| 1 |
/*--------------------------------*-C-*---------------------------------* |
| 2 |
* File: ptytty.C |
| 3 |
*----------------------------------------------------------------------* |
| 4 |
* |
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* All portions of code are copyright by their respective author/s. |
| 6 |
* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
| 7 |
* Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
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* |
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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 |
| 11 |
* the Free Software Foundation; either version 2 of the License, or |
| 12 |
* (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 |
| 16 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 |
* 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 |
| 20 |
* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 22 |
*---------------------------------------------------------------------*/ |
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|
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#include "../config.h" /* NECESSARY */ |
| 25 |
#include "rxvt.h" |
| 26 |
|
| 27 |
#include <cstdlib> |
| 28 |
#include <cstring> |
| 29 |
|
| 30 |
#include <sys/types.h> |
| 31 |
#include <sys/socket.h> |
| 32 |
#include <unistd.h> |
| 33 |
#include <fcntl.h> |
| 34 |
|
| 35 |
#ifdef HAVE_SYS_IOCTL_H |
| 36 |
# include <sys/ioctl.h> |
| 37 |
#endif |
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#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H) |
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# include <sys/stropts.h> /* for I_PUSH */ |
| 40 |
#endif |
| 41 |
#ifdef HAVE_ISASTREAM |
| 42 |
# include <stropts.h> |
| 43 |
#endif |
| 44 |
#if defined(HAVE_PTY_H) |
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# include <pty.h> |
| 46 |
#elif defined(HAVE_LIBUTIL_H) |
| 47 |
# include <libutil.h> |
| 48 |
#elif defined(HAVE_UTIL_H) |
| 49 |
# include <util.h> |
| 50 |
#endif |
| 51 |
|
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#include <cstdio> |
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#include <grp.h> |
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|
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#include "rxvtutil.h" |
| 56 |
#include "fdpass.h" |
| 57 |
#include "ptytty.h" |
| 58 |
|
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///////////////////////////////////////////////////////////////////////////// |
| 60 |
|
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/* ------------------------------------------------------------------------- * |
| 62 |
* GET PSEUDO TELETYPE - MASTER AND SLAVE * |
| 63 |
* ------------------------------------------------------------------------- */ |
| 64 |
/* |
| 65 |
* Returns pty file descriptor, or -1 on failure |
| 66 |
* If successful, ttydev is set to the name of the slave device. |
| 67 |
* fd_tty _may_ also be set to an open fd to the slave device |
| 68 |
*/ |
| 69 |
static int |
| 70 |
get_pty (int *fd_tty, char **ttydev) |
| 71 |
{ |
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int pfd; |
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|
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#ifdef PTYS_ARE_OPENPTY |
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char tty_name[sizeof "/dev/pts/????\0"]; |
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|
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rxvt_privileges(RESTORE); |
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int res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
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rxvt_privileges(IGNORE); |
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|
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if (res != -1) |
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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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#endif |
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|
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#ifdef PTYS_ARE__GETPTY |
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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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#endif |
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|
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#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) |
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# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_POSIX) || defined(PTYS_ARE_PTMX) |
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|
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{ |
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# ifdef PTYS_ARE_GETPT |
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pfd = getpt(); |
