6790812000-12-05Honza Petrous //: SNMP protocol implementation for Pike //: //: Honza Petrous, 2000-10-07 (on the 'coding party' after user conference :) //: //: RFC: //: implemented (yet):
b399dd2001-03-30Honza Petrous //: 1155-7 : v1 //: 1901-4 : v2/community (Bulk ops aren't implemented!)
6790812000-12-05Honza Petrous //: planned:
b399dd2001-03-30Honza Petrous // 2742 : agentX //: 2570 : v3 description
6790812000-12-05Honza Petrous //:
6658ef2001-09-11Honza Petrous // $Id: protocol.pike,v 1.3 2001/09/11 13:39:19 hop Exp $
b399dd2001-03-30Honza Petrous 
6790812000-12-05Honza Petrous  #include "snmp_globals.h" #include "snmp_errors.h" #if 1 // --- ASN.1 hack class asn1_application_octet_string { inherit Standards.ASN1.Types.asn1_octet_string; constant cls = 1; constant type_name = "APPLICATION OCTET_STRING"; int tagx; int get_tag() { return tagx; } void init(int tagid, string arg) { ::value = arg; tagx = tagid; } } class asn1_application_integer { inherit Standards.ASN1.Types.asn1_integer; constant cls = 1; constant type_name = "APPLICATION INTEGER"; int tagx; int get_tag() { return tagx; } void init(int tagid, int arg) { ::init(arg); tagx = tagid; } } object|mapping der_decode(object data, mapping types) { int raw_tag = data->get_uint(1); int len; string contents; if ( (raw_tag & 0x1f) == 0x1f) error("ASN1.Decode: High tag numbers is not supported\n"); len = data->get_uint(1); if (len & 0x80) len = data->get_uint(len & 0x7f); contents = data->get_fix_string(len); int tag = raw_tag & 0xdf; // Class and tag bits
b399dd2001-03-30Honza Petrous //werror(sprintf("DEBx: tag=%O\n",tag));
6790812000-12-05Honza Petrous  program p = types[tag]; if (raw_tag & 0x20) { /* Constructed encoding */ array elements = ({ }); object struct = ADT.struct(contents); if (!p) { while (!struct->is_empty()) elements += ({ der_decode(struct, types) }); return Standards.ASN1.Decode.constructed(tag, contents, elements); } object res = p(); // hop: For non-universal classes we provide tag number if(tag & 0xC0) res = p(tag & 0x1F, ({})); res->begin_decode_constructed(contents); int i; /* Ask object which types it expects for field i, decode it, and * record the decoded object */ for(i = 0; !struct->is_empty(); i++) { res->decode_constructed_element (i, der_decode(struct, res->element_types(i, types))); } return res->end_decode_constructed(i); } else { /* Primitive encoding */ return p ? p()->decode_primitive(contents) : Standards.ASN1.Decode.primitive(tag, contents); } } static mapping snmp_type_proc = ([ 1 : Standards.ASN1.Types.asn1_boolean, 2 : Standards.ASN1.Types.asn1_integer, 3 : Standards.ASN1.Types.asn1_bit_string, 4 : Standards.ASN1.Types.asn1_octet_string, 5 : Standards.ASN1.Types.asn1_null, 6 : Standards.ASN1.Types.asn1_identifier, // 9 : asn1_real, //10 : asn1_enumerated, 16 : Standards.ASN1.Types.asn1_sequence, 17 : Standards.ASN1.Types.asn1_set, 19 : Standards.ASN1.Types.asn1_printable_string, 20 : Standards.ASN1.Types.asn1_teletex_string, 23 : Standards.ASN1.Types.asn1_utc,
b399dd2001-03-30Honza Petrous  // from RFC-1065 :
6790812000-12-05Honza Petrous  64 : asn1_application_octet_string, // ipaddress 65 : asn1_application_integer, // counter 66 : asn1_application_integer, // gauge 67 : asn1_application_integer, // timeticks
b399dd2001-03-30Honza Petrous  68 : asn1_application_octet_string, // opaque // v2 70 : asn1_application_integer, // counter64 // context PDU 128 : Protocols.LDAP.ldap_privates.asn1_context_sequence, 129 : Protocols.LDAP.ldap_privates.asn1_context_sequence, 130 : Protocols.LDAP.ldap_privates.asn1_context_sequence, 131 : Protocols.LDAP.ldap_privates.asn1_context_sequence
6790812000-12-05Honza Petrous  ]); object|mapping snmp_der_decode(string data) { return /*Standards.ASN1.Decode.*/der_decode(ADT.struct(data), snmp_type_proc); } // --- end of hack #endif inherit Stdio.UDP : snmp; //: //: public vars //: //: //: private variables //:
6658ef2001-09-11Honza Petrous int port; // = SNMP_DEFAULT_PORT;
