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a4de1163 | 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. All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
17 | * | |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | /* | |
31 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
32 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
33 | * All rights reserved | |
34 | * Allocating a pseudo-terminal, and making it the controlling tty. | |
35 | * | |
36 | * As far as I am concerned, the code I have written for this software | |
37 | * can be used freely for any purpose. Any derived versions of this | |
38 | * software must be clearly marked as such, and if the derived work is | |
39 | * incompatible with the protocol description in the RFC file, it must be | |
40 | * called by a name other than "ssh" or "Secure Shell". | |
41 | */ | |
42 | ||
43 | #include "includes.h" | |
44 | #if !defined(HAVE_OPENPTY) | |
45 | ||
46 | #ifdef HAVE_UTIL_H | |
47 | # include <util.h> | |
48 | #endif /* HAVE_UTIL_H */ | |
49 | ||
50 | #ifdef HAVE_PTY_H | |
51 | # include <pty.h> | |
52 | #endif | |
53 | #if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) | |
54 | # include <sys/stropts.h> | |
55 | #endif | |
56 | ||
57 | #ifndef O_NOCTTY | |
58 | #define O_NOCTTY 0 | |
59 | #endif | |
60 | ||
61 | int | |
62 | openpty(int *amaster, int *aslave, char *name, struct termios *termp, | |
63 | struct winsize *winp) | |
64 | { | |
65 | #if defined(HAVE__GETPTY) | |
66 | /* | |
67 | * _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more | |
68 | * pty's automagically when needed | |
69 | */ | |
70 | char *slave; | |
71 | ||
72 | if ((slave = _getpty(amaster, O_RDWR, 0622, 0)) == NULL) | |
73 | return (-1); | |
74 | ||
75 | /* Open the slave side. */ | |
76 | if ((*aslave = open(slave, O_RDWR | O_NOCTTY)) == -1) { | |
77 | close(*amaster); | |
78 | return (-1); | |
79 | } | |
80 | return (0); | |
81 | ||
82 | #elif defined(HAVE_DEV_PTMX) | |
83 | /* | |
84 | * This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3 | |
85 | * also has bsd-style ptys, but they simply do not work.) | |
86 | */ | |
87 | int ptm; | |
88 | char *pts; | |
89 | mysig_t old_signal; | |
90 | ||
91 | if ((ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY)) == -1) | |
92 | return (-1); | |
93 | ||
94 | /* XXX: need to close ptm on error? */ | |
95 | old_signal = signal(SIGCHLD, SIG_DFL); | |
96 | if (grantpt(ptm) < 0) | |
97 | return (-1); | |
98 | signal(SIGCHLD, old_signal); | |
99 | ||
100 | if (unlockpt(ptm) < 0) | |
101 | return (-1); | |
102 | ||
103 | if ((pts = ptsname(ptm)) == NULL) | |
104 | return (-1); | |
105 | *amaster = ptm; | |
106 | ||
107 | /* Open the slave side. */ | |
108 | if ((*aslave = open(pts, O_RDWR | O_NOCTTY)) == -1) { | |
109 | close(*amaster); | |
110 | return (-1); | |
111 | } | |
112 | ||
113 | #ifndef HAVE_CYGWIN | |
114 | /* | |
115 | * Try to push the appropriate streams modules, as described | |
116 | * in Solaris pts(7). | |
117 | */ | |
118 | ioctl(*aslave, I_PUSH, "ptem"); | |
119 | ioctl(*aslave, I_PUSH, "ldterm"); | |
120 | # ifndef __hpux | |
121 | ioctl(*aslave, I_PUSH, "ttcompat"); | |
122 | # endif /* __hpux */ | |
123 | #endif /* HAVE_CYGWIN */ | |
124 | ||
125 | return (0); | |
126 | ||
127 | #elif defined(HAVE_DEV_PTS_AND_PTC) | |
128 | /* AIX-style pty code. */ | |
129 | const char *ttname; | |
130 | ||
131 | if ((*amaster = open("/dev/ptc", O_RDWR | O_NOCTTY)) == -1) | |
132 | return (-1); | |
133 | if ((ttname = ttyname(*amaster)) == NULL) | |
134 | return (-1); | |
135 | if ((*aslave = open(ttname, O_RDWR | O_NOCTTY)) == -1) { | |
136 | close(*amaster); | |
137 | return (-1); | |
138 | } | |
139 | return (0); | |
140 | ||
141 | #elif defined(_UNICOS) | |
142 | char ptbuf[64], ttbuf[64]; | |
143 | int i; | |
144 | int highpty; | |
145 | ||
146 | highpty = 128; | |
147 | #ifdef _SC_CRAY_NPTY | |
148 | if ((highpty = sysconf(_SC_CRAY_NPTY)) == -1) | |
149 | highpty = 128; | |
150 | #endif /* _SC_CRAY_NPTY */ | |
151 | ||
152 | for (i = 0; i < highpty; i++) { | |
153 | snprintf(ptbuf, sizeof(ptbuf), "/dev/pty/%03d", i); | |
154 | snprintf(ttbuf, sideof(ttbuf), "/dev/ttyp%03d", i); | |
155 | if ((*amaster = open(ptbuf, O_RDWR|O_NOCTTY)) == -1) | |
156 | continue; | |
157 | /* Open the slave side. */ | |
158 | if ((*aslave = open(ttbuf, O_RDWR|O_NOCTTY)) == -1) { | |
159 | close(*amaster); | |
160 | return (-1); | |
161 | } | |
162 | return (0); | |
163 | } | |
164 | return (-1); | |
165 | ||
166 | #else | |
167 | /* BSD-style pty code. */ | |
168 | char ptbuf[64], ttbuf[64]; | |
169 | int i; | |
170 | const char *ptymajors = "pqrstuvwxyzabcdefghijklmno" | |
171 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; | |
172 | const char *ptyminors = "0123456789abcdef"; | |
173 | int num_minors = strlen(ptyminors); | |
174 | int num_ptys = strlen(ptymajors) * num_minors; | |
175 | struct termios tio; | |
176 | ||
177 | for (i = 0; i < num_ptys; i++) { | |
178 | snprintf(ptbuf, sizeof(ptbuf), "/dev/pty%c%c", | |
179 | ptymajors[i / num_minors], ptyminors[i % num_minors]); | |
180 | snprintf(ttbuf, sizeof(ttbuf), "/dev/tty%c%c", | |
181 | ptymajors[i / num_minors], ptyminors[i % num_minors]); | |
182 | ||
183 | if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) { | |
184 | /* Try SCO style naming */ | |
185 | snprintf(ptbuf, sizeof(ptbuf), "/dev/ptyp%d", i); | |
186 | snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%d", i); | |
187 | if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) | |
188 | continue; | |
189 | } | |
190 | ||
191 | /* Open the slave side. */ | |
192 | if ((*aslave = open(ttbuf, O_RDWR | O_NOCTTY)) == -1) { | |
193 | close(*amaster); | |
194 | return (-1); | |
195 | } | |
196 | /* set tty modes to a sane state for broken clients */ | |
197 | if (tcgetattr(*amaster, &tio) != -1) { | |
198 | tio.c_lflag |= (ECHO | ISIG | ICANON); | |
199 | tio.c_oflag |= (OPOST | ONLCR); | |
200 | tio.c_iflag |= ICRNL; | |
201 | tcsetattr(*amaster, TCSANOW, &tio); | |
202 | } | |
203 | ||
204 | return (0); | |
205 | } | |
206 | return (-1); | |
207 | #endif | |
208 | } | |
209 | ||
210 | #endif /* !defined(HAVE_OPENPTY) */ | |
211 |