]>
Commit | Line | Data |
---|---|---|
ef416fc2 | 1 | /* |
7e86f2f6 | 2 | * Mini-daemon utility functions for CUPS. |
ef416fc2 | 3 | * |
7e86f2f6 MS |
4 | * Copyright 2007-2014 by Apple Inc. |
5 | * Copyright 1997-2005 by Easy Software Products. | |
ef416fc2 | 6 | * |
7e86f2f6 MS |
7 | * These coded instructions, statements, and computer programs are the |
8 | * property of Apple Inc. and are protected by Federal copyright | |
9 | * law. Distribution and use rights are outlined in the file "LICENSE.txt" | |
10 | * which should have been included with this file. If this file is | |
11 | * file is missing or damaged, see the license at "http://www.cups.org/". | |
ef416fc2 | 12 | */ |
13 | ||
14 | /* | |
15 | * Include necessary headers... | |
16 | */ | |
17 | ||
18 | #include "util.h" | |
c934a06c MS |
19 | #include <unistd.h> |
20 | #include <sys/stat.h> | |
21 | #include <fcntl.h> | |
22 | #ifdef __APPLE__ | |
23 | # include <libgen.h> | |
24 | extern char **environ; | |
88f9aafc | 25 | #endif /* __APPLE__ */ |
ef416fc2 | 26 | |
27 | ||
28 | /* | |
29 | * 'cupsdCompareNames()' - Compare two names. | |
30 | * | |
88f9aafc | 31 | * This function basically does a _cups_strcasecmp() of the two strings, |
ef416fc2 | 32 | * but is also aware of numbers so that "a2" < "a100". |
33 | */ | |
34 | ||
35 | int /* O - Result of comparison */ | |
36 | cupsdCompareNames(const char *s, /* I - First string */ | |
37 | const char *t) /* I - Second string */ | |
38 | { | |
39 | int diff, /* Difference between digits */ | |
40 | digits; /* Number of digits */ | |
41 | ||
42 | ||
43 | /* | |
44 | * Loop through both names, returning only when a difference is | |
45 | * seen. Also, compare whole numbers rather than just characters, too! | |
46 | */ | |
47 | ||
48 | while (*s && *t) | |
49 | { | |
50 | if (isdigit(*s & 255) && isdigit(*t & 255)) | |
51 | { | |
52 | /* | |
53 | * Got a number; start by skipping leading 0's... | |
54 | */ | |
55 | ||
56 | while (*s == '0') | |
57 | s ++; | |
58 | while (*t == '0') | |
59 | t ++; | |
60 | ||
61 | /* | |
62 | * Skip equal digits... | |
63 | */ | |
64 | ||
65 | while (isdigit(*s & 255) && *s == *t) | |
66 | { | |
67 | s ++; | |
68 | t ++; | |
69 | } | |
70 | ||
71 | /* | |
72 | * Bounce out if *s and *t aren't both digits... | |
73 | */ | |
74 | ||
75 | if (isdigit(*s & 255) && !isdigit(*t & 255)) | |
76 | return (1); | |
77 | else if (!isdigit(*s & 255) && isdigit(*t & 255)) | |
78 | return (-1); | |
79 | else if (!isdigit(*s & 255) || !isdigit(*t & 255)) | |
88f9aafc | 80 | continue; |
ef416fc2 | 81 | |
82 | if (*s < *t) | |
83 | diff = -1; | |
84 | else | |
85 | diff = 1; | |
86 | ||
87 | /* | |
88 | * Figure out how many more digits there are... | |
89 | */ | |
90 | ||
91 | digits = 0; | |
92 | s ++; | |
93 | t ++; | |
94 | ||
95 | while (isdigit(*s & 255)) | |
96 | { | |
97 | digits ++; | |
98 | s ++; | |
99 | } | |
100 | ||
101 | while (isdigit(*t & 255)) | |
102 | { | |
103 | digits --; | |
104 | t ++; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Return if the number or value of the digits is different... | |
109 | */ | |
110 | ||
111 | if (digits < 0) | |
112 | return (-1); | |
