src/connection.cpp

   1 #include <connection.h>
   2 #include <unistd.h>
   3 #include <fcntl.h>
   4 #include <sys/errno.h>
   5 #include <sys/ioctl.h>
   6 #include <sys/utsname.h>
   7 #include <vector>
   8 #include <string>
   9 #include <deque>
  10 #include "inspircd.h"
  11 #include "modules.h"
  12
  13 using namespace std;
  14
  15
  16 extern std::vector<Module*> modules;
  17 extern std::vector<ircd_module*> factory;
  18
  19 extern int MODCOUNT;
  20
  21
  22
  23 connection::connection()
  24 {
  25         fd = 0;
  26 }
  27
  28
  29 bool connection::CreateListener(char* host, int p)
  30 {
  31         sockaddr_in host_address;
  32         int flags;
  33         in_addr addy;
  34         int on = 0;
  35         struct linger linger = { 0 };
  36
  37         this->port = p;
  38
  39         fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  40         if (fd <= 0)
  41         {
  42                 return false;
  43         }
  44
  45         memset((void*)&host_address, 0, sizeof(host_address));
  46
  47         host_address.sin_family = AF_INET;
  48
  49         if (!strcmp(host,""))
  50         {
  51                 host_address.sin_addr.s_addr = htonl(INADDR_ANY);
  52         }
  53         else
  54         {
  55                 inet_aton(host,&addy);
  56                 host_address.sin_addr = addy;
  57         }
  58
  59         host_address.sin_port = htons(p);
  60
  61         if (bind(fd,(sockaddr*)&host_address,sizeof(host_address))<0)
  62         {
  63                 return false;
  64         }
  65
  66         // make the socket non-blocking
  67         flags = fcntl(fd, F_GETFL, 0);
  68         fcntl(fd, F_SETFL, flags | O_NONBLOCK);
  69
  70         this->port = p;
  71
  72         setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,(const char*)&on,sizeof(on));
  73         linger.l_onoff = 1;
  74         linger.l_linger = 0;
  75         setsockopt(fd,SOL_SOCKET,SO_LINGER,(const char*)&linger,sizeof(linger));
  76
  77         // attempt to increase socket sendq and recvq as high as its possible
  78         // to get them on linux.
  79         int sendbuf = 32768;
  80         int recvbuf = 32768;
  81         setsockopt(fd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
  82         setsockopt(fd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
  83
  84         listen(this->fd,5);
  85
  86         return true;
  87 }
  88
  89 char* ircd_connector::GetServerIP()
  90 {
  91         return this->host;
  92 }
  93
  94 int ircd_connector::GetServerPort()
  95 {
  96         return this->port;
  97 }
  98
  99 bool ircd_connector::SetHostAndPort(char* host, int port)
 100 {
 101         strncpy(this->host,host,160);
 102         this->port = port;
 103         return true;
 104 }
 105
 106 bool ircd_connector::SetHostAddress(char* host, int port)
 107 {
 108         strncpy(this->host,host,160);
 109         this->port = port;
 110         memset((void*)&addr, 0, sizeof(addr));
 111         addr.sin_family = AF_INET;
 112         inet_aton(host,&addr.sin_addr);
 113         addr.sin_port = htons(port);
 114         return true;
 115 }
 116
 117 void ircd_connector::SetServerPort(int p)
 118 {
 119         this->port = p;
 120 }
 121
 122 bool ircd_connector::MakeOutboundConnection(char* host, int port)
 123 {
 124         log(DEBUG,"MakeOutboundConnection: Original param: %s",host);
 125         hostent* hoste = gethostbyname(host);
 126         if (!hoste)
 127         {
 128                 log(DEBUG,"MakeOutboundConnection: gethostbyname was NULL, setting %s",host);
 129                 this->SetHostAddress(host,port);
 130                 SetHostAndPort(host,port);
 131         }
 132         else
 133         {
 134                 struct in_addr* ia = (in_addr*)hoste->h_addr;
 135                 log(DEBUG,"MakeOutboundConnection: gethostbyname was valid, setting %s",inet_ntoa(*ia));
 136                 this->SetHostAddress(inet_ntoa(*ia),port);
 137                 SetHostAndPort(inet_ntoa(*ia),port);
 138         }
 139
 140         this->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 141         if (this->fd >= 0)
 142         {
