udev_utils.c revision 17fcfb5972977b6a3aedca6ad2aa8d1fbfbc761d
/*
* Copyright (C) 2004-2008 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, either version 2 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <dirent.h>
#include <syslog.h>
#include <pwd.h>
#include <grp.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include "udev.h"
struct name_entry *name_list_add(struct udev *udev, struct list_head *name_list, const char *name, int sort)
{
struct name_entry *name_loop;
struct name_entry *name_new;
/* avoid duplicate entries */
list_for_each_entry(name_loop, name_list, node) {
if (strcmp(name_loop->name, name) == 0) {
dbg(udev, "'%s' is already in the list\n", name);
return name_loop;
}
}
if (sort)
list_for_each_entry(name_loop, name_list, node) {
if (strcmp(name_loop->name, name) > 0)
break;
}
name_new = malloc(sizeof(struct name_entry));
if (name_new == NULL)
return NULL;
memset(name_new, 0x00, sizeof(struct name_entry));
util_strlcpy(name_new->name, name, sizeof(name_new->name));
dbg(udev, "adding '%s'\n", name_new->name);
list_add_tail(&name_new->node, &name_loop->node);
return name_new;
}
struct name_entry *name_list_key_add(struct udev *udev, struct list_head *name_list, const char *key, const char *value)
{
struct name_entry *name_loop;
struct name_entry *name_new;
size_t keylen = strlen(key);
list_for_each_entry(name_loop, name_list, node) {
if (strncmp(name_loop->name, key, keylen) != 0)
continue;
if (name_loop->name[keylen] != '=')
continue;
dbg(udev, "key already present '%s', replace it\n", name_loop->name);
snprintf(name_loop->name, sizeof(name_loop->name), "%s=%s", key, value);
name_loop->name[sizeof(name_loop->name)-1] = '\0';
return name_loop;
}
name_new = malloc(sizeof(struct name_entry));
if (name_new == NULL)
return NULL;
memset(name_new, 0x00, sizeof(struct name_entry));
snprintf(name_new->name, sizeof(name_new->name), "%s=%s", key, value);
name_new->name[sizeof(name_new->name)-1] = '\0';
dbg(udev, "adding '%s'\n", name_new->name);
list_add_tail(&name_new->node, &name_loop->node);
return name_new;
}
int name_list_key_remove(struct udev *udev, struct list_head *name_list, const char *key)
{
struct name_entry *name_loop;
struct name_entry *name_tmp;
size_t keylen = strlen(key);
int retval = 0;
list_for_each_entry_safe(name_loop, name_tmp, name_list, node) {
if (strncmp(name_loop->name, key, keylen) != 0)
continue;
if (name_loop->name[keylen] != '=')
continue;
list_del(&name_loop->node);
free(name_loop);
retval = 1;
break;
}
return retval;
}
void name_list_cleanup(struct udev *udev, struct list_head *name_list)
{
struct name_entry *name_loop;
struct name_entry *name_tmp;
list_for_each_entry_safe(name_loop, name_tmp, name_list, node) {
list_del(&name_loop->node);
free(name_loop);
}
}
/* calls function for every file found in specified directory */
int add_matching_files(struct udev *udev, struct list_head *name_list, const char *dirname, const char *suffix)
{
struct dirent *ent;
DIR *dir;
char filename[UTIL_PATH_SIZE];
dbg(udev, "open directory '%s'\n", dirname);
dir = opendir(dirname);
if (dir == NULL) {
err(udev, "unable to open '%s': %s\n", dirname, strerror(errno));
return -1;
}
while (1) {
ent = readdir(dir);
if (ent == NULL || ent->d_name[0] == '\0')
break;
if ((ent->d_name[0] == '.') || (ent->d_name[0] == '#'))
continue;
/* look for file matching with specified suffix */
if (suffix != NULL) {
const char *ext;
ext = strrchr(ent->d_name, '.');
if (ext == NULL)
continue;
if (strcmp(ext, suffix) != 0)
continue;
}
dbg(udev, "put file '%s/%s' into list\n", dirname, ent->d_name);
snprintf(filename, sizeof(filename), "%s/%s", dirname, ent->d_name);
filename[sizeof(filename)-1] = '\0';
name_list_add(udev, name_list, filename, 1);
}
closedir(dir);
return 0;
}
uid_t lookup_user(struct udev *udev, const char *user)
{
struct passwd *pw;
uid_t uid = 0;
errno = 0;
pw = getpwnam(user);
if (pw == NULL) {
if (errno == 0 || errno == ENOENT || errno == ESRCH)
err(udev, "specified user '%s' unknown\n", user);
else
err(udev, "error resolving user '%s': %s\n", user, strerror(errno));
} else
uid = pw->pw_uid;
return uid;
}
extern gid_t lookup_group(struct udev *udev, const char *group)
{
struct group *gr;
gid_t gid = 0;
errno = 0;
gr = getgrnam(group);
if (gr == NULL) {
if (errno == 0 || errno == ENOENT || errno == ESRCH)
err(udev, "specified group '%s' unknown\n", group);
else
err(udev, "error resolving group '%s': %s\n", group, strerror(errno));
} else
gid = gr->gr_gid;
return gid;
}