X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fdns.cpp;h=a6599bf0ab9e9b1613411bb96453e5cc182c306b;hb=e078fae142238765f279b50c309f22a5a0761ce4;hp=c91e45e9c929f207385cc75e22791750812fba68;hpb=5adcfa35c2c6df8c356841c11835f25e3422364c;p=user%2Fhenk%2Fcode%2Finspircd.git diff --git a/src/dns.cpp b/src/dns.cpp index c91e45e9c..a6599bf0a 100644 --- a/src/dns.cpp +++ b/src/dns.cpp @@ -2,7 +2,7 @@ * | Inspire Internet Relay Chat Daemon | * +------------------------------------+ * - * InspIRCd: (C) 2002-2007 InspIRCd Development Team + * InspIRCd: (C) 2002-2008 InspIRCd Development Team * See: http://www.inspircd.org/wiki/index.php/Credits * * This program is free but copyrighted software; see @@ -11,6 +11,8 @@ * --------------------------------------------------- */ +/* $Core: libIRCDasyncdns */ + /* dns.cpp - Nonblocking DNS functions. Very very loosely based on the firedns library, @@ -100,39 +102,40 @@ class DNSRequest DNS* dnsobj; /* DNS caller (where we get our FD from) */ unsigned long ttl; /* Time to live */ std::string orig; /* Original requested name/ip */ + InspIRCd* ServerInstance; DNSRequest(InspIRCd* Instance, DNS* dns, int id, const std::string &original); ~DNSRequest(); - DNSInfo ResultIsReady(DNSHeader &h, int length); + DNSInfo ResultIsReady(DNSHeader &h, int length, int result_we_want); int SendRequests(const DNSHeader *header, const int length, QueryType qt); }; -class CacheTimer : public InspTimer +class CacheTimer : public Timer { private: InspIRCd* ServerInstance; DNS* dns; public: CacheTimer(InspIRCd* Instance, DNS* thisdns) - : InspTimer(3600, Instance->Time(), true), ServerInstance(Instance), dns(thisdns) { } + : Timer(3600, Instance->Time(), true), ServerInstance(Instance), dns(thisdns) { } - virtual void Tick(time_t TIME) + virtual void Tick(time_t) { dns->PruneCache(); } }; -class RequestTimeout : public InspTimer +class RequestTimeout : public Timer { InspIRCd* ServerInstance; DNSRequest* watch; int watchid; public: - RequestTimeout(unsigned long n, InspIRCd* SI, DNSRequest* watching, int id) : InspTimer(n, time(NULL)), ServerInstance(SI), watch(watching), watchid(id) + RequestTimeout(unsigned long n, InspIRCd* SI, DNSRequest* watching, int id) : Timer(n, time(NULL)), ServerInstance(SI), watch(watching), watchid(id) { } - void Tick(time_t TIME) + void Tick(time_t) { if (ServerInstance->Res->requests[watchid] == watch) { @@ -144,19 +147,19 @@ class RequestTimeout : public InspTimer ServerInstance->Res->Classes[watchid] = NULL; } ServerInstance->Res->requests[watchid] = NULL; - DELETE(watch); + delete watch; return; } } }; /* Allocate the processing buffer */ -DNSRequest::DNSRequest(InspIRCd* Instance, DNS* dns, int id, const std::string &original) : dnsobj(dns) +DNSRequest::DNSRequest(InspIRCd* Instance, DNS* dns, int rid, const std::string &original) : dnsobj(dns), ServerInstance(Instance) { res = new unsigned char[512]; *res = 0; orig = original; - RequestTimeout* RT = new RequestTimeout(Instance->Config->dns_timeout ? Instance->Config->dns_timeout : 5, Instance, this, id); + RequestTimeout* RT = new RequestTimeout(Instance->Config->dns_timeout ? Instance->Config->dns_timeout : 5, Instance, this, rid); Instance->Timers->AddTimer(RT); /* The timer manager frees this */ } @@ -210,6 +213,8 @@ inline void DNS::EmptyHeader(unsigned char *output, const DNSHeader *header, con /** Send requests we have previously built down the UDP socket */ int DNSRequest::SendRequests(const DNSHeader *header, const int length, QueryType qt) { + ServerInstance->Logs->Log("RESOLVER", DEBUG,"DNSRequest::SendRequests"); + unsigned char payload[sizeof(DNSHeader)]; this->rr_class = 1; @@ -225,29 +230,22 @@ int DNSRequest::SendRequests(const DNSHeader *header, const int length, QueryTyp