 143                 if(connect(this->fd, (sockaddr*)&this->addr,sizeof(this->addr)))
 144                 {
 145                         WriteOpers("connect() failed for %s",host);
 146                         RemoveServer(this->servername.c_str());
 147                         return false;
 148                 }
 149                 int flags = fcntl(this->fd, F_GETFL, 0);
 150                 fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 151                 int sendbuf = 32768;
 152                 int recvbuf = 32768;
 153                 setsockopt(this->fd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 154                 setsockopt(this->fd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 155                 return true;
 156         }
 157         else
 158         {
 159                 WriteOpers("socket() failed!");
 160                 RemoveServer(this->servername.c_str());
 161         }
 162
 163         return false;
 164 }
 165
 166
 167 bool connection::BeginLink(char* targethost, int port, char* password, char* servername, int myport)
 168 {
 169         char connect[MAXBUF];
 170
 171         ircd_connector connector;
 172         ircd_connector *cn = this->FindHost(servername);
 173
 174
 175         if (cn)
 176         {
 177                 WriteOpers("CONNECT aborted: Server %s already exists",servername);
 178                 return false;
 179         }
 180
 181
 182         if (this->fd)
 183         {
 184                 if (connector.MakeOutboundConnection(targethost,port))
 185                 {
 186                         // targethost has been turned into an ip...
 187                         // we dont want this as the server name.
 188                         connector.SetServerName(servername);
 189                         sprintf(connect,"S %s %s %d %d :%s",getservername().c_str(),password,myport,GetRevision(),getserverdesc().c_str());
 190                         connector.SetState(STATE_NOAUTH_OUTBOUND);
 191                         connector.SetHostAndPort(targethost, port);
 192                         this->connectors.push_back(connector);
 193                         return this->SendPacket(connect, servername);
 194                 }
 195                 else
 196                 {
 197                         connector.SetState(STATE_DISCONNECTED);
 198                         WriteOpers("Could not create outbound connection to %s:%d",targethost,port);
 199                 }
 200         }
 201         return false;
 202 }
 203
 204 bool connection::MeshCookie(char* targethost, int port, long cookie, char* servername)
 205 {
 206         char connect[MAXBUF];
 207
 208         ircd_connector connector;
 209
 210         WriteOpers("Establishing meshed link to %s:%d",servername,port);
 211
 212         if (this->fd)
 213         {
 214                 if (connector.MakeOutboundConnection(targethost,port))
 215                 {
 216                         // targethost has been turned into an ip...
 217                         // we dont want this as the server name.
 218                         connector.SetServerName(servername);
 219                         sprintf(connect,"- %d %s :%s",cookie,getservername().c_str(),getserverdesc().c_str());
 220                         connector.SetState(STATE_NOAUTH_OUTBOUND);
 221                         connector.SetHostAndPort(targethost, port);
 222                         connector.SetState(STATE_CONNECTED);
 223                         this->connectors.push_back(connector);
 224                         return this->SendPacket(connect, servername);
 225                 }
 226                 else
 227                 {
 228                         connector.SetState(STATE_DISCONNECTED);
 229                         WriteOpers("Could not create outbound connection to %s:%d",targethost,port);
 230                 }
 231         }
 232         return false;
 233 }
 234
 235 bool connection::AddIncoming(int fd, char* targethost, int sourceport)
 236 {
 237         char connect[MAXBUF];
 238
 239         ircd_connector connector;
 240
 241         // targethost has been turned into an ip...
 242         // we dont want this as the server name.
