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1.8 |
// This file is part of libptytty. Do not make local modifications. |
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// http://software.schmorp.de/pkg/libptytty |
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/*----------------------------------------------------------------------* |
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1.1 |
* File: ptytty.C |
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*----------------------------------------------------------------------* |
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* |
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* All portions of code are copyright by their respective author/s. |
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* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
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1.2 |
* Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
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1.12 |
* Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> |
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1.1 |
* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*---------------------------------------------------------------------*/ |
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1.8 |
#include "../config.h" |
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1.1 |
|
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1.3 |
#include "ptytty.h" |
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1.2 |
#include <cstdlib> |
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#include <cstring> |
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1.19 |
#include <csignal> |
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1.2 |
|
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#include <sys/types.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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1.1 |
#ifdef HAVE_SYS_IOCTL_H |
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# include <sys/ioctl.h> |
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#endif |
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1.2 |
#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
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1.1 |
# include <sys/stropts.h> /* for I_PUSH */ |
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#endif |
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#ifdef HAVE_ISASTREAM |
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# include <stropts.h> |
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#endif |
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1.2 |
#if defined(HAVE_PTY_H) |
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1.1 |
# include <pty.h> |
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1.2 |
#elif defined(HAVE_LIBUTIL_H) |
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1.1 |
# include <libutil.h> |
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1.2 |
#elif defined(HAVE_UTIL_H) |
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1.1 |
# include <util.h> |
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#endif |
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1.2 |
#ifdef TTY_GID_SUPPORT |
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#include <grp.h> |
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#endif |
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1.1 |
|
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#include <cstdio> |
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1.2 |
|
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///////////////////////////////////////////////////////////////////////////// |
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1.1 |
|
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/* ------------------------------------------------------------------------- * |
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* GET PSEUDO TELETYPE - MASTER AND SLAVE * |
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* ------------------------------------------------------------------------- */ |
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/* |
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ayin |
1.26 |
* Returns pty file descriptor, or -1 on failure |
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1.1 |
* If successful, ttydev is set to the name of the slave device. |
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* fd_tty _may_ also be set to an open fd to the slave device |
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*/ |
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1.2 |
#if defined(UNIX98_PTY) |
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1.25 |
|
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static int |
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get_pty (int *fd_tty, char **ttydev) |
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{ |
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int pfd; |
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1.1 |
|
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1.2 |
# if defined(HAVE_GETPT) |
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1.25 |
pfd = getpt(); |
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1.2 |
# elif defined(HAVE_POSIX_OPENPT) |
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1.25 |
pfd = posix_openpt (O_RDWR); |
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1.2 |
# else |
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1.25 |
pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); |
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1.2 |
# endif |
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1.1 |
|
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1.25 |
if (pfd >= 0) |
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{ |
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if (grantpt (pfd) == 0 /* change slave permissions */ |
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&& unlockpt (pfd) == 0) |
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{ /* slave now unlocked */ |
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*ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
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return pfd; |
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} |
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close (pfd); |
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} |
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return -1; |
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} |
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1.2 |
|
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#elif defined(HAVE_OPENPTY) |
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1.1 |
|
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1.25 |
static int |
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get_pty (int *fd_tty, char **ttydev) |
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{ |
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int pfd; |
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int res; |
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ayin |
1.26 |
|
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ayin |
1.29 |
res = openpty (&pfd, fd_tty, NULL, NULL, NULL); |
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root |
1.25 |
|
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if (res != -1) |
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{ |
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ayin |
1.29 |
*ttydev = strdup (ttyname (*fd_tty)); |
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1.25 |
return pfd; |
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} |
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return -1; |
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} |
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1.2 |
#elif defined(HAVE__GETPTY) |
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1.25 |
static int |
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get_pty (int *fd_tty, char **ttydev) |
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{ |
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int pfd; |
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*ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
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if (*ttydev != NULL) |
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return pfd; |
