ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/rxvt-unicode/src/ptytty.C
(Generate patch)

Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.4 by pcg, Tue Dec 2 21:49:46 2003 UTC vs.
Revision 1.44 by ayin, Tue Jan 17 17:59:31 2006 UTC

1/*--------------------------------*-C-*---------------------------------* 1/*--------------------------------*-C-*---------------------------------*
2 * File: ptytty.c 2 * File: ptytty.C
3 *----------------------------------------------------------------------* 3 *----------------------------------------------------------------------*
4 * $Id: ptytty.C,v 1.4 2003/12/02 21:49:46 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>
34#ifdef HAVE_SYS_TYPES_H 29
35# include <sys/types.h> 30#include <sys/types.h>
36#endif 31#include <sys/socket.h>
37#ifdef HAVE_UNISTD_H
38# include <unistd.h> 32#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> 33#include <fcntl.h>
45#endif 34
46#ifdef HAVE_SYS_IOCTL_H 35#ifdef HAVE_SYS_IOCTL_H
47# include <sys/ioctl.h> 36# include <sys/ioctl.h>
48#endif 37#endif
49#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__) 38#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H)
50# include <sys/stropts.h> /* for I_PUSH */ 39# include <sys/stropts.h> /* for I_PUSH */
51#endif 40#endif
52 41#ifdef HAVE_ISASTREAM
53#ifdef DEBUG_TTY 42# include <stropts.h>
54# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr)
55#else
56# define D_TTY(x)
57#endif 43#endif
44#if defined(HAVE_PTY_H)
45# include <pty.h>
46#elif defined(HAVE_LIBUTIL_H)
47# include <libutil.h>
48#elif defined(HAVE_UTIL_H)
49# include <util.h>
50#endif
51
52#include <cstdio>
53#include <grp.h>
54
55#include "rxvtutil.h"
56#include "fdpass.h"
57#include "ptytty.h"
58
59/////////////////////////////////////////////////////////////////////////////
58 60
59/* ------------------------------------------------------------------------- * 61/* ------------------------------------------------------------------------- *
60 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 62 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
61 * ------------------------------------------------------------------------- */ 63 * ------------------------------------------------------------------------- */
62/* 64/*
63 * Returns pty file descriptor, or -1 on failure 65 * Returns pty file descriptor, or -1 on failure
64 * If successful, ttydev is set to the name of the slave device. 66 * If successful, ttydev is set to the name of the slave device.
65 * fd_tty _may_ also be set to an open fd to the slave device 67 * fd_tty _may_ also be set to an open fd to the slave device
66 */ 68 */
67/* EXTPROTO */ 69static inline int
68int
69rxvt_get_pty(int *fd_tty, const char **ttydev) 70get_pty_streams (int *fd_tty, char **ttydev)
70{ 71{
72#ifdef NO_SETOWNER_TTYDEV
71 int pfd; 73 int pfd;
72 74
75# ifdef PTYS_ARE_GETPT
76 pfd = getpt();
77# else
78# ifdef PTYS_ARE_POSIX
79 pfd = posix_openpt (O_RDWR);
80# else
81 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
82# endif
83# 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 }
92 close (pfd);
93 }
94#endif
95 return -1;
96}
97
98static inline int
99get_pty_openpty (int *fd_tty, char **ttydev)
100{
73#ifdef PTYS_ARE_OPENPTY 101#ifdef PTYS_ARE_OPENPTY
74 102 int pfd;
103 int res;
75 char tty_name[sizeof "/dev/pts/????\0"]; 104 char tty_name[sizeof "/dev/pts/????\0"];
76 105
77 if (openpty(&pfd, fd_tty, tty_name, NULL, NULL) != -1) 106 res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
107 if (res != -1)
78 { 108 {
79 *ttydev = strdup(tty_name); 109 *ttydev = strdup (tty_name);
80 return pfd; 110 return pfd;
81 } 111 }
82#endif 112#endif
113 return -1;
114}
83 115
116static inline int
117get_pty__getpty (int *fd_tty, char **ttydev)
118{
