1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
|
/*
pty.c
Author: Tatu Ylonen <ylo@cs.hut.fi>
Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
All rights reserved
Created: Fri Mar 17 04:37:25 1995 ylo
Allocating a pseudo-terminal, and making it the controlling tty.
*/
#include "includes.h"
RCSID("$Id: pty.c,v 1.1 1999/09/26 20:53:36 deraadt Exp $");
#include "pty.h"
#include "ssh.h"
/* Pty allocated with _getpty gets broken if we do I_PUSH:es to it. */
#if defined(HAVE__GETPTY) || defined(HAVE_OPENPTY)
#undef HAVE_DEV_PTMX
#endif
#ifdef HAVE_DEV_PTMX
#include <sys/stream.h>
#include <stropts.h>
#include <sys/conf.h>
#endif /* HAVE_DEV_PTMX */
#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif
/* Allocates and opens a pty. Returns 0 if no pty could be allocated,
or nonzero if a pty was successfully allocated. On success, open file
descriptors for the pty and tty sides and the name of the tty side are
returned (the buffer must be able to hold at least 64 characters). */
int pty_allocate(int *ptyfd, int *ttyfd, char *namebuf)
{
#ifdef HAVE_OPENPTY
/* openpty(3) exists in OSF/1 and some other os'es */
int i;
i = openpty(ptyfd, ttyfd, namebuf, NULL, NULL);
if (i < 0)
{
error("openpty: %.100s", strerror(errno));
return 0;
}
return 1;
#else /* HAVE_OPENPTY */
#ifdef HAVE__GETPTY
/* _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more
pty's automagically when needed */
char *slave;
slave = _getpty(ptyfd, O_RDWR, 0622, 0);
if (slave == NULL)
{
error("_getpty: %.100s", strerror(errno));
return 0;
}
strcpy(namebuf, slave);
/* Open the slave side. */
*ttyfd = open(namebuf, O_RDWR|O_NOCTTY);
if (*ttyfd < 0)
{
error("%.200s: %.100s", namebuf, strerror(errno));
close(*ptyfd);
return 0;
}
return 1;
#else /* HAVE__GETPTY */
#ifdef HAVE_DEV_PTMX
/* This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3 also has
bsd-style ptys, but they simply do not work.) */
int ptm;
char *pts;
ptm = open("/dev/ptmx", O_RDWR|O_NOCTTY);
if (ptm < 0)
{
error("/dev/ptmx: %.100s", strerror(errno));
return 0;
}
if (grantpt(ptm) < 0)
{
error("grantpt: %.100s", strerror(errno));
return 0;
}
if (unlockpt(ptm) < 0)
{
error("unlockpt: %.100s", strerror(errno));
return 0;
}
pts = ptsname(ptm);
if (pts == NULL)
error("Slave pty side name could not be obtained.");
strcpy(namebuf, pts);
*ptyfd = ptm;
/* Open the slave side. */
*ttyfd = open(namebuf, O_RDWR|O_NOCTTY);
if (*ttyfd < 0)
{
error("%.100s: %.100s", namebuf, strerror(errno));
close(*ptyfd);
return 0;
}
/* Push the appropriate streams modules, as described in Solaris pts(7). */
if (ioctl(*ttyfd, I_PUSH, "ptem") < 0)
error("ioctl I_PUSH ptem: %.100s", strerror(errno));
if (ioctl(*ttyfd, I_PUSH, "ldterm") < 0)
error("ioctl I_PUSH ldterm: %.100s", strerror(errno));
if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0)
error("ioctl I_PUSH ttcompat: %.100s", strerror(errno));
return 1;
#else /* HAVE_DEV_PTMX */
#ifdef HAVE_DEV_PTS_AND_PTC
/* AIX-style pty code. */
const char *name;
*ptyfd = open("/dev/ptc", O_RDWR|O_NOCTTY);
if (*ptyfd < 0)
{
error("Could not open /dev/ptc: %.100s", strerror(errno));
return 0;
}
name = ttyname(*ptyfd);
if (!name)
fatal("Open of /dev/ptc returns device for which ttyname fails.");
strcpy(namebuf, name);
*ttyfd = open(name, O_RDWR|O_NOCTTY);
if (*ttyfd < 0)
{
error("Could not open pty slave side %.100s: %.100s",
name, strerror(errno));
close(*ptyfd);
return 0;
}
return 1;
#else /* HAVE_DEV_PTS_AND_PTC */
#ifdef CRAY
