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1 | /* | |
2 | * | |
3 | * pty.c | |
4 | * | |
5 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
6 | * | |
7 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
8 | * All rights reserved | |
9 | * | |
10 | * Created: Fri Mar 17 04:37:25 1995 ylo | |
11 | * | |
12 | * Allocating a pseudo-terminal, and making it the controlling tty. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include "includes.h" | |
17 | RCSID("$Id$"); | |
18 | ||
19 | #include "pty.h" | |
20 | #include "ssh.h" | |
21 | ||
22 | #ifdef HAVE_PTY_H | |
23 | #include <pty.h> | |
24 | #endif /* HAVE_PTY_H */ | |
25 | ||
26 | /* Pty allocated with _getpty gets broken if we do I_PUSH:es to it. */ | |
27 | #if defined(HAVE__GETPTY) || defined(HAVE_OPENPTY) | |
28 | #undef HAVE_DEV_PTMX | |
29 | #endif | |
30 | ||
31 | #ifndef O_NOCTTY | |
32 | #define O_NOCTTY 0 | |
33 | #endif | |
34 | ||
35 | /* | |
36 | * Allocates and opens a pty. Returns 0 if no pty could be allocated, or | |
37 | * nonzero if a pty was successfully allocated. On success, open file | |
38 | * descriptors for the pty and tty sides and the name of the tty side are | |
39 | * returned (the buffer must be able to hold at least 64 characters). | |
40 | */ | |
41 | ||
42 | int | |
43 | pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen) | |
44 | { | |
45 | #if defined(HAVE_OPENPTY) || defined(BSD4_4) | |
46 | /* openpty(3) exists in OSF/1 and some other os'es */ | |
47 | char buf[64]; | |
48 | int i; | |
49 | ||
50 | i = openpty(ptyfd, ttyfd, buf, NULL, NULL); | |
51 | if (i < 0) { | |
52 | error("openpty: %.100s", strerror(errno)); | |
53 | return 0; | |
54 | } | |
55 | strlcpy(namebuf, buf, namebuflen); /* possible truncation */ | |
56 | return 1; | |
57 | #else /* HAVE_OPENPTY */ | |
58 | #ifdef HAVE__GETPTY | |
59 | /* | |
60 | * _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more | |
61 | * pty's automagically when needed | |
62 | */ | |
63 | char *slave; | |
64 | ||
65 | slave = _getpty(ptyfd, O_RDWR, 0622, 0); | |
66 | if (slave == NULL) { | |
67 | error("_getpty: %.100s", strerror(errno)); | |
68 | return 0; | |
69 | } | |
70 | strlcpy(namebuf, slave, namebuflen); | |
71 | /* Open the slave side. */ | |
72 | *ttyfd = open(namebuf, O_RDWR | O_NOCTTY); | |
73 | if (*ttyfd < 0) { | |
74 | error("%.200s: %.100s", namebuf, strerror(errno)); | |
75 | close(*ptyfd); | |
76 | return 0; | |
77 | } | |
78 | return 1; | |
79 | #else /* HAVE__GETPTY */ | |
80 | #ifdef HAVE_DEV_PTMX | |
81 | /* | |
82 | * This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3 | |
83 | * also has bsd-style ptys, but they simply do not work.) | |
84 | */ | |
85 | int ptm; | |
86 | char *pts; | |
87 | ||
88 | ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY); | |
89 | if (ptm < 0) { | |
90 | error("/dev/ptmx: %.100s", strerror(errno)); | |
91 | return 0; | |
92 | } | |
93 | if (grantpt(ptm) < 0) { | |
94 | error("grantpt: %.100s", strerror(errno)); | |
95 | return 0; | |
96 | } | |
97 | if (unlockpt(ptm) < 0) { | |
98 | error("unlockpt: %.100s", strerror(errno)); | |
99 | return 0; | |
100 | } | |
101 | pts = ptsname(ptm); | |
102 | if (pts == NULL) | |
103 | error("Slave pty side name could not be obtained."); | |
104 | strlcpy(namebuf, pts, namebuflen); | |
105 | *ptyfd = ptm; | |
106 | ||
107 | /* Open the slave side. */ | |
108 | *ttyfd = open(namebuf, O_RDWR | O_NOCTTY); | |
109 | if (*ttyfd < 0) { | |
110 | error("%.100s: %.100s", namebuf, strerror(errno)); | |
111 | close(*ptyfd); | |
112 | return 0; | |
113 | } | |
114 | /* Push the appropriate streams modules, as described in Solaris pts(7). */ | |
115 | if (ioctl(*ttyfd, I_PUSH, "ptem") < 0) | |
116 | error("ioctl I_PUSH ptem: %.100s", strerror(errno)); | |
117 | if (ioctl(*ttyfd, I_PUSH, "ldterm") < 0) | |
118 | error("ioctl I_PUSH ldterm: %.100s", strerror(errno)); | |
119 | if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0) | |
120 | error("ioctl I_PUSH ttcompat: %.100s", strerror(errno)); | |
121 | return 1; | |
122 | #else /* HAVE_DEV_PTMX */ | |
123 | #ifdef HAVE_DEV_PTS_AND_PTC | |
124 | /* AIX-style pty code. */ | |
125 | const char *name; | |
126 | ||
127 | *ptyfd = open("/dev/ptc", O_RDWR | O_NOCTTY); | |
128 | if (*ptyfd < 0) { | |
129 | error("Could not open /dev/ptc: %.100s", strerror(errno)); | |
