Roger Dingledine [Tue, 12 Feb 2013 02:57:32 +0000 (21:57 -0500)]
Check for IP address change every minute, not 15 minutes
Relays used to check every 10 to 60 seconds, as an accidental side effect
of calling directory_fetches_from_authorities() when considering doing
a directory fetch. The fix for bug 1992 removes that side effect. At the
same time, bridge relays never had the side effect, leading to confused
bridge operators who tried crazy tricks to get their bridges to notice
IP address changes (see ticket 1913).
The new behavior is to reinstate an every-60-seconds check for both
public relays and bridge relays, now that the side effect is gone.
Nick Mathewson [Mon, 11 Feb 2013 21:40:48 +0000 (16:40 -0500)]
Fix a nigh-impossible overflow in cpuworker.c
When we compute the estimated microseconds we need to handle our
pending onionskins, we could (in principle) overflow a uint32_t if
we ever had 4 million pending onionskins before we had any data
about how onionskins take. Nevertheless, let's compute it properly.
Fixes bug 8210; bugfix on 0.2.4.10. Found by coverity; this is CID
980651.
Nick Mathewson [Mon, 11 Feb 2013 21:32:13 +0000 (16:32 -0500)]
Fix a null-deref-on-fail in unit tests
If geoip_format_bridge_stats() returned NULL when it should have
returned a string, we would have tried to deref NULL, and died. Not
a big deal in the unit tests, but still worth fixing.
Roger Dingledine [Sun, 10 Feb 2013 21:45:48 +0000 (16:45 -0500)]
Refactor resolve_my_address() so logs are more accurate / helpful
It returns the method by which we decided our public IP address
(explicitly configured, resolved from explicit hostname, guessed from
interfaces, learned by gethostname).
Now we can provide more helpful log messages when a relay guesses its IP
address incorrectly (e.g. due to unexpected lines in /etc/hosts). Resolves
ticket 2267.
While we're at it, stop sending a stray "(null)" in some cases for the
server status "EXTERNAL_ADDRESS" controller event. Resolves bug 8200.
Nick Mathewson [Thu, 27 Dec 2012 21:38:33 +0000 (16:38 -0500)]
Add explicit check for !first_conn in ...resume_edge_reading_helper
This check isn't necessary (see comment on #7801), but it took at
least two smart people a little while to see why it wasn't necessary,
so let's have it in to make the code more readable.
Nick Mathewson [Fri, 8 Feb 2013 21:28:05 +0000 (16:28 -0500)]
Fix numerous problems with Tor's weak RNG.
We need a weak RNG in a couple of places where the strong RNG is
both needless and too slow. We had been using the weak RNG from our
platform's libc implementation, but that was problematic (because
many platforms have exceptionally horrible weak RNGs -- like, ones
that only return values between 0 and SHORT_MAX) and because we were
using it in a way that was wrong for LCG-based weak RNGs. (We were
counting on the low bits of the LCG output to be as random as the
high ones, which isn't true.)
This patch adds a separate type for a weak RNG, adds an LCG
implementation for it, and uses that exclusively where we had been
using the platform weak RNG.
Nick Mathewson [Mon, 4 Feb 2013 17:50:01 +0000 (12:50 -0500)]
Tolerate curve25519 backends where the high bit of the pk isn't ignored
Right now, all our curve25519 backends ignore the high bit of the
public key. But possibly, others could treat the high bit of the
public key as encoding out-of-bounds values, or as something to be
preserved. This could be used to distinguish clients with different
backends, at the cost of killing a circuit.
As a workaround, let's just clear the high bit of each public key
indiscriminately before we use it. Fix for bug 8121, reported by
rransom. Bugfix on 0.2.4.8-alpha.
Nick Mathewson [Mon, 4 Feb 2013 16:32:55 +0000 (11:32 -0500)]
Fix compilation with --disable-curve25519 option
The fix is to move the two functions to format/parse base64
curve25519 public keys into a new "crypto_format.c" file. I could
have put them in crypto.c, but that's a big file worth splitting
anyway.
Fixes bug 8153; bugfix on 0.2.4.8-alpha where I did the fix for 7869.
Nick Mathewson [Tue, 11 Dec 2012 22:46:12 +0000 (17:46 -0500)]
Fix serious breakage in connection_handle_write_impl
When we first implemented TLS, we assumed in conneciton_handle_write
that a TOR_TLS_WANT_WRITE from flush_buf_tls meant that nothing had
been written. But when we moved our buffers to a ring buffer
implementation back in 0.1.0.5-rc (!), we broke that invariant: it's
possible that some bytes have been written but nothing.
That's bad. It means that if we do a sequence of TLS writes that ends
with a WANTWRITE, we don't notice that we flushed any bytes, and we
don't (I think) decrement buckets.
Mike Perry [Wed, 30 Jan 2013 22:40:46 +0000 (18:40 -0400)]
Refactor the scaling parameter fetching into a single function.
Also, deprecate the torrc options for the scaling values. It's unlikely anyone
but developers will ever tweak them, even if we provided a single ratio value.