apps/silcd/server.h

   1 /*
   2
   3   server.h
   4
   5   Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
   6
   7   Copyright (C) 1997 - 2001 Pekka Riikonen
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; either version 2 of the License, or
  12   (at your option) any later version.
  13
  14   This program is distributed in the hope that it will be useful,
  15   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17   GNU General Public License for more details.
  18
  19 */
  20
  21 #ifndef SERVER_H
  22 #define SERVER_H
  23
  24 /* Forward declaration for SILC Server object. The actual object is
  25    defined in internal header file for server routines. I want to keep
  26    the object private hence this declaration. */
  27 typedef struct SilcServerStruct *SilcServer;
  28
  29 /* Forward declaration of backup server context */
  30 typedef struct SilcServerBackupStruct *SilcServerBackup;
  31
  32 #define SILC_SERVER_MAX_CONNECTIONS 1000
  33
  34 /* General definitions */
  35
  36 /* SILC port */
  37 #define SILC_PORT 768;
  38
  39 /* Server and router. Used internally by the code. */
  40 #define SILC_SERVER 0
  41 #define SILC_ROUTER 1
  42 #define SILC_BACKUP_ROUTER 2
  43
  44 /* Connection retry timeout. We implement exponential backoff algorithm
  45    in connection retry. The interval of timeuot grows when retry count
  46    grows. */
  47 #define SILC_SERVER_RETRY_COUNT        4         /* Max retry count */
  48 #define SILC_SERVER_RETRY_MULTIPLIER   7 / 4     /* Interval growth */
  49 #define SILC_SERVER_RETRY_RANDOMIZER   2         /* timeout += rnd % 2 */
  50 #define SILC_SERVER_RETRY_INTERVAL_MIN 10        /* Min retry timeout */
  51 #define SILC_SERVER_RETRY_INTERVAL_MAX 600       /* Max generated timeout */
  52
  53 /*
  54    Silc Server Params.
  55
  56    Structure to hold various default parameters for server that can be
  57    given before running the server.
  58
  59 */
  60 typedef struct {
  61   uint32 retry_count;
  62   uint32 retry_interval_min;
  63   uint32 retry_interval_min_usec;
  64   uint32 retry_interval_max;
  65   char retry_keep_trying;
  66
  67   uint32 protocol_timeout;
  68   uint32 protocol_timeout_usec;
  69
  70   char require_reverse_mapping;
  71 } *SilcServerParams;
  72
  73 /* Callback function that is called after the key exchange and connection
  74    authentication protocols has been completed with a remote router. The
  75    `server_entry' is the remote router entry. */
  76 typedef void (*SilcServerConnectRouterCallback)(SilcServer server,
  77                                                 SilcServerEntry server_entry,
  78                                                 void *context);
  79
  80 typedef struct {
  81   SilcSocketConnection sock;
  82
  83   /* Remote host name and port */
  84   char *remote_host;
  85   int remote_port;
  86   bool backup;
  87   char *backup_replace_ip;
  88   int backup_replace_port;
  89
  90   /* Current connection retry info */
  91   uint32 retry_count;
  92   uint32 retry_timeout;
  93
  94   /* Back pointer to server */
  95   SilcServer server;
  96
  97   SilcServerConnectRouterCallback callback;
  98   void *callback_context;
  99 } *SilcServerConnection;
 100
 101 /* Macros */
 102
 103 /* This macro is used to send notify messages with formatted string. The
 104    string is formatted with arguments and the formatted string is sent as
 105    argument. */
 106 #define SILC_SERVER_SEND_NOTIFY(server, sock, type, fmt)        \
 107 do {                                                            \
 108   char *__fmt__ = silc_format fmt;                              \
 109   silc_server_send_notify(server, sock, FALSE,                  \
 110                           type, 1, __fmt__, strlen(__fmt__));   \
 111   silc_free(__fmt__);                                           \
 112 } while(0);
 113
 114 /* Check whether rekey protocol is active */
 115 #define SILC_SERVER_IS_REKEY(sock)                                      \
 116   (sock->protocol && sock->protocol->protocol &&                        \
 117    sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)
 118
 119 /* Prototypes */
 120 int silc_server_alloc(SilcServer *new_server);
 121 void silc_server_free(SilcServer server);
 122 int silc_server_init(SilcServer server);
 123 void silc_server_daemonise(SilcServer server);
 124 void silc_server_drop(SilcServer server);
 125 void silc_server_run(SilcServer server);
 126 void silc_server_stop(SilcServer server);
 127 void silc_server_start_key_exchange(SilcServer server,
 128                                     SilcServerConnection sconn,
 129                                     int sock);
 130 bool silc_server_packet_parse(SilcPacketParserContext *parser_context,
 131                               void *context);
 132 void silc_server_packet_parse_type(SilcServer server,
 133                                    SilcSocketConnection sock,
 134                                    SilcPacketContext *packet);
 135 void silc_server_create_connection(SilcServer server,
 136                                    char *remote_host, uint32 port);
 137 void silc_server_close_connection(SilcServer server,
 138                                   SilcSocketConnection sock);
 139 void silc_server_free_client_data(SilcServer server,
 140                                   SilcSocketConnection sock,
 141                                   SilcClientEntry client,
 142                                   int notify,
 143                                   char *signoff);
