1#include <stdio.h>
2#include <stdlib.h>
3#include <sys/types.h>
4#include <sys/stat.h>
5#include <string.h>
6#include <unistd.h>
7#include <time.h>
8#include <fcntl.h>
9#include <errno.h>
10#include <ctype.h>
11#include <limits.h>
12
13
14
15
16
17
18
19
20#define xstr(s) #s
21#define str(s) xstr(s)
22
23static unsigned int offset;
24static unsigned int ino = 721;
25static time_t default_mtime;
26
27struct file_handler {
28 const char *type;
29 int (*handler)(const char *line);
30};
31
32static void push_string(const char *name)
33{
34 unsigned int name_len = strlen(name) + 1;
35
36 fputs(name, stdout);
37 putchar(0);
38 offset += name_len;
39}
40
41static void push_pad (void)
42{
43 while (offset & 3) {
44 putchar(0);
45 offset++;
46 }
47}
48
49static void push_rest(const char *name)
50{
51 unsigned int name_len = strlen(name) + 1;
52 unsigned int tmp_ofs;
53
54 fputs(name, stdout);
55 putchar(0);
56 offset += name_len;
57
58 tmp_ofs = name_len + 110;
59 while (tmp_ofs & 3) {
60 putchar(0);
61 offset++;
62 tmp_ofs++;
63 }
64}
65
66static void push_hdr(const char *s)
67{
68 fputs(s, stdout);
69 offset += 110;
70}
71
72static void cpio_trailer(void)
73{
74 char s[256];
75 const char name[] = "TRAILER!!!";
76
77 sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX"
78 "%08X%08X%08X%08X%08X%08X%08X",
79 "070701",
80 0,
81 0,
82 (long) 0,
83 (long) 0,
84 1,
85 (long) 0,
86 0,
87 0,
88 0,
89 0,
90 0,
91 (unsigned)strlen(name)+1,
92 0);
93 push_hdr(s);
94 push_rest(name);
95
96 while (offset % 512) {
97 putchar(0);
98 offset++;
99 }
100}
101
102static int cpio_mkslink(const char *name, const char *target,
103 unsigned int mode, uid_t uid, gid_t gid)
104{
105 char s[256];
106
107 if (name[0] == '/')
108 name++;
109 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
110 "%08X%08X%08X%08X%08X%08X%08X",
111 "070701",
112 ino++,
113 S_IFLNK | mode,
114 (long) uid,
115 (long) gid,
116 1,
117 (long) default_mtime,
118 (unsigned)strlen(target)+1,
119 3,
120 1,
121 0,
122 0,
123 (unsigned)strlen(name) + 1,
124 0);
125 push_hdr(s);
126 push_string(name);
127 push_pad();
128 push_string(target);
129 push_pad();
130 return 0;
131}
132
133static int cpio_mkslink_line(const char *line)
134{
135 char name[PATH_MAX + 1];
136 char target[PATH_MAX + 1];
137 unsigned int mode;
138 int uid;
139 int gid;
140 int rc = -1;
141
142 if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, target, &mode, &uid, &gid)) {
143 fprintf(stderr, "Unrecognized dir format '%s'", line);
144 goto fail;
145 }
146 rc = cpio_mkslink(name, target, mode, uid, gid);
147 fail:
148 return rc;
149}
150
151static int cpio_mkgeneric(const char *name, unsigned int mode,
152 uid_t uid, gid_t gid)
153{
154 char s[256];
155
156 if (name[0] == '/')
157 name++;
158 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
159 "%08X%08X%08X%08X%08X%08X%08X",
160 "070701",
161 ino++,
162 mode,
163 (long) uid,
164 (long) gid,
165 2,
166 (long) default_mtime,
167 0,
168 3,
169 1,
170 0,
171 0,
172 (unsigned)strlen(name) + 1,
173 0);
174 push_hdr(s);
175 push_rest(name);
176 return 0;
177}
178
179enum generic_types {
180 GT_DIR,
181 GT_PIPE,
182 GT_SOCK
183};
184
185struct generic_type {
186 const char *type;
187 mode_t mode;
188};
189
