2006-07-02 19:47:05 +00:00
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/* vi: set sw=4 ts=4: */
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/*
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2006-01-25 00:08:53 +00:00
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*
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2005-12-13 08:21:33 +00:00
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* mdev - Mini udev for busybox
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2006-01-25 00:08:53 +00:00
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*
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2005-12-13 08:21:33 +00:00
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* Copyright 2005 Rob Landley <rob@landley.net>
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* Copyright 2005 Frank Sorenson <frank@tuxrocks.com>
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*
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2006-09-22 02:52:41 +00:00
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* Licensed under GPL version 2, see file LICENSE in this tarball for details.
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2005-12-13 08:21:33 +00:00
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*/
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2006-06-26 14:11:33 +00:00
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#include "busybox.h"
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2005-12-17 10:52:30 +00:00
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#include "xregex.h"
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2005-12-13 08:21:33 +00:00
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2005-12-17 10:54:17 +00:00
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#define DEV_PATH "/dev"
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2005-12-13 08:21:33 +00:00
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2006-05-21 18:33:27 +00:00
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struct mdev_globals
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{
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int root_major, root_minor;
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} mdev_globals;
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#define bbg mdev_globals
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2006-02-21 06:11:13 +00:00
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2005-12-13 08:21:33 +00:00
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/* mknod in /dev based on a path like "/sys/block/hda/hda1" */
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2006-06-26 14:11:33 +00:00
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static void make_device(char *path, int delete)
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2005-12-13 08:21:33 +00:00
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{
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2006-06-26 14:11:33 +00:00
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char *device_name;
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2006-10-16 19:39:37 +00:00
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int major, minor, type, len;
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2006-02-03 00:25:37 +00:00
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int mode = 0660;
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uid_t uid = 0;
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gid_t gid = 0;
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2006-05-08 02:53:23 +00:00
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char *temp = path + strlen(path);
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2006-06-26 14:11:33 +00:00
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char *command = NULL;
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2005-12-13 08:21:33 +00:00
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2006-05-08 02:53:23 +00:00
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/* Try to read major/minor string. Note that the kernel puts \n after
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* the data, so we don't need to worry about null terminating the string
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* because sscanf() will stop at the first nondigit, which \n is. We
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* also depend on path having writeable space after it. */
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2005-12-13 08:21:33 +00:00
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2006-08-10 01:09:37 +00:00
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if (!delete) {
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strcat(path, "/dev");
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2006-10-14 02:23:43 +00:00
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len = open_read_close(path, temp + 1, 64);
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2006-08-10 01:09:37 +00:00
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*temp++ = 0;
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if (len < 1) return;
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}
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2006-01-25 00:08:53 +00:00
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2005-12-13 08:21:33 +00:00
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/* Determine device name, type, major and minor */
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2006-01-25 00:08:53 +00:00
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2005-12-13 08:21:33 +00:00
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device_name = strrchr(path, '/') + 1;
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2006-05-08 02:53:23 +00:00
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type = path[5]=='c' ? S_IFCHR : S_IFBLK;
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2005-12-13 08:21:33 +00:00
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2005-12-17 10:52:30 +00:00
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/* If we have a config file, look up permissions for this device */
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2006-01-25 00:08:53 +00:00
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2005-12-17 10:52:30 +00:00
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if (ENABLE_FEATURE_MDEV_CONF) {
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2006-02-03 00:25:37 +00:00
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char *conf, *pos, *end;
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2006-10-16 19:39:37 +00:00
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int line, fd;
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2005-12-17 10:52:30 +00:00
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/* mmap the config file */
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2006-10-16 19:39:37 +00:00
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fd = open("/etc/mdev.conf", O_RDONLY);
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if (fd < 0)
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goto end_parse;
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len = xlseek(fd, 0, SEEK_END);
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conf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
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close(fd);
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if (!conf)
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goto end_parse;
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line = 0;
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/* Loop through lines in mmaped file*/
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for (pos=conf; pos-conf<len;) {
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int field;
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char *end2;
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line++;
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/* find end of this line */
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2006-11-26 15:45:17 +00:00
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for (end=pos; end-conf<len && *end!='\n'; end++)
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2006-10-16 19:39:37 +00:00
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;
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/* Three fields: regex, uid:gid, mode */
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for (field=0; field < (3 + ENABLE_FEATURE_MDEV_EXEC);
