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 extern int openSockfd[MAX_DESCRIPTORS];
  30
  31 /** This will bind a socket to a port. It works for UDP/TCP.
  32  * If a hostname is given to bind to, the function will first
  33  * attempt to resolve the hostname, then bind to the IP the
  34  * hostname resolves to. This is a blocking lookup blocking for
  35  * a maximum of one second before it times out, using the DNS
  36  * server specified in the configuration file.
  37  */
  38 bool BindSocket(int sockfd, insp_sockaddr client, insp_sockaddr server, int port, char* addr)
  39 {
  40         memset(&server,0,sizeof(server));
  41         insp_inaddr addy;
  42         bool resolved = false;
  43         char resolved_addr[128];
  44
  45         if (*addr == '*')
  46                 *addr = 0;
  47
  48         if (*addr && !inet_aton(addr,&addy))
  49         {
  50                 /* If they gave a hostname, bind to the IP it resolves to */
  51                 if (CleanAndResolve(resolved_addr, addr, true))
  52                 {
  53                         inet_aton(resolved_addr,&addy);
  54                         log(DEFAULT,"Resolved binding '%s' -> '%s'",addr,resolved_addr);
  55                         server.sin_addr = addy;
  56                         resolved = true;
  57                 }
  58                 else
  59                 {
  60                         log(DEFAULT,"WARNING: Could not resolve '%s' to an IP for binding to on port %d",addr,port);
  61                         return false;
  62                 }
  63         }
  64         server.sin_family = AF_INET;
  65         if (!resolved)
  66         {
  67                 if (!*addr)
  68                 {
  69                         server.sin_addr.s_addr = htonl(INADDR_ANY);
  70                 }
  71                 else
  72                 {
  73                         server.sin_addr = addy;
  74                 }
  75         }
  76         server.sin_port = htons(port);
  77         if (bind(sockfd,(struct sockaddr*)&server,sizeof(server)) < 0)
  78         {
  79                 return false;
  80         }
  81         else
  82         {
  83                 log(DEBUG,"Bound port %s:%d",*addr ? addr : "*",port);
  84                 if (listen(sockfd, Config->MaxConn) == -1)
  85                 {
  86                         log(DEFAULT,"ERROR in listen(): %s",strerror(errno));
  87                         return false;
  88                 }
  89                 else
  90                 {
  91                         NonBlocking(sockfd);
  92                         return true;
  93                 }
  94         }
  95 }
  96
  97
  98 // Open a TCP Socket
  99 int OpenTCPSocket()
 100 {
 101         int sockfd;
 102         int on = 1;
 103         struct linger linger = { 0 };
 104
 105         if ((sockfd = socket (AF_INET, SOCK_STREAM, 0)) < 0)
 106         {
 107                 log(DEFAULT,"Error creating TCP socket: %s",strerror(errno));
 108                 return (ERROR);
 109         }
 110         else
 111         {
 112                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 113                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
 114                 linger.l_onoff = 1;
 115                 linger.l_linger = 1;
 116                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &linger,sizeof(linger));
 117                 return (sockfd);
 118         }
 119 }
 120
 121 bool HasPort(int port, char* addr)
 122 {
 123         for (int count = 0; count < ServerInstance->stats->BoundPortCount; count++)
 124         {
 125                 if ((port == Config->ports[count]) && (!strcasecmp(Config->addrs[count],addr)))
 126                 {
 127                         return true;
 128                 }
 129         }
 130         return false;
 131 }
 132
 133 int BindPorts(bool bail)
 134 {
 135         char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF];
 136         insp_sockaddr client, server;
 137         int clientportcount = 0;
 138         int BoundPortCount = 0;
 139
 140         if (!bail)
 141         {
 142                 int InitialPortCount = ServerInstance->stats->BoundPortCount;
 143                 log(DEBUG,"Initial port count: %d",InitialPortCount);
 144
 145                 for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 146                 {
 147                         Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 148                         Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 149                         Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 150
 151                         if (((!*Type) || (!strcmp(Type,"clients"))) && (!HasPort(atoi(configToken),Addr)))
 152                         {
 153                                 // modules handle server bind types now
 154                                 Config->ports[clientportcount+InitialPortCount] = atoi(configToken);
