mirror of
https://github.com/pavel-odintsov/fastnetmon
synced 2024-05-27 08:56:19 +02:00
637 lines
21 KiB
C++
637 lines
21 KiB
C++
#pragma once
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#include <bitset>
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#include <cstdint>
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#include <iomanip>
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#include <iostream>
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#include <sstream>
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#include "fast_endianless.hpp"
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#include "iana_ethertypes.hpp"
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#include "iana_ip_protocols.hpp"
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// Get rid of this include and replace ntohs, ntohl by fast_endianless logic calls
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#ifdef _WIN32
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#include <winsock2.h>
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#else
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#include <arpa/inet.h>
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#endif
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// This function could copy X bytes from src to dst.
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// Where X - size of dst object (referenced by pointer)
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template <typename dst_type, typename src_type> inline void* smart_memcpy(dst_type* dst, const src_type* src) {
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return memcpy(dst, src, sizeof(dst_type));
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}
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namespace network_data_stuctures {
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/* We are using this structure as pretty interface for IPv4 address bytes in
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* host byte order (little
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* endian) */
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struct __attribute__((__packed__)) ipv4_octets_form_little_endian_t {
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uint8_t fourth = 0;
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uint8_t third = 0;
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uint8_t second = 0;
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uint8_t first = 0;
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};
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// Convert IP as integer to string representation
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inline std::string convert_ip_as_little_endian_to_string(uint32_t ip) {
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/*
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Actually we could use inet_ntoa but it's implementation uses not very
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convenient data
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structures (struct in_addr)
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Also it has multi thread issues (because it's using common buffer) and it
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solved by thread
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local storage.
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Which could produce performance issues too (chec http://www.agner.org)
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Here you could
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https://github.com/bminor/glibc/blob/0a1f1e78fbdfaf2c01e9c2368023b2533e7136cf/inet/inet_ntoa.c#L31
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And has known performance issues: https://github.com/h2o/qrintf
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I decided to implement it manually
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*/
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const size_t max_ip_as_string_size = 16; // Maximum string length as integer
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char buffer[max_ip_as_string_size];
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ipv4_octets_form_little_endian_t* ipv4_octets = (ipv4_octets_form_little_endian_t*)&ip;
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snprintf(buffer, max_ip_as_string_size, "%d.%d.%d.%d", ipv4_octets->first, ipv4_octets->second, ipv4_octets->third,
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ipv4_octets->fourth);
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return std::string(buffer);
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}
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// Here we are using very cryptic form of pointer to fixed size array
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inline std::string convert_mac_to_string(uint8_t (&mac_as_array)[6]) {
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std::stringstream buffer;
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for (int i = 0; i < 6; i++) {
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buffer << std::hex << std::setfill('0') << std::setw(2) << int(mac_as_array[i]);
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if (i != 5) {
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buffer << ":";
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}
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}
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return buffer.str();
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}
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// TODO: it's not finished yet
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class __attribute__((__packed__)) mpls_label_t {
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public:
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uint32_t label : 20 = 0, qos : 3 = 0, bottom_of_stack : 1 = 0, ttl : 8 = 0;
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std::string print() {
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std::stringstream buffer;
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buffer << "label: " << uint32_t(label) << " "
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<< "qos: " << uint32_t(qos) << " "
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<< "bottom of stack: " << uint32_t(bottom_of_stack) << " "
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<< "ttl: " << uint32_t(ttl);
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return buffer.str();
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}
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};
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static_assert(sizeof(mpls_label_t) == 4, "Bad size for mpls_label_t");
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// We are storing VLAN meta data and next ethertype in same packet
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// It's not standard approach! Be careful!
