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 " /* Preprocessor does this one. */
  84                         ":NICKMAX="+ConvToStr(NICKMAX)+
  85                         " HALFOP="+ConvToStr(this->Instance->Config->AllowHalfop)+
  86                         " CHANMAX="+ConvToStr(CHANMAX)+
  87                         " MAXMODES="+ConvToStr(MAXMODES)+
  88                         " IDENTMAX="+ConvToStr(IDENTMAX)+
  89                         " MAXQUIT="+ConvToStr(MAXQUIT)+
  90                         " MAXTOPIC="+ConvToStr(MAXTOPIC)+
  91                         " MAXKICK="+ConvToStr(MAXKICK)+
  92                         " MAXGECOS="+ConvToStr(MAXGECOS)+
  93                         " MAXAWAY="+ConvToStr(MAXAWAY)+
  94                         " IP6NATIVE="+ConvToStr(ip6)+
  95                         " IP6SUPPORT="+ConvToStr(ip6support)+
  96                         " PROTOCOL="+ConvToStr(ProtocolVersion)+extra+
  97                         " PREFIX="+Instance->Modes->BuildPrefixes()+
  98                         " CHANMODES="+Instance->Modes->ChanModes()+
  99                         " SVSPART=1");
 100
 101         this->WriteLine("CAPAB END");
 102 }
 103
 104 /* Check a comma seperated list for an item */
 105 bool TreeSocket::HasItem(const std::string &list, const std::string &item)
 106 {
 107         irc::commasepstream seplist(list);
 108         std::string item2;
 109
 110         while (seplist.GetToken(item2))
 111         {
 112                 if (item2 == item)
 113                         return true;
 114         }
 115         return false;
 116 }
 117
 118 /* Isolate and return the elements that are different between two comma seperated lists */
 119 std::string TreeSocket::ListDifference(const std::string &one, const std::string &two)
 120 {
 121         irc::commasepstream list_one(one);
 122         std::string item;
 123         std::string result;
 124         while (list_one.GetToken(item))
 125         {
 126                 if (!HasItem(two, item))
 127                 {
 128                         result.append(" ");
 129                         result.append(item);
 130                 }
 131         }
 132         return result;
 133 }
 134
 135 bool TreeSocket::Capab(const std::deque<std::string> &params)
 136 {
 137         if (params.size() < 1)
 138         {
 139                 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
 140                 return false;
 141         }
 142         if (params[0] == "START")
 143         {
 144                 this->ModuleList.clear();
 145                 this->CapKeys.clear();
 146         }
 147         else if (params[0] == "END")
 148         {
 149                 std::string reason;
 150                 int ip6support = 0;
 151 #ifdef SUPPORT_IP6LINKS
 152                 ip6support = 1;
 153 #endif
 154                 /* Compare ModuleList and check CapKeys...
 155                  * Maybe this could be tidier? -- Brain
 156                  */
 157                 if ((this->ModuleList != this->MyCapabilities()) && (this->ModuleList.length()))
 158                 {
 159                         std::string diff = ListDifference(this->ModuleList, this->MyCapabilities());
 160                         if (!diff.length())
 161                         {
 162                                 diff = "your server:" + ListDifference(this->MyCapabilities(), this->ModuleList);
 163                         }
 164                         else
 165                         {
 166                                 diff = "this server:" + diff;
 167                         }
 168                         if (diff.length() == 12)
 169                                 reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
 170                         else
 171                                 reason = "Modules loaded on these servers are not correctly matched, these modules are not loaded on " + diff;
 172                 }
 173
 174                 cap_validation valid_capab[] = {
 175                         {"Maximum nickname lengths differ or remote nickname length not specified", "NICKMAX", NICKMAX},
 176                         {"Maximum ident lengths differ or remote ident length not specified", "IDENTMAX", IDENTMAX},
 177                         {"Maximum channel lengths differ or remote channel length not specified", "CHANMAX", CHANMAX},
 178                         {"Maximum modes per line differ or remote modes per line not specified", "MAXMODES", MAXMODES},
 179                         {"Maximum quit lengths differ or remote quit length not specified", "MAXQUIT", MAXQUIT},
 180                         {"Maximum topic lengths differ or remote topic length not specified", "MAXTOPIC", MAXTOPIC},
 181                         {"Maximum kick lengths differ or remote kick length not specified", "MAXKICK", MAXKICK},
 182                         {"Maximum GECOS (fullname) lengths differ or remote GECOS length not specified", "MAXGECOS", MAXGECOS},
 183                         {"Maximum awaymessage lengths differ or remote awaymessage length not specified", "MAXAWAY", MAXAWAY},
 184                         {"", "", 0}
 185                 };
 186
