[linux.git] / usr / gen_init_cpio.c

// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <limits.h>

/*
 * Original work by Jeff Garzik
 *
 * External file lists, symlink, pipe and fifo support by Thayne Harbaugh
 * Hard link support by Luciano Rocha
 */

#define xstr(s) #s
#define str(s) xstr(s)
#define MIN(a, b) ((a) < (b) ? (a) : (b))

static unsigned int offset;
static unsigned int ino = 721;
static time_t default_mtime;
static bool do_csum = false;

struct file_handler {
	const char *type;
	int (*handler)(const char *line);
};

static void push_string(const char *name)
{
	unsigned int name_len = strlen(name) + 1;

	fputs(name, stdout);
	putchar(0);
	offset += name_len;
}

static void push_pad (void)
{
	while (offset & 3) {
		putchar(0);
		offset++;
	}
}

static void push_rest(const char *name)
{
	unsigned int name_len = strlen(name) + 1;
	unsigned int tmp_ofs;

	fputs(name, stdout);
	putchar(0);
	offset += name_len;

	tmp_ofs = name_len + 110;
	while (tmp_ofs & 3) {
		putchar(0);
		offset++;
		tmp_ofs++;
	}
}

static void push_hdr(const char *s)
{
	fputs(s, stdout);
	offset += 110;
}

static void cpio_trailer(void)
{
	char s[256];
	const char name[] = "TRAILER!!!";

	sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX"
	       "%08X%08X%08X%08X%08X%08X%08X",
		do_csum ? "070702" : "070701", /* magic */
		0,			/* ino */
		0,			/* mode */
		(long) 0,		/* uid */
		(long) 0,		/* gid */
		1,			/* nlink */
		(long) 0,		/* mtime */
		0,			/* filesize */
		0,			/* major */
		0,			/* minor */
		0,			/* rmajor */
		0,			/* rminor */
		(unsigned)strlen(name)+1, /* namesize */
		0);			/* chksum */
	push_hdr(s);
	push_rest(name);

	while (offset % 512) {
		putchar(0);
		offset++;
	}
}

static int cpio_mkslink(const char *name, const char *target,
			 unsigned int mode, uid_t uid, gid_t gid)
{
	char s[256];

	if (name[0] == '/')
		name++;
	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
	       "%08X%08X%08X%08X%08X%08X%08X",
		do_csum ? "070702" : "070701", /* magic */
		ino++,			/* ino */
		S_IFLNK | mode,		/* mode */
		(long) uid,		/* uid */
		(long) gid,		/* gid */
		1,			/* nlink */
		(long) default_mtime,	/* mtime */
		(unsigned)strlen(target)+1, /* filesize */
		3,			/* major */
		1,			/* minor */
		0,			/* rmajor */
		0,			/* rminor */
		(unsigned)strlen(name) + 1,/* namesize */
		0);			/* chksum */
	push_hdr(s);
	push_string(name);
	push_pad();
	push_string(target);
	push_pad();
	return 0;
}

static int cpio_mkslink_line(const char *line)
{
	char name[PATH_MAX + 1];
	char target[PATH_MAX + 1];
	unsigned int mode;
	int uid;
	int gid;
	int rc = -1;

	if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, target, &mode, &uid, &gid)) {
		fprintf(stderr, "Unrecognized dir format '%s'", line);
		goto fail;
	}
	rc = cpio_mkslink(name, target, mode, uid, gid);
 fail:
	return rc;
}

static int cpio_mkgeneric(const char *name, unsigned int mode,
		       uid_t uid, gid_t gid)
{
	char s[256];

	if (name[0] == '/')
		name++;
	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
	       "%08X%08X%08X%08X%08X%08X%08X",
		do_csum ? "070702" : "070701", /* magic */
		ino++,			/* ino */
		mode,			/* mode */
		(long) uid,		/* uid */
		(long) gid,		/* gid */
		2,			/* nlink */
		(long) default_mtime,	/* mtime */
		0,			/* filesize */
		3,			/* major */
		1,			/* minor */
		0,			/* rmajor */
		0,			/* rminor */
		(unsigned)strlen(name) + 1,/* namesize */
		0);			/* chksum */
	push_hdr(s);
	push_rest(name);
	return 0;
}

