1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2009 InspIRCd Development Team
6 * See: http://wiki.inspircd.org/Credits
8 * This program is free but copyrighted software; see
9 * the file COPYING for details.
11 * ---------------------------------------------------
18 #include <sys/types.h>
19 #include <sys/socket.h>
20 #include <netinet/in.h>
21 #include <arpa/inet.h>
24 /* $ModDesc: Provides handling of DNS blacklists */
26 /* Class holding data for a single entry */
27 class DNSBLConfEntry : public classbase
30 enum EnumBanaction { I_UNKNOWN, I_KILL, I_ZLINE, I_KLINE, I_GLINE };
31 enum EnumType { A_RECORD, A_BITMASK };
32 std::string name, domain, reason;
33 EnumBanaction banaction;
37 unsigned char records[256];
38 unsigned long stats_hits, stats_misses;
39 DNSBLConfEntry(): type(A_BITMASK),duration(86400),bitmask(0),stats_hits(0), stats_misses(0) {}
44 /** Resolver for CGI:IRC hostnames encoded in ident/GECOS
46 class DNSBLResolver : public Resolver
50 DNSBLConfEntry *ConfEntry;
54 DNSBLResolver(Module *me, InspIRCd *Instance, const std::string &hostname, User* u, int userfd, DNSBLConfEntry *conf, bool &cached)
55 : Resolver(Instance, hostname, DNS_QUERY_A, cached, me)
62 /* Note: This may be called multiple times for multiple A record results */
63 virtual void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached, int resultnum = 0)
65 /* for bitmask reply types, we arent interested in any but the first result (number 0) */
66 if ((ConfEntry->type == DNSBLConfEntry::A_BITMASK) && (resultnum))
69 /* Check the user still exists */
70 if ((them) && (them == ServerInstance->SE->GetRef(theirfd)))
72 // Now we calculate the bitmask: 256*(256*(256*a+b)+c)+d
75 unsigned int bitmask = 0, record = 0;
79 inet_aton(result.c_str(), &resultip);
81 switch (ConfEntry->type)
83 case DNSBLConfEntry::A_BITMASK:
84 bitmask = resultip.s_addr >> 24; /* Last octet (network byte order) */
85 bitmask &= ConfEntry->bitmask;
86 match = (bitmask != 0);
88 case DNSBLConfEntry::A_RECORD:
89 record = resultip.s_addr >> 24; /* Last octet */
90 match = (ConfEntry->records[record] == 1);
96 std::string reason = ConfEntry->reason;
97 std::string::size_type x = reason.find("%ip%");
98 while (x != std::string::npos)
101 reason.insert(x, them->GetIPString());
102 x = reason.find("%ip%");
105 ConfEntry->stats_hits++;
107 switch (ConfEntry->banaction)
109 case DNSBLConfEntry::I_KILL:
111 ServerInstance->Users->QuitUser(them, std::string("Killed (") + reason + ")");
114 case DNSBLConfEntry::I_KLINE:
116 KLine* kl = new KLine(ServerInstance, ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName, reason.c_str(),
117 "*", them->GetIPString());
118 if (ServerInstance->XLines->AddLine(kl,NULL))
120 ServerInstance->SNO->WriteToSnoMask('x',"m_dnsbl added K:line on *@%s to expire on %s (%s).",
121 them->GetIPString(), ServerInstance->TimeString(kl->expiry).c_str(), reason.c_str());
122 ServerInstance->XLines->ApplyLines();
128 case DNSBLConfEntry::I_GLINE:
130 GLine* gl = new GLine(ServerInstance, ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName, reason.c_str(),
131 "*", them->GetIPString());
132 if (ServerInstance->XLines->AddLine(gl,NULL))
134 ServerInstance->SNO->WriteToSnoMask('x',"m_dnsbl added G:line on *@%s to expire on %s (%s).",
135 them->GetIPString(), ServerInstance->TimeString(gl->expiry).c_str(), reason.c_str());
136 ServerInstance->XLines->ApplyLines();
142 case DNSBLConfEntry::I_ZLINE:
144 ZLine* zl = new ZLine(ServerInstance, ServerInstance->Time(), ConfEntry->duration, ServerInstance->Config->ServerName, reason.c_str(),
145 them->GetIPString());
146 if (ServerInstance->XLines->AddLine(zl,NULL))
148 ServerInstance->SNO->WriteToSnoMask('x',"m_dnsbl added Z:line on *@%s to expire on %s (%s).",
149 them->GetIPString(), ServerInstance->TimeString(zl->expiry).c_str(), reason.c_str());
150 ServerInstance->XLines->ApplyLines();
156 case DNSBLConfEntry::I_UNKNOWN:
163 ServerInstance->SNO->WriteGlobalSno('a', "Connecting user %s detected as being on a DNS blacklist (%s) with result %d", them->GetFullRealHost().c_str(), ConfEntry->name.c_str(), (ConfEntry->type==DNSBLConfEntry::A_BITMASK) ? bitmask : record);
166 ConfEntry->stats_misses++;
169 ConfEntry->stats_misses++;
173 virtual void OnError(ResolverError e, const std::string &errormessage)
177 virtual ~DNSBLResolver()
182 class ModuleDNSBL : public Module
185 std::vector<DNSBLConfEntry *> DNSBLConfEntries;
188 * Convert a string to EnumBanaction
190 DNSBLConfEntry::EnumBanaction str2banaction(const std::string &action)
192 if(action.compare("KILL")==0)
193 return DNSBLConfEntry::I_KILL;
194 if(action.compare("KLINE")==0)