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field++)
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{
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/* Skip whitespace */
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while (pos<end && isspace(*pos)) pos++;
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if (pos==end || *pos=='#') break;
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for (end2=pos;
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end2<end && !isspace(*end2) && *end2!='#'; end2++)
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;
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if (field == 0) {
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/* Regex to match this device */
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char *regex = strndupa(pos, end2-pos);
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regex_t match;
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regmatch_t off;
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int result;
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/* Is this it? */
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xregcomp(&match,regex, REG_EXTENDED);
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result = regexec(&match, device_name, 1, &off, 0);
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regfree(&match);
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/* If not this device, skip rest of line */
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if (result || off.rm_so
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|| off.rm_eo != strlen(device_name))
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break;
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}
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if (field == 1) {
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/* uid:gid */
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char *s, *s2;
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/* Find : */
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2006-11-26 15:45:17 +00:00
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for (s=pos; s<end2 && *s!=':'; s++)
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2006-02-03 00:25:37 +00:00
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;
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2006-10-16 19:39:37 +00:00
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if (s == end2) break;
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/* Parse UID */
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uid = strtoul(pos, &s2, 10);
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if (s != s2) {
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struct passwd *pass;
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pass = getpwnam(strndupa(pos, s-pos));
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if (!pass) break;
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uid = pass->pw_uid;
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}
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s++;
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/* parse GID */
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gid = strtoul(s, &s2, 10);
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if (end2 != s2) {
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struct group *grp;
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grp = getgrnam(strndupa(s, end2-s));
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if (!grp) break;
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gid = grp->gr_gid;
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}
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}
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if (field == 2) {
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/* mode */
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2005-12-17 10:52:30 +00:00
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2006-10-16 19:39:37 +00:00
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mode = strtoul(pos, &pos, 8);
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if (pos != end2) break;
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}
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if (ENABLE_FEATURE_MDEV_EXEC && field == 3) {
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// Command to run
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char *s = "@$*", *s2;
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s2 = strchr(s, *pos++);
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if (!s2) {
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// Force error
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field = 1;
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break;
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2005-12-17 10:52:30 +00:00
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}
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2006-10-16 19:39:37 +00:00
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if ((s2-s+1) & (1<<delete))
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command = xstrndup(pos, end-pos);
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}
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pos = end2;
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}
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2006-06-26 14:11:33 +00:00
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2006-10-16 19:39:37 +00:00
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/* Did everything parse happily? */
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2006-06-26 14:11:33 +00:00
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2006-10-16 19:39:37 +00:00
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if (field > 2) break;
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if (field) bb_error_msg_and_die("bad line %d",line);
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2005-12-17 10:52:30 +00:00
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2006-10-16 19:39:37 +00:00
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/* Next line */
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pos = ++end;
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2005-12-17 10:52:30 +00:00
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}
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2006-10-16 19:39:37 +00:00
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munmap(conf, len);
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end_parse: /* nothing */ ;
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2005-12-17 10:52:30 +00:00
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}
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2005-12-13 08:21:33 +00:00
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2005-12-17 10:52:30 +00:00
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umask(0);
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2006-06-26 14:11:33 +00:00
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if (!delete) {
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2006-08-10 01:09:37 +00:00
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if (sscanf(temp, "%d:%d", &major, &minor) != 2) return;
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2006-06-26 14:11:33 +00:00
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if (mknod(device_name, mode | type, makedev(major, minor)) && errno != EEXIST)
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2006-10-16 19:39:37 +00:00
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bb_perror_msg_and_die("mknod %s", device_name);
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2005-12-13 08:21:33 +00:00
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2006-06-26 14:11:33 +00:00
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if (major == bbg.root_major && minor == bbg.root_minor)
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symlink(device_name, "root");
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2006-09-17 16:28:10 +00:00
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2006-06-26 14:11:33 +00:00
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if (ENABLE_FEATURE_MDEV_CONF) chown(device_name, uid, gid);
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}
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if (command) {
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int rc;
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char *s;
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2006-09-17 16:28:10 +00:00
