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root |
1.55 |
// This file is part of libptytty. Do not make local modifications. |
2 |
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// http://software.schmorp.de/pkg/libptytty |
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/*----------------------------------------------------------------------* |
5 |
pcg |
1.11 |
* File: ptytty.C |
6 |
pcg |
1.1 |
*----------------------------------------------------------------------* |
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* |
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* All portions of code are copyright by their respective author/s. |
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* Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
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root |
1.71 |
* Copyright (c) 2004-2006 Marc Lehmann <schmorp@schmorp.de> |
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root |
1.58 |
* Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> |
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pcg |
1.1 |
* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*---------------------------------------------------------------------*/ |
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sf-exg |
1.70 |
#include "config.h" |
29 |
root |
1.54 |
|
30 |
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#include "ptytty.h" |
31 |
pcg |
1.1 |
|
32 |
root |
1.40 |
#include <cstdlib> |
33 |
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#include <cstring> |
34 |
root |
1.59 |
#include <csignal> |
35 |
root |
1.40 |
|
36 |
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#include <sys/types.h> |
37 |
root |
1.69 |
#include <sys/stat.h> |
38 |
root |
1.40 |
#include <unistd.h> |
39 |
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#include <fcntl.h> |
40 |
root |
1.31 |
|
41 |
pcg |
1.1 |
#ifdef HAVE_SYS_IOCTL_H |
42 |
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# include <sys/ioctl.h> |
43 |
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#endif |
44 |
ayin |
1.53 |
#if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
45 |
pcg |
1.1 |
# include <sys/stropts.h> /* for I_PUSH */ |
46 |
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#endif |
47 |
root |
1.69 |
#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H) |
48 |
pcg |
1.10 |
# include <stropts.h> |
49 |
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#endif |
50 |
root |
1.31 |
#if defined(HAVE_PTY_H) |
51 |
root |
1.22 |
# include <pty.h> |
52 |
root |
1.31 |
#elif defined(HAVE_LIBUTIL_H) |
53 |
root |
1.16 |
# include <libutil.h> |
54 |
root |
1.31 |
#elif defined(HAVE_UTIL_H) |
55 |
root |
1.17 |
# include <util.h> |
56 |
pcg |
1.1 |
#endif |
57 |
ayin |
1.53 |
#ifdef TTY_GID_SUPPORT |
58 |
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#include <grp.h> |
59 |
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#endif |
60 |
pcg |
1.1 |
|
61 |
root |
1.16 |
#include <cstdio> |
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|
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root |
1.36 |
///////////////////////////////////////////////////////////////////////////// |
64 |
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|
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pcg |
1.1 |
/* ------------------------------------------------------------------------- * |
66 |
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* GET PSEUDO TELETYPE - MASTER AND SLAVE * |
67 |
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* ------------------------------------------------------------------------- */ |
68 |
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/* |
69 |
ayin |
1.64 |
* Returns pty file descriptor, or -1 on failure |
70 |
pcg |
1.1 |
* If successful, ttydev is set to the name of the slave device. |
71 |
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* fd_tty _may_ also be set to an open fd to the slave device |
72 |
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*/ |
73 |
ayin |
1.53 |
#if defined(UNIX98_PTY) |
74 |
root |
1.63 |
|
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static int |
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get_pty (int *fd_tty, char **ttydev) |
77 |
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{ |
78 |
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int pfd; |
79 |
pcg |
1.1 |
|
80 |
ayin |
1.53 |
# if defined(HAVE_GETPT) |
81 |
root |
1.63 |
pfd = getpt(); |
82 |
ayin |
1.53 |
# elif defined(HAVE_POSIX_OPENPT) |
83 |
root |
1.63 |
pfd = posix_openpt (O_RDWR); |
84 |
ayin |
1.44 |
# else |
85 |
root |
1.63 |
pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); |
86 |
ayin |
1.44 |
# endif |
87 |
root |
1.45 |
|
88 |
root |
1.63 |
if (pfd >= 0) |
89 |
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{ |
90 |
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if (grantpt (pfd) == 0 /* change slave permissions */ |
91 |
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&& unlockpt (pfd) == 0) |
92 |
ayin |
1.68 |
{ |
93 |
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/* slave now unlocked */ |
