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,"CRAP");
  43         if (!Instance->BindSocket(this->fd,client,server,port,addr))
  44                 this->fd = -1;
  45 }
  46
  47 ListenSocket::~ListenSocket()
  48 {
  49         if (this->GetFd() > -1)
  50         {
  51                 shutdown(this->fd, 2);
  52                 close(this->fd);
  53                 this->fd = -1;
  54         }
  55 }
  56
  57 void ListenSocket::HandleEvent(EventType et, int errornum)
  58 {
  59         insp_sockaddr sock_us;  // our port number
  60         socklen_t uslen;        // length of our port number
  61         insp_sockaddr client;
  62         socklen_t length;
  63         int incomingSockfd, in_port;
  64         uslen = sizeof(sock_us);
  65         length = sizeof(client);
  66         incomingSockfd = accept (this->GetFd(),(struct sockaddr*)&client, &length);
  67
  68         if ((incomingSockfd > -1) && (!getsockname(incomingSockfd, (sockaddr*)&sock_us, &uslen)))
  69         {
  70 #ifdef IPV6
  71                 in_port = ntohs(sock_us.sin6_port);
  72 #else
  73                 in_port = ntohs(sock_us.sin_port);
  74 #endif
  75                 NonBlocking(incomingSockfd);
  76                 if (ServerInstance->Config->GetIOHook(in_port))
  77                 {
  78                         try
  79                         {
  80 #ifdef IPV6
  81                                 ServerInstance->Config->GetIOHook(in_port)->OnRawSocketAccept(incomingSockfd, insp_ntoa(client.sin6_addr), in_port);
  82 #else
  83                                 ServerInstance->Config->GetIOHook(in_port)->OnRawSocketAccept(incomingSockfd, insp_ntoa(client.sin_addr), in_port);
  84 #endif
  85                         }
  86                         catch (CoreException& modexcept)
  87                         {
  88                                 ServerInstance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
  89                         }
  90                 }
  91                 ServerInstance->stats->statsAccept++;
  92 #ifdef IPV6
  93                 userrec::AddClient(ServerInstance, incomingSockfd, in_port, false, client.sin6_addr);
  94 #else
  95                 userrec::AddClient(ServerInstance, incomingSockfd, in_port, false, client.sin_addr);
  96 #endif
  97         }
  98         else
  99         {
 100                 shutdown(incomingSockfd,2);
 101                 close(incomingSockfd);
 102                 ServerInstance->stats->statsRefused++;
 103         }
 104 }
 105
 106 /* Match raw bytes using CIDR bit matching, used by higher level MatchCIDR() */
 107 bool irc::sockets::MatchCIDRBits(unsigned char* address, unsigned char* mask, unsigned int mask_bits)
 108 {
 109         unsigned int modulus = mask_bits % 8; /* Number of whole bytes in the mask */
 110         unsigned int divisor = mask_bits / 8; /* Remaining bits in the mask after whole bytes are dealt with */
 111
 112         /* First compare the whole bytes, if they dont match, return false */
 113         if (memcmp(address, mask, divisor))
 114                 return false;
 115
 116         /* Now if there are any remainder bits, we compare them with logic AND */
 117         if (modulus)
 118                 if ((address[divisor] & inverted_bits[modulus]) != (mask[divisor] & inverted_bits[modulus]))
 119                         /* If they dont match, return false */
 120                         return false;
 121
 122         /* The address matches the mask, to mask_bits bits of mask */
 123         return true;
 124 }
 125
 126 /* Match CIDR, but dont attempt to match() against leading *!*@ sections */
 127 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask)
 128 {
 129         return MatchCIDR(address, cidr_mask, false);
 130 }
 131
 132 /* 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
 133  * If you have a lot of hosts to match, youre probably better off building your mask once
 134  * and then using the lower level MatchCIDRBits directly.
 135  *
 136  * This will also attempt to match any leading usernames or nicknames on the mask, using
 137  * match(), when match_with_username is true.
 138  */
 139 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask, bool match_with_username)
 140 {
 141         unsigned char addr_raw[16];
 142         unsigned char mask_raw[16];
 143         unsigned int bits = 0;
 144         char* mask = NULL;
 145
 146         /* The caller is trying to match ident@<mask>/bits.
 147          * Chop off the ident@ portion, use match() on it
 148          * seperately.
