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| /* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /cvsroot/nsnam/ns-2/common/agent.cc,v 1.79 2006/02/21 15:20:17 mahrenho Exp $ (LBL)";
#endif
#include <assert.h>
#include <stdlib.h>
#include "config.h"
#include "agent.h"
#include "ip.h"
#include "flags.h"
#include "address.h"
#include "app.h"
#ifdef HAVE_STL
#include "nix/hdr_nv.h"
#include "nix/nixnode.h"
#endif //HAVE_STL
#ifndef min
#define min(a, b) (((a) < (b)) ? (a) : (b))
#endif
static class AgentClass : public TclClass {
public:
AgentClass() : TclClass("Agent") {}
TclObject* create(int, const char*const*) {
return (new Agent(PT_NTYPE));
}
} class_agent;
int Agent::uidcnt_; /* running unique id */
Agent::Agent(packet_t pkttype) :
size_(0), type_(pkttype),
channel_(0), traceName_(NULL),
oldValueList_(NULL), app_(0), et_(0)
{
}
void
Agent::delay_bind_init_all()
{
delay_bind_init_one("agent_addr_");
delay_bind_init_one("agent_port_");
delay_bind_init_one("dst_addr_");
delay_bind_init_one("dst_port_");
delay_bind_init_one("fid_");
delay_bind_init_one("prio_");
delay_bind_init_one("flags_");
delay_bind_init_one("ttl_");
delay_bind_init_one("class_");
Connector::delay_bind_init_all();
}
int
Agent::delay_bind_dispatch(const char *varName, const char *localName, TclObject *tracer)
{
if (delay_bind(varName, localName, "agent_addr_", (int*)&(here_.addr_), tracer)) return TCL_OK;
if (delay_bind(varName, localName, "agent_port_", (int*)&(here_.port_), tracer)) return TCL_OK;
if (delay_bind(varName, localName, "dst_addr_", (int*)&(dst_.addr_), tracer)) return TCL_OK;
if (delay_bind(varName, localName, "dst_port_", (int*)&(dst_.port_), tracer)) return TCL_OK;
if (delay_bind(varName, localName, "fid_", (int*)&fid_, tracer)) return TCL_OK;
if (delay_bind(varName, localName, "prio_", (int*)&prio_, tracer)) return TCL_OK;
if (delay_bind(varName, localName, "flags_", (int*)&flags_, tracer)) return TCL_OK;
if (delay_bind(varName, localName, "ttl_", &defttl_, tracer)) return TCL_OK;
if (delay_bind(varName, localName, "class_", (int*)&fid_, tracer)) return TCL_OK;
return Connector::delay_bind_dispatch(varName, localName, tracer);
}
Agent::~Agent()
{
if (oldValueList_ != NULL) {
OldValue *p = oldValueList_;
while (oldValueList_ != NULL) {
oldValueList_ = oldValueList_->next_;
delete p;
p = oldValueList_;
}
}
}
int Agent::command(int argc, const char*const* argv)
{
Tcl& tcl = Tcl::instance();
if (argc == 2) {
if (strcmp(argv[1], "delete-agent-trace") == 0) {
if ((traceName_ == 0) || (channel_ == 0))
return (TCL_OK);
deleteAgentTrace();
return (TCL_OK);
} else if (strcmp(argv[1], "show-monitor") == 0) {
if ((traceName_ == 0) || (channel_ == 0))
return (TCL_OK);
monitorAgentTrace();
return (TCL_OK);
} else if (strcmp(argv[1], "close") == 0) {
close();
return (TCL_OK);
} else if (strcmp(argv[1], "listen") == 0) {
listen();
return (TCL_OK);
} else if (strcmp(argv[1], "dump-namtracedvars") == 0) {
enum_tracedVars();
return (TCL_OK);
}
}
else if (argc == 3) {
if (strcmp(argv[1], "attach") == 0) {
int mode;
const char* id = argv[2];
channel_ = Tcl_GetChannel(tcl.interp(), (char*)id, &mode);
if (channel_ == 0) {
tcl.resultf("trace: can't attach %s for writing", id);
return (TCL_ERROR);
}
return (TCL_OK);
} else if (strcmp(argv[1], "add-agent-trace") == 0) {
// we need to write nam traces and set agent trace name
if (channel_ == 0) {
tcl.resultf("agent %s: no trace file attached", name_);
return (TCL_OK);
}
addAgentTrace(argv[2]);
return (TCL_OK);
} else if (strcmp(argv[1], "connect") == 0) {
connect((nsaddr_t)atoi(argv[2]));
return (TCL_OK);
} else if (strcmp(argv[1], "send") == 0) {
sendmsg(atoi(argv[2]));
return (TCL_OK);
} else if (strcmp(argv[1], "set_pkttype") == 0) {
set_pkttype(packet_t(atoi(argv[2])));
return (TCL_OK);
}
}
else if (argc == 4) {
if (strcmp(argv[1], "sendmsg") == 0) {
sendmsg(atoi(argv[2]), argv[3]);
return (TCL_OK);
}
}
else if (argc == 5) {
if (strcmp(argv[1], "sendto") == 0) {
sendto(atoi(argv[2]), argv[3], (nsaddr_t)atoi(argv[4]));
return (TCL_OK);
}
}
if (strcmp(argv[1], "tracevar") == 0) {
// wrapper of TclObject's trace command, because some tcl
// agents (e.g. srm) uses it.
