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