src/modules/m_spanningtree/capab.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "commands/cmd_whois.h"
  16 #include "commands/cmd_stats.h"
  17 #include "socket.h"
  18 #include "wildcard.h"
  19 #include "xline.h"
  20 #include "transport.h"
  21 #include "m_hash.h"
  22 #include "socketengine.h"
  23
  24 #include "m_spanningtree/main.h"
  25 #include "m_spanningtree/utils.h"
  26 #include "m_spanningtree/treeserver.h"
  27 #include "m_spanningtree/link.h"
  28 #include "m_spanningtree/treesocket.h"
  29 #include "m_spanningtree/resolvers.h"
  30 #include "m_spanningtree/handshaketimer.h"
  31
  32 /* $ModDep: m_spanningtree/timesynctimer.h m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h m_hash.h */
  33
  34 std::string TreeSocket::MyCapabilities()
  35 {
  36         std::vector<std::string> modlist = this->Instance->Modules->GetAllModuleNames(VF_COMMON);
  37         std::string capabilities;
  38         sort(modlist.begin(),modlist.end());
  39         for (unsigned int i = 0; i < modlist.size(); i++)
  40         {
  41                 if (i)
  42                         capabilities = capabilities + ",";
  43                 capabilities = capabilities + modlist[i];
  44         }
  45         return capabilities;
  46 }
  47
  48 void TreeSocket::SendCapabilities()
  49 {
  50         if (sentcapab)
  51                 return;
  52
  53         sentcapab = true;
  54         irc::commasepstream modulelist(MyCapabilities());
  55         this->WriteLine("CAPAB START");
  56
  57         /* Send module names, split at 509 length */
  58         std::string item;
  59         std::string line = "CAPAB MODULES ";
  60         while (modulelist.GetToken(item))
  61         {
  62                 if (line.length() + item.length() + 1 > 509)
  63                 {
  64                         this->WriteLine(line);
  65                         line = "CAPAB MODULES ";
  66                 }
  67
  68                 if (line != "CAPAB MODULES ")
  69                         line.append(",");
  70
  71                 line.append(item);
  72         }
  73         if (line != "CAPAB MODULES ")
  74                 this->WriteLine(line);
  75
  76         int ip6 = 0;
  77         int ip6support = 0;
  78 #ifdef IPV6
  79         ip6 = 1;
  80 #endif
  81 #ifdef SUPPORT_IP6LINKS
  82         ip6support = 1;
  83 #endif
  84         std::string extra;
  85         /* Do we have sha256 available? If so, we send a challenge */
  86         if (Utils->ChallengeResponse && (Instance->Modules->Find("m_sha256.so")))
  87         {
  88                 this->SetOurChallenge(RandString(20));
  89                 extra = " CHALLENGE=" + this->GetOurChallenge();
  90         }
  91
  92         this->WriteLine("CAPAB CAPABILITIES :NICKMAX="+ConvToStr(NICKMAX)+" HALFOP="+ConvToStr(this->Instance->Config->AllowHalfop)+" CHANMAX="+ConvToStr(CHANMAX)+" MAXMODES="+ConvToStr(MAXMODES)+" IDENTMAX="+ConvToStr(IDENTMAX)+" MAXQUIT="+ConvToStr(MAXQUIT)+" MAXTOPIC="+ConvToStr(MAXTOPIC)+" MAXKICK="+ConvToStr(MAXKICK)+" MAXGECOS="+ConvToStr(MAXGECOS)+" MAXAWAY="+ConvToStr(MAXAWAY)+" IP6NATIVE="+ConvToStr(ip6)+" IP6SUPPORT="+ConvToStr(ip6support)+" PROTOCOL="+ConvToStr(ProtocolVersion)+extra+" PREFIX="+Instance->Modes->BuildPrefixes()+" CHANMODES="+Instance->Modes->ChanModes()+" SVSPART=1");
  93
  94         this->WriteLine("CAPAB END");
  95 }
  96
  97 /* Check a comma seperated list for an item */
  98 bool TreeSocket::HasItem(const std::string &list, const std::string &item)
  99 {
 100         irc::commasepstream seplist(list);
 101         std::string item2;
 102
 103         while (seplist.GetToken(item2))
 104         {
 105                 if (item2 == item)
 106                         return true;
 107         }
 108         return false;
 109 }
 110
 111 /* Isolate and return the elements that are different between two comma seperated lists */
 112 std::string TreeSocket::ListDifference(const std::string &one, const std::string &two)
 113 {
 114         irc::commasepstream list_one(one);
 115         std::string item;
 116         std::string result;
 117         while (list_one.GetToken(item))
 118         {
 119                 if (!HasItem(two, item))
