[PATCH v2 1/2] netconfig: Add IPv4 domain name helper and installer

[PATCH v2 1/2] netconfig: Add IPv4 domain name helper and installer

[Tim Kourt]

[-- Attachment #1: Type: text/plain, Size: 2166 bytes --]

The provided domain name helper allows to override the DHCP lease
option value with the static one from network configuration file.
---
 src/netconfig.c | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/src/netconfig.c b/src/netconfig.c
index 9d32c37a..e7176444 100644
--- a/src/netconfig.c
+++ b/src/netconfig.c
@@ -251,6 +251,28 @@ static char **netconfig_ipv4_get_dns(struct netconfig *netconfig, uint8_t proto)
 	return NULL;
 }
 
+static char *netconfig_ipv4_get_domain_name(struct netconfig *netconfig,
+								uint8_t proto)
+{
+	const struct l_dhcp_lease *lease;
+	char *domain_name;
+
+	domain_name = l_settings_get_string(netconfig->active_settings,
+							"IPv4", "DomainName");
+	if (domain_name)
+		/* Allow to override the DHCP domain name with setting entry. */
+		return domain_name;
+
+	if (proto != RTPROT_DHCP)
+		return NULL;
+
+	lease = l_dhcp_client_get_lease(netconfig->dhcp_client);
+	if (!lease)
+		return NULL;
+
+	return l_dhcp_lease_get_domain_name(lease);
+}
+
 static struct netconfig_ifaddr *netconfig_ipv6_get_ifaddr(
 						struct netconfig *netconfig,
 						uint8_t proto)
@@ -685,6 +707,7 @@ static void netconfig_ipv4_ifaddr_add_cmd_cb(int error, uint16_t type,
 	struct netconfig *netconfig = user_data;
 	struct netconfig_ifaddr *ifaddr;
 	char **dns;
+	char *domain_name;
 
 	if (error && error != -EEXIST) {
 		l_error("netconfig: Failed to add IP address. "
@@ -709,12 +732,21 @@ static void netconfig_ipv4_ifaddr_add_cmd_cb(int error, uint16_t type,
 	dns = netconfig_ipv4_get_dns(netconfig, netconfig->rtm_protocol);
 	if (!dns) {
 		l_error("netconfig: Failed to obtain DNS addresses.");
-		goto done;
+		goto domain_name;
 	}
 
 	resolve_add_dns(netconfig->ifindex, ifaddr->family, dns);
 	l_strv_free(dns);
 
+domain_name:
+	domain_name = netconfig_ipv4_get_domain_name(netconfig,
+						netconfig->rtm_protocol);
+	if (!domain_name)
+		goto done;
+
+	resolve_add_domain_name(netconfig->ifindex, domain_name);
+	l_free(domain_name);
+
 done:
 	netconfig_ifaddr_destroy(ifaddr);
 }
-- 
2.13.6

[PATCH v2 2/2] resolve: Add systemd-resolved domain name installer

[Tim Kourt]

[-- Attachment #1: Type: text/plain, Size: 3768 bytes --]

---
 src/resolve.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/resolve.h |  1 +
 2 files changed, 83 insertions(+)

diff --git a/src/resolve.c b/src/resolve.c
index 387e0b3c..0c06d521 100644
--- a/src/resolve.c
+++ b/src/resolve.c
@@ -42,6 +42,8 @@ struct resolve_method_ops {
 	void (*exit)(void *data);
 	void (*add_dns)(uint32_t ifindex, uint8_t type, char **dns_list,
 								void *data);
+	void (*add_domain_name)(uint32_t ifindex, char *domain_name,
+								void *data);
 	void (*remove)(uint32_t ifindex, void *data);
 };
 
@@ -177,6 +179,74 @@ static void resolve_systemd_add_dns(uint32_t ifindex, uint8_t type,
 								state, NULL);
 }
 
+static void systemd_link_add_domains_reply(struct l_dbus_message *message,
+								void *user_data)
+{
+	const char *name;
+	const char *text;
+
+	if (!l_dbus_message_is_error(message))
+		return;
+
+	l_dbus_message_get_error(message, &name, &text);
+
+	l_error("resolve-systemd: Failed to modify the domain entries. %s: %s",
+								name, text);
+}
+
+static void resolve_systemd_add_domain_name(uint32_t ifindex, char *domain_name,
+								void *data)
+{
+	struct systemd_state *state = data;
+	struct l_dbus_message_builder *builder;
+	struct l_dbus_message *message;
+	bool routing_domain;
+
+	l_debug("ifindex: %u", ifindex);
+
+	if (!state->is_ready) {
+		l_error("resolve-systemd: Failed to add domain name. "
+				"Is 'systemd-resolved' service running?");
+
+		return;
+	}
+
+	message =
+		l_dbus_message_new_method_call(dbus_get_bus(),
+					SYSTEMD_RESOLVED_SERVICE,
+					SYSTEMD_RESOLVED_MANAGER_PATH,
+					SYSTEMD_RESOLVED_MANAGER_INTERFACE,
+					"SetLinkDomains");
+
+	if (!message)
+		return;
+
+	builder = l_dbus_message_builder_new(message);
+	if (!builder) {
+		l_dbus_message_unref(message);
+		return;
+	}
+
+	routing_domain = true;
+
+	l_dbus_message_builder_append_basic(builder, 'i', &ifindex);
+
+	l_dbus_message_builder_enter_array(builder, "(sb)");
+
+	l_dbus_message_builder_enter_struct(builder, "sb");
+	l_dbus_message_builder_append_basic(builder, 's', domain_name);
+	l_dbus_message_builder_append_basic(builder, 'b', &routing_domain);
+	l_dbus_message_builder_leave_struct(builder);
+
+	l_dbus_message_builder_leave_array(builder);
+
+	l_dbus_message_builder_finalize(builder);
+	l_dbus_message_builder_destroy(builder);
+
+	l_dbus_send_with_reply(dbus_get_bus(), message,
+				systemd_link_add_domains_reply, state, NULL);
+}
+
 static void resolve_systemd_remove(uint32_t ifindex, void *data)
 {
 	struct systemd_state *state = data;
@@ -249,6 +319,7 @@ static const struct resolve_method_ops resolve_method_systemd = {
 	.init = resolve_systemd_init,
 	.exit = resolve_systemd_exit,
 	.add_dns = resolve_systemd_add_dns,
+	.add_domain_name = resolve_systemd_add_domain_name,
 	.remove = resolve_systemd_remove,
 };
 
@@ -376,6 +447,17 @@ void resolve_add_dns(uint32_t ifindex, uint8_t type, char **dns_list)
 	method.ops->add_dns(ifindex, type, dns_list, method.data);
 }
 
+void resolve_add_domain_name(uint32_t ifindex, char *domain_name)
+{
+	if (!domain_name)
+		return;
+
+	if (!method.ops || !method.ops->add_dns)
+		return;
+
+	method.ops->add_domain_name(ifindex, domain_name, method.data);
+}
+
 void resolve_remove(uint32_t ifindex)
 {
 	if (!method.ops || !method.ops->remove)
diff --git a/src/resolve.h b/src/resolve.h
index b0335868..68aaa7d6 100644
--- a/src/resolve.h
+++ b/src/resolve.h
@@ -21,4 +21,5 @@
  */
 
 void resolve_add_dns(uint32_t ifindex, uint8_t type, char **dns_list);
+void resolve_add_domain_name(uint32_t ifindex, char *domain_name);
 void resolve_remove(uint32_t ifindex);
-- 
2.13.6