1 |
root |
1.8 |
/*----------------------------------------------------------------------* |
2 |
root |
1.1 |
* File: ptytty.C |
3 |
|
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*----------------------------------------------------------------------* |
4 |
|
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* |
5 |
|
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* All portions of code are copyright by their respective author/s. |
6 |
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* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
7 |
sf-exg |
1.38 |
* Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de> |
8 |
root |
1.12 |
* Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> |
9 |
root |
1.1 |
* |
10 |
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* This program is free software; you can redistribute it and/or modify |
11 |
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* it under the terms of the GNU General Public License as published by |
12 |
sf-exg |
1.54 |
* the Free Software Foundation; either version 2 of the License, or |
13 |
root |
1.1 |
* (at your option) any later version. |
14 |
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* |
15 |
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* This program is distributed in the hope that it will be useful, |
16 |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 |
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* GNU General Public License for more details. |
19 |
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* |
20 |
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* You should have received a copy of the GNU General Public License |
21 |
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* along with this program; if not, write to the Free Software |
22 |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
23 |
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*---------------------------------------------------------------------*/ |
24 |
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|
25 |
sf-exg |
1.36 |
#include "config.h" |
26 |
root |
1.1 |
|
27 |
root |
1.3 |
#include "ptytty.h" |
28 |
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|
29 |
sf-exg |
1.49 |
#include <stdlib.h> |
30 |
sf-exg |
1.51 |
#include <stdio.h> |
31 |
sf-exg |
1.50 |
#include <string.h> |
32 |
root |
1.2 |
|
33 |
|
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#include <sys/types.h> |
34 |
ayin |
1.34 |
#include <sys/stat.h> |
35 |
root |
1.2 |
#include <unistd.h> |
36 |
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#include <fcntl.h> |
37 |
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|
38 |
root |
1.1 |
#ifdef HAVE_SYS_IOCTL_H |
39 |
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# include <sys/ioctl.h> |
40 |
|
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#endif |
41 |
sf-exg |
1.52 |
#ifdef HAVE_STROPTS_H |
42 |
root |
1.1 |
# include <stropts.h> |
43 |
|
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#endif |
44 |
root |
1.2 |
#if defined(HAVE_PTY_H) |
45 |
root |
1.1 |
# include <pty.h> |
46 |
root |
1.2 |
#elif defined(HAVE_LIBUTIL_H) |
47 |
root |
1.1 |
# include <libutil.h> |
48 |
root |
1.2 |
#elif defined(HAVE_UTIL_H) |
49 |
root |
1.1 |
# include <util.h> |
50 |
|
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#endif |
51 |
root |
1.2 |
#ifdef TTY_GID_SUPPORT |
52 |
|
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#include <grp.h> |
53 |
|
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#endif |
54 |
root |
1.1 |
|
55 |
sf-exg |
1.47 |
#ifndef O_NOCTTY |
56 |
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# define O_NOCTTY 0 |
57 |