 144 void silc_server_free_sock_user_data(SilcServer server,
 145                                      SilcSocketConnection sock);
 146 void silc_server_remove_from_channels(SilcServer server,
 147                                       SilcSocketConnection sock,
 148                                       SilcClientEntry client,
 149                                       int notify,
 150                                       char *signoff_message,
 151                                       int keygen);
 152 int silc_server_remove_from_one_channel(SilcServer server,
 153                                         SilcSocketConnection sock,
 154                                         SilcChannelEntry channel,
 155                                         SilcClientEntry client,
 156                                         int notify);
 157 void silc_server_disconnect_remote(SilcServer server,
 158                                    SilcSocketConnection sock,
 159                                    const char *fmt, ...);
 160 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
 161                                                 SilcServerID *router_id,
 162                                                 char *cipher,
 163                                                 char *hmac,
 164                                                 char *channel_name,
 165                                                 int broadcast);
 166 SilcChannelEntry
 167 silc_server_create_new_channel_with_id(SilcServer server,
 168                                        char *cipher,
 169                                        char *hmac,
 170                                        char *channel_name,
 171                                        SilcChannelID *channel_id,
 172                                        int broadcast);
 173 bool silc_server_create_channel_key(SilcServer server,
 174                                     SilcChannelEntry channel,
 175                                     uint32 key_len);
 176 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
 177                                               SilcBuffer key_payload,
 178                                               SilcChannelEntry channel);
 179 void silc_server_perform_heartbeat(SilcSocketConnection sock,
 180                                    void *hb_context);
 181 void silc_server_announce_get_channel_topic(SilcServer server,
 182                                             SilcChannelEntry channel,
 183                                             SilcBuffer *topic);
 184 void silc_server_announce_get_channel_users(SilcServer server,
 185                                             SilcChannelEntry channel,
 186                                             SilcBuffer *channel_users,
 187                                             SilcBuffer *channel_users_modes);
 188 void silc_server_announce_get_channels(SilcServer server,
 189                                        SilcIDList id_list,
 190                                        SilcBuffer *channels,
 191                                        SilcBuffer *channel_users,
 192                                        SilcBuffer **channel_users_modes,
 193                                        uint32 *channel_users_modes_c,
 194                                        SilcBuffer **channel_topics,
 195                                        SilcChannelID ***channel_ids,
 196                                        unsigned long creation_time);
 197 void silc_server_announce_servers(SilcServer server, bool global,
 198                                   unsigned long creation_time,
 199                                   SilcSocketConnection remote);
 200 void silc_server_announce_clients(SilcServer server,
 201                                   unsigned long creation_time,
 202                                   SilcSocketConnection remote);
 203 void silc_server_announce_channels(SilcServer server,
 204                                    unsigned long creation_time,
 205                                    SilcSocketConnection remote);
 206 void silc_server_get_users_on_channel(SilcServer server,
 207                                       SilcChannelEntry channel,
 208                                       SilcBuffer *user_list,
 209                                       SilcBuffer *mode_list,
 210                                       uint32 *user_count);
 211 void silc_server_save_users_on_channel(SilcServer server,
 212                                        SilcSocketConnection sock,
 213                                        SilcChannelEntry channel,
 214                                        SilcClientID *noadd,
 215                                        SilcBuffer user_list,
 216                                        SilcBuffer mode_list,
 217                                        uint32 user_count);
 218 SilcSocketConnection silc_server_get_client_route(SilcServer server,
 219                                                   unsigned char *id_data,
 220                                                   uint32 id_len,
 221                                                   SilcClientID *client_id,
 222                                                   SilcIDListData *idata);
 223 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
 224                                                SilcClientEntry client);
 225 SilcClientEntry silc_server_get_client_resolve(SilcServer server,
 226                                                SilcClientID *client_id);
 227
 228 #endif