enum generic_types {
	GT_DIR,
	GT_PIPE,
	GT_SOCK
};

struct generic_type {
	const char *type;
	mode_t mode;
};

static const struct generic_type generic_type_table[] = {
	[GT_DIR] = {
		.type = "dir",
		.mode = S_IFDIR
	},
	[GT_PIPE] = {
		.type = "pipe",
		.mode = S_IFIFO
	},
	[GT_SOCK] = {
		.type = "sock",
		.mode = S_IFSOCK
	}
};

static int cpio_mkgeneric_line(const char *line, enum generic_types gt)
{
	char name[PATH_MAX + 1];
	unsigned int mode;
	int uid;
	int gid;
	int rc = -1;

	if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) {
		fprintf(stderr, "Unrecognized %s format '%s'",
			line, generic_type_table[gt].type);
		goto fail;
	}
	mode |= generic_type_table[gt].mode;
	rc = cpio_mkgeneric(name, mode, uid, gid);
 fail:
	return rc;
}

static int cpio_mkdir_line(const char *line)
{
	return cpio_mkgeneric_line(line, GT_DIR);
}

static int cpio_mkpipe_line(const char *line)
{
	return cpio_mkgeneric_line(line, GT_PIPE);
}

static int cpio_mksock_line(const char *line)
{
	return cpio_mkgeneric_line(line, GT_SOCK);
}

static int cpio_mknod(const char *name, unsigned int mode,
		       uid_t uid, gid_t gid, char dev_type,
		       unsigned int maj, unsigned int min)
{
	char s[256];

	if (dev_type == 'b')
		mode |= S_IFBLK;
	else
		mode |= S_IFCHR;

	if (name[0] == '/')
		name++;
	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
	       "%08X%08X%08X%08X%08X%08X%08X",
		do_csum ? "070702" : "070701", /* magic */
		ino++,			/* ino */
		mode,			/* mode */
		(long) uid,		/* uid */
		(long) gid,		/* gid */
		1,			/* nlink */
		(long) default_mtime,	/* mtime */
		0,			/* filesize */
		3,			/* major */
		1,			/* minor */
		maj,			/* rmajor */
		min,			/* rminor */
		(unsigned)strlen(name) + 1,/* namesize */
		0);			/* chksum */
	push_hdr(s);
	push_rest(name);
	return 0;
}

static int cpio_mknod_line(const char *line)
{
	char name[PATH_MAX + 1];
	unsigned int mode;
	int uid;
	int gid;
	char dev_type;
	unsigned int maj;
	unsigned int min;
	int rc = -1;

	if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u",
			 name, &mode, &uid, &gid, &dev_type, &maj, &min)) {
		fprintf(stderr, "Unrecognized nod format '%s'", line);
		goto fail;
	}
	rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min);
 fail:
	return rc;
}

static int cpio_mkfile_csum(int fd, unsigned long size, uint32_t *csum)
{
	while (size) {
		unsigned char filebuf[65536];
		ssize_t this_read;
		size_t i, this_size = MIN(size, sizeof(filebuf));

		this_read = read(fd, filebuf, this_size);
		if (this_read <= 0 || this_read > this_size)
			return -1;

		for (i = 0; i < this_read; i++)
			*csum += filebuf[i];

		size -= this_read;
	}
	/* seek back to the start for data segment I/O */
	if (lseek(fd, 0, SEEK_SET) < 0)
		return -1;

	return 0;
}

static int cpio_mkfile(const char *name, const char *location,
			unsigned int mode, uid_t uid, gid_t gid,
			unsigned int nlinks)
{
	char s[256];
	struct stat buf;
	unsigned long size;
	int file;
	int retval;
	int rc = -1;
	int namesize;
	unsigned int i;
	uint32_t csum = 0;

	mode |= S_IFREG;

	file = open (location, O_RDONLY);
	if (file < 0) {
		fprintf (stderr, "File %s could not be opened for reading\n", location);
		goto error;
	}