190static struct generic_type generic_type_table[] = {
191 [GT_DIR] = {
192 .type = "dir",
193 .mode = S_IFDIR
194 },
195 [GT_PIPE] = {
196 .type = "pipe",
197 .mode = S_IFIFO
198 },
199 [GT_SOCK] = {
200 .type = "sock",
201 .mode = S_IFSOCK
202 }
203};
204
205static int cpio_mkgeneric_line(const char *line, enum generic_types gt)
206{
207 char name[PATH_MAX + 1];
208 unsigned int mode;
209 int uid;
210 int gid;
211 int rc = -1;
212
213 if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) {
214 fprintf(stderr, "Unrecognized %s format '%s'",
215 line, generic_type_table[gt].type);
216 goto fail;
217 }
218 mode |= generic_type_table[gt].mode;
219 rc = cpio_mkgeneric(name, mode, uid, gid);
220 fail:
221 return rc;
222}
223
224static int cpio_mkdir_line(const char *line)
225{
226 return cpio_mkgeneric_line(line, GT_DIR);
227}
228
229static int cpio_mkpipe_line(const char *line)
230{
231 return cpio_mkgeneric_line(line, GT_PIPE);
232}
233
234static int cpio_mksock_line(const char *line)
235{
236 return cpio_mkgeneric_line(line, GT_SOCK);
237}
238
239static int cpio_mknod(const char *name, unsigned int mode,
240 uid_t uid, gid_t gid, char dev_type,
241 unsigned int maj, unsigned int min)
242{
243 char s[256];
244
245 if (dev_type == 'b')
246 mode |= S_IFBLK;
247 else
248 mode |= S_IFCHR;
249
250 if (name[0] == '/')
251 name++;
252 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
253 "%08X%08X%08X%08X%08X%08X%08X",
254 "070701",
255 ino++,
256 mode,
257 (long) uid,
258 (long) gid,
259 1,
260 (long) default_mtime,
261 0,
262 3,
263 1,
264 maj,
265 min,
266 (unsigned)strlen(name) + 1,
267 0);
268 push_hdr(s);
269 push_rest(name);
270 return 0;
271}
272
273static int cpio_mknod_line(const char *line)
274{
275 char name[PATH_MAX + 1];
276 unsigned int mode;
277 int uid;
278 int gid;
279 char dev_type;
280 unsigned int maj;
281 unsigned int min;
282 int rc = -1;
283
284 if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u",
285 name, &mode, &uid, &gid, &dev_type, &maj, &min)) {
286 fprintf(stderr, "Unrecognized nod format '%s'", line);
287 goto fail;
288 }
289 rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min);
290 fail:
291 return rc;
292}
293
294static int cpio_mkfile(const char *name, const char *location,
295 unsigned int mode, uid_t uid, gid_t gid,
296 unsigned int nlinks)
297{
298 char s[256];
299 char *filebuf = NULL;
300 struct stat buf;
301 long size;
302 int file = -1;
303 int retval;
304 int rc = -1;
305 int namesize;
306 unsigned int i;
307
308 mode |= S_IFREG;
309
310 file = open (location, O_RDONLY);
311 if (file < 0) {
312 fprintf (stderr, "File %s could not be opened for reading\n", location);
313 goto error;
314 }
315
316 retval = fstat(file, &buf);
317 if (retval) {
318 fprintf(stderr, "File %s could not be stat()'ed\n", location);
319 goto error;
320 }
321
322 filebuf = malloc(buf.st_size);
323 if (!filebuf) {
324 fprintf (stderr, "out of memory\n");
325 goto error;
326 }
327
328 retval = read (file, filebuf, buf.st_size);
329 if (retval < 0) {
330 fprintf (stderr, "Can not read %s file\n", location);
331 goto error;
332 }
333
334 size = 0;
335 for (i = 1; i <= nlinks; i++) {
336
337 if (i == nlinks) size = buf.st_size;
338
339 if (name[0] == '/')
340 name++;
341 namesize = strlen(name) + 1;
