src/socket.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
   6  *   Copyright (C) 2005-2008 Craig Edwards <craigedwards@brainbox.cc>
   7  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   8  *   Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
   9  *
  10  * This file is part of InspIRCd.  InspIRCd is free software: you can
  11  * redistribute it and/or modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation, version 2.
  13  *
  14  * This program is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  16  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23
  24 #include "inspircd.h"
  25
  26 int InspIRCd::BindPorts(FailedPortList &failed_ports)
  27 {
  28         int bound = 0;
  29         std::vector<ListenSocket*> old_ports(ports.begin(), ports.end());
  30
  31         ConfigTagList tags = ServerInstance->Config->ConfTags("bind");
  32         for(ConfigIter i = tags.first; i != tags.second; ++i)
  33         {
  34                 ConfigTag* tag = i->second;
  35                 std::string porttag = tag->getString("port");
  36                 std::string Addr = tag->getString("address");
  37
  38                 if (strncasecmp(Addr.c_str(), "::ffff:", 7) == 0)
  39                         this->Logs->Log("SOCKET", LOG_DEFAULT, "Using 4in6 (::ffff:) isn't recommended. You should bind IPv4 addresses directly instead.");
  40
  41                 irc::portparser portrange(porttag, false);
  42                 int portno = -1;
  43                 while (0 != (portno = portrange.GetToken()))
  44                 {
  45                         irc::sockets::sockaddrs bindspec;
  46                         if (!irc::sockets::aptosa(Addr, portno, bindspec))
  47                                 continue;
  48
  49                         bool skip = false;
  50                         for (std::vector<ListenSocket*>::iterator n = old_ports.begin(); n != old_ports.end(); ++n)
  51                         {
  52                                 if ((**n).bind_sa == bindspec)
  53                                 {
  54                                         (*n)->bind_tag = tag; // Replace tag, we know addr and port match, but other info (type, ssl) may not
  55                                         (*n)->ResetIOHookProvider();
  56
  57                                         skip = true;
  58                                         old_ports.erase(n);
  59                                         break;
  60                                 }
  61                         }
  62                         if (!skip)
  63                         {
  64                                 ListenSocket* ll = new ListenSocket(tag, bindspec);
  65
  66                                 if (ll->GetFd() > -1)
  67                                 {
  68                                         bound++;
  69                                         ports.push_back(ll);
  70                                 }
  71                                 else
  72                                 {
  73                                         failed_ports.push_back(std::make_pair(bindspec, errno));
  74                                         delete ll;
  75                                 }
  76                         }
  77                 }
  78         }
  79
  80         std::vector<ListenSocket*>::iterator n = ports.begin();
  81         for (std::vector<ListenSocket*>::iterator o = old_ports.begin(); o != old_ports.end(); ++o)
  82         {
  83                 while (n != ports.end() && *n != *o)
  84                         n++;
  85                 if (n == ports.end())
  86                 {
  87                         this->Logs->Log("SOCKET", LOG_DEFAULT, "Port bindings slipped out of vector, aborting close!");
  88                         break;
  89                 }
  90
  91                 this->Logs->Log("SOCKET", LOG_DEFAULT, "Port binding %s was removed from the config file, closing.",
  92                         (**n).bind_sa.str().c_str());
  93                 delete *n;
  94
  95                 // this keeps the iterator valid, pointing to the next element
  96                 n = ports.erase(n);
  97         }
  98
  99         return bound;
 100 }
 101
 102 bool irc::sockets::aptosa(const std::string& addr, int port, irc::sockets::sockaddrs& sa)
 103 {
 104         memset(&sa, 0, sizeof(sa));
 105         if (addr.empty() || addr.c_str()[0] == '*')
 106         {
 107                 if (ServerInstance->Config->WildcardIPv6)
 108                 {
 109                         sa.in6.sin6_family = AF_INET6;
 110                         sa.in6.sin6_port = htons(port);
 111                 }
 112                 else
 113                 {
 114                         sa.in4.sin_family = AF_INET;
 115                         sa.in4.sin_port = htons(port);
 116                 }
 117                 return true;
 118         }
 119         else if (inet_pton(AF_INET, addr.c_str(), &sa.in4.sin_addr) > 0)
 120         {
 121                 sa.in4.sin_family = AF_INET;
 122                 sa.in4.sin_port = htons(port);
 123                 return true;
 124         }
 125         else if (inet_pton(AF_INET6, addr.c_str(), &sa.in6.sin6_addr) > 0)
 126         {
 127                 sa.in6.sin6_family = AF_INET6;
 128                 sa.in6.sin6_port = htons(port);
 129                 return true;
 130         }
 131         return false;
 132 }
 133
 134 int irc::sockets::sockaddrs::family() const
 135 {
 136         return sa.sa_family;
 137 }
 138
 139 int irc::sockets::sockaddrs::port() const
 140 {
 141         if (family() == AF_INET)
 142                 return ntohs(in4.sin_port);
 143         if (family() == AF_INET6)
 144                 return ntohs(in6.sin6_port);
 145         return -1;
 146 }
 147
 148 std::string irc::sockets::sockaddrs::addr() const
 149 {
 150         char addrv[INET6_ADDRSTRLEN+1];
 151         if (family() == AF_INET)
 152         {
 153                 if (!inet_ntop(AF_INET, (void*)&in4.sin_addr, addrv, sizeof(addrv)))
 154                         return "";
 155                 return addrv;
 156         }
 157         else if (family() == AF_INET6)
 158         {
 159                 if (!inet_ntop(AF_INET6, (void*)&in6.sin6_addr, addrv, sizeof(addrv)))
 160                         return "";
 161                 return addrv;
 162         }
 163         return "";
 164 }
 165
 166 std::string irc::sockets::sockaddrs::str() const
 167 {
 168         if (family() == AF_INET)
 169         {
 170                 char ipaddr[INET_ADDRSTRLEN];
 171                 inet_ntop(AF_INET, (void*)&in4.sin_addr, ipaddr, sizeof(ipaddr));
 172                 return InspIRCd::Format("%s:%u", ipaddr, ntohs(in4.sin_port));
 173         }
 174
 175         if (family() == AF_INET6)
 176         {
 177                 char ipaddr[INET6_ADDRSTRLEN];
 178                 inet_ntop(AF_INET6, (void*)&in6.sin6_addr, ipaddr, sizeof(ipaddr));
 179                 return InspIRCd::Format("[%s]:%u", ipaddr, ntohs(in6.sin6_port));
 180         }
 181
 182         // This should never happen.
