src/socket.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 #include <string>
  18 #include "configreader.h"
  19 #include "socket.h"
  20 #include "inspircd.h"
  21 #include "inspstring.h"
  22 #include "helperfuncs.h"
  23 #include "socketengine.h"
  24 #include "message.h"
  25
  26 extern InspIRCd* ServerInstance;
  27 extern ServerConfig* Config;
  28 extern time_t TIME;
  29
  30 /** This will bind a socket to a port. It works for UDP/TCP.
  31  * If a hostname is given to bind to, the function will first
  32  * attempt to resolve the hostname, then bind to the IP the
  33  * hostname resolves to. This is a blocking lookup blocking for
  34  * a maximum of one second before it times out, using the DNS
  35  * server specified in the configuration file.
  36  */
  37 bool BindSocket(int sockfd, insp_sockaddr client, insp_sockaddr server, int port, char* addr)
  38 {
  39         memset(&server,0,sizeof(server));
  40         insp_inaddr addy;
  41         bool resolved = false;
  42         char resolved_addr[128];
  43
  44         if (*addr == '*')
  45                 *addr = 0;
  46
  47         if (*addr && !inet_aton(addr,&addy))
  48         {
  49                 /* If they gave a hostname, bind to the IP it resolves to */
  50                 if (CleanAndResolve(resolved_addr, addr, true, 1))
  51                 {
  52                         inet_aton(resolved_addr,&addy);
  53                         log(DEFAULT,"Resolved binding '%s' -> '%s'",addr,resolved_addr);
  54                         server.sin_addr = addy;
  55                         resolved = true;
  56                 }
  57                 else
  58                 {
  59                         log(DEFAULT,"WARNING: Could not resolve '%s' to an IP for binding to on port %d",addr,port);
  60                         return false;
  61                 }
  62         }
  63         server.sin_family = AF_FAMILY;
  64         if (!resolved)
  65         {
  66                 if (!*addr)
  67                 {
  68                         server.sin_addr.s_addr = htonl(INADDR_ANY);
  69                 }
  70                 else
  71                 {
  72                         server.sin_addr = addy;
  73                 }
  74         }
  75         server.sin_port = htons(port);
  76         if (bind(sockfd,(struct sockaddr*)&server,sizeof(server)) < 0)
  77         {
  78                 return false;
  79         }
  80         else
  81         {
  82                 log(DEBUG,"Bound port %s:%d",*addr ? addr : "*",port);
  83                 if (listen(sockfd, Config->MaxConn) == -1)
  84                 {
  85                         log(DEFAULT,"ERROR in listen(): %s",strerror(errno));
  86                         return false;
  87                 }
  88                 else
  89                 {
  90                         NonBlocking(sockfd);
  91                         return true;
  92                 }
  93         }
  94 }
  95
  96
  97 // Open a TCP Socket
  98 int OpenTCPSocket()
  99 {
 100         int sockfd;
 101         int on = 1;
 102         struct linger linger = { 0 };
 103
 104         if ((sockfd = socket (AF_FAMILY, SOCK_STREAM, 0)) < 0)
 105         {
 106                 log(DEFAULT,"Error creating TCP socket: %s",strerror(errno));
 107                 return (ERROR);
 108         }
 109         else
 110         {
 111                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 112                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
 113                 linger.l_onoff = 1;
 114                 linger.l_linger = 1;
 115                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &linger,sizeof(linger));
 116                 return (sockfd);
 117         }
 118 }
 119
 120 bool HasPort(int port, char* addr)
 121 {
 122         for (unsigned long count = 0; count < ServerInstance->stats->BoundPortCount; count++)
 123         {
 124                 if ((port == Config->ports[count]) && (!strcasecmp(Config->addrs[count],addr)))
 125                 {
 126                         return true;
 127                 }
 128         }
 129         return false;
 130 }
 131
 132 int BindPorts(bool bail)
 133 {
 134         char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF];
 135         insp_sockaddr client, server;
 136         int clientportcount = 0;
 137         int BoundPortCount = 0;
 138
 139         if (!bail)
 140         {
 141                 int InitialPortCount = ServerInstance->stats->BoundPortCount;
 142                 log(DEBUG,"Initial port count: %d",InitialPortCount);
 143
 144                 for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 145                 {
 146                         Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 147                         Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 148                         Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 149
 150                         if (((!*Type) || (!strcmp(Type,"clients"))) && (!HasPort(atoi(configToken),Addr)))
 151                         {
 152                                 // modules handle server bind types now