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#endif |
58 |
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|
59 |
root |
1.2 |
///////////////////////////////////////////////////////////////////////////// |
60 |
root |
1.1 |
|
61 |
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/* ------------------------------------------------------------------------- * |
62 |
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* GET PSEUDO TELETYPE - MASTER AND SLAVE * |
63 |
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* ------------------------------------------------------------------------- */ |
64 |
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/* |
65 |
ayin |
1.26 |
* Returns pty file descriptor, or -1 on failure |
66 |
root |
1.1 |
* If successful, ttydev is set to the name of the slave device. |
67 |
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* fd_tty _may_ also be set to an open fd to the slave device |
68 |
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*/ |
69 |
root |
1.2 |
#if defined(UNIX98_PTY) |
70 |
root |
1.25 |
|
71 |
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static int |
72 |
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get_pty (int *fd_tty, char **ttydev) |
73 |
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{ |
74 |
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int pfd; |
75 |
root |
1.1 |
|
76 |
root |
1.2 |
# if defined(HAVE_GETPT) |
77 |
sf-exg |
1.43 |
pfd = getpt (); |
78 |
root |
1.2 |
# elif defined(HAVE_POSIX_OPENPT) |
79 |
sf-exg |
1.41 |
pfd = posix_openpt (O_RDWR | O_NOCTTY); |
80 |
root |
1.2 |
# else |
81 |
sf-exg |
1.40 |
# ifdef _AIX |
82 |
|
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pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0); |
83 |
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# else |
84 |
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pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); |
85 |
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# endif |
86 |
root |
1.2 |
# endif |
87 |
root |
1.1 |
|
88 |
root |
1.25 |
if (pfd >= 0) |
89 |
|
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{ |
90 |
|
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if (grantpt (pfd) == 0 /* change slave permissions */ |
91 |
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&& unlockpt (pfd) == 0) |
92 |
ayin |
1.32 |
{ |
93 |
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/* slave now unlocked */ |
94 |
root |
1.25 |
*ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
95 |
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return pfd; |
96 |
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} |
97 |
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|
98 |
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close (pfd); |
99 |
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} |
100 |
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|
101 |
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return -1; |
102 |
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} |
103 |
root |
1.2 |
|
104 |
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#elif defined(HAVE_OPENPTY) |
105 |
root |
1.1 |
|
106 |
root |
1.25 |
static int |
107 |
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get_pty (int *fd_tty, char **ttydev) |
108 |
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{ |
109 |
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int pfd; |
110 |
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int res; |
111 |
ayin |
1.26 |
|
112 |
ayin |
1.29 |
res = openpty (&pfd, fd_tty, NULL, NULL, NULL); |
113 |
root |
1.25 |
|
114 |
