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filter: allow enabling/disabling rules via envvars

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E.g. forcing a MBIM modem to run in AT-only mode:

  # MM_FILTER_RULE_NET=0     \
    MM_FILTER_RULE_CDC_WDM=0 \
    /usr/sbin/ModemManager --debug

This is just for quick testing for now.
This commit is contained in:
Aleksander Morgado
2017-10-12 23:49:10 +02:00
parent 239f7ba8a2
commit f270a09cb2
3 changed files with 48 additions and 8 deletions
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39
src/mm-filter.c
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@@ -105,6 +105,43 @@ mm_filter_port (MMFilter *self,
return FALSE;
}
/*****************************************************************************/
/* Use filter rule names as environment variables to control them on startup:
* - MM_FILTER_RULE_XXX=1 to explicitly enable the rule.
* - MM_FILTER_RULE_XXX=0 to explicitly disable the rule.
*/
static MMFilterRule
filter_rule_env_process (MMFilterRule enabled_rules)
{
MMFilterRule updated_rules = enabled_rules;
GFlagsClass *flags_class;
guint i;
flags_class = g_type_class_ref (MM_TYPE_FILTER_RULE);
for (i = 0; (1 << i) & MM_FILTER_RULE_ALL; i++) {
GFlagsValue *flags_value;
const gchar *env_value;
flags_value = g_flags_get_first_value (flags_class, (1 << i));
g_assert (flags_value);
env_value = g_getenv (flags_value->value_name);
if (!env_value)
continue;
if (g_str_equal (env_value, "0"))
updated_rules &= ~(1 << i);
else if (g_str_equal (env_value, "1"))
updated_rules |= (1 << i);
}
g_type_class_unref (flags_class);
return updated_rules;
}
/*****************************************************************************/
MMFilter *
@@ -113,7 +150,7 @@ mm_filter_new (MMFilterRule enabled_rules)
MMFilter *self;
self = g_object_new (MM_TYPE_FILTER,
MM_FILTER_ENABLED_RULES, enabled_rules,
MM_FILTER_ENABLED_RULES, filter_rule_env_process (enabled_rules),
NULL);
#define RULE_ENABLED_STR(flag) ((self->priv->enabled_rules & flag) ? "yes" : "no")