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Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.3 by pcg, Tue Nov 25 15:25:17 2003 UTC vs.
Revision 1.39 by root, Tue Jan 17 12:22:59 2006 UTC

1/*--------------------------------*-C-*---------------------------------* 1/*--------------------------------*-C-*---------------------------------*
2 * File: ptytty.c 2 * File: ptytty.C
3 *----------------------------------------------------------------------* 3 *----------------------------------------------------------------------*
4 * $Id: ptytty.C,v 1.3 2003/11/25 15:25:17 pcg Exp $
5 * 4 *
6 * All portions of code are copyright by their respective author/s. 5 * All portions of code are copyright by their respective author/s.
7 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> 6 * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com>
7 * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com>
8 * 8 *
9 * This program is free software; you can redistribute it and/or modify 9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by 10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or 11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version. 12 * (at your option) any later version.
… …
20 * along with this program; if not, write to the Free Software 20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *---------------------------------------------------------------------*/ 22 *---------------------------------------------------------------------*/
23 23
24#include "../config.h" /* NECESSARY */ 24#include "../config.h" /* NECESSARY */
25#include "rxvt.h"
25 26
26/*
27 * Try to be self-contained except for the above autoconfig'd defines
28 */
29
30#include <stdio.h>
31#ifdef HAVE_STDLIB_H
32# include <stdlib.h> 27# include <cstdlib>
33#endif 28# include <cstring>
29
34#ifdef HAVE_SYS_TYPES_H 30#ifdef HAVE_SYS_TYPES_H
35# include <sys/types.h> 31# include <sys/types.h>
36#endif 32#endif
37#ifdef HAVE_UNISTD_H 33#ifdef HAVE_UNISTD_H
38# include <unistd.h> 34# include <unistd.h>
39#endif 35#endif
40#if defined(HAVE_STRING_H)
41# include <string.h>
42#endif
43#ifdef HAVE_FCNTL_H 36#ifdef HAVE_FCNTL_H
44# include <fcntl.h> 37# include <fcntl.h>
45#endif 38#endif
46#ifdef HAVE_SYS_IOCTL_H 39#ifdef HAVE_SYS_IOCTL_H
47# include <sys/ioctl.h> 40# include <sys/ioctl.h>
48#endif 41#endif
49#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__) 42#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H)
50# include <sys/stropts.h> /* for I_PUSH */ 43# include <sys/stropts.h> /* for I_PUSH */
51#endif 44#endif
52 45#ifdef HAVE_ISASTREAM
53 46# include <stropts.h>
54#ifdef DEBUG_TTY
55# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr)
56#else
57# define D_TTY(x)
58#endif 47#endif
48#if defined(HAVE_PTY_H)
49# include <pty.h>
50#elif defined(HAVE_LIBUTIL_H)
51# include <libutil.h>
52#elif defined(HAVE_UTIL_H)
53# include <util.h>
54#endif
55
56#include <cstdio>
57#include <grp.h>
58
59#include "ptytty.h"
60
61/////////////////////////////////////////////////////////////////////////////
59 62
60/* ------------------------------------------------------------------------- * 63/* ------------------------------------------------------------------------- *
61 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 64 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
62 * ------------------------------------------------------------------------- */ 65 * ------------------------------------------------------------------------- */
63/* 66/*
64 * Returns pty file descriptor, or -1 on failure 67 * Returns pty file descriptor, or -1 on failure
65 * If successful, ttydev is set to the name of the slave device. 68 * If successful, ttydev is set to the name of the slave device.
