--- /dev/null
+/*
+ * (C) Copyright 2011 Free Electrons
+ * David Wagner <david.wagner@free-electrons.com>
+ *
+ * Inspired from envcrc.c:
+ * (C) Copyright 2001
+ * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
+ *
+ * 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;
+}
Code Review / kvmfornfv.git / blobdiff