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-rw-r--r--util-linux/mdev.c193
1 files changed, 98 insertions, 95 deletions
diff --git a/util-linux/mdev.c b/util-linux/mdev.c
index a9c146942..927adf66f 100644
--- a/util-linux/mdev.c
+++ b/util-linux/mdev.c
@@ -35,154 +35,146 @@ static void make_device(char *path, int delete)
/* 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. */
-
+ * also depend on path having writeable space after it.
+ */
if (!delete) {
strcat(path, "/dev");
len = open_read_close(path, temp + 1, 64);
*temp++ = 0;
- if (len < 1) return;
+ if (len < 1)
+ return;
}
/* Determine device name, type, major and minor */
-
device_name = bb_basename(path);
- type = path[5]=='c' ? S_IFCHR : S_IFBLK;
-
- /* If we have a config file, look up permissions for this device */
+ type = (path[5] == 'c' ? S_IFCHR : S_IFBLK);
if (ENABLE_FEATURE_MDEV_CONF) {
- char *conf, *pos, *end;
- int line, fd;
+ FILE *fp;
+ char *line, *vline;
+ size_t lineno = 0;
- /* mmap the config file */
- 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)
+ /* If we have a config file, look up the user settings */
+ fp = fopen_or_warn("/etc/mdev.conf", "r");
+ if (!fp)
goto end_parse;
- line = 0;
- /* Loop through lines in mmaped file*/
- for (pos=conf; pos-conf<len;) {
+ while ((vline = line = xmalloc_getline(fp)) != NULL) {
int field;
- char *end2;
- line++;
- /* find end of this line */
- for (end=pos; end-conf<len && *end!='\n'; end++)
- ;
+ /* A pristine copy for command execution. */
+ char *orig_line;
+ if (ENABLE_FEATURE_MDEV_EXEC)
+ orig_line = xstrdup(line);
+
+ ++lineno;
/* 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++)
- ;
+ for (field = 0; field < (3 + ENABLE_FEATURE_MDEV_EXEC); ++field) {
+
+ /* Find a non-empty field */
+ char *val;
+ do {
+ val = strtok(vline, " \t");
+ vline = NULL;
+ } while (val && !*val);
+ if (!val)
+ break;
if (field == 0) {
- /* Regex to match this device */
- char *regex = xstrndup(pos, end2-pos);
+ /* Regex to match this device */
regex_t match;
regmatch_t off;
int result;
/* Is this it? */
- xregcomp(&match,regex, REG_EXTENDED);
+ xregcomp(&match, val, REG_EXTENDED);
result = regexec(&match, device_name, 1, &off, 0);
regfree(&match);
- free(regex);
/* 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 */
+ if (result || off.rm_so || off.rm_eo != strlen(device_name))
+ goto next_line;
- char *s, *s2;
+ } else if (field == 1) {
- /* Find : */
- for (s=pos; s<end2 && *s!=':'; s++)
- ;
- if (s == end2) break;
+ /* uid:gid device ownership */
+ struct passwd *pass;
+ struct group *grp;
+
+ char *str_uid = val;
+ char *str_gid = strchr(val, ':');
+ if (str_gid)
+ *str_gid = '\0', ++str_gid;
/* Parse UID */
- uid = strtoul(pos, &s2, 10);
- if (s != s2) {
- struct passwd *pass;
- char *_unam = xstrndup(pos, s-pos);
- pass = getpwnam(_unam);
- free(_unam);
- if (!pass) break;
+ pass = getpwnam(str_uid);
+ if (pass)
uid = pass->pw_uid;
- }
- s++;
+ else
+ uid = strtoul(str_uid, NULL, 10);
+
/* parse GID */
- gid = strtoul(s, &s2, 10);
- if (end2 != s2) {
- struct group *grp;
- char *_grnam = xstrndup(s, end2-s);
- grp = getgrnam(_grnam);
- free(_grnam);
- if (!grp) break;
+ grp = getgrnam(str_gid);
+ if (grp)
gid = grp->gr_gid;
- }
- }
- if (field == 2) {
- /* mode */
+ else
+ gid = strtoul(str_gid, NULL, 10);
- mode = strtoul(pos, &pos, 8);
- if (pos != end2) break;
- }
- if (ENABLE_FEATURE_MDEV_EXEC && field == 3) {
- // Command to run
+ } else if (field == 2) {
+
+ /* Mode device permissions */
+ mode = strtoul(val, NULL, 8);
+
+ } else if (ENABLE_FEATURE_MDEV_EXEC && field == 3) {
+
+ /* Optional command to run */
const char *s = "@$*";
- const char *s2;
- s2 = strchr(s, *pos++);
+ const char *s2 = strchr(s, *val);
+
if (!s2) {
- // Force error
+ /* Force error */
field = 1;
break;
}
- if ((s2-s+1) & (1<<delete))
- command = xstrndup(pos, end-pos);
- }
- pos = end2;
+ /* Correlate the position in the "@$*" with the delete
+ * step so that we get the proper behavior.
+ */
+ if ((s2 - s + 1) & (1 << delete))
+ command = xstrdup(orig_line + (val + 1 - line));
+ }
}
/* Did everything parse happily? */
+ if (field <= 2)
+ bb_error_msg_and_die("bad line %i", lineno);
- if (field > 2) break;
- if (field) bb_error_msg_and_die("bad line %d",line);
-
- /* Next line */
- pos = ++end;
+ next_line:
+ free(line);
+ if (ENABLE_FEATURE_MDEV_EXEC)
+ free(orig_line);
}
- munmap(conf, len);
+
+ if (ENABLE_FEATURE_CLEAN_UP)
+ fclose(fp);
+
end_parse: /* nothing */ ;
}
umask(0);
if (!delete) {
- if (sscanf(temp, "%d:%d", &major, &minor) != 2) return;
+ 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 == root_major && minor == root_minor)
symlink(device_name, "root");
- if (ENABLE_FEATURE_MDEV_CONF) chown(device_name, uid, gid);
+ if (ENABLE_FEATURE_MDEV_CONF)
+ chown(device_name, uid, gid);
}
if (command) {
/* setenv will leak memory, so use putenv */
@@ -195,7 +187,8 @@ static void make_device(char *path, int delete)
free(s);
free(command);
}
- if (delete) unlink(device_name);
+ if (delete)
+ remove_file(device_name, FILEUTILS_FORCE);
}
/* File callback for /sys/ traversal */
@@ -296,9 +289,12 @@ int mdev_main(int argc, char **argv)
xchdir("/dev");
- /* Scan */
-
if (argc == 2 && !strcmp(argv[1],"-s")) {
+
+ /* Scan:
+ * mdev -s
+ */
+
struct stat st;
xstat("/", &st);
@@ -313,9 +309,14 @@ int mdev_main(int argc, char **argv)
ACTION_RECURSE | ACTION_FOLLOWLINKS,
fileAction, dirAction, temp, 0);
- /* Hotplug */
-
} else {
+
+ /* Hotplug:
+ * env ACTION=... DEVPATH=... mdev
+ * ACTION can be "add" or "remove"
+ * DEVPATH is like "/block/sda" or "/class/input/mice"
+ */
+
action = getenv("ACTION");
env_path = getenv("DEVPATH");
if (!action || !env_path)
@@ -332,6 +333,8 @@ int mdev_main(int argc, char **argv)
}
}
- if (ENABLE_FEATURE_CLEAN_UP) RELEASE_CONFIG_BUFFER(temp);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ RELEASE_CONFIG_BUFFER(temp);
+
return 0;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 06:01:40 +0000