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routing.cpp
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routing.cpp
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//
// routing.cpp
//
#include "routing.h"
extern FILE *output;
/*****************
* base
*****************/
base::base(const char* pName, unsigned long myIP)
{
_myIP = myIP;
_pcomm = new commObject(ROUTER_INTERVAL);
_name = pName;
}
base::~base()
{
delete _pcomm;
}
unsigned long base::toPrefix(unsigned long ip)
{
struct in_addr ia;
#ifdef WIN32
ia.S_un.S_addr = ip;
#else
ia.s_addr = ip;
#endif
char *pDest = inet_ntoa (ia);
char *p = strrchr(pDest, '.');
*++p = '0';
*++p = '\0';
return inet_addr(pDest);
}
char* base::toIPString(unsigned long ip)
{
struct in_addr ia;
#ifdef WIN32
ia.S_un.S_addr = ip;
#else
ia.s_addr = ip;
#endif
return inet_ntoa (ia);
}
/*****************
* host
*****************/
host::host(const char* pName, unsigned long myIP, unsigned long myRouter)
: base(pName, myIP)
{
_router = myRouter;
}
void host::init(const char* coor, int coorPort)
{
_pcomm->init(coor, coorPort);
_outbuf[0] = MSGTYPE_REG;
unsigned long* lp = (unsigned long*)(&_outbuf[1]);
size_t sz = strlen(_name)+(3*sizeof(long))+strlen(pmyAS)+1;
*lp++ = sz;
*lp++ = ASid;
*lp++ = _myIP;
char* p = (char*) lp;
sprintf(p, "%s", _name);
_pcomm->tellGod(_outbuf, (sz+2));
}
void host::run()
{
printf("From %s: host::run called.\n",_name);
bool bRun = true;
size_t sz;
while (bRun)
{
if ((sz = _pcomm->readMsg(_inbuf, BUFF_SIZE)) > 0)
{
switch (_inbuf[0])
{
case MSGTYPE_CMSG:
sendMsg(&_inbuf[1], (sz-1));
break;
case MSGTYPE_HMSG:
recvMsg(&_inbuf[1], (sz-1));
break;
case MSGTYPE_CQUIT:
bRun = false;
break;
default:
printf("From %s: unknown message type %d. The message is dropped.\n",_name,_inbuf[0]);
}
}
}
}
void host::sendMsg(const char* pMsg, size_t msgSz)
{
unsigned long* ulp = (unsigned long*) pMsg;
_outbuf[0] = MSGTYPE_HMSG; // msg type
unsigned long* ulp1 = (unsigned long*)&_outbuf[1];
unsigned long dest = *ulp++; //dest
*ulp1++ = dest; //dest
*ulp1++ = _myIP;
*ulp1++ = 0;
memset(ulp1, 0, sizeof(unsigned long)*HOP_SIZE);
size_t sz = *ulp++;
if (msgSz >= (sz+sizeof(long)*2))
{
char *p = (char*) ulp;
*(p+sz) = '\0'; // make sure proper terminated
char *p1 = (char*) (ulp1+HOP_SIZE);
strcpy(p1, p);
_pcomm->sendMsg(_router, _outbuf, (sizeof(_header)+sz+2));
printf("From %s: send to 0x%x msg %s.\n",_name,dest,p);
}
else
printf("From %s: error - message from coordinator size mismatch, message dropped.\n",_name);
}
void host::recvMsg(const void* pMsg, size_t msgSz)
{
unsigned long* ulp = (unsigned long*) pMsg;
struct in_addr ia;
_header.destIP = *ulp++;
#ifdef WIN32
ia.S_un.S_addr = _header.destIP;
#else
ia.s_addr = _header.destIP;
#endif
char *pDest = inet_ntoa (ia);
#ifdef WIN32
ia.S_un.S_addr = *ulp++; // src
#else
ia.s_addr = *ulp++; // src
#endif
char *pSrc = inet_ntoa (ia);
#ifdef WIN32
ia.S_un.S_addr = _myIP;
#else
ia.s_addr = _myIP;
#endif
if (_header.destIP != _myIP)
{
printf("From %s: error - the message from %s is destinated for %s. My address is %s.\n"
, pSrc, pDest, inet_ntoa(ia));
