diff options
Diffstat (limited to 'namedev.c')
| -rw-r--r-- | namedev.c | 345 |
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; +} + |