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1// SPDX-License-Identifier: GPL-2.0
2#include <stdio.h>
3#include <stdlib.h>
4#include <stdint.h>
5#include <stdbool.h>
6#include <sys/types.h>
7#include <sys/stat.h>
8#include <string.h>
9#include <unistd.h>
10#include <time.h>
11#include <fcntl.h>
12#include <errno.h>
13#include <ctype.h>
14#include <limits.h>
15
16/*
17 * Original work by Jeff Garzik
18 *
19 * External file lists, symlink, pipe and fifo support by Thayne Harbaugh
20 * Hard link support by Luciano Rocha
21 */
22
23#define xstr(s) #s
24#define str(s) xstr(s)
25#define MIN(a, b) ((a) < (b) ? (a) : (b))
26
27static unsigned int offset;
28static unsigned int ino = 721;
29static time_t default_mtime;
30static bool do_file_mtime;
31static bool do_csum = false;
32
33struct file_handler {
34 const char *type;
35 int (*handler)(const char *line);
36};
37
38static void push_string(const char *name)
39{
40 unsigned int name_len = strlen(name) + 1;
41
42 fputs(name, stdout);
43 putchar(0);
44 offset += name_len;
45}
46
47static void push_pad (void)
48{
49 while (offset & 3) {
50 putchar(0);
51 offset++;
52 }
53}
54
55static void push_rest(const char *name)
56{
57 unsigned int name_len = strlen(name) + 1;
58 unsigned int tmp_ofs;
59
60 fputs(name, stdout);
61 putchar(0);
62 offset += name_len;
63
64 tmp_ofs = name_len + 110;
65 while (tmp_ofs & 3) {
66 putchar(0);
67 offset++;
68 tmp_ofs++;
69 }
70}
71
72static void push_hdr(const char *s)
73{
74 fputs(s, stdout);
75 offset += 110;
76}
77
78static void cpio_trailer(void)
79{
80 char s[256];
81 const char name[] = "TRAILER!!!";
82
83 sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX"
84 "%08X%08X%08X%08X%08X%08X%08X",
85 do_csum ? "070702" : "070701", /* magic */
86 0, /* ino */
87 0, /* mode */
88 (long) 0, /* uid */
89 (long) 0, /* gid */
90 1, /* nlink */
91 (long) 0, /* mtime */
92 0, /* filesize */
93 0, /* major */
94 0, /* minor */
95 0, /* rmajor */
96 0, /* rminor */
97 (unsigned)strlen(name)+1, /* namesize */
98 0); /* chksum */
99 push_hdr(s);
100 push_rest(name);
101
102 while (offset % 512) {
103 putchar(0);
104 offset++;
105 }
106}
107
108static int cpio_mkslink(const char *name, const char *target,
109 unsigned int mode, uid_t uid, gid_t gid)
110{
111 char s[256];
112
113 if (name[0] == '/')
114 name++;
115 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
116 "%08X%08X%08X%08X%08X%08X%08X",
117 do_csum ? "070702" : "070701", /* magic */
118 ino++, /* ino */
119 S_IFLNK | mode, /* mode */
120 (long) uid, /* uid */
121 (long) gid, /* gid */
122 1, /* nlink */
123 (long) default_mtime, /* mtime */
124 (unsigned)strlen(target)+1, /* filesize */
125 3, /* major */
126 1, /* minor */
127 0, /* rmajor */
128 0, /* rminor */
129 (unsigned)strlen(name) + 1,/* namesize */
130 0); /* chksum */
131 push_hdr(s);
132 push_string(name);
133 push_pad();
134 push_string(target);
135 push_pad();
136 return 0;
137}
138
139static int cpio_mkslink_line(const char *line)
140{
141 char name[PATH_MAX + 1];
142 char target[PATH_MAX + 1];
143 unsigned int mode;
144 int uid;
145 int gid;
146 int rc = -1;
147
148 if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, target, &mode, &uid, &gid)) {
149 fprintf(stderr, "Unrecognized dir format '%s'", line);
150 goto fail;
151 }
152 rc = cpio_mkslink(name, target, mode, uid, gid);
153 fail:
154 return rc;
155}
156
157static int cpio_mkgeneric(const char *name, unsigned int mode,
158 uid_t uid, gid_t gid)
159{
160 char s[256];
161
162 if (name[0] == '/')
163 name++;
164 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
165 "%08X%08X%08X%08X%08X%08X%08X",
166 do_csum ? "070702" : "070701", /* magic */
