//Opens a pcap handle
func OpenActiveDevice(dev string, snaplen uint32, promisc bool, timeout_ms uint32, filter string) (*Pcap, error) {
var cbuf *C.char
cbuf = (*C.char)(C.calloc(ERRBUF_SIZE, 1))
handle := new(Pcap)
var cpromisc int32 = 0
if promisc {
cpromisc = 1
}
cdev := C.CString(dev)
defer C.free(unsafe.Pointer(cdev))
handle.cptr = C.pcap_open_live(cdev, C.int(snaplen), C.int(cpromisc), C.int(timeout_ms), cbuf)
if handle.cptr == nil {
return nil, errors.New(C.GoString(cbuf))
}
x := C.pcap_datalink(handle.cptr)
handle.linkLayer = uint16(x)
C.free(unsafe.Pointer(cbuf))
if filter != "" {
ret := int32(C.pcap_set_filter(handle.cptr, cdev, C.CString(filter), cbuf, ERRBUF_SIZE-1))
if ret != 0 {
C.free(unsafe.Pointer(handle.cptr))
return nil, errors.New(C.GoString(cbuf))
}
}
return handle, nil
}
// OpenLive opens a device and returns a *Handle.
// It takes as arguments the name of the device ("eth0"), the maximum size to
// read for each packet (snaplen), whether to put the interface in promiscuous
// mode, and a timeout.
//
// See the package documentation for important details regarding 'timeout'.
func OpenLive(device string, snaplen int32, promisc bool, timeout time.Duration) (handle *Handle, _ error) {
buf := (*C.char)(C.calloc(errorBufferSize, 1))
defer C.free(unsafe.Pointer(buf))
var pro C.int
if promisc {
pro = 1
}
p := &Handle{}
p.blockForever = timeout < 0
p.device = device
ifc, err := net.InterfaceByName(device)
if err != nil {
// The device wasn't found in the OS, but could be "any"
// Set index to 0
p.deviceIndex = 0
} else {
p.deviceIndex = ifc.Index
}
dev := C.CString(device)
defer C.free(unsafe.Pointer(dev))
p.cptr = C.pcap_open_live(dev, C.int(snaplen), pro, timeoutMillis(timeout), buf)
if p.cptr == nil {
return nil, errors.New(C.GoString(buf))
}
return p, nil
}
// Open creates a packet capture descriptor to look at packets on the network.
// Calling C.pcap_open_live is the equivalent of calling:
// C.pcap_create
// C.pcap_set_snaplen
// C.pcap_set_promisc
// C.pcap_set_timeout
// C.pcap_activate
//
// In that order. So if you want to use custom values for any thing that has
// to be set before pcap is active you should use Create instead of Open or
// OpenLive.
func (p *Pcap) Open() error {
buf := (*C.char)(C.calloc(C.PCAP_ERRBUF_SIZE, 1))
defer C.free(unsafe.Pointer(buf))
dev := C.CString(p.Device)
defer C.free(unsafe.Pointer(dev))
p.cptr = C.pcap_open_live(dev, C.int(p.Snaplen), C.int(p.Promisc),
C.int(p.Timeout), buf)
if p.cptr == nil {
return errors.New(C.GoString(buf))
}
return nil
}
// OpenLive opens a device and returns a *Handle.
// It takes as arguments the name of the device ("eth0"), the maximum size to
// read for each packet (snaplen), whether to put the interface in promiscuous
// mode, and a timeout.
func OpenLive(device string, snaplen int32, promisc bool, timeout time.Duration) (handle *Handle, _ error) {
var buf *C.char
buf = (*C.char)(C.calloc(errorBufferSize, 1))
defer C.free(unsafe.Pointer(buf))
var pro int32
if promisc {
pro = 1
}
dev := C.CString(device)
defer C.free(unsafe.Pointer(dev))
cptr := C.pcap_open_live(dev, C.int(snaplen), C.int(pro), C.int(timeout/time.Millisecond), buf)
if cptr == nil {
return nil, errors.New(C.GoString(buf))
}
return newHandle(cptr), nil
}
// OpenLive opens a device and returns a *Handle.
// It takes as arguments the name of the device ("eth0"), the maximum size to
// read for each packet (snaplen), whether to put the interface in promiscuous
// mode, and a timeout.
//
// See the package documentation for important details regarding 'timeout'.
func OpenLive(device string, snaplen int32, promisc bool, timeout time.Duration) (handle *Handle, _ error) {
buf := (*C.char)(C.calloc(errorBufferSize, 1))
defer C.free(unsafe.Pointer(buf))
var pro C.int
if promisc {
pro = 1
}
p := &Handle{}
p.blockForever = timeout < 0
p.device = device
dev := C.CString(device)
defer C.free(unsafe.Pointer(dev))
p.cptr = C.pcap_open_live(dev, C.int(snaplen), pro, timeoutMillis(timeout), buf)
if p.cptr == nil {
return nil, errors.New(C.GoString(buf))
}
return p, nil
}
func Openlive(device string, snaplen int32, promisc bool, timeout_ms int32) (handle *Pcap, err string) {
var buf *C.char
buf = (*C.char)(C.calloc(ERRBUF_SIZE, 1))
h := new(Pcap)
var pro int32
if promisc {
pro = 1
} else {
pro = 0
}
h.cptr = C.pcap_open_live(C.CString(device), C.int(snaplen), C.int(pro), C.int(timeout_ms), buf)
if nil == h.cptr {
handle = nil
err = C.GoString(buf)
} else {
handle = h
}
C.free(unsafe.Pointer(buf))
return
}
func Openlive(dev string, snaplen int32, promisc bool, timeout int32) (ret *Pcap, msg string) {
cdev := C.CString(dev)
defer C.free(unsafe.Pointer(cdev))
var cpro C.int
if promisc {
cpro = 1
}
var buf [ERRBUF_SIZE]byte
cbuf := (*C.char)(unsafe.Pointer(&buf[0]))
cptr := C.pcap_open_live(cdev, C.int(snaplen), C.int(cpro), C.int(timeout), cbuf)
clen := C.strlen(cbuf)
msg = string(buf[:clen])
if cptr != nil {
ret = &Pcap{cptr: cptr}
}
return
}
// OpenLive opens a device and returns a handler.
func OpenLive(device string, snaplen int32, promisc bool, timeout_ms int32) (handle *Pcap, err error) {
var buf *C.char
buf = (*C.char)(C.calloc(ERRBUF_SIZE, 1))
h := new(Pcap)
var pro int32
if promisc {
pro = 1
}
dev := C.CString(device)
defer C.free(unsafe.Pointer(dev))
h.cptr = C.pcap_open_live(dev, C.int(snaplen), C.int(pro), C.int(timeout_ms), buf)
if nil == h.cptr {
handle = nil
err = &pcapError{C.GoString(buf)}
} else {
handle = h
}
handle.datalink = handle.Datalink()
C.free(unsafe.Pointer(buf))
return
}
