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Comparing libptytty/src/ptytty.C (file contents):
Revision 1.31 by ayin, Thu Nov 15 10:49:05 2007 UTC vs.
Revision 1.53 by root, Thu May 22 18:54:32 2014 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 3 of the License, or
16 * (at your option) any later version. 13 * (at your option) any later version.
17 * 14 *
18 * This program is distributed in the hope that it will be useful, 15 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
… …
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);
… …
124 get_pty (int *fd_tty, char **ttydev) 126 get_pty (int *fd_tty, char **ttydev)
125 { 127 {
126 int pfd; 128 int pfd;
127 char *slave; 129 char *slave;
128 130
129 slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 131 slave = _getpty (&pfd, O_RDWR | O_NOCTTY, 0622, 0);
130 132
131 if (slave != NULL) { 133 if (slave != NULL)
132 *ttydev = strdup (slave);
133 return pfd;
134 }
135
136 return -1;
137 }
138
139#elif defined(HAVE_DEV_PTC)
140
141 static int
142 get_pty (int *fd_tty, char **ttydev)
143 {
144 int pfd;
145
146 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
147 { 134 {
148 *ttydev = strdup (ttyname (pfd));
149 return pfd;
150 }
151
152 return -1;
153 }
154
155#elif defined(HAVE_DEV_CLONE)
156
157 static int
158 get_pty (int *fd_tty, char **ttydev)
159 {
160 int pfd;
161
162 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
163 {
164 *ttydev = strdup (ptsname (pfd)); 135 *ttydev = strdup (slave);
165 return pfd; 136 return pfd;
166 } 137 }
167 138
168 return -1; 139 return -1;
169 } 140 }
… …
181 const char *majors = "pqrstuvwxyzabcde"; 152 const char *majors = "pqrstuvwxyzabcde";
182 const char *minors = "0123456789abcdef"; 153 const char *minors = "0123456789abcdef";
183 154
184 for (i = 0; i < 256; i++) 155 for (i = 0; i < 256; i++)
185 { 156 {
186 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]);
187 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]);
188 159
189 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 160 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
190 { 161 {
191 snprintf(pty_name, 32, "/dev/ptyp%d", i); 162 snprintf (pty_name, 32, "/dev/ptyp%d", i);
192 snprintf(tty_name, 32, "/dev/ttyp%d", i); 163 snprintf (tty_name, 32, "/dev/ttyp%d", i);
193 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 164 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
194 continue; 165 continue;
195 } 166 }
196 167
197 if (access (tty_name, R_OK | W_OK) == 0) 168 if (access (tty_name, R_OK | W_OK) == 0)
… …
227{ 198{
228 int fd; 199 int fd;
229 200
230 setsid (); 201 setsid ();
231 202
232#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)
233 /* 349 /*
234 * Push STREAMS modules: 350 * Push STREAMS modules:
235 * ptem: pseudo-terminal hardware emulation module. 351 * ptem: pseudo-terminal hardware emulation module.
236 * ldterm: standard terminal line discipline. 352 * ldterm: standard terminal line discipline.
