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Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.18 by root, Sun Dec 12 05:54:05 2004 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 * 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>
7 * Copyright (c) 2004 Marc Lehmann <pcg@goof.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"
29
25#include "rxvt.h" 30#include "ptytty.h"
26 31
27#ifdef HAVE_STDLIB_H
28# include <cstdlib> 32#include <cstdlib>
29#endif 33#include <cstring>
30#ifdef HAVE_SYS_TYPES_H 34
31# include <sys/types.h> 35#include <sys/types.h>
32#endif 36#include <sys/socket.h>
33#ifdef HAVE_UNISTD_H
34# include <unistd.h> 37#include <unistd.h>
35#endif
36#if defined(HAVE_STRING_H)
37# include <cstring>
38#endif
39#ifdef HAVE_FCNTL_H
40# include <fcntl.h> 38#include <fcntl.h>
41#endif 39
42#ifdef HAVE_SYS_IOCTL_H 40#ifdef HAVE_SYS_IOCTL_H
43# include <sys/ioctl.h> 41# include <sys/ioctl.h>
44#endif 42#endif
45#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H) 43#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
46# include <sys/stropts.h> /* for I_PUSH */ 44# include <sys/stropts.h> /* for I_PUSH */
47#endif 45#endif
48#ifdef HAVE_ISASTREAM 46#ifdef HAVE_ISASTREAM
49# include <stropts.h> 47# include <stropts.h>
50#endif 48#endif
51 49#if defined(HAVE_PTY_H)
52// better do this via configure, but.... 50# include <pty.h>
53#if defined(__FreeBSD__) 51#elif defined(HAVE_LIBUTIL_H)
54# include <libutil.h> 52# include <libutil.h>
55#elif defined(__DARWIN__) || (defined (__MACH__) && defined (__APPLE__)) 53#elif defined(HAVE_UTIL_H)
56# include <util.h> 54# include <util.h>
57#endif 55#endif
56#ifdef TTY_GID_SUPPORT
57#include <grp.h>
58#endif
58 59
59#include <cstdio> 60#include <cstdio>
60#include <grp.h> 61
62/////////////////////////////////////////////////////////////////////////////
61 63
62/* ------------------------------------------------------------------------- * 64/* ------------------------------------------------------------------------- *
63 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 65 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
64 * ------------------------------------------------------------------------- */ 66 * ------------------------------------------------------------------------- */
65/* 67/*
66 * Returns pty file descriptor, or -1 on failure 68 * Returns pty file descriptor, or -1 on failure
67 * 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.
68 * 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
69 */ 71 */
72#if defined(UNIX98_PTY)
70static int 73static int
71get_pty (int *fd_tty, char **ttydev) 74get_pty (int *fd_tty, char **ttydev)
72{ 75{
73 int pfd; 76 int pfd;
74 77
75#ifdef PTYS_ARE_OPENPTY 78# if defined(HAVE_GETPT)
76 char tty_name[sizeof "/dev/pts/????\0"]; 79 pfd = getpt();
80# elif defined(HAVE_POSIX_OPENPT)
81 pfd = posix_openpt (O_RDWR);
82# else
83 pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0);
84# 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 }
77 93
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
78 if (openpty (&pfd, fd_tty, tty_name, NULL, NULL) != -1) 107 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
108 if (res != -1)
79 { 109 {
80 *ttydev = strdup (tty_name); 110 *ttydev = strdup (tty_name);
81 return pfd; 111 return pfd;
82 } 112 }
83#endif
84 113
85#ifdef PTYS_ARE__GETPTY 114 return -1;
115}
116#elif defined(HAVE__GETPTY)
117static int
118get_pty (int *fd_tty, char **ttydev)
119{
120 int pfd;
121