memcpy(&addr.sin6_addr,&dnsobj->myserver6,sizeof(addr.sin6_addr)); addr.sin6_family = AF_INET6; addr.sin6_port = htons(DNS::QUERY_PORT); - if (sendto(dnsobj->GetFd(), payload, length + 12, 0, (sockaddr *) &addr, sizeof(addr)) != length+12) + if (ServerInstance->SE->SendTo(dnsobj, payload, length + 12, 0, (sockaddr *) &addr, sizeof(addr)) != length+12) return -1; } else +#endif { sockaddr_in addr; memset(&addr,0,sizeof(addr)); memcpy(&addr.sin_addr.s_addr,&dnsobj->myserver4,sizeof(addr.sin_addr)); addr.sin_family = AF_INET; addr.sin_port = htons(DNS::QUERY_PORT); - if (sendto(dnsobj->GetFd(), payload, length + 12, 0, (sockaddr *) &addr, sizeof(addr)) != length+12) + if (ServerInstance->SE->SendTo(dnsobj, (const char*)payload, length + 12, 0, (sockaddr *) &addr, sizeof(addr)) != length+12) return -1; } -#else - sockaddr_in addr; - memset(&addr,0,sizeof(addr)); - memcpy(&addr.sin_addr.s_addr, &dnsobj->myserver4, sizeof(addr.sin_addr)); - addr.sin_family = AF_INET; - addr.sin_port = htons(DNS::QUERY_PORT); - if (sendto(dnsobj->GetFd(), (const char*)payload, length + 12, 0, (sockaddr *) &addr, sizeof(addr)) != length+12) - return -1; -#endif + ServerInstance->Logs->Log("RESOLVER",DEBUG,"Sent OK"); return 0; } @@ -319,8 +317,8 @@ void DNS::Rehash() { if (ServerInstance && ServerInstance->SE) ServerInstance->SE->DelFd(this); - shutdown(this->GetFd(), 2); - close(this->GetFd()); + ServerInstance->SE->Shutdown(this, 2); + ServerInstance->SE->Close(this); this->SetFd(-1); /* Rehash the cache */ @@ -334,9 +332,9 @@ void DNS::Rehash() if ((strstr(ServerInstance->Config->DNSServer,"::ffff:") == (char*)&ServerInstance->Config->DNSServer) || (strstr(ServerInstance->Config->DNSServer,"::FFFF:") == (char*)&ServerInstance->Config->DNSServer)) { - ServerInstance->Log(DEFAULT,"WARNING: Using IPv4 addresses over IPv6 forces some DNS checks to be disabled."); - ServerInstance->Log(DEFAULT," This should not cause a problem, however it is recommended you migrate"); - ServerInstance->Log(DEFAULT," to a true IPv6 environment."); + ServerInstance->Logs->Log("RESOLVER",DEFAULT,"WARNING: Using IPv4 addresses over IPv6 forces some DNS checks to be disabled."); + ServerInstance->Logs->Log("RESOLVER",DEFAULT," This should not cause a problem, however it is recommended you migrate"); + ServerInstance->Logs->Log("RESOLVER",DEFAULT," to a true IPv6 environment."); this->ip6munge = true; } @@ -359,6 +357,7 @@ void DNS::Rehash() /* Initialize mastersocket */ int s = OpenTCPSocket(ServerInstance->Config->DNSServer, SOCK_DGRAM); this->SetFd(s); + ServerInstance->SE->NonBlocking(this->GetFd()); /* Have we got a socket and is it nonblocking? */ if (this->GetFd() != -1) @@ -367,8 +366,9 @@ void DNS::Rehash() if (!ServerInstance->BindSocket(this->GetFd(), portpass, "", false)) { /* Failed to bind */ - shutdown(this->GetFd(),2); - close(this->GetFd()); + ServerInstance->Logs->Log("RESOLVER",DEBUG,"Error binding dns socket"); + ServerInstance->SE->Shutdown(this, 2); + ServerInstance->SE->Close(this); this->SetFd(-1); } @@ -379,19 +379,24 @@ void DNS::Rehash() { if (!ServerInstance->SE->AddFd(this)) { - ServerInstance->Log(DEFAULT,"Internal error starting DNS - hostnames will NOT resolve."); - shutdown(this->GetFd(),2); - close(this->GetFd()); + ServerInstance->Logs->Log("RESOLVER",DEFAULT,"Internal error starting DNS - hostnames will NOT resolve."); + ServerInstance->SE->Shutdown(this, 2); + ServerInstance->SE->Close(this); this->SetFd(-1); } } } } + else + { + ServerInstance->Logs->Log("RESOLVER",DEBUG,"Error creating dns socket"); + } } /** Initialise the DNS UDP socket so that we can send requests */ DNS::DNS(InspIRCd* Instance) : ServerInstance(Instance) { + ServerInstance->Logs->Log("RESOLVER",DEBUG,"DNS::DNS"); /* Clear the Resolver class