167 ino++, /* ino */
168 mode, /* mode */
169 (long) uid, /* uid */
170 (long) gid, /* gid */
171 2, /* nlink */
172 (long) default_mtime, /* mtime */
173 0, /* filesize */
174 3, /* major */
175 1, /* minor */
176 0, /* rmajor */
177 0, /* rminor */
178 (unsigned)strlen(name) + 1,/* namesize */
179 0); /* chksum */
180 push_hdr(s);
181 push_rest(name);
182 return 0;
183}
184
185enum generic_types {
186 GT_DIR,
187 GT_PIPE,
188 GT_SOCK
189};
190
191struct generic_type {
192 const char *type;
193 mode_t mode;
194};
195
196static const struct generic_type generic_type_table[] = {
197 [GT_DIR] = {
198 .type = "dir",
199 .mode = S_IFDIR
200 },
201 [GT_PIPE] = {
202 .type = "pipe",
203 .mode = S_IFIFO
204 },
205 [GT_SOCK] = {
206 .type = "sock",
207 .mode = S_IFSOCK
208 }
209};
210
211static int cpio_mkgeneric_line(const char *line, enum generic_types gt)
212{
213 char name[PATH_MAX + 1];
214 unsigned int mode;
215 int uid;
216 int gid;
217 int rc = -1;
218
219 if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) {
220 fprintf(stderr, "Unrecognized %s format '%s'",
221 line, generic_type_table[gt].type);
222 goto fail;
223 }
224 mode |= generic_type_table[gt].mode;
225 rc = cpio_mkgeneric(name, mode, uid, gid);
226 fail:
227 return rc;
228}
229
230static int cpio_mkdir_line(const char *line)
231{
232 return cpio_mkgeneric_line(line, GT_DIR);
233}
234
235static int cpio_mkpipe_line(const char *line)
236{
237 return cpio_mkgeneric_line(line, GT_PIPE);
238}
239
240static int cpio_mksock_line(const char *line)
241{
242 return cpio_mkgeneric_line(line, GT_SOCK);
243}
244
245static int cpio_mknod(const char *name, unsigned int mode,
246 uid_t uid, gid_t gid, char dev_type,
247 unsigned int maj, unsigned int min)
248{
249 char s[256];
250
251 if (dev_type == 'b')
252 mode |= S_IFBLK;
253 else
254 mode |= S_IFCHR;
255
256 if (name[0] == '/')
257 name++;
258 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
259 "%08X%08X%08X%08X%08X%08X%08X",
260 do_csum ? "070702" : "070701", /* magic */
261 ino++, /* ino */
262 mode, /* mode */
263 (long) uid, /* uid */
264 (long) gid, /* gid */
265 1, /* nlink */
266 (long) default_mtime, /* mtime */
267 0, /* filesize */
268 3, /* major */
269 1, /* minor */
270 maj, /* rmajor */
271 min, /* rminor */
272 (unsigned)strlen(name) + 1,/* namesize */
273 0); /* chksum */
274 push_hdr(s);
275 push_rest(name);
276 return 0;
277}
278
279static int cpio_mknod_line(const char *line)
280{
281 char name[PATH_MAX + 1];
282 unsigned int mode;
283 int uid;
284 int gid;
285 char dev_type;
286 unsigned int maj;
287 unsigned int min;
288 int rc = -1;
289
290 if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u",
291 name, &mode, &uid, &gid, &dev_type, &maj, &min)) {
292 fprintf(stderr, "Unrecognized nod format '%s'", line);
293 goto fail;
294 }
295 rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min);
296 fail:
297 return rc;
298}
299
300static int cpio_mkfile_csum(int fd, unsigned long size, uint32_t *csum)
301{
302 while (size) {
303 unsigned char filebuf[65536];
304 ssize_t this_read;
305 size_t i, this_size = MIN(size, sizeof(filebuf));
306
307 this_read = read(fd, filebuf, this_size);
308 if (this_read <= 0 || this_read > this_size)
309 return -1;
310
311 for (i = 0; i < this_read; i++)
312 *csum += filebuf[i];
313
314 size -= this_read;
315 }
316 /* seek back to the start for data segment I/O */
317 if (lseek(fd, 0, SEEK_SET) < 0)
318 return -1;
319
320 return 0;
321}
322
323static int cpio_mkfile(const char *name, const char *location,
324 unsigned int mode, uid_t uid, gid_t gid,
325 unsigned int nlinks)
326{
327 char s[256];
328 struct stat buf;
329 unsigned long size;
