--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include "../src/meshlink++.h"
+
+static void log_message(meshlink::mesh *mesh, meshlink::log_level_t level, const char *text) {
+ const char *levelstr[] = {"DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"};
+ fprintf(stderr, "%s: %s\n", levelstr[level], text);
+}
+
+static void receive(meshlink::mesh *mesh, meshlink::node *source, const void *data, size_t len) {
+ const char *msg = (const char *)data;
+
+ if(!len || msg[len - 1]) {
+ fprintf(stderr, "Received invalid data from %s\n", source->name);
+ return;
+ }
+
+ printf("%s says: %s\n", source->name, msg);
+}
+
+static void node_status(meshlink::mesh *mesh, meshlink::node *node, bool reachable) {
+ if(reachable)
+ printf("%s joined.\n", node->name);
+ else
+ printf("%s left.\n", node->name);
+}
+
+static void parse_command(meshlink::mesh *mesh, char *buf) {
+ char *arg = strchr(buf, ' ');
+ if(arg)
+ *arg++ = 0;
+
+ if(!strcasecmp(buf, "invite")) {
+ char *invitation;
+
+ if(!arg) {
+ fprintf(stderr, "/invite requires an argument!\n");
+ return;
+ }
+
+ invitation = mesh->invite(arg);
+ if(!invitation) {
+ fprintf(stderr, "Could not invite '%s': %s\n", arg, mesh->errstr);
+ return;
+ }
+
+ printf("Invitation for %s: %s\n", arg, invitation);
+ free(invitation);
+ } else if(!strcasecmp(buf, "join")) {
+ if(!arg) {
+ fprintf(stderr, "/join requires an argument!\n");
+ return;
+ }
+
+ if(!mesh->join(arg))
+ fprintf(stderr, "Could not join using invitation: %s\n", mesh->errstr);
+ else
+ fprintf(stderr, "Invitation accepted!\n");
+ } else if(!strcasecmp(buf, "kick")) {
+ if(!arg) {
+ fprintf(stderr, "/kick requires an argument!\n");
+ return;
+ }
+
+ meshlink::node *node = mesh->get_node(arg);
+ if(!node) {
+ fprintf(stderr, "Unknown node '%s'\n", arg);
+ return;
+ }
+
+ mesh->blacklist(node);
+
+ printf("Node '%s' blacklisted.\n", arg);
+ } else if(!strcasecmp(buf, "who")) {
+ if(!arg) {
+ meshlink::node *nodes[100];
+ size_t n = mesh->get_all_nodes(nodes, 100);
+ if(!n) {
+ fprintf(stderr, "No nodes known!\n");
+ } else {
+ printf("Known nodes:");
+ for(int i = 0; i < n && i < 100; i++)
+ printf(" %s", nodes[i]->name);
+ if(n > 100)
+ printf(" (and %zu more)", n - 100);
+ printf("\n");
+ }
+ } else {
+ meshlink::node *node = mesh->get_node(arg);
+ if(!node) {
+ fprintf(stderr, "Unknown node '%s'\n", arg);
+ } else {
+ printf("Node %s found\n", arg);
+ }
+ }
+ } else if(!strcasecmp(buf, "quit")) {
+ printf("Bye!\n");
+ fclose(stdin);
+ } else if(!strcasecmp(buf, "help")) {
+ printf(
+ "<name>: <message> Send a message to the given node.\n"
+ " Subsequent messages don't need the <name>: prefix.\n"
+ "/invite <name> Create an invitation for a new node.\n"
+ "/join <invitation> Join an existing mesh using an invitation.\n"
+ "/kick <name> Blacklist the given node.\n"
+ "/who [<name>] List all nodes or show information about the given node.\n"
+ "/quit Exit this program.\n"
+ );
+ } else {
+ fprintf(stderr, "Unknown command '/%s'\n", buf);
+ }
+}
+
+static void parse_input(meshlink::mesh *mesh, char *buf) {
+ static meshlink::node *destination;
+ size_t len;
+
+ if(!buf)
+ return;
+
+ // Remove newline.
+
+ len = strlen(buf);
+
+ if(len && buf[len - 1] == '\n')
+ buf[--len] = 0;
+
+ if(len && buf[len - 1] == '\r')
+ buf[--len] = 0;
+
+ // Ignore empty lines.
+
+ if(!len)
+ return;
+
+ // Commands start with '/'
+
+ if(*buf == '/')
+ return parse_command(mesh, buf + 1);
+
+ // Lines in the form "name: message..." set the destination node.
