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Revision 204 - (hide annotations) (download) (as text)
Fri Dec 2 08:49:38 2005 UTC (8 years, 10 months ago) by azarah
File MIME type: text/x-csrc
File size: 15431 byte(s)
Add /dev/shm to write path.
1 ferringb 2 /*
2     ** Path sandbox for the gentoo linux portage package system, initially
3     ** based on the ROCK Linux Wrapper for getting a list of created files
4     **
5     ** to integrate with bash, bash should have been built like this
6     **
7     ** ./configure --prefix=<prefix> --host=<host> --without-gnu-malloc
8     **
9     ** it's very important that the --enable-static-link option is NOT specified
10     **
11     ** Copyright (C) 2001 Geert Bevin, Uwyn, http://www.uwyn.com
12     ** Distributed under the terms of the GNU General Public License, v2 or later
13     ** Author : Geert Bevin <gbevin@uwyn.com>
14     ** $Header$
15     */
16    
17     /* #define _GNU_SOURCE */
18    
19     #include <errno.h>
20     #include <signal.h>
21     #include <stdio.h>
22     #include <stdlib.h>
23     #include <limits.h>
24     #include <string.h>
25     #include <sys/wait.h>
26     #include <unistd.h>
27     #include <fcntl.h>
28 azarah 142
29 ferringb 2 #include "sandbox.h"
30    
31 azarah 101 struct sandbox_info_t {
32     char sandbox_log[SB_PATH_MAX];
33     char sandbox_debug_log[SB_PATH_MAX];
34     char sandbox_lib[SB_PATH_MAX];
35     char sandbox_rc[SB_PATH_MAX];
36 azarah 157 char work_dir[SB_PATH_MAX];
37 azarah 101 char var_tmp_dir[SB_PATH_MAX];
38     char tmp_dir[SB_PATH_MAX];
39     char *home_dir;
40     } sandbox_info_t;
41 ferringb 2
42 azarah 99 static int print_debug = 0;
43     static int stop_called = 0;
44    
45 azarah 141 int sandbox_setup(struct sandbox_info_t *sandbox_info)
46 azarah 101 {
47 azarah 165 if (NULL != getenv(ENV_PORTAGE_TMPDIR)) {
48     /* Portage handle setting SANDBOX_WRITE itself. */
49     sandbox_info->work_dir[0] = '\0';
50 azarah 157 } else {
51 azarah 194 if (NULL == egetcwd(sandbox_info->work_dir, SB_PATH_MAX)) {
52 azarah 157 perror("sandbox: Failed to get current directory");
53     return -1;
54     }
55 azarah 101 }
56    
57 azarah 152 /* Do not resolve symlinks, etc .. libsandbox will handle that. */
58     if (1 != is_dir(VAR_TMPDIR, 1)) {
59 azarah 145 perror("sandbox: Failed to get var_tmp_dir");
60 azarah 101 return -1;
61     }
62 azarah 152 snprintf(sandbox_info->var_tmp_dir, SB_PATH_MAX, "%s", VAR_TMPDIR);
63 azarah 139
64 azarah 101 if (-1 == get_tmp_dir(sandbox_info->tmp_dir)) {
65 azarah 145 perror("sandbox: Failed to get tmp_dir");
66 azarah 101 return -1;
67     }
68 azarah 158 setenv(ENV_TMPDIR, sandbox_info->tmp_dir, 1);
69 azarah 101
70     sandbox_info->home_dir = getenv("HOME");
71     if (!sandbox_info->home_dir) {
72 azarah 158 sandbox_info->home_dir = sandbox_info->tmp_dir;
73 azarah 101 setenv("HOME", sandbox_info->home_dir, 1);
74     }
75    
76     /* Generate sandbox lib path */
77 azarah 140 get_sandbox_lib(sandbox_info->sandbox_lib);
78 azarah 101
79     /* Generate sandbox bashrc path */
80 azarah 140 get_sandbox_rc(sandbox_info->sandbox_rc);
81 azarah 101
82     /* Generate sandbox log full path */
83 azarah 140 get_sandbox_log(sandbox_info->sandbox_log);
84 azarah 146 if (1 == exists(sandbox_info->sandbox_log)) {
85     if (-1 == unlink(sandbox_info->sandbox_log)) {
86     perror("sandbox: Could not unlink old log file");
