picnoir/Systemd
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity
Systemd/udev_db.c
Kay Sievers 13d11705bf switch some strlcpy's to memcpy 
strlcpy counts the sourec string lengt and is therefore not suitable
to copy a defined length of characters from one string to another.

Signed-off-by: Kay Sievers <kay.sievers@suse.de>
2005-08-08 02:21:55 +02:00

357 lines
8 KiB
C
Raw Blame History

/*
* udev_db.c
*
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
*
* 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include "libsysfs/sysfs/libsysfs.h"
#include "udev_libc_wrapper.h"
#include "udev.h"
#include "udev_utils.h"
#include "logging.h"
#include "udev_db.h"
#define PATH_TO_NAME_CHAR '@'
static int get_db_filename(const char *devpath, char *filename, int len)
{
char temp[PATH_SIZE];
char *pos;
/* replace '/' to transform path into a filename */
strlcpy(temp, devpath, sizeof(temp));
pos = strchr(&temp[1], '/');
while (pos) {
pos[0] = PATH_TO_NAME_CHAR;
pos = strchr(&pos[1], '/');
}
snprintf(filename, len, "%s%s", udev_db_path, temp);
filename[len-1] = '\0';
return 0;
}
int udev_db_add_device(struct udevice *udev)
{
char filename[PATH_SIZE];
struct name_entry *name_loop;
FILE *f;
if (udev->test_run)
return 0;
/* don't write anything if udev created only the node with the
* kernel name without any interesting data to remember
*/
if (strcmp(udev->name, udev->kernel_name) == 0 &&
list_empty(&udev->symlink_list) && list_empty(&udev->env_list) &&
!udev->partitions && !udev->ignore_remove) {
dbg("nothing interesting to store in udevdb, skip");
goto exit;
}
get_db_filename(udev->devpath, filename, sizeof(filename));
create_path(filename);
f = fopen(filename, "w");
if (f == NULL) {
err("unable to create db file '%s'", filename);
return -1;
}
dbg("storing data for device '%s' in '%s'", udev->devpath, filename);
fprintf(f, "P:%s\n", udev->devpath);
fprintf(f, "N:%s\n", udev->name);
list_for_each_entry(name_loop, &udev->symlink_list, node)
fprintf(f, "S:%s\n", name_loop->name);
fprintf(f, "M:%u:%u\n", major(udev->devt), minor(udev->devt));
if (udev->partitions)
fprintf(f, "A:%u\n", udev->partitions);
if (udev->ignore_remove)
fprintf(f, "R:%u\n", udev->ignore_remove);
list_for_each_entry(name_loop, &udev->env_list, node)
fprintf(f, "E:%s\n", name_loop->name);
fclose(f);
exit:
return 0;
}
static int parse_db_file(struct udevice *udev, const char *filename)
{
char line[PATH_SIZE];
unsigned int major, minor;
char *bufline;
char *buf;
size_t bufsize;
size_t cur;
size_t count;
if (file_map(filename, &buf, &bufsize) != 0) {
err("unable to read db file '%s'", filename);
return -1;
}
cur = 0;
while (cur < bufsize) {
count = buf_get_line(buf, bufsize, cur);
bufline = &buf[cur];
cur += count+1;
switch(bufline[0]) {
case 'P':
if (count > sizeof(udev->devpath))
count = sizeof(udev->devpath);
memcpy(udev->devpath, &bufline[2], count-2);
udev->devpath[count-2] = '\0';
break;
case 'N':
if (count > sizeof(udev->name))
count = sizeof(udev->name);
memcpy(udev->name, &bufline[2], count-2);
udev->name[count-2] = '\0';
break;
case 'M':
if (count > sizeof(line))
count = sizeof(line);
memcpy(line, &bufline[2], count-2);
line[count-2] = '\0';
sscanf(line, "%u:%u", &major, &minor);
udev->devt = makedev(major, minor);
break;
case 'S':
if (count > sizeof(line))
count = sizeof(line);
memcpy(line, &bufline[2], count-2);
line[count-2] = '\0';
name_list_add(&udev->symlink_list, line, 0);
break;
case 'A':
if (count > sizeof(line))
count = sizeof(line);
memcpy(line, &bufline[2], count-2);
line[count-2] = '\0';
udev->partitions = atoi(line);
break;
case 'R':
if (count > sizeof(line))
count = sizeof(line);
memcpy(line, &bufline[2], count-2);
line[count-2] = '\0';
udev->ignore_remove = atoi(line);
break;
case 'E':
if (count > sizeof(line))
count = sizeof(line);
memcpy(line, &bufline[2], count-2);
line[count-2] = '\0';
name_list_add(&udev->env_list, line, 0);
break;
}
}
file_unmap(buf, bufsize);
if (udev->name[0] == '\0')
return -1;
return 0;
}
int udev_db_delete_device(struct udevice *udev)
{
char filename[PATH_SIZE];
get_db_filename(udev->devpath, filename, sizeof(filename));
unlink(filename);
return 0;
}
int udev_db_get_device(struct udevice *udev, const char *devpath)
{
char filename[PATH_SIZE];
get_db_filename(devpath, filename, sizeof(filename));
if (parse_db_file(udev, filename) != 0)
return -1;
return 0;
}
int udev_db_search_name(char *devpath, size_t len, const char *name)
{
DIR *dir;
dir = opendir(udev_db_path);
if (dir == NULL) {
err("unable to open udev_db '%s'", udev_db_path);
return -1;
}
while (1) {
struct dirent *ent;
char filename[PATH_SIZE];
char path[PATH_SIZE];
char nodename[PATH_SIZE];
char *bufline;
char *buf;
size_t bufsize;
size_t cur;
size_t count;
ent = readdir(dir);
if (ent == NULL || ent->d_name[0] == '\0')
break;
if (ent->d_name[0] == '.')
continue;
snprintf(filename, sizeof(filename), "%s/%s", udev_db_path, ent->d_name);
filename[sizeof(filename)-1] = '\0';
dbg("looking at '%s'", filename);
if (file_map(filename, &buf, &bufsize) != 0) {
err("unable to read db file '%s'", filename);
continue;
}
cur = 0;
while (cur < bufsize) {
count = buf_get_line(buf, bufsize, cur);
bufline = &buf[cur];
cur += count+1;
switch(bufline[0]) {
case 'P':
if (count > sizeof(path))
count = sizeof(path);
memcpy(path, &bufline[2], count-2);
path[count-2] = '\0';
break;
case 'N':
case 'S':
if (count > sizeof(nodename))
count = sizeof(nodename);
memcpy(nodename, &bufline[2], count-2);
nodename[count-2] = '\0';
dbg("compare '%s' '%s'", nodename, name);
if (strcmp(nodename, name) == 0) {
memcpy(devpath, &bufline[2], count-2);
devpath[count-2] = '\0';
file_unmap(buf, bufsize);
closedir(dir);
return 0;
}
break;
default:
continue;
}
}
file_unmap(buf, bufsize);
}
closedir(dir);
return -1;
}
int udev_db_dump_names(int (*handler_function)(const char *path, const char *name))
{
DIR *dir;
dir = opendir(udev_db_path);
if (dir == NULL) {
err("unable to open udev_db '%s'", udev_db_path);
return -1;
}
while (1) {
struct dirent *ent;
char filename[PATH_SIZE];
char path[PATH_SIZE];
char nodename[PATH_SIZE];
char *bufline;
char *buf;
size_t bufsize;
size_t cur;
size_t count;
ent = readdir(dir);
if (ent == NULL || ent->d_name[0] == '\0')
break;
if (ent->d_name[0] == '.')
continue;
snprintf(filename, sizeof(filename), "%s/%s", udev_db_path, ent->d_name);
filename[sizeof(filename)-1] = '\0';
dbg("looking at '%s'", filename);
if (file_map(filename, &buf, &bufsize) != 0) {
err("unable to read db file '%s'", filename);
continue;
}
path[0] = '\0';
nodename[0] = '\0';
cur = 0;
while (cur < bufsize) {
count = buf_get_line(buf, bufsize, cur);
bufline = &buf[cur];
cur += count+1;
switch(bufline[0]) {
case 'P':
if (count > sizeof(path))
count = sizeof(path);
memcpy(path, &bufline[2], count-2);
path[count-2] = '\0';
break;
case 'N':
if (count > sizeof(nodename))
count = sizeof(nodename);
memcpy(nodename, &bufline[2], count-2);
nodename[count-2] = '\0';
break;
default:
continue;
}
}
file_unmap(buf, bufsize);
if (path[0] == '\0' || nodename[0] == '\0')
continue;
if (handler_function(path, nodename) != 0)
break;
}
closedir(dir);
return 0;
}
Reference in a new issue View git blame Copy permalink