330 int file;
331 int retval;
332 int rc = -1;
333 time_t mtime;
334 int namesize;
335 unsigned int i;
336 uint32_t csum = 0;
337
338 mode |= S_IFREG;
339
340 file = open (location, O_RDONLY);
341 if (file < 0) {
342 fprintf (stderr, "File %s could not be opened for reading\n", location);
343 goto error;
344 }
345
346 retval = fstat(file, &buf);
347 if (retval) {
348 fprintf(stderr, "File %s could not be stat()'ed\n", location);
349 goto error;
350 }
351
352 if (do_file_mtime) {
353 mtime = default_mtime;
354 } else {
355 mtime = buf.st_mtime;
356 if (mtime > 0xffffffff) {
357 fprintf(stderr, "%s: Timestamp exceeds maximum cpio timestamp, clipping.\n",
358 location);
359 mtime = 0xffffffff;
360 }
361
362 if (mtime < 0) {
363 fprintf(stderr, "%s: Timestamp negative, clipping.\n",
364 location);
365 mtime = 0;
366 }
367 }
368
369 if (buf.st_size > 0xffffffff) {
370 fprintf(stderr, "%s: Size exceeds maximum cpio file size\n",
371 location);
372 goto error;
373 }
374
375 if (do_csum && cpio_mkfile_csum(file, buf.st_size, &csum) < 0) {
376 fprintf(stderr, "Failed to checksum file %s\n", location);
377 goto error;
378 }
379
380 size = 0;
381 for (i = 1; i <= nlinks; i++) {
382 /* data goes on last link */
383 if (i == nlinks)
384 size = buf.st_size;
385
386 if (name[0] == '/')
387 name++;
388 namesize = strlen(name) + 1;
389 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
390 "%08lX%08X%08X%08X%08X%08X%08X",
391 do_csum ? "070702" : "070701", /* magic */
392 ino, /* ino */
393 mode, /* mode */
394 (long) uid, /* uid */
395 (long) gid, /* gid */
396 nlinks, /* nlink */
397 (long) mtime, /* mtime */
398 size, /* filesize */
399 3, /* major */
400 1, /* minor */
401 0, /* rmajor */
402 0, /* rminor */
403 namesize, /* namesize */
404 size ? csum : 0); /* chksum */
405 push_hdr(s);
406 push_string(name);
407 push_pad();
408
409 while (size) {
410 unsigned char filebuf[65536];
411 ssize_t this_read;
412 size_t this_size = MIN(size, sizeof(filebuf));
413
414 this_read = read(file, filebuf, this_size);
415 if (this_read <= 0 || this_read > this_size) {
416 fprintf(stderr, "Can not read %s file\n", location);
417 goto error;
418 }
419
420 if (fwrite(filebuf, this_read, 1, stdout) != 1) {
421 fprintf(stderr, "writing filebuf failed\n");
422 goto error;
423 }
424 offset += this_read;
425 size -= this_read;
426 }
427 push_pad();
428
429 name += namesize;
430 }
431 ino++;
432 rc = 0;
433
434error:
435 if (file >= 0)
436 close(file);
437 return rc;
438}
439
440static char *cpio_replace_env(char *new_location)
441{
442 char expanded[PATH_MAX + 1];
443 char *start, *end, *var;
444
445 while ((start = strstr(new_location, "${")) &&
446 (end = strchr(start + 2, '}'))) {
447 *start = *end = 0;
448 var = getenv(start + 2);
449 snprintf(expanded, sizeof expanded, "%s%s%s",
450 new_location, var ? var : "", end + 1);
451 strcpy(new_location, expanded);
452 }
453
454 return new_location;
455}
456
457static int cpio_mkfile_line(const char *line)
458{
459 char name[PATH_MAX + 1];
460 char *dname = NULL; /* malloc'ed buffer for hard links */
461 char location[PATH_MAX + 1];
462 unsigned int mode;
463 int uid;
464 int gid;
465 int nlinks = 1;
466 int end = 0, dname_len = 0;
467 int rc = -1;
468
469 if (5 > sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX)
470 "s %o %d %d %n",
471 name, location, &mode, &uid, &gid, &end)) {
472 fprintf(stderr, "Unrecognized file format '%s'", line);
473 goto fail;
474 }
475 if (end && isgraph(line[end])) {
476 int len;
477 int nend;
478
479 dname = malloc(strlen(line));
480 if (!dname) {
481 fprintf (stderr, "out of memory (%d)\n", dname_len);
482 goto fail;
483 }
484
