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 #ifdef IPV6
  46         if ((!*addr) || (strchr(addr,':')))
  47                 this->family = AF_INET6;
  48         else
  49                 this->family = AF_INET;
  50 #else
  51         this->family = AF_INET;
  52 #endif
  53 }
  54
  55 ListenSocket::~ListenSocket()
  56 {
  57         if (this->GetFd() > -1)
  58         {
  59                 shutdown(this->fd, 2);
  60                 close(this->fd);
  61                 this->fd = -1;
  62         }
  63 }
  64
  65 void ListenSocket::HandleEvent(EventType et, int errornum)
  66 {
  67         sockaddr* sock_us = new sockaddr[2];    // our port number
  68         sockaddr* client = new sockaddr[2];
  69         socklen_t uslen, length;                // length of our port number
  70         int incomingSockfd, in_port;
  71
  72 #ifdef IPV6
  73         if (this->family == AF_INET6)
  74         {
  75                 uslen = sizeof(sockaddr_in6);
  76                 length = sizeof(sockaddr_in6);
  77         }
  78         else
  79         {
  80                 uslen = sizeof(sockaddr_in);
  81                 length = sizeof(sockaddr_in);
  82         }
  83 #else
  84         uslen = sizeof(sockaddr_in);
  85         length = sizeof(sockaddr_in);
  86 #endif
  87         incomingSockfd = accept (this->GetFd(), (sockaddr*)client, &length);
  88
  89         if ((incomingSockfd > -1) && (!getsockname(incomingSockfd, sock_us, &uslen)))
  90         {
  91                 char buf[MAXBUF];
  92 #ifdef IPV6
  93                 if (this->family == AF_INET6)
  94                 {
  95                         inet_ntop(AF_INET6, &((const sockaddr_in6*)client)->sin6_addr, buf, sizeof(buf));
  96                         in_port = ntohs(((sockaddr_in6*)sock_us)->sin6_port);
  97                 }
  98                 else
  99                 {
 100                         inet_ntop(AF_INET, &((const sockaddr_in*)client)->sin_addr, buf, sizeof(buf));
 101                         in_port = ntohs(((sockaddr_in*)sock_us)->sin_port);
 102                 }
 103 #else
 104                 inet_ntop(AF_INET, &((const sockaddr_in*)client)->sin_addr, buf, sizeof(buf));
 105                 in_port = ntohs(((sockaddr_in*)sock_us)->sin_port);
 106 #endif
 107                 NonBlocking(incomingSockfd);
 108                 if (ServerInstance->Config->GetIOHook(in_port))
 109                 {
 110                         try
 111                         {
 112                                 ServerInstance->Config->GetIOHook(in_port)->OnRawSocketAccept(incomingSockfd, buf, in_port);
 113                         }
 114                         catch (CoreException& modexcept)
 115                         {
 116                                 ServerInstance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 117                         }
 118                 }
 119                 ServerInstance->stats->statsAccept++;
 120                 userrec::AddClient(ServerInstance, incomingSockfd, in_port, false, this->family, client);
 121         }
 122         else
 123         {
 124                 shutdown(incomingSockfd,2);
 125                 close(incomingSockfd);
 126                 ServerInstance->stats->statsRefused++;
 127         }
 128         delete[] client;
 129         delete[] sock_us;
 130 }
 131
 132 /* Match raw bytes using CIDR bit matching, used by higher level MatchCIDR() */
 133 bool irc::sockets::MatchCIDRBits(unsigned char* address, unsigned char* mask, unsigned int mask_bits)
 134 {
 135         unsigned int modulus = mask_bits % 8; /* Number of whole bytes in the mask */
 136         unsigned int divisor = mask_bits / 8; /* Remaining bits in the mask after whole bytes are dealt with */
 137
 138         /* First compare the whole bytes, if they dont match, return false */
 139         if (memcmp(address, mask, divisor))
 140                 return false;
 141
 142         /* Now if there are any remainder bits, we compare them with logic AND */
 143         if (modulus)
 144                 if ((address[divisor] & inverted_bits[modulus]) != (mask[divisor] & inverted_bits[modulus]))
 145                         /* If they dont match, return false */
 146                         return false;
 147
 148         /* The address matches the mask, to mask_bits bits of mask */
 149         return true;
 150 }
 151
 152 /* Match CIDR, but dont attempt to match() against leading *!*@ sections */
 153 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask)
 154 {
 155         return MatchCIDR(address, cidr_mask, false);
 156 }
 157
 158 /* 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
 159  * If you have a lot of hosts to match, youre probably better off building your mask once
 160  * and then using the lower level MatchCIDRBits directly.
 161  *
 162  * This will also attempt to match any leading usernames or nicknames on the mask, using
 163  * match(), when match_with_username is true.
