Correcting tag name to be like previous ones1_3_0

1 files changed, 268 insertions, 0 deletions

diff --git a/util-linux/mdev.c b/util-linux/mdev.c
new file mode 100644
index 000000000..957316d52
--- /dev/null
+++ b/util-linux/mdev.c
@@ -0,0 +1,268 @@
+/* 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 GPL version 2, see file LICENSE in this tarball for details.
+ */
+
+#include "busybox.h"
+#include "xregex.h"
+
+#define DEV_PATH	"/dev"
+
+struct mdev_globals
+{
+	int root_major, root_minor;
+} mdev_globals;
+
+#define bbg mdev_globals
+
+/* mknod in /dev based on a path like "/sys/block/hda/hda1" */
+static void make_device(char *path, int delete)
+{
+	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. */
+
+	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 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 */
+		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;
+
+					/* 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;
+					}
+				}
+				if (field == 2) {
+					/* mode */
+
+					mode = strtoul(pos, &pos, 8);
+					if (pos != end2) break;
+				}
+				if (ENABLE_FEATURE_MDEV_EXEC && field == 3) {
+					// Command to run
+					char *s = "@$*", *s2;
+					s2 = strchr(s, *pos++);
+					if (!s2) {
+						// Force error
+						field = 1;
+						break;
+					}
+					if ((s2-s+1) & (1<<delete))
+						command = xstrndup(pos, end-pos);
+				}
+
+				pos = end2;
+			}
+
+			/* 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 (!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 (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
+ * buffer of size PATH_MAX containing the directory string to start at. */
+
+static void find_dev(char *path)
+{
+	DIR *dir;
+	size_t len = strlen(path);
+	struct dirent *entry;
+
+	dir = opendir(path);
+	if (dir == NULL)
+		return;
+
+	while ((entry = readdir(dir)) != NULL) {
+		struct stat st;
+
+		/* Skip "." and ".." (also skips hidden files, which is ok) */
+
+		if (entry->d_name[0] == '.')
+			continue;
+
+		// uClibc doesn't fill out entry->d_type reliably. so we use lstat().
+
+		snprintf(path+len, PATH_MAX-len, "/%s", entry->d_name);
+		if (!lstat(path, &st) && S_ISDIR(st.st_mode)) find_dev(path);
+		path[len] = 0;
+
+		/* If there's a dev entry, mknod it */
+
+		if (!strcmp(entry->d_name, "dev")) make_device(path, 0);
+	}
+
+	closedir(dir);
+}
+
+int mdev_main(int argc, char *argv[])
+{
+	char *action;
+	char *env_path;
+	RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
+
+	xchdir(DEV_PATH);
+
+	/* Scan */
+
+	if (argc == 2 && !strcmp(argv[1],"-s")) {
+		struct stat st;
+
+		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");
+		find_dev(temp);
+
+	/* Hotplug */
+
+	} else {
+		action = getenv("ACTION");
+		env_path = getenv("DEVPATH");
+		if (!action || !env_path)
+			bb_show_usage();
+
+		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);
+	return 0;
+}