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Comparing libptytty/src/ptytty.C (file contents):
Revision 1.24 by ayin, Sun Sep 10 17:59:21 2006 UTC vs.
Revision 1.41 by sf-exg, Fri Nov 11 15:11:18 2011 UTC

… …
5 * File: ptytty.C 5 * File: ptytty.C
6 *----------------------------------------------------------------------* 6 *----------------------------------------------------------------------*
7 * 7 *
8 * All portions of code are copyright by their respective author/s. 8 * All portions of code are copyright by their respective author/s.
9 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> 9 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
10 * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> 10 * Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de>
11 * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> 11 * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it>
12 * 12 *
13 * This program is free software; you can redistribute it and/or modify 13 * 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 14 * 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 15 * the Free Software Foundation; either version 2 of the License, or
… …
23 * You should have received a copy of the GNU General Public License 23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software 24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 *---------------------------------------------------------------------*/ 26 *---------------------------------------------------------------------*/
27 27
28#include "../config.h" 28#include "config.h"
29 29
30#include "ptytty.h" 30#include "ptytty.h"
31 31
32#include <cstdlib> 32#include <cstdlib>
33#include <cstring> 33#include <cstring>
34#include <csignal> 34#include <csignal>
35 35
36#include <sys/types.h> 36#include <sys/types.h>
37#include <sys/stat.h>
37#include <unistd.h> 38#include <unistd.h>
38#include <fcntl.h> 39#include <fcntl.h>
39 40
40#ifdef HAVE_SYS_IOCTL_H 41#ifdef HAVE_SYS_IOCTL_H
41# include <sys/ioctl.h> 42# include <sys/ioctl.h>
42#endif 43#endif
43#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) 44#if defined(HAVE_SYS_STROPTS_H)
44# include <sys/stropts.h> /* for I_PUSH */ 45# include <sys/stropts.h> /* for I_PUSH */
45#endif 46#endif
46#ifdef HAVE_ISASTREAM 47#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
47# include <stropts.h> 48# include <stropts.h>
48#endif 49#endif
49#if defined(HAVE_PTY_H) 50#if defined(HAVE_PTY_H)
50# include <pty.h> 51# include <pty.h>
51#elif defined(HAVE_LIBUTIL_H) 52#elif defined(HAVE_LIBUTIL_H)
… …
63 64
64/* ------------------------------------------------------------------------- * 65/* ------------------------------------------------------------------------- *
65 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 66 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
66 * ------------------------------------------------------------------------- */ 67 * ------------------------------------------------------------------------- */
67/* 68/*
68 * Returns pty file descriptor, or -1 on failure 69 * Returns pty file descriptor, or -1 on failure
69 * If successful, ttydev is set to the name of the slave device. 70 * If successful, ttydev is set to the name of the slave device.
70 * fd_tty _may_ also be set to an open fd to the slave device 71 * fd_tty _may_ also be set to an open fd to the slave device
71 */ 72 */
72#if defined(UNIX98_PTY) 73#if defined(UNIX98_PTY)
74
73static int 75 static int
74get_pty (int *fd_tty, char **ttydev) 76 get_pty (int *fd_tty, char **ttydev)
75{ 77 {
76 int pfd; 78 int pfd;
77 79
78# if defined(HAVE_GETPT) 80# if defined(HAVE_GETPT)
79 pfd = getpt(); 81 pfd = getpt();
80# elif defined(HAVE_POSIX_OPENPT) 82# elif defined(HAVE_POSIX_OPENPT)
81 pfd = posix_openpt (O_RDWR); 83 pfd = posix_openpt (O_RDWR | O_NOCTTY);
