|
|
1 | // This file is part of libptytty. Do not make local modifications. |
|
|
2 | // http://software.schmorp.de/pkg/libptytty |
|
|
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> |
|
|
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" |
|
|
29 | |
25 | #include "rxvt.h" |
30 | #include "ptytty.h" |
26 | |
31 | |
27 | # include <cstdlib> |
32 | #include <cstdlib> |
28 | # include <cstring> |
33 | #include <cstring> |
|
|
34 | #include <csignal> |
29 | |
35 | |
30 | #ifdef HAVE_SYS_TYPES_H |
|
|
31 | # include <sys/types.h> |
36 | #include <sys/types.h> |
32 | #endif |
37 | #include <sys/socket.h> |
33 | #ifdef HAVE_UNISTD_H |
|
|
34 | # include <unistd.h> |
38 | #include <unistd.h> |
35 | #endif |
|
|
36 | #ifdef HAVE_FCNTL_H |
|
|
37 | # include <fcntl.h> |
39 | #include <fcntl.h> |
38 | #endif |
40 | |
39 | #ifdef HAVE_SYS_IOCTL_H |
41 | #ifdef HAVE_SYS_IOCTL_H |
40 | # include <sys/ioctl.h> |
42 | # include <sys/ioctl.h> |
41 | #endif |
43 | #endif |
42 | #if defined(PTYS_ARE_PTMX) && defined(HAVE_SYS_STROPTS_H) |
44 | #if defined(HAVE_DEV_PTMX) && defined(HAVE_SYS_STROPTS_H) |
43 | # include <sys/stropts.h> /* for I_PUSH */ |
45 | # include <sys/stropts.h> /* for I_PUSH */ |
44 | #endif |
46 | #endif |
45 | #ifdef HAVE_ISASTREAM |
47 | #ifdef HAVE_ISASTREAM |
46 | # include <stropts.h> |
48 | # include <stropts.h> |
47 | #endif |
49 | #endif |
… | |
… | |
50 | #elif defined(HAVE_LIBUTIL_H) |
52 | #elif defined(HAVE_LIBUTIL_H) |
51 | # include <libutil.h> |
53 | # include <libutil.h> |
52 | #elif defined(HAVE_UTIL_H) |
54 | #elif defined(HAVE_UTIL_H) |
53 | # include <util.h> |
55 | # include <util.h> |
54 | #endif |
56 | #endif |
|
|
57 | #ifdef TTY_GID_SUPPORT |
|
|
58 | #include <grp.h> |
|
|
59 | #endif |
55 | |
60 | |
56 | #include <cstdio> |
61 | #include <cstdio> |
57 | #include <grp.h> |
|
|
58 | |
|
|
59 | #include "ptytty.h" |
|
|
60 | |
62 | |
61 | ///////////////////////////////////////////////////////////////////////////// |
63 | ///////////////////////////////////////////////////////////////////////////// |
62 | |
64 | |
63 | /* ------------------------------------------------------------------------- * |
65 | /* ------------------------------------------------------------------------- * |
64 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
66 | * GET PSEUDO TELETYPE - MASTER AND SLAVE * |
… | |
… | |
66 | /* |
68 | /* |
67 | * Returns pty file descriptor, or -1 on failure |
69 | * Returns pty file descriptor, or -1 on failure |
68 | * 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. |
69 | * 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 |
70 | */ |
72 | */ |
|
|
73 | #if defined(UNIX98_PTY) |
71 | static int |
74 | static int |
72 | get_pty (int *fd_tty, char **ttydev) |
75 | get_pty (int *fd_tty, char **ttydev) |
73 | { |
76 | { |
74 | int pfd; |
77 | int pfd; |
75 | |
78 | |
76 | #ifdef PTYS_ARE_OPENPTY |
79 | # if defined(HAVE_GETPT) |
77 | char tty_name[sizeof "/dev/pts/????\0"]; |
80 | pfd = getpt(); |
|
|
81 | # elif defined(HAVE_POSIX_OPENPT) |
|
|
82 | pfd = posix_openpt (O_RDWR); |
|
|
83 | # else |
|
|
84 | pfd = open (CLONE_DEVICE, O_RDWR | O_NOCTTY, 0); |
|
|
85 | # endif |
|
|
86 | if (pfd >= 0) |
|
|
87 | { |
|
|
88 | if (grantpt (pfd) == 0 /* change slave permissions */ |
|
|
89 | && unlockpt (pfd) == 0) |
|
|
90 | { /* slave now unlocked */ |
|
|
91 | *ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
|
|
92 | return pfd; |
|
|
93 | } |
78 | |
94 | |
79 | rxvt_privileges(RESTORE); |
95 | close (pfd); |
|
|
96 | } |
|
|
97 | |
|
|
