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Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.1 by pcg, Mon Nov 24 17:28:08 2003 UTC vs.
Revision 1.57 by root, Sun Jan 22 12:21:47 2006 UTC

1// This file is part of libptytty. Do not make local modifications.
2// http://software.schmorp.de/pkg/libptytty
3
1/*--------------------------------*-C-*---------------------------------* 4/*----------------------------------------------------------------------*
2 * File: ptytty.c 5 * File: ptytty.C
3 *----------------------------------------------------------------------* 6 *----------------------------------------------------------------------*
4 * $Id: ptytty.C,v 1.1 2003/11/24 17:28:08 pcg Exp $
5 * 7 *
6 * All portions of code are copyright by their respective author/s. 8 * All portions of code are copyright by their respective author/s.
7 * 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>
11 * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it>
8 * 12 *
9 * 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
10 * 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
11 * the Free Software Foundation; either version 2 of the License, or 15 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version. 16 * (at your option) any later version.
… …
19 * 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
20 * along with this program; if not, write to the Free Software 24 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *---------------------------------------------------------------------*/ 26 *---------------------------------------------------------------------*/
23 27
24#include "../config.h" /* NECESSARY */ 28#include "../config.h"
25 29
26/* 30#include "ptytty.h"
27 * Try to be self-contained except for the above autoconfig'd defines
28 */
29 31
30#include <stdio.h>
31#ifdef HAVE_STDLIB_H
32# include <stdlib.h> 32#include <cstdlib>
33#endif 33#include <cstring>
34#ifdef HAVE_SYS_TYPES_H 34
35# include <sys/types.h> 35#include <sys/types.h>
36#endif 36#include <sys/socket.h>
37#ifdef HAVE_UNISTD_H
38# include <unistd.h> 37#include <unistd.h>
39#endif
40#if defined(HAVE_STRING_H)
41# include <string.h>
42#endif
43#ifdef HAVE_FCNTL_H
44# include <fcntl.h> 38#include <fcntl.h>
45#endif 39
46#ifdef HAVE_SYS_IOCTL_H 40#ifdef HAVE_SYS_IOCTL_H
47# include <sys/ioctl.h> 41# include <sys/ioctl.h>
48#endif 42#endif
49#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__) 43#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
50# include <sys/stropts.h> /* for I_PUSH */ 44# include <sys/stropts.h> /* for I_PUSH */
51#endif 45#endif
52 46#ifdef HAVE_ISASTREAM
53 47# 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 48#endif
49#if defined(HAVE_PTY_H)
50# include <pty.h>
51#elif defined(HAVE_LIBUTIL_H)
52# include <libutil.h>
53#elif defined(HAVE_UTIL_H)
54# include <util.h>
55#endif
56#ifdef TTY_GID_SUPPORT
57#include <grp.h>
58#endif
59
60#include <cstdio>
61
62/////////////////////////////////////////////////////////////////////////////
59 63
60/* ------------------------------------------------------------------------- * 64/* ------------------------------------------------------------------------- *
61 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 65 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
62 * ------------------------------------------------------------------------- */ 66 * ------------------------------------------------------------------------- */
