confd: extend syslogd support with hostname-based filtering

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

package/skeleton-init-finit/skeleton/etc/default/sysklogd

@@ -1,5 +1,7 @@
-# -l      :: Keep kernel looging to console
+# -H      :: Log remote messages using hostname from the message
+# -l      :: Keep kernel logging to console
 # -m0     :: Disable periodic syslog MARK entries
+# -n      :: Disable DNS query for every request, trust hostname in message
 # -s      :: Enable secure mode, don't listen to remote logs
 # -r 1M:5 :: Log rotation every 1 MiB and keep 5 rotated ones
-SYSLOGD_ARGS="-l -m0"
+SYSLOGD_ARGS="-H -l -m0"

src/confd/src/ietf-syslog.c

@@ -104,6 +104,20 @@ static size_t selector(sr_session_ctx_t *session, struct action *act)
 	char *pattern;
 	int rc;
 
+	/* Check for hostname-filter (infix-syslog augment) */
+	snprintf(xpath, sizeof(xpath), "%s/infix-syslog:hostname-filter", act->xpath);
+	rc = sr_get_items(session, xpath, 0, 0, &list, &count);
+	if (rc == SR_ERR_OK && count > 0) {
+		fprintf(act->fp, "+");
+		for (size_t i = 0; i < count; i++)
+			fprintf(act->fp, "%s%s", i ? "," : "", list[i].data.string_val);
+		fprintf(act->fp, "\n");
+
+		sr_free_values(list, count);
+		list = NULL;
+		count = 0;
+	}
+
 	/* Check for pattern-match (select-match feature) */
 	pattern = srx_get_str(session, "%s/pattern-match", act->xpath);
 	if (pattern) {

src/confd/yang/confd.inc

@@ -19,7 +19,7 @@ MODULES=(
         # NOTE: ietf-tls-client must be version matched with ietf-tls-server, used by netopeer2!
 	"ietf-tls-client@2023-12-28.yang"
 	"ietf-syslog@2024-03-21.yang -e file-action -e file-limit-size -e remote-action -e select-adv-compare -e select-match"
-	"infix-syslog@2024-07-19.yang"
+	"infix-syslog@2025-11-17.yang"
 	"iana-hardware@2018-03-13.yang"
 	"ietf-hardware@2018-03-13.yang -e hardware-state -e hardware-sensor"
 	"infix-hardware@2025-10-30.yang"

src/confd/yang/confd/infix-syslog.yang

@@ -16,6 +16,11 @@ module infix-syslog {
   contact      "kernelkit@googlegroups.com";
   description  "Infix augments and deviations to ietf-syslog, draft 32.";
 
+  revision 2025-11-17 {
+    description "Add hostname-filter support.";
+    reference "internal";
+  }
+
   revision 2024-07-19 {
     description "Initial revision, based on IETF syslog YANG draft 32.
                  The following changes have been made in this model:
@@ -164,6 +169,12 @@ module infix-syslog {
         }
       }
     }
+
+    leaf-list hostname-filter {
+      type inet:domain-name;
+      description "Filter messages by hostname. Messages from the listed
+                   hostnames will be logged to this file.";
+    }
   }
 
   augment "/syslog:syslog/syslog:actions/syslog:remote/syslog:destination" {