[thirdparty/systemd.git] / src / network / networkd-dhcp-server.c

/* SPDX-License-Identifier: LGPL-2.1+ */

#include "sd-dhcp-server.h"

#include "fd-util.h"
#include "fileio.h"
#include "networkd-dhcp-server.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-network.h"
#include "parse-util.h"
#include "socket-netlink.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"

static Address* link_find_dhcp_server_address(Link *link) {
        Address *address;

        assert(link);
        assert(link->network);

        /* The first statically configured address if there is any */
        LIST_FOREACH(addresses, address, link->network->static_addresses)
                if (address->family == AF_INET &&
                    !in_addr_is_null(address->family, &address->in_addr))
                        return address;

        /* If that didn't work, find a suitable address we got from the pool */
        LIST_FOREACH(addresses, address, link->pool_addresses)
                if (address->family == AF_INET)
                        return address;

        return NULL;
}

static int link_push_uplink_to_dhcp_server(
                Link *link,
                sd_dhcp_lease_server_type what,
                sd_dhcp_server *s) {

        _cleanup_free_ struct in_addr *addresses = NULL;
        size_t n_addresses = 0, n_allocated = 0;
        bool use_dhcp_lease_data = true;

        assert(link);

        if (!link->network)
                return 0;
        assert(link->network);

        log_link_debug(link, "Copying %s from link", dhcp_lease_server_type_to_string(what));

        switch (what) {

        case SD_DHCP_LEASE_DNS:
                /* For DNS we have a special case. We the data configured explicitly locally along with the
                 * data from the DHCP lease. */

                for (unsigned i = 0; i < link->network->n_dns; i++) {
                        struct in_addr ia;

                        /* Only look for IPv4 addresses */
                        if (link->network->dns[i].family != AF_INET)
                                continue;

                        ia = link->network->dns[i].address.in;

                        /* Never propagate obviously borked data */
                        if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
                                continue;

                        if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
                                return log_oom();

                        addresses[n_addresses++] = ia;
                }

                use_dhcp_lease_data = link->network->dhcp_use_dns;
                break;

        case SD_DHCP_LEASE_NTP: {
                char **i;

                /* For NTP things are similar, but for NTP hostnames can be configured too, which we cannot
                 * propagate via DHCP. Hence let's only propagate those which are IP addresses. */

                STRV_FOREACH(i, link->network->ntp) {
                        union in_addr_union ia;

                        if (in_addr_from_string(AF_INET, *i, &ia) < 0)
                                continue;

                        /* Never propagate obviously borked data */
                        if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
                                continue;

                        if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
                                return log_oom();

                        addresses[n_addresses++] = ia.in;
                }

                use_dhcp_lease_data = link->network->dhcp_use_ntp;
                break;
        }

        case SD_DHCP_LEASE_SIP:

                /* For SIP we don't allow explicit, local configuration, but there's control whether to use the data */
                use_dhcp_lease_data = link->network->dhcp_use_sip;
                break;

        case SD_DHCP_LEASE_POP3:
        case SD_DHCP_LEASE_SMTP:
        case SD_DHCP_LEASE_LPR:
                /* For the other server types we currently do not allow local configuration of server data,
                 * since there are typically no local consumers of the data. */
                ;

        default:
                assert_not_reached("Unexpected server type");
        }

        if (use_dhcp_lease_data && link->dhcp_lease) {
                const struct in_addr *da;

                int n = sd_dhcp_lease_get_servers(link->dhcp_lease, what, &da);
                if (n > 0) {
                        if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
                                return log_oom();

                        for (int j = 0; j < n; j++)
                                if (in4_addr_is_non_local(&da[j]))
                                        addresses[n_addresses++] = da[j];
                }
        }

        if (n_addresses <= 0)
                return 0;

        return sd_dhcp_server_set_servers(s, what, addresses, n_addresses);
}

static int dhcp4_server_parse_dns_server_string_and_warn(Link *l, const char *string, struct in_addr **addresses, size_t *n_allocated, size_t *n_addresses) {
        for (;;) {
                _cleanup_free_ char *word = NULL, *server_name = NULL;
                union in_addr_union address;
                int family, r, ifindex = 0;

                r = extract_first_word(&string, &word, NULL, 0);
                if (r < 0)
                        return r;
                if (r == 0)
                        break;

                r = in_addr_ifindex_name_from_string_auto(word, &family, &address, &ifindex, &server_name);
                if (r < 0) {
                        log_warning_errno(r, "Failed to parse DNS server address '%s', ignoring: %m", word);
                        continue;
                }

