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1 | // This file is part of libptytty. Do not make local modifications. |
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2 | // http://software.schmorp.de/pkg/libptytty |
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3 | |
1 | /*--------------------------------*-C-*---------------------------------* |
4 | /*----------------------------------------------------------------------* |
2 | * File: ptytty.C |
5 | * File: ptytty.C |
3 | *----------------------------------------------------------------------* |
6 | *----------------------------------------------------------------------* |
4 | * |
7 | * |
5 | * All portions of code are copyright by their respective author/s. |
8 | * All portions of code are copyright by their respective author/s. |
6 | * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
9 | * Copyright (c) 1999-2001 Geoff Wing <gcw@pobox.com> |
7 | * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
10 | * Copyright (c) 2004-2006 Marc Lehmann <pcg@goof.com> |
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11 | * Copyright (c) 2006 Emanuele Giaquinta <e.giaquinta@glauco.it> |
8 | * |
12 | * |
9 | * This program is free software; you can redistribute it and/or modify |
13 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License as published by |
14 | * it under the terms of the GNU General Public License as published by |
11 | * the Free Software Foundation; either version 2 of the License, or |
15 | * the Free Software Foundation; either version 2 of the License, or |
12 | * (at your option) any later version. |
16 | * (at your option) any later version. |
… | |
… | |
19 | * You should have received a copy of the GNU General Public License |
23 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
24 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
22 | *---------------------------------------------------------------------*/ |
26 | *---------------------------------------------------------------------*/ |
23 | |
27 | |
24 | #include "../config.h" /* NECESSARY */ |
28 | #include "config.h" |
25 | |
29 | |
26 | #include "fdpass.h" |
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27 | #include "ptytty.h" |
30 | #include "ptytty.h" |
28 | |
31 | |
29 | #include <cstdlib> |
32 | #include <cstdlib> |
30 | #include <cstring> |
33 | #include <cstring> |
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34 | #include <csignal> |
31 | |
35 | |
32 | #include <sys/types.h> |
36 | #include <sys/types.h> |
33 | #include <sys/socket.h> |
37 | #include <sys/stat.h> |
34 | #include <unistd.h> |
38 | #include <unistd.h> |
35 | #include <fcntl.h> |
39 | #include <fcntl.h> |
36 | |
40 | |
37 | #ifdef HAVE_SYS_IOCTL_H |
41 | #ifdef HAVE_SYS_IOCTL_H |
38 | # include <sys/ioctl.h> |
42 | # include <sys/ioctl.h> |
39 | #endif |
43 | #endif |
40 | #if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
44 | #if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
41 | # include <sys/stropts.h> /* for I_PUSH */ |
45 | # include <sys/stropts.h> /* for I_PUSH */ |
42 | #endif |
46 | #endif |
43 | #ifdef HAVE_ISASTREAM |
47 | #if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H) |
44 | # include <stropts.h> |
48 | # include <stropts.h> |
45 | #endif |
49 | #endif |
46 | #if defined(HAVE_PTY_H) |
50 | #if defined(HAVE_PTY_H) |
47 | # include <pty.h> |
51 | # include <pty.h> |
48 | #elif defined(HAVE_LIBUTIL_H) |
52 | #elif defined(HAVE_LIBUTIL_H) |
… | |
… | |
60 | |
64 | |
61 | /* ------------------------------------------------------------------------- * |
65 | /* ------------------------------------------------------------------------- * |
62 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
66 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
63 | * ------------------------------------------------------------------------- */ |
67 | * ------------------------------------------------------------------------- */ |
64 | /* |
68 | /* |
65 | * Returns pty file descriptor, or -1 on failure |
69 | * Returns pty file descriptor, or -1 on failure |
66 | * If successful, ttydev is set to the name of the slave device. |
70 | * If successful, ttydev is set to the name of the slave device. |
67 | * fd_tty _may_ also be set to an open fd to the slave device |
71 | * fd_tty _may_ also be set to an open fd to the slave device |
68 | */ |
72 | */ |
69 | #if defined(UNIX98_PTY) |
73 | #if defined(UNIX98_PTY) |
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74 | |
70 | static int |
75 | static int |
71 | get_pty (int *fd_tty, char **ttydev) |
76 | get_pty (int *fd_tty, char **ttydev) |
72 | { |
77 | { |
73 | int pfd; |
78 | int pfd; |
74 | |
79 | |
75 | # if defined(HAVE_GETPT) |
80 | # if defined(HAVE_GETPT) |
76 | pfd = getpt(); |
81 | pfd = getpt(); |
77 | # elif defined(HAVE_POSIX_OPENPT) |
82 | # elif defined(HAVE_POSIX_OPENPT) |
78 | pfd = posix_openpt (O_RDWR); |
83 | pfd = posix_openpt (O_RDWR); |
79 | # else |
84 | # else |
80 | pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); |
85 | pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); |
81 | # endif |
86 | # endif |
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87 | |
82 | if (pfd >= 0) |
88 | if (pfd >= 0) |
83 | { |
89 | { |
84 | if (grantpt (pfd) == 0 /* change slave permissions */ |
90 | if (grantpt (pfd) == 0 /* change slave permissions */ |
85 | && unlockpt (pfd) == 0) |
91 | && unlockpt (pfd) == 0) |
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92 | { |
