560 lines
13 KiB
C
560 lines
13 KiB
C
// SoftEther VPN Source Code - Stable Edition Repository
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// Cedar Communication Module
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//
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// SoftEther VPN Server, Client and Bridge are free software under the Apache License, Version 2.0.
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//
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// Copyright (c) Daiyuu Nobori.
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// Copyright (c) SoftEther VPN Project, University of Tsukuba, Japan.
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// Copyright (c) SoftEther Corporation.
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// Copyright (c) all contributors on SoftEther VPN project in GitHub.
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//
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// All Rights Reserved.
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//
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// http://www.softether.org/
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//
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// This stable branch is officially managed by Daiyuu Nobori, the owner of SoftEther VPN Project.
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// Pull requests should be sent to the Developer Edition Master Repository on https://github.com/SoftEtherVPN/SoftEtherVPN
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//
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// License: The Apache License, Version 2.0
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// DISCLAIMER
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// ==========
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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// THIS SOFTWARE IS DEVELOPED IN JAPAN, AND DISTRIBUTED FROM JAPAN, UNDER
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// JAPANESE LAWS. YOU MUST AGREE IN ADVANCE TO USE, COPY, MODIFY, MERGE, PUBLISH,
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// DISTRIBUTE, SUBLICENSE, AND/OR SELL COPIES OF THIS SOFTWARE, THAT ANY
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// JURIDICAL DISPUTES WHICH ARE CONCERNED TO THIS SOFTWARE OR ITS CONTENTS,
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// AGAINST US (SOFTETHER PROJECT, SOFTETHER CORPORATION, DAIYUU NOBORI OR OTHER
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// SUPPLIERS), OR ANY JURIDICAL DISPUTES AGAINST US WHICH ARE CAUSED BY ANY KIND
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// OF USING, COPYING, MODIFYING, MERGING, PUBLISHING, DISTRIBUTING, SUBLICENSING,
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// AND/OR SELLING COPIES OF THIS SOFTWARE SHALL BE REGARDED AS BE CONSTRUED AND
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// CONTROLLED BY JAPANESE LAWS, AND YOU MUST FURTHER CONSENT TO EXCLUSIVE
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// JURISDICTION AND VENUE IN THE COURTS SITTING IN TOKYO, JAPAN. YOU MUST WAIVE
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// ALL DEFENSES OF LACK OF PERSONAL JURISDICTION AND FORUM NON CONVENIENS.
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// PROCESS MAY BE SERVED ON EITHER PARTY IN THE MANNER AUTHORIZED BY APPLICABLE
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// LAW OR COURT RULE.
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//
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// USE ONLY IN JAPAN. DO NOT USE THIS SOFTWARE IN ANOTHER COUNTRY UNLESS YOU HAVE
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// A CONFIRMATION THAT THIS SOFTWARE DOES NOT VIOLATE ANY CRIMINAL LAWS OR CIVIL
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// RIGHTS IN THAT PARTICULAR COUNTRY. USING THIS SOFTWARE IN OTHER COUNTRIES IS
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// COMPLETELY AT YOUR OWN RISK. THE SOFTETHER VPN PROJECT HAS DEVELOPED AND
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// DISTRIBUTED THIS SOFTWARE TO COMPLY ONLY WITH THE JAPANESE LAWS AND EXISTING
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// CIVIL RIGHTS INCLUDING PATENTS WHICH ARE SUBJECTS APPLY IN JAPAN. OTHER
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// COUNTRIES' LAWS OR CIVIL RIGHTS ARE NONE OF OUR CONCERNS NOR RESPONSIBILITIES.
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// WE HAVE NEVER INVESTIGATED ANY CRIMINAL REGULATIONS, CIVIL LAWS OR
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// INTELLECTUAL PROPERTY RIGHTS INCLUDING PATENTS IN ANY OF OTHER 200+ COUNTRIES
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// AND TERRITORIES. BY NATURE, THERE ARE 200+ REGIONS IN THE WORLD, WITH
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// DIFFERENT LAWS. IT IS IMPOSSIBLE TO VERIFY EVERY COUNTRIES' LAWS, REGULATIONS
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// AND CIVIL RIGHTS TO MAKE THE SOFTWARE COMPLY WITH ALL COUNTRIES' LAWS BY THE
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// PROJECT. EVEN IF YOU WILL BE SUED BY A PRIVATE ENTITY OR BE DAMAGED BY A
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// PUBLIC SERVANT IN YOUR COUNTRY, THE DEVELOPERS OF THIS SOFTWARE WILL NEVER BE
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// LIABLE TO RECOVER OR COMPENSATE SUCH DAMAGES, CRIMINAL OR CIVIL
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// RESPONSIBILITIES. NOTE THAT THIS LINE IS NOT LICENSE RESTRICTION BUT JUST A
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// STATEMENT FOR WARNING AND DISCLAIMER.