+
+ char *msg = buf;
+ char *colon = strchr(buf, ':');
+
+ if(colon) {
+ *colon = 0;
+ msg = colon + 1;
+ if(*msg == ' ')
+ msg++;
+
+ destination = mesh->get_node(buf);
+ if(!destination) {
+ fprintf(stderr, "Unknown node '%s'\n", buf);
+ return;
+ }
+ }
+
+ if(!destination) {
+ fprintf(stderr, "Who are you talking to? Write 'name: message...'\n");
+ return;
+ }
+
+ if(!mesh->send(destination, msg, strlen(msg) + 1)) {
+ fprintf(stderr, "Could not send message to '%s': %s\n", destination->name, mesh->errstr);
+ return;
+ }
+
+ printf("Message sent to '%s'.\n", destination->name);
+}
+
+int main(int argc, char *argv[]) {
+ const char *confbase = ".chat";
+ const char *nick = NULL;
+ char buf[1024];
+
+ if(argc > 1)
+ confbase = argv[1];
+
+ if(argc > 2)
+ nick = argv[2];
+
+ meshlink::mesh *mesh = meshlink::open(confbase, nick);
+ if(!mesh) {
+ fprintf(stderr, "Could not open MeshLink!\n");
+ return 1;
+ }
+
+ mesh->set_receive_cb(receive);
+ mesh->set_node_status_cb(node_status);
+ mesh->set_log_cb(MESHLINK_INFO, log_message);
+
+ if(!mesh->start()) {
+ fprintf(stderr, "Could not start MeshLink: %s\n", mesh->errstr);
+ return 1;
+ }
+
+ printf("Chat started.\nType /help for a list of commands.\n");
+
+ while(fgets(buf, sizeof buf, stdin))
+ parse_input(mesh, buf);
+
+ printf("Chat stopping.\n");
+
+ mesh->stop();
+ meshlink::close(mesh);
+
+ return 0;
+}
--- /dev/null
+/*
+ meshlink++.h -- MeshLink C++ API
+ Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef MESHLINKPP_H
+#define MESHLINKPP_H
+
+#include <meshlink.h>
+
+namespace meshlink {
+ class mesh;
+ class node;
+
+ /// Severity of log messages generated by MeshLink.
+ typedef meshlink_log_level_t log_level_t;
+
+ /// Code of most recent error encountered.
+ typedef meshlink_errno_t errno_t;
+
+ /// A callback for receiving data from the mesh.
+ /** @param mesh A handle which represents an instance of MeshLink.
+ * @param source A pointer to a meshlink::node describing the source of the data.
+ * @param data A pointer to a buffer containing the data sent by the source.
+ * @param len The length of the received data.
+ */
+ typedef void (*receive_cb_t)(mesh *mesh, node *source, const void *data, size_t len);
+
+ /// A callback reporting node status changes.
+ /** @param mesh A handle which represents an instance of MeshLink.
+ * @param node A pointer to a meshlink::node describing the node whose status changed.
+ * @param reachable True if the node is reachable, false otherwise.
+ */
+ typedef void (*node_status_cb_t)(mesh *mesh, node *node, bool reachable);
+
+ /// A callback for receiving log messages generated by MeshLink.
+ /** @param mesh A handle which represents an instance of MeshLink.
+ * @param level An enum describing the severity level of the message.
+ * @param text A pointer to a string containing the textual log message.
+ */
+ typedef void (*log_cb_t)(mesh *mesh, log_level_t level, const char *text);
+
+ /// A class describing a MeshLink node.
+ class node: public meshlink_node_t {
+ };
+
+ /// A class describing a MeshLink mesh.
+ class mesh: public meshlink_handle_t {
+ public:
+ // TODO: delete constructor, add a destructor.
+
+ /// Start MeshLink.
+ /** This function causes MeshLink to open network sockets, make outgoing connections, and
+ * create a new thread, which will handle all network I/O.
+ *
+ * @return This function will return true if MeshLink has succesfully started its thread, false otherwise.
+ */
+ bool start() {
+ return meshlink_start(this);
+ }
+
+ /// Stop MeshLink.
+ /** This function causes MeshLink to disconnect from all other nodes,
+ * close all sockets, and shut down its own thread.
+ */
+ void stop() {
+ meshlink_stop(this);
+ }
+
+ /// Set the receive callback.