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class __attribute__((__packed__)) ethernet_vlan_header_t {
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public:
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union __attribute__((__packed__)) {
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// it's not allowed to initialise each bit field here as we initialize vlan_metadata_as_integer
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__extension__ struct { uint16_t vlan_id : 12, cfi : 1, priority : 3; };
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uint16_t vlan_metadata_as_integer = 0;
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};
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uint16_t ethertype = 0;
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void convert() {
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ethertype = ntohs(ethertype);
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vlan_metadata_as_integer = ntohs(vlan_metadata_as_integer);
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}
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std::string print() {
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std::stringstream buffer;
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buffer << "priority: " << uint32_t(priority) << " "
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<< "cfi: " << uint32_t(cfi) << " "
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<< "vlan_id: " << uint32_t(vlan_id) << " ";
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buffer << "ethertype: 0x" << std::setfill('0') << std::setw(4) << std::hex << ethertype;
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return buffer.str();
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}
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};
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static_assert(sizeof(ethernet_vlan_header_t) == 4, "Bad size for ethernet_vlan_header_t");
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class __attribute__((__packed__)) ethernet_header_t {
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public:
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uint8_t destination_mac[6];
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uint8_t source_mac[6];
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uint16_t ethertype = 0;
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void convert() {
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ethertype = ntohs(ethertype);
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}
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std::string print() {
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std::stringstream buffer;
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buffer << "ethertype: 0x" << std::setfill('0') << std::setw(4) << std::hex << ethertype;
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buffer << " "
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<< "source mac: " << convert_mac_to_string(source_mac) << " "
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<< "destination mac: " << convert_mac_to_string(destination_mac);
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return buffer.str();
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}
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};
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static_assert(sizeof(ethernet_header_t) == 14, "Bad size for ethernet_header_t");
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// Please be careful!
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// This structure will work only for IPv4 (4 byte address) + ethernet (6 byte
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// address)
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class __attribute__((__packed__)) arp_header_t {
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public:
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uint16_t hardware_type = 0;
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uint16_t protocol_type = 0;
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uint8_t hardware_address_length = 0;
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uint8_t protocol_address_length = 0;
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uint16_t operation = 0;
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uint8_t sender_hardware_address[6];
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uint32_t sender_protocol_address = 0;
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uint8_t target_hardware_address[6];
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uint32_t target_protocol_address = 0;
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void convert() {
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// 16 bit
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hardware_type = ntohs(hardware_type);
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protocol_type = ntohs(protocol_type);
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operation = ntohs(operation);
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// 32 bit
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sender_protocol_address = ntohl(sender_protocol_address);
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target_protocol_address = ntohl(target_protocol_address);
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}
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std::string print() {
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std::stringstream buffer;
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buffer << "hardware_type: " << uint32_t(hardware_type) << " "
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<< "protocol_type: " << uint32_t(protocol_type) << " "
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<< "hardware_address_length: " << uint32_t(hardware_address_length) << " "
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<< "protocol_address_length: " << uint32_t(protocol_address_length) << " "
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<< "operation: " << uint32_t(operation) << " "
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<< "sender_hardware_address: " << convert_mac_to_string(sender_hardware_address) << " "
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<< "sender_protocol_address: " << convert_ip_as_little_endian_to_string(sender_protocol_address) << " "
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<< "target_hardware_address: " << convert_mac_to_string(target_hardware_address) << " "
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<< "target_protocol_address: " << convert_ip_as_little_endian_to_string(target_protocol_address);
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return buffer.str();
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}
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};
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class __attribute__((__packed__)) icmp_header_t {
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public:
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uint8_t type = 0;
