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/*--------------------------------*-C-*---------------------------------* |
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* 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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* 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 |
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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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|
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#include "../config.h" /* NECESSARY */ |
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#include "rxvt.h" |
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|
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#include <cstdlib> |
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#include <cstring> |
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|
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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|
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#ifdef HAVE_SYS_IOCTL_H |
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# include <sys/ioctl.h> |
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#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 */ |
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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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#if defined(HAVE_PTY_H) |
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# include <pty.h> |
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#elif defined(HAVE_LIBUTIL_H) |
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# include <libutil.h> |
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#elif defined(HAVE_UTIL_H) |
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# include <util.h> |
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#endif |
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|
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#include <cstdio> |
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#include <grp.h> |
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|
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#include "rxvtutil.h" |
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#include "fdpass.h" |
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#include "ptytty.h" |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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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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* Returns pty file descriptor, or -1 on failure |
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* 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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static inline int |
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get_pty_streams (int *fd_tty, char **ttydev) |
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{ |
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#ifdef NO_SETOWNER_TTYDEV |
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int pfd; |
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|
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# if defined(PTYS_ARE_GETPT) |
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pfd = getpt(); |
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# elif defined(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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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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|
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close (pfd); |
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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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static inline int |
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get_pty_openpty (int *fd_tty, char **ttydev) |
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{ |
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#ifdef PTYS_ARE_OPENPTY |
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int pfd; |
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int res; |
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char tty_name[sizeof "/dev/pts/????\0"]; |
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|
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res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
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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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return -1; |
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} |
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|
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static inline int |
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get_pty__getpty (int *fd_tty, char **ttydev) |
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{ |
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#ifdef PTYS_ARE__GETPTY |
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int pfd; |
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|
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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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return -1; |
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} |
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|
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static inline int |
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get_pty_ptc (int *fd_tty, char **ttydev) |
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{ |
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#ifdef PTYS_ARE_PTC |
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int pfd; |
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|
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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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return -1; |
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} |
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|
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static inline int |
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get_pty_clone (int *fd_tty, char **ttydev) |
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{ |
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#ifdef PTYS_ARE_CLONE |
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int pfd; |
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|
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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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return -1; |
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} |
