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tdenetwork/lanbrowsing/lisa/netscanner.cpp

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/* netscanner.cpp
*
* Copyright (c) 2000, Alexander Neundorf,
* neundorf@kde.org
*
* You may distribute under the terms of the GNU General Public
* License as specified in the COPYING file.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include "config.h"
#include "netscanner.h"
#include "ipaddress.h"
#include "lisadefines.h"
#include <iostream>
#ifdef LISA_DEBUG
#undef LISA_DEBUG
#endif
#define LISA_DEBUG 0
#ifdef dcerr
#undef dcerr
#endif
#ifdef mdcerr
#undef mdcerr
#endif
#define dcerr if (LISA_DEBUG==1) std::cerr<<"NetScanner::"
#define mdcerr if (LISA_DEBUG==1) std::cerr<<procId<<" NetScanner::"
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#ifdef __osf__
#undef BYTE_ORDER
#define _OSF_SOURCE
#undef _MACHINE_ENDIAN_H_
#undef __STDC__
#define __STDC__ 0
#include <netinet/ip.h>
#undef __STDC__
#define __STDC__ 1
#endif
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#ifndef INADDR_NONE
#define INADDR_NONE -1
#endif
struct ICMPEchoRequest
{
unsigned char type;
unsigned char code;
unsigned short int checkSum;
unsigned short id;
unsigned short seqNumber;
};
unsigned short in_cksum(unsigned short *addr, int len)
{
int nleft = len;
int sum(0);
unsigned short *w = addr;
unsigned short answer = 0;
/*
* Our algorithm is simple, using a 32 bit accumulator (sum), we add
* sequential 16 bit words to it, and at the end, fold back all the
* carry bits from the top 16 bits into the lower 16 bits.
*/
while (nleft > 1)
{
sum += *w++;
nleft -= 2;
}
/* 4mop up an odd byte, if necessary */
if (nleft == 1)
{
*(unsigned char *)(&answer) = *(unsigned char *)w ;
sum += answer;
}
/* 4add back carry outs from top 16 bits to low 16 bits */
sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
sum += (sum >> 16); /* add carry */
answer = ~sum; /* truncate to 16 bits */
return(answer);
}
NetScanner::NetScanner(int& rawSocketFD, int strictMode)
:procId("")
,m_firstWait(5)
,m_secondWait(15)
,m_strictMode(strictMode)
,m_rawSocketFD(rawSocketFD)
,validator()
,ipRangeStr(";")
,m_maxPings(256)
,m_deliverUnnamedHosts(0)
,m_useNmblookup(0)
,hostList(0)
,tmpIPRange("")
{}
NetScanner::~NetScanner()
{
// std::cerr<<"----------- Netscanner dtor "<<std::endl;
delete hostList;
::close(m_rawSocketFD);
}
void addMissingSemicolon(MyString& text)
{
if (text.isEmpty()) return;
if (text[text.length()-1]!=';')
text+=';';
}
void NetScanner::configure(Config& config)
{
//ranges are not allowed in strict mode
if (!m_strictMode)
{
ipRangeStr=stripWhiteSpace(config.getEntry("PingAddresses",""));
addMissingSemicolon(ipRangeStr);
}
MyString pingNames=stripWhiteSpace(config.getEntry("PingNames",""));
addMissingSemicolon(pingNames);
MyString nextName;
int semicolonPos=pingNames.find(';');
int hostsAdded(0);
while (semicolonPos!=-1)
{
nextName=pingNames.left(semicolonPos);
mdcerr<<"configure(): looking up -"<<nextName<<"-"<<std::endl;
//now the name lookup
in_addr server_addr;
hostent *hp=gethostbyname(nextName.data());
if (hp!=0)
{
if ((m_strictMode) && (hostsAdded>=STRICTMODEMAXHOSTS))
break;
memcpy(&server_addr, hp->h_addr, sizeof(server_addr));
char *ip=inet_ntoa(server_addr);
mdcerr<<"configure(): looking up "<<nextName<<" gives -"<<ip<<"-"<<std::endl;
