src/socket.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include <string>
  15 #include "configreader.h"
  16 #include "socket.h"
  17 #include "inspircd.h"
  18 #include "socketengine.h"
  19 #include "wildcard.h"
  20
  21 using namespace irc::sockets;
  22
  23 /* Used when comparing CIDR masks for the modulus bits left over.
  24  * A lot of ircd's seem to do this:
  25  * ((-1) << (8 - (mask % 8)))
  26  * But imho, it sucks in comparison to a nice neat lookup table.
  27  */
  28 const char inverted_bits[8] = { 0x00, /* 00000000 - 0 bits - never actually used */
  29                                 0x80, /* 10000000 - 1 bits */
  30                                 0xC0, /* 11000000 - 2 bits */
  31                                 0xE0, /* 11100000 - 3 bits */
  32                                 0xF0, /* 11110000 - 4 bits */
  33                                 0xF8, /* 11111000 - 5 bits */
  34                                 0xFC, /* 11111100 - 6 bits */
  35                                 0xFE  /* 11111110 - 7 bits */
  36 };
  37
  38
  39 ListenSocket::ListenSocket(InspIRCd* Instance, int sockfd, insp_sockaddr client, insp_sockaddr server, int port, char* addr) : ServerInstance(Instance), desc("plaintext")
  40 {
  41         this->SetFd(sockfd);
  42         Instance->Log(DEBUG,"Binding to port %s:%d",addr,port);
  43         if (!Instance->BindSocket(this->fd,client,server,port,addr))
  44         {
  45                 Instance->Log(DEBUG,"Binding failed!");
  46                 this->fd = -1;
  47         }
  48 }
  49
  50 ListenSocket::~ListenSocket()
  51 {
  52         if (this->GetFd() > -1)
  53         {
  54                 shutdown(this->fd, 2);
  55                 close(this->fd);
  56                 this->fd = -1;
  57         }
  58 }
  59
  60 void ListenSocket::HandleEvent(EventType et, int errornum)
  61 {
  62         insp_sockaddr sock_us;  // our port number
  63         socklen_t uslen;        // length of our port number
  64         insp_sockaddr client;
  65         socklen_t length;
  66         int incomingSockfd, in_port;
  67
  68         ServerInstance->Log(DEBUG,"Handle ListenSocket event");
  69
  70         uslen = sizeof(sock_us);
  71         length = sizeof(client);
  72         incomingSockfd = accept (this->GetFd(),(struct sockaddr*)&client, &length);
  73
  74         if ((incomingSockfd > -1) && (!getsockname(incomingSockfd, (sockaddr*)&sock_us, &uslen)))
  75         {
  76 #ifdef IPV6
  77                 in_port = ntohs(sock_us.sin6_port);
  78 #else
  79                 in_port = ntohs(sock_us.sin_port);
  80 #endif
  81                 ServerInstance->Log(DEBUG,"Accepted socket %d",incomingSockfd);
  82                 NonBlocking(incomingSockfd);
  83                 if (ServerInstance->Config->GetIOHook(in_port))
  84                 {
  85                         try
  86                         {
  87 #ifdef IPV6
  88                                 ServerInstance->Config->GetIOHook(in_port)->OnRawSocketAccept(incomingSockfd, insp_ntoa(client.sin6_addr), in_port);
  89 #else
  90                                 ServerInstance->Config->GetIOHook(in_port)->OnRawSocketAccept(incomingSockfd, insp_ntoa(client.sin_addr), in_port);
  91 #endif
  92                         }
  93                         catch (CoreException& modexcept)
  94                         {
  95                                 ServerInstance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
  96                         }
  97                 }
  98                 ServerInstance->stats->statsAccept++;
  99 #ifdef IPV6
 100                 ServerInstance->Log(DEBUG,"Add ipv6 client");
 101                 userrec::AddClient(ServerInstance, incomingSockfd, in_port, false, client.sin6_addr);
 102 #else
 103                 ServerInstance->Log(DEBUG,"Add ipv4 client");
 104                 userrec::AddClient(ServerInstance, incomingSockfd, in_port, false, client.sin_addr);
 105 #endif
 106                 ServerInstance->Log(DEBUG,"Adding client on port %d fd=%d",in_port,incomingSockfd);
 107         }
 108         else
 109         {
 110                 ServerInstance->Log(DEBUG,"Accept failed on fd %d: %s",incomingSockfd,strerror(errno));
 111                 shutdown(incomingSockfd,2);
 112                 close(incomingSockfd);
 113                 ServerInstance->stats->statsRefused++;
 114         }
 115 }
 116
 117 /* Match raw bytes using CIDR bit matching, used by higher level MatchCIDR() */
 118 bool irc::sockets::MatchCIDRBits(unsigned char* address, unsigned char* mask, unsigned int mask_bits)
 119 {
 120         unsigned int modulus = mask_bits % 8; /* Number of whole bytes in the mask */
 121         unsigned int divisor = mask_bits / 8; /* Remaining bits in the mask after whole bytes are dealt with */
 122
 123         /* First compare the whole bytes, if they dont match, return false */
 124         if (memcmp(address, mask, divisor))