84#ifdef PTYS_ARE__GETPTY 119#ifdef PTYS_ARE__GETPTY
120 int pfd;
121
85 *ttydev = _getpty(&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 122 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
86 if (*ttydev != NULL) 123 if (*ttydev != NULL)
87 return pfd; 124 return pfd;
88#endif 125#endif
126 return -1;
127}
89 128
90#ifdef PTYS_ARE_GETPTY 129static inline int
91 130get_pty_ptc (int *fd_tty, char **ttydev)
92 char *ptydev; 131{
93
94 while ((ptydev = getpty()) != NULL)
95 if ((pfd = open(ptydev, O_RDWR | O_NOCTTY, 0)) >= 0)
96 {
97 *ttydev = ptydev;
98 return pfd;
99 }
100#endif
101
102#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
103# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX)
104
105 {
106# ifdef PTYS_ARE_GETPT
107 pfd = getpt();
108# else
109
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 = 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 132#ifdef PTYS_ARE_PTC
133 int pfd;
134
128 if ((pfd = open("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) 135 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
129 { 136 {
130 *ttydev = ttyname(pfd); 137 *ttydev = strdup (ttyname (pfd));
131 return pfd; 138 return pfd;
132 } 139 }
133#endif 140#endif
141 return -1;
142}
134 143
144static inline int
145get_pty_clone (int *fd_tty, char **ttydev)
146{
135#ifdef PTYS_ARE_CLONE 147#ifdef PTYS_ARE_CLONE
148 int pfd;
149
136 if ((pfd = open("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) 150 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
137 { 151 {
138 *ttydev = ptsname(pfd); 152 *ttydev = strdup (ptsname (pfd));
139 return pfd; 153 return pfd;
140 } 154 }
141#endif 155#endif
156 return -1;
157}
142 158
159static inline int
160get_pty_numeric (int *fd_tty, char **ttydev)
161{
143#ifdef PTYS_ARE_NUMERIC 162#ifdef PTYS_ARE_NUMERIC
144 { 163 int pfd;
145 int idx; 164 int idx;
146 char *c1, *c2; 165 char *c1, *c2;
147 char pty_name[] = "/dev/ptyp???"; 166 char pty_name[] = "/dev/ptyp???";
148 char tty_name[] = "/dev/ttyp???"; 167 char tty_name[] = "/dev/ttyp???";
149 168
150 c1 = &(pty_name[sizeof(pty_name) - 4]); 169 c1 = &(pty_name[sizeof (pty_name) - 4]);
151 c2 = &(tty_name[sizeof(tty_name) - 4]); 170 c2 = &(tty_name[sizeof (tty_name) - 4]);
152 for (idx = 0; idx < 256; idx++) 171 for (idx = 0; idx < 256; idx++)
153 { 172 {
154 sprintf(c1, "%d", idx); 173 sprintf (c1, "%d", idx);
155 sprintf(c2, "%d", idx); 174 sprintf (c2, "%d", idx);
156 if (access(tty_name, F_OK) < 0) 175 if (access (tty_name, F_OK) < 0)
157 { 176 {
158 idx = 256; 177 idx = 256;
159 break; 178 break;
160 } 179 }
180
161 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) 181 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
162 { 182 {
163 if (access(tty_name, R_OK | W_OK) == 0) 183 if (access (tty_name, R_OK | W_OK) == 0)
164 { 184 {
165 *ttydev = strdup(tty_name); 185 *ttydev = strdup (tty_name);
166 return pfd; 186 return pfd;
167 } 187 }
188
168 close(pfd); 189 close (pfd);
169 } 190 }
170 } 191 }
171 }
172#endif 192#endif
193 return -1;
194}
195
196static inline int
197get_pty_searched (int *fd_tty, char **ttydev)
198{
173#ifdef PTYS_ARE_SEARCHED 199#ifdef PTYS_ARE_SEARCHED
174 {
175 const char *c1, *c2;
176 char pty_name[] = "/dev/pty??";
177 char tty_name[] = "/dev/tty??";
178
179# ifndef PTYCHAR1 200# ifndef PTYCHAR1
180# define PTYCHAR1 "pqrstuvwxyz" 201# define PTYCHAR1 "pqrstuvwxyz"
181# endif 202# endif
182# ifndef PTYCHAR2 203# ifndef PTYCHAR2
183# define PTYCHAR2 "0123456789abcdef" 204# define PTYCHAR2 "0123456789abcdef"
184# endif 205# endif
206 int pfd;
207 const char *c1, *c2;
208 char pty_name[] = "/dev/pty??";
209 char tty_name[] = "/dev/tty??";
185 210
186 for (c1 = PTYCHAR1; *c1; c1++) 211 for (c1 = PTYCHAR1; *c1; c1++)
187 { 212 {
188 pty_name[(sizeof(pty_name) - 3)] = 213 pty_name[ (sizeof (pty_name) - 3)] =
189 tty_name[(sizeof(pty_name) - 3)] = *c1; 214 tty_name[ (sizeof (pty_name) - 3)] = *c1;
190 for (c2 = PTYCHAR2; *c2; c2++) 215 for (c2 = PTYCHAR2; *c2; c2++)
191 { 216 {
192 pty_name[(sizeof(pty_name) - 2)] = 217 pty_name[ (sizeof (pty_name) - 2)] =
193 tty_name[(sizeof(pty_name) - 2)] = *c2; 218 tty_name[ (sizeof (pty_name) - 2)] = *c2;
194 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) 219 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
195 { 220 {
196 if (access(tty_name, R_OK | W_OK) == 0) 221 if (access (tty_name, R_OK | W_OK) == 0)
197 { 222 {
198 *ttydev = strdup(tty_name); 223 *ttydev = strdup (tty_name);
199 return pfd; 224 return pfd;
200 } 225 }
226
201 close(pfd); 227 close (pfd);
202 } 228 }
203 } 229 }
204 } 230 }
205 }
206#endif 231#endif
232 return -1;
233}
234
235static int
236get_pty (int *fd_tty, char **ttydev)
237{
238 int pfd;
239
240 if ((pfd = get_pty_streams (fd_tty, ttydev)) != -1
241 || (pfd = get_pty_openpty (fd_tty, ttydev)) != -1
242 || (pfd = get_pty__getpty (fd_tty, ttydev)) != -1
243 || (pfd = get_pty_ptc (fd_tty, ttydev)) != -1
244 || (pfd = get_pty_clone (fd_tty, ttydev)) != -1
245 || (pfd = get_pty_numeric (fd_tty, ttydev)) != -1
246 || (pfd = get_pty_searched (fd_tty, ttydev)) != -1)
247 return pfd;
207 return -1; 248 return -1;
208} 249}
209 250
210/*----------------------------------------------------------------------*/ 251/*----------------------------------------------------------------------*/
211/* 252/*
212 * Returns tty file descriptor, or -1 on failure 253 * Returns tty file descriptor, or -1 on failure
213 */ 254 */
214/* EXTPROTO */ 255static int
215int
216rxvt_get_tty (const char *ttydev) 256get_tty (char *ttydev)
217{ 257{
218 return open (ttydev, O_RDWR | O_NOCTTY, 0); 258 return open (ttydev, O_RDWR | O_NOCTTY, 0);
219} 259}
220 260
221/*----------------------------------------------------------------------*/ 261/*----------------------------------------------------------------------*/
222/* 262/*
223 * Make our tty a controlling tty so that /dev/tty points to us 263 * Make our tty a controlling tty so that /dev/tty points to us
224 */ 264 */
225/* EXTPROTO */ 265static int
226int 266control_tty (int fd_tty)
227rxvt_control_tty (int fd_tty, const char *ttydev)
228{ 267{
229#ifndef __QNX__
230 int fd; 268 int fd;
231 269
232 D_TTY ((stderr, "rxvt_control_tty(): pid: %d, tty fd: %d, dev: %s", getpid(), fd_tty, ttydev));
233 /* ---------------------------------------- */ 270 /* ---------------------------------------- */
234# ifdef HAVE_SETSID
235 setsid (); 271 setsid ();
236# endif 272
237# if defined(HAVE_SETPGID)
238 setpgid (0, 0);
239# elif defined(HAVE_SETPGRP)
240 setpgrp (0, 0);
241# endif
242 /* ---------------------------------------- */ 273 /* ---------------------------------------- */
243# ifdef TIOCNOTTY
244
245 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
246 D_TTY ((stderr, "rxvt_control_tty(): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
247 if (fd >= 0)
248 {
249 ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
250 close (fd);
251 }
252# endif
253 /* ---------------------------------------- */
254 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
255 D_TTY ((stderr, "rxvt_control_tty(): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
256 if (fd >= 0)
257 close (fd); /* ouch: still have controlling tty */
258 /* ---------------------------------------- */
259#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) 274# if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
260 /* 275 /*
261 * Push STREAMS modules: 276 * Push STREAMS modules:
262 * ptem: pseudo-terminal hardware emulation module. 277 * ptem: pseudo-terminal hardware emulation module.