237 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 353 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
238 * 354 *
239 * 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
240 * (i.e. the next section between the dashes giving us "tty opened OK")
241 * should make the "ptem" (or "ldterm" depending upon either which OS 356 * should make the "ptem" (or "ldterm" depending upon either which OS
242 * 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
243 * controlling terminal. We must already have close ()d the master side 358 * controlling terminal. We must already have close ()d the master side
244 * 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
245 * documentation is really unclear about whether it is any close () on 360 * documentation is really unclear about whether it is any close () on
246 * 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
247 * 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
248 * through - Geoff Wing 363 * through - Geoff Wing
249 */ 364 */
250# ifdef HAVE_ISASTREAM 365#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
251 if (isastream (fd_tty) == 1) 366 if (isastream (tty) == 1)
252# endif 367# endif
253 { 368 {
254 ioctl (fd_tty, I_PUSH, "ptem"); 369 ioctl (tty, I_PUSH, "ptem");
255 ioctl (fd_tty, I_PUSH, "ldterm"); 370 ioctl (tty, I_PUSH, "ldterm");
256 ioctl (fd_tty, I_PUSH, "ttcompat"); 371 ioctl (tty, I_PUSH, "ttcompat");
257 }
258#endif
259
260#ifdef TIOCSCTTY
261 ioctl (fd_tty, TIOCSCTTY, NULL);
262#else
263 fd = open (ttyname (fd_tty), O_RDWR);
264 if (fd >= 0)
265 close (fd);
266#endif
267
268 fd = open ("/dev/tty", O_WRONLY);
269 if (fd < 0)
270 return -1; /* fatal */
271
272 close (fd);
273
274 return 0;
275}
276
277void
278ptytty::close_tty ()
279{
280 if (tty < 0)
281 return;
282
283 close (tty);
284 tty = -1;
285}
286
287bool
288ptytty::make_controlling_tty ()
289{
290 return control_tty (tty) >= 0;
291}
292
293void
294ptytty::set_utf8_mode (bool on)
295{
296#ifdef IUTF8
297 if (pty < 0)
298 return;
299
300 struct termios tio;
301
302 if (tcgetattr (pty, &tio) != -1)
303 { 372 }
304 tcflag_t new_cflag = tio.c_iflag;
305
306 if (on)
307 new_cflag |= IUTF8;
308 else
309 new_cflag &= ~IUTF8;
310
311 if (new_cflag != tio.c_iflag)
312 {
313 tio.c_iflag = new_cflag;
314 tcsetattr (pty, TCSANOW, &tio);
315 }
316 }
317#endif 373#endif
318}
319 374
320static struct ttyconf {
321 gid_t gid;
322 mode_t mode;
323
324 ttyconf ()
325 {
326#ifdef TTY_GID_SUPPORT
327 struct group *gr = getgrnam ("tty");
328
329 if (gr)
330 { /* change group ownership of tty to "tty" */
331 mode = S_IRUSR | S_IWUSR | S_IWGRP;
332 gid = gr->gr_gid;
333 }
334 else
335#endif /* TTY_GID_SUPPORT */
336 {
337 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
338 gid = 0;
339 }
340 }
341} ttyconf;
342
343ptytty_unix::ptytty_unix ()
344{
345 name = 0;
346#if UTMP_SUPPORT 375#if UTMP_SUPPORT
347 cmd_pid = 0; 376# if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID)
348#endif 377 int fd_stdin = dup (STDIN_FILENO);
349} 378 dup2 (tty, STDIN_FILENO);
350 379
351ptytty_unix::~ptytty_unix () 380 utmp_pos = ttyslot ();
352{
353#if UTMP_SUPPORT
354 logout ();
355#endif
356 put ();
357}
358 381
359void 382 dup2 (fd_stdin, STDIN_FILENO);
360ptytty_unix::put () 383 close (fd_stdin);
361{
362 if (name)
363 {
364 chmod (name, RESTORE_TTY_MODE);
365 chown (name, 0, ttyconf.gid);
366 }
367
368 close_tty ();
369
370 if (pty >= 0)
371 close (pty);
372
373 free (name);
374
375 pty = tty = -1;
376 name = 0;
377}
378
379bool
380ptytty_unix::get ()
381{
382 /* get master (pty) */
383 if ((pty = get_pty (&tty, &name)) < 0)
384 return false;
385
386 fcntl (pty, F_SETFL, O_NONBLOCK);
387
388 /* get slave (tty) */
389 if (tty < 0)
390 {
391#ifndef NO_SETOWNER_TTYDEV
392 chown (name, getuid (), ttyconf.gid); /* fail silently */
393 chmod (name, ttyconf.mode);
394# ifdef HAVE_REVOKE
395 revoke (name);
396# endif 384# endif
397#endif 385#endif
398 386
399 if ((tty = get_tty (name)) < 0)
400 {
401 put ();
402 return false;
403 }
404 }
405
406 return true; 387 return true;
407} 388}
408 389

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