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Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.10 by pcg, Fri Apr 2 20:41:01 2004 UTC vs.
Revision 1.59 by root, Mon Jan 23 12:05:12 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 * 7 *
5 * All portions of code are copyright by their respective author/s. 8 * All portions of code are copyright by their respective author/s.
6 * 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>
7 * 12 *
8 * 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
9 * 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
10 * the Free Software Foundation; either version 2 of the License, or 15 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version. 16 * (at your option) any later version.
… …
18 * 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
19 * along with this program; if not, write to the Free Software 24 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *---------------------------------------------------------------------*/ 26 *---------------------------------------------------------------------*/
22 27
23#include "../config.h" /* NECESSARY */ 28#include "../config.h"
24 29
25/* 30#include "ptytty.h"
26 * Try to be self-contained except for the above autoconfig'd defines
27 */
28 31
29#if 0
30#ifdef HAVE_GETPT
31# define _GNU_SOURCE
32#endif
33#endif
34
35#include <cstdio>
36#ifdef HAVE_STDLIB_H
37# include <cstdlib> 32#include <cstdlib>
38#endif 33#include <cstring>
39#ifdef HAVE_SYS_TYPES_H 34#include <csignal>
35
40# include <sys/types.h> 36#include <sys/types.h>
41#endif 37#include <sys/socket.h>
42#ifdef HAVE_UNISTD_H
43# include <unistd.h> 38#include <unistd.h>
44#endif
45#if defined(HAVE_STRING_H)
46# include <cstring>
47#endif
48#ifdef HAVE_FCNTL_H
49# include <fcntl.h> 39#include <fcntl.h>
50#endif 40
51#ifdef HAVE_SYS_IOCTL_H 41#ifdef HAVE_SYS_IOCTL_H
52# include <sys/ioctl.h> 42# include <sys/ioctl.h>
53#endif 43#endif
54#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__) 44#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
55# include <sys/stropts.h> /* for I_PUSH */ 45# include <sys/stropts.h> /* for I_PUSH */
56#endif 46#endif
57#ifdef HAVE_ISASTREAM 47#ifdef HAVE_ISASTREAM
58# include <stropts.h> 48# include <stropts.h>
59#endif 49#endif
60 50#if defined(HAVE_PTY_H)
61#ifdef DEBUG_TTY 51# include <pty.h>
62# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr) 52#elif defined(HAVE_LIBUTIL_H)
63#else 53# include <libutil.h>
64# define D_TTY(x) 54#elif defined(HAVE_UTIL_H)
55# include <util.h>
65#endif 56#endif
57#ifdef TTY_GID_SUPPORT
58#include <grp.h>
59#endif
60
61#include <cstdio>
62
63/////////////////////////////////////////////////////////////////////////////
66 64
67/* ------------------------------------------------------------------------- * 65/* ------------------------------------------------------------------------- *
68 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 66 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
69 * ------------------------------------------------------------------------- */ 67 * ------------------------------------------------------------------------- */
70/* 68/*
71 * Returns pty file descriptor, or -1 on failure 69 * Returns pty file descriptor, or -1 on failure
72 * 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.