	retval = fstat(file, &buf);
	if (retval) {
		fprintf(stderr, "File %s could not be stat()'ed\n", location);
		goto error;
	}

	if (buf.st_mtime > 0xffffffff) {
		fprintf(stderr, "%s: Timestamp exceeds maximum cpio timestamp, clipping.\n",
			location);
		buf.st_mtime = 0xffffffff;
	}

	if (buf.st_size > 0xffffffff) {
		fprintf(stderr, "%s: Size exceeds maximum cpio file size\n",
			location);
		goto error;
	}

	if (do_csum && cpio_mkfile_csum(file, buf.st_size, &csum) < 0) {
		fprintf(stderr, "Failed to checksum file %s\n", location);
		goto error;
	}

	size = 0;
	for (i = 1; i <= nlinks; i++) {
		/* data goes on last link */
		if (i == nlinks)
			size = buf.st_size;

		if (name[0] == '/')
			name++;
		namesize = strlen(name) + 1;
		sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
		       "%08lX%08X%08X%08X%08X%08X%08X",
			do_csum ? "070702" : "070701", /* magic */
			ino,			/* ino */
			mode,			/* mode */
			(long) uid,		/* uid */
			(long) gid,		/* gid */
			nlinks,			/* nlink */
			(long) buf.st_mtime,	/* mtime */
			size,			/* filesize */
			3,			/* major */
			1,			/* minor */
			0,			/* rmajor */
			0,			/* rminor */
			namesize,		/* namesize */
			size ? csum : 0);	/* chksum */
		push_hdr(s);
		push_string(name);
		push_pad();

		while (size) {
			unsigned char filebuf[65536];
			ssize_t this_read;
			size_t this_size = MIN(size, sizeof(filebuf));

			this_read = read(file, filebuf, this_size);
			if (this_read <= 0 || this_read > this_size) {
				fprintf(stderr, "Can not read %s file\n", location);
				goto error;
			}

			if (fwrite(filebuf, this_read, 1, stdout) != 1) {
				fprintf(stderr, "writing filebuf failed\n");
				goto error;
			}
			offset += this_read;
			size -= this_read;
		}
		push_pad();

		name += namesize;
	}
	ino++;
	rc = 0;

error:
	if (file >= 0)
		close(file);
	return rc;
}

static char *cpio_replace_env(char *new_location)
{
	char expanded[PATH_MAX + 1];
	char *start, *end, *var;

	while ((start = strstr(new_location, "${")) &&
	       (end = strchr(start + 2, '}'))) {
		*start = *end = 0;
		var = getenv(start + 2);
		snprintf(expanded, sizeof expanded, "%s%s%s",
			 new_location, var ? var : "", end + 1);
		strcpy(new_location, expanded);
	}

	return new_location;
}

static int cpio_mkfile_line(const char *line)
{
	char name[PATH_MAX + 1];
	char *dname = NULL; /* malloc'ed buffer for hard links */
	char location[PATH_MAX + 1];
	unsigned int mode;
	int uid;
	int gid;
	int nlinks = 1;
	int end = 0, dname_len = 0;
	int rc = -1;

	if (5 > sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX)
				"s %o %d %d %n",
				name, location, &mode, &uid, &gid, &end)) {
		fprintf(stderr, "Unrecognized file format '%s'", line);
		goto fail;
	}
	if (end && isgraph(line[end])) {
		int len;
		int nend;

		dname = malloc(strlen(line));
		if (!dname) {
			fprintf (stderr, "out of memory (%d)\n", dname_len);
			goto fail;
		}

		dname_len = strlen(name) + 1;
		memcpy(dname, name, dname_len);

		do {
			nend = 0;
			if (sscanf(line + end, "%" str(PATH_MAX) "s %n",
					name, &nend) < 1)
				break;
			len = strlen(name) + 1;
			memcpy(dname + dname_len, name, len);
			dname_len += len;
			nlinks++;
			end += nend;
		} while (isgraph(line[end]));
	} else {
		dname = name;
	}
	rc = cpio_mkfile(dname, cpio_replace_env(location),
	                 mode, uid, gid, nlinks);
 fail:
	if (dname_len) free(dname);
	return rc;
}