98 | return -1; |
|
|
99 | } |
|
|
100 | #elif defined(HAVE_OPENPTY) |
|
|
101 | static int |
|
|
102 | get_pty (int *fd_tty, char **ttydev) |
|
|
103 | { |
|
|
104 | int pfd; |
|
|
105 | int res; |
|
|
106 | char tty_name[32]; |
|
|
107 | |
80 | int res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
108 | res = openpty (&pfd, fd_tty, tty_name, NULL, NULL); |
81 | rxvt_privileges(IGNORE); |
|
|
82 | |
|
|
83 | if (res != -1) |
109 | if (res != -1) |
84 | { |
110 | { |
85 | *ttydev = strdup (tty_name); |
111 | *ttydev = strdup (tty_name); |
86 | return pfd; |
112 | return pfd; |
87 | } |
113 | } |
88 | #endif |
|
|
89 | |
114 | |
90 | #ifdef PTYS_ARE__GETPTY |
115 | return -1; |
|
|
116 | } |
|
|
117 | #elif defined(HAVE__GETPTY) |
|
|
118 | static int |
|
|
119 | get_pty (int *fd_tty, char **ttydev) |
|
|
120 | { |
|
|
121 | int pfd; |
|
|
122 | |
91 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
123 | *ttydev = _getpty (&pfd, O_RDWR | O_NONBLOCK | O_NOCTTY, 0622, 0); |
92 | if (*ttydev != NULL) |
124 | if (*ttydev != NULL) |
93 | return pfd; |
125 | return pfd; |
94 | #endif |
|
|
95 | |
126 | |
96 | #if defined(HAVE_GRANTPT) && defined(HAVE_UNLOCKPT) |
127 | return -1; |
97 | # if defined(PTYS_ARE_GETPT) || defined(PTYS_ARE_POSIX) || defined(PTYS_ARE_PTMX) |
128 | } |
|
|
129 | #elif defined(HAVE_DEV_PTC) |
|
|
130 | static int |
|
|
131 | get_pty (int *fd_tty, char **ttydev) |
|
|
132 | { |
|
|
133 | int pfd; |
98 | |
134 | |
99 | { |
|
|
100 | # ifdef PTYS_ARE_GETPT |
|
|
101 | pfd = getpt(); |
|
|
102 | # else |
|
|
103 | # ifdef PTYS_ARE_POSIX |
|
|
104 | pfd = posix_openpt (O_RDWR); |
|
|
105 | # else |
|
|
106 | pfd = open ("/dev/ptmx", O_RDWR | O_NOCTTY, 0); |
|
|
107 | # endif |
|
|
108 | # endif |
|
|
109 | |
|
|
110 | if (pfd >= 0) |
|
|
111 | { |
|
|
112 | if (grantpt (pfd) == 0 /* change slave permissions */ |
|
|
113 | && unlockpt (pfd) == 0) |
|
|
114 | { /* slave now unlocked */ |
|
|
115 | *ttydev = strdup (ptsname (pfd)); /* get slave's name */ |
|
|
116 | return pfd; |
|
|
117 | } |
|
|
118 | close (pfd); |
|
|
119 | } |
|
|
120 | } |
|
|
121 | # endif |
|
|
122 | #endif |
|
|
123 | |
|
|
124 | #ifdef PTYS_ARE_PTC |
|
|
125 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
135 | if ((pfd = open ("/dev/ptc", O_RDWR | O_NOCTTY, 0)) >= 0) |
126 | { |
136 | { |
127 | *ttydev = strdup (ttyname (pfd)); |
137 | *ttydev = strdup (ttyname (pfd)); |
128 | return pfd; |
138 | return pfd; |
129 | } |
139 | } |
130 | #endif |
|
|
131 | |
140 | |
132 | #ifdef PTYS_ARE_CLONE |
141 | return -1; |
|
|
142 | } |
|
|
143 | #elif defined(HAVE_DEV_CLONE) |
|
|
144 | static int |
|
|
145 | get_pty (int *fd_tty, char **ttydev) |
|
|
146 | { |
|
|
147 | int pfd; |
|
|
148 | |
133 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
149 | if ((pfd = open ("/dev/ptym/clone", O_RDWR | O_NOCTTY, 0)) >= 0) |
134 | { |
150 | { |
135 | *ttydev = strdup (ptsname (pfd)); |
151 | *ttydev = strdup (ptsname (pfd)); |
136 | return pfd; |
152 | return pfd; |
137 | } |
153 | } |
138 | #endif |
|
|
139 | |
|
|
140 | #ifdef PTYS_ARE_NUMERIC |
|
|
141 | { |
|
|
142 | int idx; |
|
|
143 | char *c1, *c2; |
|
|
144 | char pty_name[] = "/dev/ptyp???"; |
|
|
145 | char tty_name[] = "/dev/ttyp???"; |
|
|
146 | |
|
|
147 | c1 = &(pty_name[sizeof (pty_name) - 4]); |
|
|
148 | c2 = &(tty_name[sizeof (tty_name) - 4]); |
|
|
149 | for (idx = 0; idx < 256; idx++) |
|
|
150 | { |
|
|
151 | sprintf (c1, "%d", idx); |
|
|
152 | sprintf (c2, "%d", idx); |
|
|
153 | if (access (tty_name, F_OK) < 0) |
|
|
154 | { |
|
|
155 | idx = 256; |