66 * fd_tty _may_ also be set to an open fd to the slave device 69 * fd_tty _may_ also be set to an open fd to the slave device
67 */ 70 */
68/* EXTPROTO */ 71static int
69int
70rxvt_get_pty(int *fd_tty, const char **ttydev) 72get_pty (int *fd_tty, char **ttydev)
71{ 73{
72 int pfd; 74 int pfd;
73 75
74#ifdef PTYS_ARE_OPENPTY 76#ifdef PTYS_ARE_OPENPTY
75 char tty_name[sizeof "/dev/pts/????\0"]; 77 char tty_name[sizeof "/dev/pts/????\0"];
76 78
79 rxvt_privileges(RESTORE);
77 if (openpty(&pfd, fd_tty, tty_name, NULL, NULL) != -1) { 80 int res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
81 rxvt_privileges(IGNORE);
82
83 if (res != -1)
84 {
78 *ttydev = strdup(tty_name); 85 *ttydev = strdup (tty_name);
79 return pfd; 86 return pfd;
80 } 87 }
81#endif 88#endif
82 89
83#ifdef PTYS_ARE__GETPTY 90#ifdef PTYS_ARE__GETPTY
84 *ttydev = _getpty(&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 91 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
85 if (*ttydev != NULL) 92 if (*ttydev != NULL)
86 return pfd;
87#endif
88
89#ifdef PTYS_ARE_GETPTY
90 char *ptydev;
91
92 while ((ptydev = getpty()) != NULL)
93 if ((pfd = open(ptydev, O_RDWR | O_NOCTTY, 0)) >= 0) {
94 *ttydev = ptydev;
95 return pfd; 93 return pfd;
96 }
97#endif 94#endif
98 95
99#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) 96#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
100# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX) 97# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_POSIX) || defined(PTYS_ARE_PTMX)
98
101 { 99 {
102# ifdef PTYS_ARE_GETPT 100# ifdef PTYS_ARE_GETPT
103 pfd = getpt(); 101 pfd = getpt();
104# else 102# else
103# ifdef PTYS_ARE_POSIX
104 pfd = posix_openpt (O_RDWR);
105# else
105 pfd = open("/dev/ptmx", O_RDWR | O_NOCTTY, 0); 106 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
106# endif 107# endif
108# endif
109
107 if (pfd >= 0) { 110 if (pfd >= 0)
111 {
108 if (grantpt(pfd) == 0 /* change slave permissions */ 112 if (grantpt (pfd) == 0 /* change slave permissions */
109 && unlockpt(pfd) == 0) { /* slave now unlocked */ 113 && unlockpt (pfd) == 0)
114 { /* slave now unlocked */
110 *ttydev = ptsname(pfd); /* get slave's name */ 115 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
111 return pfd; 116 return pfd;
112 } 117 }
113 close(pfd); 118 close (pfd);
114 }
115 } 119 }
120 }
116# endif 121# endif
117#endif 122#endif
118 123
119#ifdef PTYS_ARE_PTC 124#ifdef PTYS_ARE_PTC
120 if ((pfd = open("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) { 125 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
121 *ttydev = ttyname(pfd); 126 {
127 *ttydev = strdup (ttyname (pfd));
122 return pfd; 128 return pfd;
123 } 129 }
124#endif 130#endif
125 131
126#ifdef PTYS_ARE_CLONE 132#ifdef PTYS_ARE_CLONE
127 if ((pfd = open("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) { 133 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
128 *ttydev = ptsname(pfd); 134 {
135 *ttydev = strdup (ptsname (pfd));
129 return pfd; 136 return pfd;
130 } 137 }
131#endif 138#endif
132 139
133#ifdef PTYS_ARE_NUMERIC 140#ifdef PTYS_ARE_NUMERIC
134 { 141 {
135 int idx; 142 int idx;
136 char *c1, *c2; 143 char *c1, *c2;
137 char pty_name[] = "/dev/ptyp???"; 144 char pty_name[] = "/dev/ptyp???";
138 char tty_name[] = "/dev/ttyp???"; 145 char tty_name[] = "/dev/ttyp???";
139 146
140 c1 = &(pty_name[sizeof(pty_name) - 4]); 147 c1 = &(pty_name[sizeof (pty_name) - 4]);
141 c2 = &(tty_name[sizeof(tty_name) - 4]); 148 c2 = &(tty_name[sizeof (tty_name) - 4]);
142 for (idx = 0; idx < 256; idx++) { 149 for (idx = 0; idx < 256; idx++)
150 {
143 sprintf(c1, "%d", idx); 151 sprintf (c1, "%d", idx);
144 sprintf(c2, "%d", idx); 152 sprintf (c2, "%d", idx);
145 if (access(tty_name, F_OK) < 0) { 153 if (access (tty_name, F_OK) < 0)
146 idx = 256; 154 {
147 break; 155 idx = 256;
148 } 156 break;
157 }
158
149 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) { 159 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
160 {
150 if (access(tty_name, R_OK | W_OK) == 0) { 161 if (access (tty_name, R_OK | W_OK) == 0)
162 {