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if (res != -1) |
115 |
|
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{ |
116 |
ayin |
1.29 |
*ttydev = strdup (ttyname (*fd_tty)); |
117 |
root |
1.25 |
return pfd; |
118 |
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} |
119 |
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|
120 |
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return -1; |
121 |
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} |
122 |
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|
123 |
root |
1.2 |
#elif defined(HAVE__GETPTY) |
124 |
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|
125 |
root |
1.25 |
static int |
126 |
|
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get_pty (int *fd_tty, char **ttydev) |
127 |
|
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{ |
128 |
|
|
int pfd; |
129 |
ayin |
1.30 |
char *slave; |
130 |
root |
1.25 |
|
131 |
sf-exg |
1.42 |
slave = _getpty (&pfd, O_RDWR | O_NOCTTY, 0622, 0); |
132 |
root |
1.25 |
|
133 |
ayin |
1.33 |
if (slave != NULL) |
134 |
|
|
{ |
135 |
|
|
*ttydev = strdup (slave); |
136 |
|
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return pfd; |
137 |
|
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} |
138 |
root |
1.25 |
|
139 |
|
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return -1; |
140 |
|
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} |
141 |
root |
1.1 |
|
142 |
root |
1.2 |
#else |
143 |
root |
1.1 |
|
144 |
root |
1.25 |
/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
145 |
|
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static int |
146 |
|
|
get_pty (int *fd_tty, char **ttydev) |
147 |
|
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{ |
148 |
|
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int pfd; |
149 |
|
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int i; |
150 |
|
|
char pty_name[32]; |
151 |
|
|
char tty_name[32]; |
152 |
|
|
const char *majors = "pqrstuvwxyzabcde"; |
153 |
|
|
const char *minors = "0123456789abcdef"; |
154 |
|
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|
155 |
|
|
for (i = 0; i < 256; i++) |
156 |
|
|
{ |
157 |
sf-exg |
1.43 |
snprintf (pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
158 |
|
|
snprintf (tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
159 |
root |
1.25 |
|
160 |
|
|
if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
161 |
|
|
{ |
162 |
sf-exg |
1.43 |
snprintf (pty_name, 32, "/dev/ptyp%d", i); |
163 |
|
|
snprintf (tty_name, 32, "/dev/ttyp%d", i); |
164 |
root |
1.25 |
if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
165 |
|
|
continue; |
166 |
|
|
} |
167 |
|
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|
168 |
|
|
if (access (tty_name, R_OK | W_OK) == 0) |
169 |
|
|
{ |
170 |
|
|
*ttydev = strdup (tty_name); |
171 |
|
|
return pfd; |
172 |
|
|
} |
173 |
|
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|
174 |
|
|
close (pfd); |
175 |
|
|
} |
176 |
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|
177 |
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return -1; |
178 |
|
|
} |
179 |
ayin |
1.24 |
|
180 |
root |
1.1 |
#endif |
181 |
|
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|
182 |
|
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/*----------------------------------------------------------------------*/ |
183 |
|
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/* |
184 |
ayin |
1.26 |
* Returns tty file descriptor, or -1 on failure |
185 |
root |
1.1 |
*/ |
186 |
|
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static int |
187 |
|
|
get_tty (char *ttydev) |
188 |
|
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{ |