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|
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static inline int |
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get_pty_numeric (int *fd_tty, char **ttydev) |
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{ |
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#ifdef PTYS_ARE_NUMERIC |
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int pfd; |
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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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|
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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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|
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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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#endif |
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|
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return -1; |
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} |
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|
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static inline int |
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get_pty_searched (int *fd_tty, char **ttydev) |
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{ |
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#ifdef PTYS_ARE_SEARCHED |
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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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int pfd; |
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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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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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|
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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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|
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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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return -1; |
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} |
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|
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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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|
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if ((pfd = get_pty_streams (fd_tty, ttydev)) != -1 |
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|| (pfd = get_pty_openpty (fd_tty, ttydev)) != -1 |
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|| (pfd = get_pty__getpty (fd_tty, ttydev)) != -1 |
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|| (pfd = get_pty_ptc (fd_tty, ttydev)) != -1 |
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|| (pfd = get_pty_clone (fd_tty, ttydev)) != -1 |
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|| (pfd = get_pty_numeric (fd_tty, ttydev)) != -1 |
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|| (pfd = get_pty_searched (fd_tty, ttydev)) != -1) |
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return pfd; |
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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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setsid (); |
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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 |
298 |
*/ |
299 |
# 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 |
308 |
|
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ioctl (fd_tty, TIOCSCTTY, NULL); |
310 |
|
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int fd = open ("/dev/tty", O_WRONLY); |
312 |
if (fd < 0) |
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return -1; /* fatal */ |
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|
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close (fd); |
316 |
|
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return 0; |
318 |
} |
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|
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void |
321 |
rxvt_ptytty::close_tty () |
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{ |
323 |
if (tty < 0) |
324 |
return; |
325 |
|
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close (tty); |
327 |
tty = -1; |
328 |
} |
329 |
|
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bool |
331 |
rxvt_ptytty::make_controlling_tty () |
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{ |
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return control_tty (tty) >= 0; |
334 |
} |
335 |
|
336 |
void |
337 |
rxvt_ptytty::set_utf8_mode (bool on) |
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{ |
339 |
#ifdef IUTF8 |
340 |
if (pty < 0) |
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return; |
342 |
|
343 |
struct termios tio; |
344 |
|
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if (tcgetattr (pty, &tio) != -1) |
346 |
{ |
347 |
tcflag_t new_cflag = tio.c_iflag; |
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|
349 |
if (on) |
350 |
new_cflag |= IUTF8; |
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else |
352 |
new_cflag &= ~IUTF8; |
353 |
|
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if (new_cflag != tio.c_iflag) |
355 |
{ |
356 |
tio.c_iflag = new_cflag; |
357 |
tcsetattr (pty, TCSANOW, &tio); |
358 |
} |
359 |
} |
360 |
#endif |
361 |
} |
362 |
|
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///////////////////////////////////////////////////////////////////////////// |
364 |
|
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#ifndef NO_SETOWNER_TTYDEV |
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static struct ttyconf { |
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gid_t gid; |
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mode_t mode; |
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|
370 |
ttyconf () |
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{ |
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#ifdef TTY_GID_SUPPORT |
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struct group *gr = getgrnam ("tty"); |
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|
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if (gr) |
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{ /* change group ownership of tty to "tty" */ |
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mode = S_IRUSR | S_IWUSR | S_IWGRP; |
378 |
gid = gr->gr_gid; |
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} |
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else |
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#endif /* TTY_GID_SUPPORT */ |
382 |
{ |
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mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
