selfpipe already does a fine job of interfacing to signalfd.  But Debian and
Ubuntu want us to depend on the skalibs-dev package rather than build libstddjb
ourselves.  That would be fine except that skalibs-dev has static libraries
only, and they aren't built with -fPIC.  This interferes with building
mosh-{client,server} as position-independent executables, which is a desirable
security measure.

So we have our own wrapper, which invokes either signalfd or selfpipe.  And we
build it ourselves with our own flags, because it's part of the Mosh project
proper.

(closes #108)

configure's linker flag check also compiles a C++ program.  g++ -pie informs
both the compiler and linker, but clang++ -Wl,-pie is only a linker flag, and
the linker will complain that the code hasn't been compiled as
position-independent.

clang on OS X wants the former.

c.f. http://bugs.ruby-lang.org/issues/5697

clang was spewing warnings about the unrecognized -fno-default-inline.  (Oddly,
it warns only with -c, not when compiling directly to an executable.)  For
completeness we also check -pipe, even though clang is OK with that one.

It should be fine to omit either flag.  gcc -fno-default-inline drops the
implicit 'inline' annotation on functions defined inside a class scope, but
'inline' is only a hint anyway.  -fno-default-inline does not change linkage.
-pipe is merely a compile speed optimization.

There is no way to make clang's "argument unused" warning fatal.

Ideally the search string would also include 'clang: ' but this output might
depend on clang's argv[0].

Closes #79.

IMO 'new' should be dropped entirely since it's not optional and 'new' is the only choice.

If it were to change in future then it should go after all the options.

(closes #111)

The m4_ifnblank patch was accepted upstream as
http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=commitdiff;h=7ea1d1b18e5c1c3300936dd89c3e55b5b370ae72



Signed-off-by: Anders Kaseorg <andersk@mit.edu>

(closes #153)

Ubuntu 10.04 does not recognise `sudo add-apt-repository ppa:blah` out of the box.

Closes #106 github issue.
Closes #133 github issue.
Closes #131 github issue.

Closes #104 github pull request.

Recent ncurses can be configured --with-termlib, which splits out the
terminfo-level functions from libncurses into a separate libtinfo.
This allows us to avoid an unnecessary dependency on libncurses.  (We
already avoided this on distributions that link with -Wl,--as-needed.)

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

Closes #128 github pull request.

performed and FreeBSD (at least) implements thin behaviour.  Add an
explicit test to detect this situation in Dispatcher::parse_params().
(This behaviour difference is not relevant to other uses of strtol()).

This corrects the mishandling of (eg) "CSI m" on FreeBSD.

Closes #129 github pull request.
[keithw -- also fixes same issue with mosh-server on OS X]

AC_MSG_ERROR inside the variable assignment doesn't work properly.  We get
output like

    checking for protoc... ./configure: line 4524: is: command not found
    no

and then the build continues (and fails) with PROTOC="".

Closes #132 github pull request.

Identified by Anders Kaseorg.

Test case:

( reset; seq 100; printf 'Hello, world!'; sleep 1;
printf '\t\t\t\t\t\t\t\t\t\t   \r\e[K'; sleep 1; printf '\n' )
> /dev/pts/16 2>&1

(replace /dev/pts/16 with mosh or termemu terminal)

This tests cryptographic primitives implemented by others.  It uses the same
interfaces and indeed the same compiled object code as the Mosh client and
server.  It does not particularly test any code written for the Mosh project.

Instead of guessing the right function to use, we malloc() 15 bytes more than
we need, and compute the aligned offset within.  The AlignedBuffer class takes
care of passing the original pointer to free().

This simplifies the core crypto routines, especially the error handling.  In
fact there was already one error path where we were failing to call free().

(closes #93)

The header is not available everywhere, so only include it if it
is present.  (The extra include should be harmless on Linux by
inspection.)

On FreeBSD, the header which defines htobe64() is the sys/ variant,
unlike Linux.

This reverts commit 78c7c72b.