[package] Add unvram, a nvram manipulation tool suitable for brcm-2.4 and bcm47xx platforms

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15426 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 233 insertions, 0 deletions

diff --git a/package/unvram/src/cli.c b/package/unvram/src/cli.c
new file mode 100644
index 0000000000..953910cd68
--- /dev/null
+++ b/package/unvram/src/cli.c
@@ -0,0 +1,233 @@
+/*
+ * Command line interface for libnvram
+ *
+ * Copyright 2009, Jo-Philipp Wich <xm@subsignal.org>
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ *
+ * The libnvram code is based on Broadcom code for Linux 2.4.x .
+ *
+ */
+
+#include "nvram.h"
+
+
+static nvram_handle_t * nvram_open_rdonly(void)
+{
+	const char *file = nvram_find_staging();
+
+	if( file == NULL )
+		file = nvram_find_mtd();
+
+	if( file != NULL )
+		return nvram_open(file, NVRAM_RO);
+
+	return NULL;
+}
+
+static nvram_handle_t * nvram_open_staging(void)
+{
+	if( nvram_find_staging() != NULL || nvram_to_staging() == 0 )
+		return nvram_open(NVRAM_STAGING, NVRAM_RW);
+
+	return NULL;
+}
+
+static int do_show(nvram_handle_t *nvram)
+{
+	nvram_tuple_t *t;
+	int stat = 1;
+
+	if( (t = nvram_getall(nvram)) != NULL )
+	{
+		while( t )
+		{
+			printf("%s=%s\n", t->name, t->value);
+			t = t->next;
+		}
+
+		stat = 0;
+	}
+
+	return stat;
+}
+
+static int do_get(nvram_handle_t *nvram, const char *var)
+{
+	const char *val;
+	int stat = 1;
+
+	if( (val = nvram_get(nvram, var)) != NULL )
+	{
+		printf("%s\n", val);
+		stat = 0;
+	}
+
+	return stat;
+}
+
+static int do_unset(nvram_handle_t *nvram, const char *var)
+{
+	return nvram_unset(nvram, var);
+}
+
+static int do_set(nvram_handle_t *nvram, const char *pair)
+{
+	char *val = strstr(pair, "=");
+	char var[strlen(pair)];
+	int stat = 1;
+
+	if( val != NULL )
+	{
+		memset(var, 0, sizeof(var));
+		strncpy(var, pair, (int)(val-pair));
+		stat = nvram_set(nvram, var, (char *)(val + 1));
+	}
+
+	return stat;
+}
+
+static int do_info(nvram_handle_t *nvram)
+{
+	nvram_header_t *hdr = nvram_header(nvram);
+
+	/* CRC8 over the last 11 bytes of the header and data bytes */
+	uint8_t crc = hndcrc8((unsigned char *) &hdr[0] + NVRAM_CRC_START_POSITION,
+		hdr->len - NVRAM_CRC_START_POSITION, 0xff);
+
+	/* Show info */
+	printf("Magic:         0x%08X\n",   hdr->magic);
+	printf("Length:        0x%08X\n",   hdr->len);
+
+	printf("CRC8:          0x%02X (calculated: 0x%02X)\n",
+		hdr->crc_ver_init & 0xFF, crc);
+
+	printf("Version:       0x%02X\n",   (hdr->crc_ver_init >> 8) & 0xFF);
+	printf("SDRAM init:    0x%04X\n",   (hdr->crc_ver_init >> 16) & 0xFFFF);
+	printf("SDRAM config:  0x%04X\n",   hdr->config_refresh & 0xFFFF);
+	printf("SDRAM refresh: 0x%04X\n",   (hdr->config_refresh >> 16) & 0xFFFF);
+	printf("NCDL values:   0x%08X\n\n", hdr->config_ncdl);
+
+	printf("%i bytes used / %i bytes available (%.2f%%)\n",
+		hdr->len, NVRAM_SPACE - hdr->len,
+		(100.00 / (double)NVRAM_SPACE) * (double)hdr->len);
+
+	return 0;
+}
+
+
+int main( int argc, const char *argv[] )
+{
+	nvram_handle_t *nvram;
+	int commit = 0;
+	int write = 0;
+	int stat = 1;
+	int done = 0;
+	int i;
+
+	/* Ugly... iterate over arguments to see whether we can expect a write */
+	for( i = 1; i < argc; i++ )
+		if( ( !strcmp(argv[i], "set")   && ++i < argc ) ||
+			( !strcmp(argv[i], "unset") && ++i < argc ) ||
+			!strcmp(argv[i], "commit") )
+		{
+			write = 1;
+			break;
+		}
+
+
+	nvram = write ? nvram_open_staging() : nvram_open_rdonly();
+
+	if( nvram != NULL && argc > 1 )
+	{
+		for( i = 1; i < argc; i++ )
+		{
+			if( !strcmp(argv[i], "show") )
+			{
+				stat = do_show(nvram);
+				done++;
+			}
+			else if( !strcmp(argv[i], "info") )
+			{
+				stat = do_info(nvram);
+				done++;
+			}
+			else if( !strcmp(argv[i], "get") && ++i < argc )
+			{
+				stat = do_get(nvram, argv[i]);
+				done++;
+			}
+			else if( !strcmp(argv[i], "unset") && ++i < argc )
+			{
+				stat = do_unset(nvram, argv[i]);
+				done++;
+			}
+			else if( !strcmp(argv[i], "set") && ++i < argc )
+			{
+				stat = do_set(nvram, argv[i]);
+				done++;
+			}
+			else if( !strcmp(argv[i], "commit") )
+			{
+				commit = 1;
+				done++;
+			}
+			else
+			{
+				fprintf(stderr, "Unknown option '%s' !\n", argv[i]);
+				done = 0;
+				break;
+			}
+		}
+
+		if( write )
+			stat = nvram_commit(nvram);
+
+		nvram_close(nvram);
+
+		if( commit )
+			stat = staging_to_nvram();
+	}
+
+	if( !nvram )
+	{
+		fprintf(stderr,
+			"Could not open nvram! Possible reasons are:\n"
+			"	- No device found (/proc not mounted or no nvram present)\n"
+			"	- Insufficient permissions to open mtd device\n"
+			"	- Insufficient memory to complete operation\n"
+			"	- Memory mapping failed or not supported\n"
+		);
+
+		stat = 1;
+	}
+	else if( !done )
+	{
+		fprintf(stderr,
+			"Usage:\n"
+			"	nvram show\n"
+			"	nvram info\n"
+			"	nvram get variable\n"
+			"	nvram set variable=value [set ...]\n"
+			"	nvram unset variable [unset ...]\n"
+			"	nvram commit\n"
+		);
+
+		stat = 1;
+	}
+
+	return stat;
+}