From e168b9d0614bb8cec5240a19d1605d3b61c9d495 Mon Sep 17 00:00:00 2001
From: Geoffrey Merck <F4FXL@users.noreply.github.com>
Date: Tue, 28 Dec 2021 16:40:34 +0100
Subject: [PATCH] Add XLX Downloader

---
 DStarGatewayApp.cpp        |  3 +-
 Makefile                   |  2 +-
 README.md                  |  2 +-
 XLXHostsFileDownloader.cpp | 66 ++++++++++++++++++++++++++++++++++++++
 XLXHostsFileDownloader.h   | 30 +++++++++++++++++
 5 files changed, 100 insertions(+), 3 deletions(-)
 create mode 100644 XLXHostsFileDownloader.cpp
 create mode 100644 XLXHostsFileDownloader.h

diff --git a/DStarGatewayApp.cpp b/DStarGatewayApp.cpp
index 3fc26aa..3e41146 100644
--- a/DStarGatewayApp.cpp
+++ b/DStarGatewayApp.cpp
@@ -34,6 +34,7 @@
 #include "Version.h"
 #include "GitVersion.h"
 #include "RepeaterProtocolHandlerFactory.h"
+#include "XLXHostsFileDownloader.h"
 #include "Log.h"
 
 int main(int argc, char *argv[])
@@ -201,7 +202,7 @@ bool CDStarGatewayApp::createThread()
 	TXLX xlxConfig;
 	config.getXLX(xlxConfig);
 	CLog::logInfo("XLX enabled: %d, Hosts file url: %s", int(xlxConfig.enabled), xlxConfig.url.c_str());
-	m_thread->setXLX(xlxConfig.enabled, xlxConfig.url);
+	m_thread->setXLX(xlxConfig.enabled, xlxConfig.enabled ? CXLXHostsFileDownloader::download(xlxConfig.url) : "");
 
 	// Setup Remote
 	TRemote remoteConfig;
diff --git a/Makefile b/Makefile
index 4567717..14752c7 100644
--- a/Makefile
+++ b/Makefile
@@ -34,7 +34,7 @@ DEPS = $(SRCS:.cpp=.d)
 all: dstargateway
 
 dstargateway : GitVersion.h $(OBJS) 
-	g++ $(CPPFLAGS) -o dstargateway $(OBJS) -lconfig++ -pthread
+	g++ $(CPPFLAGS) -o dstargateway $(OBJS) -lconfig++ -lcurl -pthread
 
 %.o : %.cpp
 	g++ $(CPPFLAGS) -MMD -MD -c $< -o $@
diff --git a/README.md b/README.md
index aca9639..2c1da9d 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 A wxWidgets free port of Jonathan Naylor's G4KLX ircDDBGatway.
 
-Only depenedencies are boost (headers only) and libconfig
+Only depenedencies are boost (headers only), libconfig and libcurl4-openssl-dev 
 
 # Not usable yet !
diff --git a/XLXHostsFileDownloader.cpp b/XLXHostsFileDownloader.cpp
new file mode 100644
index 0000000..0209378
--- /dev/null
+++ b/XLXHostsFileDownloader.cpp
@@ -0,0 +1,66 @@
+/*
+ *   Copyright (C) 2010-2013,2015,2018 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+ 
+#include <stdio.h>
+#include <cstdio>
+#include <curl/curl.h>
+
+#include "XLXHostsFileDownloader.h"
+#include "Log.h"
+ 
+size_t CXLXHostsFileDownloader::write_data(void *ptr, size_t size, size_t nmemb, FILE *stream)
+{
+    size_t written = fwrite(ptr, size, nmemb, stream);
+    return written;
+}
+
+/* wxHTTP randomly crashes when called on a worker thread, this must be called from main thread ! */
+std::string CXLXHostsFileDownloader::download(const std::string & xlxHostsFileURL)
+{
+    CURL *curl;
+    FILE *fp;
+    bool ok = false;
+	std::string outFileName;
+	char outFileNameBuf[] = "/tmp/XLXHostFile_XXXXXX";
+
+	CLog::logInfo("Downloading XLX host file from %s", xlxHostsFileURL.c_str());
+
+    curl = curl_easy_init();
+    if (curl) {
+        int filedes = mkstemp(outFileNameBuf);
+		if(filedes > 0 && (fp = fdopen(filedes,"wb")) != NULL) {
+			curl_easy_setopt(curl, CURLOPT_URL, xlxHostsFileURL.c_str());
+			curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+			curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
+			CURLcode res = curl_easy_perform(curl);
+			ok = res == 0;
+			/* always cleanup */
+			curl_easy_cleanup(curl);
+			fclose(fp);
+		}
+	}
+    
+
+	if(ok) {
+		outFileName = std::string(outFileNameBuf);
+	} else {
+		CLog::logError("Failed to download XLx Host file from %s", xlxHostsFileURL.c_str());
+	}
+
+	return outFileName;
+}
diff --git a/XLXHostsFileDownloader.h b/XLXHostsFileDownloader.h
new file mode 100644
index 0000000..5c43a05
--- /dev/null
+++ b/XLXHostsFileDownloader.h
@@ -0,0 +1,30 @@
+/*
+ *   Copyright (c) 2021 by Geoffrey Merck F4FXL / KC3FRA
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+
+#pragma once
+
+#include <string>
+
+class CXLXHostsFileDownloader {
+public:
+	static std::string download(const std::string & xlxHostsFileURL);
+private:
+	static size_t write_data(void *ptr, size_t size, size_t nmemb, FILE *stream);
+};
+