73 * 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
74 */ 72 */
75/* EXTPROTO */ 73#if defined(UNIX98_PTY)
76int 74static int
77rxvt_get_pty (int *fd_tty, const char **ttydev) 75get_pty (int *fd_tty, char **ttydev)
78{ 76{
79 int pfd; 77 int pfd;
80 78
81#ifdef PTYS_ARE_OPENPTY 79# if defined(HAVE_GETPT)
80 pfd = getpt();
81# elif defined(HAVE_POSIX_OPENPT)
82 pfd = posix_openpt (O_RDWR);
83# else
84 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0);
85# endif
86 if (pfd >= 0)
87 {
88 if (grantpt (pfd) == 0 /* change slave permissions */
89 && unlockpt (pfd) == 0)
90 { /* slave now unlocked */
91 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
92 return pfd;
93 }
82 94
83 char tty_name[sizeof "/dev/pts/????\0"]; 95 close (pfd);
96 }
84 97
98 return -1;
99}
100#elif defined(HAVE_OPENPTY)
101static int
102get_pty (int *fd_tty, char **ttydev)
103{
104 int pfd;
105 int res;
106 char tty_name[32];
107
85 if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -1) 108 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
109 if (res != -1)
86 { 110 {
87 *ttydev = strdup (tty_name); 111 *ttydev = strdup (tty_name);
88 return pfd; 112 return pfd;
89 } 113 }
90#endif
91 114
92#ifdef PTYS_ARE__GETPTY 115 return -1;
116}
117#elif defined(HAVE__GETPTY)
118static int
119get_pty (int *fd_tty, char **ttydev)
120{
121 int pfd;
122
93 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 123 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
94 if (*ttydev != NULL) 124 if (*ttydev != NULL)
95 return pfd; 125 return pfd;
96#endif
97 126
98#ifdef PTYS_ARE_GETPTY 127 return -1;
128}
129#elif defined(HAVE_DEV_PTC)
130static int
131get_pty (int *fd_tty, char **ttydev)
132{
133 int pfd;
99 134
100 char *ptydev;
101
102 while ((ptydev = getpty ()) != NULL)
103 if ((pfd = open (ptydev, O_RDWR | O_NOCTTY, 0)) >= 0)
104 {
105 *ttydev = ptydev;
106 return pfd;
107 }
108#endif
109
110#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
111# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX)
112
113 {
114# ifdef PTYS_ARE_GETPT
115 pfd = getpt ();
116# else
117
118 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
119# endif
120
121 if (pfd >= 0)
122 {
123 if (grantpt (pfd) == 0 /* change slave permissions */
124 && unlockpt (pfd) == 0)
125 { /* slave now unlocked */
126 *ttydev = ptsname (pfd); /* get slave's name */
127 return pfd;
128 }
129 close (pfd);
130 }
131 }
132# endif
133#endif
134
135#ifdef PTYS_ARE_PTC
136 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) 135 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
137 { 136 {
138 *ttydev = ttyname (pfd); 137 *ttydev = strdup (ttyname (pfd));
139 return pfd; 138 return pfd;
140 } 139 }
141#endif
142 140
143#ifdef PTYS_ARE_CLONE 141 return -1;
142}
143#elif defined(HAVE_DEV_CLONE)
144static int
145get_pty (int *fd_tty, char **ttydev)
146{
147 int pfd;
148
144 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) 149 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
145 { 150 {
146 *ttydev = ptsname (pfd); 151 *ttydev = strdup (ptsname (pfd));
147 return pfd; 152 return pfd;
148 } 153 }
149#endif
150 154
151#ifdef PTYS_ARE_NUMERIC
152 {
153 int idx;
154 char *c1, *c2;
155 char pty_name[] = "/dev/ptyp???";
156 char tty_name[] = "/dev/ttyp???";
157
158 c1 = & (pty_name[sizeof (pty_name) - 4]);
159 c2 = & (tty_name[sizeof (tty_name) - 4]);
160 for (idx = 0; idx < 256; idx++)
161 {
162 sprintf (c1, "%d", idx);
163 sprintf (c2, "%d", idx);
164 if (access (tty_name, F_OK) < 0)
165 {
166 idx = 256;
167 break;
168 }
169 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
170 {
171 if (access (tty_name, R_OK | W_OK) == 0)
172 {
173 *ttydev = strdup (tty_name);
174 return pfd;
175 }
176 close (pfd);
177 }
178 }
179 }
180#endif
181#ifdef PTYS_ARE_SEARCHED
182 {
183 const char *c1, *c2;
184 char pty_name[] = "/dev/pty??";
185 char tty_name[] = "/dev/tty??";
186
