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)
  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                 return false;
 219         }
 220
 221 #ifdef SUPPORT_IP6LINKS
 222         in6_addr address_in6;
 223         in6_addr mask_in6;
 224
 225         if (inet_pton(AF_INET6, address, &address_in6) > 0)
 226         {
 227                 if (inet_pton(AF_INET6, mask, &mask_in6) > 0)
 228                 {
 229                         memcpy(&addr_raw, &address_in6.s6_addr, 16);
 230                         memcpy(&mask_raw, &mask_in6.s6_addr, 16);
 231
 232                         if (bits > 128)
 233                                 bits = 128;
 234                 }
 235                 else
 236                 {
 237                         /* The address was valid ipv6, but the mask
 238                          * that goes with it wasnt.
 239                          */
 240                         free(mask);
 241                         return false;
 242                 }
 243         }
 244         else
 245 #endif
 246         if (inet_pton(AF_INET, address, &address_in4) > 0)
 247         {
 248                 if (inet_pton(AF_INET, mask, &mask_in4) > 0)
 249                 {
 250                         memcpy(&addr_raw, &address_in4.s_addr, 4);
 251                         memcpy(&mask_raw, &mask_in4.s_addr, 4);
 252
 253                         if (bits > 32)
 254                                 bits = 32;
 255                 }
 256                 else
 257                 {
 258                         /* The address was valid ipv4,
 259                          * but the mask that went with it wasnt.
 260                          */
 261                         free(mask);
 262                         return false;
 263                 }
 264         }
 265         else
 266         {
 267                 /* The address was neither ipv4 or ipv6 */
 268                 free(mask);
 269                 return false;
 270         }
 271
 272         /* Low-level-match the bits in the raw data */
 273         free(mask);
 274         return MatchCIDRBits(addr_raw, mask_raw, bits);
 275 }
 276
 277 inline void irc::sockets::Blocking(int s)
 278 {
 279         int flags = fcntl(s, F_GETFL, 0);
 280         fcntl(s, F_SETFL, flags ^ O_NONBLOCK);
 281 }
 282
 283 inline void irc::sockets::NonBlocking(int s)
 284 {
 285         int flags = fcntl(s, F_GETFL, 0);
 286         fcntl(s, F_SETFL, flags | O_NONBLOCK);
 287 }
 288
 289
 290 /** This will bind a socket to a port. It works for UDP/TCP.
 291  * It can only bind to IP addresses, if you wish to bind to hostnames
 292  * you should first resolve them using class 'Resolver'.
 293  */
 294 bool InspIRCd::BindSocket(int sockfd, insp_sockaddr client, insp_sockaddr server, int port, char* addr)
 295 {
 296         memset(&server,0,sizeof(server));
 297         insp_inaddr addy;
 298
 299         if (*addr == '*')
 300                 *addr = 0;
 301
 302         if ((*addr) && (insp_aton(addr,&addy) < 1))
 303         {
 304                 this->Log(DEBUG,"Invalid IP '%s' given to BindSocket()", addr);
 305                 return false;;
 306         }
 307
 308 #ifdef IPV6
 309         server.sin6_family = AF_FAMILY;
 310 #else
 311         server.sin_family = AF_FAMILY;
 312 #endif
 313         if (!*addr)
 314         {
 315 #ifdef IPV6
 316                 memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
 317 #else
 318                 server.sin_addr.s_addr = htonl(INADDR_ANY);
 319 #endif
 320         }
 321         else
 322         {
 323 #ifdef IPV6
 324                 memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
 325 #else
 326                 server.sin_addr = addy;
 327 #endif
 328         }
 329 #ifdef IPV6
 330         server.sin6_port = htons(port);
 331 #else
 332         server.sin_port = htons(port);
 333 #endif
 334         if (bind(sockfd,(struct sockaddr*)&server,sizeof(server)) < 0)
 335         {
 336                 return false;
 337         }
 338         else
 339         {
 340                 this->Log(DEBUG,"Bound port %s:%d",*addr ? addr : "*",port);
 341                 if (listen(sockfd, Config->MaxConn) == -1)
 342                 {
 343                         this->Log(DEFAULT,"ERROR in listen(): %s",strerror(errno));
 344                         return false;
 345                 }
 346                 else
 347                 {
 348                         NonBlocking(sockfd);
 349                         return true;
 350                 }
 351         }
 352 }
 353
 354
 355 // Open a TCP Socket
 356 int irc::sockets::OpenTCPSocket()
 357 {
 358         int sockfd;
 359         int on = 1;
 360         struct linger linger = { 0 };
 361
 362         if ((sockfd = socket (AF_FAMILY, SOCK_STREAM, 0)) < 0)
 363         {
 364                 return ERROR;
 365         }
 366         else
 367         {
 368                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 369                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
 370                 linger.l_onoff = 1;
 371                 linger.l_linger = 1;
 372                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &linger,sizeof(linger));
 373                 return (sockfd);
 374         }
 375 }
 376
 377 /* XXX: Probably belongs in class InspIRCd */
 378 bool InspIRCd::HasPort(int port, char* addr)
 379 {
 380         for (unsigned long count = 0; count < stats->BoundPortCount; count++)
 381         {
 382                 if ((port == Config->ports[count]) && (!strcasecmp(Config->addrs[count],addr)))
 383                 {
 384                         return true;
 385                 }
 386         }
 387         return false;
 388 }
 389
 390 /* XXX: Probably belongs in class InspIRCd */
 391 int InspIRCd::BindPorts(bool bail)
 392 {
 393         char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF];
 394         insp_sockaddr client, server;
 395         int clientportcount = 0;
 396         int BoundPortCount = 0;
 397
 398         if (!bail)
 399         {
 400                 int InitialPortCount = stats->BoundPortCount;
 401                 this->Log(DEBUG,"Initial port count: %d",InitialPortCount);
 402
 403                 for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 404                 {