 149          */
 150         if (match_with_username)
 151         {
 152                 /* Duplicate the strings, and try to find the position
 153                  * of the @ symbol in each */
 154                 char* address_dupe = strdup(address);
 155                 char* cidr_dupe = strdup(cidr_mask);
 156
 157                 /* Use strchr not strrchr, because its going to be nearer to the left */
 158                 char* username_mask_pos = strrchr(cidr_dupe, '@');
 159                 char* username_addr_pos = strrchr(address_dupe, '@');
 160
 161                 /* Both strings have an @ symbol in them */
 162                 if (username_mask_pos && username_addr_pos)
 163                 {
 164                         /* Zero out the location of the @ symbol */
 165                         *username_mask_pos = *username_addr_pos = 0;
 166
 167                         /* Try and match() the strings before the @
 168                          * symbols, and recursively call MatchCIDR without
 169                          * username matching enabled to match the host part.
 170                          */
 171                         bool result = (match(address_dupe, cidr_dupe) && MatchCIDR(username_addr_pos + 1, username_mask_pos + 1, false));
 172
 173                         /* Free the stuff we created */
 174                         free(address_dupe);
 175                         free(cidr_dupe);
 176
 177                         /* Return a result */
 178                         return result;
 179                 }
 180                 else
 181                 {
 182                         /* One or both didnt have an @ in,
 183                          * just match as CIDR
 184                          */
 185                         free(address_dupe);
 186                         free(cidr_dupe);
 187                         mask = strdup(cidr_mask);
 188                 }
 189         }
 190         else
 191         {
 192                 /* Make a copy of the cidr mask string,
 193                  * we're going to change it
 194                  */
 195                 mask = strdup(cidr_mask);
 196         }
 197
 198         in_addr  address_in4;
 199         in_addr  mask_in4;
 200
 201
 202         /* Use strrchr for this, its nearer to the right */
 203         char* bits_chars = strrchr(mask,'/');
 204
 205         if (bits_chars)
 206         {
 207                 bits = atoi(bits_chars + 1);
 208                 *bits_chars = 0;
 209         }
 210         else
 211         {
 212                 /* No 'number of bits' field! */
 213                 free(mask);
 214                 return false;
 215         }
 216
 217 #ifdef SUPPORT_IP6LINKS
 218         in6_addr address_in6;
 219         in6_addr mask_in6;
 220
 221         if (inet_pton(AF_INET6, address, &address_in6) > 0)
 222         {
 223                 if (inet_pton(AF_INET6, mask, &mask_in6) > 0)
 224                 {
 225                         memcpy(&addr_raw, &address_in6.s6_addr, 16);
 226                         memcpy(&mask_raw, &mask_in6.s6_addr, 16);
 227
 228                         if (bits > 128)
 229                                 bits = 128;
 230                 }
 231                 else
 232                 {
 233                         /* The address was valid ipv6, but the mask
 234                          * that goes with it wasnt.
 235                          */
 236                         free(mask);
 237                         return false;
 238                 }
 239         }
 240         else
 241 #endif
 242         if (inet_pton(AF_INET, address, &address_in4) > 0)
 243         {
 244                 if (inet_pton(AF_INET, mask, &mask_in4) > 0)
 245                 {
 246                         memcpy(&addr_raw, &address_in4.s_addr, 4);
 247                         memcpy(&mask_raw, &mask_in4.s_addr, 4);
 248
 249                         if (bits > 32)
 250                                 bits = 32;
 251                 }
 252                 else
 253                 {
 254                         /* The address was valid ipv4,
 255                          * but the mask that went with it wasnt.
 256                          */
 257                         free(mask);
 258                         return false;
 259                 }
 260         }
 261         else
 262         {
 263                 /* The address was neither ipv4 or ipv6 */
 264                 free(mask);
 265                 return false;
 266         }
 267
 268         /* Low-level-match the bits in the raw data */
 269         free(mask);
 270         return MatchCIDRBits(addr_raw, mask_raw, bits);
 271 }
 272
 273 void irc::sockets::Blocking(int s)
 274 {
 275         int flags = fcntl(s, F_GETFL, 0);
 276         fcntl(s, F_SETFL, flags ^ O_NONBLOCK);
 277 }
 278
 279 void irc::sockets::NonBlocking(int s)
 280 {
 281         int flags = fcntl(s, F_GETFL, 0);
 282         fcntl(s, F_SETFL, flags | O_NONBLOCK);
 283 }
 284
 285 /** This will bind a socket to a port. It works for UDP/TCP.
 286  * It can only bind to IP addresses, if you wish to bind to hostnames
 287  * you should first resolve them using class 'Resolver'.