485 dname_len = strlen(name) + 1;
486 memcpy(dname, name, dname_len);
487
488 do {
489 nend = 0;
490 if (sscanf(line + end, "%" str(PATH_MAX) "s %n",
491 name, &nend) < 1)
492 break;
493 len = strlen(name) + 1;
494 memcpy(dname + dname_len, name, len);
495 dname_len += len;
496 nlinks++;
497 end += nend;
498 } while (isgraph(line[end]));
499 } else {
500 dname = name;
501 }
502 rc = cpio_mkfile(dname, cpio_replace_env(location),
503 mode, uid, gid, nlinks);
504 fail:
505 if (dname_len) free(dname);
506 return rc;
507}
508
509static void usage(const char *prog)
510{
511 fprintf(stderr, "Usage:\n"
512 "\t%s [-t <timestamp>] [-c] <cpio_list>\n"
513 "\n"
514 "<cpio_list> is a file containing newline separated entries that\n"
515 "describe the files to be included in the initramfs archive:\n"
516 "\n"
517 "# a comment\n"
518 "file <name> <location> <mode> <uid> <gid> [<hard links>]\n"
519 "dir <name> <mode> <uid> <gid>\n"
520 "nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n"
521 "slink <name> <target> <mode> <uid> <gid>\n"
522 "pipe <name> <mode> <uid> <gid>\n"
523 "sock <name> <mode> <uid> <gid>\n"
524 "\n"
525 "<name> name of the file/dir/nod/etc in the archive\n"
526 "<location> location of the file in the current filesystem\n"
527 " expands shell variables quoted with ${}\n"
528 "<target> link target\n"
529 "<mode> mode/permissions of the file\n"
530 "<uid> user id (0=root)\n"
531 "<gid> group id (0=root)\n"
532 "<dev_type> device type (b=block, c=character)\n"
533 "<maj> major number of nod\n"
534 "<min> minor number of nod\n"
535 "<hard links> space separated list of other links to file\n"
536 "\n"
537 "example:\n"
538 "# A simple initramfs\n"
539 "dir /dev 0755 0 0\n"
540 "nod /dev/console 0600 0 0 c 5 1\n"
541 "dir /root 0700 0 0\n"
542 "dir /sbin 0755 0 0\n"
543 "file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n"
544 "\n"
545 "<timestamp> is time in seconds since Epoch that will be used\n"
546 "as mtime for symlinks, directories, regular and special files.\n"
547 "The default is to use the current time for all files, but\n"
548 "preserve modification time for regular files.\n"
549 "-c: calculate and store 32-bit checksums for file data.\n",
550 prog);
551}
552
553static const struct file_handler file_handler_table[] = {
554 {
555 .type = "file",
556 .handler = cpio_mkfile_line,
557 }, {
558 .type = "nod",
559 .handler = cpio_mknod_line,
560 }, {
561 .type = "dir",
562 .handler = cpio_mkdir_line,
563 }, {
564 .type = "slink",
565 .handler = cpio_mkslink_line,
566 }, {
567 .type = "pipe",
568 .handler = cpio_mkpipe_line,
569 }, {
570 .type = "sock",
571 .handler = cpio_mksock_line,
572 }, {
573 .type = NULL,
574 .handler = NULL,
575 }
576};
577
578#define LINE_SIZE (2 * PATH_MAX + 50)
579
580int main (int argc, char *argv[])
581{
582 FILE *cpio_list;
583 char line[LINE_SIZE];
584 char *args, *type;
585 int ec = 0;
586 int line_nr = 0;
587 const char *filename;
588
589 default_mtime = time(NULL);
590 while (1) {
591 int opt = getopt(argc, argv, "t:ch");
592 char *invalid;
593
594 if (opt == -1)
595 break;
596 switch (opt) {
597 case 't':
598 default_mtime = strtol(optarg, &invalid, 10);
599 if (!*optarg || *invalid) {
600 fprintf(stderr, "Invalid timestamp: %s\n",
601 optarg);
602 usage(argv[0]);
603 exit(1);
604 }
605 do_file_mtime = true;
606 break;
607 case 'c':
608 do_csum = true;
609 break;
610 case 'h':
611 case '?':
612 usage(argv[0]);
613 exit(opt == 'h' ? 0 : 1);
614 }
615 }
616
617 /*
618 * Timestamps after 2106-02-07 06:28:15 UTC have an ascii hex time_t
619 * representation that exceeds 8 chars and breaks the cpio header
620 * specification. Negative timestamps similarly exceed 8 chars.
621 */
622 if (default_mtime > 0xffffffff || default_mtime < 0) {
623 fprintf(stderr, "ERROR: Timestamp out of range for cpio format\n");
624 exit(1);
625 }
626
627 if (argc - optind != 1) {
628 usage(argv[0]);
629 exit(1);
630 }
631 filename = argv[optind];
632 if (!strcmp(filename, "-"))
633 cpio_list = stdin;
634 else if (!(cpio_list = fopen(filename, "r"))) {
635 fprintf(stderr, "ERROR: unable to open '%s': %s\n\n",
636 filename, strerror(errno));
637 usage(argv[0]);
638 exit(1);
639 }
640
641 while (fgets(line, LINE_SIZE, cpio_list)) {
642 int type_idx;
643 size_t slen = strlen(line);
644
645 line_nr++;
646
647 if ('#' == *line) {
648 /* comment - skip to next line */
649 continue;
650 }
651
652 if (! (type = strtok(line, " \t"))) {
653 fprintf(stderr,
654 "ERROR: incorrect format, could not locate file type line %d: '%s'\n",
655 line_nr, line);
656 ec = -1;
657 break;
658 }
659
660 if ('\n' == *type) {
661 /* a blank line */
662 continue;
663 }
664
665 if (slen == strlen(type)) {
666 /* must be an empty line */
667 continue;
668 }
669
670 if (! (args = strtok(NULL, "\n"))) {
671 fprintf(stderr,
672 "ERROR: incorrect format, newline required line %d: '%s'\n",
673 line_nr, line);
674 ec = -1;
675 }
676
677 for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) {
678 int rc;
679 if (! strcmp(line, file_handler_table[type_idx].type)) {
680 if ((rc = file_handler_table[type_idx].handler(args))) {
681 ec = rc;
682 fprintf(stderr, " line %d\n", line_nr);
683 }
684 break;
685 }
686 }
687
688 if (NULL == file_handler_table[type_idx].type) {
689 fprintf(stderr, "unknown file type line %d: '%s'\n",
690 line_nr, line);
691 }
692 }
693 if (ec == 0)
694 cpio_trailer();
695
696 exit(ec);
697}
1// SPDX-License-Identifier: GPL-2.0
2#include <stdio.h>
3#include <stdlib.h>
4#include <sys/types.h>
5#include <sys/stat.h>
6#include <string.h>
7#include <unistd.h>
8#include <time.h>
9#include <fcntl.h>
10#include <errno.h>
11#include <ctype.h>
12#include <limits.h>
13
14/*
15 * Original work by Jeff Garzik
16 *
17 * External file lists, symlink, pipe and fifo support by Thayne Harbaugh
18 * Hard link support by Luciano Rocha
19 */
20
21#define xstr(s) #s
22#define str(s) xstr(s)
23
24static unsigned int offset;
25static unsigned int ino = 721;
26static time_t default_mtime;
27
28struct file_handler {
29 const char *type;
30 int (*handler)(const char *line);
31};
32
33static void push_string(const char *name)
34{
35 unsigned int name_len = strlen(name) + 1;
36
37 fputs(name, stdout);
38 putchar(0);
39 offset += name_len;
40}
41
42static void push_pad (void)
43{
44 while (offset & 3) {
45 putchar(0);
46 offset++;
47 }
48}
49
50static void push_rest(const char *name)
51{
52 unsigned int name_len = strlen(name) + 1;
53 unsigned int tmp_ofs;
54
55 fputs(name, stdout);
56 putchar(0);
57 offset += name_len;
58
59 tmp_ofs = name_len + 110;
60 while (tmp_ofs & 3) {
61 putchar(0);
62 offset++;
63 tmp_ofs++;
64 }
65}
66
67static void push_hdr(const char *s)
68{
69 fputs(s, stdout);
70 offset += 110;
71}
72
73static void cpio_trailer(void)
74{
75 char s[256];
76 const char name[] = "TRAILER!!!";
77
78 sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX"
79 "%08X%08X%08X%08X%08X%08X%08X",
80 "070701", /* magic */
81 0, /* ino */
82 0, /* mode */
83 (long) 0, /* uid */
84 (long) 0, /* gid */
85 1, /* nlink */
86 (long) 0, /* mtime */
87 0, /* filesize */
88 0, /* major */
89 0, /* minor */
90 0, /* rmajor */
91 0, /* rminor */
92 (unsigned)strlen(name)+1, /* namesize */
93 0); /* chksum */
94 push_hdr(s);
95 push_rest(name);
96
97 while (offset % 512) {
98 putchar(0);
99 offset++;
100 }
101}
102
103static int cpio_mkslink(const char *name, const char *target,
104 unsigned int mode, uid_t uid, gid_t gid)
105{
106 char s[256];
107
108 if (name[0] == '/')
109 name++;
110 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
111 "%08X%08X%08X%08X%08X%08X%08X",
112 "070701", /* magic */
113 ino++, /* ino */
114 S_IFLNK | mode, /* mode */
115 (long) uid, /* uid */
116 (long) gid, /* gid */
117 1, /* nlink */
118 (long) default_mtime, /* mtime */
119 (unsigned)strlen(target)+1, /* filesize */
120 3, /* major */
121 1, /* minor */
122 0, /* rmajor */
123 0, /* rminor */
124 (unsigned)strlen(name) + 1,/* namesize */
125 0); /* chksum */
126 push_hdr(s);
127 push_string(name);
128 push_pad();
129 push_string(target);
130 push_pad();
131 return 0;
132}
133
134static int cpio_mkslink_line(const char *line)
135{
136 char name[PATH_MAX + 1];
137 char target[PATH_MAX + 1];
138 unsigned int mode;
139 int uid;
140 int gid;
141 int rc = -1;
142
143 if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, target, &mode, &uid, &gid)) {
144 fprintf(stderr, "Unrecognized dir format '%s'", line);
145 goto fail;
146 }
147 rc = cpio_mkslink(name, target, mode, uid, gid);
148 fail:
149 return rc;
150}
151
152static int cpio_mkgeneric(const char *name, unsigned int mode,
153 uid_t uid, gid_t gid)
154{
155 char s[256];
156
157 if (name[0] == '/')
158 name++;
159 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
160 "%08X%08X%08X%08X%08X%08X%08X",
161 "070701", /* magic */
162 ino++, /* ino */
163 mode, /* mode */
164 (long) uid, /* uid */
165 (long) gid, /* gid */
166 2, /* nlink */
167 (long) default_mtime, /* mtime */
168 0, /* filesize */
169 3, /* major */
170 1, /* minor */
171 0, /* rmajor */
172 0, /* rminor */
173 (unsigned)strlen(name) + 1,/* namesize */
174 0); /* chksum */
175 push_hdr(s);
176 push_rest(name);
177 return 0;
178}
179
180enum generic_types {
181 GT_DIR,
182 GT_PIPE,
183 GT_SOCK
184};
185
186struct generic_type {
187 const char *type;
188 mode_t mode;
189};
190
191static struct generic_type generic_type_table[] = {
192 [GT_DIR] = {
193 .type = "dir",
194 .mode = S_IFDIR
195 },
196 [GT_PIPE] = {
197 .type = "pipe",
198 .mode = S_IFIFO
199 },
200 [GT_SOCK] = {
201 .type = "sock",
202 .mode = S_IFSOCK
203 }
204};
205
206static int cpio_mkgeneric_line(const char *line, enum generic_types gt)
207{
208 char name[PATH_MAX + 1];
209 unsigned int mode;
210 int uid;
211 int gid;
212 int rc = -1;
213
214 if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) {
215 fprintf(stderr, "Unrecognized %s format '%s'",
216 line, generic_type_table[gt].type);
217 goto fail;
218 }
219 mode |= generic_type_table[gt].mode;
220 rc = cpio_mkgeneric(name, mode, uid, gid);
221 fail:
222 return rc;
223}
224
225static int cpio_mkdir_line(const char *line)
226{
227 return cpio_mkgeneric_line(line, GT_DIR);
228}
229
230static int cpio_mkpipe_line(const char *line)
231{
232 return cpio_mkgeneric_line(line, GT_PIPE);
233}
234
235static int cpio_mksock_line(const char *line)
236{
237 return cpio_mkgeneric_line(line, GT_SOCK);
238}
239
240static int cpio_mknod(const char *name, unsigned int mode,
241 uid_t uid, gid_t gid, char dev_type,
242 unsigned int maj, unsigned int min)
243{
244 char s[256];
245
246 if (dev_type == 'b')
247 mode |= S_IFBLK;
248 else
249 mode |= S_IFCHR;
250
251 if (name[0] == '/')
252 name++;
253 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
254 "%08X%08X%08X%08X%08X%08X%08X",
255 "070701", /* magic */
256 ino++, /* ino */
257 mode, /* mode */
258 (long) uid, /* uid */
259 (long) gid, /* gid */
260 1, /* nlink */
261 (long) default_mtime, /* mtime */
262 0, /* filesize */
263 3, /* major */
264 1, /* minor */
265 maj, /* rmajor */
266 min, /* rminor */
267 (unsigned)strlen(name) + 1,/* namesize */
268 0); /* chksum */
269 push_hdr(s);
270 push_rest(name);
271 return 0;
272}
273
274static int cpio_mknod_line(const char *line)
275{
276 char name[PATH_MAX + 1];
277 unsigned int mode;
278 int uid;
279 int gid;
280 char dev_type;
281 unsigned int maj;
282 unsigned int min;
283 int rc = -1;
284
285 if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u",
286 name, &mode, &uid, &gid, &dev_type, &maj, &min)) {
287 fprintf(stderr, "Unrecognized nod format '%s'", line);
288 goto fail;
289 }
290 rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min);
