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Comparing libptytty/src/ptytty.C (file contents):
Revision 1.29 by ayin, Thu Jun 28 17:41:01 2007 UTC vs.
Revision 1.52 by sf-exg, Thu Jan 19 20:07:14 2012 UTC

1// This file is part of libptytty. Do not make local modifications.
2// http://software.schmorp.de/pkg/libptytty
3
4/*----------------------------------------------------------------------* 1/*----------------------------------------------------------------------*
5 * File: ptytty.C 2 * File: ptytty.C
6 *----------------------------------------------------------------------* 3 *----------------------------------------------------------------------*
7 * 4 *
8 * All portions of code are copyright by their respective author/s. 5 * All portions of code are copyright by their respective author/s.
9 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> 6 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
10 * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> 7 * Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de>
11 * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> 8 * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it>
12 * 9 *
13 * This program is free software; you can redistribute it and/or modify 10 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by 11 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or 12 * the Free Software Foundation; either version 2 of the License, or
… …
23 * You should have received a copy of the GNU General Public License 20 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software 21 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 *---------------------------------------------------------------------*/ 23 *---------------------------------------------------------------------*/
27 24
28#include "../config.h" 25#include "config.h"
29 26
30#include "ptytty.h" 27#include "ptytty.h"
31 28
32#include <cstdlib> 29#include <stdlib.h>
30#include <stdio.h>
33#include <cstring> 31#include <string.h>
34#include <csignal>
35 32
36#include <sys/types.h> 33#include <sys/types.h>
34#include <sys/stat.h>
37#include <unistd.h> 35#include <unistd.h>
38#include <fcntl.h> 36#include <fcntl.h>
39 37
40#ifdef HAVE_SYS_IOCTL_H 38#ifdef HAVE_SYS_IOCTL_H
41# include <sys/ioctl.h> 39# include <sys/ioctl.h>
42#endif 40#endif
43#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) 41#ifdef HAVE_STROPTS_H
44# include <sys/stropts.h> /* for I_PUSH */
45#endif
46#ifdef HAVE_ISASTREAM
47# include <stropts.h> 42# include <stropts.h>
48#endif 43#endif
49#if defined(HAVE_PTY_H) 44#if defined(HAVE_PTY_H)
50# include <pty.h> 45# include <pty.h>
51#elif defined(HAVE_LIBUTIL_H) 46#elif defined(HAVE_LIBUTIL_H)
… …
55#endif 50#endif
56#ifdef TTY_GID_SUPPORT 51#ifdef TTY_GID_SUPPORT
57#include <grp.h> 52#include <grp.h>
58#endif 53#endif
59 54
60#include <cstdio> 55#ifndef O_NOCTTY
56# define O_NOCTTY 0
57#endif
61 58
62///////////////////////////////////////////////////////////////////////////// 59/////////////////////////////////////////////////////////////////////////////
63 60
64/* ------------------------------------------------------------------------- * 61/* ------------------------------------------------------------------------- *
65 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 62 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
… …
75 get_pty (int *fd_tty, char **ttydev) 72 get_pty (int *fd_tty, char **ttydev)
76 { 73 {
77 int pfd; 74 int pfd;
