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syscall: skip routing messages with mismatched version

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Skip routing messages with a mismatched version, rather than failing
and returning EINVAL. Only return EINVAL if we were unable to parse
any of the routing messages (presumably due to a version mismatch).

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/30340043
This commit is contained in:
Joel Sing 2013-12-11 00:03:46 +11:00
parent c8869e9caf
commit 517e49eb29
1 changed files with 8 additions and 1 deletions
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9
src/pkg/syscall/route_bsd.go
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@ -199,14 +199,21 @@ func (m *InterfaceAddrMessage) sockaddr() (sas []Sockaddr) {
// ParseRoutingMessage parses b as routing messages and returns the
// slice containing the RoutingMessage interfaces.
func ParseRoutingMessage(b []byte) (msgs []RoutingMessage, err error) {
msgCount := 0
for len(b) >= anyMessageLen {
msgCount++
any := (*anyMessage)(unsafe.Pointer(&b[0]))
if any.Version != RTM_VERSION {
return nil, EINVAL
b = b[any.Msglen:]
continue
}
msgs = append(msgs, any.toRoutingMessage(b))
b = b[any.Msglen:]
}
// We failed to parse any of the messages - version mismatch?
if msgCount > 0 && len(msgs) == 0 {
return nil, EINVAL
}
return msgs, nil
}