mirror of
https://github.com/cgrates/cgrates.git
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364 lines
13 KiB
Go
364 lines
13 KiB
Go
/*
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Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
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Copyright (C) ITsysCOM GmbH
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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package agents
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import (
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"crypto/tls"
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"fmt"
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"strings"
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"github.com/cgrates/cgrates/config"
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"github.com/cgrates/cgrates/engine"
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"github.com/cgrates/cgrates/sessions"
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"github.com/cgrates/cgrates/utils"
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"github.com/miekg/dns"
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)
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// NewDNSAgent is the constructor for DNSAgent
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func NewDNSAgent(cgrCfg *config.CGRConfig, fltrS *engine.FilterS,
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connMgr *engine.ConnManager) (da *DNSAgent, err error) {
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da = &DNSAgent{cgrCfg: cgrCfg, fltrS: fltrS, connMgr: connMgr}
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err = da.initDNSServer()
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return
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}
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// DNSAgent translates DNS requests towards CGRateS infrastructure
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type DNSAgent struct {
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cgrCfg *config.CGRConfig // loaded CGRateS configuration
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fltrS *engine.FilterS // connection towards FilterS
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server *dns.Server
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connMgr *engine.ConnManager
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}
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// initDNSServer instantiates the DNS server
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func (da *DNSAgent) initDNSServer() (err error) {
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handler := dns.HandlerFunc(func(w dns.ResponseWriter, m *dns.Msg) {
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go da.handleMessage(w, m)
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})
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if strings.HasSuffix(da.cgrCfg.DNSAgentCfg().ListenNet, utils.TLSNoCaps) {
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cert, err := tls.LoadX509KeyPair(da.cgrCfg.TlsCfg().ServerCerificate, da.cgrCfg.TlsCfg().ServerKey)
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if err != nil {
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return err
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}
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config := tls.Config{
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Certificates: []tls.Certificate{cert},
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}
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da.server = &dns.Server{
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Addr: da.cgrCfg.DNSAgentCfg().Listen,
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Net: "tcp-tls",
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TLSConfig: &config,
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Handler: handler,
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}
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} else {
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da.server = &dns.Server{Addr: da.cgrCfg.DNSAgentCfg().Listen, Net: da.cgrCfg.DNSAgentCfg().ListenNet, Handler: handler}
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}
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return
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}
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// ListenAndServe will run the DNS handler doing also the connection to listen address
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func (da *DNSAgent) ListenAndServe() (err error) {
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utils.Logger.Info(fmt.Sprintf("<%s> start listening on <%s:%s>",
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utils.DNSAgent, da.cgrCfg.DNSAgentCfg().ListenNet, da.cgrCfg.DNSAgentCfg().Listen))
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return da.server.ListenAndServe()
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}
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// Reload will reinitialize the server
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// this is in order to monitor if we receive error on ListenAndServe
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func (da *DNSAgent) Reload() (err error) {
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return da.initDNSServer()
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}
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// handleMessage is the entry point of all DNS requests
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// requests are reaching here asynchronously
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func (da *DNSAgent) handleMessage(w dns.ResponseWriter, req *dns.Msg) {
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dnsDP := newDNSDataProvider(req, w)
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reqVars := make(utils.NavigableMap2)
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reqVars[QueryType] = utils.NewNMData(dns.TypeToString[req.Question[0].Qtype])
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rply := new(dns.Msg)
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rply.SetReply(req)
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// message preprocesing
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switch req.Question[0].Qtype {
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case dns.TypeNAPTR:
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reqVars[QueryName] = utils.NewNMData(req.Question[0].Name)
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e164, err := e164FromNAPTR(req.Question[0].Name)
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if err != nil {
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utils.Logger.Warning(
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fmt.Sprintf("<%s> decoding NAPTR query: <%s>, err: %s",
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utils.DNSAgent, req.Question[0].Name, err.Error()))
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rply.Rcode = dns.RcodeServerFailure
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dnsWriteMsg(w, rply)
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return
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}
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reqVars[E164Address] = utils.NewNMData(e164)