6790812000-12-05Honza Petrous string local_host = SNMP_DEFAULT_HOST; string remote_host; int request_id = 1; int next_id = 1; int snmp_version = SNMP_DEFAULT_VERSION; string snmp_community = SNMP_DEFAULT_COMMUNITY; int snmp_errno = SNMP_SUCCESS; int ok; //: //: msg pool //: mapping msgpool = ([]); //: //: callback support //: function con_ok, con_fail; array extra_args; //: //: create //: //: *_port: local and remote UDP port //: *_addr: local and remote address //: void create(int|void rem_port, string|void rem_addr, int|void loc_port, string|void loc_addr) { int lport = loc_port; local_host = (!loc_addr || !sizeof(loc_addr)) ? SNMP_DEFAULT_LOCHOST : loc_addr; if(stringp(rem_addr) && sizeof(rem_addr)) remote_host = rem_addr; if (!snmp::bind(lport, local_host)) { //# error ... DWRITE("protocol.create: can't bind to the socket.\n"); ok = 0; if(con_fail) con_fail(this_object(), @extra_args); } if(snmp_errno) THROW(({"Failed to bind to SNMP port.\n", backtrace()})); DWRITE("protocol.bind: success!\n"); DWRITE(sprintf("protocol.create: local adress:port binded: [%s:%d].\n", local_host, lport)); } mapping readmsg() { //: returns the whole SNMP message in raw format mapping rv; rv = read(); return(rv); }
b399dd2001-03-30Honza Petrous mapping decode_asn1_msg(mapping rawd) { //: decode ASN1 data, if garbaged ignore it
6790812000-12-05Honza Petrous  object xdec = snmp_der_decode(rawd->data); string msgid = (string)xdec->elements[2]->elements[0]->value; int errno = xdec->elements[2]->elements[1]->value; mapping msg = ([ "ip":rawd->ip, "port":rawd->port, "error-status":errno, "error-string":snmp_errlist[errno], "error-index":xdec->elements[2]->elements[2]->value,
b399dd2001-03-30Honza Petrous  "version":xdec->elements[0]->value, "community":xdec->elements[1]->value, "op":xdec->elements[2]->get_tag(),
6790812000-12-05Honza Petrous  "attribute":Array.map(xdec->elements[2]->elements[3]->elements, lambda(object duo) { return(([(array(string))(duo->elements[0]->id)*".":duo->elements[1]->value])); } ) ]);
b399dd2001-03-30Honza Petrous  return(([msgid:msg])); } void to_pool(mapping rawd) { //: put decoded msg to the pool msgpool += decode_asn1_msg(rawd);
6790812000-12-05Honza Petrous  } mapping|int from_pool(string msgid) { //: get data from poll mapping msg; if(zero_type(msgpool[msgid])) return 0; msg = msgpool[msgid]; msgpool -= ([msgid:msg]); return(msg); } mapping readmsg_from_pool(int msgid) { //: read SNMP response PDU from PDU pool mapping rv = from_pool((string)msgid); if(rv) return(rv); #define HACK 1 #ifdef HACK mapping tmpm = readmsg(); to_pool(tmpm); #endif return(from_pool((string)msgid)); } int writemsg(string rem_addr, int rem_port, object pdu) { //: send SNMP encoded message and return status //: OK, in most cases :) object msg; string rawd; int msize; msg = Standards.ASN1.Types.asn1_sequence(({ Standards.ASN1.Types.asn1_integer(snmp_version-1), Standards.ASN1.Types.asn1_octet_string(snmp_community), pdu})); rawd = msg->get_der(); DWRITE(sprintf("protocol.writemsg: %O\n", rawd)); msize = send(rem_addr, rem_port, rawd); return(msize = sizeof(rawd) ? SNMP_SUCCESS : SNMP_SEND_ERROR); } int get_req_id() { //: returns unicate id //LOCK int rv = request_id++; //UNLOCK return(rv); } //:
b399dd2001-03-30Honza Petrous //: read_response
6790812000-12-05Honza Petrous //:
b399dd2001-03-30Honza Petrous array(mapping)|int read_response(int msgid) {
6790812000-12-05Honza Petrous  //: GetResponse-PDU low call mapping rawpdu = readmsg_from_pool(msgid); return(({rawpdu})); } //: //: get_request //: int get_request(array(string) varlist, string|void rem_addr, int|void rem_port) { //: GetRequest-PDU low call object pdu; int id = get_req_id(), flg; array vararr = ({}); foreach(varlist, string varname) vararr += ({Standards.ASN1.Types.asn1_sequence(
6658ef2001-09-11Honza Petrous  ({Standards.ASN1.Types.asn1_identifier( @Array.map(varname/".", lambda(string el){ return((int)el);})),
6790812000-12-05Honza Petrous  Standards.ASN1.Types.asn1_integer(1)}) //doesn't sense but req )}); pdu = Protocols.LDAP.ldap_privates.asn1_context_sequence(0,
6658ef2001-09-11Honza Petrous  ({Standards.ASN1.Types.asn1_integer(id), // request-id Standards.ASN1.Types.asn1_integer(0), // error-status Standards.ASN1.Types.asn1_integer(0), // error-index Standards.ASN1.Types.asn1_sequence(vararr)}) );
6790812000-12-05Honza Petrous  // now we have PDU ...
