appbridge.cpp

   1 /*****************************************************************************\
   2 **                                                                           **
   3 ** Linux Call Router                                                         **
   4 **                                                                           **
   5 **---------------------------------------------------------------------------**
   6 ** Copyright: Andreas Eversberg                                              **
   7 **                                                                           **
   8 ** The EndpointAppBridge implements direct bridge between interfaces         **
   9 **                                                                           **
  10 \*****************************************************************************/
  11
  12
  13 #include "main.h"
  14
  15 class EndpointAppBridge *appbridge_first = NULL;
  16
  17 /*
  18  * EndpointAppBridge constructor
  19  */
  20 EndpointAppBridge::EndpointAppBridge(class Endpoint *epoint, int origin) : EndpointApp(epoint, origin, EAPP_TYPE_BRIDGE)
  21 {
  22         class EndpointAppBridge **apppointer;
  23
  24         /* add application to chain */
  25         next = NULL;
  26         apppointer = &appbridge_first;
  27         while(*apppointer)
  28                 apppointer = &((*apppointer)->next);
  29         *apppointer = this;
  30
  31         PDEBUG(DEBUG_EPOINT, "Bridge endpoint created\n");
  32 }
  33
  34 /*
  35  * EpointAppBridge destructor
  36  */
  37 EndpointAppBridge::~EndpointAppBridge(void)
  38 {
  39         class EndpointAppBridge *temp, **tempp;
  40
  41         /* detach */
  42         temp =appbridge_first;
  43         tempp = &appbridge_first;
  44         while(temp) {
  45                 if (temp == this)
  46                         break;
  47
  48                 tempp = &temp->next;
  49                 temp = temp->next;
  50         }
  51         if (temp == 0)
  52                 FATAL("Endpoint not in endpoint's list.\n");
  53         *tempp = next;
  54
  55         PDEBUG(DEBUG_EPOINT, "Bridge endpoint destroyed\n");
  56 }
  57
  58
  59 /*
  60  * trace header for application
  61  */
  62 void EndpointAppBridge::trace_header(const char *name, int direction)
  63 {
  64         struct trace _trace;
  65
  66         char msgtext[sizeof(_trace.name)];
  67
  68         SCPY(msgtext, name);
  69
  70         /* init trace with given values */
  71         start_trace(-1,
  72                     NULL,
  73                     "", //numberrize_callerinfo(e_callerinfo.id, e_callerinfo.ntype, options.national, options.international),
  74                     "", // e_dialinginfo.id,
  75                     direction,
  76                     CATEGORY_EP,
  77                     ea_endpoint->ep_serial,
  78                     msgtext);
  79 }
  80
  81 /* port MESSAGE_SETUP */
  82 void EndpointAppBridge::port_setup(struct port_list *portlist, int message_type, union parameter *param)
  83 {
  84         struct interface *interface_in = interface_first;
  85         struct interface *interface_out = interface_first;
  86         struct port_settings    port_settings;
  87         class Port              *port = NULL;
  88         struct lcr_msg *message;
  89         unsigned int bridge_id;
  90         unsigned int source_port_id = portlist->port_id;
  91         char portname[64];
  92         int cause = 47;
  93
  94         PDEBUG(DEBUG_EPOINT, "EPOINT(%d) epoint received setup from='%s' to='%s'\n", ea_endpoint->ep_serial, param->setup.callerinfo.id, param->setup.dialinginfo.id);
  95
  96         if (!ea_endpoint->ep_portlist) {
  97                 PERROR("Endpoint has no port in portlist\n");
  98                 return;
  99         }
 100         if (ea_endpoint->ep_portlist->next) {
 101                 PDEBUG(DEBUG_EPOINT, "Endpoint already received setup, ignoring.\n");
 102                 return;
 103         }
 104
 105         while (interface_in) {
 106                 if (!strcmp(interface_in->name, param->setup.callerinfo.interface))
 107                         break;
 108                 interface_in = interface_in->next;
 109         }
 110         if (!interface_in) {
 111                 PERROR("Cannot find source interface %s.\n", param->setup.callerinfo.interface);
