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/**
* Module: Hosts
* Description: Host IP and last response time for all responding hosts
* on this LAN segment. This tool uses a broadcast icmp test packet.
*
* Note that hosts can also be identified via ARP progressing through
* all possible addresses on lan segment.
*
* Author: Michael Larson
* email: mike(at)lrlart.com
* Date: August 2004
**/
#include <ostream.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/udp.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <errno.h>
#include <memory>
#include <time.h>
#include <sys/timeb.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream.h>
#include <string>
#include <algorithm>
#include "Hosts.hpp"
#include "HostsResult.hpp"
#include "HostsTool.hpp"
//constant initialization
const int HostsToolKonstants::packet_data_len_ = 40;
const int HostsToolKonstants::recv_timeout_ = 5;
const int HostsToolKonstants::ip_offset_ = 12;
/**
* HostsTool::HostsTool()
* Constructor. Builds socket for use in tests.
*
**/
HostsTool::HostsTool(Task<Test> *complete_task, unsigned long local_ip, unsigned long bc_addr) :
ToolBase(complete_task),
local_ip_(local_ip),
send_sock_(0),
recv_sock_(0),
bc_addr_(bc_addr),
packet_id_(0),
test_in_progress_(false)
{
sockaddr_in addr;
struct protoent *ppe = getprotobyname("icmp");
send_sock_ = socket(PF_INET, SOCK_RAW, ppe->p_proto);
if (send_sock_ < 0)
{
cerr << "HostsTool::HostsTool(): no send sock: " << send_sock_ << endl;
send_sock_ = 0;
return;
}
//set options for broadcasting.
int val = 1;
setsockopt(send_sock_, SOL_SOCKET, SO_BROADCAST, &val, 4);
setsockopt(send_sock_, SOL_SOCKET, SO_REUSEADDR, &val, 4);
memset( &addr, 0, sizeof( struct sockaddr_in ));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_ANY);
addr.sin_port = 0;
recv_sock_ = socket(PF_INET, SOCK_RAW, ppe->p_proto);
if (recv_sock_ < 0)
{
cerr << "HostsTool::HostsTool(): no recv sock: " << recv_sock_ << endl;
recv_sock_ = 0;
return;
}
}
/**
* HostsTool::~HostsTools()
* Destructor, cleans up sockets
*
**/
HostsTool::~HostsTool()
{
if (send_sock_ != 0)
close(send_sock_);
if (recv_sock_ != 0)
close(recv_sock_);
}
/**
* HostsTool::compute()
* initiates tests received in its message queue.
*
**/
void
HostsTool::compute()
{
while (true)
{
auto_ptr<Test> test(get()); //don't bother keeping this Test object..
cout << "HostsTool::compute(): received test event..." << endl;
if (test.get() != NULL)
{
GUARD(&mutex_); //protect against concurrent access to test_in_progress_ flag
/*
Note that on heavily cycled tests some tests may be dropped. This can be fixed
by monitoring input queue on completion of sending and processing all incoming
messages into a set. This isn't expected to be a problem with the current impl.
*/
if (test_in_progress_ == true)
continue;
if (test->get_target() == 0)
{
send(bc_addr_, packet_id_++);
}
else
{
send(test->get_target(), packet_id_++);
}
}
}
}
/**
* HostsTool::finish()
* processes completed tests and pushes results to manager
*
**/
void
HostsTool::finish()
{
while (true)
{
HostsResult *host_result = receive();
// cout << "HostsTool::finish(): received result: " << host_result << endl;
if (host_result != NULL)
{
GUARD(&mutex_);
test_in_progress_ = false;
if (host_result->empty() == false)
{
Test *test = new Test(kHosts);
test->set_result(host_result);
// cout << "HostsTool::finish(), dispatching result" << endl;
results(test);
}
}
}
}
/**
* HostsTool::send()
* pushes the icmp packet out on the wire.
*
**/
void
HostsTool::send(unsigned long target_addr, unsigned short packet_id)
{
int err;
->type) << endl;
}
}
else
{
cerr << "HostsTool::receive(): error from recvfrom" << endl;
}
}
//then push result upwards
return host_result;
}
/**
* HostsTool::in_checksum()
* computes checksum that accompanies sending icmp packet
*
**/
unsigned short
HostsTool::in_checksum(const unsigned short *buffer, int length) const
{
unsigned long sum;
for (sum=0; length>0; length--)
sum += *buffer++;
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
return ~sum;
}
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