187# ifndef PTYCHAR1
188# define PTYCHAR1 "pqrstuvwxyz"
189# endif
190# ifndef PTYCHAR2
191# define PTYCHAR2 "0123456789abcdef"
192# endif
193
194 for (c1 = PTYCHAR1; *c1; c1++)
195 {
196 pty_name[ (sizeof (pty_name) - 3)] =
197 tty_name[ (sizeof (pty_name) - 3)] = *c1;
198 for (c2 = PTYCHAR2; *c2; c2++)
199 {
200 pty_name[ (sizeof (pty_name) - 2)] =
201 tty_name[ (sizeof (pty_name) - 2)] = *c2;
202 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
203 {
204 if (access (tty_name, R_OK | W_OK) == 0)
205 {
206 *ttydev = strdup (tty_name);
207 return pfd;
208 }
209 close (pfd);
210 }
211 }
212 }
213 }
214#endif
215 return -1; 155 return -1;
216} 156}
157#else
158/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */
159static int
160get_pty (int *fd_tty, char **ttydev)
161{
162 int pfd;
163 int i;
164 char pty_name[32];
165 char tty_name[32];
166 const char *majors = "pqrstuvwxyzabcde";
167 const char *minors = "0123456789abcdef";
168 for (i = 0; i < 256; i++)
169 {
170 snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]);
171 snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]);
172 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
173 {
174 snprintf(pty_name, 32, "/dev/ptyp%d", i);
175 snprintf(tty_name, 32, "/dev/ttyp%d", i);
176 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
177 continue;
178 }
179 if (access (tty_name, R_OK | W_OK) == 0)
180 {
181 *ttydev = strdup (tty_name);
182 return pfd;
183 }
184
185 close (pfd);
186 }
187}
188#endif
217 189
218/*----------------------------------------------------------------------*/ 190/*----------------------------------------------------------------------*/
219/* 191/*
220 * Returns tty file descriptor, or -1 on failure 192 * Returns tty file descriptor, or -1 on failure
221 */ 193 */
222/* EXTPROTO */ 194static int
223int
224rxvt_get_tty (const char *ttydev) 195get_tty (char *ttydev)
225{ 196{
226 return open (ttydev, O_RDWR | O_NOCTTY, 0); 197 return open (ttydev, O_RDWR | O_NOCTTY, 0);
227} 198}
228 199
229/*----------------------------------------------------------------------*/ 200/*----------------------------------------------------------------------*/
230/* 201/*
231 * Make our tty a controlling tty so that /dev/tty points to us 202 * Make our tty a controlling tty so that /dev/tty points to us
232 */ 203 */
233/* EXTPROTO */ 204static int
234int 205control_tty (int fd_tty)
235rxvt_control_tty (int fd_tty, const char *ttydev)
236{ 206{
237#ifndef __QNX__
238 int fd;
239
240 D_TTY ((stderr, "rxvt_control_tty (): pid: %d, tty fd: %d, dev: %s", getpid (), fd_tty, ttydev));
241 /* ---------------------------------------- */
242# ifdef HAVE_SETSID
243 setsid (); 207 setsid ();
244# endif
245# if defined(HAVE_SETPGID)
246 setpgid (0, 0);
247# elif defined(HAVE_SETPGRP)
248 setpgrp (0, 0);
249# endif
250 /* ---------------------------------------- */
251# ifdef TIOCNOTTY
252 208
253 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
254 D_TTY ((stderr, "rxvt_control_tty (): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
255 if (fd >= 0)
256 {
257 ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
258 close (fd);
259 }
260# endif
261 /* ---------------------------------------- */
262 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
263 D_TTY ((stderr, "rxvt_control_tty (): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
264 if (fd >= 0)
265 close (fd); /* ouch: still have controlling tty */
266 /* ---------------------------------------- */
267#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) 209#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
268 /* 210 /*
269 * Push STREAMS modules: 211 * Push STREAMS modules:
270 * ptem: pseudo-terminal hardware emulation module. 212 * ptem: pseudo-terminal hardware emulation module.
271 * ldterm: standard terminal line discipline. 213 * ldterm: standard terminal line discipline.
