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diff --git a/other/openssh-2.1.1p4/pty.c b/other/openssh-2.1.1p4/pty.c
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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"
17RCSID("$OpenBSD: pty.c,v 1.14 2000/06/20 01:39:43 markus Exp $");
18
19#ifdef HAVE_UTIL_H
20# include <util.h>
21#endif /* HAVE_UTIL_H */
22
23#include "pty.h"
24#include "ssh.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#ifdef HAVE_PTY_H
32# include <pty.h>
33#endif
34#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H)
35# include <sys/stropts.h>
36#endif
37
38#ifndef O_NOCTTY
39#define O_NOCTTY 0
40#endif
41
42/*
43 * Allocates and opens a pty. Returns 0 if no pty could be allocated, or
44 * nonzero if a pty was successfully allocated. On success, open file
45 * descriptors for the pty and tty sides and the name of the tty side are
46 * returned (the buffer must be able to hold at least 64 characters).
47 */
48
49int
50pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
51{
52#if defined(HAVE_OPENPTY) || defined(BSD4_4)
53 /* openpty(3) exists in OSF/1 and some other os'es */
54 char buf[64];
55 int i;
56
57 i = openpty(ptyfd, ttyfd, buf, NULL, NULL);
58 if (i < 0) {
59 error("openpty: %.100s", strerror(errno));
60 return 0;
61 }
62 strlcpy(namebuf, buf, namebuflen); /* possible truncation */
63 return 1;
64#else /* HAVE_OPENPTY */
65#ifdef 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 slave = _getpty(ptyfd, O_RDWR, 0622, 0);
73 if (slave == NULL) {
74 error("_getpty: %.100s", strerror(errno));
75 return 0;
76 }
77 strlcpy(namebuf, slave, namebuflen);
78 /* Open the slave side. */
79 *ttyfd = open(namebuf, O_RDWR | O_NOCTTY);
80 if (*ttyfd < 0) {
81 error("%.200s: %.100s", namebuf, strerror(errno));
82 close(*ptyfd);
83 return 0;
84 }
85 return 1;
86#else /* HAVE__GETPTY */
87#if defined(HAVE_DEV_PTMX)
88 /*
89 * This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3
90 * also has bsd-style ptys, but they simply do not work.)
91 */
92 int ptm;
93 char *pts;
94
95 ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY);
96 if (ptm < 0) {
97 error("/dev/ptmx: %.100s", strerror(errno));
98 return 0;
99 }
100 if (grantpt(ptm) < 0) {
101 error("grantpt: %.100s", strerror(errno));
102 return 0;
103 }
104 if (unlockpt(ptm) < 0) {
105 error("unlockpt: %.100s", strerror(errno));
106 return 0;
107 }
108 pts = ptsname(ptm);
109 if (pts == NULL)
110 error("Slave pty side name could not be obtained.");
111 strlcpy(namebuf, pts, namebuflen);
112 *ptyfd = ptm;
113
114 /* Open the slave side. */
115 *ttyfd = open(namebuf, O_RDWR | O_NOCTTY);
116 if (*ttyfd < 0) {
117 error("%.100s: %.100s", namebuf, strerror(errno));
118 close(*ptyfd);
119 return 0;
120 }
121 /* Push the appropriate streams modules, as described in Solaris pts(7). */
122 if (ioctl(*ttyfd, I_PUSH, "ptem") < 0)
123 error("ioctl I_PUSH ptem: %.100s", strerror(errno));
124 if (ioctl(*ttyfd, I_PUSH, "ldterm") < 0)
125 error("ioctl I_PUSH ldterm: %.100s", strerror(errno));
126#ifndef _HPUX_SOURCE
127 if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0)
128 error("ioctl I_PUSH ttcompat: %.100s", strerror(errno));
129#endif
130 return 1;
131#else /* HAVE_DEV_PTMX */
132#ifdef HAVE_DEV_PTS_AND_PTC
133 /* AIX-style pty code. */
134 const char *name;
135
136 *ptyfd = open("/dev/ptc", O_RDWR | O_NOCTTY);
137 if (*ptyfd < 0) {
138 error("Could not open /dev/ptc: %.100s", strerror(errno));
139 return 0;
140 }
141 name = ttyname(*ptyfd);
142 if (!name)
143 fatal("Open of /dev/ptc returns device for which ttyname fails.");
144 strlcpy(namebuf, name, namebuflen);
145 *ttyfd = open(name, O_RDWR | O_NOCTTY);
146 if (*ttyfd < 0) {
147 error("Could not open pty slave side %.100s: %.100s",
148 name, strerror(errno));
149 close(*ptyfd);
150 return 0;
151 }
152 return 1;
153#else /* HAVE_DEV_PTS_AND_PTC */
154 /* BSD-style pty code. */
155 char buf[64];
156 int i;
157 const char *ptymajors = "pqrstuvwxyzabcdefghijklmnoABCDEFGHIJKLMNOPQRSTUVWXYZ";