63/* 67/*
64 * Returns pty file descriptor, or -1 on failure 68 * Returns pty file descriptor, or -1 on failure
65 * If successful, ttydev is set to the name of the slave device. 69 * 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 70 * fd_tty _may_ also be set to an open fd to the slave device
67 */ 71 */
68/* EXTPROTO */ 72#if defined(UNIX98_PTY)
69int 73static int
70rxvt_get_pty(int *fd_tty, const char **ttydev) 74get_pty (int *fd_tty, char **ttydev)
71{ 75{
72 int pfd; 76 int pfd;
73 77
74#ifdef PTYS_ARE_OPENPTY 78# if defined(HAVE_GETPT)
75 char tty_name[sizeof "/dev/pts/????\0"];
76
77 if (openpty(&pfd, fd_tty, tty_name, NULL, NULL) != -1) {
78 *ttydev = strdup(tty_name);
79 return pfd;
80 }
81#endif
82
83#ifdef PTYS_ARE__GETPTY
84 *ttydev = _getpty(&pfd, O_RDWR | O_NDELAY | O_NOCTTY, 0622, 0);
85 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;
96 }
97#endif
98
99#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
100# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX)
101 {
102# ifdef PTYS_ARE_GETPT
103 pfd = getpt(); 79 pfd = getpt();
80# elif defined(HAVE_POSIX_OPENPT)
81 pfd = posix_openpt (O_RDWR);
104# else 82# else
105 pfd = open("/dev/ptmx", O_RDWR | O_NOCTTY, 0); 83 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0);
106# endif
107 if (pfd >= 0) {
108 if (grantpt(pfd) == 0 /* change slave permissions */
109 && unlockpt(pfd) == 0) { /* slave now unlocked */
110 *ttydev = ptsname(pfd); /* get slave's name */
111 return pfd;
112 }
113 close(pfd);
114 }
115 }
116# endif 84# endif
117#endif 85 if (pfd >= 0)
86 {
87 if (grantpt (pfd) == 0 /* change slave permissions */
88 && unlockpt (pfd) == 0)
89 { /* slave now unlocked */
90 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
91 return pfd;
92 }
118 93
119#ifdef PTYS_ARE_PTC 94 close (pfd);
95 }
96
97 return -1;
98}
99#elif defined(HAVE_OPENPTY)
100static int
101get_pty (int *fd_tty, char **ttydev)
102{
103 int pfd;
104 int res;
105 char tty_name[32];
106
107 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
108 if (res != -1)
109 {
110 *ttydev = strdup (tty_name);
111 return pfd;
112 }
113
114 return -1;
115}
116#elif defined(HAVE__GETPTY)
117static int
118get_pty (int *fd_tty, char **ttydev)
119{
120 int pfd;
121
122 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
123 if (*ttydev != NULL)
124 return pfd;
125
126 return -1;
127}
128#elif defined(HAVE_DEV_PTC)
129static int
130get_pty (int *fd_tty, char **ttydev)
131{
132 int pfd;
133
120 if ((pfd = open("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) { 134 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
121 *ttydev = ttyname(pfd);
122 return pfd;
123 } 135 {
124#endif 136 *ttydev = strdup (ttyname (pfd));
137 return pfd;
138 }
125 139
126#ifdef PTYS_ARE_CLONE 140 return -1;
141}
142#elif defined(HAVE_DEV_CLONE)
143static int
144get_pty (int *fd_tty, char **ttydev)
145{
146 int pfd;
147
127 if ((pfd = open("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) { 148 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
128 *ttydev = ptsname(pfd);
129 return pfd;
130 } 149 {
131#endif 150 *ttydev = strdup (ptsname (pfd));
132 151 return pfd;
133#ifdef PTYS_ARE_NUMERIC
134 {
135 int idx;
136 char *c1, *c2;
137 char pty_name[] = "/dev/ptyp???";
138 char tty_name[] = "/dev/ttyp???";
139