86 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 122 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
87 if (*ttydev != NULL) 123 if (*ttydev != NULL)
88 return pfd; 124 return pfd;
89#endif
90 125
91#ifdef PTYS_ARE_GETPTY 126 return -1;
127}
128#elif defined(HAVE_DEV_PTC)
129static int
130get_pty (int *fd_tty, char **ttydev)
131{
132 int pfd;
92 133
93 char *ptydev;
94
95 while ((ptydev = getpty ()) != NULL)
96 if ((pfd = open (ptydev, O_RDWR | O_NOCTTY, 0)) >= 0)
97 {
98 *ttydev = ptydev;
99 return pfd;
100 }
101#endif
102
103#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
104# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX)
105
106 {
107# ifdef PTYS_ARE_GETPT
108 pfd = getpt ();
109# else
110 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
111# endif
112
113 if (pfd >= 0)
114 {
115 if (grantpt (pfd) == 0 /* change slave permissions */
116 && unlockpt (pfd) == 0)
117 { /* slave now unlocked */
118 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
119 return pfd;
120 }
121 close (pfd);
122 }
123 }
124# endif
125#endif
126
127#ifdef PTYS_ARE_PTC
128 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) 134 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
129 { 135 {
130 *ttydev = strdup (ttyname (pfd)); 136 *ttydev = strdup (ttyname (pfd));
131 return pfd; 137 return pfd;
132 } 138 }
133#endif
134 139
135#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
136 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)
137 { 149 {
138 *ttydev = strdup (ptsname (pfd)); 150 *ttydev = strdup (ptsname (pfd));
139 return pfd; 151 return pfd;
140 } 152 }
141#endif
142
143#ifdef PTYS_ARE_NUMERIC
144 {
145 int idx;
146 char *c1, *c2;
147 char pty_name[] = "/dev/ptyp???";
148 char tty_name[] = "/dev/ttyp???";
149
150 c1 = &(pty_name[sizeof (pty_name) - 4]);
151 c2 = &(tty_name[sizeof (tty_name) - 4]);
152 for (idx = 0; idx < 256; idx++)
153 {
154 sprintf (c1, "%d", idx);
155 sprintf (c2, "%d", idx);
156 if (access (tty_name, F_OK) < 0)
157 {
158 idx = 256;
159 break;
160 }
161
162 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
163 {
164 if (access (tty_name, R_OK | W_OK) == 0)
165 {
166 *ttydev = strdup (tty_name);
167 return pfd;
168 }
169
170 close (pfd);
171 }
172 }
173 }
174#endif
175
176#ifdef PTYS_ARE_SEARCHED
177 {
178 const char *c1, *c2;
179 char pty_name[] = "/dev/pty??";
180 char tty_name[] = "/dev/tty??";
181
182# ifndef PTYCHAR1
183# define PTYCHAR1 "pqrstuvwxyz"
184# endif
185# ifndef PTYCHAR2
186# define PTYCHAR2 "0123456789abcdef"
187# endif
188
189 for (c1 = PTYCHAR1; *c1; c1++)
190 {
191 pty_name[ (sizeof (pty_name) - 3)] =
192 tty_name[ (sizeof (pty_name) - 3)] = *c1;
193 for (c2 = PTYCHAR2; *c2; c2++)
194 {
195 pty_name[ (sizeof (pty_name) - 2)] =
196 tty_name[ (sizeof (pty_name) - 2)] = *c2;
197 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
198 {
199 if (access (tty_name, R_OK | W_OK) == 0)
200 {
201 *ttydev = strdup (tty_name);
202 return pfd;
203 }
204
205 close (pfd);
206 }
207 }
208 }
209 }
210#endif
211 153
212 return -1; 154 return -1;
213} 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);
175 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1)
176 continue;
177 }
178 if (access (tty_name, R_OK | W_OK) == 0)
179 {
180 *ttydev = strdup (tty_name);
181 return pfd;
182 }
183
184 close (pfd);
185 }
186}
187#endif
214 188
215/*----------------------------------------------------------------------*/ 189/*----------------------------------------------------------------------*/
216/* 190/*