94 |
root |
1.63 |
*ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
95 |
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return pfd; |
96 |
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} |
97 |
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close (pfd); |
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} |
100 |
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101 |
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return -1; |
102 |
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} |
103 |
root |
1.45 |
|
104 |
ayin |
1.53 |
#elif defined(HAVE_OPENPTY) |
105 |
root |
1.45 |
|
106 |
root |
1.63 |
static int |
107 |
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get_pty (int *fd_tty, char **ttydev) |
108 |
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{ |
109 |
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int pfd; |
110 |
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int res; |
111 |
ayin |
1.64 |
|
112 |
ayin |
1.66 |
res = openpty (&pfd, fd_tty, NULL, NULL, NULL); |
113 |
root |
1.63 |
|
114 |
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if (res != -1) |
115 |
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{ |
116 |
ayin |
1.66 |
*ttydev = strdup (ttyname (*fd_tty)); |
117 |
root |
1.63 |
return pfd; |
118 |
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} |
119 |
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120 |
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return -1; |
121 |
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} |
122 |
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123 |
ayin |
1.53 |
#elif defined(HAVE__GETPTY) |
124 |
ayin |
1.44 |
|
125 |
root |
1.63 |
static int |
126 |
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get_pty (int *fd_tty, char **ttydev) |
127 |
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{ |
128 |
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int pfd; |
129 |
ayin |
1.66 |
char *slave; |
130 |
root |
1.63 |
|
131 |
ayin |
1.66 |
slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
132 |
root |
1.63 |
|
133 |
root |
1.69 |
if (slave != NULL) |
134 |
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{ |
135 |
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*ttydev = strdup (slave); |
136 |
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return pfd; |
137 |
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} |
138 |
root |
1.63 |
|
139 |
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return -1; |
140 |
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} |
141 |
root |
1.45 |
|
142 |
ayin |
1.53 |
#else |
143 |
root |
1.45 |
|
144 |
root |
1.63 |
/* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
145 |
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static int |
146 |
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get_pty (int *fd_tty, char **ttydev) |
147 |
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{ |
148 |
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int pfd; |
149 |
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int i; |
150 |
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char pty_name[32]; |
151 |
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char tty_name[32]; |
152 |
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const char *majors = "pqrstuvwxyzabcde"; |
153 |
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const char *minors = "0123456789abcdef"; |
154 |
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155 |
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for (i = 0; i < 256; i++) |
156 |
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{ |
157 |
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snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
158 |
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snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
159 |
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160 |
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if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
161 |
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{ |
162 |
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snprintf(pty_name, 32, "/dev/ptyp%d", i); |
163 |
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snprintf(tty_name, 32, "/dev/ttyp%d", i); |
164 |
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if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
165 |
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continue; |
166 |
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} |
167 |
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168 |
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if (access (tty_name, R_OK | W_OK) == 0) |
169 |
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{ |
170 |
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*ttydev = strdup (tty_name); |
171 |
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return pfd; |
172 |
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} |
173 |
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174 |