 120                 {
 121                         result.append(" ");
 122                         result.append(item);
 123                 }
 124         }
 125         return result;
 126 }
 127
 128 bool TreeSocket::Capab(const std::deque<std::string> &params)
 129 {
 130         if (params.size() < 1)
 131         {
 132                 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
 133                 return false;
 134         }
 135         if (params[0] == "START")
 136         {
 137                 this->ModuleList.clear();
 138                 this->CapKeys.clear();
 139         }
 140         else if (params[0] == "END")
 141         {
 142                 std::string reason;
 143                 int ip6support = 0;
 144 #ifdef SUPPORT_IP6LINKS
 145                 ip6support = 1;
 146 #endif
 147                 /* Compare ModuleList and check CapKeys...
 148                  * Maybe this could be tidier? -- Brain
 149                  */
 150                 if ((this->ModuleList != this->MyCapabilities()) && (this->ModuleList.length()))
 151                 {
 152                         std::string diff = ListDifference(this->ModuleList, this->MyCapabilities());
 153                         if (!diff.length())
 154                         {
 155                                 diff = "your server:" + ListDifference(this->MyCapabilities(), this->ModuleList);
 156                         }
 157                         else
 158                         {
 159                                 diff = "this server:" + diff;
 160                         }
 161                         if (diff.length() == 12)
 162                                 reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
 163                         else
 164                                 reason = "Modules loaded on these servers are not correctly matched, these modules are not loaded on " + diff;
 165                 }
 166
 167                 cap_validation valid_capab[] = {
 168                         {"Maximum nickname lengths differ or remote nickname length not specified", "NICKMAX", NICKMAX},
 169                         {"Maximum ident lengths differ or remote ident length not specified", "IDENTMAX", IDENTMAX},
 170                         {"Maximum channel lengths differ or remote channel length not specified", "CHANMAX", CHANMAX},
 171                         {"Maximum modes per line differ or remote modes per line not specified", "MAXMODES", MAXMODES},
 172                         {"Maximum quit lengths differ or remote quit length not specified", "MAXQUIT", MAXQUIT},
 173                         {"Maximum topic lengths differ or remote topic length not specified", "MAXTOPIC", MAXTOPIC},
 174                         {"Maximum kick lengths differ or remote kick length not specified", "MAXKICK", MAXKICK},
 175                         {"Maximum GECOS (fullname) lengths differ or remote GECOS length not specified", "MAXGECOS", MAXGECOS},
 176                         {"Maximum awaymessage lengths differ or remote awaymessage length not specified", "MAXAWAY", MAXAWAY},
 177                         {"", "", 0}
 178                 };
 179
 180                 if (((this->CapKeys.find("IP6SUPPORT") == this->CapKeys.end()) && (ip6support)) || ((this->CapKeys.find("IP6SUPPORT") != this->CapKeys.end()) && (this->CapKeys.find("IP6SUPPORT")->second != ConvToStr(ip6support))))
 181                         reason = "We don't both support linking to IPV6 servers";
 182                 if (((this->CapKeys.find("IP6NATIVE") != this->CapKeys.end()) && (this->CapKeys.find("IP6NATIVE")->second == "1")) && (!ip6support))
 183                         reason = "The remote server is IPV6 native, and we don't support linking to IPV6 servers";
 184                 if (((this->CapKeys.find("PROTOCOL") == this->CapKeys.end()) || ((this->CapKeys.find("PROTOCOL") != this->CapKeys.end()) && (this->CapKeys.find("PROTOCOL")->second != ConvToStr(ProtocolVersion)))))
 185                 {
 186                         if (this->CapKeys.find("PROTOCOL") != this->CapKeys.end())
 187                                 reason = "Mismatched protocol versions "+this->CapKeys.find("PROTOCOL")->second+" and "+ConvToStr(ProtocolVersion);