 153                                 Config->ports[clientportcount+InitialPortCount] = atoi(configToken);
 154                                 if (*Addr == '*')
 155                                         *Addr = 0;
 156
 157                                 strlcpy(Config->addrs[clientportcount+InitialPortCount],Addr,256);
 158                                 clientportcount++;
 159                                 log(DEBUG,"NEW binding %s:%s [%s] from config",Addr,configToken, Type);
 160                         }
 161                 }
 162                 int PortCount = clientportcount;
 163                 if (PortCount)
 164                 {
 165                         for (int count = InitialPortCount; count < InitialPortCount + PortCount; count++)
 166                         {
 167                                 if ((Config->openSockfd[count] = OpenTCPSocket()) == ERROR)
 168                                 {
 169                                         log(DEBUG,"Bad fd %d binding port [%s:%d]",Config->openSockfd[count],Config->addrs[count],Config->ports[count]);
 170                                         return ERROR;
 171                                 }
 172                                 if (!BindSocket(Config->openSockfd[count],client,server,Config->ports[count],Config->addrs[count]))
 173                                 {
 174                                         log(DEFAULT,"Failed to bind port [%s:%d]: %s",Config->addrs[count],Config->ports[count],strerror(errno));
 175                                 }
 176                                 else
 177                                 {
 178                                         /* Associate the new open port with a slot in the socket engine */
 179                                         if (Config->openSockfd[count] > -1)
 180                                         {
 181                                                 ServerInstance->SE->AddFd(Config->openSockfd[count],true,X_LISTEN);
 182                                                 BoundPortCount++;
 183                                         }
 184                                 }
 185                         }
 186                         return InitialPortCount + BoundPortCount;
 187                 }
 188                 else
 189                 {
 190                         log(DEBUG,"There is nothing new to bind!");
 191                 }
 192                 return InitialPortCount;
 193         }
 194
 195         for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 196         {
 197                 Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 198                 Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 199                 Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 200
 201                 if ((!*Type) || (!strcmp(Type,"clients")))
 202                 {
 203                         // modules handle server bind types now
 204                         Config->ports[clientportcount] = atoi(configToken);
 205
 206                         // If the client put bind "*", this is an unrealism.
 207                         // We don't actually support this as documented, but
 208                         // i got fed up of people trying it, so now it converts
 209                         // it to an empty string meaning the same 'bind to all'.
 210                         if (*Addr == '*')
 211                                 *Addr = 0;
 212
 213                         strlcpy(Config->addrs[clientportcount],Addr,256);
 214                         clientportcount++;
 215                         log(DEBUG,"Binding %s:%s [%s] from config",Addr,configToken, Type);
 216                 }
 217         }
 218
 219         int PortCount = clientportcount;
 220
 221         for (int count = 0; count < PortCount; count++)
 222         {
 223                 if ((Config->openSockfd[BoundPortCount] = OpenTCPSocket()) == ERROR)
 224                 {
 225                         log(DEBUG,"Bad fd %d binding port [%s:%d]",Config->openSockfd[BoundPortCount],Config->addrs[count],Config->ports[count]);
 226                         return ERROR;
 227                 }
 228
 229                 if (!BindSocket(Config->openSockfd[BoundPortCount],client,server,Config->ports[count],Config->addrs[count]))
 230                 {
 231                         log(DEFAULT,"Failed to bind port [%s:%d]: %s",Config->addrs[count],Config->ports[count],strerror(errno));
 232                 }
 233                 else
 234                 {
 235                         /* well we at least bound to one socket so we'll continue */
 236                         BoundPortCount++;
 237                 }
 238         }
 239
 240         /* if we didn't bind to anything then abort */
 241         if (!BoundPortCount)
 242         {
 243                 log(DEFAULT,"No ports bound, bailing!");
 244                 printf("\nERROR: Could not bind any of %d ports! Please check your configuration.\n\n", PortCount);
 245                 return ERROR;
 246         }
 247
 248         return BoundPortCount;
 249 }