src/socket.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 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 /* $Core: libIRCDsocket */
  15
  16 #include "inspircd.h"
  17 #include "socket.h"
  18 #include "socketengine.h"
  19 #include "wildcard.h"
  20
  21 using namespace irc::sockets;
  22
  23 /* Private static member data must be initialized in this manner */
  24 unsigned int ListenSocket::socketcount = 0;
  25 sockaddr* ListenSocket::sock_us = NULL;
  26 sockaddr* ListenSocket::client = NULL;
  27 sockaddr* ListenSocket::raddr = NULL;
  28
  29 /* Used when comparing CIDR masks for the modulus bits left over.
  30  * A lot of ircd's seem to do this:
  31  * ((-1) << (8 - (mask % 8)))
  32  * But imho, it sucks in comparison to a nice neat lookup table.
  33  */
  34 const unsigned char inverted_bits[8] = {        0x00, /* 00000000 - 0 bits - never actually used */
  35                                 0x80, /* 10000000 - 1 bits */
  36                                 0xC0, /* 11000000 - 2 bits */
  37                                 0xE0, /* 11100000 - 3 bits */
  38                                 0xF0, /* 11110000 - 4 bits */
  39                                 0xF8, /* 11111000 - 5 bits */
  40                                 0xFC, /* 11111100 - 6 bits */
  41                                 0xFE  /* 11111110 - 7 bits */
  42 };
  43
  44
  45 ListenSocket::ListenSocket(InspIRCd* Instance, int port, char* addr) : ServerInstance(Instance), desc("plaintext"), bind_addr(addr), bind_port(port)
  46 {
  47         this->SetFd(OpenTCPSocket(addr));
  48         if (this->GetFd() > -1)
  49         {
  50                 if (!Instance->BindSocket(this->fd,port,addr))
  51                         this->fd = -1;
  52 #ifdef IPV6
  53                 if ((!*addr) || (strchr(addr,':')))
  54                         this->family = AF_INET6;
  55                 else
  56 #endif
  57                 this->family = AF_INET;
  58                 Instance->SE->AddFd(this);
  59         }
  60         /* Saves needless allocations */
  61         if (socketcount == 0)
  62         {
  63                 /* All instances of ListenSocket share these, so reference count it */
  64                 ServerInstance->Logs->Log("SOCKET", DEBUG,"Allocate sockaddr structures");
  65                 sock_us = new sockaddr[2];
  66                 client = new sockaddr[2];
  67                 raddr = new sockaddr[2];
  68         }
  69         socketcount++;
  70 }
  71
  72 ListenSocket::~ListenSocket()
  73 {
  74         if (this->GetFd() > -1)
  75         {
  76                 ServerInstance->SE->DelFd(this);
  77                 ServerInstance->Logs->Log("SOCKET", DEBUG,"Shut down listener on fd %d", this->fd);
  78                 if (ServerInstance->SE->Shutdown(this, 2) || ServerInstance->SE->Close(this))
  79                         ServerInstance->Logs->Log("SOCKET", DEBUG,"Failed to cancel listener: %s", strerror(errno));
  80                 this->fd = -1;
  81         }
  82         socketcount--;
  83         if (socketcount == 0)
  84         {
  85                 delete[] sock_us;
  86                 delete[] client;
  87                 delete[] raddr;
  88         }
  89 }
  90
  91 void ListenSocket::HandleEvent(EventType e, int err)
  92 {
  93         switch (e)
  94         {
  95                 case EVENT_ERROR:
  96                         ServerInstance->Logs->Log("SOCKET",DEBUG,"HandleEvent for listensocket GOT AN ERROR! well shit! '%s'", strerror(err));
  97                 break;
  98                 case EVENT_WRITE:
  99                         ServerInstance->Logs->Log("SOCKET",DEBUG,"*** BUG *** HandleEvent for listensocket got a WRITE event!!!");
 100                 break;
 101                 case EVENT_READ:
 102                 {
 103                         ServerInstance->Logs->Log("SOCKET",DEBUG,"HandleEvent for Listensoket");
 104                         socklen_t uslen, length;                // length of our port number
 105                         int incomingSockfd, in_port;
 106
 107 #ifdef IPV6
 108                         if (this->family == AF_INET6)
 109                         {
 110                                 uslen = sizeof(sockaddr_in6);
 111                                 length = sizeof(sockaddr_in6);
 112                         }
 113                         else
 114 #endif
 115                         {
 116                                 uslen = sizeof(sockaddr_in);
 117                                 length = sizeof(sockaddr_in);
 118                         }
 119
 120                         ServerInstance->Logs->Log("SOCKET",DEBUG,"Call to accept with client=%08lx, length=%d", client, length);
 121                         incomingSockfd = ServerInstance->SE->Accept(this, (sockaddr*)client, &length);
 122                         ServerInstance->Logs->Log("SOCKET",DEBUG,"Accept returned %d: %d", WSAGetLastError());
