lg-downloader: Tool for flashing LG devices' internal storage from download mode

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>

1 files changed, 404 insertions, 0 deletions

diff --git a/src/lg-downloader.c b/src/lg-downloader.c
new file mode 100644
index 0000000..5c3ecfc
--- /dev/null
+++ b/src/lg-downloader.c
@@ -0,0 +1,404 @@
+/*
+ * Copyright (C) 2016 Paul Kocialkowski <contact@paulk.fr>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#include "lg-downloader.h"
+#include "gpt.h"
+#include "download.h"
+#include "usb.h"
+
+static int usage_print(void)
+{
+	printf("Usage: lg-downloader [OPTIONS] [OPERATION]\n\n"
+		"Options:\n"
+		" -v                             verbose\n\n"
+		"Operations:\n"
+		" reboot                         reboot device\n"
+		" erase [partition] [filename]   erase a partition\n"
+		" flash [partition] [filename]   flash a file to partition\n"
+		" dump [partition] [filename]    dump a partition to file\n");
+}
+
+static int arguments_parse(struct context *context, int argc, char *argv[])
+{
+	int i;
+
+	if (context == NULL || argc < 2)
+		return -1;
+
+	for (i = 1; i < argc; i++) {
+		if (strcmp(argv[i], "reboot") == 0) {
+			if (context->operation)
+				return -1;
+
+			context->operation = 'r';
+		} else if (strcmp(argv[i], "erase") == 0) {
+			if (context->operation || argc <= (i + 1))
+				return -1;
+
+			context->operation = 'e';
+			context->partition = argv[++i];
+			context->filename = argv[++i];
+		} else if (strcmp(argv[i], "flash") == 0) {
+			if (context->operation || argc <= (i + 2))
+				return -1;
+
+			context->operation = 'f';
+			context->partition = argv[++i];
+			context->filename = argv[++i];
+		} else if (strcmp(argv[i], "dump") == 0) {
+			if (context->operation || argc <= (i + 2))
+				return -1;
+
+			context->operation = 'd';
+			context->partition = argv[++i];
+			context->filename = argv[++i];
+		} else if (strcmp(argv[i], "partitions") == 0) {
+			if (context->operation)
+				return -1;
+
+			context->operation = 'p';
+		} else if (strcmp(argv[i], "-v") == 0) {
+			context->verbose = 1;
+		} else {
+			return -1;
+		}
+	}
+
+	if (!context->operation)
+		return -1;
+
+	return 0;
+}
+
+int erase(struct context *context)
+{
+	int rc;
+
+	rc = gpt_partition_find(context);
+	if (rc < 0) {
+		fprintf(stderr, "Finding GPT partition failed\n");
+		return -1;
+	}
+
+	if (context->verbose)
+		printf("Erasing partition with address %d blocks and length %d bytes\n", context->address, context->length);
+
+	rc = download_erase(context, context->address, context->length);
+	if (rc < 0)
+		return -1;
+
+	return 0;
+}
+
+int flash(struct context *context)
+{
+	void *buffer = NULL;
+	unsigned int address;
+	unsigned int length;
+	unsigned int count;
+	unsigned int chunk;
+	unsigned char *p;
+	unsigned int i;
+	struct stat st;
+	int fd = -1;
+	int rc;
+
+	if (context == NULL || context->filename == NULL)
+		return -1;
+
+	rc = gpt_partition_find(context);
+	if (rc < 0) {
+		fprintf(stderr, "Finding GPT partition failed\n");
+		goto error;
+	}
+
+	rc = stat(context->filename, &st);
+	if (rc < 0) {
+		fprintf(stderr, "Stating file failed\n");
+		goto error;
+	}
+
+	length = st.st_size;
+
+	if (length > context->length) {
+		fprintf(stderr, "File size (%d bytes) is too big for partition (%d bytes)\n", length, context->length);
+		goto error;
+	}
+
+	fd = open(context->filename, O_RDONLY);
+	if (fd < 0) {
+		fprintf(stderr, "Opening file failed\n");
+		goto error;
+	}
+
+	if (context->verbose)
+		printf("Writing to partition with address %d blocks and length %d bytes\n", context->address, length);
+
+	buffer = calloc(1, GPT_BLOCK_SIZE);
+
+	rc = download_start_flash_write(context);
+	if (rc < 0)
+		goto error;
+
+	address = context->address;
+	count = 0;
+
+	rc = download_initialize_partition(context, address, GPT_BLOCK_SIZE);
+	if (rc < 0)
+		goto error;
+
+	while (count < length) {
+		chunk = (length - count) < GPT_BLOCK_SIZE ? (length - count) : GPT_BLOCK_SIZE;
+
+		/* Writes are always block-aligned: fill the rest with zeros */