 183         return "<unknown>";
 184 }
 185
 186 socklen_t irc::sockets::sockaddrs::sa_size() const
 187 {
 188         if (family() == AF_INET)
 189                 return sizeof(in4);
 190         if (family() == AF_INET6)
 191                 return sizeof(in6);
 192         return 0;
 193 }
 194
 195 bool irc::sockets::sockaddrs::operator==(const irc::sockets::sockaddrs& other) const
 196 {
 197         if (family() != other.family())
 198                 return false;
 199         if (family() ==  AF_INET)
 200                 return (in4.sin_port == other.in4.sin_port) && (in4.sin_addr.s_addr == other.in4.sin_addr.s_addr);
 201         if (family() ==  AF_INET6)
 202                 return (in6.sin6_port == other.in6.sin6_port) && !memcmp(in6.sin6_addr.s6_addr, other.in6.sin6_addr.s6_addr, 16);
 203         return !memcmp(this, &other, sizeof(*this));
 204 }
 205
 206 static void sa2cidr(irc::sockets::cidr_mask& cidr, const irc::sockets::sockaddrs& sa, unsigned char range)
 207 {
 208         const unsigned char* base;
 209         unsigned char target_byte;
 210         cidr.type = sa.family();
 211
 212         memset(cidr.bits, 0, sizeof(cidr.bits));
 213
 214         if (cidr.type == AF_INET)
 215         {
 216                 target_byte = sizeof(sa.in4.sin_addr);
 217                 base = (unsigned char*)&sa.in4.sin_addr;
 218                 if (range > 32)
 219                         range = 32;
 220         }
 221         else if (cidr.type == AF_INET6)
 222         {
 223                 target_byte = sizeof(sa.in6.sin6_addr);
 224                 base = (unsigned char*)&sa.in6.sin6_addr;
 225                 if (range > 128)
 226                         range = 128;
 227         }
 228         else
 229         {
 230                 cidr.length = 0;
 231                 return;
 232         }
 233         cidr.length = range;
 234         unsigned int border = range / 8;
 235         unsigned int bitmask = (0xFF00 >> (range & 7)) & 0xFF;
 236         for(unsigned int i=0; i < target_byte; i++)
 237         {
 238                 if (i < border)
 239                         cidr.bits[i] = base[i];
 240                 else if (i == border)
 241                         cidr.bits[i] = base[i] & bitmask;
 242                 else
 243                         return;
 244         }
 245 }
 246
 247 irc::sockets::cidr_mask::cidr_mask(const irc::sockets::sockaddrs& sa, unsigned char range)
 248 {
 249         sa2cidr(*this, sa, range);
 250 }
 251
 252 irc::sockets::cidr_mask::cidr_mask(const std::string& mask)
 253 {
 254         std::string::size_type bits_chars = mask.rfind('/');
 255         irc::sockets::sockaddrs sa;
 256
 257         if (bits_chars == std::string::npos)
 258         {
 259                 irc::sockets::aptosa(mask, 0, sa);
 260                 sa2cidr(*this, sa, 128);
 261         }
 262         else
 263         {
 264                 int range = ConvToInt(mask.substr(bits_chars + 1));
 265                 irc::sockets::aptosa(mask.substr(0, bits_chars), 0, sa);
 266                 sa2cidr(*this, sa, range);
 267         }
 268 }
 269
 270 std::string irc::sockets::cidr_mask::str() const
 271 {
 272         irc::sockets::sockaddrs sa;
 273         sa.sa.sa_family = type;
 274         unsigned char* base;
 275         size_t len;
 276         if (type == AF_INET)
 277         {
 278                 base = (unsigned char*)&sa.in4.sin_addr;
 279                 len = 4;
 280         }
 281         else if (type == AF_INET6)
 282         {
 283                 base = (unsigned char*)&sa.in6.sin6_addr;
 284                 len = 16;
 285         }
 286         else
 287                 return "";
 288         memcpy(base, bits, len);
 289         return sa.addr() + "/" + ConvToStr((int)length);
 290 }
 291
 292 bool irc::sockets::cidr_mask::operator==(const cidr_mask& other) const
 293 {
 294         return type == other.type && length == other.length &&
 295                 0 == memcmp(bits, other.bits, 16);
 296 }
 297
 298 bool irc::sockets::cidr_mask::operator<(const cidr_mask& other) const
 299 {
 300         if (type != other.type)
 301                 return type < other.type;
 302         if (length != other.length)
 303                 return length < other.length;
 304         return memcmp(bits, other.bits, 16) < 0;
 305 }
 306
 307 bool irc::sockets::cidr_mask::match(const irc::sockets::sockaddrs& addr) const
 308 {
 309         if (addr.family() != type)
 310                 return false;
 311         irc::sockets::cidr_mask tmp(addr, length);
 312         return tmp == *this;
 313 }