static void usage(const char *prog)
{
	fprintf(stderr, "Usage:\n"
		"\t%s [-t <timestamp>] [-c] <cpio_list>\n"
		"\n"
		"<cpio_list> is a file containing newline separated entries that\n"
		"describe the files to be included in the initramfs archive:\n"
		"\n"
		"# a comment\n"
		"file <name> <location> <mode> <uid> <gid> [<hard links>]\n"
		"dir <name> <mode> <uid> <gid>\n"
		"nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n"
		"slink <name> <target> <mode> <uid> <gid>\n"
		"pipe <name> <mode> <uid> <gid>\n"
		"sock <name> <mode> <uid> <gid>\n"
		"\n"
		"<name>       name of the file/dir/nod/etc in the archive\n"
		"<location>   location of the file in the current filesystem\n"
		"             expands shell variables quoted with ${}\n"
		"<target>     link target\n"
		"<mode>       mode/permissions of the file\n"
		"<uid>        user id (0=root)\n"
		"<gid>        group id (0=root)\n"
		"<dev_type>   device type (b=block, c=character)\n"
		"<maj>        major number of nod\n"
		"<min>        minor number of nod\n"
		"<hard links> space separated list of other links to file\n"
		"\n"
		"example:\n"
		"# A simple initramfs\n"
		"dir /dev 0755 0 0\n"
		"nod /dev/console 0600 0 0 c 5 1\n"
		"dir /root 0700 0 0\n"
		"dir /sbin 0755 0 0\n"
		"file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n"
		"\n"
		"<timestamp> is time in seconds since Epoch that will be used\n"
		"as mtime for symlinks, special files and directories. The default\n"
		"is to use the current time for these entries.\n"
		"-c: calculate and store 32-bit checksums for file data.\n",
		prog);
}

static const struct file_handler file_handler_table[] = {
	{
		.type    = "file",
		.handler = cpio_mkfile_line,
	}, {
		.type    = "nod",
		.handler = cpio_mknod_line,
	}, {
		.type    = "dir",
		.handler = cpio_mkdir_line,
	}, {
		.type    = "slink",
		.handler = cpio_mkslink_line,
	}, {
		.type    = "pipe",
		.handler = cpio_mkpipe_line,
	}, {
		.type    = "sock",
		.handler = cpio_mksock_line,
	}, {
		.type    = NULL,
		.handler = NULL,
	}
};

#define LINE_SIZE (2 * PATH_MAX + 50)

int main (int argc, char *argv[])
{
	FILE *cpio_list;
	char line[LINE_SIZE];
	char *args, *type;
	int ec = 0;
	int line_nr = 0;
	const char *filename;

	default_mtime = time(NULL);
	while (1) {
		int opt = getopt(argc, argv, "t:ch");
		char *invalid;

		if (opt == -1)
			break;
		switch (opt) {
		case 't':
			default_mtime = strtol(optarg, &invalid, 10);
			if (!*optarg || *invalid) {
				fprintf(stderr, "Invalid timestamp: %s\n",
						optarg);
				usage(argv[0]);
				exit(1);
			}
			break;
		case 'c':
			do_csum = true;
			break;
		case 'h':
		case '?':
			usage(argv[0]);
			exit(opt == 'h' ? 0 : 1);
		}
	}

	/*
	 * Timestamps after 2106-02-07 06:28:15 UTC have an ascii hex time_t
	 * representation that exceeds 8 chars and breaks the cpio header
	 * specification.
	 */
	if (default_mtime > 0xffffffff) {
		fprintf(stderr, "ERROR: Timestamp too large for cpio format\n");
		exit(1);
	}

	if (argc - optind != 1) {
		usage(argv[0]);
		exit(1);
	}
	filename = argv[optind];
	if (!strcmp(filename, "-"))
		cpio_list = stdin;
	else if (!(cpio_list = fopen(filename, "r"))) {
		fprintf(stderr, "ERROR: unable to open '%s': %s\n\n",
			filename, strerror(errno));
		usage(argv[0]);
		exit(1);
	}