                /* Only look for IPv4 addresses */
                if (family != AF_INET)
                        continue;

                /* Never propagate obviously borked data */
                if (in4_addr_is_null(&address.in) || in4_addr_is_localhost(&address.in))
                        continue;

                if (!GREEDY_REALLOC(*addresses, *n_allocated, *n_addresses + 1))
                        return log_oom();

                (*addresses)[(*n_addresses)++] = address.in;
        }

        return 0;
}

static int dhcp4_server_set_dns_from_resolve_conf(Link *link) {
        _cleanup_free_ struct in_addr *addresses = NULL;
        size_t n_addresses = 0, n_allocated = 0;
        _cleanup_fclose_ FILE *f = NULL;
        int n = 0, r;

        f = fopen(PRIVATE_UPLINK_RESOLV_CONF, "re");
        if (!f) {
                if (errno == ENOENT)
                        return 0;

                return log_warning_errno(errno, "Failed to open " PRIVATE_UPLINK_RESOLV_CONF ": %m");
        }

        for (;;) {
                _cleanup_free_ char *line = NULL;
                const char *a;
                char *l;

                r = read_line(f, LONG_LINE_MAX, &line);
                if (r < 0)
                        return log_error_errno(r, "Failed to read " PRIVATE_UPLINK_RESOLV_CONF ": %m");
                if (r == 0)
                        break;

                n++;

                l = strstrip(line);
                if (IN_SET(*l, '#', ';', 0))
                        continue;

                a = first_word(l, "nameserver");
                if (!a)
                        continue;

                r = dhcp4_server_parse_dns_server_string_and_warn(link, a, &addresses, &n_allocated, &n_addresses);
                if (r < 0)
                        log_warning_errno(r, "Failed to parse DNS server address '%s', ignoring.", a);
        }

        if (n_addresses <= 0)
                return 0;

        return sd_dhcp_server_set_dns(link->dhcp_server, addresses, n_addresses);
}

int dhcp4_server_configure(Link *link) {
        bool acquired_uplink = false;
        sd_dhcp_option *p;
        Link *uplink = NULL;
        Address *address;
        Iterator i;
        int r;

        address = link_find_dhcp_server_address(link);
        if (!address)
                return log_link_error_errno(link, SYNTHETIC_ERRNO(EBUSY),
                                            "Failed to find suitable address for DHCPv4 server instance.");

        /* use the server address' subnet as the pool */
        r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
                                          link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
        if (r < 0)
                return log_link_error_errno(link, r, "Failed to configure address pool for DHCPv4 server instance: %m");

        /* TODO:
        r = sd_dhcp_server_set_router(link->dhcp_server, &main_address->in_addr.in);
        if (r < 0)
                return r;
        */

        if (link->network->dhcp_server_max_lease_time_usec > 0) {
                r = sd_dhcp_server_set_max_lease_time(link->dhcp_server,
                                                      DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
                if (r < 0)
                        return log_link_error_errno(link, r, "Failed to set maximum lease time for DHCPv4 server instance: %m");
        }

        if (link->network->dhcp_server_default_lease_time_usec > 0) {
                r = sd_dhcp_server_set_default_lease_time(link->dhcp_server,
                                                          DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
                if (r < 0)
                        return log_link_error_errno(link, r, "Failed to set default lease time for DHCPv4 server instance: %m");
        }

        for (sd_dhcp_lease_server_type type = 0; type < _SD_DHCP_LEASE_SERVER_TYPE_MAX; type ++) {

                if (!link->network->dhcp_server_emit[type].emit)
                        continue;

                if (link->network->dhcp_server_emit[type].n_addresses > 0)
                        /* Explicitly specified servers to emit */
                        r = sd_dhcp_server_set_servers(
                                        link->dhcp_server,
                                        type,
                                        link->network->dhcp_server_emit[type].addresses,
                                        link->network->dhcp_server_emit[type].n_addresses);
                else {
                        /* Emission is requested, but nothing explicitly configured. Let's find a suitable upling */
                        if (!acquired_uplink) {
                                uplink = manager_find_uplink(link->manager, link);
                                acquired_uplink = true;
                        }

