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main.c
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#define _WINSOCK_DEPRECATED_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#define NOMINMAX
#include "main.h"
#include "prot_headers.h"
#include <assert.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>
#ifdef _WIN32
#pragma comment(lib, "WS2_32.lib")
#include <WinSock2.h>
#include <mstcpip.h>
#include <WS2tcpip.h>
typedef SOCKET Socket;
#define S_INVALID_SOCKET INVALID_SOCKET
#else
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h> // ETH_P_ALL
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
typedef int Socket;
#define S_INVALID_SOCKET -1
#endif
#define FMT_MESSAGE_EXT(tag, message, ...) format_message_ext((tag) , __FILE__, __func__ , __LINE__, message, ##__VA_ARGS__)
#define LOG_ERROR(message, ...) FMT_MESSAGE_EXT("error", message, ##__VA_ARGS__)
#define LOG_WARN(message, ...) format_message("warning" , message, ##__VA_ARGS__)
#define LOG_INFO(message, ...) format_message("info" , message, ##__VA_ARGS__)
int sniffer_main(int argc, char **argv);
int format_message_ext(const char *tag, const char *file, const char *function, const size_t line, const char *fmt, ...);
int format_message(const char *tag, const char *fmt, ...);
Config g_config = { 0 };
int main(int argc, char **argv) {
printf("|=============== EWWWIL SNIFFER ===========|\n");
printf("| Author: Petr Hric ^oo^ |\n");
printf("| Version: 1.0 ^oo^ |\n");
printf("| Support: Windows |\n");
printf("| TODO - Linux ^oo^ |\n");
printf("| GitHub: https://github.com/Petr-Hric |\n");
printf("|==========================================|\n");
#ifdef _WIN32
// Initialize WinSock
struct WSAData wsad = { 0 };
if(0 != WSAStartup(MAKEWORD(2, 2), &wsad)) {
LOG_ERROR("WSAStartup failed\n");
return -1;
}
#endif
const int retv = sniffer_main(argc, argv);
#ifdef _WIN32
WSACleanup();
#endif
return retv;
}
int args_process(const int argc, char **argv);
int config_init(Config *config);
int satisfy_arguments(const uint8_t *data, const size_t size);
Socket socket_setup(const char *interfaceAddr);
int socket_close(Socket *sock);
int sniffer_main(int argc, char **argv) {
if(0 != config_init(&g_config)) {
return -1;
}
const int args_processRetv = args_process(argc, argv);
if(0 != args_processRetv) {
return args_processRetv;
}
// TODO: Verify interface address
// // Get hostname
// char hostName[255] = { 0 };
// if(0 != gethostname(hostName, sizeof(hostName) - 1)) {
// LOG_ERROR("gethostname() failed\n");
// return -1;
// }
//
// printf("[info] hostname: %s\n", hostName);
//
// // Get interface list
// struct hostent *local = gethostbyname(hostName);
// if(NULL == local) {
// LOG_ERROR("gethostbyname() failed\n");
// return -1;
// }
char *buffer = (char *)malloc(RECV_BUFFER_SIZE);
if(NULL == buffer) {
LOG_ERROR("allocation error\n");
return -1;
}
int retv = 0;
// Create socket which will be receiving all the packets going through the selected interface
Socket socket = socket_setup(g_config.interfaceIp);
if(S_INVALID_SOCKET == socket) {
retv = -1;
} else {
struct sockaddr sourceAddr = { 0 };
socklen_t sourceAddrLen = sizeof(struct sockaddr);
while(true) {
sourceAddrLen = sizeof(struct sockaddr);
const int recv = recvfrom(socket, buffer, RECV_BUFFER_SIZE, 0, &sourceAddr, &sourceAddrLen); // TODO: If unknown interface used, this is blocking the loop
if(recv <= 0) {
LOG_ERROR("recvfrom() failed\n");
break;
}
if(0 != (retv = satisfy_arguments((const uint8_t *)buffer, (size_t)recv))) {
break;
}
}
socket_close(&socket);
}
free(buffer);
return retv;
}
// ----------------------------------- DATA PROCESSING ------------------------------------
void buffer_print(const void *data, const size_t size, const size_t n);
int buffer_print_ip_header(const void *data, const size_t size, void *ipHeader);
void buffer_print_tcp_header(const void *data, const size_t size, const tcp_header *header);
void buffer_print_udp_header(const void *data, const size_t size, const udp_header *header);
void buffer_print_icmp_header(const void *data, const size_t size, const icmp_header *header);
void *endian_convert(const void *value, void *output, const Endian endian, const size_t size);
int get_network_address(const char ip[40], uint8_t *output, const size_t size, uint8_t *version);
void *parse_ip_header(const uint8_t *data, const size_t size, uint8_t *version);
void free_ip_header(void **ipHeader, const uint8_t version);
int get_ipv4(const uint32_t networkIPv4Address, char *output, const size_t size);
size_t get_ipv4_size(const uint8_t *data, const size_t size);
size_t get_ipv4_opt_size(const uint8_t *data, const size_t size);
int get_ipv6(const uint8_t *networkIPv6Address, char *output, const size_t size);
size_t tcpByteCount = 0;
size_t udpByteCount = 0;
int satisfy_arguments(const uint8_t *data, const size_t size) {