87 azarah 147 return -1;
88 azarah 146 }
89     }
90 azarah 101
91     /* Generate sandbox debug log full path */
92 azarah 140 get_sandbox_debug_log(sandbox_info->sandbox_debug_log);
93 azarah 147 if (1 == exists(sandbox_info->sandbox_debug_log)) {
94 azarah 146 if (-1 == unlink(sandbox_info->sandbox_debug_log)) {
95     perror("sandbox: Could not unlink old debug log file");
96 azarah 147 return -1;
97 azarah 146 }
98     }
99 azarah 101
100     return 0;
101     }
102    
103 azarah 88 int print_sandbox_log(char *sandbox_log)
104     {
105     int sandbox_log_file = -1;
106     char *beep_count_env = NULL;
107     int i, color, beep_count = 0;
108     long len = 0;
109     char *buffer = NULL;
110    
111 azarah 139 if (1 != is_file(sandbox_log)) {
112 azarah 145 perror("sandbox: Log file is not a regular file");
113 azarah 88 return 0;
114 azarah 139 }
115    
116     sandbox_log_file = open(sandbox_log, O_RDONLY);
117     if (-1 == sandbox_log_file) {
118 azarah 145 perror("sandbox: Could not open Log file");
119 azarah 139 return 0;
120     }
121 azarah 88
122     len = file_length(sandbox_log_file);
123     buffer = (char *)malloc((len + 1) * sizeof(char));
124     memset(buffer, 0, len + 1);
125     read(sandbox_log_file, buffer, len);
126 azarah 139 close(sandbox_log_file);
127 azarah 88
128     color = ((getenv("NOCOLOR") != NULL) ? 0 : 1);
129    
130 azarah 144 EERROR(color,
131     "--------------------------- ACCESS VIOLATION SUMMARY ---------------------------",
132     "\n");
133     EERROR(color, "LOG FILE = \"%s\"", "\n\n", sandbox_log);
134     fprintf(stderr, "%s", buffer);
135     if (NULL != buffer)
136 azarah 88 free(buffer);
137 azarah 144 EERROR(color,
138     "--------------------------------------------------------------------------------",
139     "\n");
140 azarah 88
141     beep_count_env = getenv(ENV_SANDBOX_BEEP);
142     if (beep_count_env)
143     beep_count = atoi(beep_count_env);
144     else
145     beep_count = DEFAULT_BEEP_COUNT;
146    
147     for (i = 0; i < beep_count; i++) {
148     fputc('\a', stderr);
149     if (i < beep_count - 1)
150     sleep(1);
151     }
152 azarah 139
153 azarah 88 return 1;
154     }
155    
156 azarah 30 void stop(int signum)
157 ferringb 2 {
158     if (stop_called == 0) {
159     stop_called = 1;
160 azarah 145 printf("sandbox: Caught signal %d in pid %d\n",
161     signum, getpid());
162 ferringb 2 } else {
163 azarah 145 fprintf(stderr,
164     "sandbox: Signal already caught and busy still cleaning up!\n");
165 ferringb 2 }
166     }
167    
168 azarah 159 int get_sandbox_write_envvar(char *buf, struct sandbox_info_t *sandbox_info)
169 ferringb 2 {
170 azarah 159 int retval = 0;
171    
172 azarah 89 /* bzero out entire buffer then append trailing 0 */
173 azarah 93 memset(buf, 0, SB_BUF_LEN);
174 azarah 30
175 azarah 89 /* these could go into make.globals later on */
176 azarah 159 retval = snprintf(buf, SB_BUF_LEN,
177 azarah 89 "%s:%s/.gconfd/lock:%s/.bash_history:%s:%s:%s:%s",
178 azarah 113 "/dev/zero:/dev/null:/dev/fd:/proc/self/fd:/dev/pts/:"
179 azarah 155 "/dev/vc/:/dev/pty:/dev/tty:/dev/tts:/dev/console:"
180 azarah 204 "/dev/shm:/dev/shm/ngpt:/var/log/scrollkeeper.log:"
181 azarah 89 "/usr/tmp/conftest:/usr/lib/conftest:"
182     "/usr/lib32/conftest:/usr/lib64/conftest:"
183     "/usr/tmp/cf:/usr/lib/cf:/usr/lib32/cf:/usr/lib64/cf",
184 azarah 101 sandbox_info->home_dir, sandbox_info->home_dir,
