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Commit | Line | Data |
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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 | * |
e3101897 | 7 | * Licensed under Apache License v2.0. See the file "LICENSE" for more information. |
ef416fc2 | 8 | */ |
9 | ||
10 | /* | |
11 | * Include necessary headers... | |
12 | */ | |
13 | ||
14 | #include "util.h" | |
c934a06c MS |
15 | #include <unistd.h> |
16 | #include <sys/stat.h> | |
17 | #include <fcntl.h> | |
18 | #ifdef __APPLE__ | |
19 | # include <libgen.h> | |
20 | extern char **environ; | |
88f9aafc | 21 | #endif /* __APPLE__ */ |
ef416fc2 | 22 | |
23 | ||
24 | /* | |
25 | * 'cupsdCompareNames()' - Compare two names. | |
26 | * | |
88f9aafc | 27 | * This function basically does a _cups_strcasecmp() of the two strings, |
ef416fc2 | 28 | * but is also aware of numbers so that "a2" < "a100". |
29 | */ | |
30 | ||
31 | int /* O - Result of comparison */ | |
32 | cupsdCompareNames(const char *s, /* I - First string */ | |
33 | const char *t) /* I - Second string */ | |
34 | { | |
35 | int diff, /* Difference between digits */ | |
36 | digits; /* Number of digits */ | |
37 | ||
38 | ||
39 | /* | |
40 | * Loop through both names, returning only when a difference is | |
41 | * seen. Also, compare whole numbers rather than just characters, too! | |
42 | */ | |
43 | ||
44 | while (*s && *t) | |
45 | { | |
46 | if (isdigit(*s & 255) && isdigit(*t & 255)) | |
47 | { | |
48 | /* | |
49 | * Got a number; start by skipping leading 0's... | |
50 | */ | |
51 | ||
52 | while (*s == '0') | |
53 | s ++; | |
54 | while (*t == '0') | |
55 | t ++; | |
56 | ||
57 | /* | |
58 | * Skip equal digits... | |
59 | */ | |
60 | ||
61 | while (isdigit(*s & 255) && *s == *t) | |
62 | { | |
63 | s ++; | |
64 | t ++; | |
65 | } | |
66 | ||
67 | /* | |
68 | * Bounce out if *s and *t aren't both digits... | |
69 | */ | |
70 | ||
71 | if (isdigit(*s & 255) && !isdigit(*t & 255)) | |
72 | return (1); | |
73 | else if (!isdigit(*s & 255) && isdigit(*t & 255)) | |
74 | return (-1); | |
75 | else if (!isdigit(*s & 255) || !isdigit(*t & 255)) | |
88f9aafc | 76 | continue; |
ef416fc2 | 77 | |
78 | if (*s < *t) | |
79 | diff = -1; | |
80 | else | |
81 | diff = 1; | |
82 | ||
83 | /* | |
84 | * Figure out how many more digits there are... | |
85 | */ | |
86 | ||
87 | digits = 0; | |
88 | s ++; | |
89 | t ++; | |
90 | ||
91 | while (isdigit(*s & 255)) | |
92 | { | |
93 | digits ++; | |
94 | s ++; | |
95 | } | |
96 | ||
97 | while (isdigit(*t & 255)) | |
98 | { | |
99 | digits --; | |
100 | t ++; | |
101 | } | |
102 | ||
103 | /* | |
104 | * Return if the number or value of the digits is different... | |
105 | */ | |
106 | ||
107 | if (digits < 0) | |
108 | return (-1); | |
109 | else if (digits > 0) | |
110 | return (1); | |
111 | else if (diff) | |
112 | return (diff); | |
113 | } | |
114 | else if (tolower(*s) < tolower(*t)) | |
115 | return (-1); | |
116 | else if (tolower(*s) > tolower(*t)) | |
117 | return (1); | |
118 | else | |
119 | { | |
120 | s ++; | |