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# else |
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# ifdef PTYS_ARE_POSIX |
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pfd = posix_openpt (O_RDWR); |
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# else |
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pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); |
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# endif |
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# endif |
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|
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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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} |
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# endif |
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#endif |
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|
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#ifdef PTYS_ARE_PTC |
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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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#endif |
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|
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#ifdef PTYS_ARE_CLONE |
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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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#endif |
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|
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#ifdef PTYS_ARE_NUMERIC |
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{ |
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int idx; |
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char *c1, *c2; |
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char pty_name[] = "/dev/ptyp???"; |
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char tty_name[] = "/dev/ttyp???"; |
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|
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c1 = &(pty_name[sizeof (pty_name) - 4]); |
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c2 = &(tty_name[sizeof (tty_name) - 4]); |
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for (idx = 0; idx < 256; idx++) |
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{ |
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sprintf (c1, "%d", idx); |
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sprintf (c2, "%d", idx); |
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if (access (tty_name, F_OK) < 0) |
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{ |
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idx = 256; |
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break; |
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} |
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|
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if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
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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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|
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close (pfd); |
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} |
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} |
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} |
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#endif |
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|
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#ifdef PTYS_ARE_SEARCHED |
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{ |
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const char *c1, *c2; |
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char pty_name[] = "/dev/pty??"; |
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char tty_name[] = "/dev/tty??"; |
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|
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# ifndef PTYCHAR1 |
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# define PTYCHAR1 "pqrstuvwxyz" |
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# endif |
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# ifndef PTYCHAR2 |
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# define PTYCHAR2 "0123456789abcdef" |
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# endif |
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|
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for (c1 = PTYCHAR1; *c1; c1++) |
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{ |
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pty_name[ (sizeof (pty_name) - 3)] = |
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tty_name[ (sizeof (pty_name) - 3)] = *c1; |
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for (c2 = PTYCHAR2; *c2; c2++) |
