393 lines
14 KiB
C++
393 lines
14 KiB
C++
/**
|
|
* libzt API example
|
|
*
|
|
* For more straight-to-the-point examples, see the other files in this same directory.
|
|
*/
|
|
|
|
/**
|
|
*
|
|
* IDENTITIES and AUTHORIZATION:
|
|
*
|
|
* - Upon the first execution of this code, a new identity will be generated and placed in
|
|
* the location given in the first argument to zts_start(path, ...). If you accidentally
|
|
* duplicate the identity files and use them simultaneously in a different node instance
|
|
* you will experience undefined behavior and it is likely nothing will work.
|
|
*
|
|
* - You must authorize the node ID provided by the ZTS_EVENT_NODE_ONLINE callback to join
|
|
* your network, otherwise nothing will happen. This can be done manually or via
|
|
* our web API: https://my.zerotier.com/help/api
|
|
*
|
|
* - An exception to the above rule is if you are using an Ad-hoc network, it has no
|
|
* controller and therefore requires no authorization.
|
|
*
|
|
*
|
|
* ESTABLISHING A CONNECTION:
|
|
*
|
|
* - Creating a standard socket connection generally works the same as it would using
|
|
* an ordinary socket interface, however with libzt there is a subtle difference in
|
|
* how connections are established which may cause confusion:
|
|
*
|
|
* The underlying virtual ZT layer creates what are called "transport-triggered links"
|
|
* between nodes. That is, links are not established until an attempt to communicate
|
|
* with a peer has taken place. The side effect is that the first few packets sent from
|
|
* a libzt instance are usually relayed via our free infrastructure and it isn't until a
|
|
* root server has passed contact information to both peers that a direct connection will be
|
|
* established. Therefore, it is required that multiple connection attempts be undertaken
|
|
* when initially communicating with a peer. After a transport-triggered link is
|
|
* established libzt will inform you via ZTS_EVENT_PEER_P2P for a specific peer ID. No
|
|
* action is required on your part for this callback event.
|
|
*
|
|
* Note: In these initial moments before ZTS_EVENT_PEER_P2P has been received for a
|
|
* specific peer, traffic may be slow, jittery and there may be high packet loss.
|
|
* This will subside within a couple of seconds.
|
|
*
|
|
*
|
|
* ERROR HANDLING:
|
|
*
|
|
* - libzt's API is actually composed of two categories of functions with slightly
|
|
* different error reporting mechanisms.
|
|
*
|
|
* Category 1: Control functions (zts_start, zts_join, zts_get_peer_status, etc). Errors
|
|
* returned by these functions can be any of the following:
|
|
*
|
|
* [ 0] ZTS_ERR_OK - No error.
|
|
* [-1] ZTS_ERR - Error (see zts_errno for more information).
|
|
* [-2] ZTS_ERR_INVALID_ARG - An argument provided is invalid.
|
|
* [-3] ZTS_ERR_SERVICE - ZT is not yet initialized. Try again.
|
|
* [-4] ZTS_ERR_INVALID_OP - Operation is not permitted (Doesn't make sense in this state).
|
|
* [-5] ZTS_ERR_NO_RESULT - Call succeeded but no result was available. Not always an error.
|
|
* [-6] ZTS_ERR_GENERAL - General internal failure. Consider filing a bug report.
|
|
*
|
|
* Category 2: Sockets (zts_socket, zts_bind, zts_connect, zts_listen, etc).
|
|
* Errors returned by these functions can be the same as the above. With
|
|
* the added possibility of zts_errno being set. Much like standard
|
|
* errno this will provide a more specific reason for an error's occurrence.
|
|
* These error values are defined in: libzt/ext/lwip/src/include/lwip/errno.h
|
|
* and closely map to standard Linux error values.
