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 class ChatMesh : public meshlink::mesh {
   8 public:
   9         void log(meshlink::log_level_t level, const char *text) {
  10                 const char *levelstr[] = {"DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"};
  11                 fprintf(stderr, "%s: %s\n", levelstr[level], text);
  12         }
  13
  14         void receive(meshlink::node *source, const void *data, size_t len) {
  15                 const char *msg = (const char *)data;
  16
  17                 if(!len || msg[len - 1]) {
  18                         fprintf(stderr, "Received invalid data from %s\n", source->name);
  19                         return;
  20                 }
  21
  22                 printf("%s says: %s\n", source->name, msg);
  23         }
  24
  25         void node_status(meshlink::node *node, bool reachable) {
  26                 if(reachable) {
  27                         printf("%s joined.\n", node->name);
  28                 } else {
  29                         printf("%s left.\n", node->name);
  30                 }
  31         }
  32 };
  33
  34 static meshlink::node **nodes;
  35 static size_t nnodes;
  36
  37 static void parse_command(meshlink::mesh *mesh, char *buf) {
  38         char *arg = strchr(buf, ' ');
  39
  40         if(arg) {
  41                 *arg++ = 0;
  42         }
  43
  44         if(!strcasecmp(buf, "invite")) {
  45                 char *invitation;
  46
  47                 if(!arg) {
  48                         fprintf(stderr, "/invite requires an argument!\n");
  49                         return;
  50                 }
  51
  52                 invitation = mesh->invite(arg);
  53
  54                 if(!invitation) {
  55                         fprintf(stderr, "Could not invite '%s': %s\n", arg, meshlink::strerror());
  56                         return;
  57                 }
  58
  59                 printf("Invitation for %s: %s\n", arg, invitation);
  60                 free(invitation);
  61         } else if(!strcasecmp(buf, "join")) {
  62                 if(!arg) {
  63                         fprintf(stderr, "/join requires an argument!\n");
  64                         return;
  65                 }
  66
  67                 mesh->stop();
  68
  69                 if(!mesh->join(arg)) {
  70                         fprintf(stderr, "Could not join using invitation: %s\n", meshlink::strerror());
  71                 } else {
  72                         fprintf(stderr, "Invitation accepted!\n");
  73                 }
  74
  75                 if(!mesh->start()) {
  76                         fprintf(stderr, "Could not restart MeshLink: %s\n", meshlink::strerror());
  77                         exit(1);
  78                 }
  79         } else if(!strcasecmp(buf, "kick")) {
  80                 if(!arg) {
  81                         fprintf(stderr, "/kick requires an argument!\n");
  82                         return;
  83                 }
  84
  85                 meshlink::node *node = mesh->get_node(arg);
  86
  87                 if(!node) {
  88                         fprintf(stderr, "Error looking up '%s': %s\n", arg, meshlink::strerror());
  89                         return;
  90                 }
  91
  92                 mesh->blacklist(node);
  93
  94                 printf("Node '%s' blacklisted.\n", arg);
  95         } else if(!strcasecmp(buf, "who")) {
  96                 if(!arg) {
  97                         nodes = mesh->get_all_nodes(nodes, &nnodes);
  98
  99                         if(!nodes) {
 100                                 fprintf(stderr, "Could not get list of nodes: %s\n", meshlink::strerror());
 101                         } else {
 102                                 printf("%zu known nodes:", nnodes);
 103
 104                                 for(size_t i = 0; i < nnodes; i++) {
 105                                         printf(" %s", nodes[i]->name);
 106                                 }
 107
 108                                 printf("\n");
 109                         }
 110                 } else {
 111                         meshlink::node *node = mesh->get_node(arg);
 112
 113                         if(!node) {
 114                                 fprintf(stderr, "Error looking up '%s': %s\n", arg, meshlink::strerror());
 115                         } else {
 116                                 printf("Node %s found\n", arg);
 117                         }
 118                 }
 119         } else if(!strcasecmp(buf, "quit")) {
 120                 printf("Bye!\n");
 121                 fclose(stdin);
 122         } else if(!strcasecmp(buf, "help")) {
 123                 printf(
 124                         "<name>: <message>     Send a message to the given node.\n"
 125                         "                      Subsequent messages don't need the <name>: prefix.\n"
 126                         "/invite <name>        Create an invitation for a new node.\n"
 127                         "/join <invitation>    Join an existing mesh using an invitation.\n"
 128                         "/kick <name>          Blacklist the given node.\n"
 129                         "/who [<name>]         List all nodes or show information about the given node.\n"
 130                         "/quit                 Exit this program.\n"
 131                 );
 132         } else {
 133                 fprintf(stderr, "Unknown command '/%s'\n", buf);
 134         }
 135 }
 136
 137 static void parse_input(meshlink::mesh *mesh, char *buf) {
 138         static meshlink::node *destination;
 139         size_t len;
 140
 141         if(!buf) {
 142                 return;
 143         }
 144
 145         // Remove newline.