151 *ttydev = strdup(tty_name); 163 *ttydev = strdup (tty_name);
152 return pfd; 164 return pfd;
153 } 165 }
154 close(pfd); 166
155 } 167 close (pfd);
156 } 168 }
157 } 169 }
170 }
158#endif 171#endif
172
159#ifdef PTYS_ARE_SEARCHED 173#ifdef PTYS_ARE_SEARCHED
160 { 174 {
161 const char *c1, *c2; 175 const char *c1, *c2;
162 char pty_name[] = "/dev/pty??"; 176 char pty_name[] = "/dev/pty??";
163 char tty_name[] = "/dev/tty??"; 177 char tty_name[] = "/dev/tty??";
164 178
165# ifndef PTYCHAR1 179# ifndef PTYCHAR1
166# define PTYCHAR1 "pqrstuvwxyz" 180# define PTYCHAR1 "pqrstuvwxyz"
167# endif 181# endif
168# ifndef PTYCHAR2 182# ifndef PTYCHAR2
169# define PTYCHAR2 "0123456789abcdef" 183# define PTYCHAR2 "0123456789abcdef"
170# endif 184# endif
185
171 for (c1 = PTYCHAR1; *c1; c1++) { 186 for (c1 = PTYCHAR1; *c1; c1++)
187 {
172 pty_name[(sizeof(pty_name) - 3)] = 188 pty_name[ (sizeof (pty_name) - 3)] =
173 tty_name[(sizeof(pty_name) - 3)] = *c1; 189 tty_name[ (sizeof (pty_name) - 3)] = *c1;
174 for (c2 = PTYCHAR2; *c2; c2++) { 190 for (c2 = PTYCHAR2; *c2; c2++)
191 {
175 pty_name[(sizeof(pty_name) - 2)] = 192 pty_name[ (sizeof (pty_name) - 2)] =
176 tty_name[(sizeof(pty_name) - 2)] = *c2; 193 tty_name[ (sizeof (pty_name) - 2)] = *c2;
177 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) { 194 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
195 {
178 if (access(tty_name, R_OK | W_OK) == 0) { 196 if (access (tty_name, R_OK | W_OK) == 0)
179 *ttydev = strdup(tty_name); 197 {
180 return pfd; 198 *ttydev = strdup (tty_name);
181 } 199 return pfd;
182 close(pfd); 200 }
183 } 201
184 } 202 close (pfd);
185 } 203 }
204 }
186 } 205 }
206 }
187#endif 207#endif
208
188 return -1; 209 return -1;
189} 210}
190 211
191/*----------------------------------------------------------------------*/ 212/*----------------------------------------------------------------------*/
192/* 213/*
193 * Returns tty file descriptor, or -1 on failure 214 * Returns tty file descriptor, or -1 on failure
194 */ 215 */
195/* EXTPROTO */ 216static int
196int
197rxvt_get_tty(const char *ttydev) 217get_tty (char *ttydev)
198{ 218{
199 return open(ttydev, O_RDWR | O_NOCTTY, 0); 219 return open (ttydev, O_RDWR | O_NOCTTY, 0);
200} 220}
201 221
202/*----------------------------------------------------------------------*/ 222/*----------------------------------------------------------------------*/
203/* 223/*
204 * Make our tty a controlling tty so that /dev/tty points to us 224 * Make our tty a controlling tty so that /dev/tty points to us
205 */ 225 */
206/* EXTPROTO */ 226static int
207int 227control_tty (int fd_tty)
208rxvt_control_tty(int fd_tty, const char *ttydev)
209{ 228{
210#ifndef __QNX__ 229 int fd;
211 int fd;
212 230
213 D_TTY((stderr, "rxvt_control_tty(): pid: %d, tty fd: %d, dev: %s", getpid(), fd_tty, ttydev));
214/* ---------------------------------------- */ 231 /* ---------------------------------------- */
215# ifdef HAVE_SETSID
216 setsid(); 232 setsid ();
217# endif 233
218# if defined(HAVE_SETPGID)
219 setpgid(0, 0);
220# elif defined(HAVE_SETPGRP)
221 setpgrp(0, 0);
222# endif
223/* ---------------------------------------- */ 234 /* ---------------------------------------- */
224# ifdef TIOCNOTTY
225 fd = open("/dev/tty", O_RDWR | O_NOCTTY);
226 D_TTY((stderr, "rxvt_control_tty(): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
227 if (fd >= 0) {
228 ioctl(fd, TIOCNOTTY, NULL); /* void tty associations */
229 close(fd);
230 }
231# endif
232/* ---------------------------------------- */
233 fd = open("/dev/tty", O_RDWR | O_NOCTTY);
234 D_TTY((stderr, "rxvt_control_tty(): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
235 if (fd >= 0)
236 close(fd); /* ouch: still have controlling tty */
237/* ---------------------------------------- */
238#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) 235# if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
239/* 236 /*
240 * Push STREAMS modules: 237 * Push STREAMS modules:
241 * ptem: pseudo-terminal hardware emulation module. 238 * ptem: pseudo-terminal hardware emulation module.