 155                                 if (*Addr == '*')
 156                                         *Addr = 0;
 157
 158                                 strlcpy(Config->addrs[clientportcount+InitialPortCount],Addr,256);
 159                                 clientportcount++;
 160                                 log(DEBUG,"NEW binding %s:%s [%s] from config",Addr,configToken, Type);
 161                         }
 162                 }
 163                 int PortCount = clientportcount;
 164                 if (PortCount)
 165                 {
 166                         for (int count = InitialPortCount; count < InitialPortCount + PortCount; count++)
 167                         {
 168                                 if ((openSockfd[count] = OpenTCPSocket()) == ERROR)
 169                                 {
 170                                         log(DEBUG,"Bad fd %d binding port [%s:%d]",openSockfd[count],Config->addrs[count],Config->ports[count]);
 171                                         return ERROR;
 172                                 }
 173                                 if (!BindSocket(openSockfd[count],client,server,Config->ports[count],Config->addrs[count]))
 174                                 {
 175                                         log(DEFAULT,"Failed to bind port [%s:%d]: %s",Config->addrs[count],Config->ports[count],strerror(errno));
 176                                 }
 177                                 else
 178                                 {
 179                                         /* Associate the new open port with a slot in the socket engine */
 180                                         if (openSockfd[count] > -1)
 181                                         {
 182                                                 ServerInstance->SE->AddFd(openSockfd[count],true,X_LISTEN);
 183                                                 BoundPortCount++;
 184                                         }
 185                                 }
 186                         }
 187                         return InitialPortCount + BoundPortCount;
 188                 }
 189                 else
 190                 {
 191                         log(DEBUG,"There is nothing new to bind!");
 192                 }
 193                 return InitialPortCount;
 194         }
 195
 196         for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 197         {
 198                 Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 199                 Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 200                 Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 201
 202                 if ((!*Type) || (!strcmp(Type,"clients")))
 203                 {
 204                         // modules handle server bind types now
 205                         Config->ports[clientportcount] = atoi(configToken);
 206
 207                         // If the client put bind "*", this is an unrealism.
 208                         // We don't actually support this as documented, but
 209                         // i got fed up of people trying it, so now it converts
 210                         // it to an empty string meaning the same 'bind to all'.
 211                         if (*Addr == '*')
 212                                 *Addr = 0;
 213
 214                         strlcpy(Config->addrs[clientportcount],Addr,256);
 215                         clientportcount++;
 216                         log(DEBUG,"Binding %s:%s [%s] from config",Addr,configToken, Type);
 217                 }
 218         }
 219
 220         int PortCount = clientportcount;
 221
 222         for (int count = 0; count < PortCount; count++)
 223         {
 224                 if ((openSockfd[BoundPortCount] = OpenTCPSocket()) == ERROR)
 225                 {
 226                         log(DEBUG,"Bad fd %d binding port [%s:%d]",openSockfd[BoundPortCount],Config->addrs[count],Config->ports[count]);
 227                         return ERROR;
 228                 }
 229
 230                 if (!BindSocket(openSockfd[BoundPortCount],client,server,Config->ports[count],Config->addrs[count]))
 231                 {
 232                         log(DEFAULT,"Failed to bind port [%s:%d]: %s",Config->addrs[count],Config->ports[count],strerror(errno));
 233                 }
 234                 else
 235                 {
 236                         /* well we at least bound to one socket so we'll continue */
 237                         BoundPortCount++;
 238                 }
 239         }
 240
 241         /* if we didn't bind to anything then abort */
 242         if (!BoundPortCount)
 243         {
 244                 log(DEFAULT,"No ports bound, bailing!");
 245                 printf("\nERROR: Could not bind any of %d ports! Please check your configuration.\n\n", PortCount);
 246                 return ERROR;
 247         }
 248
 249         return BoundPortCount;
 250 }