 243         connector.SetServerName(targethost);
 244         connector.SetDescriptor(fd);
 245         connector.SetState(STATE_NOAUTH_INBOUND);
 246         int flags = fcntl(fd, F_GETFL, 0);
 247         fcntl(fd, F_SETFL, flags | O_NONBLOCK);
 248         int sendbuf = 32768;
 249         int recvbuf = 32768;
 250         setsockopt(fd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 251         setsockopt(fd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 252         connector.SetHostAndPort(targethost, sourceport);
 253         connector.SetState(STATE_NOAUTH_INBOUND);
 254         log(DEBUG,"connection::AddIncoming() Added connection: %s:%d",targethost,sourceport);
 255         this->connectors.push_back(connector);
 256         return true;
 257 }
 258
 259 void connection::TerminateLink(char* targethost)
 260 {
 261         // this locates the targethost in the connection::connectors vector of the class,
 262         // and terminates it by sending it an SQUIT token and closing its descriptor.
 263         // TerminateLink with a null string causes a terminate of ALL links
 264 }
 265
 266
 267 // Returns a pointer to the connector for 'host'
 268 ircd_connector* connection::FindHost(std::string host)
 269 {
 270         for (int i = 0; i < this->connectors.size(); i++)
 271         {
 272                 if (this->connectors[i].GetServerName() == host)
 273                 {
 274                         return &this->connectors[i];
 275                 }
 276         }
 277         return NULL;
 278 }
 279
 280 std::string ircd_connector::GetServerName()
 281 {
 282         return this->servername;
 283 }
 284
 285 std::string ircd_connector::GetDescription()
 286 {
 287         return this->description;
 288 }
 289
 290 void ircd_connector::SetServerName(std::string serv)
 291 {
 292         this->servername = serv;
 293 }
 294
 295 void ircd_connector::SetDescription(std::string desc)
 296 {
 297         this->description = desc;
 298 }
 299
 300
 301 int ircd_connector::GetDescriptor()
 302 {
 303         return this->fd;
 304 }
 305
 306 int ircd_connector::GetState()
 307 {
 308         return this->state;
 309 }
 310
 311
 312 void ircd_connector::SetState(int state)
 313 {
 314         this->state = state;
 315         if (state == STATE_DISCONNECTED)
 316         {
 317                 NetSendMyRoutingTable();
 318         }
 319 }
 320
 321 void ircd_connector::CloseConnection()
 322 {
 323         int flags = fcntl(this->fd, F_GETFL, 0);
 324         fcntl(this->fd, F_SETFL, flags ^ O_NONBLOCK);
 325         close(this->fd);
 326         flags = fcntl(this->fd, F_GETFL, 0);
 327         fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 328 }
 329
 330 void ircd_connector::SetDescriptor(int fd)
 331 {
 332         this->fd = fd;
 333 }
 334
 335 bool connection::SendPacket(char *message, const char* host)
 336 {
 337         if ((!message) || (!host))
 338                 return true;
 339
 340         ircd_connector* cn = this->FindHost(host);
 341
 342         if (!strchr(message,'\n'))
 343         {
 344                 strncat(message,"\n",MAXBUF);
 345         }
 346
 347         if (cn)
 348         {
 349                 log(DEBUG,"main: Connection::SendPacket() sent '%s' to %s",message,cn->GetServerName().c_str());
 350
 351                 if (cn->GetState() == STATE_DISCONNECTED)
 352                 {
 353                         log(DEBUG,"Main route to %s is down, seeking alternative",host);
 354                         // fix: can only route one hop to avoid a loop
 355                         if (strncat(message,"R ",2))
 356                         {
 357                                 // this route is down, we must re-route the packet through an available point in the mesh.
