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resolved: allow configuration of routing domains in Domains=

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This commit is contained in:
Lennart Poettering 2016-01-25 23:40:02 +01:00
parent ad44b56b0f
commit adc800a6e0
2 changed files with 46 additions and 32 deletions
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58
man/resolved.conf.xml
View File

@ -72,40 +72,40 @@
<varlistentry>
<term><varname>DNS=</varname></term>
<listitem><para>A space-separated list of IPv4 and IPv6
addresses to be used as system DNS servers. DNS requests are
sent to one of the listed DNS servers in parallel to any
per-interface DNS servers acquired from
<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
For compatibility reasons, if this setting is not specified,
the DNS servers listed in
<filename>/etc/resolv.conf</filename> are used instead, if
that file exists and any servers are configured in it. This
setting defaults to the empty list.</para></listitem>
<listitem><para>A space-separated list of IPv4 and IPv6 addresses to use as system DNS servers. DNS requests
are sent to one of the listed DNS servers in parallel to suitable per-link DNS servers acquired from
<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> or
set at runtime by external applications. For compatibility reasons, if this setting is not specified, the DNS
servers listed in <filename>/etc/resolv.conf</filename> are used instead, if that file exists and any servers
are configured in it. This setting defaults to the empty list.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>FallbackDNS=</varname></term>
<listitem><para>A space-separated list of IPv4 and IPv6
addresses to be used as the fallback DNS servers. Any
per-interface DNS servers obtained from
<listitem><para>A space-separated list of IPv4 and IPv6 addresses to use as the fallback DNS servers. Any
per-link DNS servers obtained from
<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
take precedence over this setting, as do any servers set via
<varname>DNS=</varname> above or
<filename>/etc/resolv.conf</filename>. This setting is hence
only used if no other DNS server information is known. If this
option is not given, a compiled-in list of DNS servers is used
instead.</para></listitem>
take precedence over this setting, as do any servers set via <varname>DNS=</varname> above or
<filename>/etc/resolv.conf</filename>. This setting is hence only used if no other DNS server information is
known. If this option is not given, a compiled-in list of DNS servers is used instead.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>Domains=</varname></term>
<listitem><para>A space-separated list of search domains. For
compatibility reasons, if this setting is not specified, the
search domains listed in <filename>/etc/resolv.conf</filename>
are used instead, if that file exists and any domains are
configured in it. This setting defaults to the empty
list.</para></listitem>
<listitem><para>A space-separated list of domains. These domains are used as search suffixes when resolving
single-label host names (domain names which contain no dot), in order to qualify them into fully-qualified
domain names (FQDNs). Search domains are strictly processed in the order they are specified, until the name
with the suffix appended is found. For compatibility reasons, if this setting is not specified, the search
domains listed in <filename>/etc/resolv.conf</filename> are used instead, if that file exists and any domains
are configured in it. This setting defaults to the empty list.</para>
<para>Specified domain names may optionally be prefixed with <literal>~</literal>. In this case they do not
define a search path, but preferably direct DNS queries for the indicated domains to the DNS servers configured
with the system <varname>DNS=</varname> setting (see above), in case additional, suitable per-link DNS servers
are known. If no per-link DNS servers are known using the <literal>~</literal> syntax has no effect. Use the
construct <literal>~.</literal> (which is composed of <literal>~</literal> to indicate a routing domain and
<literal>.</literal> to indicate the DNS root domain that is the implied suffix of all DNS domains) to use the
system DNS server defined with <varname>DNS=</varname> preferably for all domains.</para></listitem>
</varlistentry>
<varlistentry>
@ -119,8 +119,8 @@
<literal>resolve</literal>, only resolution support is enabled,
but responding is disabled. Note that
<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
also maintains per-interface LLMNR settings. LLMNR will be
enabled on an interface only if the per-interface and the
also maintains per-link LLMNR settings. LLMNR will be
enabled on a link only if the per-link and the
global setting is on.</para></listitem>
</varlistentry>
@ -181,9 +181,9 @@
<para>In addition to this global DNSSEC setting
<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
also maintains per-interface DNSSEC settings. For system DNS
also maintains per-link DNSSEC settings. For system DNS
servers (see above), only the global DNSSEC setting is in
effect. For per-interface DNS servers the per-interface
effect. For per-link DNS servers the per-link
setting is in effect, unless it is unset in which case the
global setting is used instead.</para>

20
src/resolve/resolved-conf.c
View File

@ -80,20 +80,34 @@ int manager_parse_dns_server_string_and_warn(Manager *m, DnsServerType type, con
int manager_add_search_domain_by_string(Manager *m, const char *domain) {
DnsSearchDomain *d;
bool route_only;
int r;
assert(m);
assert(domain);
route_only = *domain == '~';
if (route_only)
domain++;
if (dns_name_is_root(domain) || streq(domain, "*")) {
route_only = true;
domain = ".";
}
r = dns_search_domain_find(m->search_domains, domain, &d);
if (r < 0)
return r;
if (r > 0) {
if (r > 0)
dns_search_domain_move_back_and_unmark(d);
return 0;
else {
r = dns_search_domain_new(m, &d, DNS_SEARCH_DOMAIN_SYSTEM, NULL, domain);
if (r < 0)
return r;
}
return dns_search_domain_new(m, NULL, DNS_SEARCH_DOMAIN_SYSTEM, NULL, domain);
d->route_only = route_only;
return 0;
}
int manager_parse_search_domains_and_warn(Manager *m, const char *string) {