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