|
|
*
|
|
*
|
|
* API COMPATIBILITY WITH HOST OS:
|
|
*
|
|
* - Since libzt re-implements a socket API probably very similar to your host OS's own
|
|
* API it may be tempting to mix and match host OS structures and functions with those
|
|
* of libzt. This may work on occasion, but you are tempting fate, so here are a few
|
|
* guidelines:
|
|
*
|
|
* If you are calling a zts_* function, use the appropriate ZTS_* constants:
|
|
*
|
|
* zts_socket(ZTS_AF_INET6, ZTS_SOCK_DGRAM, 0); (CORRECT)
|
|
* zts_socket(AF_INET6, SOCK_DGRAM, 0); (INCORRECT)
|
|
*
|
|
* If you are calling a zts_* function, use the appropriate zts_* structure:
|
|
*
|
|
* struct zts_sockaddr_in in4; <------ Note the zts_* prefix
|
|
* ...
|
|
* zts_bind(fd, (struct sockaddr *)&in4, sizeof(struct zts_sockaddr_in)) < 0)
|
|
*
|
|
* If you are calling a host OS function, use your host OS's constants (and structures!):
|
|
*
|
|
* inet_ntop(AF_INET6, &(in6->sin6_addr), ...); (CORRECT)
|
|
* inet_ntop(ZTS_AF_INET6, &(in6->sin6_addr), ...); (INCORRECT)
|
|
*
|
|
* If you are calling a host OS function but passing a zts_* structure, this can
|
|
* work sometimes but you should take care to pass the correct host OS constants:
|
|
*
|
|
* struct zts_sockaddr_in6 in6;
|
|
* ...
|
|
* inet_ntop(AF_INET6, &(in6->sin6_addr), dstStr, INET6_ADDRSTRLEN);
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <string>
|
|
#include <inttypes.h>
|
|
#include <stdlib.h>
|
|
|
|
#if defined(_WIN32)
|
|
#include <WinSock2.h>
|
|
#include <stdint.h>
|
|
#else
|
|
#include <netinet/in.h>
|
|
#include <sys/socket.h>
|
|
#include <netdb.h>
|
|
#include <arpa/inet.h>
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
void delay_ms(long ms)
|
|
{
|
|
#if defined(_WIN32)
|
|
Sleep(ms);
|
|
#else
|
|
usleep(ms*1000);
|
|
#endif
|
|
}
|
|
|
|
#include "ZeroTier.h"
|
|
|
|
bool nodeReady = false;
|
|
bool networkReady = false;
|
|
|
|
// Example callbacks
|
|
void myZeroTierEventCallback(struct zts_callback_msg *msg)
|
|
{
|
|
// Node events
|
|
if (msg->eventCode == ZTS_EVENT_NODE_ONLINE) {
|
|
printf("ZTS_EVENT_NODE_ONLINE --- This node's ID is %llx\n", msg->node->address);
|
|
nodeReady = true;
|
|
}
|
|
if (msg->eventCode == ZTS_EVENT_NODE_OFFLINE) {
|
|
printf("ZTS_EVENT_NODE_OFFLINE --- Check your physical Internet connection, router, firewall, etc. What ports are you blocking?\n");
|
|
nodeReady = false;
|
|
}
|
|
if (msg->eventCode == ZTS_EVENT_NODE_NORMAL_TERMINATION) {
|
|
printf("ZTS_EVENT_NODE_NORMAL_TERMINATION\n");
|
|
}
|
|
|
|
// Virtual network events
|
|
if (msg->eventCode == ZTS_EVENT_NETWORK_NOT_FOUND) {
|
|
printf("ZTS_EVENT_NETWORK_NOT_FOUND --- Are you sure %llx is a valid network?\n",
|
|
msg->network->nwid);
|
|
}
|
|
if (msg->eventCode == ZTS_EVENT_NETWORK_REQUESTING_CONFIG) {
|
|