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{ |
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pty_name[ (sizeof (pty_name) - 2)] = |
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tty_name[ (sizeof (pty_name) - 2)] = *c2; |
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if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
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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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|
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close (pfd); |
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} |
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} |
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} |
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} |
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#endif |
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|
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return -1; |
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} |
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|
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/*----------------------------------------------------------------------*/ |
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/* |
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* Returns tty file descriptor, or -1 on failure |
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*/ |
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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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/* |
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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 |
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control_tty (int fd_tty) |
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{ |
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int fd; |
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|
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/* ---------------------------------------- */ |
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setsid (); |
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|
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/* ---------------------------------------- */ |
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# if defined(PTYS_ARE_PTMX) && defined(I_PUSH) |
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/* |
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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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*/ |
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# ifdef HAVE_ISASTREAM |
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if (isastream (fd_tty) == 1) |
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# endif |
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{ |
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ioctl (fd_tty, I_PUSH, "ptem"); |
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ioctl (fd_tty, I_PUSH, "ldterm"); |
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ioctl (fd_tty, I_PUSH, "ttcompat"); |
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} |
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# endif |
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/* ---------------------------------------- */ |
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fd = ioctl (fd_tty, TIOCSCTTY, NULL); |
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/* ---------------------------------------- */ |
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fd = open ("/dev/tty", O_WRONLY); |
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if (fd < 0) |
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return -1; /* fatal */ |
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close (fd); |
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/* ---------------------------------------- */ |
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|
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return 0; |
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} |
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|
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void |
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rxvt_ptytty::close_tty () |
| 274 |
{ |
| 275 |
if (tty < 0) |
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return; |
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|
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close (tty); |
| 279 |
tty = -1; |
| 280 |
} |
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|
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bool |
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rxvt_ptytty::make_controlling_tty () |
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{ |
