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Comparing rxvt-unicode/src/ptytty.C (file contents):
Revision 1.5 by pcg, Sat Jan 31 03:27:45 2004 UTC vs.
Revision 1.43 by root, Tue Jan 17 16:50:42 2006 UTC

1/*--------------------------------*-C-*---------------------------------* 1/*--------------------------------*-C-*---------------------------------*
2 * File: ptytty.c 2 * File: ptytty.C
3 *----------------------------------------------------------------------* 3 *----------------------------------------------------------------------*
4 * 4 *
5 * All portions of code are copyright by their respective author/s. 5 * All portions of code are copyright by their respective author/s.
6 * 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>
7 * 8 *
8 * 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
9 * 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
10 * the Free Software Foundation; either version 2 of the License, or 11 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version. 12 * (at your option) any later version.
… …
19 * along with this program; if not, write to the Free Software 20 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *---------------------------------------------------------------------*/ 22 *---------------------------------------------------------------------*/
22 23
23#include "../config.h" /* NECESSARY */ 24#include "../config.h" /* NECESSARY */
25#include "rxvt.h"
24 26
25/*
26 * Try to be self-contained except for the above autoconfig'd defines
27 */
28
29#include <stdio.h>
30#ifdef HAVE_STDLIB_H
31# include <stdlib.h> 27#include <cstdlib>
32#endif 28#include <cstring>
33#ifdef HAVE_SYS_TYPES_H 29
34# include <sys/types.h> 30#include <sys/types.h>
35#endif 31#include <sys/socket.h>
36#ifdef HAVE_UNISTD_H
37# include <unistd.h> 32#include <unistd.h>
38#endif
39#if defined(HAVE_STRING_H)
40# include <string.h>
41#endif
42#ifdef HAVE_FCNTL_H
43# include <fcntl.h> 33#include <fcntl.h>
44#endif 34
45#ifdef HAVE_SYS_IOCTL_H 35#ifdef HAVE_SYS_IOCTL_H
46# include <sys/ioctl.h> 36# include <sys/ioctl.h>
47#endif 37#endif
48#if defined(PTYS_ARE_PTMX) && !defined(__CYGWIN32__) 38#if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H)
49# include <sys/stropts.h> /* for I_PUSH */ 39# include <sys/stropts.h> /* for I_PUSH */
50#endif 40#endif
51 41#ifdef HAVE_ISASTREAM
52#ifdef DEBUG_TTY 42# include <stropts.h>
53# define D_TTY(x) fprintf x ; fputc('\n', stderr) ; fflush(stderr)
54#else
55# define D_TTY(x)
56#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/////////////////////////////////////////////////////////////////////////////
57 60
58/* ------------------------------------------------------------------------- * 61/* ------------------------------------------------------------------------- *
59 * GET PSEUDO TELETYPE - MASTER AND SLAVE * 62 * GET PSEUDO TELETYPE - MASTER AND SLAVE *
60 * ------------------------------------------------------------------------- */ 63 * ------------------------------------------------------------------------- */
61/* 64/*
62 * Returns pty file descriptor, or -1 on failure 65 * Returns pty file descriptor, or -1 on failure
63 * 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.