printf("ZTS_EVENT_NETWORK_REQUESTING_CONFIG --- Requesting config for network %llx, please wait a few seconds...\n", msg->network->nwid);
|
|
}
|
|
if (msg->eventCode == ZTS_EVENT_NETWORK_ACCESS_DENIED) {
|
|
printf("ZTS_EVENT_NETWORK_ACCESS_DENIED --- Access to virtual network %llx has been denied. Did you authorize the node yet?\n",
|
|
msg->network->nwid);
|
|
}
|
|
if (msg->eventCode == ZTS_EVENT_NETWORK_READY_IP4) {
|
|
printf("ZTS_EVENT_NETWORK_READY_IP4 --- Network config received. IPv4 traffic can now be sent over network %llx\n",
|
|
msg->network->nwid);
|
|
networkReady = true;
|
|
}
|
|
if (msg->eventCode == ZTS_EVENT_NETWORK_READY_IP6) {
|
|
printf("ZTS_EVENT_NETWORK_READY_IP6 --- Network config received. IPv6 traffic can now be sent over network %llx\n",
|
|
msg->network->nwid);
|
|
networkReady = true;
|
|
}
|
|
if (msg->eventCode == ZTS_EVENT_NETWORK_DOWN) {
|
|
printf("ZTS_EVENT_NETWORK_DOWN --- %llx\n", msg->network->nwid);
|
|
}
|
|
|
|
// Network stack events
|
|
if (msg->eventCode == ZTS_EVENT_NETIF_UP) {
|
|
printf("ZTS_EVENT_NETIF_UP --- network=%llx, mac=%llx, mtu=%d\n",
|
|
msg->netif->nwid,
|
|
msg->netif->mac,
|
|
msg->netif->mtu);
|
|
networkReady = true;
|
|
}
|
|
if (msg->eventCode == ZTS_EVENT_NETIF_DOWN) {
|
|
printf("ZTS_EVENT_NETIF_DOWN --- network=%llx, mac=%llx\n",
|
|
msg->netif->nwid,
|
|
msg->netif->mac);
|
|
|
|
networkReady = true;
|
|
}
|
|
|
|
// Address events
|
|
if (msg->eventCode == ZTS_EVENT_ADDR_ADDED_IP4) {
|
|
char ipstr[INET_ADDRSTRLEN];
|
|
struct zts_sockaddr_in *in4 = (struct zts_sockaddr_in*)&(msg->addr->addr);
|
|
inet_ntop(AF_INET, &(in4->sin_addr), ipstr, INET_ADDRSTRLEN);
|
|
printf("ZTS_EVENT_ADDR_NEW_IP4 --- This node's virtual address on network %llx is %s\n",
|
|
msg->addr->nwid, ipstr);
|
|
}
|
|
if (msg->eventCode == ZTS_EVENT_ADDR_ADDED_IP6) {
|
|
char ipstr[INET6_ADDRSTRLEN];
|
|
struct zts_sockaddr_in6 *in6 = (struct zts_sockaddr_in6*)&(msg->addr->addr);
|
|
inet_ntop(AF_INET6, &(in6->sin6_addr), ipstr, INET6_ADDRSTRLEN);
|
|
printf("ZTS_EVENT_ADDR_NEW_IP6 --- This node's virtual address on network %llx is %s\n",
|
|
msg->addr->nwid, ipstr);
|
|
}
|
|
if (msg->eventCode == ZTS_EVENT_ADDR_REMOVED_IP4) {
|
|
char ipstr[INET_ADDRSTRLEN];
|
|
struct zts_sockaddr_in *in4 = (struct zts_sockaddr_in*)&(msg->addr->addr);
|
|
inet_ntop(AF_INET, &(in4->sin_addr), ipstr, INET_ADDRSTRLEN);
|
|
printf("ZTS_EVENT_ADDR_REMOVED_IP4 --- The virtual address %s for this node on network %llx has been removed.\n",
|
|
ipstr, msg->addr->nwid);
|
|
}
|
|
if (msg->eventCode == ZTS_EVENT_ADDR_REMOVED_IP6) {
|
|
char ipstr[INET6_ADDRSTRLEN];
|
|
struct zts_sockaddr_in6 *in6 = (struct zts_sockaddr_in6*)&(msg->addr->addr);
|
|
inet_ntop(AF_INET6, &(in6->sin6_addr), ipstr, INET6_ADDRSTRLEN);
|
|