 405                         Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 406                         Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 407                         Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 408
 409                         if (((!*Type) || (!strcmp(Type,"clients"))) && (!HasPort(atoi(configToken),Addr)))
 410                         {
 411                                 // modules handle server bind types now
 412                                 Config->ports[clientportcount+InitialPortCount] = atoi(configToken);
 413                                 if (*Addr == '*')
 414                                         *Addr = 0;
 415
 416                                 strlcpy(Config->addrs[clientportcount+InitialPortCount],Addr,256);
 417                                 clientportcount++;
 418                                 this->Log(DEBUG,"NEW binding %s:%s [%s] from config",Addr,configToken, Type);
 419                         }
 420                 }
 421                 int PortCount = clientportcount;
 422                 if (PortCount)
 423                 {
 424                         BoundPortCount = stats->BoundPortCount;
 425                         for (int count = InitialPortCount; count < InitialPortCount + PortCount; count++)
 426                         {
 427                                 int fd = OpenTCPSocket();
 428                                 if (fd == ERROR)
 429                                 {
 430                                         this->Log(DEBUG,"Bad fd %d binding port [%s:%d]",fd,Config->addrs[count],Config->ports[count]);
 431                                 }
 432                                 else
 433                                 {
 434                                         Config->openSockfd[BoundPortCount] = new ListenSocket(this,fd,client,server,Config->ports[count],Config->addrs[count]);
 435                                         if (Config->openSockfd[BoundPortCount]->GetFd() > -1)
 436                                         {
 437                                                 if (!SE->AddFd(Config->openSockfd[BoundPortCount]))
 438                                                 {
 439                                                         this->Log(DEFAULT,"ERK! Failed to add listening port to socket engine!");
 440                                                         shutdown(Config->openSockfd[BoundPortCount]->GetFd(),2);
 441                                                         close(Config->openSockfd[BoundPortCount]->GetFd());
 442                                                         delete Config->openSockfd[BoundPortCount];
 443                                                 }
 444                                                 else
 445                                                         BoundPortCount++;
 446                                         }
 447                                         /*if (!BindSocket(Config->openSockfd[count],client,server,Config->ports[count],Config->addrs[count]))
 448                                         {
 449                                                 this->Log(DEFAULT,"Failed to bind port [%s:%d]: %s",Config->addrs[count],Config->ports[count],strerror(errno));
 450                                         }*/
 451                                 }
 452                         }
 453                         return InitialPortCount + BoundPortCount;
 454                 }
 455                 else
 456                 {
 457                         this->Log(DEBUG,"There is nothing new to bind!");
 458                 }
 459                 return InitialPortCount;
 460         }
 461
 462         for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 463         {
 464                 Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 465                 Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 466                 Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 467
 468                 if ((!*Type) || (!strcmp(Type,"clients")))
 469                 {
 470                         // modules handle server bind types now
 471                         Config->ports[clientportcount] = atoi(configToken);
 472
 473                         // If the client put bind "*", this is an unrealism.
 474                         // We don't actually support this as documented, but
 475                         // i got fed up of people trying it, so now it converts
 476                         // it to an empty string meaning the same 'bind to all'.
 477                         if (*Addr == '*')
 478                                 *Addr = 0;
 479
 480                         strlcpy(Config->addrs[clientportcount],Addr,256);
 481                         clientportcount++;
 482                         this->Log(DEBUG,"Binding %s:%s [%s] from config",Addr,configToken, Type);
 483                 }
 484         }
 485
 486         int PortCount = clientportcount;
 487
 488         for (int count = 0; count < PortCount; count++)
 489         {
 490                 int fd = OpenTCPSocket();
 491                 if (fd == ERROR)
 492                 {
 493                         this->Log(DEBUG,"Bad fd %d binding port [%s:%d]",fd,Config->addrs[count],Config->ports[count]);
 494                 }
 495                 else
 496                 {
 497                         Config->openSockfd[BoundPortCount] = new ListenSocket(this,fd,client,server,Config->ports[count],Config->addrs[count]);
 498                         if (Config->openSockfd[BoundPortCount]->GetFd() > -1)
 499                         {
 500                                 BoundPortCount++;
 501                         }
 502                         /*if (!BindSocket(Config->openSockfd[BoundPortCount],client,server,Config->ports[count],Config->addrs[count]))
 503                         {
 504                                 this->Log(DEFAULT,"Failed to bind port [%s:%d]: %s",Config->addrs[count],Config->ports[count],strerror(errno));
 505                         }*/
 506                 }
 507         }
 508         return BoundPortCount;
 509 }
 510
 511 const char* irc::sockets::insp_ntoa(insp_inaddr n)
 512 {
 513         static char buf[1024];
 514         inet_ntop(AF_FAMILY, &n, buf, sizeof(buf));
 515         return buf;
 516 }
 517
 518 int irc::sockets::insp_aton(const char* a, insp_inaddr* n)
 519 {
 520         return inet_pton(AF_FAMILY, a, n);
 521 }
 522