291 fail:
292 return rc;
293}
294
295static int cpio_mkfile(const char *name, const char *location,
296 unsigned int mode, uid_t uid, gid_t gid,
297 unsigned int nlinks)
298{
299 char s[256];
300 char *filebuf = NULL;
301 struct stat buf;
302 long size;
303 int file = -1;
304 int retval;
305 int rc = -1;
306 int namesize;
307 unsigned int i;
308
309 mode |= S_IFREG;
310
311 file = open (location, O_RDONLY);
312 if (file < 0) {
313 fprintf (stderr, "File %s could not be opened for reading\n", location);
314 goto error;
315 }
316
317 retval = fstat(file, &buf);
318 if (retval) {
319 fprintf(stderr, "File %s could not be stat()'ed\n", location);
320 goto error;
321 }
322
323 filebuf = malloc(buf.st_size);
324 if (!filebuf) {
325 fprintf (stderr, "out of memory\n");
326 goto error;
327 }
328
329 retval = read (file, filebuf, buf.st_size);
330 if (retval < 0) {
331 fprintf (stderr, "Can not read %s file\n", location);
332 goto error;
333 }
334
335 size = 0;
336 for (i = 1; i <= nlinks; i++) {
337 /* data goes on last link */
338 if (i == nlinks) size = buf.st_size;
339
340 if (name[0] == '/')
341 name++;
342 namesize = strlen(name) + 1;
343 sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
344 "%08lX%08X%08X%08X%08X%08X%08X",
345 "070701", /* magic */
346 ino, /* ino */
347 mode, /* mode */
348 (long) uid, /* uid */
349 (long) gid, /* gid */
350 nlinks, /* nlink */
351 (long) buf.st_mtime, /* mtime */
352 size, /* filesize */
353 3, /* major */
354 1, /* minor */
355 0, /* rmajor */
356 0, /* rminor */
357 namesize, /* namesize */
358 0); /* chksum */
359 push_hdr(s);
360 push_string(name);
361 push_pad();
362
363 if (size) {
364 if (fwrite(filebuf, size, 1, stdout) != 1) {
365 fprintf(stderr, "writing filebuf failed\n");
366 goto error;
367 }
368 offset += size;
369 push_pad();
370 }
371
372 name += namesize;
373 }
374 ino++;
375 rc = 0;
376
377error:
378 if (filebuf) free(filebuf);
379 if (file >= 0) close(file);
380 return rc;
381}
382
383static char *cpio_replace_env(char *new_location)
384{
385 char expanded[PATH_MAX + 1];
386 char *start, *end, *var;
387
388 while ((start = strstr(new_location, "${")) &&
389 (end = strchr(start + 2, '}'))) {
390 *start = *end = 0;
391 var = getenv(start + 2);
392 snprintf(expanded, sizeof expanded, "%s%s%s",
393 new_location, var ? var : "", end + 1);
394 strcpy(new_location, expanded);
395 }
396
397 return new_location;
398}
399
400static int cpio_mkfile_line(const char *line)
401{
402 char name[PATH_MAX + 1];
403 char *dname = NULL; /* malloc'ed buffer for hard links */
404 char location[PATH_MAX + 1];
405 unsigned int mode;
406 int uid;
407 int gid;
408 int nlinks = 1;
409 int end = 0, dname_len = 0;
410 int rc = -1;
411
412 if (5 > sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX)
413 "s %o %d %d %n",
414 name, location, &mode, &uid, &gid, &end)) {
415 fprintf(stderr, "Unrecognized file format '%s'", line);
416 goto fail;
417 }
418 if (end && isgraph(line[end])) {
419 int len;
420 int nend;
421
422 dname = malloc(strlen(line));
423 if (!dname) {
424 fprintf (stderr, "out of memory (%d)\n", dname_len);
425 goto fail;
426 }
427
428 dname_len = strlen(name) + 1;
429 memcpy(dname, name, dname_len);
430
431 do {
432 nend = 0;
433 if (sscanf(line + end, "%" str(PATH_MAX) "s %n",
434 name, &nend) < 1)
435 break;
436 len = strlen(name) + 1;
437 memcpy(dname + dname_len, name, len);
438 dname_len += len;
439 nlinks++;
440 end += nend;
441 } while (isgraph(line[end]));
442 } else {
443 dname = name;
444 }
445 rc = cpio_mkfile(dname, cpio_replace_env(location),
446 mode, uid, gid, nlinks);
447 fail:
448 if (dname_len) free(dname);
449 return rc;
450}
451
452static void usage(const char *prog)
453{
454 fprintf(stderr, "Usage:\n"
455 "\t%s [-t <timestamp>] <cpio_list>\n"
456 "\n"
457 "<cpio_list> is a file containing newline separated entries that\n"
458 "describe the files to be included in the initramfs archive:\n"
459 "\n"
460 "# a comment\n"