+		if (chunk < GPT_BLOCK_SIZE)
+			memset(buffer, 0, GPT_BLOCK_SIZE);
+
+		p = (unsigned char *) buffer;
+		i = 0;
+
+		while (i < chunk) {
+			rc = read(fd, p, chunk - i);
+			if (rc <= 0)
+				goto error;
+
+			i += rc;
+			p += rc;
+		}
+
+		rc = download_write(context, buffer, address, GPT_BLOCK_SIZE);
+		if (rc < 0)
+			goto error;
+
+		count += chunk;
+		address++;
+	}
+
+	rc = 0;
+	goto complete;
+
+error:
+	rc = -1;
+
+complete:
+	if (buffer != NULL)
+		free(buffer);
+
+	if (fd >= 0)
+		close(fd);
+
+	return rc;
+}
+
+int dump(struct context *context)
+{
+	void *buffer = NULL;
+	unsigned int address;
+	unsigned int length;
+	unsigned int count;
+	unsigned int chunk;
+	unsigned char *p;
+	unsigned int c;
+	int fd = -1;
+	int rc;
+
+	if (context == NULL || context->filename == NULL)
+		return -1;
+
+	rc = gpt_partition_find(context);
+	if (rc < 0) {
+		fprintf(stderr, "Finding GPT partition failed\n");
+		goto error;
+	}
+
+	fd = open(context->filename, O_WRONLY | O_CREAT | O_TRUNC, 644);
+	if (fd < 0) {
+		fprintf(stderr, "Opening file failed\n");
+		goto error;
+	}
+
+	if (context->verbose)
+		printf("Dumping partition with address %d blocks and length %d bytes\n", context->address, context->length);
+
+	buffer = calloc(1, GPT_BLOCK_SIZE);
+
+	address = context->address;
+	length = context->length;
+	count = 0;
+
+	rc = download_ready_read(context, address, GPT_BLOCK_SIZE);
+	if (rc < 0)
+		goto error;
+
+	while (count < length) {
+		chunk = (length - count) < GPT_BLOCK_SIZE ? (length - count) : GPT_BLOCK_SIZE;
+
+		if (chunk != GPT_BLOCK_SIZE) {
+			rc = download_ready_read(context, address, chunk);
+			if (rc < 0)
+				goto error;
+		}
+
+		rc = download_read(context, buffer, chunk);
+		if (rc < 0)
+			goto error;
+
+		c = 0;
+		p = (unsigned char *) buffer;
+
+		while (c < chunk) {
+			rc = write(fd, p, chunk - c);
+			if (rc <= 0)
+				goto error;
+
+			c += rc;
+			p += rc;
+		}
+
+		count += chunk;
+		address++;
+	}
+
+	rc = 0;
+	goto complete;
+
+error:
+	rc = -1;
+
+complete:
+	if (buffer != NULL)
+		free(buffer);
+
+	if (fd >= 0)
+		close(fd);
+
+	return rc;
+}
+
+static int partitions(struct context *context)
+{
+	int rc;
+
+	rc = gpt_partitions_print(context);
+	if (rc < 0)
+		return -1;
+
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	struct context context = { 0 };
+	int rc;
+
+	rc = arguments_parse(&context, argc, argv);
+	if (rc < 0) {
+		usage_print();
+		goto error;
+	}
+
+	if (context.verbose)
+		printf("Finding and opening USB device\n");
+
+	rc = usb_open(&context);
+	if (rc < 0)
+		goto error;
+
+	if (context.verbose)
+		printf("Notifying download\n");
+
+	rc = download_notify_start_dl(&context);
+	if (rc < 0)
+		goto error;
+
+	switch (context.operation) {
+		case 'r':
+			printf("Rebooting device\n");
+
+			rc = download_reset(&context);
+			if (rc < 0) {
+				fprintf(stderr, "Rebooting device failed\n");
+				goto error;
+			}
+
+			break;
+		case 'e':
+			printf("Erasing partition %s\n", context.partition);
+
+			/* Give the user a chance to hit Ctrl+C */
+			sleep(1);
+
+			rc = erase(&context);
+			if (rc < 0) {
+				fprintf(stderr, "Erasing partition failed\n");
+				goto error;
+			}
+
+			break;
+		case 'f':
+			printf("Flashing %s to partition %s\n", context.filename, context.partition);
+
+			rc = flash(&context);
+			if (rc < 0) {
+				fprintf(stderr, "Flashing partition failed\n");
+				goto error;
+			}
+
+			break;
+		case 'd':
+			printf("Dumping partition %s to %s\n", context.partition, context.filename);
+
+			rc = dump(&context);
+			if (rc < 0) {
+				fprintf(stderr, "Dumping partition failed\n");
+				goto error;
+			}
+
+			break;
+		case 'p':
+			printf("Reading partitions table\n");
+
+			rc = partitions(&context);
+			if (rc < 0) {
+				fprintf(stderr, "Reading partitions table failed\n");
+				goto error;
+			}
+
+			break;
+		default:
+			goto error;
+	}
+
+	printf("Done!\n");
+
+	rc = 0;
+	goto complete;
+
+error:
+	rc = 1;
+
+complete:
+	usb_close(&context);
+
+	return rc;
+}