ipRangeStr=ipRangeStr+ip+';';
hostsAdded++;
}
pingNames=pingNames.mid(semicolonPos+1);
semicolonPos=pingNames.find(';');
}
if ((!ipRangeStr.isEmpty()) && (ipRangeStr[0]==';'))
ipRangeStr=ipRangeStr.mid(1);
m_deliverUnnamedHosts=config.getEntry("DeliverUnnamedHosts",0);
m_useNmblookup=config.getEntry("SearchUsingNmblookup",0);
m_maxPings=config.getEntry("MaxPingsAtOnce",256);
m_firstWait=config.getEntry("FirstWait",5);
m_secondWait=config.getEntry("SecondWait",15);
if (m_firstWait<1) m_firstWait=1;
if (m_maxPings<8) m_maxPings=8;
if (m_maxPings>1024) m_maxPings=1024;
//on some systems (Solaris ?) select() doesn't work correctly
// if the microseconds are more than 1.000.000
if (m_firstWait>99) m_firstWait=99;
if (m_secondWait>99) m_secondWait=99;
mdcerr<<"configure(): "<<ipRangeStr<<std::endl;
}
struct in_addr NetScanner::getIPfromArray(unsigned int index)
{
//mdcerr<<std::endl<<"*** start ***"<<std::endl;
unsigned int tmpIndex(0),indexLeft(index);
resetIPRange();
MyString tmp(getNextIPRange());
// mdcerr<<"NetScanner::getIPFromArray: -"<<tmp<<"-"<<std::endl;
while (!tmp.isEmpty())
{
if (tmp.contains('/'))
{
//mdcerr<<"net/mask combination detected"<<std::endl;
MyString netStr(tmp.left(tmp.find("/")));
MyString maskStr(tmp.mid(tmp.find("/")+1));
unsigned int mask(IPAddress(maskStr).asInt());
unsigned int net(IPAddress(netStr).asInt()&mask);
if ((~mask)<indexLeft)
{
indexLeft=indexLeft-(~mask+1);
tmpIndex+=(~mask)+1;
//mdcerr<<"i: "<<tmpIndex<<" left: "<<indexLeft<<std::endl;
}
else
{
net+=indexLeft;
return IPAddress(net).asStruct();
//return string2Struct(ipInt2String(net));
}
}
else if (tmp.contains('-')==1)
{
//mdcerr<<"single range detected"<<std::endl;
MyString fromIPStr(tmp.left(tmp.find("-")));
MyString toIPStr(tmp.mid(tmp.find("-")+1));
//mdcerr<<"fromIPStr: "<<fromIPStr<<std::endl;
//mdcerr<<"toIPStr: "<<toIPStr<<std::endl;
unsigned int fromIP(IPAddress(fromIPStr).asInt());
unsigned int toIP(IPAddress(toIPStr).asInt());
//unsigned int fromIP(ipString2Int(fromIPStr)), toIP(ipString2Int(toIPStr));
//index hinter diesem bereich
if ((fromIP+indexLeft)>toIP)
{
tmpIndex+=1+toIP-fromIP;
indexLeft=indexLeft-(1+toIP-fromIP);
//mdcerr<<"i: "<<tmpIndex<<" left: "<<indexLeft<<std::endl;
}
//index in diesem bereich
else
{
fromIP+=indexLeft;
return IPAddress(fromIP).asStruct();
//return string2Struct(ipInt2String(fromIP));
}
}
else if (tmp.contains('-')==4)
{
//mdcerr<<"multiple range detected"<<std::endl;
int cp(tmp.find('-'));
int from1(atoi(tmp.left(cp).data()));
tmp=tmp.mid(cp+1);
cp=tmp.find('.');
int to1(atoi(tmp.left(cp).data()));
tmp=tmp.mid(cp+1);
cp=tmp.find('-');
int from2(atoi(tmp.left(cp).data()));
tmp=tmp.mid(cp+1);
cp=tmp.find('.');
int to2(atoi(tmp.left(cp).data()));
tmp=tmp.mid(cp+1);
cp=tmp.find('-');
int from3(atoi(tmp.left(cp).data()));
tmp=tmp.mid(cp+1);
cp=tmp.find('.');
int to3(atoi(tmp.left(cp).data()));
tmp=tmp.mid(cp+1);
cp=tmp.find('-');
int from4(atoi(tmp.left(cp).data()));
tmp=tmp.mid(cp+1);
int to4(atoi(tmp.data()));
unsigned int count((1+to4-from4)*(1+to3-from3)*(1+to2-from2)*(1+to1-from1));
if (count<indexLeft)
{
tmpIndex+=count;
indexLeft-=count;
//mdcerr<<"i: "<<tmpIndex<<" left: "<<indexLeft<<std::endl;
}
else
{
for (int b1=from1; b1<=to1; b1++)
for (int b2=from2; b2<=to2; b2++)
for (int b3=from3; b3<=to3; b3++)
for (int b4=from4; b4<=to4; b4++)
{
if (tmpIndex==index)