113 | else if (digits > 0) | |
114 | return (1); | |
115 | else if (diff) | |
116 | return (diff); | |
117 | } | |
118 | else if (tolower(*s) < tolower(*t)) | |
119 | return (-1); | |
120 | else if (tolower(*s) > tolower(*t)) | |
121 | return (1); | |
122 | else | |
123 | { | |
124 | s ++; | |
125 | t ++; | |
126 | } | |
127 | } | |
128 | ||
129 | /* | |
130 | * Return the results of the final comparison... | |
131 | */ | |
132 | ||
133 | if (*s) | |
134 | return (1); | |
135 | else if (*t) | |
136 | return (-1); | |
137 | else | |
138 | return (0); | |
139 | } | |
140 | ||
141 | ||
ed6e7faf MS |
142 | /* |
143 | * 'cupsdCreateStringsArray()' - Create a CUPS array of strings. | |
144 | */ | |
145 | ||
146 | cups_array_t * /* O - CUPS array */ | |
147 | cupsdCreateStringsArray(const char *s) /* I - Comma-delimited strings */ | |
148 | { | |
eac3a0a0 | 149 | if (!s || !*s) |
ed6e7faf | 150 | return (NULL); |
eac3a0a0 | 151 | else |
5a9febac | 152 | return (_cupsArrayNewStrings(s, ',')); |
ed6e7faf MS |
153 | } |
154 | ||
155 | ||
c934a06c MS |
156 | /* |
157 | * 'cupsdExec()' - Run a program with the correct environment. | |
158 | * | |
f3c17241 | 159 | * On OS X, we need to update the CFProcessPath environment variable that |
c934a06c MS |
160 | * is passed in the environment so the child can access its bundled resources. |
161 | */ | |
162 | ||
163 | int /* O - exec() status */ | |
164 | cupsdExec(const char *command, /* I - Full path to program */ | |
165 | char **argv) /* I - Command-line arguments */ | |
166 | { | |
167 | #ifdef __APPLE__ | |
168 | int i, j; /* Looping vars */ | |
169 | char *envp[500], /* Array of environment variables */ | |
170 | cfprocesspath[1024], /* CFProcessPath environment variable */ | |
171 | linkpath[1024]; /* Link path for symlinks... */ | |
172 | int linkbytes; /* Bytes for link path */ | |
173 | ||
174 | ||
175 | /* | |
f3c17241 | 176 | * Some OS X programs are bundled and need the CFProcessPath environment |
c934a06c MS |
177 | * variable defined. If the command is a symlink, resolve the link and point |
178 | * to the resolved location, otherwise, use the command path itself. | |
179 | */ | |
180 | ||
181 | if ((linkbytes = readlink(command, linkpath, sizeof(linkpath) - 1)) > 0) | |
182 | { | |
183 | /* | |
184 | * Yes, this is a symlink to the actual program, nul-terminate and | |
185 | * use it... | |
186 | */ | |
187 | ||
188 | linkpath[linkbytes] = '\0'; | |
189 | ||
190 | if (linkpath[0] == '/') | |
191 | snprintf(cfprocesspath, sizeof(cfprocesspath), "CFProcessPath=%s", | |
192 | linkpath); | |
193 | else | |
194 | snprintf(cfprocesspath, sizeof(cfprocesspath), "CFProcessPath=%s/%s", | |
195 | dirname((char *)command), linkpath); | |
196 | } | |
197 | else | |
198 | snprintf(cfprocesspath, sizeof(cfprocesspath), "CFProcessPath=%s", command); | |
199 | ||
200 | envp[0] = cfprocesspath; | |
201 | ||
202 | /* | |
203 | * Copy the rest of the environment except for any CFProcessPath that may | |
204 | * already be there... | |
205 | */ | |
206 | ||
207 | for (i = 1, j = 0; | |
208 | environ[j] && i < (int)(sizeof(envp) / sizeof(envp[0]) - 1); | |
209 | j ++) | |