86 | { /* slave now unlocked */ |
93 | /* slave now unlocked */ |
87 | *ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
94 | *ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
88 | return pfd; |
95 | return pfd; |
89 | } |
96 | } |
90 | |
97 | |
91 | close (pfd); |
98 | close (pfd); |
92 | } |
99 | } |
93 | |
100 | |
94 | return -1; |
101 | return -1; |
95 | } |
102 | } |
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103 | |
96 | #elif defined(HAVE_OPENPTY) |
104 | #elif defined(HAVE_OPENPTY) |
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105 | |
97 | static int |
106 | static int |
98 | get_pty (int *fd_tty, char **ttydev) |
107 | get_pty (int *fd_tty, char **ttydev) |
99 | { |
108 | { |
100 | int pfd; |
109 | int pfd; |
101 | int res; |
110 | int res; |
102 | char tty_name[32]; |
111 | |
103 | |
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104 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
112 | res = openpty (&pfd, fd_tty, NULL, NULL, NULL); |
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113 | |
105 | if (res != -1) |
114 | if (res != -1) |
106 | { |
115 | { |
107 | *ttydev = strdup (tty_name); |
116 | *ttydev = strdup (ttyname (*fd_tty)); |
108 | return pfd; |
117 | return pfd; |
109 | } |
118 | } |
110 | |
119 | |
111 | return -1; |
120 | return -1; |
112 | } |
121 | } |
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122 | |
113 | #elif defined(HAVE__GETPTY) |
123 | #elif defined(HAVE__GETPTY) |
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124 | |
114 | static int |
125 | static int |
115 | get_pty (int *fd_tty, char **ttydev) |
126 | get_pty (int *fd_tty, char **ttydev) |
116 | { |
127 | { |
117 | int pfd; |
128 | int pfd; |
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129 | char *slave; |
118 | |
130 | |
119 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
131 | slave = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
120 | if (*ttydev != NULL) |
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121 | return pfd; |
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122 | |
132 | |
123 | return -1; |
133 | if (slave != NULL) |
124 | } |
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125 | #elif defined(HAVE_DEV_PTC) |
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126 | static int |
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127 | get_pty (int *fd_tty, char **ttydev) |
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128 | { |
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129 | int pfd; |
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130 | |
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131 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
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132 | { |
134 | { |
133 | *ttydev = strdup (ttyname (pfd)); |
135 | *ttydev = strdup (slave); |
134 | return pfd; |
136 | return pfd; |
135 | } |
137 | } |
136 | |
138 | |
137 | return -1; |
139 | return -1; |
138 | } |
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139 | #elif defined(HAVE_DEV_CLONE) |
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140 | static int |
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141 | get_pty (int *fd_tty, char **ttydev) |
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142 | { |
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143 | int pfd; |
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144 | |
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145 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
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146 | { |
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147 | *ttydev = strdup (ptsname (pfd)); |
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148 | return pfd; |
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149 | } |
140 | } |
150 | |
141 | |
151 | return -1; |
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152 | } |
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153 | #else |
142 | #else |
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143 | |
154 | /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
144 | /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
155 | static int |
145 | static int |
156 | get_pty (int *fd_tty, char **ttydev) |
146 | get_pty (int *fd_tty, char **ttydev) |
157 | { |
147 | { |
158 | int pfd; |
148 | int pfd; |
159 | int i; |
149 | int i; |
160 | char pty_name[32]; |
150 | char pty_name[32]; |
161 | char tty_name[32]; |
151 | char tty_name[32]; |
162 | const char *majors = "pqrstuvwxyzabcde"; |
152 | const char *majors = "pqrstuvwxyzabcde"; |
163 | const char *minors = "0123456789abcdef"; |
153 | const char *minors = "0123456789abcdef"; |
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154 | |
164 | for (i = 0; i < 256; i++) |
155 | for (i = 0; i < 256; i++) |
165 | { |
156 | { |
166 | snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
157 | snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
167 | snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
158 | snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
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159 | |
168 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
160 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
169 | { |
161 | { |
170 | snprintf(pty_name, 32, "/dev/ptyp%d", i); |
162 | snprintf(pty_name, 32, "/dev/ptyp%d", i); |
171 | snprintf(tty_name, 32, "/dev/ttyp%d", i); |
