val : val;
}
/**
* Process a 'netinfo' cell
*
* This function is called to handle an incoming NETINFO cell; read and act
* on its contents, and set the connection state to "open".
......@@ -1654,7 +1666,7 @@ channel_tls_process_netinfo_cell(cell_t *cell, channel_tls_t *chan)
time_t now = time(NULL);
const routerinfo_t *me = router_get_my_routerinfo();
long apparent_skew = 0;
time_t apparent_skew = 0;
tor_addr_t my_apparent_addr = TOR_ADDR_NULL;
int started_here = 0;
const char *identity_digest = NULL;
......@@ -1721,7 +1733,11 @@ channel_tls_process_netinfo_cell(cell_t *cell, channel_tls_t *chan)
/* Decode the cell. */
timestamp = ntohl(get_uint32(cell->payload));
if (labs(now - chan->conn->handshake_state->sent_versions_at) < 180) {
const time_t sent_versions_at =
chan->conn->handshake_state->sent_versions_at;
if (now > sent_versions_at && (now - sent_versions_at) < 180) {
/* If we have gotten the NETINFO cell reasonably soon after having
* sent our VERSIONS cell, maybe we can learn skew information from it. */
apparent_skew = now - timestamp;
}
......@@ -1801,7 +1817,7 @@ channel_tls_process_netinfo_cell(cell_t *cell, channel_tls_t *chan)
/* Act on apparent skew. */
/** Warn when we get a netinfo skew with at least this value. */
#define NETINFO_NOTICE_SKEW 3600
if (labs(apparent_skew) > NETINFO_NOTICE_SKEW &&
if (time_abs(apparent_skew) > NETINFO_NOTICE_SKEW &&
(started_here ||
connection_or_digest_is_known_relay(chan->conn->identity_digest))) {
int trusted = router_digest_is_trusted_dir(chan->conn->identity_digest);
......
......@@ -2856,7 +2856,7 @@ int
router_differences_are_cosmetic(const routerinfo_t *r1, const routerinfo_t *r2)
{
time_t r1pub, r2pub;
long time_difference;
time_t time_difference;
tor_assert(r1 && r2);
/* r1 should be the one that was published first. */
......@@ -2920,7 +2920,9 @@ router_differences_are_cosmetic(const routerinfo_t *r1, const routerinfo_t *r2)
* give or take some slop? */
r1pub = r1->cache_info.published_on;
r2pub = r2->cache_info.published_on;
time_difference = labs(r2->uptime - (r1->uptime + (r2pub - r1pub)));
time_difference = r2->uptime - (r1->uptime + (r2pub - r1pub));
if (time_difference < 0)
time_difference = - time_difference;
if (time_difference > ROUTER_ALLOW_UPTIME_DRIFT &&
time_difference > r1->uptime * .05 &&
time_difference > r2->uptime * .05)
......
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