src/socket.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                     E-mail:
   7  *              <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *          the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 #include <string>
  18 #include "configreader.h"
  19 #include "socket.h"
  20 #include "inspircd.h"
  21 #include "socketengine.h"
  22 #include "wildcard.h"
  23
  24 using namespace std;
  25 using namespace irc::sockets;
  26
  27 /* Used when comparing CIDR masks for the modulus bits left over.
  28  * A lot of ircd's seem to do this:
  29  * ((-1) << (8 - (mask % 8)))
  30  * But imho, it sucks in comparison to a nice neat lookup table.
  31  */
  32 const char inverted_bits[8] = { 0x00, /* 00000000 - 0 bits - never actually used */
  33                                 0x80, /* 10000000 - 1 bits */
  34                                 0xC0, /* 11000000 - 2 bits */
  35                                 0xE0, /* 11100000 - 3 bits */
  36                                 0xF0, /* 11110000 - 4 bits */
  37                                 0xF8, /* 11111000 - 5 bits */
  38                                 0xFC, /* 11111100 - 6 bits */
  39                                 0xFE  /* 11111110 - 7 bits */
  40 };
  41
  42
  43 ListenSocket::ListenSocket(InspIRCd* Instance, int sockfd, insp_sockaddr client, insp_sockaddr server, int port, char* addr) : ServerInstance(Instance)
  44 {
  45         this->SetFd(sockfd);
  46         Instance->Log(DEBUG,"Binding to port %s:%d",addr,port);
  47         if (!Instance->BindSocket(this->fd,client,server,port,addr))
  48         {
  49                 Instance->Log(DEBUG,"Binding failed!");
  50                 this->fd = -1;
  51         }
  52 }
  53
  54 void ListenSocket::HandleEvent(EventType et, int errornum)
  55 {
  56         insp_sockaddr sock_us;  // our port number
  57         socklen_t uslen;        // length of our port number
  58         insp_sockaddr client;
  59         socklen_t length;
  60         int incomingSockfd, in_port;
  61
  62         ServerInstance->Log(DEBUG,"Handle ListenSocket event");
  63
  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                 ServerInstance->Log(DEBUG,"Accepted socket %d",incomingSockfd);
  76                 NonBlocking(incomingSockfd);
  77                 if (ServerInstance->Config->GetIOHook(in_port))
  78                 {
  79                         try
  80                         {
  81 #ifdef IPV6
  82                                 ServerInstance->Config->GetIOHook(in_port)->OnRawSocketAccept(incomingSockfd, insp_ntoa(client.sin6_addr), in_port);
  83 #else
  84                                 ServerInstance->Config->GetIOHook(in_port)->OnRawSocketAccept(incomingSockfd, insp_ntoa(client.sin_addr), in_port);
  85 #endif
  86                         }
  87                         catch (ModuleException& modexcept)
  88                         {
  89                                 ServerInstance->Log(DEBUG,"Module exception cought: %s",modexcept.GetReason());
  90                         }
  91                 }
  92                 ServerInstance->stats->statsAccept++;
  93 #ifdef IPV6
  94                 ServerInstance->Log(DEBUG,"Add ipv6 client");
  95                 userrec::AddClient(ServerInstance, incomingSockfd, in_port, false, client.sin6_addr);
  96 #else
  97                 ServerInstance->Log(DEBUG,"Add ipv4 client");
  98                 userrec::AddClient(ServerInstance, incomingSockfd, in_port, false, client.sin_addr);
  99 #endif
 100                 ServerInstance->Log(DEBUG,"Adding client on port %d fd=%d",in_port,incomingSockfd);
 101         }
 102         else
 103         {
 104                 ServerInstance->Log(DEBUG,"Accept failed on fd %d: %s",incomingSockfd,strerror(errno));
 105                 shutdown(incomingSockfd,2);
 106                 close(incomingSockfd);
 107                 ServerInstance->stats->statsRefused++;
 108         }
 109 }
 110
 111 /* Match raw bytes using CIDR bit matching, used by higher level MatchCIDR() */
 112 bool irc::sockets::MatchCIDRBits(unsigned char* address, unsigned char* mask, unsigned int mask_bits)
 113 {
 114         unsigned int modulus = mask_bits % 8; /* Number of whole bytes in the mask */
 115         unsigned int divisor = mask_bits / 8; /* Remaining bits in the mask after whole bytes are dealt with */
 116
 117         /* First compare the whole bytes, if they dont match, return false */
 118         if (memcmp(address, mask, divisor))
 119                 return false;
 120
 121         /* Now if there are any remainder bits, we compare them with logic AND */
 122         if (modulus)
 123                 if ((address[divisor] & inverted_bits[modulus]) != (mask[divisor] & inverted_bits[modulus]))
 124                         /* If they dont match, return false */
 125                         return false;
 126
 127         /* The address matches the mask, to mask_bits bits of mask */
 128         return true;
 129 }
 130
 131 /* Match CIDR, but dont attempt to match() against leading *!*@ sections */
 132 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask)
 133 {
 134         return MatchCIDR(address, cidr_mask, false);
 135 }
 136
 137 /* 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
 138  * If you have a lot of hosts to match, youre probably better off building your mask once
 139  * and then using the lower level MatchCIDRBits directly.
