5 #include "../src/meshlink.h"
9 static void log_message(meshlink_handle_t *mesh, meshlink_log_level_t level, const char *text) {
10 const char *levelstr[] = {
11 [MESHLINK_DEBUG] = "\x1b[34mDEBUG",
12 [MESHLINK_INFO] = "\x1b[32mINFO",
13 [MESHLINK_WARNING] = "\x1b[33mWARNING",
14 [MESHLINK_ERROR] = "\x1b[31mERROR",
15 [MESHLINK_CRITICAL] = "\x1b[31mCRITICAL",
17 fprintf(stderr, "%s:\x1b[0m %s\n", levelstr[level], text);
20 static void channel_receive(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
23 fprintf(stderr, "Error while reading data from %s: %s\n", channel->node->name, meshlink_strerror(meshlink_errno));
25 fprintf(stderr, "Chat connection closed by %s\n", channel->node->name);
28 channel->node->priv = NULL;
29 meshlink_channel_close(mesh, channel);
33 // TODO: we now have TCP semantics, don't expect exactly one message per receive call.
35 printf("%s says: ", channel->node->name);
36 fwrite(data, len, 1, stdout);
40 static bool channel_accept(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint16_t port, const void *data, size_t len) {
41 // Only accept connections to the chat port
42 if(port != CHAT_PORT) {
43 fprintf(stderr, "Rejected incoming channel from '%s' to port %u\n", channel->node->name, port);
47 fprintf(stderr, "Accepted incoming channel from '%s'\n", channel->node->name);
49 // Remember the channel
50 channel->node->priv = channel;
52 // Set the receive callback
53 meshlink_set_channel_receive_cb(mesh, channel, channel_receive);
55 // Accept this channel
59 static void channel_poll(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t len) {
60 fprintf(stderr, "Channel to '%s' connected\n", channel->node->name);
61 meshlink_set_channel_poll_cb(mesh, channel, NULL);
64 static void node_status(meshlink_handle_t *mesh, meshlink_node_t *node, bool reachable) {
66 printf("%s joined.\n", node->name);
68 printf("%s left.\n", node->name);
72 static meshlink_node_t **nodes;
75 static void parse_command(meshlink_handle_t *mesh, char *buf) {
76 char *arg = strchr(buf, ' ');
82 if(!strcasecmp(buf, "invite")) {
86 fprintf(stderr, "/invite requires an argument!\n");
90 invitation = meshlink_invite(mesh, arg);
93 fprintf(stderr, "Could not invite '%s': %s\n", arg, meshlink_strerror(meshlink_errno));
97 printf("Invitation for %s: %s\n", arg, invitation);
99 } else if(!strcasecmp(buf, "join")) {
101 fprintf(stderr, "/join requires an argument!\n");
107 if(!meshlink_join(mesh, arg)) {
108 fprintf(stderr, "Could not join using invitation: %s\n", meshlink_strerror(meshlink_errno));
110 fprintf(stderr, "Invitation accepted!\n");
113 if(!meshlink_start(mesh)) {
114 fprintf(stderr, "Could not restart MeshLink: %s\n", meshlink_strerror(meshlink_errno));
117 } else if(!strcasecmp(buf, "kick")) {
119 fprintf(stderr, "/kick requires an argument!\n");
123 meshlink_node_t *node = meshlink_get_node(mesh, arg);
126 fprintf(stderr, "Error looking up '%s': %s\n", arg, meshlink_strerror(meshlink_errno));
130 meshlink_blacklist(mesh, node);
132 printf("Node '%s' blacklisted.\n", arg);
133 } else if(!strcasecmp(buf, "who")) {
135 nodes = meshlink_get_all_nodes(mesh, nodes, &nnodes);
138 fprintf(stderr, "Could not get list of nodes: %s\n", meshlink_strerror(meshlink_errno));
140 printf("%zu known nodes:", nnodes);
142 for(int i = 0; i < nnodes; i++) {
143 printf(" %s", nodes[i]->name);
149 meshlink_node_t *node = meshlink_get_node(mesh, arg);
152 fprintf(stderr, "Error looking up '%s': %s\n", arg, meshlink_strerror(meshlink_errno));
154 printf("Node %s found\n", arg);
157 } else if(!strcasecmp(buf, "quit")) {
160 } else if(!strcasecmp(buf, "help")) {
162 "<name>: <message> Send a message to the given node.\n"
163 " Subsequent messages don't need the <name>: prefix.\n"
164 "/invite <name> Create an invitation for a new node.\n"
165 "/join <invitation> Join an existing mesh using an invitation.\n"
166 "/kick <name> Blacklist the given node.\n"
167 "/who [<name>] List all nodes or show information about the given node.\n"
168 "/quit Exit this program.\n"
171 fprintf(stderr, "Unknown command '/%s'\n", buf);
175 static void parse_input(meshlink_handle_t *mesh, char *buf) {
176 static meshlink_node_t *destination;
187 if(len && buf[len - 1] == '\n') {
191 if(len && buf[len - 1] == '\r') {
195 // Ignore empty lines.
201 // Commands start with '/'
204 return parse_command(mesh, buf + 1);
207 // Lines in the form "name: message..." set the destination node.
210 char *colon = strchr(buf, ':');
220 destination = meshlink_get_node(mesh, buf);
223 fprintf(stderr, "Error looking up '%s': %s\n", buf, meshlink_strerror(meshlink_errno));
229 fprintf(stderr, "Who are you talking to? Write 'name: message...'\n");
233 // We want to have one channel per node.
234 // We keep the pointer to the meshlink_channel_t in the priv field of that node.
235 meshlink_channel_t *channel = destination->priv;
238 fprintf(stderr, "Opening chat channel to '%s'\n", destination->name);
239 channel = meshlink_channel_open(mesh, destination, CHAT_PORT, channel_receive, NULL, 0);
242 fprintf(stderr, "Could not create channel to '%s': %s\n", destination->name, meshlink_strerror(meshlink_errno));
246 destination->priv = channel;
247 meshlink_set_channel_poll_cb(mesh, channel, channel_poll);
250 if(!meshlink_channel_send(mesh, channel, msg, strlen(msg))) {
251 fprintf(stderr, "Could not send message to '%s': %s\n", destination->name, meshlink_strerror(meshlink_errno));
255 printf("Message sent to '%s'.\n", destination->name);
258 int main(int argc, char *argv[]) {
259 const char *confbase = ".chat";
260 const char *nick = NULL;
271 meshlink_set_log_cb(NULL, MESHLINK_DEBUG, log_message);
273 meshlink_handle_t *mesh = meshlink_open(confbase, nick, "chat", DEV_CLASS_STATIONARY);
276 fprintf(stderr, "Could not open MeshLink: %s\n", meshlink_strerror(meshlink_errno));
280 meshlink_set_node_status_cb(mesh, node_status);
281 meshlink_set_log_cb(mesh, MESHLINK_INFO, log_message);
283 // Set the channel accept callback. This implicitly turns on channels for all nodes.
284 // This replaces the call to meshlink_set_receive_cb().
285 meshlink_set_channel_accept_cb(mesh, channel_accept);
287 if(!meshlink_start(mesh)) {
288 fprintf(stderr, "Could not start MeshLink: %s\n", meshlink_strerror(meshlink_errno));
292 printf("Chat started.\nType /help for a list of commands.\n");
294 while(fgets(buf, sizeof(buf), stdin)) {
295 parse_input(mesh, buf);
298 printf("Chat stopping.\n");
301 meshlink_close(mesh);