121 | t ++; | |
122 | } | |
123 | } | |
124 | ||
125 | /* | |
126 | * Return the results of the final comparison... | |
127 | */ | |
128 | ||
129 | if (*s) | |
130 | return (1); | |
131 | else if (*t) | |
132 | return (-1); | |
133 | else | |
134 | return (0); | |
135 | } | |
136 | ||
137 | ||
ed6e7faf MS |
138 | /* |
139 | * 'cupsdCreateStringsArray()' - Create a CUPS array of strings. | |
140 | */ | |
141 | ||
142 | cups_array_t * /* O - CUPS array */ | |
143 | cupsdCreateStringsArray(const char *s) /* I - Comma-delimited strings */ | |
144 | { | |
eac3a0a0 | 145 | if (!s || !*s) |
ed6e7faf | 146 | return (NULL); |
eac3a0a0 | 147 | else |
5a9febac | 148 | return (_cupsArrayNewStrings(s, ',')); |
ed6e7faf MS |
149 | } |
150 | ||
151 | ||
c934a06c MS |
152 | /* |
153 | * 'cupsdExec()' - Run a program with the correct environment. | |
154 | * | |
8072030b | 155 | * On macOS, we need to update the CFProcessPath environment variable that |
c934a06c MS |
156 | * is passed in the environment so the child can access its bundled resources. |
157 | */ | |
158 | ||
159 | int /* O - exec() status */ | |
160 | cupsdExec(const char *command, /* I - Full path to program */ | |
161 | char **argv) /* I - Command-line arguments */ | |
162 | { | |
163 | #ifdef __APPLE__ | |
164 | int i, j; /* Looping vars */ | |
165 | char *envp[500], /* Array of environment variables */ | |
166 | cfprocesspath[1024], /* CFProcessPath environment variable */ | |
167 | linkpath[1024]; /* Link path for symlinks... */ | |
168 | int linkbytes; /* Bytes for link path */ | |
169 | ||
170 | ||
171 | /* | |
8072030b | 172 | * Some macOS programs are bundled and need the CFProcessPath environment |
c934a06c MS |
173 | * variable defined. If the command is a symlink, resolve the link and point |
174 | * to the resolved location, otherwise, use the command path itself. | |
175 | */ | |
176 | ||
177 | if ((linkbytes = readlink(command, linkpath, sizeof(linkpath) - 1)) > 0) | |
178 | { | |
179 | /* | |
180 | * Yes, this is a symlink to the actual program, nul-terminate and | |
181 | * use it... | |
182 | */ | |
183 | ||
184 | linkpath[linkbytes] = '\0'; | |
185 | ||
186 | if (linkpath[0] == '/') | |
187 | snprintf(cfprocesspath, sizeof(cfprocesspath), "CFProcessPath=%s", | |
188 | linkpath); | |
189 | else | |
190 | snprintf(cfprocesspath, sizeof(cfprocesspath), "CFProcessPath=%s/%s", | |
191 | dirname((char *)command), linkpath); | |
192 | } | |
193 | else | |
194 | snprintf(cfprocesspath, sizeof(cfprocesspath), "CFProcessPath=%s", command); | |
195 | ||
196 | envp[0] = cfprocesspath; | |
197 | ||
198 | /* | |
199 | * Copy the rest of the environment except for any CFProcessPath that may | |
200 | * already be there... | |
201 | */ | |
202 | ||
203 | for (i = 1, j = 0; | |
204 | environ[j] && i < (int)(sizeof(envp) / sizeof(envp[0]) - 1); | |
205 | j ++) | |
206 | if (strncmp(environ[j], "CFProcessPath=", 14)) | |
207 | envp[i ++] = environ[j]; | |
208 | ||
209 | envp[i] = NULL; | |
210 | ||
211 | /* | |
212 | * Use execve() to run the program... | |