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uint8_t code = 0;
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uint16_t checksum = 0;
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uint32_t rest_of_header = 0;
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void convert() {
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checksum = htons(checksum);
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}
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std::string print() {
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std::stringstream buffer;
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buffer << "type: " << uint32_t(type) << " "
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<< "code: " << uint32_t(code) << " "
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<< "checksum: " << uint32_t(checksum);
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return buffer.str();
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}
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};
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class __attribute__((__packed__)) udp_header_t {
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public:
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uint16_t source_port = 0;
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uint16_t destination_port = 0;
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uint16_t length = 0;
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uint16_t checksum = 0;
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void convert() {
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source_port = ntohs(source_port);
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destination_port = ntohs(destination_port);
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length = ntohs(length);
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checksum = ntohs(checksum);
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}
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std::string print() {
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std::stringstream buffer;
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buffer << "source_port: " << source_port << " "
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<< "destination_port: " << destination_port << " "
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<< "length: " << length << " "
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<< "checksum: " << checksum;
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return buffer.str();
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}
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};
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static_assert(sizeof(udp_header_t) == 8, "Bad size for udp_header_t");
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// https://datatracker.ietf.org/doc/html/rfc2784
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class __attribute__((__packed__)) gre_packet_t {
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public:
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// Not sure about order of them, worth checking in future
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// For some reasons PVS thinks that we did not initialised all members. I think they're not that great with bitfields
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uint16_t checksum : 1 = 0, reserved : 12 = 0, version : 3 = 0; //-V730
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uint16_t protocol_type = 0;
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void convert() {
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// 16 bit
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protocol_type = ntohs(protocol_type);
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}
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std::string print() {
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std::stringstream buffer;
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buffer << "checksum: " << uint32_t(checksum) << " "
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<< "reserved: " << uint32_t(reserved) << " "
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<< "version: " << uint32_t(version) << " "
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<< "protocol_type: " << uint32_t(protocol_type);
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return buffer.str();
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}
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};
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static_assert(sizeof(gre_packet_t) == 4, "Bad size for gre_packet_t");
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// It's tcp packet flags represented as bitfield for user friendly access to this flags
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class __attribute__((__packed__)) tcp_flags_as_uint16_t {
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public:
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uint16_t fin : 1 = 0, syn : 1 = 0, rst : 1 = 0, psh : 1 = 0, ack : 1 = 0, urg : 1 = 0, ece : 1 = 0, cwr : 1 = 0,
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ns : 1 = 0, reserved : 3 = 0, data_offset : 4 = 0;
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std::string print() {
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std::stringstream buffer;
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buffer << "data_offset: " << uint32_t(data_offset) << " "
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<< "reserved: " << uint32_t(reserved) << " "
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<< "ns: " << uint32_t(ns) << " "
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<< "cwr: " << uint32_t(cwr) << " "
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<< "ece: " << uint32_t(ece) << " "
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<< "urg: " << uint32_t(urg) << " "
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<< "ack: " << uint32_t(ack) << " "
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<< "psh: " << uint32_t(psh) << " "
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<< "rst: " << uint32_t(rst) << " "
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<< "syn: " << uint32_t(syn) << " "
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<< "fin: " << uint32_t(fin);
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return buffer.str();
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}
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};
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// It's another version of previous code suitable for nice casting from 32 bit
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class __attribute__((__packed__)) tcp_flags_as_uint32_t {
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public:
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tcp_flags_as_uint16_t data{};
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uint16_t not_used1i = 0;
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uint8_t not_used2 = 0;
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std::string print() {