 188                         else
 189                                 reason = "Protocol version not specified";
 190                 }
 191
 192                 if(this->CapKeys.find("PREFIX") != this->CapKeys.end() && this->CapKeys.find("PREFIX")->second != this->Instance->Modes->BuildPrefixes())
 193                         reason = "One or more of the prefixes on the remote server are invalid on this server.";
 194
 195                 if (((this->CapKeys.find("HALFOP") == this->CapKeys.end()) && (Instance->Config->AllowHalfop)) || ((this->CapKeys.find("HALFOP") != this->CapKeys.end()) && (this->CapKeys.find("HALFOP")->second != ConvToStr(Instance->Config->AllowHalfop))))
 196                         reason = "We don't both have halfop support enabled/disabled identically";
 197
 198                 for (int x = 0; valid_capab[x].size; ++x)
 199                 {
 200                         if (((this->CapKeys.find(valid_capab[x].key) == this->CapKeys.end()) || ((this->CapKeys.find(valid_capab[x].key) != this->CapKeys.end()) &&
 201                                                  (this->CapKeys.find(valid_capab[x].key)->second != ConvToStr(valid_capab[x].size)))))
 202                                 reason = valid_capab[x].reason;
 203                 }
 204
 205                 /* Challenge response, store their challenge for our password */
 206                 std::map<std::string,std::string>::iterator n = this->CapKeys.find("CHALLENGE");
 207                 if (Utils->ChallengeResponse && (n != this->CapKeys.end()) && (Instance->Modules->Find("m_sha256.so")))
 208                 {
 209                         /* Challenge-response is on now */
 210                         this->SetTheirChallenge(n->second);
 211                         if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
 212                         {
 213                                 this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(OutboundPass, this->GetTheirChallenge())+" 0 "+
 214                                                 Instance->Config->GetSID()+" :"+this->Instance->Config->ServerDesc);
 215                         }
 216                 }
 217                 else
 218                 {
 219                         /* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
 220                         if (this->LinkState == CONNECTING)
 221                                 this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+OutboundPass+" 0 "+Instance->Config->GetSID()+" :"+this->Instance->Config->ServerDesc);
 222                 }
 223
 224                 if (reason.length())
 225                 {
 226                         this->SendError("CAPAB negotiation failed: "+reason);
 227                         return false;
 228                 }
 229         }
 230         else if ((params[0] == "MODULES") && (params.size() == 2))
 231         {
 232                 if (!this->ModuleList.length())
 233                 {
 234                         this->ModuleList.append(params[1]);
 235                 }
 236                 else
 237                 {
 238                         this->ModuleList.append(",");
 239                         this->ModuleList.append(params[1]);
 240                 }
 241         }
 242
 243         else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
 244         {
 245                 irc::tokenstream capabs(params[1]);
 246                 std::string item;
 247                 bool more = true;
 248                 while ((more = capabs.GetToken(item)))
 249                 {
 250                         /* Process each key/value pair */
 251                         std::string::size_type equals = item.rfind('=');
 252                         if (equals != std::string::npos)
 253                         {
 254                                 std::string var = item.substr(0, equals);
 255                                 std::string value = item.substr(equals+1, item.length());
 256                                 CapKeys[var] = value;
 257                         }
 258                 }
 259         }
 260         return true;
 261 }
 262