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return control_tty (tty) >= 0; |
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} |
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|
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void |
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rxvt_ptytty::set_utf8_mode (bool on) |
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{ |
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#ifdef IUTF8 |
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if (pty < 0) |
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return; |
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|
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struct termios tio; |
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|
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if (tcgetattr (pty, &tio) != -1) |
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{ |
| 299 |
tcflag_t new_cflag = tio.c_iflag; |
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|
| 301 |
if (on) |
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new_cflag |= IUTF8; |
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else |
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new_cflag &= ~IUTF8; |
| 305 |
|
| 306 |
if (new_cflag != tio.c_iflag) |
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{ |
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tio.c_iflag = new_cflag; |
| 309 |
tcsetattr (pty, TCSANOW, &tio); |
| 310 |
} |
| 311 |
} |
| 312 |
#endif |
| 313 |
} |
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|
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///////////////////////////////////////////////////////////////////////////// |
| 316 |
|
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#ifndef NO_SETOWNER_TTYDEV |
| 318 |
static struct ttyconf { |
| 319 |
gid_t gid; |
| 320 |
mode_t mode; |
| 321 |
|
| 322 |
ttyconf () |
| 323 |
{ |
| 324 |
#ifdef TTY_GID_SUPPORT |
| 325 |
struct group *gr = getgrnam ("tty"); |
| 326 |
|
| 327 |
if (gr) |
| 328 |
{ /* change group ownership of tty to "tty" */ |
| 329 |
mode = S_IRUSR | S_IWUSR | S_IWGRP; |
| 330 |
gid = gr->gr_gid; |
| 331 |
} |
| 332 |
else |
| 333 |
#endif /* TTY_GID_SUPPORT */ |
| 334 |
{ |
| 335 |
mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
| 336 |
gid = getgid (); |
| 337 |
} |
| 338 |
} |
| 339 |
} ttyconf; |
| 340 |
|
| 341 |
///////////////////////////////////////////////////////////////////////////// |
| 342 |
|
| 343 |
void |
| 344 |
rxvt_ptytty_unix::privileges (rxvt_privaction action) |
| 345 |
{ |
| 346 |
if (!name || !*name) |
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return; |
| 348 |
|
| 349 |
rxvt_privileges (RESTORE); |
| 350 |
|
| 351 |
if (action == SAVE) |
| 352 |
{ |
| 353 |
# ifndef RESET_TTY_TO_COMMON_DEFAULTS |
| 354 |
/* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */ |
| 355 |
if (lstat (name, &savestat) < 0) /* you lose out */ |
| 356 |
; |
| 357 |
else |
| 358 |
# endif |
| 359 |
{ |
| 360 |
saved = true; |
| 361 |
chown (name, getuid (), ttyconf.gid); /* fail silently */ |
| 362 |
chmod (name, ttyconf.mode); |
| 363 |
# ifdef HAVE_REVOKE |
| 364 |
revoke (name); |
| 365 |
# endif |
| 366 |
} |
| 367 |
} |
| 368 |
else |
| 369 |
{ /* action == RESTORE */ |
| 370 |
# ifndef RESET_TTY_TO_COMMON_DEFAULTS |
| 371 |
if (saved) |
| 372 |
{ |
| 373 |
chmod (name, savestat.st_mode); |
| 374 |
chown (name, savestat.st_uid, savestat.st_gid); |
| 375 |
} |
| 376 |
# else |
| 377 |
chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)); |
| 378 |
chown (name, 0, 0); |
| 379 |
# endif |
| 380 |
|
| 381 |
} |
| 382 |
|
| 383 |
rxvt_privileges (IGNORE); |
| 384 |
} |
| 385 |
#endif |
| 386 |
|
| 387 |
rxvt_ptytty_unix::rxvt_ptytty_unix () |
| 388 |
{ |
| 389 |
pty = tty = -1; |
| 390 |
name = 0; |
| 391 |
#ifndef NO_SETOWNER_TTYDEV |
| 392 |
saved = false; |
| 393 |
#endif |
| 394 |
#if UTMP_SUPPORT |
| 395 |
cmd_pid = 0; |
| 396 |
#endif |
| 397 |
} |
| 398 |
|
| 399 |
rxvt_ptytty_unix::~rxvt_ptytty_unix () |
| 400 |
{ |
| 401 |
logout (); |
| 402 |
put (); |
| 403 |
} |
| 404 |
|
| 405 |
void |
| 406 |
rxvt_ptytty_unix::put () |
| 407 |
{ |
| 408 |
#ifndef NO_SETOWNER_TTYDEV |
| 409 |
privileges (RESTORE); |
| 410 |
#endif |
| 411 |
|
| 412 |
if (pty >= 0) close (pty); |
| 413 |
close_tty (); |
| 414 |
free (name); |
| 415 |
|
| 416 |
pty = tty = -1; |
| 417 |
name = 0; |
| 418 |
} |
| 419 |
|
| 420 |
bool |
| 421 |
rxvt_ptytty_unix::get () |
| 422 |
{ |
| 423 |
/* get master (pty) */ |
| 424 |
if ((pty = get_pty (&tty, &name)) < 0) |
| 425 |
return false; |
| 426 |
|
| 427 |
fcntl (pty, F_SETFL, O_NONBLOCK); |
| 428 |
|
| 429 |
/* get slave (tty) */ |
| 430 |
if (tty < 0) |
| 431 |
{ |
| 432 |
#ifndef NO_SETOWNER_TTYDEV |
| 433 |
privileges (SAVE); |
| 434 |
#endif |
| 435 |
|
| 436 |
if ((tty = get_tty (name)) < 0) |
| 437 |
{ |
| 438 |
put (); |
| 439 |
return false; |
| 440 |
