mdev: don't reparse rules on -s
function old new delta make_device 1648 1843 +195 clean_up_cur_rule - 61 +61 make_default_cur_rule - 41 +41 mdev_main 690 712 +22 ------------------------------------------------------------------------------ (add/remove: 2/0 grow/shrink: 2/0 up/down: 319/0) Total: 319 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
16714245f9
commit
3eccd7ecbe
@ -168,9 +168,29 @@
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* This happens regardless of /sys/class/.../dev existence.
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*/
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struct rule {
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bool keep_matching;
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bool regex_compiled;
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bool regex_has_slash;
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mode_t mode;
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int maj, min0, min1;
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struct bb_uidgid_t ugid;
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char *envvar;
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char *ren_mov;
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IF_FEATURE_MDEV_EXEC(char *r_cmd;)
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regex_t match;
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};
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struct globals {
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int root_major, root_minor;
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char *subsystem;
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#if ENABLE_FEATURE_MDEV_CONF
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const char *filename;
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parser_t *parser;
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struct rule **rule_vec;
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unsigned rule_idx;
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#endif
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struct rule cur_rule;
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define INIT_G() do { } while (0)
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@ -182,6 +202,164 @@ struct globals {
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/* We use additional 64+ bytes in make_device() */
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#define SCRATCH_SIZE 80
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#if 0
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# define dbg(...) bb_error_msg(__VA_ARGS__)
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#else
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# define dbg(...) ((void)0)
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#endif
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#if ENABLE_FEATURE_MDEV_CONF
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static void make_default_cur_rule(void)
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{
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memset(&G.cur_rule, 0, sizeof(G.cur_rule));
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G.cur_rule.maj = -1; /* "not a @major,minor rule" */
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G.cur_rule.mode = 0660;
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}
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static void clean_up_cur_rule(void)
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{
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free(G.cur_rule.envvar);
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if (G.cur_rule.regex_compiled)
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regfree(&G.cur_rule.match);
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free(G.cur_rule.ren_mov);
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IF_FEATURE_MDEV_EXEC(free(G.cur_rule.r_cmd);)
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make_default_cur_rule();
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}
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static void parse_next_rule(void)
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{
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/* Note: on entry, G.cur_rule is set to default */
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while (1) {
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char *tokens[4];
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char *val;
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if (!config_read(G.parser, tokens, 4, 3, "# \t", PARSE_NORMAL))
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break;
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/* Fields: [-]regex uid:gid mode [alias] [cmd] */
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dbg("token1:'%s'", tokens[1]);
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/* 1st field */
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val = tokens[0];
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G.cur_rule.keep_matching = ('-' == val[0]);
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val += G.cur_rule.keep_matching; /* swallow leading dash */
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if (val[0] == '@') {
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/* @major,minor[-minor2] */
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/* (useful when name is ambiguous:
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* "/sys/class/usb/lp0" and
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* "/sys/class/printer/lp0")
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*/
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int sc = sscanf(val, "@%u,%u-%u", &G.cur_rule.maj, &G.cur_rule.min0, &G.cur_rule.min1);
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if (sc < 2 || G.cur_rule.maj < 0) {
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bb_error_msg("bad @maj,min on line %d", G.parser->lineno);
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goto next_rule;
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}
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if (sc == 2)
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G.cur_rule.min1 = G.cur_rule.min0;
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} else {
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if (val[0] == '$') {
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char *eq = strchr(++val, '=');
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if (!eq) {
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bb_error_msg("bad $envvar=regex on line %d", G.parser->lineno);
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goto next_rule;
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}
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G.cur_rule.envvar = xstrndup(val, eq - val);
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val = eq + 1;
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}
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xregcomp(&G.cur_rule.match, val, REG_EXTENDED);
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G.cur_rule.regex_compiled = 1;
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G.cur_rule.regex_has_slash = (strchr(val, '/') != NULL);
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}
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/* 2nd field: uid:gid - device ownership */
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if (get_uidgid(&G.cur_rule.ugid, tokens[1], /*allow_numeric:*/ 1) == 0) {
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bb_error_msg("unknown user/group '%s' on line %d", tokens[1], G.parser->lineno);
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goto next_rule;
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}
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/* 3rd field: mode - device permissions */
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bb_parse_mode(tokens[2], &G.cur_rule.mode);
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/* 4th field (opt): ">|=alias" or "!" to not create the node */
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val = tokens[3];
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if (ENABLE_FEATURE_MDEV_RENAME && val && strchr(">=!", val[0])) {
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char *s = skip_non_whitespace(val);
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G.cur_rule.ren_mov = xstrndup(val, s - val);
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val = skip_whitespace(s);
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}
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if (ENABLE_FEATURE_MDEV_EXEC && val && val[0]) {
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const char *s = "$@*";
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const char *s2 = strchr(s, val[0]);
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if (!s2) {
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bb_error_msg("bad line %u", G.parser->lineno);
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goto next_rule;
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}
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IF_FEATURE_MDEV_EXEC(G.cur_rule.r_cmd = xstrdup(val);)
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}
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return;
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next_rule:
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clean_up_cur_rule();
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} /* while (config_read) */
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dbg("config_close(G.parser)");
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config_close(G.parser);
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G.parser = NULL;
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return;
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}
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/* If mdev -s, we remember rules in G.rule_vec[].
