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https://github.com/hsluoyz/userbridge
A user-mode bridge based on Npcap/WinPcap
https://github.com/hsluoyz/userbridge
bridge firewall npcap npcap-sdk packets winpcap
Last synced: 3 days ago
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A user-mode bridge based on Npcap/WinPcap
- Host: GitHub
- URL: https://github.com/hsluoyz/userbridge
- Owner: hsluoyz
- License: mit
- Created: 2016-02-16T08:39:20.000Z (almost 9 years ago)
- Default Branch: master
- Last Pushed: 2023-06-17T18:46:11.000Z (over 1 year ago)
- Last Synced: 2024-12-03T15:49:58.309Z (19 days ago)
- Topics: bridge, firewall, npcap, npcap-sdk, packets, winpcap
- Language: C
- Size: 11.7 KB
- Stars: 23
- Watchers: 5
- Forks: 8
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# UserBridge
A user-mode bridge based on [Npcap](https://github.com/nmap/npcap)/[WinPcap](https://www.winpcap.org)
# Build
1. Get [WinPcap 4.1.2 Developer's Pack](https://www.winpcap.org/devel.htm)
2. Build ``UserBridge.sln`` with **Visual Studio 2013**
# Usage
Launch the executable ``UserBridge.exe``, you will see a list of adapters like:
```
1. Network adapter 'Microsoft' on local host
2. Network adapter 'Intel(R) 82574L Gigabit Network Connection' on local host
3. Network adapter 'MS NDIS 6.0 LoopBack Driver' on local host
Specify filter (hit return for no filter):
```
Press ``Enter``.
```
Enter the number of the first interface to use (1-3):
```
Type in the index of the first adapter and press ``Enter``.
```
Enter the number of the second interface to use (1-3):
```
Type in the index of the second adapter and press ``Enter``.
```
Start bridging the two adapters...
```
If the bridging succeeds, you will see a lot of lines coming up in the prompt like:
```
>> Len: 142
>> Len: 94
>> Len: 142
>> Len: 142
>> Len: 94
<< Len: 142
<< Len: 142
<< Len: 142
<< Len: 94
<< Len: 142
<< Len: 142
<< Len: 142
<< Len: 142
<< Len: 142
```
All these lines show the traffic flow handled by the bridge. Line ``Len: 142`` means there's a packet with 142 bytes is handled.
# How to make a bridge?
If you want all received traffic on ``Adapter A`` seems like to be received on ``Adapter B``, and all traffic sent out from ``Adapter B`` to be actually sent out from ``Adapter A``, you can realize this by using ``UserBridge`` and ``Npcap``. You need to do two steps:
1. Specify ``Adapter B`` as a ``Send-to-Rx`` adapter in ``Npcap`` (see [v0.05-r6](https://github.com/nmap/npcap/releases/tag/v0.05-r6) and [v0.05-r7](https://github.com/nmap/npcap/releases/tag/v0.05-r7) for ``Send-to-Rx``'s details).
2. Specify ``Adapter A`` as the first interface and ``Adapter B`` as the second interface in ``UserBridge``.
# How to make a firewall?
If you want all received traffic on ``Adapter A`` get filtered by ``UserBridge``, and drop the packets you don't want like a firewall. You need to do two steps:
1. Specify ``Adapter A`` as both a ``Block-Rx`` and a ``Send-to-Rx`` adapter in ``Npcap`` (see [v0.05-r11](https://github.com/nmap/npcap/releases/tag/v0.05-r11) for ``Block-Rx``'s details).
2. Specify ``Adapter A`` as both the first interface and second interface in ``UserBridge``.