ns2 Network Simulator 2.29: PingAgent Class Reference

00080                      : Agent(PT_PING), seq(0), oneway(0)
00081 {
00082     bind("packetSize_", &size_);
00083 }

00327 {
00328     char wrk[256];
00329     int n;
00330     double curTime = (&Scheduler::instance() == NULL ? 0 : 
00331               Scheduler::instance().clock());
00332     
00333     sprintf(wrk, "a -t "TIME_FORMAT" -s %d -d %d -n %s",
00334         curTime, here_.addr_, dst_.addr_, name);
00335     n = strlen(wrk);
00336     wrk[n] = '\n';
00337     wrk[n+1] = 0;
00338     if (channel_)
00339         (void)Tcl_Write(channel_, wrk, n+1);
00340     // keep agent trace name
00341     if (traceName_ != NULL)
00342         delete[] traceName_;
00343     traceName_ = new char[strlen(name)+1];
00344     strcpy(traceName_, name);
00345 }

00099 { return here_.addr_; }

00529 {
00530         Packet* p = allocpkt();
00531 
00532     if (n > 0)
00533             p->allocdata(n);
00534 
00535     return(p);
00536 }

00518 {
00519     Packet* p = Packet::alloc();
00520     initpkt(p);
00521     return (p);
00522 }

00373 {
00374     app_ = app;
00375 }

00086 {
00087   if (argc == 2) {
00088     if (strcmp(argv[1], "send") == 0) {
00089       // Create a new packet
00090       Packet* pkt = allocpkt();
00091       // Access the Ping header for the new packet:
00092       hdr_ping* hdr = hdr_ping::access(pkt);
00093       // Set the 'ret' field to 0, so the receiving node
00094       // knows that it has to generate an echo packet
00095       hdr->ret = 0;
00096       hdr->seq = seq++;
00097       // Store the current time in the 'send_time' field
00098       hdr->send_time = Scheduler::instance().clock();
00099       // Send the packet
00100       send(pkt, 0);
00101       // return TCL_OK, so the calling function knows that
00102       // the command has been processed
00103       return (TCL_OK);
00104     
00105     }
00106     
00107     else if (strcmp(argv[1], "start-WL-brdcast") == 0) {
00108       Packet* pkt = allocpkt();
00109       
00110       hdr_ip* iph = HDR_IP(pkt);
00111       hdr_ping* ph = hdr_ping::access(pkt);
00112       
00113       iph->daddr() = IP_BROADCAST;
00114       iph->dport() = iph->sport();
00115       ph->ret = 0;
00116       send(pkt, (Handler*) 0);
00117       return (TCL_OK);
00118     }
00119 
00120     else if (strcmp(argv[1], "oneway") == 0) {
00121       oneway=1;
00122       return (TCL_OK);
00123     }
00124   }
00125   
00126   // If the command hasn't been processed by PingAgent()::command,
00127   // call the command() function for the base class
00128   return (Agent::command(argc, argv));
00129 }

00390 {
00391 /*
00392     dst_ = dst;
00393 */
00394 }

00101 { return dst_.addr_; }

00103 {
00104     if (!debug_)
00105         return;
00106     va_list ap;
00107     va_start(ap, fmt);
00108     vprintf(fmt, ap);
00109 }

00094 {
00095     if (delay_bind(varName, localName, "agent_addr_", (int*)&(here_.addr_), tracer)) return TCL_OK;
00096     if (delay_bind(varName, localName, "agent_port_", (int*)&(here_.port_), tracer)) return TCL_OK;
00097     if (delay_bind(varName, localName, "dst_addr_", (int*)&(dst_.addr_), tracer)) return TCL_OK;
00098     if (delay_bind(varName, localName, "dst_port_", (int*)&(dst_.port_), tracer)) return TCL_OK;
00099     if (delay_bind(varName, localName, "fid_", (int*)&fid_, tracer)) return TCL_OK;
00100     if (delay_bind(varName, localName, "prio_", (int*)&prio_, tracer)) return TCL_OK;
00101     if (delay_bind(varName, localName, "flags_", (int*)&flags_, tracer)) return TCL_OK;
00102     if (delay_bind(varName, localName, "ttl_", &defttl_, tracer)) return TCL_OK;
00103     if (delay_bind(varName, localName, "class_", (int*)&fid_, tracer)) return TCL_OK;
00104     return Connector::delay_bind_dispatch(varName, localName, tracer);
00105 }

00079 {
00080     delay_bind_init_one("agent_addr_");
00081     delay_bind_init_one("agent_port_");
00082     delay_bind_init_one("dst_addr_");
00083     delay_bind_init_one("dst_port_");
00084     delay_bind_init_one("fid_");
00085     delay_bind_init_one("prio_");
00086     delay_bind_init_one("flags_");
00087     delay_bind_init_one("ttl_");
00088     delay_bind_init_one("class_");
00089     Connector::delay_bind_init_all();
00090 }

