[J-u-boot.git] / tools / mkenvimage.c

/*
 * (C) Copyright 2011 Free Electrons
 * David Wagner <[email protected]>
 *
 * Inspired from envcrc.c:
 * (C) Copyright 2001
 * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), [email protected]
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <libgen.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>

#include "compiler.h"
#include <u-boot/crc.h>
#include <version.h>

#define CRC_SIZE sizeof(uint32_t)

static void usage(const char *exec_name)
{
	fprintf(stderr, "%s [-h] [-r] [-b] [-p <byte>] -s <environment partition size> -o <output> <input file>\n"
	       "\n"
	       "This tool takes a key=value input file (same as would a `printenv' show) and generates the corresponding environment image, ready to be flashed.\n"
	       "\n"
	       "\tThe input file is in format:\n"
	       "\t\tkey1=value1\n"
	       "\t\tkey2=value2\n"
	       "\t\t...\n"
	       "\t-r : the environment has multiple copies in flash\n"
	       "\t-b : the target is big endian (default is little endian)\n"
	       "\t-p <byte> : fill the image with <byte> bytes instead of 0xff bytes\n"
	       "\t-V : print version information and exit\n"
	       "\n"
	       "If the input file is \"-\", data is read from standard input\n",
	       exec_name);
}

long int xstrtol(const char *s)
{
	long int tmp;

	errno = 0;
	tmp = strtol(s, NULL, 0);
	if (!errno)
		return tmp;

	if (errno == ERANGE)
		fprintf(stderr, "Bad integer format: %s\n",  s);
	else
		fprintf(stderr, "Error while parsing %s: %s\n", s,
				strerror(errno));

	exit(EXIT_FAILURE);
}

int main(int argc, char **argv)
{
	uint32_t crc, targetendian_crc;
	const char *txt_filename = NULL, *bin_filename = NULL;
	int txt_fd, bin_fd;
	unsigned char *dataptr, *envptr;
	unsigned char *filebuf = NULL;
	unsigned int filesize = 0, envsize = 0, datasize = 0;
	int bigendian = 0;
	int redundant = 0;
	unsigned char padbyte = 0xff;

	int option;
	int ret = EXIT_SUCCESS;

	struct stat txt_file_stat;

	int fp, ep;
	const char *prg;

	prg = basename(argv[0]);

	/* Turn off getopt()'s internal error message */
	opterr = 0;

	/* Parse the cmdline */
	while ((option = getopt(argc, argv, ":s:o:rbp:hV")) != -1) {
		switch (option) {
		case 's':
			datasize = xstrtol(optarg);
			break;
		case 'o':
			bin_filename = strdup(optarg);
			if (!bin_filename) {
				fprintf(stderr, "Can't strdup() the output filename\n");
				return EXIT_FAILURE;
			}
			break;
		case 'r':
			redundant = 1;
			break;
		case 'b':
			bigendian = 1;
			break;
		case 'p':
			padbyte = xstrtol(optarg);
			break;
		case 'h':
			usage(prg);
			return EXIT_SUCCESS;
		case 'V':
			printf("%s version %s\n", prg, PLAIN_VERSION);
			return EXIT_SUCCESS;
		case ':':
			fprintf(stderr, "Missing argument for option -%c\n",
				optopt);
			usage(prg);
			return EXIT_FAILURE;
		default:
			fprintf(stderr, "Wrong option -%c\n", optopt);
			usage(prg);
			return EXIT_FAILURE;
		}
	}

	/* Check datasize and allocate the data */
	if (datasize == 0) {
		fprintf(stderr, "Please specify the size of the environment partition.\n");
		usage(prg);
		return EXIT_FAILURE;
	}

	dataptr = malloc(datasize * sizeof(*dataptr));
	if (!dataptr) {
		fprintf(stderr, "Can't alloc %d bytes for dataptr.\n",
				datasize);
		return EXIT_FAILURE;
	}

	/*
	 * envptr points to the beginning of the actual environment (after the
	 * crc and possible `redundant' byte
	 */
	envsize = datasize - (CRC_SIZE + redundant);
	envptr = dataptr + CRC_SIZE + redundant;

	/* Pad the environment with the padding byte */
	memset(envptr, padbyte, envsize);

