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Open /dev/ptm before pledge() and save it to be used for PTMGET later

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(this means inlining forkpty()).

ok deraadt
This commit is contained in:
nicm
2017-01-23 10:09:43 +00:00
parent 4ede35c48c
commit 98e7fbb2ac
6 changed files with 79 additions and 1 deletions
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67
pty.c Normal file
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/* $OpenBSD$ */
/*
* Copyright (c) 2017 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/tty.h>
#include <fcntl.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <util.h>
int pty_open(int *);
pid_t pty_fork(int, int *, char *, size_t, struct winsize *);
int
pty_open(int *fd)
{
*fd = open(PATH_PTMDEV, O_RDWR|O_CLOEXEC);
if (*fd < 0)
return (-1);
return (0);
}
pid_t
pty_fork(int ptmfd, int *fd, char *name, size_t namelen, struct winsize *ws)
{
struct ptmget ptm;
pid_t pid;
if ((ioctl(ptmfd, PTMGET, &ptm) == -1))
return (-1);
strlcpy(name, ptm.sn, namelen);
ioctl(ptm.sfd, TIOCSWINSZ, ws);
switch (pid = fork()) {
case -1:
close(ptm.cfd);
close(ptm.sfd);
return (-1);
case 0:
close(ptm.cfd);
login_tty(ptm.sfd);
return (0);
}
*fd = ptm.cfd;
close(ptm.sfd);
return (pid);
}