pike.git/lib/modules/Protocols.pmod/DNS.pmod:f93b6fe3c8660468dfc028b873ada16716c24e99

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Support for the Domain Name System protocol. //! //! RFC 1034, RFC 1035 and RFC 2308 protected void send_reply(mapping r, mapping q, mapping m, Stdio.UDP udp); #pike __REAL_VERSION__ final constant NOERROR=0; final constant FORMERR=1; final constant SERVFAIL=2; final constant NXDOMAIN=3; final constant NOTIMPL=4; final constant REFUSED=5; final constant NXRRSET=8; final constant QUERY=0; //! Resource classes enum ResourceClass { //! Class Internet C_IN=1, //! Class CSNET (Obsolete) C_CS=2, //! Class CHAOS C_CH=3, //! Class Hesiod C_HS=4, //! Class ANY C_ANY=255, }; //! Entry types enum EntryType { //! Type - host address T_A=1, //! Type - authoritative name server T_NS=2, //! Type - mail destination (Obsolete - use MX) T_MD=3, //! Type - mail forwarder (Obsolete - use MX) T_MF=4, //! Type - canonical name for an alias T_CNAME=5, //! Type - start of a zone of authority T_SOA=6, //! Type - mailbox domain name (EXPERIMENTAL) T_MB=7, //! Type - mail group member (EXPERIMENTAL) T_MG=8, //! Type - mail rename domain name (EXPERIMENTAL) T_MR=9, //! Type - null RR (EXPERIMENTAL) T_NULL=10, //! Type - well known service description T_WKS=11, //! Type - domain name pointer T_PTR=12, //! Type - host information T_HINFO=13, //! Type - mailbox or mail list information T_MINFO=14, //! Type - mail exchange T_MX=15, //! Type - text strings T_TXT=16, //! Type - IPv6 address record (RFC 1886, deprecated) T_AAAA=28, //! Type - Location Record (RFC 1876) T_LOC=29, //! Type - Service location record (RFC 2782) T_SRV=33, //! Type - NAPTR (RFC 3403) T_NAPTR=35, //! Type - IPv6 address record (RFC 2874, incomplete support) T_A6=38, //! Type - SPF - Sender Policy Framework (RFC 4408) T_SPF=99, }; int safe_bind(Stdio.UDP udp, mixed ... args) { mixed err = catch { udp->bind(@args); return 1; }; #if constant(System.EADDRINUSE) if (errno() == System.EADDRINUSE) return 0; #endif #if constant(System.WSAEACCES) if (errno() == System.WSAEACCES) return 0; #endif werror("Protocols.DNS: Binding of UDP port failed with errno %d: %s\n", errno(), strerror(errno())); master()->handle_error(err); return 0; } //! Low level DNS protocol class protocol { string mklabel(string s) { if(sizeof(s)>63) error("Too long component in domain name.\n"); return sprintf("%c%s",sizeof(s),s); } protected private string mkname(string|array(string) labels, int pos, mapping(string:int) comp) { if(stringp(labels)) labels = labels/"."-({""}); if(!labels || !sizeof(labels)) return "\0"; string n = labels*"."; if(comp[n]) return sprintf("%2c", comp[n]|0xc000); else { if(pos<0x4000) comp[n]=pos; string l = mklabel(labels[0]); return l + mkname(labels[1..], pos+sizeof(l), comp); } } protected string make_raw_addr6(string addr6) { if(!addr6) return "\0"*16; if(has_value(addr6, "::")) { int parts = sizeof((addr6/":")-({""})); if(has_value(addr6, ".")) parts++; addr6 = replace(addr6, "::", ":"+"0:"*(8-parts)); sscanf(addr6, ":%s", addr6); } if(has_value(addr6, ".")) return sprintf("%2c%2c%2c%2c%2c%2c%1c%1c%1c%1c", @array_sscanf(addr6, "%x:%x:%x:%x:%x:%x:%x.%x.%x.%x")); else return sprintf("%@2c", array_sscanf(addr6, "%x:%x:%x:%x:%x:%x:%x:%x")); } protected private string mkrdata(mapping entry, int pos, mapping(string:int) c) { switch(entry->type) { case T_CNAME: return mkname(entry->cname, pos, c); case T_PTR: return mkname(entry->ptr, pos, c); case T_NS: return mkname(entry->ns, pos, c); case T_MD: return mkname(entry->md, pos, c); case T_MF: return mkname(entry->mf, pos, c); case T_MB: return mkname(entry->mb, pos, c); case T_MG: return mkname(entry->mg, pos, c); case T_MR: return mkname(entry->mr, pos, c); case T_MX: return sprintf("%2c", entry->preference)+mkname(entry->mx, pos+2, c); case T_HINFO: return sprintf("%1c%s%1c%s", sizeof(entry->cpu||""), entry->cpu||"", sizeof(entry->os||""), entry->os||""); case T_MINFO: string rmailbx = mkname(entry->rmailbx, pos, c); return rmailbx + mkname(entry->emailbx, pos+sizeof(rmailbx), c); case T_SRV: return sprintf("%2c%2c%2c", entry->priority, entry->weight, entry->port) + mkname(entry->target||"", pos+6, c); case T_A: return sprintf("%@1c", (array(int))((entry->a||"0.0.0.0")/".")