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cdd66111 | 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 | #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 | ||
53 | int | |
54 | openpty(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 | ||
cdd66111 | 105 | /* |
106 | * Try to push the appropriate streams modules, as described | |
107 | * in Solaris pts(7). | |
108 | */ | |
109 | ioctl(*aslave, I_PUSH, "ptem"); | |
110 | ioctl(*aslave, I_PUSH, "ldterm"); | |
111 | # ifndef __hpux | |
112 | ioctl(*aslave, I_PUSH, "ttcompat"); | |
113 | # endif /* __hpux */ | |
cdd66111 | 114 | |
115 | return (0); | |
116 | ||
117 | #elif defined(HAVE_DEV_PTS_AND_PTC) | |
118 | /* AIX-style pty code. */ | |
119 | const char *ttname; | |
120 | ||
121 | if ((*amaster = open("/dev/ptc", O_RDWR | O_NOCTTY)) == -1) | |
122 | return (-1); | |
123 | if ((ttname = ttyname(*amaster)) == NULL) | |
124 | return (-1); | |
125 | if ((*aslave = open(ttname, O_RDWR | O_NOCTTY)) == -1) { | |
126 | close(*amaster); | |
127 | return (-1); | |
128 | } | |
129 | return (0); | |
130 | ||
131 | #elif defined(_UNICOS) | |
132 | char ptbuf[64], ttbuf[64]; | |
133 | int i; | |
134 | int highpty; | |
135 | ||
136 | highpty = 128; | |
137 | #ifdef _SC_CRAY_NPTY | |
138 | if ((highpty = sysconf(_SC_CRAY_NPTY)) == -1) | |
139 | highpty = 128; | |
140 | #endif /* _SC_CRAY_NPTY */ | |
141 | ||
142 | for (i = 0; i < highpty; i++) { | |
143 | snprintf(ptbuf, sizeof(ptbuf), "/dev/pty/%03d", i); | |
144 | snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%03d", i); | |
145 | if ((*amaster = open(ptbuf, O_RDWR|O_NOCTTY)) == -1) | |
146 | continue; | |
147 | /* Open the slave side. */ | |
148 | if ((*aslave = open(ttbuf, O_RDWR|O_NOCTTY)) == -1) { | |
149 | close(*amaster); | |
150 | return (-1); | |
151 | } | |
152 | return (0); | |
153 | } | |
154 | return (-1); | |
155 | ||
156 | #else | |
157 | /* BSD-style pty code. */ | |
158 | char ptbuf[64], ttbuf[64]; | |
159 | int i; | |
160 | const char *ptymajors = "pqrstuvwxyzabcdefghijklmno" | |
161 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; | |
162 | const char *ptyminors = "0123456789abcdef"; | |
163 | int num_minors = strlen(ptyminors); | |
164 | int num_ptys = strlen(ptymajors) * num_minors; | |
165 | struct termios tio; | |
166 | ||
167 | for (i = 0; i < num_ptys; i++) { | |
168 | snprintf(ptbuf, sizeof(ptbuf), "/dev/pty%c%c", | |
169 | ptymajors[i / num_minors], ptyminors[i % num_minors]); | |
170 | snprintf(ttbuf, sizeof(ttbuf), "/dev/tty%c%c", | |
171 | ptymajors[i / num_minors], ptyminors[i % num_minors]); | |
172 | ||
173 | if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) { | |
174 | /* Try SCO style naming */ | |
175 | snprintf(ptbuf, sizeof(ptbuf), "/dev/ptyp%d", i); | |
176 | snprintf(ttbuf, sizeof(ttbuf), "/dev/ttyp%d", i); | |
177 | if ((*amaster = open(ptbuf, O_RDWR | O_NOCTTY)) == -1) | |
178 | continue; | |
179 | } | |
180 | ||
181 | /* Open the slave side. */ | |
182 | if ((*aslave = open(ttbuf, O_RDWR | O_NOCTTY)) == -1) { | |
183 | close(*amaster); | |
184 | return (-1); | |
185 | } | |
186 | /* set tty modes to a sane state for broken clients */ | |
187 | if (tcgetattr(*amaster, &tio) != -1) { | |
188 | tio.c_lflag |= (ECHO | ISIG | ICANON); | |
189 | tio.c_oflag |= (OPOST | ONLCR); | |
190 | tio.c_iflag |= ICRNL; | |
191 | tcsetattr(*amaster, TCSANOW, &tio); | |
192 | } | |
193 | ||
194 | return (0); | |
195 | } | |
196 | return (-1); | |
197 | #endif | |
198 | } | |
199 | ||
200 | #endif /* !defined(HAVE_OPENPTY) */ | |
201 |