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