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close (pfd); |
175 |
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} |
176 |
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177 |
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return -1; |
178 |
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} |
179 |
ayin |
1.62 |
|
180 |
pcg |
1.1 |
#endif |
181 |
root |
1.45 |
|
182 |
pcg |
1.1 |
/*----------------------------------------------------------------------*/ |
183 |
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/* |
184 |
ayin |
1.64 |
* Returns tty file descriptor, or -1 on failure |
185 |
pcg |
1.1 |
*/ |
186 |
root |
1.16 |
static int |
187 |
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get_tty (char *ttydev) |
188 |
pcg |
1.1 |
{ |
189 |
pcg |
1.4 |
return open (ttydev, O_RDWR | O_NOCTTY, 0); |
190 |
pcg |
1.1 |
} |
191 |
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|
192 |
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/*----------------------------------------------------------------------*/ |
193 |
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/* |
194 |
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* Make our tty a controlling tty so that /dev/tty points to us |
195 |
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*/ |
196 |
root |
1.16 |
static int |
197 |
root |
1.36 |
control_tty (int fd_tty) |
198 |
pcg |
1.1 |
{ |
199 |
ayin |
1.65 |
int fd; |
200 |
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|
201 |
pcg |
1.4 |
setsid (); |
202 |
root |
1.16 |
|
203 |
ayin |
1.53 |
#if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
204 |
pcg |
1.4 |
/* |
205 |
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* Push STREAMS modules: |
206 |
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* ptem: pseudo-terminal hardware emulation module. |
207 |
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* ldterm: standard terminal line discipline. |
208 |
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* ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
209 |
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* |
210 |
pcg |
1.6 |
* After we push the STREAMS modules, the first open () on the slave side |
211 |
pcg |
1.4 |
* (i.e. the next section between the dashes giving us "tty opened OK") |
212 |
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* should make the "ptem" (or "ldterm" depending upon either which OS |
213 |
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* version or which set of manual pages you have) module give us a |
214 |
pcg |
1.6 |
* controlling terminal. We must already have close ()d the master side |
215 |
pcg |
1.4 |
* fd in this child process before we push STREAMS modules on because the |
216 |
pcg |
1.6 |
* documentation is really unclear about whether it is any close () on |
217 |
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* the master side or the last close () - i.e. a proper STREAMS dismantling |
218 |
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* close () - on the master side which causes a hang up to be sent |
219 |
pcg |
1.4 |
* through - Geoff Wing |
220 |
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*/ |
221 |
root |
1.69 |
#if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H) |
222 |
pcg |
1.4 |
if (isastream (fd_tty) == 1) |
223 |
root |
1.47 |
# endif |
224 |
pcg |
1.1 |
{ |
225 |
pcg |
1.4 |
ioctl (fd_tty, I_PUSH, "ptem"); |
226 |
|
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ioctl (fd_tty, I_PUSH, "ldterm"); |
227 |
|
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ioctl (fd_tty, I_PUSH, "ttcompat"); |
228 |
pcg |
1.1 |
} |
229 |
root |
1.47 |
#endif |
230 |
root |
1.45 |
|
231 |
ayin |
1.64 |
#ifdef TIOCSCTTY |
232 |
root |
1.45 |
ioctl (fd_tty, TIOCSCTTY, NULL); |
233 |
ayin |
1.64 |
#else |
234 |
ayin |
1.65 |
fd = open (ttyname (fd_tty), O_RDWR); |
235 |
ayin |
1.64 |
if (fd >= 0) |
236 |
|
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close (fd); |
237 |
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#endif |
238 |
root |
1.45 |
|
239 |
ayin |
1.65 |
fd = open ("/dev/tty", O_WRONLY); |
240 |
pcg |
1.4 |
if (fd < 0) |
241 |
root |
1.56 |
return -1; /* fatal */ |
242 |
root |
1.45 |
|
243 |
pcg |
1.4 |
close (fd); |
244 |
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|
245 |
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return 0; |
246 |
pcg |
1.1 |
} |
247 |
root |
1.16 |
|
248 |
root |
1.36 |
void |
249 |
root |
1.54 |
ptytty::close_tty () |
250 |
root |
1.36 |
{ |
251 |
|
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if (tty < 0) |
252 |
|
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return; |
253 |
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|
254 |
|
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close (tty); |
255 |
|
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tty = -1; |
256 |
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} |
257 |
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|
258 |
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bool |
259 |
root |
1.54 |
ptytty::make_controlling_tty () |
260 |
root |
