示例#1
0
NMIP4Config *
nm_dhcp_utils_ip4_config_from_options (int ifindex,
                                       const char *iface,
                                       GHashTable *options,
                                       guint32 priority)
{
	NMIP4Config *ip4_config = NULL;
	guint32 tmp_addr;
	in_addr_t addr;
	NMPlatformIP4Address address;
	char *str = NULL;
	guint32 gwaddr = 0;
	guint8 plen = 0;

	g_return_val_if_fail (options != NULL, NULL);

	ip4_config = nm_ip4_config_new (ifindex);
	memset (&address, 0, sizeof (address));
	address.timestamp = nm_utils_get_monotonic_timestamp_s ();

	str = g_hash_table_lookup (options, "ip_address");
	if (str && (inet_pton (AF_INET, str, &addr) > 0))
		nm_log_info (LOGD_DHCP4, "  address %s", str);
	else
		goto error;

	str = g_hash_table_lookup (options, "subnet_mask");
	if (str && (inet_pton (AF_INET, str, &tmp_addr) > 0)) {
		plen = nm_utils_ip4_netmask_to_prefix (tmp_addr);
		nm_log_info (LOGD_DHCP4, "  plen %d (%s)", plen, str);
	} else {
		/* Get default netmask for the IP according to appropriate class. */
		plen = nm_utils_ip4_get_default_prefix (addr);
		nm_log_info (LOGD_DHCP4, "  plen %d (default)", plen);
	}
	nm_platform_ip4_address_set_addr (&address, addr, plen);

	/* Routes: if the server returns classless static routes, we MUST ignore
	 * the 'static_routes' option.
	 */
	if (!ip4_process_classless_routes (options, priority, ip4_config, &gwaddr))
		process_classful_routes (options, priority, ip4_config);

	if (gwaddr) {
		nm_log_info (LOGD_DHCP4, "  gateway %s", nm_utils_inet4_ntop (gwaddr, NULL));
		nm_ip4_config_set_gateway (ip4_config, gwaddr);
	} else {
		/* If the gateway wasn't provided as a classless static route with a
		 * subnet length of 0, try to find it using the old-style 'routers' option.
		 */
		str = g_hash_table_lookup (options, "routers");
		if (str) {
			char **routers = g_strsplit (str, " ", 0);
			char **s;

			for (s = routers; *s; s++) {
				/* FIXME: how to handle multiple routers? */
				if (inet_pton (AF_INET, *s, &gwaddr) > 0) {
					nm_ip4_config_set_gateway (ip4_config, gwaddr);
					nm_log_info (LOGD_DHCP4, "  gateway %s", *s);
					break;
				} else
					nm_log_warn (LOGD_DHCP4, "ignoring invalid gateway '%s'", *s);
			}
			g_strfreev (routers);
		}
	}

	/*
	 * RFC 2132, section 9.7
	 *   DHCP clients use the contents of the 'server identifier' field
	 *   as the destination address for any DHCP messages unicast to
	 *   the DHCP server.
	 *
	 * Some ISP's provide leases from central servers that are on
	 * different subnets that the address offered.  If the host
	 * does not configure the interface as the default route, the
	 * dhcp server may not be reachable via unicast, and a host
	 * specific route is needed.
	 **/
	str = g_hash_table_lookup (options, "dhcp_server_identifier");
	if (str) {
		if (inet_pton (AF_INET, str, &tmp_addr) > 0) {

			nm_log_info (LOGD_DHCP4, "  server identifier %s", str);
			if (   nm_utils_ip4_address_clear_host_address(tmp_addr, address.plen) != nm_utils_ip4_address_clear_host_address(address.address, address.plen)
			    && !nm_ip4_config_get_direct_route_for_host (ip4_config, tmp_addr)) {
				/* DHCP server not on assigned subnet and the no direct route was returned. Add route */
				NMPlatformIP4Route route = { 0 };

				route.network = tmp_addr;
				route.plen = 32;
				/* this will be a device route if gwaddr is 0 */
				route.gateway = gwaddr;
				route.source = NM_IP_CONFIG_SOURCE_DHCP;
				route.metric = priority;
				nm_ip4_config_add_route (ip4_config, &route);
				nm_log_dbg (LOGD_IP, "adding route for server identifier: %s",
				                      nm_platform_ip4_route_to_string (&route, NULL, 0));
			}
		}
		else
			nm_log_warn (LOGD_DHCP4, "ignoring invalid server identifier '%s'", str);
	}

	str = g_hash_table_lookup (options, "dhcp_lease_time");
	if (str) {
		address.lifetime = address.preferred = strtoul (str, NULL, 10);
		nm_log_info (LOGD_DHCP4, "  lease time %u", address.lifetime);
	}

	address.source = NM_IP_CONFIG_SOURCE_DHCP;
	nm_ip4_config_add_address (ip4_config, &address);

	str = g_hash_table_lookup (options, "host_name");
	if (str)
		nm_log_info (LOGD_DHCP4, "  hostname '%s'", str);