[0..3]); case T_AAAA: return make_raw_addr6(entry->aaaa); case T_A6: if( stringp( entry->a6 ) || !entry->a6 ) return "\0"+make_raw_addr6(entry->a6); return sprintf( "%c%s%s", entry->a6->prefixlen, make_raw_addr6(entry->a6->address)[entry->a6->prefixlen/8..], entry->a6->prefixname||""); case T_SOA: string mname = mkname(entry->mname, pos, c); return mname + mkname(entry->rname, pos+sizeof(mname), c) + sprintf("%4c%4c%4c%4c%4c", entry->serial, entry->refresh, entry->retry, entry->expire, entry->minimum); case T_NAPTR: string rnaptr = sprintf("%2c%2c", entry->order, entry->preference); rnaptr += sprintf("%1c%s%1c%s%1c%s%s", sizeof(entry->flags || ""), entry->flags || "", sizeof(entry->service || ""), entry->service || "", sizeof(entry->regexp || ""), entry->regexp || "", mkname(entry->replacement, pos, c)); return rnaptr; case T_TXT: return Array.map(stringp(entry->txt)? ({entry->txt}):(entry->txt||({})), lambda(string t) { return sprintf("%1c%s", sizeof(t), t); })*""; case T_SPF: return Array.map(stringp(entry->spf)? ({entry->spf}):(entry->spf||({})), lambda(string t) { return sprintf("%1c%s", sizeof(t), t); })*""; case T_LOC: // FIXME: Not implemented yet. default: return ""; } } protected private string encode_entries(array(mapping) entries, int pos, mapping(string:int) comp) { string res=""; foreach(entries, mapping entry) { string e = mkname(entry->name, pos, comp)+ sprintf("%2c%2c%4c", entry->type, entry->cl, entry->ttl); pos += sizeof(e)+2; string rd = entry->rdata || mkrdata(entry, pos, comp); res += e + sprintf("%2c", sizeof(rd)) + rd; pos += sizeof(rd); } return res; } string low_low_mkquery(mapping q) { array qd = q->qd && (arrayp(q->qd)? q->qd : ({q->qd})); array an = q->an && (arrayp(q->an)? q->an : ({q->an})); array ns = q->ns && (arrayp(q->ns)? q->ns : ({q->ns})); array ar = q->ar && (arrayp(q->ar)? q->ar : ({q->ar})); string r = sprintf("%2c%c%c%2c%2c%2c%2c", q->id, ((q->rd)&1)|(((q->tc)&1)<<1)|(((q->aa)&1)<<2)| (((q->opcode)&15)<<3)|(((q->qr)&1)<<7), ((q->rcode)&15)|(((q->cd)&1)<<4)|(((q->ad)&1)<<5)| (((q->ra)&1)<<7), qd && sizeof(qd), an && sizeof(an), ns && sizeof(ns), ar && sizeof(ar)); mapping(string:int) c = ([]); if(qd) foreach(qd, mapping _qd) r += mkname(_qd->name, sizeof(r), c) + sprintf("%2c%2c", _qd->type, _qd->cl); if(an) r+=encode_entries(an, sizeof(r), c); if(ns) r+=encode_entries(ns, sizeof(r), c); if(ar) r+=encode_entries(ar, sizeof(r), c); return r; } string low_mkquery(int id, string dname, int cl, int type) { return low_low_mkquery((["id":id, "rd":1, "qd":(["name":dname, "cl":cl, "type":type])])); } //! create a DNS query PDU //! //! @param dnameorquery //! @param cl //! record class such as Protocols.DNS.C_IN //! @param type //! query type such Protocols.DNS.T_A //! //! @returns //! data suitable for use with //! @[Protocols.DNS.client.do_sync_query] //! //! @example //! // generate a query PDU for a address lookup on the hostname pike.ida.liu.se //! string q=Protocols.DNS.protocol()->mkquery("pike.ida.liu.se", Protocols.DNS.C_IN, Protocols.DNS.T_A); string mkquery(string|mapping dnameorquery, int|void cl, int|void type) { if(mappingp(dnameorquery)) return low_low_mkquery(dnameorquery); else return low_mkquery(random(65536),dnameorquery,cl,type); } string decode_domain(string msg, array(int) n) { array(string) domains=({}); int pos=n[0]; int next=-1; array(string) ret=({}); while(pos < sizeof(msg)) { switch(int len=msg[pos]) { case 0: if(next==-1) next=pos+1; n[0]=next; return ret*"."; case 1..63: pos+=len+1; ret+=({msg[pos-len..pos-1]}); continue; default: if((~len)&0xc0) error("Invalid message compression mode.\n"); if(next==-1) next=pos+2; pos=((len&63)<<8) + msg[pos+1]; continue; } break; } } string decode_string(string s, array(int) next) { int len=s[next[0]]; next[0]+=len+1; return s[next[0]-len..next[0]-1]; } int decode_byte(string s, array(int) next) { return s[next[0]++]; } int decode_short(string s, array(int) next) { sscanf(s[next[0]..next[0]+1],"%2c",int ret); next[0]+=2; return ret; } int decode_int(string s, array(int) next) { sscanf(s[next[0]..next[0]+3],"%4c",int ret); next[0]+=4; return ret; } //! Decode a set of entries from an answer. //! //! @param s //! Encoded entries. //! //! @param num //! Number of entires in @[s]. //! //! @param next //! Array with a single element containing the start position in @[s] //! on entry and the continuation position on return. //! //! @returns //! Returns an array of mappings describing the decoded entires: //! @array //! @elem mapping 0.. //! Mapping describing a single entry: //! @mapping //! @member string "name" //! Name the entry concerns. //! @member EntryType "type" //! Type of entry. //! @member ResourceClass "cl" //! Resource class. Typically @[C_IN]. //! @member int "ttl" //! Time to live for the entry in seconds. //! @member int "len" //! Length in bytes of the encoded data section. //! @endmapping //! Depending on the type of entry the mapping may contain //! different additional fields: //! @int //! @value T_CNAME //! @mapping //! @member string "cname" //! @endmapping //! @value T_PTR //! @mapping //! @member string "ptr" //! @endmapping //! @value T_NS //! @mapping //! @member string "ns" //! @endmapping //! @value T_MX //! @mapping //! @member int "preference" //! @member string "mx" //! @endmapping //! @value T_HINFO //! @mapping //! @member string "cpu" //! @member string "os" //! @endmapping //! @value T_SRV //! RFC 2052 and RFC 2782. //! @mapping //! @member int "priority" //! @member int "weight" //! @member int "port" //! @member string "target" //! @member string "service" //! @member string "proto" //! @member string "name" //! @endmapping //! @value T_A //! @mapping //! @member string "a" //! IPv4-address in dotted-decimal format. //! @endmapping //! @value T_AAAA //! @mapping //! @member string "aaaa" //! IPv6-address in colon-separated hexadecimal format. //! @endmapping //! @value T_LOC //! @mapping //! @member int "version" //! Version, currently only version @expr{0@} (zero) is //! supported. //! @member int "size" //! @member int "h_perc" //! @member int "v_perc" //! @member int "lat" //! @member int "long" //! @member int "alt" //! @endmapping //! @value T_SOA //! @mapping //! @member string "mname" //! @member string "rname" //! @member int "serial" //! @member int "refresh" //! @member int "retry" //! @member int "expire" //! //! @member int "minimum" //! Note: For historical reasons this entry is named //! @expr{"minimum"@}, but it contains the TTL for //! negative answers (RFC 2308). //! @endmapping //! @value T_NAPTR //! @mapping //! @member int "order" //! @member int "preference" //! @member string "flags" //! @member string "service" //! @member string "regexp" //! @member string "replacement" //! @endmapping //! @value T_TXT //! @mapping //! @member string "txt" //! Note: For historical reasons, when receiving decoded //! DNS entries from a client, this will be the first string //! in the TXT record only. //! @member string "txta" //! When receiving decoded DNS data from a client, txta is //! the array of all strings in the record. When sending //! multiple strings in a TXT record in a server, please //! supply an array as "txt" containing the strings, txta //! will be ignored. //! @endmapping //! @value T_SPF //! @mapping //! @member string "spf" //! @endmapping //! @endint //! @endarray array decode_entries(string s,int num, array(int) next) { array(string) ret=({}); for(int e=0;e<num && next[0]<sizeof(s);e++) { mapping m=([]); m->name=decode_domain(s,next); sscanf(s[next[0]..next[0]+10], "%2c%2c%4c%2c", m->type,m->cl,m->ttl,m->len); next[0]+=10; int tmp=next[0]; switch(m->type) { case T_CNAME: m->cname=decode_domain(s,next); break; case T_PTR: m->ptr=decode_domain(s,next); break; case T_NS: m->ns=decode_domain(s,next); break; case T_MX: m->preference=decode_short(s,next); m->mx=decode_domain(s,next); break; case T_HINFO: m->cpu=decode_string(s,next); m->os=decode_string(s,next); break; case T_SRV: // RFC 2052 and RFC 2782. m->priority=decode_short(s,next); m->weight=decode_short(s,next); m->port=decode_short(s,next); m->target=decode_domain(s,next); array x=m->name/"."; if(x[0][0..0]=="_") m->service=x[0][1..]; else m->service=x[0]; if(sizeof(x) > 1) { if(x[1][0..0]=="_") m->proto=x[1][1..]; else m->proto=x[1]; } m->name=x[2..]*"."; break; case T_A: m->a=sprintf("%{.%d%}",values(s[next[0]..next[0]+m->len-1]))[1..]; break; case T_AAAA: m->aaaa=sprintf("%{:%02X%02X%}", values(s[next[0]..next[0]+m->len-1])/2)[1..]; break; case T_LOC: m->version = decode_byte(s,next); if (m->version == 0) { int aByte; aByte = decode_byte(s,next); m->size = pow((aByte>>4)&0xf , aByte&0xf)/100.0; aByte = decode_byte(s,next); m->h_perc = pow((aByte>>4)&0xf , aByte&0xf)/100.0; aByte = decode_byte(s,next); m->v_perc = pow((aByte>>4)&0xf , aByte&0xf)/100.0; m->lat = ((decode_int(s,next)-(2<<30))/3600000.0); m->long = ((decode_int(s,next)-(2<<30))/3600000.0); m->alt = ((decode_int(s,next)/100.0)-100000.0); } break; case T_SOA: m->mname=decode_domain(s,next); m->rname=decode_domain(s,next); m->serial=decode_int(s,next); m->refresh=decode_int(s,next); m->retry=decode_int(s,next); m->expire=decode_int(s,next); m->minimum=decode_int(s,next); break; case T_NAPTR: m->order = decode_short (s, next); m->preference = decode_short (s, next); m->flags = decode_string (s, next); m->service = decode_string (s, next); m->regexp = decode_string (s, next); m->replacement = decode_domain (s, next); break; case T_TXT: { int tlen; m->txta = ({ }); while (tlen < m->len) { m->txta += ({ decode_string(s, next) }); tlen += sizeof(m->txta[-1]) + 1; } m->txt = m->txta[0]; } break; case T_SPF: m->spf = decode_string(s, next); break; } next[0]=tmp+m->len; ret+=({m}); } return ret; } mapping decode_res(string s) { mapping m=([]); sscanf(s,"%2c%c%c%2c%2c%2c%2c", m->id, m->c1, m->c2, m->qdcount, m->ancount, m->nscount, m->arcount); m->rd=m->c1&1; m->tc=(m->c1>>1)&1; m->aa=(m->c1>>2)&1; m->opcode=(m->c1>>3)&15; m->qr=(m->c1>>7)&1; m->rcode=m->c2&15; m->cd=(m->c2>>4)&1; m->ad=(m->c2>>5)&1; m->ra=(m->c2>>7)&1; m->length=sizeof(s); array(string) tmp=({}); array(int) next=({12}); m->qd = allocate(m->qdcount); for(int