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

2008-07-23

2008-07-23 15:11:21 by Henrik Grubbström (Grubba) <grubba@grubba.org>

• 863037e0136b499e41eb0711d9cdb642aade8554 (154 lines) (+135/-19) ^{[ Show | Annotate ]}
  Branch: 7.9

Added some minimal documentation about the return value of decode_entries().
Fixed some decoding issues for SRV-records.

Rev: lib/modules/Protocols.pmod/DNS.pmod:1.99

1: - // $Id: DNS.pmod,v 1.98 2008/07/22 15:34:15 grubba Exp $ + // $Id: DNS.pmod,v 1.99 2008/07/23 15:11:21 grubba Exp $   // Not yet finished -- Fredrik Hubinette      //! Domain Name System - //! RFC 1035 + //! RFC 1034, RFC 1035 and RFC 2308 + //!      #pike __REAL_VERSION__   
11:   final constant SERVFAIL=2;   final constant NXDOMAIN=3;   final constant NOTIMPL=4; + final constant REFUSED=5;   final constant NXRRSET=8;      final constant QUERY=0;
338:    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" +  //! @endmapping +  //! @endint +  //! @endarray    array decode_entries(string s,int num, array(int) next)    {    array(string) ret=({});
371:    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]) -  { +     if(x[0][0..0]=="_")    m->service=x[0][1..];    else    m->service=x[0]; -  } -  if(x[1]) +  +  if(sizeof(x) > 1)    {    if(x[1][0..0]=="_")    m->proto=x[1][1..];    else    m->proto=x[1];    } -  if(x[2]) -  { -  if(x[2][0..0]=="_") -  x[2]=x[2][1..]; -  m->name=x[2..]*"."; -  } +     -  +  m->name=x[2..]*".";    break;    case T_A:    m->a=sprintf("%{.%d%}",values(s[next[0]..next[0]+m->len-1]))[1..];
492:   //! Implements a Domain Name Service (DNS) server.   class server   { +  //!    inherit protocol; -  +     inherit Stdio.UDP : udp;       protected void send_reply(mapping r, mapping q, mapping m)
523:    //! Returns @expr{0@} (zero) on failure, or a result mapping on success:    //! @mapping    //! @member int "rcode" -  //! @member array(mapping(string:string|int))|void "qd" +  //! @member array(mapping(string:string|int))|void "an"    //! @array    //! @elem mapping(string:string|int) entry    //! @mapping
532:    //! @member int "cl"    //! @endmapping    //! @endarray -  //! @member array|void "an" +  //! @member array|void "qd"    //! @member array|void "ns"    //! @member array|void "ar"    //! @endmapping