	while (fgets(line, LINE_SIZE, cpio_list)) {
		int type_idx;
		size_t slen = strlen(line);

		line_nr++;

		if ('#' == *line) {
			/* comment - skip to next line */
			continue;
		}

		if (! (type = strtok(line, " \t"))) {
			fprintf(stderr,
				"ERROR: incorrect format, could not locate file type line %d: '%s'\n",
				line_nr, line);
			ec = -1;
			break;
		}

		if ('\n' == *type) {
			/* a blank line */
			continue;
		}

		if (slen == strlen(type)) {
			/* must be an empty line */
			continue;
		}

		if (! (args = strtok(NULL, "\n"))) {
			fprintf(stderr,
				"ERROR: incorrect format, newline required line %d: '%s'\n",
				line_nr, line);
			ec = -1;
		}

		for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) {
			int rc;
			if (! strcmp(line, file_handler_table[type_idx].type)) {
				if ((rc = file_handler_table[type_idx].handler(args))) {
					ec = rc;
					fprintf(stderr, " line %d\n", line_nr);
				}
				break;
			}
		}

		if (NULL == file_handler_table[type_idx].type) {
			fprintf(stderr, "unknown file type line %d: '%s'\n",
				line_nr, line);
		}
	}
	if (ec == 0)
		cpio_trailer();