 125                 return false;
 126
 127         /* Now if there are any remainder bits, we compare them with logic AND */
 128         if (modulus)
 129                 if ((address[divisor] & inverted_bits[modulus]) != (mask[divisor] & inverted_bits[modulus]))
 130                         /* If they dont match, return false */
 131                         return false;
 132
 133         /* The address matches the mask, to mask_bits bits of mask */
 134         return true;
 135 }
 136
 137 /* Match CIDR, but dont attempt to match() against leading *!*@ sections */
 138 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask)
 139 {
 140         return MatchCIDR(address, cidr_mask, false);
 141 }
 142
 143 /* Match CIDR strings, e.g. 127.0.0.1 to 127.0.0.0/8 or 3ffe:1:5:6::8 to 3ffe:1::0/32
 144  * If you have a lot of hosts to match, youre probably better off building your mask once
 145  * and then using the lower level MatchCIDRBits directly.
 146  *
 147  * This will also attempt to match any leading usernames or nicknames on the mask, using
 148  * match(), when match_with_username is true.
 149  */
 150 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask, bool match_with_username)
 151 {
 152         unsigned char addr_raw[16];
 153         unsigned char mask_raw[16];
 154         unsigned int bits = 0;
 155         char* mask = NULL;
 156
 157         /* The caller is trying to match ident@<mask>/bits.
 158          * Chop off the ident@ portion, use match() on it
 159          * seperately.
 160          */
 161         if (match_with_username)
 162         {
 163                 /* Duplicate the strings, and try to find the position
 164                  * of the @ symbol in each */
 165                 char* address_dupe = strdup(address);
 166                 char* cidr_dupe = strdup(cidr_mask);
 167
 168                 /* Use strchr not strrchr, because its going to be nearer to the left */
 169                 char* username_mask_pos = strrchr(cidr_dupe, '@');
 170                 char* username_addr_pos = strrchr(address_dupe, '@');
 171
 172                 /* Both strings have an @ symbol in them */
 173                 if (username_mask_pos && username_addr_pos)
 174                 {
 175                         /* Zero out the location of the @ symbol */
 176                         *username_mask_pos = *username_addr_pos = 0;
 177
 178                         /* Try and match() the strings before the @
 179                          * symbols, and recursively call MatchCIDR without
 180                          * username matching enabled to match the host part.
 181                          */
 182                         bool result = (match(address_dupe, cidr_dupe) && MatchCIDR(username_addr_pos + 1, username_mask_pos + 1, false));
 183
 184                         /* Free the stuff we created */
 185                         free(address_dupe);
 186                         free(cidr_dupe);
 187
 188                         /* Return a result */
 189                         return result;
 190                 }
 191                 else
 192                 {
 193                         /* One or both didnt have an @ in,
 194                          * just match as CIDR
 195                          */
 196                         free(address_dupe);
 197                         free(cidr_dupe);
 198                         mask = strdup(cidr_mask);
 199                 }
 200         }
 201         else
 202         {
 203                 /* Make a copy of the cidr mask string,
 204                  * we're going to change it
 205                  */
 206                 mask = strdup(cidr_mask);
 207         }
 208
 209         in_addr  address_in4;
 210         in_addr  mask_in4;
 211
 212
 213         /* Use strrchr for this, its nearer to the right */
 214         char* bits_chars = strrchr(mask,'/');
 215
 216         if (bits_chars)
 217         {
 218                 bits = atoi(bits_chars + 1);
 219                 *bits_chars = 0;
 220         }
 221         else
 222         {
 223                 /* No 'number of bits' field! */
 224                 free(mask);
 225                 return false;
 226         }
 227
 228 #ifdef SUPPORT_IP6LINKS
 229         in6_addr address_in6;
 230         in6_addr mask_in6;
 231
 232         if (inet_pton(AF_INET6, address, &address_in6) > 0)
 233         {
 234                 if (inet_pton(AF_INET6, mask, &mask_in6) > 0)
 235                 {
 236                         memcpy(&addr_raw, &address_in6.s6_addr, 16);
 237                         memcpy(&mask_raw, &mask_in6.s6_addr, 16);
 238
 239                         if (bits > 128)
 240                                 bits = 128;
 241                 }
 242                 else
 243                 {
 244                         /* The address was valid ipv6, but the mask
 245                          * that goes with it wasnt.
