Add configurable log level as optional CLI argument

All three programs now accept an optional second argument [log-level]
(trace, debug, info, warning, error, fatal) defaulting to info. The
level is applied by setting the logger context pointer directly,
avoiding a memory leak that would occur from overwriting the
heap-allocated logger struct. Also documents the ASan leak-check
workflow in CLAUDE.md.

1 files changed, 17 insertions, 2 deletions

diff --git a/src/server_register.c b/src/server_register.c
index ae8e959..5bdba8e 100644
--- a/src/server_register.c
+++ b/src/server_register.c
@@ -42,10 +42,21 @@ main (int argc, char **argv)
   signal (SIGINT, stopHandler);
   signal (SIGTERM, stopHandler);
 
-  if (argc != 2)
+  if (argc < 2 || argc > 3)
     {
       UA_LOG_FATAL (UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
-                    "Usage: %s <config-file>", argv[0]);
+                    "Usage: %s <config-file> [log-level]", argv[0]);
+      return EXIT_FAILURE;
+    }
+
+  const char *logLevelStr = (argc == 3) ? argv[2] : "info";
+  int logLevel = parseLogLevel (logLevelStr);
+  if (logLevel < 0)
+    {
+      UA_LOG_FATAL (UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
+                    "Unknown log level: %s "
+                    "(expected trace, debug, info, warning, error, fatal)",
+                    logLevelStr);
       return EXIT_FAILURE;
     }
 
@@ -182,6 +193,7 @@ main (int argc, char **argv)
     }
 
   UA_ServerConfig *serverConfig = UA_Server_getConfig (server);
+  serverConfig->logging->context = (void *)(uintptr_t)logLevel;
 
   /* Configure access control after server creation because
      UA_ServerConfig_setDefaultWithSecurityPolicies (called by
@@ -224,6 +236,7 @@ main (int argc, char **argv)
       configFree (&cfg);
       return EXIT_FAILURE;
     }
+  clientConfig.logging->context = (void *)(uintptr_t)logLevel;
   if (clientUsername)
     UA_ClientConfig_setAuthenticationUsername (&clientConfig, clientUsername,
                                                clientPassword);
@@ -254,6 +267,7 @@ main (int argc, char **argv)
               trustPaths, trustSize, securityMode, securityPolicyUri);
           if (retval == UA_STATUSCODE_GOOD)
             {
+              clientConfig.logging->context = (void *)(uintptr_t)logLevel;
               if (clientUsername)
                 UA_ClientConfig_setAuthenticationUsername (
                     &clientConfig, clientUsername, clientPassword);
@@ -278,6 +292,7 @@ main (int argc, char **argv)
       trustSize, securityMode, securityPolicyUri);
   if (retval == UA_STATUSCODE_GOOD)
     {
+      clientConfig.logging->context = (void *)(uintptr_t)logLevel;
       if (clientUsername)
         UA_ClientConfig_setAuthenticationUsername (
             &clientConfig, clientUsername, clientPassword);