1 files changed, 428 insertions, 0 deletions
diff --git a/indra/viewer_components/updater/llupdatedownloader.cpp b/indra/viewer_components/updater/llupdatedownloader.cpp
new file mode 100644
index 0000000000..c17a50e242
--- /dev/null
+++ b/indra/viewer_components/updater/llupdatedownloader.cpp
@@ -0,0 +1,428 @@
+/** 
+ * @file llupdatedownloader.cpp
+ *
+ * $LicenseInfo:firstyear=2010&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library 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
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "linden_common.h"
+#include <stdexcept>
+#include <boost/format.hpp>
+#include <boost/lexical_cast.hpp>
+#include <curl/curl.h>
+#include "lldir.h"
+#include "llfile.h"
+#include "llmd5.h"
+#include "llsd.h"
+#include "llsdserialize.h"
+#include "llthread.h"
+#include "llupdatedownloader.h"
+#include "llupdaterservice.h"
+
+
+class LLUpdateDownloader::Implementation:
+	public LLThread
+{
+public:
+	Implementation(LLUpdateDownloader::Client & client);
+	~Implementation();
+	void cancel(void);
+	void download(LLURI const & uri, std::string const & hash);
+	bool isDownloading(void);
+	size_t onHeader(void * header, size_t size);
+	size_t onBody(void * header, size_t size);
+	void resume(void);
+	
+private:
+	bool mCancelled;
+	LLUpdateDownloader::Client & mClient;
+	CURL * mCurl;
+	LLSD mDownloadData;
+	llofstream mDownloadStream;
+	std::string mDownloadRecordPath;
+	curl_slist * mHeaderList;
+	
+	void initializeCurlGet(std::string const & url, bool processHeader);
+	void resumeDownloading(size_t startByte);
+	void run(void);
+	void startDownloading(LLURI const & uri, std::string const & hash);
+	void throwOnCurlError(CURLcode code);
+	bool validateDownload(void);
+
+	LOG_CLASS(LLUpdateDownloader::Implementation);
+};
+
+
+namespace {
+	class DownloadError:
+		public std::runtime_error
+	{
+	public:
+		DownloadError(const char * message):
+			std::runtime_error(message)
+		{
+			; // No op.
+		}
+	};
+
+		
+	const char * gSecondLifeUpdateRecord = "SecondLifeUpdateDownload.xml";
+};
+
+
+
+// LLUpdateDownloader
+//-----------------------------------------------------------------------------
+
+
+
+std::string LLUpdateDownloader::downloadMarkerPath(void)
+{
+	return gDirUtilp->getExpandedFilename(LL_PATH_LOGS, gSecondLifeUpdateRecord);
+}
+
+
+LLUpdateDownloader::LLUpdateDownloader(Client & client):
+	mImplementation(new LLUpdateDownloader::Implementation(client))
+{
+	; // No op.
+}
+
+
+void LLUpdateDownloader::cancel(void)
+{
+	mImplementation->cancel();
+}
+
+
+void LLUpdateDownloader::download(LLURI const & uri, std::string const & hash)
+{
+	mImplementation->download(uri, hash);
+}
+
+
+bool LLUpdateDownloader::isDownloading(void)
+{
+	return mImplementation->isDownloading();
+}
+
+
+void LLUpdateDownloader::resume(void)
+{
+	mImplementation->resume();
+}
+
+
+
+// LLUpdateDownloader::Implementation
+//-----------------------------------------------------------------------------
+
+
+namespace {
+	size_t write_function(void * data, size_t blockSize, size_t blocks, void * downloader)
+	{
+		size_t bytes = blockSize * blocks;
+		return reinterpret_cast<LLUpdateDownloader::Implementation *>(downloader)->onBody(data, bytes);
+	}
+
+
+	size_t header_function(void * data, size_t blockSize, size_t blocks, void * downloader)
+	{
+		size_t bytes = blockSize * blocks;
+		return reinterpret_cast<LLUpdateDownloader::Implementation *>(downloader)->onHeader(data, bytes);
+	}
+}
+
+
+LLUpdateDownloader::Implementation::Implementation(LLUpdateDownloader::Client & client):
+	LLThread("LLUpdateDownloader"),
+	mCancelled(false),
+	mClient(client),
+	mCurl(0),
+	mHeaderList(0)
+{
+	CURLcode code = curl_global_init(CURL_GLOBAL_ALL); // Just in case.
+	llverify(code == CURLE_OK); // TODO: real error handling here. 
+}
+
+
+LLUpdateDownloader::Implementation::~Implementation()
+{
+	if(isDownloading()) {
+		cancel();
+		shutdown();
+	} else {
+		; // No op.