fprintf(output,"From %s: error - the message from %s is destinated for %s. My address is %s.\n"
, pSrc, pDest, inet_ntoa(ia));
}
else
{
_header.length = *ulp++;
char* p = (char*) (ulp+HOP_SIZE);
printf("From %s: the message is from %s through %d routers:\n"
,_name, pSrc, _header.length);
fprintf(output,"From %s: the message is from %s through %d routers:\n"
,_name, pSrc, _header.length);
char rtr[20];
for (unsigned int i = 0; i < _header.length; i++)
{
#ifdef WIN32
ia.S_un.S_addr = *ulp++;
#else
ia.s_addr = *ulp++;
#endif
strcpy(rtr, inet_ntoa (ia));
if (i == 0)
{
printf(" **[hop %d, %s]", i, rtr);
fprintf(output," **[hop %d, %s]", i, rtr);
}
else
{
printf(" -> [hop %d, %s]", i, rtr);
fprintf(output," ->[hop %d, %s]", i, rtr);
}
}
printf(".\n ++ msg: %s.\n",p);
fprintf(output,".\n ++ msg: %s.\n",p);
}
fflush(output);
}
/*****************
* router
*****************/
router::router(const char* pName, unsigned long myIP)
: base(pName, myIP)
{
_myIP2 = 0xFFFFFFFF;
_cprop = 0;
}
void router::init(const char* coor, int coorPort)
{
_pcomm->init(coor, coorPort);
_outbuf[0] = MSGTYPE_REG;
unsigned long* lp = (unsigned long*)(&_outbuf[1]);
size_t sz = strlen(_name)+(3*sizeof(long))+strlen(pmyAS)+1;
*lp++ = sz;
*lp++ = ASid;
*lp++ = _myIP;
char* p = (char*) lp;
sprintf(p, "%s:%s", pmyAS, _name);
_pcomm->tellGod(_outbuf, (sz+2));
}
void router::addExtraIP(unsigned long ip)
{
_myIP2 = ip;
}
void router::setNbr(unsigned long nbr, long cost)
{
_nbr_table.insert(pa3Map::value_type(nbr, cost));
#ifdef _TRACE
printf("From %s: setNbr insert nbr %lu, cost %ld\n",_name, nbr,cost);
#endif
}
void router::run()
{
printf("From %s: router::run called.\n",_name);
pa3Map::iterator nt_it;
unsigned long nbrIPprf;
_dv_table.insert(pa3Map::value_type(toPrefix(_myIP), 0));
for (nt_it = _nbr_table.begin(); nt_it != _nbr_table.end(); nt_it++)
{
nbrIPprf = toPrefix((*nt_it).first);
/* if ((nbrIP.S_un.S_addr>>8) != (_myIP.S_un.S_addr>>8))// from other AS?
{
// nbrIP.S_un.S_addr != 0x80000000; this may not work
} */
_dv_table.insert(pa3Map::value_type(nbrIPprf, (*nt_it).second));
_fwd_table.insert(IFWMap::value_type(nbrIPprf, (*nt_it).first));
}
printf("initial DV..");
printDV();
printFT("run");
propaganda_DV();
bool bRun = true;
while (bRun)
{
size_t sz = _pcomm->readMsg(_inbuf, BUFF_SIZE);
if (sz == 0)
propaganda_DV();
else
{
switch (_inbuf[0])
{
case MSGTYPE_HMSG:
forwrdMsg(&_inbuf[1], sz);
break;
case MSGTYPE_RDV:
updateDV(&_inbuf[1], (sz-1));
break;
case MSGTYPE_CCHNG:
changeCost(&_inbuf[1], (sz-1));
break;
case MSGTYPE_CDN:
downLink(&_inbuf[1], (sz-1));
break;
case MSGTYPE_CASDN:
ASdownLink(&_inbuf[1], (sz-1));
break;
case MSGTYPE_CASUP:
ASupink(&_inbuf[1], (sz-1));
break;
case MSGTYPE_CPRNT:
printFT("MSGTYPE_CPRNT");
break;
case MSGTYPE_CQUIT:
bRun = false;
break;
case MSGTYPE_CPRNT_DV:
printDV();
break;
case MSGTYPE_CPRNT_NT:
printNT();
break;
default:
printf("From %s: unknown message type %d. The message is dropped.\n",_name,_inbuf[0]);
}
}
}
}
void router::forwrdMsg(const char* pMsg, size_t sz)
{
unsigned long* ulp = (unsigned long*) pMsg;
unsigned long dest;
dest = *ulp++;
ulp++; //srcIP
unsigned long len = *ulp;