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reqVars[DomainName] = utils.NewNMData(domainNameFromNAPTR(req.Question[0].Name))
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}
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reqVars[utils.RemoteHost] = utils.NewNMData(w.RemoteAddr().String())
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cgrRplyNM := utils.NavigableMap2{}
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rplyNM := utils.NewOrderedNavigableMap() // share it among different processors
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var processed bool
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var err error
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for _, reqProcessor := range da.cgrCfg.DNSAgentCfg().RequestProcessors {
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var lclProcessed bool
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lclProcessed, err = da.processRequest(
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reqProcessor,
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NewAgentRequest(
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dnsDP, reqVars, &cgrRplyNM, rplyNM,
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reqProcessor.Tenant,
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da.cgrCfg.GeneralCfg().DefaultTenant,
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utils.FirstNonEmpty(da.cgrCfg.DNSAgentCfg().Timezone,
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da.cgrCfg.GeneralCfg().DefaultTimezone),
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da.fltrS, nil, nil))
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if lclProcessed {
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processed = lclProcessed
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}
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if err != nil ||
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(lclProcessed && !reqProcessor.Flags.GetBool(utils.MetaContinue)) {
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break
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}
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}
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if err != nil {
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utils.Logger.Warning(
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fmt.Sprintf("<%s> error: %s processing message: %s from %s",
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utils.DNSAgent, err.Error(), req, w.RemoteAddr()))
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rply.Rcode = dns.RcodeServerFailure
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dnsWriteMsg(w, rply)
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return
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} else if !processed {
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utils.Logger.Warning(
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fmt.Sprintf("<%s> no request processor enabled, ignoring message %s from %s",
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utils.DNSAgent, req, w.RemoteAddr()))
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rply.Rcode = dns.RcodeServerFailure
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dnsWriteMsg(w, rply)
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return
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}
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if err = updateDNSMsgFromNM(rply, rplyNM); err != nil {
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utils.Logger.Warning(
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fmt.Sprintf("<%s> error: %s updating answer: %s from NM %s",
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utils.DNSAgent, err.Error(), utils.ToJSON(rply), utils.ToJSON(rplyNM)))
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rply.Rcode = dns.RcodeServerFailure
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dnsWriteMsg(w, rply)
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return
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}
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if err = dnsWriteMsg(w, rply); err != nil { // failed sending, most probably content issue
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rply = new(dns.Msg)
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rply.SetReply(req)
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rply.Rcode = dns.RcodeServerFailure
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dnsWriteMsg(w, rply)
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}
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return
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}
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func (da *DNSAgent) processRequest(reqProcessor *config.RequestProcessor,
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agReq *AgentRequest) (processed bool, err error) {
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if pass, err := da.fltrS.Pass(agReq.Tenant,
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reqProcessor.Filters, agReq); err != nil || !pass {
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return pass, err
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}
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if err = agReq.SetFields(reqProcessor.RequestFields); err != nil {
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return
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}
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cgrEv := config.NMAsCGREvent(agReq.CGRRequest, agReq.Tenant, utils.NestingSep)
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var reqType string
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for _, typ := range []string{
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utils.MetaDryRun, utils.MetaAuth,
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utils.MetaInitiate, utils.MetaUpdate,
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utils.MetaTerminate, utils.MetaMessage,
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utils.MetaCDRs, utils.MetaEvent, utils.META_NONE} {
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if reqProcessor.Flags.HasKey(typ) { // request type is identified through flags
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reqType = typ
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break
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}
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}
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cgrArgs := cgrEv.ExtractArgs(reqProcessor.Flags.HasKey(utils.MetaDispatchers),
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reqType == utils.MetaAuth || reqType == utils.MetaMessage || reqType == utils.MetaEvent)
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if reqProcessor.Flags.HasKey(utils.MetaLog) {
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utils.Logger.Info(
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fmt.Sprintf("<%s> LOG, processorID: <%s>, message: %s",
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utils.DNSAgent, reqProcessor.ID, agReq.Request.String()))
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}
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switch reqType {
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default:
