[PATCH] Initial namedev parsing of config files

.permission parsing works, .config needs more work.

1 files changed, 345 insertions, 0 deletions

diff --git a/namedev.c b/namedev.c
new file mode 100644
index 0000000000..ee122cf075
--- /dev/null
+++ b/namedev.c
@@ -0,0 +1,345 @@
+/*
+ * namedev.c
+ *
+ * Userspace devfs
+ *
+ * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
+ *
+ *
+ *	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 version 2 of the License.
+ * 
+ *	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.,
+ *	675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "list.h"
+#include "udev.h"
+#include "udev_version.h"
+#include "namedev.h"
+
+#define TYPE_LABEL	"LABEL"
+#define TYPE_NUMBER	"NUMBER"
+#define TYPE_TOPOLOGY	"TOPOLOGY"
+#define TYPE_REPLACE	"REPLACE"
+
+enum config_type {
+	KERNEL_NAME	= 0,	/* must be 0 to let memset() default to this value */
+	LABEL		= 1,
+	NUMBER		= 2,
+	TOPOLOGY	= 3,
+	REPLACE		= 4,
+};
+
+#define BUS_SIZE	30
+#define FILE_SIZE	50
+#define VALUE_SIZE	100
+#define ID_SIZE		50
+#define PLACE_SIZE	50
+#define NAME_SIZE	100
+#define OWNER_SIZE	30
+#define GROUP_SIZE	30
+
+
+struct config_device {
+	struct list_head node;
+
+	enum config_type type;
+
+	char bus[BUS_SIZE];
+	char sysfs_file[FILE_SIZE];
+	char sysfs_value[VALUE_SIZE];
+	char id[ID_SIZE];
+	char place[PLACE_SIZE];
+	char kernel_name[NAME_SIZE];
+	
+	/* what to set the device to */
+	int mode;
+	char name[NAME_SIZE];
+	char owner[OWNER_SIZE];
+	char group[GROUP_SIZE];
+};
+
+
+static LIST_HEAD(config_device_list);
+
+#define copy_var(a, b, var)		\
+	if (b->var)			\
+		b->var = a->var;
+
+#define copy_string(a, b, var)		\
+	if (strlen(b->var))		\
+		strcpy(b->var, a->var);
+
+static int add_dev(struct config_device *new_dev)
+{
+	struct list_head *tmp;
+	struct config_device *tmp_dev;
+
+	/* loop through the whole list of devices to see if we already have
+	 * this one... */
+	list_for_each(tmp, &config_device_list) {
+		struct config_device *dev = list_entry(tmp, struct config_device, node);
+		if (strcmp(dev->name, new_dev->name) == 0) {
+			/* the same, copy the new info into this structure */
+			copy_var(new_dev, dev, type);
+			copy_var(new_dev, dev, mode);
+			copy_string(new_dev, dev, bus);
+			copy_string(new_dev, dev, sysfs_file);
+			copy_string(new_dev, dev, sysfs_value);
+			copy_string(new_dev, dev, id);
+			copy_string(new_dev, dev, place);
+			copy_string(new_dev, dev, kernel_name);
+			copy_string(new_dev, dev, owner);
+			copy_string(new_dev, dev, group);
+			return 0;
+		}
+	}
+
+	/* not found, lets create a new structure, and add it to the list */
+	tmp_dev = malloc(sizeof(*tmp_dev));
+	if (!tmp_dev)
+		return -ENOMEM;
+	memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
+	list_add(&tmp_dev->node, &config_device_list);
+	return 0;
+}
+
+static int get_value(const char *left, char **orig_string, char **ret_string)
+{
+	char *temp;
+	char *string = *orig_string;
+
+	/* eat any whitespace */
+	while (isspace(*string))
+		++string;
+
+	/* split based on '=' */
+	temp = strsep(&string, "=");
+	if (strcasecmp(temp, left) == 0) {
+		/* got it, now strip off the '"' */
+		while (isspace(*string))
+			++string;
+		if (*string == '"')
+			++string;
+		temp = strsep(&string, "\"");
+		*ret_string = temp;
+		*orig_string = string;
+		return 0;
+	}
+	return -ENODEV;
+}
+	
+
+static int namedev_init_config(void)
+{
+	char filename[255];
+	char line[255];
+	char *temp;
+	char *temp2;
+	char *temp3;
+	FILE *fd;
+	int retval = 0;
+	struct config_device dev;
+
+	strcpy(filename, NAMEDEV_CONFIG_ROOT NAMEDEV_CONFIG_FILE);
+	dbg("opening %s to read as permissions config", filename);
+	fd = fopen(filename, "r");
+	if (fd == NULL) {
+		dbg("Can't open %s", filename);
