af-packet: clean up IPS config check

Don't emmit generic error statements on things that are not errors. Instead,
for cases where (part of) the config is missing, use the defaults and log
only a more detailed explanation at the 'config' level.

Minor code cleanups.

src/runmode-af-packet.c

@@ -66,36 +66,33 @@ const char *RunModeAFPGetDefaultMode(void)
     return "workers";
 }
 
-static int AFPRunModeIsIPS(void)
+static bool AFPRunModeIsIPS(void)
 {
     int nlive = LiveGetDeviceCount();
-    int ldev;
-    ConfNode *if_root;
-    ConfNode *if_default = NULL;
-    ConfNode *af_packet_node;
-    int has_ips = 0;
-    int has_ids = 0;
+    bool has_ips = false;
+    bool has_ids = false;
 
-    /* Find initial node */
-    af_packet_node = ConfGetNode("af-packet");
+    ConfNode *af_packet_node = ConfGetNode("af-packet");
     if (af_packet_node == NULL) {
-        return 0;
+        SCLogConfig("no 'af-packet' section in the yaml, default to IDS");
+        return false;
     }
 
-    if_default = ConfNodeLookupKeyValue(af_packet_node, "interface", "default");
+    ConfNode *if_default = ConfNodeLookupKeyValue(af_packet_node, "interface", "default");
 
-    for (ldev = 0; ldev < nlive; ldev++) {
+    for (int ldev = 0; ldev < nlive; ldev++) {
         const char *live_dev = LiveGetDeviceName(ldev);
         if (live_dev == NULL) {
-            SCLogError("Problem with config file");
-            return -1;
+            SCLogConfig("invalid livedev at index %d, default to IDS", ldev);
+            return false;
         }
-        if_root = ConfFindDeviceConfig(af_packet_node, live_dev);
-
+        ConfNode *if_root = ConfFindDeviceConfig(af_packet_node, live_dev);
         if (if_root == NULL) {
             if (if_default == NULL) {
-                SCLogError("Problem with config file");
-                return -1;
+                SCLogConfig(
+                        "no 'af-packet' section for '%s' or 'default' in the yaml, default to IDS",
+                        live_dev);
+                return false;
             }
             if_root = if_default;
         }
@@ -105,19 +102,19 @@ static int AFPRunModeIsIPS(void)
         if (ConfGetChildValueWithDefault(if_root, if_default, "copy-mode", &copymodestr) == 1 &&
                 ConfGetChildValue(if_root, "copy-iface", &copyifacestr) == 1) {
             if (strcmp(copymodestr, "ips") == 0) {
-                has_ips = 1;
+                has_ips = true;
             } else {
-                has_ids = 1;
+                has_ids = true;
             }
         } else {
-            has_ids = 1;
+            has_ids = true;
         }
     }
 
     if (has_ids && has_ips) {
         SCLogError("using both IPS and TAP/IDS mode is not allowed due to undefined behavior. See "
                    "ticket #5588.");
-        return -1;
+        return false;
     }
 
     return has_ips;
@@ -125,8 +122,8 @@ static int AFPRunModeIsIPS(void)
 
 static int AFPRunModeEnableIPS(void)
 {
-    int r = AFPRunModeIsIPS();
-    if (r == 1) {
+    bool r = AFPRunModeIsIPS();
+    if (r) {
         SCLogInfo("Setting IPS mode");
         EngineModeSetIPS();
     }