263 * ldterm: standard terminal line discipline. 278 * ldterm: standard terminal line discipline.
264 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 279 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
265 * 280 *
266 * After we push the STREAMS modules, the first open() on the slave side 281 * After we push the STREAMS modules, the first open () on the slave side
267 * (i.e. the next section between the dashes giving us "tty opened OK") 282 * (i.e. the next section between the dashes giving us "tty opened OK")
268 * should make the "ptem" (or "ldterm" depending upon either which OS 283 * should make the "ptem" (or "ldterm" depending upon either which OS
269 * version or which set of manual pages you have) module give us a 284 * version or which set of manual pages you have) module give us a
270 * controlling terminal. We must already have close()d the master side 285 * controlling terminal. We must already have close ()d the master side
271 * fd in this child process before we push STREAMS modules on because the 286 * fd in this child process before we push STREAMS modules on because the
272 * documentation is really unclear about whether it is any close() on 287 * documentation is really unclear about whether it is any close () on
273 * the master side or the last close() - i.e. a proper STREAMS dismantling 288 * the master side or the last close () - i.e. a proper STREAMS dismantling
274 * close() - on the master side which causes a hang up to be sent 289 * close () - on the master side which causes a hang up to be sent
275 * through - Geoff Wing 290 * through - Geoff Wing
276 */ 291 */
277# ifdef HAVE_ISASTREAM 292# ifdef HAVE_ISASTREAM
278 if (isastream (fd_tty) == 1) 293 if (isastream (fd_tty) == 1)
279# endif 294# endif
280 { 295 {
281 D_TTY ((stderr, "rxvt_control_tty(): Pushing STREAMS modules"));
282 ioctl (fd_tty, I_PUSH, "ptem"); 296 ioctl (fd_tty, I_PUSH, "ptem");
283 ioctl (fd_tty, I_PUSH, "ldterm"); 297 ioctl (fd_tty, I_PUSH, "ldterm");
284 ioctl (fd_tty, I_PUSH, "ttcompat"); 298 ioctl (fd_tty, I_PUSH, "ttcompat");
285 } 299 }
286#endif 300# endif
287 /* ---------------------------------------- */ 301 /* ---------------------------------------- */
288# if defined(TIOCSCTTY)
289 fd = ioctl (fd_tty, TIOCSCTTY, NULL); 302 fd = ioctl (fd_tty, TIOCSCTTY, NULL);
290 D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSCTTY): %d", fd));
291# elif defined(TIOCSETCTTY)
292 fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
293 D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSETCTTY): %d", fd));
294# else
295 fd = open (ttydev, O_RDWR);
296 D_TTY ((stderr, "rxvt_control_tty(): tty open%s", fd < 0 ? " failure" : "ed OK"));
297 if (fd >= 0)
298 close(fd);
299# endif
300 /* ---------------------------------------- */ 303 /* ---------------------------------------- */
301 fd = open ("/dev/tty", O_WRONLY); 304 fd = open ("/dev/tty", O_WRONLY);
302 D_TTY ((stderr, "rxvt_control_tty(): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
303 if (fd < 0) 305 if (fd < 0)
304 return -1; /* fatal */ 306 return -1; /* fatal */
305 close (fd); 307 close (fd);
306 /* ---------------------------------------- */ 308 /* ---------------------------------------- */
307 D_TTY ((stderr, "rxvt_control_tty(): tcgetpgrp(): %d getpgrp(): %d", tcgetpgrp(fd_tty), getpgrp()));
308 /* ---------------------------------------- */
309#endif /* ! __QNX__ */
310 309
