libzt

Embed ZeroTier directly into your app

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A library version of the popular ZeroTier One, 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 or framework. We provide a BSD socket-like API supporting SOCK_STREAM, SOCK_DGRAM, and SOCK_RAW to make the integration simple. There's also no longer any need for system-wide virtual interfaces. This connection is exclusive to your app and fully encrypted via the Salsa20 cipher.

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Pre-Built Binaries Here: zerotier.com/download.shtml.

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Example

#include "libzt.h"

char *str = "welcome to the machine";
char *nwid = "c7cd7c9e1b0f52a2";      // network to join
char *path = "zt1";                   // path where this node's keys and configs will be stored
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 = hton(port);	

zts_simple_start(path, nwid);

int fd, err = 0;
if ((fd = zts_socket(AF_INET, SOCK_STREAM, 0)) < 0) {
	printf("error creating socket\n");
	return -1;
}
if ((err = zts_connect(fd, (const struct sockaddr *)addr, sizeof(addr))) < 0) {
	printf("error connecting to remote host\n");
	return -1;
}
if ((err = zts_write(fd, str, strlen(str))) < 0) {
	printf("error writing to socket\n");
	return -1;
}
if ((err = zts_close(fd)) < 0) {
	printf("error closing socket\n");
	return -1;
}

zts_stop();

Bindings for various languages

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

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Building (linux, macos, bsd, win, ios)

git submodule init
git submodule update
make static_lib
make tests

All targets will output to build/. Complete instructions here

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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.

License

• Commercial, with BSD license, build using lwIP network stack with STACK_LWIP=1, then contact us directly via contact@zerotier.com to discuss commercial licensing.
• Personal, with GPL license, build using picoTCP network stack with STACK_PICO=1, everything is free. Have fun.

Regardless of which network stack you build with, the socket API will remain the same.