 123
 124                         if ((incomingSockfd > -1) && (!ServerInstance->SE->GetSockName(this, sock_us, &uslen)))
 125                         {
 126                                 char buf[MAXBUF];
 127                                 char target[MAXBUF];
 128
 129                                 *target = *buf = '\0';
 130
 131 #ifdef IPV6
 132                                 if (this->family == AF_INET6)
 133                                 {
 134                                         in_port = ntohs(((sockaddr_in6*)sock_us)->sin6_port);
 135                                         inet_ntop(AF_INET6, &((const sockaddr_in6*)client)->sin6_addr, buf, sizeof(buf));
 136                                         socklen_t raddrsz = sizeof(sockaddr_in6);
 137                                         if (getpeername(incomingSockfd, (sockaddr*) raddr, &raddrsz) == 0)
 138                                                 inet_ntop(AF_INET6, &((const sockaddr_in6*)raddr)->sin6_addr, target, sizeof(target));
 139                                         else
 140                                                 ServerInstance->Logs->Log("SOCKET", DEBUG, "Can't get peername: %s", strerror(errno));
 141                                 }
 142                                 else
 143 #endif
 144                                 {
 145                                         inet_ntop(AF_INET, &((const sockaddr_in*)client)->sin_addr, buf, sizeof(buf));
 146                                         in_port = ntohs(((sockaddr_in*)sock_us)->sin_port);
 147                                         socklen_t raddrsz = sizeof(sockaddr_in);
 148                                         if (getpeername(incomingSockfd, (sockaddr*) raddr, &raddrsz) == 0)
 149                                                 inet_ntop(AF_INET, &((const sockaddr_in*)raddr)->sin_addr, target, sizeof(target));
 150                                         else
 151                                                 ServerInstance->Logs->Log("SOCKET", DEBUG, "Can't get peername: %s", strerror(errno));
 152                                 }
 153
 154                                 ServerInstance->SE->NonBlocking(incomingSockfd);
 155                                 ServerInstance->stats->statsAccept++;
 156                                 ServerInstance->Users->AddUser(ServerInstance, incomingSockfd, in_port, false, this->family, client, target);
 157                         }
 158                         else
 159                         {
 160                                 ServerInstance->SE->Shutdown(incomingSockfd, 2);
 161                                 ServerInstance->SE->Close(incomingSockfd);
 162                                 ServerInstance->stats->statsRefused++;
 163                         }
 164                 }
 165                 break;
 166         }
 167 }
 168
 169 /* Match raw bytes using CIDR bit matching, used by higher level MatchCIDR() */
 170 bool irc::sockets::MatchCIDRBits(unsigned char* address, unsigned char* mask, unsigned int mask_bits)
 171 {
 172         unsigned int divisor = mask_bits / 8; /* Number of whole bytes in the mask */
 173         unsigned int modulus = mask_bits % 8; /* Remaining bits in the mask after whole bytes are dealt with */
 174
 175         /* First (this is faster) compare the odd bits with logic ops */
 176         if (modulus)
 177                 if ((address[divisor] & inverted_bits[modulus]) != (mask[divisor] & inverted_bits[modulus]))
 178                         /* If they dont match, return false */
 179                         return false;
 180
 181         /* Secondly (this is slower) compare the whole bytes */
 182         if (memcmp(address, mask, divisor))
 183                 return false;
 184
 185         /* The address matches the mask, to mask_bits bits of mask */
 186         return true;
 187 }
 188
 189 /* Match CIDR, but dont attempt to match() against leading *!*@ sections */
 190 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask)
 191 {
 192         return MatchCIDR(address, cidr_mask, false);
 193 }
 194
 195 /* 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
 196  * If you have a lot of hosts to match, youre probably better off building your mask once
 197  * and then using the lower level MatchCIDRBits directly.
 198  *
 199  * This will also attempt to match any leading usernames or nicknames on the mask, using
 200  * match(), when match_with_username is true.
 201  */
 202 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask, bool match_with_username)
 203 {
 204         unsigned char addr_raw[16];
 205         unsigned char mask_raw[16];
 206         unsigned int bits = 0;
 207         char* mask = NULL;
 208
 209         /* The caller is trying to match ident@<mask>/bits.
 210          * Chop off the ident@ portion, use match() on it
 211          * seperately.