213 | */ | |
214 | ||
215 | return (execve(command, argv, envp)); | |
216 | ||
217 | #else | |
218 | /* | |
219 | * On other operating systems, just call execv() to use the same environment | |
220 | * variables as the parent... | |
221 | */ | |
222 | ||
223 | return (execv(command, argv)); | |
224 | #endif /* __APPLE__ */ | |
225 | } | |
226 | ||
227 | ||
228 | /* | |
229 | * 'cupsdPipeCommand()' - Read output from a command. | |
230 | */ | |
231 | ||
232 | cups_file_t * /* O - CUPS file or NULL on error */ | |
233 | cupsdPipeCommand(int *pid, /* O - Process ID or 0 on error */ | |
234 | const char *command, /* I - Command to run */ | |
235 | char **argv, /* I - Arguments to pass to command */ | |
7e86f2f6 | 236 | uid_t user) /* I - User to run as or 0 for current */ |
c934a06c | 237 | { |
97c9a8d7 MS |
238 | int fd, /* Temporary file descriptor */ |
239 | fds[2]; /* Pipe file descriptors */ | |
c934a06c MS |
240 | |
241 | ||
242 | /* | |
243 | * First create the pipe... | |
244 | */ | |
245 | ||
246 | if (pipe(fds)) | |
247 | { | |
248 | *pid = 0; | |
249 | return (NULL); | |
250 | } | |
251 | ||
252 | /* | |
253 | * Set the "close on exec" flag on each end of the pipe... | |
254 | */ | |
255 | ||
256 | if (fcntl(fds[0], F_SETFD, fcntl(fds[0], F_GETFD) | FD_CLOEXEC)) | |
257 | { | |
258 | close(fds[0]); | |
259 | close(fds[1]); | |
260 | ||
261 | *pid = 0; | |
262 | ||
263 | return (NULL); | |
264 | } | |
265 | ||
266 | if (fcntl(fds[1], F_SETFD, fcntl(fds[1], F_GETFD) | FD_CLOEXEC)) | |
267 | { | |
268 | close(fds[0]); | |
269 | close(fds[1]); | |
270 | ||
271 | *pid = 0; | |
272 | ||
273 | return (NULL); | |
274 | } | |
275 | ||
276 | /* | |
277 | * Then run the command... | |
278 | */ | |
279 | ||
280 | if ((*pid = fork()) < 0) | |
281 | { | |
282 | /* | |
283 | * Unable to fork! | |
284 | */ | |
285 | ||
286 | *pid = 0; | |
287 | close(fds[0]); | |
288 | close(fds[1]); | |
289 | ||
290 | return (NULL); | |
291 | } | |
292 | else if (!*pid) | |
293 | { | |
294 | /* | |
295 | * Child comes here... | |
296 | */ | |
297 | ||
298 | if (!getuid() && user) | |
299 | setuid(user); /* Run as restricted user */ | |
300 | ||
97c9a8d7 MS |
301 | if ((fd = open("/dev/null", O_RDONLY)) > 0) |
302 | { | |
303 | dup2(fd, 0); /* </dev/null */ | |
304 | close(fd); | |
305 | } | |
c934a06c | 306 | |
97c9a8d7 MS |
307 | dup2(fds[1], 1); /* >pipe */ |
308 | close(fds[1]); | |
c934a06c MS |
309 | |
310 | cupsdExec(command, argv); | |
311 | exit(errno); | |
312 | } | |
313 | ||
314 | /* | |
315 | * Parent comes here, open the input side of the pipe... | |
316 | */ | |
317 | ||
318 | close(fds[1]); | |
319 | ||
320 | return (cupsFileOpenFd(fds[0], "r")); | |
321 | } | |
322 | ||
323 | ||
ef416fc2 | 324 | /* |
325 | * 'cupsdSendIPPGroup()' - Send a group tag. | |
326 | */ | |
327 | ||
328 | void | |
329 | cupsdSendIPPGroup(ipp_tag_t group_tag) /* I - Group tag */ | |
330 | { | |
331 | /* | |
332 | * Send IPP group tag (1 byte)... | |
333 | */ | |
334 | ||
335 | putchar(group_tag); | |
336 | } | |
337 | ||
338 | ||
339 | /* | |