189 |
|
|
return open (ttydev, O_RDWR | O_NOCTTY, 0); |
190 |
|
|
} |
191 |
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|
192 |
|
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/*----------------------------------------------------------------------*/ |
193 |
|
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/* |
194 |
|
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* Make our tty a controlling tty so that /dev/tty points to us |
195 |
|
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*/ |
196 |
|
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static int |
197 |
root |
1.2 |
control_tty (int fd_tty) |
198 |
root |
1.1 |
{ |
199 |
ayin |
1.28 |
int fd; |
200 |
|
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|
201 |
root |
1.1 |
setsid (); |
202 |
|
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|
203 |
ayin |
1.27 |
#ifdef TIOCSCTTY |
204 |
root |
1.2 |
ioctl (fd_tty, TIOCSCTTY, NULL); |
205 |
ayin |
1.27 |
#else |
206 |
ayin |
1.28 |
fd = open (ttyname (fd_tty), O_RDWR); |
207 |
ayin |
1.27 |
if (fd >= 0) |
208 |
|
|
close (fd); |
209 |
|
|
#endif |
210 |
root |
1.2 |
|
211 |
ayin |
1.28 |
fd = open ("/dev/tty", O_WRONLY); |
212 |
root |
1.1 |
if (fd < 0) |
213 |
root |
1.10 |
return -1; /* fatal */ |
214 |
root |
1.2 |
|
215 |
root |
1.1 |
close (fd); |
216 |
|
|
|
217 |
|
|
return 0; |
218 |
|
|
} |
219 |
|
|
|
220 |
root |
1.2 |
void |
221 |
root |
1.4 |
ptytty::close_tty () |
222 |
root |
1.2 |
{ |
223 |
|
|
if (tty < 0) |
224 |
|
|
return; |
225 |
|
|
|
226 |
|
|
close (tty); |
227 |
|
|
tty = -1; |
228 |
|
|
} |
229 |
|
|
|
230 |
|
|
bool |
231 |
root |
1.4 |
ptytty::make_controlling_tty () |
232 |
root |
1.2 |
{ |
233 |
|
|
return control_tty (tty) >= 0; |
234 |
|
|
} |
235 |
|
|
|
236 |
|
|
void |
237 |
root |
1.4 |
ptytty::set_utf8_mode (bool on) |
238 |
root |
1.2 |
{ |
239 |
|
|
#ifdef IUTF8 |
240 |
|
|
if (pty < 0) |
241 |
|
|
return; |
242 |
|
|
|
243 |
|
|
struct termios tio; |
244 |
|
|
|
245 |
|
|
if (tcgetattr (pty, &tio) != -1) |
246 |
|
|
{ |
247 |
|
|
tcflag_t new_cflag = tio.c_iflag; |
248 |
|
|
|
249 |
|
|
if (on) |
250 |
|
|
new_cflag |= IUTF8; |
251 |
|
|
else |
252 |
|
|
new_cflag &= ~IUTF8; |
253 |
|
|
|
254 |
|
|
if (new_cflag != tio.c_iflag) |
255 |
|
|
{ |
256 |
|
|
tio.c_iflag = new_cflag; |
257 |
|
|
tcsetattr (pty, TCSANOW, &tio); |
258 |
|
|
} |
259 |
|
|
} |
260 |
|
|
#endif |
261 |
|
|
} |
262 |
|
|
|
263 |
root |
1.1 |
static struct ttyconf { |
264 |
|
|
gid_t gid; |
265 |
|
|
mode_t mode; |
266 |
|
|
|
267 |
|
|
ttyconf () |
268 |
|
|
{ |
269 |
|
|
#ifdef TTY_GID_SUPPORT |
270 |
|
|
struct group *gr = getgrnam ("tty"); |
271 |
|
|
|
272 |
|
|
if (gr) |
273 |
ayin |
1.32 |
{ |
274 |
|
|
/* change group ownership of tty to "tty" */ |
275 |
root |
1.1 |
mode = S_IRUSR | S_IWUSR | S_IWGRP; |
276 |
|
|
gid = gr->gr_gid; |
277 |
|
|
} |
278 |
|
|
else |
279 |
ayin |
1.31 |
#endif /* TTY_GID_SUPPORT */ |
280 |
root |
1.1 |
{ |
281 |
|
|
mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
282 |
root |
1.2 |
gid = 0; |
283 |
root |
1.1 |
} |
284 |
|
|
} |
285 |
|
|
} ttyconf; |
286 |
|
|
|
287 |
root |
1.4 |
ptytty_unix::ptytty_unix () |
288 |
root |
1.1 |
{ |
289 |
|
|
name = 0; |
290 |
root |
1.2 |
#if UTMP_SUPPORT |
291 |
|
|
cmd_pid = 0; |
292 |
root |
1.1 |
#endif |
293 |
|
|
} |
294 |
|
|
|
295 |
root |
1.4 |
ptytty_unix::~ptytty_unix () |
296 |
root |
1.1 |
{ |
297 |
root |
1.2 |
#if UTMP_SUPPORT |
298 |
|
|
logout (); |
299 |
|
|
#endif |
300 |
root |
1.1 |
put (); |
301 |
|
|
} |
302 |
|
|
|
303 |
|
|
void |
304 |
root |
1.4 |
ptytty_unix::put () |
305 |
root |
1.2 |
{ |
306 |
root |
1.25 |
if (name) |
307 |
|
|
{ |
308 |
|
|