                        if (uplink && uplink->network)
                                r = link_push_uplink_to_dhcp_server(uplink, type, link->dhcp_server);
                        else if (type == SD_DHCP_LEASE_DNS)
                                r = dhcp4_server_set_dns_from_resolve_conf(link);
                        else {
                                log_link_debug(link,
                                               "Not emitting %s on link, couldn't find suitable uplink.",
                                               dhcp_lease_server_type_to_string(type));
                                continue;
                        }
                }

                if (r < 0)
                        log_link_warning_errno(link, r,
                                               "Failed to set %s for DHCP server, ignoring: %m",
                                               dhcp_lease_server_type_to_string(type));
        }

        r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
        if (r < 0)
                return log_link_error_errno(link, r, "Failed to set router emission for DHCP server: %m");

        if (link->network->dhcp_server_emit_timezone) {
                _cleanup_free_ char *buffer = NULL;
                const char *tz;

                if (link->network->dhcp_server_timezone)
                        tz = link->network->dhcp_server_timezone;
                else {
                        r = get_timezone(&buffer);
                        if (r < 0)
                                return log_link_error_errno(link, r, "Failed to determine timezone: %m");

                        tz = buffer;
                }

                r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
                if (r < 0)
                        return log_link_error_errno(link, r, "Failed to set timezone for DHCP server: %m");
        }

        ORDERED_HASHMAP_FOREACH(p, link->network->dhcp_server_send_options, i) {
                r = sd_dhcp_server_add_option(link->dhcp_server, p);
                if (r == -EEXIST)
                        continue;
                if (r < 0)
                        return log_link_error_errno(link, r, "Failed to set DHCPv4 option: %m");
        }

        ORDERED_HASHMAP_FOREACH(p, link->network->dhcp_server_send_vendor_options, i) {
                r = sd_dhcp_server_add_vendor_option(link->dhcp_server, p);
                if (r == -EEXIST)
                        continue;
                if (r < 0)
                        return log_link_error_errno(link, r, "Failed to set DHCPv4 option: %m");
        }

        if (!sd_dhcp_server_is_running(link->dhcp_server)) {
                r = sd_dhcp_server_start(link->dhcp_server);
                if (r < 0)
                        return log_link_error_errno(link, r, "Could not start DHCPv4 server instance: %m");
        }

        return 0;
}

int config_parse_dhcp_server_emit(
                const char *unit,
                const char *filename,
                unsigned line,
                const char *section,
                unsigned section_line,
                const char *lvalue,
                int ltype,
                const char *rvalue,
                void *data,
                void *userdata) {

        NetworkDHCPServerEmitAddress *emit = data;

        assert(emit);
        assert(rvalue);

        for (const char *p = rvalue;;) {
                _cleanup_free_ char *w = NULL;
                union in_addr_union a;
                int r;

                r = extract_first_word(&p, &w, NULL, 0);
                if (r == -ENOMEM)
                        return log_oom();
                if (r < 0) {
                        log_syntax(unit, LOG_ERR, filename, line, r,
                                   "Failed to extract word, ignoring: %s", rvalue);
                        return 0;
                }
                if (r == 0)
                        return 0;

                r = in_addr_from_string(AF_INET, w, &a);
                if (r < 0) {
                        log_syntax(unit, LOG_ERR, filename, line, r,
                                   "Failed to parse %s= address '%s', ignoring: %m", lvalue, w);
                        continue;
                }

                struct in_addr *m = reallocarray(emit->addresses, emit->n_addresses + 1, sizeof(struct in_addr));
                if (!m)
                        return log_oom();