272 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 214 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
… …
284 */ 226 */
285# ifdef HAVE_ISASTREAM 227# ifdef HAVE_ISASTREAM
286 if (isastream (fd_tty) == 1) 228 if (isastream (fd_tty) == 1)
287# endif 229# endif
288 { 230 {
289 D_TTY ((stderr, "rxvt_control_tty (): Pushing STREAMS modules"));
290 ioctl (fd_tty, I_PUSH, "ptem"); 231 ioctl (fd_tty, I_PUSH, "ptem");
291 ioctl (fd_tty, I_PUSH, "ldterm"); 232 ioctl (fd_tty, I_PUSH, "ldterm");
292 ioctl (fd_tty, I_PUSH, "ttcompat"); 233 ioctl (fd_tty, I_PUSH, "ttcompat");
293 } 234 }
294#endif 235#endif
295 /* ---------------------------------------- */ 236
296# if defined(TIOCSCTTY)
297 fd = ioctl (fd_tty, TIOCSCTTY, NULL); 237 ioctl (fd_tty, TIOCSCTTY, NULL);
298 D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSCTTY): %d", fd)); 238
299# elif defined(TIOCSETCTTY) 239 int fd = open ("/dev/tty", O_WRONLY);
300 fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
301 D_TTY ((stderr, "rxvt_control_tty (): ioctl (..,TIOCSETCTTY): %d", fd));
302# else
303 fd = open (ttydev, O_RDWR);
304 D_TTY ((stderr, "rxvt_control_tty (): tty open%s", fd < 0 ? " failure" : "ed OK"));
305 if (fd >= 0) 240 if (fd < 0)
241 return -1; /* fatal */
242
306 close (fd); 243 close (fd);
244
245 return 0;
246}
247
248void
249ptytty::close_tty ()
250{
251 if (tty < 0)
252 return;
253
254 close (tty);
255 tty = -1;
256}
257
258bool
259ptytty::make_controlling_tty ()
260{
261 return control_tty (tty) >= 0;
262}
263
264void
265ptytty::set_utf8_mode (bool on)
266{
267#ifdef IUTF8
268 if (pty < 0)
269 return;
270
271 struct termios tio;
272
273 if (tcgetattr (pty, &tio) != -1)
274 {
275 tcflag_t new_cflag = tio.c_iflag;
276
277 if (on)
278 new_cflag |= IUTF8;
279 else
280 new_cflag &= ~IUTF8;
281
282 if (new_cflag != tio.c_iflag)
283 {
284 tio.c_iflag = new_cflag;
285 tcsetattr (pty, TCSANOW, &tio);
286 }
287 }
288#endif
289}
290
291static struct ttyconf {
292 gid_t gid;
293 mode_t mode;
294
295 ttyconf ()
296 {
297#ifdef TTY_GID_SUPPORT
298 struct group *gr = getgrnam ("tty");
299
300 if (gr)
301 { /* change group ownership of tty to "tty" */
302 mode = S_IRUSR | S_IWUSR | S_IWGRP;
303 gid = gr->gr_gid;
304 }
305 else
306#endif /* TTY_GID_SUPPORT */
307 {
308 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
309 gid = 0;
310 }
311 }
312} ttyconf;
313
314ptytty_unix::ptytty_unix ()
315{
316 name = 0;
317#if UTMP_SUPPORT
318 cmd_pid = 0;
319#endif
320}
321
322ptytty_unix::~ptytty_unix ()
323{
324#if UTMP_SUPPORT
325 logout ();
326#endif
327 put ();
328}
329
330void
331ptytty_unix::put ()
332{
333 chmod (name, RESTORE_TTY_MODE);
334 chown (name, 0, ttyconf.gid);
335
336 close_tty ();
337
338 if (pty >= 0)
339 close (pty);
340
341 free (name);
342
343 pty = tty = -1;
344 name = 0;
345}
346
347bool
348ptytty_unix::get ()
349{
350 /* get master (pty) */
351 if ((pty = get_pty (&tty, &name)) < 0)
352 return false;
353
354 fcntl (pty, F_SETFL, O_NONBLOCK);
355
356 /* get slave (tty) */
357 if (tty < 0)
358 {
359#ifndef NO_SETOWNER_TTYDEV
360 chown (name, getuid (), ttyconf.gid); /* fail silently */
361 chmod (name, ttyconf.mode);
362# ifdef HAVE_REVOKE
363 revoke (name);
307# endif 364# endif
308 /* ---------------------------------------- */ 365#endif
309 fd = open ("/dev/tty", O_WRONLY);
310 D_TTY ((stderr, "rxvt_control_tty (): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
311 if (fd < 0)
312 return -1; /* fatal */
313 close (fd);
314 /* ---------------------------------------- */
315 D_TTY ((stderr, "rxvt_control_tty (): tcgetpgrp (): %d getpgrp (): %d", tcgetpgrp (fd_tty), getpgrp ()));
316 /* ---------------------------------------- */
317#endif /* ! __QNX__ */