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return data.print();
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}
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};
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class __attribute__((__packed__)) tcp_header_t {
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public:
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uint16_t source_port = 0;
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uint16_t destination_port = 0;
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uint32_t sequence_number = 0;
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uint32_t ack_number = 0;
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union __attribute__((__packed__)) {
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__extension__ struct __attribute__((__packed__)) {
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// uint16_t data_offset : 4, reserved : 3, ns : 1, cwr : 1, ece : 1, urg :
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// 1, ack : 1,
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// psh : 1, rst : 1, syn : 1, fin : 1;
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// it's not allowed to initialize each bitfield here as we initialize data_offset_and_flags_as_integer
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uint16_t fin : 1, syn : 1, rst : 1, psh : 1, ack : 1, urg : 1, ece : 1, cwr : 1, ns : 1, reserved : 3, data_offset : 4;
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};
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uint16_t data_offset_and_flags_as_integer = 0;
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};
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uint16_t window_size = 0;
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uint16_t checksum = 0;
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uint16_t urgent = 0;
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void convert() {
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// 16 bit data
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source_port = ntohs(source_port);
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destination_port = ntohs(destination_port);
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window_size = ntohs(window_size);
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checksum = ntohs(checksum);
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urgent = ntohs(urgent);
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data_offset_and_flags_as_integer = ntohs(data_offset_and_flags_as_integer);
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// 32 bit data
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sequence_number = ntohl(sequence_number);
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ack_number = ntohl(ack_number);
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}
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std::string print() {
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std::stringstream buffer;
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buffer << "source_port: " << source_port << " "
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<< "destination_port: " << destination_port << " "
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<< "sequence_number: " << sequence_number << " "
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<< "ack_number: " << ack_number << " "
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<< "data_offset: " << uint32_t(data_offset) << " "
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<< "reserved: " << uint32_t(reserved) << " "
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<< "ns: " << uint32_t(ns) << " "
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<< "cwr: " << uint32_t(cwr) << " "
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<< "ece: " << uint32_t(ece) << " "
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<< "urg: " << uint32_t(urg) << " "
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<< "ack: " << uint32_t(ack) << " "
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<< "psh: " << uint32_t(psh) << " "
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<< "rst: " << uint32_t(rst) << " "
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<< "syn: " << uint32_t(syn) << " "
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<< "fin: " << uint32_t(fin) << " "
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<< "window_size: " << window_size << " "
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<< "checksum: " << checksum << " "
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<< "urgent: " << urgent;
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return buffer.str();
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}
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};
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static_assert(sizeof(tcp_header_t) == 20, "Bad size for tcp_header_t");
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typedef uint8_t ipv6_address[16];
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// Custom type for pretty printing
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typedef uint16_t ipv6_address_16bit_blocks[8];
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inline std::string convert_ipv6_in_byte_array_to_string(uint8_t (&v6_address)[16]) {
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std::stringstream buffer;
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uint16_t* pretty_print = (uint16_t*)v6_address;
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for (int i = 0; i < 8; i++) {
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buffer << std::hex << fast_ntoh(pretty_print[i]);
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if (i != 7) {
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buffer << ":";
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}
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}
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return buffer.str();
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}
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/*
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For full IPv6 support we should implement following option types:
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https://tools.ietf.org/html/rfc2460#page-7
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Hop-by-Hop Options - IpProtocolNumberHOPOPT
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Routing (Type 0) - IpProtocolNumberIPV6_ROUTE
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Fragment - IpProtocolNumberIPV6_FRAG
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Destination Options - IpProtocolNumberIPV6_OPTS
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Authentication - IpProtocolNumberAH
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Encapsulating Security Payload - IpProtocolNumberESP
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*/
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/* IPv6 fragmentation header option */