chmod (name, RESTORE_TTY_MODE); |
309 |
|
|
chown (name, 0, ttyconf.gid); |
310 |
|
|
} |
311 |
root |
1.1 |
|
312 |
root |
1.2 |
close_tty (); |
313 |
root |
1.1 |
|
314 |
root |
1.2 |
if (pty >= 0) |
315 |
|
|
close (pty); |
316 |
root |
1.1 |
|
317 |
|
|
free (name); |
318 |
|
|
|
319 |
|
|
pty = tty = -1; |
320 |
|
|
name = 0; |
321 |
|
|
} |
322 |
|
|
|
323 |
|
|
bool |
324 |
root |
1.4 |
ptytty_unix::get () |
325 |
root |
1.1 |
{ |
326 |
|
|
/* get master (pty) */ |
327 |
|
|
if ((pty = get_pty (&tty, &name)) < 0) |
328 |
|
|
return false; |
329 |
|
|
|
330 |
|
|
/* get slave (tty) */ |
331 |
|
|
if (tty < 0) |
332 |
|
|
{ |
333 |
|
|
#ifndef NO_SETOWNER_TTYDEV |
334 |
root |
1.2 |
chown (name, getuid (), ttyconf.gid); /* fail silently */ |
335 |
|
|
chmod (name, ttyconf.mode); |
336 |
|
|
# ifdef HAVE_REVOKE |
337 |
|
|
revoke (name); |
338 |
|
|
# endif |
339 |
root |
1.1 |
#endif |
340 |
|
|
|
341 |
|
|
if ((tty = get_tty (name)) < 0) |
342 |
|
|
{ |
343 |
|
|
put (); |
344 |
|
|
return false; |
345 |
|
|
} |
346 |
|
|
} |
347 |
|
|
|
348 |
sf-exg |
1.40 |
#if defined(I_PUSH) |
349 |
sf-exg |
1.39 |
/* |
350 |
|
|
* Push STREAMS modules: |
351 |
|
|
* ptem: pseudo-terminal hardware emulation module. |
352 |
|
|
* ldterm: standard terminal line discipline. |
353 |
|
|
* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
354 |
|
|
* |
355 |
sf-exg |
1.55 |
* On Solaris, a process can acquire a controlling terminal in the |
356 |
|
|
* following ways: |
357 |
|
|
* - open() of /dev/ptmx or of a slave device without O_NOCTTY |
358 |
|
|
* - I_PUSH ioctl() of the "ptem" or "ldterm" module on a slave device |
359 |
|
|
* The second case is problematic, because it cannot be disabled. |
360 |
|
|
* Fortunately, Solaris (10 and 11 at least) provides an undocumented |
361 |
|
|
* __IPUSH_NOCTTY ioctl which does not have this side-effect, so we |
362 |
|
|
* use it if defined. See |
363 |
|
|
* https://github.com/illumos/illumos-gate/blob/master/usr/src/uts/common/os/streamio.c#L3755 |
364 |
|
|
* https://github.com/illumos/illumos-gate/blob/master/usr/src/uts/common/io/ptem.c#L203 |
365 |
|
|
* https://github.com/illumos/illumos-gate/blob/master/usr/src/uts/common/io/ldterm.c#L794 |
366 |
|
|
* Note that an open() of a slave device autoloads the modules, |
367 |
|
|
* with __I_PUSH_NOCTTY, if xpg[46] mode is enabled (which requires |
368 |
|
|
* linking /usr/lib/values-xpg[46].o). |
369 |
|
|
* https://github.com/illumos/illumos-gate/blob/master/usr/src/lib/libc/port/sys/open.c#L173 |
370 |
sf-exg |
1.39 |
*/ |
371 |
sf-exg |
1.55 |
|
372 |
|
|
#ifdef __I_PUSH_NOCTTY |
373 |
|
|
# define PT_I_PUSH __I_PUSH_NOCTTY |
374 |
|
|
#else |
375 |
|
|
# define PT_I_PUSH I_PUSH |
376 |
|
|
#endif |
377 |
|
|
|
378 |
sf-exg |
1.39 |
#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H) |
379 |
|
|
if (isastream (tty) == 1) |
380 |
|
|
# endif |
381 |
|
|
{ |
382 |
sf-exg |
1.56 |
if (!ioctl (tty, I_FIND, "ptem")) |
383 |
|
|
ioctl (tty, PT_I_PUSH, "ptem"); |
384 |
|
|
|
385 |
|
|
if (!ioctl (tty, I_FIND, "ldterm")) |
386 |
|
|
ioctl (tty, PT_I_PUSH, "ldterm"); |
387 |
|
|
|
388 |
|
|
if (!ioctl (tty, I_FIND, "ttcompat")) |
389 |
|
|
ioctl (tty, PT_I_PUSH, "ttcompat"); |
390 |
sf-exg |
1.39 |
} |
391 |
|
|
#endif |
392 |
|
|
|
393 |
sf-exg |
1.44 |
#if UTMP_SUPPORT |
394 |
|
|
# if defined(HAVE_STRUCT_UTMP) && !defined(HAVE_UTMP_PID) |
395 |
|
|
int fd_stdin = dup (STDIN_FILENO); |
396 |
|
|
dup2 (tty, STDIN_FILENO); |
397 |
|
|
|
398 |
|
|
utmp_pos = ttyslot (); |
399 |
|
|
|
400 |
|
|
dup2 (fd_stdin, STDIN_FILENO); |
401 |
|
|
close (fd_stdin); |
402 |
|
|
# endif |
403 |
|
|
#endif |
404 |
|
|
|
405 |
root |
1.1 |
return true; |
406 |
|
|
} |
407 |
|
|
|