+	}
+	if(mCurl) curl_easy_cleanup(mCurl);
+}
+
+
+void LLUpdateDownloader::Implementation::cancel(void)
+{
+	mCancelled = true;
+}
+	
+
+void LLUpdateDownloader::Implementation::download(LLURI const & uri, std::string const & hash)
+{
+	if(isDownloading()) mClient.downloadError("download in progress");
+
+	mDownloadRecordPath = downloadMarkerPath();
+	mDownloadData = LLSD();
+	try {
+		startDownloading(uri, hash);
+	} catch(DownloadError const & e) {
+		mClient.downloadError(e.what());
+	}
+}
+
+
+bool LLUpdateDownloader::Implementation::isDownloading(void)
+{
+	return !isStopped();
+}
+
+
+void LLUpdateDownloader::Implementation::resume(void)
+{
+	mCancelled = false;
+
+	if(isDownloading()) {
+		mClient.downloadError("download in progress");
+	}
+
+	mDownloadRecordPath = downloadMarkerPath();
+	llifstream dataStream(mDownloadRecordPath);
+	if(!dataStream) {
+		mClient.downloadError("no download marker");
+		return;
+	}
+	
+	LLSDSerialize::fromXMLDocument(mDownloadData, dataStream);
+	
+	if(!mDownloadData.asBoolean()) {
+		mClient.downloadError("no download information in marker");
+		return;
+	}
+	
+	std::string filePath = mDownloadData["path"].asString();
+	try {
+		if(LLFile::isfile(filePath)) {		
+			llstat fileStatus;
+			LLFile::stat(filePath, &fileStatus);
+			if(fileStatus.st_size != mDownloadData["size"].asInteger()) {
+				resumeDownloading(fileStatus.st_size);
+			} else if(!validateDownload()) {
+				LLFile::remove(filePath);
+				download(LLURI(mDownloadData["url"].asString()), mDownloadData["hash"].asString());
+			} else {
+				mClient.downloadComplete(mDownloadData);
+			}
+		} else {
+			download(LLURI(mDownloadData["url"].asString()), mDownloadData["hash"].asString());
+		}
+	} catch(DownloadError & e) {
+		mClient.downloadError(e.what());
+	}
+}
+
+
+size_t LLUpdateDownloader::Implementation::onHeader(void * buffer, size_t size)
+{
+	char const * headerPtr = reinterpret_cast<const char *> (buffer);
+	std::string header(headerPtr, headerPtr + size);
+	size_t colonPosition = header.find(':');
+	if(colonPosition == std::string::npos) return size; // HTML response; ignore.
+	
+	if(header.substr(0, colonPosition) == "Content-Length") {
+		try {
+			size_t firstDigitPos = header.find_first_of("0123456789", colonPosition);
+			size_t lastDigitPos = header.find_last_of("0123456789");
+			std::string contentLength = header.substr(firstDigitPos, lastDigitPos - firstDigitPos + 1);
+			size_t size = boost::lexical_cast<size_t>(contentLength);
+			LL_INFOS("UpdateDownload") << "download size is " << size << LL_ENDL;
+			
+			mDownloadData["size"] = LLSD(LLSD::Integer(size));
+			llofstream odataStream(mDownloadRecordPath);
+			LLSDSerialize::toPrettyXML(mDownloadData, odataStream);
+		} catch (std::exception const & e) {
+			LL_WARNS("UpdateDownload") << "unable to read content length (" 
+				<< e.what() << ")" << LL_ENDL;
+		}
+	} else {
+		; // No op.
+	}
+	
+	return size;
+}
+
+
+size_t LLUpdateDownloader::Implementation::onBody(void * buffer, size_t size)
+{
+	if(mCancelled) return 0; // Forces a write error which will halt curl thread.
+	if((size == 0) || (buffer == 0)) return 0; 
+	
+	mDownloadStream.write(reinterpret_cast<const char *>(buffer), size);
+	if(mDownloadStream.bad()) {
+		return 0;
+	} else {
+		return size;
+	}
+}
+
+
+void LLUpdateDownloader::Implementation::run(void)
+{
+	CURLcode code = curl_easy_perform(mCurl);
+	mDownloadStream.close();
+	if(code == CURLE_OK) {
+		LLFile::remove(mDownloadRecordPath);
+		if(validateDownload()) {
+			LL_INFOS("UpdateDownload") << "download successful" << LL_ENDL;
+			mClient.downloadComplete(mDownloadData);
+		} else {
+			LL_INFOS("UpdateDownload") << "download failed hash check" << LL_ENDL;
+			std::string filePath = mDownloadData["path"].asString();
+			if(filePath.size() != 0) LLFile::remove(filePath);
+			mClient.downloadError("failed hash check");
+		}
+	} else if(mCancelled && (code == CURLE_WRITE_ERROR)) {
+		LL_INFOS("UpdateDownload") << "download canceled by user" << LL_ENDL;
+		// Do not call back client.
