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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 1.56 by root, Sun Jan 22 04:01:52 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>
8 * 11 *
9 * This program is free software; you can redistribute it and/or modify 12 * 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 13 * 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 14 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version. 15 * (at your option) any later version.
… …
19 * You should have received a copy of the GNU General Public License 22 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software 23 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *---------------------------------------------------------------------*/ 25 *---------------------------------------------------------------------*/
23 26
24#include "../config.h" /* NECESSARY */ 27#include "../config.h"
25 28
26/* 29#include "ptytty.h"
27 * Try to be self-contained except for the above autoconfig'd defines
28 */
29 30
30#include <stdio.h>
31#ifdef HAVE_STDLIB_H
32# include <stdlib.h> 31#include <cstdlib>
33#endif 32#include <cstring>
34#ifdef HAVE_SYS_TYPES_H 33
35# include <sys/types.h> 34#include <sys/types.h>
36#endif 35#include <sys/socket.h>
37#ifdef HAVE_UNISTD_H
38# include <unistd.h> 36#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> 37#include <fcntl.h>
45#endif 38
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(HAVE_DEV_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#ifdef TTY_GID_SUPPORT
56#include <grp.h>
57#endif
58
59#include <cstdio>
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 */ 71#if defined(UNIX98_PTY)
69int 72static int
70rxvt_get_pty(int *fd_tty, const char **ttydev) 73get_pty (int *fd_tty, char **ttydev)
71{ 74{
72 int pfd; 75 int pfd;
73 76
74#ifdef PTYS_ARE_OPENPTY 77# 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(); 78 pfd = getpt();
79# elif defined(HAVE_POSIX_OPENPT)
80 pfd = posix_openpt (O_RDWR);
104# else 81# else
105 pfd = open("/dev/ptmx", O_RDWR | O_NOCTTY, 0); 82 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 83# endif
117#endif 84 if (pfd >= 0)
85 {
86 if (grantpt (pfd) == 0 /* change slave permissions */
87 && unlockpt (pfd) == 0)
88 { /* slave now unlocked */
89 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
90 return pfd;
91 }
118 92
119#ifdef PTYS_ARE_PTC 93 close (pfd);
94 }
95
96 return -1;
97}
98#elif defined(HAVE_OPENPTY)
99static int
100get_pty (int *fd_tty, char **ttydev)
101{
102 int pfd;
103 int res;
104 char tty_name[32];
105
106 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
107 if (res != -1)
108 {
109 *ttydev = strdup (tty_name);
110 return pfd;
111 }
112
113 return -1;
114}
115#elif defined(HAVE__GETPTY)
116static int
117get_pty (int *fd_tty, char **ttydev)
118{
119 int pfd;
120
121 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
122 if (*ttydev != NULL)
123 return pfd;
124
125 return -1;
126}
127#elif defined(HAVE_DEV_PTC)
128static int
129get_pty (int *fd_tty, char **ttydev)
130{
131 int pfd;
132
120 if ((pfd = open("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) { 133 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
121 *ttydev = ttyname(pfd);
122 return pfd;
123 } 134 {
124#endif 135 *ttydev = strdup (ttyname (pfd));
136 return pfd;
137 }
125 138
126#ifdef PTYS_ARE_CLONE 139 return -1;
140}
141#elif defined(HAVE_DEV_CLONE)
142static int
143get_pty (int *fd_tty, char **ttydev)
144{
145 int pfd;
146
127 if ((pfd = open("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) { 147 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
128 *ttydev = ptsname(pfd);
129 return pfd;
130 } 148 {
131#endif 149 *ttydev = strdup (ptsname (pfd));
132 150 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 } 151 }
152
153 return -1;
154}
155#else
156/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
157static int
158get_pty (int *fd_tty, char **ttydev)
159{
160 int pfd;
161 int i;
162 char pty_name[32];
163 char tty_name[32];
164 const char *majors = "pqrstuvwxyzabcde";
165 const char *minors = "0123456789abcdef";
166 for (i = 0; i < 256; i++)
167 {
168 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
169 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
170 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
171 {
172 snprintf(pty_name, 32, "/dev/ptyp%d", i);
173 snprintf(tty_name, 32, "/dev/ttyp%d", i);
149 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) { 174 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
175 continue;
176 }
150 if (access(tty_name, R_OK | W_OK) == 0) { 177 if (access (tty_name, R_OK | W_OK) == 0)
178 {
151 *ttydev = strdup(tty_name); 179 *ttydev = strdup (tty_name);
152 return pfd; 180 return pfd;
153 } 181 }
154 close(pfd); 182
183 close (pfd);
155 } 184 }
156 } 185}
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 186#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}
190 187
191/*----------------------------------------------------------------------*/ 188/*----------------------------------------------------------------------*/
192/* 189/*
193 * Returns tty file descriptor, or -1 on failure 190 * Returns tty file descriptor, or -1 on failure
194 */ 191 */
195/* EXTPROTO */ 192static int
196int
197rxvt_get_tty(const char *ttydev) 193get_tty (char *ttydev)
198{ 194{
199 return open(ttydev, O_RDWR | O_NOCTTY, 0); 195 return open (ttydev, O_RDWR | O_NOCTTY, 0);
200} 196}
201 197
202/*----------------------------------------------------------------------*/ 198/*----------------------------------------------------------------------*/
203/* 199/*
204 * Make our tty a controlling tty so that /dev/tty points to us 200 * Make our tty a controlling tty so that /dev/tty points to us
205 */ 201 */
206/* EXTPROTO */ 202static int
207int 203control_tty (int fd_tty)
208rxvt_control_tty(int fd_tty, const char *ttydev)
209{ 204{
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(); 205 setsid ();
206
207#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
208 /*
209 * Push STREAMS modules:
210 * ptem: pseudo-terminal hardware emulation module.
211 * ldterm: standard terminal line discipline.
212 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
213 *
214 * After we push the STREAMS modules, the first open () on the slave side
215 * (i.e. the next section between the dashes giving us "tty opened OK")
216 * should make the "ptem" (or "ldterm" depending upon either which OS
217 * version or which set of manual pages you have) module give us a
218 * controlling terminal. We must already have close ()d the master side
219 * fd in this child process before we push STREAMS modules on because the
220 * documentation is really unclear about whether it is any close () on
221 * the master side or the last close () - i.e. a proper STREAMS dismantling
222 * close () - on the master side which causes a hang up to be sent
223 * through - Geoff Wing
224 */
225# ifdef HAVE_ISASTREAM
226 if (isastream (fd_tty) == 1)
217# endif 227# endif
218# if defined(HAVE_SETPGID) 228 {
219 setpgid(0, 0); 229 ioctl (fd_tty, I_PUSH, "ptem");
220# elif defined(HAVE_SETPGRP) 230 ioctl (fd_tty, I_PUSH, "ldterm");
221 setpgrp(0, 0); 231 ioctl (fd_tty, I_PUSH, "ttcompat");
232 }
233#endif
234
235 ioctl (fd_tty, TIOCSCTTY, NULL);
236
237 int fd = open ("/dev/tty", O_WRONLY);
238 if (fd < 0)
239 return -1; /* fatal */
240
241 close (fd);
242
243 return 0;
244}
245
246void
247ptytty::close_tty ()
248{
249 if (tty < 0)
250 return;
251
252 close (tty);
253 tty = -1;
254}
255
256bool
257ptytty::make_controlling_tty ()
258{
259 return control_tty (tty) >= 0;
260}
261
262void
263ptytty::set_utf8_mode (bool on)
264{
265#ifdef IUTF8
266 if (pty < 0)
267 return;
268
269 struct termios tio;
270
271 if (tcgetattr (pty, &tio) != -1)
272 {
273 tcflag_t new_cflag = tio.c_iflag;
274
275 if (on)
276 new_cflag |= IUTF8;
277 else
278 new_cflag &= ~IUTF8;
279
280 if (new_cflag != tio.c_iflag)
281 {
282 tio.c_iflag = new_cflag;
283 tcsetattr (pty, TCSANOW, &tio);
284 }
285 }
286#endif
287}
288
289static struct ttyconf {
290 gid_t gid;
291 mode_t mode;
292
293 ttyconf ()
294 {
295#ifdef TTY_GID_SUPPORT
296 struct group *gr = getgrnam ("tty");
297
298 if (gr)
299 { /* change group ownership of tty to "tty" */
300 mode = S_IRUSR | S_IWUSR | S_IWGRP;
301 gid = gr->gr_gid;
302 }
303 else
304#endif /* TTY_GID_SUPPORT */
305 {
306 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
307 gid = 0;
308 }
309 }
310} ttyconf;
311
312ptytty_unix::ptytty_unix ()
313{
314 name = 0;
315#if UTMP_SUPPORT
316 cmd_pid = 0;
317#endif
318}
319
320ptytty_unix::~ptytty_unix ()
321{
322#if UTMP_SUPPORT
323 logout ();
324#endif
325 put ();
326}
327
328void
329ptytty_unix::put ()
330{
331 chmod (name, RESTORE_TTY_MODE);
332 chown (name, 0, ttyconf.gid);
333
334 close_tty ();
335
336 if (pty >= 0)
337 close (pty);
338
339 free (name);
340
341 pty = tty = -1;
342 name = 0;
343}
344
345bool
346ptytty_unix::get ()
347{
348 /* get master (pty) */
349 if ((pty = get_pty (&tty, &name)) < 0)
350 return false;
351
352 fcntl (pty, F_SETFL, O_NONBLOCK);
353
354 /* get slave (tty) */
355 if (tty < 0)
356 {
357#ifndef NO_SETOWNER_TTYDEV
358 chown (name, getuid (), ttyconf.gid); /* fail silently */
359 chmod (name, ttyconf.mode);
360# ifdef HAVE_REVOKE
361 revoke (name);
222# endif 362# 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 363#endif
232/* ---------------------------------------- */ 364
233 fd = open("/dev/tty", O_RDWR | O_NOCTTY); 365 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)")); 366 {
235 if (fd >= 0) 367 put ();
236 close(fd); /* ouch: still have controlling tty */ 368 return false;