130 | return 0; | |
131 | } | |
132 | name = ttyname(*ptyfd); | |
133 | if (!name) | |
134 | fatal("Open of /dev/ptc returns device for which ttyname fails."); | |
135 | strlcpy(namebuf, name, namebuflen); | |
136 | *ttyfd = open(name, O_RDWR | O_NOCTTY); | |
137 | if (*ttyfd < 0) { | |
138 | error("Could not open pty slave side %.100s: %.100s", | |
139 | name, strerror(errno)); | |
140 | close(*ptyfd); | |
141 | return 0; | |
142 | } | |
143 | return 1; | |
144 | #else /* HAVE_DEV_PTS_AND_PTC */ | |
145 | /* BSD-style pty code. */ | |
146 | char buf[64]; | |
147 | int i; | |
148 | const char *ptymajors = "pqrstuvwxyzabcdefghijklmnoABCDEFGHIJKLMNOPQRSTUVWXYZ"; | |
149 | const char *ptyminors = "0123456789abcdef"; | |
150 | int num_minors = strlen(ptyminors); | |
151 | int num_ptys = strlen(ptymajors) * num_minors; | |
152 | ||
153 | for (i = 0; i < num_ptys; i++) { | |
154 | snprintf(buf, sizeof buf, "/dev/pty%c%c", ptymajors[i / num_minors], | |
155 | ptyminors[i % num_minors]); | |
156 | *ptyfd = open(buf, O_RDWR | O_NOCTTY); | |
157 | if (*ptyfd < 0) | |
158 | continue; | |
159 | snprintf(namebuf, sizeof namebuflen, "/dev/tty%c%c", | |
160 | ptymajors[i / num_minors], ptyminors[i % num_minors]); | |
161 | ||
162 | /* Open the slave side. */ | |
163 | *ttyfd = open(namebuf, O_RDWR | O_NOCTTY); | |
164 | if (*ttyfd < 0) { | |
165 | error("%.100s: %.100s", namebuf, strerror(errno)); | |
166 | close(*ptyfd); | |
167 | return 0; | |
168 | } | |
169 | return 1; | |
170 | } | |
171 | return 0; | |
172 | #endif /* HAVE_DEV_PTS_AND_PTC */ | |
173 | #endif /* HAVE_DEV_PTMX */ | |
174 | #endif /* HAVE__GETPTY */ | |
175 | #endif /* HAVE_OPENPTY */ | |
176 | } | |
177 | ||
178 | /* Releases the tty. Its ownership is returned to root, and permissions to 0666. */ | |
179 | ||
180 | void | |
181 | pty_release(const char *ttyname) | |
182 | { | |
183 | if (chown(ttyname, (uid_t) 0, (gid_t) 0) < 0) | |
184 | debug("chown %.100s 0 0 failed: %.100s", ttyname, strerror(errno)); | |
185 | if (chmod(ttyname, (mode_t) 0666) < 0) | |
186 | debug("chmod %.100s 0666 failed: %.100s", ttyname, strerror(errno)); | |
187 | } | |
188 | ||
189 | /* Makes the tty the processes controlling tty and sets it to sane modes. */ | |
190 | ||
191 | void | |
192 | pty_make_controlling_tty(int *ttyfd, const char *ttyname) | |
193 | { | |
194 | int fd; | |
195 | ||
196 | /* First disconnect from the old controlling tty. */ | |
197 | #ifdef TIOCNOTTY | |
198 | fd = open("/dev/tty", O_RDWR | O_NOCTTY); | |
199 | if (fd >= 0) { | |
200 | (void) ioctl(fd, TIOCNOTTY, NULL); | |
201 | close(fd); | |
202 | } | |
203 | #endif /* TIOCNOTTY */ | |
204 | if (setsid() < 0) | |
205 | error("setsid: %.100s", strerror(errno)); | |
206 | ||
207 | /* | |
208 | * Verify that we are successfully disconnected from the controlling | |
209 | * tty. | |
210 | */ | |
211 | fd = open("/dev/tty", O_RDWR | O_NOCTTY); | |
212 | if (fd >= 0) { | |
213 | error("Failed to disconnect from controlling tty."); | |
214 | close(fd); | |
215 | } | |
216 | /* Make it our controlling tty. */ | |
217 | #ifdef TIOCSCTTY | |
218 | debug("Setting controlling tty using TIOCSCTTY."); | |
219 | /* | |
220 | * We ignore errors from this, because HPSUX defines TIOCSCTTY, but | |
221 | * returns EINVAL with these arguments, and there is absolutely no | |
222 | * documentation. | |
223 | */ | |
224 | ioctl(*ttyfd, TIOCSCTTY, NULL); | |
225 | #endif /* TIOCSCTTY */ | |
226 | fd = open(ttyname, O_RDWR); | |
227 | if (fd < 0) | |
228 | error("%.100s: %.100s", ttyname, strerror(errno)); | |
229 | else | |
230 | close(fd); | |
231 | ||
232 | /* Verify that we now have a controlling tty. */ | |
233 | fd = open("/dev/tty", O_WRONLY); | |
234 | if (fd < 0) | |
235 | error("open /dev/tty failed - could not set controlling tty: %.100s", | |
236 | strerror(errno)); | |
237 | else { | |
238 | close(fd); | |
239 | } | |
240 | } | |
241 | ||
242 | /* Changes the window size associated with the pty. */ | |
243 | ||
244 | void | |
245 | pty_change_window_size(int ptyfd, int row, int col, | |
246 | int xpixel, int ypixel) | |
247 | { | |
248 | struct winsize w; | |
249 | w.ws_row = row; | |
250 | w.ws_col = col; | |
251 | w.ws_xpixel = xpixel; | |
252 | w.ws_ypixel = ypixel; | |
253 | (void) ioctl(ptyfd, TIOCSWINSZ, &w); | |
254 | } |