nm-dhcp-nettools.c 42.1 KB
Newer Older
Lubomir Rintel's avatar
Lubomir Rintel committed
1
// SPDX-License-Identifier: LGPL-2.1+
2
/*
3
 * Copyright (C) 2014 - 2019 Red Hat, Inc.
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
 */

#include "nm-default.h"

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <net/if_arp.h>

#include "nm-sd-adapt-shared.h"
#include "hostname-util.h"

#include "nm-glib-aux/nm-dedup-multi.h"
#include "nm-std-aux/unaligned.h"

#include "nm-utils.h"
#include "nm-config.h"
#include "nm-dhcp-utils.h"
25
#include "nm-dhcp-options.h"
26 27 28 29 30
#include "nm-core-utils.h"
#include "NetworkManagerUtils.h"
#include "platform/nm-platform.h"
#include "nm-dhcp-client-logging.h"
#include "n-dhcp4/src/n-dhcp4.h"
31
#include "systemd/nm-sd-utils-shared.h"
32
#include "systemd/nm-sd-utils-dhcp.h"
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53

/*****************************************************************************/

#define NM_TYPE_DHCP_NETTOOLS            (nm_dhcp_nettools_get_type ())
#define NM_DHCP_NETTOOLS(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), NM_TYPE_DHCP_NETTOOLS, NMDhcpNettools))
#define NM_DHCP_NETTOOLS_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), NM_TYPE_DHCP_NETTOOLS, NMDhcpNettoolsClass))
#define NM_IS_DHCP_NETTOOLS(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), NM_TYPE_DHCP_NETTOOLS))
#define NM_IS_DHCP_NETTOOLS_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), NM_TYPE_DHCP_NETTOOLS))
#define NM_DHCP_NETTOOLS_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), NM_TYPE_DHCP_NETTOOLS, NMDhcpNettoolsClass))

typedef struct _NMDhcpNettools NMDhcpNettools;
typedef struct _NMDhcpNettoolsClass NMDhcpNettoolsClass;

/*****************************************************************************/

typedef struct {
	NDhcp4Client *client;
	NDhcp4ClientProbe *probe;
	NDhcp4ClientLease *lease;
	GIOChannel *channel;
	guint event_id;
54
	char *lease_file;
55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
} NMDhcpNettoolsPrivate;

struct _NMDhcpNettools {
	NMDhcpClient parent;
	NMDhcpNettoolsPrivate _priv;
};

struct _NMDhcpNettoolsClass {
	NMDhcpClientClass parent;
};

G_DEFINE_TYPE (NMDhcpNettools, nm_dhcp_nettools, NM_TYPE_DHCP_CLIENT)

#define NM_DHCP_NETTOOLS_GET_PRIVATE(self) _NM_GET_PRIVATE (self, NMDhcpNettools, NM_IS_DHCP_NETTOOLS)

/*****************************************************************************/

72 73
#define DHCP_MAX_FQDN_LENGTH 255

74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130
enum {
	NM_IN_ADDR_CLASS_A,
	NM_IN_ADDR_CLASS_B,
	NM_IN_ADDR_CLASS_C,
	NM_IN_ADDR_CLASS_INVALID,
};

static int
in_addr_class (struct in_addr addr)
{
	switch (ntohl (addr.s_addr) >> 24) {
	case   0 ... 127:
		return NM_IN_ADDR_CLASS_A;
	case 128 ... 191:
		return NM_IN_ADDR_CLASS_B;
	case 192 ... 223:
		return NM_IN_ADDR_CLASS_C;
	default:
		return NM_IN_ADDR_CLASS_INVALID;
	}
}

static gboolean
lease_option_consume (void *out,
                      size_t n_out,
                      uint8_t **datap,
                      size_t *n_datap)
{
	if (*n_datap < n_out)
		return FALSE;

	memcpy (out, *datap, n_out);
	*datap += n_out;
	*n_datap -= n_out;
	return TRUE;
}

static gboolean
lease_option_next_in_addr (struct in_addr *addrp,
                           uint8_t **datap,
                           size_t *n_datap)
{
	return lease_option_consume (addrp, sizeof (struct in_addr), datap, n_datap);
}

static gboolean
lease_option_next_route (struct in_addr *destp,
                         uint8_t *plenp,
                         struct in_addr *gatewayp,
                         gboolean classless,
                         uint8_t **datap,
                         size_t *n_datap)
{
	struct in_addr dest = {}, gateway;
	uint8_t *data = *datap;
	size_t n_data = *n_datap;
	uint8_t plen;
131
	uint8_t bytes;
132 133 134 135 136 137 138 139

	if (classless) {
		if (!lease_option_consume (&plen, sizeof (plen), &data, &n_data))
			return FALSE;

		if (plen > 32)
			return FALSE;

140 141 142
		bytes = plen == 0 ? 0 : ((plen - 1) / 8) + 1;

		if (!lease_option_consume (&dest, bytes, &data, &n_data))
143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251
			return FALSE;
	} else {
		if (!lease_option_next_in_addr (&dest, &data, &n_data))
			return FALSE;

		switch (in_addr_class (dest)) {
		case NM_IN_ADDR_CLASS_A:
			plen = 8;
			break;
		case NM_IN_ADDR_CLASS_B:
			plen = 16;
			break;
		case NM_IN_ADDR_CLASS_C:
			plen = 24;
			break;
		case NM_IN_ADDR_CLASS_INVALID:
			return FALSE;
		}
	}

	dest.s_addr = nm_utils_ip4_address_clear_host_address (dest.s_addr, plen);

	if (!lease_option_next_in_addr (&gateway, &data, &n_data))
		return FALSE;

	*destp = dest;
	*plenp = plen;
	*gatewayp = gateway;
	*datap = data;
	*n_datap = n_data;
	return TRUE;
}

static gboolean
lease_option_print_label (GString *str, size_t n_label, uint8_t **datap, size_t *n_datap)
{
	for (size_t i = 0; i < n_label; ++i) {
		uint8_t c;

		if (!lease_option_consume(&c, sizeof (c), datap, n_datap))
			return FALSE;

		switch (c) {
                case 'a' ... 'z':
                case 'A' ... 'Z':
		case '0' ... '9':
                case '-':
		case '_':
			g_string_append_c(str, c);
			break;
		case '.':
		case '\\':
			g_string_append_printf(str, "\\%c", c);
			break;
		default:
			g_string_append_printf(str, "\\%3d", c);
		}
	}

	return TRUE;
}

static gboolean
lease_option_print_domain_name (GString *str, uint8_t *cache, size_t *n_cachep, uint8_t **datap, size_t *n_datap)
{
	uint8_t *domain;
	size_t n_domain, n_cache = *n_cachep;
	uint8_t **domainp = datap;
	size_t *n_domainp = n_datap;
	gboolean first = TRUE;
	uint8_t c;