242 * ldterm: standard terminal line discipline. 239 * ldterm: standard terminal line discipline.
243 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 240 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
244 * 241 *
245 * After we push the STREAMS modules, the first open() on the slave side 242 * After we push the STREAMS modules, the first open () on the slave side
246 * (i.e. the next section between the dashes giving us "tty opened OK") 243 * (i.e. the next section between the dashes giving us "tty opened OK")
247 * should make the "ptem" (or "ldterm" depending upon either which OS 244 * should make the "ptem" (or "ldterm" depending upon either which OS
248 * version or which set of manual pages you have) module give us a 245 * version or which set of manual pages you have) module give us a
249 * controlling terminal. We must already have close()d the master side 246 * controlling terminal. We must already have close ()d the master side
250 * fd in this child process before we push STREAMS modules on because the 247 * fd in this child process before we push STREAMS modules on because the
251 * documentation is really unclear about whether it is any close() on 248 * documentation is really unclear about whether it is any close () on
252 * the master side or the last close() - i.e. a proper STREAMS dismantling 249 * the master side or the last close () - i.e. a proper STREAMS dismantling
253 * close() - on the master side which causes a hang up to be sent 250 * close () - on the master side which causes a hang up to be sent
254 * through - Geoff Wing 251 * through - Geoff Wing
255 */ 252 */
256# ifdef HAVE_ISASTREAM 253# ifdef HAVE_ISASTREAM
257 if (isastream(fd_tty) == 1) 254 if (isastream (fd_tty) == 1)
258# endif 255# endif
259 { 256 {
260 D_TTY((stderr, "rxvt_control_tty(): Pushing STREAMS modules"));
261 ioctl(fd_tty, I_PUSH, "ptem"); 257 ioctl (fd_tty, I_PUSH, "ptem");
262 ioctl(fd_tty, I_PUSH, "ldterm"); 258 ioctl (fd_tty, I_PUSH, "ldterm");
263 ioctl(fd_tty, I_PUSH, "ttcompat"); 259 ioctl (fd_tty, I_PUSH, "ttcompat");
264 } 260 }
265#endif 261# endif
266/* ---------------------------------------- */ 262 /* ---------------------------------------- */
267# if defined(TIOCSCTTY)
268 fd = ioctl(fd_tty, TIOCSCTTY, NULL); 263 fd = ioctl (fd_tty, TIOCSCTTY, NULL);
269 D_TTY((stderr, "rxvt_control_tty(): ioctl(..,TIOCSCTTY): %d", fd)); 264 /* ---------------------------------------- */
270# elif defined(TIOCSETCTTY) 265 fd = open ("/dev/tty", O_WRONLY);
271 fd = ioctl(fd_tty, TIOCSETCTTY, NULL); 266 if (fd < 0)
272 D_TTY((stderr, "rxvt_control_tty(): ioctl(..,TIOCSETCTTY): %d", fd)); 267 return -1; /* fatal */
268 close (fd);
269 /* ---------------------------------------- */
270
271 return 0;
272}
273
274void
275rxvt_ptytty::close_tty ()
276{
277 if (tty < 0)
278 return;
279
280 close (tty);
281 tty = -1;
282}
283
284bool
285rxvt_ptytty::make_controlling_tty ()
286{
287 return control_tty (tty) >= 0;
288}
289
290void
291rxvt_ptytty::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 {
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
