#define root_major (G.root_major)
#define root_minor (G.root_minor)
-#define MAX_SYSFS_DEPTH 3 /* prevent infinite loops in /sys symlinks */
+/* Prevent infinite loops in /sys symlinks */
+#define MAX_SYSFS_DEPTH 3
/* We use additional 64+ bytes in make_device() */
#define SCRATCH_SIZE 80
-static char *next_field(char *s)
+#if ENABLE_FEATURE_MDEV_RENAME
+/* Builds an alias path.
+ * This function potentionally reallocates the alias parameter.
+ */
+static char *build_alias(char *alias, const char *device_name)
{
- char *end = skip_non_whitespace(s);
- s = skip_whitespace(end);
- *end = '\0';
- if (*s == '\0')
- s = NULL;
- return s;
+ char *dest;
+
+ /* ">bar/": rename to bar/device_name */
+ /* ">bar[/]baz": rename to bar[/]baz */
+ dest = strrchr(alias, '/');
+ if (dest) { /* ">bar/[baz]" ? */
+ *dest = '\0'; /* mkdir bar */
+ bb_make_directory(alias, 0755, FILEUTILS_RECUR);
+ *dest = '/';
+ if (dest[1] == '\0') { /* ">bar/" => ">bar/device_name" */
+ dest = alias;
+ alias = concat_path_file(alias, device_name);
+ free(dest);
+ }
+ }
+
+ return alias;
}
+#endif
/* mknod in /dev based on a path like "/sys/block/hda/hda1" */
/* NB: "mdev -s" may call us many times, do not leak memory/fds! */
const char *device_name;
int major, minor, type, len;
int mode = 0660;
- uid_t uid = 0;
- gid_t gid = 0;
- char *dev_maj_min = path + strlen(path);
+#if ENABLE_FEATURE_MDEV_CONF
+ struct bb_uidgid_t ugid = { 0, 0 };
+ parser_t *parser;
+ char *tokens[5];
+#endif
+#if ENABLE_FEATURE_MDEV_EXEC
char *command = NULL;
+#endif
+#if ENABLE_FEATURE_MDEV_RENAME
char *alias = NULL;
+ char aliaslink = aliaslink; /* for compiler */
+#endif
+ char *dev_maj_min = path + strlen(path);
/* Force the configuration file settings exactly. */
umask(0);
/* 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.
+ * because sscanf() will stop at the first nondigit, which \n is.
+ * We also depend on path having writeable space after it.
*/
+ major = -1;
if (!delete) {
strcpy(dev_maj_min, "/dev");
len = open_read_close(path, dev_maj_min + 1, 64);
return;
/* no "dev" file, so just try to run script */
*dev_maj_min = '\0';
+ } else if (sscanf(dev_maj_min, "%u:%u", &major, &minor) != 2) {
+ major = -1;
}
}
/* Determine device name, type, major and minor */
device_name = bb_basename(path);
/* http://kernel.org/doc/pending/hotplug.txt says that only
- * "/sys/block/..." is for block devices. "sys/bus" etc is not! */
- type = (strncmp(&path[5], "block/", 6) == 0 ? S_IFBLK : S_IFCHR);
-
- if (ENABLE_FEATURE_MDEV_CONF) {
- FILE *fp;
- char *line, *val, *next;
- unsigned lineno = 0;
-
- /* If we have config file, look up user settings */
- fp = fopen_or_warn("/etc/mdev.conf", "r");
- if (!fp)
- goto end_parse;
-
- while ((line = xmalloc_fgetline(fp)) != NULL) {
- ++lineno;
- trim(line);
- if (!line[0])
- goto next_line;
-
- /* Fields: regex uid:gid mode [alias] [cmd] */
-
- /* 1st field: regex to match this device */
- next = next_field(line);
- {
- regex_t match;
- regmatch_t off;
- int result;
-
- /* Is this it? */
- xregcomp(&match, line, 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 next_line;
+ * "/sys/block/..." is for block devices. "/sys/bus" etc is not.
+ * But since 2.6.25 block devices are also in /sys/class/block.