	/*
	 * We are given two adjacent memory regions. The @cache contains alreday parsed
	 * domain names, and the @datap contains the remaining data to parse.
	 *
	 * A domain name is formed from a sequence of labels. Each label start with
	 * a length byte, where the two most significant bits are unset. A zero-length
	 * label indicates the end of the domain name.
	 *
	 * Alternatively, a label can be followed by an offset (indicated by the two
	 * most significant bits being set in the next byte that is read). The offset
	 * is an offset into the cache, where the next label of the domain name can
	 * be found.
	 *
	 * Note, that each time a jump to an offset is performed, the size of the
	 * cache shrinks, so this is guaranteed to terminate.
	 */
	if (cache + n_cache != *datap)
		return FALSE;

	for (;;) {
		if (!lease_option_consume(&c, sizeof (c), domainp, n_domainp))
			return FALSE;

		switch (c & 0xC0) {
		case 0x00: /* label length */
		{
			size_t n_label = c;

			if (n_label == 0) {
				/*
				 * We reached the final label of the domain name. Adjust
				 * the cache to include the consumed data, and return.
				 */
				*n_cachep = *datap - cache;
				return TRUE;
			}

252
			if (!first)
253
				g_string_append_c(str, '.');
254
			else
255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348
				first = FALSE;

			if (!lease_option_print_label (str, n_label, domainp, n_domainp))
				return FALSE;

			break;
		}
		case 0xC0: /* back pointer */
		{
			size_t offset = (c & 0x3F) << 16;

			/*
			 * The offset is given as two bytes (in big endian), where the
			 * two high bits are masked out.
			 */

			if (!lease_option_consume (&c, sizeof (c), domainp, n_domainp))
				return FALSE;

			offset += c;

			if (offset >= n_cache)
				return FALSE;

			domain = cache + offset;
			n_domain = n_cache - offset;
			n_cache = offset;

			domainp = &domain;
			n_domainp = &n_domain;

			break;
		}
		default:
			return FALSE;
		}
	}
}

static gboolean
lease_get_in_addr (NDhcp4ClientLease *lease,
                   guint8 option,
                   struct in_addr *addrp) {
	struct in_addr addr;
	uint8_t *data;
	size_t n_data;
	int r;

	r = n_dhcp4_client_lease_query (lease, option, &data, &n_data);
	if (r)
		return FALSE;

	if (!lease_option_next_in_addr (&addr, &data, &n_data))
		return FALSE;

	if (n_data != 0)
		return FALSE;

	*addrp = addr;
	return TRUE;
}

static gboolean
lease_get_u16 (NDhcp4ClientLease *lease,
               uint8_t option,
               uint16_t *u16p)
{
	uint8_t *data;
	size_t n_data;
	uint16_t be16;
	int r;

	r = n_dhcp4_client_lease_query (lease, option, &data, &n_data);
	if (r)
		return FALSE;

	if (n_data != sizeof (be16))
		return FALSE;

	memcpy (&be16, data, sizeof (be16));

	*u16p = ntohs(be16);
	return TRUE;
}

static gboolean
lease_parse_address (NDhcp4ClientLease *lease,
                     NMIP4Config *ip4_config,
                     GHashTable *options,
                     GError **error)
{
	char addr_str[NM_UTILS_INET_ADDRSTRLEN];
	struct in_addr a_address;
	struct in_addr a_netmask;
349
	struct in_addr a_next_server;
350
	guint32 a_plen;
351
	guint64 nettools_lifetime;
352 353 354
	guint32 a_lifetime;
	guint32 a_timestamp;
	guint64 a_expiry;
355 356

	n_dhcp4_client_lease_get_yiaddr (lease, &a_address);
357 358 359 360 361
	if (a_address.s_addr == INADDR_ANY) {
		nm_utils_error_set_literal (error, NM_UTILS_ERROR_UNKNOWN, "could not get address from lease");
		return FALSE;
	}

362
	n_dhcp4_client_lease_get_lifetime (lease, &nettools_lifetime);
363

364
	if (nettools_lifetime == G_MAXUINT64) {
365
		a_timestamp = 0;
366
		a_lifetime = NM_PLATFORM_LIFETIME_PERMANENT;
367
		a_expiry = G_MAXUINT64;
368
	} else {
369 370 371 372 373 374 375 376 377 378
		guint64 nettools_basetime;
		guint64 lifetime;
		gint64 ts;

		n_dhcp4_client_lease_get_basetime (lease, &nettools_basetime);

		/* usually we shouldn't assert against external libraries like n-dhcp4.
		 * Here we still do it... it seems safe enough. */
		nm_assert (nettools_basetime > 0);
		nm_assert (nettools_lifetime >= nettools_basetime);
379 380
		nm_assert (((nettools_lifetime - nettools_basetime) % NM_UTILS_NSEC_PER_SEC) == 0);
		nm_assert ((nettools_lifetime - nettools_basetime) / NM_UTILS_NSEC_PER_SEC <= G_MAXUINT32);
381 382 383 384 385 386 387 388 389

		if (nettools_lifetime <= nettools_basetime) {
			/* A lease time of 0 is allowed on some dhcp servers, so, let's accept it. */
			lifetime = 0;
		} else {
			lifetime = nettools_lifetime - nettools_basetime;

			/* we "ceil" the value to the next second. In practice, we don't expect any sub-second values
			 * from n-dhcp4 anyway, so this should have no effect. */
390
			lifetime += NM_UTILS_NSEC_PER_SEC - 1;
391 392 393
		}

		ts = nm_utils_monotonic_timestamp_from_boottime (nettools_basetime, 1);
394

395 396 397
		/* the timestamp must be positive, because we only started nettools DHCP client
		 * after obtaining the first monotonic timestamp. Hence, the lease must have been
		 * received afterwards. */
398
		nm_assert (ts >= NM_UTILS_NSEC_PER_SEC);
399

400 401 402
		a_timestamp = ts / NM_UTILS_NSEC_PER_SEC;
		a_lifetime = NM_MIN (lifetime / NM_UTILS_NSEC_PER_SEC, NM_PLATFORM_LIFETIME_PERMANENT - 1);
		a_expiry = time (NULL) + ((lifetime - (nm_utils_clock_gettime_ns (CLOCK_BOOTTIME) - nettools_basetime)) / NM_UTILS_NSEC_PER_SEC);
403
	}
404

405
	if (!lease_get_in_addr (lease, NM_DHCP_OPTION_DHCP4_SUBNET_MASK, &a_netmask)) {
406 407 408 409 410 411 412
		nm_utils_error_set_literal (error, NM_UTILS_ERROR_UNKNOWN, "could not get netmask from lease");
		return FALSE;
	}

	nm_utils_inet4_ntop (a_address.s_addr, addr_str);
	a_plen = nm_utils_ip4_netmask_to_prefix (a_netmask.s_addr);

