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Refresh selected source IP when autosense

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This commit is contained in:
Kioubit 2021-12-28 15:42:13 -05:00
parent 95bf95784e
commit 1f294666f3
1 changed files with 33 additions and 23 deletions
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56
pndp/responder.go
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@ -14,7 +14,6 @@ func respond(iface string, requests chan *ndpRequest, respondType ndpType, ndpQu
var ndpQuestionsList = make([]*ndpQuestion, 0, 40) var ndpQuestionsList = make([]*ndpQuestion, 0, 40)
var _, linkLocalSpace, _ = net.ParseCIDR("fe80::/10") var _, linkLocalSpace, _ = net.ParseCIDR("fe80::/10")
var _, ulaSpace, _ = net.ParseCIDR("fc00::/7")
fd, err := syscall.Socket(syscall.AF_INET6, syscall.SOCK_RAW, syscall.IPPROTO_RAW) fd, err := syscall.Socket(syscall.AF_INET6, syscall.SOCK_RAW, syscall.IPPROTO_RAW)
if err != nil { if err != nil {
@ -33,28 +32,7 @@ func respond(iface string, requests chan *ndpRequest, respondType ndpType, ndpQu
panic(err.Error()) panic(err.Error())
} }
var result = emptyIpv6 var result = selectSourceIP(respondIface)
ifaceaddrs, err := respondIface.Addrs()
for _, n := range ifaceaddrs {
tip, _, err := net.ParseCIDR(n.String())
if err != nil {
break
}
var haveUla = false
if isIpv6(tip.String()) {
if tip.IsGlobalUnicast() {
haveUla = true
result = tip
if !ulaSpace.Contains(tip) {
break
}
} else if tip.IsLinkLocalUnicast() && !haveUla {
result = tip
}
}
}
for { for {
var req *ndpRequest var req *ndpRequest
@ -94,6 +72,8 @@ func respond(iface string, requests chan *ndpRequest, respondType ndpType, ndpQu
// Auto-sense // Auto-sense
if autoSense != "" { if autoSense != "" {
//TODO Future work: Use another sub goroutine to monitor the interface instead of checking here
result = selectSourceIP(respondIface)
autoiface, err := net.InterfaceByName(autoSense) autoiface, err := net.InterfaceByName(autoSense)
if err != nil { if err != nil {
panic(err) panic(err)
@ -227,3 +207,33 @@ func cleanupQuestionList(s []*ndpQuestion) []*ndpQuestion {
} }
return s return s
} }
func selectSourceIP(iface *net.Interface) []byte {
var _, ulaSpace, _ = net.ParseCIDR("fc00::/7")
var result = emptyIpv6
ifaceaddrs, err := iface.Addrs()
if err != nil {
return result
}
for _, n := range ifaceaddrs {
tip, _, err := net.ParseCIDR(n.String())
if err != nil {
break
}
var haveUla = false
if isIpv6(tip.String()) {
if tip.IsGlobalUnicast() {
haveUla = true
result = tip
if !ulaSpace.Contains(tip) {
break
}
} else if tip.IsLinkLocalUnicast() && !haveUla {
result = tip
}
}
}
return result
}