163 | snprintf(tty_name, 32, "/dev/ttyp%d", i); |
172 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
164 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
173 | continue; |
165 | continue; |
174 | } |
166 | } |
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167 | |
175 | if (access (tty_name, R_OK | W_OK) == 0) |
168 | if (access (tty_name, R_OK | W_OK) == 0) |
176 | { |
169 | { |
177 | *ttydev = strdup (tty_name); |
170 | *ttydev = strdup (tty_name); |
178 | return pfd; |
171 | return pfd; |
179 | } |
172 | } |
180 | |
173 | |
181 | close (pfd); |
174 | close (pfd); |
182 | } |
175 | } |
183 | } |
176 | |
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177 | return -1; |
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178 | } |
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179 | |
184 | #endif |
180 | #endif |
185 | |
181 | |
186 | /*----------------------------------------------------------------------*/ |
182 | /*----------------------------------------------------------------------*/ |
187 | /* |
183 | /* |
188 | * Returns tty file descriptor, or -1 on failure |
184 | * Returns tty file descriptor, or -1 on failure |
189 | */ |
185 | */ |
190 | static int |
186 | static int |
191 | get_tty (char *ttydev) |
187 | get_tty (char *ttydev) |
192 | { |
188 | { |
193 | return open (ttydev, O_RDWR | O_NOCTTY, 0); |
189 | return open (ttydev, O_RDWR | O_NOCTTY, 0); |
… | |
… | |
198 | * Make our tty a controlling tty so that /dev/tty points to us |
194 | * Make our tty a controlling tty so that /dev/tty points to us |
199 | */ |
195 | */ |
200 | static int |
196 | static int |
201 | control_tty (int fd_tty) |
197 | control_tty (int fd_tty) |
202 | { |
198 | { |
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199 | int fd; |
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200 | |
203 | setsid (); |
201 | setsid (); |
204 | |
202 | |
205 | #if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
203 | #if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
206 | /* |
204 | /* |
207 | * Push STREAMS modules: |
205 | * Push STREAMS modules: |
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… | |
218 | * documentation is really unclear about whether it is any close () on |
216 | * documentation is really unclear about whether it is any close () on |
219 | * the master side or the last close () - i.e. a proper STREAMS dismantling |
217 | * the master side or the last close () - i.e. a proper STREAMS dismantling |
220 | * close () - on the master side which causes a hang up to be sent |
218 | * close () - on the master side which causes a hang up to be sent |
221 | * through - Geoff Wing |
219 | * through - Geoff Wing |
222 | */ |
220 | */ |
223 | # ifdef HAVE_ISASTREAM |
221 | #if defined(HAVE_ISASTREAM) && defined(HAVE_STROPTS_H) |
224 | if (isastream (fd_tty) == 1) |
222 | if (isastream (fd_tty) == 1) |
225 | # endif |
223 | # endif |
226 | { |
224 | { |
227 | ioctl (fd_tty, I_PUSH, "ptem"); |
225 | ioctl (fd_tty, I_PUSH, "ptem"); |
228 | ioctl (fd_tty, I_PUSH, "ldterm"); |
226 | ioctl (fd_tty, I_PUSH, "ldterm"); |
229 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
227 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
230 | } |
228 | } |
231 | #endif |
229 | #endif |
232 | |
230 | |
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231 | #ifdef TIOCSCTTY |
233 | ioctl (fd_tty, TIOCSCTTY, NULL); |
232 | ioctl (fd_tty, TIOCSCTTY, NULL); |
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233 | #else |
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234 | fd = open (ttyname (fd_tty), O_RDWR); |
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235 | if (fd >= 0) |
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236 | close (fd); |
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237 | #endif |
234 | |
238 | |
235 | int fd = open ("/dev/tty", O_WRONLY); |
239 | fd = open ("/dev/tty", O_WRONLY); |
236 | if (fd < 0) |
240 | if (fd < 0) |
237 | return -1; /* fatal */ |
241 | return -1; /* fatal */ |
238 | |
242 | |
239 | close (fd); |
243 | close (fd); |
240 | |
244 | |
241 | return 0; |
245 | return 0; |
242 | } |
246 | } |
… | |
… | |
292 | { |
296 | { |
293 | #ifdef TTY_GID_SUPPORT |
297 | #ifdef TTY_GID_SUPPORT |
294 | struct group *gr = getgrnam ("tty"); |
298 | struct group *gr = getgrnam ("tty"); |
295 | |
299 | |
296 | if (gr) |
300 | if (gr) |
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301 | { |
297 | { /* change group ownership of tty to "tty" */ |
302 | /* change group ownership of tty to "tty" */ |
298 | mode = S_IRUSR | S_IWUSR | S_IWGRP; |
303 | mode = S_IRUSR | S_IWUSR | S_IWGRP; |
299 | gid = gr->gr_gid; |
304 | gid = gr->gr_gid; |
300 | } |
305 | } |
301 | else |
306 | else |
302 | #endif /* TTY_GID_SUPPORT */ |
307 | #endif /* TTY_GID_SUPPORT */ |
303 | { |
308 | { |
304 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
309 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
305 | gid = 0; |
310 | gid = 0; |
306 | } |
311 | } |
307 | } |
312 | } |
… | |
… | |
324 | } |
329 | } |
325 | |
330 | |
326 | void |
331 | void |
327 | ptytty_unix::put () |
332 | ptytty_unix::put () |
328 | { |
333 | { |
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334 | if (name) |
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335 | { |
329 | chmod (name, RESTORE_TTY_MODE); |
336 | chmod (name, RESTORE_TTY_MODE); |
330 | chown (name, 0, ttyconf.gid); |
337 | chown (name, 0, ttyconf.gid); |
