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udev: add SYSCTL{} support

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This commit is contained in:
Kay Sievers 2015-03-11 11:15:53 +01:00
parent 88a60da054
commit f4cf2e5b2f
2 changed files with 71 additions and 2 deletions
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12
man/udev.xml
View File

@ -193,6 +193,11 @@
value itself contains trailing whitespace.
</para>
</listitem>
<term><varname>SYSCTL{<replaceable>kernel parameter</replaceable>}</varname></term>
<listitem>
<para>Match a kernel parameter value.
</para>
</listitem>
</varlistentry>
<varlistentry>
@ -374,6 +379,13 @@
</listitem>
</varlistentry>
<varlistentry>
<term><varname>SYSCTL{<replaceable>kernel parameter</replaceable>}</varname></term>
<listitem>
<para>The value that should be written to kernel parameter.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>ENV{<replaceable>key</replaceable>}</varname></term>
<listitem>

61
src/udev/udev-rules.c
View File

@ -35,6 +35,7 @@
#include "strbuf.h"
#include "strv.h"
#include "util.h"
#include "sysctl-util.h"
#define PREALLOC_TOKEN 2048
@ -128,6 +129,7 @@ enum token_type {
TK_M_DRIVER, /* val */
TK_M_WAITFOR, /* val */
TK_M_ATTR, /* val, attr */
TK_M_SYSCTL, /* val, attr */
TK_M_PARENTS_MIN,
TK_M_KERNELS, /* val */
@ -166,6 +168,7 @@ enum token_type {
TK_A_NAME, /* val */
TK_A_DEVLINK, /* val */
TK_A_ATTR, /* val, attr */
TK_A_SYSCTL, /* val, attr */
TK_A_RUN_BUILTIN, /* val, bool */
TK_A_RUN_PROGRAM, /* val, bool */
TK_A_GOTO, /* size_t */
@ -262,6 +265,7 @@ static const char *token_str(enum token_type type) {
[TK_M_DRIVER] = "M DRIVER",
[TK_M_WAITFOR] = "M WAITFOR",
[TK_M_ATTR] = "M ATTR",
[TK_M_SYSCTL] = "M SYSCTL",
[TK_M_PARENTS_MIN] = "M PARENTS_MIN",
[TK_M_KERNELS] = "M KERNELS",
@ -300,6 +304,7 @@ static const char *token_str(enum token_type type) {
[TK_A_NAME] = "A NAME",
[TK_A_DEVLINK] = "A DEVLINK",
[TK_A_ATTR] = "A ATTR",
[TK_A_SYSCTL] = "A SYSCTL",
[TK_A_RUN_BUILTIN] = "A RUN_BUILTIN",
[TK_A_RUN_PROGRAM] = "A RUN_PROGRAM",
[TK_A_GOTO] = "A GOTO",
@ -363,9 +368,11 @@ static void dump_token(struct udev_rules *rules, struct token *token) {
log_debug("%s %i '%s'", token_str(type), token->key.builtin_cmd, value);
break;
case TK_M_ATTR:
case TK_M_SYSCTL:
case TK_M_ATTRS:
case TK_M_ENV:
case TK_A_ATTR:
case TK_A_SYSCTL:
case TK_A_ENV:
log_debug("%s %s '%s' '%s'(%s)",
token_str(type), operation_str(op), attr, value, string_glob_str(glob));
@ -897,8 +904,10 @@ static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
break;
case TK_M_ENV:
case TK_M_ATTR:
case TK_M_SYSCTL:
case TK_M_ATTRS:
case TK_A_ATTR:
case TK_A_SYSCTL:
case TK_A_ENV:
case TK_A_SECLABEL:
attr = data;
@ -1135,11 +1144,27 @@ static int add_rule(struct udev_rules *rules, char *line,
log_error("invalid ATTR operation");
goto invalid;
}
if (op < OP_MATCH_MAX) {
if (op < OP_MATCH_MAX)
rule_add_key(&rule_tmp, TK_M_ATTR, op, value, attr);
} else {
else
rule_add_key(&rule_tmp, TK_A_ATTR, op, value, attr);
continue;
}
if (startswith(key, "SYSCTL{")) {
attr = get_key_attribute(rules->udev, key + strlen("SYSCTL"));
if (attr == NULL) {
log_error("error parsing SYSCTL attribute");
goto invalid;
}
if (op == OP_REMOVE) {
log_error("invalid SYSCTL operation");
goto invalid;
}
if (op < OP_MATCH_MAX)
rule_add_key(&rule_tmp, TK_M_SYSCTL, op, value, attr);
else
rule_add_key(&rule_tmp, TK_A_SYSCTL, op, value, attr);
continue;
}
@ -1986,6 +2011,23 @@ int udev_rules_apply_to_event(struct udev_rules *rules,
if (match_attr(rules, event->dev, event, cur) != 0)
goto nomatch;
break;
case TK_M_SYSCTL: {
char filename[UTIL_PATH_SIZE];
_cleanup_free_ char *value = NULL;
size_t len;
udev_event_apply_format(event, rules_str(rules, cur->key.attr_off), filename, sizeof(filename));
sysctl_normalize(filename);
if (sysctl_read(filename, &value) < 0)
goto nomatch;
len = strlen(value);
while (len > 0 && isspace(value[--len]))
value[len] = '\0';
if (match_key(rules, cur, value) != 0)
goto nomatch;
break;
}
case TK_M_KERNELS:
case TK_M_SUBSYSTEMS:
case TK_M_DRIVERS:
@ -2522,6 +2564,21 @@ int udev_rules_apply_to_event(struct udev_rules *rules,
}
break;
}
case TK_A_SYSCTL: {
char filename[UTIL_PATH_SIZE];
char value[UTIL_NAME_SIZE];
int r;
udev_event_apply_format(event, rules_str(rules, cur->key.attr_off), filename, sizeof(filename));
sysctl_normalize(filename);
udev_event_apply_format(event, rules_str(rules, cur->key.value_off), value, sizeof(value));
log_debug("SYSCTL '%s' writing '%s' %s:%u", filename, value,
rules_str(rules, rule->rule.filename_off), rule->rule.filename_line);
r = sysctl_write(filename, value);
if (r < 0)
log_error("error writing SYSCTL{%s}='%s': %s", filename, value, strerror(-r));
break;
}
case TK_A_RUN_BUILTIN:
case TK_A_RUN_PROGRAM: {
struct udev_list_entry *entry;