(*ulp)++;
ulp++;
*(ulp+len) = _myIP;
if (toPrefix(dest) == toPrefix(_myIP))
{
_pcomm->sendMsg(dest, _inbuf, sz);
printf("From %s: forwrdMsg - delivered message to host 0x%x.\n"
,_name,dest);
}
else
{
struct in_addr ia;
#ifdef WIN32
ia.S_un.S_addr = dest;
#else
ia.s_addr = dest;
#endif
IFWMap::iterator ft_it = _fwd_table.find(toPrefix(dest));
if (ft_it == _fwd_table.end())
{ //??ming look BGP table
printf("From %s: Cannot forwar to %s. Messag is dropped\n",_name, inet_ntoa(ia));
return;
}
_pcomm->sendMsg((*ft_it).second, _inbuf, sz);
printf("From %s: forwrdMsg - forward message for 0x%x to router 0x%x.\n",
_name,dest,(*ft_it).second);
}
}
void router::updateDV(const char* pBuf, size_t sz)
{
unsigned long* lp = (unsigned long*)pBuf;
unsigned long fromAddr= *lp++; // source Router
struct in_addr ia;
#ifdef WIN32
ia.S_un.S_addr = fromAddr;
#else
ia.s_addr = fromAddr;
#endif
size_t numDV = *lp++; // numberDV
#ifdef _TRACE
printf("From %s/updateDV: called fromAddr %s, msgSize=%d,numEnter=%d.\n",
_name, inet_ntoa(ia), sz, numDV);
#endif
if ((sz - sizeof(long) - sizeof(long)) < numDV*sizeof(long))
{
printf("From %s-updateDV: number entry is %d, msgSize=%d, not match\n"
,_name, numDV, sz);
return;
}
pa3Map::iterator nt_it = _nbr_table.find(fromAddr); // get the neighbor
if (nt_it == _nbr_table.end())
{
printf("From %s: Unknown neighour %s.\n", _name, inet_ntoa(ia));
return;
}
pa3Map::iterator dv_it;
unsigned long dv_IP;
long dv_cost;
bool bMod = false;
struct in_addr ria;
IFWMap::iterator ft_it;
for (size_t i = 0 ; i < numDV; i++)
{
dv_IP = (unsigned long) *lp++;
dv_cost = *lp++;
if (dv_IP == toPrefix(_myIP))
continue;
#ifdef WIN32
ria.S_un.S_addr = dv_IP;
#else
ria.s_addr = dv_IP;
#endif
dv_cost += (*nt_it).second;
dv_it = _dv_table.find(dv_IP);
if (dv_it != _dv_table.end()) // is it in our dv
{
if ((*dv_it).second == -1) // was down
{
nt_it = _nbr_table.find(dv_IP); // if link is down, will
if (nt_it != _nbr_table.end()) // not accept from nbr
bMod = true;
}
else if ((*dv_it).second > dv_cost)
{
printf("--From %s: updateDV %d: change for %s new_cost=%d, my_dv=%d\n",
_name, i, inet_ntoa(ria), dv_cost,(*dv_it).second);
bMod = true;
}
else
{
ft_it = _fwd_table.find(dv_IP);
printFT("updateDV 3");
char temp[30];
strcpy(temp, inet_ntoa(ia));
if ((ft_it != _fwd_table.end())&&((*ft_it).first==dv_IP)&&
((*ft_it).second==fromAddr)&&((*dv_it).second!=dv_cost))
{
printf("--From %s: updateDV nbr=%s, prfx=%s change: new_cost=%d, my_dv=%d\n",
_name, temp, inet_ntoa(ria), dv_cost,(*dv_it).second);
bMod = true;
}
}
if (bMod)
{
_dv_table.erase(dv_it); // delete old one
_dv_table.insert(pa3Map::value_type(dv_IP, dv_cost));
ft_it = _fwd_table.find(dv_IP);
if (ft_it != _fwd_table.end())
{
_fwd_table.erase(ft_it);
if (dv_cost != -1)
_fwd_table.insert(IFWMap::value_type(dv_IP, fromAddr));
}
else
printf("From %s-updateDV: FT couldn't find dv_IP=%s, cost=%d, from 0x%x",
_name, inet_ntoa(ria), dv_cost, fromAddr);
}
}
else
{
bMod = true;
_dv_table.insert(pa3Map::value_type(dv_IP, dv_cost));
_fwd_table.insert(IFWMap::value_type(dv_IP, fromAddr));
printf("--From %s: updateDV %d: insert new_dv=(%s,%d))\n",