 288  */
 289 bool InspIRCd::BindSocket(int sockfd, insp_sockaddr clientn, insp_sockaddr servern, int port, char* addr)
 290 {
 291         /* We allocate 2 of these, because sockaddr_in6 is larger than sockaddr (ugh, hax) */
 292         sockaddr* server = new sockaddr[2];
 293         memset(server,0,sizeof(sockaddr)*2);
 294
 295         int ret, size;
 296
 297         if (*addr == '*')
 298                 *addr = 0;
 299
 300 #ifdef IPV6
 301         if (*addr)
 302         {
 303                 printf("Address %s not empty\n", addr);
 304                 /* There is an address here. Is it ipv6? */
 305                 if (strchr(addr,':'))
 306                 {
 307                         printf("Address %s is ipv6\n", addr);
 308                         /* Yes it is */
 309                         in6_addr addy;
 310                         if (inet_pton(AF_INET6, addr, &addy) < 1)
 311                         {
 312                                 printf("Failed to interpret address %s", addr);
 313                                 delete[] server;
 314                                 return false;
 315                         }
 316
 317                         ((sockaddr_in6*)server)->sin6_family = AF_INET6;
 318                         memcpy(&(((sockaddr_in6*)server)->sin6_addr), &addy, sizeof(in6_addr));
 319                         ((sockaddr_in6*)server)->sin6_port = htons(port);
 320                         size = sizeof(sockaddr_in6);
 321                 }
 322                 else
 323                 {
 324                         /* No, its not */
 325                         printf("Address %s is ipv4\n", addr);
 326                         in_addr addy;
 327                         if (inet_pton(AF_INET, addr, &addy) < 1)
 328                         {
 329                                 delete[] server;
 330                                 return false;
 331                         }
 332
 333                         ((sockaddr_in*)server)->sin_family = AF_INET;
 334                         ((sockaddr_in*)server)->sin_addr = addy;
 335                         ((sockaddr_in*)server)->sin_port = htons(port);
 336                         size = sizeof(sockaddr_in);
 337                 }
 338         }
 339         else
 340         {
 341                 printf("Address empty\n");
 342                 /* Theres no address here, default to ipv6 bind to all */
 343                 ((sockaddr_in6*)server)->sin6_family = AF_INET6;
 344                 memset(&(((sockaddr_in6*)server)->sin6_addr), 0, sizeof(in6_addr));
 345                 ((sockaddr_in6*)server)->sin6_port = htons(port);
 346                 size = sizeof(sockaddr_in6);
 347         }
 348 #else
 349         /* If we aren't built with ipv6, the choice becomes simple */
 350         ((sockaddr_in*)server)->sin_family = AF_INET;
 351         if (*addr)
 352         {
 353                 /* There is an address here. */
 354                 in_addr addy;
 355                 if (inet_pton(AF_INET, addr, &addy) < 1)
 356                 {
 357                         delete[] server;
 358                         return false;
 359                 }
 360                 ((sockaddr_in*)server)->sin_addr = addy;
 361         }
 362         else
 363         {
 364                 /* Bind ipv4 to all */
 365                 ((sockaddr_in*)server)->sin_addr.s_addr = htonl(INADDR_ANY);
 366         }
 367         /* Bind ipv4 port number */
 368         ((sockaddr_in*)server)->sin_port = htons(port);
 369         size = sizeof(sockaddr_in);
 370 #endif
 371         ret = bind(sockfd, server, size);
 372         delete[] server;
 373
 374         if (ret < 0)
 375         {
 376                 Log(DEBUG,"Bind fails it! %s", strerror(errno));
 377                 return false;
 378         }
 379         else
 380         {
 381                 if (listen(sockfd, Config->MaxConn) == -1)
 382                 {
 383                         this->Log(DEFAULT,"ERROR in listen(): %s",strerror(errno));
 384                         return false;
 385                 }
 386                 else
 387                 {
 388                         NonBlocking(sockfd);
 389                         return true;
 390                 }
 391         }
 392 }
 393
 394
 395 // Open a TCP Socket
 396 int irc::sockets::OpenTCPSocket(char* addr)
 397 {
 398         int sockfd;
 399         int on = 1;
 400         struct linger linger = { 0 };
 401 #ifdef IPV6
 402         printf("IPV6 ENABLED OPENTCPSOCKET\n");
 403         if (strchr(addr,':') || (!*addr))
 404         {
 405                 printf("IPV6 OPENTCPSOCKET DO\n");
 406                 sockfd = socket (PF_INET6, SOCK_STREAM, 0);
 407         }
 408         else
 409         {
 410                 printf("IPV6->IPV4 OPENTCPSOCKET DO\n");
 411                 sockfd = socket (PF_INET, SOCK_STREAM, 0);
 412         }
 413         if (sockfd < 0)
 414 #else
 415         if ((sockfd = socket (PF_INET, SOCK_STREAM, 0)) < 0)
 416 #endif
 417         {
 418                 printf("SOCKET FAIL: %s\n", strerror(errno));
 419                 return ERROR;
 420         }
 421         else
 422         {
 423                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 424                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
 425                 linger.l_onoff = 1;
 426                 linger.l_linger = 1;
 427                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &linger,sizeof(linger));
 428                 return (sockfd);
 429         }
 430 }
 431
 432 /* XXX: Probably belongs in class InspIRCd */
 433 bool InspIRCd::HasPort(int port, char* addr)
 434 {
 435         for (unsigned long count = 0; count < stats->BoundPortCount; count++)
 436         {
 437                 if ((port == Config->ports[count]) && (!strcasecmp(Config->addrs[count],addr)))
 438                 {
 439                         return true;
 440                 }
