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) {
21 const char *msg = data;
25 fprintf(stderr, "Error while reading data from %s: %s\n", channel->node->name, meshlink_strerror(meshlink_errno));
27 fprintf(stderr, "Chat connection closed by %s\n", channel->node->name);
29 channel->node->priv = NULL;
30 meshlink_channel_close(mesh, channel);
34 // TODO: we now have TCP semantics, don't expect exactly one message per receive call.
36 fprintf(stderr, "Received invalid data from %s\n", channel->node->name);
40 printf("%s says: %s\n", channel->node->name, msg);
43 static bool channel_accept(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint16_t port, const void *data, size_t len) {
44 // Only accept connections to the chat port
45 if(port != CHAT_PORT) {
46 fprintf(stderr, "Rejected incoming channel from '%s' to port %u\n", channel->node->name, port);
50 fprintf(stderr, "Accepted incoming channel from '%s'\n", channel->node->name);
52 // Remember the channel
53 channel->node->priv = channel;
55 // Set the receive callback
56 meshlink_set_channel_receive_cb(mesh, channel, channel_receive);
58 // Accept this channel
62 static void node_status(meshlink_handle_t *mesh, meshlink_node_t *node, bool reachable) {
64 printf("%s joined.\n", node->name);
66 printf("%s left.\n", node->name);
69 static meshlink_node_t **nodes;
72 static void parse_command(meshlink_handle_t *mesh, char *buf) {
73 char *arg = strchr(buf, ' ');
77 if(!strcasecmp(buf, "invite")) {
81 fprintf(stderr, "/invite requires an argument!\n");
85 invitation = meshlink_invite(mesh, arg);
87 fprintf(stderr, "Could not invite '%s': %s\n", arg, meshlink_strerror(meshlink_errno));
91 printf("Invitation for %s: %s\n", arg, invitation);
93 } else if(!strcasecmp(buf, "join")) {
95 fprintf(stderr, "/join requires an argument!\n");
99 if(!meshlink_join(mesh, arg))
100 fprintf(stderr, "Could not join using invitation: %s\n", meshlink_strerror(meshlink_errno));
102 fprintf(stderr, "Invitation accepted!\n");
103 if(!meshlink_start(mesh)) {
104 fprintf(stderr, "Could not start MeshLink: %s\n", meshlink_strerror(meshlink_errno));
108 } else if(!strcasecmp(buf, "kick")) {
110 fprintf(stderr, "/kick requires an argument!\n");
114 meshlink_node_t *node = meshlink_get_node(mesh, arg);
116 fprintf(stderr, "Error looking up '%s': %s\n", arg, meshlink_strerror(meshlink_errno));
120 meshlink_blacklist(mesh, node);
122 printf("Node '%s' blacklisted.\n", arg);
123 } else if(!strcasecmp(buf, "who")) {
125 nodes = meshlink_get_all_nodes(mesh, nodes, &nnodes);
127 fprintf(stderr, "Could not get list of nodes: %s\n", meshlink_strerror(meshlink_errno));
129 printf("%zu known nodes:", nnodes);
130 for(int i = 0; i < nnodes; i++)
131 printf(" %s", nodes[i]->name);
135 meshlink_node_t *node = meshlink_get_node(mesh, arg);
137 fprintf(stderr, "Error looking up '%s': %s\n", arg, meshlink_strerror(meshlink_errno));
139 printf("Node %s found\n", arg);
142 } else if(!strcasecmp(buf, "quit")) {
145 } else if(!strcasecmp(buf, "help")) {
147 "<name>: <message> Send a message to the given node.\n"
148 " Subsequent messages don't need the <name>: prefix.\n"
149 "/invite <name> Create an invitation for a new node.\n"
150 "/join <invitation> Join an existing mesh using an invitation.\n"
151 "/kick <name> Blacklist the given node.\n"
152 "/who [<name>] List all nodes or show information about the given node.\n"
153 "/quit Exit this program.\n"
156 fprintf(stderr, "Unknown command '/%s'\n", buf);
160 static void parse_input(meshlink_handle_t *mesh, char *buf) {
161 static meshlink_node_t *destination;
171 if(len && buf[len - 1] == '\n')
174 if(len && buf[len - 1] == '\r')
177 // Ignore empty lines.
182 // Commands start with '/'
185 return parse_command(mesh, buf + 1);
187 // Lines in the form "name: message..." set the destination node.
190 char *colon = strchr(buf, ':');
198 destination = meshlink_get_node(mesh, buf);
200 fprintf(stderr, "Error looking up '%s': %s\n", buf, meshlink_strerror(meshlink_errno));
206 fprintf(stderr, "Who are you talking to? Write 'name: message...'\n");
210 // We want to have one channel per node.
211 // We keep the pointer to the meshlink_channel_t in the priv field of that node.
212 meshlink_channel_t *channel = destination->priv;
215 fprintf(stderr, "Opening chat channel to '%s'\n", destination->name);
216 channel = meshlink_channel_open(mesh, destination, CHAT_PORT, channel_receive, NULL, 0);
218 fprintf(stderr, "Could not create channel to '%s': %s\n", destination->name, meshlink_strerror(meshlink_errno));
221 destination->priv = channel;
224 if(!meshlink_channel_send(mesh, channel, msg, len + 1)) {
225 fprintf(stderr, "Could not send message to '%s': %s\n", destination->name, meshlink_strerror(meshlink_errno));
229 printf("Message sent to '%s'.\n", destination->name);
232 int main(int argc, char *argv[]) {
233 const char *confbase = ".chat";
234 const char *nick = NULL;
243 meshlink_set_log_cb(NULL, MESHLINK_DEBUG, log_message);
245 meshlink_handle_t *mesh = meshlink_open(confbase, nick, "chat", DEV_CLASS_STATIONARY);
247 fprintf(stderr, "Could not open MeshLink: %s\n", meshlink_strerror(meshlink_errno));
251 meshlink_set_node_status_cb(mesh, node_status);
252 meshlink_set_log_cb(mesh, MESHLINK_INFO, log_message);
254 // Set the channel accept callback. This implicitly turns on channels for all nodes.
255 // This replaces the call to meshlink_set_receive_cb().
256 meshlink_set_channel_accept_cb(mesh, channel_accept);
258 if(!meshlink_start(mesh)) {
259 fprintf(stderr, "Could not start MeshLink: %s\n", meshlink_strerror(meshlink_errno));
263 printf("Chat started.\nType /help for a list of commands.\n");
265 while(fgets(buf, sizeof buf, stdin))
266 parse_input(mesh, buf);
268 printf("Chat stopping.\n");
271 meshlink_close(mesh);