--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include "../src/meshlink.h"
+
+#define CHAT_PORT 531
+
+static void log_message(meshlink_handle_t *mesh, meshlink_log_level_t level, const char *text) {
+ const char *levelstr[] = {
+ [MESHLINK_DEBUG] = "\x1b[34mDEBUG",
+ [MESHLINK_INFO] = "\x1b[32mINFO",
+ [MESHLINK_WARNING] = "\x1b[33mWARNING",
+ [MESHLINK_ERROR] = "\x1b[31mERROR",
+ [MESHLINK_CRITICAL] = "\x1b[31mCRITICAL",
+ };
+ fprintf(stderr, "%s:\x1b[0m %s\n", levelstr[level], text);
+}
+
+static void channel_receive(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
+ const char *msg = data;
+
+ if(!len) {
+ if(meshlink_errno)
+ fprintf(stderr, "Error while reading data from %s: %s\n", channel->node->name, meshlink_strerror(meshlink_errno));
+ else
+ fprintf(stderr, "Chat connection closed by %s\n", channel->node->name);
+
+ channel->node->priv = NULL;
+ meshlink_channel_close(mesh, channel);
+ return;
+ }
+
+ // TODO: we now have TCP semantics, don't expect exactly one message per receive call.
+ if(msg[len - 1]) {
+ fprintf(stderr, "Received invalid data from %s\n", channel->node->name);
+ return;
+ }
+
+ printf("%s says: %s\n", channel->node->name, msg);
+}
+
+static bool channel_accept(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint16_t port, const void *data, size_t len) {
+ // Only accept connections to the chat port
+ if(port != CHAT_PORT) {
+ fprintf(stderr, "Rejected incoming channel from '%s' to port %u\n", channel->node->name, port);
+ return false;
+ }
+
+ fprintf(stderr, "Accepted incoming channel from '%s'\n", channel->node->name);
+
+ // Remember the channel
+ channel->node->priv = channel;
+
+ // Set the receive callback
+ meshlink_set_channel_receive_cb(mesh, channel, channel_receive);
+
+ // Accept this channel
+ return true;
+}
+
+static void node_status(meshlink_handle_t *mesh, meshlink_node_t *node, bool reachable) {
+ if(reachable)
+ printf("%s joined.\n", node->name);
+ else
+ printf("%s left.\n", node->name);
+}
+
+static meshlink_node_t **nodes;
+static size_t nnodes;
+
+static void parse_command(meshlink_handle_t *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 = meshlink_invite(mesh, arg);
+ if(!invitation) {
+ fprintf(stderr, "Could not invite '%s': %s\n", arg, meshlink_strerror(meshlink_errno));
+ 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;
+ }
+ meshlink_stop(mesh);
+ if(!meshlink_join(mesh, arg))
+ fprintf(stderr, "Could not join using invitation: %s\n", meshlink_strerror(meshlink_errno));
+ else {
+ fprintf(stderr, "Invitation accepted!\n");
+ if(!meshlink_start(mesh)) {
+ fprintf(stderr, "Could not start MeshLink: %s\n", meshlink_strerror(meshlink_errno));
+ return;
+ }
+ }
+ } else if(!strcasecmp(buf, "kick")) {
+ if(!arg) {
+ fprintf(stderr, "/kick requires an argument!\n");
+ return;
+ }
+
+ meshlink_node_t *node = meshlink_get_node(mesh, arg);
+ if(!node) {
+ fprintf(stderr, "Error looking up '%s': %s\n", arg, meshlink_strerror(meshlink_errno));
+ return;
+ }
+
+ meshlink_blacklist(mesh, node);
+
+ printf("Node '%s' blacklisted.\n", arg);
+ } else if(!strcasecmp(buf, "who")) {
+ if(!arg) {
+ nodes = meshlink_get_all_nodes(mesh, nodes, &nnodes);
+ if(!nnodes) {
+ fprintf(stderr, "Could not get list of nodes: %s\n", meshlink_strerror(meshlink_errno));
+ } else {
+ printf("%zu known nodes:", nnodes);
+ for(int i = 0; i < nnodes; i++)
+ printf(" %s", nodes[i]->name);
+ printf("\n");
+ }
+ } else {
+ meshlink_node_t *node = meshlink_get_node(mesh, arg);
+ if(!node) {
+ fprintf(stderr, "Error looking up '%s': %s\n", arg, meshlink_strerror(meshlink_errno));
+ } 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_handle_t *mesh, char *buf) {
+ static meshlink_node_t *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 = meshlink_get_node(mesh, buf);
+ if(!destination) {
+ fprintf(stderr, "Error looking up '%s': %s\n", buf, meshlink_strerror(meshlink_errno));
+ return;
+ }
+ }
+
+ if(!destination) {
+ fprintf(stderr, "Who are you talking to? Write 'name: message...'\n");
+ return;
+ }
+
+ // We want to have one channel per node.
