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/*
* Module: lbtest_icmp.cc
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <syslog.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/sysinfo.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/udp.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <errno.h>
#include <string.h>
#include <memory>
#include <time.h>
#include <sys/timeb.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include <algorithm>
#include "lbdata.hh"
#include "lbtest_icmp.hh"
using namespace std;
/**
*
*
**/
void
LBTestICMP::send(LBHealth &health)
{
//iterate over packets and send
string target = _target;
if (target.empty()) {
if (health._nexthop == "dhcp") {
target = health._dhcp_nexthop;
}
else {
target = health._nexthop;
}
}
//set the status line to be used when the show command is invoked
_status_line = name() + "\t" + string("Target: ") + target;
//don't have target yet...
if (target.empty()) {
return;
}
//instead of prefix to avoid this compilier warning:
//warning: operation on ‘LBTest::_packet_id’ may be undefined
_packet_id = int((_packet_id + 1) % int(32767));
if (_debug) {
cout << "ICMPEngine::start(): sending ping test for: " << health._interface << " for " << target << " id: " << _packet_id << endl;
}
send(_send_icmp_sock, health._interface, target, _packet_id);
_results.insert(pair<int,PktData>(_packet_id,PktData(health._interface,-1)));
return;
}
/**
*
*
**/
void
LBTestICMP::send(int send_sock, const string &iface, const string &target_addr, int packet_id)
{
int err;
sockaddr_in taddr;
timeval send_time;
icmphdr *icmp_hdr;
int icmp_pktsize = 40;
char buffer[icmp_pktsize];
if (iface.empty() || target_addr.empty()) {
return;
}
//convert target_addr to ip addr
struct hostent *h = gethostbyname(target_addr.c_str());
if (h == NULL) {
if (_debug) {
cerr << "ICMPEngine::send() Error in resolving hostname" << endl;
}
syslog(LOG_ERR, "wan_lb: error in resolving configured hostname: %s", target_addr.c_str());
return;
}
// bind a socket to a device name (might not work on all systems):
if (setsockopt(send_sock, SOL_SOCKET, SO_BINDTODEVICE, iface.c_str(), iface.size()) != 0) {
syslog(LOG_ERR, "wan_lb: failure to bind to interface: %s", iface.c_str());
return; //will allow the test to time out then
}
icmp_hdr = (struct icmphdr *)buffer;
icmp_hdr->type = ICMP_ECHO;
icmp_hdr->code = 0;
icmp_hdr->checksum = 0;
icmp_hdr->un.echo.id = htons(getpid());
icmp_hdr->un.echo.sequence = 0;
int length = sizeof(buffer);
//we'll put in time of packet sent for the heck of it, may
//want to use this in future tests, feel free to remove.
gettimeofday(&send_time, (struct timezone*)NULL);
char* datap = &buffer[8];
memcpy(datap, (char*)&send_time.tv_sec, sizeof(send_time.tv_sec));
datap = &buffer[12];
memcpy(datap, (char*)&send_time.tv_usec, sizeof(send_time.tv_usec));
datap = &buffer[16];
memcpy(datap, (char*)&packet_id, sizeof(packet_id)); //packet id
datap = &buffer[18];
int val(icmp_pktsize);
memcpy(datap, (char*)&val, 2); //packet id
icmp_hdr->un.echo.sequence = 1;
icmp_hdr->checksum = 0;
icmp_hdr->checksum = in_checksum((unsigned short *)icmp_hdr,length>>1);
struct in_addr ia;
memcpy(&ia, h->h_addr_list[0], sizeof(ia));
unsigned long addr = ia.s_addr;
taddr.sin_addr.s_addr = addr;
taddr.sin_family = AF_INET;
bzero(&(taddr.sin_zero), 8);
//need to direct this packet out a specific interface!!!!!!!!!!!!!
err = sendto(send_sock, buffer, icmp_pktsize, 0, (struct sockaddr*)&taddr, sizeof(taddr));
if (_debug) {
cout << "ICMPEngine::send(): sendto: " << err << ", packet id: " << packet_id << endl;
}
if(err < 0) {
if (_debug) {
if (errno == EBADF)
cout << "EBADF" << endl;
else if (errno == ENOTSOCK)
cout << "ENOTSOCK" << endl;
else if (errno == EFAULT)
cout << "EFAULT" << endl;
else if (errno == EMSGSIZE)
cout << "EMSGSIZE" << endl;
else if (errno == EWOULDBLOCK)
cout << "EWOULDBLOCK" << endl;
else if (errno == EAGAIN)
cout << "EAGAIN" << endl;
else if (errno == ENOBUFS)
cout << "ENOBUFS" << endl;
else if (errno == EINTR)
cout << "EINTR" << endl;
else if (errno == ENOMEM)
cout << "ENOMEM" << endl;
else if (errno == EACCES)
cout << "EACCES" << endl;
else if (errno == EINVAL)
cout << "EINVAL" << endl;
else if (errno == EPIPE)
cout << "EPIPE" << endl;
else
cout << "unknown error: " << errno << endl;
}
syslog(LOG_ERR, "wan_lb: error on sending icmp packet: %d", errno);
}
}
/**
*
*
**/
string
LBTestICMP::status()
{
//set the status line to be used when the show command is invoked
return name() + "\t" + string("Target: ") + _target;
}
/**
*
*
**/
unsigned short
LBTestICMP::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;
}
/**
*
*
**/
string
LBTestICMP::dump()
{
char buf[20];
sprintf(buf,"%u",_resp_time);
return (string("target: ") + _target + ", resp_time: " + buf);
}
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