64 * 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
65 */ 68 */
66/* EXTPROTO */ 69static int
67int
68rxvt_get_pty(int *fd_tty, const char **ttydev) 70get_pty (int *fd_tty, char **ttydev)
69{ 71{
70 int pfd; 72 int pfd;
71 73
72#ifdef PTYS_ARE_OPENPTY 74#ifdef PTYS_ARE_OPENPTY
73
74 char tty_name[sizeof "/dev/pts/????\0"]; 75 char tty_name[sizeof "/dev/pts/????\0"];
75 76
76 if (openpty(&pfd, fd_tty, tty_name, NULL, NULL) != -1) 77 int res = openpty (&pfd, fd_tty, tty_name, NULL, NULL);
78
79 if (res != -1)
77 { 80 {
78 *ttydev = strdup(tty_name); 81 *ttydev = strdup (tty_name);
79 return pfd; 82 return pfd;
80 } 83 }
81#endif 84#endif
82 85
83#ifdef PTYS_ARE__GETPTY 86#ifdef PTYS_ARE__GETPTY
84 *ttydev = _getpty(&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); 87 *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0);
85 if (*ttydev != NULL) 88 if (*ttydev != NULL)
86 return pfd; 89 return pfd;
87#endif 90#endif
88 91
89#ifdef PTYS_ARE_GETPTY
90
91 char *ptydev;
92
93 while ((ptydev = getpty()) != NULL)
94 if ((pfd = open(ptydev, O_RDWR | O_NOCTTY, 0)) >= 0)
95 {
96 *ttydev = ptydev;
97 return pfd;
98 }
99#endif
100
101#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) 92#if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT)
102# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_PTMX) 93# if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_POSIX) || defined(PTYS_ARE_PTMX)
103 94
104 { 95 {
105# ifdef PTYS_ARE_GETPT 96# ifdef PTYS_ARE_GETPT
106 pfd = getpt(); 97 pfd = getpt();
107# else 98# else
108 99# ifdef PTYS_ARE_POSIX
100 pfd = posix_openpt (O_RDWR);
101# else
109 pfd = open("/dev/ptmx", O_RDWR | O_NOCTTY, 0); 102 pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0);
103# endif
110# endif 104# endif
111 105
112 if (pfd >= 0) 106 if (pfd >= 0)
113 { 107 {
114 if (grantpt(pfd) == 0 /* change slave permissions */ 108 if (grantpt (pfd) == 0 /* change slave permissions */
115 && unlockpt(pfd) == 0) 109 && unlockpt (pfd) == 0)
116 { /* slave now unlocked */ 110 { /* slave now unlocked */
117 *ttydev = ptsname(pfd); /* get slave's name */ 111 *ttydev = strdup (ptsname (pfd)); /* get slave's name */
118 return pfd; 112 return pfd;
119 } 113 }
120 close(pfd); 114 close (pfd);
121 } 115 }
122 } 116 }
123# endif 117# endif
124#endif 118#endif
125 119
126#ifdef PTYS_ARE_PTC 120#ifdef PTYS_ARE_PTC
127 if ((pfd = open("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) 121 if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0)
128 { 122 {
129 *ttydev = ttyname(pfd); 123 *ttydev = strdup (ttyname (pfd));
130 return pfd; 124 return pfd;
131 } 125 }
132#endif 126#endif
133 127
134#ifdef PTYS_ARE_CLONE 128#ifdef PTYS_ARE_CLONE
135 if ((pfd = open("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) 129 if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0)
136 { 130 {
137 *ttydev = ptsname(pfd); 131 *ttydev = strdup (ptsname (pfd));
138 return pfd; 132 return pfd;
139 } 133 }
140#endif 134#endif
141 135
142#ifdef PTYS_ARE_NUMERIC 136#ifdef PTYS_ARE_NUMERIC
143 { 137 {
144 int idx; 138 int idx;
145 char *c1, *c2; 139 char *c1, *c2;
146 char pty_name[] = "/dev/ptyp???"; 140 char pty_name[] = "/dev/ptyp???";
147 char tty_name[] = "/dev/ttyp???"; 141 char tty_name[] = "/dev/ttyp???";
148 142
149 c1 = &(pty_name[sizeof(pty_name) - 4]); 143 c1 = &(pty_name[sizeof (pty_name) - 4]);
150 c2 = &(tty_name[sizeof(tty_name) - 4]); 144 c2 = &(tty_name[sizeof (tty_name) - 4]);
151 for (idx = 0; idx < 256; idx++) 145 for (idx = 0; idx < 256; idx++)
152 { 146 {
153 sprintf(c1, "%d", idx); 147 sprintf (c1, "%d", idx);
154 sprintf(c2, "%d", idx); 148 sprintf (c2, "%d", idx);
155 if (access(tty_name, F_OK) < 0) 149 if (access (tty_name, F_OK) < 0)
156 { 150 {
157 idx = 256; 151 idx = 256;
158 break; 152 break;
159 } 153 }
154
160 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) 155 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
161 { 156 {
162 if (access(tty_name, R_OK | W_OK) == 0) 157 if (access (tty_name, R_OK | W_OK) == 0)
163 { 158 {
164 *ttydev = strdup(tty_name); 159 *ttydev = strdup (tty_name);