{
return IPAddress(b1,b2,b3,b4).asStruct();
};
tmpIndex++;
indexLeft--;
//mdcerr<<"i: "<<tmpIndex<<" left:"<<indexLeft<<std::endl;
}
}
}
//single IP address
else if (tmp.contains('.')==3)
{
//mdcerr<<"single IP address detected"<<std::endl;
//if (tmpIndex==index) return string2Struct(tmp);
if (tmpIndex==index) return IPAddress(tmp).asStruct();
else
{
tmpIndex++;
indexLeft--;
//mdcerr<<"i: "<<tmpIndex<<" left: "<<indexLeft<<std::endl;
}
}
//mdcerr<<"nextIPRange: *"<<tmp<<"*"<<std::endl;
tmp=getNextIPRange();
}
return IPAddress("0.0.0.0").asStruct();
}
void NetScanner::resetIPRange()
{
tmpIPRange=ipRangeStr;
}
MyString NetScanner::getNextIPRange()
{
if (tmpIPRange.contains(';')<1) return "";
int cp(tmpIPRange.find(';'));
MyString tmp(tmpIPRange.left(cp));
tmpIPRange=tmpIPRange.mid(cp+1);
return tmp;
}
char* NetScanner::ip2Name(struct in_addr ip)
{
struct hostent *hostname=0;
// Set the hostname of node
if ( ( hostname = gethostbyaddr( (char *) &ip.s_addr, 4, AF_INET ) ) == 0 )
{
mdcerr << "ip2Name gethostbyname* error" << std::endl;
return inet_ntoa( ip );
}
mdcerr<<"ip2name -"<<hostname->h_name<<std::endl;
return hostname->h_name;
}
void NetScanner::nmblookupScan(std::list<Node>* newList)
{
mdcerr<<"nmblookupScan()"<<std::endl;
//newList->clear();
FILE * nmblookupFile=popen("nmblookup \"*\"","r");
//no success
if (nmblookupFile==0)
{
mdcerr<<"nmblookupScan(): could not start nmblookup"<<std::endl;
return;
};
MyString dummy("");
char *receiveBuffer=0;
int bufferSize(0);
int nmblookupFd=fileno(nmblookupFile);
struct timeval tv;
fd_set fds;
int done(0);
int timeOuts(0);
char *tmpBuf=new char[16*1024];
do
{
FD_ZERO(&fds);
FD_SET(nmblookupFd,&fds);
tv.tv_sec=10;
tv.tv_usec=0;
int result=select(nmblookupFd+1,&fds,0,0,&tv);
//error
if (result<0)
done=1;
//timeout
else if (result==0)
{
timeOuts++;
//3 time outs make 30 seconds, this should be *much* more than enough
if (timeOuts>=3)
done=1;
}
else if (result>0)
{
//read stuff
int bytesRead=::read(nmblookupFd,tmpBuf,16*1024);
//pipe closed
if (bytesRead==0)
done=1;
else
{
char *newBuf=new char[bufferSize+bytesRead];
if (receiveBuffer!=0)
{
memcpy(newBuf,receiveBuffer,bufferSize);
delete [] receiveBuffer;
}
memcpy(newBuf+bufferSize,tmpBuf,bytesRead);
receiveBuffer=newBuf;
bufferSize+=bytesRead;
}
}
} while (!done);
// Warning: The return value of pclose may be incorrect due to the
// SIGCHLD handler that is installed. Ignore it!
pclose(nmblookupFile);
delete [] tmpBuf;
//we received nothing
if (receiveBuffer==0)
return;
//check for a terrminating '\0'
if (receiveBuffer[bufferSize-1]=='\0')
receiveBuffer[bufferSize-1]='\0';
//std::cerr<<receiveBuffer<<std::endl;
tmpBuf=receiveBuffer;
int bytesLeft=bufferSize;
int bufferState=0;
while (bytesLeft>0)
{
//mdcerr<<"bytesLeft: "<<bytesLeft<<" received: "<<bufferSize<<std::endl;
//since we added a terminating \0 we can be sure here
char *endOfLine=(char*)memchr(tmpBuf,'\n',bytesLeft);
//point to the last character
if (endOfLine==0)
endOfLine=receiveBuffer+bufferSize-1;
//0-terminate the string
*endOfLine='\0';
//now tmpBuf to endOfLine is a 0-terminated string
int strLength=strlen(tmpBuf);
//hmm, if this happens, there must be something really wrong
if (strLength>1000)
break;
bytesLeft=bytesLeft-strLength-1;
if (bufferState==0)
{
if (isdigit(tmpBuf[0]))
bufferState=1;
}
//yes, no else !