140 c1 = &(pty_name[sizeof(pty_name) - 4]);
141 c2 = &(tty_name[sizeof(tty_name) - 4]);
142 for (idx = 0; idx < 256; idx++) {
143 sprintf(c1, "%d", idx);
144 sprintf(c2, "%d", idx);
145 if (access(tty_name, F_OK) < 0) {
146 idx = 256;
147 break;
148 } 152 }
153
154 return -1;
155}
156#else
157/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
158static int
159get_pty (int *fd_tty, char **ttydev)
160{
161 int pfd;
162 int i;
163 char pty_name[32];
164 char tty_name[32];
165 const char *majors = "pqrstuvwxyzabcde";
166 const char *minors = "0123456789abcdef";
167 for (i = 0; i < 256; i++)
168 {
169 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]);
171 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
172 {
173 snprintf(pty_name, 32, "/dev/ptyp%d", i);
174 snprintf(tty_name, 32, "/dev/ttyp%d", i);
149 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) { 175 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
176 continue;
177 }
150 if (access(tty_name, R_OK | W_OK) == 0) { 178 if (access (tty_name, R_OK | W_OK) == 0)
179 {
151 *ttydev = strdup(tty_name); 180 *ttydev = strdup (tty_name);
152 return pfd; 181 return pfd;
153 } 182 }
154 close(pfd); 183
184 close (pfd);
155 } 185 }
156 } 186}
157 }
158#endif
159#ifdef PTYS_ARE_SEARCHED
160 {
161 const char *c1, *c2;
162 char pty_name[] = "/dev/pty??";
163 char tty_name[] = "/dev/tty??";
164
165# ifndef PTYCHAR1
166# define PTYCHAR1 "pqrstuvwxyz"
167# endif 187#endif
168# ifndef PTYCHAR2
169# define PTYCHAR2 "0123456789abcdef"
170# endif
171 for (c1 = PTYCHAR1; *c1; c1++) {
172 pty_name[(sizeof(pty_name) - 3)] =
173 tty_name[(sizeof(pty_name) - 3)] = *c1;
174 for (c2 = PTYCHAR2; *c2; c2++) {
175 pty_name[(sizeof(pty_name) - 2)] =
176 tty_name[(sizeof(pty_name) - 2)] = *c2;
177 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) {
178 if (access(tty_name, R_OK | W_OK) == 0) {
179 *ttydev = strdup(tty_name);
180 return pfd;
181 }
182 close(pfd);
183 }
184 }
185 }
186 }
187#endif
188 return -1;
189}
190 188
191/*----------------------------------------------------------------------*/ 189/*----------------------------------------------------------------------*/
192/* 190/*
193 * Returns tty file descriptor, or -1 on failure 191 * Returns tty file descriptor, or -1 on failure
194 */ 192 */
195/* EXTPROTO */ 193static int
196int
197rxvt_get_tty(const char *ttydev) 194get_tty (char *ttydev)
198{ 195{
199 return open(ttydev, O_RDWR | O_NOCTTY, 0); 196 return open (ttydev, O_RDWR | O_NOCTTY, 0);
200} 197}
201 198
202/*----------------------------------------------------------------------*/ 199/*----------------------------------------------------------------------*/
203/* 200/*
204 * Make our tty a controlling tty so that /dev/tty points to us 201 * Make our tty a controlling tty so that /dev/tty points to us
205 */ 202 */
206/* EXTPROTO */ 203static int
207int 204control_tty (int fd_tty)
208rxvt_control_tty(int fd_tty, const char *ttydev)
209{ 205{
210#ifndef __QNX__
211 int fd;
212
213 D_TTY((stderr, "rxvt_control_tty(): pid: %d, tty fd: %d, dev: %s", getpid(), fd_tty, ttydev));
214/* ---------------------------------------- */
215# ifdef HAVE_SETSID
216 setsid(); 206 setsid ();
207
208#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
209 /*
210 * Push STREAMS modules:
211 * ptem: pseudo-terminal hardware emulation module.
212 * ldterm: standard terminal line discipline.
