本文整理汇总了Golang中github.com/google/gopacket/layers.IPv4.IHL方法的典型用法代码示例。如果您正苦于以下问题：Golang IPv4.IHL方法的具体用法？Golang IPv4.IHL怎么用？Golang IPv4.IHL使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类github.com/google/gopacket/layers.IPv4的用法示例。
在下文中一共展示了IPv4.IHL方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: setSiffFields
/* Adds the SIFF header to a packet, or modifies it in the case that it already
exists. Pass in the NFPacket, the flags (bitwise OR them if you need both), and
the capabilities and capability updates arrays. If only IsSiff is set, just fill
the last 4 bytes with dummy data, it'll be ignored. If you want to update specific
fields, then use the [update function name here] function */
func setSiffFields(packet *netfilter.NFPacket, flags uint8, capabilities []byte, updoots []byte) {
var ipLayer *layers.IPv4
var option [1]layers.IPv4Option
option[0].OptionType = 86
option[0].OptionLength = 8
/* Get the IPv4 layer, and if it doesn't exist, keep doing shit
I can't be arsed for proper response outside the bounds of this project */
if layer := packet.Packet.Layer(layers.LayerTypeIPv4); layer != nil {
ipLayer = layer.(*layers.IPv4)
} else {
// maybe do something?
}
/* Modify the ip layer information */
var IHLchange uint16 = uint16(ipLayer.IHL)
// compute new IHL and length
if (flags & CapabilityUpdate) == CapabilityUpdate {
ipLayer.IHL = 8
option[0].OptionLength = 12
} else if (flags&IsSiff) == IsSiff || (flags&Exp) == Exp {
ipLayer.IHL = 7
} else {
ipLayer.IHL = 5
}
IHLchange = uint16(ipLayer.IHL) - IHLchange
if IHLchange != 0 {
ipLayer.Length += IHLchange * 4
}
if (flags & Evil) == Evil {
// set the evil flag. If we do this, we don't need to do anything else,
// since evil packets are legacy, and don't have other flags
ipLayer.Flags |= layers.IPv4EvilBit
} else {
// set the flags option
option[0].OptionData = []byte{0, 0}
if (flags & Exp) == Exp {
option[0].OptionData[0] = byte(Exp)
}
if (flags & CapabilityUpdate) == CapabilityUpdate {
option[0].OptionData[0] |= byte(IsSiff | CapabilityUpdate)
} else if (flags & IsSiff) == IsSiff {
option[0].OptionData[0] |= byte(IsSiff)
}
// handle the options
if flags != 0 {
for _, b := range capabilities {
option[0].OptionData = append(option[0].OptionData, b)
}
}
if (flags & CapabilityUpdate) == CapabilityUpdate {
for _, b := range updoots {
option[0].OptionData = append(option[0].OptionData, b)
}
}
// add options
if flags != 0 {
ipLayer.Options = append([]layers.IPv4Option{option[0]}, ipLayer.Options...)
}
}
// we're done
}