MINOR: log/backend: prevent stick table and stick rules with LOG mode

Report a warning and prevent errors if user tries to declare a stick table
or use stick rules within a log backend.

include/haproxy/proxy.h

@@ -86,6 +86,7 @@ void proxy_adjust_all_maxconn(void);
 struct proxy *cli_find_frontend(struct appctx *appctx, const char *arg);
 struct proxy *cli_find_frontend(struct appctx *appctx, const char *arg);
 int resolve_stick_rule(struct proxy *curproxy, struct sticking_rule *mrule);
+void free_stick_rules(struct list *rules);
 
 /*
  * This function returns a string containing the type of the proxy in a format

src/log.c

@@ -898,6 +898,23 @@ static int _postcheck_log_backend_compat(struct proxy *be)
 		err_code |= ERR_WARN;
 		free_act_rules(&be->tcp_rep.inspect_rules);
 	}
+	if (be->table) {
+		ha_warning("Cannot use stick table with 'mode log' in %s '%s'. It will be ignored.\n",
+			   proxy_type_str(be), be->id);
+
+		err_code |= ERR_WARN;
+		stktable_deinit(be->table);
+		ha_free(&be->table);
+	}
+	if (!LIST_ISEMPTY(&be->storersp_rules) ||
+	    !LIST_ISEMPTY(&be->sticking_rules)) {
+		ha_warning("Cannot use sticking rules with 'mode log' in %s '%s'. They will be ignored.\n",
+			   proxy_type_str(be), be->id);
+
+		err_code |= ERR_WARN;
+		free_stick_rules(&be->storersp_rules);
+		free_stick_rules(&be->sticking_rules);
+	}
 	return err_code;
 }
 

src/proxy.c

@@ -165,7 +165,7 @@ int resolve_stick_rule(struct proxy *curproxy, struct sticking_rule *mrule)
 	return 1;
 }
 
-static void free_stick_rules(struct list *rules)
+void free_stick_rules(struct list *rules)
 {
 	struct sticking_rule *rule, *ruleb;