213 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
214 *
215 * After we push the STREAMS modules, the first open () on the slave side
216 * (i.e. the next section between the dashes giving us "tty opened OK")
217 * should make the "ptem" (or "ldterm" depending upon either which OS
218 * version or which set of manual pages you have) module give us a
219 * controlling terminal. We must already have close ()d the master side
220 * fd in this child process before we push STREAMS modules on because the
221 * documentation is really unclear about whether it is any close () on
222 * the master side or the last close () - i.e. a proper STREAMS dismantling
223 * close () - on the master side which causes a hang up to be sent
224 * through - Geoff Wing
225 */
226# ifdef HAVE_ISASTREAM
227 if (isastream (fd_tty) == 1)
217# endif 228# endif
218# if defined(HAVE_SETPGID) 229 {
219 setpgid(0, 0); 230 ioctl (fd_tty, I_PUSH, "ptem");
220# elif defined(HAVE_SETPGRP) 231 ioctl (fd_tty, I_PUSH, "ldterm");
221 setpgrp(0, 0); 232 ioctl (fd_tty, I_PUSH, "ttcompat");
233 }
234#endif
235
236 ioctl (fd_tty, TIOCSCTTY, NULL);
237
238 int fd = open ("/dev/tty", O_WRONLY);
239 if (fd < 0)
240 return -1; /* fatal */
241
242 close (fd);
243
244 return 0;
245}
246
247void
248ptytty::close_tty ()
249{
250 if (tty < 0)
251 return;
252
253 close (tty);
254 tty = -1;
255}
256
257bool
258ptytty::make_controlling_tty ()
259{
260 return control_tty (tty) >= 0;
261}
262
263void
264ptytty::set_utf8_mode (bool on)
265{
266#ifdef IUTF8
267 if (pty < 0)
268 return;
269
270 struct termios tio;
271
272 if (tcgetattr (pty, &tio) != -1)
273 {
274 tcflag_t new_cflag = tio.c_iflag;
275
276 if (on)
277 new_cflag |= IUTF8;
278 else
279 new_cflag &= ~IUTF8;
280
281 if (new_cflag != tio.c_iflag)
282 {
283 tio.c_iflag = new_cflag;
284 tcsetattr (pty, TCSANOW, &tio);
285 }
286 }
287#endif
288}
289
290static struct ttyconf {
291 gid_t gid;
292 mode_t mode;
293
294 ttyconf ()
295 {
296#ifdef TTY_GID_SUPPORT
297 struct group *gr = getgrnam ("tty");
298
299 if (gr)
300 { /* change group ownership of tty to "tty" */
301 mode = S_IRUSR | S_IWUSR | S_IWGRP;
302 gid = gr->gr_gid;
303 }
304 else
305#endif /* TTY_GID_SUPPORT */
306 {
307 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
308 gid = 0;
309 }
310 }
311} ttyconf;
312
313ptytty_unix::ptytty_unix ()
314{
315 name = 0;
316#if UTMP_SUPPORT
317 cmd_pid = 0;
318#endif
319}
320
321ptytty_unix::~ptytty_unix ()
322{
323#if UTMP_SUPPORT
324 logout ();
325#endif
326 put ();
327}
328
329void
330ptytty_unix::put ()
331{
332 chmod (name, RESTORE_TTY_MODE);
333 chown (name, 0, ttyconf.gid);
334
335 close_tty ();
336
337 if (pty >= 0)
338 close (pty);
339
340 free (name);
341
342 pty = tty = -1;
343 name = 0;
344}
345
346bool
347ptytty_unix::get ()
348{
349 /* get master (pty) */
350 if ((pty = get_pty (&tty, &name)) < 0)
351 return false;
352
353 fcntl (pty, F_SETFL, O_NONBLOCK);
354
355 /* get slave (tty) */
356 if (tty < 0)
357 {
358#ifndef NO_SETOWNER_TTYDEV
359 chown (name, getuid (), ttyconf.gid); /* fail silently */
360 chmod (name, ttyconf.mode);
361# ifdef HAVE_REVOKE
362 revoke (name);
222# endif 363# endif
223/* ---------------------------------------- */
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 364#endif
232/* ---------------------------------------- */ 365
233 fd = open("/dev/tty", O_RDWR | O_NOCTTY); 366 if ((tty = get_tty (name)) < 0)
234 D_TTY((stderr, "rxvt_control_tty(): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)")); 367 {
235 if (fd >= 0) 368 put ();
236 close(fd); /* ouch: still have controlling tty */ 369 return false;