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//
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// READ AND UNDERSTAND THE 'WARNING.TXT' FILE BEFORE USING THIS SOFTWARE.
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// SOME SOFTWARE PROGRAMS FROM THIRD PARTIES ARE INCLUDED ON THIS SOFTWARE WITH
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// LICENSE CONDITIONS WHICH ARE DESCRIBED ON THE 'THIRD_PARTY.TXT' FILE.
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//
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//
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// SOURCE CODE CONTRIBUTION
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// ------------------------
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//
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// Your contribution to SoftEther VPN Project is much appreciated.
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// Please send patches to us through GitHub.
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// Read the SoftEther VPN Patch Acceptance Policy in advance:
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// http://www.softether.org/5-download/src/9.patch
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//
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//
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// DEAR SECURITY EXPERTS
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// ---------------------
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//
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// If you find a bug or a security vulnerability please kindly inform us
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// about the problem immediately so that we can fix the security problem
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// to protect a lot of users around the world as soon as possible.
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//
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// Our e-mail address for security reports is:
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// softether-vpn-security [at] softether.org
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//
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// Please note that the above e-mail address is not a technical support
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// inquiry address. If you need technical assistance, please visit
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// http://www.softether.org/ and ask your question on the users forum.
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//
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// Thank you for your cooperation.
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//
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//
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// NO MEMORY OR RESOURCE LEAKS
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// ---------------------------
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//
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// The memory-leaks and resource-leaks verification under the stress
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// test has been passed before release this source code.
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// Bridge.c
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// Ethernet Bridge Program (Local Bridge)
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#include <GlobalConst.h>
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#define BRIDGE_C
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#ifdef WIN32
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#define OS_WIN32
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#endif
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#ifdef OS_WIN32
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// Win32
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#include "BridgeWin32.c"
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#else
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// Unix
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#include "BridgeUnix.c"
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#endif // OS_WIN32
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// Hash the list of current Ethernet devices
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UINT GetEthDeviceHash()
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{
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#ifdef OS_UNIX
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// UNIX
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UINT num;
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UINT i;
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char tmp[4096];
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UCHAR hash[SHA1_SIZE];
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TOKEN_LIST *t = GetEthList();
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num = t->NumTokens;
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tmp[0] = 0;
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for (i = 0;i < t->NumTokens;i++)
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{
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StrCat(tmp, sizeof(tmp), t->Token[i]);
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}
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FreeToken(t);
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Hash(hash, tmp, StrLen(tmp), true);
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Copy(&num, hash, sizeof(UINT));
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return num;
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#else // OS_UNIX
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// Win32
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UINT ret = 0;
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MS_ADAPTER_LIST *a = MsCreateAdapterListEx(true);
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UINT num;
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UINT i;
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char tmp[4096];
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UCHAR hash[SHA1_SIZE];
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tmp[0] = 0;
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if (a != NULL)
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{
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for (i = 0;i < a->Num;i++)
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{
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StrCat(tmp, sizeof(tmp), a->Adapters[i]->Title);
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}
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}
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MsFreeAdapterList(a);
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Hash(hash, tmp, StrLen(tmp), true);
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Copy(&num, hash, sizeof(UINT));
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return num;
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#endif // OS_UNIX
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}
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// Get whether WinPcap is needed
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bool IsNeedWinPcap()
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{
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if (IsBridgeSupported() == false)
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{
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// Not in Windows
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return false;
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}
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else
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{
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// Windows
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if (IsEthSupported())
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{
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// Already success to access the Ethernet device
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return false;
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}
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else
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{
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// Failed to access the Ethernet device
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return true;
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}
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}
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}
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// Get whether the local-bridging is supported by current OS
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bool IsBridgeSupported()
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{
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UINT type = GetOsInfo()->OsType;
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if (OS_IS_WINDOWS(type))
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{
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if (IsEthSupported())
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{
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return true;
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}
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else
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{
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bool ret = false;
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#ifdef OS_WIN32
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ret = MsIsAdmin();
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#endif // OS_WIN32
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return ret;
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}
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}
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else
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{
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return IsEthSupported();
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}
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}
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// Delete a local-bridge