165 return pfd; 160 return pfd;
166 } 161 }
162
167 close(pfd); 163 close (pfd);
168 } 164 }
169 } 165 }
170 } 166 }
171#endif 167#endif
168
172#ifdef PTYS_ARE_SEARCHED 169#ifdef PTYS_ARE_SEARCHED
173 { 170 {
174 const char *c1, *c2; 171 const char *c1, *c2;
175 char pty_name[] = "/dev/pty??"; 172 char pty_name[] = "/dev/pty??";
176 char tty_name[] = "/dev/tty??"; 173 char tty_name[] = "/dev/tty??";
177 174
178# ifndef PTYCHAR1 175# ifndef PTYCHAR1
179# define PTYCHAR1 "pqrstuvwxyz" 176# define PTYCHAR1 "pqrstuvwxyz"
180# endif 177# endif
181# ifndef PTYCHAR2 178# ifndef PTYCHAR2
182# define PTYCHAR2 "0123456789abcdef" 179# define PTYCHAR2 "0123456789abcdef"
183# endif 180# endif
184 181
185 for (c1 = PTYCHAR1; *c1; c1++) 182 for (c1 = PTYCHAR1; *c1; c1++)
186 { 183 {
187 pty_name[(sizeof(pty_name) - 3)] = 184 pty_name[ (sizeof (pty_name) - 3)] =
188 tty_name[(sizeof(pty_name) - 3)] = *c1; 185 tty_name[ (sizeof (pty_name) - 3)] = *c1;
189 for (c2 = PTYCHAR2; *c2; c2++) 186 for (c2 = PTYCHAR2; *c2; c2++)
190 { 187 {
191 pty_name[(sizeof(pty_name) - 2)] = 188 pty_name[ (sizeof (pty_name) - 2)] =
192 tty_name[(sizeof(pty_name) - 2)] = *c2; 189 tty_name[ (sizeof (pty_name) - 2)] = *c2;
193 if ((pfd = open(pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) 190 if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0)
194 { 191 {
195 if (access(tty_name, R_OK | W_OK) == 0) 192 if (access (tty_name, R_OK | W_OK) == 0)
196 { 193 {
197 *ttydev = strdup(tty_name); 194 *ttydev = strdup (tty_name);
198 return pfd; 195 return pfd;
199 } 196 }
197
200 close(pfd); 198 close (pfd);
201 } 199 }
202 } 200 }
203 } 201 }
204 } 202 }
205#endif 203#endif
204
206 return -1; 205 return -1;
207} 206}
208 207
209/*----------------------------------------------------------------------*/ 208/*----------------------------------------------------------------------*/
210/* 209/*
211 * Returns tty file descriptor, or -1 on failure 210 * Returns tty file descriptor, or -1 on failure
212 */ 211 */
213/* EXTPROTO */ 212static int
214int
215rxvt_get_tty (const char *ttydev) 213get_tty (char *ttydev)
216{ 214{
217 return open (ttydev, O_RDWR | O_NOCTTY, 0); 215 return open (ttydev, O_RDWR | O_NOCTTY, 0);
218} 216}
219 217
220/*----------------------------------------------------------------------*/ 218/*----------------------------------------------------------------------*/
221/* 219/*
222 * Make our tty a controlling tty so that /dev/tty points to us 220 * Make our tty a controlling tty so that /dev/tty points to us
223 */ 221 */
224/* EXTPROTO */ 222static int
225int 223control_tty (int fd_tty)
226rxvt_control_tty (int fd_tty, const char *ttydev)
227{ 224{
228#ifndef __QNX__
229 int fd; 225 int fd;
230 226
231 D_TTY ((stderr, "rxvt_control_tty(): pid: %d, tty fd: %d, dev: %s", getpid(), fd_tty, ttydev));
232 /* ---------------------------------------- */ 227 /* ---------------------------------------- */
233# ifdef HAVE_SETSID
234 setsid (); 228 setsid ();
235# endif 229
236# if defined(HAVE_SETPGID)
237 setpgid (0, 0);
238# elif defined(HAVE_SETPGRP)
239 setpgrp (0, 0);
240# endif
241 /* ---------------------------------------- */ 230 /* ---------------------------------------- */
242# ifdef TIOCNOTTY
243
244 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
245 D_TTY ((stderr, "rxvt_control_tty(): Voiding tty associations: previous=%s", fd < 0 ? "no" : "yes"));
246 if (fd >= 0)
247 {
248 ioctl (fd, TIOCNOTTY, NULL); /* void tty associations */
249 close (fd);
250 }
251# endif
252 /* ---------------------------------------- */
253 fd = open ("/dev/tty", O_RDWR | O_NOCTTY);
254 D_TTY ((stderr, "rxvt_control_tty(): /dev/tty has controlling tty? %s", fd < 0 ? "no (good)" : "yes (bad)"));
255 if (fd >= 0)
256 close (fd); /* ouch: still have controlling tty */
257 /* ---------------------------------------- */
258#if defined(PTYS_ARE_PTMX) && defined(I_PUSH) 231# if defined(PTYS_ARE_PTMX) && defined(I_PUSH)
259 /* 232 /*
260 * Push STREAMS modules: 233 * Push STREAMS modules:
261 * ptem: pseudo-terminal hardware emulation module. 234 * ptem: pseudo-terminal hardware emulation module.
