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use super::*; extern crate byteorder; use std::{io, marker}; /// Helper for building packets. /// /// The packet builder allows the easy construction of a packet from the /// ethernet II layer downwards including ipv6, ipv4, the udp header and the /// actual payload. The packet builder automatically calculates lengths & checksums /// for ip & udp and set type identifiers for ethernetII and ip. This makes it /// easy and less error prone to construct custom packets. /// /// # Example: /// /// Generating a packet that starts with an Ethernet II header: /// /// ``` /// use etherparse::PacketBuilder; /// /// let builder = PacketBuilder:: /// ethernet2([1,2,3,4,5,6], //source mac /// [7,8,9,10,11,12]) //destionation mac /// .ipv4([192,168,1,1], //source ip /// [192,168,1,2], //desitionation ip /// 20) //time to life /// .udp(21, //source port /// 1234); //desitnation port /// /// //payload of the udp packet /// let payload = [1,2,3,4,5,6,7,8]; /// /// //get some memory to store the result /// let mut result = Vec::<u8>::with_capacity( /// builder.size(payload.len())); /// /// //serialize /// builder.write(&mut result, &payload).unwrap(); /// println!("{:?}", result); /// ``` pub struct PacketBuilder {} impl PacketBuilder { /// Start an packet with an ethernetII header. /// /// # Example /// /// Basic usage: /// /// ``` /// # use etherparse::PacketBuilder; /// # /// let builder = PacketBuilder:: /// ethernet2([1,2,3,4,5,6], //source mac /// [7,8,9,10,11,12]) //destionation mac /// .ipv4([192,168,1,1], //source ip /// [192,168,1,2], //desitionation ip /// 20) //time to life /// .udp(21, //source port /// 1234); //desitnation port /// /// //payload of the udp packet /// let payload = [1,2,3,4,5,6,7,8]; /// /// //get some memory to store the result /// let mut result = Vec::<u8>::with_capacity( /// builder.size(payload.len())); /// /// //serialize /// builder.write(&mut result, &payload).unwrap(); /// ``` pub fn ethernet2(source: [u8;6], destination: [u8;6]) -> PacketBuilderStep<Ethernet2Header> { PacketBuilderStep { state: PacketImpl { ethernet2_header: Some(Ethernet2Header{ source, destination, ether_type: 0 //the type identifier }), vlan_header: None, ip_header: None, transport_header: None }, _marker: marker::PhantomData::<Ethernet2Header>{} } } ///Starts a packet with an IPv4 header. /// /// # Example /// /// Basic usage: /// /// ``` /// # use etherparse::PacketBuilder; /// # /// let builder = PacketBuilder:: /// ipv4([192,168,1,1], //source ip /// [192,168,1,2], //desitionation ip /// 20) //time to life /// .udp(21, //source port /// 1234); //desitnation port /// /// //payload of the udp packet /// let payload = [1,2,3,4,5,6,7,8]; /// /// //get some memory to store the result /// let mut result = Vec::<u8>::with_capacity( /// builder.size(payload.len())); /// /// //serialize /// builder.write(&mut result, &payload).unwrap(); /// ``` pub fn ipv4(source: [u8;4], destination: [u8;4], time_to_live: u8) -> PacketBuilderStep<IpHeader> { PacketBuilderStep { state: PacketImpl { ethernet2_header: None, vlan_header: None, ip_header: None, transport_header: None }, _marker: marker::PhantomData::<Ethernet2Header>{} }.ipv4(source, destination, time_to_live) } ///Start a packet with an IPv6 header. /// /// # Example /// /// Basic usage: /// /// ``` /// # use etherparse::PacketBuilder; /// # /// let builder = PacketBuilder:: /// ipv6( /// //source /// [11,12,13,14,15,16,17,18,19,10,21,22,23,24,25,26], /// //destination /// [31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46], /// //hop_limit /// 47) /// .udp(21, //source port /// 1234); //desitnation port /// /// //payload of the udp packet /// let payload = [1,2,3,4,5,6,7,8]; /// /// //get some memory to store the result /// let mut result = Vec::<u8>::with_capacity( /// builder.size(payload.len())); /// /// //serialize /// builder.write(&mut result, &payload).unwrap(); /// ``` pub fn ipv6(source: [u8;16], destination: [u8;16], hop_limit: u8) -> PacketBuilderStep<IpHeader> { PacketBuilderStep { state: PacketImpl { ethernet2_header: None, vlan_header: None, ip_header: None, transport_header: None }, _marker: marker::PhantomData::<Ethernet2Header>{} }.ipv6(source, destination, hop_limit) } ///Starts a packet with an arbitrary ip header (length, protocol/next_header & checksum fields will be overwritten based on the rest of the packet). /// /// # Examples /// /// With an IPv4 header: /// /// ``` /// # use etherparse::*; /// # /// let builder = PacketBuilder:: /// //payload_len, protocol & checksum will be replaced during write /// ip(IpHeader::Version4(Ipv4Header::new( /// 0, //payload_len will be replaced during write /// 12, //time_to_live /// IpTrafficClass::Udp, //will be replaced during write /// [0,1,2,3], //source /// [4,5,6,7] //destination /// ))) /// .udp(21, //source port /// 1234); //desitnation port /// /// //payload of the udp packet /// let payload = [1,2,3,4,5,6,7,8]; /// /// //get some memory to store the result /// let mut result = Vec::<u8>::with_capacity( /// builder.size(payload.len())); /// /// //serialize /// builder.write(&mut result, &payload).unwrap(); /// ``` /// /// With an IPv6 header: /// /// ``` /// # use etherparse::*; /// # /// let builder = PacketBuilder:: /// ip(IpHeader::Version6(Ipv6Header{ /// traffic_class: 0, /// flow_label: 0, /// payload_length: 0, //will be replaced during write /// next_header: 0, //will be replaced during write /// hop_limit: 4, /// source: [0;16], /// destination: [0;16] /// })) /// .udp(21, //source port /// 1234); //desitnation port /// /// //payload of the udp packet /// let payload = [1,2,3,4,5,6,7,8]; /// /// //get some memory to store the result /// let mut result = Vec::<u8>::with_capacity( /// builder.size(payload.len())); /// /// //serialize /// builder.write(&mut result, &payload).unwrap(); /// ``` pub fn ip(ip_header: IpHeader) -> PacketBuilderStep<IpHeader> { PacketBuilderStep { state: PacketImpl { ethernet2_header: None, vlan_header: None, ip_header: None, transport_header: None }, _marker: marker::PhantomData::<Ethernet2Header>{} }.ip(ip_header) } } struct PacketImpl { ethernet2_header: Option<Ethernet2Header>, ip_header: Option<IpHeader>, vlan_header: Option<VlanHeader>, transport_header: Option<TransportHeader> } ///An unfinished packet that is build with the packet builder pub struct PacketBuilderStep<LastStep> { state: PacketImpl, _marker: marker::PhantomData<LastStep> } impl PacketBuilderStep<Ethernet2Header> { ///Add an ip v4 header pub fn ipv4(mut self, source: [u8;4], destination: [u8;4], time_to_live: u8) -> PacketBuilderStep<IpHeader> { //add ip header self.state.ip_header = Some(IpHeader::Version4({ let mut value: Ipv4Header = Default::default(); value.source = source; value.destination = destination; value.time_to_live = time_to_live; value })); //return for next step PacketBuilderStep { state: self.state, _marker: marker::PhantomData::<IpHeader>{} } } ///Add an ip header (length, protocol/next_header & checksum fields will be overwritten based on the rest of the packet). /// /// # Examples /// /// With an IPv4 header: /// /// ``` /// # use etherparse::*; /// # /// let builder = PacketBuilder:: /// ethernet2([1,2,3,4,5,6], /// [7,8,9,10,11,12]) /// //payload_len, protocol & checksum will be replaced during write /// .ip(IpHeader::Version4(Ipv4Header::new( /// 0, //payload_len will be replaced during write /// 12, //time_to_live /// IpTrafficClass::Udp, //will be replaced during write /// [0,1,2,3], //source /// [4,5,6,7] //destination /// ))); /// ``` /// /// With an IPv6 header: /// /// ``` /// # use etherparse::*; /// # /// let builder = PacketBuilder:: /// ethernet2([1,2,3,4,5,6], /// [7,8,9,10,11,12]) /// .ip(IpHeader::Version6(Ipv6Header{ /// traffic_class: 0, /// flow_label: 0, /// payload_length: 0, //will be replaced during write /// next_header: 0, //will be replaced during write /// hop_limit: 4, /// source: [0;16], /// destination: [0;16] /// })); /// ``` pub fn ip(mut