Fehlertolerantes IPoE-Netzwerk zur Hand

#include <stdio.h> #include <sys/types.h> #include <ifaddrs.h> #include <netinet/in.h> #include <string.h> #include <arpa/inet.h> #include <tins/tins.h> #include <map> #include <iostream> #include <functional> #include <sstream> using std::cout; using std::endl; using std::map; using std::bind; using std::string; using std::stringstream; using namespace Tins; class arp_monitor { public: void run(Sniffer &sniffer); void reroute(); void makegws(); string iface; map <string, string> gws; private: bool callback(const PDU &pdu); map <string, string> route_map; map <string, string> mac_map; map <IPv4Address, HWAddress<6>> addresses; }; void arp_monitor::makegws() { struct ifaddrs *ifAddrStruct = NULL; struct ifaddrs *ifa = NULL; void *tmpAddrPtr = NULL; gws.clear(); getifaddrs(&ifAddrStruct); for (ifa = ifAddrStruct; ifa != NULL; ifa = ifa->ifa_next) { if (!ifa->ifa_addr) { continue; } string ifName = ifa->ifa_name; if (ifName == "lo") { char addressBuffer[INET_ADDRSTRLEN]; if (ifa->ifa_addr->sa_family == AF_INET) { // check it is IP4 // is a valid IP4 Address tmpAddrPtr = &((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN); } else if (ifa->ifa_addr->sa_family == AF_INET6) { // check it is IP6 // is a valid IP6 Address tmpAddrPtr = &((struct sockaddr_in6 *) ifa->ifa_addr)->sin6_addr; inet_ntop(AF_INET6, tmpAddrPtr, addressBuffer, INET6_ADDRSTRLEN); } else { continue; } gws[addressBuffer] = addressBuffer; cout << "GW " << addressBuffer << " is added" << endl; } } if (ifAddrStruct != NULL) freeifaddrs(ifAddrStruct); } void arp_monitor::run(Sniffer &sniffer) { cout << "RUNNED" << endl; sniffer.sniff_loop( bind( &arp_monitor::callback, this, std::placeholders::_1 ) ); } void arp_monitor::reroute() { cout << "REROUTING" << endl; map<string, string>::iterator it; for ( it = route_map.begin(); it != route_map.end(); it++ ) { if (this->gws.count(it->second) && !this->gws.count(it->second)) { string cmd = "ip route replace "; cmd += it->first; cmd += " dev " + this->iface; cmd += " src " + it->second; cmd += " proto static"; cout << cmd << std::endl; cout << "REROUTE " << it->first << " SRC " << it->second << endl; system(cmd.c_str()); cmd = "arp -s "; cmd += it->first; cmd += " "; cmd += mac_map[it->first]; cout << cmd << endl; system(cmd.c_str()); } } for ( it = gws.begin(); it != gws.end(); it++ ) { string cmd = "arping -U -s "; cmd += it->first; cmd += " -I "; cmd += this->iface; cmd += " -b -c 1 "; cmd += it->first; system(cmd.c_str()); } cout << "REROUTED" << endl; } bool arp_monitor::callback(const PDU &pdu) { // Retrieve the ARP layer const ARP &arp = pdu.rfind_pdu<ARP>(); if (arp.opcode() == ARP::REQUEST) { string target = arp.target_ip_addr().to_string(); string sender = arp.sender_ip_addr().to_string(); this->route_map[sender] = target; this->mac_map[sender] = arp.sender_hw_addr().to_string(); cout << "save sender " << sender << ":" << this->mac_map[sender] << " want taregt " << target << endl; if (this->gws.count(target) && !this->gws.count(sender)) { string cmd = "ip route replace "; cmd += sender; cmd += " dev " + this->iface; cmd += " src " + target; cmd += " proto static"; // cout << cmd << std::endl; /* cout << "ARP REQUEST FROM " << arp.sender_ip_addr() << " for address " << arp.target_ip_addr() << " sender hw address " << arp.sender_hw_addr() << std::endl << " run cmd: " << cmd << endl;*/ system(cmd.c_str()); cmd = "arp -s "; cmd += arp.sender_ip_addr().to_string(); cmd += " "; cmd += arp.sender_hw_addr().to_string(); cout << cmd << endl; system(cmd.c_str()); } } return true; } arp_monitor monitor; void reroute(int signum) { monitor.makegws(); monitor.reroute(); } int main(int argc, char *argv[]) { string test; cout << sizeof(string) << endl; if (argc != 2) { cout << "Usage: " << *argv << " <interface>" << endl; return 1; } signal(SIGHUP, reroute); monitor.iface = argv[1]; // Sniffer configuration SnifferConfiguration config; config.set_promisc_mode(true); config.set_filter("arp"); monitor.makegws(); try { // Sniff on the provided interface in promiscuous mode Sniffer sniffer(argv[1], config); // Only capture arp packets monitor.run(sniffer); } catch (std::exception &ex) { std::cerr << "Error: " << ex.what() << std::endl; } } 

 #!/bin/bash git clone https://github.com/mfontanini/libtins.git cd libtins mkdir build cd build cmake ../ make make install ldconfig 

 g++ main.cpp -o arp-rt -O3 -std=c++11 -lpthread -ltins 

 start-stop-daemon --start --exec /opt/ipoe/arp-routes/arp-rt -b -m -p /opt/ipoe/arp-routes/daemons/eth0.800.pid -- eth0.800 

 start-stop-daemon --start --exec /usr/sbin/ucarp -b -m -p /opt/ipoe/ucarp-gen2/daemons/$iface.$vhid.$virtualaddr.pid -- --interface=eth0.800 --srcip=1.2.3.4 --vhid=1 --pass=carpasword --addr=10.10.10.1 --upscript=/opt/ipoe/ucarp-gen2/up.sh --downscript=/opt/ipoe/ucarp-gen2/down.sh -z -k 10 -P --xparam="10.10.10.0/24" 

 #!/bin/bash iface=$1 addr=$2 gw=$3 vlan=`echo $1 | sed "s/eth0.//"` ip ad ad $addr/32 dev lo ip ro add blackhole $gw echo 1 > /proc/sys/net/ipv4/conf/$iface/proxy_arp killall -9 dhcrelay /etc/init.d/dhcrelay zap /etc/init.d/dhcrelay start killall -HUP arp-rt 

 #!/bin/bash iface=$1 addr=$2 gw=$3 ip ad d $addr/32 dev lo ip ro de blackhole $gw echo 0 > /proc/sys/net/ipv4/conf/$iface/proxy_arp killall -9 dhcrelay /etc/init.d/dhcrelay zap /etc/init.d/dhcrelay start