 187                 if (((this->CapKeys.find("IP6SUPPORT") == this->CapKeys.end()) && (ip6support)) || ((this->CapKeys.find("IP6SUPPORT") != this->CapKeys.end()) && (this->CapKeys.find("IP6SUPPORT")->second != ConvToStr(ip6support))))
 188                         reason = "We don't both support linking to IPV6 servers";
 189                 if (((this->CapKeys.find("IP6NATIVE") != this->CapKeys.end()) && (this->CapKeys.find("IP6NATIVE")->second == "1")) && (!ip6support))
 190                         reason = "The remote server is IPV6 native, and we don't support linking to IPV6 servers";
 191                 if (((this->CapKeys.find("PROTOCOL") == this->CapKeys.end()) || ((this->CapKeys.find("PROTOCOL") != this->CapKeys.end()) && (this->CapKeys.find("PROTOCOL")->second != ConvToStr(ProtocolVersion)))))
 192                 {
 193                         if (this->CapKeys.find("PROTOCOL") != this->CapKeys.end())
 194                                 reason = "Mismatched protocol versions "+this->CapKeys.find("PROTOCOL")->second+" and "+ConvToStr(ProtocolVersion);
 195                         else
 196                                 reason = "Protocol version not specified";
 197                 }
 198
 199                 if(this->CapKeys.find("PREFIX") != this->CapKeys.end() && this->CapKeys.find("PREFIX")->second != this->Instance->Modes->BuildPrefixes())
 200                         reason = "One or more of the prefixes on the remote server are invalid on this server.";
 201
 202                 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))))
 203                         reason = "We don't both have halfop support enabled/disabled identically";
 204
 205                 for (int x = 0; valid_capab[x].size; ++x)
 206                 {
 207                         if (((this->CapKeys.find(valid_capab[x].key) == this->CapKeys.end()) || ((this->CapKeys.find(valid_capab[x].key) != this->CapKeys.end()) &&
 208                                                  (this->CapKeys.find(valid_capab[x].key)->second != ConvToStr(valid_capab[x].size)))))
 209                                 reason = valid_capab[x].reason;
 210                 }
 211
 212                 /* Challenge response, store their challenge for our password */
 213                 std::map<std::string,std::string>::iterator n = this->CapKeys.find("CHALLENGE");
 214                 if (Utils->ChallengeResponse && (n != this->CapKeys.end()) && (Instance->Modules->Find("m_sha256.so")))
 215                 {
 216                         /* Challenge-response is on now */
 217                         this->SetTheirChallenge(n->second);
 218                         if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
 219                         {
 220                                 this->SendCapabilities();
 221                                 this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(OutboundPass, this->GetTheirChallenge())+" 0 "+
 222                                                 Instance->Config->GetSID()+" :"+this->Instance->Config->ServerDesc);
 223                         }
 224                 }
 225                 else
 226                 {
 227                         /* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
 228                         if (this->LinkState == CONNECTING)
 229                         {
 230                                 this->SendCapabilities();
 231                                 this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+OutboundPass+" 0 "+Instance->Config->GetSID()+" :"+this->Instance->Config->ServerDesc);
 232                         }
 233                 }
 234
 235                 if (reason.length())
 236                 {
 237                         this->SendError("CAPAB negotiation failed: "+reason);
 238                         return false;
 239                 }
 240         }
 241         else if ((params[0] == "MODULES") && (params.size() == 2))
 242         {
 243                 if (!this->ModuleList.length())
 244                 {
 245                         this->ModuleList.append(params[1]);
 246                 }
 247                 else
 248                 {
 249                         this->ModuleList.append(",");
 250                         this->ModuleList.append(params[1]);
 251                 }
 252         }
 253
 254         else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
 255         {
 256                 irc::tokenstream capabs(params[1]);
 257                 std::string item;
 258                 bool more = true;
 259                 while ((more = capabs.GetToken(item)))
 260                 {
 261                         /* Process each key/value pair */
 262                         std::string::size_type equals = item.rfind('=');
 263                         if (equals != std::string::npos)
 264                         {
 265                                 std::string var = item.substr(0, equals);
 266                                 std::string value = item.substr(equals+1, item.length());
 267                                 CapKeys[var] = value;
 268                         }
 269                 }
 270         }
 271         return true;
 272 }
 273