const char* args[4];
char tmp[6];
strcpy(tmp, "trace");
args[0] = argv[0];
args[1] = tmp;
args[2] = argv[2];
if (argc > 3)
args[3] = argv[3];
return (Connector::command(argc, args));
}
return (Connector::command(argc, argv));
}
void Agent::flushAVar(TracedVar *v)
{
char wrk[256], value[128];
int n;
// XXX we need to keep track of old values. What's the best way?
v->value(value, 128);
if (strcmp(value, "") == 0)
// no value, because no writes has occurred to this var
return;
sprintf(wrk, "f -t "TIME_FORMAT" -s %d -d %d -n %s -a %s -o %s -T v -x",
Scheduler::instance().clock(), addr(), dst_.addr_,
v->name(), traceName_, value);
n = strlen(wrk);
wrk[n] = '\n';
wrk[n+1] = 0;
(void)Tcl_Write(channel_, wrk, n+1);
}
void Agent::deleteAgentTrace()
{
char wrk[256];
// XXX we don't know InstVar outside of Tcl! Is there any
// tracedvars hidden in InstVar? If so, shall we have a tclclInt.h?
TracedVar* var = tracedvar_;
for ( ; var != 0; var = var->next_)
flushAVar(var);
// we need to flush all var values to trace file,
// so nam can do backtracing
sprintf(wrk, "a -t "TIME_FORMAT" -s %d -d %d -n %s -x",
Scheduler::instance().clock(), here_.addr_,
dst_.addr_, traceName_);
if (traceName_ != NULL)
delete[] traceName_;
traceName_ = NULL;
}
OldValue* Agent::lookupOldValue(TracedVar *v)
{
OldValue *p = oldValueList_;
while ((p != NULL) && (p->var_ != v))
p = p->next_;
return p;
}
void Agent::insertOldValue(TracedVar *v, const char *value)
{
OldValue *p = new OldValue;
assert(p != NULL);
strncpy(p->val_, value, min(strlen(value)+1, TRACEVAR_MAXVALUELENGTH));
p->var_ = v;
p->next_ = NULL;
if (oldValueList_ == NULL)
oldValueList_ = p;
else {
p->next_ = oldValueList_;
oldValueList_ = p;
}
}
// callback from traced variable updates
void Agent::trace(TracedVar* v)
{
if (channel_ == 0)
return;
char wrk[256], value[128];
int n;
// XXX we need to keep track of old values. What's the best way?
v->value(value, 128);
// XXX hack: how do I know ns has not started yet?
// if there's nothing in value, return
static int started = 0;
if (!started) {
Tcl::instance().evalc("[Simulator instance] is-started");
if (Tcl::instance().result()[0] == '0')
// Simulator not started, do nothing
return;
// remember for next time (so we don't always have to call to tcl)
started = 1;
};
OldValue *ov = lookupOldValue(v);
if (ov != NULL) {
sprintf(wrk,
"f -t "TIME_FORMAT" -s %d -d %d -n %s -a %s -v %s -o %s -T v",
Scheduler::instance().clock(), here_.addr_,
dst_.addr_, v->name(), traceName_, value, ov->val_);
strncpy(ov->val_,
value,
min(strlen(value)+1, TRACEVAR_MAXVALUELENGTH));
} else {
// if there is value, insert it into old value list
sprintf(wrk, "f -t "TIME_FORMAT" -s %d -d %d -n %s -a %s -v %s -T v",
Scheduler::instance().clock(), here_.addr_,
dst_.addr_, v->name(), traceName_, value);
insertOldValue(v, value);
}
n = strlen(wrk);
wrk[n] = '\n';
wrk[n+1] = 0;
(void)Tcl_Write(channel_, wrk, n+1);
}
void Agent::monitorAgentTrace()
{
char wrk[256];
int n;
double curTime = (&Scheduler::instance() == NULL ? 0 :
Scheduler::instance().clock());
sprintf(wrk, "v -t "TIME_FORMAT" -e monitor_agent %d %s",
curTime, here_.addr_, traceName_);
n = strlen(wrk);
wrk[n] = '\n';
wrk[n+1] = 0;
if (channel_)
(void)Tcl_Write(channel_, wrk, n+1);
}
void Agent::addAgentTrace(const char *name)
{
char wrk[256];
int n;
double curTime = (&Scheduler::instance() == NULL ? 0 :
Scheduler::instance().clock());
sprintf(wrk, "a -t "TIME_FORMAT" -s %d -d %d -n %s",
curTime, here_.addr_, dst_.addr_, name);
n = strlen(wrk);
wrk[n] = '\n';
wrk[n+1] = 0;
if (channel_)
(void)Tcl_Write(channel_, wrk, n+1);
// keep agent trace name
if (traceName_ != NULL)
delete[] traceName_;
traceName_ = new char[strlen(name)+1];
strcpy(traceName_, name);
}
void Agent::timeout(int)
{
}
/*
* Callback to application to notify the reception of a number of bytes
*/
void Agent::recvBytes(int nbytes)
{
if (app_)
app_->recv(nbytes);
}
/*
* Callback to application to notify the termination of a connection
*/
void Agent::idle()
{
if (app_)
app_->resume();
}
/*
* Assign application pointer for callback purposes
*/
void Agent::attachApp(Application *app)
{
app_ = app;
}
void Agent::close()
{
}
void Agent::listen()
{
}
/*
* This function is a placeholder in case applications want to dynamically
* connect to agents (presently, must be done at configuration time).