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338 | } |
331 | |
339 | |
332 | close_tty (); |
340 | close_tty (); |
333 | |
341 | |
334 | if (pty >= 0) |
342 | if (pty >= 0) |
335 | close (pty); |
343 | close (pty); |
… | |
… | |
368 | } |
376 | } |
369 | |
377 | |
370 | return true; |
378 | return true; |
371 | } |
379 | } |
372 | |
380 | |
373 | #if PTYTTY_HELPER |
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374 | |
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375 | static int sock_fd; |
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376 | static int pid; |
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377 | |
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378 | struct command |
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379 | { |
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380 | enum { get, login, destroy } type; |
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381 | |
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382 | ptytty *id; |
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383 | |
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384 | bool login_shell; |
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385 | int cmd_pid; |
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386 | char hostname[512]; // arbitrary, but should be plenty |
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387 | }; |
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388 | |
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389 | struct ptytty_proxy : ptytty |
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390 | { |
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391 | ptytty *id; |
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392 | |
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393 | ~ptytty_proxy () |
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394 | : id(0) |
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395 | { |
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396 | } |
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397 | |
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398 | ~ptytty_proxy (); |
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399 | |
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400 | bool get (); |
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401 | void login (int cmd_pid, bool login_shell, const char *hostname); |
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402 | }; |
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403 | |
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404 | bool |
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405 | ptytty_proxy::get () |
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406 | { |
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407 | command cmd; |
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408 | |
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409 | cmd.type = command::get; |
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410 | |
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411 | write (sock_fd, &cmd, sizeof (cmd)); |
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412 | |
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413 | if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
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414 | fatal ("protocol error while creating pty using helper process, aborting.\n"); |
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415 | |
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416 | if (!id) |
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417 | return false; |
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418 | |
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419 | if ((pty = ptytty_recv_fd (sock_fd)) < 0 |
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420 | || (tty = ptytty_recv_fd (sock_fd)) < 0) |
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421 | fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
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422 | |
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423 | return true; |
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424 | } |
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425 | |
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426 | void |
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427 | ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
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428 | { |
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429 | command cmd; |
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430 | |
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431 | cmd.type = command::login; |
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432 | cmd.id = id; |
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433 | cmd.cmd_pid = cmd_pid; |
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434 | cmd.login_shell = login_shell; |
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435 | strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
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436 | |
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437 | write (sock_fd, &cmd, sizeof (cmd)); |
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438 | } |
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439 | |
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440 | ptytty_proxy::~ptytty_proxy () |