|
|
156 | break; |
|
|
157 | } |
|
|
158 | |
|
|
159 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
|
|
160 | { |
|
|
161 | if (access (tty_name, R_OK | W_OK) == 0) |
|
|
162 | { |
|
|
163 | *ttydev = strdup (tty_name); |
|
|
164 | return pfd; |
|
|
165 | } |
|
|
166 | |
|
|
167 | close (pfd); |
|
|
168 | } |
|
|
169 | } |
|
|
170 | } |
|
|
171 | #endif |
|
|
172 | |
|
|
173 | #ifdef PTYS_ARE_SEARCHED |
|
|
174 | { |
|
|
175 | const char *c1, *c2; |
|
|
176 | char pty_name[] = "/dev/pty??"; |
|
|
177 | char tty_name[] = "/dev/tty??"; |
|
|
178 | |
|
|
179 | # ifndef PTYCHAR1 |
|
|
180 | # define PTYCHAR1 "pqrstuvwxyz" |
|
|
181 | # endif |
|
|
182 | # ifndef PTYCHAR2 |
|
|
183 | # define PTYCHAR2 "0123456789abcdef" |
|
|
184 | # endif |
|
|
185 | |
|
|
186 | for (c1 = PTYCHAR1; *c1; c1++) |
|
|
187 | { |
|
|
188 | pty_name[ (sizeof (pty_name) - 3)] = |
|
|
189 | tty_name[ (sizeof (pty_name) - 3)] = *c1; |
|
|
190 | for (c2 = PTYCHAR2; *c2; c2++) |
|
|
191 | { |
|
|
192 | pty_name[ (sizeof (pty_name) - 2)] = |
|
|
193 | tty_name[ (sizeof (pty_name) - 2)] = *c2; |
|
|
194 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) >= 0) |
|
|
195 | { |
|
|
196 | if (access (tty_name, R_OK | W_OK) == 0) |
|
|
197 | { |
|
|
198 | *ttydev = strdup (tty_name); |
|
|
199 | return pfd; |
|
|
200 | } |
|
|
201 | |
|
|
202 | close (pfd); |
|
|
203 | } |
|
|
204 | } |
|
|
205 | } |
|
|
206 | } |
|
|
207 | #endif |
|
|
208 | |
154 | |
209 | return -1; |
155 | return -1; |
210 | } |
156 | } |
|
|
157 | #else |
|
|
158 | /* Based on the code in openssh/openbsd-compat/bsd-openpty.c */ |
|
|
159 | static int |
|
|
160 | get_pty (int *fd_tty, char **ttydev) |
|
|
161 | { |
|
|
162 | int pfd; |
|
|
163 | int i; |
|
|
164 | char pty_name[32]; |
|
|
165 | char tty_name[32]; |
|
|
166 | const char *majors = "pqrstuvwxyzabcde"; |
|
|
167 | const char *minors = "0123456789abcdef"; |
|
|
168 | for (i = 0; i < 256; i++) |
|
|
169 | { |
|
|
170 | snprintf(pty_name, 32, "/dev/pty%c%c", majors[i / 16], minors[i % 16]); |
|
|
171 | snprintf(tty_name, 32, "/dev/tty%c%c", majors[i / 16], minors[i % 16]); |
|
|
172 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
|
|
173 | { |
|
|
174 | snprintf(pty_name, 32, "/dev/ptyp%d", i); |
|
|
175 | snprintf(tty_name, 32, "/dev/ttyp%d", i); |
|
|
176 | if ((pfd = open (pty_name, O_RDWR | O_NOCTTY, 0)) == -1) |
|
|
177 | continue; |
|
|
178 | } |
|
|
179 | if (access (tty_name, R_OK | W_OK) == 0) |
|
|
180 | { |
|
|
181 | *ttydev = strdup (tty_name); |
|
|
182 | return pfd; |
|
|
183 | } |
|
|
184 | |
|
|
185 | close (pfd); |
|
|
186 | } |
|
|
187 | } |
|
|
188 | #endif |
211 | |
189 | |
212 | /*----------------------------------------------------------------------*/ |
190 | /*----------------------------------------------------------------------*/ |
213 | /* |
191 | /* |
214 | * Returns tty file descriptor, or -1 on failure |
192 | * Returns tty file descriptor, or -1 on failure |
215 | */ |
193 | */ |
… | |
… | |
224 | * Make our tty a controlling tty so that /dev/tty points to us |
202 | * Make our tty a controlling tty so that /dev/tty points to us |
225 | */ |
203 | */ |
226 | static int |
204 | static int |
227 | control_tty (int fd_tty) |
205 | control_tty (int fd_tty) |
228 | { |
206 | { |
229 | int fd; |
|
|
230 | |
|
|
231 | /* ---------------------------------------- */ |
|
|
232 | setsid (); |
207 | setsid (); |
233 | |
208 | |
234 | /* ---------------------------------------- */ |
|
|
235 | # if defined(PTYS_ARE_PTMX) && defined(I_PUSH) |
209 | #if defined(HAVE_DEV_PTMX) && defined(I_PUSH) |