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class __attribute__((__packed__)) ipv6_extension_header_fragment_t {
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public:
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uint8_t next_header = 0;
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uint8_t reserved1 = 0;
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union __attribute__((__packed__)) {
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__extension__ struct {
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// uint16_t fragment_offset : 13, reserved2 : 2, more_fragments : 1;
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// it's not allowed to initialize each bitfield here as we initialize fragmentation_and_flags_as_integer
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uint16_t more_fragments : 1, reserved2 : 2, fragment_offset : 13;
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};
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uint16_t fragmentation_and_flags_as_integer = 0;
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};
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uint32_t identification = 0;
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void convert() {
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fragmentation_and_flags_as_integer = ntohs(fragmentation_and_flags_as_integer);
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identification = ntohl(identification);
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}
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std::string print() {
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std::stringstream buffer;
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buffer << "next_header: " << uint32_t(next_header) << " "
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<< "reserved1: " << uint32_t(reserved1) << " "
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<< "fragment_offset: " << uint32_t(fragment_offset) << " "
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<< "reserverd2: " << uint32_t(reserved2) << " "
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<< "more_fragments: " << uint32_t(more_fragments) << " "
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<< "identification: " << identification;
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return buffer.str();
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}
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};
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static_assert(sizeof(ipv6_extension_header_fragment_t) == 8, "Bad size for ipv6_extension_header_fragment_t");
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class __attribute__((__packed__)) ipv6_header_t {
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public:
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union __attribute__((__packed__)) {
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// it's not allowed to initialize each bitfield here as we initialize version_and_traffic_class_as_integer
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__extension__ struct { uint32_t flow_label : 20, traffic_class : 8, version : 4; };
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uint32_t version_and_traffic_class_as_integer = 0;
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};
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uint16_t payload_length = 0;
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uint8_t next_header = 0;
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uint8_t hop_limit = 0;
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ipv6_address source_address{};
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ipv6_address destination_address{};
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void convert() {
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payload_length = ntohs(payload_length);
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version_and_traffic_class_as_integer = ntohl(version_and_traffic_class_as_integer);
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}
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std::string print() {
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std::stringstream buffer;
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buffer << "version: " << uint32_t(version) << " "
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<< "traffic_class: " << uint32_t(traffic_class) << " "
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<< "flow_label: " << uint32_t(flow_label) << " "
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<< "payload_length: " << uint32_t(payload_length) << " "
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<< "next_header: " << uint32_t(next_header) << " "
|
|
<< "hop_limit: " << uint32_t(hop_limit) << " "
|
|
<< "source_address: " << convert_ipv6_in_byte_array_to_string(source_address) << " "
|
|
<< "destination_address: " << convert_ipv6_in_byte_array_to_string(destination_address);
|
|
|
|
return buffer.str();
|
|
}
|
|
};
|
|
|
|
static_assert(sizeof(ipv6_header_t) == 40, "Bad size for ipv6_header_t");
|
|
|
|
// It's class for fragmentation flag representation. It's pretty useful in some cases
|
|
class __attribute__((__packed__)) ipv4_header_fragmentation_flags_t {
|
|
public:
|
|
union __attribute__((__packed__)) {
|
|
// We should store bitfields in nested struct. Otherwise each of bitfields
|
|
// will use same
|
|
// storage as each other!
|
|
// We are using GCC extension here. It's working perfectly for clang and gcc
|
|
// but could
|
|
// produce warning in pedantic mode
|
|
// it's not allowed to initialize each bitfield here as we initialize fragmentation_details_as_integer
|
|
__extension__ struct {
|
|
uint16_t fragment_offset : 13, more_fragments_flag : 1, dont_fragment_flag : 1, reserved_flag : 1;
|
|
};
|
|
|
|
uint16_t fragmentation_details_as_integer = 0;
|
|
};
|
|
|
|
std::string print() {
|
|
|
|
std::stringstream buffer;
|
|
buffer << "fragment_offset: " << uint32_t(fragment_offset) << " "
|
|
<< "reserved_flag: " << uint32_t(reserved_flag) << " "
|
|
<< "dont_fragment_flag: " << uint32_t(dont_fragment_flag) << " "
|
|
<< "more_fragments_flag: " << uint32_t(more_fragments_flag);
|
|
|
|
return buffer.str();
|
|
}
|
|
};
|
|
|
|
static_assert(sizeof(ipv4_header_fragmentation_flags_t) == 2, "Bad size for ipv4_header_fragmentation_flags_t");
|
|
|
|
// It's another version of previous code suitable for nice casting from 32 bit
|
|
class __attribute__((__packed__)) ipv4_header_fragmentation_flags_as_32bit_t {
|
|
public:
|
|
ipv4_header_fragmentation_flags_t data;
|
|
uint16_t not_used1 = 0;
|
|
|
|
std::string print() {
|
|
return data.print();
|
|
}
|
|
};
|
|
|
|
class __attribute__((__packed__)) ipv4_header_t {
|
|
public:
|
|
uint8_t ihl : 4 = 0, version : 4 = 0;
|
|
uint8_t ecn : 2 = 0, dscp : 6 = 0;
|
|
|
|
// This is the combined length of the header and the data
|
|
uint16_t total_length = 0;
|
|
uint16_t identification = 0;
|
|
|
|
union __attribute__((__packed__)) {
|
|
// We should store bitfields in nested struct. Otherwise each of bitfields
|
|
// will use same
|
|
// storage as each other!
