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Part of #40560
Signed-off-by: David Goulet <dgoulet@torproject.org>
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Signed-off-by: David Goulet <dgoulet@torproject.org>
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Tor has configure libevent to attempt up to 3 times a DNS query for a
maximum of 5 seconds each. Once that 5 seconds has elapsed, it consider
the query "Timed Out" but tor only gets a timeout if all 3 attempts have
failed.
For example, using Unbound, it has a much higher threshold of timeout.
It is well defined in
https://www.nlnetlabs.nl/documentation/unbound/info-timeout/ and has
some complexity to it. But the gist is that if it times out, it will be
much more than 5 seconds.
And so the Tor DNS timeouts are more of a "UX issue" rather than a
"network issue". For this reason, we are removing this metric from the
overload general signal.
See https://gitlab.torproject.org/tpo/network-health/team/-/issues/139
for more information.
Fixes #40527
Signed-off-by: David Goulet <dgoulet@torproject.org>
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With this commit, we will only report a general overload state if we've
seen more than X% of DNS timeout errors over Y seconds. Previous
behavior was to report when a single timeout occured which is really too
small of a threshold.
The value X is a consensus parameters called
"overload_dns_timeout_scale_percent" which is a scaled percentage
(factor of 1000) so we can represent decimal points for X like 0.5% for
instance. Its default is 1000 which ends up being 1%.
The value Y is a consensus parameters called
"overload_dns_timeout_period_secs" which is the time period for which
will gather DNS errors and once over, we assess if that X% has been
reached ultimately triggering a general overload signal.
Closes #40491
Signed-off-by: David Goulet <dgoulet@torproject.org>
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Signed-off-by: David Goulet <dgoulet@torproject.org>
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Fixes #40364
Signed-off-by: David Goulet <dgoulet@torproject.org>
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We use it in router.c, where chunks are joined with "", not with
NL... so leaving off the terminating NL will lead to an unparseable
extrainfo.
Found by toralf. Bug not in any released Tor.
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- Implement overload statistics structure.
- Implement function that keeps track of overload statistics.
- Implement function that writes overload statistics to descriptor.
- Unittest for the whole logic.
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Signed-off-by: David Goulet <dgoulet@torproject.org>
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The previous parser only considered stats files _starting_ with the
timestamp tag, not stats files having the timestamp tag in a later
position. While this applies to all current stats files, a future
stats file might look differently. Better to fix the function now than
be surprised in another 9 years from now.
This commit also adds a test case for such future stats, and it fixes
stats file paths in newly added unit tests.
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It turns out that 9 years ago, we stopped appending data into stats file and
rather overwrite everytime we have new stats (see commit
a6a127c833eace1100aca7ab8ad118862bb8a8b9)
The load_stats_file() function was still thinking that we could have the same
line many times in the file which turns out to be false since 9 years ago.
However, that did not cause problem until IPv6 connection stats came along
which introduced a new line in conn-stats: "ipv6-conn-bi-direct ...".
Before, that file contained a single line starting with the tag
"conn-bi-direct". That very tag appears also in the IPv6 tag (see above) so
the load_stats_file() function would consider that the IPv6 line as the last
tag to be appeneded to the file and fail to report the line above (for IPv4).
It would actually truncate the IPv6 line and report it (removing the "ipv6-"
part).
In other words, "conn-bi-direct" was not reported and instead
"ipv6-conn-bi-direct" was used without the "ipv6-" part.
This commit refactors the entire function so that now it looks for a
"timestamp tag" to validate and then if everything is fine, returns the entire
content of the file. The refactor simplifies the function, adds logging in
case of failures and modernize it in terms of coding standard.
Unit tests are also added that makes sure the loaded content matches the
entire file if timestamp validation passes.
Fixes #40226
Signed-off-by: David Goulet <dgoulet@torproject.org>
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Currently Tor fails with the following error:
src/test/test_stats.c: In function ‘test_rephist_v3_onions’:
src/test/test_stats.c:527:22: error: overflow in implicit constant conversion [-Werror=overflow]
update_approx_time(10101010101);
This patch changes the constant passed to update_approx_time() to avoid
the overflow in the implicit conversion.
See: tor#40199
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Spotted by coverity. This is CID 1465571.
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Signed-off-by: Suraj Upadhyay <usuraj35@gmail.com>
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Added tests for
1. commit_max
2. advance_obs
3. add_obs
4. rep_hist_fill_bandwidth_history
5. rep_hist_get_bandwidth_lines
(Lightly edited by nickm to use new names from bwhist refactoring.)
Signed-off-by: Suraj Upadhyay <usuraj35@gmail.com>
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Added tests for
1. commit_max
2. advance_obs
3. add_obs
4. rep_hist_fill_bandwidth_history
5. rep_hist_get_bandwidth_lines
Signed-off-by: Suraj Upadhyay <usuraj35@gmail.com>
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This is an automated commit, generated by this command:
./scripts/maint/rename_c_identifier.py \
rep_hist_conn_stats_init conn_stats_init \
rep_hist_note_or_conn_bytes conn_stats_note_or_conn_bytes \
rep_hist_reset_conn_stats conn_stats_reset \
rep_hist_format_conn_stats conn_stats_format \
rep_hist_conn_stats_write conn_stats_save \
rep_hist_conn_stats_term conn_stats_terminate \
bidi_map_free_all conn_stats_free_all
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Part of 32213.
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Part of 32213.
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