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return -1; |
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} |
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1.1 |
|
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1.2 |
#elif defined(HAVE_DEV_PTC) |
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1.1 |
|
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1.25 |
static int |
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get_pty (int *fd_tty, char **ttydev) |
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{ |
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int pfd; |
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if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
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{ |
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*ttydev = strdup (ttyname (pfd)); |
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return pfd; |
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} |
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return -1; |
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} |
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1.1 |
|
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root |
1.2 |
#elif defined(HAVE_DEV_CLONE) |
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1.25 |
static int |
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get_pty (int *fd_tty, char **ttydev) |
156 |
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{ |
157 |
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int pfd; |
158 |
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if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
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{ |
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*ttydev = strdup (ptsname (pfd)); |
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return pfd; |
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} |
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return -1; |
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} |
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1.1 |
|
168 |
root |
1.2 |
#else |
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root |
1.1 |
|
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root |
1.25 |
/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
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static int |
172 |
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get_pty (int *fd_tty, char **ttydev) |
173 |
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{ |
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int pfd; |
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int i; |
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char pty_name[32]; |
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char tty_name[32]; |
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const char *majors = "pqrstuvwxyzabcde"; |
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const char *minors = "0123456789abcdef"; |
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for (i = 0; i < 256; i++) |
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{ |
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snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
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snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
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if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
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{ |
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snprintf(pty_name, 32, "/dev/ptyp%d", i); |
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snprintf(tty_name, 32, "/dev/ttyp%d", i); |
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if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
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continue; |
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} |
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if (access (tty_name, R_OK | W_OK) == 0) |
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{ |
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*ttydev = strdup (tty_name); |
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return pfd; |
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} |
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200 |
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close (pfd); |
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} |
202 |
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return -1; |
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} |
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ayin |
1.24 |
|
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root |
1.1 |
#endif |
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/*----------------------------------------------------------------------*/ |
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/* |
210 |
ayin |
1.26 |
* Returns tty file descriptor, or -1 on failure |
211 |
root |
1.1 |
*/ |
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static int |
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get_tty (char *ttydev) |
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{ |
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return open (ttydev, O_RDWR | O_NOCTTY, 0); |
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} |
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/*----------------------------------------------------------------------*/ |
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/* |
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* Make our tty a controlling tty so that /dev/tty points to us |
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*/ |
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static int |
223 |
root |
1.2 |
control_tty (int fd_tty) |
224 |
root |
1.1 |
{ |
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ayin |
1.28 |
int fd; |
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root |
1.1 |
setsid (); |
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229 |
root |
1.2 |
#if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
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root |
1.1 |
/* |
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* Push STREAMS modules: |
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* ptem: pseudo-terminal hardware emulation module. |
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* ldterm: standard terminal line discipline. |
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* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
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* |
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* After we push the STREAMS modules, the first open () on the slave side |
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* (i.e. the next section between the dashes giving us "tty opened OK") |
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* should make the "ptem" (or "ldterm" depending upon either which OS |
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* version or which set of manual pages you have) module give us a |
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* controlling terminal. We must already have close ()d the master side |
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* fd in this child process before we push STREAMS modules on because the |
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* documentation is really unclear about whether it is any close () on |
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* the master side or the last close () - i.e. a proper STREAMS dismantling |
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* close () - on the master side which causes a hang up to be sent |
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* through - Geoff Wing |
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*/ |
247 |
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# ifdef HAVE_ISASTREAM |
248 |
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if (isastream (fd_tty) == 1) |
249 |
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# endif |
250 |
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{ |
251 |
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ioctl (fd_tty, I_PUSH, "ptem"); |
252 |
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ioctl (fd_tty, I_PUSH, "ldterm"); |
253 |
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ioctl (fd_tty, I_PUSH, "ttcompat"); |
