One is a probably-impossible leak if we fail to sign a consensus;
another occurs when we can't look up the user we're trying to chown
our sockets to.

Coverity is worried about this (CID 980653).  It hasn't happened in
testing, but we might as well make sure it can't happen.

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.

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.

Found by coverity; This is CID 743384.

This one occurs when changing configuration options. Found by
coverity.

This fixes a crash bug if we fail to generate an extrainfo
descriptor.

Fixes bug 8208; bugfix on 0.2.3.16-alpha.

Coverity is worried that we're checking entry_conn in some cases,
but not in the case where we set entry_conn->pending_optimistic_data.

This commit should calm it down (CID 718623).

Found by coverity

This shouldn't actually matter, since tor-resolve will return soon
after this function exits, but it's nice to be warning-free

Found by coverity, fixes CID 718633

These shouldn't really matter, but it's nice to be leak-free.

Fixes CID 980650; bugfix on 0.2.4.10-alpha.

This test was accounting for about 2/3 of our unit tests' runtime,
even on systems with a fast curve25519.  No test should take so long.

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.

To avoid surprises, good coding practice suggests parenthesizing every
macro definition -- or at the very least, all those involving an
expression.

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.

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.

Conflicts:
	src/or/connection.c

Fixes bug 7727; fix on 0.2.4.10-alpha.

This beats our old implementation, which wouldn't work when cross-compiling