+ * We use strstr("/block/") to forestall future surprises. */
+ type = S_IFCHR;
+ if (strstr(path, "/block/"))
+ type = S_IFBLK;
+
+#if ENABLE_FEATURE_MDEV_CONF
+ 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)) {
+ regmatch_t off[1 + 9*ENABLE_FEATURE_MDEV_RENAME_REGEXP];
+ char *val;
+
+ /* Fields: regex uid:gid mode [alias] [cmd] */
+
+ /* 1st field: @<numeric maj,min>... */
+ if (tokens[0][0] == '@') {
+ /* @major,minor[-last] */
+ /* (useful when name is ambiguous:
+ * "/sys/class/usb/lp0" and
+ * "/sys/class/printer/lp0") */
+ int cmaj, cmin0, cmin1, sc;
+ if (major < 0)
+ continue; /* no dev, no match */
+ sc = sscanf(tokens[0], "@%u,%u-%u", &cmaj, &cmin0, &cmin1);
+ if (sc < 1 || major != cmaj
+ || (sc == 2 && minor != cmin0)
+ || (sc == 3 && (minor < cmin0 || minor > cmin1))
+ ) {
+ continue; /* no match */
}
-
- /* This line matches: stop parsing the file
- * after parsing the rest of fields */
-
- /* 2nd field: uid:gid - device ownership */
- if (!next) /* field must exist */
- bb_error_msg_and_die("bad line %u", lineno);
- val = next;
- next = next_field(val);
- {
- struct passwd *pass;
- struct group *grp;
- char *str_uid = val;
- char *str_gid = strchrnul(val, ':');
-
- if (*str_gid)
- *str_gid++ = '\0';
- /* Parse UID */
- pass = getpwnam(str_uid);
- if (pass)
- uid = pass->pw_uid;
- else
- uid = strtoul(str_uid, NULL, 10);
- /* Parse GID */
- grp = getgrnam(str_gid);
- if (grp)
- gid = grp->gr_gid;
- else
- gid = strtoul(str_gid, NULL, 10);
+ } else { /* ... or regex to match device name */
+ regex_t match;
+ int result;
+
+ /* Is this it? */
+ xregcomp(&match, tokens[0], REG_EXTENDED);
+ result = regexec(&match, device_name, ARRAY_SIZE(off), off, 0);
+ regfree(&match);
+
+ //bb_error_msg("matches:");
+ //for (int i = 0; i < ARRAY_SIZE(off); i++) {
+ // if (off[i].rm_so < 0) continue;
+ // bb_error_msg("match %d: '%.*s'\n", i,
+ // (int)(off[i].rm_eo - off[i].rm_so),
+ // device_name + off[i].rm_so);
+ //}
+
+ /* If not this device, skip rest of line */
+ /* (regexec returns whole pattern as "range" 0) */
+ if (result || off[0].rm_so
+ || ((int)off[0].rm_eo != (int)strlen(device_name))
+ ) {
+ continue;
}
+ }
- /* 3rd field: mode - device permissions */
- if (!next) /* field must exist */
- bb_error_msg_and_die("bad line %u", lineno);
- val = next;
- next = next_field(val);
- mode = strtoul(val, NULL, 8);
-
- /* 4th field (opt): >alias */
- if (ENABLE_FEATURE_MDEV_RENAME) {
- if (!next)
- break;
- val = next;
- next = next_field(val);
- if (*val == '>') {
- alias = xstrdup(val + 1);
+ /* This line matches: stop parsing the file
+ * after parsing the rest of fields */
+
+ /* 2nd field: uid:gid - device ownership */
+ parse_chown_usergroup_or_die(&ugid, tokens[1]);
+
+ /* 3rd field: mode - device permissions */
+ mode = strtoul(tokens[2], NULL, 8);
+
+ val = tokens[3];
+ /* 4th field (opt): >alias */
+#if ENABLE_FEATURE_MDEV_RENAME
+ if (!val)
+ break;
+ aliaslink = *val;
+ if (aliaslink == '>' || aliaslink == '=') {
+ char *s;
+#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
+ char *p;
+ unsigned i, n;
+#endif
+ char *a = val;
+ s = strchr(val, ' ');
+ val = (s && s[1]) ? s+1 : NULL;
+#if ENABLE_FEATURE_MDEV_RENAME_REGEXP
+ /* substitute %1..9 with off[1..9], if any */
+ n = 0;
+ s = a;
+ while (*s)
