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                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
  97                 linger.l_onoff = 1;
  98                 linger.l_linger = 1;
  99 #ifdef WINDOWS
 100                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (char*)&on, sizeof(on));
 101                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, (char*)&linger, sizeof(linger));
 102 #elif
 103                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 104                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger));
 105 #endif
 106                 return (sockfd);
 107         }
 108 }
 109
 110 // XXX: it would be VERY nice to genericize this so all listen stuff (server/client) could use the one function. -- w00t
 111 int InspIRCd::BindPorts(FailedPortList &failed_ports)
 112 {
 113         char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF], Desc[MAXBUF];
 114         int bound = 0;
 115         std::vector<ListenSocketBase*> old_ports(ports.begin(), ports.end());
 116
 117         for (int count = 0; count < Config->ConfValueEnum("bind"); count++)
 118         {
 119                 Config->ConfValue("bind", "port", count, configToken, MAXBUF);
 120                 Config->ConfValue("bind", "address", count, Addr, MAXBUF);
 121                 Config->ConfValue("bind", "type", count, Type, MAXBUF);
 122                 Config->ConfValue("bind", "ssl", count, Desc, MAXBUF);
 123
 124                 if (strncmp(Addr, "::ffff:", 7) == 0)
 125                         this->Logs->Log("SOCKET",DEFAULT, "Using 4in6 (::ffff:) isn't recommended. You should bind IPv4 addresses directly instead.");
 126
 127                 if ((!*Type) || (!strcmp(Type,"clients")))
 128                 {
 129                         irc::portparser portrange(configToken, false);
 130                         int portno = -1;
 131                         while (0 != (portno = portrange.GetToken()))
 132                         {
 133                                 if (*Addr == '*')
 134                                         *Addr = 0;
 135
 136                                 irc::sockets::sockaddrs bindspec;
 137                                 irc::sockets::aptosa(Addr, portno, &bindspec);
 138                                 std::string bind_readable = irc::sockets::satouser(&bindspec);
 139
 140                                 bool skip = false;
 141                                 for (std::vector<ListenSocketBase *>::iterator n = old_ports.begin(); n != old_ports.end(); ++n)
 142                                 {
 143                                         if ((*n)->GetBindDesc() == bind_readable)
 144                                         {
 145                                                 skip = true;
 146                                                 old_ports.erase(n);
 147                                                 break;
 148                                         }
 149                                 }
 150                                 if (!skip)
 151                                 {
 152                                         ClientListenSocket *ll = new ClientListenSocket(portno, Addr, "clients", *Desc ? Desc : "plaintext");
 153                                         if (ll->GetFd() > -1)
 154                                         {
 155                                                 bound++;
 156                                                 ports.push_back(ll);
 157                                         }
 158                                         else
 159                                         {
 160                                                 failed_ports.push_back(std::make_pair(bind_readable, strerror(errno)));
 161                                                 delete ll;
 162                                         }
 163                                 }
 164                         }
 165                 }
 166         }
 167
 168         std::vector<ListenSocketBase *>::iterator n = ports.begin();
 169         for (std::vector<ListenSocketBase *>::iterator o = old_ports.begin(); o != old_ports.end(); ++o)
 170         {
 171                 while (n != ports.end() && *n != *o)
 172                         n++;
 173                 if (n == ports.end())
 174                 {