311 return 0; 310 return 0;
312} 311}
312
313void
314rxvt_ptytty::close_tty ()
315{
316 if (tty < 0)
317 return;
318
319 close (tty);
320 tty = -1;
321}
322
323bool
324rxvt_ptytty::make_controlling_tty ()
325{
326 return control_tty (tty) >= 0;
327}
328
329void
330rxvt_ptytty::set_utf8_mode (bool on)
331{
332#ifdef IUTF8
333 if (pty < 0)
334 return;
335
336 struct termios tio;
337
338 if (tcgetattr (pty, &tio) != -1)
339 {
340 tcflag_t new_cflag = tio.c_iflag;
341
342 if (on)
343 new_cflag |= IUTF8;
344 else
345 new_cflag &= ~IUTF8;
346
347 if (new_cflag != tio.c_iflag)
348 {
349 tio.c_iflag = new_cflag;
350 tcsetattr (pty, TCSANOW, &tio);
351 }
352 }
353#endif
354}
355
356/////////////////////////////////////////////////////////////////////////////
357
358#ifndef NO_SETOWNER_TTYDEV
359static struct ttyconf {
360 gid_t gid;
361 mode_t mode;
362
363 ttyconf ()
364 {
365#ifdef TTY_GID_SUPPORT
366 struct group *gr = getgrnam ("tty");
367
368 if (gr)
369 { /* change group ownership of tty to "tty" */
370 mode = S_IRUSR | S_IWUSR | S_IWGRP;
371 gid = gr->gr_gid;
372 }
373 else
374#endif /* TTY_GID_SUPPORT */
375 {
376 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
377 gid = getgid ();
378 }
379 }
380} ttyconf;
381
382/////////////////////////////////////////////////////////////////////////////
383
384void
385rxvt_ptytty_unix::privileges (rxvt_privaction action)
386{
387 if (!name || !*name)
388 return;
389
390 if (action == SAVE)
391 {
392# ifndef RESET_TTY_TO_COMMON_DEFAULTS
393 /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
394 if (lstat (name, &savestat) < 0) /* you lose out */
395 ;
396 else
397# endif
398 {
399 saved = true;
400 chown (name, getuid (), ttyconf.gid); /* fail silently */
401 chmod (name, ttyconf.mode);
402# ifdef HAVE_REVOKE
403 revoke (name);
404# endif
405 }
406 }
407 else
408 { /* action == RESTORE */
409# ifndef RESET_TTY_TO_COMMON_DEFAULTS
410 if (saved)
411 {
412 chmod (name, savestat.st_mode);
413 chown (name, savestat.st_uid, savestat.st_gid);
414 }
415# else
416 chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH));
417 chown (name, 0, 0);
418# endif
419
420 }
421}
422#endif
423
424rxvt_ptytty_unix::rxvt_ptytty_unix ()
425{
426 pty = tty = -1;
427 name = 0;
428#ifndef NO_SETOWNER_TTYDEV
429 saved = false;
430#endif
431#if UTMP_SUPPORT
432 cmd_pid = 0;
433#endif
434}
435
436rxvt_ptytty_unix::~rxvt_ptytty_unix ()
437{
438#if UTMP_SUPPORT
439 logout ();
440#endif
441 put ();
442}
443
444void
445rxvt_ptytty_unix::put ()
446{
447#ifndef NO_SETOWNER_TTYDEV
448 privileges (RESTORE);
449#endif
450
451 if (pty >= 0) close (pty);
452 close_tty ();
453 free (name);
454
455 pty = tty = -1;
456 name = 0;
457}
458
459bool
460rxvt_ptytty_unix::get ()
461{
462 /* get master (pty) */
463 if ((pty = get_pty (&tty, &name)) < 0)
464 return false;
465
466 fcntl (pty, F_SETFL, O_NONBLOCK);
467
468 /* get slave (tty) */
469 if (tty < 0)
470 {
471#ifndef NO_SETOWNER_TTYDEV
472 privileges (SAVE);
473#endif
474
475 if ((tty = get_tty (name)) < 0)
476 {
477 put ();
478 return false;
479 }
480 }
481
482 return true;
483}
484
485#if PTYTTY_HELPER
486
487static int sock_fd;
488static int pid;
489
490struct command
491{
492 enum { get, login, destroy } type;
493
494 rxvt_ptytty *id;
495
496 bool login_shell;
497 int cmd_pid;
498 char hostname[512]; // arbitrary, but should be plenty
499};
500
501struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty
502{
503 rxvt_ptytty *id;
504
505 ~rxvt_ptytty_proxy ();
506
507 bool get ();
508 void login (int cmd_pid, bool login_shell, const char *hostname);
509};
510
511bool
512rxvt_ptytty_proxy::get ()
513{
514 command cmd;
515
516 cmd.type = command::get;
517
518 write (sock_fd, &cmd, sizeof (cmd));
519
520 if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
521 rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n");
522
523 if (!id)
524 return false;
525
526 if ((pty = rxvt_recv_fd (sock_fd)) < 0
527 || (tty = rxvt_recv_fd (sock_fd)) < 0)
528 rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
529
530 return true;
531}
532
533void
534rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
535{
536 command cmd;
537
538 cmd.type = command::login;
539 cmd.id = id;
540 cmd.cmd_pid = cmd_pid;
541 cmd.login_shell = login_shell;
542 strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
543
544 write (sock_fd, &cmd, sizeof (cmd));
545}
546
547rxvt_ptytty_proxy::~rxvt_ptytty_proxy ()
548{
549 command cmd;
550
551 cmd.type = command::destroy;
552 cmd.id = id;
553
554 write (sock_fd, &cmd, sizeof (cmd));
555}
556
557static
558void serve ()
559{
560 command cmd;
561 vector<rxvt_ptytty *> ptys;
562
563 while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
564 {
565 if (cmd.type == command::get)
566 {
567 // -> id ptyfd ttyfd
568 cmd.id = new rxvt_ptytty_unix;
569
570 if (cmd.id->get ())
571 {
572 write (sock_fd, &cmd.id, sizeof (cmd.id));
573 ptys.push_back (cmd.id);
574
575 rxvt_send_fd (sock_fd, cmd.id->pty);
576 rxvt_send_fd (sock_fd, cmd.id->tty);
577 }
578 else
579 {
580 delete cmd.id;
581 cmd.id = 0;
582 write (sock_fd, &cmd.id, sizeof (cmd.id));
583 }
584 }
585 else if (cmd.type == command::login)
586 {
587#if UTMP_SUPPORT
588 if (find (ptys.begin (), ptys.end (), cmd.id))
589 {
590 cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
591 cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
592 }
593#endif
594 }
595 else if (cmd.type == command::destroy)
596 {
597 rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);
598
599 if (pty)
600 {
601 delete *pty;
602 ptys.erase (pty);
603 }
604 }
605 else
606 break;
607 }
608
609 // destroy all ptys
610 for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); )
611 delete *i;
612}
613
614void rxvt_ptytty_server ()
615{
616 int sv[2];
617
618 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
619 rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
620
621 pid = fork ();
622
623 if (pid < 0)
624 rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n");
625
626 if (pid)
627 {
628 // client, urxvt
629 sock_fd = sv[0];
630 close (sv[1]);
631 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
632 }
633 else
634 {
635 setgid (getegid ());
636 setuid (geteuid ());
637
638 // server, pty-helper
639 sock_fd = sv[1];
640
641 for (int fd = 0; fd < 1023; fd++)
642 if (fd != sock_fd && fd != 1)
643 close (fd);
644
645 serve ();
646 _exit (EXIT_SUCCESS);
647 }
648}
649#endif
650
651// a "factory" *g*
652rxvt_ptytty *
653rxvt_new_ptytty ()
654{
655#if PTYTTY_HELPER
656 if (pid > 0)
657 // use helper process
658 return new rxvt_ptytty_proxy;
659 else
660#endif
661 return new rxvt_ptytty_unix;
662}
663
313/*----------------------- end-of-file (C source) -----------------------*/ 664/*----------------------- end-of-file (C source) -----------------------*/
665

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines