diff options
Diffstat (limited to 'vendor/github.com/vishvananda/netlink/nl/parse_attr_linux.go')
-rw-r--r-- | vendor/github.com/vishvananda/netlink/nl/parse_attr_linux.go | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/vendor/github.com/vishvananda/netlink/nl/parse_attr_linux.go b/vendor/github.com/vishvananda/netlink/nl/parse_attr_linux.go new file mode 100644 index 000000000..7f49125cf --- /dev/null +++ b/vendor/github.com/vishvananda/netlink/nl/parse_attr_linux.go @@ -0,0 +1,79 @@ +package nl + +import ( + "encoding/binary" + "fmt" + "log" +) + +type Attribute struct { + Type uint16 + Value []byte +} + +func ParseAttributes(data []byte) <-chan Attribute { + native := NativeEndian() + result := make(chan Attribute) + + go func() { + i := 0 + for i+4 < len(data) { + length := int(native.Uint16(data[i : i+2])) + attrType := native.Uint16(data[i+2 : i+4]) + + if length < 4 { + log.Printf("attribute 0x%02x has invalid length of %d bytes", attrType, length) + break + } + + if len(data) < i+length { + log.Printf("attribute 0x%02x of length %d is truncated, only %d bytes remaining", attrType, length, len(data)-i) + break + } + + result <- Attribute{ + Type: attrType, + Value: data[i+4 : i+length], + } + i += rtaAlignOf(length) + } + close(result) + }() + + return result +} + +func PrintAttributes(data []byte) { + printAttributes(data, 0) +} + +func printAttributes(data []byte, level int) { + for attr := range ParseAttributes(data) { + for i := 0; i < level; i++ { + print("> ") + } + nested := attr.Type&NLA_F_NESTED != 0 + fmt.Printf("type=%d nested=%v len=%v %v\n", attr.Type&NLA_TYPE_MASK, nested, len(attr.Value), attr.Value) + if nested { + printAttributes(attr.Value, level+1) + } + } +} + +// Uint32 returns the uint32 value respecting the NET_BYTEORDER flag +func (attr *Attribute) Uint32() uint32 { + if attr.Type&NLA_F_NET_BYTEORDER != 0 { + return binary.BigEndian.Uint32(attr.Value) + } else { + return NativeEndian().Uint32(attr.Value) + } +} + +// Uint64 returns the uint64 value respecting the NET_BYTEORDER flag +func (attr *Attribute) Uint64() uint64 { + if attr.Type&NLA_F_NET_BYTEORDER != 0 { + return binary.BigEndian.Uint64(attr.Value) + } else { + return NativeEndian().Uint64(attr.Value) + } +} |