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2006-10-16 19:39:37 +00:00
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s = xasprintf("MDEV=%s", device_name);
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2006-06-26 14:11:33 +00:00
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putenv(s);
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rc = system(command);
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2006-10-16 19:39:37 +00:00
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s[4] = 0;
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2006-06-26 14:11:33 +00:00
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putenv(s);
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free(s);
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free(command);
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2006-09-29 21:30:43 +00:00
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if (rc == -1) bb_perror_msg_and_die("cannot run %s", command);
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2006-06-26 14:11:33 +00:00
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}
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if (delete) unlink(device_name);
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2005-12-13 08:21:33 +00:00
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}
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/* Recursive search of /sys/block or /sys/class. path must be a writeable
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* buffer of size PATH_MAX containing the directory string to start at. */
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2005-12-17 10:52:30 +00:00
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static void find_dev(char *path)
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2005-12-13 08:21:33 +00:00
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{
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DIR *dir;
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2006-02-03 00:25:37 +00:00
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size_t len = strlen(path);
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2006-02-03 00:19:42 +00:00
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struct dirent *entry;
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2005-12-13 08:21:33 +00:00
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2006-10-16 19:39:37 +00:00
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dir = opendir(path);
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if (dir == NULL)
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2006-02-03 00:19:42 +00:00
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return;
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2005-12-13 08:21:33 +00:00
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2006-02-03 00:19:42 +00:00
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while ((entry = readdir(dir)) != NULL) {
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2006-06-13 18:27:16 +00:00
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struct stat st;
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2005-12-13 08:21:33 +00:00
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/* Skip "." and ".." (also skips hidden files, which is ok) */
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2006-02-03 00:25:37 +00:00
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if (entry->d_name[0] == '.')
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continue;
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2005-12-13 08:21:33 +00:00
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2006-06-13 18:27:16 +00:00
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// uClibc doesn't fill out entry->d_type reliably. so we use lstat().
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snprintf(path+len, PATH_MAX-len, "/%s", entry->d_name);
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if (!lstat(path, &st) && S_ISDIR(st.st_mode)) find_dev(path);
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path[len] = 0;
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2006-01-25 00:08:53 +00:00
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2005-12-13 08:21:33 +00:00
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/* If there's a dev entry, mknod it */
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2006-01-25 00:08:53 +00:00
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2006-06-26 14:11:33 +00:00
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if (!strcmp(entry->d_name, "dev")) make_device(path, 0);
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2005-12-13 08:21:33 +00:00
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}
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2006-01-25 00:08:53 +00:00
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2005-12-13 08:21:33 +00:00
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closedir(dir);
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}
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int mdev_main(int argc, char *argv[])
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{
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2006-01-12 06:13:50 +00:00
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char *action;
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char *env_path;
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RESERVE_CONFIG_BUFFER(temp,PATH_MAX);
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2006-08-03 15:41:12 +00:00
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xchdir(DEV_PATH);
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2006-05-08 02:53:23 +00:00
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2006-01-12 06:13:50 +00:00
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/* Scan */
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2006-01-25 00:08:53 +00:00
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2006-01-12 06:13:50 +00:00
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if (argc == 2 && !strcmp(argv[1],"-s")) {
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2006-02-21 06:11:13 +00:00
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struct stat st;
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2006-10-16 19:39:37 +00:00
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xstat("/", &st);
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bbg.root_major = major(st.st_dev);
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bbg.root_minor = minor(st.st_dev);
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2006-01-12 06:13:50 +00:00
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strcpy(temp,"/sys/block");
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find_dev(temp);
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strcpy(temp,"/sys/class");
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find_dev(temp);
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/* Hotplug */
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} else {
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action = getenv("ACTION");
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env_path = getenv("DEVPATH");
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2006-10-03 19:56:34 +00:00
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if (!action || !env_path)
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2006-02-03 00:25:37 +00:00
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bb_show_usage();
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2006-01-25 00:08:53 +00:00
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2006-06-26 14:11:33 +00:00
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sprintf(temp, "/sys%s", env_path);
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if (!strcmp(action, "add")) make_device(temp,0);
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else if (!strcmp(action, "remove")) make_device(temp,1);
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2006-01-12 06:13:50 +00:00
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}
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2006-02-03 00:25:37 +00:00
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if (ENABLE_FEATURE_CLEAN_UP) RELEASE_CONFIG_BUFFER(temp);
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2005-12-13 08:21:33 +00:00
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return 0;
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}
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