 112 fail:
 113                 message = message_create(ea_endpoint->ep_serial, portlist->port_id, EPOINT_TO_PORT, MESSAGE_RELEASE);
 114                 message->param.disconnectinfo.cause = cause;
 115                 message->param.disconnectinfo.location = LOCATION_PRIVATE_LOCAL;
 116                 message_put(message);
 117                 ea_endpoint->free_portlist(portlist);
 118
 119                 /* destroy endpoint */
 120                 ea_endpoint->ep_use = 0;
 121                 trigger_work(&ea_endpoint->ep_delete);
 122                 return;
 123         }
 124
 125         while (interface_out) {
 126                 if (!strcmp(interface_out->name, interface_in->bridge_if))
 127                         break;
 128                 interface_out = interface_out->next;
 129         }
 130         if (!interface_out) {
 131                 PERROR("Cannot find destination interface %s.\n", interface_in->bridge_if);
 132                 goto fail;
 133                 return;
 134         }
 135
 136         /* create port for interface */
 137         SPRINT(portname, "%s-%d-out", interface_out->name, 0);
 138         memset(&port_settings, 0, sizeof(port_settings));
 139         if (interface_out->remote) {
 140                 struct admin_list       *admin;
 141                 admin = admin_first;
 142                 while(admin) {
 143                         if (admin->remote_name[0] && !strcmp(admin->remote_name, interface_out->remote_app))
 144                                 break;
 145                         admin = admin->next;
 146                 }
 147                 if (!admin) {
 148                         trace_header("INTERFACE (remote not connected)", DIRECTION_NONE);
 149                         add_trace("application", NULL, "%s", interface_out->remote_app);
 150                         end_trace();
 151                         goto fail;
 152                 }
 153                 port = new Premote(PORT_TYPE_REMOTE_OUT, portname, &port_settings, interface_out, admin->sock);
 154         } else
 155 #ifdef WITH_SIP
 156         if (interface_out->sip) {
 157                 port = new Psip(PORT_TYPE_SIP_OUT, portname, &port_settings, interface_out);
 158         } else
 159 #endif
 160 #ifdef WITH_GSM_BS
 161         if (interface_out->gsm_bs) {
 162                 port = new Pgsm_bs(PORT_TYPE_GSM_BS_OUT, portname, &port_settings, interface_out);
 163         } else
 164 #endif
 165 #ifdef WITH_GSM_MS
 166         if (interface_out->gsm_ms) {
 167                 port = new Pgsm_ms(PORT_TYPE_GSM_MS_OUT, portname, &port_settings, interface_out);
 168         } else
 169 #endif
 170         {
 171                 char *ifname = interface_out->name;
 172 #ifdef WITH_MISDN
 173                 struct mISDNport *mISDNport;
 174                 int channel = 0;
 175                 int mode = B_MODE_TRANSPARENT;
 176
 177                 /* hunt for mISDNport and create Port */
 178                 mISDNport = hunt_port(ifname, &channel);
 179                 if (!mISDNport) {
 180                         trace_header("INTERFACE (busy)", DIRECTION_NONE);
 181                         add_trace("interface", NULL, "%s", ifname);
 182                         end_trace();
 183                         cause = 33;
 184                         goto fail;
 185                 }
 186
 187                 SPRINT(portname, "%s-%d-out", mISDNport->ifport->interface->name, mISDNport->portnum);
 188 #ifdef WITH_SS5
 189                 if (mISDNport->ss5)
 190                         port = ss5_hunt_line(mISDNport);
 191                 else
 192 #endif
 193 #ifdef ISDN_P_FXS_POTS
 194                 if (mISDNport->pots)
 195                         port = new Pfxs(PORT_TYPE_POTS_FXS_OUT, mISDNport, portname, &port_settings, mISDNport->ifport->interface, mode);
 196                 else
 197 #endif
 198                         port = new Pdss1((mISDNport->ntmode)?PORT_TYPE_DSS1_NT_OUT:PORT_TYPE_DSS1_TE_OUT, mISDNport, portname, &port_settings, mISDNport->ifport->interface, channel, mISDNport->ifport->channel_force, mode);
 199 #else
 200                 trace_header("INTERFACE (has no function)", DIRECTION_NONE);
 201                 add_trace("interface", NULL, "%s", ifname);
 202                 end_trace();
 203                 cause = 31;