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* Otherwise, there is no point in doing it, and we just
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* save only one parsed rule in G.cur_rule.
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*/
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static const struct rule *next_rule(void)
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{
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struct rule *rule;
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/* Open conf file if we didn't do it yet */
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if (!G.parser && G.filename) {
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dbg("config_open('%s')", G.filename);
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G.parser = config_open2(G.filename, fopen_for_read);
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G.filename = NULL;
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}
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if (G.rule_vec) {
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/* mdev -s */
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/* Do we have rule parsed already? */
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if (G.rule_vec[G.rule_idx]) {
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dbg("< G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
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return G.rule_vec[G.rule_idx++];
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}
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make_default_cur_rule();
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} else {
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/* not mdev -s */
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clean_up_cur_rule();
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}
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/* Parse one more rule if file isn't fully read */
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rule = &G.cur_rule;
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if (G.parser) {
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parse_next_rule();
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if (G.rule_vec) { /* mdev -s */
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rule = memcpy(xmalloc(sizeof(G.cur_rule)), &G.cur_rule, sizeof(G.cur_rule));
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G.rule_vec = xrealloc_vector(G.rule_vec, 4, G.rule_idx);
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G.rule_vec[G.rule_idx++] = rule;
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dbg("> G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
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}
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}
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return rule;
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}
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#else
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# define next_rule() (&G.cur_rule)
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#endif
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/* Builds an alias path.
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* This function potentionally reallocates the alias parameter.
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@ -218,8 +396,8 @@ static void make_device(char *path, int delete)
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{
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char *device_name, *subsystem_slash_devname;
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int major, minor, type, len;
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mode_t mode;
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parser_t *parser;
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dbg("%s('%s', delete:%d)", __func__, path, delete);
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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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@ -272,246 +450,184 @@ static void make_device(char *path, int delete)
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path = subsystem_slash_devname;
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}
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/* If we have config file, look up user settings */
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if (ENABLE_FEATURE_MDEV_CONF)
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parser = config_open2("/etc/mdev.conf", fopen_for_read);
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do {
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int keep_matching;
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struct bb_uidgid_t ugid;
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char *tokens[4];
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char *command = NULL;
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char *alias = NULL;
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#if ENABLE_FEATURE_MDEV_CONF
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G.rule_idx = 0; /* restart from the beginning (think mdev -s) */
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#endif
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for (;;) {
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const char *str_to_match;
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regmatch_t off[1 + 9 * ENABLE_FEATURE_MDEV_RENAME_REGEXP];
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char *command;
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char *alias;
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char aliaslink = aliaslink; /* for compiler */
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const char *node_name;
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const struct rule *rule;
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/* Defaults in case we won't match any line */
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ugid.uid = ugid.gid = 0;
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keep_matching = 0;
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mode = 0660;
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str_to_match = "";
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if (ENABLE_FEATURE_MDEV_CONF
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&& config_read(parser, tokens, 4, 3, "# \t", PARSE_NORMAL)
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) {
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char *val;
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char *str_to_match;
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regmatch_t off[1 + 9 * ENABLE_FEATURE_MDEV_RENAME_REGEXP];
