/* We use additional 64+ bytes in make_device() */
#define SCRATCH_SIZE 80
+#if ENABLE_FEATURE_MDEV_RENAME
/* Builds an alias path.
* This function potentionally reallocates the alias parameter.
*/
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;
}
}
if (strstr(path, "/block/"))
type = S_IFBLK;
- if (ENABLE_FEATURE_MDEV_CONF) {
- parser_t *parser = config_open("/etc/mdev.conf");
- char *tokens[5];
-
- /* If we have config file, look up user settings */
- if (!parser)
- goto end_parse;
-
- while (config_read(parser, tokens, 4, 3, "# \t", PARSE_LAST_IS_GREEDY)) {
- regmatch_t off[1+9*ENABLE_FEATURE_MDEV_RENAME_REGEXP];
- char *val;
-
- /* Fields: regex uid:gid mode [alias] [cmd] */
-
- /* 1st field: regex to match this device */
- {
- 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;
- }
+#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 */
- {
- struct passwd *pass;
- struct group *grp;
- char *str_uid = tokens[1];
- char *str_gid = strchrnul(str_uid, ':');
-
- 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 */
- mode = strtoul(tokens[2], NULL, 8);
+ /* This line matches: stop parsing the file
+ * after parsing the rest of fields */
- val = tokens[3];
- /* 4th field (opt): >alias */
+ /* 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, *p;
- unsigned i, n;
- char *a = val;
- s = strchr(val, ' ');
- val = (s && s[1]) ? s+1 : NULL;
+ 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++;
- }
+ /* 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++;
}
+ p++;
+ s++;
+ }
#else
- alias = xstrdup(a + 1);
+ alias = xstrdup(a + 1);
#endif
- }
+ }
#endif /* ENABLE_FEATURE_MDEV_RENAME */
- /* The rest (opt): command to run */
- if (!val)
- break;
- if (ENABLE_FEATURE_MDEV_EXEC) {
- 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
- * $cmd: run on delete
- * *cmd: run on both
- */
- if ((s2 - s + 1) /*1/2/3*/ & /*1/2*/ (1 + delete)) {
- command = xstrdup(val + 1);
- }
+#if ENABLE_FEATURE_MDEV_EXEC
+ /* The rest (opt): command to run */
+ if (!val)
+ break;
+ {
+ const char *s = "@$*";
+ 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 */
- } /* end of "while line is read from /etc/mdev.conf" */
+ }
+#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_parse:
+ config_close(parser);
+#endif /* ENABLE_FEATURE_MDEV_CONF */
- if (!delete && sscanf(dev_maj_min, "%u:%u", &major, &minor) == 2) {
+ 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_CONF
+ chown(device_name, ugid.uid, ugid.gid);
- if (ENABLE_FEATURE_MDEV_RENAME && alias) {
- alias = build_alias(alias, device_name);
+#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);
+ /* 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);
- }
+ 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) {
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 && alias) {
+#if ENABLE_FEATURE_MDEV_RENAME
+ if (alias) {
alias = build_alias(alias, device_name);
unlink(alias);
free(alias);
}
+#endif
}
}
projects / oweals / busybox.git / blobdiff