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bool DeleteLocalBridge(CEDAR *c, char *hubname, char *devicename)
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{
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bool ret = false;
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// Validate arguments
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if (c == NULL || hubname == NULL || devicename == NULL)
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{
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return false;
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}
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LockList(c->HubList);
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{
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LockList(c->LocalBridgeList);
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{
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UINT i;
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for (i = 0;i < LIST_NUM(c->LocalBridgeList);i++)
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{
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LOCALBRIDGE *br = LIST_DATA(c->LocalBridgeList, i);
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if (StrCmpi(br->HubName, hubname) == 0)
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{
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if (StrCmpi(br->DeviceName, devicename) == 0)
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{
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if (br->Bridge != NULL)
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{
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BrFreeBridge(br->Bridge);
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br->Bridge = NULL;
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}
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Delete(c->LocalBridgeList, br);
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Free(br);
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ret = true;
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break;
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}
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}
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}
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}
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UnlockList(c->LocalBridgeList);
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}
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UnlockList(c->HubList);
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return ret;
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}
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// Add a local-bridge
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void AddLocalBridge(CEDAR *c, char *hubname, char *devicename, bool local, bool monitor, bool tapmode, char *tapaddr, bool limit_broadcast)
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{
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UINT i;
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HUB *h = NULL;
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LOCALBRIDGE *br = NULL;
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// Validate arguments
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if (c == NULL || hubname == NULL || devicename == NULL)
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{
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return;
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}
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if (OS_IS_UNIX(GetOsInfo()->OsType) == false)
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{
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tapmode = false;
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}
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LockList(c->HubList);
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{
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LockList(c->LocalBridgeList);
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{
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bool exists = false;
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// Ensure that the same configuration local-bridge doesn't exist already
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for (i = 0;i < LIST_NUM(c->LocalBridgeList);i++)
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{
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LOCALBRIDGE *br = LIST_DATA(c->LocalBridgeList, i);
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if (StrCmpi(br->DeviceName, devicename) == 0)
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{
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if (StrCmpi(br->HubName, hubname) == 0)
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{
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if (br->TapMode == tapmode)
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{
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exists = true;
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}
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}
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}
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}
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if (exists == false)
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{
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// Add configuration
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br = ZeroMalloc(sizeof(LOCALBRIDGE));
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StrCpy(br->HubName, sizeof(br->HubName), hubname);
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StrCpy(br->DeviceName, sizeof(br->DeviceName), devicename);
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br->Bridge = NULL;
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br->Local = local;
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br->TapMode = tapmode;
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br->LimitBroadcast = limit_broadcast;
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br->Monitor = monitor;
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if (br->TapMode)
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{
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if (tapaddr != NULL && IsZero(tapaddr, 6) == false)
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{
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Copy(br->TapMacAddress, tapaddr, 6);
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}
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else
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{
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GenMacAddress(br->TapMacAddress);
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}
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}
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Add(c->LocalBridgeList, br);
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// Find the hub
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for (i = 0;i < LIST_NUM(c->HubList);i++)
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{
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HUB *hub = LIST_DATA(c->HubList, i);
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if (StrCmpi(hub->Name, br->HubName) == 0)
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{
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h = hub;
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AddRef(h->ref);
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break;
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}
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}
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}
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}
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UnlockList(c->LocalBridgeList);
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}
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UnlockList(c->HubList);
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// Start the local-bridge immediately
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if (h != NULL && br != NULL && h->Type != HUB_TYPE_FARM_DYNAMIC)
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{
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Lock(h->lock_online);
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{
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if (h->Offline == false)
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{
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LockList(c->LocalBridgeList);
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{
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if (IsInList(c->LocalBridgeList, br))
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{
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if (br->Bridge == NULL)
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{
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br->Bridge = BrNewBridge(h, br->DeviceName, NULL, br->Local, br->Monitor, br->TapMode, br->TapMacAddress, br->LimitBroadcast, br);
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}
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}
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}
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UnlockList(c->LocalBridgeList);
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}
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}
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Unlock(h->lock_online);
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}
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ReleaseHub(h);
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}
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// Initialize the local-bridge list
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void InitLocalBridgeList(CEDAR *c)
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{
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// Validate arguments
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if (c == NULL)
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{
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return;
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}