 212          */
 213         if (match_with_username)
 214         {
 215                 /* Duplicate the strings, and try to find the position
 216                  * of the @ symbol in each */
 217                 char* address_dupe = strdup(address);
 218                 char* cidr_dupe = strdup(cidr_mask);
 219
 220                 /* Use strchr not strrchr, because its going to be nearer to the left */
 221                 char* username_mask_pos = strrchr(cidr_dupe, '@');
 222                 char* username_addr_pos = strrchr(address_dupe, '@');
 223
 224                 /* Both strings have an @ symbol in them */
 225                 if (username_mask_pos && username_addr_pos)
 226                 {
 227                         /* Zero out the location of the @ symbol */
 228                         *username_mask_pos = *username_addr_pos = 0;
 229
 230                         /* Try and match() the strings before the @
 231                          * symbols, and recursively call MatchCIDR without
 232                          * username matching enabled to match the host part.
 233                          */
 234                         bool result = (match(address_dupe, cidr_dupe) && MatchCIDR(username_addr_pos + 1, username_mask_pos + 1, false));
 235
 236                         /* Free the stuff we created */
 237                         free(address_dupe);
 238                         free(cidr_dupe);
 239
 240                         /* Return a result */
 241                         return result;
 242                 }
 243                 else
 244                 {
 245                         /* One or both didnt have an @ in,
 246                          * just match as CIDR
 247                          */
 248                         free(address_dupe);
 249                         free(cidr_dupe);
 250                         mask = strdup(cidr_mask);
 251                 }
 252         }
 253         else
 254         {
 255                 /* Make a copy of the cidr mask string,
 256                  * we're going to change it
 257                  */
 258                 mask = strdup(cidr_mask);
 259         }
 260
 261         in_addr  address_in4;
 262         in_addr  mask_in4;
 263
 264
 265         /* Use strrchr for this, its nearer to the right */
 266         char* bits_chars = strrchr(mask,'/');
 267
 268         if (bits_chars)
 269         {
 270                 bits = atoi(bits_chars + 1);
 271                 *bits_chars = 0;
 272         }
 273         else
 274         {
 275                 /* No 'number of bits' field! */
 276                 free(mask);
 277                 return false;
 278         }
 279
 280 #ifdef SUPPORT_IP6LINKS
 281         in6_addr address_in6;
 282         in6_addr mask_in6;
 283
 284         if (inet_pton(AF_INET6, address, &address_in6) > 0)
 285         {
 286                 if (inet_pton(AF_INET6, mask, &mask_in6) > 0)
 287                 {
 288                         memcpy(&addr_raw, &address_in6.s6_addr, 16);
 289                         memcpy(&mask_raw, &mask_in6.s6_addr, 16);
 290
 291                         if (bits > 128)
 292                                 bits = 128;
 293                 }
 294                 else
 295                 {
 296                         /* The address was valid ipv6, but the mask
 297                          * that goes with it wasnt.
 298                          */
 299                         free(mask);
 300                         return false;
 301                 }
 302         }
 303         else
 304 #endif
 305         if (inet_pton(AF_INET, address, &address_in4) > 0)
 306         {
 307                 if (inet_pton(AF_INET, mask, &mask_in4) > 0)
 308                 {
 309                         memcpy(&addr_raw, &address_in4.s_addr, 4);
 310                         memcpy(&mask_raw, &mask_in4.s_addr, 4);
 311
 312                         if (bits > 32)
 313                                 bits = 32;
 314                 }
 315                 else
 316                 {
 317                         /* The address was valid ipv4,
 318                          * but the mask that went with it wasnt.
 319                          */
 320                         free(mask);
 321                         return false;
 322                 }
 323         }
 324         else
 325         {
 326                 /* The address was neither ipv4 or ipv6 */
 327                 free(mask);
 328                 return false;
 329         }
 330
 331         /* Low-level-match the bits in the raw data */
 332         free(mask);
 333         return MatchCIDRBits(addr_raw, mask_raw, bits);
 334 }
 335
 336 /** This will bind a socket to a port. It works for UDP/TCP.
 337  * It can only bind to IP addresses, if you wish to bind to hostnames
 338  * you should first resolve them using class 'Resolver'.