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rule = next_rule();
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val = tokens[0];
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keep_matching = ('-' == val[0]);
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val += keep_matching; /* swallow leading dash */
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#if ENABLE_FEATURE_MDEV_CONF
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if (rule->maj >= 0) { /* @maj,min rule */
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if (major != rule->maj)
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continue;
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if (minor < rule->min0 || minor > rule->min1)
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continue;
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memset(off, 0, sizeof(off));
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goto rule_matches;
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}
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if (rule->envvar) { /* $envvar=regex rule */
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str_to_match = getenv(rule->envvar);
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dbg("getenv('%s'):'%s'", rule->envvar, str_to_match);
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if (!str_to_match)
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continue;
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} else {
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/* regex to match [subsystem/]device_name */
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str_to_match = (rule->regex_has_slash ? path : device_name);
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}
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/* Match against either "subsystem/device_name"
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* or "device_name" alone */
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str_to_match = strchr(val, '/') ? path : device_name;
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if (rule->regex_compiled) {
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int regex_match = regexec(&rule->match, str_to_match, ARRAY_SIZE(off), off, 0);
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dbg("regex_match for '%s':%d", str_to_match, regex_match);
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//bb_error_msg("matches:");
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//for (int i = 0; i < ARRAY_SIZE(off); i++) {
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// if (off[i].rm_so < 0) continue;
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// bb_error_msg("match %d: '%.*s'\n", i,
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// (int)(off[i].rm_eo - off[i].rm_so),
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// device_name + off[i].rm_so);
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//}
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/* Fields: regex uid:gid mode [alias] [cmd] */
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if (val[0] == '@') {
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/* @major,minor[-minor2] */
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/* (useful when name is ambiguous:
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* "/sys/class/usb/lp0" and
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* "/sys/class/printer/lp0") */
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int cmaj, cmin0, cmin1, sc;
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if (major < 0)
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continue; /* no dev, no match */
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sc = sscanf(val, "@%u,%u-%u", &cmaj, &cmin0, &cmin1);
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if (sc < 1
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|| major != cmaj
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|| (sc == 2 && minor != cmin0)
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|| (sc == 3 && (minor < cmin0 || minor > cmin1))
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) {
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continue; /* this line doesn't match */
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}
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goto line_matches;
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if (regex_match != 0
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/* regexec returns whole pattern as "range" 0 */
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|| off[0].rm_so != 0
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|| (int)off[0].rm_eo != (int)strlen(str_to_match)
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) {
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continue; /* this rule doesn't match */
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}
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if (val[0] == '$') {
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/* regex to match an environment variable */
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char *eq = strchr(++val, '=');
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if (!eq)
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continue;
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*eq = '\0';
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str_to_match = getenv(val);
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if (!str_to_match)
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continue;
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str_to_match -= strlen(val) + 1;
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*eq = '=';
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}
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/* else: it's final implicit "match-all" rule */
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#endif
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rule_matches:
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dbg("rule matched");
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/* Build alias name */
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alias = NULL;
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if (ENABLE_FEATURE_MDEV_RENAME && rule->ren_mov) {
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aliaslink = rule->ren_mov[0];
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if (aliaslink == '!') {
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/* "!": suppress node creation/deletion */
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major = -2;
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}
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/* else: regex to match [subsystem/]device_name */
