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dhclient: use fqdn.fqdn for server DDNS updates

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dhclient only supports fqdn.fqdn for server DDNS updates with
DHCPv6.  And even though the underlying DHCP options that fqdn.fqdn
controls allow non-qualified hostnames on the wire, dhclient does
not.  So we must require a fully-qualified name for DHCPv6.

Second, while no-client-updates seems like it should be "off", doing
that apparently makes dhclient set the "O" flag to 1 which appears to
be a bug, and results in the server not doing the DDNS update.  So
we must stop setting that option too.

Found by: Alexander Groß
This commit is contained in:
Dan Williams
2015-02-24 17:04:01 -06:00
parent 8d29b3a631
commit 677cee0f23
2 changed files with 82 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
src/dhcp-manager/nm-dhcp-dhclient-utils.c
View File

@@ -39,8 +39,8 @@
#define HOSTNAME4_TAG "send host-name"
#define HOSTNAME4_FORMAT HOSTNAME4_TAG " \"%s\"; # added by NetworkManager"
#define HOSTNAME6_TAG "send fqdn.fqdn"
#define HOSTNAME6_FORMAT HOSTNAME6_TAG " \"%s\"; # added by NetworkManager"
#define FQDN_TAG "send fqdn.fqdn"
#define FQDN_FORMAT FQDN_TAG " \"%s\"; # added by NetworkManager"
#define ALSOREQ_TAG "also request "
@@ -57,7 +57,7 @@ add_also_request (GPtrArray *array, const char *item)
}
static void
add_hostname (GString *str, const char *format, const char *hostname)
add_hostname4 (GString *str, const char *format, const char *hostname)
{
char *plain_hostname, *dot;
@@ -109,7 +109,7 @@ add_ip4_config (GString *str, GBytes *client_id, const char *hostname)
g_string_append (str, "; # added by NetworkManager\n");
}
add_hostname (str, HOSTNAME4_FORMAT "\n", hostname);
add_hostname4 (str, HOSTNAME4_FORMAT "\n", hostname);
g_string_append_c (str, '\n');
@@ -125,13 +125,18 @@ add_ip4_config (GString *str, GBytes *client_id, const char *hostname)
}
static void
add_ip6_config (GString *str, const char *hostname)
add_hostname6 (GString *str, const char *hostname)
{
add_hostname (str, HOSTNAME6_FORMAT "\n", hostname);
/* dhclient only supports the fqdn.fqdn for DHCPv6 and requires a fully-
* qualified name for this option, so we must require one here too.
*/
if (hostname && strchr (hostname, '.')) {
g_string_append_printf (str, FQDN_FORMAT "\n", hostname);
g_string_append (str,
"send fqdn.encoded on;\n"
"send fqdn.no-client-update on;\n"
"send fqdn.server-update on;\n");
g_string_append_c (str, '\n');
}
}
static GBytes *
@@ -232,7 +237,7 @@ nm_dhcp_dhclient_create_config (const char *interface,
if (hostname) {
if (strncmp (p, HOSTNAME4_TAG, strlen (HOSTNAME4_TAG)) == 0)
continue;
if (strncmp (p, HOSTNAME6_TAG, strlen (HOSTNAME6_TAG)) == 0)
if (strncmp (p, FQDN_TAG, strlen (FQDN_TAG)) == 0)
continue;
}
@@ -290,7 +295,7 @@ nm_dhcp_dhclient_create_config (const char *interface,
g_string_append_c (new_contents, '\n');
if (is_ip6) {
add_ip6_config (new_contents, hostname);
add_hostname6 (new_contents, hostname);
add_also_request (alsoreq, "dhcp6.name-servers");
add_also_request (alsoreq, "dhcp6.domain-search");
add_also_request (alsoreq, "dhcp6.client-id");