236 | /* |
210 | /* |
237 | * Push STREAMS modules: |
211 | * Push STREAMS modules: |
238 | * ptem: pseudo-terminal hardware emulation module. |
212 | * ptem: pseudo-terminal hardware emulation module. |
239 | * ldterm: standard terminal line discipline. |
213 | * ldterm: standard terminal line discipline. |
240 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
214 | * ttcompat: V7, 4BSD and XENIX STREAMS compatibility module. |
… | |
… | |
248 | * documentation is really unclear about whether it is any close () on |
222 | * documentation is really unclear about whether it is any close () on |
249 | * the master side or the last close () - i.e. a proper STREAMS dismantling |
223 | * the master side or the last close () - i.e. a proper STREAMS dismantling |
250 | * close () - on the master side which causes a hang up to be sent |
224 | * close () - on the master side which causes a hang up to be sent |
251 | * through - Geoff Wing |
225 | * through - Geoff Wing |
252 | */ |
226 | */ |
253 | # ifdef HAVE_ISASTREAM |
227 | # ifdef HAVE_ISASTREAM |
254 | if (isastream (fd_tty) == 1) |
228 | if (isastream (fd_tty) == 1) |
255 | # endif |
229 | # endif |
256 | { |
230 | { |
257 | ioctl (fd_tty, I_PUSH, "ptem"); |
231 | ioctl (fd_tty, I_PUSH, "ptem"); |
258 | ioctl (fd_tty, I_PUSH, "ldterm"); |
232 | ioctl (fd_tty, I_PUSH, "ldterm"); |
259 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
233 | ioctl (fd_tty, I_PUSH, "ttcompat"); |
260 | } |
234 | } |
261 | # endif |
235 | #endif |
262 | /* ---------------------------------------- */ |
236 | |
263 | fd = ioctl (fd_tty, TIOCSCTTY, NULL); |
237 | ioctl (fd_tty, TIOCSCTTY, NULL); |
264 | /* ---------------------------------------- */ |
238 | |
265 | fd = open ("/dev/tty", O_WRONLY); |
239 | int fd = open ("/dev/tty", O_WRONLY); |
266 | if (fd < 0) |
240 | if (fd < 0) |
267 | return -1; /* fatal */ |
241 | return -1; /* fatal */ |
|
|
242 | |
268 | close (fd); |
243 | close (fd); |
269 | /* ---------------------------------------- */ |
|
|
270 | |
244 | |
271 | return 0; |
245 | return 0; |
272 | } |
246 | } |
273 | |
247 | |
274 | void |
248 | void |
275 | rxvt_ptytty::close_tty () |
249 | ptytty::close_tty () |
276 | { |
250 | { |
277 | if (tty < 0) |
251 | if (tty < 0) |
278 | return; |
252 | return; |
279 | |
253 | |
280 | close (tty); |
254 | close (tty); |
281 | tty = -1; |
255 | tty = -1; |
282 | } |
256 | } |
283 | |
257 | |
284 | bool |
258 | bool |
285 | rxvt_ptytty::make_controlling_tty () |
259 | ptytty::make_controlling_tty () |
286 | { |
260 | { |
287 | return control_tty (tty) >= 0; |
261 | return control_tty (tty) >= 0; |
288 | } |
262 | } |
289 | |
263 | |
290 | void |
264 | void |
291 | rxvt_ptytty::set_utf8_mode (bool on) |
265 | ptytty::set_utf8_mode (bool on) |
292 | { |
266 | { |
293 | #ifdef IUTF8 |
267 | #ifdef IUTF8 |
294 | if (pty < 0) |
268 | if (pty < 0) |
295 | return; |
269 | return; |
296 | |
270 | |
… | |
… | |
312 | } |
286 | } |
313 | } |
287 | } |
314 | #endif |
288 | #endif |
315 | } |
289 | } |
316 | |
290 | |
317 | ///////////////////////////////////////////////////////////////////////////// |
|
|
318 | |
|
|
319 | #ifndef NO_SETOWNER_TTYDEV |
|
|
320 | static struct ttyconf { |
291 | static struct ttyconf { |
321 | gid_t gid; |
292 | gid_t gid; |
322 | mode_t mode; |
293 | mode_t mode; |
323 | |
294 | |
324 | ttyconf () |
295 | ttyconf () |
… | |
… | |
333 | } |
304 | } |
334 | else |
305 | else |
335 | #endif /* TTY_GID_SUPPORT */ |
306 | #endif /* TTY_GID_SUPPORT */ |
336 | { |
307 | { |
