git.meshlink.io Git - meshlink/blob - examples/chatpp.cc

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <strings.h>
   5 #include "../src/meshlink++.h"
   6
   7 static void log_message(meshlink::mesh *mesh, meshlink::log_level_t level, const char *text) {
   8         const char *levelstr[] = {"DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"};
   9         fprintf(stderr, "%s: %s\n", levelstr[level], text);
  10 }
  11
  12 static void receive(meshlink::mesh *mesh, meshlink::node *source, const void *data, size_t len) {
  13         const char *msg = (const char *)data;
  14
  15         if(!len || msg[len - 1]) {
  16                 fprintf(stderr, "Received invalid data from %s\n", source->name);
  17                 return;
  18         }
  19
  20         printf("%s says: %s\n", source->name, msg);
  21 }
  22
  23 static void node_status(meshlink::mesh *mesh, meshlink::node *node, bool reachable) {
  24         if(reachable)
  25                 printf("%s joined.\n", node->name);
  26         else
  27                 printf("%s left.\n", node->name);
  28 }
  29
  30 static void parse_command(meshlink::mesh *mesh, char *buf) {
  31         char *arg = strchr(buf, ' ');
  32         if(arg)
  33                 *arg++ = 0;
  34
  35         if(!strcasecmp(buf, "invite")) {
  36                 char *invitation;
  37
  38                 if(!arg) {
  39                         fprintf(stderr, "/invite requires an argument!\n");
  40                         return;
  41                 }
  42
  43                 invitation = mesh->invite(arg);
  44                 if(!invitation) {
  45                         fprintf(stderr, "Could not invite '%s': %s\n", arg, mesh->errstr);
  46                         return;
  47                 }
  48
  49                 printf("Invitation for %s: %s\n", arg, invitation);
  50                 free(invitation);
  51         } else if(!strcasecmp(buf, "join")) {
  52                 if(!arg) {
  53                         fprintf(stderr, "/join requires an argument!\n");
  54                         return;
  55                 }
  56
  57                 if(!mesh->join(arg))
  58                         fprintf(stderr, "Could not join using invitation: %s\n", mesh->errstr);
  59                 else
  60                         fprintf(stderr, "Invitation accepted!\n");
  61         } else if(!strcasecmp(buf, "kick")) {
  62                 if(!arg) {
  63                         fprintf(stderr, "/kick requires an argument!\n");
  64                         return;
  65                 }
  66
  67                 meshlink::node *node = mesh->get_node(arg);
  68                 if(!node) {
  69                         fprintf(stderr, "Unknown node '%s'\n", arg);
  70                         return;
  71                 }
  72
  73                 mesh->blacklist(node);
  74
  75                 printf("Node '%s' blacklisted.\n", arg);
  76         } else if(!strcasecmp(buf, "who")) {
  77                 if(!arg) {
  78                         meshlink::node *nodes[100];
  79                         size_t n = mesh->get_all_nodes(nodes, 100);
  80                         if(!n) {
  81                                 fprintf(stderr, "No nodes known!\n");
  82                         } else {
  83                                 printf("Known nodes:");
  84                                 for(int i = 0; i < n && i < 100; i++)
  85                                         printf(" %s", nodes[i]->name);
  86                                 if(n > 100)
  87                                         printf(" (and %zu more)", n - 100);
  88                                 printf("\n");
  89                         }
  90                 } else {
  91                         meshlink::node *node = mesh->get_node(arg);
  92                         if(!node) {
  93                                 fprintf(stderr, "Unknown node '%s'\n", arg);
  94                         } else {
  95                                 printf("Node %s found\n", arg);
  96                         }
  97                 }
  98         } else if(!strcasecmp(buf, "quit")) {
  99                 printf("Bye!\n");
 100                 fclose(stdin);
 101         } else if(!strcasecmp(buf, "help")) {
 102                 printf(
 103                         "<name>: <message>     Send a message to the given node.\n"
 104                         "                      Subsequent messages don't need the <name>: prefix.\n"
 105                         "/invite <name>        Create an invitation for a new node.\n"
 106                         "/join <invitation>    Join an existing mesh using an invitation.\n"
 107                         "/kick <name>          Blacklist the given node.\n"
 108                         "/who [<name>]         List all nodes or show information about the given node.\n"
 109                         "/quit                 Exit this program.\n"
 110                         );
 111         } else {
 112                 fprintf(stderr, "Unknown command '/%s'\n", buf);
 113         }
 114 }
 115
 116 static void parse_input(meshlink::mesh *mesh, char *buf) {
 117         static meshlink::node *destination;
 118         size_t len;
 119
 120         if(!buf)
 121                 return;
 122
 123         // Remove newline.
 124
 125         len = strlen(buf);
 126
 127         if(len && buf[len - 1] == '\n')
 128                 buf[--len] = 0;
 129
 130         if(len && buf[len - 1] == '\r')
 131                 buf[--len] = 0;
 132
 133         // Ignore empty lines.
 134
 135         if(!len)
 136                 return;
 137
 138         // Commands start with '/'
 139
 140         if(*buf == '/')
 141                 return parse_command(mesh, buf + 1);
 142
 143         // Lines in the form "name: message..." set the destination node.
 144
 145         char *msg = buf;
 146         char *colon = strchr(buf, ':');
 147
 148         if(colon) {
 149                 *colon = 0;
 150                 msg = colon + 1;
 151                 if(*msg == ' ')
 152                         msg++;
 153
 154                 destination = mesh->get_node(buf);
 155                 if(!destination) {
 156                         fprintf(stderr, "Unknown node '%s'\n", buf);
 157                         return;
 158                 }
 159         }
 160
 161         if(!destination) {
 162                 fprintf(stderr, "Who are you talking to? Write 'name: message...'\n");
 163                 return;
 164         }
 165
 166         if(!mesh->send(destination, msg, strlen(msg) + 1)) {
 167                 fprintf(stderr, "Could not send message to '%s': %s\n", destination->name, mesh->errstr);
 168                 return;
 169         }
 170
 171         printf("Message sent to '%s'.\n", destination->name);
 172 }
 173
 174 int main(int argc, char *argv[]) {
 175         const char *confbase = ".chat";
 176         const char *nick = NULL;
 177         char buf[1024];
 178
 179         if(argc > 1)
 180                 confbase = argv[1];
 181
 182         if(argc > 2)
 183                 nick = argv[2];
 184
 185         meshlink::mesh *mesh = meshlink::open(confbase, nick);
 186         if(!mesh) {
 187                 fprintf(stderr, "Could not open MeshLink!\n");
 188                 return 1;
 189         }
 190
 191         mesh->set_receive_cb(receive);
 192         mesh->set_node_status_cb(node_status);
 193         mesh->set_log_cb(MESHLINK_INFO, log_message);
 194
 195         if(!mesh->start()) {
 196                 fprintf(stderr, "Could not start MeshLink: %s\n", mesh->errstr);
 197                 return 1;
 198         }
 199
 200         printf("Chat started.\nType /help for a list of commands.\n");
 201
 202         while(fgets(buf, sizeof buf, stdin))
 203                 parse_input(mesh, buf);
 204
 205         printf("Chat stopping.\n");
 206
 207         mesh->stop();
 208         meshlink::close(mesh);
 209
 210         return 0;
 211 }