342 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
343 "%08lX%08X%08X%08X%08X%08X%08X",
344 "070701",
345 ino,
346 mode,
347 (long) uid,
348 (long) gid,
349 nlinks,
350 (long) buf.st_mtime,
351 size,
352 3,
353 1,
354 0,
355 0,
356 namesize,
357 0);
358 push_hdr(s);
359 push_string(name);
360 push_pad();
361
362 if (size) {
363 if (fwrite(filebuf, size, 1, stdout) != 1) {
364 fprintf(stderr, "writing filebuf failed\n");
365 goto error;
366 }
367 offset += size;
368 push_pad();
369 }
370
371 name += namesize;
372 }
373 ino++;
374 rc = 0;
375
376error:
377 if (filebuf) free(filebuf);
378 if (file >= 0) close(file);
379 return rc;
380}
381
382static char *cpio_replace_env(char *new_location)
383{
384 char expanded[PATH_MAX + 1];
385 char *start, *end, *var;
386
387 while ((start = strstr(new_location, "${")) &&
388 (end = strchr(start + 2, '}'))) {
389 *start = *end = 0;
390 var = getenv(start + 2);
391 snprintf(expanded, sizeof expanded, "%s%s%s",
392 new_location, var ? var : "", end + 1);
393 strcpy(new_location, expanded);
394 }
395
396 return new_location;
397}
398
399static int cpio_mkfile_line(const char *line)
400{
401 char name[PATH_MAX + 1];
402 char *dname = NULL;
403 char location[PATH_MAX + 1];
404 unsigned int mode;
405 int uid;
406 int gid;
407 int nlinks = 1;
408 int end = 0, dname_len = 0;
409 int rc = -1;
410
411 if (5 > sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX)
412 "s %o %d %d %n",
413 name, location, &mode, &uid, &gid, &end)) {
414 fprintf(stderr, "Unrecognized file format '%s'", line);
415 goto fail;
416 }
417 if (end && isgraph(line[end])) {
418 int len;
419 int nend;
420
421 dname = malloc(strlen(line));
422 if (!dname) {
423 fprintf (stderr, "out of memory (%d)\n", dname_len);
424 goto fail;
425 }
426
427 dname_len = strlen(name) + 1;
428 memcpy(dname, name, dname_len);
429
430 do {
431 nend = 0;
432 if (sscanf(line + end, "%" str(PATH_MAX) "s %n",
433 name, &nend) < 1)
434 break;
435 len = strlen(name) + 1;
436 memcpy(dname + dname_len, name, len);
437 dname_len += len;
438 nlinks++;
439 end += nend;
440 } while (isgraph(line[end]));
441 } else {
442 dname = name;
443 }
444 rc = cpio_mkfile(dname, cpio_replace_env(location),
445 mode, uid, gid, nlinks);
446 fail:
447 if (dname_len) free(dname);
448 return rc;
449}
450
451static void usage(const char *prog)
452{
453 fprintf(stderr, "Usage:\n"
454 "\t%s [-t <timestamp>] <cpio_list>\n"
455 "\n"
456 "<cpio_list> is a file containing newline separated entries that\n"
457 "describe the files to be included in the initramfs archive:\n"
458 "\n"
459 "# a comment\n"
460 "file <name> <location> <mode> <uid> <gid> [<hard links>]\n"
461 "dir <name> <mode> <uid> <gid>\n"
462 "nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n"
463 "slink <name> <target> <mode> <uid> <gid>\n"
464 "pipe <name> <mode> <uid> <gid>\n"
465 "sock <name> <mode> <uid> <gid>\n"
466 "\n"
467 "<name> name of the file/dir/nod/etc in the archive\n"
468 "<location> location of the file in the current filesystem\n"
469 " expands shell variables quoted with ${}\n"
470 "<target> link target\n"
471 "<mode> mode/permissions of the file\n"
472 "<uid> user id (0=root)\n"
473 "<gid> group id (0=root)\n"
474 "<dev_type> device type (b=block, c=character)\n"