+ // We keep the pointer to the meshlink_channel_t in the priv field of that node.
+ meshlink_channel_t *channel = destination->priv;
+
+ if(!channel) {
+ fprintf(stderr, "Opening chat channel to '%s'\n", destination->name);
+ channel = meshlink_channel_open(mesh, destination, CHAT_PORT, channel_receive, NULL, 0);
+ if(!channel) {
+ fprintf(stderr, "Could not create channel to '%s': %s\n", destination->name, meshlink_strerror(meshlink_errno));
+ return;
+ }
+ destination->priv = channel;
+ }
+
+ if(!meshlink_channel_send(mesh, channel, msg, len + 1)) {
+ fprintf(stderr, "Could not send message to '%s': %s\n", destination->name, meshlink_strerror(meshlink_errno));
+ 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_set_log_cb(NULL, MESHLINK_DEBUG, log_message);
+
+ meshlink_handle_t *mesh = meshlink_open(confbase, nick, "chat", DEV_CLASS_STATIONARY);
+ if(!mesh) {
+ fprintf(stderr, "Could not open MeshLink: %s\n", meshlink_strerror(meshlink_errno));
+ return 1;
+ }
+
+ meshlink_set_node_status_cb(mesh, node_status);
+ meshlink_set_log_cb(mesh, MESHLINK_INFO, log_message);
+
+ // Set the channel accept callback. This implicitly turns on channels for all nodes.
+ // This replaces the call to meshlink_set_receive_cb().
+ meshlink_set_channel_accept_cb(mesh, channel_accept);
+
+ if(!meshlink_start(mesh)) {
+ fprintf(stderr, "Could not start MeshLink: %s\n", meshlink_strerror(meshlink_errno));
+ 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");
+
+ meshlink_stop(mesh);
+ meshlink_close(mesh);
+
+ return 0;
+}
#ifndef MESHLINK_INTERNAL_H
struct meshlink_handle {
- char *name;
- void *priv;
+ char *name; ///< Textual name of ourself. It is stored in a nul-terminated C string, which is allocated by MeshLink.
+ void *priv; ///< Private pointer which may be set freely by the application, and is never used or modified by MeshLink.
};
struct meshlink_node {
};
struct meshlink_channel {
+ struct meshlink_node *node; ///< Pointer to the peer of this channel.
+ void *priv; ///< Private pointer which may be set freely by the application, and is never used or modified by MeshLink.
};
#endif // MESHLINK_INTERNAL_H
* @param level An enum describing the severity level of the message.
* @param text A pointer to a nul-terminated C string containing the textual log message.
* This pointer is only valid for the duration of the callback.
+ * H
* The application must not free() this pointer.
* The application should strdup() the text if it has to be available outside the callback.
*/
* If the application rejects the incoming channel by returning false,
* then this handle is invalid after the callback returns
* (the callback does not need to call meshlink_channel_close() itself in this case).
- * @param node The node from which this channel is being initiated.
- * The pointer is guaranteed to be valid until meshlink_close() is called.
* @param port The port number the peer wishes to connect to.
* @param data A pointer to a buffer containing data already received, or NULL in case no data has been received yet. (Not yet used.)
* The pointer is only valid during the lifetime of the callback.
* @return This function should return true if the application accepts the incoming channel, false otherwise.
* If returning false, the channel is invalid and may not be used anymore.
*/
-typedef bool (*meshlink_channel_accept_cb_t)(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_node_t *node, uint16_t port, const void *data, size_t len);
+typedef bool (*meshlink_channel_accept_cb_t)(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint16_t port, const void *data, size_t len);
/// A callback for receiving data from a channel.
/** This function is called whenever data is received from a remote node on a channel.
projects / meshlink / commitdiff