 140  *
 141  * This will also attempt to match any leading usernames or nicknames on the mask, using
 142  * match(), when match_with_username is true.
 143  */
 144 bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask, bool match_with_username)
 145 {
 146         unsigned char addr_raw[16];
 147         unsigned char mask_raw[16];
 148         unsigned int bits = 0;
 149         char* mask = NULL;
 150
 151         /* The caller is trying to match ident@<mask>/bits.
 152          * Chop off the ident@ portion, use match() on it
 153          * seperately.
 154          */
 155         if (match_with_username)
 156         {
 157                 /* Duplicate the strings, and try to find the position
 158                  * of the @ symbol in each */
 159                 char* address_dupe = strdup(address);
 160                 char* cidr_dupe = strdup(cidr_mask);
 161
 162                 /* Use strchr not strrchr, because its going to be nearer to the left */
 163                 char* username_mask_pos = strrchr(cidr_dupe, '@');
 164                 char* username_addr_pos = strrchr(address_dupe, '@');
 165
 166                 /* Both strings have an @ symbol in them */
 167                 if (username_mask_pos && username_addr_pos)
 168                 {
 169                         /* Zero out the location of the @ symbol */
 170                         *username_mask_pos = *username_addr_pos = 0;
 171
 172                         /* Try and match() the strings before the @
 173                          * symbols, and recursively call MatchCIDR without
 174                          * username matching enabled to match the host part.
 175                          */
 176                         bool result = (match(address_dupe, cidr_dupe) && MatchCIDR(username_addr_pos + 1, username_mask_pos + 1, false));
 177
 178                         /* Free the stuff we created */
 179                         free(address_dupe);
 180                         free(cidr_dupe);
 181
 182                         /* Return a result */
 183                         return result;
 184                 }
 185                 else
 186                 {
 187                         /* One or both didnt have an @ in,
 188                          * just match as CIDR
 189                          */
 190                         free(address_dupe);
 191                         free(cidr_dupe);
 192                         mask = strdup(cidr_mask);
 193                 }
 194         }
 195         else
 196         {
 197                 /* Make a copy of the cidr mask string,
 198                  * we're going to change it
 199                  */
 200                 mask = strdup(cidr_mask);
 201         }
 202
 203         in_addr  address_in4;
 204         in_addr  mask_in4;
 205
 206
 207         /* Use strrchr for this, its nearer to the right */
 208         char* bits_chars = strrchr(mask,'/');
 209
 210         if (bits_chars)
 211         {
 212                 bits = atoi(bits_chars + 1);
 213                 *bits_chars = 0;
 214         }
 215         else
 216         {
 217                 /* No 'number of bits' field! */
 218                 free(mask);
 219                 return false;
 220         }
 221
 222 #ifdef SUPPORT_IP6LINKS
 223         in6_addr address_in6;
 224         in6_addr mask_in6;
 225
 226         if (inet_pton(AF_INET6, address, &address_in6) > 0)
 227         {
 228                 if (inet_pton(AF_INET6, mask, &mask_in6) > 0)
 229                 {
 230                         memcpy(&addr_raw, &address_in6.s6_addr, 16);
 231                         memcpy(&mask_raw, &mask_in6.s6_addr, 16);
 232
 233                         if (bits > 128)
 234                                 bits = 128;
 235                 }
 236                 else
 237                 {
 238                         /* The address was valid ipv6, but the mask
 239                          * that goes with it wasnt.