 146
 147         len = strlen(buf);
 148
 149         if(len && buf[len - 1] == '\n') {
 150                 buf[--len] = 0;
 151         }
 152
 153         if(len && buf[len - 1] == '\r') {
 154                 buf[--len] = 0;
 155         }
 156
 157         // Ignore empty lines.
 158
 159         if(!len) {
 160                 return;
 161         }
 162
 163         // Commands start with '/'
 164
 165         if(*buf == '/') {
 166                 return parse_command(mesh, buf + 1);
 167         }
 168
 169         // Lines in the form "name: message..." set the destination node.
 170
 171         char *msg = buf;
 172         char *colon = strchr(buf, ':');
 173
 174         if(colon) {
 175                 *colon = 0;
 176                 msg = colon + 1;
 177
 178                 if(*msg == ' ') {
 179                         msg++;
 180                 }
 181
 182                 destination = mesh->get_node(buf);
 183
 184                 if(!destination) {
 185                         fprintf(stderr, "Error looking up '%s': %s\n", buf, meshlink::strerror());
 186                         return;
 187                 }
 188         }
 189
 190         if(!destination) {
 191                 fprintf(stderr, "Who are you talking to? Write 'name: message...'\n");
 192                 return;
 193         }
 194
 195         if(!mesh->send(destination, msg, strlen(msg) + 1)) {
 196                 fprintf(stderr, "Could not send message to '%s': %s\n", destination->name, meshlink::strerror());
 197                 return;
 198         }
 199
 200         printf("Message sent to '%s'.\n", destination->name);
 201 }
 202
 203
 204 int main(int argc, char *argv[]) {
 205         const char *confbase = ".chat";
 206         const char *nick = NULL;
 207         char buf[1024];
 208
 209         if(argc > 1) {
 210                 confbase = argv[1];
 211         }
 212
 213         if(argc > 2) {
 214                 nick = argv[2];
 215         }
 216
 217         ChatMesh mesh;
 218         mesh.open(confbase, nick, "chatpp", DEV_CLASS_STATIONARY);
 219
 220         if(!mesh.isOpen()) {
 221                 fprintf(stderr, "Could not open MeshLink: %s\n", meshlink::strerror());
 222                 return 1;
 223         }
 224
 225         if(!mesh.start()) {
 226                 fprintf(stderr, "Could not start MeshLink: %s\n", meshlink::strerror());
 227                 return 1;
 228         }
 229
 230         printf("Chat started.\nType /help for a list of commands.\n");
 231
 232         while(fgets(buf, sizeof(buf), stdin)) {
 233                 parse_input(&mesh, buf);
 234         }
 235
 236         printf("Chat stopping.\n");
 237
 238         mesh.stop();
 239         mesh.close();
 240
 241         return 0;
 242 }