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c->LocalBridgeList = NewList(NULL);
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}
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// Free the local-bridge list
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void FreeLocalBridgeList(CEDAR *c)
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{
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UINT i;
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// Validate arguments
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if (c == NULL)
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{
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return;
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}
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for (i = 0;i < LIST_NUM(c->LocalBridgeList);i++)
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{
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LOCALBRIDGE *br = LIST_DATA(c->LocalBridgeList, i);
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Free(br);
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}
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ReleaseList(c->LocalBridgeList);
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c->LocalBridgeList = NULL;
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}
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// Bridging thread
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void BrBridgeThread(THREAD *thread, void *param)
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{
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BRIDGE *b;
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CONNECTION *c;
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SESSION *s;
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HUB *h;
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char name[MAX_SIZE];
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// Validate arguments
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if (thread == NULL || param == NULL)
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{
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return;
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}
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b = (BRIDGE *)param;
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// Create a connection object
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c = NewServerConnection(b->Cedar, NULL, thread);
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c->Protocol = CONNECTION_HUB_BRIDGE;
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// Create a session object
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s = NewServerSession(b->Cedar, c, b->Hub, BRIDGE_USER_NAME, b->Policy);
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HLog(b->Hub, "LH_START_BRIDGE", b->Name, s->Name);
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StrCpy(name, sizeof(name), b->Name);
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h = b->Hub;
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AddRef(h->ref);
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s->BridgeMode = true;
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s->Bridge = b;
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c->Session = s;
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ReleaseConnection(c);
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// Dummy user name for local-bridge
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s->Username = CopyStr(BRIDGE_USER_NAME_PRINT);
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b->Session = s;
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AddRef(s->ref);
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// Notify completion
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NoticeThreadInit(thread);
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// Main procedure of the session
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Debug("Bridge %s Start.\n", b->Name);
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SessionMain(s);
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Debug("Bridge %s Stop.\n", b->Name);
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HLog(h, "LH_STOP_BRIDGE", name);
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ReleaseHub(h);
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ReleaseSession(s);
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}
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// Free the local-bridge object
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void BrFreeBridge(BRIDGE *b)
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{
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// Validate arguments
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if (b == NULL)
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{
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return;
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}
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if (b->ParentLocalBridge != NULL)
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{
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b->ParentLocalBridge = NULL;
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}
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// Stop session thread
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StopSession(b->Session);
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ReleaseSession(b->Session);
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Free(b);
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}
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// Create new local-bridge
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BRIDGE *BrNewBridge(HUB *h, char *name, POLICY *p, bool local, bool monitor, bool tapmode, char *tapaddr, bool limit_broadcast, LOCALBRIDGE *parent_local_bridge)
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{
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BRIDGE *b;
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POLICY *policy;
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THREAD *t;
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// Validate arguments
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if (h == NULL || name == NULL || parent_local_bridge == NULL)
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{
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return NULL;
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}
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if (p == NULL)
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{
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policy = ClonePolicy(GetDefaultPolicy());
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}
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else
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{
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policy = ClonePolicy(p);
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}
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b = ZeroMalloc(sizeof(BRIDGE));
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b->Cedar = h->Cedar;
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b->Hub = h;
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StrCpy(b->Name, sizeof(b->Name), name);
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b->Policy = policy;
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b->Local = local;
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b->Monitor = monitor;
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b->TapMode = tapmode;
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b->LimitBroadcast = limit_broadcast;
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b->ParentLocalBridge = parent_local_bridge;
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if (b->TapMode)
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{
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if (tapaddr != NULL && IsZero(tapaddr, 6) == false)
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{
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Copy(b->TapMacAddress, tapaddr, 6);
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}
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else
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{
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GenMacAddress(b->TapMacAddress);
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}
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}
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if (monitor)
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{
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// Enabling monitoring mode
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policy->MonitorPort = true;
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}
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if (b->LimitBroadcast == false)
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{
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// Disable broadcast limiter
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policy->NoBroadcastLimiter = true;
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}
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// Start thread
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t = NewThread(BrBridgeThread, b);
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WaitThreadInit(t);
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ReleaseThread(t);
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return b;
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}
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// Raw IP bridge is supported only on Linux
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bool IsRawIpBridgeSupported()
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{
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#ifdef UNIX_LINUX
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return true;
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#else // UNIX_LINUX
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return false;
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#endif // UNIX_LINUX
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}
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