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dhcp: detect NMIP4Config 'metered' flag based on ANDROID_METERED DHCP option

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Some versions of Android's DHCP server send option 43 (Vendor specific
information) with value "ANDROID_METERED" in Wi-Fi hotspot mode.

Mark the NMIP4Config as metered when such option is received.
This commit is contained in:
Beniamino Galvani 2015-05-06 14:07:21 +02:00
parent 3c2f4a17f9
commit 1e39b2320d
3 changed files with 35 additions and 0 deletions
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7
src/dhcp-manager/nm-dhcp-systemd.c
View file

@ -226,6 +226,8 @@ lease_to_ip4_config (const char *iface,
guint16 mtu;
int r, num;
guint64 end_time;
uint8_t *data;
gboolean metered = FALSE;
g_return_val_if_fail (lease != NULL, NULL);
@ -357,6 +359,11 @@ lease_to_ip4_config (const char *iface,
g_string_free (l, TRUE);
}
num = sd_dhcp_lease_get_vendor_specific (lease, &data);
if (num > 0)
metered = !!memmem (data, num, "ANDROID_METERED", STRLEN ("ANDROID_METERED"));
nm_ip4_config_set_metered (ip4_config, metered);
return ip4_config;
}

3
src/dhcp-manager/nm-dhcp-utils.c
View file

@ -576,6 +576,9 @@ nm_dhcp_utils_ip4_config_from_options (int ifindex,
g_strfreev (nis);
}
str = g_hash_table_lookup (options, "vendor_encapsulated_options");
nm_ip4_config_set_metered (ip4_config, str && strstr (str, "ANDROID_METERED"));
return ip4_config;
error:

25
src/dhcp-manager/tests/test-dhcp-utils.c
View file

@ -175,6 +175,30 @@ test_wins_options (void)
g_hash_table_destroy (options);
}
static void
test_vendor_option_metered (void)
{
GHashTable *options;
NMIP4Config *ip4_config;
static const Option data[] = {
{ "vendor_encapsulated_options", "ANDROID_METERED" },
{ NULL, NULL }
};
options = fill_table (generic_options, NULL);
ip4_config = nm_dhcp_utils_ip4_config_from_options (1, "eth0", options, 0);
g_assert (ip4_config);
g_assert (nm_ip4_config_get_metered (ip4_config) == FALSE);
g_hash_table_destroy (options);
options = fill_table (generic_options, NULL);
options = fill_table (data, options);
ip4_config = nm_dhcp_utils_ip4_config_from_options (1, "eth0", options, 0);
g_assert (ip4_config);
g_assert (nm_ip4_config_get_metered (ip4_config) == TRUE);
g_hash_table_destroy (options);
}
static void
ip4_test_route (NMIP4Config *ip4_config,
guint route_num,
@ -716,6 +740,7 @@ int main (int argc, char **argv)
g_test_add_func ("/dhcp/ip4-missing-prefix-8", test_ip4_missing_prefix_8);
g_test_add_func ("/dhcp/ip4-prefix-classless", test_ip4_prefix_classless);
g_test_add_func ("/dhcp/client-id-from-string", test_client_id_from_string);
g_test_add_func ("/dhcp/vendor-option-metered", test_vendor_option_metered);
return g_test_run ();
}