contrib/userspace-nvram:

- fix checksum calculation
	- better handle invalid cli invokation
	- get rid of hard coded erase size
	- fix data type of crc8 function

contrib/userspace-nvram/cli.c

@@ -89,6 +89,7 @@ int main( int argc, const char *argv[] )
 	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 */
@@ -102,42 +103,39 @@ int main( int argc, const char *argv[] )
 		}
 
 
-	if( (nvram = write ? nvram_open_staging() : nvram_open_rdonly()) != NULL )
+	if( (nvram = write ? nvram_open_staging() : nvram_open_rdonly()) != NULL && argc > 1 )
 	{
 		for( i = 1; i < argc; i++ )
 		{
 			if( !strcmp(argv[i], "show") )
 			{
 				stat = do_show(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,
+				done = 0;
-					"Usage:\n"
+				break;
-					"	nvram show\n"
-					"	nvram get variable\n"
-					"	nvram set variable=value [set ...]\n"
-					"	nvram unset variable [unset ...]\n"
-					"	nvram commit\n"
-				);
-
-				return 1;
 			}
 		}
 
@@ -150,5 +148,31 @@ int main( int argc, const char *argv[] )
 			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 get variable\n"
+			"	nvram set variable=value [set ...]\n"
+			"	nvram unset variable [unset ...]\n"
+			"	nvram commit\n"
+		);
+
+		stat = 1;
+	}
+
 	return stat;
 }

contrib/userspace-nvram/crc.c

@@ -58,7 +58,7 @@ static const uint8_t crc8_table[256] = {
 };
 
 uint8_t hndcrc8 (
-	uint8_t * pdata,  /* pointer to array of data to process */
+	const char * pdata,  /* pointer to array of data to process */
 	uint32_t nbytes,  /* number of input data bytes to process */
 	uint8_t crc       /* either CRC8_INIT_VALUE or previous return value */
 ) {

contrib/userspace-nvram/nvram.c

@@ -14,9 +14,12 @@
 
 #include "nvram.h"
 
-#define TRACE() \
+#define TRACE(msg) \
-	printf("%s(%i) in %s()\n", \
+	printf("%s(%i) in %s(): %s\n", \
-		__FILE__, __LINE__, __FUNCTION__)
+		__FILE__, __LINE__, __FUNCTION__, msg ? msg : "?")
+
+size_t nvram_erase_size = 0;
+
 
 /*
  * -- Helper functions --
@@ -91,18 +94,15 @@ static nvram_tuple_t * _nvram_realloc( nvram_handle_t *h, nvram_tuple_t *t,
 /* (Re)initialize the hash table. */
 static int _nvram_rehash(nvram_handle_t *h)
 {
-	nvram_header_t *header = (nvram_header_t *) &h->mmap[NVRAM_SPACE];
+	nvram_header_t *header = (nvram_header_t *) &h->mmap[NVRAM_START(nvram_erase_size)];
-	char buf[] = "0xXXXXXXXX", *name, *value, *end, *eq;
+	char buf[] = "0xXXXXXXXX", *name, *value, *eq;
 
 	/* (Re)initialize hash table */
 	_nvram_free(h);
 
 	/* Parse and set "name=value\0 ... \0\0" */
 	name = (char *) &header[1];
-	/*
+
-	end = (char *) header + NVRAM_SPACE - 2;
-	end[0] = end[1] = '\0';
-	*/
 	for (; *name; name = value + strlen(value) + 1) {
 		if (!(eq = strchr(name, '=')))
 			break;
@@ -251,7 +251,7 @@ nvram_tuple_t * nvram_getall(nvram_handle_t *h)
 /* Regenerate NVRAM. */
 int nvram_commit(nvram_handle_t *h)
 {
-	nvram_header_t *header = (nvram_header_t *) &h->mmap[NVRAM_SPACE];
+	nvram_header_t *header = (nvram_header_t *) &h->mmap[NVRAM_START(nvram_erase_size)];
 	char *init, *config, *refresh, *ncdl;
 	char *ptr, *end;
 	int i;
@@ -280,6 +280,7 @@ int nvram_commit(nvram_handle_t *h)
 	/* Clear data area */
 	ptr = (char *) header + sizeof(nvram_header_t);
 	memset(ptr, 0xFF, NVRAM_SPACE - sizeof(nvram_header_t));
+	memset(&tmp, 0, sizeof(nvram_header_t));
 
 	/* Leave space for a double NUL at the end */
 	end = (char *) header + NVRAM_SPACE - 2;
@@ -328,15 +329,28 @@ nvram_handle_t * nvram_open(const char *file, int rdonly)
 	nvram_handle_t *h;
 	nvram_header_t *header;
 
