f8862395e8
The Router DHCP option may contain a list of one or more routers ([1]). Extend the API of sd_dhcp_lease to return a list instead of only the first. Note that networkd still only uses the first router (if present). Aside from extending the internal API of the DHCP client, there is almost no change in behavior. The only visible difference in behavior is that the "ROUTER" variable in the lease file is now a list of addresses. Note how RFC 2132 does not define certain IP addresses as invalid for the router option. Still, previously sd_dhcp_lease_get_router() would never return a "0.0.0.0" address. In fact, the previous API could not differenciate whether no router option was present, whether it was invalid, or whether its first router was "0.0.0.0". No longer let the DHCP client library impose additional restrictions that are not part of RFC. Instead, the caller should handle this. The patch does that, and networkd only consideres the first router entry if it is not "0.0.0.0". [1] https://tools.ietf.org/html/rfc2132#section-3.5
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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/***
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Copyright © 2013 Intel Corporation. All rights reserved.
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***/
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#include <stdint.h>
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#include <linux/if_packet.h>
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#include "sd-dhcp-client.h"
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#include "dhcp-protocol.h"
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#include "list.h"
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#include "util.h"
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struct sd_dhcp_route {
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struct in_addr dst_addr;
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struct in_addr gw_addr;
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unsigned char dst_prefixlen;
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uint8_t option;
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};
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struct sd_dhcp_raw_option {
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LIST_FIELDS(struct sd_dhcp_raw_option, options);
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uint8_t tag;
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uint8_t length;
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void *data;
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};
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struct sd_dhcp_lease {
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unsigned n_ref;
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/* each 0 if unset */
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uint32_t t1;
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uint32_t t2;
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uint32_t lifetime;
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/* each 0 if unset */
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be32_t address;
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be32_t server_address;
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be32_t next_server;
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bool have_subnet_mask;
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be32_t subnet_mask;
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bool have_broadcast;
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be32_t broadcast;
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struct in_addr *router;
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size_t router_size;
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struct in_addr *dns;
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size_t dns_size;
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struct in_addr *ntp;
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size_t ntp_size;
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struct sd_dhcp_route *static_route;
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size_t static_route_size, static_route_allocated;
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uint16_t mtu; /* 0 if unset */
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char *domainname;
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char **search_domains;
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char *hostname;
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char *root_path;
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void *client_id;
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size_t client_id_len;
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void *vendor_specific;
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size_t vendor_specific_len;
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char *timezone;
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LIST_HEAD(struct sd_dhcp_raw_option, private_options);
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};
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int dhcp_lease_new(sd_dhcp_lease **ret);
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int dhcp_lease_parse_options(uint8_t code, uint8_t len, const void *option, void *userdata);
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int dhcp_lease_parse_search_domains(const uint8_t *option, size_t len, char ***domains);
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int dhcp_lease_insert_private_option(sd_dhcp_lease *lease, uint8_t tag, const void *data, uint8_t len);
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int dhcp_lease_set_default_subnet_mask(sd_dhcp_lease *lease);
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int dhcp_lease_set_client_id(sd_dhcp_lease *lease, const void *client_id, size_t client_id_len);
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int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file);
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int dhcp_lease_load(sd_dhcp_lease **ret, const char *lease_file);
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