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else if (aliaslink == '>' || aliaslink == '=') {
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if (ENABLE_FEATURE_MDEV_RENAME_REGEXP) {
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char *s;
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char *p;
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unsigned n;
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{
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regex_t match;
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int result;
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/* substitute %1..9 with off[1..9], if any */
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n = 0;
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s = rule->ren_mov;
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while (*s)
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if (*s++ == '%')
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n++;
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xregcomp(&match, val, REG_EXTENDED);
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result = regexec(&match, str_to_match, ARRAY_SIZE(off), off, 0);
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regfree(&match);
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//bb_error_msg("matches:");
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//for (int i = 0; i < ARRAY_SIZE(off); i++) {
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// if (off[i].rm_so < 0) continue;
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// bb_error_msg("match %d: '%.*s'\n", i,
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// (int)(off[i].rm_eo - off[i].rm_so),
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// device_name + off[i].rm_so);
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//}
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/* If no match, skip rest of line */
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/* (regexec returns whole pattern as "range" 0) */
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if (result
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|| off[0].rm_so
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|| ((int)off[0].rm_eo != (int)strlen(str_to_match))
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) {
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continue; /* this line doesn't match */
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}
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}
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line_matches:
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/* This line matches. Stop parsing after parsing
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* the rest the line unless keep_matching == 1 */
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/* 2nd field: uid:gid - device ownership */
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if (get_uidgid(&ugid, tokens[1], /*allow_numeric:*/ 1) == 0)
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bb_error_msg("unknown user/group %s on line %d", tokens[1], parser->lineno);
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/* 3rd field: mode - device permissions */
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bb_parse_mode(tokens[2], &mode);
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val = tokens[3];
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/* 4th field (opt): ">|=alias" or "!" to not create the node */
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if (ENABLE_FEATURE_MDEV_RENAME && val) {
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char *a, *s, *st;
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a = val;
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s = strchrnul(val, ' ');
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st = strchrnul(val, '\t');
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if (st < s)
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s = st;
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st = (s[0] && s[1]) ? s+1 : NULL;
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aliaslink = a[0];
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if (aliaslink == '!' && s == a+1) {
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val = st;
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/* "!": suppress node creation/deletion */
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major = -2;
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}
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else if (aliaslink == '>' || aliaslink == '=') {
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val = st;
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s[0] = '\0';
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if (ENABLE_FEATURE_MDEV_RENAME_REGEXP) {
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char *p;
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unsigned i, n;
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/* substitute %1..9 with off[1..9], if any */
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n = 0;
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s = a;
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while (*s)
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if (*s++ == '%')
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n++;
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p = alias = xzalloc(strlen(a) + n * strlen(str_to_match));
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s = a + 1;
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while (*s) {
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*p = *s;
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if ('%' == *s) {
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i = (s[1] - '0');
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if (i <= 9 && off[i].rm_so >= 0) {
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n = off[i].rm_eo - off[i].rm_so;
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strncpy(p, str_to_match + off[i].rm_so, n);
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p += n - 1;
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s++;
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}
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p = alias = xzalloc(strlen(rule->ren_mov) + n * strlen(str_to_match));
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s = rule->ren_mov + 1;
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while (*s) {
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*p = *s;
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if ('%' == *s) {
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unsigned i = (s[1] - '0');
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if (i <= 9 && off[i].rm_so >= 0) {
