433 lines
9.5 KiB
C
433 lines
9.5 KiB
C
/*
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* namedev_parse.c
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*
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* Userspace devfs
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*
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* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
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*
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/* define this to enable parsing debugging */
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/* #define DEBUG_PARSER */
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <errno.h>
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#include "udev.h"
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#include "namedev.h"
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static int add_config_dev(struct config_device *new_dev)
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{
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struct config_device *tmp_dev;
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tmp_dev = malloc(sizeof(*tmp_dev));
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if (tmp_dev == NULL)
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return -ENOMEM;
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memcpy(tmp_dev, new_dev, sizeof(*tmp_dev));
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list_add_tail(&tmp_dev->node, &config_device_list);
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//dump_config_dev(tmp_dev);
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return 0;
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}
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int get_pair(char **orig_string, char **left, char **right)
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{
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char *temp;
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char *string = *orig_string;
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if (!string)
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return -ENODEV;
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/* eat any whitespace */
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while (isspace(*string) || *string == ',')
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++string;
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/* split based on '=' */
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temp = strsep(&string, "=");
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*left = temp;
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if (!string)
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return -ENODEV;
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/* take the right side and strip off the '"' */
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while (isspace(*string))
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++string;
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if (*string == '"')
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++string;
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else
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return -ENODEV;
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temp = strsep(&string, "\"");
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if (!string || *temp == '\0')
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return -ENODEV;
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*right = temp;
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*orig_string = string;
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return 0;
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}
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void dump_config_dev(struct config_device *dev)
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{
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switch (dev->type) {
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case KERNEL_NAME:
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dbg_parse("KERNEL name='%s'", dev->name);
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break;
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case LABEL:
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dbg_parse("LABEL name='%s', bus='%s', sysfs_file[0]='%s', sysfs_value[0]='%s'",
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dev->name, dev->bus, dev->sysfs_pair[0].file, dev->sysfs_pair[0].value);
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break;
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case NUMBER:
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dbg_parse("NUMBER name='%s', bus='%s', id='%s'",
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dev->name, dev->bus, dev->id);
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break;
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case TOPOLOGY:
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dbg_parse("TOPOLOGY name='%s', bus='%s', place='%s'",
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dev->name, dev->bus, dev->place);
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break;
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case REPLACE:
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dbg_parse("REPLACE name=%s, kernel_name=%s",
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dev->name, dev->kernel_name);
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break;
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case CALLOUT:
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dbg_parse("CALLOUT name='%s', bus='%s', program='%s', id='%s'",
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dev->name, dev->bus, dev->exec_program, dev->id);
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break;
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default:
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dbg_parse("unknown type of method");
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}
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}
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void dump_config_dev_list(void)
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{
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struct list_head *tmp;
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list_for_each(tmp, &config_device_list) {
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struct config_device *dev = list_entry(tmp, struct config_device, node);
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dump_config_dev(dev);
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}
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}
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void dump_perm_dev(struct perm_device *dev)
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{
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dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
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dev->name, dev->owner, dev->group, dev->mode);
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}
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void dump_perm_dev_list(void)
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{
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struct list_head *tmp;
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list_for_each(tmp, &perm_device_list) {
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struct perm_device *dev = list_entry(tmp, struct perm_device, node);
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dump_perm_dev(dev);
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}
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}
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int namedev_init_rules(void)
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{
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char line[255];
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int lineno;
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char *temp;
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char *temp2;
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char *temp3;
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FILE *fd;
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int retval = 0;
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struct config_device dev;
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fd = fopen(udev_rules_filename, "r");
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if (fd != NULL) {
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dbg("reading '%s' as rules file", udev_rules_filename);
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} else {