                emit->addresses = m;
                emit->addresses[emit->n_addresses++] = a.in;
        }
}
Commit	Line	Data
8fcf1d61 YW	1	/* SPDX-License-Identifier: LGPL-2.1+ */
	2
	3	#include "sd-dhcp-server.h"
	4
dd1d3060 MAL	5	#include "fd-util.h"
dd1d3060 MAL	6	#include "fileio.h"
8fcf1d61 YW	7	#include "networkd-dhcp-server.h"
	8	#include "networkd-link.h"
	9	#include "networkd-manager.h"
	10	#include "networkd-network.h"
564ca984	11	#include "parse-util.h"
dd1d3060	12	#include "socket-netlink.h"
564ca984 SS	13	#include "string-table.h"
564ca984 SS	14	#include "string-util.h"
dd1d3060	15	#include "strv.h"
8fcf1d61 YW	16
	17	static Address* link_find_dhcp_server_address(Link *link) {
	18	Address *address;
	19
	20	assert(link);
	21	assert(link->network);
	22
	23	/* The first statically configured address if there is any */
5dc31db7 ZJS	24	LIST_FOREACH(addresses, address, link->network->static_addresses)
	25	if (address->family == AF_INET &&
	26	!in_addr_is_null(address->family, &address->in_addr))
	27	return address;
8fcf1d61 YW	28
8fcf1d61 YW	29	/* If that didn't work, find a suitable address we got from the pool */
5dc31db7 ZJS	30	LIST_FOREACH(addresses, address, link->pool_addresses)
	31	if (address->family == AF_INET)
	32	return address;
8fcf1d61 YW	33
	34	return NULL;
	35	}
	36
2a71d57f LP	37	static int link_push_uplink_to_dhcp_server(
	38	Link *link,
	39	sd_dhcp_lease_server_type what,
	40	sd_dhcp_server *s) {
	41
8fcf1d61 YW	42	_cleanup_free_ struct in_addr *addresses = NULL;
8fcf1d61 YW	43	size_t n_addresses = 0, n_allocated = 0;
2a71d57f	44	bool use_dhcp_lease_data = true;
8fcf1d61	45
2a71d57f	46	assert(link);
8fcf1d61	47
2a71d57f LP	48	if (!link->network)
	49	return 0;
	50	assert(link->network);
8fcf1d61	51
2a71d57f	52	log_link_debug(link, "Copying %s from link", dhcp_lease_server_type_to_string(what));
8fcf1d61	53
2a71d57f	54	switch (what) {
8fcf1d61	55
2a71d57f LP	56	case SD_DHCP_LEASE_DNS:
	57	/* For DNS we have a special case. We the data configured explicitly locally along with the
	58	* data from the DHCP lease. */
8fcf1d61	59
2a71d57f LP	60	for (unsigned i = 0; i < link->network->n_dns; i++) {
2a71d57f LP	61	struct in_addr ia;
8fcf1d61	62
2a71d57f LP	63	/* Only look for IPv4 addresses */
	64	if (link->network->dns[i].family != AF_INET)
	65	continue;
8fcf1d61	66
2a71d57f LP	67	ia = link->network->dns[i].address.in;
	68
	69	/* Never propagate obviously borked data */
	70	if (in4_addr_is_null(&ia) \|\| in4_addr_is_localhost(&ia))
	71	continue;
	72
	73	if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
8fcf1d61 YW	74	return log_oom();
8fcf1d61 YW	75
2a71d57f	76	addresses[n_addresses++] = ia;
8fcf1d61	77	}
8fcf1d61	78
2a71d57f LP	79	use_dhcp_lease_data = link->network->dhcp_use_dns;
2a71d57f LP	80	break;
8fcf1d61	81
2a71d57f LP	82	case SD_DHCP_LEASE_NTP: {
2a71d57f LP	83	char **i;
8fcf1d61	84
2a71d57f LP	85	/* For NTP things are similar, but for NTP hostnames can be configured too, which we cannot
2a71d57f LP	86	* propagate via DHCP. Hence let's only propagate those which are IP addresses. */
284e8fd0	87
2a71d57f LP	88	STRV_FOREACH(i, link->network->ntp) {
2a71d57f LP	89	union in_addr_union ia;
284e8fd0	90
2a71d57f LP	91	if (in_addr_from_string(AF_INET, *i, &ia) < 0)
2a71d57f LP	92	continue;
284e8fd0	93
2a71d57f LP	94	/* Never propagate obviously borked data */
	95	if (in4_addr_is_null(&ia.in) \|\| in4_addr_is_localhost(&ia.in))