78 75
79# if defined(HAVE_GETPT) 76# if defined(HAVE_GETPT)
80 pfd = getpt(); 77 pfd = getpt ();
81# elif defined(HAVE_POSIX_OPENPT) 78# elif defined(HAVE_POSIX_OPENPT)
82 pfd = posix_openpt (O_RDWR); 79 pfd = posix_openpt (O_RDWR | O_NOCTTY);
83# else 80# else
81# ifdef _AIX
84 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); 82 pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0);
83# else
84 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
85# endif
85# endif 86# endif
86 87
87 if (pfd >= 0) 88 if (pfd >= 0)
88 { 89 {
89 if (grantpt (pfd) == 0 /* change slave permissions */ 90 if (grantpt (pfd) == 0 /* change slave permissions */
90 && unlockpt (pfd) == 0) 91 && unlockpt (pfd) == 0)
92 {
91 { /* slave now unlocked */ 93 /* slave now unlocked */
92 *ttydev = strdup (ptsname (pfd)); /* get slave's name */ 94 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
93 return pfd; 95 return pfd;
94 } 96 }
95 97
96 close (pfd); 98 close (pfd);
… …
122 124
123 static int 125 static int
124 get_pty (int *fd_tty, char **ttydev) 126 get_pty (int *fd_tty, char **ttydev)
125 { 127 {
126 int pfd; 128 int pfd;
129 char *slave;
127 130
128 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 131 slave = _getpty (&pfd, O_RDWR | O_NOCTTY, 0622, 0);
129 132
130 if (*ttydev != NULL) 133 if (slave != NULL)
131 return pfd;
132
133 return -1;
134 }
135
136#elif defined(HAVE_DEV_PTC)
137
138 static int
139 get_pty (int *fd_tty, char **ttydev)
140 {
141 int pfd;
142
143 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
144 { 134 {
145 *ttydev = strdup (ttyname (pfd));
146 return pfd;
147 }
148
149 return -1;
150 }
151
152#elif defined(HAVE_DEV_CLONE)
153
154 static int
155 get_pty (int *fd_tty, char **ttydev)
156 {
157 int pfd;
158
159 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
160 {
161 *ttydev = strdup (ptsname (pfd)); 135 *ttydev = strdup (slave);
162 return pfd; 136 return pfd;
163 } 137 }
164 138
165 return -1; 139 return -1;
166 } 140 }
… …
178 const char *majors = "pqrstuvwxyzabcde"; 152 const char *majors = "pqrstuvwxyzabcde";
179 const char *minors = "0123456789abcdef"; 153 const char *minors = "0123456789abcdef";
180 154
181 for (i = 0; i < 256; i++) 155 for (i = 0; i < 256; i++)
182 { 156 {
183 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); 157 snprintf (pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
184 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); 158 snprintf (tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
185 159
186 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 160 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
187 { 161 {
188 snprintf(pty_name, 32, "/dev/ptyp%d", i); 162 snprintf (pty_name, 32, "/dev/ptyp%d", i);
189 snprintf(tty_name, 32, "/dev/ttyp%d", i); 163 snprintf (tty_name, 32, "/dev/ttyp%d", i);
190 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 164 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
191 continue; 165 continue;
192 } 166 }
193 167
194 if (access (tty_name, R_OK | W_OK) == 0) 168 if (access (tty_name, R_OK | W_OK) == 0)
… …
224{ 198{
225 int fd; 199 int fd;
226 200
227 setsid (); 201 setsid ();
228 202
229#if defined(HAVE_DEV_PTMX) && defined(I_PUSH) 203#ifdef TIOCSCTTY
204 ioctl (fd_tty, TIOCSCTTY, NULL);
205#else
206 fd = open (ttyname (fd_tty), O_RDWR);
207 if (fd >= 0)
208 close (fd);
209#endif
210
211 fd = open ("/dev/tty", O_WRONLY);
212 if (fd < 0)
213 return -1; /* fatal */