 358                                 for (int k = 0; k < this->connectors.size(); k++)
 359                                 {
 360                                         // search for another point in the mesh which can 'reach' where we want to go
 361                                         for (int m = 0; m < this->connectors[k].routes.size(); m++)
 362                                         {
 363                                                 if (!strcasecmp(this->connectors[k].routes[m].c_str(),host))
 364                                                 {
 365                                                         log(DEBUG,"Found alternative route for packet: %s",this->connectors[k].GetServerName().c_str());
 366                                                         char buffer[MAXBUF];
 367                                                         snprintf(buffer,MAXBUF,"R %s %s",host,message);
 368                                                         this->SendPacket(buffer,this->connectors[k].GetServerName().c_str());
 369                                                         return true;
 370                                                 }
 371                                         }
 372                                 }
 373                         }
 374                         char buffer[MAXBUF];
 375                         snprintf(buffer,MAXBUF,"& %s",host);
 376                         NetSendToAllExcept(host,buffer);
 377                         log(DEBUG,"There are no routes to %s, we're gonna boot the server off!",host);
 378                         DoSplit(host);
 379                         return false;
 380                 }
 381
 382                 // returns false if the packet could not be sent (e.g. target host down)
 383                 if (send(cn->GetDescriptor(),message,strlen(message),0)<0)
 384                 {
 385                         log(DEBUG,"send() failed for Connection::SendPacket(): %s",strerror(errno));
 386                         log(DEBUG,"Disabling connector: %s",cn->GetServerName().c_str());
 387                         cn->CloseConnection();
 388                         cn->SetState(STATE_DISCONNECTED);
 389                         // retry the packet along a new route so either arrival OR failure are gauranteed (bugfix)
 390                         return this->SendPacket(message,host);
 391                 }
 392                 return true;
 393         }
 394 }
 395
 396 // receives a packet from any where there is data waiting, first come, first served
 397 // fills the message and host values with the host where the data came from.
 398
 399 bool connection::RecvPacket(std::deque<std::string> &messages, char* host)
 400 {
 401         char data[32767];
 402         memset(data, 0, 32767);
 403         for (int i = 0; i < this->connectors.size(); i++)
 404         {
 405                 if (this->connectors[i].GetState() != STATE_DISCONNECTED)
 406                 {
 407                         // returns false if the packet could not be sent (e.g. target host down)
 408                         int rcvsize = 0;
 409                         rcvsize = recv(this->connectors[i].GetDescriptor(),data,32767,0);
 410                         if (rcvsize == -1)
 411                         {
 412                                 if (errno != EAGAIN)
 413                                 {
 414                                         log(DEBUG,"recv() failed for Connection::RecvPacket(): %s",strerror(errno));
 415                                         log(DEBUG,"Disabling connector: %s",this->connectors[i].GetServerName().c_str());
 416                                         this->connectors[i].CloseConnection();
 417                                         this->connectors[i].SetState(STATE_DISCONNECTED);
 418                                 }
 419                         }
 420                         if (rcvsize > 0)
 421                         {
 422                                 char* l = strtok(data,"\n");
 423                                 while (l)
 424                                 {
 425                                         char sanitized[32767];
 426                                         memset(sanitized, 0, 32767);
 427                                         int ptt = 0;
 428                                         for (int pt = 0; pt < strlen(l); pt++)
 429                                         {
 430                                                 if (l[pt] != '\r')
 431                                                 {
 432                                                         sanitized[ptt++] = l[pt];
 433                                                 }
 434                                         }
 435                                         sanitized[ptt] = '\0';
 436                                         if (strlen(sanitized))
 437                                         {
 438                                                 messages.push_back(sanitized);
 439                                                 strncpy(host,this->connectors[i].GetServerName().c_str(),160);
 440                                                 log(DEBUG,"main: Connection::RecvPacket() got '%s' from %s",sanitized,host);
 441
 442                                         }
 443                                         l = strtok(NULL,"\n");
 444                                 }
 445                                 return true;
 446                         }
 447                 }
 448         }
 449         // nothing new yet -- message and host will be undefined
 450         return false;
 451 }
 452
 453 long connection::GenKey()
 454 {
 455         srand(time(NULL));
 456         return (random()*time(NULL));
 457 }
 458