Implement iptables forward manager core

lib/persist.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+if [[ -n ${IPF_PERSIST_SH_LOADED:-} ]]; then
+  return 0
+fi
+IPF_PERSIST_SH_LOADED=1
+
+: "${NETFILTER_PERSISTENT_BIN:=netfilter-persistent}"
+: "${IPF_SKIP_PERSIST:=0}"
+
+persist_available() {
+  [[ ${IPF_SKIP_PERSIST} == 1 ]] && return 0
+  command_is_available "${NETFILTER_PERSISTENT_BIN}"
+}
+
+persist_save() {
+  [[ ${IPF_SKIP_PERSIST} == 1 ]] && return 0
+  persist_available || {
+    log_err '未找到 netfilter-persistent，无法保存规则。'
+    return 1
+  }
+  "${NETFILTER_PERSISTENT_BIN}" save >/dev/null
+}
+
+persist_reload() {
+  [[ ${IPF_SKIP_PERSIST} == 1 ]] && return 0
+  persist_available || {
+    log_err '未找到 netfilter-persistent，无法重载规则。'
+    return 1
+  }
+  "${NETFILTER_PERSISTENT_BIN}" reload >/dev/null
+}