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-rw-r--r--mkubootenv.c298
1 files changed, 196 insertions, 102 deletions
diff --git a/mkubootenv.c b/mkubootenv.c
index 156e12d..4294b76 100644
--- a/mkubootenv.c
+++ b/mkubootenv.c
@@ -57,6 +57,7 @@
#define TRAILER_SIZE 2
#define err(fmt, args...) fprintf(stderr, "%s: Error: " fmt, CMD_NAME, ##args)
+#define warn(fmt, args...) fprintf(stderr, "%s: Warning: " fmt, CMD_NAME, ##args)
#ifdef DEBUG
# define dbg(fmt, args...) fprintf(stdout, fmt, ##args)
#else
@@ -65,165 +66,258 @@
/* file "object" */
struct file {
- char *name;
+ const char *name;
int fd;
uint8_t *ptr;
- struct stat sbuf;
+ size_t size;
};
static void usage_and_exit(int status) __attribute__((noreturn));
-static void usage_and_exit(int status)
+static inline void uboot_env_init_file(struct file *f)
{
- printf("usage: mkenv [-t <type>] [-s <size>] <source file> <target image file>\n"
- " -s <size> set size of the target image file to <size> bytes. If <size> is\n"
- " bigger than the source file, the target image gets padded with null\n"
- " bytes. If <size> is smaller than the source file, an error is emitted.\n"
- " -r reverse operation: get source file from target image file\n");
- exit(status);
+ memset(f, 0, sizeof(struct file));
+ f->ptr = MAP_FAILED;
}
-int main(int argc, char **argv)
+static int uboot_env_prepare_source(struct file *s)
{
- int i;
- int status = EXIT_FAILURE;
- struct file s, t; /* source and target file */
- ssize_t img_size = -1;
- ssize_t min_img_size;
- bool reverse = false;
- uint8_t *p, *q;
- uint32_t *crc;
-
- if (argc < 2)
- usage_and_exit(EXIT_FAILURE);
-
- /* parse commandline options */
- for (i = 1; (i + 1 < argc) && (argv[i][0] == '-'); i++) {
- switch (argv[i][1]) {
- case 's':
- img_size = strtol(argv[++i], NULL, 10);
- break;
- case 'r':
- reverse = true;
- break;
- case 'h':
- status = EXIT_SUCCESS;
- /* fall through */
- default:
- usage_and_exit(status);
- break;
- }
- }
-
- /* we expect two filenames */
- if (i + 2 > argc)
- usage_and_exit(EXIT_FAILURE);
-
- s.name = argv[i];
- t.name = argv[++i];
+ struct stat sbuf;
- s.fd = open(s.name, O_RDONLY);
- if (s.fd < 0) {
- err("Can't open source file '%s': %s\n", s.name,
+ s->fd = open(s->name, O_RDONLY);
+ if (s->fd < 0) {
+ err("Can't open source file '%s': %s\n", s->name,
strerror(errno));
- exit(EXIT_FAILURE);
+ return EXIT_FAILURE;
}
- if (fstat(s.fd, &s.sbuf) < 0) {
- err("Can't stat source file '%s': %s\n", s.name,
+ if (fstat(s->fd, &sbuf) < 0) {
+ err("Can't stat source file '%s': %s\n", s->name,
strerror(errno));
- goto err_out_close_s;
+ close(s->fd);
+ return -1;
}
- s.ptr = mmap(NULL, s.sbuf.st_size, PROT_READ, MAP_SHARED, s.fd, 0);
- if (s.ptr == MAP_FAILED) {
- err("Can't mmap source image file '%s': %s\n", s.name,
+ s->ptr = mmap(NULL, sbuf.st_size, PROT_READ, MAP_SHARED, s->fd, 0);
+ if (s->ptr == MAP_FAILED) {
+ err("Can't mmap source image file '%s': %s\n", s->name,
strerror(errno));
- goto err_out_close_s;
+ close(s->fd);
+ return -1;
}
- /* TODO: Check source file format:
- * var=value\n
- */
+ s->size = sbuf.st_size;
- /*
- * check whether the size hasn't been set or whether the source file +
- * CRC + trailer fits into the specified size.