00223 {
00224     char wrk[256];
00225 
00226     // XXX we don't know InstVar outside of Tcl! Is there any
00227     // tracedvars hidden in InstVar? If so, shall we have a tclclInt.h?
00228     TracedVar* var = tracedvar_;
00229     for ( ;  var != 0;  var = var->next_) 
00230         flushAVar(var);
00231 
00232     // we need to flush all var values to trace file, 
00233     // so nam can do backtracing
00234     sprintf(wrk, "a -t "TIME_FORMAT" -s %d -d %d -n %s -x",
00235         Scheduler::instance().clock(), here_.addr_,
00236         dst_.addr_, traceName_); 
00237     if (traceName_ != NULL)
00238         delete[] traceName_;
00239     traceName_ = NULL;
00240 }

00102 { return dst_.port_; }

00115 {
00116     if (drop_ != 0)
00117         drop_->recv(p, s);
00118     else
00119         Packet::free(p);
00120 }

00107 {
00108     if (drop_ != 0)
00109         drop_->recv(p);
00110     else
00111         Packet::free(p);
00112 }

00104 { return type_; }

00092 {
00093     recv((Packet*)e);
00094 }

00364 {
00365     if (app_)
00366         app_->resume();
00367 }

00457 {
00458     hdr_cmn* ch = hdr_cmn::access(p);
00459     ch->uid() = uidcnt_++;
00460     ch->ptype() = type_;
00461     ch->size() = size_;
00462     ch->timestamp() = Scheduler::instance().clock();
00463     ch->iface() = UNKN_IFACE.value(); // from packet.h (agent is local)
00464     ch->direction() = hdr_cmn::NONE;
00465 
00466     ch->error() = 0;    /* pkt not corrupt to start with */
00467 
00468     hdr_ip* iph = hdr_ip::access(p);
00469     iph->saddr() = here_.addr_;
00470     iph->sport() = here_.port_;
00471     iph->daddr() = dst_.addr_;
00472     iph->dport() = dst_.port_;
00473     
00474     //DEBUG
00475     //if (dst_ != -1)
00476     //  printf("pl break\n");
00477     
00478     iph->flowid() = fid_;
00479     iph->prio() = prio_;
00480     iph->ttl() = defttl_;
00481 
00482     hdr_flags* hf = hdr_flags::access(p);
00483     hf->ecn_capable_ = 0;
00484     hf->ecn_ = 0;
00485     hf->eln_ = 0;
00486     hf->ecn_to_echo_ = 0;
00487     hf->fs_ = 0;
00488     hf->no_ts_ = 0;
00489     hf->pri_ = 0;
00490     hf->cong_action_ = 0;
00491     hf->qs_ = 0;
00492 #ifdef HAVE_STL
00493 
00494     hdr_nv* nv = hdr_nv::access(p);
00495     if (0)
00496         printf("Off hdr_nv %d, ip_hdr %d myaddr %d\n",
00497                hdr_nv::offset(), hdr_ip::offset(), here_.addr_);
00498     NixNode* pNixNode = NixNode::GetNodeObject(here_.addr_);
00499     if (0)
00500         printf("Node Object %p\n", pNixNode);
00501     if (pNixNode) { 
00502         // If we get non-null, indicates nixvector routing in use
00503         // Delete any left over nv in the packet
00504         // Get a nixvector to the target (may create new)
00505         NixVec* pNv = pNixNode->GetNixVector(dst_.addr_);
00506         pNv->Reset();
00507         nv->nv() = pNv; // And set the nixvec in the packet
00508         nv->h_used = 0; // And reset used portion to 0
00509     }
00510 #endif //HAVE_STL
00511 }

00251 {
00252     OldValue *p = new OldValue;
00253     assert(p != NULL);
00254     strncpy(p->val_, value, min(strlen(value)+1, TRACEVAR_MAXVALUELENGTH));
00255     p->var_ = v;
00256     p->next_ = NULL;
00257     if (oldValueList_ == NULL) 
00258         oldValueList_ = p;
00259     else {
00260         p->next_ = oldValueList_;
00261         oldValueList_ = p;
00262     }
00263 }

00061 { return debug_; }

00243 {
00244     OldValue *p = oldValueList_;
00245     while ((p != NULL) && (p->var_ != v))
00246         p = p->next_;
00247     return p;
00248 }