 164  */
 165 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask, bool match_with_username)
 166 {
 167         unsigned char addr_raw[16];
 168         unsigned char mask_raw[16];
 169         unsigned int bits = 0;
 170         char* mask = NULL;
 171
 172         /* The caller is trying to match ident@<mask>/bits.
 173          * Chop off the ident@ portion, use match() on it
 174          * seperately.
 175          */
 176         if (match_with_username)
 177         {
 178                 /* Duplicate the strings, and try to find the position
 179                  * of the @ symbol in each */
 180                 char* address_dupe = strdup(address);
 181                 char* cidr_dupe = strdup(cidr_mask);
 182
 183                 /* Use strchr not strrchr, because its going to be nearer to the left */
 184                 char* username_mask_pos = strrchr(cidr_dupe, '@');
 185                 char* username_addr_pos = strrchr(address_dupe, '@');
 186
 187                 /* Both strings have an @ symbol in them */
 188                 if (username_mask_pos && username_addr_pos)
 189                 {
 190                         /* Zero out the location of the @ symbol */
 191                         *username_mask_pos = *username_addr_pos = 0;
 192
 193                         /* Try and match() the strings before the @
 194                          * symbols, and recursively call MatchCIDR without
 195                          * username matching enabled to match the host part.
 196                          */
 197                         bool result = (match(address_dupe, cidr_dupe) && MatchCIDR(username_addr_pos + 1, username_mask_pos + 1, false));
 198
 199                         /* Free the stuff we created */
 200                         free(address_dupe);
 201                         free(cidr_dupe);
 202
 203                         /* Return a result */
 204                         return result;
 205                 }
 206                 else
 207                 {
 208                         /* One or both didnt have an @ in,
 209                          * just match as CIDR
 210                          */
 211                         free(address_dupe);
 212                         free(cidr_dupe);
 213                         mask = strdup(cidr_mask);
 214                 }
 215         }
 216         else
 217         {
 218                 /* Make a copy of the cidr mask string,
 219                  * we're going to change it
 220                  */
 221                 mask = strdup(cidr_mask);
 222         }
 223
 224         in_addr  address_in4;
 225         in_addr  mask_in4;
 226
 227
 228         /* Use strrchr for this, its nearer to the right */
 229         char* bits_chars = strrchr(mask,'/');
 230
 231         if (bits_chars)
 232         {
 233                 bits = atoi(bits_chars + 1);
 234                 *bits_chars = 0;
 235         }
 236         else
 237         {
 238                 /* No 'number of bits' field! */
 239                 free(mask);
 240                 return false;
 241         }
 242
 243 #ifdef SUPPORT_IP6LINKS
 244         in6_addr address_in6;
 245         in6_addr mask_in6;
 246
 247         if (inet_pton(AF_INET6, address, &address_in6) > 0)
 248         {
 249                 if (inet_pton(AF_INET6, mask, &mask_in6) > 0)
 250                 {
 251                         memcpy(&addr_raw, &address_in6.s6_addr, 16);
 252                         memcpy(&mask_raw, &mask_in6.s6_addr, 16);
 253
 254                         if (bits > 128)
 255                                 bits = 128;
 256                 }
 257                 else
 258                 {
 259                         /* The address was valid ipv6, but the mask
 260                          * that goes with it wasnt.
 261                          */
 262                         free(mask);
 263                         return false;
 264                 }
 265         }
 266         else
 267 #endif
 268         if (inet_pton(AF_INET, address, &address_in4) > 0)
 269         {
 270                 if (inet_pton(AF_INET, mask, &mask_in4) > 0)
 271                 {
 272                         memcpy(&addr_raw, &address_in4.s_addr, 4);
 273                         memcpy(&mask_raw, &mask_in4.s_addr, 4);
 274
 275                         if (bits > 32)
 276                                 bits = 32;
 277                 }
 278                 else
 279                 {
 280                         /* The address was valid ipv4,
 281                          * but the mask that went with it wasnt.
 282                          */
 283                         free(mask);
 284                         return false;
 285                 }
 286         }
 287         else
 288         {
 289                 /* The address was neither ipv4 or ipv6 */
 290                 free(mask);
 291                 return false;
 292         }
 293
 294         /* Low-level-match the bits in the raw data */
 295         free(mask);
 296         return MatchCIDRBits(addr_raw, mask_raw, bits);
 297 }
 298
 299 void irc::sockets::Blocking(int s)
 300 {
 301         int flags = fcntl(s, F_GETFL, 0);
 302         fcntl(s, F_SETFL, flags ^ O_NONBLOCK);
 303 }
 304
 305 void irc::sockets::NonBlocking(int s)
 306 {
 307         int flags = fcntl(s, F_GETFL, 0);
 308         fcntl(s, F_SETFL, flags | O_NONBLOCK);
 309 }
 310
 311 /** This will bind a socket to a port. It works for UDP/TCP.
 312  * It can only bind to IP addresses, if you wish to bind to hostnames
 313  * you should first resolve them using class 'Resolver'.
 314  */
 315 bool InspIRCd::BindSocket(int sockfd, insp_sockaddr clientn, insp_sockaddr servern, int port, char* addr)
 316 {
 317         /* We allocate 2 of these, because sockaddr_in6 is larger than sockaddr (ugh, hax) */
 318         sockaddr* server = new sockaddr[2];
 319         memset(server,0,sizeof(sockaddr)*2);
 320
 321         int ret, size;
 322
 323         if (*addr == '*')
 324                 *addr = 0;
 325
 326 #ifdef IPV6
 327         if (*addr)
 328         {
 329                 printf("Address %s not empty\n", addr);
 330                 /* There is an address here. Is it ipv6? */
 331                 if (strchr(addr,':'))
 332                 {
 333                         printf("Address %s is ipv6\n", addr);
 334                         /* Yes it is */
 335                         in6_addr addy;
 336                         if (inet_pton(AF_INET6, addr, &addy) < 1)
 337                         {
 338                                 printf("Failed to interpret address %s", addr);
 339                                 delete[] server;
 340                                 return false;
 341                         }
 342
 343                         ((sockaddr_in6*)server)->sin6_family = AF_INET6;
 344                         memcpy(&(((sockaddr_in6*)server)->sin6_addr), &addy, sizeof(in6_addr));
 345                         ((sockaddr_in6*)server)->sin6_port = htons(port);
 346                         size = sizeof(sockaddr_in6);
 347                 }
 348                 else
 349                 {
 350                         /* No, its not */
 351                         printf("Address %s is ipv4\n", addr);
 352                         in_addr addy;
 353                         if (inet_pton(AF_INET, addr, &addy) < 1)
 354                         {
 355                                 delete[] server;
 356                                 return false;
 357                         }
 358
 359                         ((sockaddr_in*)server)->sin_family = AF_INET;
 360                         ((sockaddr_in*)server)->sin_addr = addy;
 361                         ((sockaddr_in*)server)->sin_port = htons(port);
 362                         size = sizeof(sockaddr_in);
 363                 }
 364         }
 365         else
 366         {
 367                 printf("Address empty\n");
 368                 /* Theres no address here, default to ipv6 bind to all */
 369                 ((sockaddr_in6*)server)->sin6_family = AF_INET6;
 370                 memset(&(((sockaddr_in6*)server)->sin6_addr), 0, sizeof(in6_addr));
 371                 ((sockaddr_in6*)server)->sin6_port = htons(port);
 372                 size = sizeof(sockaddr_in6);
 373         }
 374 #else
 375         /* If we aren't built with ipv6, the choice becomes simple */
 376         ((sockaddr_in*)server)->sin_family = AF_INET;
 377         if (*addr)
 378         {
 379                 /* There is an address here. */
 380                 in_addr addy;
 381                 if (inet_pton(AF_INET, addr, &addy) < 1)
 382                 {
 383                         delete[] server;
 384                         return false;
 385                 }
 386                 ((sockaddr_in*)server)->sin_addr = addy;
 387         }
 388         else
 389         {
 390                 /* Bind ipv4 to all */
 391                 ((sockaddr_in*)server)->sin_addr.s_addr = htonl(INADDR_ANY);
 392         }
 393         /* Bind ipv4 port number */
 394         ((sockaddr_in*)server)->sin_port = htons(port);
 395         size = sizeof(sockaddr_in);
 396 #endif
 397         ret = bind(sockfd, server, size);
 398         delete[] server;
 399
 400         if (ret < 0)
 401         {
 402                 Log(DEBUG,"Bind fails it! %s", strerror(errno));
 403                 return false;
 404         }
 405         else
 406         {
 407                 if (listen(sockfd, Config->MaxConn) == -1)
 408                 {
 409                         this->Log(DEFAULT,"ERROR in listen(): %s",strerror(errno));
 410                         return false;
 411                 }
 412                 else
 413                 {
 414                         NonBlocking(sockfd);
 415                         return true;
 416                 }
 417         }
 418 }
 419
 420
 421 // Open a TCP Socket
 422 int irc::sockets::OpenTCPSocket(char* addr)
 423 {
 424         int sockfd;
 425         int on = 1;
 426         struct linger linger = { 0 };
 427 #ifdef IPV6
 428         printf("IPV6 ENABLED OPENTCPSOCKET\n");
 429         if (strchr(addr,':') || (!*addr))
 430         {
 431                 printf("IPV6 OPENTCPSOCKET DO\n");
 432                 sockfd = socket (PF_INET6, SOCK_STREAM, 0);
 433         }
 434         else
 435         {
 436                 printf("IPV6->IPV4 OPENTCPSOCKET DO\n");
 437                 sockfd = socket (PF_INET, SOCK_STREAM, 0);
 438         }
 439         if (sockfd < 0)
 440 #else
 441         if ((sockfd = socket (PF_INET, SOCK_STREAM, 0)) < 0)
 442 #endif
 443         {
 444                 printf("SOCKET FAIL: %s\n", strerror(errno));
 445                 return ERROR;
 446         }
 447         else
 448         {
 449                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 450                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
 451                 linger.l_onoff = 1;
 452                 linger.l_linger = 1;
 453                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &linger,sizeof(linger));
 454                 return (sockfd);
 455         }
 456 }
 457
 458 /* XXX: Probably belongs in class InspIRCd */
 459 bool InspIRCd::HasPort(int port, char* addr)
 460 {
 461         for (unsigned long count = 0; count < stats->BoundPortCount; count++)
 462         {
 463                 if ((port == Config->ports[count]) && (!strcasecmp(Config->addrs[count],addr)))
 464                 {
 465                         return true;
 466                 }
 467         }
 468         return false;
 469 }
 470
 471 /* XXX: Probably belongs in class InspIRCd */
 472 int InspIRCd::BindPorts(bool bail, int &ports_found, FailedPortList &failed_ports)
 473 {
 474         Log(DEBUG,"BINDING PORTS");
 475         char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF];
 476         insp_sockaddr client, server;
 477         int clientportcount = 0;
 478         int BoundPortCount = 0;
 479
 480         ports_found = 0;
 481
 482         int InitialPortCount = stats->BoundPortCount;
 483
 484         for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 485         {
 486                 Log(DEBUG,"FOUND PORT");
 487                 Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 488                 Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 489                 Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 490
 491                 if ((!*Type) || (!strcmp(Type,"clients")))
 492                 {
 493                         irc::portparser portrange(configToken, false);
 494                         long portno = -1;
 495                         while ((portno = portrange.GetToken()))
 496                         {
 497                                 if (!HasPort(portno, Addr))
 498                                 {
 499                                         ports_found++;
 500                                         Config->ports[clientportcount+InitialPortCount] = portno;
 501                                         if (*Addr == '*')
 502                                                 *Addr = 0;
 503
 504                                         strlcpy(Config->addrs[clientportcount+InitialPortCount],Addr,256);
 505                                         clientportcount++;
 506                                 }
 507                         }
 508                 }
 509
 510                 if (!bail)
 511                 {
 512                         int PortCount = clientportcount;
 513                         if (PortCount)
 514                         {
 515                                 BoundPortCount = stats->BoundPortCount;
 516                                 for (int count = InitialPortCount; count < InitialPortCount + PortCount; count++)
 517                                 {
 518                                         int fd = OpenTCPSocket(Config->addrs[count]);
 519                                         if (fd == ERROR)
 520                                         {
 521                                                 failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 522                                                 Log(DEBUG,"SOCKET FAIL");
 523                                         }
 524                                         else
 525                                         {
 526                                                 Log(DEBUG,"BIND");
 527                                                 Config->openSockfd[BoundPortCount] = new ListenSocket(this,fd,client,server,Config->ports[count],Config->addrs[count]);
 528                                                 if (Config->openSockfd[BoundPortCount]->GetFd() > -1)
 529                                                 {
 530                                                         if (!SE->AddFd(Config->openSockfd[BoundPortCount]))
 531                                                         {
 532                                                                 this->Log(DEFAULT,"ERK! Failed to add listening port to socket engine!");
 533                                                                 shutdown(Config->openSockfd[BoundPortCount]->GetFd(),2);
 534                                                                 close(Config->openSockfd[BoundPortCount]->GetFd());
 535                                                                 delete Config->openSockfd[BoundPortCount];
 536                                                                 failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 537                                                         }
 538                                                         else
 539                                                                 BoundPortCount++;
 540                                                 }
 541                                         }
 542                                 }
 543                                 return InitialPortCount + BoundPortCount;
 544                         }
 545                         return InitialPortCount;
 546                 }
 547         }
 548
 549         int PortCount = clientportcount;
 550
 551         for (int count = 0; count < PortCount; count++)
 552         {
 553                 int fd = OpenTCPSocket(Config->addrs[count]);
 554                 if (fd == ERROR)
 555                 {
 556                         Log(DEBUG,"SOCKET FAIL");
 557                         failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 558                 }
 559                 else
 560                 {
 561                         Log(DEBUG,"BIND");
 562                         Config->openSockfd[BoundPortCount] = new ListenSocket(this,fd,client,server,Config->ports[count],Config->addrs[count]);
 563                         if (Config->openSockfd[BoundPortCount]->GetFd() > -1)
 564                         {
 565                                 BoundPortCount++;
 566                         }
 567                         else
 568                                 failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 569                 }
 570         }
 571         return BoundPortCount;
 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