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-rw-r--r--include/usage.h2
-rw-r--r--util-linux/mdev.c179
2 files changed, 98 insertions, 83 deletions
diff --git a/include/usage.h b/include/usage.h
index 7111e90bc..d3bf7849e 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -2560,7 +2560,7 @@
" echo /bin/mdev >/proc/sys/kernel/hotplug\n" \
USE_FEATURE_MDEV_CONF( \
"It uses /etc/mdev.conf with lines\n" \
- "DEVNAME UID:GID PERM" \
+ "[-]DEVNAME UID:GID PERM" \
USE_FEATURE_MDEV_RENAME(" [>|=PATH]") \
USE_FEATURE_MDEV_EXEC(" [@|$|*COMMAND]") \
) \
diff --git a/util-linux/mdev.c b/util-linux/mdev.c
index 3b0ef351e..b1f3d051c 100644
--- a/util-linux/mdev.c
+++ b/util-linux/mdev.c
@@ -57,21 +57,12 @@ static char *build_alias(char *alias, const char *device_name)
/* NB: "mdev -s" may call us many times, do not leak memory/fds! */
static void make_device(char *path, int delete)
{
- const char *device_name;
- int major, minor, type, len;
- int mode = 0660;
#if ENABLE_FEATURE_MDEV_CONF
- struct bb_uidgid_t ugid = { 0, 0 };
parser_t *parser;
- char *tokens[5];
-# if ENABLE_FEATURE_MDEV_EXEC
- char *command = NULL;
-# endif
-# if ENABLE_FEATURE_MDEV_RENAME
- char *alias = NULL;
- char aliaslink = aliaslink; /* for compiler */
-# endif
#endif
+ const char *device_name;
+ int major, minor, type, len;
+ int mode;
char *dev_maj_min = path + strlen(path);
/* Force the configuration file settings exactly. */
@@ -111,14 +102,37 @@ static void make_device(char *path, int delete)
parser = config_open2("/etc/mdev.conf", fopen_for_read);
/* If we have config file, look up user settings */
- while (config_read(parser, tokens, 4, 3, "# \t", PARSE_NORMAL)) {
+ while (1) {
regmatch_t off[1 + 9*ENABLE_FEATURE_MDEV_RENAME_REGEXP];
- char *val = tokens[0];
+ int keep_matching;
+ char *val;
+ struct bb_uidgid_t ugid;
+ char *tokens[4];
+# if ENABLE_FEATURE_MDEV_EXEC
+ char *command = NULL;
+# endif
+# if ENABLE_FEATURE_MDEV_RENAME
+ char *alias = NULL;
+ char aliaslink = aliaslink; /* for compiler */
+# endif
+ /* Defaults in case we won't match any line */
+ ugid.uid = ugid.gid = 0;
+ keep_matching = 0;
+ mode = 0660;
+
+ if (!config_read(parser, tokens, 4, 3, "# \t", PARSE_NORMAL)) {
+ /* End of file, create dev node with default params */
+ goto line_matches;
+ }
+
+ val = tokens[0];
+ keep_matching = ('-' == val[0]);
+ val += keep_matching; /* swallow leading dash */
/* Fields: regex uid:gid mode [alias] [cmd] */
/* 1st field: @<numeric maj,min>... */
- if (tokens[0][0] == '@') {
+ if (val[0] == '@') {
/* @major,minor[-last] */
/* (useful when name is ambiguous:
* "/sys/class/usb/lp0" and
@@ -126,12 +140,12 @@ static void make_device(char *path, int delete)
int cmaj, cmin0, cmin1, sc;
if (major < 0)
continue; /* no dev, no match */
- sc = sscanf(tokens[0], "@%u,%u-%u", &cmaj, &cmin0, &cmin1);
+ sc = sscanf(val, "@%u,%u-%u", &cmaj, &cmin0, &cmin1);
if (sc < 1 || major != cmaj
|| (sc == 2 && minor != cmin0)
|| (sc == 3 && (minor < cmin0 || minor > cmin1))
) {
- continue; /* no match */
+ continue; /* this line doesn't match */
}
} else { /* ... or regex to match device name */
regex_t match;
@@ -160,12 +174,12 @@ static void make_device(char *path, int delete)
if (result || off[0].rm_so
|| ((int)off[0].rm_eo != (int)strlen(dev_name_or_subsystem))
) {
- continue;
+ continue; /* this line doesn't match */
}
}
- /* This line matches: stop parsing the file
- * after parsing the rest of fields */
+ /* This line matches: stop parsing the file after parsing
+ * the rest of fields unless keep_matching == 1 */
/* 2nd field: uid:gid - device ownership */
parse_chown_usergroup_or_die(&ugid, tokens[1]);
@@ -174,24 +188,25 @@ static void make_device(char *path, int delete)
mode = strtoul(tokens[2], NULL, 8);
val = tokens[3];
- /* 4th field (opt): >alias */
+ /* 4th field (opt): >|=alias */
# if ENABLE_FEATURE_MDEV_RENAME
if (!val)
- break;
- aliaslink = *val;
+ goto line_matches;
+ aliaslink = val[0];
if (aliaslink == '>' || aliaslink == '=') {
- char *s, *st;
+ char *a, *s, *st;
