networkd: add support for Domains= to .network files

This allows the search/routing domanis to be specified per link/network and be passed
on to resolved.

4 files changed, 55 insertions, 3 deletions

diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 9eb2e89091..d25343ba2b 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -1722,6 +1722,7 @@ int link_save(Link *link) {
 
         if (link->network) {
                 char **address;
+                char **domain;
 
                 fputs("DNS=", f);
 
@@ -1763,15 +1764,26 @@ int link_save(Link *link) {
 
                 fputs("\n", f);
 
+                fprintf(f, "DOMAINS=");
+
                 if (link->network->dhcp_domains &&
                     link->dhcp_lease) {
                         const char *domainname;
 
                         r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
-                        if (r >= 0)
-                                fprintf(f, "DOMAINS=%s\n", domainname);
+                        if (r >= 0) {
+                                fputs(domainname, f);
+                                if (link->network->domains)
+                                        fputs(" ", f);
+                        }
                 }
 
+                STRV_FOREACH(domain, link->network->domains)
+                        fprintf(f, "%s%s", *domain,
+                                (domain + 1 ? " " : ""));
+
+                fputs("\n", f);
+
                 fprintf(f, "LLMNR=%s\n",
                         llmnr_support_to_string(link->network->llmnr));
         }
diff --git a/src/network/networkd-network-gperf.gperf b/src/network/networkd-network-gperf.gperf
index 9cd7a4aa61..c5b9614a2b 100644
--- a/src/network/networkd-network-gperf.gperf
+++ b/src/network/networkd-network-gperf.gperf
@@ -37,6 +37,7 @@ Network.IPv4LL,              config_parse_bool,                  0,
 Network.IPv4LLRoute,         config_parse_bool,                  0,                             offsetof(Network, ipv4ll_route)
 Network.Address,             config_parse_address,               0,                             0
 Network.Gateway,             config_parse_gateway,               0,                             0
+Network.Domains,             config_parse_domains,               0,                             offsetof(Network, domains)
 Network.DNS,                 config_parse_strv,                  0,                             offsetof(Network, dns)
 Network.LLMNR,               config_parse_llmnr,                 0,                             offsetof(Network, llmnr)
 Network.NTP,                 config_parse_strv,                  0,                             offsetof(Network, ntp)
diff --git a/src/network/networkd-network.c b/src/network/networkd-network.c
index e13e4a0f62..bbc5d279e9 100644
--- a/src/network/networkd-network.c
+++ b/src/network/networkd-network.c
@@ -341,6 +341,34 @@ int config_parse_netdev(const char *unit,
         return 0;
 }
 
+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) {
+        char ***domains = data;
+        char **domain;
+        int r;
+
+        r = config_parse_strv(unit, filename, line, section, section_line,
+                              lvalue, ltype, rvalue, domains, userdata);
+        if (r < 0)
+                return r;
+
+        strv_uniq(*domains);
+
+        STRV_FOREACH(domain, *domains)
+                if (is_localhost(*domain) || !hostname_is_valid(*domain))
+                        strv_remove(*domains, *domain);
+
+        return 0;
+}
+
 int config_parse_tunnel(const char *unit,
                         const char *filename,
                         unsigned line,
diff --git a/src/network/networkd.h b/src/network/networkd.h
index 90e798dbf5..a9867d9e7f 100644
--- a/src/network/networkd.h
+++ b/src/network/networkd.h
@@ -111,7 +111,7 @@ struct Network {
         Hashmap *addresses_by_section;
         Hashmap *routes_by_section;
 
-        char **dns, **ntp;
+        char **domains, **dns, **ntp;
 
         LLMNRSupport llmnr;
 
@@ -224,6 +224,17 @@ int config_parse_netdev(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);
 
+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);
+
 int config_parse_tunnel(const char *unit,
                         const char *filename,
                         unsigned line,