237/* ---------------------------------------- */ 370 }
238#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) 371 }
239/* 372
240 * Push STREAMS modules: 373 return true;
241 * ptem: pseudo-terminal hardware emulation module. 374}
242 * ldterm: standard terminal line discipline. 375
243 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 376#if PTYTTY_HELPER
244 * 377
245 * After we push the STREAMS modules, the first open() on the slave side 378static int sock_fd = -1;
246 * (i.e. the next section between the dashes giving us "tty opened OK") 379static int helper_pid, owner_pid;
247 * should make the "ptem" (or "ldterm" depending upon either which OS 380
248 * version or which set of manual pages you have) module give us a 381struct command
249 * controlling terminal. We must already have close()d the master side 382{
250 * fd in this child process before we push STREAMS modules on because the 383 enum { get, login, destroy } type;
251 * documentation is really unclear about whether it is any close() on 384
252 * the master side or the last close() - i.e. a proper STREAMS dismantling 385 ptytty *id;
253 * close() - on the master side which causes a hang up to be sent 386
254 * through - Geoff Wing 387 bool login_shell;
255 */ 388 int cmd_pid;
256# ifdef HAVE_ISASTREAM 389 char hostname[512]; // arbitrary, but should be plenty
257 if (isastream(fd_tty) == 1) 390};
391
392struct ptytty_proxy : ptytty
393{
394 ptytty *id;
395
396 ptytty_proxy ()
397 : id(0)
398 {
399 }
400
401 ~ptytty_proxy ();
402
403 bool get ();
404 void login (int cmd_pid, bool login_shell, const char *hostname);
405};
406
407bool
408ptytty_proxy::get ()
409{
410 command cmd;
411
412 cmd.type = command::get;
413
414 write (sock_fd, &cmd, sizeof (cmd));
415
416 if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
417 ptytty_fatal ("protocol error while creating pty using helper process, aborting.\n");
418
419 if (!id)
420 return false;
421
422 if ((pty = recv_fd (sock_fd)) < 0
423 || (tty = recv_fd (sock_fd)) < 0)
424 ptytty_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
425
426 return true;
427}
428
429void
430ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
431{
432 command cmd;
433
434 cmd.type = command::login;
435 cmd.id = id;
436 cmd.cmd_pid = cmd_pid;
437 cmd.login_shell = login_shell;
438 strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
439
440 write (sock_fd, &cmd, sizeof (cmd));
441}
442
443ptytty_proxy::~ptytty_proxy ()
444{
445 if (id)
446 {
447 command cmd;
448
449 cmd.type = command::destroy;
450 cmd.id = id;
451
452 write (sock_fd, &cmd, sizeof (cmd));
453 }
454}
455
456static
457void serve ()
458{
459 command cmd;
460 vector<ptytty *> ptys;
461
462 while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
463 {
464 if (cmd.type == command::get)
465 {
466 // -> id ptyfd ttyfd
467 cmd.id = new ptytty_unix;
468
469 if (cmd.id->get ())
470 {
471 write (sock_fd, &cmd.id, sizeof (cmd.id));
472 ptys.push_back (cmd.id);
473
474 ptytty::send_fd (sock_fd, cmd.id->pty);
475 ptytty::send_fd (sock_fd, cmd.id->tty);
476 }
477 else
478 {
479 delete cmd.id;
480 cmd.id = 0;
481 write (sock_fd, &cmd.id, sizeof (cmd.id));
482 }
483 }
484 else if (cmd.type == command::login)
485 {
486#if UTMP_SUPPORT
487 if (find (ptys.begin (), ptys.end (), cmd.id))
488 {
489 cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
490 cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
491 }
258# endif 492#endif
493 }
494 else if (cmd.type == command::destroy)
495 {
496 vector<ptytty *>::iterator pty = find (ptys.begin (), ptys.end (), cmd.id);
