libzt

Embed ZeroTier directly into your app

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A library version of ZeroTier, 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 cipher. For a more in-depth discussion on the technical side of ZeroTier, check out our Manual

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• Pre-Built binaries: zerotier.com/download.shtml
• Windows DLL (x64) can be found here: libzt_win_x64_1.1.5.zip
• Bindings for popular languages like Scala, Swift, Java, Python, etc. can be found here

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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 *ip = "10.8.8.42";               // remote address
	int port = 8080;                      // remote port

	struct sockaddr_in addr;
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = inet_addr(ip);
	addr.sin_port = htons(port);	

	zts_startjoin("path", 0xc7cd7c981b0f52a2); // config path, nwid

	int fd, err = 0;
	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");
	}
	if ((err = zts_close(fd)) < 0) {
		printf("error closing socket\n");
	}
	zts_stop();
	return 0;
}

For an example using only the Virtual Layer 2, see test/layer2.cpp

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Build

We recommend using CMake for its extensive cross-platform build support.

git submodule init
git submodule update
cmake -H. -Bbuild -DCMAKE_BUILD_TYPE=DEBUG
cmake --build build 

Use libzt.a or libzt.dylib in your application. They are placed in bin\lib. Change CMAKE_BUILD_TYPE to RELEASE for a smaller and optmized build.

Install

• Install: make install
• Uninstall: xargs rm < install_manifest.txt

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Testing and Debugging

• See TESTING.md

Contributing

Please make pull requests against the dev branch. The master branch is release, and edge is for unstable and work in progress changes and is not likely to work.

Commercial License

• If you want a commercial license to use libzt in your product contact us directly via contact@zerotier.com.

Adding a custom network stack

• If you wish to use something other than lwIP or picoTCP, you can easily add your own API function calls in src/libzt.cpp or src/VirtualSocket.cpp depending on whether your stack's API exposes a POSIX-socket API or a raw API, respectively.