/* +------------------------------------+ * | Inspire Internet Relay Chat Daemon | * +------------------------------------+ * * InspIRCd: (C) 2002-2008 InspIRCd Development Team * See: http://www.inspircd.org/wiki/index.php/Credits * * This program is free but copyrighted software; see * the file COPYING for details. * * --------------------------------------------------- */ /* $Core: libIRCDsocket */ #include "inspircd.h" #include "socket.h" #include "socketengine.h" #include "wildcard.h" using namespace irc::sockets; /* Used when comparing CIDR masks for the modulus bits left over. * A lot of ircd's seem to do this: * ((-1) << (8 - (mask % 8))) * But imho, it sucks in comparison to a nice neat lookup table. */ const unsigned char inverted_bits[8] = { 0x00, /* 00000000 - 0 bits - never actually used */ 0x80, /* 10000000 - 1 bits */ 0xC0, /* 11000000 - 2 bits */ 0xE0, /* 11100000 - 3 bits */ 0xF0, /* 11110000 - 4 bits */ 0xF8, /* 11111000 - 5 bits */ 0xFC, /* 11111100 - 6 bits */ 0xFE /* 11111110 - 7 bits */ }; ListenSocket::ListenSocket(InspIRCd* Instance, int port, char* addr) : ServerInstance(Instance), desc("plaintext"), bind_addr(addr), bind_port(port) { this->SetFd(OpenTCPSocket(addr)); if (this->GetFd() > -1) { if (!Instance->BindSocket(this->fd,port,addr)) this->fd = -1; #ifdef IPV6 if ((!*addr) || (strchr(addr,':'))) this->family = AF_INET6; else #endif this->family = AF_INET; Instance->SE->AddFd(this); } } ListenSocket::~ListenSocket() { if (this->GetFd() > -1) { ServerInstance->SE->DelFd(this); ServerInstance->Logs->Log("SOCKET", DEBUG,"Shut down listener on fd %d", this->fd); if (ServerInstance->SE->Shutdown(this, 2) || ServerInstance->SE->Close(this)) ServerInstance->Logs->Log("SOCKET", DEBUG,"Failed to cancel listener: %s", strerror(errno)); this->fd = -1; } } // XXX this is a bit of an untidy way to avoid reallocating this constantly. also, we leak it on shutdown.. but that's kinda minor - w static sockaddr *sock_us; static sockaddr *client; static bool setup_sock = false; void ListenSocket::HandleEvent(EventType, int) { socklen_t uslen, length; // length of our port number int incomingSockfd, in_port; if (!setup_sock) { sock_us = new sockaddr[2]; client = new sockaddr[2]; setup_sock = true; } #ifdef IPV6 if (this->family == AF_INET6) { uslen = sizeof(sockaddr_in6); length = sizeof(sockaddr_in6); } else #endif { uslen = sizeof(sockaddr_in); length = sizeof(sockaddr_in); } incomingSockfd = ServerInstance->SE->Accept(this, (sockaddr*)client, &length); if ((incomingSockfd > -1) && (!ServerInstance->SE->GetSockName(this, sock_us, &uslen))) { char buf[MAXBUF]; #ifdef IPV6 if (this->family == AF_INET6) { inet_ntop(AF_INET6, &((const sockaddr_in6*)client)->sin6_addr, buf, sizeof(buf)); in_port = ntohs(((sockaddr_in6*)sock_us)->sin6_port); } else #endif { inet_ntop(AF_INET, &((const sockaddr_in*)client)->sin_addr, buf, sizeof(buf)); in_port = ntohs(((sockaddr_in*)sock_us)->sin_port); } ServerInstance->SE->NonBlocking(incomingSockfd); if (ServerInstance->Config->GetIOHook(in_port)) { try { ServerInstance->Config->GetIOHook(in_port)->OnRawSocketAccept(incomingSockfd, buf, in_port); } catch (CoreException& modexcept) { ServerInstance->Logs->Log("SOCKET", DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason()); } } ServerInstance->stats->statsAccept++; ServerInstance->Users->AddClient(ServerInstance, incomingSockfd, in_port, false, this->family, client); } else { ServerInstance->SE->Shutdown(incomingSockfd, 2); ServerInstance->SE->Close(incomingSockfd); ServerInstance->stats->statsRefused++; } } /* Match raw bytes using CIDR bit matching, used by higher level MatchCIDR() */ bool irc::sockets::MatchCIDRBits(unsigned char* address, unsigned char* mask, unsigned int mask_bits) { unsigned int divisor = mask_bits / 8; /* Number of whole bytes in the mask */ unsigned int modulus = mask_bits % 8; /* Remaining bits in the mask after whole bytes are dealt with */ /* First (this is faster) compare the odd bits with logic ops */ if (modulus) if ((address[divisor] & inverted_bits[modulus]) != (mask[divisor] & inverted_bits[modulus])) /* If they dont match, return false */ return false; /* Secondly (this is slower) compare the whole bytes */ if (memcmp(address, mask, divisor)) return false; /* The address matches the mask, to mask_bits bits of mask */ return true; } /* Match CIDR, but dont attempt to match() against leading *!*@ sections */ bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask) { return MatchCIDR(address, cidr_mask, false); } /* 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 * If you have a lot of hosts to match, youre probably better off building your mask once * and then using the lower level MatchCIDRBits directly. * * This will also attempt to match any leading usernames or nicknames on the mask, using * match(), when match_with_username is true. */ bool irc::sockets::MatchCIDR(const char* address, const char* cidr_mask, bool match_with_username) { unsigned char addr_raw[16]; unsigned char mask_raw[16]; unsigned int bits = 0; char* mask = NULL; /* The caller is trying to match ident@/bits. * Chop off the ident@ portion, use match() on it * seperately. */ if (match_with_username) { /* Duplicate the strings, and try to find the position * of the @ symbol in each */ char* address_dupe = strdup(address); char* cidr_dupe = strdup(cidr_mask); /* Use strchr not strrchr, because its going to be nearer to the left */ char* username_mask_pos = strrchr(cidr_dupe, '@'); char* username_addr_pos = strrchr(address_dupe, '@'); /* Both strings have an @ symbol in them */ if (username_mask_pos && username_addr_pos) { /* Zero out the location of the @ symbol */ *username_mask_pos = *username_addr_pos = 0; /* Try and match() the strings before the @ * symbols, and recursively call MatchCIDR without * username matching enabled to match the host part. */ bool result = (match(address_dupe, cidr_dupe) && MatchCIDR(username_addr_pos + 1, username_mask_pos + 1, false)); /* Free the stuff we created */ free(address_dupe); free(cidr_dupe); /* Return a result */ return result; } else { /* One or both didnt have an @ in, * just match as CIDR */ free(address_dupe); free(cidr_dupe); mask = strdup(cidr_mask); } } else { /* Make a copy of the cidr mask string, * we're going to change it */ mask = strdup(cidr_mask); } in_addr address_in4; in_addr mask_in4; /* Use strrchr for this, its nearer to the right */ char* bits_chars = strrchr(mask,'/'); if (bits_chars) { bits = atoi(bits_chars + 1); *bits_chars = 0; } else { /* No 'number of bits' field! */ free(mask); return false; } #ifdef SUPPORT_IP6LINKS in6_addr address_in6; in6_addr mask_in6; if (inet_pton(AF_INET6, address, &address_in6) > 0) { if (inet_pton(AF_INET6, mask, &mask_in6) > 0) { memcpy(&addr_raw, &address_in6.s6_addr, 16); memcpy(&mask_raw, &mask_in6.s6_addr, 16); if (bits > 128) bits = 128; } else { /* The address was valid ipv6, but the mask * that goes with it wasnt. */ free(mask); return false; } } else #endif if (inet_pton(AF_INET, address, &address_in4) > 0) { if (inet_pton(AF_INET, mask, &mask_in4) > 0) { memcpy(&addr_raw, &address_in4.s_addr, 4); memcpy(&mask_raw, &mask_in4.s_addr, 4); if (bits > 32) bits = 32; } else { /* The address was valid ipv4, * but the mask that went with it wasnt. */ free(mask); return false; } } else { /* The address was neither ipv4 or ipv6 */ free(mask); return false; } /* Low-level-match the bits in the raw data */ free(mask); return MatchCIDRBits(addr_raw, mask_raw, bits); } /** This will bind a socket to a port. It works for UDP/TCP. * It can only bind to IP addresses, if you wish to bind to hostnames * you should first resolve them using class 'Resolver'. */ bool InspIRCd::BindSocket(int sockfd, int port, const char* addr, bool dolisten) { /* We allocate 2 of these, because sockaddr_in6 is larger than sockaddr (ugh, hax) */ sockaddr* servaddr = new sockaddr[2]; memset(servaddr,0,sizeof(sockaddr)*2); int ret, size; if (*addr == '*') addr = ""; #ifdef IPV6 if (*addr) { /* There is an address here. Is it ipv6? */ if (strchr(addr,':')) { /* Yes it is */ in6_addr addy; if (inet_pton(AF_INET6, addr, &addy) < 1) { delete[] servaddr; return false; } ((sockaddr_in6*)servaddr)->sin6_family = AF_INET6; memcpy(&(((sockaddr_in6*)servaddr)->sin6_addr), &addy, sizeof(in6_addr)); ((sockaddr_in6*)servaddr)->sin6_port = htons(port); size = sizeof(sockaddr_in6); } else { /* No, its not */ in_addr addy; if (inet_pton(AF_INET, addr, &addy) < 1) { delete[] servaddr; return false; } ((sockaddr_in*)servaddr)->sin_family = AF_INET; ((sockaddr_in*)servaddr)->sin_addr = addy; ((sockaddr_in*)servaddr)->sin_port = htons(port); size = sizeof(sockaddr_in); } } else { if (port == -1) { /* Port -1: Means UDP IPV4 port binding - Special case * used by DNS engine. */ ((sockaddr_in*)servaddr)->sin_family = AF_INET; ((sockaddr_in*)servaddr)->sin_addr.s_addr = htonl(INADDR_ANY); ((sockaddr_in*)servaddr)->sin_port = 0; size = sizeof(sockaddr_in); } else { /* Theres no address here, default to ipv6 bind to all */ ((sockaddr_in6*)servaddr)->sin6_family = AF_INET6; memset(&(((sockaddr_in6*)servaddr)->sin6_addr), 0, sizeof(in6_addr)); ((sockaddr_in6*)servaddr)->sin6_port = htons(port); size = sizeof(sockaddr_in6); } } #else /* If we aren't built with ipv6, the choice becomes simple */ ((sockaddr_in*)servaddr)->sin_family = AF_INET; if (*addr) { /* There is an address here. */ in_addr addy; if (inet_pton(AF_INET, addr, &addy) < 1) { delete[] servaddr; return false; } ((sockaddr_in*)servaddr)->sin_addr = addy; } else { /* Bind ipv4 to all */ ((sockaddr_in*)servaddr)->sin_addr.s_addr = htonl(INADDR_ANY); } /* Bind ipv4 port number */ ((sockaddr_in*)servaddr)->sin_port = htons(port); size = sizeof(sockaddr_in); #endif ret = SE->Bind(sockfd, servaddr, size); delete[] servaddr; if (ret < 0) { return false; } else { if (dolisten) { if (SE->Listen(sockfd, Config->MaxConn) == -1) { this->Logs->Log("SOCKET",DEFAULT,"ERROR in listen(): %s",strerror(errno)); return false; } else { this->Logs->Log("SOCKET",DEBUG,"New socket binding for %d with listen: %s:%d", sockfd, addr, port); SE->NonBlocking(sockfd); return true; } } else { this->Logs->Log("SOCKET",DEBUG,"New socket binding for %d without listen: %s:%d", sockfd, addr, port); return true; } } } // Open a TCP Socket int irc::sockets::OpenTCPSocket(char* addr, int socktype) { int sockfd; int on = 1; addr = addr; struct linger linger = { 0, 0 }; #ifdef IPV6 if (strchr(addr,':') || (!*addr)) sockfd = socket (PF_INET6, socktype, 0); else sockfd = socket (PF_INET, socktype, 0); if (sockfd < 0) #else if ((sockfd = socket (PF_INET, socktype, 0)) < 0) #endif { return ERROR; } else { setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (char*)&on, sizeof(on)); /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */ linger.l_onoff = 1; linger.l_linger = 1; setsockopt(sockfd, SOL_SOCKET, SO_LINGER, (char*)&linger,sizeof(linger)); return (sockfd); } } int InspIRCd::BindPorts(bool, int &ports_found, FailedPortList &failed_ports) { char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF]; int bound = 0; bool started_with_nothing = (Config->ports.size() == 0); std::vector > old_ports; /* XXX: Make a copy of the old ip/port pairs here */ for (std::vector::iterator o = Config->ports.begin(); o != Config->ports.end(); ++o) old_ports.push_back(make_pair((*o)->GetIP(), (*o)->GetPort())); for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++) { Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF); Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF); Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF); if (strncmp(Addr, "::ffff:", 7) == 0) this->Logs->Log("SOCKET",DEFAULT, "Using 4in6 (::ffff:) isn't recommended. You should bind IPv4 addresses directly instead."); if ((!*Type) || (!strcmp(Type,"clients"))) { irc::portparser portrange(configToken, false); int portno = -1; while ((portno = portrange.GetToken())) { if (*Addr == '*') *Addr = 0; bool skip = false; for (std::vector::iterator n = Config->ports.begin(); n != Config->ports.end(); ++n) { if (((*n)->GetIP() == Addr) && ((*n)->GetPort() == portno)) { skip = true; /* XXX: Here, erase from our copy of the list */ for (std::vector >::iterator k = old_ports.begin(); k != old_ports.end(); ++k) { if ((k->first == Addr) && (k->second == portno)) { old_ports.erase(k); break; } } } } if (!skip) { ListenSocket* ll = new ListenSocket(this, portno, Addr); if (ll->GetFd() > -1) { bound++; Config->ports.push_back(ll); } else { failed_ports.push_back(std::make_pair(Addr, portno)); } ports_found++; } } } } /* XXX: Here, anything left in our copy list, close as removed */ if (!started_with_nothing) { for (size_t k = 0; k < old_ports.size(); ++k) { for (std::vector::iterator n = Config->ports.begin(); n != Config->ports.end(); ++n) { if (((*n)->GetIP() == old_ports[k].first) && ((*n)->GetPort() == old_ports[k].second)) { this->Logs->Log("SOCKET",DEFAULT,"Port binding %s:%d was removed from the config file, closing.", old_ports[k].first.c_str(), old_ports[k].second); delete *n; Config->ports.erase(n); break; } } } } return bound; } const char* irc::sockets::insp_ntoa(insp_inaddr n) { static char buf[1024]; inet_ntop(AF_FAMILY, &n, buf, sizeof(buf)); return buf; } int irc::sockets::insp_aton(const char* a, insp_inaddr* n) { return inet_pton(AF_FAMILY, a, n); }