From e7c17a792fb23f564827e1612a8f289c0eb0f406 Mon Sep 17 00:00:00 2001
From: gaoyuheng <gaoyuheng@yuheng.hl.cn>
Date: Thu, 14 May 2026 16:03:13 +0800
Subject: [PATCH] fix

---
 install.sh |  2 ++
 trace      | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 trace

diff --git a/install.sh b/install.sh
index d4bb5c3..06c6c4f 100644
--- a/install.sh
+++ b/install.sh
@@ -25,6 +25,7 @@ mkdir -p /etc/bird-lg
 if [ -f "birdlgp/bird-lgproxy-go" ]; then
     mv birdlgp/bird-lgproxy-go /etc/bird-lg/bird-lgproxy-go
     mv birdlgp/nexttrace /etc/bird-lg/nexttrace
+    mv birdlgp/trace /etc/bird-lg/trace
     mv birdlgp/bird-lgproxy.yml /etc/bird-lg/bird-lgproxy.yml
 else
     echo "错误：仓库中未找到 bird-lgproxy-go，请检查仓库内容。"
@@ -34,6 +35,7 @@ fi
 # 赋予合理权限 (程序 755, 配置 644)
 chmod 755 /etc/bird-lg/bird-lgproxy-go
 chmod 755 /etc/bird-lg/nexttrace
+chmod 755 /etc/bird-lg/trace
 chmod 644 /etc/bird-lg/bird-lgproxy.yml
 
 # --- 3. 根据类型配置引导 ---
diff --git a/trace b/trace
new file mode 100644
index 0000000..341630f
--- /dev/null
+++ b/trace
@@ -0,0 +1,46 @@
+#!/bin/sh
+
+VARS_CONF="/etc/bird/vars.conf"
+NEXTTRACE="/etc/bird-lg/nexttrace"
+
+# 1. 提取目标 IP (URL 中的 q 参数传过来的最后一个参数)
+TARGET=$(echo "$@" | awk '{print $NF}')
+
+# 2. 预设必须要带的 nexttrace 参数
+# 这样即使 bird-lgproxy.yaml 里没写全，这里也会兜底
+FIXED_ARGS="-C -n -M -q 1"
+
+# --- 内部函数：从 vars.conf 提取定义的值 ---
+get_var() {
+    grep -E "define[[:space:]]+$1" "$VARS_CONF" | awk -F'=' '{print $2}' | tr -d ' ;"' | xargs
+}
+
+# --- 3. 根据目标 IP 段选择 Source IP ---
+SRC_IP=""
+
+if echo "$TARGET" | grep -q ':'; then
+    # IPv6 逻辑
+    if echo "$TARGET" | grep -qiE '^fd'; then
+        SRC_IP=$(get_var "DN42_V6_kernel")
+    else
+        SRC_IP=$(get_var "LOCAL_V6_kernel")
+    fi
+else
+    # IPv4 逻辑
+    if echo "$TARGET" | grep -qE '^(172\.(2[0-3]|1[6-9]))'; then
+        SRC_IP=$(get_var "DN42_V4_kernel")
+    elif echo "$TARGET" | grep -qE '^10\.'; then
+        SRC_IP=$(get_var "UNET_V4_kernel")
+    else
+        SRC_IP=$(get_var "LOCAL_V4_kernel")
+    fi
+fi
+
+# --- 4. 组合并执行 ---
+# 确保如果没读到变量，就不传 -s，避免 nexttrace 报错
+if [ -n "$SRC_IP" ]; then
+    # 使用 exec 替换当前进程，效率最高
+    exec "$NEXTTRACE" $FIXED_ARGS -s "$SRC_IP" "$TARGET"
+else
+    exec "$NEXTTRACE" $FIXED_ARGS "$TARGET"
+fi
\ No newline at end of file