Refactor: extract Linux/macOS client shared code into common

common/posix_net_helpers.h

@@ -0,0 +1,99 @@
+// posix_net_helpers.h
+// Linux/macOS 客户端共用的网络/Shell 工具：execCmd / httpGet / getPublicIP /
+// jsonExtract / getGeoLocation。Windows 端已有等价实现，不应包含此头。
+//
+// 全部 inline，header-only，避免新增 .cpp / 改 CMakeLists。
+//
+// 设计说明：
+//   - httpGet 优先 curl，备选 wget（Linux 默认自带；macOS 默认无 wget，缺失时
+//     wget 命令失败、execCmd 返空——无副作用，等价于"只用 curl"）
+//   - getPublicIP 轮询多个公网 IP 查询源，按顺序尝试直到成功
+//   - jsonExtract 仅做最简单的 "key":"value" 提取，不依赖 jsoncpp
+//   - getGeoLocation 通过 ipinfo.io 反查地理位置，与 Windows IPConverter 同源
+#pragma once
+
+#include <cstdio>
+#include <memory>
+#include <string>
+
+#include "common/logger.h"
+
+namespace PosixNet {
+
+// 执行 shell 命令，捕获其 stdout 输出（trim 末尾空白后返回）
+inline std::string execCmd(const std::string& cmd)
+{
+    std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd.c_str(), "r"), pclose);
+    if (!pipe) return "";
+    char buf[4096];
+    std::string result;
+    while (fgets(buf, sizeof(buf), pipe.get())) {
+        result += buf;
+    }
+    while (!result.empty() && (result.back() == '\n' || result.back() == '\r' || result.back() == ' '))
+        result.pop_back();
+    return result;
+}
+
+// HTTP GET 请求：优先 curl，备选 wget
+inline std::string httpGet(const std::string& url, int timeoutSec = 5)
+{
+    std::string t = std::to_string(timeoutSec);
+    std::string r = execCmd("curl -s --max-time " + t + " \"" + url + "\" 2>/dev/null");
+    if (!r.empty()) return r;
+    r = execCmd("wget -qO- --timeout=" + t + " \"" + url + "\" 2>/dev/null");
+    return r;
+}
+
+// 获取公网 IP（轮询多个查询源，与 Windows 端 IPConverter 一致）
+inline std::string getPublicIP()
+{
+    static const char* urls[] = {
+        "https://checkip.amazonaws.com",
+        "https://api.ipify.org",
+        "https://ipinfo.io/ip",
+        "https://icanhazip.com",
+        "https://ifconfig.me/ip",
+    };
+    for (auto& url : urls) {
+        std::string ip = httpGet(url, 3);
+        if (!ip.empty() && ip.find('.') != std::string::npos && ip.size() <= 45) {
+            Mprintf("getPublicIP: %s (from %s)\n", ip.c_str(), url);
+            return ip;
+        }
+    }
+    Mprintf("getPublicIP: all sources failed\n");
+    return "";
+}
+
+// 从 JSON 字符串中提取指定 key 的 string 值（简易解析，不依赖 jsoncpp）
+// 仅支持 "key": "value" 或 "key":"value" 格式
+inline std::string jsonExtract(const std::string& json, const std::string& key)
+{
+    std::string needle = "\"" + key + "\"";
+    size_t pos = json.find(needle);
+    if (pos == std::string::npos) return "";
+    pos = json.find(':', pos + needle.size());
+    if (pos == std::string::npos) return "";
+    pos = json.find('"', pos + 1);
+    if (pos == std::string::npos) return "";
+    size_t end = json.find('"', pos + 1);
+    if (end == std::string::npos) return "";
+    return json.substr(pos + 1, end - pos - 1);
+}
+
+// 获取 IP 地理位置（ipinfo.io，与 Windows IPConverter 同源）
+inline std::string getGeoLocation(const std::string& ip)
+{
+    if (ip.empty()) return "";
+    std::string json = httpGet("https://ipinfo.io/" + ip + "/json", 5);
+    if (json.empty()) return "";
+    std::string country = jsonExtract(json, "country");
+    std::string city    = jsonExtract(json, "city");
+    if (city.empty() && country.empty()) return "";
+    if (city.empty())    return country;
+    if (country.empty()) return city;
+    return city + ", " + country;
+}
+
+} // namespace PosixNet