413 414 415 416 417 418 419 420
	nm_dhcp_option_add_option (options,
	                           _nm_dhcp_option_dhcp4_options,
	                           NM_DHCP_OPTION_DHCP4_NM_IP_ADDRESS,
	                           addr_str);
	nm_dhcp_option_add_option (options,
	                           _nm_dhcp_option_dhcp4_options,
	                           NM_DHCP_OPTION_DHCP4_SUBNET_MASK,
	                           nm_utils_inet4_ntop (a_netmask.s_addr, addr_str));
421

422 423 424
	nm_dhcp_option_add_option_u64 (options,
	                               _nm_dhcp_option_dhcp4_options,
	                               NM_DHCP_OPTION_DHCP4_IP_ADDRESS_LEASE_TIME,
425 426
	                               (guint64) a_lifetime);

427
	if (a_expiry != G_MAXUINT64) {
428 429 430
		nm_dhcp_option_add_option_u64 (options,
		                               _nm_dhcp_option_dhcp4_options,
		                               NM_DHCP_OPTION_DHCP4_NM_EXPIRY,
431
		                               a_expiry);
432
	}
433

434 435 436 437 438 439 440 441 442 443

	n_dhcp4_client_lease_get_siaddr (lease, &a_next_server);
	if (a_next_server.s_addr != INADDR_ANY) {
		nm_utils_inet4_ntop (a_next_server.s_addr, addr_str);
		nm_dhcp_option_add_option (options,
		                           _nm_dhcp_option_dhcp4_options,
		                           NM_DHCP_OPTION_DHCP4_NM_NEXT_SERVER,
		                           addr_str);
	}

444 445 446 447 448 449
	nm_ip4_config_add_address (ip4_config,
	                           &((const NMPlatformIP4Address) {
	                                   .address      = a_address.s_addr,
	                                   .peer_address = a_address.s_addr,
	                                   .plen         = a_plen,
	                                   .addr_source  = NM_IP_CONFIG_SOURCE_DHCP,
450
	                                   .timestamp    = a_timestamp,
451 452
	                                   .lifetime     = a_lifetime,
	                                   .preferred    = a_lifetime,
453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469
	                           }));

	return TRUE;
}

static void
lease_parse_domain_name_servers (NDhcp4ClientLease *lease,
                                 NMIP4Config *ip4_config,
                                 GHashTable *options)
{
	nm_auto_free_gstring GString *str = NULL;
	char addr_str[NM_UTILS_INET_ADDRSTRLEN];
	struct in_addr addr;
	uint8_t *data;
	size_t n_data;
	int r;

470
	r = n_dhcp4_client_lease_query (lease, NM_DHCP_OPTION_DHCP4_DOMAIN_NAME_SERVER, &data, &n_data);
471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489
	if (r)
		return;

	nm_gstring_prepare (&str);

	while (lease_option_next_in_addr (&addr, &data, &n_data)) {

		nm_utils_inet4_ntop (addr.s_addr, addr_str);
		g_string_append (nm_gstring_add_space_delimiter (str), addr_str);

		if (   addr.s_addr == 0
		    || nm_ip4_addr_is_localhost (addr.s_addr)) {
			/* Skip localhost addresses, like also networkd does.
			 * See https://github.com/systemd/systemd/issues/4524. */
			continue;
		}
		nm_ip4_config_add_nameserver (ip4_config, addr.s_addr);
	}

490 491 492 493
	nm_dhcp_option_add_option (options,
	                           _nm_dhcp_option_dhcp4_options,
	                           NM_DHCP_OPTION_DHCP4_DOMAIN_NAME_SERVER,
	                           str->str);
494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515
}

static void
lease_parse_routes (NDhcp4ClientLease *lease,
                    NMIP4Config *ip4_config,
                    GHashTable *options,
                    guint32 route_table,
                    guint32 route_metric)
{
	nm_auto_free_gstring GString *str = NULL;
	char dest_str[NM_UTILS_INET_ADDRSTRLEN];
	char gateway_str[NM_UTILS_INET_ADDRSTRLEN];
	const char *s;
	struct in_addr dest, gateway;
	uint8_t plen;
	guint32 m;
	gboolean has_router_from_classless = FALSE, has_classless = FALSE;
	guint32 default_route_metric = route_metric;
	uint8_t *data;
	size_t n_data;
	int r;

516
	r = n_dhcp4_client_lease_query (lease, NM_DHCP_OPTION_DHCP4_CLASSLESS_STATIC_ROUTE, &data, &n_data);
517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555
	if (!r) {
		nm_gstring_prepare (&str);

		has_classless = TRUE;

		while (lease_option_next_route (&dest, &plen, &gateway, TRUE, &data, &n_data)) {

			nm_utils_inet4_ntop (dest.s_addr, dest_str);
			nm_utils_inet4_ntop (gateway.s_addr, gateway_str);

			g_string_append_printf (nm_gstring_add_space_delimiter (str),
			                        "%s/%d %s",
			                        dest_str,
			                        (int) plen,
			                        gateway_str);

			if (plen == 0) {
				/* if there are multiple default routes, we add them with differing
				 * metrics. */
				m = default_route_metric;
				if (default_route_metric < G_MAXUINT32)
					default_route_metric++;

				has_router_from_classless = TRUE;
			} else {
				m = route_metric;
                        }

			nm_ip4_config_add_route (ip4_config,
			                         &((const NMPlatformIP4Route) {
			                             .network       = dest.s_addr,
			                             .plen          = plen,
			                             .gateway       = gateway.s_addr,
			                             .rt_source     = NM_IP_CONFIG_SOURCE_DHCP,
			                             .metric        = m,
			                             .table_coerced = nm_platform_route_table_coerce (route_table),
			                         }),
			                         NULL);
		}
556 557 558 559
		nm_dhcp_option_add_option (options,
		                           _nm_dhcp_option_dhcp4_options,
		                           NM_DHCP_OPTION_DHCP4_CLASSLESS_STATIC_ROUTE,
		                           str->str);
560 561
	}

