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 InspSocket* socket_ref[MAX_DESCRIPTORS];
  32
  33 /** This will bind a socket to a port. It works for UDP/TCP.
  34  * If a hostname is given to bind to, the function will first
  35  * attempt to resolve the hostname, then bind to the IP the
  36  * hostname resolves to. This is a blocking lookup blocking for
  37  * a maximum of one second before it times out, using the DNS
  38  * server specified in the configuration file.
  39  */
  40 bool BindSocket(int sockfd, insp_sockaddr client, insp_sockaddr server, int port, char* addr)
  41 {
  42         memset(&server,0,sizeof(server));
  43         insp_inaddr addy;
  44         bool resolved = false;
  45         char resolved_addr[128];
  46
  47         if (*addr == '*')
  48                 *addr = 0;
  49
  50         if (*addr && !inet_aton(addr,&addy))
  51         {
  52                 /* If they gave a hostname, bind to the IP it resolves to */
  53                 if (CleanAndResolve(resolved_addr, addr, true))
  54                 {
  55                         inet_aton(resolved_addr,&addy);
  56                         log(DEFAULT,"Resolved binding '%s' -> '%s'",addr,resolved_addr);
  57                         server.sin_addr = addy;
  58                         resolved = true;
  59                 }
  60                 else
  61                 {
  62                         log(DEFAULT,"WARNING: Could not resolve '%s' to an IP for binding to on port %d",addr,port);
  63                         return false;
  64                 }
  65         }
  66         server.sin_family = AF_INET;
  67         if (!resolved)
  68         {
  69                 if (!*addr)
  70                 {
  71                         server.sin_addr.s_addr = htonl(INADDR_ANY);
  72                 }
  73                 else
  74                 {
  75                         server.sin_addr = addy;
  76                 }
  77         }
  78         server.sin_port = htons(port);
  79         if (bind(sockfd,(struct sockaddr*)&server,sizeof(server)) < 0)
  80         {
  81                 return false;
  82         }
  83         else
  84         {
  85                 log(DEBUG,"Bound port %s:%d",*addr ? addr : "*",port);
  86                 if (listen(sockfd, Config->MaxConn) == -1)
  87                 {
  88                         log(DEFAULT,"ERROR in listen(): %s",strerror(errno));
  89                         return false;
  90                 }
  91                 else
  92                 {
  93                         NonBlocking(sockfd);
  94                         return true;
  95                 }
  96         }
  97 }
  98
  99
 100 // Open a TCP Socket
 101 int OpenTCPSocket()
 102 {
 103         int sockfd;
 104         int on = 1;
 105         struct linger linger = { 0 };
 106
 107         if ((sockfd = socket (AF_INET, SOCK_STREAM, 0)) < 0)
 108         {
 109                 log(DEFAULT,"Error creating TCP socket: %s",strerror(errno));
 110                 return (ERROR);
 111         }
 112         else
 113         {
 114                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 115                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
 116                 linger.l_onoff = 1;
 117                 linger.l_linger = 1;
 118                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &linger,sizeof(linger));
 119                 return (sockfd);
 120         }
 121 }
 122
 123 bool HasPort(int port, char* addr)
 124 {
 125         for (int count = 0; count < ServerInstance->stats->BoundPortCount; count++)
 126         {
 127                 if ((port == Config->ports[count]) && (!strcasecmp(Config->addrs[count],addr)))
 128                 {
 129                         return true;
 130                 }
 131         }
 132         return false;
 133 }
 134
 135 int BindPorts(bool bail)
 136 {
 137         char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF];
 138         insp_sockaddr client, server;
 139         int clientportcount = 0;
 140         int BoundPortCount = 0;
 141
 142         if (!bail)
 143         {
 144                 int InitialPortCount = ServerInstance->stats->BoundPortCount;
 145                 log(DEBUG,"Initial port count: %d",InitialPortCount);
 146
 147                 for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 148                 {
 149                         Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 150                         Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 151                         Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 152
 153                         if (((!*Type) || (!strcmp(Type,"clients"))) && (!HasPort(atoi(configToken),Addr)))
 154                         {
 155                                 // modules handle server bind types now
 156                                 Config->ports[clientportcount+InitialPortCount] = atoi(configToken);
 157                                 if (*Addr == '*')
 158                                         *Addr = 0;
 159
 160                                 strlcpy(Config->addrs[clientportcount+InitialPortCount],Addr,256);
 161                                 clientportcount++;
 162                                 log(DEBUG,"NEW binding %s:%s [%s] from config",Addr,configToken, Type);
 163                         }
 164                 }
 165                 int PortCount = clientportcount;
 166                 if (PortCount)
 167                 {
 168                         for (int count = InitialPortCount; count < InitialPortCount + PortCount; count++)
 169                         {
 170                                 if ((openSockfd[count] = OpenTCPSocket()) == ERROR)
 171                                 {
 172                                         log(DEBUG,"Bad fd %d binding port [%s:%d]",openSockfd[count],Config->addrs[count],Config->ports[count]);
 173                                         return ERROR;
 174                                 }
 175                                 if (!BindSocket(openSockfd[count],client,server,Config->ports[count],Config->addrs[count]))
 176                                 {
 177                                         log(DEFAULT,"Failed to bind port [%s:%d]: %s",Config->addrs[count],Config->ports[count],strerror(errno));
 178                                 }
 179                                 else
 180                                 {
 181                                         /* Associate the new open port with a slot in the socket engine */
 182                                         ServerInstance->SE->AddFd(openSockfd[count],true,X_LISTEN);
 183                                         BoundPortCount++;
 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 ((openSockfd[BoundPortCount] = OpenTCPSocket()) == ERROR)
 224                 {
 225                         log(DEBUG,"Bad fd %d binding port [%s:%d]",openSockfd[BoundPortCount],Config->addrs[count],Config->ports[count]);
 226                         return ERROR;
 227                 }
 228
 229                 if (!BindSocket(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 }