} |
| 441 |
} |
| 442 |
|
| 443 |
return true; |
| 444 |
} |
| 445 |
|
| 446 |
#if PTYTTY_HELPER |
| 447 |
|
| 448 |
static int sock_fd; |
| 449 |
static int pid; |
| 450 |
|
| 451 |
struct command |
| 452 |
{ |
| 453 |
enum { get, login, destroy } type; |
| 454 |
|
| 455 |
rxvt_ptytty *id; |
| 456 |
|
| 457 |
bool login_shell; |
| 458 |
int cmd_pid; |
| 459 |
char hostname[512]; // arbitrary, but should be plenty |
| 460 |
}; |
| 461 |
|
| 462 |
struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty |
| 463 |
{ |
| 464 |
rxvt_ptytty *id; |
| 465 |
|
| 466 |
rxvt_ptytty_proxy (); |
| 467 |
~rxvt_ptytty_proxy (); |
| 468 |
|
| 469 |
bool get (); |
| 470 |
void login (int cmd_pid, bool login_shell, const char *hostname); |
| 471 |
}; |
| 472 |
|
| 473 |
bool |
| 474 |
rxvt_ptytty_proxy::get () |
| 475 |
{ |
| 476 |
command cmd; |
| 477 |
|
| 478 |
cmd.type = command::get; |
| 479 |
|
| 480 |
write (sock_fd, &cmd, sizeof (cmd)); |
| 481 |
|
| 482 |
if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
| 483 |
rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n"); |
| 484 |
|
| 485 |
if (!id) |
| 486 |
return false; |
| 487 |
|
| 488 |
if ((pty = rxvt_recv_fd (sock_fd)) < 0 |
| 489 |
|| (tty = rxvt_recv_fd (sock_fd)) < 0) |
| 490 |
rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
| 491 |
|
| 492 |
return true; |
| 493 |
} |
| 494 |
|
| 495 |
void |
| 496 |
rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
| 497 |
{ |
| 498 |
command cmd; |
| 499 |
|
| 500 |
cmd.type = command::login; |
| 501 |
cmd.id = id; |
| 502 |
cmd.cmd_pid = cmd_pid; |
| 503 |
cmd.login_shell = login_shell; |
| 504 |
strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
| 505 |
|
| 506 |
write (sock_fd, &cmd, sizeof (cmd)); |
| 507 |
} |
| 508 |
|
| 509 |
rxvt_ptytty_proxy::~rxvt_ptytty_proxy () |
| 510 |
{ |
| 511 |
command cmd; |
| 512 |
|
| 513 |
cmd.type = command::destroy; |
| 514 |
cmd.id = id; |
| 515 |
|
| 516 |
write (sock_fd, &cmd, sizeof (cmd)); |
| 517 |
} |
| 518 |
|
| 519 |
static |
| 520 |
void serve () |
| 521 |
{ |
| 522 |
command cmd; |
| 523 |
vector<rxvt_ptytty *> ptys; |
| 524 |
|
| 525 |
while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command)) |
| 526 |
{ |
| 527 |
if (cmd.type == command::get) |
| 528 |
{ |
| 529 |
// -> id ptyfd ttyfd |
| 530 |
cmd.id = new rxvt_ptytty_unix; |
| 531 |
|
| 532 |
if (cmd.id->get ()) |
| 533 |
{ |
| 534 |
write (sock_fd, &cmd.id, sizeof (cmd.id)); |
| 535 |
ptys.push_back (cmd.id); |
| 536 |
|
| 537 |
rxvt_send_fd (sock_fd, cmd.id->pty); |
| 538 |
rxvt_send_fd (sock_fd, cmd.id->tty); |
| 539 |
} |
| 540 |
else |
| 541 |
{ |
| 542 |
delete cmd.id; |
| 543 |
cmd.id = 0; |
| 544 |
write (sock_fd, &cmd.id, sizeof (cmd.id)); |
| 545 |
} |
| 546 |
} |
| 547 |
else if (cmd.type == command::login) |
| 548 |
{ |
| 549 |
if (find (ptys.begin (), ptys.end (), cmd.id)) |
| 550 |
{ |
| 551 |
cmd.hostname[sizeof (cmd.hostname) - 1] = 0; |
| 552 |
cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname); |
| 553 |
} |
| 554 |
else printf ("xxx hiya login no match %p\n", cmd.id); |
| 555 |
} |
| 556 |
else if (cmd.type == command::destroy) |
| 557 |
{ |
| 558 |
rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id); |
| 559 |
|
| 560 |
if (*pty) |
| 561 |
{ |
| 562 |
ptys.erase (pty); |
| 563 |
delete *pty; |
| 564 |
} |
| 565 |
else printf ("xxx hiya destroy no match %p\n", cmd.id); |
| 566 |
} |
| 567 |
else |
| 568 |
break; |
| 569 |
} |
| 570 |
|
| 571 |
// destroy all ptys |
| 572 |
for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); ) |
| 573 |
delete *i; |
| 574 |
} |
| 575 |
|
| 576 |
void rxvt_ptytty_server () |
| 577 |
{ |
| 578 |
int sv[2]; |
| 579 |
|
| 580 |
if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
| 581 |
rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
| 582 |
|
| 583 |
pid = fork (); |
| 584 |
|
| 585 |
if (pid < 0) |
| 586 |
rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
| 587 |
|
| 588 |
if (pid) |
| 589 |
{ |
| 590 |
// client, urxvt |
| 591 |
sock_fd = sv[0]; |
| 592 |
close (sv[1]); |
| 593 |
fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
| 594 |
} |
| 595 |
else |
| 596 |
{ |
| 597 |
// server, pty-helper |
| 598 |
sock_fd = sv[1]; |
| 599 |
|
| 600 |
close (sv[0]);//D |
| 601 |
// for (int fd = 0; fd < 1023; fd++) |
| 602 |
// if (fd != sock_fd) |
| 603 |
// close (fd); |
| 604 |
|
| 605 |
serve (); |
| 606 |
_exit (EXIT_SUCCESS); |
| 607 |
} |
| 608 |
} |
| 609 |
#endif |
| 610 |
|
| 611 |
// a "factory" *g* |
| 612 |
rxvt_ptytty * |
| 613 |
rxvt_new_ptytty () |
| 614 |
{ |
| 615 |
#if PTYTTY_HELPER |
| 616 |
if (pid > 0) |
| 617 |
{ |
| 618 |
// use helper process |
| 619 |
return new rxvt_ptytty_proxy; |
| 620 |
} |
| 621 |
else |
| 622 |
#endif |
| 623 |
return new rxvt_ptytty_unix; |
| 624 |
} |
| 625 |
|
| 626 |
/*----------------------- end-of-file (C source) -----------------------*/ |
| 627 |
|