185 azarah 165 sandbox_info->work_dir[0] != '\0' ? sandbox_info->work_dir
186     : "",
187 azarah 101 sandbox_info->tmp_dir, sandbox_info->var_tmp_dir,
188     "/tmp/:/var/tmp/");
189 azarah 159 if (SB_BUF_LEN <= retval) {
190     errno = EMSGSIZE;
191     perror("sandbox: Failed to generate SANDBOX_WRITE");
192     return -1;
193     }
194    
195     return 0;
196 azarah 89 }
197    
198 azarah 159 int get_sandbox_predict_envvar(char *buf, struct sandbox_info_t *sandbox_info)
199 azarah 89 {
200 azarah 159 int retval = 0;
201 ferringb 2 /* bzero out entire buffer then append trailing 0 */
202 azarah 93 memset(buf, 0, SB_BUF_LEN);
203 ferringb 2
204 azarah 89 /* these should go into make.globals later on */
205 azarah 159 retval = snprintf(buf, SB_BUF_LEN, "%s/.:"
206 azarah 89 "/usr/lib/python2.0/:"
207     "/usr/lib/python2.1/:"
208     "/usr/lib/python2.2/:"
209     "/usr/lib/python2.3/:"
210     "/usr/lib/python2.4/:"
211     "/usr/lib/python2.5/:"
212 azarah 126 "/usr/lib/python3.0/:"
213     "/var/db/aliases.db:"
214     "/var/db/netgroup.db:"
215     "/var/db/netmasks.db:"
216     "/var/db/ethers.db:"
217     "/var/db/rpc.db:"
218     "/var/db/protocols.db:"
219     "/var/db/services.db:"
220     "/var/db/networks.db:"
221     "/var/db/hosts.db:"
222     "/var/db/group.db:"
223 azarah 131 "/var/db/passwd.db",
224 azarah 101 sandbox_info->home_dir);
225 azarah 159 if (SB_BUF_LEN <= retval) {
226     errno = EMSGSIZE;
227     perror("sandbox: Failed to generate SANDBOX_PREDICT");
228     return -1;
229     }
230    
231     return 0;
232 azarah 89 }
233 ferringb 2
234 azarah 124 int sandbox_setenv(char **env, const char *name, const char *val) {
235 azarah 89 char **tmp_env = env;
236     char *tmp_string = NULL;
237 azarah 159 int retval = 0;
238 azarah 89
239 azarah 100 /* XXX: We add the new variable to the end (no replacing). If this
240     * is changed, we need to fix sandbox_setup_environ() below */
241 azarah 89 while (NULL != *tmp_env)
242     tmp_env++;
243    
244     /* strlen(name) + strlen(val) + '=' + '\0' */
245 azarah 96 /* FIXME: Should probably free this at some stage - more neatness than
246     * a real leak that will cause issues. */
247 azarah 89 tmp_string = calloc(strlen(name) + strlen(val) + 2, sizeof(char *));
248     if (NULL == tmp_string) {
249 azarah 145 perror("sandbox: Out of memory (sandbox_setenv)");
250     exit(EXIT_FAILURE);
251 ferringb 2 }
252 azarah 89
253 azarah 159 retval = snprintf(tmp_string, strlen(name) + strlen(val) + 2, "%s=%s",
254     name, val);
255 azarah 89 *tmp_env = tmp_string;
256    
257     return 0;
258 ferringb 2 }
259    
260 azarah 89 /* We setup the environment child side only to prevent issues with
261     * setting LD_PRELOAD parent side */
262 azarah 124 char **sandbox_setup_environ(struct sandbox_info_t *sandbox_info)
263 ferringb 2 {
264 azarah 89 int env_size = 0;
265 azarah 100 int have_ld_preload = 0;
266 azarah 89
267     char **new_environ;
268     char **env_ptr = environ;
269 azarah 124 char sandbox_write_envvar[SB_BUF_LEN];
270     char sandbox_predict_envvar[SB_BUF_LEN];
271 azarah 89 char *ld_preload_envvar = NULL;
272 azarah 100 char *orig_ld_preload_envvar = NULL;
273 ferringb 2
274 azarah 89 /* Unset these, as its easier than replacing when setting up our
275     * new environment below */
276 azarah 193 unsetenv(ENV_SANDBOX_ON);
277 azarah 89 unsetenv(ENV_SANDBOX_LIB);
278     unsetenv(ENV_SANDBOX_BASHRC);
