]>
git.ipfire.org Git - thirdparty/cups.git/blob - scheduler/process.c
2 * "$Id: process.c 6987 2007-09-25 15:43:44Z mike $"
4 * Process management routines for the Common UNIX Printing System (CUPS).
6 * Copyright 2007 by Apple Inc.
7 * Copyright 1997-2007 by Easy Software Products, all rights reserved.
9 * These coded instructions, statements, and computer programs are the
10 * property of Apple Inc. and are protected by Federal copyright
11 * law. Distribution and use rights are outlined in the file "LICENSE.txt"
12 * which should have been included with this file. If this file is
13 * file is missing or damaged, see the license at "http://www.cups.org/".
17 * cupsdCreateProfile() - Create an execution profile for a subprocess.
18 * cupsdDestroyProfile() - Delete an execution profile.
19 * cupsdEndProcess() - End a process.
20 * cupsdFinishProcess() - Finish a process and get its name.
21 * cupsdStartProcess() - Start a process.
22 * compare_procs() - Compare two processes.
23 * cupsd_requote() - Make a regular-expression version of a string.
27 * Include necessary headers...
34 #endif /* __APPLE__ */
36 # define __APPLE_API_PRIVATE
38 #endif /* HAVE_SANDBOX_H */
42 * Process structure...
47 int pid
; /* Process ID */
48 char name
[1]; /* Name of process */
56 static cups_array_t
*process_array
= NULL
;
63 static int compare_procs(cupsd_proc_t
*a
, cupsd_proc_t
*b
);
65 static char *cupsd_requote(char *dst
, const char *src
, size_t dstsize
);
66 #endif /* HAVE_SANDBOX_H */
70 * 'cupsdCreateProfile()' - Create an execution profile for a subprocess.
73 void * /* O - Profile or NULL on error */
74 cupsdCreateProfile(int job_id
) /* I - Job ID or 0 for none */
77 cups_file_t
*fp
; /* File pointer */
78 char profile
[1024], /* File containing the profile */
79 cache
[1024], /* Quoted CacheDir */
80 request
[1024], /* Quoted RequestRoot */
81 root
[1024], /* Quoted ServerRoot */
82 temp
[1024]; /* Quoted TempDir */
85 if ((fp
= cupsTempFile2(profile
, sizeof(profile
))) == NULL
)
87 cupsdLogMessage(CUPSD_LOG_ERROR
, "Unable to create security profile: %s",
92 cupsd_requote(cache
, CacheDir
, sizeof(cache
));
93 cupsd_requote(request
, RequestRoot
, sizeof(request
));
94 cupsd_requote(root
, ServerRoot
, sizeof(root
));
95 cupsd_requote(temp
, TempDir
, sizeof(temp
));
97 cupsFilePuts(fp
, "(version 1)\n");
98 cupsFilePuts(fp
, "(debug deny)\n");
99 cupsFilePuts(fp
, "(allow default)\n");
101 "(deny file-write* file-read-data file-read-metadata\n"
102 " (regex #\"^%s\"))\n", request
);
104 "(deny file-write*\n"
105 " (regex #\"^%s\" #\"^/private/etc\" #\"^/usr/local/etc\" "
106 "#\"^/Library\" #\"^/System\"))\n", root
);
108 "(allow file-write* file-read-data file-read-metadata\n"
109 " (regex #\"^%s$\" #\"^%s/\" #\"^%s$\" #\"^%s/\"))\n",
110 temp
, temp
, cache
, cache
);
113 "(allow file-read-data file-read-metadata\n"
114 " (regex #\"^%s/([ac]%05d|d%05d-[0-9][0-9][0-9])$\"))\n",
119 return ((void *)strdup(profile
));
123 #endif /* HAVE_SANDBOX_H */
128 * 'cupsdDestroyProfile()' - Delete an execution profile.
132 cupsdDestroyProfile(void *profile
) /* I - Profile */
134 #ifdef HAVE_SANDBOX_H
137 unlink((char *)profile
);
140 #endif /* HAVE_SANDBOX_H */
145 * 'cupsdEndProcess()' - End a process.
148 int /* O - 0 on success, -1 on failure */
149 cupsdEndProcess(int pid
, /* I - Process ID */
150 int force
) /* I - Force child to die */
153 return (kill(pid
, SIGKILL
));
155 return (kill(pid
, SIGTERM
));
160 * 'cupsdFinishProcess()' - Finish a process and get its name.
163 const char * /* O - Process name */
164 cupsdFinishProcess(int pid
, /* I - Process ID */
165 char *name
, /* I - Name buffer */
166 int namelen
) /* I - Size of name buffer */
168 cupsd_proc_t key
, /* Search key */
169 *proc
; /* Matching process */
174 if ((proc
= (cupsd_proc_t
*)cupsArrayFind(process_array
, &key
)) != NULL
)
176 strlcpy(name
, proc
->name
, namelen
);
177 cupsArrayRemove(process_array
, proc
);
188 * 'cupsdStartProcess()' - Start a process.
