fix: wrong IP address with CDN

README.md

@@ -163,6 +163,39 @@ shell> vim ip.conf
 shell> nginx -s reload
 ```
 
+### 特殊情况
+
+在一些情况下，可能Nginx无法直接监听80与443端口，而是通过前置服务转发到指定端口，这种情况下配置文件需要稍加改动，同时前置服务器应开启 `Proxy Protocol` 支持。
+
+```
+# http流量转发到TCP/81端口
+server {
+    listen 81 proxy_protocol;
+    listen [::]:81 proxy_protocol;
+    server_name ip.343.re; # 改为自己的域名
+    location / {
+        if ($http_user_agent !~* (curl|wget)) {
+            return 301 https://$server_name$request_uri;
+        }
+        proxy_set_header X-Real-IP $proxy_protocol_addr;
+        proxy_pass http://127.0.0.1:1601;
+    }
+}
+
+# https流量转发到TCP/444端口
+server {
+    listen 444 ssl http2 proxy_protocol;
+    listen [::]:444 ssl http2 proxy_protocol;
+    server_name ip.343.re; # 改为自己的域名
+    ssl_certificate /etc/ssl/certs/343.re/fullchain.pem; # 改为自己的证书
+    ssl_certificate_key /etc/ssl/certs/343.re/privkey.pem;
+    location / {
+        proxy_set_header X-Real-IP $proxy_protocol_addr;
+        proxy_pass http://127.0.0.1:1601;
+    }
+}
+```
+
 ## 开发资料
 
 ### Docker容器
@@ -170,7 +203,7 @@ shell> nginx -s reload
 制作echoIP镜像
 
 ```
-shell> docker build -t echoip https://github.com/dnomd343/echoIP.git#main
+shell> docker build -t echoip https://github.com/dnomd343/echoIP.git#master
 ```
 
 启动容器

backend/queryInfo.php

@@ -126,9 +126,20 @@ function tryCIDR($beginIP, $endIP) { // 给定IP范围，尝试计算CIDR
 }
 
 function main() {
-    $ip = $_GET['ip'];
+    $ip = isset($_SERVER['HTTP_X_FORWARDED_FOR']) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $_SERVER['REMOTE_ADDR']; // 获取客户端IP
+    if ($_GET['justip'] == "true") { // 仅查询IP地址
+        if ($_GET['cli'] == "true") { // 命令行模式
+            echo $ip . PHP_EOL;
+        } else {
+            header('Content-Type: application/json; charset=utf-8');
+            echo '{"ip":"' . $ip . '"}'; // 返回JSON数据
+        }
+        exit;
+    }
+    $ip = isset($_GET['ip']) ? $_GET['ip'] : $ip; // 若存在请求信息则查询该IP
+
     if (!filter_var($ip, \FILTER_VALIDATE_IP)) { // 输入IP不合法
-        if ($_GET['cli'] == "true") {
+        if ($_GET['cli'] == "true") { // 命令行模式
             echo "Illegal IP format" . PHP_EOL;
         } else {
             $reply = array();

conf/nginx/docker.conf

@@ -6,8 +6,9 @@ server {
     real_ip_header X-Real-IP;
 
     location = / {
+        set $empty "";
         if ($http_user_agent ~* (curl|wget)) {
-            return 200 $remote_addr\n;
+            proxy_pass http://127.0.0.1:8080/ip$empty;
         }
         index index.html;
     }
@@ -21,10 +22,14 @@ server {
     }
 
     location = /ip {
+        set $query justip=true;
         if ($http_user_agent ~* (curl|wget)) {
-            return 200 $remote_addr\n;
+            set $query $query&cli=true;
         }
-        return 200 $remote_addr;
+        include fastcgi_params;
+        fastcgi_pass unix:/var/run/php/php7.3-fpm.sock;
+        fastcgi_param QUERY_STRING $query;
+        fastcgi_param SCRIPT_FILENAME /var/www/echoIP/backend/queryInfo.php;
     }
 
     location ~* ^/([^/]+?)$ {
@@ -36,11 +41,9 @@ server {
 
     location ^~ /info {
         set $is_cli 0;
-        set $is_https 0;
         set $is_legal 0;
         if ($uri ~* ^/info/?$) {
             set $is_legal 1;
-            set $query ip=$remote_addr;
         }
         if ($uri ~* ^/info/([^/]+?)$) {
             set $is_legal 1;

conf/nginx/ip.conf

@@ -31,8 +31,9 @@ server {
     real_ip_header X-Real-IP;
 
     location = / {
+        set $empty "";
         if ($http_user_agent ~* (curl|wget)) {
-            return 200 $remote_addr\n;
+            proxy_pass http://127.0.0.1:1601/ip$empty;
         }
         index index.html;
     }
@@ -46,10 +47,14 @@ server {
     }
 
     location = /ip {
+        set $query justip=true;
         if ($http_user_agent ~* (curl|wget)) {
-            return 200 $remote_addr\n;
+            set $query $query&cli=true;
         }
-        return 200 $remote_addr;
+        include fastcgi_params;
+        fastcgi_pass 127.0.0.1:9000; # php-fpm接口
+        fastcgi_param QUERY_STRING $query;
+        fastcgi_param SCRIPT_FILENAME /var/www/echoIP/backend/queryInfo.php;
     }
 
     location ~* ^/([^/]+?)$ {
@@ -61,11 +66,9 @@ server {
 
     location ^~ /info {
         set $is_cli 0;
-        set $is_https 0;
         set $is_legal 0;
         if ($uri ~* ^/info/?$) {
             set $is_legal 1;
-            set $query ip=$remote_addr;
         }
         if ($uri ~* ^/info/([^/]+?)$) {
             set $is_legal 1;