318 366
367 if ((tty = get_tty (name)) < 0)
368 {
369 put ();
370 return false;
371 }
372 }
373
374 return true;
375}
376
377/////////////////////////////////////////////////////////////////////////////
378// helper/proxy support
379
380#if PTYTTY_HELPER
381
382static int sock_fd = -1, lock_fd = -1;
383static int helper_pid, owner_pid;
384
385struct command
386{
387 enum { get, login, destroy } type;
388
389 ptytty *id;
390
391 bool login_shell;
392 int cmd_pid;
393 char hostname[512]; // arbitrary, but should be plenty
394};
395
396struct ptytty_proxy : ptytty
397{
398 ptytty *id;
399
400 ptytty_proxy ()
401 : id(0)
402 {
403 }
404
405 ~ptytty_proxy ();
406
407 bool get ();
408 void login (int cmd_pid, bool login_shell, const char *hostname);
409};
410
411#if PTYTTY_REENTRANT
412# define NEED_TOKEN do { char ch; read (lock_fd, &ch, 1); } while (0)
413# define GIVE_TOKEN do { char ch; write (lock_fd, &ch, 1); } while (0)
414#else
415# define NEED_TOKEN (void)0
416# define GIVE_TOKEN (void)0
417#endif
418
419bool
420ptytty_proxy::get ()
421{
422 NEED_TOKEN;
423
424 command cmd;
425
426 cmd.type = command::get;
427
428 write (sock_fd, &cmd, sizeof (cmd));
429
430 if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
431 ptytty_fatal ("protocol error while creating pty using helper process, aborting.\n");
432
433 if (!id)
434 {
435 GIVE_TOKEN;
436 return false;
437 }
438
439 if ((pty = recv_fd (sock_fd)) < 0
440 || (tty = recv_fd (sock_fd)) < 0)
441 ptytty_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
442
443 GIVE_TOKEN;
444 return true;
445}
446
447void
448ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
449{
450 NEED_TOKEN;
451
452 command cmd;
453
454 cmd.type = command::login;
455 cmd.id = id;
456 cmd.cmd_pid = cmd_pid;
457 cmd.login_shell = login_shell;
458 strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
459
460 write (sock_fd, &cmd, sizeof (cmd));
461
462 GIVE_TOKEN;
463}
464
465ptytty_proxy::~ptytty_proxy ()
466{
467 if (id)
468 {
469 NEED_TOKEN;
470
471 command cmd;
472
473 cmd.type = command::destroy;
474 cmd.id = id;
475
476 write (sock_fd, &cmd, sizeof (cmd));
477
478 GIVE_TOKEN;
479 }
480}
481
482static
483void serve ()
484{
485 command cmd;
486 vector<ptytty *> ptys;
487
488 for (;;)
489 {
490 GIVE_TOKEN;
491
492 if (read (sock_fd, &cmd, sizeof (command)) != sizeof (command))
493 break;
494
495 if (cmd.type == command::get)
496 {
497 // -> id ptyfd ttyfd
498 cmd.id = new ptytty_unix;
499
500 if (cmd.id->get ())
501 {
502 write (sock_fd, &cmd.id, sizeof (cmd.id));
503 ptys.push_back (cmd.id);
504
505 ptytty::send_fd (sock_fd, cmd.id->pty);
506 ptytty::send_fd (sock_fd, cmd.id->tty);
507 }
508 else
509 {
510 delete cmd.id;
511 cmd.id = 0;
512 write (sock_fd, &cmd.id, sizeof (cmd.id));
513 }
514 }
515 else if (cmd.type == command::login)
516 {
517#if UTMP_SUPPORT
518 if (find (ptys.begin (), ptys.end (), cmd.id) != ptys.end ())
519 {
520 cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
521 cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
522 }
523#endif
524 }
525 else if (cmd.type == command::destroy)
526 {
527 vector<ptytty *>::iterator pty = find (ptys.begin (), ptys.end (), cmd.id);
528
529 if (pty != ptys.end ())
530 {
531 delete *pty;
532 ptys.erase (pty);
533 }
534 }
535 else
536 break;
537
538 NEED_TOKEN;
539 }
540
541 // destroy all ptys
542 for (vector<ptytty *>::iterator i = ptys.end (); i-- > ptys.begin (); )
543 delete *i;
544}
545
546void
547ptytty::use_helper ()
548{
549#ifndef PTYTTY_NO_PID_CHECK
550 int pid = getpid ();
551#endif
552
553 if (sock_fd >= 0
554#ifndef PTYTTY_NO_PID_CHECK
555 && pid == owner_pid
556#endif
557 )
319 return 0; 558 return;
559
560#ifndef PTYTTY_NO_PID_CHECK