	str = g_hash_table_lookup (options, "domain_name_servers");
	if (str) {
		char **dns = g_strsplit (str, " ", 0);
		char **s;

		for (s = dns; *s; s++) {
			if (inet_pton (AF_INET, *s, &tmp_addr) > 0) {
				if (tmp_addr) {
					nm_ip4_config_add_nameserver (ip4_config, tmp_addr);
					nm_log_info (LOGD_DHCP4, "  nameserver '%s'", *s);
				}
			} else
				nm_log_warn (LOGD_DHCP4, "ignoring invalid nameserver '%s'", *s);
		}
		g_strfreev (dns);
	}

	str = g_hash_table_lookup (options, "domain_name");
	if (str) {
		char **domains = g_strsplit (str, " ", 0);
		char **s;

		for (s = domains; *s; s++) {
			nm_log_info (LOGD_DHCP4, "  domain name '%s'", *s);
			nm_ip4_config_add_domain (ip4_config, *s);
		}
		g_strfreev (domains);
	}

	str = g_hash_table_lookup (options, "domain_search");
	if (str)
		process_domain_search (str, ip4_add_domain_search, ip4_config);

	str = g_hash_table_lookup (options, "netbios_name_servers");
	if (str) {
		char **nbns = g_strsplit (str, " ", 0);
		char **s;

		for (s = nbns; *s; s++) {
			if (inet_pton (AF_INET, *s, &tmp_addr) > 0) {
				if (tmp_addr) {
					nm_ip4_config_add_wins (ip4_config, tmp_addr);
					nm_log_info (LOGD_DHCP4, "  wins '%s'", *s);
				}
			} else
				nm_log_warn (LOGD_DHCP4, "ignoring invalid WINS server '%s'", *s);
		}
		g_strfreev (nbns);
	}

	str = g_hash_table_lookup (options, "interface_mtu");
	if (str) {
		int int_mtu;

		errno = 0;
		int_mtu = strtol (str, NULL, 10);
		if ((errno == EINVAL) || (errno == ERANGE))
			goto error;

		if (int_mtu > 576)
			nm_ip4_config_set_mtu (ip4_config, int_mtu, NM_IP_CONFIG_SOURCE_DHCP);
	}

	str = g_hash_table_lookup (options, "nis_domain");
	if (str) {
		nm_log_info (LOGD_DHCP4, "  NIS domain '%s'", str);
		nm_ip4_config_set_nis_domain (ip4_config, str);
	}

	str = g_hash_table_lookup (options, "nis_servers");
	if (str) {
		char **nis = g_strsplit (str, " ", 0);
		char **s;

		for (s = nis; *s; s++) {
			if (inet_pton (AF_INET, *s, &tmp_addr) > 0) {
				if (tmp_addr) {
					nm_ip4_config_add_nis_server (ip4_config, tmp_addr);
					nm_log_info (LOGD_DHCP4, "  nis '%s'", *s);
				}
			} else
				nm_log_warn (LOGD_DHCP4, "ignoring invalid NIS server '%s'", *s);
		}
		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:
	g_object_unref (ip4_config);
	return NULL;
}
/* Given a table of DHCP options from the client, convert into an IP4Config */
static NMIP4Config *
ip4_options_to_config (NMDHCPClient *self)
{
	NMDHCPClientPrivate *priv;
	NMIP4Config *ip4_config = NULL;
	struct in_addr tmp_addr;
	NMIP4Address *addr = NULL;
	char *str = NULL;
	guint32 gwaddr = 0, prefix = 0;

	g_return_val_if_fail (self != NULL, NULL);
	g_return_val_if_fail (NM_IS_DHCP_CLIENT (self), NULL);

	priv = NM_DHCP_CLIENT_GET_PRIVATE (self);
	g_return_val_if_fail (priv->options != NULL, NULL);

	ip4_config = nm_ip4_config_new ();
	if (!ip4_config) {
		nm_log_warn (LOGD_DHCP4, "(%s): couldn't allocate memory for an IP4Config!", priv->iface);
		return NULL;
	}

	addr = nm_ip4_address_new ();
	if (!addr) {
		nm_log_warn (LOGD_DHCP4, "(%s): couldn't allocate memory for an IP4 Address!", priv->iface);
		goto error;
	}

	str = g_hash_table_lookup (priv->options, "new_ip_address");
	if (str && (inet_pton (AF_INET, str, &tmp_addr) > 0)) {
		nm_ip4_address_set_address (addr, tmp_addr.s_addr);
		nm_log_info (LOGD_DHCP4, "  address %s", str);
	} else
		goto error;

	str = g_hash_table_lookup (priv->options, "new_subnet_mask");
	if (str && (inet_pton (AF_INET, str, &tmp_addr) > 0)) {
		prefix = nm_utils_ip4_netmask_to_prefix (tmp_addr.s_addr);
		nm_log_info (LOGD_DHCP4, "  prefix %d (%s)", prefix, str);
	} else {
		/* Get default netmask for the IP according to appropriate class. */
		prefix = nm_utils_ip4_get_default_prefix (nm_ip4_address_get_address (addr));
		nm_log_info (LOGD_DHCP4, "  prefix %d (default)", prefix);
	}
	nm_ip4_address_set_prefix (addr, prefix);