82# else 84# else
85# ifdef _AIX
83 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); 86 pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0);
87# else
88 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
89# endif
84# endif 90# endif
91
85 if (pfd >= 0) 92 if (pfd >= 0)
86 { 93 {
87 if (grantpt (pfd) == 0 /* change slave permissions */ 94 if (grantpt (pfd) == 0 /* change slave permissions */
88 && unlockpt (pfd) == 0) 95 && unlockpt (pfd) == 0)
96 {
89 { /* slave now unlocked */ 97 /* slave now unlocked */
90 *ttydev = strdup (ptsname (pfd)); /* get slave's name */ 98 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
91 return pfd; 99 return pfd;
92 } 100 }
93 101
94 close (pfd); 102 close (pfd);
95 } 103 }
96 104
97 return -1; 105 return -1;
98} 106 }
107
99#elif defined(HAVE_OPENPTY) 108#elif defined(HAVE_OPENPTY)
109
100static int 110 static int
101get_pty (int *fd_tty, char **ttydev) 111 get_pty (int *fd_tty, char **ttydev)
102{ 112 {
103 int pfd; 113 int pfd;
104 int res; 114 int res;
105 char tty_name[32]; 115
106
107 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); 116 res = openpty (&pfd, fd_tty, NULL, NULL, NULL);
117
108 if (res != -1) 118 if (res != -1)
109 { 119 {
110 *ttydev = strdup (tty_name); 120 *ttydev = strdup (ttyname (*fd_tty));
111 return pfd; 121 return pfd;
112 } 122 }
113 123
114 return -1; 124 return -1;
115} 125 }
126
116#elif defined(HAVE__GETPTY) 127#elif defined(HAVE__GETPTY)
128
117static int 129 static int
118get_pty (int *fd_tty, char **ttydev) 130 get_pty (int *fd_tty, char **ttydev)
119{ 131 {
120 int pfd; 132 int pfd;
133 char *slave;
121 134
122 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 135 slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
123 if (*ttydev != NULL)
124 return pfd;
125 136
126 return -1; 137 if (slave != NULL)
127}
128#elif defined(HAVE_DEV_PTC)
129static int
130get_pty (int *fd_tty, char **ttydev)
131{
132 int pfd;
133
134 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
135 { 138 {
136 *ttydev = strdup (ttyname (pfd)); 139 *ttydev = strdup (slave);
137 return pfd; 140 return pfd;
138 } 141 }
139 142
140 return -1; 143 return -1;
141}
142#elif defined(HAVE_DEV_CLONE)
143static int
144get_pty (int *fd_tty, char **ttydev)
145{
146 int pfd;
147
148 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
149 {
150 *ttydev = strdup (ptsname (pfd));
151 return pfd;
152 } 144 }
153 145
154 return -1;
155}
156#else 146#else
147
157/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ 148 /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
158static int 149 static int
159get_pty (int *fd_tty, char **ttydev) 150 get_pty (int *fd_tty, char **ttydev)
160{ 151 {
161 int pfd; 152 int pfd;
162 int i; 153 int i;
163 char pty_name[32]; 154 char pty_name[32];
164 char tty_name[32]; 155 char tty_name[32];
165 const char *majors = "pqrstuvwxyzabcde"; 156 const char *majors = "pqrstuvwxyzabcde";
166 const char *minors = "0123456789abcdef"; 157 const char *minors = "0123456789abcdef";
158
167 for (i = 0; i < 256; i++) 159 for (i = 0; i < 256; i++)
168 { 160 {
169 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); 161 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
170 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); 162 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
163
171 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 164 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
172 { 165 {
173 snprintf(pty_name, 32, "/dev/ptyp%d", i); 166 snprintf(pty_name, 32, "/dev/ptyp%d", i);
174 snprintf(tty_name, 32, "/dev/ttyp%d", i); 167 snprintf(tty_name, 32, "/dev/ttyp%d", i);
175 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) 168 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
176 continue; 169 continue;