if (bufferState==1)
{
char tmpIP[1024];
//std::cerr<<"tmpBuf: -"<<tmpBuf<<"-"<<std::endl;
if (sscanf(tmpBuf,"%s *<00>\n",tmpIP) == 1) {
mdcerr<<"nmblookupScan: tmpIP: -"<<tmpIP<<"-"<<std::endl;
struct sockaddr_in addr;
if ((addr.sin_addr.s_addr = inet_addr(tmpIP)) != INADDR_NONE)
if (!hostAlreadyInList(addr.sin_addr.s_addr,newList))
{
if (validator.isValid(addr.sin_addr.s_addr))
{
mdcerr<<"nmblookupScan: adding "<<inet_ntoa(addr.sin_addr)<<std::endl;
newList->push_back(Node(dummy,addr.sin_addr.s_addr));
}
}
}
}
tmpBuf=endOfLine+1;
};
mdcerr<<"nmblookupScan: finished"<<std::endl;
delete [] receiveBuffer;
}
void NetScanner::pingScan(std::list<Node>* newList) //the ping-version
{
mdcerr<<"pingScan()"<<std::endl;
//newList->clear();
MyString dummy("");
mdcerr<<"pingScan: m_maxPings: "<<m_maxPings<<std::endl;
pid_t pid=getpid();
ICMPEchoRequest echo;
echo.type=ICMP_ECHO;
echo.code=0;
echo.id=pid;
echo.seqNumber=0;
echo.checkSum=0;
echo.checkSum=in_cksum((unsigned short *)&echo,8);
char receiveBuf[16*1024];
//before we start first read everything what might be in the receive buffer
//of the raw socket
timeval tv1;
//wait a moment for answers
tv1.tv_sec = 0;
tv1.tv_usec = 0;
fd_set clearSet;
FD_ZERO(&clearSet);
FD_SET(m_rawSocketFD,&clearSet);
while(select(m_rawSocketFD,&clearSet,0,0,&tv1)>0)
{
::recvfrom(m_rawSocketFD,(char*)&receiveBuf,16*1024,0,0,0);
tv1.tv_sec = 0;
tv1.tv_usec = 0;
FD_ZERO(&clearSet);
FD_SET(m_rawSocketFD,&clearSet);
}
//now the buffer should be empty
//wait a moment for answers
tv1.tv_sec = 0;
tv1.tv_usec = m_firstWait*10*1000;//0.5 sec
int loopCount(2);
if (m_secondWait<0)
loopCount=1;
for (int repeatOnce=0; repeatOnce<loopCount; repeatOnce++)
{
mdcerr<<"******************** starting loop *****************"<<std::endl;
unsigned int current(0);
int finished(0);
while (!finished)
{
for (int con=0; con<m_maxPings; con++)
{
struct in_addr tmpIP;
do
{
tmpIP=getIPfromArray(current);
current++;
// mdcerr<<"pingScan(): trying "<<inet_ntoa(tmpIP)<<std::endl;
if (hostAlreadyInList(tmpIP.s_addr,newList))
mdcerr<<"already in list :-)"<<std::endl;
if (!validator.isValid(tmpIP.s_addr))
mdcerr<<"pingScan(): invalid IP :-("<<std::endl;
//ping only hosts which are allowed to receive the results
//and which are not in the list
} while ( (tmpIP.s_addr!=0)
&& ((!validator.isValid(tmpIP.s_addr))
|| (hostAlreadyInList(tmpIP.s_addr,newList))));
finished=(tmpIP.s_addr==0);
if (!finished)
{
//send the icmp echo request
struct sockaddr_in toAddr;
toAddr.sin_family = AF_INET;
toAddr.sin_addr = tmpIP;
toAddr.sin_port = 0;
(void)sendto(m_rawSocketFD,(char*)&echo,sizeof(echo),0,(sockaddr*)&toAddr,sizeof(toAddr));
//int sb=sendto(sockFD,(char*)&echo,sizeof(echo),0,(sockaddr*)&toAddr,sizeof(toAddr));
// mdcerr<<"pingScan: pinging "<<inet_ntoa(toAddr.sin_addr)<<std::endl;
}
else break;
}
select(0,0,0,0,&tv1);
//now read the answers, hopefully
struct sockaddr_in fromAddr;