+	} else {
+		LL_WARNS("UpdateDownload") << "download failed with error '" << 
+			curl_easy_strerror(code) << "'" << LL_ENDL;
+		LLFile::remove(mDownloadRecordPath);
+		if(mDownloadData.has("path")) LLFile::remove(mDownloadData["path"].asString());
+		mClient.downloadError("curl error");
+	}
+	
+	if(mHeaderList) {
+		curl_slist_free_all(mHeaderList);
+		mHeaderList = 0;
+	}
+}
+
+
+void LLUpdateDownloader::Implementation::initializeCurlGet(std::string const & url, bool processHeader)
+{
+	if(mCurl == 0) {
+		mCurl = curl_easy_init();
+	} else {
+		curl_easy_reset(mCurl);
+	}
+	
+	if(mCurl == 0) throw DownloadError("failed to initialize curl");
+	
+	throwOnCurlError(curl_easy_setopt(mCurl, CURLOPT_NOSIGNAL, true));
+	throwOnCurlError(curl_easy_setopt(mCurl, CURLOPT_FOLLOWLOCATION, true));
+	throwOnCurlError(curl_easy_setopt(mCurl, CURLOPT_WRITEFUNCTION, &write_function));
+	throwOnCurlError(curl_easy_setopt(mCurl, CURLOPT_WRITEDATA, this));
+	if(processHeader) {
+	   throwOnCurlError(curl_easy_setopt(mCurl, CURLOPT_HEADERFUNCTION, &header_function));
+	   throwOnCurlError(curl_easy_setopt(mCurl, CURLOPT_HEADERDATA, this));
+	}
+	throwOnCurlError(curl_easy_setopt(mCurl, CURLOPT_HTTPGET, true));
+	throwOnCurlError(curl_easy_setopt(mCurl, CURLOPT_URL, url.c_str()));
+}
+
+
+void LLUpdateDownloader::Implementation::resumeDownloading(size_t startByte)
+{
+	LL_INFOS("UpdateDownload") << "resuming download from " << mDownloadData["url"].asString()
+		<< " at byte " << startByte << LL_ENDL;
+
+	initializeCurlGet(mDownloadData["url"].asString(), false);
+	
+	// The header 'Range: bytes n-' will request the bytes remaining in the
+	// source begining with byte n and ending with the last byte.
+	boost::format rangeHeaderFormat("Range: bytes=%u-");
+	rangeHeaderFormat % startByte;
+	mHeaderList = curl_slist_append(mHeaderList, rangeHeaderFormat.str().c_str());
+	if(mHeaderList == 0) throw DownloadError("cannot add Range header");
+	throwOnCurlError(curl_easy_setopt(mCurl, CURLOPT_HTTPHEADER, mHeaderList));
+	
+	mDownloadStream.open(mDownloadData["path"].asString(),
+						 std::ios_base::out | std::ios_base::binary | std::ios_base::app);
+	start();
+}
+
+
+void LLUpdateDownloader::Implementation::startDownloading(LLURI const & uri, std::string const & hash)
+{
+	mDownloadData["url"] = uri.asString();
+	mDownloadData["hash"] = hash;
+	mDownloadData["current_version"] = ll_get_version();
+	LLSD path = uri.pathArray();
+	if(path.size() == 0) throw DownloadError("no file path");
+	std::string fileName = path[path.size() - 1].asString();
+	std::string filePath = gDirUtilp->getExpandedFilename(LL_PATH_TEMP, fileName);
+	mDownloadData["path"] = filePath;
+
+	LL_INFOS("UpdateDownload") << "downloading " << filePath
+		<< " from " << uri.asString() << LL_ENDL;
+	LL_INFOS("UpdateDownload") << "hash of file is " << hash << LL_ENDL;
+		
+	llofstream dataStream(mDownloadRecordPath);
+	LLSDSerialize::toPrettyXML(mDownloadData, dataStream);
+	
+	mDownloadStream.open(filePath, std::ios_base::out | std::ios_base::binary);
+	initializeCurlGet(uri.asString(), true);
+	start();
+}
+
+
+void LLUpdateDownloader::Implementation::throwOnCurlError(CURLcode code)
+{
+	if(code != CURLE_OK) {
+		const char * errorString = curl_easy_strerror(code);
+		if(errorString != 0) {
+			throw DownloadError(curl_easy_strerror(code));
+		} else {
+			throw DownloadError("unknown curl error");
+		}
+	} else {
+		; // No op.
+	}
+}
+
+
+bool LLUpdateDownloader::Implementation::validateDownload(void)
+{
+	std::string filePath = mDownloadData["path"].asString();
+	llifstream fileStream(filePath, std::ios_base::in | std::ios_base::binary);
+	if(!fileStream) return false;
+
+	std::string hash = mDownloadData["hash"].asString();
+	if(hash.size() != 0) {
+		LL_INFOS("UpdateDownload") << "checking hash..." << LL_ENDL;
+		char digest[33];
+		LLMD5(fileStream).hex_digest(digest);
+		if(hash != digest) {
+			LL_WARNS("UpdateDownload") << "download hash mismatch; expeted " << hash <<
+				" but download is " << digest << LL_ENDL;
+		}
+		return hash == digest;
+	} else {
+		return true; // No hash check provided.
+	}
+}