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Comparing libptytty/src/ptytty.C (file contents):
Revision 1.26 by ayin, Wed Jun 13 17:30:54 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);
… …
104 static int 106 static int
105 get_pty (int *fd_tty, char **ttydev) 107 get_pty (int *fd_tty, char **ttydev)
106 { 108 {
107 int pfd; 109 int pfd;
108 int res; 110 int res;
109 char tty_name[32];
110 111
111 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); 112 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
112 113
113 if (res != -1) 114 if (res != -1)
114 { 115 {
115 *ttydev = strdup (tty_name); 116 *ttydev = strdup (ttyname (*fd_tty));
116 return pfd; 117 return pfd;
117 } 118 }
118 119
119 return -1; 120 return -1;
120 } 121 }
… …
123 124
124 static int 125 static int
125 get_pty (int *fd_tty, char **ttydev) 126 get_pty (int *fd_tty, char **ttydev)
126 { 127 {
127 int pfd; 128 int pfd;
129 char *slave;
128 130
129 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 131 slave = _getpty (&pfd, O_RDWR | O_NOCTTY, 0622, 0);
130 132
131 if (*ttydev != NULL) 133 if (slave != NULL)
132 return pfd;
133
134 return -1;
135 }
136
137#elif defined(HAVE_DEV_PTC)
138
139 static int
140 get_pty (int *fd_tty, char **ttydev)
141 {
142 int pfd;
143
144 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
145 { 134 {
146 *ttydev = strdup (ttyname (pfd));
147 return pfd;
148 }
149
150 return -1;
151 }
152
153#elif defined(HAVE_DEV_CLONE)
154
155 static int
156 get_pty (int *fd_tty, char **ttydev)
157 {
158 int pfd;
159
160 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
161 {
162 *ttydev = strdup (ptsname (pfd)); 135 *ttydev = strdup (slave);
163 return pfd; 136 return pfd;
164 } 137 }
165 138
166 return -1; 139 return -1;
167 } 140 }
… …
179 const char *majors = "pqrstuvwxyzabcde"; 152 const char *majors = "pqrstuvwxyzabcde";
180 const char *minors = "0123456789abcdef"; 153 const char *minors = "0123456789abcdef";
181 154
182 for (i = 0; i < 256; i++) 155 for (i = 0; i < 256; i++)
183 { 156 {
184 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]);
185 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]);
186 159
187 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 160 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
188 { 161 {
189 snprintf(pty_name, 32, "/dev/ptyp%d", i); 162 snprintf (pty_name, 32, "/dev/ptyp%d", i);
190 snprintf(tty_name, 32, "/dev/ttyp%d", i); 163 snprintf (tty_name, 32, "/dev/ttyp%d", i);
191 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 164 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
192 continue; 165 continue;
193 } 166 }
194 167
195 if (access (tty_name, R_OK | W_OK) == 0) 168 if (access (tty_name, R_OK | W_OK) == 0)
… …
221 * Make our tty a controlling tty so that /dev/tty points to us 194 * Make our tty a controlling tty so that /dev/tty points to us
222 */ 195 */
223static int 196static int
224control_tty (int fd_tty) 197control_tty (int fd_tty)
225{ 198{
199 int fd;
200
226 setsid (); 201 setsid ();
227 202
228#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)
229 /* 349 /*
230 * Push STREAMS modules: 350 * Push STREAMS modules:
231 * ptem: pseudo-terminal hardware emulation module. 351 * ptem: pseudo-terminal hardware emulation module.
232 * ldterm: standard terminal line discipline. 352 * ldterm: standard terminal line discipline.