217 * Returns tty file descriptor, or -1 on failure 191 * Returns tty file descriptor, or -1 on failure
218 */ 192 */
… …
225/*----------------------------------------------------------------------*/ 199/*----------------------------------------------------------------------*/
226/* 200/*
227 * 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
228 */ 202 */
229static int 203static int
230control_tty (int fd_tty, const char *ttydev) 204control_tty (int fd_tty)
231{ 205{
232#ifndef __QNX__
233 int fd;
234
235 /* ---------------------------------------- */
236# ifdef HAVE_SETSID
237 setsid (); 206 setsid ();
238# endif
239# if defined(HAVE_SETPGID)
240 setpgid (0, 0);
241# elif defined(HAVE_SETPGRP)
242 setpgrp (0, 0);
243# endif
244 207
245 /* ---------------------------------------- */
246# ifdef TIOCNOTTY
247 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
248 if (fd >= 0)
249 {
250 ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
251 close (fd);
252 }
253# endif
254
255 /* ---------------------------------------- */
256 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
257 if (fd >= 0)
258 close (fd); /* ouch: still have controlling tty */
259
260 /* ---------------------------------------- */
261#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) 208#if defined(HAVE_DEV_PTMX) && defined(I_PUSH)
262 /* 209 /*
263 * Push STREAMS modules: 210 * Push STREAMS modules:
264 * ptem: pseudo-terminal hardware emulation module. 211 * ptem: pseudo-terminal hardware emulation module.
265 * ldterm: standard terminal line discipline. 212 * ldterm: standard terminal line discipline.
266 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 213 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
… …
283 ioctl (fd_tty, I_PUSH, "ptem"); 230 ioctl (fd_tty, I_PUSH, "ptem");
284 ioctl (fd_tty, I_PUSH, "ldterm"); 231 ioctl (fd_tty, I_PUSH, "ldterm");
285 ioctl (fd_tty, I_PUSH, "ttcompat"); 232 ioctl (fd_tty, I_PUSH, "ttcompat");
286 } 233 }
287#endif 234#endif
288 /* ---------------------------------------- */ 235
289# if defined(TIOCSCTTY)
290 fd = ioctl (fd_tty, TIOCSCTTY, NULL); 236 ioctl (fd_tty, TIOCSCTTY, NULL);
291# elif defined(TIOCSETCTTY) 237
292 fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
293# else
294 fd = open (ttydev, O_RDWR);
295 if (fd >= 0)
296 close (fd);
297# endif
298 /* ---------------------------------------- */
299 fd = open ("/dev/tty", O_WRONLY); 238 int fd = open ("/dev/tty", O_WRONLY);
300 if (fd < 0) 239 if (fd < 0)
301 return -1; /* fatal */ 240 return -1; /* fatal */
241
302 close (fd); 242 close (fd);
303 /* ---------------------------------------- */
304#endif /* ! __QNX__ */
305 243
306 return 0; 244 return 0;
307} 245}
308 246
309#ifndef NO_SETOWNER_TTYDEV 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
310static struct ttyconf { 290static struct ttyconf {
311 gid_t gid; 291 gid_t gid;
312 mode_t mode; 292 mode_t mode;
313 293
314 ttyconf () 294 ttyconf ()
… …
323 } 303 }
324 else 304 else
325#endif /* TTY_GID_SUPPORT */ 305#endif /* TTY_GID_SUPPORT */
326 { 306 {
327 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; 307 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
328 gid = getgid (); 308 gid = 0;
329 } 309 }
330 } 310 }
331} ttyconf; 311} ttyconf;
332 312
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
333void 329void
334rxvt_ptytty::privileges (rxvt_privaction action) 330ptytty_unix::put ()
335{ 331{
336 rxvt_privileges (RESTORE); 332 chmod (name, RESTORE_TTY_MODE);
333 chown (name, 0, ttyconf.gid);
337 334