+ if (*s++ == '%')
+ n++;
+
+ p = alias = xzalloc(strlen(a) + n * strlen(device_name));
+ s = a + 1;
+ while (*s) {
+ *p = *s;
+ if ('%' == *s) {
+ i = (s[1] - '0');
+ if (i <= 9 && off[i].rm_so >= 0) {
+ n = off[i].rm_eo - off[i].rm_so;
+ strncpy(p, device_name + off[i].rm_so, n);
+ p += n - 1;
+ s++;
+ }
}
+ p++;
+ s++;
}
-
- /* The rest (opt): command to run */
- if (!next)
- break;
- val = next;
- if (ENABLE_FEATURE_MDEV_EXEC) {
- const char *s = "@$*";
- const char *s2 = strchr(s, *val);
-
- if (!s2)
- bb_error_msg_and_die("bad line %u", lineno);
-
- /* Correlate the position in the "@$*" with the delete
- * step so that we get the proper behavior:
- * @cmd: run on create
- * $cmd: run on delete
- * *cmd: run on both
- */
- if ((s2 - s + 1) /*1/2/3*/ & /*1/2*/ (1 + delete)) {
- command = xstrdup(val + 1);
- }
+#else
+ alias = xstrdup(a + 1);
+#endif
+ }
+#endif /* ENABLE_FEATURE_MDEV_RENAME */
+
+#if ENABLE_FEATURE_MDEV_EXEC
+ /* The rest (opt): command to run */
+ if (!val)
+ break;
+ {
+ const char *s = "@$*";
+ const char *s2 = strchr(s, *val);
+
+ if (!s2)
+ bb_error_msg_and_die("bad line %u", parser->lineno);
+
+ /* Correlate the position in the "@$*" with the delete
+ * step so that we get the proper behavior:
+ * @cmd: run on create
+ * $cmd: run on delete
+ * *cmd: run on both
+ */
+ if ((s2 - s + 1) /*1/2/3*/ & /*1/2*/ (1 + delete)) {
+ command = xstrdup(val + 1);
}
- /* end of field parsing */
- break; /* we found matching line, stop */
- next_line:
- free(line);
- } /* end of "while line is read from /etc/mdev.conf" */
-
- free(line); /* in case we used "break" to get here */
- fclose(fp);
- }
- end_parse:
+ }
+#endif
+ /* end of field parsing */
+ break; /* we found matching line, stop */
+ } /* end of "while line is read from /etc/mdev.conf" */
- if (!delete && sscanf(dev_maj_min, "%u:%u", &major, &minor) == 2) {
+ config_close(parser);
+#endif /* ENABLE_FEATURE_MDEV_CONF */
+
+ if (!delete && major >= 0) {
if (ENABLE_FEATURE_MDEV_RENAME)
unlink(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_RENAME && alias) {
- char *dest;
-
- /* ">bar/": rename to bar/device_name */
- /* ">bar[/]baz": rename to bar[/]baz */
- dest = strrchr(alias, '/');
- if (dest) { /* ">bar/[baz]" ? */
- *dest = '\0'; /* mkdir bar */
- bb_make_directory(alias, 0755, FILEUTILS_RECUR);
- *dest = '/';
- if (dest[1] == '\0') { /* ">bar/" => ">bar/device_name" */
- dest = alias;
- alias = concat_path_file(alias, device_name);
- free(dest);
- }
- }
+#if ENABLE_FEATURE_MDEV_CONF
+ chown(device_name, ugid.uid, ugid.gid);
- /* recreate device_name as a symlink to moved device node */
- if (rename(device_name, alias) == 0) {
- symlink(alias, device_name);
- }
+#if ENABLE_FEATURE_MDEV_RENAME
+ if (alias) {
+ alias = build_alias(alias, device_name);
- free(alias);
- }
+ /* 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 && command) {
+#if ENABLE_FEATURE_MDEV_EXEC
+ if (command) {
/* setenv will leak memory, use putenv/unsetenv/free */
char *s = xasprintf("MDEV=%s", device_name);
putenv(s);
free(s);
free(command);
}
+#endif
- if (delete)
+ 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);
+ }
+#endif
+ }
}
/* File callback for /sys/ traversal */
-static int fileAction(const char *fileName,
- struct stat *statbuf ATTRIBUTE_UNUSED,
