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interfaces.go
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interfaces.go
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package main
import (
"net"
"time"
"crypto/sha256"
"encoding/binary"
log "github.com/sirupsen/logrus"
)
func SetupInterfaces(sessionID SessionID, serverAddr string) error {
defer func() {
log.WithField("sess-id", sessionID).Warning("Killing SetupInterfaces because scan failed")
getSession(sessionID).kill() // when the scan is over, the session is over
}()
for {
if !hasSession(sessionID) {
log.WithField("sess-id", sessionID).Debug("Stopping scan because session does not exist")
return nil
}
ifaces, ifaceErr := net.Interfaces()
if ifaceErr != nil {
log.WithError(ifaceErr).Error("Stopping scan because iface err")
return ifaceErr
}
tcpServerAddr, tcpServerErr := net.ResolveTCPAddr("tcp", serverAddr)
if tcpServerErr != nil {
log.WithError(tcpServerErr).Error("Stopping scan because server err")
return tcpServerErr
}
////var udpServerAddr *net.UDPAddr
//var udpServerErr error
//if len(*flagUDPInterfaces) > 0 {
// udpServerAddr, udpServerErr = net.ResolveUDPAddr("udp", serverAddr)
// if udpServerErr != nil {
// return udpServerErr
// }
//}
session := getSession(sessionID)
for _, iface := range ifaces {
if len(flagInterfaces.contents) > 0 {
_, ok := flagInterfaces.contents[iface.Name]
if !ok {
break
}
}
connErr := startConnectionFromIface(session, iface, tcpServerAddr)
if connErr != nil {
return connErr
}
}
time.Sleep(time.Second * time.Duration(flagIfacePoll))
}
}
func startConnectionFromIface(session *Session, iface net.Interface, tcpServerAddr *net.TCPAddr) error {
session.lock.Lock()
for _, conn := range session.conns {
if iface.Name == conn.GetInterfaceName() {
session.lock.Unlock()
return nil
}
}
session.lock.Unlock()
addrs, addrErr := iface.Addrs()
if addrErr != nil {
log.WithError(addrErr).Error("Stopping scan because addr err")
return addrErr
}
connection := buildConnectionFromAddrs(addrs, tcpServerAddr, iface, session.sessionID)
if connection == nil {
return nil
}
return nil
}
func buildConnectionFromAddrs(addrs []net.Addr, tcpServerAddr *net.TCPAddr, iface net.Interface, id SessionID) *Connection {
for _, addr := range addrs {
log.WithFields(log.Fields{
"iface": iface.Name,
"addr": addr,
}).Debug("Attempting connection")
ip, _, ipErr := net.ParseCIDR(addr.String())
if ipErr != nil {
log.WithError(ipErr).Error("Could not parse CIDR")
continue
}
if ip.IsLinkLocalMulticast() {
continue
}
tcpLocalAddr, localErr := net.ResolveTCPAddr("tcp", ip.String()+":0")
if localErr != nil {
log.WithError(localErr).Warning("Could not resolve tcp address")
continue
}
log.WithField("local-addr", tcpLocalAddr).Debug("Dialing TCP conn...")
conn, err := net.DialTCP("tcp", tcpLocalAddr, tcpServerAddr)
if err != nil {
log.Error("TCP Dial error", err)
continue
}
if iface.Name == "" {
log.Error("Empty interface name")
continue
}
interimID := sha256.Sum256([]byte(iface.Name))
ifaceID := binary.BigEndian.Uint64(interimID[:8])
connection := &Connection{
iface: iface.Name,
ifaceID: ifaceID,
conn: conn,
}
connErr := ClientCreateServerConnection(connection, id)
if connErr != nil {
log.WithFields(log.Fields{
"conn": connection,
"sess-id": id,
}).WithError(connErr).Error("Could not create conn...")
continue
}
return connection
}
return nil
}