337 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
308 | mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH; |
338 | gid = getgid (); |
309 | gid = 0; |
339 | } |
310 | } |
340 | } |
311 | } |
341 | } ttyconf; |
312 | } ttyconf; |
342 | |
313 | |
343 | ///////////////////////////////////////////////////////////////////////////// |
314 | ptytty_unix::ptytty_unix () |
|
|
315 | { |
|
|
316 | name = 0; |
|
|
317 | #if UTMP_SUPPORT |
|
|
318 | cmd_pid = 0; |
|
|
319 | #endif |
|
|
320 | } |
|
|
321 | |
|
|
322 | ptytty_unix::~ptytty_unix () |
|
|
323 | { |
|
|
324 | #if UTMP_SUPPORT |
|
|
325 | logout (); |
|
|
326 | #endif |
|
|
327 | put (); |
|
|
328 | } |
344 | |
329 | |
345 | void |
330 | void |
346 | rxvt_ptytty_unix::privileges (rxvt_privaction action) |
331 | ptytty_unix::put () |
347 | { |
332 | { |
348 | if (!name || !*name) |
333 | chmod (name, RESTORE_TTY_MODE); |
349 | return; |
334 | chown (name, 0, ttyconf.gid); |
350 | |
335 | |
351 | rxvt_privileges (RESTORE); |
336 | close_tty (); |
352 | |
337 | |
353 | if (action == SAVE) |
338 | if (pty >= 0) |
354 | { |
339 | close (pty); |
355 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
|
|
356 | /* store original tty status for restoration rxvt_clean_exit () -- rgg 04/12/95 */ |
|
|
357 | if (lstat (name, &savestat) < 0) /* you lose out */ |
|
|
358 | ; |
|
|
359 | else |
|
|
360 | # endif |
|
|
361 | { |
|
|
362 | saved = true; |
|
|
363 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
|
|
364 | chmod (name, ttyconf.mode); |
|
|
365 | # ifdef HAVE_REVOKE |
|
|
366 | revoke (name); |
|
|
367 | # endif |
|
|
368 | } |
|
|
369 | } |
|
|
370 | else |
|
|
371 | { /* action == RESTORE */ |
|
|
372 | # ifndef RESET_TTY_TO_COMMON_DEFAULTS |
|
|
373 | if (saved) |
|
|
374 | { |
|
|
375 | chmod (name, savestat.st_mode); |
|
|
376 | chown (name, savestat.st_uid, savestat.st_gid); |
|
|
377 | } |
|
|
378 | # else |
|
|
379 | chmod (name, (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)); |
|
|
380 | chown (name, 0, 0); |
|
|
381 | # endif |
|
|
382 | |
340 | |
383 | } |
341 | free (name); |
384 | |
342 | |
385 | rxvt_privileges (IGNORE); |
|
|
386 | } |
|
|
387 | #endif |
|
|
388 | |
|
|
389 | rxvt_ptytty_unix::rxvt_ptytty_unix () |
|
|
390 | { |
|
|
391 | pty = tty = -1; |
343 | pty = tty = -1; |
392 | name = 0; |
344 | name = 0; |
393 | #ifndef NO_SETOWNER_TTYDEV |
|
|
394 | saved = false; |
|
|
395 | #endif |
|
|
396 | #if UTMP_SUPPORT |
|
|
397 | cmd_pid = 0; |
|
|
398 | #endif |
|
|
399 | } |
|
|
400 | |
|
|
401 | rxvt_ptytty_unix::~rxvt_ptytty_unix () |
|
|
402 | { |
|
|
403 | logout (); |
|
|
404 | put (); |
|
|
405 | } |
|
|
406 | |
|
|
407 | void |
|
|
408 | rxvt_ptytty_unix::put () |
|
|
409 | { |
|
|
410 | #ifndef NO_SETOWNER_TTYDEV |
|
|
411 | privileges (RESTORE); |
|
|
412 | #endif |
|
|
413 | |
|
|
414 | if (pty >= 0) close (pty); |
|
|
415 | close_tty (); |
|
|
416 | free (name); |
|
|
417 | |
|
|
418 | pty = tty = -1; |
|
|
419 | name = 0; |
|
|
420 | } |
345 | } |
421 | |
346 | |
422 | bool |
347 | bool |
423 | rxvt_ptytty_unix::get () |
348 | ptytty_unix::get () |
424 | { |
349 | { |
425 | /* get master (pty) */ |
350 | /* get master (pty) */ |
426 | if ((pty = get_pty (&tty, &name)) < 0) |
351 | if ((pty = get_pty (&tty, &name)) < 0) |
427 | return false; |
352 | return false; |
428 | |
353 | |
… | |
… | |
430 | |
355 | |
431 | /* get slave (tty) */ |
356 | /* get slave (tty) */ |
432 | if (tty < 0) |
357 | if (tty < 0) |
433 | { |
358 | { |
434 | #ifndef NO_SETOWNER_TTYDEV |
359 | #ifndef NO_SETOWNER_TTYDEV |
435 | privileges (SAVE); |