- void *userData,
- int depth ATTRIBUTE_UNUSED)
+static int FAST_FUNC fileAction(const char *fileName,
+ struct stat *statbuf UNUSED_PARAM,
+ void *userData,
+ int depth UNUSED_PARAM)
{
size_t len = strlen(fileName) - 4; /* can't underflow */
char *scratch = userData;
/* len check is for paranoid reasons */
- if (strcmp(fileName + len, "/dev") || len >= PATH_MAX)
+ if (strcmp(fileName + len, "/dev") != 0 || len >= PATH_MAX)
return FALSE;
strcpy(scratch, fileName);
}
/* Directory callback for /sys/ traversal */
-static int dirAction(const char *fileName ATTRIBUTE_UNUSED,
- struct stat *statbuf ATTRIBUTE_UNUSED,
- void *userData ATTRIBUTE_UNUSED,
- int depth)
+static int FAST_FUNC dirAction(const char *fileName UNUSED_PARAM,
+ struct stat *statbuf UNUSED_PARAM,
+ void *userData UNUSED_PARAM,
+ int depth)
{
return (depth >= MAX_SYSFS_DEPTH ? SKIP : TRUE);
}
}
int mdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int mdev_main(int argc, char **argv)
+int mdev_main(int argc UNUSED_PARAM, char **argv)
{
- char *action;
- char *env_path;
RESERVE_CONFIG_BUFFER(temp, PATH_MAX + SCRATCH_SIZE);
+ /* We can be called as hotplug helper */
+ /* Kernel cannot provide suitable stdio fds for us, do it ourself */
+#if 1
+ bb_sanitize_stdio();
+#else
+ /* Debug code */
+ /* Replace LOGFILE by other file or device name if you need */
+#define LOGFILE "/dev/console"
+ /* Just making sure fd 0 is not closed,
+ * we don't really intend to read from it */
+ xmove_fd(xopen("/", O_RDONLY), STDIN_FILENO);
+ xmove_fd(xopen(LOGFILE, O_WRONLY|O_APPEND), STDOUT_FILENO);
+ xmove_fd(xopen(LOGFILE, O_WRONLY|O_APPEND), STDERR_FILENO);
+#endif
+
xchdir("/dev");
- if (argc == 2 && !strcmp(argv[1], "-s")) {
+ if (argv[1] && !strcmp(argv[1], "-s")) {
/* Scan:
* mdev -s
*/
root_major = major(st.st_dev);
root_minor = minor(st.st_dev);
+ /* ACTION_FOLLOWLINKS is needed since in newer kernels
+ * /sys/block/loop* (for example) are symlinks to dirs,
+ * not real directories.
+ * (kernel's CONFIG_SYSFS_DEPRECATED makes them real dirs,
+ * but we can't enforce that on users) */
recursive_action("/sys/block",
ACTION_RECURSE | ACTION_FOLLOWLINKS,
fileAction, dirAction, temp, 0);
-
recursive_action("/sys/class",
ACTION_RECURSE | ACTION_FOLLOWLINKS,
fileAction, dirAction, temp, 0);
-
} else {
+ char *seq;
+ char *action;
+ char *env_path;
+ char seqbuf[sizeof(int)*3 + 2];
+ int seqlen = seqlen; /* for compiler */
+
/* Hotplug:
- * env ACTION=... DEVPATH=... mdev
+ * env ACTION=... DEVPATH=... [SEQNUM=...] mdev
* ACTION can be "add" or "remove"
* DEVPATH is like "/block/sda" or "/class/input/mice"
*/
if (!action || !env_path)
bb_show_usage();
+ seq = getenv("SEQNUM");
+ if (seq) {
+ int timeout = 2000 / 32;
+ do {
+ seqlen = open_read_close("mdev.seq", seqbuf, sizeof(seqbuf-1));
+ if (seqlen < 0)
+ break;
+ seqbuf[seqlen] = '\0';
+ if (seqbuf[0] == '\n' /* seed file? */
+ || strcmp(seq, seqbuf) == 0 /* correct idx? */
+ ) {
+ break;
+ }
+ usleep(32*1000);
+ } while (--timeout);
+ }
+
snprintf(temp, PATH_MAX, "/sys%s", env_path);
if (!strcmp(action, "remove"))
make_device(temp, 1);
load_firmware(fw, temp);
}
}
+
+ if (seq && seqlen >= 0) {
+ xopen_xwrite_close("mdev.seq", utoa(xatou(seq) + 1));
+ }
}
if (ENABLE_FEATURE_CLEAN_UP)
projects / oweals / busybox.git / blobdiff