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n = off[i].rm_eo - off[i].rm_so;
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strncpy(p, str_to_match + off[i].rm_so, n);
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p += n - 1;
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s++;
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}
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p++;
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s++;
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}
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} else {
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alias = xstrdup(a + 1);
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p++;
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s++;
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}
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}
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}
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if (ENABLE_FEATURE_MDEV_EXEC && val) {
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const char *s = "$@*";
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const char *s2 = strchr(s, val[0]);
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if (!s2) {
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bb_error_msg("bad line %u", parser->lineno);
|
||||
if (ENABLE_FEATURE_MDEV_RENAME)
|
||||
free(alias);
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Are we running this command now?
|
||||
* Run $cmd on delete, @cmd on create, *cmd on both
|
||||
*/
|
||||
if (s2 - s != delete) {
|
||||
/* We are here if: '*',
|
||||
* or: '@' and delete = 0,
|
||||
* or: '$' and delete = 1
|
||||
*/
|
||||
command = xstrdup(val + 1);
|
||||
} else {
|
||||
alias = xstrdup(rule->ren_mov + 1);
|
||||
}
|
||||
}
|
||||
}
|
||||
dbg("alias:'%s'", alias);
|
||||
|
||||
/* End of field parsing */
|
||||
command = NULL;
|
||||
IF_FEATURE_MDEV_EXEC(command = rule->r_cmd;)
|
||||
if (command) {
|
||||
const char *s = "$@*";
|
||||
const char *s2 = strchr(s, command[0]);
|
||||
|
||||
/* Are we running this command now?
|
||||
* Run $cmd on delete, @cmd on create, *cmd on both
|
||||
*/
|
||||
if (s2 - s != delete) {
|
||||
/* We are here if: '*',
|
||||
* or: '@' and delete = 0,
|
||||
* or: '$' and delete = 1
|
||||
*/
|
||||
command++;
|
||||
} else {
|
||||
command = NULL;
|
||||
}
|
||||
}
|
||||
dbg("command:'%s'", command);
|
||||
|
||||
/* "Execute" the line we found */
|
||||
{
|
||||
const char *node_name;
|
||||
|
||||
node_name = device_name;
|
||||
if (ENABLE_FEATURE_MDEV_RENAME && alias)
|
||||
node_name = alias = build_alias(alias, device_name);
|
||||
|
||||
if (!delete && major >= 0) {
|
||||
if (mknod(node_name, mode | type, makedev(major, minor)) && errno != EEXIST)
|
||||
bb_perror_msg("can't create '%s'", node_name);
|
||||
if (major == G.root_major && minor == G.root_minor)
|
||||
symlink(node_name, "root");
|
||||
if (ENABLE_FEATURE_MDEV_CONF) {
|
||||
chmod(node_name, mode);
|
||||
chown(node_name, ugid.uid, ugid.gid);
|
||||
}
|
||||
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
|
||||
if (aliaslink == '>')
|
||||
symlink(node_name, device_name);
|
||||
}
|
||||
}
|
||||
|
||||
if (ENABLE_FEATURE_MDEV_EXEC && command) {
|
||||
/* setenv will leak memory, use putenv/unsetenv/free */
|
||||
char *s = xasprintf("%s=%s", "MDEV", node_name);
|
||||
char *s1 = xasprintf("%s=%s", "SUBSYSTEM", G.subsystem);
|
||||
putenv(s);
|
||||
putenv(s1);
|
||||
if (system(command) == -1)
|
||||
bb_perror_msg("can't run '%s'", command);
|
||||
bb_unsetenv_and_free(s1);
|
||||
bb_unsetenv_and_free(s);
|
||||
free(command);
|
||||
}
|
||||
|
||||
if (delete && major >= -1) {
|
||||
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
|
||||
if (aliaslink == '>')
|
||||
unlink(device_name);
|
||||
}
|
||||
unlink(node_name);
|
||||
}
|
||||
|
||||
if (ENABLE_FEATURE_MDEV_RENAME)
|
||||
free(alias);
|
||||
node_name = device_name;
|
||||
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
|
||||
node_name = alias = build_alias(alias, device_name);
|
||||
dbg("alias2:'%s'", alias);
|
||||
}
|
||||
|
||||
if (!delete && major >= 0) {
|
||||
dbg("mknod('%s',%o,(%d,%d))", node_name, rule->mode | type, major, minor);
|
||||
if (mknod(node_name, rule->mode | type, makedev(major, minor)) && errno != EEXIST)
|
||||
bb_perror_msg("can't create '%s'", node_name);
|
||||
if (major == G.root_major && minor == G.root_minor)
|
||||
symlink(node_name, "root");
|
||||
if (ENABLE_FEATURE_MDEV_CONF) {
|
||||
chmod(node_name, rule->mode);
|
||||
chown(node_name, rule->ugid.uid, rule->ugid.gid);
|
||||
}
|
||||
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
|
||||
if (aliaslink == '>')
|
||||
symlink(node_name, device_name);
|
||||
}
|
||||
}
|
||||
|
||||
if (ENABLE_FEATURE_MDEV_EXEC && command) {
|
||||
/* setenv will leak memory, use putenv/unsetenv/free */
|
||||
char *s = xasprintf("%s=%s", "MDEV", node_name);
|
||||
char *s1 = xasprintf("%s=%s", "SUBSYSTEM", G.subsystem);
|
||||
putenv(s);
|
||||
putenv(s1);
|
||||
if (system(command) == -1)
|
||||
bb_perror_msg("can't run '%s'", command);
|
||||
bb_unsetenv_and_free(s1);
|
||||
bb_unsetenv_and_free(s);
|
||||
}
|
||||
|
||||
if (delete && major >= -1) {
|
||||
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
|
||||
if (aliaslink == '>')
|
||||
unlink(device_name);
|
||||
}
|
||||
unlink(node_name);
|
||||
}
|
||||
|
||||
if (ENABLE_FEATURE_MDEV_RENAME)
|
||||
free(alias);
|
||||
|
||||
/* We found matching line.
|
||||
* Stop unless it was prefixed with '-' */
|
||||
if (ENABLE_FEATURE_MDEV_CONF && !keep_matching)
|
||||
* Stop unless it was prefixed with '-'
|
||||
*/
|
||||
if (!ENABLE_FEATURE_MDEV_CONF || !rule->keep_matching)
|
||||
break;
|
||||
} /* for (;;) */
|
||||
|
||||
/* end of "while line is read from /etc/mdev.conf" */
|
||||
} while (ENABLE_FEATURE_MDEV_CONF);
|
||||
|
||||
if (ENABLE_FEATURE_MDEV_CONF)
|
||||
config_close(parser);
|
||||
free(subsystem_slash_devname);
|
||||
}
|
||||
|
||||
@ -618,6 +734,10 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
|
||||
|
||||
INIT_G();
|
||||
|
||||
#if ENABLE_FEATURE_MDEV_CONF
|
||||
G.filename = "/etc/mdev.conf";
|
||||
#endif
|
||||
|
||||
/* We can be called as hotplug helper */
|
||||
/* Kernel cannot provide suitable stdio fds for us, do it ourself */
|
||||
bb_sanitize_stdio();
|
||||
@ -633,6 +753,10 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
|
||||
*/
|
||||
struct stat st;
|
||||
|
||||
#if ENABLE_FEATURE_MDEV_CONF
|
||||
/* Same as xrealloc_vector(NULL, 4, 0): */
|
||||
G.rule_vec = xzalloc((1 << 4) * sizeof(*G.rule_vec));
|
||||
#endif
|
||||
xstat("/", &st);
|
||||
G.root_major = major(st.st_dev);
|
||||
G.root_minor = minor(st.st_dev);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user