05-19-2011
In order to change a password or run sftp with an 'interactive' password requires that the process breaks off from the parent and becomes a session leader. The session has no attached tty.
This is what a daemon process and expect do.
passwd and sftp and ssh are designed to prevent security breaches. Putting a password in plaintext in a script is a security breach
Go here:
http://www.rite-group.com/rich/ssp/index.html
download the source code, find the pty.c program under the pseudo_term directory -- this is what expcect does so that people can get around the inbuilt security of passwd for example.
Last edited by jim mcnamara; 05-19-2011 at 08:59 AM..
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SETSID(2) Linux Programmer's Manual SETSID(2)
NAME
setsid - creates a session and sets the process group ID
SYNOPSIS
#include <unistd.h>
pid_t setsid(void);
DESCRIPTION
setsid() creates a new session if the calling process is not a process group leader. The calling process is the leader of the new session,
the process group leader of the new process group, and has no controlling tty. The process group ID and session ID of the calling process
are set to the PID of the calling process. The calling process will be the only process in this new process group and in this new session.
RETURN VALUE
On success, the (new) session ID of the calling process is returned. On error, (pid_t) -1 is returned, and errno is set to indicate the
error.
ERRORS
EPERM The process group ID of any process equals the PID of the calling process. Thus, in particular, setsid() fails if the calling
process is already a process group leader.
CONFORMING TO
SVr4, POSIX.1-2001.
NOTES
A child created via fork(2) inherits its parent's session ID. The session ID is preserved across an execve(2).
A process group leader is a process with process group ID equal to its PID. In order to be sure that setsid() will succeed, fork(2) and
_exit(2), and have the child do setsid().
SEE ALSO
getsid(2), setpgid(2), setpgrp(2), tcgetsid(3), credentials(7)
COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2008-12-03 SETSID(2)