Added /etc/mdev.conf support. Adds about 1.9k to mdev.

This commit is contained in:
Rob Landley 2005-12-17 10:52:30 +00:00
parent 1a78103306
commit b56c285da5
2 changed files with 123 additions and 16 deletions

View File

@ -254,7 +254,7 @@ config CONFIG_MDEV
have it handle hotplug events afterwards. Device names are taken
from sysfs.
config CONFIG_FEATURE_MDEV_CONFIG
config CONFIG_FEATURE_MDEV_CONF
bool " Support /etc/mdev.conf"
default n
depends on CONFIG_MDEV

View File

@ -8,25 +8,31 @@
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "busybox.h"
#include "xregex.h"
#define DEV_PATH "/dev"
#define DEV_MODE 0660
#define DEV_PATH "/tmp/dev"
#include <busybox.h>
/* mknod in /dev based on a path like "/sys/block/hda/hda1" */
void make_device(char *path)
static void make_device(char *path)
{
char *device_name, *s;
char *device_name,*s;
int major,minor,type,len,fd;
int mode=0660;
uid_t uid=0;
gid_t gid=0;
RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
@ -44,8 +50,8 @@ void make_device(char *path)
device_name = strrchr(path, '/') + 1;
type = strncmp(path+5, "block/" ,6) ? S_IFCHR : S_IFBLK;
major = minor = 0;
for(s = temp; *s; s++) {
if(*s == ':') {
for (s = temp; *s; s++) {
if (*s == ':') {
major = minor;
minor = 0;
} else {
@ -54,13 +60,114 @@ void make_device(char *path)
}
}
/* Open config file here, look up permissions */
/* If we have a config file, look up permissions for this device */
if (ENABLE_FEATURE_MDEV_CONF) {
char *conf,*pos,*end;
/* mmap the config file */
if (-1!=(fd=open("/etc/mdev.conf",O_RDONLY))) {
len=lseek(fd,0,SEEK_END);
conf=mmap(NULL,len,PROT_READ,MAP_SHARED,fd,0);
if (conf) {
int line=0;
/* Loop through lines in mmaped file*/
for (pos=conf;pos-conf<len;) {
int field;
char *end2;
line++;
/* find end of this line */
for(end=pos;end-conf<len && *end!='\n';end++);
/* Three fields: regex, uid:gid, mode */
for (field=3;field;field--) {
/* Skip whitespace */
while (pos<end && isspace(*pos)) pos++;
if (pos==end || *pos=='#') break;
for (end2=pos;
end2<end && !isspace(*end2) && *end2!='#'; end2++);
switch(field) {
/* Regex to match this device */
case 3:
{
char *regex=strndupa(pos,end2-pos);
regex_t match;
regmatch_t off;
int result;
/* Is this it? */
xregcomp(&match,regex,REG_EXTENDED);
result=regexec(&match,device_name,1,&off,0);
regfree(&match);
/* If not this device, skip rest of line */
if(result || off.rm_so
|| off.rm_eo!=strlen(device_name))
goto end_line;
break;
}
/* uid:gid */
case 2:
{
char *s2;
/* Find : */
for(s=pos;s<end2 && *s!=':';s++);
if(s==end2) goto end_line;
/* Parse UID */
uid=strtoul(pos,&s2,10);
if(s!=s2) {
struct passwd *pass;
pass=getpwnam(strndupa(pos,s-pos));
if(!pass) goto end_line;
uid=pass->pw_uid;
}
s++;
/* parse GID */
gid=strtoul(s,&s2,10);
if(end2!=s2) {
struct group *grp;
grp=getgrnam(strndupa(s,end2-s));
if(!grp) goto end_line;
gid=grp->gr_gid;
}
break;
}
/* mode */
case 1:
{
mode=strtoul(pos,&pos,8);
if(pos!=end2) goto end_line;
goto found_device;
}
}
pos=end2;
}
end_line:
/* Did everything parse happily? */
if (field && field!=3)
bb_error_msg_and_die("Bad line %d",line);
/* Next line */
pos=++end;
}
found_device:
munmap(conf,len);
}
close(fd);
}
}
sprintf(temp, "%s/%s", DEV_PATH, device_name);
if(mknod(temp, DEV_MODE | type, makedev(major, minor)) && errno != EEXIST)
umask(0);
if (mknod(temp, mode | type, makedev(major, minor)) && errno != EEXIST)
bb_perror_msg_and_die("mknod %s failed", temp);
/* Perform shellout here */
if (ENABLE_FEATURE_MDEV_CONF) chown(temp,uid,gid);
end:
RELEASE_CONFIG_BUFFER(temp);
@ -69,18 +176,18 @@ end:
/* Recursive search of /sys/block or /sys/class. path must be a writeable
* buffer of size PATH_MAX containing the directory string to start at. */
void find_dev(char *path)
static void find_dev(char *path)
{
DIR *dir;
int len=strlen(path);
if(!(dir = opendir(path)))
if (!(dir = opendir(path)))
bb_perror_msg_and_die("No %s",path);
for(;;) {
for (;;) {
struct dirent *entry = readdir(dir);
if(!entry) break;
if (!entry) break;
/* Skip "." and ".." (also skips hidden files, which is ok) */
@ -103,7 +210,7 @@ void find_dev(char *path)
int mdev_main(int argc, char *argv[])
{
if (argc > 1) {
if(argc == 2 && !strcmp(argv[1],"-s")) {
if (argc == 2 && !strcmp(argv[1],"-s")) {
RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
strcpy(temp,"/sys/block");
find_dev(temp);