char buf[64];
int i;
for (i = 0; i < 128; i++)
{
sprintf(buf, "/dev/pty/%03d", i);
*ptyfd = open(buf, O_RDWR|O_NOCTTY);
if (*ptyfd < 0)
continue;
sprintf(namebuf, "/dev/ttyp%03d", i);
/* Open the slave side. */
*ttyfd = open(namebuf, O_RDWR|O_NOCTTY);
if (*ttyfd < 0)
{
error("%.100s: %.100s", namebuf, strerror(errno));
close(*ptyfd);
return 0;
}
return 1;
}
return 0;
#else /* CRAY */
/* BSD-style pty code. */
char buf[64];
int i;
const char *ptymajors =
"pqrstuvwxyzabcdefghijklmnoABCDEFGHIJKLMNOPQRSTUVWXYZ";
const char *ptyminors = "0123456789abcdef";
int num_minors = strlen(ptyminors);
int num_ptys = strlen(ptymajors) * num_minors;
for (i = 0; i < num_ptys; i++)
{
sprintf(buf, "/dev/pty%c%c", ptymajors[i / num_minors],
ptyminors[i % num_minors]);
*ptyfd = open(buf, O_RDWR|O_NOCTTY);
if (*ptyfd < 0)
continue;
sprintf(namebuf, "/dev/tty%c%c", ptymajors[i / num_minors],
ptyminors[i % num_minors]);
/* Open the slave side. */
*ttyfd = open(namebuf, O_RDWR|O_NOCTTY);
if (*ttyfd < 0)
{
error("%.100s: %.100s", namebuf, strerror(errno));
close(*ptyfd);
return 0;
}
return 1;
}
return 0;
#endif /* CRAY */
#endif /* HAVE_DEV_PTS_AND_PTC */
#endif /* HAVE_DEV_PTMX */
#endif /* HAVE__GETPTY */
#endif /* HAVE_OPENPTY */
}
/* Releases the tty. Its ownership is returned to root, and permissions to
0666. */
void pty_release(const char *ttyname)
{
if (chown(ttyname, (uid_t)0, (gid_t)0) < 0)
debug("chown %.100s 0 0 failed: %.100s", ttyname, strerror(errno));
if (chmod(ttyname, (mode_t)0666) < 0)
debug("chmod %.100s 0666 failed: %.100s", ttyname, strerror(errno));
}
/* Makes the tty the processes controlling tty and sets it to sane modes. */
void pty_make_controlling_tty(int *ttyfd, const char *ttyname)
{
int fd;
/* First disconnect from the old controlling tty. */
#ifdef TIOCNOTTY
fd = open("/dev/tty", O_RDWR|O_NOCTTY);
if (fd >= 0)
{
(void)ioctl(fd, TIOCNOTTY, NULL);
close(fd);
}
#endif /* TIOCNOTTY */
#ifdef HAVE_SETSID
#ifdef ultrix
setpgrp(0, 0);
#else /* ultrix */
if (setsid() < 0)
error("setsid: %.100s", strerror(errno));
#endif /* ultrix */
#endif /* HAVE_SETSID */
/* Verify that we are successfully disconnected from the controlling tty. */
fd = open("/dev/tty", O_RDWR|O_NOCTTY);
if (fd >= 0)
{
error("Failed to disconnect from controlling tty.");
close(fd);
}
/* Make it our controlling tty. */
#ifdef TIOCSCTTY
debug("Setting controlling tty using TIOCSCTTY.");
/* We ignore errors from this, because HPSUX defines TIOCSCTTY, but returns
EINVAL with these arguments, and there is absolutely no documentation. */
ioctl(*ttyfd, TIOCSCTTY, NULL);
#endif /* TIOCSCTTY */
fd = open(ttyname, O_RDWR);
if (fd < 0)
error("%.100s: %.100s", ttyname, strerror(errno));
else
close(fd);
/* Verify that we now have a controlling tty. */
fd = open("/dev/tty", O_WRONLY);
if (fd < 0)
error("open /dev/tty failed - could not set controlling tty: %.100s",
strerror(errno));
else
{
close(fd);
#ifdef HAVE_VHANGUP
signal(SIGHUP, SIG_IGN);
vhangup();
signal(SIGHUP, SIG_DFL);
fd = open(ttyname, O_RDWR);
if (fd == -1)
error("pty_make_controlling_tty: reopening controlling tty after vhangup failed for %.100s",
ttyname);
close(*ttyfd);
*ttyfd = fd;
#endif /* HAVE_VHANGUP */
}
}
/* Changes the window size associated with the pty. */
void pty_change_window_size(int ptyfd, int row, int col,
int xpixel, int ypixel)
{
struct winsize w;
w.ws_row = row;
w.ws_col = col;
w.ws_xpixel = xpixel;
w.ws_ypixel = ypixel;
(void)ioctl(ptyfd, TIOCSWINSZ, &w);
}
|