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441 | { |
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442 | if (id) |
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443 | { |
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444 | command cmd; |
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445 | |
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446 | cmd.type = command::destroy; |
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447 | cmd.id = id; |
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448 | |
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449 | write (sock_fd, &cmd, sizeof (cmd)); |
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450 | } |
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451 | } |
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452 | |
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453 | static |
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454 | void serve () |
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455 | { |
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456 | command cmd; |
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457 | vector<ptytty *> ptys; |
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458 | |
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459 | while (read (sock_fd, &cmd, sizeof (command)) == sizeof (command)) |
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460 | { |
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461 | if (cmd.type == command::get) |
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462 | { |
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463 | // -> id ptyfd ttyfd |
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464 | cmd.id = new ptytty_unix; |
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465 | |
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466 | if (cmd.id->get ()) |
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467 | { |
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468 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
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469 | ptys.push_back (cmd.id); |
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470 | |
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471 | ptytty_send_fd (sock_fd, cmd.id->pty); |
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472 | ptytty_send_fd (sock_fd, cmd.id->tty); |
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473 | } |
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474 | else |
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475 | { |
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476 | delete cmd.id; |
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477 | cmd.id = 0; |
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478 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
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479 | } |
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480 | } |
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481 | else if (cmd.type == command::login) |
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482 | { |
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483 | #if UTMP_SUPPORT |
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484 | if (find (ptys.begin (), ptys.end (), cmd.id)) |
|
|
485 | { |
|
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486 | cmd.hostname[sizeof (cmd.hostname) - 1] = 0; |
|
|
487 | cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname); |
|
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488 | } |
|
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489 | #endif |
|
|
490 | } |
|
|
491 | else if (cmd.type == command::destroy) |
|
|
492 | { |
|
|
493 | ptytty **pty = find (ptys.begin (), ptys.end (), cmd.id); |
|
|
494 | |
|
|
495 | if (pty) |
|
|
496 | { |
|
|
497 | delete *pty; |
|
|
498 | ptys.erase (pty); |
|
|
499 | } |
|
|
500 | } |
|
|
501 | else |
|
|
502 | break; |
|
|
503 | } |
|
|
504 | |
|
|
505 | // destroy all ptys |
|
|
506 | for (ptytty **i = ptys.end (); i-- > ptys.begin (); ) |
|
|
507 | delete *i; |
|
|
508 | } |
|
|
509 | |
|
|
510 | void ptytty_server () |
|
|
511 | { |
|
|
512 | int sv[2]; |
|
|
513 | |
|
|
514 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
|
|
515 | fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
|
|
516 | |
|
|
517 | pid = fork (); |
|
|
518 | |
|
|
519 | if (pid < 0) |
|
|
520 | fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
|
|
521 | |
|
|
522 | if (pid) |
|
|
523 | { |
|
|
524 | // client, process |
|
|
525 | sock_fd = sv[0]; |
|
|
526 | close (sv[1]); |
|
|
527 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
|
|
528 | } |
|
|
529 | else |
|
|
530 | { |
|
|
531 | // server, pty-helper |
|
|
532 | sock_fd = sv[1]; |
|
|
533 | |
|
|
534 | for (int fd = 0; fd < 1023; fd++) |
|
|
535 | if (fd != sock_fd) |
|
|
536 | close (fd); |
|
|
537 | |
|
|
538 | serve (); |
|
|
539 | _exit (EXIT_SUCCESS); |
|
|
540 | } |
|
|
541 | } |
|
|
542 | |
|
|
543 | #endif |
|
|
544 | |
|
|
545 | // a "factory" *g* |
|
|
546 | ptytty * |
|
|
547 | new_ptytty () |
|
|
548 | { |
|
|
549 | #if PTYTTY_HELPER |
|
|
550 | if (pid > 0) |
|
|
551 | // use helper process |
|
|
552 | return new ptytty_proxy; |
|
|
553 | else |
|
|
554 | #endif |
|
|
555 | return new ptytty_unix; |
|
|
556 | } |
|
|
557 | |
|
|
558 | /*----------------------- end-of-file (C source) -----------------------*/ |
|
|
559 | |
|
|