until just before we exec the command. This is consistent with the
non-pty path. As a side effect, the monitor process runs as root
and not the runas user.
regardless of whether or not it is ignored by the underlying command
since there's no way to know what signal handlers the command will
install. Now we just use sudo_sigaction() to set a flag in
saved_signals[] to indicate whether a signal needs to be restored
before exec.
wrapper that has an extra flag to check the saved_signals list to
only install the handler if the signal is not already ignored.
Bump plugin API version for the new front-end signal behavior.
option to match. When set, commands are started in the background
and automatically foregrounded as needed. There are issues with
some ill-mannered programs (like Linux su) so this is not the
default.
foreground process. This helps work around poorly behaved programs
that catch SIGTTOU/SIGTTIN but suspend themselves with SIGSTOP. At
worst, sudo will go into the background but upon resume the command
will be runnable. Otherwise, we can get into a situation where the
command will immediately suspend itself.
MAXHOSTNAMELEN and the MIN/MAX macros. We now use PATH_MAX and
HOST_NAME_MAX throughout without falling back on MAXPATHLEN or
MAXHOSTNAMELEN and define our own MIN/MAX macros as needed.
it back to the command. This fixes a problem with BSD-derived
versions of the reboot command which send SIGTERM to all other
processes, including the sudo process. Sudo would then deliver
SIGTERM to reboot which would die before calling the reboot() system
call, effectively leaving the system in single user mode.
shortage. Older Solaris select() may return EIO instead of EBADF
when the tty goes away. If we get an unhandled select() failure,
kill the child and exit cleanly.
It is better to receive EIO from read()/write() than to be suspended
when we don't expect it. Fixes a problem when our terminal is
revoked which can happen when, e.g. our sshd is killed unceremoniously.
Also, only change the value of "alive" from true to false, never
from false to true. It is possible for us to receive notification
of the child having stopped after it is already dead. This does
not mean it has risen from the grave.
use by sesh.c. This fixes NOEXEC when SELinux is used. Instead
of disabling exec in exec_setup(), disable it immediately before
executing the command. Adapted from a diff by Arno Schuring.
the command. Fixes a problem when the entire login session is
killed when ssh is disconnected or the terminal window is closed.
Previously, the monitor would exit and plugin's close method would
not be called.
instead of exit() to avoid flushing buffers twice.
Improved background mode support. When not allocating a pty, the
command is run in its own process group. This prevents write access
to the tty. When running in a pty, stdin is not hooked up and we
never read from /dev/tty, which results in similar behavior.
