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, &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, &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         char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF], Desc[MAXBUF];
 109         int bound = 0;
 110         std::vector<ListenSocketBase*> old_ports(ports.begin(), ports.end());
 111
 112         for (int count = 0; count < Config->ConfValueEnum("bind"); count++)
 113         {
 114                 Config->ConfValue("bind", "port", count, configToken, MAXBUF);
 115                 Config->ConfValue("bind", "address", count, Addr, MAXBUF);
 116                 Config->ConfValue("bind", "type", count, Type, MAXBUF);
 117                 Config->ConfValue("bind", "ssl", count, Desc, MAXBUF);
 118
 119                 if (strncmp(Addr, "::ffff:", 7) == 0)
 120                         this->Logs->Log("SOCKET",DEFAULT, "Using 4in6 (::ffff:) isn't recommended. You should bind IPv4 addresses directly instead.");
 121
 122                 if ((!*Type) || (!strcmp(Type,"clients")))
 123                 {
 124                         irc::portparser portrange(configToken, false);
 125                         int portno = -1;
 126                         while (0 != (portno = portrange.GetToken()))
 127                         {
 128                                 if (*Addr == '*')
 129                                         *Addr = 0;
 130
 131                                 irc::sockets::sockaddrs bindspec;
 132                                 irc::sockets::aptosa(Addr, portno, &bindspec);
 133                                 std::string bind_readable = irc::sockets::satouser(&bindspec);
 134
 135                                 bool skip = false;
 136                                 for (std::vector<ListenSocketBase *>::iterator n = old_ports.begin(); n != old_ports.end(); ++n)
 137                                 {
 138                                         if ((*n)->GetBindDesc() == bind_readable)
 139                                         {
 140                                                 skip = true;
 141                                                 old_ports.erase(n);
 142                                                 break;
 143                                         }
 144                                 }
 145                                 if (!skip)
 146                                 {
 147                                         ClientListenSocket *ll = new ClientListenSocket(portno, Addr, "clients", *Desc ? Desc : "plaintext");
 148                                         if (ll->GetFd() > -1)
 149                                         {
 150                                                 bound++;
 151                                                 ports.push_back(ll);
 152                                         }
 153                                         else
 154                                         {
 155                                                 failed_ports.push_back(std::make_pair(bind_readable, strerror(errno)));
 156                                                 delete ll;
 157                                         }
 158                                 }
 159                         }
 160                 }
 161         }
 162
 163         std::vector<ListenSocketBase *>::iterator n = ports.begin();
 164         for (std::vector<ListenSocketBase *>::iterator o = old_ports.begin(); o != old_ports.end(); ++o)
 165         {
 166                 while (n != ports.end() && *n != *o)
 167                         n++;
 168                 if (n == ports.end())
 169                 {
 170                         this->Logs->Log("SOCKET",ERROR,"Port bindings slipped out of vector, aborting close!");
 171                         break;
 172                 }
 173
 174                 this->Logs->Log("SOCKET",DEFAULT, "Port binding %s was removed from the config file, closing.",
 175                         (*n)->GetBindDesc().c_str());
 176                 delete *n;
 177
 178                 // this keeps the iterator valid, pointing to the next element
 179                 n = ports.erase(n);
 180         }
 181
 182         return bound;
 183 }
 184
 185 bool irc::sockets::aptosa(const std::string& addr, int port, irc::sockets::sockaddrs* sa)
 186 {
 187         memset(sa, 0, sizeof(*sa));
 188         if (addr.empty())
 189         {
 190 #ifdef IPV6
 191                 sa->in6.sin6_family = AF_INET6;
 192                 sa->in6.sin6_port = htons(port);
 193 #else
 194                 sa->in4.sin_family = AF_INET;
 195                 sa->in4.sin_port = htons(port);
 196 #endif
 197                 return true;
 198         }
 199         else if (inet_pton(AF_INET, addr.c_str(), &sa->in4.sin_addr) > 0)
 200         {
 201                 sa->in4.sin_family = AF_INET;
 202                 sa->in4.sin_port = htons(port);
 203                 return true;
 204         }
 205         else if (inet_pton(AF_INET6, addr.c_str(), &sa->in6.sin6_addr) > 0)
 206         {
 207                 sa->in6.sin6_family = AF_INET6;
 208                 sa->in6.sin6_port = htons(port);
 209                 return true;
 210         }
 211         return false;
 212 }
 213
 214 bool irc::sockets::satoap(const irc::sockets::sockaddrs* sa, std::string& addr, int &port) {
 215         char addrv[INET6_ADDRSTRLEN+1];
 216         if (sa->sa.sa_family == AF_INET)
 217         {
 218                 if (!inet_ntop(AF_INET, &sa->in4.sin_addr, addrv, sizeof(addrv)))
 219                         return false;
 220                 addr = addrv;
 221                 port = ntohs(sa->in4.sin_port);
 222                 return true;
 223         }
 224         else if (sa->sa.sa_family == AF_INET6)
 225         {
 226                 if (!inet_ntop(AF_INET6, &sa->in6.sin6_addr, addrv, sizeof(addrv)))
 227                         return false;
 228                 addr = addrv;
 229                 port = ntohs(sa->in6.sin6_port);
 230                 return true;
 231         }
 232         return false;
 233 }
 234
 235 static const char all_zero[16] = {0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 };
 236
 237 std::string irc::sockets::satouser(const irc::sockets::sockaddrs* sa) {
 238         char buffer[MAXBUF];
 239         if (sa->sa.sa_family == AF_INET)
 240         {
 241                 if (sa->in4.sin_addr.s_addr == 0)
 242                 {
 243                         sprintf(buffer, "*:%u", ntohs(sa->in4.sin_port));
 244                 }
 245                 else
 246                 {
 247                         const uint8_t* bits = reinterpret_cast<const uint8_t*>(&sa->in4.sin_addr);
 248                         sprintf(buffer, "%d.%d.%d.%d:%u", bits[0], bits[1], bits[2], bits[3], ntohs(sa->in4.sin_port));
 249                 }
 250         }
 251         else if (sa->sa.sa_family == AF_INET6)
 252         {
 253                 if (!memcmp(all_zero, &sa->in6.sin6_addr, 16))
 254                 {
 255                         sprintf(buffer, "*:%u", ntohs(sa->in6.sin6_port));
 256                 }
 257                 else
 258                 {
 259                         buffer[0] = '[';
 260                         if (!inet_ntop(AF_INET6, &sa->in6.sin6_addr, buffer+1, MAXBUF - 10))
 261                                 return "<unknown>"; // should never happen, buffer is large enough
 262                         int len = strlen(buffer);
 263                         // no need for snprintf, buffer has at least 9 chars left, max short len = 5
 264                         sprintf(buffer + len, "]:%u", ntohs(sa->in6.sin6_port));
 265                 }
 266         }
 267         else
 268                 return "<unknown>";
 269         return std::string(buffer);
 270 }
 271
 272 int irc::sockets::sa_size(const irc::sockets::sockaddrs& sa)
 273 {
 274         if (sa.sa.sa_family == AF_INET)
 275                 return sizeof(sa.in4);
 276         if (sa.sa.sa_family == AF_INET6)
 277                 return sizeof(sa.in6);
 278         return 0;
 279 }