 175                         this->Logs->Log("SOCKET",ERROR,"Port bindings slipped out of vector, aborting close!");
 176                         break;
 177                 }
 178
 179                 this->Logs->Log("SOCKET",DEFAULT, "Port binding %s was removed from the config file, closing.",
 180                         (*n)->GetBindDesc().c_str());
 181                 delete *n;
 182
 183                 // this keeps the iterator valid, pointing to the next element
 184                 n = ports.erase(n);
 185         }
 186
 187         return bound;
 188 }
 189
 190 bool irc::sockets::aptosa(const std::string& addr, int port, irc::sockets::sockaddrs* sa)
 191 {
 192         memset(sa, 0, sizeof(*sa));
 193         if (addr.empty())
 194         {
 195 #ifdef IPV6
 196                 sa->in6.sin6_family = AF_INET6;
 197                 sa->in6.sin6_port = htons(port);
 198 #else
 199                 sa->in4.sin_family = AF_INET;
 200                 sa->in4.sin_port = htons(port);
 201 #endif
 202                 return true;
 203         }
 204         else if (inet_pton(AF_INET, addr.c_str(), &sa->in4.sin_addr) > 0)
 205         {
 206                 sa->in4.sin_family = AF_INET;
 207                 sa->in4.sin_port = htons(port);
 208                 return true;
 209         }
 210         else if (inet_pton(AF_INET6, addr.c_str(), &sa->in6.sin6_addr) > 0)
 211         {
 212                 sa->in6.sin6_family = AF_INET6;
 213                 sa->in6.sin6_port = htons(port);
 214                 return true;
 215         }
 216         return false;
 217 }
 218
 219 bool irc::sockets::satoap(const irc::sockets::sockaddrs* sa, std::string& addr, int &port) {
 220         char addrv[INET6_ADDRSTRLEN+1];
 221         if (sa->sa.sa_family == AF_INET)
 222         {
 223                 if (!inet_ntop(AF_INET, &sa->in4.sin_addr, addrv, sizeof(addrv)))
 224                         return false;
 225                 addr = addrv;
 226                 port = ntohs(sa->in4.sin_port);
 227                 return true;
 228         }
 229         else if (sa->sa.sa_family == AF_INET6)
 230         {
 231                 if (!inet_ntop(AF_INET6, &sa->in6.sin6_addr, addrv, sizeof(addrv)))
 232                         return false;
 233                 addr = addrv;
 234                 port = ntohs(sa->in6.sin6_port);
 235                 return true;
 236         }
 237         return false;
 238 }
 239
 240 static const char all_zero[16] = {0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 };
 241
 242 std::string irc::sockets::satouser(const irc::sockets::sockaddrs* sa) {
 243         char buffer[MAXBUF];
 244         if (sa->sa.sa_family == AF_INET)
 245         {
 246                 if (sa->in4.sin_addr.s_addr == 0)
 247                 {
 248                         sprintf(buffer, "*:%u", ntohs(sa->in4.sin_port));
 249                 }
 250                 else
 251                 {
 252                         const uint8_t* bits = reinterpret_cast<const uint8_t*>(&sa->in4.sin_addr);
 253                         sprintf(buffer, "%d.%d.%d.%d:%u", bits[0], bits[1], bits[2], bits[3], ntohs(sa->in4.sin_port));
 254                 }
 255         }
 256         else if (sa->sa.sa_family == AF_INET6)
 257         {
 258                 if (!memcmp(all_zero, &sa->in6.sin6_addr, 16))
 259                 {
 260                         sprintf(buffer, "*:%u", ntohs(sa->in6.sin6_port));
 261                 }
 262                 else
 263                 {
 264                         buffer[0] = '[';
 265                         if (!inet_ntop(AF_INET6, &sa->in6.sin6_addr, buffer+1, MAXBUF - 10))
 266                                 return "<unknown>"; // should never happen, buffer is large enough
 267                         int len = strlen(buffer);
 268                         // no need for snprintf, buffer has at least 9 chars left, max short len = 5
 269                         sprintf(buffer + len, "]:%u", ntohs(sa->in6.sin6_port));
 270                 }
 271         }
 272         else
 273                 return "<unknown>";
 274         return std::string(buffer);
 275 }
 276
 277 int irc::sockets::sa_size(const irc::sockets::sockaddrs& sa)
 278 {
 279         if (sa.sa.sa_family == AF_INET)
 280                 return sizeof(sa.in4);
 281         if (sa.sa.sa_family == AF_INET6)
 282                 return sizeof(sa.in6);
 283         return 0;
 284 }