360 | chown (name, getuid (), ttyconf.gid); /* fail silently */ |
|
|
361 | chmod (name, ttyconf.mode); |
|
|
362 | # ifdef HAVE_REVOKE |
|
|
363 | revoke (name); |
|
|
364 | # endif |
436 | #endif |
365 | #endif |
437 | |
366 | |
438 | if ((tty = get_tty (name)) < 0) |
367 | if ((tty = get_tty (name)) < 0) |
439 | { |
368 | { |
440 | put (); |
369 | put (); |
… | |
… | |
443 | } |
372 | } |
444 | |
373 | |
445 | return true; |
374 | return true; |
446 | } |
375 | } |
447 | |
376 | |
448 | // a "factory" *g* |
377 | ///////////////////////////////////////////////////////////////////////////// |
449 | rxvt_ptytty *rxvt_new_ptytty () |
378 | // helper/proxy support |
|
|
379 | |
|
|
380 | #if PTYTTY_HELPER |
|
|
381 | |
|
|
382 | static int sock_fd = -1, lock_fd = -1; |
|
|
383 | static int helper_pid, owner_pid; |
|
|
384 | |
|
|
385 | struct command |
450 | { |
386 | { |
|
|
387 | enum { get, login, destroy } type; |
|
|
388 | |
|
|
389 | ptytty *id; |
|
|
390 | |
|
|
391 | bool login_shell; |
|
|
392 | int cmd_pid; |
|
|
393 | char hostname[512]; // arbitrary, but should be plenty |
|
|
394 | }; |
|
|
395 | |
|
|
396 | struct ptytty_proxy : ptytty |
|
|
397 | { |
|
|
398 | ptytty *id; |
|
|
399 | |
|
|
400 | ptytty_proxy () |
|
|
401 | : id(0) |
|
|
402 | { |
|
|
403 | } |
|
|
404 | |
|
|
405 | ~ptytty_proxy (); |
|
|
406 | |
|
|
407 | bool get (); |
|
|
408 | void login (int cmd_pid, bool login_shell, const char *hostname); |
|
|
409 | }; |
|
|
410 | |
|
|
411 | #if PTYTTY_REENTRANT |
|
|
412 | # define NEED_TOKEN do { char ch; read (lock_fd, &ch, 1); } while (0) |
|
|
413 | # define GIVE_TOKEN do { char ch; write (lock_fd, &ch, 1); } while (0) |
|
|
414 | #else |
|
|
415 | # define NEED_TOKEN (void)0 |
|
|
416 | # define GIVE_TOKEN (void)0 |
|
|
417 | #endif |
|
|
418 | |
|
|
419 | bool |
|
|
420 | ptytty_proxy::get () |
|
|
421 | { |
|
|
422 | NEED_TOKEN; |
|
|
423 | |
|
|
424 | command cmd; |
|
|
425 | |
|
|
426 | cmd.type = command::get; |
|
|
427 | |
|
|
428 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
429 | |
|
|
430 | if (read (sock_fd, &id, sizeof (id)) != sizeof (id)) |
|
|
431 | ptytty_fatal ("protocol error while creating pty using helper process, aborting.\n"); |
|
|
432 | |
|
|
433 | if (!id) |
|
|
434 | { |
|
|
435 | GIVE_TOKEN; |
|
|
436 | return false; |
|
|
437 | } |
|
|
438 | |
|
|
439 | if ((pty = recv_fd (sock_fd)) < 0 |
|
|
440 | || (tty = recv_fd (sock_fd)) < 0) |
|
|
441 | ptytty_fatal ("protocol error while reading pty/tty fds from helper process, aborting.\n"); |
|
|
442 | |
|
|
443 | GIVE_TOKEN; |
|
|
444 | return true; |
|
|
445 | } |
|
|
446 | |
|
|
447 | void |
|
|
448 | ptytty_proxy::login (int cmd_pid, bool login_shell, const char *hostname) |
|
|
449 | { |
|
|
450 | NEED_TOKEN; |
|
|
451 | |
|
|
452 | command cmd; |
|
|
453 | |
|
|
454 | cmd.type = command::login; |
|
|
455 | cmd.id = id; |
|
|
456 | cmd.cmd_pid = cmd_pid; |
|
|
457 | cmd.login_shell = login_shell; |
|
|
458 | strncpy (cmd.hostname, hostname, sizeof (cmd.hostname)); |
|
|
459 | |
|
|
460 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
461 | |
|
|
462 | GIVE_TOKEN; |
|
|
463 | } |
|
|
464 | |
|
|
465 | ptytty_proxy::~ptytty_proxy () |
|
|
466 | { |
|
|
467 | if (id) |
|
|
468 | { |
|
|
469 | NEED_TOKEN; |
|
|
470 | |
|
|
471 | command cmd; |
|
|
472 | |
|
|
473 | cmd.type = command::destroy; |
|
|
474 | cmd.id = id; |
|
|
475 | |
|
|
476 | write (sock_fd, &cmd, sizeof (cmd)); |
|
|
477 | |
|
|
478 | GIVE_TOKEN; |
|
|
479 | } |
|
|
480 | } |
|
|
481 | |
|
|
482 | static |
|
|
483 | void serve () |
