1 /*
2 * Please note: this implementation of openpty() is far from complete.
3 * it is just enough for portable OpenSSH's needs.
4 */
5
6 /*
7 * Copyright (c) 2004 Damien Miller <djm@mindrot.org>
8 *
9 * 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.
12 *
13 * 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.
20 */
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 #include <sys/types.h>
39
40 #include <stdlib.h>
41
42 #ifdef HAVE_SYS_STAT_H
43 # include <sys/stat.h>
44 #endif
45 #ifdef HAVE_SYS_IOCTL_H
46 # include <sys/ioctl.h>
47 #endif
48
49 #ifdef HAVE_FCNTL_H
50 # include <fcntl.h>
51 #endif
52
53 #ifdef HAVE_UTIL_H
54 # include <util.h>
55 #endif /* HAVE_UTIL_H */
56
57 #ifdef HAVE_PTY_H
58 # include <pty.h>
59 #endif
60 #if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
61 # include <sys/stropts.h>
62 #endif
63
64 #include <signal.h>
65 #include <string.h>
66 #include <unistd.h>
67
68 #ifndef O_NOCTTY
69 #define O_NOCTTY 0
70 #endif
71
72 int
openpty(int * amaster,int * aslave,char * name,struct termios * termp,struct winsize * winp)73 openpty(int *amaster, int *aslave, char *name, struct termios *termp,
74 struct winsize *winp)
75 {
76 #if defined(HAVE__GETPTY)
77 /*
78 * _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more
79 * pty's automagically when needed
80 */
81 char *slave;
82
83 if ((slave = _getpty(amaster, O_RDWR, 0622, 0)) == NULL)
84 return (-1);
85
86 /* Open the slave side. */
87 if ((*aslave = open(slave, O_RDWR | O_NOCTTY)) == -1) {
88 close(*amaster);
89 return (-1);
90 }
91 return (0);
92
93 #elif defined(HAVE_DEV_PTMX)
94 /*
95 * This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3
96 * also has bsd-style ptys, but they simply do not work.)
97 */
98 int ptm;
99 char *pts;
100 mysig_t old_signal;
101
102 if ((ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY)) == -1)
103 return (-1);
104
105 /* XXX: need to close ptm on error? */
106 old_signal = signal(SIGCHLD, SIG_DFL);
107 if (grantpt(ptm) < 0)
108 return (-1);
109 signal(SIGCHLD, old_signal);
110
111 if (unlockpt(ptm) < 0)
112 return (-1);
113
114 if ((pts = ptsname(ptm)) == NULL)
115 return (-1);
116 *amaster = ptm;
117
118 /* Open the slave side. */
119 if ((*aslave = open(pts, O_RDWR | O_NOCTTY)) == -1) {
120 close(*amaster);
121 return (-1);
122 }
123
124 #ifndef ANDROID
125 /*
126 * Try to push the appropriate streams modules, as described
127 * in Solaris pts(7).
128 */
129 ioctl(*aslave, I_PUSH, "ptem");
130 ioctl(*aslave, I_PUSH, "ldterm");
131 # ifndef __hpux
132 ioctl(*aslave, I_PUSH, "ttcompat");
133 # endif /* __hpux */
134 #endif /* ANDROID */
135
136 return (0);
137
138 #elif defined(HAVE_DEV_PTS_AND_PTC)
139 /* AIX-style pty code. */
140 const char *ttname;
141
142 if ((*amaster = open("/dev/ptc", O_RDWR | O_NOCTTY)) == -1)
143 return (-1);
144 if ((ttname = ttyname(*amaster)) == NULL)
145 return (-1);
146 if ((*aslave = open(ttname, O_RDWR | O_NOCTTY)) == -1) {
147 close(*amaster);
148 return (-1);
149 }
150 return (0);
151
152 #elif defined(_UNICOS)
153 char ptbuf[64], ttbuf[64];
154 int i;
155 int highpty;
156
157 highpty = 128;
158 #ifdef _SC_CRAY_NPTY
159 if ((highpty = sysconf(_SC_CRAY_NPTY)) == -1)
160 highpty = 128;
161 #endif /* _SC_CRAY_NPTY */
162
163 for (i = 0; i < highpty; i++) {
164 snprintf(ptbuf, sizeof(ptbuf), "/dev/pty/%03d", i);
165 snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%03d", i);
166 if ((*amaster = open(ptbuf, O_RDWR|O_NOCTTY)) == -1)
167 continue;
168 /* Open the slave side. */
169 if ((*aslave = open(ttbuf, O_RDWR|O_NOCTTY)) == -1) {
170 close(*amaster);
171 return (-1);
172 }
173 return (0);
174 }
175 return (-1);
176
177 #else
178 /* BSD-style pty code. */
179 char ptbuf[64], ttbuf[64];
180 int i;
181 const char *ptymajors = "pqrstuvwxyzabcdefghijklmno"
182 "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
183 const char *ptyminors = "0123456789abcdef";
184 int num_minors = strlen(ptyminors);
185 int num_ptys = strlen(ptymajors) * num_minors;
186 struct termios tio;
187
188 for (i = 0; i < num_ptys; i++) {
189 snprintf(ptbuf, sizeof(ptbuf), "/dev/pty%c%c",
190 ptymajors[i / num_minors], ptyminors[i % num_minors]);
191 snprintf(ttbuf, sizeof(ttbuf), "/dev/tty%c%c",
192 ptymajors[i / num_minors], ptyminors[i % num_minors]);
193
194 if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) {
195 /* Try SCO style naming */
196 snprintf(ptbuf, sizeof(ptbuf), "/dev/ptyp%d", i);
197 snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%d", i);
198 if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1)
199 continue;
200 }
201
202 /* Open the slave side. */
203 if ((*aslave = open(ttbuf, O_RDWR | O_NOCTTY)) == -1) {
204 close(*amaster);
205 return (-1);
206 }
207 /* set tty modes to a sane state for broken clients */
208 if (tcgetattr(*amaster, &tio) != -1) {
209 tio.c_lflag |= (ECHO | ISIG | ICANON);
210 tio.c_oflag |= (OPOST | ONLCR);
211 tio.c_iflag |= ICRNL;
212 tcsetattr(*amaster, TCSANOW, &tio);
213 }
214
215 return (0);
216 }
217 return (-1);
218 #endif
219 }
220
221 #endif /* !defined(HAVE_OPENPTY) */
222
223