-/* vi:set ts=4:
+/* vi: set sw=4 ts=4: */
+/*
*
* mdev - Mini udev for busybox
*
* Copyright 2005 Rob Landley <rob@landley.net>
* Copyright 2005 Frank Sorenson <frank@tuxrocks.com>
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPL version 2, 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/sysmacros.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <stdlib.h>
#include "busybox.h"
#include "xregex.h"
#define DEV_PATH "/dev"
-#define MDEV_CONF "/etc/mdev.conf"
-
-#include <busybox.h>
struct mdev_globals
{
#define bbg mdev_globals
/* mknod in /dev based on a path like "/sys/block/hda/hda1" */
-static void make_device(char *path)
+static void make_device(char *path, int delete)
{
- char *device_name, *s;
- int major, minor, type, len, fd;
+ char *device_name;
+ int major, minor, type, len;
int mode = 0660;
uid_t uid = 0;
gid_t gid = 0;
char *temp = path + strlen(path);
+ char *command = NULL;
/* Try to read major/minor string. Note that the kernel puts \n after
* the data, so we don't need to worry about null terminating the string
* because sscanf() will stop at the first nondigit, which \n is. We
* also depend on path having writeable space after it. */
- strcat(path, "/dev");
- fd = open(path, O_RDONLY);
- len = read(fd, temp + 1, 64);
- *temp++ = 0;
- close(fd);
- if (len < 1) return;
+ if (!delete) {
+ strcat(path, "/dev");
+ len = open_read_close(path, temp + 1, 64);
+ *temp++ = 0;
+ if (len < 1) return;
+ }
/* Determine device name, type, major and minor */
device_name = strrchr(path, '/') + 1;
type = path[5]=='c' ? S_IFCHR : S_IFBLK;
- if (sscanf(temp, "%d:%d", &major, &minor) != 2) return;
/* If we have a config file, look up permissions for this device */
if (ENABLE_FEATURE_MDEV_CONF) {
char *conf, *pos, *end;
+ int line, fd;
/* mmap the config file */
- if (-1 != (fd=open(MDEV_CONF,O_RDONLY))) {
- len = lseek(fd, 0, SEEK_END);
- conf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, 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++)
- ;
+ fd = open("/etc/mdev.conf", O_RDONLY);
+ if (fd < 0)
+ goto end_parse;
+ len = xlseek(fd, 0, SEEK_END);
+ conf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
+ close(fd);
+ if (!conf)
+ goto end_parse;
+
+ 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=0; field < (3 + ENABLE_FEATURE_MDEV_EXEC);
+ field++)
+ {
+ /* Skip whitespace */
+ while (pos<end && isspace(*pos)) pos++;
+ if (pos==end || *pos=='#') break;
+ for (end2=pos;
+ end2<end && !isspace(*end2) && *end2!='#'; end2++)
+ ;
+
+ if (field == 0) {
+ /* Regex to match this device */
+
+ 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))
+ break;
+ }
+ if (field == 1) {
+ /* uid:gid */
+
+ char *s, *s2;
- /* 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;
- else
- goto found_device;
- }
- }
- pos = end2;
+ /* Find : */
+ for (s=pos; s<end2 && *s!=':'; s++)
+ ;
+ if (s == end2) break;
+
+ /* Parse UID */
+ uid = strtoul(pos, &s2, 10);
+ if (s != s2) {
+ struct passwd *pass;
+ pass = getpwnam(strndupa(pos, s-pos));
+ if (!pass) break;
+ 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) break;
+ gid = grp->gr_gid;
}
-end_line:
- /* Did everything parse happily? */
- if (field && field!=3)