+ /** This functions sets the callback that is called whenever another node sends data to the local node.
+ * The callback is run in MeshLink's own thread.
+ * It is therefore important that the callback uses apprioriate methods (queues, pipes, locking, etc.)
+ * to hand the data over to the application's thread.
+ * The callback should also not block itself and return as quickly as possible.
+ *
+ * @param cb A pointer to the function which will be called when another node sends data to the local node.
+ */
+ void set_receive_cb(receive_cb_t cb) {
+ meshlink_set_receive_cb(this, (meshlink_receive_cb_t)cb);
+ }
+
+ /// Set the node status callback.
+ /** This functions sets the callback that is called whenever another node's status changed.
+ * The callback is run in MeshLink's own thread.
+ * It is therefore important that the callback uses apprioriate methods (queues, pipes, locking, etc.)
+ * to hand the data over to the application's thread.
+ * The callback should also not block itself and return as quickly as possible.
+ *
+ * @param cb A pointer to the function which will be called when another node's status changes.
+ */
+ void set_node_status_cb(node_status_cb_t cb) {
+ meshlink_set_node_status_cb(this, (meshlink_node_status_cb_t)cb);
+ }
+
+ /// Set the log callback.
+ /** This functions sets the callback that is called whenever MeshLink has some information to log.
+ * The callback is run in MeshLink's own thread.
+ * It is important that the callback uses apprioriate methods (queues, pipes, locking, etc.)
+ * to hand the data over to the application's thread.
+ * The callback should also not block itself and return as quickly as possible.
+ *
+ * @param level An enum describing the minimum severity level. Debugging information with a lower level will not trigger the callback.
+ * @param cb A pointer to the function which will be called when another node sends data to the local node.
+ */
+ void set_log_cb(meshlink_log_level_t level, log_cb_t cb) {
+ meshlink_set_log_cb(this, level, (meshlink_log_cb_t)cb);
+ }
+
+ /// Send data to another node.
+ /** This functions sends one packet of data to another node in the mesh.
+ * The packet is sent using UDP semantics, which means that
+ * the packet is sent as one unit and is received as one unit,
+ * and that there is no guarantee that the packet will arrive at the destination.
+ * The application should take care of getting an acknowledgement and retransmission if necessary.
+ *
+ * @param destination A pointer to a meshlink::node describing the destination for the data.
+ * @param data A pointer to a buffer containing the data to be sent to the source.
+ * @param len The length of the data.
+ * @return This function will return true if MeshLink has queued the message for transmission, and false otherwise.
+ * A return value of true does not guarantee that the message will actually arrive at the destination.
+ */
+ bool send(node *destination, const void *data, unsigned int len) {
+ return meshlink_send(this, destination, data, len);
+ }
+
+ /// Get a handle for a specific node.
+ /** This function returns a handle for the node with the given name.
+ *
+ * @param name The name of the node for which a handle is requested.
+ *
+ * @return A pointer to a meshlink::node which represents the requested node,
+ * or NULL if the requested node does not exist.
+ */
+ node *get_node(const char *name) {
+ return (node *)meshlink_get_node(this, name);
+ }
+
+ /// Get a list of all nodes.
+ /** This function returns a list with handles for all known nodes.
+ *
+ * @param nodes A pointer to an array of pointers to meshlink::node, which should be allocated by the application.
+ * @param nmemb The maximum number of pointers that can be stored in the nodes array.
+ *
+ * @param return The number of known nodes. This can be larger than nmemb, in which case not all nodes were stored in the nodes array.
+ */
+ size_t get_all_nodes(node **nodes, size_t nmemb) {
+ return meshlink_get_all_nodes(this, (meshlink_node_t **)nodes, nmemb);
+ }
+
+ /// Sign data using the local node's MeshLink key.
+ /** This function signs data using the local node's MeshLink key.
+ * The generated signature can be securely verified by other nodes.
+ *
+ * @param data A pointer to a buffer containing the data to be signed.
+ * @param len The length of the data to be signed.
+ *
+ * @return This function returns a pointer to a string containing the signature, or NULL in case of an error.
+ * The application should call free() after it has finished using the signature.
+ */
+ char *sign(const char *data, size_t len) {
+ return meshlink_sign(this, data, len);
+ }
+
+ /// Verify the signature generated by another node of a piece of data.
+ /** This function verifies the signature that another node generated for a piece of data.
+ *
+ * @param source A pointer to a meshlink_node_t describing the source of the signature.