214
215 close (fd);
216
217 return 0;
218}
219
220void
221ptytty::close_tty ()
222{
223 if (tty < 0)
224 return;
225
226 close (tty);
227 tty = -1;
228}
229
230bool
231ptytty::make_controlling_tty ()
232{
233 return control_tty (tty) >= 0;
234}
235
236void
237ptytty::set_utf8_mode (bool on)
238{
239#ifdef IUTF8
240 if (pty < 0)
241 return;
242
243 struct termios tio;
244
245 if (tcgetattr (pty, &tio) != -1)
246 {
247 tcflag_t new_cflag = tio.c_iflag;
248
249 if (on)
250 new_cflag |= IUTF8;
251 else
252 new_cflag &= ~IUTF8;
253
254 if (new_cflag != tio.c_iflag)
255 {
256 tio.c_iflag = new_cflag;
257 tcsetattr (pty, TCSANOW, &tio);
258 }
259 }
260#endif
261}
262
263static struct ttyconf {
264 gid_t gid;
265 mode_t mode;
266
267 ttyconf ()
268 {
269#ifdef TTY_GID_SUPPORT
270 struct group *gr = getgrnam ("tty");
271
272 if (gr)
273 {
274 /* change group ownership of tty to "tty" */
275 mode = S_IRUSR | S_IWUSR | S_IWGRP;
276 gid = gr->gr_gid;
277 }
278 else
279#endif /* TTY_GID_SUPPORT */
280 {
281 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
282 gid = 0;
283 }
284 }
285} ttyconf;
286
287ptytty_unix::ptytty_unix ()
288{
289 name = 0;
290#if UTMP_SUPPORT
291 cmd_pid = 0;
292#endif
293}
294
295ptytty_unix::~ptytty_unix ()
296{
297#if UTMP_SUPPORT
298 logout ();
299#endif
300 put ();
301}
302
303void
304ptytty_unix::put ()
305{
306 if (name)
307 {
308 chmod (name, RESTORE_TTY_MODE);
309 chown (name, 0, ttyconf.gid);
310 }
311
312 close_tty ();
313
314 if (pty >= 0)
315 close (pty);
316
317 free (name);
318
319 pty = tty = -1;
320 name = 0;
321}
322
323bool
324ptytty_unix::get ()
325{
326 /* get master (pty) */
327 if ((pty = get_pty (&tty, &name)) < 0)
328 return false;
329
330 /* get slave (tty) */
331 if (tty < 0)
332 {
333#ifndef NO_SETOWNER_TTYDEV
334 chown (name, getuid (), ttyconf.gid); /* fail silently */
335 chmod (name, ttyconf.mode);
336# ifdef HAVE_REVOKE
337 revoke (name);
338# endif
339#endif
340
341 if ((tty = get_tty (name)) < 0)
342 {
343 put ();
344 return false;
345 }
346 }
347
348#if defined(I_PUSH)
230 /* 349 /*
231 * Push STREAMS modules: 350 * Push STREAMS modules:
232 * ptem: pseudo-terminal hardware emulation module. 351 * ptem: pseudo-terminal hardware emulation module.
233 * ldterm: standard terminal line discipline. 352 * ldterm: standard terminal line discipline.
234 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 353 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
235 * 354 *
236 * After we push the STREAMS modules, the first open () on the slave side 355 * After we push the STREAMS modules, the first open () on the slave side
237 * (i.e. the next section between the dashes giving us "tty opened OK")
238 * should make the "ptem" (or "ldterm" depending upon either which OS 356 * should make the "ptem" (or "ldterm" depending upon either which OS
239 * version or which set of manual pages you have) module give us a 357 * version or which set of manual pages you have) module give us a
240 * controlling terminal. We must already have close ()d the master side 358 * controlling terminal. We must already have close ()d the master side
241 * fd in this child process before we push STREAMS modules on because the 359 * fd in this child process before we push STREAMS modules on because the
242 * documentation is really unclear about whether it is any close () on 360 * documentation is really unclear about whether it is any close () on