210 | if (strncmp(environ[j], "CFProcessPath=", 14)) | |
211 | envp[i ++] = environ[j]; | |
212 | ||
213 | envp[i] = NULL; | |
214 | ||
215 | /* | |
216 | * Use execve() to run the program... | |
217 | */ | |
218 | ||
219 | return (execve(command, argv, envp)); | |
220 | ||
221 | #else | |
222 | /* | |
223 | * On other operating systems, just call execv() to use the same environment | |
224 | * variables as the parent... | |
225 | */ | |
226 | ||
227 | return (execv(command, argv)); | |
228 | #endif /* __APPLE__ */ | |
229 | } | |
230 | ||
231 | ||
232 | /* | |
233 | * 'cupsdPipeCommand()' - Read output from a command. | |
234 | */ | |
235 | ||
236 | cups_file_t * /* O - CUPS file or NULL on error */ | |
237 | cupsdPipeCommand(int *pid, /* O - Process ID or 0 on error */ | |
238 | const char *command, /* I - Command to run */ | |
239 | char **argv, /* I - Arguments to pass to command */ | |
7e86f2f6 | 240 | uid_t user) /* I - User to run as or 0 for current */ |
c934a06c | 241 | { |
97c9a8d7 MS |
242 | int fd, /* Temporary file descriptor */ |
243 | fds[2]; /* Pipe file descriptors */ | |
c934a06c MS |
244 | |
245 | ||
246 | /* | |
247 | * First create the pipe... | |
248 | */ | |
249 | ||
250 | if (pipe(fds)) | |
251 | { | |
252 | *pid = 0; | |
253 | return (NULL); | |
254 | } | |
255 | ||
256 | /* | |
257 | * Set the "close on exec" flag on each end of the pipe... | |
258 | */ | |
259 | ||
260 | if (fcntl(fds[0], F_SETFD, fcntl(fds[0], F_GETFD) | FD_CLOEXEC)) | |
261 | { | |
262 | close(fds[0]); | |
263 | close(fds[1]); | |
264 | ||
265 | *pid = 0; | |
266 | ||
267 | return (NULL); | |
268 | } | |
269 | ||
270 | if (fcntl(fds[1], F_SETFD, fcntl(fds[1], F_GETFD) | FD_CLOEXEC)) | |
271 | { | |
272 | close(fds[0]); | |
273 | close(fds[1]); | |
274 | ||
275 | *pid = 0; | |
276 | ||
277 | return (NULL); | |
278 | } | |
279 | ||
280 | /* | |
281 | * Then run the command... | |
282 | */ | |
283 | ||
284 | if ((*pid = fork()) < 0) | |
285 | { | |
286 | /* | |
287 | * Unable to fork! | |
288 | */ | |
289 | ||
290 | *pid = 0; | |
291 | close(fds[0]); | |
292 | close(fds[1]); | |
293 | ||
294 | return (NULL); | |
295 | } | |
296 | else if (!*pid) | |
297 | { | |
298 | /* | |
299 | * Child comes here... | |
300 | */ | |
301 | ||
302 | if (!getuid() && user) | |
303 | setuid(user); /* Run as restricted user */ | |
304 | ||
97c9a8d7 MS |
305 | if ((fd = open("/dev/null", O_RDONLY)) > 0) |
306 | { | |
307 | dup2(fd, 0); /* </dev/null */ | |
308 | close(fd); | |
309 | } | |
c934a06c | 310 | |
97c9a8d7 MS |
311 | dup2(fds[1], 1); /* >pipe */ |
312 | close(fds[1]); | |
c934a06c MS |
313 | |
314 | cupsdExec(command, argv); | |
315 | exit(errno); | |
316 | } | |
317 | ||
318 | /* | |
319 | * Parent comes here, open the input side of the pipe... | |
320 | */ | |
321 | ||
322 | close(fds[1]); | |
323 | ||
324 | return (cupsFileOpenFd(fds[0], "r")); | |
325 | } | |
326 | ||
327 | ||
ef416fc2 | 328 | /* |
329 | * 'cupsdSendIPPGroup()' - Send a group tag. | |
330 | */ | |
331 | ||
332 | void | |
333 | cupsdSendIPPGroup(ipp_tag_t group_tag) /* I - Group tag */ | |
334 | { | |
335 | /* | |
336 | * Send IPP group tag (1 byte)... | |