	/* Open the input file ... */
	if (optind >= argc || strcmp(argv[optind], "-") == 0) {
		int readbytes = 0;
		int readlen = sizeof(*envptr) * 4096;
		txt_fd = STDIN_FILENO;

		do {
			filebuf = realloc(filebuf, readlen);
			if (!filebuf) {
				fprintf(stderr, "Can't realloc memory for the input file buffer\n");
				return EXIT_FAILURE;
			}
			readbytes = read(txt_fd, filebuf + filesize, readlen);
			if (errno) {
				fprintf(stderr, "Error while reading stdin: %s\n",
						strerror(errno));
				return EXIT_FAILURE;
			}
			filesize += readbytes;
		} while (readbytes == readlen);

	} else {
		txt_filename = argv[optind];
		txt_fd = open(txt_filename, O_RDONLY);
		if (txt_fd == -1) {
			fprintf(stderr, "Can't open \"%s\": %s\n",
					txt_filename, strerror(errno));
			return EXIT_FAILURE;
		}
		/* ... and check it */
		ret = fstat(txt_fd, &txt_file_stat);
		if (ret == -1) {
			fprintf(stderr, "Can't stat() on \"%s\": %s\n",
					txt_filename, strerror(errno));
			return EXIT_FAILURE;
		}

		filesize = txt_file_stat.st_size;

		filebuf = mmap(NULL, sizeof(*envptr) * filesize, PROT_READ,
			       MAP_PRIVATE, txt_fd, 0);
		if (filebuf == MAP_FAILED) {
			fprintf(stderr, "mmap (%zu bytes) failed: %s\n",
					sizeof(*envptr) * filesize,
					strerror(errno));
			fprintf(stderr, "Falling back to read()\n");

			filebuf = malloc(sizeof(*envptr) * filesize);
			ret = read(txt_fd, filebuf, sizeof(*envptr) * filesize);
			if (ret != sizeof(*envptr) * filesize) {
				fprintf(stderr, "Can't read the whole input file (%zu bytes): %s\n",
					sizeof(*envptr) * filesize,
					strerror(errno));

				return EXIT_FAILURE;
			}
		}
		ret = close(txt_fd);
	}
	/* The +1 is for the additionnal ending \0. See below. */
	if (filesize + 1 > envsize) {
		fprintf(stderr, "The input file is larger than the environment partition size\n");
		return EXIT_FAILURE;
	}

	/* Replace newlines separating variables with \0 */
	for (fp = 0, ep = 0 ; fp < filesize ; fp++) {
		if (filebuf[fp] == '\n') {
			if (ep == 0) {
				/*
				 * Newlines at the beginning of the file ?
				 * Ignore them.
				 */
				continue;
			} else if (filebuf[fp-1] == '\\') {
				/*
				 * Embedded newline in a variable.
				 *
				 * The backslash was added to the envptr; rewind
				 * and replace it with a newline
				 */
				ep--;
				envptr[ep++] = '\n';
			} else {
				/* End of a variable */
				envptr[ep++] = '\0';
			}
		} else {
			envptr[ep++] = filebuf[fp];
		}
	}
	/*
	 * Make sure there is a final '\0'
	 * And do it again on the next byte to mark the end of the environment.
	 */
	if (envptr[ep-1] != '\0') {
		envptr[ep++] = '\0';
		/*
		 * The text file doesn't have an ending newline.  We need to
		 * check the env size again to make sure we have room for two \0
		 */
		if (ep >= envsize) {
			fprintf(stderr, "The environment file is too large for the target environment storage\n");
			return EXIT_FAILURE;
		}
		envptr[ep] = '\0';
	} else {
		envptr[ep] = '\0';
	}

	/* Computes the CRC and put it at the beginning of the data */
	crc = crc32(0, envptr, envsize);
	targetendian_crc = bigendian ? cpu_to_be32(crc) : cpu_to_le32(crc);

	memcpy(dataptr, &targetendian_crc, sizeof(targetendian_crc));
	if (redundant)
		dataptr[sizeof(targetendian_crc)] = 1;

	if (!bin_filename || strcmp(bin_filename, "-") == 0) {
		bin_fd = STDOUT_FILENO;
	} else {
		bin_fd = creat(bin_filename, S_IRUSR | S_IWUSR | S_IRGRP |
					     S_IWGRP);
		if (bin_fd == -1) {
			fprintf(stderr, "Can't open output file \"%s\": %s\n",
					bin_filename, strerror(errno));
			return EXIT_FAILURE;
		}
	}

	if (write(bin_fd, dataptr, sizeof(*dataptr) * datasize) !=
			sizeof(*dataptr) * datasize) {
		fprintf(stderr, "write() failed: %s\n", strerror(errno));
		return EXIT_FAILURE;
	}

	ret = close(bin_fd);

	return ret;
}
Commit	Line	Data
a6337e6f DW	1	/*
	2	* (C) Copyright 2011 Free Electrons
	3	* David Wagner <[email protected]>
	4	*
	5	* Inspired from envcrc.c:
	6	* (C) Copyright 2001
	7	* Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), [email protected]
	8	*
1a459660	9	* SPDX-License-Identifier: GPL-2.0+
a6337e6f DW	10	*/
	11
	12	#include <errno.h>
	13	#include <fcntl.h>
	14	#include <stdio.h>
d1acdae9	15	#include <stdlib.h>
a6337e6f DW	16	#include <stdint.h>
	17	#include <string.h>
	18	#include <unistd.h>
558cd995	19	#include <libgen.h>
a6337e6f DW	20	#include <sys/types.h>
a6337e6f DW	21	#include <sys/stat.h>
6ee39f80	22	#include <sys/mman.h>
a6337e6f	23
d1acdae9	24	#include "compiler.h"
a6337e6f	25	#include <u-boot/crc.h>
1895420b	26	#include <version.h>
a6337e6f DW	27
	28	#define CRC_SIZE sizeof(uint32_t)
	29
	30	static void usage(const char *exec_name)
	31	{
8a1b8fc7	32	fprintf(stderr, "%s [-h] [-r] [-b] [-p <byte>] -s <environment partition size> -o <output> <input file>\n"
a6337e6f	33	"\n"
8a1b8fc7	34	"This tool takes a key=value input file (same as would a `printenv' show) and generates the corresponding environment image, ready to be flashed.\n"
a6337e6f DW	35	"\n"
	36	"\tThe input file is in format:\n"
	37	"\t\tkey1=value1\n"
	38	"\t\tkey2=value2\n"
	39	"\t\t...\n"
	40	"\t-r : the environment has multiple copies in flash\n"
	41	"\t-b : the target is big endian (default is little endian)\n"
8a1b8fc7	42	"\t-p <byte> : fill the image with <byte> bytes instead of 0xff bytes\n"
1895420b	43	"\t-V : print version information and exit\n"
a6337e6f DW	44	"\n"
	45	"If the input file is \"-\", data is read from standard input\n",
	46	exec_name);
	47	}
	48
3d0f9bd0 DW	49	long int xstrtol(const char *s)
	50	{
	51	long int tmp;
	52
	53	errno = 0;
	54	tmp = strtol(s, NULL, 0);
	55	if (!errno)
	56	return tmp;
	57
	58	if (errno == ERANGE)
	59	fprintf(stderr, "Bad integer format: %s\n", s);
	60	else
	61	fprintf(stderr, "Error while parsing %s: %s\n", s,
	62	strerror(errno));
	63
	64	exit(EXIT_FAILURE);
	65	}
	66
a6337e6f DW	67	int main(int argc, char **argv)
	68	{
	69	uint32_t crc, targetendian_crc;
	70	const char txt_filename = NULL, bin_filename = NULL;
	71	int txt_fd, bin_fd;
	72	unsigned char dataptr, envptr;
	73	unsigned char *filebuf = NULL;
	74	unsigned int filesize = 0, envsize = 0, datasize = 0;
	75	int bigendian = 0;
	76	int redundant = 0;
	77	unsigned char padbyte = 0xff;
	78
	79	int option;
	80	int ret = EXIT_SUCCESS;
	81
	82	struct stat txt_file_stat;
	83
	84	int fp, ep;
af44f4b2 HK	85	const char *prg;
	86
	87	prg = basename(argv[0]);
a6337e6f	88
5e0c63e2 HK	89	/* Turn off getopt()'s internal error message */
	90	opterr = 0;
	91
a6337e6f	92	/* Parse the cmdline */
1895420b	93	while ((option = getopt(argc, argv, ":s:o:rbp:hV")) != -1) {
a6337e6f DW	94	switch (option) {
a6337e6f DW	95	case 's':
3d0f9bd0	96	datasize = xstrtol(optarg);
a6337e6f DW	97	break;