158 const char *ptyminors = "0123456789abcdef";
159 int num_minors = strlen(ptyminors);
160 int num_ptys = strlen(ptymajors) * num_minors;
161
162 for (i = 0; i < num_ptys; i++) {
163 snprintf(buf, sizeof buf, "/dev/pty%c%c", ptymajors[i / num_minors],
164 ptyminors[i % num_minors]);
165 *ptyfd = open(buf, O_RDWR | O_NOCTTY);
166 if (*ptyfd < 0)
167 continue;
168 snprintf(namebuf, namebuflen, "/dev/tty%c%c",
169 ptymajors[i / num_minors], ptyminors[i % num_minors]);
170
171 /* Open the slave side. */
172 *ttyfd = open(namebuf, O_RDWR | O_NOCTTY);
173 if (*ttyfd < 0) {
174 error("%.100s: %.100s", namebuf, strerror(errno));
175 close(*ptyfd);
176 return 0;
177 }
178 return 1;
179 }
180 return 0;
181#endif /* HAVE_DEV_PTS_AND_PTC */
182#endif /* HAVE_DEV_PTMX */
183#endif /* HAVE__GETPTY */
184#endif /* HAVE_OPENPTY */
185}
186
187/* Releases the tty. Its ownership is returned to root, and permissions to 0666. */
188
189void
190pty_release(const char *ttyname)
191{
192 if (chown(ttyname, (uid_t) 0, (gid_t) 0) < 0)
193 error("chown %.100s 0 0 failed: %.100s", ttyname, strerror(errno));
194 if (chmod(ttyname, (mode_t) 0666) < 0)
195 error("chmod %.100s 0666 failed: %.100s", ttyname, strerror(errno));
196}
197
198/* Makes the tty the processes controlling tty and sets it to sane modes. */
199
200void
201pty_make_controlling_tty(int *ttyfd, const char *ttyname)
202{
203 int fd;
204#ifdef HAVE_VHANGUP
205 void *old;
206#endif /* HAVE_VHANGUP */
207
208 /* First disconnect from the old controlling tty. */
209#ifdef TIOCNOTTY
210 fd = open("/dev/tty", O_RDWR | O_NOCTTY);
211 if (fd >= 0) {
212 (void) ioctl(fd, TIOCNOTTY, NULL);
213 close(fd);
214 }
215#endif /* TIOCNOTTY */
216 if (setsid() < 0)
217 error("setsid: %.100s", strerror(errno));
218
219 /*
220 * Verify that we are successfully disconnected from the controlling
221 * tty.
222 */
223 fd = open("/dev/tty", O_RDWR | O_NOCTTY);
224 if (fd >= 0) {
225 error("Failed to disconnect from controlling tty.");
226 close(fd);
227 }
228 /* Make it our controlling tty. */
229#ifdef TIOCSCTTY
230 debug("Setting controlling tty using TIOCSCTTY.");
231 /*
232 * We ignore errors from this, because HPSUX defines TIOCSCTTY, but
233 * returns EINVAL with these arguments, and there is absolutely no
234 * documentation.
235 */
236 ioctl(*ttyfd, TIOCSCTTY, NULL);
237#endif /* TIOCSCTTY */
238#ifdef HAVE_VHANGUP
239 old = signal(SIGHUP, SIG_IGN);
240 vhangup();
241 signal(SIGHUP, old);
242#endif /* HAVE_VHANGUP */
243 fd = open(ttyname, O_RDWR);
244 if (fd < 0) {
245 error("%.100s: %.100s", ttyname, strerror(errno));
246 } else {
247#ifdef HAVE_VHANGUP
248 close(*ttyfd);
249 *ttyfd = fd;
250#else /* HAVE_VHANGUP */
251 close(fd);
252#endif /* HAVE_VHANGUP */
253 }
254 /* Verify that we now have a controlling tty. */
255 fd = open("/dev/tty", O_WRONLY);
256 if (fd < 0)
257 error("open /dev/tty failed - could not set controlling tty: %.100s",
258 strerror(errno));
259 else {
260 close(fd);
261 }
262}
263
264/* Changes the window size associated with the pty. */
265
266void
267pty_change_window_size(int ptyfd, int row, int col,
268 int xpixel, int ypixel)
269{
270 struct winsize w;
271 w.ws_row = row;
272 w.ws_col = col;
273 w.ws_xpixel = xpixel;
274 w.ws_ypixel = ypixel;
275 (void) ioctl(ptyfd, TIOCSWINSZ, &w);
276}
277
278void
279pty_setowner(struct passwd *pw, const char *ttyname)
280{
281 struct group *grp;
282 gid_t gid;
283 mode_t mode;
284
285 /* Determine the group to make the owner of the tty. */
286 grp = getgrnam("tty");
287 if (grp) {
288 gid = grp->gr_gid;
289 mode = S_IRUSR | S_IWUSR | S_IWGRP;
290 } else {
291 gid = pw->pw_gid;
292 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
293 }
294
295 /* Change ownership of the tty. */
296 if (chown(ttyname, pw->pw_uid, gid) < 0)
297 fatal("chown(%.100s, %d, %d) failed: %.100s",
298 ttyname, pw->pw_uid, gid, strerror(errno));
299 if (chmod(ttyname, mode) < 0)
300 fatal("chmod(%.100s, 0%o) failed: %.100s",
301 ttyname, mode, strerror(errno));
302}