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Merge branch 'bug1074_launch_conn_on_skew'

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Fixed conflict on rename of router_get_by_digest->router_get_by_id_digest

Conflicts:
	src/or/command.c
This commit is contained in:
Nick Mathewson 2011-02-25 12:12:44 -05:00
commit a47fdaf9a0
2 changed files with 40 additions and 9 deletions
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7
changes/launch_authcon_on_skew Normal file
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@ -0,0 +1,7 @@
o Minor features
- When we get a connection from a non-authority that tells us our
clock is skewed, and we haven't heard about clock skew (or lack
thereof) from an authority, launch a connection to an authority
so we can find out whether we're really skewed. Related to
bug 1074. Patch from "AltF4".

42
src/or/command.c
View File

@ -45,6 +45,13 @@ uint64_t stats_n_destroy_cells_processed = 0;
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.
* 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 */
static void command_process_create_cell(cell_t *cell, or_connection_t *conn);
@ -621,17 +628,16 @@ command_process_netinfo_cell(cell_t *cell, or_connection_t *conn)
}
/* Act on apparent skew. */
/** Warn when we get a netinfo skew with at least this value. */
/** Warn when we get a netinfo skew with at least this value.
Ignore if we've already received skew info from a trusted dir */
#define NETINFO_NOTICE_SKEW 3600
if (labs(apparent_skew) > NETINFO_NOTICE_SKEW &&
router_get_by_id_digest(conn->identity_digest)) {
router_get_by_id_digest(conn->identity_digest) &&
received_netinfo_from_trusted_dir != 2) {
char dbuf[64];
int severity;
/*XXXX be smarter about when everybody says we are skewed. */
if (router_digest_is_trusted_dir(conn->identity_digest))
severity = LOG_WARN;
else
severity = LOG_INFO;
int severity = router_digest_is_trusted_dir(conn->identity_digest) ?
LOG_WARN : LOG_INFO;
format_time_interval(dbuf, sizeof(dbuf), apparent_skew);
log_fn(severity, LD_GENERAL, "Received NETINFO cell with skewed time from "
"server at %s:%d. It seems that our clock is %s by %s, or "
@ -640,12 +646,30 @@ command_process_netinfo_cell(cell_t *cell, or_connection_t *conn)
conn->_base.address, (int)conn->_base.port,
apparent_skew>0 ? "ahead" : "behind", dbuf,
apparent_skew>0 ? "behind" : "ahead");
if (severity == LOG_WARN) /* only tell the controller if an authority */
if (severity == LOG_WARN) { /* only tell the controller if an authority */
control_event_general_status(LOG_WARN,
"CLOCK_SKEW SKEW=%ld SOURCE=OR:%s:%d",
apparent_skew,
conn->_base.address, conn->_base.port);
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;
tor_addr_from_ipv4h(&trusted_dir_addr, any_trusted_dir->addr);
connection_or_connect(&trusted_dir_addr,
any_trusted_dir->or_port,
any_trusted_dir->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. */