1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
7 * <brain@chatspike.net>
8 * <Craig@chatspike.net>
10 * Written by Craig Edwards, Craig McLure, and others.
11 * This program is free but copyrighted software; see
12 * the file COPYING for details.
14 * ---------------------------------------------------
17 #include "inspircd_config.h"
19 #include "configreader.h"
21 #include <sys/errno.h>
22 #include <sys/ioctl.h>
23 #include <sys/utsname.h>
27 #include "inspstring.h"
30 #include "helperfuncs.h"
32 #include "socketengine.h"
35 extern ServerConfig* Config;
36 extern InspIRCd* ServerInstance;
40 Lookup* dnslist[MAX_DESCRIPTORS];
41 Lookup* user_fd_to_dns[MAX_DESCRIPTORS];
43 //enum LookupState { reverse, forward };
69 bool DoLookup(std::string nick)
72 userrec* usr = Find(nick);
75 resolver1.SetNS(std::string(Config->DNSServer));
76 if (!resolver1.ReverseLookup(std::string(usr->host), true))
80 strlcpy(u,nick.c_str(),NICKMAX-1);
82 /* ASSOCIATE WITH DNS LOOKUP LIST */
83 if (resolver1.GetFD() != -1)
85 dnslist[resolver1.GetFD()] = this;
86 user_fd_to_dns[usr->fd] = this;
93 bool Done(int fdcheck)
97 // doing forward lookup
99 if (resolver2.HasResult(fdcheck))
101 if (resolver2.GetFD() != -1)
103 dnslist[resolver2.GetFD()] = NULL;
104 std::string ip = resolver2.GetResultIP();
108 if (usr->registered > 3)
110 usr->dns_done = true;
113 if ((hostname != "") && (usr->registered != 7))
115 if ((std::string(inet_ntoa(usr->ip4)) == ip) && (hostname.length() < 65))
117 if ((hostname.find_last_of(".in-addr.arpa") == hostname.length() - 1) && (hostname.find_last_of(".in-addr.arpa") != std::string::npos))
119 WriteServ(usr->fd,"NOTICE Auth :*** Your ISP are muppets -- reverse resolution resolves back to same reverse .arpa domain (!)");
123 strlcpy(usr->host,hostname.c_str(),64);
124 strlcpy(usr->dhost,hostname.c_str(),64);
125 WriteServ(usr->fd,"NOTICE Auth :*** Found your hostname");
128 usr->dns_done = true;
138 usr->dns_done = true;
147 // doing reverse lookup
149 if (resolver1.HasResult(fdcheck))
152 if ((usr) && (usr->dns_done))
154 if (resolver1.GetFD() != -1)
156 dnslist[resolver1.GetFD()] = NULL;
157 user_fd_to_dns[usr->fd] = NULL;
161 if (resolver1.GetFD() != -1)
163 dnslist[resolver1.GetFD()] = NULL;
164 hostname = resolver1.GetResult();
167 user_fd_to_dns[usr->fd] = NULL;
168 if ((usr->registered > 3) || (hostname == ""))
170 WriteServ(usr->fd,"NOTICE Auth :*** Could not resolve your hostname -- Using your IP address instead");
171 usr->dns_done = true;
176 resolver2.ForwardLookup(hostname, true);
177 if (resolver2.GetFD() != -1)
179 dnslist[resolver2.GetFD()] = this;
181 user_fd_to_dns[usr->fd] = this;
193 userrec* usr = Find(u);
202 bool lookup_dns(const std::string &nick)
204 /* First attempt to find the nickname */
205 userrec* u = Find(nick);
208 /* Check the cache */
209 /*address_cache::iterator address = addrcache.find(u->ip4);
210 if (address != addrcache.end())
212 WriteServ(u->fd,"NOTICE Auth :*** Found your hostname (cached)");
213 log(DEBUG,"Found cached host");
214 strlcpy(u->host,address->second->c_str(),MAXBUF);
215 strlcpy(u->dhost,address->second->c_str(),MAXBUF);
219 /* If the user exists, create a new
220 * lookup object, and associate it
221 * with the user. The lookup object
222 * will maintain the reference table
223 * which we use for quickly finding
224 * dns results. Please note that we
225 * do not associate a lookup with a
226 * userrec* pointer and we use the
227 * nickname instead because, by the
228 * time the DNS lookup has completed,
229 * the nickname could have quit and
230 * if we then try and access the
231 * pointer we get a nice segfault.
233 Lookup* L = new Lookup();
240 void ZapThisDns(int fd)
242 if ((fd < 0) || (fd > MAX_DESCRIPTORS))
245 Lookup *x = user_fd_to_dns[fd];
249 if (x->resolver1.GetFD() > 0)
251 log(DEBUG,"Whacked resolver1");
252 dns_close(x->resolver1.GetFD());
255 if (x->resolver2.GetFD() > 0)
257 log(DEBUG,"Whacked resolver2");
258 dns_close(x->resolver2.GetFD());
263 void dns_poll(int fdcheck)
265 /* Check the given file descriptor is in valid range */
266 if ((fdcheck < 0) || (fdcheck > MAX_DESCRIPTORS))
269 /* Try and find the file descriptor in our list of
272 Lookup *x = dnslist[fdcheck];
275 /* If it exists check if its a valid fd still */
276 if (x->GetFD() != -1)
278 /* Check if its done, if it is delete it */
279 if (x->Done(fdcheck))
281 /* We don't need to delete the file descriptor
282 * from the socket engine, as dns.cpp tracks it
283 * for us if we are in single-threaded country.
290 /* its fd is dodgy, the dns code probably
291 * bashed it due to error. Free the class.
295 /* If we got down here, the dns lookup was valid, BUT,
296 * its still in progress. Be patient, and wait for
297 * more socketengine events to complete the lookups.
301 /* This FD doesnt belong here, lets be rid of it,
302 * just to be safe so we dont get any more events
305 if (ServerInstance && ServerInstance->SE)
306 ServerInstance->SE->DelFd(fdcheck);