338 if (action == SAVE) 335 close_tty ();
339 {
340 //next_tty_action = RESTORE;
341# ifndef RESET_TTY_TO_COMMON_DEFAULTS
342 /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
343 if (lstat (name, &savestat) < 0) /* you lose out */
344 ;//next_tty_action = IGNORE;
345 else
346# endif
347 336
348 { 337 if (pty >= 0)
349 chown (name, getuid (), ttyconf.gid); /* fail silently */ 338 close (pty);
350 chmod (name, ttyconf.mode);
351# ifdef HAVE_REVOKE
352 revoke (name);
353# endif
354 339
355 } 340 free (name);
356 }
357 else
358 { /* action == RESTORE */
359 //next_tty_action = IGNORE;
360# ifndef RESET_TTY_TO_COMMON_DEFAULTS
361 chmod (name, savestat.st_mode);
362 chown (name, savestat.st_uid, savestat.st_gid);
363# else
364 chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH));
365 chown (name, 0, 0);
366# endif
367 341
368 }
369
370 rxvt_privileges (IGNORE);
371}
372#endif
373
374rxvt_ptytty::rxvt_ptytty ()
375{
376 pty = tty = -1; 342 pty = tty = -1;
377 name = 0; 343 name = 0;
378} 344}
379 345
380rxvt_ptytty::~rxvt_ptytty ()
381{
382 put ();
383}
384
385void
386
387rxvt_ptytty::close_tty ()
388{
389 if (tty >= 0) close (tty);
390 tty = -1;
391}
392
393void
394rxvt_ptytty::put ()
395{
396#ifndef NO_SETOWNER_TTYDEV
397 if (tty >= 0)
398 privileges (RESTORE);
399#endif
400
401 if (pty >= 0) close (pty);
402 close_tty ();
403 free (name);
404
405 pty = tty = -1;
406 name = 0;
407}
408
409bool 346bool
410rxvt_ptytty::make_controlling_tty () 347ptytty_unix::get ()
411{
412 return control_tty (tty, name) >= 0;
413}
414
415bool
416rxvt_ptytty::get ()
417{ 348{
418 /* get master (pty) */ 349 /* get master (pty) */
419 if ((pty = get_pty (&tty, &name)) < 0) 350 if ((pty = get_pty (&tty, &name)) < 0)
420 return false; 351 return false;
421 352
… …
423 354
424 /* get slave (tty) */ 355 /* get slave (tty) */
425 if (tty < 0) 356 if (tty < 0)
426 { 357 {
427#ifndef NO_SETOWNER_TTYDEV 358#ifndef NO_SETOWNER_TTYDEV
428 privileges (SAVE); 359 chown (name, getuid (), ttyconf.gid); /* fail silently */
360 chmod (name, ttyconf.mode);
361# ifdef HAVE_REVOKE
362 revoke (name);
363# endif
429#endif 364#endif
430 365
431 if ((tty = get_tty (name)) < 0) 366 if ((tty = get_tty (name)) < 0)
432 { 367 {
433 put (); 368 put ();
… …
436 } 371 }
437 372
438 return true; 373 return true;
439} 374}
440 375
441/*----------------------- end-of-file (C source) -----------------------*/ 376#if PTYTTY_HELPER
442 377
378static int sock_fd = -1;
379static int helper_pid, owner_pid;
380
381struct command
382{
383 enum { get, login, destroy } type;
384
385 ptytty *id;
386
387 bool login_shell;
388 int cmd_pid;
389 char hostname[512]; // arbitrary, but should be plenty
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 }
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;
506 }
507
508 // destroy all ptys
509 for (vector<ptytty *>::iterator i = ptys.end (); i-- > ptys.begin (); )
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)
534 {
535 // client, process
536 sock_fd = sv[0];
537 close (sv[1]);
538 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
539 }
540 else
541 {
542 // server, pty-helper
543 sock_fd = sv[1];
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
556#endif
557
558ptytty *
559ptytty::create ()
560{
561#if PTYTTY_HELPER
562 if (helper_pid && getpid () == owner_pid)
563 // use helper process
564 return new ptytty_proxy;
565 else
566#endif
567 return new ptytty_unix;
568}
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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