 240                          */
 241                         free(mask);
 242                         return false;
 243                 }
 244         }
 245         else
 246 #endif
 247         if (inet_pton(AF_INET, address, &address_in4) > 0)
 248         {
 249                 if (inet_pton(AF_INET, mask, &mask_in4) > 0)
 250                 {
 251                         memcpy(&addr_raw, &address_in4.s_addr, 4);
 252                         memcpy(&mask_raw, &mask_in4.s_addr, 4);
 253
 254                         if (bits > 32)
 255                                 bits = 32;
 256                 }
 257                 else
 258                 {
 259                         /* The address was valid ipv4,
 260                          * but the mask that went with it wasnt.
 261                          */
 262                         free(mask);
 263                         return false;
 264                 }
 265         }
 266         else
 267         {
 268                 /* The address was neither ipv4 or ipv6 */
 269                 free(mask);
 270                 return false;
 271         }
 272
 273         /* Low-level-match the bits in the raw data */
 274         free(mask);
 275         return MatchCIDRBits(addr_raw, mask_raw, bits);
 276 }
 277
 278 inline void irc::sockets::Blocking(int s)
 279 {
 280         int flags = fcntl(s, F_GETFL, 0);
 281         fcntl(s, F_SETFL, flags ^ O_NONBLOCK);
 282 }
 283
 284 inline void irc::sockets::NonBlocking(int s)
 285 {
 286         int flags = fcntl(s, F_GETFL, 0);
 287         fcntl(s, F_SETFL, flags | O_NONBLOCK);
 288 }
 289
 290
 291 /** This will bind a socket to a port. It works for UDP/TCP.
 292  * It can only bind to IP addresses, if you wish to bind to hostnames
 293  * you should first resolve them using class 'Resolver'.
 294  */
 295 bool InspIRCd::BindSocket(int sockfd, insp_sockaddr client, insp_sockaddr server, int port, char* addr)
 296 {
 297         memset(&server,0,sizeof(server));
 298         insp_inaddr addy;
 299
 300         if (*addr == '*')
 301                 *addr = 0;
 302
 303         if ((*addr) && (insp_aton(addr,&addy) < 1))
 304         {
 305                 this->Log(DEBUG,"Invalid IP '%s' given to BindSocket()", addr);
 306                 return false;;
 307         }
 308
 309 #ifdef IPV6
 310         server.sin6_family = AF_FAMILY;
 311 #else
 312         server.sin_family = AF_FAMILY;
 313 #endif
 314         if (!*addr)
 315         {
 316 #ifdef IPV6
 317                 memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
 318 #else
 319                 server.sin_addr.s_addr = htonl(INADDR_ANY);
 320 #endif
 321         }
 322         else
 323         {
 324 #ifdef IPV6
 325                 memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
 326 #else
 327                 server.sin_addr = addy;
 328 #endif
 329         }
 330 #ifdef IPV6
 331         server.sin6_port = htons(port);
 332 #else
 333         server.sin_port = htons(port);
 334 #endif
 335         if (bind(sockfd,(struct sockaddr*)&server,sizeof(server)) < 0)
 336         {
 337                 return false;
 338         }
 339         else
 340         {
 341                 this->Log(DEBUG,"Bound port %s:%d",*addr ? addr : "*",port);
 342                 if (listen(sockfd, Config->MaxConn) == -1)
 343                 {
 344                         this->Log(DEFAULT,"ERROR in listen(): %s",strerror(errno));
 345                         return false;
 346                 }
 347                 else
 348                 {
 349                         NonBlocking(sockfd);
 350                         return true;
 351                 }
 352         }
 353 }
 354
 355
 356 // Open a TCP Socket
 357 int irc::sockets::OpenTCPSocket()
 358 {
 359         int sockfd;
 360         int on = 1;
 361         struct linger linger = { 0 };
 362
 363         if ((sockfd = socket (AF_FAMILY, SOCK_STREAM, 0)) < 0)
 364         {
 365                 return ERROR;
 366         }
 367         else
 368         {
 369                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 370                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
 371                 linger.l_onoff = 1;
 372                 linger.l_linger = 1;
 373                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &linger,sizeof(linger));
 374                 return (sockfd);
 375         }
 376 }
 377
 378 /* XXX: Probably belongs in class InspIRCd */
 379 bool InspIRCd::HasPort(int port, char* addr)
 380 {
 381         for (unsigned long count = 0; count < stats->BoundPortCount; count++)
 382         {
 383                 if ((port == Config->ports[count]) && (!strcasecmp(Config->addrs[count],addr)))
 384                 {
 385                         return true;
 386                 }
 387         }
 388         return false;
 389 }
 390
 391 /* XXX: Probably belongs in class InspIRCd */
 392 int InspIRCd::BindPorts(bool bail, int &ports_found, FailedPortList &failed_ports)
 393 {
 394         char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF];
 395         insp_sockaddr client, server;
 396         int clientportcount = 0;
 397         int BoundPortCount = 0;
 398
 399         ports_found = 0;
 400
 401         int InitialPortCount = stats->BoundPortCount;
 402         this->Log(DEBUG,"Initial port count: %d",InitialPortCount);
 403
 404         for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 405         {