475 "<maj> major number of nod\n"
476 "<min> minor number of nod\n"
477 "<hard links> space separated list of other links to file\n"
478 "\n"
479 "example:\n"
480 "# A simple initramfs\n"
481 "dir /dev 0755 0 0\n"
482 "nod /dev/console 0600 0 0 c 5 1\n"
483 "dir /root 0700 0 0\n"
484 "dir /sbin 0755 0 0\n"
485 "file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n"
486 "\n"
487 "<timestamp> is time in seconds since Epoch that will be used\n"
488 "as mtime for symlinks, special files and directories. The default\n"
489 "is to use the current time for these entries.\n",
490 prog);
491}
492
493struct file_handler file_handler_table[] = {
494 {
495 .type = "file",
496 .handler = cpio_mkfile_line,
497 }, {
498 .type = "nod",
499 .handler = cpio_mknod_line,
500 }, {
501 .type = "dir",
502 .handler = cpio_mkdir_line,
503 }, {
504 .type = "slink",
505 .handler = cpio_mkslink_line,
506 }, {
507 .type = "pipe",
508 .handler = cpio_mkpipe_line,
509 }, {
510 .type = "sock",
511 .handler = cpio_mksock_line,
512 }, {
513 .type = NULL,
514 .handler = NULL,
515 }
516};
517
518#define LINE_SIZE (2 * PATH_MAX + 50)
519
520int main (int argc, char *argv[])
521{
522 FILE *cpio_list;
523 char line[LINE_SIZE];
524 char *args, *type;
525 int ec = 0;
526 int line_nr = 0;
527 const char *filename;
528
529 default_mtime = time(NULL);
530 while (1) {
531 int opt = getopt(argc, argv, "t:h");
532 char *invalid;
533
534 if (opt == -1)
535 break;
536 switch (opt) {
537 case 't':
538 default_mtime = strtol(optarg, &invalid, 10);
539 if (!*optarg || *invalid) {
540 fprintf(stderr, "Invalid timestamp: %s\n",
541 optarg);
542 usage(argv[0]);
543 exit(1);
544 }
545 break;
546 case 'h':
547 case '?':
548 usage(argv[0]);
549 exit(opt == 'h' ? 0 : 1);
550 }
551 }
552
553 if (argc - optind != 1) {
554 usage(argv[0]);
555 exit(1);
556 }
557 filename = argv[optind];
558 if (!strcmp(filename, "-"))
559 cpio_list = stdin;
560 else if (!(cpio_list = fopen(filename, "r"))) {
561 fprintf(stderr, "ERROR: unable to open '%s': %s\n\n",
562 filename, strerror(errno));
563 usage(argv[0]);
564 exit(1);
565 }
566
567 while (fgets(line, LINE_SIZE, cpio_list)) {
568 int type_idx;
569 size_t slen = strlen(line);
570
571 line_nr++;
572
573 if ('#' == *line) {
574
575 continue;
576 }
577
578 if (! (type = strtok(line, " \t"))) {
579 fprintf(stderr,
580 "ERROR: incorrect format, could not locate file type line %d: '%s'\n",
581 line_nr, line);
582 ec = -1;
583 break;
584 }
585
586 if ('\n' == *type) {
587
588 continue;
589 }
590
591 if (slen == strlen(type)) {
592
593 continue;
594 }
595
596 if (! (args = strtok(NULL, "\n"))) {
597 fprintf(stderr,
598 "ERROR: incorrect format, newline required line %d: '%s'\n",
599 line_nr, line);
600 ec = -1;
601 }
602
603 for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) {
604 int rc;
605 if (! strcmp(line, file_handler_table[type_idx].type)) {
606 if ((rc = file_handler_table[type_idx].handler(args))) {
607 ec = rc;
608 fprintf(stderr, " line %d\n", line_nr);
609 }
610 break;
611 }
612 }
613
614 if (NULL == file_handler_table[type_idx].type) {
615 fprintf(stderr, "unknown file type line %d: '%s'\n",
616 line_nr, line);
617 }
618 }
619 if (ec == 0)
620 cpio_trailer();
621
622 exit(ec);
623}
624
