1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2007 InspIRCd Development Team
6 * See: http://www.inspircd.org/wiki/index.php/Credits
8 * This program is free but copyrighted software; see
9 * the file COPYING for details.
11 * ---------------------------------------------------
14 #include <sys/types.h>
15 #include <sys/socket.h>
16 #include <netinet/in.h>
17 #include <arpa/inet.h>
25 /* $ModDesc: Provides handling of DNS blacklists */
27 /* Class holding data for a single entry */
31 enum EnumBanaction { I_UNKNOWN, I_KILL, I_ZLINE, I_KLINE, I_GLINE };
32 std::string name, domain, reason;
33 EnumBanaction banaction;
36 DNSBLConfEntry(): duration(86400),bitmask(0) {}
40 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
42 class DNSBLResolver : public Resolver
46 DNSBLConfEntry *ConfEntry;
49 DNSBLResolver(Module *me, InspIRCd *ServerInstance, const std::string &hostname, userrec* u, int userfd, DNSBLConfEntry *conf)
50 : Resolver(ServerInstance, hostname, DNS_QUERY_A, me)
57 virtual void OnLookupComplete(const std::string &result)
59 /* Check the user still exists */
60 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
62 ServerInstance->Log(DEBUG, "m_dnsbl: %s got a result from dnsbl %s", them->nick, ConfEntry->name.c_str());
64 // Now we calculate the bitmask: 256*(256*(256*a+b)+c)+d
67 unsigned int bitmask=0;
68 unsigned int octetpos=0;
69 std::string tmp = result;
74 /* Fix by brain, npos is -1, so unsigned int will never match */
75 std::string::size_type lastdot = tmp.rfind(".");
77 if (lastdot == std::string::npos)
84 octet=tmp.substr(lastdot+1,tmp.length()-lastdot+1);
88 bitmask += (256 ^ octetpos) * atoi(octet.c_str());
92 bitmask &= ConfEntry->bitmask;
96 std::string reason = ConfEntry->reason;
98 std::string::size_type pos;
99 while ((pos = reason.find("%ip%")) != std::string::npos)
101 reason.replace(pos, 4, them->GetIPString());
104 ServerInstance->WriteOpers("*** Connecting user %s detected as being on a DNS blacklist (%s) with result %d", them->GetFullRealHost(), ConfEntry->name.c_str(), bitmask);
106 switch (ConfEntry->banaction)
108 case DNSBLConfEntry::I_KILL:
110 userrec::QuitUser(ServerInstance, them, std::string("Killed (") + reason + ")");
113 case DNSBLConfEntry::I_KLINE:
115 ServerInstance->AddKLine(ConfEntry->duration, ServerInstance->Config->ServerName, reason, std::string("*@") + them->GetIPString());
118 case DNSBLConfEntry::I_GLINE:
120 ServerInstance->AddGLine(ConfEntry->duration, ServerInstance->Config->ServerName, reason, std::string("*@") + them->GetIPString());
123 case DNSBLConfEntry::I_ZLINE:
125 ServerInstance->AddZLine(ConfEntry->duration, ServerInstance->Config->ServerName, reason, them->GetIPString());
128 case DNSBLConfEntry::I_UNKNOWN:
139 virtual void OnError(ResolverError e, const std::string &errormessage)
142 this just means they don't appear in the respective dnsbl
143 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
147 /* Check the user still exists */
148 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
150 ServerInstance->Log(DEBUG, "m_dnsbl: %s got an error while resolving for dnsbl %s", them->nick, ConfEntry->name.c_str());
154 virtual ~DNSBLResolver()
159 class ModuleDNSBL : public Module
162 std::vector<DNSBLConfEntry *> DNSBLConfEntries;
165 * Convert a string to EnumBanaction
167 DNSBLConfEntry::EnumBanaction str2banaction(const std::string &action)
169 if(action.compare("KILL")==0)
170 return DNSBLConfEntry::I_KILL;
171 if(action.compare("KLINE")==0)
172 return DNSBLConfEntry::I_KLINE;
173 if(action.compare("ZLINE")==0)