	98	case 'o':
	99	bin_filename = strdup(optarg);
	100	if (!bin_filename) {
8a1b8fc7	101	fprintf(stderr, "Can't strdup() the output filename\n");
a6337e6f DW	102	return EXIT_FAILURE;
	103	}
	104	break;
	105	case 'r':
	106	redundant = 1;
	107	break;
	108	case 'b':
	109	bigendian = 1;
	110	break;
	111	case 'p':
3d0f9bd0	112	padbyte = xstrtol(optarg);
a6337e6f DW	113	break;
a6337e6f DW	114	case 'h':
af44f4b2	115	usage(prg);
a6337e6f	116	return EXIT_SUCCESS;
1895420b HK	117	case 'V':
	118	printf("%s version %s\n", prg, PLAIN_VERSION);
	119	return EXIT_SUCCESS;
5e0c63e2 HK	120	case ':':
5e0c63e2 HK	121	fprintf(stderr, "Missing argument for option -%c\n",
72ebafbe	122	optopt);
e758a5c4	123	usage(prg);
5e0c63e2	124	return EXIT_FAILURE;
a6337e6f	125	default:
72ebafbe	126	fprintf(stderr, "Wrong option -%c\n", optopt);
af44f4b2	127	usage(prg);
a6337e6f DW	128	return EXIT_FAILURE;
	129	}
	130	}
	131
	132	/* Check datasize and allocate the data */
	133	if (datasize == 0) {
8a1b8fc7	134	fprintf(stderr, "Please specify the size of the environment partition.\n");
af44f4b2	135	usage(prg);
a6337e6f DW	136	return EXIT_FAILURE;
	137	}
	138
	139	dataptr = malloc(datasize * sizeof(*dataptr));
	140	if (!dataptr) {
8a1b8fc7 DW	141	fprintf(stderr, "Can't alloc %d bytes for dataptr.\n",
8a1b8fc7 DW	142	datasize);
a6337e6f DW	143	return EXIT_FAILURE;
	144	}
	145
	146	/*
	147	* envptr points to the beginning of the actual environment (after the
8a1b8fc7	148	* crc and possible `redundant' byte
a6337e6f DW	149	*/
	150	envsize = datasize - (CRC_SIZE + redundant);
	151	envptr = dataptr + CRC_SIZE + redundant;
	152
	153	/* Pad the environment with the padding byte */
	154	memset(envptr, padbyte, envsize);
	155
	156	/* Open the input file ... */
48995b5a	157	if (optind >= argc \|\| strcmp(argv[optind], "-") == 0) {
a6337e6f	158	int readbytes = 0;
48995b5a	159	int readlen = sizeof(envptr) 4096;
a6337e6f DW	160	txt_fd = STDIN_FILENO;
	161
	162	do {
	163	filebuf = realloc(filebuf, readlen);
3d0f9bd0 DW	164	if (!filebuf) {
	165	fprintf(stderr, "Can't realloc memory for the input file buffer\n");
	166	return EXIT_FAILURE;
	167	}
a6337e6f	168	readbytes = read(txt_fd, filebuf + filesize, readlen);
3d0f9bd0 DW	169	if (errno) {
	170	fprintf(stderr, "Error while reading stdin: %s\n",
	171	strerror(errno));
	172	return EXIT_FAILURE;
	173	}
a6337e6f DW	174	filesize += readbytes;
	175	} while (readbytes == readlen);
	176
	177	} else {
48995b5a	178	txt_filename = argv[optind];
a6337e6f DW	179	txt_fd = open(txt_filename, O_RDONLY);
	180	if (txt_fd == -1) {
	181	fprintf(stderr, "Can't open \"%s\": %s\n",
	182	txt_filename, strerror(errno));
	183	return EXIT_FAILURE;
	184	}
	185	/* ... and check it */
	186	ret = fstat(txt_fd, &txt_file_stat);
	187	if (ret == -1) {
8a1b8fc7 DW	188	fprintf(stderr, "Can't stat() on \"%s\": %s\n",
8a1b8fc7 DW	189	txt_filename, strerror(errno));
a6337e6f DW	190	return EXIT_FAILURE;
	191	}
	192
	193	filesize = txt_file_stat.st_size;
6ee39f80 DW	194
	195	filebuf = mmap(NULL, sizeof(envptr) filesize, PROT_READ,
	196	MAP_PRIVATE, txt_fd, 0);
	197	if (filebuf == MAP_FAILED) {