262 * ldterm: standard terminal line discipline. 235 * ldterm: standard terminal line discipline.
263 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. 236 * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module.
264 * 237 *
265 * After we push the STREAMS modules, the first open() on the slave side 238 * After we push the STREAMS modules, the first open () on the slave side
266 * (i.e. the next section between the dashes giving us "tty opened OK") 239 * (i.e. the next section between the dashes giving us "tty opened OK")
267 * should make the "ptem" (or "ldterm" depending upon either which OS 240 * should make the "ptem" (or "ldterm" depending upon either which OS
268 * version or which set of manual pages you have) module give us a 241 * version or which set of manual pages you have) module give us a
269 * controlling terminal. We must already have close()d the master side 242 * controlling terminal. We must already have close ()d the master side
270 * fd in this child process before we push STREAMS modules on because the 243 * fd in this child process before we push STREAMS modules on because the
271 * documentation is really unclear about whether it is any close() on 244 * documentation is really unclear about whether it is any close () on
272 * the master side or the last close() - i.e. a proper STREAMS dismantling 245 * the master side or the last close () - i.e. a proper STREAMS dismantling
273 * close() - on the master side which causes a hang up to be sent 246 * close () - on the master side which causes a hang up to be sent
274 * through - Geoff Wing 247 * through - Geoff Wing
275 */ 248 */
276# ifdef HAVE_ISASTREAM 249# ifdef HAVE_ISASTREAM
277 if (isastream (fd_tty) == 1) 250 if (isastream (fd_tty) == 1)
278# endif 251# endif
279 { 252 {
280 D_TTY ((stderr, "rxvt_control_tty(): Pushing STREAMS modules"));
281 ioctl (fd_tty, I_PUSH, "ptem"); 253 ioctl (fd_tty, I_PUSH, "ptem");
282 ioctl (fd_tty, I_PUSH, "ldterm"); 254 ioctl (fd_tty, I_PUSH, "ldterm");
283 ioctl (fd_tty, I_PUSH, "ttcompat"); 255 ioctl (fd_tty, I_PUSH, "ttcompat");
284 } 256 }
285#endif
286 /* ---------------------------------------- */
287# if defined(TIOCSCTTY)
288 fd = ioctl (fd_tty, TIOCSCTTY, NULL);
289 D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSCTTY): %d", fd));
290# elif defined(TIOCSETCTTY)
291 fd = ioctl (fd_tty, TIOCSETCTTY, NULL);
292 D_TTY ((stderr, "rxvt_control_tty(): ioctl(..,TIOCSETCTTY): %d", fd));
293# else
294 fd = open (ttydev, O_RDWR);
295 D_TTY ((stderr, "rxvt_control_tty(): tty open%s", fd < 0 ? " failure" : "ed OK"));
296 if (fd >= 0)
297 close(fd);
298# endif 257# endif
299 /* ---------------------------------------- */ 258 /* ---------------------------------------- */
259 fd = ioctl (fd_tty, TIOCSCTTY, NULL);
260 /* ---------------------------------------- */
300 fd = open ("/dev/tty", O_WRONLY); 261 fd = open ("/dev/tty", O_WRONLY);
301 D_TTY ((stderr, "rxvt_control_tty(): do we have controlling tty now: %s", fd < 0 ? "no (fatal)" : "yes (good)"));
302 if (fd < 0) 262 if (fd < 0)
303 return -1; /* fatal */ 263 return -1; /* fatal */
304 close (fd); 264 close (fd);
305 /* ---------------------------------------- */ 265 /* ---------------------------------------- */
306 D_TTY ((stderr, "rxvt_control_tty(): tcgetpgrp(): %d getpgrp(): %d", tcgetpgrp(fd_tty), getpgrp()));
307 /* ---------------------------------------- */
308#endif /* ! __QNX__ */
309 266