 246                          */
 247                         free(mask);
 248                         return false;
 249                 }
 250         }
 251         else
 252 #endif
 253         if (inet_pton(AF_INET, address, &address_in4) > 0)
 254         {
 255                 if (inet_pton(AF_INET, mask, &mask_in4) > 0)
 256                 {
 257                         memcpy(&addr_raw, &address_in4.s_addr, 4);
 258                         memcpy(&mask_raw, &mask_in4.s_addr, 4);
 259
 260                         if (bits > 32)
 261                                 bits = 32;
 262                 }
 263                 else
 264                 {
 265                         /* The address was valid ipv4,
 266                          * but the mask that went with it wasnt.
 267                          */
 268                         free(mask);
 269                         return false;
 270                 }
 271         }
 272         else
 273         {
 274                 /* The address was neither ipv4 or ipv6 */
 275                 free(mask);
 276                 return false;
 277         }
 278
 279         /* Low-level-match the bits in the raw data */
 280         free(mask);
 281         return MatchCIDRBits(addr_raw, mask_raw, bits);
 282 }
 283
 284 void irc::sockets::Blocking(int s)
 285 {
 286         int flags = fcntl(s, F_GETFL, 0);
 287         fcntl(s, F_SETFL, flags ^ O_NONBLOCK);
 288 }
 289
 290 void irc::sockets::NonBlocking(int s)
 291 {
 292         int flags = fcntl(s, F_GETFL, 0);
 293         fcntl(s, F_SETFL, flags | O_NONBLOCK);
 294 }
 295
 296 /** This will bind a socket to a port. It works for UDP/TCP.
 297  * It can only bind to IP addresses, if you wish to bind to hostnames
 298  * you should first resolve them using class 'Resolver'.
 299  */
 300 bool InspIRCd::BindSocket(int sockfd, insp_sockaddr client, insp_sockaddr server, int port, char* addr)
 301 {
 302         memset(&server,0,sizeof(server));
 303         insp_inaddr addy;
 304
 305         if (*addr == '*')
 306                 *addr = 0;
 307
 308         if ((*addr) && (insp_aton(addr,&addy) < 1))
 309         {
 310                 this->Log(DEBUG,"Invalid IP '%s' given to BindSocket()", addr);
 311                 return false;;
 312         }
 313
 314 #ifdef IPV6
 315         server.sin6_family = AF_FAMILY;
 316 #else
 317         server.sin_family = AF_FAMILY;
 318 #endif
 319         if (!*addr)
 320         {
 321 #ifdef IPV6
 322                 memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
 323 #else
 324                 server.sin_addr.s_addr = htonl(INADDR_ANY);
 325 #endif
 326         }
 327         else
 328         {
 329 #ifdef IPV6
 330                 memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
 331 #else
 332                 server.sin_addr = addy;
 333 #endif
 334         }
 335 #ifdef IPV6
 336         server.sin6_port = htons(port);
 337 #else
 338         server.sin_port = htons(port);
 339 #endif
 340         if (bind(sockfd,(struct sockaddr*)&server,sizeof(server)) < 0)
 341         {
 342                 return false;
 343         }
 344         else
 345         {
 346                 this->Log(DEBUG,"Bound port %s:%d",*addr ? addr : "*",port);
 347                 if (listen(sockfd, Config->MaxConn) == -1)
 348                 {
 349                         this->Log(DEFAULT,"ERROR in listen(): %s",strerror(errno));
 350                         return false;
 351                 }
 352                 else
 353                 {
 354                         NonBlocking(sockfd);
 355                         return true;
 356                 }
 357         }
 358 }
 359
 360
 361 // Open a TCP Socket
 362 int irc::sockets::OpenTCPSocket()
 363 {
 364         int sockfd;
 365         int on = 1;
 366         struct linger linger = { 0 };
 367
 368         if ((sockfd = socket (AF_FAMILY, SOCK_STREAM, 0)) < 0)
 369         {
 370                 return ERROR;
 371         }
 372         else
 373         {
 374                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 375                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
 376                 linger.l_onoff = 1;
 377                 linger.l_linger = 1;
 378                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &linger,sizeof(linger));
 379                 return (sockfd);
 380         }
 381 }
 382
 383 /* XXX: Probably belongs in class InspIRCd */
 384 bool InspIRCd::HasPort(int port, char* addr)
 385 {
 386         for (unsigned long count = 0; count < stats->BoundPortCount; count++)
 387         {
 388                 if ((port == Config->ports[count]) && (!strcasecmp(Config->addrs[count],addr)))
 389                 {
 390                         return true;
 391                 }
 392         }
 393         return false;
 394 }
 395
 396 /* XXX: Probably belongs in class InspIRCd */
 397 int InspIRCd::BindPorts(bool bail, int &ports_found, FailedPortList &failed_ports)
 398 {
 399         char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF];
 400         insp_sockaddr client, server;
 401         int clientportcount = 0;
 402         int BoundPortCount = 0;
 403
 404         ports_found = 0;
 405
 406         int InitialPortCount = stats->BoundPortCount;
 407         this->Log(DEBUG,"Initial port count: %d",InitialPortCount);
 408
 409         for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 410         {
