Coverity rightly complains that early in the function we're checking
whether username is NULL, and later we're passing it unconditionally
to strlen().

Fixes CID 1437967.  Bug not in any released Tor.

This fixes a memory leak found by fuzzing.

The "Bifroest" bridge authority has been retired; the new bridge authority
is "Serge", and it is operated by George from the TorBSD project.

Closes ticket 26771.

rl1987 authored May 23, 2018 and Nick Mathewson committed Jul 12, 2018

We pullup 512 bytes of input to make sure that at least one SOCKS
message ends up in head of linked list

rl1987 authored May 15, 2018 and Nick Mathewson committed Jul 12, 2018

squash! Reimplement phase 1 of SOCKS5 using trunnel

(When the ticket isn't a bugfix, we don't say "fixes bug XYZ".  When
we do, then the version in "bugfix on XXX" is supposed to be the
first version that had the bug.)