|
|
484 | { |
|
|
485 | command cmd; |
|
|
486 | vector<ptytty *> ptys; |
|
|
487 | |
|
|
488 | for (;;) |
|
|
489 | { |
|
|
490 | GIVE_TOKEN; |
|
|
491 | |
|
|
492 | if (read (sock_fd, &cmd, sizeof (command)) != sizeof (command)) |
|
|
493 | break; |
|
|
494 | |
|
|
495 | if (cmd.type == command::get) |
|
|
496 | { |
|
|
497 | // -> id ptyfd ttyfd |
|
|
498 | cmd.id = new ptytty_unix; |
|
|
499 | |
|
|
500 | if (cmd.id->get ()) |
|
|
501 | { |
|
|
502 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
|
|
503 | ptys.push_back (cmd.id); |
|
|
504 | |
|
|
505 | ptytty::send_fd (sock_fd, cmd.id->pty); |
|
|
506 | ptytty::send_fd (sock_fd, cmd.id->tty); |
|
|
507 | } |
|
|
508 | else |
|
|
509 | { |
|
|
510 | delete cmd.id; |
|
|
511 | cmd.id = 0; |
|
|
512 | write (sock_fd, &cmd.id, sizeof (cmd.id)); |
|
|
513 | } |
|
|
514 | } |
|
|
515 | else if (cmd.type == command::login) |
|
|
516 | { |
|
|
517 | #if UTMP_SUPPORT |
|
|
518 | if (find (ptys.begin (), ptys.end (), cmd.id) != ptys.end ()) |
|
|
519 | { |
|
|
520 | cmd.hostname[sizeof (cmd.hostname) - 1] = 0; |
|
|
521 | cmd.id->login (cmd.cmd_pid, cmd.login_shell, cmd.hostname); |
|
|
522 | } |
|
|
523 | #endif |
|
|
524 | } |
|
|
525 | else if (cmd.type == command::destroy) |
|
|
526 | { |
|
|
527 | vector<ptytty *>::iterator pty = find (ptys.begin (), ptys.end (), cmd.id); |
|
|
528 | |
|
|
529 | if (pty != ptys.end ()) |
|
|
530 | { |
|
|
531 | delete *pty; |
|
|
532 | ptys.erase (pty); |
|
|
533 | } |
|
|
534 | } |
|
|
535 | else |
|
|
536 | break; |
|
|
537 | |
|
|
538 | NEED_TOKEN; |
|
|
539 | } |
|
|
540 | |
|
|
541 | // destroy all ptys |
|
|
542 | for (vector<ptytty *>::iterator i = ptys.end (); i-- > ptys.begin (); ) |
|
|
543 | delete *i; |
|
|
544 | } |
|
|
545 | |
|
|
546 | void |
|
|
547 | ptytty::use_helper () |
|
|
548 | { |
|
|
549 | #ifndef PTYTTY_NO_PID_CHECK |
|
|
550 | int pid = getpid (); |
|
|
551 | #endif |
|
|
552 | |
|
|
553 | if (sock_fd >= 0 |
|
|
554 | #ifndef PTYTTY_NO_PID_CHECK |
|
|
555 | && pid == owner_pid |
|
|
556 | #endif |
|
|
557 | ) |
|
|
558 | return; |
|
|
559 | |
|
|
560 | #ifndef PTYTTY_NO_PID_CHECK |
|
|
561 | owner_pid = pid; |
|
|
562 | #endif |
|
|
563 | |
|
|
564 | int sv[2]; |
|
|
565 | |
|
|
566 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv)) |
|
|
567 | ptytty_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
|
|
568 | |
|
|
569 | #ifdef PTYTTY_REENTRANT |
|
|
570 | int lv[2]; |
|
|
571 | |
|
|
572 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, lv)) |
|
|
573 | ptytty_fatal ("could not create socket to communicate with pty/sessiondb helper, aborting.\n"); |
|
|
574 | #endif |
|
|
575 | |
|
|
576 | helper_pid = fork (); |
|
|
577 | |
|
|
578 | if (helper_pid < 0) |
|
|
579 | ptytty_fatal ("could not create pty/sessiondb helper process, aborting.\n"); |
|
|
580 | |
|
|
581 | if (helper_pid) |
|
|
582 | { |
|
|
583 | // client, process |
|
|
584 | sock_fd = sv[0]; |
|
|
585 | close (sv[1]); |
|
|
586 | fcntl (sock_fd, F_SETFD, FD_CLOEXEC); |
|
|
587 | #ifdef PTYTTY_REENTRANT |
|
|
588 | lock_fd = lv[0]; |
|
|
589 | close (lv[1]); |
|
|
590 | fcntl (lock_fd, F_SETFD, FD_CLOEXEC); |
|
|
591 | #endif |
|
|
592 | } |
|
|
593 | else |
|
|
594 | { |
|
|
595 | // server, pty-helper |
|
|
596 | sock_fd = sv[1]; |
|
|
597 | #ifdef PTYTTY_REENTRANT |
|
|
598 | lock_fd = lv[1]; |
|
|
599 | #endif |
|
|
600 | |
|
|
601 | chdir ("/"); |
|
|
602 | |
|
|
603 | signal (SIGHUP, SIG_IGN); |
|
|
604 | signal (SIGTERM, SIG_IGN); |
|
|
605 | signal (SIGINT, SIG_IGN); |
|
|
606 | signal (SIGPIPE, SIG_IGN); |
