本文整理匯總了Golang中github.com/google/gopacket/layers.IPv4.Options方法的典型用法代碼示例。如果您正苦於以下問題：Golang IPv4.Options方法的具體用法？Golang IPv4.Options怎麽用？Golang IPv4.Options使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類github.com/google/gopacket/layers.IPv4的用法示例。
在下文中一共展示了IPv4.Options方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Golang代碼示例。
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
}