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return false, fmt.Errorf("unknown request type: <%s>", reqType)
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case utils.META_NONE: // do nothing on CGRateS side
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case utils.MetaDryRun:
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utils.Logger.Info(
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fmt.Sprintf("<%s> DRY_RUN, processorID: %s, CGREvent: %s",
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utils.DNSAgent, reqProcessor.ID, utils.ToJSON(cgrEv)))
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case utils.MetaAuth:
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authArgs := sessions.NewV1AuthorizeArgs(
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reqProcessor.Flags.HasKey(utils.MetaAttributes),
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reqProcessor.Flags.ParamsSlice(utils.MetaAttributes),
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reqProcessor.Flags.HasKey(utils.MetaThresholds),
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reqProcessor.Flags.ParamsSlice(utils.MetaThresholds),
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reqProcessor.Flags.HasKey(utils.MetaStats),
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reqProcessor.Flags.ParamsSlice(utils.MetaStats),
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reqProcessor.Flags.HasKey(utils.MetaResources),
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reqProcessor.Flags.HasKey(utils.MetaAccounts),
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reqProcessor.Flags.HasKey(utils.MetaSuppliers),
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reqProcessor.Flags.HasKey(utils.MetaSuppliersIgnoreErrors),
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reqProcessor.Flags.HasKey(utils.MetaSuppliersEventCost),
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cgrEv, cgrArgs.ArgDispatcher, *cgrArgs.SupplierPaginator,
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reqProcessor.Flags.HasKey(utils.MetaFD),
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)
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rply := new(sessions.V1AuthorizeReply)
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err = da.connMgr.Call(da.cgrCfg.DNSAgentCfg().SessionSConns, nil,
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utils.SessionSv1AuthorizeEvent,
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authArgs, rply)
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rply.SetMaxUsageNeeded(authArgs.GetMaxUsage)
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if err = agReq.setCGRReply(rply, err); err != nil {
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return
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}
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case utils.MetaInitiate:
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initArgs := sessions.NewV1InitSessionArgs(
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reqProcessor.Flags.HasKey(utils.MetaAttributes),
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reqProcessor.Flags.ParamsSlice(utils.MetaAttributes),
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reqProcessor.Flags.HasKey(utils.MetaThresholds),
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reqProcessor.Flags.ParamsSlice(utils.MetaThresholds),
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reqProcessor.Flags.HasKey(utils.MetaStats),
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reqProcessor.Flags.ParamsSlice(utils.MetaStats),
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reqProcessor.Flags.HasKey(utils.MetaResources),
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reqProcessor.Flags.HasKey(utils.MetaAccounts),
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cgrEv, cgrArgs.ArgDispatcher,
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reqProcessor.Flags.HasKey(utils.MetaFD))
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rply := new(sessions.V1InitSessionReply)
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err = da.connMgr.Call(da.cgrCfg.DNSAgentCfg().SessionSConns, nil,
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utils.SessionSv1InitiateSession,
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initArgs, rply)
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rply.SetMaxUsageNeeded(initArgs.InitSession)
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if err = agReq.setCGRReply(rply, err); err != nil {
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return
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}
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case utils.MetaUpdate:
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updateArgs := sessions.NewV1UpdateSessionArgs(
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reqProcessor.Flags.HasKey(utils.MetaAttributes),
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reqProcessor.Flags.ParamsSlice(utils.MetaAttributes),
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reqProcessor.Flags.HasKey(utils.MetaAccounts),
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cgrEv, cgrArgs.ArgDispatcher,
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reqProcessor.Flags.HasKey(utils.MetaFD))
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rply := new(sessions.V1UpdateSessionReply)
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err = da.connMgr.Call(da.cgrCfg.DNSAgentCfg().SessionSConns, nil,
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utils.SessionSv1UpdateSession,
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updateArgs, rply)
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rply.SetMaxUsageNeeded(updateArgs.UpdateSession)
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if err = agReq.setCGRReply(rply, err); err != nil {
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return
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}
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case utils.MetaTerminate:
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terminateArgs := sessions.NewV1TerminateSessionArgs(
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reqProcessor.Flags.HasKey(utils.MetaAccounts),
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reqProcessor.Flags.HasKey(utils.MetaResources),
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reqProcessor.Flags.HasKey(utils.MetaThresholds),
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reqProcessor.Flags.ParamsSlice(utils.MetaThresholds),
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reqProcessor.Flags.HasKey(utils.MetaStats),
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reqProcessor.Flags.ParamsSlice(utils.MetaStats),
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cgrEv, cgrArgs.ArgDispatcher,
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reqProcessor.Flags.HasKey(utils.MetaFD))
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rply := utils.StringPointer("")
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err = da.connMgr.Call(da.cgrCfg.DNSAgentCfg().SessionSConns, nil,
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utils.SessionSv1TerminateSession,
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terminateArgs, rply)
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if err = agReq.setCGRReply(nil, err); err != nil {