562
	r = n_dhcp4_client_lease_query (lease, NM_DHCP_OPTION_DHCP4_STATIC_ROUTE, &data, &n_data);
563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602
	if (!r) {
		nm_gstring_prepare (&str);

		while (lease_option_next_route (&dest, &plen, &gateway, FALSE, &data, &n_data)) {

			nm_utils_inet4_ntop (dest.s_addr, dest_str);
			nm_utils_inet4_ntop (gateway.s_addr, gateway_str);

			g_string_append_printf (nm_gstring_add_space_delimiter (str),
			                        "%s/%d %s",
			                        dest_str,
			                        (int) plen,
			                        gateway_str);

			if (has_classless) {
				/* RFC 3443: if the DHCP server returns both a Classless Static Routes
				 * option and a Static Routes option, the DHCP client MUST ignore the
				 * Static Routes option. */
				continue;
			}

			if (plen == 0) {
				/* for option 33 (static route), RFC 2132 says:
				 *
				 * The default route (0.0.0.0) is an illegal destination for a static
				 * route. */
				continue;
			}

			nm_ip4_config_add_route (ip4_config,
			                         &((const NMPlatformIP4Route) {
			                             .network       = dest.s_addr,
			                             .plen          = plen,
			                             .gateway       = gateway.s_addr,
			                             .rt_source     = NM_IP_CONFIG_SOURCE_DHCP,
			                             .metric        = route_metric,
			                             .table_coerced = nm_platform_route_table_coerce (route_table),
			                         }),
			                         NULL);
		}
603 604 605 606
		nm_dhcp_option_add_option (options,
		                           _nm_dhcp_option_dhcp4_options,
		                           NM_DHCP_OPTION_DHCP4_STATIC_ROUTE,
		                           str->str);
607 608
	}

609
	r = n_dhcp4_client_lease_query (lease, NM_DHCP_OPTION_DHCP4_ROUTER, &data, &n_data);
610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646
	if (!r) {
		nm_gstring_prepare (&str);

		while (lease_option_next_in_addr (&gateway, &data, &n_data)) {
			s = nm_utils_inet4_ntop (gateway.s_addr, gateway_str);
			g_string_append (nm_gstring_add_space_delimiter (str), s);

			if (gateway.s_addr == 0) {
				/* silently skip 0.0.0.0 */
				continue;
			}

			if (has_router_from_classless) {
				/* If the DHCP server returns both a Classless Static Routes option and a
				 * Router option, the DHCP client MUST ignore the Router option [RFC 3442].
				 *
				 * Be more lenient and ignore the Router option only if Classless Static
				 * Routes contain a default gateway (as other DHCP backends do).
				 */
				continue;
			}

			/* if there are multiple default routes, we add them with differing
			 * metrics. */
			m = default_route_metric;
			if (default_route_metric < G_MAXUINT32)
				default_route_metric++;

			nm_ip4_config_add_route (ip4_config,
			                         &((const NMPlatformIP4Route) {
			                                 .rt_source     = NM_IP_CONFIG_SOURCE_DHCP,
			                                 .gateway       = gateway.s_addr,
			                                 .table_coerced = nm_platform_route_table_coerce (route_table),
			                                 .metric        = m,
			                         }),
			                         NULL);
		}
647 648 649 650
		nm_dhcp_option_add_option (options,
		                           _nm_dhcp_option_dhcp4_options,
		                           NM_DHCP_OPTION_DHCP4_ROUTER,
		                           str->str);
651 652 653 654 655 656 657 658 659 660
	}
}

static void
lease_parse_mtu (NDhcp4ClientLease *lease,
                 NMIP4Config *ip4_config,
                 GHashTable *options)
{
	uint16_t mtu;

661
	if (!lease_get_u16 (lease, NM_DHCP_OPTION_DHCP4_INTERFACE_MTU, &mtu))
662 663 664 665 666
		return;

	if (mtu < 68)
		return;

667 668 669 670
	nm_dhcp_option_add_option_u64 (options,
	                               _nm_dhcp_option_dhcp4_options,
	                               NM_DHCP_OPTION_DHCP4_INTERFACE_MTU,
	                               mtu);
671 672 673 674 675 676 677 678 679 680 681 682 683
	nm_ip4_config_set_mtu (ip4_config, mtu, NM_IP_CONFIG_SOURCE_DHCP);
}

static void
lease_parse_metered (NDhcp4ClientLease *lease,
                     NMIP4Config *ip4_config,
                     GHashTable *options)
{
	gboolean metered = FALSE;
	uint8_t *data;
	size_t n_data;
	int r;

684
	r = n_dhcp4_client_lease_query (lease, NM_DHCP_OPTION_DHCP4_VENDOR_SPECIFIC, &data, &n_data);
685 686 687 688 689 690
	if (r) {
		metered = FALSE;
	} else {
		metered = !!memmem (data, n_data, "ANDROID_METERED", NM_STRLEN ("ANDROID_METERED"));
	}

691
	/* TODO: expose the vendor specific option when present */
692 693 694 695 696 697 698 699 700 701 702 703 704 705
	nm_ip4_config_set_metered (ip4_config, metered);
}

static void
lease_parse_ntps (NDhcp4ClientLease *lease,
                  GHashTable *options)
{
	nm_auto_free_gstring GString *str = NULL;
	char addr_str[NM_UTILS_INET_ADDRSTRLEN];
	struct in_addr addr;
	uint8_t *data;
	size_t n_data;
	int r;

706
	r = n_dhcp4_client_lease_query (lease, NM_DHCP_OPTION_DHCP4_NTP_SERVER, &data, &n_data);
707 708 709 710 711 712 713 714 715 716
	if (r)
		return;

	nm_gstring_prepare (&str);

	while (lease_option_next_in_addr (&addr, &data, &n_data)) {
		nm_utils_inet4_ntop (addr.s_addr, addr_str);
		g_string_append (nm_gstring_add_space_delimiter (str), addr_str);
	}

717 718 719 720
	nm_dhcp_option_add_option (options,
	                           _nm_dhcp_option_dhcp4_options,
	                           NM_DHCP_OPTION_DHCP4_NTP_SERVER,
	                           str->str);
721 722 723 724 725 726 727 728 729 730 731
}

static void
lease_parse_hostname (NDhcp4ClientLease *lease,
                      GHashTable *options)
{
	nm_auto_free_gstring GString *str = NULL;
	uint8_t *data;
	size_t n_data;
	int r;

732
	r = n_dhcp4_client_lease_query (lease, NM_DHCP_OPTION_DHCP4_HOST_NAME, &data, &n_data);
733 734 735 736 737 738 739 740
	if (r)
		return;

	str = g_string_new_len ((char *)data, n_data);

	if (is_localhost(str->str))
		return;

741 742 743 744
	nm_dhcp_option_add_option (options,
	                           _nm_dhcp_option_dhcp4_options,
	                           NM_DHCP_OPTION_DHCP4_HOST_NAME,
	                           str->str);
745 746 747 748 749 750 751 752 753 754 755 756 757
}

static void
lease_parse_domainname (NDhcp4ClientLease *lease,
                        NMIP4Config *ip4_config,
                        GHashTable *options)
{
	nm_auto_free_gstring GString *str = NULL;
	gs_strfreev char **domains = NULL;
	uint8_t *data;
	size_t n_data;
	int r;

758
	r = n_dhcp4_client_lease_query (lease, NM_DHCP_OPTION_DHCP4_DOMAIN_NAME, &data, &n_data);
759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774
	if (r)
		return;

	str = g_string_new_len ((char *)data, n_data);