310 return 0; 267 return 0;
311} 268}
269
270void
271rxvt_ptytty::close_tty ()
272{
273 if (tty < 0)
274 return;
275
276 close (tty);
277 tty = -1;
278}
279
280bool
281rxvt_ptytty::make_controlling_tty ()
282{
283 return control_tty (tty) >= 0;
284}
285
286void
287rxvt_ptytty::set_utf8_mode (bool on)
288{
289#ifdef IUTF8
290 if (pty < 0)
291 return;
292
293 struct termios tio;
294
295 if (tcgetattr (pty, &tio) != -1)
296 {
297 tcflag_t new_cflag = tio.c_iflag;
298
299 if (on)
300 new_cflag |= IUTF8;
301 else
302 new_cflag &= ~IUTF8;
303
304 if (new_cflag != tio.c_iflag)
305 {
306 tio.c_iflag = new_cflag;
307 tcsetattr (pty, TCSANOW, &tio);
308 }
309 }
310#endif
311}
312
313/////////////////////////////////////////////////////////////////////////////
314
315#ifndef NO_SETOWNER_TTYDEV
316static struct ttyconf {
317 gid_t gid;
318 mode_t mode;
319
320 ttyconf ()
321 {
322#ifdef TTY_GID_SUPPORT
323 struct group *gr = getgrnam ("tty");
324
325 if (gr)
326 { /* change group ownership of tty to "tty" */
327 mode = S_IRUSR | S_IWUSR | S_IWGRP;
328 gid = gr->gr_gid;
329 }
330 else
331#endif /* TTY_GID_SUPPORT */
332 {
333 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
334 gid = getgid ();
335 }
336 }
337} ttyconf;
338
339/////////////////////////////////////////////////////////////////////////////
340
341void
342rxvt_ptytty_unix::privileges (rxvt_privaction action)
343{
344 if (!name || !*name)
345 return;
346
347 if (action == SAVE)
348 {
349# ifndef RESET_TTY_TO_COMMON_DEFAULTS
350 /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */
351 if (lstat (name, &savestat) < 0) /* you lose out */
352 ;
353 else
354# endif
355 {
356 saved = true;
357 chown (name, getuid (), ttyconf.gid); /* fail silently */
358 chmod (name, ttyconf.mode);
359# ifdef HAVE_REVOKE
360 revoke (name);
361# endif
362 }
363 }
364 else
365 { /* action == RESTORE */
366# ifndef RESET_TTY_TO_COMMON_DEFAULTS
367 if (saved)
368 {
369 chmod (name, savestat.st_mode);
370 chown (name, savestat.st_uid, savestat.st_gid);
371 }
372# else
373 chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH));
374 chown (name, 0, 0);
375# endif
376
377 }
378}
379#endif
380
381rxvt_ptytty_unix::rxvt_ptytty_unix ()
382{
383 pty = tty = -1;
384 name = 0;
385#ifndef NO_SETOWNER_TTYDEV
386 saved = false;
387#endif
388#if UTMP_SUPPORT
389 cmd_pid = 0;
390#endif
391}
392
393rxvt_ptytty_unix::~rxvt_ptytty_unix ()
394{
395#if UTMP_SUPPORT
396 logout ();
397#endif
398 put ();
399}
400
401void
402rxvt_ptytty_unix::put ()
403{
404#ifndef NO_SETOWNER_TTYDEV
405 privileges (RESTORE);
406#endif
407
408 if (pty >= 0) close (pty);
409 close_tty ();
410 free (name);
411
412 pty = tty = -1;
413 name = 0;
414}
415
416bool
417rxvt_ptytty_unix::get ()
418{
419 /* get master (pty) */
420 if ((pty = get_pty (&tty, &name)) < 0)
421 return false;
422
423 fcntl (pty, F_SETFL, O_NONBLOCK);
424
425 /* get slave (tty) */
426 if (tty < 0)
427 {
428#ifndef NO_SETOWNER_TTYDEV
429 privileges (SAVE);
430#endif
431
432 if ((tty = get_tty (name)) < 0)
433 {
434 put ();
435 return false;
436 }
437 }
438
439 return true;
440}
441
442#if PTYTTY_HELPER
443
444static int sock_fd;
445static int pid;
446
447struct command
448{
449 enum { get, login, destroy } type;
450
451 rxvt_ptytty *id;
452
453 bool login_shell;
454 int cmd_pid;
455 char hostname[512]; // arbitrary, but should be plenty
456};
457
458struct rxvt_ptytty_proxy : zero_initialized, rxvt_ptytty
459{
460 rxvt_ptytty *id;
461