 406                 Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 407                 Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 408                 Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 409
 410                 if ((!*Type) || (!strcmp(Type,"clients")))
 411                 {
 412                         irc::portparser portrange(configToken, false);
 413                         long portno = -1;
 414                         while ((portno = portrange.GetToken()))
 415                         {
 416                                 if (!HasPort(portno, Addr))
 417                                 {
 418                                         ports_found++;
 419                                         Config->ports[clientportcount+InitialPortCount] = portno;
 420                                         if (*Addr == '*')
 421                                                 *Addr = 0;
 422
 423                                         strlcpy(Config->addrs[clientportcount+InitialPortCount],Addr,256);
 424                                         clientportcount++;
 425                                         this->Log(DEBUG,"NEW binding %s:%d [%s] from config",Addr, portno, Type);
 426                                 }
 427                         }
 428                 }
 429
 430                 if (!bail)
 431                 {
 432                         int PortCount = clientportcount;
 433                         if (PortCount)
 434                         {
 435                                 BoundPortCount = stats->BoundPortCount;
 436                                 for (int count = InitialPortCount; count < InitialPortCount + PortCount; count++)
 437                                 {
 438                                         int fd = OpenTCPSocket();
 439                                         if (fd == ERROR)
 440                                         {
 441                                                 this->Log(DEBUG,"Bad fd %d binding port [%s:%d]",fd,Config->addrs[count],Config->ports[count]);
 442                                                 failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 443                                         }
 444                                         else
 445                                         {
 446                                                 Config->openSockfd[BoundPortCount] = new ListenSocket(this,fd,client,server,Config->ports[count],Config->addrs[count]);
 447                                                 if (Config->openSockfd[BoundPortCount]->GetFd() > -1)
 448                                                 {
 449                                                         if (!SE->AddFd(Config->openSockfd[BoundPortCount]))
 450                                                         {
 451                                                                 this->Log(DEFAULT,"ERK! Failed to add listening port to socket engine!");
 452                                                                 shutdown(Config->openSockfd[BoundPortCount]->GetFd(),2);
 453                                                                 close(Config->openSockfd[BoundPortCount]->GetFd());
 454                                                                 delete Config->openSockfd[BoundPortCount];
 455                                                                 failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 456                                                         }
 457                                                         else
 458                                                                 BoundPortCount++;
 459                                                 }
 460                                         }
 461                                 }
 462                                 return InitialPortCount + BoundPortCount;
 463                         }
 464                         else
 465                         {
 466                                 this->Log(DEBUG,"There is nothing new to bind!");
 467                         }
 468                         return InitialPortCount;
 469                 }
 470         }
 471
 472         int PortCount = clientportcount;
 473
 474         for (int count = 0; count < PortCount; count++)
 475         {
 476                 int fd = OpenTCPSocket();
 477                 if (fd == ERROR)
 478                 {
 479                         this->Log(DEBUG,"Bad fd %d binding port [%s:%d]",fd,Config->addrs[count],Config->ports[count]);
 480                         failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 481                 }
 482                 else
 483                 {
 484                         Config->openSockfd[BoundPortCount] = new ListenSocket(this,fd,client,server,Config->ports[count],Config->addrs[count]);
 485                         if (Config->openSockfd[BoundPortCount]->GetFd() > -1)
 486                         {
 487                                 BoundPortCount++;
 488                         }
 489                         else
 490                                 failed_ports.push_back(std::make_pair(Config->addrs[count],Config->ports[count]));
 491                 }
 492         }
 493         return BoundPortCount;
 494 }
 495
 496 const char* irc::sockets::insp_ntoa(insp_inaddr n)
 497 {
 498         static char buf[1024];
 499         inet_ntop(AF_FAMILY, &n, buf, sizeof(buf));
 500         return buf;
 501 }
 502
 503 int irc::sockets::insp_aton(const char* a, insp_inaddr* n)
 504 {
 505         return inet_pton(AF_FAMILY, a, n);
 506 }
 507