	exit(ec);
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	#include <stdio.h>
1da177e4 LT	3	#include <stdlib.h>
ea804871 DD	4	#include <stdint.h>
ea804871 DD	5	#include <stdbool.h>
1da177e4 LT	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
24fa5096	20	* Hard link support by Luciano Rocha
1da177e4 LT	21	*/
	22
	23	#define xstr(s) #s
	24	#define str(s) xstr(s)
3a2699cf	25	#define MIN(a, b) ((a) < (b) ? (a) : (b))
1da177e4 LT	26
	27	static unsigned int offset;
	28	static unsigned int ino = 721;
a8b8017c	29	static time_t default_mtime;
ea804871	30	static bool do_csum = false;
1da177e4 LT	31
	32	struct file_handler {
	33	const char *type;
	34	int (handler)(const char line);
	35	};
	36
	37	static 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
	46	static void push_pad (void)
	47	{
	48	while (offset & 3) {
	49	putchar(0);
	50	offset++;
	51	}
	52	}
	53
	54	static 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
	71	static void push_hdr(const char *s)
	72	{
	73	fputs(s, stdout);
	74	offset += 110;
	75	}
	76
	77	static 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",
ea804871	84	do_csum ? "070702" : "070701", /* magic */
1da177e4 LT	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
	107	static int cpio_mkslink(const char name, const char target,
	108	unsigned int mode, uid_t uid, gid_t gid)
	109	{
	110	char s[256];
1da177e4	111
43f901fb TC	112	if (name[0] == '/')
43f901fb TC	113	name++;
1da177e4 LT	114	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
1da177e4 LT	115	"%08X%08X%08X%08X%08X%08X%08X",
ea804871	116	do_csum ? "070702" : "070701", /* magic */
1da177e4 LT	117	ino++, /* ino */
	118	S_IFLNK \| mode, /* mode */
	119	(long) uid, /* uid */
	120	(long) gid, /* gid */
	121	1, /* nlink */
a8b8017c	122	(long) default_mtime, /* mtime */
1da177e4 LT	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
	138	static 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
	156	static int cpio_mkgeneric(const char *name, unsigned int mode,
	157	uid_t uid, gid_t gid)
	158	{
	159	char s[256];
1da177e4	160
43f901fb TC	161	if (name[0] == '/')
43f901fb TC	162	name++;
1da177e4 LT	163	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
1da177e4 LT	164	"%08X%08X%08X%08X%08X%08X%08X",
ea804871	165	do_csum ? "070702" : "070701", /* magic */
1da177e4 LT	166	ino++, /* ino */
	167	mode, /* mode */
	168	(long) uid, /* uid */
	169	(long) gid, /* gid */
	170	2, /* nlink */
a8b8017c	171	(long) default_mtime, /* mtime */
1da177e4 LT	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
	184	enum generic_types {
	185	GT_DIR,
	186	GT_PIPE,
	187	GT_SOCK
	188	};
	189
	190	struct generic_type {
	191	const char *type;
	192	mode_t mode;
	193	};
	194
3510c5cf	195	static const struct generic_type generic_type_table[] = {
1da177e4 LT	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
	210	static 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
	229	static int cpio_mkdir_line(const char *line)
	230	{
	231	return cpio_mkgeneric_line(line, GT_DIR);
	232	}
	233
	234	static int cpio_mkpipe_line(const char *line)
	235	{
	236	return cpio_mkgeneric_line(line, GT_PIPE);
	237	}
	238
	239	static int cpio_mksock_line(const char *line)
	240	{
	241	return cpio_mkgeneric_line(line, GT_SOCK);
	242	}
	243
	244	static 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];
1da177e4 LT	249
	250	if (dev_type == 'b')
	251	mode \|= S_IFBLK;
	252	else
	253	mode \|= S_IFCHR;
	254
43f901fb TC	255	if (name[0] == '/')
43f901fb TC	256	name++;
1da177e4 LT	257	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
1da177e4 LT	258	"%08X%08X%08X%08X%08X%08X%08X",
ea804871	259	do_csum ? "070702" : "070701", /* magic */
1da177e4 LT	260	ino++, /* ino */
	261	mode, /* mode */
	262	(long) uid, /* uid */
	263	(long) gid, /* gid */
	264	1, /* nlink */
a8b8017c	265	(long) default_mtime, /* mtime */
1da177e4 LT	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
	278	static 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
ea804871 DD	299	static 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
1da177e4	322	static int cpio_mkfile(const char name, const char location,
24fa5096 LR	323	unsigned int mode, uid_t uid, gid_t gid,
24fa5096 LR	324	unsigned int nlinks)
1da177e4 LT	325	{
1da177e4 LT	326	char s[256];
1da177e4	327	struct stat buf;
3a2699cf	328	unsigned long size;
462cd772	329	int file;
1da177e4 LT	330	int retval;
1da177e4 LT	331	int rc = -1;
24fa5096	332	int namesize;
20f1de65	333	unsigned int i;
ea804871	334	uint32_t csum = 0;
1da177e4 LT	335
	336	mode \|= S_IFREG;
	337
1da177e4 LT	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
a3c888fc	344	retval = fstat(file, &buf);
96aebafa	345	if (retval) {
a3c888fc	346	fprintf(stderr, "File %s could not be stat()'ed\n", location);
96aebafa JJ	347	goto error;