self, ip_header: IpHeader) -> PacketBuilderStep<IpHeader> { //add ip header self.state.ip_header = Some(ip_header); //return for next step PacketBuilderStep { state: self.state, _marker: marker::PhantomData::<IpHeader>{} } } ///Add an ip v6 header pub fn ipv6(mut self, source: [u8;16], destination: [u8;16], hop_limit: u8) -> PacketBuilderStep<IpHeader> { self.state.ip_header = Some(IpHeader::Version6(Ipv6Header{ traffic_class: 0, flow_label: 0, payload_length: 0, //filled in on write next_header: 0, //filled in on write hop_limit, source, destination })); //return for next step PacketBuilderStep { state: self.state, _marker: marker::PhantomData::<IpHeader>{} } } ///Adds a vlan tagging header with the given vlan identifier pub fn vlan(mut self, vlan: VlanHeader) -> PacketBuilderStep<VlanHeader> { self.state.vlan_header = Some(vlan); //return for next step PacketBuilderStep { state: self.state, _marker: marker::PhantomData::<VlanHeader>{} } } ///Adds a vlan tagging header with the given vlan identifier pub fn single_vlan(mut self, vlan_identifier: u16) -> PacketBuilderStep<VlanHeader> { self.state.vlan_header = Some(VlanHeader::Single(SingleVlanHeader { priority_code_point: 0, drop_eligible_indicator: false, vlan_identifier, ether_type: 0, //will be set automatically during write })); //return for next step PacketBuilderStep { state: self.state, _marker: marker::PhantomData::<VlanHeader>{} } } ///Adds two vlan tagging header with the given vlan identifiers (also known as double vlan tagging). pub fn double_vlan(mut self, outer_vlan_identifier: u16, inner_vlan_identifier: u16) -> PacketBuilderStep<VlanHeader> { self.state.vlan_header = Some(VlanHeader::Double(DoubleVlanHeader { outer: SingleVlanHeader { priority_code_point: 0, drop_eligible_indicator: false, vlan_identifier: outer_vlan_identifier, ether_type: 0, //will be set automatically during write }, inner: SingleVlanHeader { priority_code_point: 0, drop_eligible_indicator: false, vlan_identifier: inner_vlan_identifier, ether_type: 0, //will be set automatically during write } })); //return for next step PacketBuilderStep { state: self.state, _marker: marker::PhantomData::<VlanHeader>{} } } } impl PacketBuilderStep<VlanHeader> { ///Add an ip header (length, protocol/next_header & checksum fields will be overwritten based on the rest of the packet). /// /// # Example IPv4 /// ``` /// # use etherparse::*; /// # /// let builder = PacketBuilder:: /// ethernet2([1,2,3,4,5,6], /// [7,8,9,10,11,12]) /// //payload_len, protocol & checksum will be replaced during write /// .ip(IpHeader::Version4(Ipv4Header::new( /// 0, //payload_len will be replaced during write /// 12, //time_to_live /// IpTrafficClass::Udp, //will be replaced during write /// [0,1,2,3], //source /// [4,5,6,7] //destination /// ))); /// ``` /// /// # Example IPv6 /// ``` /// # use etherparse::*; /// # /// let builder = PacketBuilder:: /// ethernet2([1,2,3,4,5,6], /// [7,8,9,10,11,12]) /// .ip(IpHeader::Version6(Ipv6Header{ /// traffic_class: 0, /// flow_label: 0, /// payload_length: 0, //will be replaced during write /// next_header: 0, //will be replaced during write /// hop_limit: 4, /// source: [0;16], /// destination: [0;16] /// })); /// ``` pub fn ip(self, ip_header: IpHeader) -> PacketBuilderStep<IpHeader> { //use the method from the Ethernet2Header implementation PacketBuilderStep { state: self.state, _marker: marker::PhantomData::<Ethernet2Header>{} }.ip(ip_header) } ///Add a ip v6 header pub fn ipv6(self, source: [u8;16], destination: [u8;16], hop_limit: u8) -> PacketBuilderStep<IpHeader> { //use the method from the Ethernet2Header implementation PacketBuilderStep { state: self.state, _marker: marker::PhantomData::<Ethernet2Header>{} }.ipv6(source, destination, hop_limit) } ///Add a ip v4 header pub fn ipv4(self, source: [u8;4], destination: [u8;4], time_to_live: u8) -> PacketBuilderStep<IpHeader> { //use the method from the Ethernet2Header implementation PacketBuilderStep { state: self.state, _marker: marker::PhantomData::<Ethernet2Header>{} }.ipv4(source, destination, time_to_live) } } impl PacketBuilderStep<IpHeader> { pub fn udp(mut self, source_port: u16, destination_port: u16) -> PacketBuilderStep<UdpHeader> { self.state.transport_header = Some(TransportHeader::Udp(UdpHeader{ source_port, destination_port, length: 0, //calculated later checksum: 0 //calculated later })); //return for next step PacketBuilderStep { state: self.state, _marker: marker::PhantomData::<UdpHeader>{} } } pub fn tcp(mut self, source_port: u16, destination_port: u16, sequence_number: u32, window_size: u16) -> PacketBuilderStep<TcpHeader> { self.state.transport_header = Some(TransportHeader::Tcp( TcpHeader::new(source_port, destination_port, sequence_number, window_size) )); //return for next step PacketBuilderStep { state: self.state, _marker: marker::PhantomData::<TcpHeader>{} } } } impl PacketBuilderStep<UdpHeader> { ///Write all the headers and the payload. pub fn write<T: io::Write + Sized>(self, writer: &mut T, payload: &[u8]) -> Result<(),WriteError> { final_write(self, writer, payload) } ///Returns the size of the packet when it is serialized pub fn size(&self, payload_size: usize) -> usize { final_size(&self, payload_size) } } impl PacketBuilderStep<TcpHeader> { ///Set ns flag (ECN-nonce - concealment protection; experimental: see RFC 3540) pub fn ns(mut self) -> PacketBuilderStep<TcpHeader> { self.state.transport_header.as_mut().unwrap().mut_tcp().unwrap().ns = true; self } ///Set fin flag (No more data from sender) pub fn fin(mut self) -> PacketBuilderStep<TcpHeader> { self.state.transport_header.as_mut().unwrap().mut_tcp().unwrap().fin = true; self } ///Set the syn flag (synchronize sequence numbers) pub fn syn(mut self) -> PacketBuilderStep<TcpHeader> { self.state.transport_header.as_mut().unwrap().mut_tcp().unwrap().syn = true; self } ///Sets the rst flag (reset the connection) pub fn rst(mut self) -> PacketBuilderStep<TcpHeader> { self.state.transport_header.as_mut().unwrap().mut_tcp().unwrap().rst = true; self } ///Sets the psh flag (push function) pub fn psh(mut self) -> PacketBuilderStep<TcpHeader> { self.state.transport_header.as_mut().unwrap().mut_tcp().unwrap().psh = true; self } ///Sets the ack flag and the acknowledgment_number. pub fn ack(mut self, acknowledgment_number: u32) -> PacketBuilderStep<TcpHeader> { { let header = self.state.transport_header.as_mut().unwrap().mut_tcp().unwrap(); header.ack = true; header.acknowledgment_number = acknowledgment_number; } self } ///Set the urg flag & the urgent pointer field. /// ///The urgent pointer points to the sequence number of the octet following ///the urgent data. pub fn urg(mut self, urgent_pointer: u16) -> PacketBuilderStep<TcpHeader> { { let header = self.state.transport_header.as_mut().unwrap().mut_tcp().unwrap(); header.urg = true; header.urgent_pointer = urgent_pointer; } self } ///Sets ece flag (ECN-Echo, RFC 3168) pub fn ece(mut self) -> PacketBuilderStep<TcpHeader> { self.state.transport_header.as_mut().unwrap().mut_tcp().unwrap().ece = true; self } ///Set cwr flag (Congestion Window Reduced) /// ///This flag is set by the sending host to indicate that it received a TCP segment with the ECE flag set and had responded in congestion control mechanism (added to header by RFC 3168). pub fn cwr(mut self) -> PacketBuilderStep<TcpHeader> { self.state.transport_header.as_mut().unwrap().mut_tcp().unwrap().cwr = true; self } ///Set the tcp options of the header. pub fn options(mut self, options: &[TcpOptionElement]) -> Result<PacketBuilderStep<TcpHeader>, TcpOptionWriteError> { self.state.transport_header.as_mut().unwrap().mut_tcp().unwrap().set_options(options)?; Ok(self) } ///Set the tcp options of the header (setting the bytes directly). pub fn options_raw(mut self, options: &[u8]) -> Result<PacketBuilderStep<TcpHeader>, TcpOptionWriteError> { self.state.transport_header.as_mut().unwrap().mut_tcp().unwrap().set_options_raw(options)?; Ok(self) } ///Write all the headers and the payload. pub fn