177 } 170 }
171
178 if (access (tty_name, R_OK | W_OK) == 0) 172 if (access (tty_name, R_OK | W_OK) == 0)
179 { 173 {
180 *ttydev = strdup (tty_name); 174 *ttydev = strdup (tty_name);
181 return pfd; 175 return pfd;
182 } 176 }
183 177
184 close (pfd); 178 close (pfd);
185 } 179 }
186 180
187 return -1; 181 return -1;
188} 182 }
183
189#endif 184#endif
190 185
191/*----------------------------------------------------------------------*/ 186/*----------------------------------------------------------------------*/
192/* 187/*
193 * Returns tty file descriptor, or -1 on failure 188 * Returns tty file descriptor, or -1 on failure
194 */ 189 */
195static int 190static int
196get_tty (char *ttydev) 191get_tty (char *ttydev)
197{ 192{
198 return open (ttydev, O_RDWR | O_NOCTTY, 0); 193 return open (ttydev, O_RDWR | O_NOCTTY, 0);
… …
203 * Make our tty a controlling tty so that /dev/tty points to us 198 * Make our tty a controlling tty so that /dev/tty points to us
204 */ 199 */
205static int 200static int
206control_tty (int fd_tty) 201control_tty (int fd_tty)
207{ 202{
203 int fd;
204
208 setsid (); 205 setsid ();
209 206
210#if defined(HAVE_DEV_PTMX) && defined(I_PUSH) 207#ifdef TIOCSCTTY
208 ioctl (fd_tty, TIOCSCTTY, NULL);
209#else
210 fd = open (ttyname (fd_tty), O_RDWR);
211 if (fd >= 0)
212 close (fd);
213#endif
214
215 fd = open ("/dev/tty", O_WRONLY);
216 if (fd < 0)
217 return -1; /* fatal */
218
219 close (fd);
220
221 return 0;
222}
223
224void
225ptytty::close_tty ()
226{
227 if (tty < 0)
228 return;
229
230 close (tty);
231 tty = -1;
232}
233
234bool
235ptytty::make_controlling_tty ()
236{
237 return control_tty (tty) >= 0;
238}
239
240void
241ptytty::set_utf8_mode (bool on)
242{
243#ifdef IUTF8
244 if (pty < 0)
245 return;
246
247 struct termios tio;
248
249 if (tcgetattr (pty, &tio) != -1)
250 {
251 tcflag_t new_cflag = tio.c_iflag;
252
253 if (on)
254 new_cflag |= IUTF8;
255 else
256 new_cflag &= ~IUTF8;
257
258 if (new_cflag != tio.c_iflag)
259 {
260 tio.c_iflag = new_cflag;
261 tcsetattr (pty, TCSANOW, &tio);
262 }
263 }
264#endif
265}
266
267static struct ttyconf {
268 gid_t gid;
269 mode_t mode;
270
271 ttyconf ()
272 {
273#ifdef TTY_GID_SUPPORT
274 struct group *gr = getgrnam ("tty");
275
276 if (gr)
277 {
278 /* change group ownership of tty to "tty" */
279 mode = S_IRUSR | S_IWUSR | S_IWGRP;
280 gid = gr->gr_gid;
281 }
282 else
283#endif /* TTY_GID_SUPPORT */
284 {
285 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
286 gid = 0;
287 }
288 }
289} ttyconf;
290
291ptytty_unix::ptytty_unix ()
292{
293 name = 0;
294#if UTMP_SUPPORT
295 cmd_pid = 0;
296#endif
297}
298
299ptytty_unix::~ptytty_unix ()
300{
301#if UTMP_SUPPORT
302 logout ();
303#endif
304 put ();
305}
306
307void
308ptytty_unix::put ()
309{
310 if (name)
311 {
312 chmod (name, RESTORE_TTY_MODE);
313 chown (name, 0, ttyconf.gid);
314 }
315
316 close_tty ();
317
318 if (pty >= 0)
319 close (pty);
320
321 free (name);
322
323 pty = tty = -1;
324 name = 0;
325}
326
327bool
328ptytty_unix::get ()
329{
330 /* get master (pty) */
331 if ((pty = get_pty (&tty, &name)) < 0)
332 return false;
333
334 fcntl (pty, F_SETFL, O_NONBLOCK);
335
336 /* get slave (tty) */
337 if (tty < 0)
338 {
339#ifndef NO_SETOWNER_TTYDEV
340 chown (name, getuid (), ttyconf.gid); /* fail silently */
341 chmod (name, ttyconf.mode);
342# ifdef HAVE_REVOKE
343 revoke (name);
344# endif
345#endif
346
347 if ((tty = get_tty (name)) < 0)
348 {
349 put ();
350 return false;
351 }
352 }
353
354#if defined(I_PUSH)
211 /* 355 /*
212 * Push STREAMS modules: 356 * Push STREAMS modules:
213 * ptem: pseudo-terminal hardware emulation module. 357 * ptem: pseudo-terminal hardware emulation module.
214 * ldterm: standard terminal line discipline. 358 * ldterm: standard terminal line discipline.