	/* Multiple domains sometimes stuffed into option 15 "Domain Name". */
	domains = g_strsplit (str->str, " ", 0);
	nm_gstring_prepare (&str);

	for (char **d = domains; *d; d++) {
		if (is_localhost(*d))
			return;

		g_string_append (nm_gstring_add_space_delimiter (str), *d);
		nm_ip4_config_add_domain (ip4_config, *d);
	}
775 776 777 778
	nm_dhcp_option_add_option (options,
	                           _nm_dhcp_option_dhcp4_options,
	                           NM_DHCP_OPTION_DHCP4_DOMAIN_NAME,
	                           str->str);
779 780
}

781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809
char **
nm_dhcp_parse_search_list (guint8 *data, size_t n_data)
{
	GPtrArray *array = NULL;
	guint8 *cache = data;
	size_t n_cache = 0;

	for (;;) {
		nm_auto_free_gstring GString *domain = NULL;

		nm_gstring_prepare (&domain);

		if (!lease_option_print_domain_name (domain, cache, &n_cache, &data, &n_data))
			break;

		if (!array)
			array = g_ptr_array_new ();

		g_ptr_array_add (array, g_string_free (domain, FALSE));
		domain = NULL;
	}

	if (array) {
		g_ptr_array_add (array, NULL);
		return (char **) g_ptr_array_free (array, FALSE);
	} else
		return NULL;
}

810 811 812 813 814 815
static void
lease_parse_search_domains (NDhcp4ClientLease *lease,
                            NMIP4Config *ip4_config,
                            GHashTable *options)
{
	nm_auto_free_gstring GString *str = NULL;
816 817 818 819
	uint8_t *data;
	size_t n_data;
	gs_strfreev char **domains = NULL;
	guint i;
820 821
	int r;

822
	r = n_dhcp4_client_lease_query (lease, NM_DHCP_OPTION_DHCP4_DOMAIN_SEARCH_LIST, &data, &n_data);
823 824 825
	if (r)
		return;

826
	domains = nm_dhcp_parse_search_list (data, n_data);
827 828
	nm_gstring_prepare (&str);

829 830 831
	for (i = 0; domains && domains[i]; i++) {
		g_string_append (nm_gstring_add_space_delimiter (str), domains[i]);
		nm_ip4_config_add_search (ip4_config, domains[i]);
832
	}
833 834 835 836
	nm_dhcp_option_add_option (options,
	                           _nm_dhcp_option_dhcp4_options,
	                           NM_DHCP_OPTION_DHCP4_DOMAIN_SEARCH_LIST,
	                           str->str);
837 838 839 840 841 842 843 844 845 846 847
}

static void
lease_parse_root_path (NDhcp4ClientLease *lease,
                       GHashTable *options)
{
	nm_auto_free_gstring GString *str = NULL;
	uint8_t *data;
	size_t n_data;
	int r;

848
	r = n_dhcp4_client_lease_query (lease, NM_DHCP_OPTION_DHCP4_ROOT_PATH, &data, &n_data);
849 850 851 852
	if (r)
		return;

	str = g_string_new_len ((char *)data, n_data);
853 854 855 856
	nm_dhcp_option_add_option (options,
	                           _nm_dhcp_option_dhcp4_options,
	                           NM_DHCP_OPTION_DHCP4_ROOT_PATH,
	                           str->str);
857 858 859 860 861 862
}

static void
lease_parse_wpad (NDhcp4ClientLease *lease,
                  GHashTable *options)
{
863
	gs_free char *wpad = NULL;
864 865 866 867
	uint8_t *data;
	size_t n_data;
	int r;

868
	r = n_dhcp4_client_lease_query (lease, NM_DHCP_OPTION_DHCP4_PRIVATE_PROXY_AUTODISCOVERY, &data, &n_data);
869 870 871
	if (r)
		return;

872 873 874 875
	nm_utils_buf_utf8safe_escape ((char *)data, n_data, 0, &wpad);
	if (wpad == NULL)
		wpad = g_strndup ((char *)data, n_data);

876 877 878
	nm_dhcp_option_add_option (options,
	                           _nm_dhcp_option_dhcp4_options,
	                           NM_DHCP_OPTION_DHCP4_PRIVATE_PROXY_AUTODISCOVERY,
879
	                           wpad);
880 881
}

882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904
static void
lease_parse_private_options (NDhcp4ClientLease *lease,
                             GHashTable *options)
{
	int i;

	for (i = NM_DHCP_OPTION_DHCP4_PRIVATE_224; i <= NM_DHCP_OPTION_DHCP4_PRIVATE_254; i++) {
		gs_free char *option_string = NULL;
		guint8 *data;
		gsize n_data;
		int r;

		/* We manage private options 249 (private classless static route) and 252 (wpad) in a special
		 * way, so skip them as we here just manage all (the other) private options as raw data */
		if (NM_IN_SET (i, NM_DHCP_OPTION_DHCP4_PRIVATE_CLASSLESS_STATIC_ROUTE,
		                  NM_DHCP_OPTION_DHCP4_PRIVATE_PROXY_AUTODISCOVERY))
			continue;

		r = n_dhcp4_client_lease_query (lease, i, &data, &n_data);
		if (r)
			continue;

		option_string = nm_utils_bin2hexstr_full (data, n_data, ':', FALSE, NULL);
905 906 907 908
		nm_dhcp_option_take_option (options,
		                            _nm_dhcp_option_dhcp4_options,
		                            i,
		                            g_steal_pointer (&option_string));
909 910 911
	}
}

912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927
static NMIP4Config *
lease_to_ip4_config (NMDedupMultiIndex *multi_idx,
                     const char *iface,
                     int ifindex,
                     NDhcp4ClientLease *lease,
                     guint32 route_table,
                     guint32 route_metric,
                     GHashTable **out_options,
                     GError **error)
{
	gs_unref_object NMIP4Config *ip4_config = NULL;
	gs_unref_hashtable GHashTable *options = NULL;

	g_return_val_if_fail (lease != NULL, NULL);

	ip4_config = nm_ip4_config_new (multi_idx, ifindex);
928
	options = nm_dhcp_option_create_options_dict ();
929

930
	if (!lease_parse_address (lease, ip4_config, options, error))
931 932
		return NULL;

933 934 935 936 937 938 939 940 941 942 943 944
	lease_parse_routes (lease, ip4_config, options, route_table, route_metric);
	lease_parse_domain_name_servers (lease, ip4_config, options);
	lease_parse_domainname (lease, ip4_config, options);
	lease_parse_search_domains (lease, ip4_config, options);
	lease_parse_mtu (lease, ip4_config, options);
	lease_parse_metered (lease, ip4_config, options);

	lease_parse_hostname (lease, options);
	lease_parse_ntps (lease, options);
	lease_parse_root_path (lease, options);
	lease_parse_wpad (lease, options);
	lease_parse_private_options (lease, options);
945 946 947 948 949 950 951

	NM_SET_OUT (out_options, g_steal_pointer (&options));
	return g_steal_pointer (&ip4_config);
}