table */ memset(Classes,0,sizeof(Classes)); @@ -610,7 +615,7 @@ void DNS::MakeIP6Int(char* query, const in6_addr *ip) } /** Return the next id which is ready, and the result attached to it */ -DNSResult DNS::GetResult() +DNSResult DNS::GetResult(int resultnum) { /* Fetch dns query response and decide where it belongs */ DNSHeader header; @@ -625,10 +630,7 @@ DNSResult DNS::GetResult() const char* ipaddr_from; unsigned short int port_from = 0; - void* m_readEvent = NULL; - GetExt("windows_readevent", m_readEvent); - - int length = _recvfrom(this->GetFd(),(char*)buffer,sizeof(DNSHeader),0,from,&x); + int length = ServerInstance->SE->RecvFrom(this, (char*)buffer, sizeof(DNSHeader), 0, from, &x); /* Did we get the whole header? */ if (length < 12) @@ -700,7 +702,7 @@ DNSResult DNS::GetResult() * When its finished it will return a DNSInfo which is a pair of * unsigned char* resource record data, and an error message. */ - DNSInfo data = req->ResultIsReady(header, length); + DNSInfo data = req->ResultIsReady(header, length, resultnum); std::string resultstr; /* Check if we got a result, if we didnt, its an error */ @@ -731,15 +733,7 @@ DNSResult DNS::GetResult() case DNS_QUERY_AAAA: { - snprintf(formatted,40,"%x:%x:%x:%x:%x:%x:%x:%x", - (ntohs(data.first[0]) + ntohs(data.first[1] << 8)), - (ntohs(data.first[2]) + ntohs(data.first[3] << 8)), - (ntohs(data.first[4]) + ntohs(data.first[5] << 8)), - (ntohs(data.first[6]) + ntohs(data.first[7] << 8)), - (ntohs(data.first[8]) + ntohs(data.first[9] << 8)), - (ntohs(data.first[10]) + ntohs(data.first[11] << 8)), - (ntohs(data.first[12]) + ntohs(data.first[13] << 8)), - (ntohs(data.first[14]) + ntohs(data.first[15] << 8))); + inet_ntop(AF_INET6, data.first, formatted, sizeof(formatted)); char* c = strstr(formatted,":0:"); if (c != NULL) { @@ -785,7 +779,7 @@ DNSResult DNS::GetResult() } /** A result is ready, process it */ -DNSInfo DNSRequest::ResultIsReady(DNSHeader &header, int length) +DNSInfo DNSRequest::ResultIsReady(DNSHeader &header, int length, int result_we_want) { int i = 0; int q = 0; @@ -797,6 +791,7 @@ DNSInfo DNSRequest::ResultIsReady(DNSHeader &header, int length) rr.type = DNS_QUERY_NONE; rr.rdlength = 0; rr.ttl = 1; /* GCC is a whiney bastard -- see the XXX below. */ + rr.rr_class = 0; /* Same for VC++ */ if (!(header.flags1 & FLAGS_MASK_QR)) return std::make_pair((unsigned char*)NULL,"Not a query result"); @@ -855,7 +850,9 @@ DNSInfo DNSRequest::ResultIsReady(DNSHeader &header, int length) return std::make_pair((unsigned char*)NULL,"Incorrectly sized DNS reply"); /* XXX: We actually initialise 'rr' here including its ttl field */ - DNS::FillResourceRecord(&rr,&header.payload[i]); + if (curanswer == result_we_want) + DNS::FillResourceRecord(&rr,&header.payload[i]); + i += 10; if (rr.type != this->type) { @@ -872,7 +869,7 @@ DNSInfo DNSRequest::ResultIsReady(DNSHeader &header, int length) break; } if ((unsigned int)curanswer == header.ancount) - return std::make_pair((unsigned char*)NULL,"No valid answers"); + return std::make_pair((unsigned char*)NULL,"No more answers (" + ConvToStr(header.ancount) + " answers, wanted #" + ConvToStr(result_we_want) + ")"); if (i + rr.rdlength > (unsigned int)length) return std::make_pair((unsigned char*)NULL,"Resource record larger than stated"); @@ -928,16 +925,15 @@ DNSInfo DNSRequest::ResultIsReady(DNSHeader &header, int length) res[rr.rdlength] = 0; break; } - return std::make_pair(res,"No error");; + return std::make_pair(res,"No error"); } /** Close the master socket */ DNS::~DNS() { - shutdown(this->GetFd(), 2); - close(this->GetFd()); + ServerInstance->SE->Shutdown(this, 2); + ServerInstance->SE->Close(this); ServerInstance->Timers->DelTimer(this->PruneTimer); - delete this->PruneTimer; } CachedQuery* DNS::GetCache(const