279     unsetenv(ENV_SANDBOX_LOG);
280     unsetenv(ENV_SANDBOX_DEBUG_LOG);
281    
282 azarah 100 if (NULL != getenv(ENV_LD_PRELOAD)) {
283     have_ld_preload = 1;
284     orig_ld_preload_envvar = getenv(ENV_LD_PRELOAD);
285    
286 azarah 96 /* FIXME: Should probably free this at some stage - more neatness
287     * than a real leak that will cause issues. */
288 azarah 100 ld_preload_envvar = calloc(strlen(orig_ld_preload_envvar) +
289 azarah 101 strlen(sandbox_info->sandbox_lib) + 2,
290     sizeof(char *));
291 azarah 89 if (NULL == ld_preload_envvar)
292     return NULL;
293 azarah 100 snprintf(ld_preload_envvar, strlen(orig_ld_preload_envvar) +
294 azarah 101 strlen(sandbox_info->sandbox_lib) + 2, "%s %s",
295     sandbox_info->sandbox_lib, orig_ld_preload_envvar);
296 azarah 89 } else {
297 azarah 96 /* FIXME: Should probably free this at some stage - more neatness
298     * than a real leak that will cause issues. */
299 azarah 101 ld_preload_envvar = strndup(sandbox_info->sandbox_lib,
300     strlen(sandbox_info->sandbox_lib));
301 azarah 89 if (NULL == ld_preload_envvar)
302     return NULL;
303     }
304 azarah 100 /* Do not unset this, as strange things might happen */
305     /* unsetenv(ENV_LD_PRELOAD); */
306 ferringb 2
307 azarah 89 while (NULL != *env_ptr) {
308     env_size++;
309     env_ptr++;
310     }
311 ferringb 2
312 azarah 96 /* FIXME: Should probably free this at some stage - more neatness than
313     * a real leak that will cause issues. */
314 azarah 89 new_environ = calloc((env_size + 15 + 1) * sizeof(char *), sizeof(char *));
315     if (NULL == new_environ)
316     return NULL;
317    
318     /* First add our new variables to the beginning - this is due to some
319     * weirdness that I cannot remember */
320 azarah 193 sandbox_setenv(new_environ, ENV_SANDBOX_ON, "1");
321 azarah 101 sandbox_setenv(new_environ, ENV_SANDBOX_LIB, sandbox_info->sandbox_lib);
322     sandbox_setenv(new_environ, ENV_SANDBOX_BASHRC, sandbox_info->sandbox_rc);
323     sandbox_setenv(new_environ, ENV_SANDBOX_LOG, sandbox_info->sandbox_log);
324     sandbox_setenv(new_environ, ENV_SANDBOX_DEBUG_LOG,
325     sandbox_info->sandbox_debug_log);
326 azarah 100 /* If LD_PRELOAD was not set, set it here, else do it below */
327     if (1 != have_ld_preload)
328     sandbox_setenv(new_environ, ENV_LD_PRELOAD, ld_preload_envvar);
329 azarah 89
330     if (!getenv(ENV_SANDBOX_DENY))
331     sandbox_setenv(new_environ, ENV_SANDBOX_DENY, LD_PRELOAD_FILE);
332    
333     if (!getenv(ENV_SANDBOX_READ))
334     sandbox_setenv(new_environ, ENV_SANDBOX_READ, "/");
335    
336 azarah 159 if (-1 == get_sandbox_write_envvar(sandbox_write_envvar, sandbox_info))
337     return NULL;
338 azarah 89 if (!getenv(ENV_SANDBOX_WRITE))
339     sandbox_setenv(new_environ, ENV_SANDBOX_WRITE, sandbox_write_envvar);
340    
341 azarah 159 if (-1 == get_sandbox_predict_envvar(sandbox_predict_envvar, sandbox_info))
342     return NULL;
343 azarah 89 if (!getenv(ENV_SANDBOX_PREDICT))
344     sandbox_setenv(new_environ, ENV_SANDBOX_PREDICT, sandbox_predict_envvar);
345    
346 azarah 175 /* Make sure our bashrc gets preference */
347     sandbox_setenv(new_environ, ENV_BASH_ENV, sandbox_info->sandbox_rc);
348    
349 azarah 89 /* This one should NEVER be set in ebuilds, as it is the one
350     * private thing libsandbox.so use to test if the sandbox
351     * should be active for this pid, or not.