	348	}
	349
4c9d410f NS	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
3a2699cf DD	356	if (buf.st_size > 0xffffffff) {
	357	fprintf(stderr, "%s: Size exceeds maximum cpio file size\n",
	358	location);
1da177e4 LT	359	goto error;
	360	}
	361
ea804871 DD	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
24fa5096 LR	367	size = 0;
	368	for (i = 1; i <= nlinks; i++) {
	369	/* data goes on last link */
3a2699cf DD	370	if (i == nlinks)
3a2699cf DD	371	size = buf.st_size;
24fa5096	372
43f901fb TC	373	if (name[0] == '/')
43f901fb TC	374	name++;
24fa5096 LR	375	namesize = strlen(name) + 1;
	376	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
	377	"%08lX%08X%08X%08X%08X%08X%08X",
ea804871	378	do_csum ? "070702" : "070701", /* magic */
24fa5096 LR	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 */
ea804871	391	size ? csum : 0); /* chksum */
24fa5096 LR	392	push_hdr(s);
	393	push_string(name);
	394	push_pad();
	395
3a2699cf DD	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) {
6d87fea4 MF	408	fprintf(stderr, "writing filebuf failed\n");
	409	goto error;
	410	}
3a2699cf DD	411	offset += this_read;
3a2699cf DD	412	size -= this_read;
24fa5096	413	}
3a2699cf	414	push_pad();
24fa5096 LR	415
	416	name += namesize;
	417	}
	418	ino++;
1da177e4	419	rc = 0;
3a2699cf	420
1da177e4	421	error:
3a2699cf DD	422	if (file >= 0)
3a2699cf DD	423	close(file);
1da177e4 LT	424	return rc;
	425	}
	426
3b1ec9fb SG	427	static char cpio_replace_env(char new_location)
3b1ec9fb SG	428	{
20f1de65	429	char expanded[PATH_MAX + 1];
c725ee54 MN	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);
20f1de65 KC	439	}
	440
	441	return new_location;
3b1ec9fb SG	442	}
3b1ec9fb SG	443
1da177e4 LT	444	static int cpio_mkfile_line(const char *line)
	445	{
	446	char name[PATH_MAX + 1];
24fa5096	447	char dname = NULL; / malloc'ed buffer for hard links */
1da177e4 LT	448	char location[PATH_MAX + 1];
	449	unsigned int mode;
	450	int uid;
	451	int gid;
24fa5096 LR	452	int nlinks = 1;
24fa5096 LR	453	int end = 0, dname_len = 0;
1da177e4 LT	454	int rc = -1;
1da177e4 LT	455
24fa5096 LR	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)) {
1da177e4 LT	459	fprintf(stderr, "Unrecognized file format '%s'", line);
	460	goto fail;
	461	}
24fa5096 LR	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	}
3b1ec9fb SG	489	rc = cpio_mkfile(dname, cpio_replace_env(location),
3b1ec9fb SG	490	mode, uid, gid, nlinks);
1da177e4	491	fail:
24fa5096	492	if (dname_len) free(dname);
1da177e4 LT	493	return rc;
	494	}
	495
5c725138	496	static void usage(const char *prog)
1da177e4 LT	497	{
1da177e4 LT	498	fprintf(stderr, "Usage:\n"
ea804871	499	"\t%s [-t <timestamp>] [-c] <cpio_list>\n"
1da177e4 LT	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"
24fa5096	505	"file <name> <location> <mode> <uid> <gid> [<hard links>]\n"
1da177e4 LT	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"
24fa5096 LR	512	"<name> name of the file/dir/nod/etc in the archive\n"
24fa5096 LR	513	"<location> location of the file in the current filesystem\n"
3b1ec9fb	514	" expands shell variables quoted with ${}\n"
24fa5096 LR	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"
1da177e4 LT	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"
a8b8017c MM	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"
ea804871 DD	534	"is to use the current time for these entries.\n"
ea804871 DD	535	"-c: calculate and store 32-bit checksums for file data.\n",
1da177e4 LT	536	prog);
	537	}
	538
3510c5cf	539	static const struct file_handler file_handler_table[] = {
1da177e4 LT	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
	566	int 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;
a8b8017c MM	573	const char *filename;
	574
	575	default_mtime = time(NULL);
	576	while (1) {
ea804871	577	int opt = getopt(argc, argv, "t:ch");
a8b8017c MM	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;
ea804871 DD	592	case 'c':
	593	do_csum = true;
	594	break;
a8b8017c MM	595	case 'h':
	596	case '?':
	597	usage(argv[0]);
	598	exit(opt == 'h' ? 0 : 1);
	599	}
	600	}
1da177e4	601
4c9d410f NS	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
a8b8017c	612	if (argc - optind != 1) {
1da177e4 LT	613	usage(argv[0]);
	614	exit(1);
	615	}
a8b8017c MM	616	filename = argv[optind];
a8b8017c MM	617	if (!strcmp(filename, "-"))
f2434ec1	618	cpio_list = stdin;
a8b8017c	619	else if (!(cpio_list = fopen(filename, "r"))) {
1da177e4	620	fprintf(stderr, "ERROR: unable to open '%s': %s\n\n",
a8b8017c	621	filename, strerror(errno));
1da177e4 LT	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;
aa1e816f	642	break;
1da177e4 LT	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	}
aa1e816f JJ	678	if (ec == 0)
aa1e816f JJ	679	cpio_trailer();
1da177e4 LT	680
	681	exit(ec);
	682	}