_name,i, inet_ntoa(ria), dv_cost);
}
}
if (bMod)
propaganda_DV();
}
void router::changeCost(const char* pBuf, size_t sz)
{
unsigned long* lp = (unsigned long*)pBuf;
lp++; // skip AS
unsigned long rIP;
rIP = *lp++;
if (rIP == _myIP)
rIP = *lp++; // source Router
else
lp++;
long dCost = *lp++; // new cost
pa3Map::iterator nt_it = _nbr_table.find(rIP); // get the neighbor
if (nt_it == _nbr_table.end())
{
printf("From %s: changeCost - wrong link nbrIP=0x%x, newCost=%d.\n"
,_name, rIP, dCost);
return;
}
long nbrCost;
long oldCost = (*nt_it).second;
_nbr_table.erase(nt_it); //delete old one
_nbr_table.insert(pa3Map::value_type(rIP, dCost));
dCost -= oldCost;
pa3Map::iterator dv_it;
IFWMap::iterator ft_it;
bool bMod = false;
unsigned long prf;
unsigned long hop;
for (ft_it = _fwd_table.begin(); ft_it != _fwd_table.end(); ft_it++)
{
hop = (*ft_it).second;
printf("From %s: changeCost - prf=%s,fw=%s.\n",_name,toIPString(prf),toIPString(hop));
if (hop == rIP)
{
prf = (*ft_it).first;
dv_it = _dv_table.find(prf);
oldCost = (*dv_it).second;
_dv_table.erase(dv_it); //delete old one
//if current path cost more then we have in neibour table, use neibour
for (nt_it = _nbr_table.begin(); nt_it != _nbr_table.end(); nt_it++)
{
if ((toPrefix((*nt_it).first)==prf)&&((*nt_it).second<(oldCost+dCost)))
{
_dv_table.insert(pa3Map::value_type(prf,(*nt_it).second));
_fwd_table.erase(ft_it);
_fwd_table.insert(IFWMap::value_type(prf, (*nt_it).first));
bMod = true;
break;
}
}
if (!bMod)
{
_dv_table.insert(pa3Map::value_type(prf, (oldCost+dCost)));
bMod = true;
}
}
}
if (bMod)
propaganda_DV();
}
bool router::updateTables(unsigned long rIP, bool bAS)
{
bool ret;
pa3Map::iterator dv_it, nt_it;
IFWMap::iterator ft_it;
unsigned long prf = toPrefix(rIP);
nt_it = _nbr_table.find(rIP); // if it is our nbr
bool bRep = false;
if ((!bAS) && (nt_it != _nbr_table.end()))
bRep = true;
unsigned long oldPfx;
for (ft_it = _fwd_table.begin(); ft_it != _fwd_table.end(); ft_it++)
{
if ((*ft_it).second == rIP)
{
oldPfx = (*ft_it).first;
dv_it = _dv_table.find(oldPfx);
_dv_table.erase(dv_it); //delete old one
_fwd_table.erase(ft_it);
if ((bRep) && (oldPfx != prf)) // change to nbr
{
_dv_table.insert(pa3Map::value_type((*nt_it).first, (*nt_it).second));
_fwd_table.insert(IFWMap::value_type(oldPfx, (*nt_it).first));
}
else
_dv_table.insert(pa3Map::value_type(oldPfx, -1));
ret = true;
if (_fwd_table.empty())
break;
}
}
#ifdef _TRACE
printf("From %s: updateTables rIP = %lu\n",_name, rIP);
#endif
return ret;
}
void router::downLink(const char* pBuf, size_t sz)
{
unsigned long* lp = (unsigned long*)pBuf;
lp++; // skip AS
unsigned long rIP;
rIP = *lp++;
if (rIP == _myIP)
rIP = *lp++; // source Router
else
lp++;
if (updateTables(rIP, false))
propaganda_DV();
}
// ??? ming not done yet
void router::ASdownLink(const char* pBuf, size_t sz)
{
unsigned long* lp = (unsigned long*)pBuf;
lp++; //skip AS id1
unsigned long rIP;
rIP = *lp++;
if (rIP == _myIP)
{
lp++; // skip AS id2
rIP = *lp++; // source Router
}
else
{
lp++;
lp++;
}
if (updateTables(rIP, true))
propaganda_DV();
}
