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zhangyang-libzt/README.md
Joseph Henry 006cc87ca6 Updated README
2018-07-27 16:50:21 -07:00

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# libzt
*Embed ZeroTier directly into your app*
***
<a href="https://www.zerotier.com/?pk_campaign=github_libzt"><img src="https://raw.githubusercontent.com/zerotier/ZeroTierOne/master/artwork/ZeroTierIcon.png" width="128" height="128" align="left" hspace="20" vspace="9"></a>
A library version of [ZeroTier](https://github.com/zerotier/ZeroTierOne), **libzt** makes it easy to securely connect devices, servers, cloud VMs, containers, and apps everywhere and manage them at scale. Now you can bake this ability directly into your app or service using your preferred language. We provide a POSIX-like socket API supporting `SOCK_STREAM`, `SOCK_DGRAM`, and `SOCK_RAW` to make the integration simple. There's no need for system-wide virtual interfaces. This connection is exclusive to your app and fully encrypted via the [Salsa20](https://en.wikipedia.org/wiki/Salsa20) cipher. For a more in-depth discussion on the technical side of ZeroTier, check out our [Manual](https://www.zerotier.com/manual.shtml?pk_campaign=github_libzt)
<hr>
[![irc](https://img.shields.io/badge/IRC-%23zerotier%20on%20freenode-orange.svg)](https://webchat.freenode.net/?channels=zerotier)
- Bindings for popular languages like [Scala](examples/scala), [Swift](examples/swift), [Java](examples/java), [Python](examples/python), etc. can be found [here](examples/)
***
### C++ Example
```
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include "libzt.h"
int main()
{
char *str = "welcome to the machine";
char *remoteIp = "10.8.8.42";
int remotePort = 8080;
int fd, err = 0;
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr(remoteIp);
addr.sin_port = htons(remotePort);
zts_startjoin("path", 0xc7cd7c981b0f52a2); // config path, network ID
if ((fd = zts_socket(AF_INET, SOCK_STREAM, 0)) < 0) {
printf("error creating socket\n");
}
if ((err = zts_connect(fd, (const struct sockaddr *)&addr, sizeof(addr))) < 0) {
printf("error connecting to remote host\n");
}
if ((err = zts_write(fd, str, strlen(str))) < 0) {
printf("error writing to socket\n");
}
zts_close(fd);
zts_stop();
return 0;
}
```
For an example using only the [Virtual Layer 2](https://www.zerotier.com/manual.shtml#2_2?pk_campaign=github_libzt), see [examples/layer2](examples/layer2/layer2.cpp)
***
### Build
We recommend using [CMake](https://cmake.org/) and [clang](https://en.wikipedia.org/wiki/Clang).
```
git submodule init
git submodule update
make patch
cmake -H. -Bbuild -DCMAKE_BUILD_TYPE=Debug
cmake --build build
```
Builds are placed in `bin\lib`. Change `CMAKE_BUILD_TYPE` to `Release` for a smaller and optimized build.
***
### Commercial License
If you want a commercial license to use libzt in your product contact us directly via `contact@zerotier.com`