6658ef2001-09-11Honza Petrous  flg = writemsg(rem_addr||remote_host, rem_port || port || SNMP_DEFAULT_PORT, pdu);
6790812000-12-05Honza Petrous  return id; }
b399dd2001-03-30Honza Petrous object mk_asn1_val(string type, int|string val) { // returns appropriate ASN.1 value object rv; switch(type) { case "oid": // OID rv = Standards.ASN1.Types.asn1_identifier( @Array.map(val/".", lambda(string el){ return((int)el);})); break; case "int": // INTEGER rv = Standards.ASN1.Types.asn1_integer(val); break; case "str": // STRING rv = Standards.ASN1.Types.asn1_octet_string(val); break; case "ipaddr": // ipAddress rv = asn1_application_octet_string(0,val[..3]); break; case "count": // COUNTER rv = asn1_application_integer(1,val); break; case "gauge": // GAUGE rv = asn1_application_integer(2,val); break; case "tick": // TICK rv = asn1_application_integer(3,val); break; case "opaque": // OPAQUE rv = asn1_application_octet_string(4,val); break; case "count64": // COUNTER64 - v2 object rv = asn1_application_integer(6,val); break; default: // bad type! return 0; } return rv; } //: //: get_response //: int get_response(mapping varlist, mapping origdata, int|void errcode, int|void erridx) { //: GetResponse-PDU low call object pdu; int id = indices(origdata)[0], flg; array vararr = ({}); foreach(indices(varlist), string varname) if(arrayp(varlist[varname]) || sizeof(varlist[varname]) > 1) { vararr += ({Standards.ASN1.Types.asn1_sequence( ({Standards.ASN1.Types.asn1_identifier( @Array.map(varname/".", lambda(string el){ return((int)el);})), mk_asn1_val(varlist[varname][0], varlist[varname][1])}) )}); } pdu = Protocols.LDAP.ldap_privates.asn1_context_sequence(2,
6658ef2001-09-11Honza Petrous  ({Standards.ASN1.Types.asn1_integer(id), // request-id Standards.ASN1.Types.asn1_integer(errcode), // error-status Standards.ASN1.Types.asn1_integer(erridx), // error-index Standards.ASN1.Types.asn1_sequence(vararr)}) );
b399dd2001-03-30Honza Petrous  // now we have PDU ...
6658ef2001-09-11Honza Petrous  flg = writemsg(origdata[id]->ip||remote_host, origdata[id]->port || port || SNMP_DEFAULT_PORT, pdu);
b399dd2001-03-30Honza Petrous  return id; }
6790812000-12-05Honza Petrous  //: //: get_nextrequest //: int get_nextrequest(array(string) varlist, string|void rem_addr, int|void rem_port) { //: GetNextRequest-PDU low call object pdu; int id = get_req_id(), flg; array vararr = ({}); foreach(varlist, string varname) vararr += ({Standards.ASN1.Types.asn1_sequence(
6658ef2001-09-11Honza Petrous  ({Standards.ASN1.Types.asn1_identifier( @Array.map(varname/".", lambda(string el){ return((int)el);})),
6790812000-12-05Honza Petrous  Standards.ASN1.Types.asn1_integer(1)}) //doesn't sense but req )}); pdu = Protocols.LDAP.ldap_privates.asn1_context_sequence(1,
6658ef2001-09-11Honza Petrous  ({Standards.ASN1.Types.asn1_integer(id), // request-id Standards.ASN1.Types.asn1_integer(0), // error-status Standards.ASN1.Types.asn1_integer(0), // error-index Standards.ASN1.Types.asn1_sequence(vararr)}) );
6790812000-12-05Honza Petrous  // now we have PDU ...