- */
- min_img_size = CRC32_SIZE + s.sbuf.st_size + TRAILER_SIZE;
- if (img_size < 0)
- img_size = min_img_size;
- else if (img_size < min_img_size) {
- err("Specified size (%zd) is too small for the source file to "
- "fit into. Must be at least %zd bytes.\n",
- img_size, min_img_size);
- goto err_out_munmap_s;
- }
+ return 0;
+}
- t.fd = open(t.name, O_RDWR|O_CREAT|O_TRUNC, 0666);
- if (t.fd < 0) {
- err("Can't open target image file '%s': %s\n", t.name,
+static int uboot_env_prepare_target(struct file *t)
+{
+ t->fd = open(t->name, O_RDWR|O_CREAT|O_TRUNC, 0666);
+ if (t->fd < 0) {
+ err("Can't open target image file '%s': %s\n", t->name,
strerror(errno));
- goto err_out_munmap_s;
+ return -1;
}
/*
* seek to the end of the target file to write a byte, so we have the
* whole target image size mapped for writing
*/
- if (lseek(t.fd, img_size - 1, SEEK_SET) < 0) {
- err("Can't seek in target image file '%s': %s\n", t.name,
+ if (lseek(t->fd, t->size - 1, SEEK_SET) < 0) {
+ err("Can't seek in target image file '%s': %s\n", t->name,
strerror(errno));
- goto err_out_close_t;
+ close(t->fd);
+ return -1;
}
- if (write(t.fd, "", 1) < 0) {
- err("Can't write to target image file '%s': %s\n", t.name,
+ if (write(t->fd, "", 1) < 0) {
+ err("Can't write to target image file '%s': %s\n", t->name,
strerror(errno));
- goto err_out_close_t;
+ close(t->fd);
+ return -1;
}
- t.ptr = mmap(NULL, img_size, PROT_READ|PROT_WRITE, MAP_SHARED, t.fd, 0);
- if (t.ptr == MAP_FAILED) {
- err("Can't mmap target image file '%s': %s\n", t.name,
+ t->ptr = mmap(NULL, t->size, PROT_READ|PROT_WRITE, MAP_SHARED, t->fd, 0);
+ if (t->ptr == MAP_FAILED) {
+ err("Can't mmap target image file '%s': %s\n", t->name,
strerror(errno));
- goto err_out_close_t;
+ close(t->fd);
+ return -1;
}
- dbg("source file: %s\n", s.name);
- dbg("target image file: %s\n", t.name);
- dbg("size: %zd\n", img_size);
+ return 0;
+}
+
+static void uboot_env_cleanup_file(struct file *f)
+{
+ if (f->ptr != MAP_FAILED)
+ munmap(f->ptr, f->size);
+ if (f->fd > 0)
+ close(f->fd);
+}
+
+static void uboot_env_to_img(struct file *s, struct file *t)
+{
+ uint8_t *p, *q, *end;
+ uint32_t *crc;
+
+ dbg("source file (env): %s\n", s->name);
+ dbg("target image file (bin): %s\n", t->name);
+ dbg("target size: %zd\n", t->size);
/* CRC32 placeholder, will be filled later */
dbg("writing crc dummy...\n");
- for (p = t.ptr; p < t.ptr + CRC32_SIZE; p++)
+ end = t->ptr + CRC32_SIZE;
+ for (p = t->ptr; p < end; p++)
*p = 0;
/* copy the source file, replacing \n by \0 */
dbg("writing data...\n");
- for (q = s.ptr; q < s.ptr + s.sbuf.st_size; q++, p++)
+ end = s->ptr + s->size;
+ for (q = s->ptr; q < end; q++, p++)
*p = (*q == '\n') ? '\0' : *q;
/* trailer */
dbg("writing trailer...\n");
- for (q = s.ptr + s.sbuf.st_size; q < s.ptr + img_size; q++)
+ end = s->ptr + t->size;
+ for (q = s->ptr + s->size; q < end; q++)
*p = 0;
/* now for the real CRC32 */
dbg("calculating crc...\n");
- crc = (uint32_t *) t.ptr;
- *crc = crc32(0, t.ptr + CRC32_SIZE, img_size - CRC32_SIZE);
+ crc = (uint32_t *) t->ptr;
+ *crc = crc32(0, t->ptr + CRC32_SIZE, t->size - CRC32_SIZE);
dbg("crc: %08x\n", *crc);
+}
+
+static void uboot_img_to_env(struct file *s, struct file *t)
+{
+ uint8_t *p, *q, *end;
+ uint32_t *crc;
+