+		return -ENODEV;
+	}
+
+	/* loop through the whole file */
+	while (1) {
+		/* get a line */
+		temp = fgets(line, sizeof(line), fd);
+		if (temp == NULL)
+			break;
+
+		dbg("read %s", temp);
+
+		/* eat the whitespace at the beginning of the line */
+		while (isspace(*temp))
+			++temp;
+
+		/* no more line? */
+		if (*temp == 0x00)
+			continue;
+
+		/* see if this is a comment */
+		if (*temp == COMMENT_CHARACTER)
+			continue;
+
+		memset(&dev, 0x00, sizeof(dev));
+
+		/* parse the line */
+		temp2 = strsep(&temp, ",");
+		if (strcasecmp(temp2, TYPE_LABEL) == 0) {
+			/* label type */
+			dev.type = LABEL;
+
+			/* BUS="bus" */
+			retval = get_value("BUS", &temp, &temp3);
+			if (retval)
+				continue;
+			strcpy(dev.bus, temp3);
+			dbg("LABEL name = %s, bus = %s", dev.name, dev.bus);
+		}
+
+		if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
+			/* number type */
+			dev.type = NUMBER;
+
+			/* BUS="bus" */
+			retval = get_value("BUS", &temp, &temp3);
+			if (retval)
+				continue;
+			strcpy(dev.bus, temp3);
+			dbg("NUMBER name = %s, bus = %s", dev.name, dev.bus);
+		}
+
+		if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
+			/* number type */
+			dev.type = TOPOLOGY;
+
+			/* BUS="bus" */
+			retval = get_value("BUS", &temp, &temp3);
+			if (retval)
+				continue;
+			strcpy(dev.bus, temp3);
+			dbg("TOPOLOGY name = %s, bus = %s", dev.name, dev.bus);
+		}
+
+		if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
+			/* number type */
+			dev.type = REPLACE;
+
+			/* KERNEL="kernel_name" */
+			retval = get_value("KERNEL", &temp, &temp3);
+			if (retval)
+				continue;
+			strcpy(dev.kernel_name, temp3);
+
+			/* NAME="new_name" */
+			temp2 = strsep(&temp, ",");
+			retval = get_value("NAME", &temp, &temp3);
+			if (retval)
+				continue;
+			strcpy(dev.name, temp3);
+			dbg("REPLACE name = %s, kernel_name = %s", dev.name, dev.kernel_name);
+		}
+
+		retval = add_dev(&dev);
+		if (retval) {
+			dbg("add_dev returned with error %d", retval);
+			goto exit;
+		}
+	}
+
+exit:
+	fclose(fd);
+	return retval;
+}	
+
+
+static int namedev_init_permissions(void)
+{
+	char filename[255];
+	char line[255];
+	char *temp;
+	char *temp2;
+	FILE *fd;
+	int retval = 0;
+	struct config_device dev;
+
+	strcpy(filename, NAMEDEV_CONFIG_ROOT NAMEDEV_CONFIG_PERMISSION_FILE);
+	dbg("opening %s to read as permissions config", filename);
+	fd = fopen(filename, "r");
+	if (fd == NULL) {
+		dbg("Can't open %s", filename);
+		return -ENODEV;
+	}
+
+	/* loop through the whole file */
+	while (1) {
+		/* get a line */
+		temp = fgets(line, sizeof(line), fd);
+		if (temp == NULL)
+			break;
+
+		dbg("read %s", temp);
+
+		/* eat the whitespace at the beginning of the line */
+		while (isspace(*temp))
+			++temp;
+
+		/* no more line? */
+		if (*temp == 0x00)
+			continue;
+
+		/* see if this is a comment */
+		if (*temp == COMMENT_CHARACTER)
+			continue;
+
+		memset(&dev, 0x00, sizeof(dev));
+
+		/* parse the line */
+		temp2 = strsep(&temp, ":");
+		strncpy(dev.name, temp2, sizeof(dev.name));
+
+		temp2 = strsep(&temp, ":");
+		strncpy(dev.owner, temp2, sizeof(dev.owner));
+
+		temp2 = strsep(&temp, ":");
+		strncpy(dev.group, temp2, sizeof(dev.owner));
+
+		dev.mode = strtol(temp, NULL, 8);
+
+		dbg("name = %s, owner = %s, group = %s, mode = %x", dev.name, dev.owner, dev.group, dev.mode);
+		retval = add_dev(&dev);
+		if (retval) {
+			dbg("add_dev returned with error %d", retval);
+			goto exit;
+		}
+	}
+
+exit:
+	fclose(fd);
+	return retval;
+}	
+
+
+
+int namedev_init(void)
+{
+	int retval;
+
+	retval = namedev_init_config();
+	if (retval)
+		return retval;
+
+	retval = namedev_init_permissions();
+	if (retval)
+		return retval;
+
+	return retval;
+}
+