|
|
607 | |
|
|
608 | for (int fd = 0; fd < 1023; fd++) |
|
|
609 | if (fd != sock_fd && fd != lock_fd) |
|
|
610 | close (fd); |
|
|
611 | |
|
|
612 | serve (); |
|
|
613 | _exit (EXIT_SUCCESS); |
|
|
614 | } |
|
|
615 | } |
|
|
616 | |
|
|
617 | #endif |
|
|
618 | |
|
|
619 | ptytty * |
|
|
620 | ptytty::create () |
|
|
621 | { |
|
|
622 | #if PTYTTY_HELPER |
|
|
623 | if (helper_pid |
|
|
624 | # ifndef PTYTTY_NO_PID_CHECK |
|
|
625 | && getpid () == owner_pid |
|
|
626 | # endif |
|
|
627 | ) |
|
|
628 | // use helper process |
|
|
629 | return new ptytty_proxy; |
|
|
630 | else |
|
|
631 | #endif |
451 | return new rxvt_ptytty_unix; |
632 | return new ptytty_unix; |
452 | } |
633 | } |
453 | |
634 | |
454 | /*----------------------- end-of-file (C source) -----------------------*/ |
635 | void |
|
|
636 | ptytty::init () |
|
|
637 | { |
|
|
638 | uid_t uid = getuid (); |
|
|
639 | gid_t gid = getgid (); |
|
|
640 | |
|
|
641 | // before doing anything else, check for setuid/setgid operation, |
|
|
642 | // start the helper process and drop privileges |
|
|
643 | if (uid != geteuid () |
|
|
644 | || gid != getegid ()) |
|
|
645 | { |
|
|
646 | #if PTYTTY_HELPER |
|
|
647 | use_helper (); |
|
|
648 | #else |
|
|
649 | ptytty_warn ("running setuid/setgid without pty helper compiled in, continuing unprivileged.\n"); |
|
|
650 | #endif |
455 | |
651 | |
|
|
652 | drop_privileges (); |
|
|
653 | } |
|
|
654 | } |
|
|
655 | |
|
|
656 | void |
|
|
657 | ptytty::drop_privileges () |
|
|
658 | { |
|
|
659 | uid_t uid = getuid (); |
|
|
660 | gid_t gid = getgid (); |
|
|
661 | |
|
|
662 | // drop privileges |
|
|
663 | #if HAVE_SETRESUID |
|
|
664 | setresgid (gid, gid, gid); |
|
|
665 | setresuid (uid, uid, uid); |
|
|
666 | #elif HAVE_SETREUID |
|
|
667 | setregid (gid, gid); |
|
|
668 | setreuid (uid, uid); |
|
|
669 | #elif HAVE_SETUID |
|
|
670 | setgid (gid); |
|
|
671 | setuid (uid); |
|
|
672 | #endif |
|
|
673 | |
|
|
674 | if (uid != geteuid () |
|
|
675 | || gid != getegid ()) |
|
|
676 | ptytty_fatal ("unable to drop privileges, aborting.\n"); |
|
|
677 | } |
|
|
678 | |
|
|
679 | ///////////////////////////////////////////////////////////////////////////// |
|
|
680 | // C API |
|
|
681 | |
|
|
682 | #ifndef PTYTTY_NO_C_API |
|
|
683 | |
|
|
684 | #define DEFINE_METHOD(retval, name, args1, args2) \ |
|
|
685 | extern "C" retval ptytty_ ## name args1 \ |
|
|
686 | { return ((struct ptytty *)ptytty)->name args2; } |
|
|
687 | |
|
|
688 | DEFINE_METHOD(int,pty,(void *ptytty),) |
|
|
689 | DEFINE_METHOD(int,tty,(void *ptytty),) |
|
|
690 | DEFINE_METHOD(int,get,(void *ptytty),()) |
|
|
691 | DEFINE_METHOD(void,login,(void *ptytty, int cmd_pid, bool login_shell, const char *hostname),(cmd_pid,login_shell,hostname)) |
|
|
692 | |
|
|
693 | DEFINE_METHOD(void,close_tty,(void *ptytty),()) |
|
|
694 | DEFINE_METHOD(int,make_controlling_tty,(void *ptytty),()) |
|
|
695 | DEFINE_METHOD(void,set_utf8_mode,(void *ptytty, int on),(on)) |
|
|
696 | |
|
|
697 | #define DEFINE_STATIC(retval, name, args) \ |
|
|
698 | extern "C" retval ptytty_ ## name args \ |
|
|
699 | { return ptytty::name args; } |
|
|
700 | |
|
|
701 | DEFINE_STATIC(void,drop_privileges,()) |
|
|
702 | DEFINE_STATIC(void,use_helper,()) |
|
|
703 | DEFINE_STATIC(void,init,()) |
|
|
704 | |
|
|
705 | DEFINE_STATIC(void *,create,()) |
|
|
706 | |
|
|
707 | void ptytty_delete (void *ptytty) |
|
|
708 | { |
|
|
709 | delete (struct ptytty *)ptytty; |
|
|
710 | } |
|
|
711 | |
|
|
712 | // send_fd, recv_fd not exposed |
|
|
713 | |
|
|
714 | #endif |