ns2 Network Simulator 2.29: PingResponder Class Reference

00060 : Agent(PT_LIVE) { }

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 }

00121 {
00122     Tcl& tcl = Tcl::instance();
00123     if (argc == 2) {
00124         if (strcmp(argv[1], "delete-agent-trace") == 0) {
00125             if ((traceName_ == 0) || (channel_ == 0))
00126                 return (TCL_OK);
00127             deleteAgentTrace();
00128             return (TCL_OK);
00129         } else if (strcmp(argv[1], "show-monitor") == 0) {
00130             if ((traceName_ == 0) || (channel_ == 0))
00131                 return (TCL_OK);
00132             monitorAgentTrace();
00133             return (TCL_OK);
00134         } else if (strcmp(argv[1], "close") == 0) {
00135             close();
00136             return (TCL_OK);
00137         } else if (strcmp(argv[1], "listen") == 0) {
00138                         listen();
00139                         return (TCL_OK);
00140                 } else if (strcmp(argv[1], "dump-namtracedvars") == 0) {
00141             enum_tracedVars();
00142             return (TCL_OK);
00143         }
00144         
00145     }
00146     else if (argc == 3) {
00147         if (strcmp(argv[1], "attach") == 0) {
00148             int mode;
00149             const char* id = argv[2];
00150             channel_ = Tcl_GetChannel(tcl.interp(), (char*)id, &mode);
00151             if (channel_ == 0) {
00152                 tcl.resultf("trace: can't attach %s for writing", id);
00153                 return (TCL_ERROR);
00154             }
00155             return (TCL_OK);
00156         } else if (strcmp(argv[1], "add-agent-trace") == 0) {
00157             // we need to write nam traces and set agent trace name
00158             if (channel_ == 0) {
00159                 tcl.resultf("agent %s: no trace file attached", name_);
00160                 return (TCL_OK);
00161             }
00162             addAgentTrace(argv[2]);
00163             return (TCL_OK);
00164         } else if (strcmp(argv[1], "connect") == 0) {
00165             connect((nsaddr_t)atoi(argv[2]));
00166             return (TCL_OK);
00167         } else if (strcmp(argv[1], "send") == 0) {
00168             sendmsg(atoi(argv[2]));
00169             return (TCL_OK);
00170         } else if (strcmp(argv[1], "set_pkttype") == 0) {
00171             set_pkttype(packet_t(atoi(argv[2])));
00172             return (TCL_OK);
00173         }
00174     }
00175     else if (argc == 4) {   
00176         if (strcmp(argv[1], "sendmsg") == 0) {
00177             sendmsg(atoi(argv[2]), argv[3]);
00178             return (TCL_OK);
00179         }
00180     }
00181     else if (argc == 5) {
00182         if (strcmp(argv[1], "sendto") == 0) {
00183             sendto(atoi(argv[2]), argv[3], (nsaddr_t)atoi(argv[4]));
00184             return (TCL_OK);
00185         }
00186     }
00187     if (strcmp(argv[1], "tracevar") == 0) {
00188         // wrapper of TclObject's trace command, because some tcl
00189         // agents (e.g. srm) uses it.
00190         const char* args[4];
00191         char tmp[6];
00192         strcpy(tmp, "trace");
00193         args[0] = argv[0];
00194         args[1] = tmp;
00195         args[2] = argv[2];
00196         if (argc > 3)
00197             args[3] = argv[3];
00198         return (Connector::command(argc, args));
00199     }
00200     return (Connector::command(argc, argv));
00201 }

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 }

00083 {
00084     hdr_cmn *ch = HDR_CMN(pkt);
00085     int psize = ch->size();
00086     u_char* payload = pkt->accessdata();
00087 
00088     if (payload == NULL) {
00089         fprintf(stderr, "%f: PingResponder(%s): recv NULL data area\n",
00090             Scheduler::instance().clock(), name());
00091         Packet::free(pkt);
00092         return;
00093     }
00094 
00095     /*
00096      * assume here that the data area contains an IP header!
00097      */
00098 
00099     icmp* icmph;
00100     if ((icmph = validate(psize, (ip*) payload)) == NULL) {
00101         Internet::print_ip((ip*) payload);
00102         Packet::free(pkt);
00103         return;
00104     }
00105 
00106 
00107     /*
00108      * tasks: change icmp type to echo-reply, recompute IP hdr cksum,
00109      * recompute ICMP cksum
00110      */
00111 
00112     icmph->icmp_type = ICMP_ECHOREPLY;
00113     reflect((ip*) payload);     // like kernel routine icmp_reflect()
00114 
00115     /*
00116      * set up simulator packet to go to the correct place
00117      */
00118 
00119     Agent::initpkt(pkt);
00120     ch->size() = psize; // will have been overwrittin by initpkt
00121 
00122     target_->recv(pkt);
00123     return;
00124 }

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

00232 {
00233     in_addr daddr = iph->ip_dst;
00234     int iplen = ntohs(iph->ip_len);
00235     int iphlen = (*((char*)iph) & 0x0f) << 2;
00236 
00237     /* swap src and dest IP addresses on IP header */
00238     iph->ip_dst = iph->ip_src;
00239     iph->ip_src = daddr;
00240     iph->ip_sum = 0;
00241     iph->ip_sum = Internet::in_cksum((u_short*) iph, iphlen);
00242 
00243     /* recompute the icmp cksum */
00244     icmp* icp = (icmp*)(iph + 1);   // just past standard IP header
00245     icp->icmp_cksum = 0;
00246     icp->icmp_cksum = Internet::in_cksum((u_short*)icp, iplen - iphlen);
00247 }