 339  */
 340 bool InspIRCd::BindSocket(int sockfd, int port, const char* addr, bool dolisten)
 341 {
 342         /* We allocate 2 of these, because sockaddr_in6 is larger than sockaddr (ugh, hax) */
 343         sockaddr* servaddr = new sockaddr[2];
 344         memset(servaddr,0,sizeof(sockaddr)*2);
 345
 346         int ret, size;
 347
 348         if (*addr == '*')
 349                 addr = "";
 350
 351 #ifdef IPV6
 352         if (*addr)
 353         {
 354                 /* There is an address here. Is it ipv6? */
 355                 if (strchr(addr,':'))
 356                 {
 357                         /* Yes it is */
 358                         in6_addr addy;
 359                         if (inet_pton(AF_INET6, addr, &addy) < 1)
 360                         {
 361                                 delete[] servaddr;
 362                                 return false;
 363                         }
 364
 365                         ((sockaddr_in6*)servaddr)->sin6_family = AF_INET6;
 366                         memcpy(&(((sockaddr_in6*)servaddr)->sin6_addr), &addy, sizeof(in6_addr));
 367                         ((sockaddr_in6*)servaddr)->sin6_port = htons(port);
 368                         size = sizeof(sockaddr_in6);
 369                 }
 370                 else
 371                 {
 372                         /* No, its not */
 373                         in_addr addy;
 374                         if (inet_pton(AF_INET, addr, &addy) < 1)
 375                         {
 376                                 delete[] servaddr;
 377                                 return false;
 378                         }
 379
 380                         ((sockaddr_in*)servaddr)->sin_family = AF_INET;
 381                         ((sockaddr_in*)servaddr)->sin_addr = addy;
 382                         ((sockaddr_in*)servaddr)->sin_port = htons(port);
 383                         size = sizeof(sockaddr_in);
 384                 }
 385         }
 386         else
 387         {
 388                 if (port == -1)
 389                 {
 390                         /* Port -1: Means UDP IPV4 port binding - Special case
 391                          * used by DNS engine.
 392                          */
 393                         ((sockaddr_in*)servaddr)->sin_family = AF_INET;
 394                         ((sockaddr_in*)servaddr)->sin_addr.s_addr = htonl(INADDR_ANY);
 395                         ((sockaddr_in*)servaddr)->sin_port = 0;
 396                         size = sizeof(sockaddr_in);
 397                 }
 398                 else
 399                 {
 400                         /* Theres no address here, default to ipv6 bind to all */
 401                         ((sockaddr_in6*)servaddr)->sin6_family = AF_INET6;
 402                         memset(&(((sockaddr_in6*)servaddr)->sin6_addr), 0, sizeof(in6_addr));
 403                         ((sockaddr_in6*)servaddr)->sin6_port = htons(port);
 404                         size = sizeof(sockaddr_in6);
 405                 }
 406         }
 407 #else
 408         /* If we aren't built with ipv6, the choice becomes simple */
 409         ((sockaddr_in*)servaddr)->sin_family = AF_INET;
 410         if (*addr)
 411         {
 412                 /* There is an address here. */
 413                 in_addr addy;
 414                 if (inet_pton(AF_INET, addr, &addy) < 1)
 415                 {
 416                         delete[] servaddr;
 417                         return false;
 418                 }
 419                 ((sockaddr_in*)servaddr)->sin_addr = addy;
 420         }
 421         else
 422         {
 423                 /* Bind ipv4 to all */
 424                 ((sockaddr_in*)servaddr)->sin_addr.s_addr = htonl(INADDR_ANY);
 425         }
 426         /* Bind ipv4 port number */
 427         ((sockaddr_in*)servaddr)->sin_port = htons(port);
 428         size = sizeof(sockaddr_in);
 429 #endif
 430         ret = SE->Bind(sockfd, servaddr, size);
 431         delete[] servaddr;
 432
 433         if (ret < 0)
 434         {
 435                 return false;
 436         }
 437         else
 438         {
 439                 if (dolisten)
 440                 {
 441                         if (SE->Listen(sockfd, Config->MaxConn) == -1)
 442                         {
 443                                 this->Logs->Log("SOCKET",DEFAULT,"ERROR in listen(): %s",strerror(errno));
 444                                 return false;
 445                         }
 446                         else
 447                         {
 448                                 this->Logs->Log("SOCKET",DEBUG,"New socket binding for %d with listen: %s:%d", sockfd, addr, port);
 449                                 SE->NonBlocking(sockfd);
 450                                 return true;
 451                         }
 452                 }
 453                 else
 454                 {
 455                         this->Logs->Log("SOCKET",DEBUG,"New socket binding for %d without listen: %s:%d", sockfd, addr, port);
 456                         return true;
 457                 }
 458         }
 459 }
 460
 461 // Open a TCP Socket
 462 int irc::sockets::OpenTCPSocket(char* addr, int socktype)
 463 {
 464         int sockfd;
 465         int on = 1;
 466         addr = addr;
 467         struct linger linger = { 0, 0 };
 468 #ifdef IPV6
 469         if (strchr(addr,':') || (!*addr))
 470                 sockfd = socket (PF_INET6, socktype, 0);
 471         else
 472                 sockfd = socket (PF_INET, socktype, 0);
 473         if (sockfd < 0)
 474 #else
 475         if ((sockfd = socket (PF_INET, socktype, 0)) < 0)
 476 #endif