+ dbg("source file (bin): %s\n", s->name);
+ dbg("target image file (env): %s\n", t->name);
+ dbg("target size: %zd\n", t->size);
+
+ /* TODO: check CRC */
+
+ p = t->ptr;
+ end = s->ptr + CRC32_SIZE + t->size;
+ for (q = s->ptr + CRC32_SIZE; q < end; p++, q++)
+ *p = (*q == '\0') ? '\n' : *q;
+}
+
+static void usage_and_exit(int status)
+{
+ printf("usage: mkenv [-t <type>] [-s <size>] <source file> <target file>\n"
+ " -s <size> set size of the target image file to <size> bytes. If <size> is\n"
+ " bigger than the source file, the target image gets padded with null\n"
+ " bytes. If <size> is smaller than the source file, an error is emitted.\n"
+ " -r reverse operation: get plaintext env file (target) from binary image\n"
+ " file (source)\n");
+ exit(status);
+}
+
+int main(int argc, char **argv)
+{
+ int i;
+ int status = EXIT_FAILURE;
+ ssize_t img_size = -1;
+ bool reverse = false;
+ struct file s, t; /* source and target file */
+
+ if (argc < 2)
+ usage_and_exit(EXIT_FAILURE);
+
+ /* parse commandline options */
+ for (i = 1; (i + 1 < argc) && (argv[i][0] == '-'); i++) {
+ switch (argv[i][1]) {
+ case 's':
+ img_size = strtol(argv[++i], NULL, 10);
+ if (img_size <= 0) {
+ err("Invalid target image size: %zd. Must be greater than 0.\n", img_size);
+ exit(EXIT_FAILURE);
+ }
+ break;
+ case 'r':
+ reverse = true;
+ break;
+ case 'h':
+ status = EXIT_SUCCESS;
+ /* fall through */
+ default:
+ usage_and_exit(status);
+ break;
+ }
+ }
+
+ /* we expect two filenames */
+ if (i + 2 > argc)
+ usage_and_exit(EXIT_FAILURE);
+
+ if (reverse && img_size >= 0)
+ warn("Image size specified in reverse mode will be ignored\n");
+
+ uboot_env_init_file(&s);
+ uboot_env_init_file(&t);
+ s.name = argv[i];
+ t.name = argv[i+1];
+
+ if (uboot_env_prepare_source(&s))
+ exit(EXIT_FAILURE);
+
+ if (!reverse) {
+ ssize_t min_img_size = CRC32_SIZE + s.size + TRAILER_SIZE;
+
+ /* TODO: Check source file format:
+ * var=value\n
+ */
+
+ /*
+ * check whether the size hasn't been set or whether the source file +
+ * CRC + trailer fits into the specified size.
+ */
+ if (img_size < 0)
+ img_size = min_img_size;
+ else if (img_size < min_img_size) {
+ err("Specified size (%zd) is too small for the source file to "
+ "fit into. Must be at least %zd bytes.\n",
+ img_size, min_img_size);
+ goto cleanup_source;
+ }
+
+ t.size = img_size;
+ if (uboot_env_prepare_target(&t))
+ goto cleanup_source;
+
+ uboot_env_to_img(&s, &t);
+ } else {
+ uint8_t *p;
+ uint8_t *end;
+ bool found_data_end = false;
+
+ /* get the length of the data part */
+ end = s.ptr + CRC32_SIZE + s.size;
+ for (p = s.ptr + CRC32_SIZE; (p < end - 1) && (!found_data_end); p++) {
+ /* two null bytes mark the end of the data section */
+ if (*p == '\0' && *(p + 1) == '\0')
+ found_data_end = true;
+ }
+
+ /* calculate the plain text file size */
+ t.size = p - (s.ptr + CRC32_SIZE);
+ if (uboot_env_prepare_target(&t))
+ goto cleanup_source;
+
+ uboot_img_to_env(&s, &t);
+ }
status = EXIT_SUCCESS;
- munmap(t.ptr, img_size);
-err_out_close_t:
- close(t.fd);
-err_out_munmap_s:
- munmap(s.ptr, s.sbuf.st_size);
-err_out_close_s:
- close(s.fd);
+ uboot_env_cleanup_file(&t);
+cleanup_source:
+ uboot_env_cleanup_file(&s);
exit(status);
}
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-11-25 00:58:03 +0000