/*****************************************************************************/

952
static void
953
lease_save (NMDhcpNettools *self, NDhcp4ClientLease *lease, const char *lease_file)
954 955 956 957
{
	struct in_addr a_address;
	nm_auto_free_gstring GString *new_contents = NULL;
	char sbuf[NM_UTILS_INET_ADDRSTRLEN];
958
	gs_free_error GError *error = NULL;
959 960 961 962 963 964 965 966 967 968 969 970 971

	nm_assert (lease);
	nm_assert (lease_file);

	new_contents = g_string_new ("# This is private data. Do not parse.\n");

	n_dhcp4_client_lease_get_yiaddr (lease, &a_address);
	if (a_address.s_addr == INADDR_ANY)
		return;

	g_string_append_printf (new_contents,
	                        "ADDRESS=%s\n", nm_utils_inet4_ntop (a_address.s_addr, sbuf));

972 973 974 975 976
	if (!g_file_set_contents (lease_file,
	                          new_contents->str,
	                          -1,
	                          &error))
		_LOGW ("error saving lease to %s: %s", lease_file, error->message);
977 978
}

979 980 981
static void
bound4_handle (NMDhcpNettools *self, NDhcp4ClientLease *lease)
{
982
	NMDhcpNettoolsPrivate *priv = NM_DHCP_NETTOOLS_GET_PRIVATE (self);
983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004
	const char *iface = nm_dhcp_client_get_iface (NM_DHCP_CLIENT (self));
	gs_unref_object NMIP4Config *ip4_config = NULL;
	gs_unref_hashtable GHashTable *options = NULL;
	GError *error = NULL;

	_LOGT ("lease available");

	ip4_config = lease_to_ip4_config (nm_dhcp_client_get_multi_idx (NM_DHCP_CLIENT (self)),
	                                  iface,
	                                  nm_dhcp_client_get_ifindex (NM_DHCP_CLIENT (self)),
	                                  lease,
	                                  nm_dhcp_client_get_route_table (NM_DHCP_CLIENT (self)),
	                                  nm_dhcp_client_get_route_metric (NM_DHCP_CLIENT (self)),
	                                  &options,
	                                  &error);
	if (!ip4_config) {
		_LOGW ("%s", error->message);
		g_clear_error (&error);
		nm_dhcp_client_set_state (NM_DHCP_CLIENT (self), NM_DHCP_STATE_FAIL, NULL, NULL);
		return;
	}

1005
	nm_dhcp_option_add_requests_to_options (options, _nm_dhcp_option_dhcp4_options);
1006
	lease_save (self, lease, priv->lease_file);
1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076

	nm_dhcp_client_set_state (NM_DHCP_CLIENT (self),
	                          NM_DHCP_STATE_BOUND,
	                          NM_IP_CONFIG_CAST (ip4_config),
	                          options);
}

static gboolean
dhcp4_event_handle (NMDhcpNettools *self,
                    NDhcp4ClientEvent *event)
{
	NMDhcpNettoolsPrivate *priv = NM_DHCP_NETTOOLS_GET_PRIVATE (self);
	int r;

	_LOGT ("client event %d", event->event);

	switch (event->event) {
	case N_DHCP4_CLIENT_EVENT_OFFER:
		/* always accept the first lease */
		r = n_dhcp4_client_lease_select (event->offer.lease);
		if (r) {
			_LOGW ("selecting lease failed: %d", r);
		}
		break;
	case N_DHCP4_CLIENT_EVENT_EXPIRED:
		nm_dhcp_client_set_state (NM_DHCP_CLIENT (self), NM_DHCP_STATE_EXPIRE, NULL, NULL);
		break;
	case N_DHCP4_CLIENT_EVENT_RETRACTED:
	case N_DHCP4_CLIENT_EVENT_CANCELLED:
		nm_dhcp_client_set_state (NM_DHCP_CLIENT (self), NM_DHCP_STATE_FAIL, NULL, NULL);
		break;
	case N_DHCP4_CLIENT_EVENT_GRANTED:
		priv->lease = n_dhcp4_client_lease_ref (event->granted.lease);
		bound4_handle (self, event->granted.lease);
		break;
	case N_DHCP4_CLIENT_EVENT_EXTENDED:
		bound4_handle (self, event->extended.lease);
		break;
	case N_DHCP4_CLIENT_EVENT_DOWN:
		/* ignore down events, they are purely informational */
		break;
	default:
		_LOGW ("unhandled DHCP event %d", event->event);
		break;
	}

	return TRUE;
}

static gboolean
dhcp4_event_cb (GIOChannel *source,
                GIOCondition condition,
                gpointer data)
{
	NMDhcpNettools *self = data;
	NMDhcpNettoolsPrivate *priv = NM_DHCP_NETTOOLS_GET_PRIVATE (self);
	NDhcp4ClientEvent *event;
	int r;

	r = n_dhcp4_client_dispatch (priv->client);
	if (r < 0)
		return G_SOURCE_CONTINUE;

	while (!n_dhcp4_client_pop_event (priv->client, &event) && event) {
		dhcp4_event_handle (self, event);
	}

	return G_SOURCE_CONTINUE;
}

1077
G_GNUC_PRINTF (3, 4)
Beniamino Galvani's avatar
Beniamino Galvani committed
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097
static void
nettools_log (int level, void *data, const char *fmt, ...)
{
	NMDhcpNettools *self = data;
	NMLogLevel nm_level;
	gs_free char *msg = NULL;
	va_list ap;

	nm_level = nm_log_level_from_syslog (level);
	if (nm_logging_enabled (nm_level, LOGD_DHCP4)) {
		va_start (ap, fmt);
		msg = g_strdup_vprintf (fmt, ap);
		va_end (ap);
		nm_log (nm_level, LOGD_DHCP4, NULL , NULL,
		        "dhcp4 (%s): %s",
		        nm_dhcp_client_get_iface (NM_DHCP_CLIENT (self)),
		        msg);
	}
}

1098 1099 1100 1101 1102 1103 1104 1105 1106
static gboolean
nettools_create (NMDhcpNettools *self,
                 const char *dhcp_anycast_addr,
                 GError **error)
{
	NMDhcpNettoolsPrivate *priv = NM_DHCP_NETTOOLS_GET_PRIVATE (self);
	nm_auto (n_dhcp4_client_config_freep) NDhcp4ClientConfig *config = NULL;
	nm_auto (n_dhcp4_client_unrefp) NDhcp4Client *client = NULL;
	GBytes *hwaddr;
1107
	GBytes *bcast_hwaddr;
1108
	const uint8_t *hwaddr_arr;
1109
	const uint8_t *bcast_hwaddr_arr;
1110
	gsize hwaddr_len;
1111
	gsize bcast_hwaddr_len;
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127
	GBytes *client_id;
	gs_unref_bytes GBytes *client_id_new = NULL;
	const uint8_t *client_id_arr;
	size_t client_id_len;
	int r, fd, arp_type, transport;

	g_return_val_if_fail (!priv->client, FALSE);

	hwaddr = nm_dhcp_client_get_hw_addr (NM_DHCP_CLIENT (self));
	if (   !hwaddr
	    || !(hwaddr_arr = g_bytes_get_data (hwaddr, &hwaddr_len))
	    || (arp_type = nm_utils_arp_type_detect_from_hwaddrlen (hwaddr_len)) < 0) {
		nm_utils_error_set_literal (error, NM_UTILS_ERROR_UNKNOWN, "invalid MAC address");
		return FALSE;
	}