socklen_t length(sizeof(fromAddr));
int received(0);
fd_set sockFDset;
FD_ZERO(&sockFDset);
FD_SET(m_rawSocketFD,&sockFDset);
tv1.tv_sec=0;
tv1.tv_usec=0;
while(select(m_rawSocketFD+1,&sockFDset,0,0,&tv1)>0)
{
received=recvfrom(m_rawSocketFD, (char*)&receiveBuf, 16*1024, 0,
(sockaddr*)&fromAddr, &length);
if (received!=-1)
{
// mdcerr<<"pingScan: received from "<<inet_ntoa(fromAddr.sin_addr)<<" "<<received<<" b, ";
struct ip *ipFrame=(ip*)&receiveBuf;
int icmpOffset=(ipFrame->ip_hl)*4;
icmp *recIcmpFrame=(icmp*)(receiveBuf+icmpOffset);
int iType=recIcmpFrame->icmp_type;
//if its a ICMP echo reply
if ((iType==ICMP_ECHOREPLY)
//to an echo request we sent
&& (recIcmpFrame->icmp_id==pid)
//and the host is not yet in the list
&& (!hostAlreadyInList(fromAddr.sin_addr.s_addr,newList)))
{
//this is an answer to our request :-)
// mdcerr<<"pingScan: adding "<<inet_ntoa(fromAddr.sin_addr)<<std::endl;
newList->push_back(Node(dummy,fromAddr.sin_addr.s_addr));
}
}
tv1.tv_sec=0;
tv1.tv_usec=0;
FD_ZERO(&sockFDset);
FD_SET(m_rawSocketFD,&sockFDset);
//FD_SET(sockFD,&sockFDset);
}
}
tv1.tv_sec = 0;
tv1.tv_usec = m_secondWait*10*1000;//0.5 sec
}
mdcerr<<"pingScan() ends"<<std::endl;
}
void NetScanner::doScan()
{
mdcerr<<"doScan"<<std::endl;
//child
std::list<Node>* tmpPingList=new std::list<Node>;
mdcerr<<"doScan: created list"<<std::endl;
if (m_useNmblookup)
nmblookupScan(tmpPingList);
pingScan(tmpPingList);
// get the names from cache or lookup
completeNames(tmpPingList);
mdcerr<<"doScan: completed names"<<std::endl;
if (m_deliverUnnamedHosts==0)
removeUnnamedHosts(tmpPingList);
mdcerr<<"doScan: added hosts"<<std::endl;
delete hostList;
hostList=tmpPingList;
}
int NetScanner::hostAlreadyInList(int ip, std::list<Node>* nodes)
{
for (std::list<Node>::iterator node = nodes->begin(); node != nodes->end(); node++)
{
if (node->ip==ip)
return 1;
}
return 0;
}
void NetScanner::removeUnnamedHosts(std::list<Node>* nodes)
{
nodes->remove_if(is_unnamed_node());
}
void NetScanner::completeNames(std::list<Node>* nodes)
{
struct sockaddr_in tmpAddr;
//for every host
for (std::list<Node>::iterator node = nodes->begin(); node != nodes->end(); node++)
{
tmpAddr.sin_addr.s_addr=node->ip;
mdcerr<<"completeNames: looking up "<<inet_ntoa(tmpAddr.sin_addr)<<std::endl;
int done(0);
//first look wether we have the name already
if (hostList!=0) for (std::list<Node>::iterator oldNode=hostList->begin(); oldNode!=hostList->end(); oldNode++)
{
if (node->ip==oldNode->ip)
{
mdcerr<<"completeNames: cached: "<<oldNode->name<<" :-)"<<std::endl;
node->name=oldNode->name;
done=1;
break;
}
}
//otherwise do a name lookup
if (!done)
{
//IPAddress tmpAddress(node->ip);
//mdcerr<<"NetScanner::completeNames: doing actual lookup"<<std::endl;
node->name=ip2Name(tmpAddr.sin_addr);
mdcerr<<"completeNames: resolved: "<<node->name<<std::endl;
}
}
}
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