174 return DNSBLConfEntry::I_ZLINE;
175 if(action.compare("GLINE")==0)
176 return DNSBLConfEntry::I_GLINE;
178 return DNSBLConfEntry::I_UNKNOWN;
181 ModuleDNSBL(InspIRCd *Me) : Module::Module(Me)
186 virtual ~ModuleDNSBL()
191 virtual Version GetVersion()
193 return Version(2, 0, 0, 1, VF_VENDOR, API_VERSION);
196 void Implements(char* List)
198 List[I_OnRehash] = List[I_OnUserRegister] = 1;
201 /** Clear entries and free the mem it was using
205 std::vector<DNSBLConfEntry *>::iterator i;
206 while ((i = DNSBLConfEntries.begin()) != DNSBLConfEntries.end())
208 DNSBLConfEntries.erase(i);
213 /** Fill our conf vector with data
215 virtual void ReadConf()
217 ConfigReader *MyConf = new ConfigReader(ServerInstance);
220 for (int i=0; i< MyConf->Enumerate("dnsbl"); i++)
222 DNSBLConfEntry *e = new DNSBLConfEntry();
224 e->name = MyConf->ReadValue("dnsbl", "name", i);
225 e->reason = MyConf->ReadValue("dnsbl", "reason", i);
226 e->domain = MyConf->ReadValue("dnsbl", "domain", i);
227 e->banaction = str2banaction(MyConf->ReadValue("dnsbl", "action", i));
228 e->duration = ServerInstance->Duration(MyConf->ReadValue("dnsbl", "duration", i).c_str());
229 e->bitmask = MyConf->ReadInteger("dnsbl", "bitmask", i, false);
231 /* yeah, logic here is a little messy */
234 ServerInstance->WriteOpers("*** DNSBL(#%d): invalid bitmask",i);
236 else if (e->name == "")
238 ServerInstance->WriteOpers("*** DNSBL(#%d): Invalid name",i);
240 else if (e->domain == "")
242 ServerInstance->WriteOpers("*** DNSBL(#%d): Invalid domain",i);
244 else if (e->banaction == DNSBLConfEntry::I_UNKNOWN)
246 ServerInstance->WriteOpers("*** DNSBL(#%d): Invalid banaction", i);
252 ServerInstance->WriteOpers("*** DNSBL(#%d): empty reason, using defaults",i);
253 e->reason = "Your IP has been blacklisted.";
256 /* add it, all is ok */
257 DNSBLConfEntries.push_back(e);
261 /* delete and drop it, error somewhere */
268 virtual void OnRehash(const std::string ¶meter)
274 * We will check each user that connects *locally* (userrec::fd>0)
276 virtual int OnUserRegister(userrec* user)
280 /* following code taken from bopm, reverses an IP address. */
282 unsigned char a, b, c, d;
283 char reversedipbuf[128];
284 std::string reversedip;
286 if (!inet_aton(user->GetIPString(), &in))
288 ServerInstance->WriteOpers("Invalid IP address in m_dnsbl! Bailing check");
292 d = (unsigned char) (in.s_addr >> 24) & 0xFF;
293 c = (unsigned char) (in.s_addr >> 16) & 0xFF;
294 b = (unsigned char) (in.s_addr >> 8) & 0xFF;
295 a = (unsigned char) in.s_addr & 0xFF;
297 snprintf(reversedipbuf, 128, "%d.%d.%d.%d", d, c, b, a);
298 reversedip = std::string(reversedipbuf);
300 // For each DNSBL, we will run through this lookup
301 for (std::vector<DNSBLConfEntry *>::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++)
303 // Fill hostname with a dnsbl style host (d.c.b.a.domain.tld)
304 std::string hostname=reversedip+"."+ (*i)->domain;
306 ServerInstance->Log(DEBUG, "m_dnsbl: sending %s for resolution", hostname.c_str());
308 /* now we'd need to fire off lookups for `hostname'. */
309 DNSBLResolver *r = new DNSBLResolver(this, ServerInstance, hostname, user, user->GetFd(), *i);
310 ServerInstance->AddResolver(r);
314 /* don't do anything with this hot potato */
319 // stuff down here is the module-factory stuff.
321 class ModuleDNSBLFactory : public ModuleFactory
328 ~ModuleDNSBLFactory()
332 virtual Module *CreateModule(InspIRCd *Me)
334 return new ModuleDNSBL(Me);
340 extern "C" void * init_module( void )
342 return new ModuleDNSBLFactory;