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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "dns-domain.h"
#include "hostname-util.h"
#include "networkd-dns.h"
#include "networkd-manager.h"
#include "networkd-network.h"
#include "parse-util.h"
#include "string-table.h"
UseDomains link_get_use_domains(Link *link, NetworkConfigSource proto) {
UseDomains n, c, m;
assert(link);
assert(link->manager);
if (!link->network)
return USE_DOMAINS_NO;
switch (proto) {
case NETWORK_CONFIG_SOURCE_DHCP4:
n = link->network->dhcp_use_domains;
c = link->network->compat_dhcp_use_domains;
m = link->manager->dhcp_use_domains;
break;
case NETWORK_CONFIG_SOURCE_DHCP6:
n = link->network->dhcp6_use_domains;
c = link->network->compat_dhcp_use_domains;
m = link->manager->dhcp6_use_domains;
break;
case NETWORK_CONFIG_SOURCE_NDISC:
n = link->network->ndisc_use_domains;
c = _USE_DOMAINS_INVALID;
m = link->manager->ndisc_use_domains;
break;
default:
assert_not_reached();
}
/* If per-network and per-protocol setting is specified, use it. */
if (n >= 0)
return n;
/* If compat setting is specified, use it. */
if (c >= 0)
return c;
/* If per-network but protocol-independent setting is specified, use it. */
if (link->network->use_domains >= 0)
return link->network->use_domains;
/* If global per-protocol setting is specified, use it. */
if (m >= 0)
return m;
/* If none of them are specified, use the global protocol-independent value. */
return link->manager->use_domains;
}
bool link_get_use_dns(Link *link, NetworkConfigSource proto) {
int n, c;
assert(link);
if (!link->network)
return false;
switch (proto) {
case NETWORK_CONFIG_SOURCE_DHCP4:
n = link->network->dhcp_use_dns;
c = link->network->compat_dhcp_use_dns;
break;
case NETWORK_CONFIG_SOURCE_DHCP6:
n = link->network->dhcp6_use_dns;
c = link->network->compat_dhcp_use_dns;
break;
case NETWORK_CONFIG_SOURCE_NDISC:
n = link->network->ndisc_use_dns;
c = -1;
break;
default:
assert_not_reached();
}
/* If per-network and per-protocol setting is specified, use it. */
if (n >= 0)
return n;
/* If compat setting is specified, use it. */
if (c >= 0)
return c;
/* Otherwise, defaults to yes. */
return true;
}
bool link_get_use_dnr(Link *link, NetworkConfigSource proto) {
int n;
assert(link);
if (!link->network)
return false;
switch (proto) {
case NETWORK_CONFIG_SOURCE_DHCP4:
n = link->network->dhcp_use_dnr;
break;
case NETWORK_CONFIG_SOURCE_DHCP6:
n = link->network->dhcp6_use_dnr;
break;
case NETWORK_CONFIG_SOURCE_NDISC:
n = link->network->ndisc_use_dnr;
break;
default:
assert_not_reached();
}
/* If set explicitly, use that */
if (n >= 0)
return n;
/* Otherwise, default to the same as the UseDNS setting. After all,
* this is just another way for the server to tell us about DNS configuration. */
return link_get_use_dns(link, proto);
}
int config_parse_domains(
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) {
Network *n = ASSERT_PTR(userdata);
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
if (isempty(rvalue)) {
n->search_domains = ordered_set_free(n->search_domains);
n->route_domains = ordered_set_free(n->route_domains);
return 0;
}
for (const char *p = rvalue;;) {
_cleanup_free_ char *w = NULL, *normalized = NULL;
const char *domain;
bool is_route;
r = extract_first_word(&p, &w, NULL, 0);
if (r == -ENOMEM)
return log_oom();
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to extract search or route domain, ignoring: %s", rvalue);
return 0;
}
if (r == 0)
return 0;
is_route = w[0] == '~';
domain = is_route ? w + 1 : w;
if (dns_name_is_root(domain) || streq(domain, "*")) {
/* If the root domain appears as is, or the special token "*" is found, we'll
* consider this as routing domain, unconditionally. */
is_route = true;
domain = "."; /* make sure we don't allow empty strings, thus write the root
* domain as "." */
} else {
r = dns_name_normalize(domain, 0, &normalized);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"'%s' is not a valid domain name, ignoring.", domain);
continue;
}
domain = normalized;
if (is_localhost(domain)) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"'localhost' domain may not be configured as search or route domain, ignoring assignment: %s",
domain);
continue;
}
}
OrderedSet **set = is_route ? &n->route_domains : &n->search_domains;
r = ordered_set_put_strdup(set, domain);
if (r == -EEXIST)
continue;
if (r < 0)
return log_oom();
}
}
int config_parse_dns(
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) {
Network *n = ASSERT_PTR(userdata);
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
if (isempty(rvalue)) {
for (unsigned i = 0; i < n->n_dns; i++)
in_addr_full_free(n->dns[i]);
n->dns = mfree(n->dns);
n->n_dns = 0;
return 0;
}
for (const char *p = rvalue;;) {
_cleanup_(in_addr_full_freep) struct in_addr_full *dns = NULL;
_cleanup_free_ char *w = NULL;
r = extract_first_word(&p, &w, NULL, 0);
if (r == -ENOMEM)
return log_oom();
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Invalid syntax, ignoring: %s", rvalue);
return 0;
}
if (r == 0)
return 0;
r = in_addr_full_new_from_string(w, &dns);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse dns server address, ignoring: %s", w);
continue;
}
if (IN_SET(dns->port, 53, 853))
dns->port = 0;
if (!GREEDY_REALLOC(n->dns, n->n_dns + 1))
return log_oom();
n->dns[n->n_dns++] = TAKE_PTR(dns);
}
}
int config_parse_dnssec_negative_trust_anchors(
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) {
Set **nta = ASSERT_PTR(data);
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
if (isempty(rvalue)) {
*nta = set_free_free(*nta);
return 0;
}
for (const char *p = rvalue;;) {
_cleanup_free_ char *w = NULL;
r = extract_first_word(&p, &w, NULL, 0);
if (r == -ENOMEM)
return log_oom();
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to extract negative trust anchor domain, ignoring: %s", rvalue);
return 0;
}
if (r == 0)
return 0;
r = dns_name_is_valid(w);
if (r <= 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"%s is not a valid domain name, ignoring.", w);
continue;
}
r = set_ensure_consume(nta, &dns_name_hash_ops, TAKE_PTR(w));
if (r < 0)
return log_oom();
}
}
static const char* const use_domains_table[_USE_DOMAINS_MAX] = {
[USE_DOMAINS_NO] = "no",
[USE_DOMAINS_ROUTE] = "route",
[USE_DOMAINS_YES] = "yes",
};
DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(use_domains, UseDomains, USE_DOMAINS_YES);
DEFINE_CONFIG_PARSE_ENUM(config_parse_use_domains, use_domains, UseDomains);
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