 441         }
 442         return false;
 443 }
 444
 445 /* XXX: Probably belongs in class InspIRCd */
 446 int InspIRCd::BindPorts(bool bail, int &ports_found, FailedPortList &failed_ports)
 447 {
 448         Log(DEBUG,"BINDING PORTS");
 449         char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF];
 450         insp_sockaddr client, server;
 451         int clientportcount = 0;
 452         int BoundPortCount = 0;
 453
 454         ports_found = 0;
 455
 456         int InitialPortCount = stats->BoundPortCount;
 457
 458         for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 459         {
 460                 Log(DEBUG,"FOUND PORT");
 461                 Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 462                 Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 463                 Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 464
 465                 if ((!*Type) || (!strcmp(Type,"clients")))
 466                 {
 467                         irc::portparser portrange(configToken, false);
 468                         long portno = -1;
 469                         while ((portno = portrange.GetToken()))
 470                         {
 471                                 if (!HasPort(portno, Addr))
 472                                 {
 473                                         ports_found++;
 474                                         Config->ports[clientportcount+InitialPortCount] = portno;
 475                                         if (*Addr == '*')
 476                                                 *Addr = 0;
 477
 478                                         strlcpy(Config->addrs[clientportcount+InitialPortCount],Addr,256);
 479                                         clientportcount++;
 480                                 }
 481                         }
 482                 }
 483
 484                 if (!bail)
 485                 {
 486                         int PortCount = clientportcount;
 487                         if (PortCount)
 488                         {
 489                                 BoundPortCount = stats->BoundPortCount;
 490                                 for (int count = InitialPortCount; count < InitialPortCount + PortCount; count++)
 491                                 {
 492                                         int fd = OpenTCPSocket(Config->addrs[count]);
 493                                         if (fd == ERROR)
 494                                         {
 495                                                 failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 496                                                 Log(DEBUG,"SOCKET FAIL");
 497                                         }
 498                                         else
 499                                         {
 500                                                 Log(DEBUG,"BIND");
 501                                                 Config->openSockfd[BoundPortCount] = new ListenSocket(this,fd,client,server,Config->ports[count],Config->addrs[count]);
 502                                                 if (Config->openSockfd[BoundPortCount]->GetFd() > -1)
 503                                                 {
 504                                                         if (!SE->AddFd(Config->openSockfd[BoundPortCount]))
 505                                                         {
 506                                                                 this->Log(DEFAULT,"ERK! Failed to add listening port to socket engine!");
 507                                                                 shutdown(Config->openSockfd[BoundPortCount]->GetFd(),2);
 508                                                                 close(Config->openSockfd[BoundPortCount]->GetFd());
 509                                                                 delete Config->openSockfd[BoundPortCount];
 510                                                                 failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 511                                                         }
 512                                                         else
 513                                                                 BoundPortCount++;
 514                                                 }
 515                                         }
 516                                 }
 517                                 return InitialPortCount + BoundPortCount;
 518                         }
 519                         return InitialPortCount;
 520                 }
 521         }
 522
 523         int PortCount = clientportcount;
 524
 525         for (int count = 0; count < PortCount; count++)
 526         {
 527                 int fd = OpenTCPSocket(Config->addrs[count]);
 528                 if (fd == ERROR)
 529                 {
 530                         Log(DEBUG,"SOCKET FAIL");
 531                         failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 532                 }
 533                 else
 534                 {
 535                         Log(DEBUG,"BIND");
 536                         Config->openSockfd[BoundPortCount] = new ListenSocket(this,fd,client,server,Config->ports[count],Config->addrs[count]);
 537                         if (Config->openSockfd[BoundPortCount]->GetFd() > -1)
 538                         {
 539                                 BoundPortCount++;
 540                         }
 541                         else
 542                                 failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 543                 }
 544         }
 545         return BoundPortCount;
 546 }
 547
 548 const char* irc::sockets::insp_ntoa(insp_inaddr n)
 549 {
 550         static char buf[1024];
 551         inet_ntop(AF_FAMILY, &n, buf, sizeof(buf));
 552         return buf;
 553 }
 554
 555 int irc::sockets::insp_aton(const char* a, insp_inaddr* n)
 556 {
 557         return inet_pton(AF_FAMILY, a, n);
 558 }
 559