1128 1129 1130
	bcast_hwaddr = nm_dhcp_client_get_broadcast_hw_addr (NM_DHCP_CLIENT (self));
	bcast_hwaddr_arr = g_bytes_get_data (bcast_hwaddr, &bcast_hwaddr_len);

1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
	switch (arp_type) {
	case ARPHRD_ETHER:
		transport = N_DHCP4_TRANSPORT_ETHERNET;
		break;
	case ARPHRD_INFINIBAND:
		transport = N_DHCP4_TRANSPORT_INFINIBAND;
		break;
	default:
		nm_utils_error_set_literal (error, NM_UTILS_ERROR_UNKNOWN, "unsupported ARP type");
		return FALSE;
	}

	/* Note that we always set a client-id. In particular for infiniband that is necessary,
	 * see https://tools.ietf.org/html/rfc4390#section-2.1 . */
	client_id = nm_dhcp_client_get_client_id (NM_DHCP_CLIENT (self));
	if (!client_id) {
		client_id_new = nm_utils_dhcp_client_id_mac (arp_type, hwaddr_arr, hwaddr_len);
		client_id = client_id_new;
	}

	if (   !(client_id_arr = g_bytes_get_data (client_id, &client_id_len))
	    || client_id_len < 2) {

		/* invalid client-ids are not expected. */
		nm_assert_not_reached ();

		nm_utils_error_set_literal (error, NM_UTILS_ERROR_UNKNOWN, "no valid IPv4 client-id");
		return FALSE;
	}

	r = n_dhcp4_client_config_new (&config);
	if (r) {
1163
		nm_utils_error_set_errno (error, r, "failed to create client-config: %s");
1164 1165 1166
		return FALSE;
	}

Beniamino Galvani's avatar
Beniamino Galvani committed
1167 1168
	n_dhcp4_client_config_set_log_level (config, nm_log_level_to_syslog (nm_logging_get_level (LOGD_DHCP4)));
	n_dhcp4_client_config_set_log_func (config, nettools_log, self);
1169 1170 1171
	n_dhcp4_client_config_set_ifindex (config, nm_dhcp_client_get_ifindex (NM_DHCP_CLIENT (self)));
	n_dhcp4_client_config_set_transport (config, transport);
	n_dhcp4_client_config_set_mac (config, hwaddr_arr, hwaddr_len);
1172
	n_dhcp4_client_config_set_broadcast_mac (config, bcast_hwaddr_arr, bcast_hwaddr_len);
1173 1174 1175
	r = n_dhcp4_client_config_set_client_id (config,
	                                         client_id_arr,
	                                         NM_MIN (client_id_len, 1 + _NM_SD_MAX_CLIENT_ID_LEN));
1176
	if (r) {
1177
		nm_utils_error_set_errno (error, r, "failed to set client-id: %s");
1178 1179 1180 1181 1182
		return FALSE;
	}

	r = n_dhcp4_client_new (&client, config);
	if (r) {
1183
		nm_utils_error_set (error, NM_UTILS_ERROR_UNKNOWN, "failed to create client: error %d", r);
1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210
		return FALSE;
	}

	priv->client = client;
	client = NULL;

	n_dhcp4_client_get_fd (priv->client, &fd);
	priv->channel = g_io_channel_unix_new (fd);
	priv->event_id = g_io_add_watch (priv->channel, G_IO_IN, dhcp4_event_cb, self);

	return TRUE;
}

static gboolean
_accept (NMDhcpClient *client,
         GError **error)
{
	NMDhcpNettools *self = NM_DHCP_NETTOOLS (client);
	NMDhcpNettoolsPrivate *priv = NM_DHCP_NETTOOLS_GET_PRIVATE (self);
	int r;

	g_return_val_if_fail (priv->lease, FALSE);

	_LOGT ("accept");

	r = n_dhcp4_client_lease_accept (priv->lease);
	if (r) {
1211
		nm_utils_error_set_errno (error, r, "failed to accept lease: %s");
1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
		return FALSE;
	}

	priv->lease = n_dhcp4_client_lease_unref (priv->lease);

	return TRUE;
}

static gboolean
decline (NMDhcpClient *client,
         const char *error_message,
         GError **error)
{
	NMDhcpNettools *self = NM_DHCP_NETTOOLS (client);
	NMDhcpNettoolsPrivate *priv = NM_DHCP_NETTOOLS_GET_PRIVATE (self);
	int r;

	g_return_val_if_fail (priv->lease, FALSE);

	_LOGT ("dhcp4-client: decline");

	r = n_dhcp4_client_lease_decline (priv->lease, error_message);
	if (r) {
1235
		nm_utils_error_set_errno (error, r, "failed to decline lease: %s");
1236 1237 1238 1239 1240 1241 1242 1243
		return FALSE;
	}

	priv->lease = n_dhcp4_client_lease_unref (priv->lease);

	return TRUE;
}

1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259
static guint8
fqdn_flags_to_wire (NMDhcpHostnameFlags flags)
{
	guint r = 0;

	/* RFC 4702 section 2.1 */
	if (flags & NM_DHCP_HOSTNAME_FLAG_FQDN_SERV_UPDATE)
		r |= (1 << 0);
	if (flags & NM_DHCP_HOSTNAME_FLAG_FQDN_ENCODED)
		r |= (1 << 2);
	if (flags & NM_DHCP_HOSTNAME_FLAG_FQDN_NO_UPDATE)
		r |= (1 << 3);

	return r;
}

1260 1261 1262 1263 1264 1265 1266 1267 1268
static gboolean
ip4_start (NMDhcpClient *client,
           const char *dhcp_anycast_addr,
           const char *last_ip4_address,
           GError **error)
{
	nm_auto (n_dhcp4_client_probe_config_freep) NDhcp4ClientProbeConfig *config = NULL;
	NMDhcpNettools *self = NM_DHCP_NETTOOLS (client);
	NMDhcpNettoolsPrivate *priv = NM_DHCP_NETTOOLS_GET_PRIVATE (self);
1269
	gs_free char *lease_file = NULL;
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
	struct in_addr last_addr = { 0 };
	const char *hostname;
	int r, i;

	g_return_val_if_fail (!priv->probe, FALSE);

	if (!nettools_create (self, dhcp_anycast_addr, error))
		return FALSE;

	r = n_dhcp4_client_probe_config_new (&config);
	if (r) {
		nm_utils_error_set_errno (error, r, "failed to create dhcp-client-probe-config: %s");
		return FALSE;
	}