	96	continue;
284e8fd0	97
2a71d57f LP	98	if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
2a71d57f LP	99	return log_oom();
284e8fd0	100
2a71d57f LP	101	addresses[n_addresses++] = ia.in;
2a71d57f LP	102	}
284e8fd0	103
2a71d57f	104	use_dhcp_lease_data = link->network->dhcp_use_ntp;
24e6f458	105	break;
2a71d57f	106	}
284e8fd0	107
ddb82ec2	108	case SD_DHCP_LEASE_SIP:
2a71d57f LP	109
	110	/* For SIP we don't allow explicit, local configuration, but there's control whether to use the data */
	111	use_dhcp_lease_data = link->network->dhcp_use_sip;
24e6f458	112	break;
284e8fd0	113
2a71d57f LP	114	case SD_DHCP_LEASE_POP3:
2a71d57f LP	115	case SD_DHCP_LEASE_SMTP:
ddb82ec2	116	case SD_DHCP_LEASE_LPR:
2a71d57f LP	117	/* For the other server types we currently do not allow local configuration of server data,
	118	* since there are typically no local consumers of the data. */
	119	;
d361b373	120
24e6f458	121	default:
2a71d57f	122	assert_not_reached("Unexpected server type");
f6269fe7 SS	123	}
f6269fe7 SS	124
2a71d57f	125	if (use_dhcp_lease_data && link->dhcp_lease) {
24e6f458	126	const struct in_addr *da;
f6269fe7	127
a2706075	128	int n = sd_dhcp_lease_get_servers(link->dhcp_lease, what, &da);
f6269fe7	129	if (n > 0) {
f6269fe7 SS	130	if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
	131	return log_oom();
	132
2a71d57f LP	133	for (int j = 0; j < n; j++)
	134	if (in4_addr_is_non_local(&da[j]))
	135	addresses[n_addresses++] = da[j];
f6269fe7 SS	136	}
	137	}
	138
	139	if (n_addresses <= 0)
	140	return 0;
	141
24e6f458	142	return sd_dhcp_server_set_servers(s, what, addresses, n_addresses);
299d578f SS	143	}
299d578f SS	144
dd1d3060 MAL	145	static int dhcp4_server_parse_dns_server_string_and_warn(Link l, const char string, struct in_addr *addresses, size_t n_allocated, size_t *n_addresses) {
	146	for (;;) {
	147	_cleanup_free_ char word = NULL, server_name = NULL;
	148	union in_addr_union address;
	149	int family, r, ifindex = 0;
	150
	151	r = extract_first_word(&string, &word, NULL, 0);
	152	if (r < 0)
	153	return r;
	154	if (r == 0)
	155	break;
	156
	157	r = in_addr_ifindex_name_from_string_auto(word, &family, &address, &ifindex, &server_name);
	158	if (r < 0) {
	159	log_warning_errno(r, "Failed to parse DNS server address '%s', ignoring: %m", word);
	160	continue;
	161	}
	162
	163	/* Only look for IPv4 addresses */
	164	if (family != AF_INET)
	165	continue;
	166
	167	/* Never propagate obviously borked data */
	168	if (in4_addr_is_null(&address.in) \|\| in4_addr_is_localhost(&address.in))
	169	continue;
	170
	171	if (!GREEDY_REALLOC(addresses, n_allocated, *n_addresses + 1))
	172	return log_oom();
	173
	174	(addresses)[(n_addresses)++] = address.in;
	175	}
	176
	177	return 0;
	178	}
	179
	180	static int dhcp4_server_set_dns_from_resolve_conf(Link *link) {
	181	_cleanup_free_ struct in_addr *addresses = NULL;
	182	size_t n_addresses = 0, n_allocated = 0;
	183	_cleanup_fclose_ FILE *f = NULL;
	184	int n = 0, r;
	185
	186	f = fopen(PRIVATE_UPLINK_RESOLV_CONF, "re");
	187	if (!f) {
	188	if (errno == ENOENT)
	189	return 0;
	190
	191	return log_warning_errno(errno, "Failed to open " PRIVATE_UPLINK_RESOLV_CONF ": %m");
	192	}
	193
	194	for (;;) {
	195	_cleanup_free_ char *line = NULL;
	196	const char *a;
	197	char *l;
	198
	199	r = read_line(f, LONG_LINE_MAX, &line);
	200	if (r < 0)