462 ~rxvt_ptytty_proxy ();
463
464 bool get ();
465 void login (int cmd_pid, bool login_shell, const char *hostname);
466};
467
468bool
469rxvt_ptytty_proxy::get ()
470{
471 command cmd;
472
473 cmd.type = command::get;
474
475 write (sock_fd, &cmd, sizeof (cmd));
476
477 if (read (sock_fd, &id, sizeof (id)) != sizeof (id))
478 rxvt_fatal ("protocol error while creating pty using helper process, aborting.\n");
479
480 if (!id)
481 return false;
482
483 if ((pty = rxvt_recv_fd (sock_fd)) < 0
484 || (tty = rxvt_recv_fd (sock_fd)) < 0)
485 rxvt_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n");
486
487 return true;
488}
489
490void
491rxvt_ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname)
492{
493 command cmd;
494
495 cmd.type = command::login;
496 cmd.id = id;
497 cmd.cmd_pid = cmd_pid;
498 cmd.login_shell = login_shell;
499 strncpy (cmd.hostname, hostname, sizeof (cmd.hostname));
500
501 write (sock_fd, &cmd, sizeof (cmd));
502}
503
504rxvt_ptytty_proxy::~rxvt_ptytty_proxy ()
505{
506 command cmd;
507
508 cmd.type = command::destroy;
509 cmd.id = id;
510
511 write (sock_fd, &cmd, sizeof (cmd));
512}
513
514static
515void serve ()
516{
517 command cmd;
518 vector<rxvt_ptytty *> ptys;
519
520 while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command))
521 {
522 if (cmd.type == command::get)
523 {
524 // -> id ptyfd ttyfd
525 cmd.id = new rxvt_ptytty_unix;
526
527 if (cmd.id->get ())
528 {
529 write (sock_fd, &cmd.id, sizeof (cmd.id));
530 ptys.push_back (cmd.id);
531
532 rxvt_send_fd (sock_fd, cmd.id->pty);
533 rxvt_send_fd (sock_fd, cmd.id->tty);
534 }
535 else
536 {
537 delete cmd.id;
538 cmd.id = 0;
539 write (sock_fd, &cmd.id, sizeof (cmd.id));
540 }
541 }
542 else if (cmd.type == command::login)
543 {
544#if UTMP_SUPPORT
545 if (find (ptys.begin (), ptys.end (), cmd.id))
546 {
547 cmd.hostname[sizeof (cmd.hostname) - 1] = 0;
548 cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname);
549 }
550#endif
551 }
552 else if (cmd.type == command::destroy)
553 {
554 rxvt_ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id);
555
556 if (pty)
557 {
558 delete *pty;
559 ptys.erase (pty);
560 }
561 }
562 else
563 break;
564 }
565
566 // destroy all ptys
567 for (rxvt_ptytty **i = ptys.end (); i-- > ptys.begin (); )
568 delete *i;
569}
570
571void rxvt_ptytty_server ()
572{
573 int sv[2];
574
575 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv))
576 rxvt_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n");
577
578 pid = fork ();
579
580 if (pid < 0)
581 rxvt_fatal ("could not create pty/sessiondb helper process, aborting.\n");
582
583 if (pid)
584 {
585 // client, urxvt
586 sock_fd = sv[0];
587 close (sv[1]);
588 fcntl (sock_fd, F_SETFD, FD_CLOEXEC);
589 }
590 else
591 {
592 setgid (getegid ());
593 setuid (geteuid ());
594
595 // server, pty-helper
596 sock_fd = sv[1];
597
598 for (int fd = 0; fd < 1023; fd++)
599 if (fd != sock_fd && fd != 1)
600 close (fd);
601
602 serve ();
603 _exit (EXIT_SUCCESS);
604 }
605}
606#endif
607
608// a "factory" *g*
609rxvt_ptytty *
610rxvt_new_ptytty ()
611{
612#if PTYTTY_HELPER
613 if (pid > 0)
614 // use helper process
615 return new rxvt_ptytty_proxy;
616 else
617#endif
618 return new rxvt_ptytty_unix;
619}
620
312/*----------------------- end-of-file (C source) -----------------------*/ 621/*----------------------- end-of-file (C source) -----------------------*/
622

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