# if ENABLE_FEATURE_MDEV_RENAME_REGEXP
char *p;
unsigned i, n;
# endif
- char *a = val;
+ a = val;
s = strchrnul(val, ' ');
st = strchrnul(val, '\t');
if (st < s)
s = st;
val = (s[0] && s[1]) ? s+1 : NULL;
s[0] = '\0';
+
# if ENABLE_FEATURE_MDEV_RENAME_REGEXP
/* substitute %1..9 with off[1..9], if any */
n = 0;
@@ -223,12 +238,12 @@ static void make_device(char *path, int delete)
# endif /* ENABLE_FEATURE_MDEV_RENAME */
# if ENABLE_FEATURE_MDEV_EXEC
- /* The rest (opt): command to run */
+ /* The rest (opt): @|$|*command */
if (!val)
- break;
+ goto line_matches;
{
const char *s = "@$*";
- const char *s2 = strchr(s, *val);
+ const char *s2 = strchr(s, val[0]);
if (!s2)
bb_error_msg_and_die("bad line %u", parser->lineno);
@@ -244,71 +259,71 @@ static void make_device(char *path, int delete)
}
}
# endif
- /* end of field parsing */
- break; /* we found matching line, stop */
- } /* end of "while line is read from /etc/mdev.conf" */
-
- config_close(parser);
+ /* End of field parsing */
+ line_matches:
#endif /* ENABLE_FEATURE_MDEV_CONF */
- if (!delete && major >= 0) {
-
- if (ENABLE_FEATURE_MDEV_RENAME)
- unlink(device_name);
-
- if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST)
- bb_perror_msg_and_die("mknod %s", device_name);
-
- if (major == root_major && minor == root_minor)
- symlink(device_name, "root");
+ /* "Execute" the line we found */
+ if (!delete && major >= 0) {
+ if (ENABLE_FEATURE_MDEV_RENAME)
+ unlink(device_name);
+ if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST)
+ bb_perror_msg_and_die("mknod %s", device_name);
+ if (major == root_major && minor == root_minor)
+ symlink(device_name, "root");
#if ENABLE_FEATURE_MDEV_CONF
- chown(device_name, ugid.uid, ugid.gid);
-
+ chown(device_name, ugid.uid, ugid.gid);
# if ENABLE_FEATURE_MDEV_RENAME
- if (alias) {
- alias = build_alias(alias, device_name);
-
- /* move the device, and optionally
- * make a symlink to moved device node */
- if (rename(device_name, alias) == 0 && aliaslink == '>')
- symlink(alias, device_name);
-
- free(alias);
- }
+ if (alias) {
+ alias = build_alias(alias, device_name);
+ /* move the device, and optionally
+ * make a symlink to moved device node */
+ if (rename(device_name, alias) == 0 && aliaslink == '>')
+ symlink(alias, device_name);
+ free(alias);
+ }
# endif
#endif
- }
-
+ }
#if ENABLE_FEATURE_MDEV_EXEC
- if (command) {
- /* setenv will leak memory, use putenv/unsetenv/free */
- char *s = xasprintf("%s=%s", "MDEV", device_name);
- char *s1 = xasprintf("%s=%s", "SUBSYSTEM", subsystem);
- putenv(s);
- putenv(s1);
- if (system(command) == -1)
- bb_perror_msg_and_die("can't run '%s'", command);
- unsetenv("SUBSYSTEM");
- free(s1);
- unsetenv("MDEV");
- free(s);
- free(command);
- }
+ if (command) {
+ /* setenv will leak memory, use putenv/unsetenv/free */
+ char *s = xasprintf("%s=%s", "MDEV", device_name);
+ char *s1 = xasprintf("%s=%s", "SUBSYSTEM", subsystem);
+ putenv(s);
+ putenv(s1);
+ if (system(command) == -1)
+ bb_perror_msg_and_die("can't run '%s'", command);
+ unsetenv("SUBSYSTEM");
+ free(s1);
+ unsetenv("MDEV");
+ free(s);
+ free(command);
+ }
#endif
-
- if (delete) {
- unlink(device_name);
- /* At creation time, device might have been moved
- * and a symlink might have been created. Undo that. */
+ if (delete) {
+ unlink(device_name);
+ /* At creation time, device might have been moved
+ * and a symlink might have been created. Undo that. */
#if ENABLE_FEATURE_MDEV_RENAME
- if (alias) {
- alias = build_alias(alias, device_name);
- unlink(alias);
- free(alias);
- }
+ if (alias) {
+ alias = build_alias(alias, device_name);
+ unlink(alias);
+ free(alias);
+ }
#endif
- }
+ }
+
+#if ENABLE_FEATURE_MDEV_CONF
+ /* We found matching line.
+ * Stop unless it was prefixed with '-' */
+ if (!keep_matching)
+ break;
+ } /* end of "while line is read from /etc/mdev.conf" */
+
+ config_close(parser);
+#endif /* ENABLE_FEATURE_MDEV_CONF */
}
/* File callback for /sys/ traversal */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 20:08:08 +0000