340 | * 'cupsdSendIPPHeader()' - Send the IPP response header. | |
341 | */ | |
342 | ||
343 | void | |
344 | cupsdSendIPPHeader( | |
345 | ipp_status_t status_code, /* I - Status code */ | |
346 | int request_id) /* I - Request ID */ | |
347 | { | |
348 | /* | |
349 | * Send IPP/1.1 response header: version number (2 bytes), status code | |
350 | * (2 bytes), and request ID (4 bytes)... | |
94da7e34 MS |
351 | * |
352 | * TODO: Add version number (IPP/2.x and IPP/1.0) support. | |
ef416fc2 | 353 | */ |
354 | ||
355 | putchar(1); | |
356 | putchar(1); | |
357 | ||
358 | putchar(status_code >> 8); | |
359 | putchar(status_code); | |
360 | ||
361 | putchar(request_id >> 24); | |
362 | putchar(request_id >> 16); | |
363 | putchar(request_id >> 8); | |
364 | putchar(request_id); | |
365 | } | |
366 | ||
367 | ||
368 | /* | |
369 | * 'cupsdSendIPPInteger()' - Send an integer attribute. | |
370 | */ | |
371 | ||
372 | void | |
373 | cupsdSendIPPInteger( | |
374 | ipp_tag_t value_tag, /* I - Value tag */ | |
375 | const char *name, /* I - Attribute name */ | |
376 | int value) /* I - Attribute value */ | |
377 | { | |
378 | size_t len; /* Length of attribute name */ | |
379 | ||
380 | ||
381 | /* | |
382 | * Send IPP integer value: value tag (1 byte), name length (2 bytes), | |
3d8365b8 | 383 | * name string (without nul), value length (2 bytes), and value (4 bytes)... |
ef416fc2 | 384 | */ |
385 | ||
386 | putchar(value_tag); | |
387 | ||
388 | len = strlen(name); | |
7e86f2f6 MS |
389 | putchar((int)(len >> 8)); |
390 | putchar((int)len); | |
ef416fc2 | 391 | |
392 | fputs(name, stdout); | |
393 | ||
3d8365b8 | 394 | putchar(0); |
395 | putchar(4); | |
396 | ||
ef416fc2 | 397 | putchar(value >> 24); |
398 | putchar(value >> 16); | |
399 | putchar(value >> 8); | |
400 | putchar(value); | |
401 | } | |
402 | ||
403 | ||
404 | /* | |
405 | * 'cupsdSendIPPString()' - Send a string attribute. | |
406 | */ | |
407 | ||
408 | void | |
409 | cupsdSendIPPString( | |
410 | ipp_tag_t value_tag, /* I - Value tag */ | |
411 | const char *name, /* I - Attribute name */ | |
412 | const char *value) /* I - Attribute value */ | |
413 | { | |
414 | size_t len; /* Length of attribute name */ | |
415 | ||
416 | ||
417 | /* | |
418 | * Send IPP string value: value tag (1 byte), name length (2 bytes), | |
419 | * name string (without nul), value length (2 bytes), and value string | |
420 | * (without nul)... | |
421 | */ | |
422 | ||
423 | putchar(value_tag); | |
424 | ||
425 | len = strlen(name); | |
7e86f2f6 MS |
426 | putchar((int)(len >> 8)); |
427 | putchar((int)len); | |
ef416fc2 | 428 | |
429 | fputs(name, stdout); | |
430 | ||
431 | len = strlen(value); | |
7e86f2f6 MS |
432 | putchar((int)(len >> 8)); |
433 | putchar((int)len); | |
ef416fc2 | 434 | |
435 | fputs(value, stdout); | |
436 | } | |
437 | ||
438 | ||
439 | /* | |
440 | * 'cupsdSendIPPTrailer()' - Send the end-of-message tag. | |
441 | */ | |
442 | ||
443 | void | |
444 | cupsdSendIPPTrailer(void) | |
445 | { | |
446 | putchar(IPP_TAG_END); | |
447 | fflush(stdout); | |
448 | } |