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authorTom Gundersen <teg@jklm.no>2014-01-05 23:01:10 +0100
committerTom Gundersen <teg@jklm.no>2014-01-12 15:37:21 +0100
commit3bef724f7e7f7eaca69881548b06e221b77d7031 (patch)
tree0b17e5a43d7e5c5d07dc696d23d4c829f9ab7200 /src/network/networkd-manager.c
parent924fe4304af981ffd849346b4a1d415f11e9dd79 (diff)
networkd: generate resolv.conf
This adds support to generate a basic resolv.conf in /run/systemd/network. This file will not take any effect unless a symlink is created from /etc/resolv.conf. Nameservers received over DHCP takes precedence over statically configured ones. Note: /etc/resolv.conf is severely limited, so in the future we will likely rather provide a much more powerfull nss plugin (or something to that effect), but this should allow current users to function without any loss of functionality.
Diffstat (limited to 'src/network/networkd-manager.c')
-rw-r--r--src/network/networkd-manager.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/src/network/networkd-manager.c b/src/network/networkd-manager.c
index c9ce1d6a13..f02eed1a59 100644
--- a/src/network/networkd-manager.c
+++ b/src/network/networkd-manager.c
@@ -19,10 +19,13 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <resolv.h>
+
#include "path-util.h"
#include "networkd.h"
#include "libudev-private.h"
#include "udev-util.h"
+#include "mkdir.h"
const char* const network_dirs[] = {
"/etc/systemd/network",
@@ -276,3 +279,75 @@ int manager_rtnl_listen(Manager *m) {
return 0;
}
+
+static void append_dns(FILE *f, struct in_addr *dns, unsigned char family, unsigned *count) {
+ char buf[INET6_ADDRSTRLEN];
+ const char *address;
+
+ address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN);
+ if (!address) {
+ log_warning("Invalid DNS address. Ignoring.");
+ return;
+ }
+
+ if (*count == MAXNS)
+ fputs("# Too many dynamic name servers configured, the "
+ "following entries will be ignored\n", f);
+
+ fprintf(f, "nameserver %s\n", address);
+
+ (*count) ++;
+}
+
+int manager_update_resolv_conf(Manager *m) {
+ _cleanup_free_ char *temp_path = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ Link *link;
+ Iterator i;
+ unsigned count = 0;
+ int r;
+
+ assert(m);
+
+ r = mkdir_safe_label("/run/systemd/network", 0755, 0, 0);
+ if (r < 0)
+ return r;
+
+ r = fopen_temporary("/run/systemd/network/resolv.conf", &f, &temp_path);
+ if (r < 0)
+ return r;
+
+ fchmod(fileno(f), 0644);
+
+ fputs("# This file is managed by systemd-networkd(8). Do not edit.\n", f);
+
+ HASHMAP_FOREACH(link, m->links, i) {
+ if (link->dhcp) {
+ struct in_addr **nameservers;
+
+ r = sd_dhcp_client_get_dns(link->dhcp, &nameservers);
+ if (r >= 0) {
+ unsigned j;
+
+ for (j = 0; nameservers[j]; j++)
+ append_dns(f, nameservers[j], AF_INET, &count);
+ }
+ }
+ }
+
+ HASHMAP_FOREACH(link, m->links, i)
+ if (link->network && link->network->dns)
+ append_dns(f, &link->network->dns->in_addr.in,
+ link->network->dns->family, &count);
+
+ fflush(f);
+
+ if (ferror(f) || rename(temp_path, "/run/systemd/network/resolv.conf") < 0) {
+ r = -errno;
+ unlink("/run/systemd/network/resolv.conf");
+ unlink(temp_path);
+ return r;
+ }
+
+ return 0;
+}