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dbg("can't open '%s' as a rules file", udev_rules_filename);
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return -ENODEV;
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}
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/* loop through the whole file */
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lineno = 0;
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while (1) {
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/* get a line */
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temp = fgets(line, sizeof(line), fd);
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if (temp == NULL)
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goto exit;
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lineno++;
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dbg_parse("read '%s'", temp);
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/* eat the whitespace */
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while (isspace(*temp))
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++temp;
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/* empty line? */
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if ((*temp == 0x00) || (*temp == 0x0a))
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continue;
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/* see if this is a comment */
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if (*temp == COMMENT_CHARACTER)
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continue;
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memset(&dev, 0x00, sizeof(struct config_device));
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/* get the method */
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temp2 = strsep(&temp, ",");
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if (strcasecmp(temp2, TYPE_LABEL) == 0) {
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dev.type = LABEL;
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goto keys;
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}
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if (strcasecmp(temp2, TYPE_NUMBER) == 0) {
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dev.type = NUMBER;
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goto keys;
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}
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if (strcasecmp(temp2, TYPE_TOPOLOGY) == 0) {
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dev.type = TOPOLOGY;
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goto keys;
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}
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if (strcasecmp(temp2, TYPE_REPLACE) == 0) {
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dev.type = REPLACE;
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goto keys;
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}
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if (strcasecmp(temp2, TYPE_CALLOUT) == 0) {
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dev.type = CALLOUT;
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goto keys;
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}
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dbg_parse("unknown type of method '%s'", temp2);
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goto error;
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keys:
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/* get all known keys */
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while (1) {
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retval = get_pair(&temp, &temp2, &temp3);
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if (retval)
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break;
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if (strcasecmp(temp2, FIELD_BUS) == 0) {
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strfieldcpy(dev.bus, temp3);
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continue;
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}
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if (strcasecmp(temp2, FIELD_ID) == 0) {
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strfieldcpy(dev.id, temp3);
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continue;
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}
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if (strcasecmp(temp2, FIELD_PLACE) == 0) {
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strfieldcpy(dev.place, temp3);
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continue;
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}
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if (strncasecmp(temp2, FIELD_SYSFS, sizeof(FIELD_SYSFS)-1) == 0) {
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struct sysfs_pair *pair = &dev.sysfs_pair[0];
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int sysfs_pair_num = 0;
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/* find first unused pair */
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while (pair->file[0] != '\0') {
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++sysfs_pair_num;
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if (sysfs_pair_num >= MAX_SYSFS_PAIRS) {
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pair = NULL;
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break;
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}
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++pair;
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}
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if (pair) {
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/* remove prepended 'SYSFS_' */
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strfieldcpy(pair->file, temp2 + sizeof(FIELD_SYSFS)-1);
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strfieldcpy(pair->value, temp3);
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}
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continue;
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}
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if (strcasecmp(temp2, FIELD_KERNEL) == 0) {
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strfieldcpy(dev.kernel_name, temp3);
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continue;
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}
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if (strcasecmp(temp2, FIELD_PROGRAM) == 0) {
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strfieldcpy(dev.exec_program, temp3);
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continue;
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}
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if (strcasecmp(temp2, FIELD_NAME) == 0) {
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strfieldcpy(dev.name, temp3);
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continue;
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}
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if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
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strfieldcpy(dev.symlink, temp3);
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continue;
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}
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dbg_parse("unknown type of field '%s'", temp2);
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}
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/* check presence of keys according to method type */
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switch (dev.type) {
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case LABEL:
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dbg_parse(TYPE_LABEL " name='%s', bus='%s', "
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"sysfs_file[0]='%s', sysfs_value[0]='%s', symlink='%s'",
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dev.name, dev.bus, dev.sysfs_pair[0].file,
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dev.sysfs_pair[0].value, dev.symlink);
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if ((*dev.name == '\0') ||
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(*dev.bus == '\0') ||
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(*dev.sysfs_pair[0].file == '\0') ||
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(*dev.sysfs_pair[0].value == '\0'))
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goto error;
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break;
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case NUMBER:
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dbg_parse(TYPE_NUMBER "name='%s', bus='%s', id='%s', symlink='%s'",
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dev.name, dev.bus, dev.id, dev.symlink);
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if ((*dev.name == '\0') ||
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(*dev.bus == '\0') ||
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(*dev.id == '\0'))
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goto error;
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break;
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case TOPOLOGY:
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dbg_parse(TYPE_TOPOLOGY "name='%s', bus='%s', "
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"place='%s', symlink='%s'",
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dev.name, dev.bus, dev.place, dev.symlink);
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if ((*dev.name == '\0') ||
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(*dev.bus == '\0') ||
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(*dev.place == '\0'))
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goto error;
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break;
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case REPLACE:
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dbg_parse(TYPE_REPLACE "name='%s', kernel_name='%s', symlink='%s'",
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dev.name, dev.kernel_name, dev.symlink);
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if ((*dev.name == '\0') ||
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(*dev.kernel_name == '\0'))
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goto error;
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break;
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case CALLOUT:
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dbg_parse(TYPE_CALLOUT "name='%s', bus='%s', program='%s', "
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"id='%s', symlink='%s'",
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dev.name, dev.bus, dev.exec_program,
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dev.id, dev.symlink);
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if ((*dev.name == '\0') ||
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(*dev.id == '\0') ||
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(*dev.exec_program == '\0'))
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goto error;
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break;
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default:
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dbg_parse("unknown type of method");
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goto error;
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}
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retval = add_config_dev(&dev);
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if (retval) {
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dbg("add_config_dev returned with error %d", retval);
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continue;
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}
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}
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error:
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dbg_parse("%s:%d:%Zd: field missing or parse error", udev_rules_filename,
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lineno, temp - line);
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exit:
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fclose(fd);
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return retval;
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}
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int namedev_init_permissions(void)
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{
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char line[255];
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char *temp;
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char *temp2;
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FILE *fd;
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int retval = 0;
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struct perm_device dev;
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fd = fopen(udev_permissions_filename, "r");
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if (fd != NULL) {
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dbg("reading '%s' as permissions file", udev_permissions_filename);
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} else {
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dbg("can't open '%s' as permissions file", udev_permissions_filename);
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return -ENODEV;
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}
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/* loop through the whole file */
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while (1) {
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temp = fgets(line, sizeof(line), fd);
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if (temp == NULL)
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break;
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dbg_parse("read '%s'", temp);
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/* eat the whitespace at the beginning of the line */
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while (isspace(*temp))
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++temp;
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/* empty line? */
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if ((*temp == 0x00) || (*temp == 0x0a))
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continue;
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/* see if this is a comment */
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if (*temp == COMMENT_CHARACTER)
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continue;
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memset(&dev, 0x00, sizeof(dev));
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/* parse the line */
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temp2 = strsep(&temp, ":");
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if (!temp2) {
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dbg("cannot parse line '%s'", line);
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continue;
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}
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strncpy(dev.name, temp2, sizeof(dev.name));
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temp2 = strsep(&temp, ":");
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if (!temp2) {
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dbg("cannot parse line '%s'", line);
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continue;
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}
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strncpy(dev.owner, temp2, sizeof(dev.owner));
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temp2 = strsep(&temp, ":");
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if (!temp2) {
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dbg("cannot parse line '%s'", line);
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continue;
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}
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strncpy(dev.group, temp2, sizeof(dev.owner));
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if (!temp) {
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dbg("cannot parse line: %s", line);
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continue;
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}
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dev.mode = strtol(temp, NULL, 8);
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dbg_parse("name='%s', owner='%s', group='%s', mode=%#o",
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dev.name, dev.owner, dev.group,
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dev.mode);
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retval = add_perm_dev(&dev);
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if (retval) {
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dbg("add_perm_dev returned with error %d", retval);
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goto exit;
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}
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}
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exit:
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fclose(fd);
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return retval;
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}
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