 204                 goto fail;
 205 #endif
 206         }
 207         if (!port)
 208                 FATAL("Remote interface, but not supported???\n");
 209         portlist = ea_endpoint->portlist_new(port->p_serial, port->p_type, interface_out->is_earlyb == IS_YES);
 210         if (!portlist)
 211                 FATAL("EPOINT(%d) cannot allocate port_list relation\n", ea_endpoint->ep_serial);
 212         /* forward setup */
 213         message_forward(ea_endpoint->ep_serial, port->p_serial, EPOINT_TO_PORT, param);
 214
 215         /* apply bridge to interfaces */
 216         /* FIXME: use mISDN bridge for mISDN ports */
 217         bridge_id = join_serial++;
 218         message = message_create(ea_endpoint->ep_serial, source_port_id, EPOINT_TO_PORT, MESSAGE_BRIDGE);
 219         message->param.bridge_id = bridge_id;
 220         message_put(message);
 221         message = message_create(ea_endpoint->ep_serial, port->p_serial, EPOINT_TO_PORT, MESSAGE_BRIDGE);
 222         message->param.bridge_id = bridge_id;
 223         message_put(message);
 224 }
 225
 226 /* port MESSAGE_RELEASE */
 227 void EndpointAppBridge::port_release(struct port_list *portlist, int message_type, union parameter *param)
 228 {
 229         struct port_list *remote;
 230
 231         PDEBUG(DEBUG_EPOINT, "EPOINT(%d) epoint received release from port\n");
 232
 233         if (!ea_endpoint->ep_portlist || !ea_endpoint->ep_portlist->next)
 234                 goto out;
 235         if (ea_endpoint->ep_portlist->port_id == portlist->port_id)
 236                 remote = ea_endpoint->ep_portlist->next;
 237         else
 238                 remote = ea_endpoint->ep_portlist;
 239         /* forward release */
 240         message_forward(ea_endpoint->ep_serial, remote->port_id, EPOINT_TO_PORT, param);
 241
 242         /* remove relations to in and out port */
 243         ea_endpoint->free_portlist(portlist);
 244         ea_endpoint->free_portlist(remote);
 245
 246 out:
 247         /* destroy endpoint */
 248         ea_endpoint->ep_use = 0;
 249         trigger_work(&ea_endpoint->ep_delete);
 250 }
 251
 252 /* port other messages */
 253 void EndpointAppBridge::port_other(struct port_list *portlist, int message_type, union parameter *param)
 254 {
 255         unsigned int remote;
 256
 257         PDEBUG(DEBUG_EPOINT, "EPOINT(%d) epoint received message %d from port\n", message_type);
 258
 259         if (!ea_endpoint->ep_portlist || !ea_endpoint->ep_portlist->next)
 260                 return;
 261         if (ea_endpoint->ep_portlist->port_id == portlist->port_id)
 262                 remote = ea_endpoint->ep_portlist->next->port_id;
 263         else
 264                 remote = ea_endpoint->ep_portlist->port_id;
 265         /* forward release */
 266         message_forward(ea_endpoint->ep_serial, remote, EPOINT_TO_PORT, param);
 267 }
 268
 269 /* port sends message to the endpoint
 270  */
 271 void EndpointAppBridge::ea_message_port(unsigned int port_id, int message_type, union parameter *param)
 272 {
 273         struct port_list *portlist;
 274
 275         portlist = ea_endpoint->ep_portlist;
 276         while(portlist) {
 277                 if (port_id == portlist->port_id)
 278                         break;
 279                 portlist = portlist->next;
 280         }
 281         if (!portlist) {
 282                 PDEBUG(DEBUG_EPOINT, "EPOINT(%d) warning: port is not related to this endpoint. This may happen, if port has been released after the message was created.\n", ea_endpoint->ep_serial);
 283                 return;
 284         }
 285
 286 //      PDEBUG(DEBUG_EPOINT, "received message %d (terminal %s, caller id %s)\n", message, e_ext.number, e_callerinfo.id);
 287         switch(message_type) {
 288                 /* PORT sends SETUP message */
 289                 case MESSAGE_SETUP:
 290                 port_setup(portlist, message_type, param);
 291                 break;
 292
 293                 /* PORT sends RELEASE message */
 294                 case MESSAGE_RELEASE:
 295                 port_release(portlist, message_type, param);
 296                 break;
 297
 298                 default:
 299                 port_other(portlist, message_type, param);
 300         }
 301
 302         /* Note: this endpoint may be destroyed, so we MUST return */
 303 }
 304