+ * @param data A pointer to a buffer containing the data to be verified.
+ * @param len The length of the data to be verified.
+ * @param signature A pointer to a string containing the signature.
+ *
+ * @return This function returns true if the signature is valid, false otherwise.
+ */
+ bool verify(node *source, const char *data, size_t len, const char *signature) {
+ return meshlink_verify(this, source, data, len, signature);
+ }
+
+ /// Add an Address for the local node.
+ /** This function adds an Address for the local node, which will be used for invitation URLs.
+ *
+ * @param address A string containing the address, which can be either in numeric format or a hostname.
+ *
+ * @return This function returns true if the address was added, false otherwise.
+ */
+ bool add_address(const char *address) {
+ return meshlink_add_address(this, address);
+ }
+
+ /// Invite another node into the mesh.
+ /** This function generates an invitation that can be used by another node to join the same mesh as the local node.
+ * The generated invitation is a string containing a URL.
+ * This URL should be passed by the application to the invitee in a way that no eavesdroppers can see the URL.
+ * The URL can only be used once, after the user has joined the mesh the URL is no longer valid.
+ *
+ * @param name The name that the invitee will use in the mesh.
+ *
+ * @return This function returns a string that contains the invitation URL.
+ * The application should call free() after it has finished using the URL.
+ */
+ char *invite(const char *name) {
+ return meshlink_invite(this, name);
+ }
+
+ /// Use an invitation to join a mesh.
+ /** This function allows the local node to join an existing mesh using an invitation URL generated by another node.
+ * An invitation can only be used if the local node has never connected to other nodes before.
+ * After a succesfully accepted invitation, the name of the local node may have changed.
+ *
+ * @param invitation A string containing the invitation URL.
+ *
+ * @return This function returns true if the local node joined the mesh it was invited to, false otherwise.
+ */
+ bool join(const char *invitation) {
+ return meshlink_join(this, invitation);
+ }
+
+ /// Export the local node's key and addresses.
+ /** This function generates a string that contains the local node's public key and one or more IP addresses.
+ * The application can pass it in some way to another node, which can then import it,
+ * granting the local node access to the other node's mesh.
+ *
+ * @return This function returns a string that contains the exported key and addresses.
+ * The application should call free() after it has finished using this string.
+ */
+ char *export_key() {
+ return meshlink_export(this);
+ }
+
+ /// Import another node's key and addresses.
+ /** This function accepts a string containing the exported public key and addresses of another node.
+ * By importing this data, the local node grants the other node access to its mesh.
+ *
+ * @param data A string containing the other node's exported key and addresses.
+ *
+ * @return This function returns true if the data was valid and the other node has been granted access to the mesh, false otherwise.
+ */
+ bool import_key(const char *data) {
+ return meshlink_import(this, data);
+ }
+
+ /// Blacklist a node from the mesh.
+ /** This function causes the local node to blacklist another node.
+ * The local node will drop any existing connections to that node,
+ * and will not send data to it nor accept any data received from it any more.
+ *
+ * @param node A pointer to a meshlink::node describing the node to be blacklisted.
+ */
+ void blacklist(node *node) {
+ return meshlink_blacklist(this, node);
+ }
+ };
+
+ /// Initialize MeshLink's configuration directory.
+ /** This function causes MeshLink to initialize its configuration directory,
+ * if it hasn't already been initialized.
+ * It only has to be run the first time the application starts,
+ * but it is not a problem if it is run more than once, as long as
+ * the arguments given are the same.
+ *
+ * This function does not start any network I/O yet. The application should
+ * first set callbacks, and then call meshlink_start().
+ *
+ * @param confbase The directory in which MeshLink will store its configuration files.
+ * @param name The name which this instance of the application will use in the mesh.
+ *
+ * @return This function will return a pointer to a meshlink::mesh if MeshLink has succesfully set up its configuration files, NULL otherwise.
+ */
+ static mesh *open(const char *confbase, const char *name) {
+ return (mesh *)meshlink_open(confbase, name);
+ }
+
+ /// Close the MeshLink handle.
+ /** This function calls meshlink_stop() if necessary,
+ * and frees all memory allocated by MeshLink.
+ * Afterwards, the handle and any pointers to a struct meshlink_node are invalid.
+ */
+ static void close(mesh *mesh) {
+ meshlink_close(mesh);
+ }
+};
+
+#endif // MESHLINKPP_H
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