printf("ZTS_EVENT_ADDR_REMOVED_IP6 --- The virtual address %s for this node on network %llx has been removed.\n",
|
|
ipstr, msg->addr->nwid);
|
|
}
|
|
|
|
// Peer events
|
|
if (msg->eventCode == ZTS_EVENT_PEER_P2P) {
|
|
printf("ZTS_EVENT_PEER_P2P --- node=%llx\n", msg->peer->address);
|
|
// A direct path is known for nodeId
|
|
}
|
|
if (msg->eventCode == ZTS_EVENT_PEER_RELAY) {
|
|
printf("ZTS_EVENT_PEER_RELAY --- node=%llx\n", msg->peer->address);
|
|
// No direct path is known for nodeId
|
|
}
|
|
}
|
|
|
|
void printPeerDetails(struct zts_peer_details *pd)
|
|
{
|
|
printf("\npeer=%llx, latency=%d, version=%d.%d.%d, pathCount=%d\n",
|
|
pd->address,
|
|
pd->latency,
|
|
pd->versionMajor,
|
|
pd->versionMinor,
|
|
pd->versionRev,
|
|
pd->pathCount);
|
|
// Print all known paths for each peer
|
|
for (unsigned int j=0; j<pd->pathCount; j++) {
|
|
char ipstr[INET6_ADDRSTRLEN];
|
|
int port = 0;
|
|
struct sockaddr *sa = (struct sockaddr *)&(pd->paths[j].address);
|
|
if (sa->sa_family == AF_INET) {
|
|
struct zts_sockaddr_in *in4 = (struct zts_sockaddr_in*)sa;
|
|
inet_ntop(AF_INET, &(in4->sin_addr), ipstr, INET_ADDRSTRLEN);
|
|
port = ntohs(in4->sin_port);
|
|
}
|
|
if (sa->sa_family == AF_INET6) {
|
|
struct zts_sockaddr_in6 *in6 = (struct zts_sockaddr_in6*)sa;
|
|
inet_ntop(AF_INET6, &(in6->sin6_addr), ipstr, INET6_ADDRSTRLEN);
|
|
}
|
|
printf("\tpath[%d]=%s, port=%d\n", j, ipstr, port);
|
|
}
|
|
}
|
|
|
|
void getSinglePeerDetails(uint64_t peerId)
|
|
{
|
|
struct zts_peer_details pd;
|
|
int err = zts_get_peer(&pd, peerId);
|
|
|
|
if (err == ZTS_ERR_OK) {
|
|
printf("(%d) call succeeded\n", err);
|
|
} if (err == ZTS_ERR_INVALID_ARG) {
|
|
printf("(%d) invalid argument\n", err);
|
|
return;
|
|
} if (err == ZTS_ERR_SERVICE) {
|
|
printf("(%d) error: service is unavailable\n", err);
|
|
return;
|
|
} if (err == ZTS_ERR_INVALID_OP) {
|
|
printf("(%d) error: invalid API operation\n", err);
|
|
return;
|
|
} if (err == ZTS_ERR_NO_RESULT) {
|
|
printf("(%d) error: object or result not found\n", err);
|
|
return;
|
|
}
|
|
if (err == 0) { // ZTS_ERR_OK
|
|
printPeerDetails(&pd);
|
|
}
|
|
}
|
|
|
|
// Similar to "zerotier-cli listpeers"
|
|
void getAllPeerDetails()
|
|
{
|
|
struct zts_peer_details pd[128];
|
|
/* This number should be large enough to handle the
|
|
expected number of peers. This call can also get
|
|
expensive for large numbers of peers. Consider using
|
|
get_peer(struct zts_peer_details *pds, uint64_t peerId)
|
|
instead */
|
|
unsigned int num = 128;
|
|
int err;
|
|
if ((err = zts_get_peers(pd, &num)) < 0) {
|
|
printf("error (%d)\n", err);
|
|
return;
|
|
}
|
|
if (num) {
|
|
printf("num=%d\n", num);
|
|
for (unsigned int i=0; i<num; i++) {
|
|
printPeerDetails(&pd[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
struct zts_stats_proto protoSpecificStats;
|
|
|