237/* ---------------------------------------- */ 369 }
238#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) 370 }
239/* 371
240 * Push STREAMS modules: 372 return true;
241 * ptem: pseudo-terminal hardware emulation module. 373}
242 * ldterm: standard terminal line discipline. 374
243 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 375#if PTYTTY_HELPER
244 * 376
245 * After we push the STREAMS modules, the first open() on the slave side 377static int sock_fd = -1;
246 * (i.e. the next section between the dashes giving us "tty opened OK") 378static int helper_pid, owner_pid;
247 * should make the "ptem" (or "ldterm" depending upon either which OS 379
248 * version or which set of manual pages you have) module give us a 380struct command
249 * controlling terminal. We must already have close()d the master side 381{
250 * fd in this child process before we push STREAMS modules on because the 382 enum { get, login, destroy } type;
251 * documentation is really unclear about whether it is any close() on 383
252 * the master side or the last close() - i.e. a proper STREAMS dismantling 384 ptytty *id;
253 * close() - on the master side which causes a hang up to be sent 385
254 * through - Geoff Wing 386 bool login_shell;
255 */ 387 int cmd_pid;
256# ifdef HAVE_ISASTREAM 388 char hostname[512]; // arbitrary, but should be plenty
257 if (isastream(fd_tty) == 1) 389};
390
391struct ptytty_proxy : ptytty
392{
393 ptytty *id;
394
395 ptytty_proxy ()
396 : id(0)
397 {
398 }
399
400 ~ptytty_proxy ();
401
402 bool get ();
403 void login (int cmd_pid, bool login_shell, const char *hostname);
404};
405
406bool
407ptytty_proxy::get ()
408{
409 command cmd;
410
411 cmd.type = command::get;
412
413 write (sock_fd, &cmd, sizeof (cmd));
414
415 if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
416 ptytty_fatal ("protocol error while creating pty using helper process, aborting.\n");
417
418 if (!id)
419 return false;
420
421 if ((pty = recv_fd (sock_fd)) < 0
422 || (tty = recv_fd (sock_fd)) < 0)
423 ptytty_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
424
425 return true;
426}
427
428void
429ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
430{
431 command cmd;
432
433 cmd.type = command::login;
434 cmd.id = id;
435 cmd.cmd_pid = cmd_pid;
436 cmd.login_shell = login_shell;
437 strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
438
439 write (sock_fd, &cmd, sizeof (cmd));
440}
441
442ptytty_proxy::~ptytty_proxy ()
443{
444 if (id)
445 {
446 command cmd;
447
448 cmd.type = command::destroy;
449 cmd.id = id;
450
451 write (sock_fd, &cmd, sizeof (cmd));
452 }
453}
454
455static
456void serve ()
457{
458 command cmd;
459 vector<ptytty *> ptys;
460
461 while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
462 {
463 if (cmd.type == command::get)
464 {
465 // -> id ptyfd ttyfd
466 cmd.id = new ptytty_unix;
467
468 if (cmd.id->get ())
469 {
470 write (sock_fd, &cmd.id, sizeof (cmd.id));
471 ptys.push_back (cmd.id);
472
473 ptytty::send_fd (sock_fd, cmd.id->pty);
474 ptytty::send_fd (sock_fd, cmd.id->tty);
475 }
476 else
477 {
478 delete cmd.id;
479 cmd.id = 0;
480 write (sock_fd, &cmd.id, sizeof (cmd.id));
481 }
482 }
483 else if (cmd.type == command::login)
484 {
485#if UTMP_SUPPORT
486 if (find (ptys.begin (), ptys.end (), cmd.id))
487 {
488 cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
489 cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
490 }
258# endif 491#endif
492 }
493 else if (cmd.type == command::destroy)
494 {
495 vector<ptytty *>::iterator pty = find (ptys.begin (), ptys.end (), cmd.id);