- bb_error_msg_and_die("Bad line %d",line);
+ }
+ if (field == 2) {
+ /* mode */
- /* Next line */
- pos = ++end;
+ mode = strtoul(pos, &pos, 8);
+ if (pos != end2) break;
+ }
+ if (ENABLE_FEATURE_MDEV_EXEC && field == 3) {
+ // Command to run
+ const char *s = "@$*";
+ const char *s2;
+ s2 = strchr(s, *pos++);
+ if (!s2) {
+ // Force error
+ field = 1;
+ break;
+ }
+ if ((s2-s+1) & (1<<delete))
+ command = xstrndup(pos, end-pos);
}
-found_device:
- munmap(conf, len);
+
+ pos = end2;
}
- close(fd);
+
+ /* Did everything parse happily? */
+
+ if (field > 2) break;
+ if (field) bb_error_msg_and_die("bad line %d",line);
+
+ /* Next line */
+ pos = ++end;
}
+ munmap(conf, len);
+ end_parse: /* nothing */ ;
}
umask(0);
- if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST)
- bb_perror_msg_and_die("mknod %s failed", device_name);
+ if (!delete) {
+ if (sscanf(temp, "%d:%d", &major, &minor) != 2) return;
+ if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST)
+ bb_perror_msg_and_die("mknod %s", device_name);
- if (major==bbg.root_major && minor==bbg.root_minor)
- symlink(device_name, "root");
-
- if (ENABLE_FEATURE_MDEV_CONF) chown(device_name, uid, gid);
+ if (major == bbg.root_major && minor == bbg.root_minor)
+ symlink(device_name, "root");
+
+ if (ENABLE_FEATURE_MDEV_CONF) chown(device_name, uid, gid);
+ }
+ if (command) {
+ int rc;
+ char *s;
+
+ s = xasprintf("MDEV=%s", device_name);
+ putenv(s);
+ rc = system(command);
+ s[4] = 0;
+ putenv(s);
+ free(s);
+ free(command);
+ if (rc == -1) bb_perror_msg_and_die("cannot run %s", command);
+ }
+ if (delete) unlink(device_name);
}
/* Recursive search of /sys/block or /sys/class. path must be a writeable
size_t len = strlen(path);
struct dirent *entry;
- if ((dir = opendir(path)) == NULL)
+ dir = opendir(path);
+ if (dir == NULL)
return;
while ((entry = readdir(dir)) != NULL) {
/* If there's a dev entry, mknod it */
- if (!strcmp(entry->d_name, "dev")) make_device(path);
+ if (!strcmp(entry->d_name, "dev")) make_device(path, 0);
}
closedir(dir);
}
+int mdev_main(int argc, char *argv[]);
int mdev_main(int argc, char *argv[])
{
char *action;
char *env_path;
RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
- bb_xchdir(DEV_PATH);
+ xchdir(DEV_PATH);
/* Scan */
if (argc == 2 && !strcmp(argv[1],"-s")) {
struct stat st;
- stat("/", &st); // If this fails, we have bigger problems.
- bbg.root_major=major(st.st_dev);
- bbg.root_minor=minor(st.st_dev);
+ xstat("/", &st);
+ bbg.root_major = major(st.st_dev);
+ bbg.root_minor = minor(st.st_dev);
strcpy(temp,"/sys/block");
find_dev(temp);
strcpy(temp,"/sys/class");
} else {
action = getenv("ACTION");
env_path = getenv("DEVPATH");
- if (!action || !env_path)
+ if (!action || !env_path)
bb_show_usage();
- if (!strcmp(action, "add")) {
- sprintf(temp, "/sys%s", env_path);
- make_device(temp);
- } else if (!strcmp(action, "remove")) {
- unlink(strrchr(env_path, '/') + 1);
- }
+ sprintf(temp, "/sys%s", env_path);
+ if (!strcmp(action, "add")) make_device(temp,0);
+ else if (!strcmp(action, "remove")) make_device(temp,1);
}
if (ENABLE_FEATURE_CLEAN_UP) RELEASE_CONFIG_BUFFER(temp);
projects / oweals / busybox.git / blobdiff