 411                 Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 412                 Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 413                 Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 414
 415                 if ((!*Type) || (!strcmp(Type,"clients")))
 416                 {
 417                         irc::portparser portrange(configToken, false);
 418                         long portno = -1;
 419                         while ((portno = portrange.GetToken()))
 420                         {
 421                                 if (!HasPort(portno, Addr))
 422                                 {
 423                                         ports_found++;
 424                                         Config->ports[clientportcount+InitialPortCount] = portno;
 425                                         if (*Addr == '*')
 426                                                 *Addr = 0;
 427
 428                                         strlcpy(Config->addrs[clientportcount+InitialPortCount],Addr,256);
 429                                         clientportcount++;
 430                                         this->Log(DEBUG,"NEW binding %s:%d [%s] from config",Addr, portno, Type);
 431                                 }
 432                         }
 433                 }
 434
 435                 if (!bail)
 436                 {
 437                         int PortCount = clientportcount;
 438                         if (PortCount)
 439                         {
 440                                 BoundPortCount = stats->BoundPortCount;
 441                                 for (int count = InitialPortCount; count < InitialPortCount + PortCount; count++)
 442                                 {
 443                                         int fd = OpenTCPSocket();
 444                                         if (fd == ERROR)
 445                                         {
 446                                                 this->Log(DEBUG,"Bad fd %d binding port [%s:%d]",fd,Config->addrs[count],Config->ports[count]);
 447                                                 failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 448                                         }
 449                                         else
 450                                         {
 451                                                 Config->openSockfd[BoundPortCount] = new ListenSocket(this,fd,client,server,Config->ports[count],Config->addrs[count]);
 452                                                 if (Config->openSockfd[BoundPortCount]->GetFd() > -1)
 453                                                 {
 454                                                         if (!SE->AddFd(Config->openSockfd[BoundPortCount]))
 455                                                         {
 456                                                                 this->Log(DEFAULT,"ERK! Failed to add listening port to socket engine!");
 457                                                                 shutdown(Config->openSockfd[BoundPortCount]->GetFd(),2);
 458                                                                 close(Config->openSockfd[BoundPortCount]->GetFd());
 459                                                                 delete Config->openSockfd[BoundPortCount];
 460                                                                 failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 461                                                         }
 462                                                         else
 463                                                                 BoundPortCount++;
 464                                                 }
 465                                         }
 466                                 }
 467                                 return InitialPortCount + BoundPortCount;
 468                         }
 469                         else
 470                         {
 471                                 this->Log(DEBUG,"There is nothing new to bind!");
 472                         }
 473                         return InitialPortCount;
 474                 }
 475         }
 476
 477         int PortCount = clientportcount;
 478
 479         for (int count = 0; count < PortCount; count++)
 480         {
 481                 int fd = OpenTCPSocket();
 482                 if (fd == ERROR)
 483                 {
 484                         this->Log(DEBUG,"Bad fd %d binding port [%s:%d]",fd,Config->addrs[count],Config->ports[count]);
 485                         failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 486                 }
 487                 else
 488                 {
 489                         Config->openSockfd[BoundPortCount] = new ListenSocket(this,fd,client,server,Config->ports[count],Config->addrs[count]);
 490                         if (Config->openSockfd[BoundPortCount]->GetFd() > -1)
 491                         {
 492                                 BoundPortCount++;
 493                         }
 494                         else
 495                                 failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 496                 }
 497         }
 498         return BoundPortCount;
 499 }
 500
 501 const char* irc::sockets::insp_ntoa(insp_inaddr n)
 502 {
 503         static char buf[1024];
 504         inet_ntop(AF_FAMILY, &n, buf, sizeof(buf));
 505         return buf;
 506 }
 507
 508 int irc::sockets::insp_aton(const char* a, insp_inaddr* n)
 509 {
 510         return inet_pton(AF_FAMILY, a, n);
 511 }
 512