 477         {
 478                 return ERROR;
 479         }
 480         else
 481         {
 482                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (char*)&on, sizeof(on));
 483                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
 484                 linger.l_onoff = 1;
 485                 linger.l_linger = 1;
 486                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, (char*)&linger,sizeof(linger));
 487                 return (sockfd);
 488         }
 489 }
 490
 491 int InspIRCd::BindPorts(bool, int &ports_found, FailedPortList &failed_ports)
 492 {
 493         char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF];
 494         int bound = 0;
 495         bool started_with_nothing = (Config->ports.size() == 0);
 496         std::vector<std::pair<std::string, int> > old_ports;
 497
 498         /* XXX: Make a copy of the old ip/port pairs here */
 499         for (std::vector<ListenSocket*>::iterator o = Config->ports.begin(); o != Config->ports.end(); ++o)
 500                 old_ports.push_back(make_pair((*o)->GetIP(), (*o)->GetPort()));
 501
 502         for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 503         {
 504                 Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 505                 Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 506                 Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 507
 508                 if (strncmp(Addr, "::ffff:", 7) == 0)
 509                         this->Logs->Log("SOCKET",DEFAULT, "Using 4in6 (::ffff:) isn't recommended. You should bind IPv4 addresses directly instead.");
 510
 511                 if ((!*Type) || (!strcmp(Type,"clients")))
 512                 {
 513                         irc::portparser portrange(configToken, false);
 514                         int portno = -1;
 515                         while ((portno = portrange.GetToken()))
 516                         {
 517                                 if (*Addr == '*')
 518                                         *Addr = 0;
 519
 520                                 bool skip = false;
 521                                 for (std::vector<ListenSocket*>::iterator n = Config->ports.begin(); n != Config->ports.end(); ++n)
 522                                 {
 523                                         if (((*n)->GetIP() == Addr) && ((*n)->GetPort() == portno))
 524                                         {
 525                                                 skip = true;
 526                                                 /* XXX: Here, erase from our copy of the list */
 527                                                 for (std::vector<std::pair<std::string, int> >::iterator k = old_ports.begin(); k != old_ports.end(); ++k)
 528                                                 {
 529                                                         if ((k->first == Addr) && (k->second == portno))
 530                                                         {
 531                                                                 old_ports.erase(k);
 532                                                                 break;
 533                                                         }
 534                                                 }
 535                                         }
 536                                 }
 537                                 if (!skip)
 538                                 {
 539                                         ListenSocket* ll = new ListenSocket(this, portno, Addr);
 540                                         if (ll->GetFd() > -1)
 541                                         {
 542                                                 bound++;
 543                                                 Config->ports.push_back(ll);
 544                                         }
 545                                         else
 546                                         {
 547                                                 failed_ports.push_back(std::make_pair(Addr, portno));
 548                                         }
 549                                         ports_found++;
 550                                 }
 551                         }
 552                 }
 553         }
 554
 555         /* XXX: Here, anything left in our copy list, close as removed */
 556         if (!started_with_nothing)
 557         {
 558                 for (size_t k = 0; k < old_ports.size(); ++k)
 559                 {
 560                         for (std::vector<ListenSocket*>::iterator n = Config->ports.begin(); n != Config->ports.end(); ++n)
 561                         {
 562                                 if (((*n)->GetIP() == old_ports[k].first) && ((*n)->GetPort() == old_ports[k].second))
 563                                 {
 564                                         this->Logs->Log("SOCKET",DEFAULT,"Port binding %s:%d was removed from the config file, closing.", old_ports[k].first.c_str(), old_ports[k].second);
 565                                         delete *n;
 566                                         Config->ports.erase(n);
 567                                         break;
 568                                 }
 569                         }
 570                 }
 571         }
 572
 573         return bound;
 574 }
 575
 576 const char* irc::sockets::insp_ntoa(insp_inaddr n)
 577 {
 578         static char buf[1024];
 579         inet_ntop(AF_FAMILY, &n, buf, sizeof(buf));
 580         return buf;
 581 }
 582
 583 int irc::sockets::insp_aton(const char* a, insp_inaddr* n)
 584 {
 585         return inet_pton(AF_FAMILY, a, n);
 586 }
 587