215 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 359 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
216 * 360 *
217 * After we push the STREAMS modules, the first open () on the slave side 361 * After we push the STREAMS modules, the first open () on the slave side
218 * (i.e. the next section between the dashes giving us "tty opened OK")
219 * should make the "ptem" (or "ldterm" depending upon either which OS 362 * should make the "ptem" (or "ldterm" depending upon either which OS
220 * version or which set of manual pages you have) module give us a 363 * version or which set of manual pages you have) module give us a
221 * controlling terminal. We must already have close ()d the master side 364 * controlling terminal. We must already have close ()d the master side
222 * fd in this child process before we push STREAMS modules on because the 365 * fd in this child process before we push STREAMS modules on because the
223 * documentation is really unclear about whether it is any close () on 366 * documentation is really unclear about whether it is any close () on
224 * the master side or the last close () - i.e. a proper STREAMS dismantling 367 * the master side or the last close () - i.e. a proper STREAMS dismantling
225 * close () - on the master side which causes a hang up to be sent 368 * close () - on the master side which causes a hang up to be sent
226 * through - Geoff Wing 369 * through - Geoff Wing
227 */ 370 */
228# ifdef HAVE_ISASTREAM 371#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H)
229 if (isastream (fd_tty) == 1) 372 if (isastream (tty) == 1)
230# endif 373# endif
231 { 374 {
232 ioctl (fd_tty, I_PUSH, "ptem"); 375 ioctl (tty, I_PUSH, "ptem");
233 ioctl (fd_tty, I_PUSH, "ldterm"); 376 ioctl (tty, I_PUSH, "ldterm");
234 ioctl (fd_tty, I_PUSH, "ttcompat"); 377 ioctl (tty, I_PUSH, "ttcompat");
235 }
236#endif
237
238 ioctl (fd_tty, TIOCSCTTY, NULL);
239
240 int fd = open ("/dev/tty", O_WRONLY);
241 if (fd < 0)
242 return -1; /* fatal */
243
244 close (fd);
245
246 return 0;
247}
248
249void
250ptytty::close_tty ()
251{
252 if (tty < 0)
253 return;
254
255 close (tty);
256 tty = -1;
257}
258
259bool
260ptytty::make_controlling_tty ()
261{
262 return control_tty (tty) >= 0;
263}
264
265void
266ptytty::set_utf8_mode (bool on)
267{
268#ifdef IUTF8
269 if (pty < 0)
270 return;
271
272 struct termios tio;
273
274 if (tcgetattr (pty, &tio) != -1)
275 { 378 }
276 tcflag_t new_cflag = tio.c_iflag;
277
278 if (on)
279 new_cflag |= IUTF8;
280 else
281 new_cflag &= ~IUTF8;
282
283 if (new_cflag != tio.c_iflag)
284 {
285 tio.c_iflag = new_cflag;
286 tcsetattr (pty, TCSANOW, &tio);
287 }
288 }
289#endif
290}
291
292static struct ttyconf {
293 gid_t gid;
294 mode_t mode;
295
296 ttyconf ()
297 {
298#ifdef TTY_GID_SUPPORT
299 struct group *gr = getgrnam ("tty");
300
301 if (gr)
302 { /* change group ownership of tty to "tty" */
303 mode = S_IRUSR | S_IWUSR | S_IWGRP;
304 gid = gr->gr_gid;
305 }
306 else
307#endif /* TTY_GID_SUPPORT */
308 {
309 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
310 gid = 0;
311 }
312 }
313} ttyconf;
314
315ptytty_unix::ptytty_unix ()
316{
317 name = 0;
318#if UTMP_SUPPORT
319 cmd_pid = 0;
320#endif
321}
322
323ptytty_unix::~ptytty_unix ()
324{
325#if UTMP_SUPPORT
326 logout ();
327#endif
328 put ();
329}
330
331void
332ptytty_unix::put ()
333{
334 chmod (name, RESTORE_TTY_MODE);
335 chown (name, 0, ttyconf.gid);
336
337 close_tty ();
338
339 if (pty >= 0)
340 close (pty);
341
342 free (name);
343
344 pty = tty = -1;
345 name = 0;
346}
347
348bool
349ptytty_unix::get ()
350{
351 /* get master (pty) */
352 if ((pty = get_pty (&tty, &name)) < 0)
353 return false;
354
355 fcntl (pty, F_SETFL, O_NONBLOCK);
356
357 /* get slave (tty) */
358 if (tty < 0)
359 {
360#ifndef NO_SETOWNER_TTYDEV
361 chown (name, getuid (), ttyconf.gid); /* fail silently */
362 chmod (name, ttyconf.mode);
363# ifdef HAVE_REVOKE
364 revoke (name);
365# endif 379#endif
366#endif
367
368 if ((tty = get_tty (name)) < 0)
369 {
370 put ();
371 return false;
372 }
373 }
374 380
375 return true; 381 return true;
376} 382}
377 383

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