233 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 353 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
234 * 354 *
235 * 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
236 * (i.e. the next section between the dashes giving us "tty opened OK")
237 * should make the "ptem" (or "ldterm" depending upon either which OS 356 * should make the "ptem" (or "ldterm" depending upon either which OS
238 * 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
239 * controlling terminal. We must already have close ()d the master side 358 * controlling terminal. We must already have close ()d the master side
240 * 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
241 * documentation is really unclear about whether it is any close () on 360 * documentation is really unclear about whether it is any close () on
242 * 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
243 * 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
244 * through - Geoff Wing 363 * through - Geoff Wing
245 */ 364 */
246# ifdef HAVE_ISASTREAM 365#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
247 if (isastream (fd_tty) == 1) 366 if (isastream (tty) == 1)
248# endif 367# endif
249 { 368 {
250 ioctl (fd_tty, I_PUSH, "ptem"); 369 ioctl (tty, I_PUSH, "ptem");
251 ioctl (fd_tty, I_PUSH, "ldterm"); 370 ioctl (tty, I_PUSH, "ldterm");
252 ioctl (fd_tty, I_PUSH, "ttcompat"); 371 ioctl (tty, I_PUSH, "ttcompat");
253 }
254#endif
255
256 ioctl (fd_tty, TIOCSCTTY, NULL);
257
258 int fd = open ("/dev/tty", O_WRONLY);
259 if (fd < 0)
260 return -1; /* fatal */
261
262 close (fd);
263
264 return 0;
265}
266
267void
268ptytty::close_tty ()
269{
270 if (tty < 0)
271 return;
272
273 close (tty);
274 tty = -1;
275}
276
277bool
278ptytty::make_controlling_tty ()
279{
280 return control_tty (tty) >= 0;
281}
282
283void
284ptytty::set_utf8_mode (bool on)
285{
286#ifdef IUTF8
287 if (pty < 0)
288 return;
289
290 struct termios tio;
291
292 if (tcgetattr (pty, &tio) != -1)
293 { 372 }
294 tcflag_t new_cflag = tio.c_iflag;
295
296 if (on)
297 new_cflag |= IUTF8;
298 else
299 new_cflag &= ~IUTF8;
300
301 if (new_cflag != tio.c_iflag)
302 {
303 tio.c_iflag = new_cflag;
304 tcsetattr (pty, TCSANOW, &tio);
305 }
306 }
307#endif 373#endif
308}
309 374
310static struct ttyconf {
311 gid_t gid;
312 mode_t mode;
313
314 ttyconf ()
315 {
316#ifdef TTY_GID_SUPPORT
317 struct group *gr = getgrnam ("tty");
318
319 if (gr)
320 { /* change group ownership of tty to "tty" */
321 mode = S_IRUSR | S_IWUSR | S_IWGRP;
322 gid = gr->gr_gid;
323 }
324 else
325#endif /* TTY_GID_SUPPORT */
326 {
327 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
328 gid = 0;
329 }
330 }
331} ttyconf;
332
333ptytty_unix::ptytty_unix ()
334{
335 name = 0;
336#if UTMP_SUPPORT 375#if UTMP_SUPPORT
337 cmd_pid = 0; 376# if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID)
338#endif 377 int fd_stdin = dup (STDIN_FILENO);
339} 378 dup2 (tty, STDIN_FILENO);
340 379
341ptytty_unix::~ptytty_unix () 380 utmp_pos = ttyslot ();
342{
343#if UTMP_SUPPORT
344 logout ();
345#endif
346 put ();
347}
348 381
349void 382 dup2 (fd_stdin, STDIN_FILENO);
350ptytty_unix::put () 383 close (fd_stdin);
351{
352 if (name)
353 {
354 chmod (name, RESTORE_TTY_MODE);
355 chown (name, 0, ttyconf.gid);
356 }
357
358 close_tty ();
359
360 if (pty >= 0)
361 close (pty);
362
363 free (name);
364
365 pty = tty = -1;
366 name = 0;
367}
368
369bool
370ptytty_unix::get ()
371{
372 /* get master (pty) */
373 if ((pty = get_pty (&tty, &name)) < 0)
374 return false;
375
376 fcntl (pty, F_SETFL, O_NONBLOCK);
377
378 /* get slave (tty) */
379 if (tty < 0)
380 {
381#ifndef NO_SETOWNER_TTYDEV
382 chown (name, getuid (), ttyconf.gid); /* fail silently */
383 chmod (name, ttyconf.mode);
384# ifdef HAVE_REVOKE
385 revoke (name);
386# endif 384# endif
387#endif 385#endif
388 386
389 if ((tty = get_tty (name)) < 0)
390 {
391 put ();
392 return false;
393 }
394 }
395
396 return true; 387 return true;
397} 388}
398 389

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