i=0; i<m->qdcount; i++) { m->qd[i]=(["name":decode_domain(s,next)]); sscanf(s[next[0]..next[0]+3],"%2c%2c",m->qd[i]->type, m->qd[i]->cl); next[0]+=4; } m->an=decode_entries(s,m->ancount,next); m->ns=decode_entries(s,m->nscount,next); m->ar=decode_entries(s,m->arcount,next); return m; } }; protected string ANY; protected void create() { // Check if IPv6 support is available, and that mapped IPv4 is enabled. catch { // Note: Attempt to bind on the IPv6 loopback (::1) // rather than on IPv6 any (::), to make sure some // IPv6 support is actually configured. This is needed // since eg Solaris happily binds on :: even // if no IPv6 interfaces are configured. // Try IPv6 any (::) too for paranoia reasons. // For even more paranoia, try sending some data // from :: to the drain services on 127.0.0.1 and ::1. // // If the tests fail, we regard the IPv6 support as broken, // and use just IPv4. Stdio.UDP udp = Stdio.UDP(); if (udp->bind(0, "::1") && udp->bind(0, "::") && (udp->send("127.0.0.1", 9, "/dev/null") == 9) && (udp->send("::1", 9, "/dev/null") == 9)) { // Note: The above tests are apparently not sufficient, since // WIN32 happily pretends to send stuff to ::ffff:0:0/96... Stdio.UDP udp2 = Stdio.UDP(); if (udp2->bind(0, "127.0.0.1")) { // IPv4 is present. array(string) a = udp2->query_address()/" "; int port = (int)a[1]; string key = Crypto.Random.random_string(16); udp2->set_nonblocking(); // We shouldn't get any lost packets, since we're on the loop-back, // but for paranoia reasons we perform a couple of retries. retry: for (int i = 0; i < 16; i++) { if (!udp->send("127.0.0.1", port, key)) continue; // udp2->wait() throws errors on WIN32. catch(udp2->wait(1)); mapping res; while ((res = udp2->read())) { if (res->data == key) { // Mapped IPv4 seems to work. ANY = "::"; break retry; } } } destruct(udp2); } } destruct(udp); }; } //! Base class for implementing a Domain Name Service (DNS) server. //! //! This class is typically used by inheriting it, //! and overloading @[reply_query()] and @[handle_response()]. class server { //! inherit protocol; //inherit Stdio.UDP : udp; array(Stdio.UDP) ports = ({}); protected void send_reply(mapping r, mapping q, mapping m, Stdio.UDP udp) { // FIXME: Needs to handle truncation somehow. if(!r) r = (["rcode":4]); r->id = q->id; r->qr = 1; r->opcode = q->opcode; r->rd = q->rd; r->qd = r->qd || q->qd; string s = mkquery(r); udp->send(m->ip, m->port, s); } //! Reply to a query (stub). //! //! @param query //! Parsed query. //! //! @param udp_data //! Raw UDP data. //! //! @param cb //! Callback you can call with the result instead of returning it. //! In that case, return @expr{0@} (zero). //! //! //! Overload this function to implement the proper lookup. //! //! @returns //! Returns @expr{0@} (zero) on failure, or a result mapping on success: //! @mapping //! @member int "rcode" //! @member array(mapping(string:string|int))|void "an" //! @array //! @elem mapping(string:string|int) entry //! @mapping //! @member string|array(string) "name" //! @member int "type" //! @member int "cl" //! @endmapping //! @endarray //! @member array|void "qd" //! @member array|void "ns" //! @member array|void "ar" //! @endmapping protected mapping reply_query(mapping query, mapping udp_data, function(mapping:void) cb) { // Override this function. // // Return mapping may contain: // aa, ra, {ad, cd,} rcode, an, ns, ar return 0; } protected void handle_query(mapping q, mapping m, Stdio.UDP udp) { int(0..1) result_available = 0; void _cb(mapping r) { if(result_available) error("DNS: you can either use the callback OR return the reply, not both.\n"); result_available = 1; send_reply(r, q, m, udp); }; mapping r = reply_query(q, m, _cb); if(r && result_available) error("DNS: you can either use the callback OR return the reply, not both.\n"); if(r) { result_available = 1; send_reply(r, q, m, udp); } } protected void handle_response(mapping r, mapping m, Stdio.UDP udp) { // This is a stub intended to simplify servers which allow recursion } protected private void rec_data(mapping m, Stdio.UDP udp) { mixed err; mapping q; if (err = catch { q=decode_res(m->data); }) { werror("DNS: Failed to read UDP packet.\n%s\n", describe_backtrace(err)); if(m && m->data && sizeof(m->data)>=2) send_reply((["rcode":1]), mkmapping(({"id"}), array_sscanf(m->data, "%2c")), m, udp); } else if(q->qr) handle_response(q, m, udp); else handle_query(q, m, udp); } //! @decl void create() //! @decl void create(int port) //! @decl void create(string ip) //! @decl void create(string ip, int port) //! @decl void create(string ip, int port, string|int ... more) //! //! Open one or more new DNS server ports. //! //! @param ip //! The IP to bind to. Defaults to @expr{"::"@} or @expr{0@} (ie ANY) //! depending on whether IPv6 support is present or not. //! //! @param port //! The port number to bind to. Defaults to @expr{53@}. //! //! @param more //! Optional further DNS server ports to open. //! Must be a set of @[ip], @[port] argument pairs. void create(int|string|void arg1, string|int ... args) { if(!arg1 && !sizeof(args)) arg1 = 53; if(!sizeof(args)) { if(stringp(arg1)) args = ({ arg1, 53 }); else args = ({ ANY, arg1 }); } else args = ({ arg1 }) + args; if(sizeof(args)&1) error("DNS: if you specify more than one argument, the number of " "arguments needs to be even (server(ip1, port1, ip2, port2, " "...)).\n"); for(int i;i<sizeof(args);i+=2) { Stdio.UDP udp = Stdio.UDP(); if(args[i]) { if (!safe_bind(udp, args[i+1], args[i])) error("DNS: failed to bind host:port %s:%d.\n", args[i],args[i+1]); } else { if(!safe_bind(udp, args[i+1])) error("DNS: failed to bind port %d.\n", args[i+1]); } udp->set_read_callback(rec_data, udp); // port objects are stored for destruction when the server object is destroyed. ports += ({udp}); } } static void destroy() { if(sizeof(ports)) { foreach(ports;; Stdio.UDP port) destruct(port); } } } #define RETRIES 12 #define RETRY_DELAY 5 //! Synchronous DNS client. class client { inherit protocol; #ifdef __NT__ array(string) get_tcpip_param(string val, void|string fallbackvalue) { array(string) res = ({}); foreach(({ "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters", "SYSTEM\\CurrentControlSet\\Services\\Tcpip6\\Parameters", "SYSTEM\\CurrentControlSet\\Services\\VxD\\MSTCP" }),string key) { catch { res += ({ RegGetValue(HKEY_LOCAL_MACHINE, key, val) }); }; } #if constant(RegGetKeyNames) /* Catch if RegGetKeyNames() doesn't find the directory. */ catch { foreach(RegGetKeyNames(HKEY_LOCAL_MACHINE, "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\" "Parameters\\Interfaces"), string key) { catch { res += ({ RegGetValue(HKEY_LOCAL_MACHINE, "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\" "Parameters\\Interfaces\\" + key, val) }); }; } foreach(RegGetKeyNames(HKEY_LOCAL_MACHINE, "SYSTEM\\CurrentControlSet\\Services\\Tcpip6\\" "Parameters\\Interfaces"), string key) { catch { res += ({ RegGetValue(HKEY_LOCAL_MACHINE, "SYSTEM\\CurrentControlSet\\Services\\Tcpip6\\" "Parameters\\Interfaces\\" + key, val) }); }; } }; #endif res -= ({ UNDEFINED }); return sizeof(res) ? res : ({ fallbackvalue }); } #else /* !__NT__ */ protected private mapping(string:string) etc_hosts; protected private int is_ip(string ip) { if( has_value( ip, ":") ) return (replace(ip, "0123456789abcdefABCDEF:"/1, allocate(23,"")) == ""); return (replace(ip, "0123456789."/1, allocate(11,"")) == ""); } protected private string read_etc_file(string fname) { array(string) paths; string res; #ifdef __NT__ paths = get_tcpip_param("DataBasePath"); #else paths = ({ "/etc", "/amitcp/db" }); #endif foreach(paths, string path) { string raw = Stdio.read_file(path + "/" + fname); if (raw && sizeof(raw = replace(raw, "\r", "\n"))) { if (res) { if (sizeof(res) && (res[-1] != '\n')) { // Avoid confusion... res += "\n"; } res += raw; } else { res = raw; } } } return res; } protected private string match_etc_hosts(string host) { if (!etc_hosts) { etc_hosts = ([ "localhost":"127.0.0.1" ]); string raw = read_etc_file("hosts"); if (raw && sizeof(raw)) { foreach(raw/"\n"-({""}), string line) { // Handle comments, and split the line on white-space line = lower_case(replace((line/"#")[0], "\t", " ")); array arr = (line/" ") - ({ "" }); if (sizeof(arr) > 1) { if (is_ip(arr[0])) { foreach(arr[1..], string name) { etc_hosts[name] = arr[0]; } } else { // Bad /etc/hosts entry ignored. } } } } else { // Couldn't read or no /etc/hosts. } } return etc_hosts[lower_case(host)]; } #endif /* !__NT__ */ // FIXME: Read hosts entry in /etc/nswitch.conf? //! @decl void create() //! @decl void create(void|string|array server, void|int|array domain) array(string) nameservers = ({}); array domains = ({}); void create(void|string|array(string) server, void|int|array(string) domain) { if(!server) { #if __NT__ domains = get_tcpip_param("Domain", "") + get_tcpip_param("DhcpDomain", "") + map(get_tcpip_param("SearchList", ""), lambda(string s) { return replace(s, " ", ",")/","; }) * ({}); nameservers = map(get_tcpip_param("NameServer", "") + get_tcpip_param("DhcpNameServer", ""), lambda(string s) { return replace(s, " ", ",")/","; }) * ({}); #else string domain; string resolv_conf; foreach(({"/etc/resolv.conf", "/amitcp/db/resolv.conf"}), string resolv_loc) if ((resolv_conf = Stdio.read_file(resolv_loc))) break; if (!resolv_conf) { if (System->get_netinfo_property) { // Mac OS X / Darwin (and possibly other systems) that use // NetInfo may have these values in the database. if (nameservers = System->get_netinfo_property(".", "/locations/resolver", "nameserver")) { nameservers = map(nameservers, `-, "\n"); } else { nameservers = ({}); } if (domains = System->get_netinfo_property(".", "/locations/resolver", "domain")) { domains = map(domains, `-, "\n"); } else { domains = ({}); } } else { /* FIXME: Is this a good idea? * Why not just try the fallback? * /grubba 1999-04-14 * * Now uses 127.0.0.1 as fallback. * /grubba 2000-10-17 */ resolv_conf = "nameserver 127.0.0.1"; } #if 0 error( "Protocols.DNS.client(): No /etc/resolv.conf!