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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "alloc-util.h"
#include "ether-addr-util.h"
#include "hashmap.h"
#include "networkd-dhcp-server-static-lease.h"
#include "networkd-network.h"
#include "networkd-util.h"
DEFINE_SECTION_CLEANUP_FUNCTIONS(DHCPStaticLease, dhcp_static_lease_free);
DHCPStaticLease *dhcp_static_lease_free(DHCPStaticLease *static_lease) {
if (!static_lease)
return NULL;
if (static_lease->network && static_lease->section)
hashmap_remove(static_lease->network->dhcp_static_leases_by_section, static_lease->section);
config_section_free(static_lease->section);
free(static_lease->client_id);
return mfree(static_lease);
}
static int dhcp_static_lease_new(DHCPStaticLease **ret) {
DHCPStaticLease *p;
assert(ret);
p = new0(DHCPStaticLease, 1);
if (!p)
return -ENOMEM;
*ret = TAKE_PTR(p);
return 0;
}
static int lease_new_static(Network *network, const char *filename, unsigned section_line, DHCPStaticLease **ret) {
_cleanup_(config_section_freep) ConfigSection *n = NULL;
_cleanup_(dhcp_static_lease_freep) DHCPStaticLease *static_lease = NULL;
int r;
assert(network);
assert(filename);
assert(section_line > 0);
assert(ret);
r = config_section_new(filename, section_line, &n);
if (r < 0)
return r;
static_lease = hashmap_get(network->dhcp_static_leases_by_section, n);
if (static_lease) {
*ret = TAKE_PTR(static_lease);
return 0;
}
r = dhcp_static_lease_new(&static_lease);
if (r < 0)
return r;
static_lease->network = network;
static_lease->section = TAKE_PTR(n);
r = hashmap_ensure_put(&network->dhcp_static_leases_by_section, &config_section_hash_ops, static_lease->section, static_lease);
if (r < 0)
return r;
*ret = TAKE_PTR(static_lease);
return 0;
}
static int static_lease_verify(DHCPStaticLease *static_lease) {
if (section_is_invalid(static_lease->section))
return -EINVAL;
if (in4_addr_is_null(&static_lease->address))
return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
"%s: DHCP static lease without Address= field configured. "
"Ignoring [DHCPServerStaticLease] section from line %u.",
static_lease->section->filename, static_lease->section->line);
/* TODO: check that the address is in the pool. */
if (static_lease->client_id_size == 0 || !static_lease->client_id)
return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
"%s: DHCP static lease without MACAddress= field configured. "
"Ignoring [DHCPServerStaticLease] section from line %u.",
static_lease->section->filename, static_lease->section->line);
assert(static_lease->client_id_size == ETH_ALEN + 1);
return 0;
}
void network_drop_invalid_static_leases(Network *network) {
DHCPStaticLease *static_lease;
assert(network);
HASHMAP_FOREACH(static_lease, network->dhcp_static_leases_by_section)
if (static_lease_verify(static_lease) < 0)
dhcp_static_lease_free(static_lease);
}
int config_parse_dhcp_static_lease_address(
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) {
_cleanup_(dhcp_static_lease_free_or_set_invalidp) DHCPStaticLease *lease = NULL;
Network *network = ASSERT_PTR(userdata);
union in_addr_union addr;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
r = lease_new_static(network, filename, section_line, &lease);
if (r < 0)
return log_oom();
if (isempty(rvalue)) {
lease->address.s_addr = 0;
TAKE_PTR(lease);
return 0;
}
r = in_addr_from_string(AF_INET, rvalue, &addr);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse IPv4 address for DHCPv4 static lease, ignoring assignment: %s", rvalue);
return 0;
}
if (in4_addr_is_null(&addr.in)) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"IPv4 address for DHCPv4 static lease cannot be the ANY address, ignoring assignment: %s", rvalue);
return 0;
}
lease->address = addr.in;
TAKE_PTR(lease);
return 0;
}
int config_parse_dhcp_static_lease_hwaddr(
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) {
_cleanup_(dhcp_static_lease_free_or_set_invalidp) DHCPStaticLease *lease = NULL;
Network *network = ASSERT_PTR(userdata);
struct ether_addr hwaddr;
uint8_t *c;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
r = lease_new_static(network, filename, section_line, &lease);
if (r < 0)
return log_oom();
if (isempty(rvalue)) {
lease->client_id = mfree(lease->client_id);
lease->client_id_size = 0;
return 0;
}
r = parse_ether_addr(rvalue, &hwaddr);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse MAC address for DHCPv4 static lease, ignoring assignment: %s", rvalue);
return 0;
}
if (ether_addr_is_null(&hwaddr) || (hwaddr.ether_addr_octet[0] & 0x01)) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"MAC address for DHCPv4 static lease cannot be null or multicast, ignoring assignment: %s", rvalue);
return 0;
}
c = new(uint8_t, ETH_ALEN + 1);
if (!c)
return log_oom();
/* set client id type to 1: Ethernet Link-Layer (RFC 2132) */
c[0] = 0x01;
memcpy(c + 1, &hwaddr, ETH_ALEN);
free_and_replace(lease->client_id, c);
lease->client_id_size = ETH_ALEN + 1;
TAKE_PTR(lease);
return 0;
}
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