summaryrefslogtreecommitdiffstats
path: root/crypto/openssh/openbsd-compat/bsd-openpty.c
blob: 9777eb556d2d80c96bd2b51bf18fc9551679aa08 (plain)
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
/*
 * Please note: this implementation of openpty() is far from complete.
 * it is just enough for portable OpenSSH's needs.
 */

/*
 * Copyright (c) 2004 Damien Miller <djm@mindrot.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * Allocating a pseudo-terminal, and making it the controlling tty.
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 */

#include "includes.h"
#if !defined(HAVE_OPENPTY)

#include <sys/types.h>

#include <stdlib.h>

#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif

#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif

#ifdef HAVE_UTIL_H
# include <util.h>
#endif /* HAVE_UTIL_H */

#ifdef HAVE_PTY_H
# include <pty.h>
#endif
#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
# include <sys/stropts.h>
#endif

#include <signal.h>
#include <string.h>
#include <unistd.h>

#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif

int
openpty(int *amaster, int *aslave, char *name, struct termios *termp,
   struct winsize *winp)
{
#if defined(HAVE__GETPTY)
	/*
	 * _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more
	 * pty's automagically when needed
	 */
	char *slave;

	if ((slave = _getpty(amaster, O_RDWR, 0622, 0)) == NULL)
		return (-1);

	/* Open the slave side. */
	if ((*aslave = open(slave, O_RDWR | O_NOCTTY)) == -1) {
		close(*amaster);
		return (-1);
	}
	return (0);

#elif defined(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;
	mysig_t old_signal;

	if ((ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY)) == -1)
		return (-1);

	/* XXX: need to close ptm on error? */
	old_signal = signal(SIGCHLD, SIG_DFL);
	if (grantpt(ptm) < 0)
		return (-1);
	signal(SIGCHLD, old_signal);

	if (unlockpt(ptm) < 0)
		return (-1);

	if ((pts = ptsname(ptm)) == NULL)
		return (-1);
	*amaster = ptm;

	/* Open the slave side. */
	if ((*aslave = open(pts, O_RDWR | O_NOCTTY)) == -1) {
		close(*amaster);
		return (-1);
	}

	/*
	 * Try to push the appropriate streams modules, as described 
	 * in Solaris pts(7).
	 */
	ioctl(*aslave, I_PUSH, "ptem");
	ioctl(*aslave, I_PUSH, "ldterm");
# ifndef __hpux
	ioctl(*aslave, I_PUSH, "ttcompat");
# endif /* __hpux */

	return (0);

#elif defined(HAVE_DEV_PTS_AND_PTC)
	/* AIX-style pty code. */
	const char *ttname;

	if ((*amaster = open("/dev/ptc", O_RDWR | O_NOCTTY)) == -1)
		return (-1);
	if ((ttname = ttyname(*amaster)) == NULL)
		return (-1);
	if ((*aslave = open(ttname, O_RDWR | O_NOCTTY)) == -1) {
		close(*amaster);
		return (-1);
	}
	return (0);

#elif defined(_UNICOS)
	char ptbuf[64], ttbuf[64];
	int i;
	int highpty;

	highpty = 128;
#ifdef _SC_CRAY_NPTY
	if ((highpty = sysconf(_SC_CRAY_NPTY)) == -1)
		highpty = 128;
#endif /* _SC_CRAY_NPTY */

	for (i = 0; i < highpty; i++) {
		snprintf(ptbuf, sizeof(ptbuf), "/dev/pty/%03d", i);
		snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%03d", i);
		if ((*amaster = open(ptbuf, O_RDWR|O_NOCTTY)) == -1)
			continue;
		/* Open the slave side. */
		if ((*aslave = open(ttbuf, O_RDWR|O_NOCTTY)) == -1) {
			close(*amaster);
			return (-1);
		}
		return (0);
	}
	return (-1);

#else
	/* BSD-style pty code. */
	char ptbuf[64], ttbuf[64];
	int i;
	const char *ptymajors = "pqrstuvwxyzabcdefghijklmno"
	    "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	const char *ptyminors = "0123456789abcdef";
	int num_minors = strlen(ptyminors);
	int num_ptys = strlen(ptymajors) * num_minors;
	struct termios tio;

	for (i = 0; i < num_ptys; i++) {
		snprintf(ptbuf, sizeof(ptbuf), "/dev/pty%c%c", 
		    ptymajors[i / num_minors], ptyminors[i % num_minors]);
		snprintf(ttbuf, sizeof(ttbuf), "/dev/tty%c%c",
		    ptymajors[i / num_minors], ptyminors[i % num_minors]);

		if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) {
			/* Try SCO style naming */
			snprintf(ptbuf, sizeof(ptbuf), "/dev/ptyp%d", i);
			snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%d", i);
			if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1)
				continue;
		}

		/* Open the slave side. */
		if ((*aslave = open(ttbuf, O_RDWR | O_NOCTTY)) == -1) {
			close(*amaster);
			return (-1);
		}
		/* set tty modes to a sane state for broken clients */
		if (tcgetattr(*amaster, &tio) != -1) {
			tio.c_lflag |= (ECHO | ISIG | ICANON);
			tio.c_oflag |= (OPOST | ONLCR);
			tio.c_iflag |= ICRNL;
			tcsetattr(*amaster, TCSANOW, &tio);
		}

		return (0);
	}
	return (-1);
#endif
}

#endif /* !defined(HAVE_OPENPTY) */

OpenPOWER on IntegriCloud