337 | */ | |
338 | ||
339 | putchar(group_tag); | |
340 | } | |
341 | ||
342 | ||
343 | /* | |
344 | * 'cupsdSendIPPHeader()' - Send the IPP response header. | |
345 | */ | |
346 | ||
347 | void | |
348 | cupsdSendIPPHeader( | |
349 | ipp_status_t status_code, /* I - Status code */ | |
350 | int request_id) /* I - Request ID */ | |
351 | { | |
352 | /* | |
353 | * Send IPP/1.1 response header: version number (2 bytes), status code | |
354 | * (2 bytes), and request ID (4 bytes)... | |
94da7e34 MS |
355 | * |
356 | * TODO: Add version number (IPP/2.x and IPP/1.0) support. | |
ef416fc2 | 357 | */ |
358 | ||
359 | putchar(1); | |
360 | putchar(1); | |
361 | ||
362 | putchar(status_code >> 8); | |
363 | putchar(status_code); | |
364 | ||
365 | putchar(request_id >> 24); | |
366 | putchar(request_id >> 16); | |
367 | putchar(request_id >> 8); | |
368 | putchar(request_id); | |
369 | } | |
370 | ||
371 | ||
372 | /* | |
373 | * 'cupsdSendIPPInteger()' - Send an integer attribute. | |
374 | */ | |
375 | ||
376 | void | |
377 | cupsdSendIPPInteger( | |
378 | ipp_tag_t value_tag, /* I - Value tag */ | |
379 | const char *name, /* I - Attribute name */ | |
380 | int value) /* I - Attribute value */ | |
381 | { | |
382 | size_t len; /* Length of attribute name */ | |
383 | ||
384 | ||
385 | /* | |
386 | * Send IPP integer value: value tag (1 byte), name length (2 bytes), | |
3d8365b8 | 387 | * name string (without nul), value length (2 bytes), and value (4 bytes)... |
ef416fc2 | 388 | */ |
389 | ||
390 | putchar(value_tag); | |
391 | ||
392 | len = strlen(name); | |
7e86f2f6 MS |
393 | putchar((int)(len >> 8)); |
394 | putchar((int)len); | |
ef416fc2 | 395 | |
396 | fputs(name, stdout); | |
397 | ||
3d8365b8 | 398 | putchar(0); |
399 | putchar(4); | |
400 | ||
ef416fc2 | 401 | putchar(value >> 24); |
402 | putchar(value >> 16); | |
403 | putchar(value >> 8); | |
404 | putchar(value); | |
405 | } | |
406 | ||
407 | ||
408 | /* | |
409 | * 'cupsdSendIPPString()' - Send a string attribute. | |
410 | */ | |
411 | ||
412 | void | |
413 | cupsdSendIPPString( | |
414 | ipp_tag_t value_tag, /* I - Value tag */ | |
415 | const char *name, /* I - Attribute name */ | |
416 | const char *value) /* I - Attribute value */ | |
417 | { | |
418 | size_t len; /* Length of attribute name */ | |
419 | ||
420 | ||
421 | /* | |
422 | * Send IPP string value: value tag (1 byte), name length (2 bytes), | |
423 | * name string (without nul), value length (2 bytes), and value string | |
424 | * (without nul)... | |
425 | */ | |
426 | ||
427 | putchar(value_tag); | |
428 | ||
429 | len = strlen(name); | |
7e86f2f6 MS |
430 | putchar((int)(len >> 8)); |
431 | putchar((int)len); | |
ef416fc2 | 432 | |
433 | fputs(name, stdout); | |
434 | ||
435 | len = strlen(value); | |
7e86f2f6 MS |
436 | putchar((int)(len >> 8)); |
437 | putchar((int)len); | |
ef416fc2 | 438 | |
439 | fputs(value, stdout); | |
440 | } | |
441 | ||
442 | ||
443 | /* | |
444 | * 'cupsdSendIPPTrailer()' - Send the end-of-message tag. | |
445 | */ | |
446 | ||
447 | void | |
448 | cupsdSendIPPTrailer(void) | |
449 | { | |
450 | putchar(IPP_TAG_END); | |
451 | fflush(stdout); | |
452 | } |