varlink: add generic impl. of io.systemd.service.SetLogLevel()

diff --git a/src/shared/varlink-io.systemd.service.c b/src/shared/varlink-io.systemd.service.c
index 4b3240da7c7493a9b4b27ad7c790d5d7642ba721..675f949929ee435b541609aa5cd76eaa4c509599 100644 (file)
--- a/src/shared/varlink-io.systemd.service.c
+++ b/src/shared/varlink-io.systemd.service.c
@@ -1,5 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
+#include <unistd.h>
+
 #include "varlink-io.systemd.service.h"
 
 static VARLINK_DEFINE_METHOD(Ping);
@@ -27,3 +29,42 @@ int varlink_method_ping(Varlink *link, JsonVariant *parameters, VarlinkMethodFla
 
         return varlink_reply(link, NULL);
 }
+
+int varlink_method_set_log_level(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
+        static const JsonDispatch dispatch_table[] = {
+                {"level", JSON_VARIANT_INTEGER, json_dispatch_int64, 0, JSON_MANDATORY},
+                {}
+        };
+
+        int64_t level;
+        uid_t uid;
+        int r;
+
+        assert(link);
+        assert(parameters);
+
+        /* NOTE: The method does have 1 parameter, but we must compare to 2 here, because
+         * json_variant_elements() breaks abstraction and exposes internal structure of JsonObject. */
+        if (json_variant_elements(parameters) != 2)
+                return varlink_error_invalid_parameter(link, parameters);
+
+        r = json_dispatch(parameters, dispatch_table, NULL, 0, &level);
+        if (r < 0)
+                return r;
+
+        if (LOG_PRI(level) != level)
+                return varlink_error_invalid_parameter(link, parameters);
+
+        r = varlink_get_peer_uid(link, &uid);
+        if (r < 0)
+                return r;
+
+        if (uid != getuid() && uid != 0)
+                return varlink_error(link, VARLINK_ERROR_PERMISSION_DENIED, parameters);
+
+        log_debug("Received io.systemd.service.SetLogLevel(%" PRIi64 ")", level);
+
+        log_set_max_level(level);
+
+        return varlink_reply(link, NULL);
+}

diff --git a/src/shared/varlink-io.systemd.service.h b/src/shared/varlink-io.systemd.service.h
index 6433fd12fb5de41882edb9fc56928c012d292c79..bc90ff098661aeb4acbc52b62867f8c21c7272b3 100644 (file)
--- a/src/shared/varlink-io.systemd.service.h
+++ b/src/shared/varlink-io.systemd.service.h
@@ -7,3 +7,4 @@
 extern const VarlinkInterface vl_interface_io_systemd_service;
 
 int varlink_method_ping(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata);
+int varlink_method_set_log_level(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata);