/* * InspIRCd -- Internet Relay Chat Daemon * * Copyright (C) 2019 linuxdaemon * Copyright (C) 2013-2014 Attila Molnar * Copyright (C) 2013, 2017-2021 Sadie Powell * Copyright (C) 2013 Daniel Vassdal * Copyright (C) 2012 Robby * Copyright (C) 2009-2011 Daniel De Graaf * Copyright (C) 2009 Uli Schlachter * Copyright (C) 2008 Thomas Stagner * Copyright (C) 2007 John Brooks * Copyright (C) 2007 Dennis Friis * Copyright (C) 2006 Craig Edwards * * This file is part of InspIRCd. InspIRCd is free software: you can * redistribute it and/or modify it under the terms of the GNU General Public * License as published by the Free Software Foundation, version 2. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "inspircd.h" bool InspIRCd::BindPort(ConfigTag* tag, const irc::sockets::sockaddrs& sa, std::vector& old_ports) { for (std::vector::iterator n = old_ports.begin(); n != old_ports.end(); ++n) { if ((**n).bind_sa == sa) { // Replace tag, we know addr and port match, but other info (type, ssl) may not. ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "Replacing listener on %s from old tag at %s with new tag from %s", sa.str().c_str(), (*n)->bind_tag->getTagLocation().c_str(), tag->getTagLocation().c_str()); (*n)->bind_tag = tag; (*n)->ResetIOHookProvider(); old_ports.erase(n); return true; } } ListenSocket* ll = new ListenSocket(tag, sa); if (!ll->HasFd()) { ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "Failed to listen on %s from tag at %s: %s", sa.str().c_str(), tag->getTagLocation().c_str(), strerror(errno)); delete ll; return false; } ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "Added a listener on %s from tag at %s", sa.str().c_str(), tag->getTagLocation().c_str()); ports.push_back(ll); return true; } size_t InspIRCd::BindPorts(FailedPortList& failed_ports) { size_t bound = 0; std::vector old_ports(ports.begin(), ports.end()); ConfigTagList tags = ServerInstance->Config->ConfTags("bind"); for (ConfigIter i = tags.first; i != tags.second; ++i) { ConfigTag* tag = i->second; // Are we creating a TCP/IP listener? const std::string address = tag->getString("address"); const std::string portlist = tag->getString("port"); if (!address.empty() || !portlist.empty()) { // InspIRCd supports IPv4 and IPv6 natively; no 4in6 required. if (strncasecmp(address.c_str(), "::ffff:", 7) == 0) this->Logs->Log("SOCKET", LOG_DEFAULT, "Using 4in6 (::ffff:) isn't recommended. You should bind IPv4 addresses directly instead."); // A TCP listener with no ports is not very useful. if (portlist.empty()) this->Logs->Log("SOCKET", LOG_DEFAULT, "TCP listener on %s at %s has no ports specified!", address.empty() ? "*" : address.c_str(), tag->getTagLocation().c_str()); irc::portparser portrange(portlist, false); for (int port; (port = portrange.GetToken()); ) { irc::sockets::sockaddrs bindspec; if (!irc::sockets::aptosa(address, port, bindspec)) continue; if (!BindPort(tag, bindspec, old_ports)) failed_ports.push_back(FailedPort(errno, bindspec, tag)); else bound++; } continue; } #ifndef _WIN32 // Are we creating a UNIX listener? const std::string path = tag->getString("path"); if (!path.empty()) { // Expand the path relative to the config directory. const std::string fullpath = ServerInstance->Config->Paths.PrependRuntime(path); // UNIX socket paths are length limited to less than PATH_MAX. irc::sockets::sockaddrs bindspec; if (fullpath.length() > std::min(ServerInstance->Config->Limits.MaxHost, sizeof(bindspec.un.sun_path) - 1)) { this->Logs->Log("SOCKET", LOG_DEFAULT, "UNIX listener on %s at %s specified a path that is too long!", fullpath.c_str(), tag->getTagLocation().c_str()); continue; } // Check for characters which are problematic in the IRC message format. if (fullpath.find_first_of("\n\r\t!@: ") != std::string::npos) { this->Logs->Log("SOCKET", LOG_DEFAULT, "UNIX listener on %s at %s specified a path containing invalid characters!", fullpath.c_str(), tag->getTagLocation().c_str()); continue; } irc::sockets::untosa(fullpath, bindspec); if (!BindPort(tag, bindspec, old_ports)) failed_ports.push_back(FailedPort(errno, bindspec, tag)); else bound++; } #endif } std::vector::iterator n = ports.begin(); for (std::vector::iterator o = old_ports.begin(); o != old_ports.end(); ++o) { while (n != ports.end() && *n != *o) n++; if (n == ports.end()) { this->Logs->Log("SOCKET", LOG_DEFAULT, "Port bindings slipped out of vector, aborting close!"); break; } this->Logs->Log("SOCKET", LOG_DEFAULT, "Port binding %s was removed from the config file, closing.", (**n).bind_sa.str().c_str()); delete *n; // this keeps the iterator valid, pointing to the next element n = ports.erase(n); } return bound; } bool irc::sockets::aptosa(const std::string& addr, int port, irc::sockets::sockaddrs& sa) { memset(&sa, 0, sizeof(sa)); if (addr.empty() || addr.c_str()[0] == '*') { if (ServerInstance->Config->WildcardIPv6) { sa.in6.sin6_family = AF_INET6; sa.in6.sin6_port = htons(port); } else { sa.in4.sin_family = AF_INET; sa.in4.sin_port = htons(port); } return true; } else if (inet_pton(AF_INET, addr.c_str(), &sa.in4.sin_addr) > 0) { sa.in4.sin_family = AF_INET; sa.in4.sin_port = htons(port); return true; } else if (inet_pton(AF_INET6, addr.c_str(), &sa.in6.sin6_addr) > 0) { sa.in6.sin6_family = AF_INET6; sa.in6.sin6_port = htons(port); return true; } return false; } bool irc::sockets::untosa(const std::string& path, irc::sockets::sockaddrs& sa) { memset(&sa, 0, sizeof(sa)); if (path.length() >= sizeof(sa.un.sun_path)) return false; sa.un.sun_family = AF_UNIX; memcpy(&sa.un.sun_path, path.c_str(), path.length() + 1); return true; } bool irc::sockets::isunix(const std::string& file) { #ifndef _WIN32 struct stat sb; if (stat(file.c_str(), &sb) == 0 && S_ISSOCK(sb.st_mode)) return true; #endif return false; } int irc::sockets::sockaddrs::family() const { return sa.sa_family; } int irc::sockets::sockaddrs::port() const { switch (family()) { case AF_INET: return ntohs(in4.sin_port); case AF_INET6: return ntohs(in6.sin6_port); case AF_UNIX: return 0; } // If we have reached this point then we have encountered a bug. ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "BUG: irc::sockets::sockaddrs::port(): socket type %d is unknown!", family()); return 0; } std::string irc::sockets::sockaddrs::addr() const { switch (family()) { case AF_INET: char ip4addr[INET_ADDRSTRLEN]; if (!inet_ntop(AF_INET, (void*)&in4.sin_addr, ip4addr, sizeof(ip4addr))) return "0.0.0.0"; return ip4addr; case AF_INET6: char ip6addr[INET6_ADDRSTRLEN]; if (!inet_ntop(AF_INET6, (void*)&in6.sin6_addr, ip6addr, sizeof(ip6addr))) return "0:0:0:0:0:0:0:0"; return ip6addr; case AF_UNIX: return un.sun_path; } // If we have reached this point then we have encountered a bug. ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "BUG: irc::sockets::sockaddrs::addr(): socket type %d is unknown!", family()); return ""; } std::string irc::sockets::sockaddrs::str() const { switch (family()) { case AF_INET: char ip4addr[INET_ADDRSTRLEN]; if (!inet_ntop(AF_INET, (void*)&in4.sin_addr, ip4addr, sizeof(ip4addr))) strcpy(ip4addr, "0.0.0.0"); return InspIRCd::Format("%s:%u", ip4addr, ntohs(in4.sin_port)); case AF_INET6: char ip6addr[INET6_ADDRSTRLEN]; if (!inet_ntop(AF_INET6, (void*)&in6.sin6_addr, ip6addr, sizeof(ip6addr))) strcpy(ip6addr, "0:0:0:0:0:0:0:0"); return InspIRCd::Format("[%s]:%u", ip6addr, ntohs(in6.sin6_port)); case AF_UNIX: return un.sun_path; } // If we have reached this point then we have encountered a bug. ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "BUG: irc::sockets::sockaddrs::str(): socket type %d is unknown!", family()); return ""; } socklen_t irc::sockets::sockaddrs::sa_size() const { switch (family()) { case AF_INET: return sizeof(in4); case AF_INET6: return sizeof(in6); case AF_UNIX: return sizeof(un); } // If we have reached this point then we have encountered a bug. ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "BUG: irc::sockets::sockaddrs::sa_size(): socket type %d is unknown!", family()); return 0; } bool irc::sockets::sockaddrs::operator==(const irc::sockets::sockaddrs& other) const { if (family() != other.family()) return false; switch (family()) { case AF_INET: return (in4.sin_port == other.in4.sin_port) && (in4.sin_addr.s_addr == other.in4.sin_addr.s_addr); case AF_INET6: return (in6.sin6_port == other.in6.sin6_port) && !memcmp(in6.sin6_addr.s6_addr, other.in6.sin6_addr.s6_addr, 16); case AF_UNIX: return !strcmp(un.sun_path, other.un.sun_path); } // If we have reached this point then we have encountered a bug. ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "BUG: irc::sockets::sockaddrs::operator==(): socket type %d is unknown!", family()); return !memcmp(this, &other, sizeof(*this)); } static void sa2cidr(irc::sockets::cidr_mask& cidr, const irc::sockets::sockaddrs& sa, unsigned char range) { const unsigned char* base; unsigned char target_byte; memset(cidr.bits, 0, sizeof(cidr.bits)); cidr.type = sa.family(); switch (cidr.type) { case AF_UNIX: // XXX: UNIX sockets don't support CIDR. This fix is non-ideal but I can't // really think of another way to handle it. cidr.length = 0; return; case AF_INET: cidr.length = range > 32 ? 32 : range; target_byte = sizeof(sa.in4.sin_addr); base = (unsigned char*)&sa.in4.sin_addr; break; case AF_INET6: cidr.length = range > 128 ? 128 : range; target_byte = sizeof(sa.in6.sin6_addr); base = (unsigned char*)&sa.in6.sin6_addr; break; default: // If we have reached this point then we have encountered a bug. ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "BUG: sa2cidr(): socket type %d is unknown!", cidr.type); cidr.length = 0; return; } unsigned int border = cidr.length / 8; unsigned int bitmask = (0xFF00 >> (range & 7)) & 0xFF; for(unsigned int i=0; i < target_byte; i++) { if (i < border) cidr.bits[i] = base[i]; else if (i == border) cidr.bits[i] = base[i] & bitmask; else return; } } irc::sockets::cidr_mask::cidr_mask(const irc::sockets::sockaddrs& sa, unsigned char range) { sa2cidr(*this, sa, range); } irc::sockets::cidr_mask::cidr_mask(const std::string& mask) { std::string::size_type bits_chars = mask.rfind('/'); irc::sockets::sockaddrs sa; if (bits_chars == std::string::npos) { irc::sockets::aptosa(mask, 0, sa); sa2cidr(*this, sa, 128); } else { unsigned char range = ConvToNum(mask.substr(bits_chars + 1)); irc::sockets::aptosa(mask.substr(0, bits_chars), 0, sa); sa2cidr(*this, sa, range); } } std::string irc::sockets::cidr_mask::str() const { irc::sockets::sockaddrs sa; sa.sa.sa_family = type; unsigned char* base; size_t len; switch (type) { case AF_INET: base = (unsigned char*)&sa.in4.sin_addr; len = 4; break; case AF_INET6: base = (unsigned char*)&sa.in6.sin6_addr; len = 16; break; case AF_UNIX: return sa.un.sun_path; default: // If we have reached this point then we have encountered a bug. ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "BUG: irc::sockets::cidr_mask::str(): socket type %d is unknown!", type); return ""; } memcpy(base, bits, len); return sa.addr() + "/" + ConvToStr((int)length); } bool irc::sockets::cidr_mask::operator==(const cidr_mask& other) const { return type == other.type && length == other.length && 0 == memcmp(bits, other.bits, 16); } bool irc::sockets::cidr_mask::operator<(const cidr_mask& other) const { if (type != other.type) return type < other.type; if (length != other.length) return length < other.length; return memcmp(bits, other.bits, 16) < 0; } bool irc::sockets::cidr_mask::match(const irc::sockets::sockaddrs& addr) const { if (addr.family() != type) return false; irc::sockets::cidr_mask tmp(addr, length); return tmp == *this; }