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