	201	return log_error_errno(r, "Failed to read " PRIVATE_UPLINK_RESOLV_CONF ": %m");
	202	if (r == 0)
	203	break;
	204
	205	n++;
	206
	207	l = strstrip(line);
	208	if (IN_SET(*l, '#', ';', 0))
209	continue;
210
211	a = first_word(l, "nameserver");
212	if (!a)
213	continue;
214
215	r = dhcp4_server_parse_dns_server_string_and_warn(link, a, &addresses, &n_allocated, &n_addresses);
216	if (r < 0)
217	log_warning_errno(r, "Failed to parse DNS server address '%s', ignoring.", a);
218	}
219
220	if (n_addresses <= 0)
221	return 0;
222
223	return sd_dhcp_server_set_dns(link->dhcp_server, addresses, n_addresses);
224	}
225
8fcf1d61	226	int dhcp4_server_configure(Link *link) {
8fcf1d61	227	bool acquired_uplink = false;
461dbb2f	228	sd_dhcp_option *p;
564ca984 SS	229	Link *uplink = NULL;
	230	Address *address;
	231	Iterator i;
8fcf1d61 YW	232	int r;
	233
	234	address = link_find_dhcp_server_address(link);
	235	if (!address)
c00c3b64 YW	236	return log_link_error_errno(link, SYNTHETIC_ERRNO(EBUSY),
c00c3b64 YW	237	"Failed to find suitable address for DHCPv4 server instance.");
8fcf1d61 YW	238
	239	/* use the server address' subnet as the pool */
	240	r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
	241	link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
	242	if (r < 0)
c00c3b64	243	return log_link_error_errno(link, r, "Failed to configure address pool for DHCPv4 server instance: %m");
8fcf1d61 YW	244
	245	/* TODO:
	246	r = sd_dhcp_server_set_router(link->dhcp_server, &main_address->in_addr.in);
	247	if (r < 0)
	248	return r;
	249	*/
	250
	251	if (link->network->dhcp_server_max_lease_time_usec > 0) {
	252	r = sd_dhcp_server_set_max_lease_time(link->dhcp_server,
	253	DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
	254	if (r < 0)
c00c3b64	255	return log_link_error_errno(link, r, "Failed to set maximum lease time for DHCPv4 server instance: %m");
8fcf1d61 YW	256	}
	257
	258	if (link->network->dhcp_server_default_lease_time_usec > 0) {
	259	r = sd_dhcp_server_set_default_lease_time(link->dhcp_server,
	260	DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
	261	if (r < 0)
c00c3b64	262	return log_link_error_errno(link, r, "Failed to set default lease time for DHCPv4 server instance: %m");
8fcf1d61 YW	263	}
8fcf1d61 YW	264
2a71d57f LP	265	for (sd_dhcp_lease_server_type type = 0; type < _SD_DHCP_LEASE_SERVER_TYPE_MAX; type ++) {
	266
	267	if (!link->network->dhcp_server_emit[type].emit)
	268	continue;
	269
	270	if (link->network->dhcp_server_emit[type].n_addresses > 0)
	271	/* Explicitly specified servers to emit */
	272	r = sd_dhcp_server_set_servers(
	273	link->dhcp_server,
	274	type,
	275	link->network->dhcp_server_emit[type].addresses,
	276	link->network->dhcp_server_emit[type].n_addresses);
	277	else {
	278	/* Emission is requested, but nothing explicitly configured. Let's find a suitable upling */
	279	if (!acquired_uplink) {
	280	uplink = manager_find_uplink(link->manager, link);
	281	acquired_uplink = true;
	282	}
	283
	284	if (uplink && uplink->network)
	285	r = link_push_uplink_to_dhcp_server(uplink, type, link->dhcp_server);
	286	else if (type == SD_DHCP_LEASE_DNS)
	287	r = dhcp4_server_set_dns_from_resolve_conf(link);
24e6f458	288	else {
2a71d57f LP	289	log_link_debug(link,
	290	"Not emitting %s on link, couldn't find suitable uplink.",
	291	dhcp_lease_server_type_to_string(type));
	292	continue;
24e6f458	293	}
299d578f	294	}
284e8fd0	295