	/*
1286
	 * FIXME:
1287 1288
	 * Select, or configure, a reasonable start delay, to protect poor servers beeing flooded.
	 */
1289
	n_dhcp4_client_probe_config_set_start_delay (config, 1);
1290

1291 1292 1293 1294 1295 1296 1297
	nm_dhcp_utils_get_leasefile_path (AF_INET,
	                                  "internal",
	                                  nm_dhcp_client_get_iface (client),
	                                  nm_dhcp_client_get_uuid (client),
	                                  &lease_file);

	if (last_ip4_address)
1298
		inet_pton (AF_INET, last_ip4_address, &last_addr);
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311
	else {
		/*
		 * TODO: we stick to the systemd-networkd lease file format. Quite easy for now to
		 * just use the functions in systemd code. Anyway, as in the end we just use the
		 * ip address from all the options found in the lease, write a function that parses
		 * the lease file just for the assigned address and returns it in &last_address.
		 * Then drop reference to systemd-networkd structures and functions.
		 */
		nm_auto (sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL;

		dhcp_lease_load (&lease, lease_file);
		if (lease)
			sd_dhcp_lease_get_address (lease, &last_addr);
1312 1313
	}

1314 1315 1316
	if (last_addr.s_addr)
		n_dhcp4_client_probe_config_set_requested_ip (config, last_addr);

1317
	/* Add requested options */
1318 1319 1320 1321 1322
	for (i = 0; _nm_dhcp_option_dhcp4_options[i].name; i++) {
		if (_nm_dhcp_option_dhcp4_options[i].include) {
			nm_assert (_nm_dhcp_option_dhcp4_options[i].option_num <= 255);
			n_dhcp4_client_probe_config_request_option (config,
			                                            _nm_dhcp_option_dhcp4_options[i].option_num);
1323 1324 1325 1326 1327
		}
	}

	hostname = nm_dhcp_client_get_hostname (client);
	if (hostname) {
1328
		if (nm_dhcp_client_get_use_fqdn (client)) {
1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354
			uint8_t buffer[255];
			NMDhcpHostnameFlags flags;
			size_t fqdn_len;

			flags = nm_dhcp_client_get_hostname_flags (client);
			buffer[0] = fqdn_flags_to_wire (flags);
			buffer[1] = 0;   /* RCODE1 (deprecated) */
			buffer[2] = 0;   /* RCODE2 (deprecated) */

			if (flags & NM_DHCP_HOSTNAME_FLAG_FQDN_ENCODED) {
				r = nm_sd_dns_name_to_wire_format (hostname,
				                                   buffer + 3,
				                                   sizeof (buffer) - 3,
				                                   FALSE);
				if (r <= 0) {
					nm_utils_error_set_errno (error, r, "failed to convert DHCP FQDN: %s");
					return FALSE;
				}
				fqdn_len = r;
			} else {
				fqdn_len = strlen (hostname);
				if (fqdn_len > sizeof (buffer) - 3) {
					nm_utils_error_set (error, r, "failed to set DHCP FQDN: name too long");
					return FALSE;
				}
				memcpy (buffer + 3, hostname, fqdn_len);
1355 1356 1357
			}

			r = n_dhcp4_client_probe_config_append_option (config,
1358
			                                               NM_DHCP_OPTION_DHCP4_CLIENT_FQDN,
1359
			                                               buffer,
1360
			                                               3 + fqdn_len);
1361 1362 1363 1364 1365 1366
			if (r) {
				nm_utils_error_set_errno (error, r, "failed to set DHCP FQDN: %s");
				return FALSE;
			}
		} else {
			r = n_dhcp4_client_probe_config_append_option (config,
1367
			                                               NM_DHCP_OPTION_DHCP4_HOST_NAME,
1368 1369 1370 1371 1372 1373
			                                               hostname,
			                                               strlen (hostname));
			if (r) {
				nm_utils_error_set_errno (error, r, "failed to set DHCP hostname: %s");
				return FALSE;
			}
1374 1375 1376
		}
	}

1377 1378 1379
	g_free (priv->lease_file);
	priv->lease_file = g_steal_pointer (&lease_file);

1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418
	r = n_dhcp4_client_probe (priv->client, &priv->probe, config);
	if (r) {
		nm_utils_error_set_errno (error, r, "failed to start DHCP client: %s");
		return FALSE;
	}

	_LOGT ("dhcp-client4: start %p", (gpointer) priv->client);

	nm_dhcp_client_start_timeout (client);
	return TRUE;
}

static void
stop (NMDhcpClient *client,
      gboolean release)
{
	NMDhcpNettools *self = NM_DHCP_NETTOOLS (client);
	NMDhcpNettoolsPrivate *priv = NM_DHCP_NETTOOLS_GET_PRIVATE (self);

	NM_DHCP_CLIENT_CLASS (nm_dhcp_nettools_parent_class)->stop (client, release);

	_LOGT ("dhcp-client4: stop %p",
	       (gpointer) priv->client);

	priv->probe = n_dhcp4_client_probe_free (priv->probe);
}

/*****************************************************************************/

static void
nm_dhcp_nettools_init (NMDhcpNettools *self)
{
}

static void
dispose (GObject *object)
{
	NMDhcpNettoolsPrivate *priv = NM_DHCP_NETTOOLS_GET_PRIVATE ((NMDhcpNettools *) object);

1419
	nm_clear_pointer (&priv->lease_file, g_free);
1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443
	nm_clear_pointer (&priv->channel, g_io_channel_unref);
	nm_clear_g_source (&priv->event_id);
	nm_clear_pointer (&priv->lease, n_dhcp4_client_lease_unref);
	nm_clear_pointer (&priv->probe, n_dhcp4_client_probe_free);
	nm_clear_pointer (&priv->client, n_dhcp4_client_unref);

	G_OBJECT_CLASS (nm_dhcp_nettools_parent_class)->dispose (object);
}

static void
nm_dhcp_nettools_class_init (NMDhcpNettoolsClass *class)
{
	NMDhcpClientClass *client_class = NM_DHCP_CLIENT_CLASS (class);
	GObjectClass *object_class = G_OBJECT_CLASS (class);

	object_class->dispose = dispose;

	client_class->ip4_start = ip4_start;
	client_class->accept = _accept;
	client_class->decline = decline;
	client_class->stop = stop;
}

const NMDhcpClientFactory _nm_dhcp_client_factory_nettools = {
1444 1445 1446
	.name         = "nettools",
	.get_type     = nm_dhcp_nettools_get_type,
	.experimental = TRUE,
1447
};