254 |
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} |
255 |
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#endif |
256 |
root |
1.2 |
|
257 |
ayin |
1.27 |
#ifdef TIOCSCTTY |
258 |
root |
1.2 |
ioctl (fd_tty, TIOCSCTTY, NULL); |
259 |
ayin |
1.27 |
#else |
260 |
ayin |
1.28 |
fd = open (ttyname (fd_tty), O_RDWR); |
261 |
ayin |
1.27 |
if (fd >= 0) |
262 |
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close (fd); |
263 |
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#endif |
264 |
root |
1.2 |
|
265 |
ayin |
1.28 |
fd = open ("/dev/tty", O_WRONLY); |
266 |
root |
1.1 |
if (fd < 0) |
267 |
root |
1.10 |
return -1; /* fatal */ |
268 |
root |
1.2 |
|
269 |
root |
1.1 |
close (fd); |
270 |
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271 |
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return 0; |
272 |
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} |
273 |
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274 |
root |
1.2 |
void |
275 |
root |
1.4 |
ptytty::close_tty () |
276 |
root |
1.2 |
{ |
277 |
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if (tty < 0) |
278 |
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return; |
279 |
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280 |
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close (tty); |
281 |
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tty = -1; |
282 |
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} |
283 |
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284 |
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bool |
285 |
root |
1.4 |
ptytty::make_controlling_tty () |
286 |
root |
1.2 |
{ |
287 |
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return control_tty (tty) >= 0; |
288 |
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} |
289 |
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|
290 |
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void |
291 |
root |
1.4 |
ptytty::set_utf8_mode (bool on) |
292 |
root |
1.2 |
{ |
293 |
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#ifdef IUTF8 |
294 |
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if (pty < 0) |
295 |
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return; |
296 |
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|
297 |
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struct termios tio; |
298 |
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299 |
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if (tcgetattr (pty, &tio) != -1) |
300 |
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{ |
301 |
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tcflag_t new_cflag = tio.c_iflag; |
302 |
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303 |
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if (on) |
304 |
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new_cflag |= IUTF8; |
305 |
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else |
306 |
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new_cflag &= ~IUTF8; |
307 |
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|
308 |
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if (new_cflag != tio.c_iflag) |
309 |
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{ |
310 |
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tio.c_iflag = new_cflag; |
311 |
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tcsetattr (pty, TCSANOW, &tio); |
312 |
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} |
313 |
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} |
314 |
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#endif |
315 |
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} |
316 |
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|
317 |
root |
1.1 |
static struct ttyconf { |
318 |
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gid_t gid; |
319 |
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mode_t mode; |
320 |
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321 |
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ttyconf () |
322 |
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{ |
323 |
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#ifdef TTY_GID_SUPPORT |
324 |
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struct group *gr = getgrnam ("tty"); |
325 |
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|
326 |
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if (gr) |
327 |
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{ /* change group ownership of tty to "tty" */ |
328 |
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mode = S_IRUSR | S_IWUSR | S_IWGRP; |
329 |
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gid = gr->gr_gid; |
330 |
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} |
331 |
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else |
332 |
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#endif /* TTY_GID_SUPPORT */ |
333 |
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{ |
334 |
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mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
335 |
root |
1.2 |
gid = 0; |
336 |
root |
1.1 |
} |
337 |
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} |
338 |
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} ttyconf; |
339 |
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|
340 |
root |
1.4 |
ptytty_unix::ptytty_unix () |
341 |
root |
1.1 |
{ |
342 |
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name = 0; |
343 |
root |
1.2 |
#if UTMP_SUPPORT |
344 |
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cmd_pid = 0; |
345 |
root |
1.1 |
#endif |
346 |
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} |
347 |
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|
348 |
root |
1.4 |
ptytty_unix::~ptytty_unix () |
349 |
root |
1.1 |
{ |
350 |
root |
1.2 |
#if UTMP_SUPPORT |
351 |
|
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logout (); |
352 |
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#endif |
353 |
root |
1.1 |
put (); |
354 |
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} |
355 |
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|
356 |
|
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void |
357 |
root |
1.4 |
ptytty_unix::put () |
358 |
root |
1.2 |
{ |
359 |
root |
1.25 |
if (name) |
360 |
|
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{ |
361 |
|
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chmod (name, RESTORE_TTY_MODE); |
362 |
|
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chown (name, 0, ttyconf.gid); |
363 |
|
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} |
364 |
root |
1.1 |
|
365 |
root |
1.2 |
close_tty (); |
366 |
root |
1.1 |
|
367 |
root |
1.2 |
if (pty >= 0) |
368 |
|
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close (pty); |
369 |
root |
1.1 |
|
370 |
|
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free (name); |
371 |
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|
372 |
|
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pty = tty = -1; |
373 |
|
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name = 0; |
374 |
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} |
375 |
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|
376 |
|
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bool |
377 |
root |
1.4 |
ptytty_unix::get () |
378 |
root |
1.1 |
{ |
379 |
|
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/* get master (pty) */ |
380 |
|
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if ((pty = get_pty (&tty, &name)) < 0) |
381 |
|
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return false; |
382 |
|
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|
383 |
|
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fcntl (pty, F_SETFL, O_NONBLOCK); |
384 |
|
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|
385 |
|
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/* get slave (tty) */ |
386 |
|
|
if (tty < 0) |
387 |
|
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{ |
388 |
|
|
#ifndef NO_SETOWNER_TTYDEV |
389 |
root |
1.2 |
chown (name, getuid (), ttyconf.gid); /* fail silently */ |
390 |
|
|
chmod (name, ttyconf.mode); |
391 |
|
|
# ifdef HAVE_REVOKE |
392 |
|
|
revoke (name); |
393 |
|
|
# endif |
394 |
root |
1.1 |
#endif |
395 |
|
|
|
396 |
|
|
if ((tty = get_tty (name)) < 0) |
397 |
|
|
{ |
398 |
|
|
put (); |
399 |
|
|
return false; |
400 |
|
|
} |
401 |
|
|
} |
402 |
|
|
|
403 |
|
|
return true; |
404 |
|
|
} |
405 |
|
|
|