src/socket.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 /* $Core */
  15
  16 #include "inspircd.h"
  17 #include "socket.h"
  18 #include "socketengine.h"
  19 using irc::sockets::sockaddrs;
  20
  21 /** This will bind a socket to a port. It works for UDP/TCP.
  22  * It can only bind to IP addresses, if you wish to bind to hostnames
  23  * you should first resolve them using class 'Resolver'.
  24  */
  25 bool InspIRCd::BindSocket(int sockfd, int port, const char* addr, bool dolisten)
  26 {
  27         sockaddrs servaddr;
  28         int ret;
  29
  30         if ((*addr == '*' || *addr == '\0') && port == -1)
  31         {
  32                 /* Port -1: Means UDP IPV4 port binding - Special case
  33                  * used by DNS engine.
  34                  */
  35                 memset(&servaddr, 0, sizeof(servaddr));
  36                 servaddr.in4.sin_family = AF_INET;
  37         }
  38         else if (!irc::sockets::aptosa(addr, port, &servaddr))
  39                 return false;
  40
  41         ret = SE->Bind(sockfd, &servaddr.sa, sa_size(servaddr));
  42
  43         if (ret < 0)
  44         {
  45                 return false;
  46         }
  47         else
  48         {
  49                 if (dolisten)
  50                 {
  51                         if (SE->Listen(sockfd, Config->MaxConn) == -1)
  52                         {
  53                                 this->Logs->Log("SOCKET",DEFAULT,"ERROR in listen(): %s",strerror(errno));
  54                                 return false;
  55                         }
  56                         else
  57                         {
  58                                 this->Logs->Log("SOCKET",DEBUG,"New socket binding for %d with listen: %s:%d", sockfd, addr, port);
  59                                 SE->NonBlocking(sockfd);
  60                                 return true;
  61                         }
  62                 }
  63                 else
  64                 {
  65                         this->Logs->Log("SOCKET",DEBUG,"New socket binding for %d without listen: %s:%d", sockfd, addr, port);
  66                         return true;
  67                 }
  68         }
  69 }
  70
  71 // Open a TCP Socket
  72 int irc::sockets::OpenTCPSocket(const std::string& addr, int socktype)
  73 {
  74         int sockfd;
  75         int on = 1;
  76         struct linger linger = { 0, 0 };
  77         if (addr.empty())
  78         {
  79 #ifdef IPV6
  80                 sockfd = socket (PF_INET6, socktype, 0);
  81                 if (sockfd < 0)
  82 #endif
  83                         sockfd = socket (PF_INET, socktype, 0);
  84         }
  85         else if (addr.find(':') != std::string::npos)
  86                 sockfd = socket (PF_INET6, socktype, 0);
  87         else
  88                 sockfd = socket (PF_INET, socktype, 0);
  89
  90         if (sockfd < 0)
  91         {
  92                 return ERROR;
  93         }
  94         else
  95         {
  96                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (char*)&on, sizeof(on));
  97                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
  98                 linger.l_onoff = 1;
  99                 linger.l_linger = 1;
 100                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, (char*)&linger, sizeof(linger));
 101                 return (sockfd);
 102         }
 103 }
 104
 105 // XXX: it would be VERY nice to genericize this so all listen stuff (server/client) could use the one function. -- w00t
 106 int InspIRCd::BindPorts(FailedPortList &failed_ports)
 107 {
 108         int bound = 0;
 109         std::vector<ListenSocketBase*> old_ports(ports.begin(), ports.end());
 110
 111         for (int count = 0;; count++)
 112         {
 113                 ConfigTag* tag = ServerInstance->Config->ConfValue("bind", count);
 114                 if (!tag)
 115                         break;
 116                 std::string porttag = tag->getString("port");
 117                 std::string Addr = tag->getString("address");
 118                 std::string Type = tag->getString("type");
 119                 std::string Desc = tag->getString("ssl");
 120
 121                 if (strncmp(Addr.c_str(), "::ffff:", 7) == 0)
 122                         this->Logs->Log("SOCKET",DEFAULT, "Using 4in6 (::ffff:) isn't recommended. You should bind IPv4 addresses directly instead.");
 123
 124                 if (Type.empty() || Type == "clients")
 125                 {
 126                         irc::portparser portrange(porttag, false);
 127                         int portno = -1;
 128                         while (0 != (portno = portrange.GetToken()))
 129                         {
 130                                 irc::sockets::sockaddrs bindspec;
 131                                 irc::sockets::aptosa(Addr, portno, &bindspec);
 132                                 std::string bind_readable = irc::sockets::satouser(&bindspec);
 133
 134                                 bool skip = false;
 135                                 for (std::vector<ListenSocketBase *>::iterator n = old_ports.begin(); n != old_ports.end(); ++n)
 136                                 {
 137                                         if ((*n)->GetBindDesc() == bind_readable)
 138                                         {
 139                                                 skip = true;
 140                                                 old_ports.erase(n);
 141                                                 break;
 142                                         }
 143                                 }
 144                                 if (!skip)
 145                                 {
 146                                         ClientListenSocket *ll = new ClientListenSocket(portno, Addr, "clients", Desc.empty() ? "plaintext" : Desc);
 147                                         if (ll->GetFd() > -1)
 148                                         {
 149                                                 bound++;
 150                                                 ports.push_back(ll);
 151                                         }
 152                                         else
 153                                         {
 154                                                 failed_ports.push_back(std::make_pair(bind_readable, strerror(errno)));
 155                                                 delete ll;
 156                                         }
 157                                 }
 158                         }
 159                 }
 160         }
 161
 162         std::vector<ListenSocketBase *>::iterator n = ports.begin();
 163         for (std::vector<ListenSocketBase *>::iterator o = old_ports.begin(); o != old_ports.end(); ++o)
 164         {
 165                 while (n != ports.end() && *n != *o)
 166                         n++;
 167                 if (n == ports.end())
 168                 {
 169                         this->Logs->Log("SOCKET",ERROR,"Port bindings slipped out of vector, aborting close!");
 170                         break;
 171                 }
 172
 173                 this->Logs->Log("SOCKET",DEFAULT, "Port binding %s was removed from the config file, closing.",
 174                         (*n)->GetBindDesc().c_str());
 175                 delete *n;
 176
 177                 // this keeps the iterator valid, pointing to the next element
 178                 n = ports.erase(n);
 179         }
 180
 181         return bound;
 182 }
 183
 184 bool irc::sockets::aptosa(const std::string& addr, int port, irc::sockets::sockaddrs* sa)
 185 {
 186         memset(sa, 0, sizeof(*sa));
 187         if (addr.empty())
 188         {
 189 #ifdef IPV6
 190                 sa->in6.sin6_family = AF_INET6;
 191                 sa->in6.sin6_port = htons(port);
 192 #else
 193                 sa->in4.sin_family = AF_INET;
 194                 sa->in4.sin_port = htons(port);
 195 #endif
 196                 return true;
 197         }
 198         else if (inet_pton(AF_INET, addr.c_str(), &sa->in4.sin_addr) > 0)
 199         {
 200                 sa->in4.sin_family = AF_INET;
 201                 sa->in4.sin_port = htons(port);
 202                 return true;
 203         }
 204         else if (inet_pton(AF_INET6, addr.c_str(), &sa->in6.sin6_addr) > 0)
 205         {
 206                 sa->in6.sin6_family = AF_INET6;
 207                 sa->in6.sin6_port = htons(port);
 208                 return true;
 209         }
 210         return false;
 211 }
 212
 213 bool irc::sockets::satoap(const irc::sockets::sockaddrs* sa, std::string& addr, int &port) {
 214         char addrv[INET6_ADDRSTRLEN+1];
 215         if (sa->sa.sa_family == AF_INET)
 216         {
 217                 if (!inet_ntop(AF_INET, &sa->in4.sin_addr, addrv, sizeof(addrv)))
 218                         return false;
 219                 addr = addrv;
 220                 port = ntohs(sa->in4.sin_port);
 221                 return true;
 222         }
 223         else if (sa->sa.sa_family == AF_INET6)
 224         {
 225                 if (!inet_ntop(AF_INET6, &sa->in6.sin6_addr, addrv, sizeof(addrv)))
 226                         return false;
 227                 addr = addrv;
 228                 port = ntohs(sa->in6.sin6_port);
 229                 return true;
 230         }
 231         return false;
 232 }
 233
 234 static const char all_zero[16] = {0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 };
 235
 236 std::string irc::sockets::satouser(const irc::sockets::sockaddrs* sa) {
 237         char buffer[MAXBUF];
 238         if (sa->sa.sa_family == AF_INET)
 239         {
 240                 if (sa->in4.sin_addr.s_addr == 0)
 241                 {
 242                         sprintf(buffer, "*:%u", ntohs(sa->in4.sin_port));
 243                 }
 244                 else
 245                 {
 246                         const uint8_t* bits = reinterpret_cast<const uint8_t*>(&sa->in4.sin_addr);
 247                         sprintf(buffer, "%d.%d.%d.%d:%u", bits[0], bits[1], bits[2], bits[3], ntohs(sa->in4.sin_port));
 248                 }
 249         }
 250         else if (sa->sa.sa_family == AF_INET6)
 251         {
 252                 if (!memcmp(all_zero, &sa->in6.sin6_addr, 16))
 253                 {
 254                         sprintf(buffer, "*:%u", ntohs(sa->in6.sin6_port));
 255                 }
 256                 else
 257                 {
 258                         buffer[0] = '[';
 259                         if (!inet_ntop(AF_INET6, &sa->in6.sin6_addr, buffer+1, MAXBUF - 10))
 260                                 return "<unknown>"; // should never happen, buffer is large enough
 261                         int len = strlen(buffer);
 262                         // no need for snprintf, buffer has at least 9 chars left, max short len = 5
 263                         sprintf(buffer + len, "]:%u", ntohs(sa->in6.sin6_port));
 264                 }
 265         }
 266         else
 267                 return "<unknown>";
 268         return std::string(buffer);
 269 }
 270
 271 int irc::sockets::sa_size(const irc::sockets::sockaddrs& sa)
 272 {
 273         if (sa.sa.sa_family == AF_INET)
 274                 return sizeof(sa.in4);
 275         if (sa.sa.sa_family == AF_INET6)
 276                 return sizeof(sa.in6);
 277         return 0;
 278 }