00311 {
00312     char wrk[256];
00313     int n;
00314     double curTime = (&Scheduler::instance() == NULL ? 0 : 
00315               Scheduler::instance().clock());
00316     
00317     sprintf(wrk, "v -t "TIME_FORMAT" -e monitor_agent %d %s",
00318         curTime, here_.addr_, traceName_);
00319     n = strlen(wrk);
00320     wrk[n] = '\n';
00321     wrk[n+1] = 0;
00322     if (channel_)
00323         (void)Tcl_Write(channel_, wrk, n+1);
00324 }

00100 { return here_.port_; }

00097 {
00098     Packet::free(p);
00099 }

00133 {
00134   // Access the IP header for the received packet:
00135   hdr_ip* hdrip = hdr_ip::access(pkt);
00136   
00137   // Access the Ping header for the received packet:
00138   hdr_ping* hdr = hdr_ping::access(pkt);
00139   
00140 
00141   // check if in brdcast mode
00142   if ((u_int32_t)hdrip->daddr() == IP_BROADCAST) {
00143     if (hdr->ret == 0) {
00144       
00145       printf("Recv BRDCAST Ping REQ : at %d.%d from %d.%d\n", here_.addr_, here_.port_, hdrip->saddr(), hdrip->sport());
00146       Packet::free(pkt);
00147       
00148       // create reply
00149       Packet* pktret = allocpkt();
00150 
00151       hdr_ping* hdrret = hdr_ping::access(pktret);
00152       hdr_ip* ipret = hdr_ip::access(pktret);
00153       
00154       hdrret->ret = 1;
00155       
00156       // add brdcast address
00157       ipret->daddr() = IP_BROADCAST;
00158       ipret->dport() = ipret->sport();
00159 
00160       send(pktret, 0);
00161     
00162     } else {
00163       printf("Recv BRDCAST Ping REPLY : at %d.%d from %d.%d\n", here_.addr_, here_.port_, hdrip->saddr(), hdrip->sport());
00164       Packet::free(pkt);
00165     }
00166     return;
00167   }
00168   // Is the 'ret' field = 0 (i.e. the receiving node is being pinged)?
00169   if (hdr->ret == 0) {
00170     // Send an 'echo'. First save the old packet's send_time
00171     double stime = hdr->send_time;
00172     int rcv_seq = hdr->seq;
00173     // Discard the packet
00174     Packet::free(pkt);
00175     // Create a new packet
00176     Packet* pktret = allocpkt();
00177     // Access the Ping header for the new packet:
00178     hdr_ping* hdrret = hdr_ping::access(pktret);
00179     // Set the 'ret' field to 1, so the receiver won't send
00180     // another echo
00181     hdrret->ret = 1;
00182     // Set the send_time field to the correct value
00183     hdrret->send_time = stime;
00184     // Added by Andrei Gurtov for one-way delay measurement.
00185     hdrret->rcv_time = Scheduler::instance().clock();
00186     hdrret->seq = rcv_seq;
00187     // Send the packet
00188     send(pktret, 0);
00189   } else {
00190     // A packet was received. Use tcl.eval to call the Tcl
00191     // interpreter with the ping results.
00192     // Note: In the Tcl code, a procedure
00193     // 'Agent/Ping recv {from rtt}' has to be defined which
00194     // allows the user to react to the ping result.
00195     char out[100];
00196     // Prepare the output to the Tcl interpreter. Calculate the
00197     // round trip time
00198     if (oneway) //AG
00199         sprintf(out, "%s recv %d %d %3.1f %3.1f", name(), 
00200         hdrip->src_.addr_ >> Address::instance().NodeShift_[1],
00201         hdr->seq, (hdr->rcv_time - hdr->send_time) * 1000,
00202         (Scheduler::instance().clock()-hdr->rcv_time) * 1000);
00203     else sprintf(out, "%s recv %d %3.1f", name(), 
00204         hdrip->src_.addr_ >> Address::instance().NodeShift_[1],
00205         (Scheduler::instance().clock()-hdr->send_time) * 1000);
00206     Tcl& tcl = Tcl::instance();
00207     tcl.eval(out);
00208     // Discard the packet
00209     Packet::free(pkt);
00210   }
00211 }

00355 {
00356     if (app_)
00357         app_->recv(nbytes); 
00358 }

00091 { sendmsg(nbytes); }

00084 { sendmsg(sz, data, 0); }

00080 { target_->recv(p, h); }

00401 {
00402     fprintf(stderr, 
00403     "Agent::sendmsg(int, AppData*, const char*) not implemented\n");
00404     abort();
00405 }

00413 {
00414     fprintf(stderr, 
00415     "Agent::sendmsg(int, AppData*, const char*) not implemented\n");
00416     abort();
00417 }

