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fix: protecting concurrent access to LAN hosts

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This commit is contained in:
evilsocket 2018-02-20 11:33:30 +01:00
commit 241db0cc66
6 changed files with 43 additions and 23 deletions
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41
network/lan.go
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@ -18,8 +18,8 @@ type LAN struct {
Interface *Endpoint
Gateway *Endpoint
Hosts map[string]*Endpoint
hosts map[string]*Endpoint
ttl map[string]uint
aliases *Aliases
newCb EndpointNewCallback
@ -36,7 +36,7 @@ func NewLAN(iface, gateway *Endpoint, newcb EndpointNewCallback, lostcb Endpoint
return &LAN{
Interface: iface,
Gateway: gateway,
Hosts: make(map[string]*Endpoint),
hosts: make(map[string]*Endpoint),
ttl: make(map[string]uint),
aliases: aliases,
newCb: newcb,
@ -49,7 +49,7 @@ func (lan *LAN) SetAliasFor(mac, alias string) bool {
defer lan.Unlock()
mac = NormalizeMac(mac)
if e, found := lan.Hosts[mac]; found {
if e, found := lan.hosts[mac]; found {
lan.aliases.Set(mac, alias)
e.Alias = alias
return true
@ -57,12 +57,22 @@ func (lan *LAN) SetAliasFor(mac, alias string) bool {
return false
}
func (lan *LAN) Get(mac string) (*Endpoint, bool) {
lan.Lock()
defer lan.Unlock()
if e, found := lan.hosts[mac]; found == true {
return e, true
}
return nil, false
}
func (lan *LAN) List() (list []*Endpoint) {
lan.Lock()
defer lan.Unlock()
list = make([]*Endpoint, 0)
for _, t := range lan.Hosts {
for _, t := range lan.hosts {
list = append(list, t)
}
return
@ -86,10 +96,10 @@ func (lan *LAN) Remove(ip, mac string) {
lan.Lock()
defer lan.Unlock()
if e, found := lan.Hosts[mac]; found {
if e, found := lan.hosts[mac]; found {
lan.ttl[mac]--
if lan.ttl[mac] == 0 {
delete(lan.Hosts, mac)
delete(lan.hosts, mac)
delete(lan.ttl, mac)
lan.lostCb(e)
}
@ -123,7 +133,7 @@ func (lan *LAN) Has(ip string) bool {
lan.Lock()
defer lan.Unlock()
for _, e := range lan.Hosts {
for _, e := range lan.hosts {
if e.IpAddress == ip {
return true
}
@ -132,11 +142,20 @@ func (lan *LAN) Has(ip string) bool {
return false
}
func (lan *LAN) Get(ip string) *Endpoint {
func (lan *LAN) EachHost(cb func(mac string, e *Endpoint)) {
lan.Lock()
defer lan.Unlock()
for _, e := range lan.Hosts {
for m, h := range lan.hosts {
cb(m, h)
}
}
func (lan *LAN) GetByIp(ip string) *Endpoint {
lan.Lock()
defer lan.Unlock()
for _, e := range lan.hosts {
if e.IpAddress == ip {
return e
}
@ -153,7 +172,7 @@ func (lan *LAN) AddIfNew(ip, mac string) *Endpoint {
if lan.shouldIgnore(ip, mac) {
return nil
} else if t, found := lan.Hosts[mac]; found {
} else if t, found := lan.hosts[mac]; found {
if lan.ttl[mac] < LANDefaultttl {
lan.ttl[mac]++
}
@ -162,7 +181,7 @@ func (lan *LAN) AddIfNew(ip, mac string) *Endpoint {
e := NewEndpointWithAlias(ip, mac, lan.aliases.Get(mac))
lan.Hosts[mac] = e
lan.hosts[mac] = e
lan.ttl[mac] = LANDefaultttl
lan.newCb(e)