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addrlist.go
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/
addrlist.go
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package httap
import (
"fmt"
"net"
"reflect"
"strings"
)
type AddrList []*net.TCPAddr
type AddrError struct {
str string
err error
}
func FindInterfaces() (intfsWithAddress []string) {
intfs, err := net.Interfaces()
if err != nil {
return
}
for _, intf := range intfs {
addrs, err := intf.Addrs()
/* VMWare interfaces are not supported by libpcap. */
if err == nil && len(addrs) > 0 && !strings.HasPrefix(intf.Name, "vmnet") {
intfsWithAddress = append(intfsWithAddress, intf.Name)
}
}
return
}
func ResolveAddrList(strs []string) (AddrList, error) {
return resolveAddrListOrPatterns(strs, false)
}
func ResolveAddrPatterns(strs []string) (AddrList, error) {
return resolveAddrListOrPatterns(strs, true)
}
func resolveAddrListOrPatterns(strs []string, expand bool) (addrs AddrList, err error) {
var str string
defer func() {
if r := recover(); r != nil {
err = &AddrError{str, r.(error)}
}
}()
for _, str = range strs {
host, port := splitAddr(str)
if expand && host == "" {
ips, err := net.InterfaceAddrs()
if err != nil {
panic(err)
}
for _, ip := range ips {
addrs = addrs.AddResolved(ip.(*net.IPNet).IP.String(), port)
}
} else {
addrs = addrs.AddResolved(host, port)
}
}
return
}
func (addrs AddrList) AddResolved(host, port string) AddrList {
resolved, err := net.ResolveTCPAddr("tcp", net.JoinHostPort(host, port))
if err != nil {
panic(err)
}
for _, item := range addrs {
if reflect.DeepEqual(resolved, item) {
return addrs
}
}
return append(addrs, resolved)
}
func (addrs AddrList) String() string {
var ipv4Addrs, ipv6Addrs []string
for _, addr := range addrs {
if p4 := addr.IP.To4(); len(p4) == net.IPv4len {
ipv4Addrs = append(ipv4Addrs, addr.String())
} else {
ipv6Addrs = append(ipv6Addrs, addr.String())
}
}
return strings.Join(append(ipv4Addrs, ipv6Addrs...), ", ")
}
func (addrs AddrList) Filter() string {
var parts []string
for _, addr := range addrs {
parts = append(parts, fmt.Sprintf("(dst host %s and tcp dst port %d)", addr.IP, addr.Port))
}
return strings.Join(parts, " or ")
}
func (addrs AddrList) RequiresPromisc() bool {
ips, err := net.InterfaceAddrs()
if err != nil {
return true
}
Addrs:
for _, addr := range addrs {
for _, ip := range ips {
if reflect.DeepEqual(addr.IP, ip.(*net.IPNet).IP) {
continue Addrs
}
}
return true
}
return false
}
func (e *AddrError) Error() string {
return fmt.Sprintf("cannot resolve %s (%s)", e.str, e.err)
}
func splitAddr(addr string) (string, string) {
if !hasPort(addr) {
addr = addr + ":80"
}
host, port, err := net.SplitHostPort(addr)
if err != nil {
panic(err)
}
if host == "*" {
host = ""
}
return host, port
}
func hasPort(addr string) bool {
return strings.LastIndex(addr, ":") > strings.LastIndex(addr, "]")
}