384 |
gid = getgid (); |
385 |
} |
386 |
} |
387 |
} ttyconf; |
388 |
|
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///////////////////////////////////////////////////////////////////////////// |
390 |
|
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void |
392 |
rxvt_ptytty_unix::privileges (rxvt_privaction action) |
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{ |
394 |
if (!name || !*name) |
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return; |
396 |
|
397 |
if (action == SAVE) |
398 |
{ |
399 |
# ifndef RESET_TTY_TO_COMMON_DEFAULTS |
400 |
/* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */ |
401 |
if (lstat (name, &savestat) < 0) /* you lose out */ |
402 |
; |
403 |
else |
404 |
# endif |
405 |
{ |
406 |
saved = true; |
407 |
chown (name, getuid (), ttyconf.gid); /* fail silently */ |
408 |
chmod (name, ttyconf.mode); |
409 |
# ifdef HAVE_REVOKE |
410 |
revoke (name); |
411 |
# endif |
412 |
} |
413 |
} |
414 |
else |
415 |
{ /* action == RESTORE */ |
416 |
# ifndef RESET_TTY_TO_COMMON_DEFAULTS |
417 |
if (saved) |
418 |
{ |
419 |
chmod (name, savestat.st_mode); |
420 |
chown (name, savestat.st_uid, savestat.st_gid); |
421 |
} |
422 |
# else |
423 |
chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)); |
424 |
chown (name, 0, 0); |
425 |
# endif |
426 |
} |
427 |
} |
428 |
#endif |
429 |
|
430 |
rxvt_ptytty_unix::rxvt_ptytty_unix () |
431 |
{ |
432 |
pty = tty = -1; |
433 |
name = 0; |
434 |
#ifndef NO_SETOWNER_TTYDEV |
435 |
saved = false; |
436 |
#endif |
437 |
#if UTMP_SUPPORT |
438 |
cmd_pid = 0; |
439 |
#endif |
440 |
} |
441 |
|
442 |
rxvt_ptytty_unix::~rxvt_ptytty_unix () |
443 |
{ |
444 |
#if UTMP_SUPPORT |
445 |
logout (); |
446 |
#endif |
447 |
put (); |
448 |
} |
449 |
|
450 |
void |
451 |
rxvt_ptytty_unix::put () |
452 |
{ |
453 |
#ifndef NO_SETOWNER_TTYDEV |
454 |
privileges (RESTORE); |
455 |
#endif |
456 |
|
457 |
if (pty >= 0) close (pty); |
458 |
close_tty (); |
459 |
free (name); |
460 |
|
461 |
pty = tty = -1; |
462 |
name = 0; |
463 |
} |
464 |
|
465 |
bool |
466 |
rxvt_ptytty_unix::get () |
467 |
{ |
468 |
/* get master (pty) */ |
469 |
if ((pty = get_pty (&tty, &name)) < 0) |
470 |
return false; |
471 |
|
472 |
fcntl (pty, F_SETFL, O_NONBLOCK); |
473 |
|
474 |
/* get slave (tty) */ |
475 |
if (tty < 0) |
476 |
{ |
477 |
#ifndef NO_SETOWNER_TTYDEV |
478 |
privileges (SAVE); |
479 |
#endif |
480 |
|
481 |
if ((tty = get_tty (name)) < 0) |
482 |
{ |
483 |
put (); |
484 |
return false; |
485 |
} |
486 |
} |
487 |
|
488 |
return true; |
489 |
} |
490 |
|
491 |
#if PTYTTY_HELPER |
492 |
|
493 |
static int sock_fd; |
494 |
static int pid; |
495 |
|
496 |
struct command |
497 |
{ |
498 |
enum { get, login, destroy } type; |
499 |
|
500 |
rxvt_ptytty *id; |
501 |
|
502 |
bool login_shell; |
503 |
int cmd_pid; |
504 |
char hostname[512]; // arbitrary, but should be plenty |
505 |
}; |
506 |
|
507 |
struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty |
508 |
{ |
509 |
rxvt_ptytty *id; |
510 |
|
511 |
~rxvt_ptytty_proxy (); |
512 |
|
513 |
bool get (); |
514 |
void login (int cmd_pid, bool login_shell, const char *hostname); |
515 |
}; |
516 |
|
517 |
bool |
518 |
rxvt_ptytty_proxy::get () |
519 |
{ |
520 |
command cmd; |
521 |
|
522 |
cmd.type = command::get; |
523 |
|
524 |
write (sock_fd, &cmd, sizeof (cmd)); |
525 |
|
526 |
if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
527 |
rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n"); |
528 |
|
529 |
if (!id) |
530 |
return false; |
531 |
|
532 |
if ((pty = rxvt_recv_fd (sock_fd)) < 0 |
533 |
|| (tty = rxvt_recv_fd (sock_fd)) < 0) |
534 |
rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
535 |
|
536 |
return true; |
537 |
} |
538 |
|
539 |
void |
540 |
rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
541 |
{ |
542 |
command cmd; |
543 |
|
544 |
cmd.type = command::login; |
545 |
cmd.id = id; |
546 |
cmd.cmd_pid = cmd_pid; |
547 |
cmd.login_shell = login_shell; |
548 |
strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
549 |
|
550 |
write (sock_fd, &cmd, sizeof (cmd)); |
551 |
} |
552 |
|
553 |
rxvt_ptytty_proxy::~rxvt_ptytty_proxy () |
554 |
{ |
555 |
command cmd; |
556 |
|
557 |
cmd.type = command::destroy; |
558 |
cmd.id = id; |
559 |
|
560 |
write (sock_fd, &cmd, sizeof (cmd)); |
561 |
} |
562 |
|
563 |
static |
564 |
void serve () |
565 |
{ |
566 |
command cmd; |
567 |
vector<rxvt_ptytty *> ptys; |
568 |
|
569 |
while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command)) |
570 |
{ |
571 |
if (cmd.type == command::get) |
572 |
{ |
573 |
// -> id ptyfd ttyfd |
574 |
cmd.id = new rxvt_ptytty_unix; |
575 |
|
576 |
if (cmd.id->get ()) |
577 |
{ |
578 |
write (sock_fd, &cmd.id, sizeof (cmd.id)); |
579 |
ptys.push_back (cmd.id); |
580 |
|
581 |
rxvt_send_fd (sock_fd, cmd.id->pty); |
582 |
rxvt_send_fd (sock_fd, cmd.id->tty); |
583 |
} |
584 |
else |
585 |
{ |
586 |
delete cmd.id; |
587 |
cmd.id = 0; |
588 |
write (sock_fd, &cmd.id, sizeof (cmd.id)); |
589 |
} |
590 |
} |
591 |
else if (cmd.type == command::login) |
592 |
{ |
593 |
#if UTMP_SUPPORT |
594 |
if (find (ptys.begin (), ptys.end (), cmd.id)) |
595 |
{ |
596 |
cmd.hostname[sizeof (cmd.hostname) - 1] = 0; |
597 |
cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname); |
598 |
} |
599 |
#endif |
600 |
} |
601 |
else if (cmd.type == command::destroy) |
602 |
{ |
603 |
rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id); |
604 |
|
605 |
if (pty) |
606 |
{ |
607 |
delete *pty; |
608 |
ptys.erase (pty); |
609 |
} |
610 |
} |
611 |
else |
612 |
break; |
613 |
} |
614 |
|
615 |
// destroy all ptys |
616 |
for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); ) |
617 |
delete *i; |
618 |
} |
619 |
|
620 |
void rxvt_ptytty_server () |
621 |
{ |
622 |
int sv[2]; |
623 |
|
624 |
if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
625 |
rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
626 |
|
627 |
pid = fork (); |
628 |
|
629 |
if (pid < 0) |
630 |
rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
631 |
|
632 |
if (pid) |
633 |
{ |
634 |
// client, urxvt |
635 |
sock_fd = sv[0]; |
636 |
close (sv[1]); |
637 |
fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
638 |
} |
639 |
else |
640 |
{ |
641 |
// server, pty-helper |
642 |
sock_fd = sv[1]; |
643 |
|
644 |
for (int fd = 0; fd < 1023; fd++) |
645 |
if (fd != sock_fd) |
646 |
close (fd); |
647 |
|
648 |
serve (); |
649 |
_exit (EXIT_SUCCESS); |
650 |
} |
651 |
} |
652 |
#endif |
653 |
|
654 |
// a "factory" *g* |
655 |
rxvt_ptytty * |
656 |
rxvt_new_ptytty () |
657 |
{ |
658 |
#if PTYTTY_HELPER |
659 |
if (pid > 0) |
660 |
// use helper process |
661 |
return new rxvt_ptytty_proxy; |
662 |
else |
663 |
#endif |
664 |
return new rxvt_ptytty_unix; |
665 |
} |
666 |
|
667 |
/*----------------------- end-of-file (C source) -----------------------*/ |
668 |
|