/* * namedev_parse.c * * Userspace devfs * * Copyright (C) 2003,2004 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. * */ #ifdef DEBUG /* define this to enable parsing debugging also */ /* #define DEBUG_PARSER */ #endif #include <stddef.h> #include <stdlib.h> #include <string.h> #include <stdio.h> #include <ctype.h> #include <unistd.h> #include <sys/stat.h> #include <errno.h> #include "udev.h" #include "udev_lib.h" #include "logging.h" #include "namedev.h" static int add_config_dev(struct config_device *new_dev) { struct config_device *tmp_dev; tmp_dev = malloc(sizeof(*tmp_dev)); if (tmp_dev == NULL) return -ENOMEM; memcpy(tmp_dev, new_dev, sizeof(*tmp_dev)); list_add_tail(&tmp_dev->node, &config_device_list); //dump_config_dev(tmp_dev); return 0; } void dump_config_dev(struct config_device *dev) { dbg_parse("name='%s', symlink='%s', bus='%s', place='%s', id='%s', " "sysfs_file[0]='%s', sysfs_value[0]='%s', " "kernel='%s', program='%s', result='%s'", "owner='%s', group='%s', mode=%#o", dev->name, dev->symlink, dev->bus, dev->place, dev->id, dev->sysfs_pair[0].file, dev->sysfs_pair[0].value, dev->kernel, dev->program, dev->result, dev->owner, dev->group, dev->mode); } void dump_config_dev_list(void) { struct config_device *dev; list_for_each_entry(dev, &config_device_list, node) dump_config_dev(dev); } static int add_perm_dev(struct perm_device *new_dev) { struct perm_device *dev; struct perm_device *tmp_dev; /* update the values if we already have the device */ list_for_each_entry(dev, &perm_device_list, node) { if (strcmp(new_dev->name, dev->name) != 0) continue; set_empty_perms(dev, new_dev->mode, new_dev->owner, new_dev->group); return 0; } /* not found, add new structure to the perm list */ tmp_dev = malloc(sizeof(*tmp_dev)); if (!tmp_dev) return -ENOMEM; memcpy(tmp_dev, new_dev, sizeof(*tmp_dev)); list_add_tail(&tmp_dev->node, &perm_device_list); //dump_perm_dev(tmp_dev); return 0; } void dump_perm_dev(struct perm_device *dev) { dbg_parse("name='%s', owner='%s', group='%s', mode=%#o", dev->name, dev->owner, dev->group, dev->mode); } void dump_perm_dev_list(void) { struct perm_device *dev; list_for_each_entry(dev, &perm_device_list, node) dump_perm_dev(dev); } /* extract possible KEY{attr} or KEY_attr */ static char *get_key_attribute(char *str) { char *pos; char *attr; attr = strchr(str, '{'); if (attr != NULL) { attr++; pos = strchr(attr, '}'); if (pos == NULL) { dbg("missing closing brace for format"); return NULL; } pos[0] = '\0'; dbg("attribute='%s'", attr); return attr; } attr = strchr(str, '_'); if (attr != NULL) { attr++; dbg("attribute='%s'", attr); return attr; } return NULL; } static int namedev_parse_rules(char *filename) { char line[255]; int lineno; char *temp; char *temp2; char *temp3; char *attr; char *buf; size_t bufsize; size_t cur; size_t count; int program_given = 0; int retval = 0; struct config_device dev; if (file_map(filename, &buf, &bufsize) == 0) { dbg("reading '%s' as rules file", filename); } else { dbg("can't open '%s' as rules file", filename); return -1; } /* loop through the whole file */ cur = 0; lineno = 0; while (1) { count = buf_get_line(buf, bufsize, cur); strncpy(line, buf + cur, count); line[count] = '\0'; temp = line; lineno++; cur += count+1; if (cur > bufsize) break; dbg_parse("read '%s'", temp); /* eat the whitespace */ while (isspace(*temp)) ++temp; /* empty line? */ if ((*temp == '\0') || (*temp == '\n')) continue; /* see if this is a comment */ if (*temp == COMMENT_CHARACTER) continue; memset(&dev, 0x00, sizeof(struct config_device)); /* get all known keys */ while (1) { retval = parse_get_pair(&temp, &temp2, &temp3); if (retval) break; if (strcasecmp(temp2, FIELD_BUS) == 0) { strfieldcpy(dev.bus, temp3); continue; } if (strcasecmp(temp2, FIELD_ID) == 0) { strfieldcpy(dev.id, temp3); continue; } if (strcasecmp(temp2, FIELD_PLACE) == 0) { strfieldcpy(dev.place, temp3); continue; } if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) { struct sysfs_pair *pair = &dev.sysfs_pair[0]; int sysfs_pair_num = 0; /* find first unused pair */ while (pair->file[0] != '\0') { ++sysfs_pair_num; if (sysfs_pair_num >= MAX_SYSFS_PAIRS) { pair = NULL; break; } ++pair; } if (pair) { attr = get_key_attribute(temp2 + sizeof(FIELD_SYSFS)-1); if (attr == NULL) { dbg("error parsing " FIELD_SYSFS " attribute"); continue; } strfieldcpy(pair->file, attr); strfieldcpy(pair->value, temp3); } continue; } if (strcasecmp(temp2, FIELD_KERNEL) == 0) { strfieldcpy(dev.kernel, temp3); continue; } if (strcasecmp(temp2, FIELD_PROGRAM) == 0) { program_given = 1; strfieldcpy(dev.program, temp3); continue; } if (strcasecmp(temp2, FIELD_RESULT) == 0) { strfieldcpy(dev.result, temp3); continue; } if (strncasecmp(temp2, FIELD_NAME, sizeof(FIELD_NAME)-1) == 0) { attr = get_key_attribute(temp2 + sizeof(FIELD_NAME)-1); if (attr != NULL) if (strcasecmp(attr, ATTR_PARTITIONS) == 0) { dbg_parse("creation of partition nodes requested"); dev.partitions = PARTITIONS_COUNT; } strfieldcpy(dev.name, temp3); continue; } if (strcasecmp(temp2, FIELD_SYMLINK) == 0) { strfieldcpy(dev.symlink, temp3); continue; } if (strcasecmp(temp2, FIELD_OWNER) == 0) { strfieldcpy(dev.owner, temp3); continue; } if (strcasecmp(temp2, FIELD_GROUP) == 0) { strfieldcpy(dev.group, temp3); continue; } if (strcasecmp(temp2, FIELD_MODE) == 0) { dev.mode = strtol(temp3, NULL, 8); continue; } dbg("unknown type of field '%s'", temp2); goto error; } /* simple plausibility checks for given keys */ if ((dev.sysfs_pair[0].file[0] == '\0') ^ (dev.sysfs_pair[0].value[0] == '\0')) { dbg("inconsistency in " FIELD_SYSFS " key"); goto error; } if ((dev.result[0] != '\0') && (program_given == 0)) { dbg(FIELD_RESULT " is only useful when " FIELD_PROGRAM " is called in any rule before"); goto error; } dev.config_line = lineno; strfieldcpy(dev.config_file, filename); retval = add_config_dev(&dev); if (retval) { dbg("add_config_dev returned with error %d", retval); continue; error: dbg("%s:%d:%d: parse error, rule skipped", filename, lineno, temp - line); } } file_unmap(buf, bufsize); return retval; } static int namedev_parse_permissions(char *filename) { char line[255]; char *temp; char *temp2; char *buf; size_t bufsize; size_t cur; size_t count; int retval = 0; struct perm_device dev; if (file_map(filename, &buf, &bufsize) == 0) { dbg("reading '%s' as permissions file", filename); } else { dbg("can't open '%s' as permissions file", filename); return -1; } /* loop through the whole file */ cur = 0; while (1) { count = buf_get_line(buf, bufsize, cur); strncpy(line, buf + cur, count); line[count] = '\0'; temp = line; cur += count+1; if (cur > bufsize) break; dbg_parse("read '%s'", temp); /* eat the whitespace at the beginning of the line */ while (isspace(*temp)) ++temp; /* empty line? */ if ((*temp == '\0') || (*temp == '\n')) continue; /* see if this is a comment */ if (*temp == COMMENT_CHARACTER) continue; memset(&dev, 0x00, sizeof(dev)); /* parse the line */ temp2 = strsep(&temp, ":"); if (!temp2) { dbg("cannot parse line '%s'", line); continue; } strfieldcpy(dev.name, temp2); temp2 = strsep(&temp, ":"); if (!temp2) { dbg("cannot parse line '%s'", line); continue; } strfieldcpy(dev.owner, temp2); temp2 = strsep(&temp, ":"); if (!temp2) { dbg("cannot parse line '%s'", line); continue; } strfieldcpy(dev.group, temp2); if (!temp) { dbg("cannot parse line '%s'", line); continue; } dev.mode = strtol(temp, NULL, 8); dbg_parse("name='%s', owner='%s', group='%s', mode=%#o", dev.name, dev.owner, dev.group, dev.mode); retval = add_perm_dev(&dev); if (retval) { dbg("add_perm_dev returned with error %d", retval); goto exit; } } exit: file_unmap(buf, bufsize); return retval; } int namedev_init_rules() { struct stat stats; stat(udev_rules_filename, &stats); if ((stats.st_mode & S_IFMT) != S_IFDIR) return namedev_parse_rules(udev_rules_filename); else return call_foreach_file(namedev_parse_rules, udev_rules_filename, RULEFILE_SUFFIX); } int namedev_init_permissions() { struct stat stats; stat(udev_permissions_filename, &stats); if ((stats.st_mode & S_IFMT) != S_IFDIR) return namedev_parse_permissions(udev_permissions_filename); else return call_foreach_file(namedev_parse_permissions, udev_permissions_filename, PERMFILE_SUFFIX); }