void router::ASupink(const char* pBuf, size_t sz)
{
unsigned long* lp = (unsigned long*)pBuf;
lp++; //skip AS id1
unsigned long rIP;
rIP = *lp++;
if (rIP == _myIP)
{
lp++; // skip AS id2
rIP = *lp++; // source Router
}
else
{
lp++;
lp++;
}
bool bMod = false;
pa3Map::iterator nt_it = _nbr_table.find(rIP);
struct in_addr ia;
#ifdef WIN32
ia.S_un.S_addr = rIP;
#else
ia.s_addr = rIP;
#endif
if (nt_it == _nbr_table.end())
{
printf("From %s: unknown link to router %s. The message is ignored.\n"
,_name,inet_ntoa(ia));
return;
}
unsigned long prf = toPrefix(rIP);
pa3Map::iterator dv_it = _dv_table.find(prf);
IFWMap::iterator ft_it = _fwd_table.find(prf);
if (dv_it != _dv_table.end())
_dv_table.erase(dv_it);
if (ft_it != _fwd_table.end())
_fwd_table.erase(ft_it);
_dv_table.insert(pa3Map::value_type(prf, (*nt_it).second));
_fwd_table.insert(IFWMap::value_type(prf, rIP));
if (bMod)
propaganda_DV();
}
void router::printFT(const char *p)
{
IFWMap::iterator ft_it;
printf("Forward table for router %s:%s, called from %s:\n",pmyAS, _name, p);
fprintf(output,"Forward table for router %s:%s:\n",pmyAS,_name);
struct in_addr pfx;
struct in_addr hop;
char pPfx[50];
char pHop[50];
for (ft_it = _fwd_table.begin(); ft_it != _fwd_table.end(); ft_it++)
{
#ifdef WIN32
pfx.S_un.S_addr = (*ft_it).first;
hop.S_un.S_addr = (*ft_it).second;
#else
pfx.s_addr = (*ft_it).first;
hop.s_addr = (*ft_it).second;
#endif
strcpy(pPfx, inet_ntoa(pfx));
strcpy(pHop, inet_ntoa(hop));
printf("\t%s\t %s\n",pPfx,pHop);
fprintf(output,"\t%s\t %s\n",pPfx,pHop);
}
fflush(output);
}
void router::printDV()
{
pa3Map::iterator dv_it;
printf(" -- Dump DV table for router %s:\n",_name);
struct in_addr pfx;
for (dv_it = _dv_table.begin(); dv_it != _dv_table.end(); dv_it++)
{
#ifdef WIN32
pfx.S_un.S_addr = (*dv_it).first;
#else
pfx.s_addr = (*dv_it).first;
#endif
printf("\t%s\t %d\n",inet_ntoa(pfx),(*dv_it).second);
}
}
void router::printNT()
{
pa3Map::iterator nt_it;
printf(" -- Dump Nbr table for router %s:\n",_name);
struct in_addr pfx;
for (nt_it = _nbr_table.begin(); nt_it != _nbr_table.end(); nt_it++)
{
#ifdef WIN32
pfx.S_un.S_addr = (*nt_it).first;
#else
pfx.s_addr = (*nt_it).first;
#endif
printf("\t%s\t %d\n",inet_ntoa(pfx),(*nt_it).second);
}
}
void router::propaganda_DV()
{
#ifdef WIN32
Sleep(20);
#else
usleep(20);
#endif
pa3Map::iterator dv_it;
_outbuf[0] = MSGTYPE_RDV;
unsigned long* lp = (unsigned long*)(&_outbuf[1]);
size_t i = 0;
*lp++ = _myIP;
i++;
*lp++ = _dv_table.size() - 1; // subtract myself
i++;
#ifdef _TRACE
printf("++From %s: propaganda_DV - ", _name);
#endif
for (dv_it = _dv_table.begin(); dv_it != _dv_table.end(); dv_it++)
{
if ((*dv_it).second != 0) // myself
{
*lp++ = (*dv_it).first;
i++;
*lp++ = (*dv_it).second;
i++;
#ifdef _TRACE
printf("%d=(0x%x,%d), ", i, (*dv_it).first, (*dv_it).second);
#endif
}
}
pa3Map::iterator nt_it;
for (nt_it = _nbr_table.begin(); nt_it != _nbr_table.end(); nt_it++)
{
// need to kick out if not in my AS
_pcomm->sendMsg((*nt_it).first, _outbuf, i*sizeof(long)+1);
}
#ifdef _TRACE
printf("From %s: propaganda_DV called %d #tableE=%d, i=%d.\n", _name, _cprop++,_dv_table.size(),i);
#endif
}