/* * namedev.c * * Userspace devfs * * Copyright (C) 2003 Greg Kroah-Hartman * * * 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 #include #include #include #include #include #include #include #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; }