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return
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}
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case utils.MetaMessage:
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evArgs := sessions.NewV1ProcessMessageArgs(
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reqProcessor.Flags.HasKey(utils.MetaAttributes),
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reqProcessor.Flags.ParamsSlice(utils.MetaAttributes),
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reqProcessor.Flags.HasKey(utils.MetaThresholds),
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reqProcessor.Flags.ParamsSlice(utils.MetaThresholds),
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reqProcessor.Flags.HasKey(utils.MetaStats),
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reqProcessor.Flags.ParamsSlice(utils.MetaStats),
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reqProcessor.Flags.HasKey(utils.MetaResources),
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reqProcessor.Flags.HasKey(utils.MetaAccounts),
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reqProcessor.Flags.HasKey(utils.MetaSuppliers),
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reqProcessor.Flags.HasKey(utils.MetaSuppliersIgnoreErrors),
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reqProcessor.Flags.HasKey(utils.MetaSuppliersEventCost),
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cgrEv, cgrArgs.ArgDispatcher, *cgrArgs.SupplierPaginator,
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reqProcessor.Flags.HasKey(utils.MetaFD))
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rply := new(sessions.V1ProcessMessageReply) // need it so rpcclient can clone
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err = da.connMgr.Call(da.cgrCfg.DNSAgentCfg().SessionSConns, nil,
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utils.SessionSv1ProcessMessage,
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evArgs, rply)
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if utils.ErrHasPrefix(err, utils.RalsErrorPrfx) {
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cgrEv.Event[utils.Usage] = 0 // avoid further debits
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} else if evArgs.Debit {
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cgrEv.Event[utils.Usage] = rply.MaxUsage // make sure the CDR reflects the debit
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}
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rply.SetMaxUsageNeeded(evArgs.Debit)
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if err = agReq.setCGRReply(rply, err); err != nil {
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return
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}
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case utils.MetaEvent:
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evArgs := &sessions.V1ProcessEventArgs{
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Flags: reqProcessor.Flags.SliceFlags(),
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CGREvent: cgrEv,
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ArgDispatcher: cgrArgs.ArgDispatcher,
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Paginator: *cgrArgs.SupplierPaginator,
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}
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rply := new(sessions.V1ProcessEventReply)
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err = da.connMgr.Call(da.cgrCfg.DNSAgentCfg().SessionSConns, nil,
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utils.SessionSv1ProcessEvent,
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evArgs, rply)
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needMaxUsage := needsMaxUsage(reqProcessor.Flags.ParamsSlice(utils.MetaRALs))
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if utils.ErrHasPrefix(err, utils.RalsErrorPrfx) {
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cgrEv.Event[utils.Usage] = 0 // avoid further debits
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} else if needMaxUsage {
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cgrEv.Event[utils.Usage] = rply.MaxUsage // make sure the CDR reflects the debit
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}
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rply.SetMaxUsageNeeded(needMaxUsage)
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if err = agReq.setCGRReply(rply, err); err != nil {
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return
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}
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case utils.MetaCDRs: // allow CDR processing
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}
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// separate request so we can capture the Terminate/Event also here
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if reqProcessor.Flags.HasKey(utils.MetaCDRs) &&
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!reqProcessor.Flags.HasKey(utils.MetaDryRun) {
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rplyCDRs := utils.StringPointer("")
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if err = da.connMgr.Call(da.cgrCfg.DNSAgentCfg().SessionSConns, nil,
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utils.SessionSv1ProcessCDR,
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&utils.CGREventWithArgDispatcher{CGREvent: cgrEv,
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ArgDispatcher: cgrArgs.ArgDispatcher}, &rplyCDRs); err != nil {
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agReq.CGRReply.Set(utils.PathItems{{Field: utils.Error}}, utils.NewNMData(err.Error()))
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}
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}
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if err := agReq.SetFields(reqProcessor.ReplyFields); err != nil {
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return false, err
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}
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if reqProcessor.Flags.HasKey(utils.MetaLog) {
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utils.Logger.Info(
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fmt.Sprintf("<%s> LOG, reply: %s",
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utils.DNSAgent, agReq.Reply))
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}
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if reqType == utils.MetaDryRun {
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utils.Logger.Info(
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fmt.Sprintf("<%s> DRY_RUN, reply: %s",
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utils.DNSAgent, agReq.Reply))
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}
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return true, nil
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}
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// Shutdown stops the DNS server
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func (da *DNSAgent) Shutdown() error {
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return da.server.Shutdown()
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}
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