561 owner_pid = pid;
562#endif
563
564 int sv[2];
565
566 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
567 ptytty_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
568
569#ifdef PTYTTY_REENTRANT
570 int lv[2];
571
572 if (socketpair (AF_UNIX, SOCK_STREAM, 0, lv))
573 ptytty_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
574#endif
575
576 helper_pid = fork ();
577
578 if (helper_pid < 0)
579 ptytty_fatal ("could not create pty/sessiondb helper process, aborting.\n");
580
581 if (helper_pid)
582 {
583 // client, process
584 sock_fd = sv[0];
585 close (sv[1]);
586 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
587#ifdef PTYTTY_REENTRANT
588 lock_fd = lv[0];
589 close (lv[1]);
590 fcntl (lock_fd, F_SETFD, FD_CLOEXEC);
591#endif
592 }
593 else
594 {
595 // server, pty-helper
596 sock_fd = sv[1];
597#ifdef PTYTTY_REENTRANT
598 lock_fd = lv[1];
599#endif
600
601 chdir ("/");
602
603 signal (SIGHUP, SIG_IGN);
604 signal (SIGTERM, SIG_IGN);
605 signal (SIGINT, SIG_IGN);
606 signal (SIGPIPE, SIG_IGN);
607
608 for (int fd = 0; fd < 1023; fd++)
609 if (fd != sock_fd && fd != lock_fd)
610 close (fd);
611
612 serve ();
613 _exit (EXIT_SUCCESS);
614 }
320} 615}
321/*----------------------- end-of-file (C source) -----------------------*/ 616
617#endif
618
619ptytty *
620ptytty::create ()
621{
622#if PTYTTY_HELPER
623 if (helper_pid
624# ifndef PTYTTY_NO_PID_CHECK
625 && getpid () == owner_pid
626# endif
627 )
628 // use helper process
629 return new ptytty_proxy;
630 else
631#endif
632 return new ptytty_unix;
633}
634
635void
636ptytty::init ()
637{
638 uid_t uid = getuid ();
639 gid_t gid = getgid ();
640
641 // before doing anything else, check for setuid/setgid operation,
642 // start the helper process and drop privileges
643 if (uid != geteuid ()
644 || gid != getegid ())
645 {
646#if PTYTTY_HELPER
647 use_helper ();
648#else
649 ptytty_warn ("running setuid/setgid without pty helper compiled in, continuing unprivileged.\n");
650#endif
651
652 drop_privileges ();
653 }
654}
655
656void
657ptytty::drop_privileges ()
658{
659 uid_t uid = getuid ();
660 gid_t gid = getgid ();
661
662 // drop privileges
663#if HAVE_SETRESUID
664 setresgid (gid, gid, gid);
665 setresuid (uid, uid, uid);
666#elif HAVE_SETREUID
667 setregid (gid, gid);
668 setreuid (uid, uid);
669#elif HAVE_SETUID
670 setgid (gid);
671 setuid (uid);
672#endif
673
674 if (uid != geteuid ()
675 || gid != getegid ())
676 ptytty_fatal ("unable to drop privileges, aborting.\n");
677}
678
679/////////////////////////////////////////////////////////////////////////////
680// C API
681
682#ifndef PTYTTY_NO_C_API
683
684#define DEFINE_METHOD(retval, name, args1, args2) \
685extern "C" retval ptytty_ ## name args1 \
686{ return ((struct ptytty *)ptytty)->name args2; }
687
688DEFINE_METHOD(int,pty,(void *ptytty),)
689DEFINE_METHOD(int,tty,(void *ptytty),)
690DEFINE_METHOD(int,get,(void *ptytty),())
691DEFINE_METHOD(void,login,(void *ptytty, int cmd_pid, bool login_shell, const char *hostname),(cmd_pid,login_shell,hostname))
692
693DEFINE_METHOD(void,close_tty,(void *ptytty),())
694DEFINE_METHOD(int,make_controlling_tty,(void *ptytty),())
695DEFINE_METHOD(void,set_utf8_mode,(void *ptytty, int on),(on))
696
697#define DEFINE_STATIC(retval, name, args) \
698extern "C" retval ptytty_ ## name args \
699{ return ptytty::name args; }
700
701DEFINE_STATIC(void,drop_privileges,())
702DEFINE_STATIC(void,use_helper,())
703DEFINE_STATIC(void,init,())
704
705DEFINE_STATIC(void *,create,())
706
707void ptytty_delete (void *ptytty)
708{
709 delete (struct ptytty *)ptytty;
710}
711
712// send_fd, recv_fd not exposed
713
714#endif

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