6658ef2001-09-11Honza Petrous  flg = writemsg(rem_addr||remote_host, rem_port || port || SNMP_DEFAULT_PORT, pdu);
6790812000-12-05Honza Petrous  return id; }
b399dd2001-03-30Honza Petrous //: //: set_request //: int set_request(mapping varlist, string|void rem_addr, int|void rem_port) { //: SetRequest-PDU low call object pdu; int id = get_req_id(), flg; array vararr = ({});
6790812000-12-05Honza Petrous 
b399dd2001-03-30Honza Petrous  foreach(indices(varlist), string varname) vararr += ({Standards.ASN1.Types.asn1_sequence( ({Standards.ASN1.Types.asn1_identifier( @Array.map(varname/".", lambda(string el){ return((int)el);})), mk_asn1_val(varlist[varname][0], varlist[varname][1])}) )});
6790812000-12-05Honza Petrous 
b399dd2001-03-30Honza Petrous  pdu = Protocols.LDAP.ldap_privates.asn1_context_sequence(3,
6658ef2001-09-11Honza Petrous  ({Standards.ASN1.Types.asn1_integer(id), // request-id Standards.ASN1.Types.asn1_integer(0), // error-status Standards.ASN1.Types.asn1_integer(0), // error-index Standards.ASN1.Types.asn1_sequence(vararr)}) );
6790812000-12-05Honza Petrous 
b399dd2001-03-30Honza Petrous  // now we have PDU ...
6658ef2001-09-11Honza Petrous  flg = writemsg(rem_addr||remote_host, rem_port || port || SNMP_DEFAULT_PORT, pdu);
6790812000-12-05Honza Petrous 
b399dd2001-03-30Honza Petrous  return id;
6790812000-12-05Honza Petrous } //:
b399dd2001-03-30Honza Petrous //: trap
6790812000-12-05Honza Petrous //:
6658ef2001-09-11Honza Petrous int trap(mapping varlist, string oid, int type, int spectype, int ticks, string|void locip, string|void remaddr, int|void remport) {
b399dd2001-03-30Honza Petrous  //: Trap-PDU low call
6790812000-12-05Honza Petrous  object pdu; int id = get_req_id(), flg; array vararr = ({});
6658ef2001-09-11Honza Petrous  string lip = "1234"; // DWRITE(sprintf("protocols.trap: varlist: %O, oid: %O, type: %O, spectype: %O," // " ticks: %O, locip: %O, remaddr: %O, remport: %O\n", // varlist, oid, type, spectype, ticks, locip, remaddr, remport)); locip = locip || "0.0.0.0"; if (sizeof(locip/".") != 4) locip = "0.0.0.0"; //FIXME: what for hell I want to do with such ugly value? //sscanf(locip, "%d.%d.%d.%d", @lip); sscanf(locip, "%d.%d.%d.%d", lip[0], lip[1], lip[2], lip[3]);
6790812000-12-05Honza Petrous  foreach(indices(varlist), string varname) vararr += ({Standards.ASN1.Types.asn1_sequence(
b399dd2001-03-30Honza Petrous  ({Standards.ASN1.Types.asn1_identifier( @Array.map(varname/".", lambda(string el){ return((int)el);})), mk_asn1_val(varlist[varname][0], varlist[varname][1])})
6790812000-12-05Honza Petrous  )});
b399dd2001-03-30Honza Petrous  pdu = Protocols.LDAP.ldap_privates.asn1_context_sequence(4,
6658ef2001-09-11Honza Petrous  ({ mk_asn1_val("oid", oid), // enterprise OID mk_asn1_val("ipaddr", lip), // ip address (UGLY!) mk_asn1_val("int", type), // type (0 = coldstart, ...) mk_asn1_val("int", spectype), // enterprise type mk_asn1_val("tick", ticks), // uptime Standards.ASN1.Types.asn1_sequence(vararr) // optional vars }) );
6790812000-12-05Honza Petrous  // now we have PDU ...
6658ef2001-09-11Honza Petrous  flg = writemsg(remaddr||remote_host, remport || port || SNMP_DEFAULT_TRAPPORT, pdu);
6790812000-12-05Honza Petrous  return id; }