496
497 if (pty != ptys.end ())
498 {
499 delete *pty;
500 ptys.erase (pty);
501 }
502 }
503 else
504 break;
259 { 505 }
260 D_TTY((stderr, "rxvt_control_tty(): Pushing STREAMS modules")); 506
261 ioctl(fd_tty, I_PUSH, "ptem"); 507 // destroy all ptys
262 ioctl(fd_tty, I_PUSH, "ldterm"); 508 for (vector<ptytty *>::iterator i = ptys.end (); i-- > ptys.begin (); )
263 ioctl(fd_tty, I_PUSH, "ttcompat"); 509 delete *i;
510}
511
512void
513ptytty::use_helper ()
514{
515 int pid = getpid ();
516
517 if (sock_fd >= 0 && pid == owner_pid)
518 return;
519
520 owner_pid = pid;
521
522 int sv[2];
523
524 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
525 ptytty_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
526
527 helper_pid = fork ();
528
529 if (helper_pid < 0)
530 ptytty_fatal ("could not create pty/sessiondb helper process, aborting.\n");
531
532 if (helper_pid)
264 } 533 {
265#endif 534 // client, process
266/* ---------------------------------------- */ 535 sock_fd = sv[0];
267# if defined(TIOCSCTTY) 536 close (sv[1]);
268 fd = ioctl(fd_tty, TIOCSCTTY, NULL); 537 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
269 D_TTY((stderr, "rxvt_control_tty(): ioctl(..,TIOCSCTTY): %d", fd)); 538 }
270# elif defined(TIOCSETCTTY)
271 fd = ioctl(fd_tty, TIOCSETCTTY, NULL);
272 D_TTY((stderr, "rxvt_control_tty(): ioctl(..,TIOCSETCTTY): %d", fd));
273# else 539 else
274 fd = open(ttydev, O_RDWR); 540 {
275 D_TTY((stderr, "rxvt_control_tty(): tty open%s", fd < 0 ? " failure" : "ed OK")); 541 // server, pty-helper
276 if (fd >= 0) 542 sock_fd = sv[1];
277 close(fd); 543
544 chdir ("/");
545
546 for (int fd = 0; fd < 1023; fd++)
547 if (fd != sock_fd)
548 close (fd);
549
550 serve ();
551 _exit (EXIT_SUCCESS);
552 }
553}
554
278# endif 555#endif
279/* ---------------------------------------- */ 556
280 fd = open("/dev/tty", O_WRONLY); 557ptytty *
281 D_TTY((stderr, "rxvt_control_tty(): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)")); 558ptytty::create ()
282 if (fd < 0) 559{
283 return -1; /* fatal */ 560#if PTYTTY_HELPER
284 close(fd); 561 if (helper_pid && getpid () == owner_pid)
285/* ---------------------------------------- */ 562 // use helper process
286 D_TTY((stderr, "rxvt_control_tty(): tcgetpgrp(): %d getpgrp(): %d", tcgetpgrp(fd_tty), getpgrp())); 563 return new ptytty_proxy;
287/* ---------------------------------------- */ 564 else
288#endif /* ! __QNX__ */ 565#endif
289 return 0; 566 return new ptytty_unix;
290} 567}
291/*----------------------- end-of-file (C source) -----------------------*/ 568
569void
570ptytty::init ()
571{
572 uid_t uid = getuid ();
573 gid_t gid = getgid ();
574
575 // before doing anything else, check for setuid/setgid operation,
576 // start the helper process and drop privileges
577 if (uid != geteuid ()
578 || gid != getegid ())
579 {
580#if PTYTTY_HELPER
581 use_helper ();
582#else
583 ptytty_warn ("running setuid/setgid without pty helper compiled in, continuing unprivileged.\n");
584#endif
585
586 drop_privileges ();
587 }
588}
589
590void
591ptytty::drop_privileges ()
592{
593 uid_t uid = getuid ();
594 gid_t gid = getgid ();
595
596 // drop privileges
597#if HAVE_SETRESUID
598 setresgid (gid, gid, gid);
599 setresuid (uid, uid, uid);
600#elif HAVE_SETREUID
601 setregid (gid, gid);
602 setreuid (uid, uid);
603#elif HAVE_SETUID
604 setgid (gid);
605 setuid (uid);
606#endif
607
608 if (uid != geteuid ()
609 || gid != getegid ())
610 ptytty_fatal ("unable to drop privileges, aborting.\n");
611}
612

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