+	/* If erase size or file are undefined then try to define them */
+	if( (nvram_erase_size == 0) || (file == NULL) )
+	{
+		/* Finding the mtd will set the appropriate erase size */
+		if( file == NULL )
+			file = nvram_find_mtd();
+		else
+			(void) nvram_find_mtd();
+
+		if( nvram_erase_size == 0 )
+			return NULL;
+	}
+
 	if( (fd = open(file, O_RDWR)) > -1 )
 	{
 		char *mmap_area = (char *) mmap(
-			NULL, 0x10000, PROT_READ | PROT_WRITE,
+			NULL, nvram_erase_size, PROT_READ | PROT_WRITE,
 			( rdonly == NVRAM_RO ) ? MAP_PRIVATE : MAP_SHARED, fd, 0);
 
 		if( mmap_area != MAP_FAILED )
 		{
-			memset(mmap_area, 0xFF, NVRAM_SPACE);
+			memset(mmap_area, 0xFF, NVRAM_START(nvram_erase_size));
 
 			if((h = (nvram_handle_t *) malloc(sizeof(nvram_handle_t))) != NULL)
 			{
@@ -344,9 +358,9 @@ nvram_handle_t * nvram_open(const char *file, int rdonly)
 
 				h->fd     = fd;
 				h->mmap   = mmap_area;
-				h->length = 0x10000;
+				h->length = nvram_erase_size;
 
-				header = (nvram_header_t *) &h->mmap[NVRAM_SPACE];
+				header = (nvram_header_t *) &h->mmap[NVRAM_START(nvram_erase_size)];
 
 				if( header->magic == NVRAM_MAGIC )
 				{
@@ -379,27 +393,30 @@ int nvram_close(nvram_handle_t *h)
 /* Determine NVRAM device node. */
 const char * nvram_find_mtd(void)
 {
-	//return "./samples/nvram.1";
-
 	FILE *fp;
-	int i;
+	int i, esz;
 	char dev[PATH_MAX];
-	char *path;
+	char *path = NULL;
 
-	// "/dev/mtdblock/" + ( 0 < x < 99 ) + "ro" + \0 = 19
+	// "/dev/mtdblock/" + ( 0 < x < 99 ) + \0 = 19
 	if( (path = (char *) malloc(19)) == NULL )
 		return NULL;
 
 	if ((fp = fopen("/proc/mtd", "r"))) {
 		while (fgets(dev, sizeof(dev), fp)) {
-			if (sscanf(dev, "mtd%d:", &i) && strstr(dev, "nvram")) {
+			if (strstr(dev, "nvram") && sscanf(dev, "mtd%d: %08x", &i, &esz)) {
-				snprintf(path, 19, "/dev/mtdblock/%d", i);
+				if( (path = (char *) malloc(19)) != NULL )
+				{
+					nvram_erase_size = esz;
+					snprintf(path, 19, "/dev/mtdblock/%d", i);
+					break;
+				}
 			}
 		}
 		fclose(fp);
 	}
 
-	return (const char *) path;
+	return path;
 }
 
 /* Check NVRAM staging file. */
@@ -419,12 +436,12 @@ const char * nvram_find_staging(void)
 int nvram_to_staging(void)
 {
 	int fdmtd, fdstg, stat;
-	const char *mtd;
+	const char *mtd = nvram_find_mtd();
-	char buf[0x10000];
+	char buf[nvram_erase_size];
 
 	stat = -1;
 
-	if( (mtd = nvram_find_mtd()) != NULL )
+	if( (mtd != NULL) && (nvram_erase_size > 0) )
 	{
 		if( (fdmtd = open(mtd, O_RDONLY)) > -1 )
 		{
@@ -451,12 +468,12 @@ int nvram_to_staging(void)
 int staging_to_nvram(void)
 {
 	int fdmtd, fdstg, stat;
-	const char *mtd;
+	const char *mtd = nvram_find_mtd();
-	char buf[0x10000];
+	char buf[nvram_erase_size];
 
 	stat = -1;
 
-	if( (mtd = nvram_find_mtd()) != NULL )
+	if( (mtd != NULL) && (nvram_erase_size > 0) )
 	{
 		if( (fdstg = open(NVRAM_STAGING, O_RDONLY)) > -1 )
 		{

contrib/userspace-nvram/nvram.h

@@ -82,7 +82,7 @@ int nvram_close(nvram_handle_t *h);
 #define nvram_safe_get(h, name) (nvram_get(h, name) ? : "")
 
 /* Computes a crc8 over the input data. */
-uint8_t hndcrc8 (uint8_t * pdata, uint32_t nbytes, uint8_t crc );
+uint8_t hndcrc8 (const char * pdata, uint32_t nbytes, uint8_t crc );
 
 /* Returns the crc value of the nvram. */
 uint8_t nvram_calc_crc(nvram_header_t * nvh);
@@ -113,12 +113,13 @@ const char * nvram_find_staging(void);
 #define NVRAM_SOFTWARE_VERSION	"1"
 
 /* NVRAM constants */
+#define NVRAM_SPACE			0x8000
+#define NVRAM_START(x)		x - NVRAM_SPACE
 #define NVRAM_MAGIC			0x48534C46	/* 'FLSH' */
 #define NVRAM_CLEAR_MAGIC	0x0
 #define NVRAM_INVALID_MAGIC	0xFFFFFFFF
 #define NVRAM_VERSION		1
 #define NVRAM_HEADER_SIZE	20
-#define NVRAM_SPACE			0x8000
 
 #define NVRAM_MAX_VALUE_LEN 255
 #define NVRAM_MAX_PARAM_LEN 64