195 return DNSBLConfEntry::I_KLINE;
196 if(action.compare("ZLINE")==0)
197 return DNSBLConfEntry::I_ZLINE;
198 if(action.compare("GLINE")==0)
199 return DNSBLConfEntry::I_GLINE;
201 return DNSBLConfEntry::I_UNKNOWN;
204 ModuleDNSBL(InspIRCd *Me) : Module(Me)
207 Implementation eventlist[] = { I_OnRehash, I_OnUserRegister, I_OnStats };
208 ServerInstance->Modules->Attach(eventlist, this, 3);
211 virtual ~ModuleDNSBL()
216 virtual Version GetVersion()
218 return Version("$Id$", VF_VENDOR, API_VERSION);
222 /** Clear entries and free the mem it was using
226 for (std::vector<DNSBLConfEntry *>::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++)
228 DNSBLConfEntries.clear();
231 /** Fill our conf vector with data
233 virtual void ReadConf()
235 ConfigReader *MyConf = new ConfigReader(ServerInstance);
238 for (int i=0; i< MyConf->Enumerate("dnsbl"); i++)
240 DNSBLConfEntry *e = new DNSBLConfEntry();
242 e->name = MyConf->ReadValue("dnsbl", "name", i);
243 e->reason = MyConf->ReadValue("dnsbl", "reason", i);
244 e->domain = MyConf->ReadValue("dnsbl", "domain", i);
246 if (MyConf->ReadValue("dnsbl", "type", i) == "bitmask")
248 e->type = DNSBLConfEntry::A_BITMASK;
249 e->bitmask = MyConf->ReadInteger("dnsbl", "bitmask", i, false);
253 memset(e->records, 0, sizeof(e->records));
254 e->type = DNSBLConfEntry::A_RECORD;
255 irc::portparser portrange(MyConf->ReadValue("dnsbl", "records", i), false);
257 while ((item = portrange.GetToken()))
258 e->records[item] = 1;
261 e->banaction = str2banaction(MyConf->ReadValue("dnsbl", "action", i));
262 e->duration = ServerInstance->Duration(MyConf->ReadValue("dnsbl", "duration", "60", i));
264 /* Use portparser for record replies */
266 /* yeah, logic here is a little messy */
267 if ((e->bitmask <= 0) && (DNSBLConfEntry::A_BITMASK == e->type))
269 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): invalid bitmask",i);
271 else if (e->name.empty())
273 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): Invalid name",i);
275 else if (e->domain.empty())
277 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): Invalid domain",i);
279 else if (e->banaction == DNSBLConfEntry::I_UNKNOWN)
281 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): Invalid banaction", i);
283 else if (e->duration <= 0)
285 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): Invalid duration", i);
289 if (e->reason.empty())
291 ServerInstance->SNO->WriteGlobalSno('a', "DNSBL(#%d): empty reason, using defaults",i);
292 e->reason = "Your IP has been blacklisted.";
295 /* add it, all is ok */
296 DNSBLConfEntries.push_back(e);
300 /* delete and drop it, error somewhere */
307 virtual void OnRehash(User* user)
312 virtual int OnUserRegister(User* user)
314 /* only do lookups on local users */
317 /* following code taken from bopm, reverses an IP address. */
319 unsigned char a, b, c, d;
320 char reversedipbuf[128];
321 std::string reversedip;
324 success = inet_aton(user->GetIPString(), &in);
329 d = (unsigned char) (in.s_addr >> 24) & 0xFF;
330 c = (unsigned char) (in.s_addr >> 16) & 0xFF;
331 b = (unsigned char) (in.s_addr >> 8) & 0xFF;
332 a = (unsigned char) in.s_addr & 0xFF;
334 snprintf(reversedipbuf, 128, "%d.%d.%d.%d", d, c, b, a);
335 reversedip = std::string(reversedipbuf);
337 // For each DNSBL, we will run through this lookup
338 for (std::vector<DNSBLConfEntry *>::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++)
340 // Fill hostname with a dnsbl style host (d.c.b.a.domain.tld)
341 std::string hostname = reversedip + "." + (*i)->domain;
343 /* now we'd need to fire off lookups for `hostname'. */
345 DNSBLResolver *r = new DNSBLResolver(this, ServerInstance, hostname, user, user->GetFd(), *i, cached);
346 ServerInstance->AddResolver(r, cached);
350 /* don't do anything with this hot potato */
354 virtual int OnStats(char symbol, User* user, string_list &results)
359 unsigned long total_hits = 0, total_misses = 0;
361 for (std::vector<DNSBLConfEntry*>::iterator i = DNSBLConfEntries.begin(); i != DNSBLConfEntries.end(); i++)
363 total_hits += (*i)->stats_hits;
364 total_misses += (*i)->stats_misses;
366 results.push_back(std::string(ServerInstance->Config->ServerName) + " 304 " + user->nick + " :DNSBLSTATS DNSbl \"" + (*i)->name + "\" had " +
367 ConvToStr((*i)->stats_hits) + " hits and " + ConvToStr((*i)->stats_misses) + " misses");
370 results.push_back(std::string(ServerInstance->Config->ServerName) + " 304 " + user->nick + " :DNSBLSTATS Total hits: " + ConvToStr(total_hits));
371 results.push_back(std::string(ServerInstance->Config->ServerName) + " 304 " + user->nick + " :DNSBLSTATS Total misses: " + ConvToStr(total_misses));
377 MODULE_INIT(ModuleDNSBL)