76
src/dhcp-manager/tests/test-dhcp-dhclient.c
View File

@@ -39,6 +39,7 @@
static void
test_config (const char *orig,
const char *expected,
gboolean ipv6,
const char *hostname,
const char *dhcp_client_id,
GBytes *expected_new_client_id,
@@ -55,7 +56,7 @@ test_config (const char *orig,
}
new = nm_dhcp_dhclient_create_config (iface,
FALSE,
ipv6,
client_id,
anycast_addr,
hostname,
@@ -103,7 +104,7 @@ static const char *orig_missing_expected = \
static void
test_orig_missing (void)
{
test_config (NULL, orig_missing_expected, NULL, NULL, NULL, "eth0", NULL);
test_config (NULL, orig_missing_expected, FALSE, NULL, NULL, NULL, "eth0", NULL);
}
/*******************************************/
@@ -132,7 +133,7 @@ static void
test_override_client_id (void)
{
test_config (override_client_id_orig, override_client_id_expected,
NULL,
FALSE, NULL,
"11:22:33:44:55:66",
NULL,
"eth0",
@@ -161,7 +162,7 @@ static void
test_quote_client_id (void)
{
test_config (NULL, quote_client_id_expected,
NULL,
FALSE, NULL,
"1234",
NULL,
"eth0",
@@ -190,7 +191,7 @@ static void
test_ascii_client_id (void)
{
test_config (NULL, ascii_client_id_expected,
NULL,
FALSE, NULL,
"qb:cd:ef:12:34:56",
NULL,
"eth0",
@@ -219,7 +220,7 @@ static void
test_hex_single_client_id (void)
{
test_config (NULL, hex_single_client_id_expected,
NULL,
FALSE, NULL,
"ab:cd:e:12:34:56",
NULL,
"eth0",
@@ -256,7 +257,7 @@ test_existing_hex_client_id (void)
new_client_id = g_bytes_new (bytes, sizeof (bytes));
test_config (existing_hex_client_id_orig, existing_hex_client_id_expected,
NULL,
FALSE, NULL,
NULL,
new_client_id,
"eth0",
@@ -296,7 +297,7 @@ test_existing_ascii_client_id (void)
memcpy (buf + 1, EACID, STRLEN (EACID));
new_client_id = g_bytes_new (buf, sizeof (buf));
test_config (existing_ascii_client_id_orig, existing_ascii_client_id_expected,
NULL,
FALSE, NULL,
NULL,
new_client_id,
"eth0",
@@ -329,7 +330,58 @@ static void
test_override_hostname (void)
{
test_config (override_hostname_orig, override_hostname_expected,
"blahblah",
FALSE, "blahblah",
NULL,
NULL,
"eth0",
NULL);
}
/*******************************************/
static const char *override_hostname6_orig = \
"send fqdn.fqdn \"foobar\";\n";
static const char *override_hostname6_expected = \
"# Created by NetworkManager\n"
"# Merged from /path/to/dhclient.conf\n"
"\n"
"send fqdn.fqdn \"blahblah.local\"; # added by NetworkManager\n"
"send fqdn.encoded on;\n"
"send fqdn.server-update on;\n"
"\n"
"also request dhcp6.name-servers;\n"
"also request dhcp6.domain-search;\n"
"also request dhcp6.client-id;\n"
"\n";
static void
test_override_hostname6 (void)
{
test_config (override_hostname6_orig, override_hostname6_expected,
TRUE, "blahblah.local",
NULL,
NULL,
"eth0",
NULL);
}
/*******************************************/
static const char *nonfqdn_hostname6_expected = \
"# Created by NetworkManager\n"
"\n"
"also request dhcp6.name-servers;\n"
"also request dhcp6.domain-search;\n"
"also request dhcp6.client-id;\n"
"\n";
static void
test_nonfqdn_hostname6 (void)
{
/* Non-FQDN hostname can't be used with dhclient */
test_config (NULL, nonfqdn_hostname6_expected,
TRUE, "blahblah",
NULL,
NULL,
"eth0",
@@ -364,7 +416,7 @@ static void
test_existing_alsoreq (void)
{
test_config (existing_alsoreq_orig, existing_alsoreq_expected,
NULL,
FALSE, NULL,
NULL,
NULL,
"eth0",
@@ -403,7 +455,7 @@ static void
test_existing_multiline_alsoreq (void)
{
test_config (existing_multiline_alsoreq_orig, existing_multiline_alsoreq_expected,
NULL,
FALSE, NULL,
NULL,
NULL,
"eth0",
@@ -721,6 +773,8 @@ main (int argc, char **argv)
g_test_add_func ("/dhcp/dhclient/existing-hex-client-id", test_existing_hex_client_id);
g_test_add_func ("/dhcp/dhclient/existing-ascii-client-id", test_existing_ascii_client_id);
g_test_add_func ("/dhcp/dhclient/override_hostname", test_override_hostname);
g_test_add_func ("/dhcp/dhclient/override_hostname6", test_override_hostname6);
g_test_add_func ("/dhcp/dhclient/nonfqdn_hostname6", test_nonfqdn_hostname6);
g_test_add_func ("/dhcp/dhclient/existing_alsoreq", test_existing_alsoreq);
g_test_add_func ("/dhcp/dhclient/existing_multiline_alsoreq", test_existing_multiline_alsoreq);
g_test_add_func ("/dhcp/dhclient/duids", test_duids);