1.36 |
{ |
261 |
|
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return control_tty (tty) >= 0; |
262 |
|
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} |
263 |
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|
264 |
|
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void |
265 |
root |
1.54 |
ptytty::set_utf8_mode (bool on) |
266 |
root |
1.36 |
{ |
267 |
|
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#ifdef IUTF8 |
268 |
|
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if (pty < 0) |
269 |
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return; |
270 |
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|
271 |
|
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struct termios tio; |
272 |
|
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|
273 |
|
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if (tcgetattr (pty, &tio) != -1) |
274 |
|
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{ |
275 |
|
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tcflag_t new_cflag = tio.c_iflag; |
276 |
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|
277 |
|
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if (on) |
278 |
|
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new_cflag |= IUTF8; |
279 |
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else |
280 |
|
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new_cflag &= ~IUTF8; |
281 |
|
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|
282 |
|
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if (new_cflag != tio.c_iflag) |
283 |
|
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{ |
284 |
|
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tio.c_iflag = new_cflag; |
285 |
|
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tcsetattr (pty, TCSANOW, &tio); |
286 |
|
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} |
287 |
|
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} |
288 |
|
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#endif |
289 |
|
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} |
290 |
|
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|
291 |
root |
1.16 |
static struct ttyconf { |
292 |
|
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gid_t gid; |
293 |
|
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mode_t mode; |
294 |
|
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|
295 |
|
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ttyconf () |
296 |
|
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{ |
297 |
|
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#ifdef TTY_GID_SUPPORT |
298 |
|
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struct group *gr = getgrnam ("tty"); |
299 |
|
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|
300 |
|
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if (gr) |
301 |
ayin |
1.68 |
{ |
302 |
|
|
/* change group ownership of tty to "tty" */ |
303 |
root |
1.16 |
mode = S_IRUSR | S_IWUSR | S_IWGRP; |
304 |
|
|
gid = gr->gr_gid; |
305 |
|
|
} |
306 |
|
|
else |
307 |
ayin |
1.67 |
#endif /* TTY_GID_SUPPORT */ |
308 |
root |
1.16 |
{ |
309 |
|
|
mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
310 |
ayin |
1.48 |
gid = 0; |
311 |
root |
1.16 |
} |
312 |
|
|
} |
313 |
|
|
} ttyconf; |
314 |
|
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|
315 |
root |
1.54 |
ptytty_unix::ptytty_unix () |
316 |
root |
1.16 |
{ |
317 |
|
|
name = 0; |
318 |
root |
1.35 |
#if UTMP_SUPPORT |
319 |
|
|
cmd_pid = 0; |
320 |
|
|
#endif |
321 |
root |
1.16 |
} |
322 |
|
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|
323 |
root |
1.54 |
ptytty_unix::~ptytty_unix () |
324 |
root |
1.16 |
{ |
325 |
root |
1.43 |
#if UTMP_SUPPORT |
326 |
root |
1.35 |
logout (); |
327 |
root |
1.43 |
#endif |
328 |
root |
1.16 |
put (); |
329 |
|
|
} |
330 |
|
|
|
331 |
|
|
void |
332 |
root |
1.54 |
ptytty_unix::put () |
333 |
root |
1.16 |
{ |
334 |
root |
1.63 |
if (name) |
335 |
|
|
{ |
336 |
|
|
chmod (name, RESTORE_TTY_MODE); |
337 |
|
|
chown (name, 0, ttyconf.gid); |
338 |
|
|
} |
339 |
root |
1.16 |
|
340 |
|
|
close_tty (); |
341 |
root |
1.50 |
|
342 |
|
|
if (pty >= 0) |
343 |
|
|
close (pty); |
344 |
|
|
|
345 |
root |
1.16 |
free (name); |
346 |
|
|
|
347 |
|
|
pty = tty = -1; |
348 |
|
|
name = 0; |
349 |
|
|
} |
350 |
|
|
|
351 |
|
|
bool |
352 |
root |
1.54 |
ptytty_unix::get () |
353 |
root |
1.16 |
{ |
354 |
|
|
/* get master (pty) */ |
355 |
|
|
if ((pty = get_pty (&tty, &name)) < 0) |
356 |
|
|
return false; |
357 |
|
|
|
358 |
|
|
fcntl (pty, F_SETFL, O_NONBLOCK); |
359 |
|
|
|
360 |
|
|
/* get slave (tty) */ |
361 |
|
|
if (tty < 0) |
362 |
|
|
{ |
363 |
|
|
#ifndef NO_SETOWNER_TTYDEV |
364 |
ayin |
1.49 |
chown (name, getuid (), ttyconf.gid); /* fail silently */ |
365 |
|
|
chmod (name, ttyconf.mode); |
366 |
|
|
# ifdef HAVE_REVOKE |
367 |
|
|
revoke (name); |
368 |
|
|
# endif |
369 |
root |
1.16 |
#endif |
370 |
|
|
|
371 |
|
|
if ((tty = get_tty (name)) < 0) |
372 |
|
|
{ |
373 |
|
|
put (); |
374 |
|
|
return false; |
375 |
|
|
} |
376 |
|
|
} |
377 |
|
|
|
378 |
|
|
return true; |
379 |
|
|
} |
380 |
|
|
|