352     *
353     * azarah (3 Aug 2002)
354     */
355    
356 azarah 173 sandbox_setenv(new_environ, ENV_SANDBOX_ACTIVE, SANDBOX_ACTIVE);
357 azarah 89
358     env_size = 0;
359     while (NULL != new_environ[env_size])
360     env_size++;
361    
362     /* Now add the rest */
363     env_ptr = environ;
364     while (NULL != *env_ptr) {
365 azarah 100 if ((1 == have_ld_preload) &&
366     (strstr(*env_ptr, LD_PRELOAD_EQ) == *env_ptr))
367     /* If LD_PRELOAD was set, and this is it in the original
368     * environment, replace it with our new copy */
369 azarah 101 /* XXX: The following works as it just add whatever as
370     * the last variable to nev_environ */
371 azarah 100 sandbox_setenv(new_environ, ENV_LD_PRELOAD,
372     ld_preload_envvar);
373     else
374     new_environ[env_size + (env_ptr - environ)] = *env_ptr;
375 azarah 89 env_ptr++;
376 ferringb 2 }
377 azarah 89
378     return new_environ;
379 ferringb 2 }
380    
381 azarah 145 int spawn_shell(char *argv_bash[], char *env[], int debug)
382 ferringb 2 {
383     int pid;
384     int status = 0;
385     int ret = 0;
386    
387     pid = fork();
388    
389     /* Child's process */
390     if (0 == pid) {
391 azarah 89 execve(argv_bash[0], argv_bash, env);
392 ferringb 2 return 0;
393     } else if (pid < 0) {
394 azarah 145 if (debug)
395     fprintf(stderr, "Process failed to spawn!\n");
396 ferringb 2 return 0;
397     }
398     ret = waitpid(pid, &status, 0);
399 azarah 145 if ((-1 == ret) || (status > 0)) {
400     if (debug)
401     fprintf(stderr, "Process returned with failed exit status!\n");
402 ferringb 2 return 0;
403 azarah 145 }
404 azarah 86
405 ferringb 2 return 1;
406     }
407    
408 azarah 30 int main(int argc, char **argv)
409 ferringb 2 {
410 azarah 101 int i = 0, success = 1;
411 ferringb 2 int sandbox_log_presence = 0;
412     long len;
413    
414 azarah 101 struct sandbox_info_t sandbox_info;
415 ferringb 2
416 azarah 89 char **sandbox_environ;
417 ferringb 2 char **argv_bash = NULL;
418    
419     char *run_str = "-c";
420    
421     /* Only print info if called with no arguments .... */
422     if (argc < 2)
423     print_debug = 1;
424    
425     if (print_debug)
426 azarah 30 printf("========================== Gentoo linux path sandbox ===========================\n");
427 ferringb 2
428     /* check if a sandbox is already running */
429 azarah 184 if (NULL != getenv(ENV_SANDBOX_ACTIVE)) {
430 azarah 30 fprintf(stderr, "Not launching a new sandbox instance\n");
431     fprintf(stderr, "Another one is already running in this process hierarchy.\n");
432 azarah 145 exit(EXIT_FAILURE);
433     }
434 ferringb 2
435 azarah 145 /* determine the location of all the sandbox support files */
436     if (print_debug)
437     printf("Detection of the support files.\n");
438 ferringb 2
439 azarah 145 if (-1 == sandbox_setup(&sandbox_info)) {
440 azarah 147 fprintf(stderr, "sandbox: Failed to setup sandbox.");
441 azarah 145 exit(EXIT_FAILURE);
442     }
443    
444     /* verify the existance of required files */
445     if (print_debug)
446     printf("Verification of the required files.\n");
447 ferringb 2
448 azarah 181 #ifndef SB_HAVE_MULTILIB
449 azarah 145 if (0 >= exists(sandbox_info.sandbox_lib)) {
450     perror("sandbox: Could not open the sandbox library");
451     exit(EXIT_FAILURE);
452     }
453 ferringb 2 #endif
454 azarah 145 if (0 >= exists(sandbox_info.sandbox_rc)) {
455     perror("sandbox: Could not open the sandbox rc file");