|
void display_stack_stats()
|
|
{
|
|
int err = 0;
|
|
// Count received pings
|
|
if ((err = zts_get_protocol_stats(ZTS_STATS_PROTOCOL_ICMP, &protoSpecificStats)) != ZTS_ERR_OK) {
|
|
printf("zts_get_proto_stats()=%d", err);
|
|
return;
|
|
}
|
|
printf("icmp.recv=%d\n", protoSpecificStats.recv);
|
|
// Count dropped TCP packets
|
|
if ((err = zts_get_protocol_stats(ZTS_STATS_PROTOCOL_TCP, &protoSpecificStats)) != ZTS_ERR_OK) {
|
|
printf("zts_get_proto_stats()=%d", err);
|
|
return;
|
|
}
|
|
printf("tcp.drop=%d\n", protoSpecificStats.drop);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
if (argc != 4) {
|
|
printf("\nlibzt example server\n");
|
|
printf("comprehensive <config_file_path> <nwid> <ztServicePort>\n");
|
|
exit(0);
|
|
}
|
|
uint64_t nwid = strtoull(argv[2],NULL,16); // Network ID to join
|
|
int ztServicePort = atoi(argv[3]); // Port ZT uses to send encrypted UDP packets to peers (try something like 9994)
|
|
|
|
// Bring up ZeroTier service and join network
|
|
|
|
int err = ZTS_ERR_OK;
|
|
|
|
// Disable caching of network details in networks.d
|
|
// (read function documentation before disabling!)
|
|
// zts_set_network_caching(false)
|
|
|
|
// Disable caching of peer details in peers.d
|
|
// (read function documentation before disabling!)
|
|
// zts_set_network_caching(false)
|
|
|
|
if((err = zts_start(argv[1], &myZeroTierEventCallback, ztServicePort)) != ZTS_ERR_OK) {
|
|
printf("Unable to start service, error = %d. Exiting.\n", err);
|
|
exit(1);
|
|
}
|
|
printf("Waiting for node to come online...\n");
|
|
while (!nodeReady) { delay_ms(50); }
|
|
printf("This node ID is %llx\n", zts_get_node_id());
|
|
printf("This node's identity is stored in %s\n", argv[1]);
|
|
|
|
if((err = zts_join(nwid)) != ZTS_ERR_OK) {
|
|
printf("Unable to join network, error = %d. Exiting.\n", err);
|
|
exit(1);
|
|
}
|
|
printf("Joining network %llx\n", nwid);
|
|
printf("Don't forget to authorize this device in my.zerotier.com or the web API!\n");
|
|
while (!networkReady) { delay_ms(50); }
|
|
|
|
// Get multiple peer's details
|
|
getAllPeerDetails();
|
|
|
|
// Get a single peer's details
|
|
uint64_t peerId = 0xabcdef1234;
|
|
getSinglePeerDetails(peerId);
|
|
int status = -1;
|
|
|
|
// Get status of the node/service
|
|
status = zts_get_node_status();
|
|
printf("zts_get_node_status()=%d\n", status);
|
|
|
|
// Get status of a network
|
|
status = zts_get_network_status(nwid);
|
|
printf("zts_get_network_status()=%d\n", status);
|
|
|
|
// Idle and just show callback events, stack statistics, etc
|
|
|
|
while (true) {
|
|
delay_ms(1000);
|
|
status = zts_get_node_status();
|
|
printf("zts_get_node_status()=%d\n", status);
|
|
display_stack_stats();
|
|
}
|
|
|
|
// Shut down service and stack threads
|
|
|
|
zts_stop();
|
|
return 0;
|
|
}
|