*/
void Agent::connect(nsaddr_t /*dst*/)
{
/*
dst_ = dst;
*/
}
/*
* Place holders for sending application data
*/
void Agent::sendmsg(int /*sz*/, AppData* /*data*/, const char* /*flags*/)
{
fprintf(stderr,
"Agent::sendmsg(int, AppData*, const char*) not implemented\n");
abort();
}
void Agent::sendmsg(int /*nbytes*/, const char* /*flags*/)
{
}
void Agent::sendto(int /*sz*/, AppData* /*data*/, const char* /*flags*/,
nsaddr_t /*dst*/)
{
fprintf(stderr,
"Agent::sendmsg(int, AppData*, const char*) not implemented\n");
abort();
}
// to support application using message passing
void Agent::sendto(int /*sz*/, AppData* /*data*/, const char* /*flags*/,
ns_addr_t /*dst*/)
{
}
/*
* This function is a placeholder in case applications want to dynamically
* connect to agents (presently, must be done at configuration time).
*/
void Agent::sendto(int /*nbytes*/, const char /*flags*/[], nsaddr_t /*dst*/)
{
/*
dst_ = dst;
sendmsg(nbytes, flags);
*/
}
// to support application using message passing
void Agent::sendto(int /*nbytes*/, const char /*flags*/[], ns_addr_t /*dst*/)
{
}
void Agent::recv(Packet* p, Handler*)
{
if (app_)
app_->recv(hdr_cmn::access(p)->size());
/*
* didn't expect packet (or we're a null agent?)
*/
Packet::free(p);
}
/*
* initpkt: fill in all the generic fields of a pkt
*/
void
Agent::initpkt(Packet* p) const
{
hdr_cmn* ch = hdr_cmn::access(p);
ch->uid() = uidcnt_++;
ch->ptype() = type_;
ch->size() = size_;
ch->timestamp() = Scheduler::instance().clock();
ch->iface() = UNKN_IFACE.value(); // from packet.h (agent is local)
ch->direction() = hdr_cmn::NONE;
ch->error() = 0; /* pkt not corrupt to start with */
hdr_ip* iph = hdr_ip::access(p);
iph->saddr() = here_.addr_;
iph->sport() = here_.port_;
iph->daddr() = dst_.addr_;
iph->dport() = dst_.port_;
//DEBUG
//if (dst_ != -1)
// printf("pl break\n");
iph->flowid() = fid_;
iph->prio() = prio_;
iph->ttl() = defttl_;
hdr_flags* hf = hdr_flags::access(p);
hf->ecn_capable_ = 0;
hf->ecn_ = 0;
hf->eln_ = 0;
hf->ecn_to_echo_ = 0;
hf->fs_ = 0;
hf->no_ts_ = 0;
hf->pri_ = 0;
hf->cong_action_ = 0;
hf->qs_ = 0;
#ifdef HAVE_STL
hdr_nv* nv = hdr_nv::access(p);
if (0)
printf("Off hdr_nv %d, ip_hdr %d myaddr %d\n",
hdr_nv::offset(), hdr_ip::offset(), here_.addr_);
NixNode* pNixNode = NixNode::GetNodeObject(here_.addr_);
// if (0)
// printf("Node Object %p\n", reinterpret_cast<void *>(pNixNode) );
if (pNixNode) {
// If we get non-null, indicates nixvector routing in use
// Delete any left over nv in the packet
// Get a nixvector to the target (may create new)
NixVec* pNv = pNixNode->GetNixVector(dst_.addr_);
pNv->Reset();
nv->nv() = pNv; // And set the nixvec in the packet
nv->h_used = 0; // And reset used portion to 0
}
#endif //HAVE_STL
}
/*
* allocate a packet and fill in all the generic fields
*/
Packet*
Agent::allocpkt() const
{
Packet* p = Packet::alloc();
initpkt(p);
return (p);
}
/* allocate a packet and fill in all the generic fields and allocate
* a buffer of n bytes for data
*/
Packet*
Agent::allocpkt(int n) const
{
Packet* p = allocpkt();
if (n > 0)
p->allocdata(n);
return(p);
} |
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