456     exit(EXIT_FAILURE);
457     }
458 ferringb 2
459 azarah 145 /* set up the required environment variables */
460     if (print_debug)
461     printf("Setting up the required environment variables.\n");
462 ferringb 2
463 azarah 145 /* Setup the child environment stuff */
464     sandbox_environ = sandbox_setup_environ(&sandbox_info);
465     if (NULL == sandbox_environ) {
466     perror("sandbox: Out of memory (environ)");
467     exit(EXIT_FAILURE);
468     }
469 ferringb 2
470 azarah 165 /* If not in portage, cd into it work directory */
471     if ('\0' != sandbox_info.work_dir[0])
472 azarah 157 chdir(sandbox_info.work_dir);
473 ferringb 2
474 azarah 145 argv_bash = (char **)malloc(6 * sizeof(char *));
475     argv_bash[0] = strdup("/bin/bash");
476     argv_bash[1] = strdup("-rcfile");
477     argv_bash[2] = strdup(sandbox_info.sandbox_rc);
478 ferringb 2
479 azarah 145 if (argc < 2)
480     argv_bash[3] = NULL;
481     else
482     argv_bash[3] = strdup(run_str); /* "-c" */
483 ferringb 2
484 azarah 145 argv_bash[4] = NULL; /* strdup(run_arg); */
485     argv_bash[5] = NULL;
486 ferringb 2
487 azarah 145 if (argc >= 2) {
488     for (i = 1; i < argc; i++) {
489     if (NULL == argv_bash[4])
490     len = 0;
491     else
492     len = strlen(argv_bash[4]);
493 ferringb 2
494 azarah 145 argv_bash[4] = (char *)realloc(argv_bash[4],
495     (len + strlen(argv[i]) + 2) * sizeof(char));
496 ferringb 2
497 azarah 145 if (0 == len)
498     argv_bash[4][0] = 0;
499     if (1 != i)
500     strcat(argv_bash[4], " ");
501 ferringb 2
502 azarah 145 strcat(argv_bash[4], argv[i]);
503 ferringb 2 }
504 azarah 145 }
505 ferringb 2
506 azarah 145 /* set up the required signal handlers */
507     signal(SIGHUP, &stop);
508     signal(SIGINT, &stop);
509     signal(SIGQUIT, &stop);
510     signal(SIGTERM, &stop);
511 ferringb 2
512 azarah 145 /* STARTING PROTECTED ENVIRONMENT */
513     if (print_debug) {
514     printf("The protected environment has been started.\n");
515     printf("--------------------------------------------------------------------------------\n");
516     }
517 ferringb 2
518 azarah 145 if (print_debug)
519     printf("Process being started in forked instance.\n");
520 ferringb 2
521 azarah 145 /* Start Bash */
522     if (!spawn_shell(argv_bash, sandbox_environ, print_debug))
523     success = 0;
524 ferringb 2
525 azarah 145 /* Free bash stuff */
526     for (i = 0; i < 6; i++) {
527     if (argv_bash[i])
528     free(argv_bash[i]);
529     argv_bash[i] = NULL;
530     }
531     if (argv_bash)
532     free(argv_bash);
533     argv_bash = NULL;
534 ferringb 2
535 azarah 145 if (print_debug)
536     printf("Cleaning up sandbox process\n");
537 ferringb 2
538 azarah 145 if (print_debug) {
539     printf("========================== Gentoo linux path sandbox ===========================\n");
540     printf("The protected environment has been shut down.\n");
541     }
542 ferringb 2
543 azarah 145 if (1 == exists(sandbox_info.sandbox_log)) {
544     sandbox_log_presence = 1;
545     print_sandbox_log(sandbox_info.sandbox_log);
546     } else if (print_debug) {
547     printf("--------------------------------------------------------------------------------\n");
548     }
549 ferringb 2
550 azarah 145 if ((sandbox_log_presence) || (!success))
551     return 1;
552     else
553     return 0;
554 ferringb 2 }
555    
556 azarah 30 // vim:noexpandtab noai:cindent ai

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