497
498 if (pty != ptys.end ())
499 {
500 delete *pty;
501 ptys.erase (pty);
502 }
503 }
504 else
505 break;
259 { 506 }
260 D_TTY((stderr, "rxvt_control_tty(): Pushing STREAMS modules")); 507
261 ioctl(fd_tty, I_PUSH, "ptem"); 508 // destroy all ptys
262 ioctl(fd_tty, I_PUSH, "ldterm"); 509 for (vector<ptytty *>::iterator i = ptys.end (); i-- > ptys.begin (); )
263 ioctl(fd_tty, I_PUSH, "ttcompat"); 510 delete *i;
511}
512
513void
514ptytty::use_helper ()
515{
516 int pid = getpid ();
517
518 if (sock_fd >= 0 && pid == owner_pid)
519 return;
520
521 owner_pid = pid;
522
523 int sv[2];
524
525 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
526 ptytty_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
527
528 helper_pid = fork ();
529
530 if (helper_pid < 0)
531 ptytty_fatal ("could not create pty/sessiondb helper process, aborting.\n");
532
533 if (helper_pid)
264 } 534 {
265#endif 535 // client, process
266/* ---------------------------------------- */ 536 sock_fd = sv[0];
267# if defined(TIOCSCTTY) 537 close (sv[1]);
268 fd = ioctl(fd_tty, TIOCSCTTY, NULL); 538 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
269 D_TTY((stderr, "rxvt_control_tty(): ioctl(..,TIOCSCTTY): %d", fd)); 539 }
270# elif defined(TIOCSETCTTY)
271 fd = ioctl(fd_tty, TIOCSETCTTY, NULL);
272 D_TTY((stderr, "rxvt_control_tty(): ioctl(..,TIOCSETCTTY): %d", fd));
273# else 540 else
274 fd = open(ttydev, O_RDWR); 541 {
275 D_TTY((stderr, "rxvt_control_tty(): tty open%s", fd < 0 ? " failure" : "ed OK")); 542 // server, pty-helper
276 if (fd >= 0) 543 sock_fd = sv[1];
277 close(fd); 544
545 chdir ("/");
546
547 for (int fd = 0; fd < 1023; fd++)
548 if (fd != sock_fd)
549 close (fd);
550
551 serve ();
552 _exit (EXIT_SUCCESS);
553 }
554}
555
278# endif 556#endif
279/* ---------------------------------------- */ 557
280 fd = open("/dev/tty", O_WRONLY); 558ptytty *
281 D_TTY((stderr, "rxvt_control_tty(): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)")); 559ptytty::create ()
282 if (fd < 0) 560{
283 return -1; /* fatal */ 561#if PTYTTY_HELPER
284 close(fd); 562 if (helper_pid && getpid () == owner_pid)
285/* ---------------------------------------- */ 563 // use helper process
286 D_TTY((stderr, "rxvt_control_tty(): tcgetpgrp(): %d getpgrp(): %d", tcgetpgrp(fd_tty), getpgrp())); 564 return new ptytty_proxy;
287/* ---------------------------------------- */ 565 else
288#endif /* ! __QNX__ */ 566#endif
289 return 0; 567 return new ptytty_unix;
290} 568}
291/*----------------------- end-of-file (C source) -----------------------*/ 569
570void
571ptytty::init ()
572{
573 uid_t uid = getuid ();
574 gid_t gid = getgid ();
575
576 // before doing anything else, check for setuid/setgid operation,
577 // start the helper process and drop privileges
578 if (uid != geteuid ()
579 || gid != getegid ())
580 {
581#if PTYTTY_HELPER
582 use_helper ();
583#else
584 ptytty_warn ("running setuid/setgid without pty helper compiled in, continuing unprivileged.\n");
585#endif
586
587 drop_privileges ();
588 }
589}
590
591void
592ptytty::drop_privileges ()
593{
594 uid_t uid = getuid ();
595 gid_t gid = getgid ();
596
597 // drop privileges
598#if HAVE_SETRESUID
599 setresgid (gid, gid, gid);
600 setresuid (uid, uid, uid);
601#elif HAVE_SETREUID
602 setregid (gid, gid);
603 setreuid (uid, uid);
604#elif HAVE_SETUID
605 setgid (gid);
606 setuid (uid);
607#endif
608
609 if (uid != geteuid ()
610 || gid != getegid ())
611 ptytty_fatal ("unable to drop privileges, aborting.\n");
612}
613

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