	/* Routes: if the server returns classless static routes, we MUST ignore
	 * the 'static_routes' option.
	 */
	if (!ip4_process_classless_routes (priv->options, ip4_config, &gwaddr))
		process_classful_routes (priv->options, ip4_config);

	if (gwaddr) {
		char buf[INET_ADDRSTRLEN + 1];

		inet_ntop (AF_INET, &gwaddr, buf, sizeof (buf));
		nm_log_info (LOGD_DHCP4, "  gateway %s", buf);
		nm_ip4_address_set_gateway (addr, gwaddr);
	} else {
		/* If the gateway wasn't provided as a classless static route with a
		 * subnet length of 0, try to find it using the old-style 'routers' option.
		 */
		str = g_hash_table_lookup (priv->options, "new_routers");
		if (str) {
			char **routers = g_strsplit (str, " ", 0);
			char **s;

			for (s = routers; *s; s++) {
				/* FIXME: how to handle multiple routers? */
				if (inet_pton (AF_INET, *s, &tmp_addr) > 0) {
					nm_ip4_address_set_gateway (addr, tmp_addr.s_addr);
					nm_log_info (LOGD_DHCP4, "  gateway %s", *s);
					break;
				} else
					nm_log_warn (LOGD_DHCP4, "ignoring invalid gateway '%s'", *s);
			}
			g_strfreev (routers);
		}
	}

	nm_ip4_config_take_address (ip4_config, addr);
	addr = NULL;

	str = g_hash_table_lookup (priv->options, "new_host_name");
	if (str)
		nm_log_info (LOGD_DHCP4, "  hostname '%s'", str);

	str = g_hash_table_lookup (priv->options, "new_domain_name_servers");
	if (str) {
		char **searches = g_strsplit (str, " ", 0);
		char **s;

		for (s = searches; *s; s++) {
			if (inet_pton (AF_INET, *s, &tmp_addr) > 0) {
				nm_ip4_config_add_nameserver (ip4_config, tmp_addr.s_addr);
				nm_log_info (LOGD_DHCP4, "  nameserver '%s'", *s);
			} else
				nm_log_warn (LOGD_DHCP4, "ignoring invalid nameserver '%s'", *s);
		}
		g_strfreev (searches);
	}

	str = g_hash_table_lookup (priv->options, "new_domain_name");
	if (str) {
		char **domains = g_strsplit (str, " ", 0);
		char **s;

		for (s = domains; *s; s++) {
			nm_log_info (LOGD_DHCP4, "  domain name '%s'", *s);
			nm_ip4_config_add_domain (ip4_config, *s);
		}
		g_strfreev (domains);
	}

	str = g_hash_table_lookup (priv->options, "new_domain_search");
	if (str)
		process_domain_search (str, ip4_add_domain_search, ip4_config);

	str = g_hash_table_lookup (priv->options, "new_netbios_name_servers");
	if (str) {
		char **searches = g_strsplit (str, " ", 0);
		char **s;

		for (s = searches; *s; s++) {
			if (inet_pton (AF_INET, *s, &tmp_addr) > 0) {
				nm_ip4_config_add_wins (ip4_config, tmp_addr.s_addr);
				nm_log_info (LOGD_DHCP4, "  wins '%s'", *s);
			} else
				nm_log_warn (LOGD_DHCP4, "ignoring invalid WINS server '%s'", *s);
		}
		g_strfreev (searches);
	}

	str = g_hash_table_lookup (priv->options, "new_interface_mtu");
	if (str) {
		int int_mtu;

		errno = 0;
		int_mtu = strtol (str, NULL, 10);
		if ((errno == EINVAL) || (errno == ERANGE))
			goto error;

		if (int_mtu > 576)
			nm_ip4_config_set_mtu (ip4_config, int_mtu);
	}

	str = g_hash_table_lookup (priv->options, "new_nis_domain");
	if (str) {
		nm_log_info (LOGD_DHCP4, "  NIS domain '%s'", str);
		nm_ip4_config_set_nis_domain (ip4_config, str);
	}

	str = g_hash_table_lookup (priv->options, "new_nis_servers");
	if (str) {
		char **searches = g_strsplit (str, " ", 0);
		char **s;

		for (s = searches; *s; s++) {
			if (inet_pton (AF_INET, *s, &tmp_addr) > 0) {
				nm_ip4_config_add_nis_server (ip4_config, tmp_addr.s_addr);
				nm_log_info (LOGD_DHCP4, "  nis '%s'", *s);
			} else
				nm_log_warn (LOGD_DHCP4, "ignoring invalid NIS server '%s'", *s);
		}
		g_strfreev (searches);
	}

	return ip4_config;

error:
	if (addr)
		nm_ip4_address_unref (addr);
	g_object_unref (ip4_config);
	return NULL;
}