1ebff63f	198	fprintf(stderr, "mmap (%zu bytes) failed: %s\n",
6ee39f80 DW	199	sizeof(envptr) filesize,
	200	strerror(errno));
	201	fprintf(stderr, "Falling back to read()\n");
	202
	203	filebuf = malloc(sizeof(envptr) filesize);
	204	ret = read(txt_fd, filebuf, sizeof(envptr) filesize);
	205	if (ret != sizeof(envptr) filesize) {
1ebff63f	206	fprintf(stderr, "Can't read the whole input file (%zu bytes): %s\n",
6ee39f80 DW	207	sizeof(envptr) filesize,
	208	strerror(errno));
	209
	210	return EXIT_FAILURE;
	211	}
a6337e6f DW	212	}
	213	ret = close(txt_fd);
	214	}
8a1b8fc7 DW	215	/* The +1 is for the additionnal ending \0. See below. */
	216	if (filesize + 1 > envsize) {
	217	fprintf(stderr, "The input file is larger than the environment partition size\n");
a6337e6f DW	218	return EXIT_FAILURE;
	219	}
	220
	221	/* Replace newlines separating variables with \0 */
	222	for (fp = 0, ep = 0 ; fp < filesize ; fp++) {
	223	if (filebuf[fp] == '\n') {
dbee61db	224	if (ep == 0) {
a6337e6f	225	/*
dbee61db DW	226	* Newlines at the beginning of the file ?
dbee61db DW	227	* Ignore them.
a6337e6f DW	228	*/
	229	continue;
	230	} else if (filebuf[fp-1] == '\\') {
	231	/*
	232	* Embedded newline in a variable.
	233	*
dbee61db DW	234	* The backslash was added to the envptr; rewind
dbee61db DW	235	* and replace it with a newline
a6337e6f DW	236	*/
	237	ep--;
	238	envptr[ep++] = '\n';
	239	} else {
	240	/* End of a variable */
	241	envptr[ep++] = '\0';
	242	}
a6337e6f DW	243	} else {
	244	envptr[ep++] = filebuf[fp];
	245	}
	246	}
	247	/*
	248	* Make sure there is a final '\0'
	249	* And do it again on the next byte to mark the end of the environment.
	250	*/
	251	if (envptr[ep-1] != '\0') {
	252	envptr[ep++] = '\0';
	253	/*
	254	* The text file doesn't have an ending newline. We need to
	255	* check the env size again to make sure we have room for two \0
	256	*/
	257	if (ep >= envsize) {
8a1b8fc7	258	fprintf(stderr, "The environment file is too large for the target environment storage\n");
a6337e6f DW	259	return EXIT_FAILURE;
	260	}
	261	envptr[ep] = '\0';
	262	} else {
	263	envptr[ep] = '\0';
	264	}
	265
	266	/* Computes the CRC and put it at the beginning of the data */
	267	crc = crc32(0, envptr, envsize);
	268	targetendian_crc = bigendian ? cpu_to_be32(crc) : cpu_to_le32(crc);
	269
d8d26599 DW	270	memcpy(dataptr, &targetendian_crc, sizeof(targetendian_crc));
	271	if (redundant)
	272	dataptr[sizeof(targetendian_crc)] = 1;
a6337e6f	273
48995b5a DW	274	if (!bin_filename \|\| strcmp(bin_filename, "-") == 0) {
	275	bin_fd = STDOUT_FILENO;
	276	} else {
4f7136e7 MF	277	bin_fd = creat(bin_filename, S_IRUSR \| S_IWUSR \| S_IRGRP \|
4f7136e7 MF	278	S_IWGRP);
48995b5a DW	279	if (bin_fd == -1) {
	280	fprintf(stderr, "Can't open output file \"%s\": %s\n",
	281	bin_filename, strerror(errno));
	282	return EXIT_FAILURE;
	283	}
a6337e6f DW	284	}
	285
	286	if (write(bin_fd, dataptr, sizeof(dataptr) datasize) !=
	287	sizeof(dataptr) datasize) {
	288	fprintf(stderr, "write() failed: %s\n", strerror(errno));
	289	return EXIT_FAILURE;
	290	}
	291
	292	ret = close(bin_fd);
	293
	294	return ret;
	295	}