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 }

00134 {
00135     if (sz < 20) {
00136         fprintf(stderr, "%f: PingResponder(%s): sim pkt too small for base IP header(%d)\n",
00137             Scheduler::instance().clock(), name(), sz);
00138         return (NULL);
00139     }
00140 
00141     int ipver = (*((char*)iph) & 0xf0) >> 4;
00142     if (ipver != 4) {
00143         fprintf(stderr, "%f: PingResponder(%s): IP bad ver (%d)\n",
00144             Scheduler::instance().clock(), name(), ipver);
00145         return (NULL);
00146     }
00147 
00148     int iplen = ntohs(iph->ip_len);
00149     int iphlen = (*((char*)iph) & 0x0f) << 2;
00150     if (iplen < (iphlen + 8)) {
00151         fprintf(stderr, "%f: PingResponder(%s): IP dgram not long enough (len: %d)\n",
00152             Scheduler::instance().clock(), name(), iplen);
00153         return (NULL);
00154     }
00155 
00156     if (sz < iplen) {
00157         fprintf(stderr, "%f: PingResponder(%s): IP dgram not long enough (len: %d)\n",
00158             Scheduler::instance().clock(), name(), iplen);
00159         return (NULL);
00160     }
00161 
00162     if (iphlen != 20) {
00163         fprintf(stderr, "%f: PingResponder(%s): IP bad hlen (%d)\n",
00164             Scheduler::instance().clock(), name(), iphlen);
00165         return (NULL);
00166     }
00167 
00168     if (Internet::in_cksum((u_short*) iph, iphlen)) {
00169         fprintf(stderr, "%f: PingResponder(%s): IP bad cksum\n",
00170             Scheduler::instance().clock(), name());
00171         return (NULL);
00172     }
00173 
00174     if (iph->ip_p != IPPROTO_ICMP) {
00175         fprintf(stderr, "%f: PingResponder(%s): not ICMP (proto: %d)\n",
00176             Scheduler::instance().clock(), name(), iph->ip_p);
00177         return (NULL);
00178     }
00179 
00180 
00181     if (iph->ip_off != 0) {
00182         fprintf(stderr, "%f: PingResponder(%s): fragment! (off: 0x%x)\n",
00183             Scheduler::instance().clock(), name(), ntohs(iph->ip_off));
00184         return (NULL);
00185     }
00186 
00187     if (iph->ip_src.s_addr == 0xffffffff || iph->ip_src.s_addr == 0) {
00188         fprintf(stderr, "%f: PingResponder(%s): bad src addr (%s)\n",
00189             Scheduler::instance().clock(), name(),
00190             inet_ntoa(iph->ip_src));
00191         return (NULL);
00192     }
00193 
00194     if (IN_MULTICAST(ntohl(iph->ip_src.s_addr))) {
00195         fprintf(stderr, "%f: PingResponder(%s): mcast src addr (%s)\n",
00196             Scheduler::instance().clock(), name(),
00197             inet_ntoa(iph->ip_src));
00198         return (NULL);
00199     }
00200     icmp* icp = (icmp*) (iph + 1);
00201     if (Internet::in_cksum((u_short*) icp, iplen - iphlen) != 0) {
00202         fprintf(stderr,
00203             "%f: PingResponder(%s): bad ICMP cksum\n",
00204             Scheduler::instance().clock(), name());
00205         return (NULL);
00206     }
00207     if (icp->icmp_type != ICMP_ECHO) {
00208         fprintf(stderr, "%f: PingResponder(%s): not echo request (%d)\n",
00209             Scheduler::instance().clock(), name(),
00210             icp->icmp_type);
00211         return (NULL);
00212     }
00213 
00214     if (icp->icmp_code != 0) {
00215         fprintf(stderr, "%f: PingResponder(%s): bad code (%d)\n",
00216             Scheduler::instance().clock(), name(),
00217             icp->icmp_code);
00218         return (NULL);
00219     }
00220     return (icp);
00221 }


Public Member Functions
nsaddr_t &	addr ()
virtual void	attachApp (Application *app)
virtual void	close ()
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 ()
	PingResponder ()
nsaddr_t &	port ()
virtual void	recv (Packet p, const char s)
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)
Protected Member Functions
void	addAgentTrace (const char *name)
Packet *	allocpkt (int) const
Packet *	allocpkt () const
int	command (int argc, const char const argv)
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)
void	reflect (ip *)
virtual void	reset ()
virtual void	trace (TracedVar *v)
virtual void	trace_event (char *eventtype)
icmp *	validate (int, ip *)
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_
OldValue *	oldValueList_
int	prio_
int	size_
NsObject *	target_
char *	traceName_
packet_t	type_
Static Protected Attributes
static int	uidcnt_

PingResponder Class Reference

Detailed Description

Public Member Functions

Protected Member Functions

Protected Attributes

Static Protected Attributes

Constructor & Destructor Documentation

Member Function Documentation

Field Documentation