191 int /* O - Process ID or 0 */
193 const char *command
, /* I - Full path to command */
194 char *argv
[], /* I - Command-line arguments */
195 char *envp
[], /* I - Environment */
196 int infd
, /* I - Standard input file descriptor */
197 int outfd
, /* I - Standard output file descriptor */
198 int errfd
, /* I - Standard error file descriptor */
199 int backfd
, /* I - Backchannel file descriptor */
200 int sidefd
, /* I - Sidechannel file descriptor */
201 int root
, /* I - Run as root? */
202 void *profile
, /* I - Security profile to use */
203 int *pid
) /* O - Process ID */
205 cupsd_proc_t
*proc
; /* New process record */
206 #if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
207 struct sigaction action
; /* POSIX signal handler */
208 #endif /* HAVE_SIGACTION && !HAVE_SIGSET */
209 #if defined(__APPLE__)
210 char processPath
[1024], /* CFProcessPath environment variable */
211 linkpath
[1024]; /* Link path for symlinks... */
212 int linkbytes
; /* Bytes for link path */
213 #endif /* __APPLE__ */
216 cupsdLogMessage(CUPSD_LOG_DEBUG2
,
217 "cupsdStartProcess(\"%s\", %p, %p, %d, %d, %d)",
218 command
, argv
, envp
, infd
, outfd
, errfd
);
220 if (access(command
, X_OK
))
222 cupsdLogMessage(CUPSD_LOG_ERROR
, "Unable to execute %s: %s", command
,
228 #if defined(__APPLE__)
232 * Add special voodoo magic for MacOS X - this allows MacOS X
233 * programs to access their bundle resources properly...
236 if ((linkbytes
= readlink(command
, linkpath
, sizeof(linkpath
) - 1)) > 0)
239 * Yes, this is a symlink to the actual program, nul-terminate and
243 linkpath
[linkbytes
] = '\0';
245 if (linkpath
[0] == '/')
246 snprintf(processPath
, sizeof(processPath
), "CFProcessPath=%s",
249 snprintf(processPath
, sizeof(processPath
), "CFProcessPath=%s/%s",
250 dirname((char *)command
), linkpath
);
253 snprintf(processPath
, sizeof(processPath
), "CFProcessPath=%s", command
);
255 envp
[0] = processPath
; /* Replace <CFProcessPath> string */
257 #endif /* __APPLE__ */
260 * Block signals before forking...
265 if ((*pid
= fork()) == 0)
268 * Child process goes here...
270 * Update stdin/stdout/stderr as needed...
279 open("/dev/null", O_RDONLY
);
287 open("/dev/null", O_WRONLY
);
295 open("/dev/null", O_WRONLY
);
303 open("/dev/null", O_RDWR
);
304 fcntl(3, F_SETFL
, O_NDELAY
);
306 if (sidefd
!= 4 && sidefd
> 0)
310 fcntl(4, F_SETFL
, O_NDELAY
);
314 * Change the priority of the process based on the FilterNice setting.
315 * (this is not done for backends...)
322 * Change user to something "safe"...
325 if (!root
&& !RunUser
)
328 * Running as root, so change to non-priviledged user...
334 if (setgroups(1, &Group
))
343 * Reset group membership to just the main one we belong to.
347 setgroups(1, &Group
);
351 * Change umask to restrict permissions on created files...
357 * Unblock signals before doing the exec...
361 sigset(SIGTERM
, SIG_DFL
);
362 sigset(SIGCHLD
, SIG_DFL
);
363 #elif defined(HAVE_SIGACTION)
364 memset(&action
, 0, sizeof(action
));
366 sigemptyset(&action
.sa_mask
);
367 action
.sa_handler
= SIG_DFL
;
369 sigaction(SIGTERM
, &action
, NULL
);
370 sigaction(SIGCHLD
, &action
, NULL
);
372 signal(SIGTERM
, SIG_DFL
);
373 signal(SIGCHLD
, SIG_DFL
);
374 #endif /* HAVE_SIGSET */
376 cupsdReleaseSignals();
378 #ifdef HAVE_SANDBOX_H
380 * Run in a separate security profile...
385 char *error
; /* Sandbox error, if any */
387 if (sandbox_init((char *)profile
, SANDBOX_NAMED_EXTERNAL
, &error
))
389 fprintf(stderr
, "ERROR: sandbox_init failed: %s (%s)\n", error
,
391 sandbox_free_error(error
);
394 #endif /* HAVE_SANDBOX_H */
397 * Execute the command; if for some reason this doesn't work,
398 * return the error code...
402 execve(command
, argv
, envp
);
404 execv(command
, argv
);
413 * Error - couldn't fork a new process!
416 cupsdLogMessage(CUPSD_LOG_ERROR
, "Unable to fork %s - %s.", command
,
424 process_array
= cupsArrayNew((cups_array_func_t
)compare_procs
, NULL
);
428 if ((proc
= calloc(1, sizeof(cupsd_proc_t
) + strlen(command
))) != NULL
)
431 strcpy(proc
->name
, command
);
433 cupsArrayAdd(process_array
, proc
);
438 cupsdReleaseSignals();
445 * 'compare_procs()' - Compare two processes.
448 static int /* O - Result of comparison */
449 compare_procs(cupsd_proc_t
*a
, /* I - First process */
450 cupsd_proc_t
*b
) /* I - Second process */
452 return (a
->pid
- b
->pid
);
456 #ifdef HAVE_SANDBOX_H
458 * 'cupsd_requote()' - Make a regular-expression version of a string.
461 static char * /* O - Quoted string */
462 cupsd_requote(char *dst
, /* I - Destination buffer */
463 const char *src
, /* I - Source string */
464 size_t dstsize
) /* I - Size of destination buffer */
466 int ch
; /* Current character */
467 char *dstptr
, /* Current position in buffer */
468 *dstend
; /* End of destination buffer */
472 dstend
= dst
+ dstsize
- 2;
474 while (*src
&& dstptr
< dstend
)
478 if (strchr(".?*()[]^$\\", ch
))
488 #endif /* HAVE_SANDBOX_H */
492 * End of "$Id: process.c 6987 2007-09-25 15:43:44Z mike $".