2a71d57f LP	296	if (r < 0)
	297	log_link_warning_errno(link, r,
	298	"Failed to set %s for DHCP server, ignoring: %m",
	299	dhcp_lease_server_type_to_string(type));
	300	}
	301
8fcf1d61 YW	302	r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
8fcf1d61 YW	303	if (r < 0)
a0fa3ef7	304	return log_link_error_errno(link, r, "Failed to set router emission for DHCP server: %m");
8fcf1d61 YW	305
	306	if (link->network->dhcp_server_emit_timezone) {
	307	_cleanup_free_ char *buffer = NULL;
	308	const char *tz;
	309
	310	if (link->network->dhcp_server_timezone)
	311	tz = link->network->dhcp_server_timezone;
	312	else {
	313	r = get_timezone(&buffer);
	314	if (r < 0)
98b02994	315	return log_link_error_errno(link, r, "Failed to determine timezone: %m");
8fcf1d61 YW	316
	317	tz = buffer;
	318	}
	319
	320	r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
	321	if (r < 0)
c00c3b64	322	return log_link_error_errno(link, r, "Failed to set timezone for DHCP server: %m");
8fcf1d61	323	}
564ca984	324
0e96961d	325	ORDERED_HASHMAP_FOREACH(p, link->network->dhcp_server_send_options, i) {
461dbb2f	326	r = sd_dhcp_server_add_option(link->dhcp_server, p);
564ca984 SS	327	if (r == -EEXIST)
	328	continue;
	329	if (r < 0)
c00c3b64	330	return log_link_error_errno(link, r, "Failed to set DHCPv4 option: %m");
564ca984 SS	331	}
564ca984 SS	332
7354900d DW	333	ORDERED_HASHMAP_FOREACH(p, link->network->dhcp_server_send_vendor_options, i) {
	334	r = sd_dhcp_server_add_vendor_option(link->dhcp_server, p);
	335	if (r == -EEXIST)
	336	continue;
	337	if (r < 0)
	338	return log_link_error_errno(link, r, "Failed to set DHCPv4 option: %m");
	339	}
	340
8fcf1d61 YW	341	if (!sd_dhcp_server_is_running(link->dhcp_server)) {
	342	r = sd_dhcp_server_start(link->dhcp_server);
	343	if (r < 0)
a0fa3ef7	344	return log_link_error_errno(link, r, "Could not start DHCPv4 server instance: %m");
8fcf1d61 YW	345	}
	346
	347	return 0;
	348	}
	349
2a71d57f	350	int config_parse_dhcp_server_emit(
8fcf1d61 YW	351	const char *unit,
	352	const char *filename,
	353	unsigned line,
2a71d57f LP	354	const char *section,
2a71d57f LP	355	unsigned section_line,
8fcf1d61	356	const char *lvalue,
2a71d57f	357	int ltype,
8fcf1d61	358	const char *rvalue,
2a71d57f LP	359	void *data,
2a71d57f LP	360	void *userdata) {
8fcf1d61	361
2a71d57f LP	362	NetworkDHCPServerEmitAddress *emit = data;
	363
	364	assert(emit);
8fcf1d61 YW	365	assert(rvalue);
8fcf1d61 YW	366
c1997a5b	367	for (const char *p = rvalue;;) {
8fcf1d61 YW	368	_cleanup_free_ char *w = NULL;
8fcf1d61 YW	369	union in_addr_union a;
c1997a5b	370	int r;
8fcf1d61 YW	371
	372	r = extract_first_word(&p, &w, NULL, 0);
	373	if (r == -ENOMEM)
	374	return log_oom();
	375	if (r < 0) {
	376	log_syntax(unit, LOG_ERR, filename, line, r,
	377	"Failed to extract word, ignoring: %s", rvalue);
	378	return 0;
	379	}
	380	if (r == 0)
c1997a5b	381	return 0;
8fcf1d61 YW	382
	383	r = in_addr_from_string(AF_INET, w, &a);
	384	if (r < 0) {
	385	log_syntax(unit, LOG_ERR, filename, line, r,
c1997a5b	386	"Failed to parse %s= address '%s', ignoring: %m", lvalue, w);
8fcf1d61 YW	387	continue;
	388	}
	389
2a71d57f	390	struct in_addr *m = reallocarray(emit->addresses, emit->n_addresses + 1, sizeof(struct in_addr));
8fcf1d61 YW	391	if (!m)
	392	return log_oom();
	393
2a71d57f LP	394	emit->addresses = m;
2a71d57f LP	395	emit->addresses[emit->n_addresses++] = a.in;
8fcf1d61	396	}
8fcf1d61	397	}