write<T: io::Write + Sized>(self, writer: &mut T, payload: &[u8]) -> Result<(),WriteError> { final_write(self, writer, payload) } ///Returns the size of the packet when it is serialized pub fn size(&self, payload_size: usize) -> usize { final_size(&self, payload_size) } } ///Write all the headers and the payload. fn final_write<T: io::Write + Sized, B>(builder: PacketBuilderStep<B>, writer: &mut T, payload: &[u8]) -> Result<(),WriteError> { let ip_ether_type = { use crate::IpHeader::*; match builder.state.ip_header { Some(Version4(_)) => EtherType::Ipv4 as u16, Some(Version6(_)) => EtherType::Ipv6 as u16, None => panic!("Missing ip header") } }; //ethernetII header if let Some(mut eth) = builder.state.ethernet2_header { eth.ether_type = { use crate::VlanHeader::*; //determine the ether type depending on if there is a vlan tagging header match builder.state.vlan_header { Some(Single(_)) => EtherType::VlanTaggedFrame as u16, Some(Double(_)) => EtherType::ProviderBridging as u16, //if no vlan header exists, the id is purely defined by the ip type None => ip_ether_type } }; eth.write(writer)?; } //write the vlan header if it exists use crate::VlanHeader::*; match builder.state.vlan_header { Some(Single(mut value)) => { //set ether types value.ether_type = ip_ether_type; //serialize value.write(writer)?; }, Some(Double(mut value)) => { //set ether types value.outer.ether_type = EtherType::VlanTaggedFrame as u16; value.inner.ether_type = ip_ether_type; //serialize value.write(writer)?; }, None => {} } //unpack the transport header let mut transport = builder.state.transport_header.unwrap(); //ip header use crate::IpHeader::*; let ip_header = builder.state.ip_header.unwrap(); match ip_header { Version4(mut ip) => { //set total length & udp payload length (ip checks that the payload length is ok) let size = transport.header_len() + payload.len(); ip.set_payload_len(size)?; use crate::TransportHeader::*; match transport { Udp(ref mut udp) => { udp.length = size as u16; } Tcp(_) => {} } //traffic class ip.protocol = match transport { Udp(_) => IpTrafficClass::Udp as u8, Tcp(_) => IpTrafficClass::Tcp as u8 }; //calculate the udp checksum transport.update_checksum_ipv4(&ip, payload)?; //write (will automatically calculate the checksum) ip.write(writer)? }, Version6(mut ip) => { //set total length let size = transport.header_len() + payload.len(); ip.set_payload_length(size)?; use crate::TransportHeader::*; match transport { Udp(ref mut udp) => { udp.length = size as u16; } Tcp(_) => {} } //set the protocol ip.next_header = match transport { Udp(_) => IpTrafficClass::Udp as u8, Tcp(_) => IpTrafficClass::Tcp as u8 }; //calculate the udp checksum transport.update_checksum_ipv6(&ip, payload)?; //write (will automatically calculate the checksum) ip.write(writer)? } } //finaly write the udp header & payload transport.write(writer)?; writer.write_all(payload)?; Ok(()) } ///Returns the size of the packet when it is serialized fn final_size<B>(builder: &PacketBuilderStep<B>, payload_size: usize) -> usize { use crate::IpHeader::*; use crate::VlanHeader::*; use crate::TransportHeader::*; (match builder.state.ethernet2_header { Some(_) => Ethernet2Header::SERIALIZED_SIZE, None => 0 }) + match builder.state.vlan_header { Some(Single(_)) => SingleVlanHeader::SERIALIZED_SIZE, Some(Double(_)) => DoubleVlanHeader::SERIALIZED_SIZE, None => 0 } + match builder.state.ip_header { Some(Version4(ref value)) => value.header_len(), Some(Version6(_)) => Ipv6Header::SERIALIZED_SIZE, None => 0 } + match builder.state.transport_header { Some(Udp(_)) => UdpHeader::SERIALIZED_SIZE, Some(Tcp(ref value)) => value.header_len() as usize, None => 0 } + payload_size } #[cfg(test)] mod whitebox_tests { //whitebox tests that need internal access #[test] fn size() { use super::*; assert_eq!(0, PacketBuilderStep::<UdpHeader> { state: PacketImpl { ethernet2_header: None, ip_header: None, vlan_header: None, transport_header: None }, _marker: marker::PhantomData::<UdpHeader>{} }.size(0)); } }