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systemd/namedev_parse.c
greg@kroah.com 851cd18d81 [PATCH] Add some helpful messages if the user uses the older config file format
Also fail a rule that we can not parse, as we can easily create incorrect rules
if we do not do this.
2005-04-26 21:13:15 -07:00

349 lines
7.4 KiB
C

/*
* namedev_parse.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.
*
*/
#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 <fcntl.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include "udev.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;
}
int get_pair(char **orig_string, char **left, char **right)
{
char *temp;
char *string = *orig_string;
if (!string)
return -ENODEV;
/* eat any whitespace */
while (isspace(*string) || *string == ',')
++string;
/* split based on '=' */
temp = strsep(&string, "=");
*left = temp;
if (!string)
return -ENODEV;
/* take the right side and strip off the '"' */
while (isspace(*string))
++string;
if (*string == '"')
++string;
else
return -ENODEV;
temp = strsep(&string, "\"");
if (!string || *temp == '\0')
return -ENODEV;
*right = temp;
*orig_string = string;
return 0;
}
void dump_config_dev(struct config_device *dev)
{
/*FIXME dump all sysfs's */
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'",
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);
}
void dump_config_dev_list(void)
{
struct config_device *dev;
list_for_each_entry(dev, &config_device_list, node)
dump_config_dev(dev);
}
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);
}
int namedev_init_rules(void)
{
char line[255];
int lineno;
char *temp;
char *temp2;
char *temp3;
FILE *fd;
int program_given = 0;
int retval = 0;
struct config_device dev;
fd = fopen(udev_rules_filename, "r");
if (fd != NULL) {
dbg("reading '%s' as rules file", udev_rules_filename);
} else {
dbg("can't open '%s' as a rules file", udev_rules_filename);
return -ENODEV;
}
/* loop through the whole file */
lineno = 0;
while (1) {
/* get a line */
temp = fgets(line, sizeof(line), fd);
if (temp == NULL)
goto exit;
lineno++;
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 = 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) {
/* remove prepended 'SYSFS_' */
strfieldcpy(pair->file, temp2 + sizeof(FIELD_SYSFS)-1);
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 (strcasecmp(temp2, FIELD_NAME) == 0) {
strfieldcpy(dev.name, temp3);
continue;
}
if (strcasecmp(temp2, FIELD_SYMLINK) == 0) {
strfieldcpy(dev.symlink, temp3);
continue;
}
dbg("unknown type of field '%s'", temp2);
dbg("You might be using a rules file in the old format, please fix.");
goto error;
}
/* simple plausibility check for given keys */
if ((dev.sysfs_pair[0].file[0] == '\0') ^
(dev.sysfs_pair[0].value[0] == '\0')) {
dbg("inconsistency in SYSFS_ key");
goto error;
}
if ((dev.result[0] != '\0') && (program_given == 0)) {
dbg("RESULT is only useful when PROGRAM called in any rule before");
goto error;
}
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",
udev_rules_filename, lineno, temp - line);
}
}
exit:
fclose(fd);
return retval;
}
int namedev_init_permissions(void)
{
char line[255];
char *temp;
char *temp2;
FILE *fd;
int retval = 0;
struct perm_device dev;
fd = fopen(udev_permissions_filename, "r");
if (fd != NULL) {
dbg("reading '%s' as permissions file", udev_permissions_filename);
} else {
dbg("can't open '%s' as permissions file", udev_permissions_filename);
return -ENODEV;
}
/* loop through the whole file */
while (1) {
temp = fgets(line, sizeof(line), fd);
if (temp == NULL)
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;
}
strncpy(dev.name, temp2, sizeof(dev.name));
temp2 = strsep(&temp, ":");
if (!temp2) {
dbg("cannot parse line '%s'", line);
continue;
}
strncpy(dev.owner, temp2, sizeof(dev.owner));
temp2 = strsep(&temp, ":");
if (!temp2) {
dbg("cannot parse line '%s'", line);
continue;
}
strncpy(dev.group, temp2, sizeof(dev.owner));
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:
fclose(fd);
return retval;
}