00103 { type_ = pkttype; }

00051 {drop_ = dt; }

00098 { return size_; }

00049 { target_ = target; }

00048 { return target_; }

00267 {
00268     if (channel_ == 0)
00269         return;
00270     char wrk[256], value[128];
00271     int n;
00272 
00273     // XXX we need to keep track of old values. What's the best way?
00274     v->value(value, 128);
00275 
00276     // XXX hack: how do I know ns has not started yet?
00277     // if there's nothing in value, return
00278     static int started = 0;
00279     if (!started) {
00280         Tcl::instance().evalc("[Simulator instance] is-started");
00281         if (Tcl::instance().result()[0] == '0')
00282             // Simulator not started, do nothing
00283             return;
00284         // remember for next time (so we don't always have to call to tcl)
00285         started = 1;
00286     };
00287 
00288     OldValue *ov = lookupOldValue(v);
00289     if (ov != NULL) {
00290         sprintf(wrk, 
00291             "f -t "TIME_FORMAT" -s %d -d %d -n %s -a %s -v %s -o %s -T v",
00292             Scheduler::instance().clock(), here_.addr_,
00293             dst_.addr_, v->name(), traceName_, value, ov->val_);
00294         strncpy(ov->val_, 
00295             value,
00296             min(strlen(value)+1, TRACEVAR_MAXVALUELENGTH));
00297     } else {
00298         // if there is value, insert it into old value list
00299         sprintf(wrk, "f -t "TIME_FORMAT" -s %d -d %d -n %s -a %s -v %s -T v",
00300             Scheduler::instance().clock(), here_.addr_,
00301             dst_.addr_, v->name(), traceName_, value);
00302         insertOldValue(v, value);
00303     }
00304     n = strlen(wrk);
00305     wrk[n] = '\n';
00306     wrk[n+1] = 0;
00307     (void)Tcl_Write(channel_, wrk, n+1);
00308 }


Public Member Functions
nsaddr_t &	addr ()
virtual void	attachApp (Application *app)
virtual void	close ()
int	command (int argc, const char const argv)
virtual int	command (int argc, const char const argv)
virtual void	connect (nsaddr_t dst)
nsaddr_t &	daddr ()
virtual void	debug (const char *fmt,...)
nsaddr_t &	dport ()
virtual void	drop (Packet *p)
packet_t	get_pkttype ()
int	isdebug () const
virtual void	listen ()
	PingAgent ()
	PingAgent ()
nsaddr_t &	port ()
virtual void	recv (Packet p, const char s)
void	recv (Packet , Handler )
virtual void	recv (Packet , Handler )
void	recvOnly (Packet *)
virtual void	send (int nbytes)
virtual void	send (int sz, AppData *data)
void	send (Packet p, Handler h)
virtual void	sendmsg (int nbytes, const char *flags=0)
virtual void	sendmsg (int sz, AppData , const char flags=0)
virtual void	sendto (int nbytes, const char *flags, ns_addr_t dst)
virtual void	sendto (int nbytes, const char *flags, nsaddr_t dst)
virtual void	sendto (int sz, AppData , const char flags, ns_addr_t dst)
virtual void	sendto (int sz, AppData , const char flags, nsaddr_t dst)
void	set_pkttype (packet_t pkttype)
void	setDropTarget (NsObject *dt)
virtual int &	size ()
void	target (NsObject *target)
NsObject *	target ()
virtual void	timeout (int tno)
Data Fields
int	oneway
int	seq
Protected Member Functions
void	addAgentTrace (const char *name)
Packet *	allocpkt (int) const
Packet *	allocpkt () const
virtual int	delay_bind_dispatch (const char varName, const char localName, TclObject *tracer)
virtual void	delay_bind_init_all ()
void	deleteAgentTrace ()
virtual void	drop (Packet p, const char s)
void	dumpTracedVars ()
void	handle (Event *)
virtual void	idle ()
void	initpkt (Packet *) const
void	insertOldValue (TracedVar v, const char value)
OldValue *	lookupOldValue (TracedVar *v)
void	monitorAgentTrace ()
virtual void	recvBytes (int bytes)
virtual void	reset ()
virtual void	trace (TracedVar *v)
virtual void	trace_event (char *eventtype)
Protected Attributes
Application *	app_
Tcl_Channel	channel_
int	debug_
int	defttl_
NsObject *	drop_
ns_addr_t	dst_
EventTrace *	et_
int	fid_
int	flags_
ns_addr_t	here_
int	off_ping_
OldValue *	oldValueList_
int	prio_
int	size_
NsObject *	target_
char *	traceName_
packet_t	type_
Static Protected Attributes
static int	uidcnt_

PingAgent Class Reference

Detailed Description

Public Member Functions

Data Fields

Protected Member Functions

Protected Attributes

Static Protected Attributes

Constructor & Destructor Documentation

Member Function Documentation

Field Documentation