\n" ); #endif /* 0 */ } if (resolv_conf) foreach(resolv_conf/"\n", string line) { string rest; sscanf(line,"%s#",line); sscanf(line,"%*[\r \t]%s",line); line=reverse(line); sscanf(line,"%*[\r \t]%s",line); line=reverse(line); sscanf(line,"%s%*[ \t]%s",line,rest); switch(line) { case "domain": // Save domain for later. domain = sizeof(rest) && rest; break; case "search": rest = replace(rest, "\t", " "); domains += ((rest/" ") - ({""})); break; case "nameserver": if (!is_ip(rest)) { // Not an IP-number! string host = rest; if (!(rest = match_etc_hosts(host))) { werror("Protocols.DNS.client(): " "Can't resolv nameserver \"%s\"\n", host); break; } } if (sizeof(rest)) { nameservers += ({ rest }); } break; } } if(domain) domains = ({ domain }) + domains; #endif nameservers -= ({ "" }); if (!sizeof(nameservers)) { /* Try localhost... */ nameservers = ({ "127.0.0.1" }); } domains -= ({ "" }); domains = Array.map(domains, lambda(string d) { if (d[-1] == '.') { return d[..<1]; } return d; }); } else { if(arrayp(server)) nameservers = server; else nameservers = ({ server }); if(arrayp(domain)) domains = domain; else if(stringp(domain)) domains = ({ domain }); } } //! Perform a synchronous DNS query. //! //! @param s //! result of @[Protocols.DNS.protocol.mkquery] //! @returns //! mapping containing query result or 0 on failure/timeout //! //! @example //! // perform a hostname lookup, results stored in r->an //! object d=Protocols.DNS.client(); //! mapping r=d->do_sync_query(d->mkquery("pike.ida.liu.se", C_IN, T_A)); mapping do_sync_query(string s) { int i; object udp = Stdio.UDP(); // Attempt to randomize the source port. for (i = 0; i < RETRIES; i++) { if (!safe_bind(udp, 1024 + random(65536-1024), ANY)) continue; } if (i >= RETRIES) safe_bind(udp, 0, ANY) || udp->bind(0); #if 0 werror("Protocols.DNS.client()->do_sync_query(%O)\n" "UDP Address: %s\n" "%s\n", s, udp->query_address(), describe_backtrace(backtrace())); #endif /* 0 */ mapping m; for (i=0; i < RETRIES; i++) { udp->send(nameservers[i % sizeof(nameservers)], 53, s); // upd->wait() can throw an error sometimes. // // One common case is on WIN32 where select complains // about it not being a socket. catch { udp->wait(RETRY_DELAY); }; // Make sure that udp->read() doesn't block. udp->set_nonblocking(); // udp->read() can throw an error on connection refused. catch { m = udp->read(); if (m && (m->port == 53) && (m->data[0..1] == s[0..1]) && has_value(nameservers, m->ip)) { // Success. return decode_res(m->data); } }; // Restore blocking state for udp->send() on retry. udp->set_blocking(); } // Failure. return 0; } protected mapping low_gethostbyname(string s, int type) { mapping m; if(sizeof(domains) && s[-1] != '.' && sizeof(s/".") < 3) { mapping m = do_sync_query(mkquery(s, C_IN, type)); if(!m || !m->an || !sizeof(m->an)) foreach(domains, string domain) { m = do_sync_query(mkquery(s+"."+domain, C_IN, type)); if(m && m->an && sizeof(m->an)) break; } return m; } else { return do_sync_query(mkquery(s, C_IN, type)); } } //! @decl array gethostbyname(string hostname) //! Queries the host name from the default or given //! DNS server. The result is an array with three elements, //! //! @returns //! An array with the requested information about the specified //! host. //! //! @array //! @elem string hostname //! Hostname. //! @elem array(string) ip //! IP number(s). //! @elem array(string) aliases //! DNS name(s). //! @endarray //! //! @note //! Prior to Pike 7.7 this function only returned IPv4 addresses. //! array gethostbyname(string s) { mapping a_records = low_gethostbyname(s, T_A); mapping a6_records = low_gethostbyname(s, T_A6); mapping aaaa_records = low_gethostbyname(s, T_AAAA); #if 0 werror("a_records: %O\n" "a6_records: %O\n" "aaaa_records: %O\n", a_records, a6_records, aaaa_records); #endif /* 0 */ array(string) names=({}); array(string) ips=({}); if (a_records) { foreach(a_records->an, mapping x) { if(x->name) names+=({x->name}); if(x->a) ips+=({x->a}); } } // Prefer a6 to aaaa. if (a6_records) { foreach(a6_records->an, mapping x) { if(x->name) names+=({x->name}); if(x->a6) ips+=({x->a6}); } } if (aaaa_records) { foreach(aaaa_records->an, mapping x) { if(x->name) names+=({x->name}); if(x->aaaa) ips+=({x->aaaa}); } } return ({ sizeof(names)?names[0]:0, ips, names, }); } //! Queries the service record (RFC 2782) from the default or given //! DNS server. The result is an array of arrays with the //! following six elements for each record. The array is //! sorted according to the priority of each record. //! //! Each element of the array returned represents a service //! record. Each service record contains the following: //! //! @returns //! An array with the requested information about the specified //! service. //! //! @array //! @elem int priority //! Priority //! @elem int weight //! Weight in event of multiple records with same priority. //! @elem int port //! port number //! @elem string target //! target dns name //! @endarray //! array getsrvbyname(string service, string protocol, string|void name) { mapping m; if(!service) error("no service name specified."); if(!protocol) error("no service name specified."); if(sizeof(domains) && !name) { // we haven't provided a target domain to search on. // we probably shouldn't do a searchdomains search, // as it might return ambiguous results. m = do_sync_query( mkquery("_" + service +"._"+ protocol + "." + name, C_IN, T_SRV)); if(!m || !m->an || !sizeof(m->an)) foreach(domains, string domain) { m = do_sync_query( mkquery("_" + service +"._"+ protocol + "." + domain, C_IN, T_SRV)); if(m && m->an && sizeof(m->an)) break; } } else { m = do_sync_query( mkquery("_" + service +"._"+ protocol + "." + name, C_IN, T_SRV)); } if (!m) { // no entries. return ({}); } array res=({}); foreach(m->an, mapping x) { res+=({({x->priority, x->weight, x->port, x->target})}); } // now we sort the array by priority as a convenience array y=({}); foreach(res, array t) y+=({t[0]}); sort(y, res); return res; } string arpa_from_ip(string ip) { if(has_value(ip,':')) { string raw_ipv6 = make_raw_addr6(ip); return reverse(sprintf("%@02X", values(raw_ipv6)))/1*"."+".IP6.ARPA"; } else return reverse(ip/".")*"."+".IN-ADDR.ARPA"; } string ip_from_arpa(string arpa) { array(string) parts = reverse(arpa/"."); if(sizeof(parts)<2) return ""; if(lower_case(parts[1]) == "ip6") return map(parts[2..]/4, `*, "")*":"; else return parts[2..]*"."; } //! @decl array gethostbyaddr(string hostip) //! Queries the host name or ip from the default or given //! DNS server. The result is an array with three elements, //! //! @returns //! The requested data about the specified host. //! //! @array //! @elem string hostip //! The host IP. //! @elem array(string) ip //! IP number(s). //! @elem array(string) aliases //! DNS name(s). //! @endarray //! array gethostbyaddr(string s) { mapping m=do_sync_query(mkquery(arpa_from_ip(s), C_IN, T_PTR)); if (m) { array(string) names=({}); array(string) ips=({}); foreach(m->an, mapping x) { if(x->ptr) names+=({x->ptr}); if(x->name) { ips+=({ip_from_arpa(x->name)}); } } return ({ sizeof(names)?names[0]:0, ips, names, }); } else { // Lookup failed. return ({ 0, ({}), ({}) }); } } //! @decl string get_primary_mx(string hostname) //! Queries the primary mx for the host. //! @returns //! Returns the hostname of the primary mail exchanger. //! string get_primary_mx(string host) { mapping m; if(sizeof(domains) && host[-1] != '.' && sizeof(host/".") < 3) { m=do_sync_query(mkquery(host, C_IN, T_MX)); if(!m || !m->an || !sizeof(m->an)) foreach(domains, string domain) { m=do_sync_query(mkquery(host+"."+domain, C_IN, T_MX)); if(m && m->an && sizeof(m->an)) break; } } else { m=do_sync_query(mkquery(host, C_IN, T_MX)); } if (!m) { return 0; } int minpref=29372974; string ret; foreach(m->an, mapping m2) { if(m2->mx && m2->preference<minpref) { ret=m2->mx; minpref=m2->preference; } } return ret; } array(string) get_mx(string host) { mapping m; if(sizeof(domains) && host[-1] != '.' && sizeof(host/".") < 3) { m = do_sync_query(mkquery(host, C_IN, T_MX)); if(!m || !m->an || !sizeof(m->an)) { foreach(domains, string domain) { m = do_sync_query(mkquery(host+"."+domain, C_IN, T_MX)); if(m && m->an && sizeof(m->an)) break; } } } else { m = do_sync_query(mkquery(host, C_IN, T_MX)); } if (!m) { return 0; } array a = filter(m->an, `[], "mx"); array(string) b = column( a, "mx"); sort( column( a, "preference"), b); return b; } } #define REMOVE_DELAY 120 #define GIVE_UP_DELAY (RETRIES * RETRY_DELAY + REMOVE_DELAY)*2 // FIXME: Randomized source port! //! Asynchronous DNS client. class async_client { inherit client; inherit Stdio.UDP : udp; async_client next_client; class Request { string req; string domain; function callback; int retries; int timestamp; array args; mixed retry_co; }; mapping requests=([]); protected private void remove(object(Request) r) { if(!r) return; sscanf(r->req,"%2c",int id); m_delete(requests,id); if (r->retry_co) remove_call_out(r->retry_co); r->retry_co = UNDEFINED; r->callback(r->domain,0,@r->args); destruct(r); } void retry(object(Request) r, void|int nsno) { if(!r) return; if (nsno >= sizeof(nameservers)) { if(r->retries++ > RETRIES) { r->retry_co = call_out(remove, REMOVE_DELAY, r); return; } else { nsno = 0; } } r->retry_co = call_out(retry, RETRY_DELAY, r, nsno+1); udp::send(nameservers[nsno], 53, r->req); } void do_query(string domain, int cl, int type, function(string,mapping,mixed...:void) callback, mixed ... args) { for(int e=next_client ? 