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Damien Millerf4da3bb2004-01-21 17:07:16 +11001/*
2 * Please note: this implementation of openpty() is far from complete.
3 * it is just enough for portable OpenSSH's needs.
4 */
5
6/*
Damien Miller98225c22004-02-17 16:49:41 +11007 * Copyright (c) 2004 Damien Miller <djm@mindrot.org>
Damien Millerf4da3bb2004-01-21 17:07:16 +11008 *
Damien Miller98225c22004-02-17 16:49:41 +11009 * Permission to use, copy, modify, and distribute this software for any
10 * purpose with or without fee is hereby granted, provided that the above
11 * copyright notice and this permission notice appear in all copies.
Damien Millerf4da3bb2004-01-21 17:07:16 +110012 *
Damien Miller98225c22004-02-17 16:49:41 +110013 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
Damien Millerf4da3bb2004-01-21 17:07:16 +110020 */
21
22/*
23 * Author: Tatu Ylonen <ylo@cs.hut.fi>
24 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
25 * All rights reserved
26 * Allocating a pseudo-terminal, and making it the controlling tty.
27 *
28 * As far as I am concerned, the code I have written for this software
29 * can be used freely for any purpose. Any derived versions of this
30 * software must be clearly marked as such, and if the derived work is
31 * incompatible with the protocol description in the RFC file, it must be
32 * called by a name other than "ssh" or "Secure Shell".
33 */
34
35#include "includes.h"
36#if !defined(HAVE_OPENPTY)
37
38#ifdef HAVE_UTIL_H
39# include <util.h>
40#endif /* HAVE_UTIL_H */
41
42#ifdef HAVE_PTY_H
43# include <pty.h>
44#endif
45#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
46# include <sys/stropts.h>
47#endif
48
49#ifndef O_NOCTTY
50#define O_NOCTTY 0
51#endif
52
53int
54openpty(int *amaster, int *aslave, char *name, struct termios *termp,
55 struct winsize *winp)
56{
57#if defined(HAVE__GETPTY)
58 /*
59 * _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more
60 * pty's automagically when needed
61 */
62 char *slave;
63
64 if ((slave = _getpty(amaster, O_RDWR, 0622, 0)) == NULL)
65 return (-1);
66
67 /* Open the slave side. */
68 if ((*aslave = open(slave, O_RDWR | O_NOCTTY)) == -1) {
69 close(*amaster);
70 return (-1);
71 }
72 return (0);
73
74#elif defined(HAVE_DEV_PTMX)
75 /*
76 * This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3
77 * also has bsd-style ptys, but they simply do not work.)
78 */
79 int ptm;
80 char *pts;
81 mysig_t old_signal;
82
83 if ((ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY)) == -1)
84 return (-1);
85
86 /* XXX: need to close ptm on error? */
87 old_signal = signal(SIGCHLD, SIG_DFL);
88 if (grantpt(ptm) < 0)
89 return (-1);
90 signal(SIGCHLD, old_signal);
91
92 if (unlockpt(ptm) < 0)
93 return (-1);
94
95 if ((pts = ptsname(ptm)) == NULL)
96 return (-1);
97 *amaster = ptm;
98
99 /* Open the slave side. */
100 if ((*aslave = open(pts, O_RDWR | O_NOCTTY)) == -1) {
101 close(*amaster);
102 return (-1);
103 }
104
105#ifndef HAVE_CYGWIN
106 /*
107 * Try to push the appropriate streams modules, as described
108 * in Solaris pts(7).
109 */
110 ioctl(*aslave, I_PUSH, "ptem");
111 ioctl(*aslave, I_PUSH, "ldterm");
112# ifndef __hpux
113 ioctl(*aslave, I_PUSH, "ttcompat");
114# endif /* __hpux */
115#endif /* HAVE_CYGWIN */
116
117 return (0);
118
119#elif defined(HAVE_DEV_PTS_AND_PTC)
120 /* AIX-style pty code. */
121 const char *ttname;
122
123 if ((*amaster = open("/dev/ptc", O_RDWR | O_NOCTTY)) == -1)
124 return (-1);
125 if ((ttname = ttyname(*amaster)) == NULL)
126 return (-1);
127 if ((*aslave = open(ttname, O_RDWR | O_NOCTTY)) == -1) {
128 close(*amaster);
129 return (-1);
130 }
131 return (0);
132
133#elif defined(_UNICOS)
134 char ptbuf[64], ttbuf[64];
135 int i;
136 int highpty;
137
138 highpty = 128;
139#ifdef _SC_CRAY_NPTY
140 if ((highpty = sysconf(_SC_CRAY_NPTY)) == -1)
141 highpty = 128;
142#endif /* _SC_CRAY_NPTY */
143
144 for (i = 0; i < highpty; i++) {
145 snprintf(ptbuf, sizeof(ptbuf), "/dev/pty/%03d", i);
Damien Miller68144112004-01-24 13:50:39 +1100146 snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%03d", i);
Damien Millerf4da3bb2004-01-21 17:07:16 +1100147 if ((*amaster = open(ptbuf, O_RDWR|O_NOCTTY)) == -1)
148 continue;
149 /* Open the slave side. */
150 if ((*aslave = open(ttbuf, O_RDWR|O_NOCTTY)) == -1) {
151 close(*amaster);
152 return (-1);
153 }
154 return (0);
155 }
156 return (-1);
157
158#else
159 /* BSD-style pty code. */
160 char ptbuf[64], ttbuf[64];
161 int i;
162 const char *ptymajors = "pqrstuvwxyzabcdefghijklmno"
163 "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
164 const char *ptyminors = "0123456789abcdef";
165 int num_minors = strlen(ptyminors);
166 int num_ptys = strlen(ptymajors) * num_minors;
167 struct termios tio;
168
169 for (i = 0; i < num_ptys; i++) {
170 snprintf(ptbuf, sizeof(ptbuf), "/dev/pty%c%c",
171 ptymajors[i / num_minors], ptyminors[i % num_minors]);
172 snprintf(ttbuf, sizeof(ttbuf), "/dev/tty%c%c",
173 ptymajors[i / num_minors], ptyminors[i % num_minors]);
174
175 if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) {
176 /* Try SCO style naming */
177 snprintf(ptbuf, sizeof(ptbuf), "/dev/ptyp%d", i);
178 snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%d", i);
179 if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1)
180 continue;
181 }
182
183 /* Open the slave side. */
184 if ((*aslave = open(ttbuf, O_RDWR | O_NOCTTY)) == -1) {
185 close(*amaster);
186 return (-1);
187 }
188 /* set tty modes to a sane state for broken clients */
189 if (tcgetattr(*amaster, &tio) != -1) {
190 tio.c_lflag |= (ECHO | ISIG | ICANON);
191 tio.c_oflag |= (OPOST | ONLCR);
192 tio.c_iflag |= ICRNL;
193 tcsetattr(*amaster, TCSANOW, &tio);
194 }
195
196 return (0);
197 }
198 return (-1);
199#endif
200}
201
202#endif /* !defined(HAVE_OPENPTY) */
203