461 "file <name> <location> <mode> <uid> <gid> [<hard links>]\n"
462 "dir <name> <mode> <uid> <gid>\n"
463 "nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n"
464 "slink <name> <target> <mode> <uid> <gid>\n"
465 "pipe <name> <mode> <uid> <gid>\n"
466 "sock <name> <mode> <uid> <gid>\n"
467 "\n"
468 "<name> name of the file/dir/nod/etc in the archive\n"
469 "<location> location of the file in the current filesystem\n"
470 " expands shell variables quoted with ${}\n"
471 "<target> link target\n"
472 "<mode> mode/permissions of the file\n"
473 "<uid> user id (0=root)\n"
474 "<gid> group id (0=root)\n"
475 "<dev_type> device type (b=block, c=character)\n"
476 "<maj> major number of nod\n"
477 "<min> minor number of nod\n"
478 "<hard links> space separated list of other links to file\n"
479 "\n"
480 "example:\n"
481 "# A simple initramfs\n"
482 "dir /dev 0755 0 0\n"
483 "nod /dev/console 0600 0 0 c 5 1\n"
484 "dir /root 0700 0 0\n"
485 "dir /sbin 0755 0 0\n"
486 "file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n"
487 "\n"
488 "<timestamp> is time in seconds since Epoch that will be used\n"
489 "as mtime for symlinks, special files and directories. The default\n"
490 "is to use the current time for these entries.\n",
491 prog);
492}
493
494struct file_handler file_handler_table[] = {
495 {
496 .type = "file",
497 .handler = cpio_mkfile_line,
498 }, {
499 .type = "nod",
500 .handler = cpio_mknod_line,
501 }, {
502 .type = "dir",
503 .handler = cpio_mkdir_line,
504 }, {
505 .type = "slink",
506 .handler = cpio_mkslink_line,
507 }, {
508 .type = "pipe",
509 .handler = cpio_mkpipe_line,
510 }, {
511 .type = "sock",
512 .handler = cpio_mksock_line,
513 }, {
514 .type = NULL,
515 .handler = NULL,
516 }
517};
518
519#define LINE_SIZE (2 * PATH_MAX + 50)
520
521int main (int argc, char *argv[])
522{
523 FILE *cpio_list;
524 char line[LINE_SIZE];
525 char *args, *type;
526 int ec = 0;
527 int line_nr = 0;
528 const char *filename;
529
530 default_mtime = time(NULL);
531 while (1) {
532 int opt = getopt(argc, argv, "t:h");
533 char *invalid;
534
535 if (opt == -1)
536 break;
537 switch (opt) {
538 case 't':
539 default_mtime = strtol(optarg, &invalid, 10);
540 if (!*optarg || *invalid) {
541 fprintf(stderr, "Invalid timestamp: %s\n",
542 optarg);
543 usage(argv[0]);
544 exit(1);
545 }
546 break;
547 case 'h':
548 case '?':
549 usage(argv[0]);
550 exit(opt == 'h' ? 0 : 1);
551 }
552 }
553
554 if (argc - optind != 1) {
555 usage(argv[0]);
556 exit(1);
557 }
558 filename = argv[optind];
559 if (!strcmp(filename, "-"))
560 cpio_list = stdin;
561 else if (!(cpio_list = fopen(filename, "r"))) {
562 fprintf(stderr, "ERROR: unable to open '%s': %s\n\n",
563 filename, strerror(errno));
564 usage(argv[0]);
565 exit(1);
566 }
567
568 while (fgets(line, LINE_SIZE, cpio_list)) {
569 int type_idx;
570 size_t slen = strlen(line);
571
572 line_nr++;
573
574 if ('#' == *line) {
575 /* comment - skip to next line */
576 continue;
577 }
578
579 if (! (type = strtok(line, " \t"))) {
580 fprintf(stderr,
581 "ERROR: incorrect format, could not locate file type line %d: '%s'\n",
582 line_nr, line);
583 ec = -1;
584 break;
585 }
586
587 if ('\n' == *type) {
588 /* a blank line */
589 continue;
590 }
591
592 if (slen == strlen(type)) {
593 /* must be an empty line */
594 continue;
595 }
596
597 if (! (args = strtok(NULL, "\n"))) {
598 fprintf(stderr,
599 "ERROR: incorrect format, newline required line %d: '%s'\n",
600 line_nr, line);
601 ec = -1;
602 }
603
604 for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) {
605 int rc;
606 if (! strcmp(line, file_handler_table[type_idx].type)) {
607 if ((rc = file_handler_table[type_idx].handler(args))) {
608 ec = rc;
609 fprintf(stderr, " line %d\n", line_nr);
610 }
611 break;
612 }
613 }
614
615 if (NULL == file_handler_table[type_idx].type) {
616 fprintf(stderr, "unknown file type line %d: '%s'\n",
617 line_nr, line);
618 }
619 }
620 if (ec == 0)
621 cpio_trailer();
622
623 exit(ec);
624}