|
|
// We are using GCC extension here. It's working perfectly for clang and gcc
|
|
// but could
|
|
// produce warning in pedantic mode
|
|
// it's not allowed to initialize each bitfield here as we initialize fragmentation_details_as_integer
|
|
__extension__ struct {
|
|
uint16_t fragment_offset : 13, more_fragments_flag : 1, dont_fragment_flag : 1, reserved_flag : 1;
|
|
};
|
|
|
|
uint16_t fragmentation_details_as_integer = 0;
|
|
};
|
|
|
|
uint8_t ttl = 0;
|
|
uint8_t protocol = 0;
|
|
uint16_t checksum = 0;
|
|
uint32_t source_ip = 0;
|
|
uint32_t destination_ip = 0;
|
|
|
|
ipv4_header_t()
|
|
: ihl(0), version(0), ecn(0), dscp(0), total_length(0), identification(0), fragmentation_details_as_integer(0),
|
|
ttl(0), protocol(0), checksum(0), source_ip(0), destination_ip(0) {
|
|
}
|
|
|
|
// Should be called AFTER convert() call
|
|
bool is_fragmented() {
|
|
if (this->more_fragments_flag != 0) {
|
|
return true;
|
|
}
|
|
|
|
if (this->fragment_offset != 0) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void convert() {
|
|
// Convert all 2 or 4 byte values to little endian from network format (big
|
|
// endian)
|
|
|
|
// 4 byte integers
|
|
source_ip = ntohl(source_ip);
|
|
destination_ip = ntohl(destination_ip);
|
|
|
|
fragmentation_details_as_integer = ntohs(fragmentation_details_as_integer);
|
|
|
|
// 2 byte integers
|
|
identification = ntohs(identification);
|
|
total_length = ntohs(total_length);
|
|
}
|
|
|
|
std::string print() {
|
|
std::stringstream buffer;
|
|
|
|
buffer << "version: " << uint32_t(version) << " "
|
|
<< "ihl: " << uint32_t(ihl) << " "
|
|
<< "dscp: " << uint32_t(dscp) << " "
|
|
<< "ecn: " << uint32_t(ecn) << " "
|
|
<< "length: " << uint32_t(total_length) << " "
|
|
<< "identification: " << uint32_t(identification) << " "
|
|
<< "fragment_offset: " << uint32_t(fragment_offset) << " "
|
|
<< "reserved_flag: " << uint32_t(reserved_flag) << " "
|
|
<< "dont_fragment_flag: " << uint32_t(dont_fragment_flag) << " "
|
|
<< "more_fragments_flag: " << uint32_t(more_fragments_flag) << " "
|
|
<< "ttl: " << uint32_t(ttl) << " "
|
|
<< "protocol: " << uint32_t(protocol) << " "
|
|
<< "checksum: " << uint32_t(checksum) << " "
|
|
<< "source_ip: " << convert_ip_as_little_endian_to_string(source_ip) << " "
|
|
<< "destination_ip: " << convert_ip_as_little_endian_to_string(destination_ip);
|
|
|
|
return buffer.str();
|
|
}
|
|
};
|
|
|
|
static_assert(sizeof(ipv4_header_t) == 20, "Bad size for ipv4_header_t");
|
|
|
|
enum class parser_code_t {
|
|
memory_violation,
|
|
not_ipv4,
|
|
success,
|
|
broken_gre,
|
|
no_ipv6_support,
|
|
no_ipv6_options_support,
|
|
unknown_ethertype,
|
|
arp
|
|
};
|
|
|
|
std::string parser_code_to_string(parser_code_t code);
|
|
} // namespace network_data_stuctures
|