315}
316
317/////////////////////////////////////////////////////////////////////////////
318
319#ifndef NO_SETOWNER_TTYDEV
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 = getgid ();
339 }
340 }
341} ttyconf;
342
343/////////////////////////////////////////////////////////////////////////////
344
345void
346rxvt_ptytty_unix::privileges (rxvt_privaction action)
347{
348 if (!name || !*name)
349 return;
350
351 rxvt_privileges (RESTORE);
352
353 if (action == SAVE)
354 {
355# ifndef RESET_TTY_TO_COMMON_DEFAULTS
356 /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
357 if (lstat (name, &savestat) < 0) /* you lose out */
358 ;
359 else
360# endif
361 {
362 saved = true;
363 chown (name, getuid (), ttyconf.gid); /* fail silently */
364 chmod (name, ttyconf.mode);
365# ifdef HAVE_REVOKE
366 revoke (name);
367# endif
368 }
369 }
370 else
371 { /* action == RESTORE */
372# ifndef RESET_TTY_TO_COMMON_DEFAULTS
373 if (saved)
374 {
375 chmod (name, savestat.st_mode);
376 chown (name, savestat.st_uid, savestat.st_gid);
377 }
273# else 378# else
274 fd = open(ttydev, O_RDWR); 379 chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH));
275 D_TTY((stderr, "rxvt_control_tty(): tty open%s", fd < 0 ? " failure" : "ed OK")); 380 chown (name, 0, 0);
276 if (fd >= 0) 381# endif
277 close(fd); 382
383 }
384
385 rxvt_privileges (IGNORE);
386}
278# endif 387#endif
279/* ---------------------------------------- */ 388
280 fd = open("/dev/tty", O_WRONLY); 389rxvt_ptytty_unix::rxvt_ptytty_unix ()
281 D_TTY((stderr, "rxvt_control_tty(): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)")); 390{
282 if (fd < 0) 391 pty = tty = -1;
283 return -1; /* fatal */ 392 name = 0;
284 close(fd); 393#ifndef NO_SETOWNER_TTYDEV
285/* ---------------------------------------- */ 394 saved = false;
286 D_TTY((stderr, "rxvt_control_tty(): tcgetpgrp(): %d getpgrp(): %d", tcgetpgrp(fd_tty), getpgrp())); 395#endif
287/* ---------------------------------------- */ 396#if UTMP_SUPPORT
288#endif /* ! __QNX__ */ 397 cmd_pid = 0;
398#endif
399}
400
401rxvt_ptytty_unix::~rxvt_ptytty_unix ()
402{
403 logout ();
404 put ();
405}
406
407void
408rxvt_ptytty_unix::put ()
409{
410#ifndef NO_SETOWNER_TTYDEV
411 privileges (RESTORE);
412#endif
413
414 if (pty >= 0) close (pty);
415 close_tty ();
416 free (name);
417
418 pty = tty = -1;
419 name = 0;
420}
421
422bool
423rxvt_ptytty_unix::get ()
424{
425 /* get master (pty) */
426 if ((pty = get_pty (&tty, &name)) < 0)
289 return 0; 427 return false;
428
429 fcntl (pty, F_SETFL, O_NONBLOCK);
430
431 /* get slave (tty) */
432 if (tty < 0)
433 {
434#ifndef NO_SETOWNER_TTYDEV
435 privileges (SAVE);
436#endif
437
438 if ((tty = get_tty (name)) < 0)
439 {
440 put ();
441 return false;
442 }
443 }
444
445 return true;
290} 446}
447
448// a "factory" *g*
449rxvt_ptytty *rxvt_new_ptytty ()
450{
451 return new rxvt_ptytty_unix;
452}
453
291/*----------------------- end-of-file (C source) -----------------------*/ 454/*----------------------- end-of-file (C source) -----------------------*/
455

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