std::string &source) @@ -957,12 +953,13 @@ void DNS::DelCache(const std::string &source) void Resolver::TriggerCachedResult() { if (CQ) - OnLookupComplete(CQ->data, time_left, true); + OnLookupComplete(CQ->data, time_left, true, 0); } /** High level abstraction of dns used by application at large */ Resolver::Resolver(InspIRCd* Instance, const std::string &source, QueryType qt, bool &cached, Module* creator) : ServerInstance(Instance), Creator(creator), input(source), querytype(qt) { + ServerInstance->Logs->Log("RESOLVER",DEBUG,"Resolver::Resolver"); cached = false; CQ = ServerInstance->Res->GetCache(source); @@ -1031,10 +1028,14 @@ Resolver::Resolver(InspIRCd* Instance, const std::string &source, QueryType qt, /* We shouldnt get here really */ return; } + else + { + ServerInstance->Logs->Log("RESOLVER",DEBUG,"DNS request id %d", this->myid); + } } /** Called when an error occurs */ -void Resolver::OnError(ResolverError e, const std::string &errormessage) +void Resolver::OnError(ResolverError, const std::string&) { /* Nothing in here */ } @@ -1057,10 +1058,18 @@ Module* Resolver::GetCreator() } /** Process a socket read event */ -void DNS::HandleEvent(EventType et, int errornum) +void DNS::HandleEvent(EventType, int) { /* Fetch the id and result of the next available packet */ - DNSResult res = this->GetResult(); + int resultnum = 0; + DNSResult res(0,"",0,""); + res.id = 0; + ServerInstance->Logs->Log("RESOLVER",DEBUG,"Handle DNS event"); + + res = this->GetResult(resultnum); + + ServerInstance->Logs->Log("RESOLVER",DEBUG,"Result %d id %d", resultnum, res.id); + /* Is there a usable request id? */ if (res.id != -1) { @@ -1078,6 +1087,7 @@ void DNS::HandleEvent(EventType et, int errornum) delete Classes[res.id]; Classes[res.id] = NULL; } + return; } else { @@ -1086,24 +1096,27 @@ void DNS::HandleEvent(EventType et, int errornum) { if (ServerInstance && ServerInstance->stats) ServerInstance->stats->statsDnsGood++; - + if (!this->GetCache(res.original.c_str())) this->cache->insert(std::make_pair(res.original.c_str(), CachedQuery(res.result, res.ttl))); - Classes[res.id]->OnLookupComplete(res.result, res.ttl, false); + Classes[res.id]->OnLookupComplete(res.result, res.ttl, false, resultnum); delete Classes[res.id]; Classes[res.id] = NULL; } } - + if (ServerInstance && ServerInstance->stats) ServerInstance->stats->statsDns++; } -} + resultnum++; +} + /** Add a derived Resolver to the working set */ bool DNS::AddResolverClass(Resolver* r) { + ServerInstance->Logs->Log("RESOLVER",DEBUG,"AddResolverClass 0x%08lx", (unsigned long)r); /* Check the pointers validity and the id's validity */ if ((r) && (r->GetId() > -1)) { @@ -1152,22 +1165,14 @@ void DNS::CleanResolvers(Module* module) /** Generate pseudo-random number */ unsigned long DNS::PRNG() { -#ifndef WIN32 unsigned long val = 0; timeval n; serverstats* s = ServerInstance->stats; gettimeofday(&n,NULL); - val = (n.tv_usec ^ getpid() ^ geteuid() ^ (this->currid++)) ^ s->statsAccept + n.tv_sec; - val = val + s->statsCollisions ^ s->statsDnsGood - s->statsDnsBad; + val = (n.tv_usec ^ (getpid() ^ geteuid()) ^ ((this->currid++)) ^ s->statsAccept) + n.tv_sec; + val = val + (s->statsCollisions ^ s->statsDnsGood) - s->statsDnsBad; val += (s->statsConnects ^ (unsigned long)s->statsSent ^ (unsigned long)s->statsRecv) - ServerInstance->Config->ports.size(); return val; -#else - unsigned long val = 0; - serverstats* s = ServerInstance->stats; - val = (time(NULL) ^ GetCurrentProcessId() ^ GetCurrentThreadId() ^ (this->currid++)) ^ s->statsAccept + time(NULL); - val = val + s->statsCollisions ^ s->statsDnsGood - s->statsDnsBad; - val += (s->statsConnects ^ (unsigned long)s->statsSent ^ (unsigned long)s->statsRecv); - return val; -#endif } +