100 : 256;e>=0;e--) { int lid = random(65536); if(!catch { requests[lid]++; }) { string req=low_mkquery(lid,domain,cl,type); object r=Request(); r->req=req; r->domain=domain; r->callback=callback; r->args=args; r->timestamp=time(); r->retry_co = call_out(retry, RETRY_DELAY, r, 1); requests[lid] = r; udp::send(nameservers[0], 53, req); return; } } /* We failed miserably to find a request id to use, * so we create a second UDP port to be able to have more * requests 'in the air'. /Hubbe */ if(!next_client) next_client=async_client(nameservers,domains); next_client->do_query(domain, cl, type, callback, @args); } protected private void rec_data(mapping m) { mixed err; if (err = catch { if(m->port != 53 || !has_value(nameservers, m->ip)) return; sscanf(m->data,"%2c",int id); object r=requests[id]; if(!r) return; m_delete(requests,id); r->callback(r->domain,decode_res(m->data),@r->args); destruct(r); }) { werror("DNS: Failed to read UDP packet. Connection refused?\n%s\n", describe_backtrace(err)); } } protected private void generic_get(string d, mapping answer, int multi, int all, int type, string field, string domain, function callback, mixed ... args) { if(!answer || !answer->an || !sizeof(answer->an)) { if(multi == -1 || multi >= sizeof(domains)) { // Either a request without multi (ip, or FQDN) or we have tried all // domains. callback(domain,0,@args); } else { // Multiple domain request. Try the next one... do_query(domain+"."+domains[multi], C_IN, type, generic_get, ++multi, all, type, field, domain, callback, @args); } } else { if (all) { callback(domain, answer->an, @args); } else { foreach(answer->an, array an) if(an[field]) { callback(domain, an[field], @args); return; } callback(domain,0,@args); return; } } } //! void host_to_ip(string host, function callback, mixed ... args) { if(sizeof(domains) && host[-1] != '.' && sizeof(host/".") < 3) { do_query(host, C_IN, T_A, generic_get, 0, 0, T_A, "a", host, callback, @args ); } else { do_query(host, C_IN, T_A, generic_get, -1, 0, T_A, "a", host, callback, @args); } } //! void ip_to_host(string ip, function callback, mixed ... args) { do_query(arpa_from_ip(ip), C_IN, T_PTR, generic_get, -1, 0, T_PTR, "ptr", ip, callback, @args); } //! void get_mx_all(string host, function callback, mixed ... args) { if(sizeof(domains) && host[-1] != '.' && sizeof(host/".") < 3) { do_query(host, C_IN, T_MX, generic_get, 0, 1, T_MX, "mx", host, callback, @args); } else { do_query(host, C_IN, T_MX, generic_get, -1, 1, T_MX, "mx", host, callback, @args); } } //! void get_mx(string host, function callback, mixed ... args) { get_mx_all(host, lambda(string domain, array(mapping) mx, function callback, mixed ... args) { array a; if (mx) { a = column(mx, "mx"); sort(column(mx, "preference"), a); } callback(a, @args); }, callback, @args); } //! Close the client. //! //! @note //! All active requests are aborted. void close() { foreach(requests; ; Request r) { remove(r); } udp::close(); udp::set_read_callback(0); } void create(void|string|array(string) server, void|string|array(string) domain) { int i; // Attempt to randomize the source port. for (i = 0; i < RETRIES; i++) { if (safe_bind(udp::this, 1024 + random(65536-1024), ANY)) break; } if((i >= RETRIES) && !safe_bind(udp::this, 0, ANY) && !safe_bind(udp::this, 0)) error( "DNS: failed to bind a port.\n" ); #if 0 werror("Protocols.DNS.async_client(%O, %O)\n" "UDP Address: %s\n" "%s\n", server, domain, udp::query_address(), describe_backtrace(backtrace())); #endif /* 0 */ udp::set_read_callback(rec_data); ::create(server,domain); } }; async_client global_async_client; #define GAC(X) \ void async_##X( string host, function callback, mixed ... args ) \ { \ if( !global_async_client ) \ global_async_client = async_client(); \ global_async_client->X(host,callback,@args); \ } //! @ignore GAC(ip_to_host); //! @endignore //! @decl void async_ip_to_host(string ip, function cb, mixed ... cba) //! @ignore GAC(host_to_ip); //! @endignore //! @decl void async_host_to_ip(string host, function cb, mixed ... cba) //! @ignore GAC(get_mx_all); //! @endignore //! @decl void async_get_mx_all(string host, function cb, mixed ... cba) //! @ignore GAC(get_mx); //! @endignore //! @decl void async_get_mx(string host, function cb, mixed ... cba) client global_client; #define GC(X) \ mixed X( string host ) \ { \ if( !global_client ) \ global_client = client(); \ return global_client->X(host); \ } //! @ignore GC(gethostbyname); //! @endignore //! @decl array gethostbyname(string host) //! @ignore GC(gethostbyaddr); //! @endignore //! @decl array gethostbyaddr(string host) //! @ignore GC(get_mx); //! @endignore //! @decl string get_mx(string host) //! @ignore GC(get_primary_mx); //! @endignore //! @decl string get_primary_mx(string host)

pike.git/ lib/ modules/ Protocols.pmod/ DNS.pmod > f93b6fe3c8660468dfc028b873ada16716c24e99 [Annotate]