243 * the master side or the last close () - i.e. a proper STREAMS dismantling 361 * the master side or the last close () - i.e. a proper STREAMS dismantling
244 * close () - on the master side which causes a hang up to be sent 362 * close () - on the master side which causes a hang up to be sent
245 * through - Geoff Wing 363 * through - Geoff Wing
246 */ 364 */
247# ifdef HAVE_ISASTREAM 365#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
248 if (isastream (fd_tty) == 1) 366 if (isastream (tty) == 1)
249# endif 367# endif
250 { 368 {
251 ioctl (fd_tty, I_PUSH, "ptem"); 369 ioctl (tty, I_PUSH, "ptem");
252 ioctl (fd_tty, I_PUSH, "ldterm"); 370 ioctl (tty, I_PUSH, "ldterm");
253 ioctl (fd_tty, I_PUSH, "ttcompat"); 371 ioctl (tty, I_PUSH, "ttcompat");
254 }
255#endif
256
257#ifdef TIOCSCTTY
258 ioctl (fd_tty, TIOCSCTTY, NULL);
259#else
260 fd = open (ttyname (fd_tty), O_RDWR);
261 if (fd >= 0)
262 close (fd);
263#endif
264
265 fd = open ("/dev/tty", O_WRONLY);
266 if (fd < 0)
267 return -1; /* fatal */
268
269 close (fd);
270
271 return 0;
272}
273
274void
275ptytty::close_tty ()
276{
277 if (tty < 0)
278 return;
279
280 close (tty);
281 tty = -1;
282}
283
284bool
285ptytty::make_controlling_tty ()
286{
287 return control_tty (tty) >= 0;
288}
289
290void
291ptytty::set_utf8_mode (bool on)
292{
293#ifdef IUTF8
294 if (pty < 0)
295 return;
296
297 struct termios tio;
298
299 if (tcgetattr (pty, &tio) != -1)
300 { 372 }
301 tcflag_t new_cflag = tio.c_iflag;
302
303 if (on)
304 new_cflag |= IUTF8;
305 else
306 new_cflag &= ~IUTF8;
307
308 if (new_cflag != tio.c_iflag)
309 {
310 tio.c_iflag = new_cflag;
311 tcsetattr (pty, TCSANOW, &tio);
312 }
313 }
314#endif 373#endif
315}
316 374
317static struct ttyconf {
318 gid_t gid;
319 mode_t mode;
320
321 ttyconf ()
322 {
323#ifdef TTY_GID_SUPPORT
324 struct group *gr = getgrnam ("tty");
325
326 if (gr)
327 { /* change group ownership of tty to "tty" */
328 mode = S_IRUSR | S_IWUSR | S_IWGRP;
329 gid = gr->gr_gid;
330 }
331 else
332#endif /* TTY_GID_SUPPORT */
333 {
334 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
335 gid = 0;
336 }
337 }
338} ttyconf;
339
340ptytty_unix::ptytty_unix ()
341{
342 name = 0;
343#if UTMP_SUPPORT 375#if UTMP_SUPPORT
344 cmd_pid = 0; 376# if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID)
345#endif 377 int fd_stdin = dup (STDIN_FILENO);
346} 378 dup2 (tty, STDIN_FILENO);
347 379
348ptytty_unix::~ptytty_unix () 380 utmp_pos = ttyslot ();
349{
350#if UTMP_SUPPORT
351 logout ();
352#endif
353 put ();
354}
355 381
356void 382 dup2 (fd_stdin, STDIN_FILENO);
357ptytty_unix::put () 383 close (fd_stdin);
358{
359 if (name)
360 {
361 chmod (name, RESTORE_TTY_MODE);
362 chown (name, 0, ttyconf.gid);
363 }
364
365 close_tty ();
366
367 if (pty >= 0)
368 close (pty);
369
370 free (name);
371
372 pty = tty = -1;
373 name = 0;
374}
375
376bool
377ptytty_unix::get ()
378{
379 /* get master (pty) */
380 if ((pty = get_pty (&tty, &name)) < 0)
381 return false;
382
383 fcntl (pty, F_SETFL, O_NONBLOCK);
384
385 /* get slave (tty) */
386 if (tty < 0)
387 {
388#ifndef NO_SETOWNER_TTYDEV
389 chown (name, getuid (), ttyconf.gid); /* fail silently */
390 chmod (name, ttyconf.mode);
391# ifdef HAVE_REVOKE
392 revoke (name);
393# endif 384# endif
394#endif 385#endif
395 386
396 if ((tty = get_tty (name)) < 0)
397 {
398 put ();
399 return false;
400 }
401 }
402
403 return true; 387 return true;
404} 388}
405 389

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