assert(NULL != data);
uint8_t ipVersion = 0;
void *ipHeader = parse_ip_header((const uint8_t *)data, size, &ipVersion);
if(NULL == ipHeader) {
return -1;
}
switch(ipVersion) {
case 0x04:
{
const ip_header *const header = (const ip_header *)ipHeader;
if(g_config.destinationIpSet) {
if(*((const uint32_t *)g_config.destinationIpNet) != header->dstaddr) {
free_ip_header(&ipHeader, ipVersion);
return 0;
}
}
if(g_config.sourceIpSet) {
if(*((const uint32_t *)g_config.sourceIpNet) != header->srcaddr) {
free_ip_header(&ipHeader, ipVersion);
return 0;
}
}
}
break;
case 0x06:
{
const ip6_header *const header = (const ip6_header *)ipHeader;
if(g_config.destinationIpSet) {
if(0 != memcmp(
g_config.destinationIpNet
, header->dstaddr
, sizeof(g_config.destinationIpNet))) {
free_ip_header(&ipHeader, ipVersion);
return 0;
}
}
if(g_config.sourceIpSet) {
if(0 != memcmp(
g_config.sourceIpNet
, header->srcaddr
, sizeof(g_config.sourceIpNet))) {
free_ip_header(&ipHeader, ipVersion);
return 0;
}
}
}
break;
default:
assert(false);
LOG_ERROR("Unknown IP version\n");
free(ipHeader);
return -1;
}
if(g_config.showRawData) {
buffer_print(data, size, (size_t)g_config.showRawDataBytesPerLine);
}
{
if(g_config.showIPHeader) {
buffer_print_ip_header(data, size, ipHeader);
}
void *ipProtocolData = NULL;
IPProto ipProtocol = IPProtoE_Unknown;
size_t ipDataOffset = 0;
switch(ipVersion) {
case 0x04:
{
const ip_header *const header = (const ip_header *)ipHeader;
ipProtocol = header->protocol;
ipProtocolData = header->data;
ipDataOffset = get_ipv4_size(data, size);
}
break;
case 0x06:
{
const ip6_header *const header = (const ip6_header *)ipHeader;
ipProtocol = header->next_header;
ipProtocolData = header->data;
ipDataOffset = IPV6_HEADER_SIZE_FIXED;
}
break;
default:
assert(false);
LOG_ERROR("Unknown IP version\n");
free(ipHeader);
return -1;
}
assert(ipDataOffset <= size);
const size_t ipProtocolDataSize = size - ipDataOffset;
switch(ipProtocol) {
case IPProtoE_TCP:
{
if(g_config.showByteCount) {
assert(NULL != ipProtocolData);
assert((((const tcp_header *)ipProtocolData)->data_offset * sizeof(uint32_t)) < ipProtocolDataSize);
tcpByteCount += ipProtocolDataSize - (((const tcp_header *)ipProtocolData)->data_offset * sizeof(uint32_t));
printf("\n");
printf("|========================|\n");
printf("| TCP |\n");
printf("|------------------------|\n");
printf("| Byte count: %-10zu |\n", tcpByteCount);
printf("|========================|\n");
}
if(g_config.showTCPHeader) {
buffer_print_tcp_header(data + ipDataOffset, ipProtocolDataSize, (const tcp_header *)ipProtocolData);
}
}
break;
case IPProtoE_UDP:
{
if(g_config.showByteCount) {
assert(NULL != ipProtocolData);
assert(sizeof(udp_header) < ipProtocolDataSize);
udpByteCount += ipProtocolDataSize - sizeof(udp_header);
printf("\n");
printf("|========================|\n");
printf("| TCP |\n");
printf("|------------------------|\n");
printf("| Byte count: %-10zu |\n", udpByteCount);
printf("|========================|\n");
}
if(g_config.showUDPHeader) {
buffer_print_udp_header(data + ipDataOffset, ipProtocolDataSize, (const udp_header *)ipProtocolData);
}
}
break;
case IPProtoE_ICMP:
{
assert(NULL != ipProtocolData);
if(g_config.showICMPHeader) {
buffer_print_icmp_header(data + ipDataOffset, ipProtocolDataSize, (const icmp_header *)ipProtocolData);
}
}
break;
default:
LOG_WARN("Unknown IP protocol %d\n", ipProtocol);
break;
}
}
free(ipHeader);
return 0;
}
// ---------------------------------------- CONFIG ----------------------------------------
int config_init(Config *config) {
assert(NULL != config);
if(NULL == config) {
LOG_ERROR("COnfig cannot be NULL\n");
return -1;
}
memset(config, 0, sizeof(Config));
config->showRawDataBytesPerLine = 20U;
return 0;
}
// ----------------------------------------------------------------------------------------
// ------------------------------------ TERMINAL ARGS -------------------------------------
int args_process(int argc, char **argv) {
assert(NULL != argv);
if(argc <= 1) {
LOG_WARN("No arguments\n");
return -1;
}
++argv;
char **argsEnd = argv + argc;
while(NULL != argv[0]) {
assert(argv < argsEnd);
assert(NULL != argv[0]);
if(strlen(argv[0]) < 2) {
LOG_ERROR("Invalid argument \'%s\'\n", argv[0]);
return -1;
}
switch(argv[0][0]) {
case '-':
switch(argv[0][1]) {
case 'I': // Interface
if(argsEnd == (argv + 1)) {
LOG_ERROR("IP address expected\n");
return -1;
}
++argv;
if(strlen(argv[0]) >= sizeof(g_config.interfaceIp)) {
LOG_ERROR("Interface IP arg is too long\n");
return -1;
}
strcpy(g_config.interfaceIp, argv[0]);
g_config.interfaceIpSet = true;
++argv;
break;
case 's':
if(strlen(argv[0]) > 2 && argv[0][2] == 'P') {
if(argsEnd == (argv + 1)) {
LOG_ERROR("Source port expected\n");
return -1;
}
++argv;
if(1 != sscanf(argv[0], " %"SCNo16, &g_config.sourcePort)) {
LOG_ERROR("Incorrect source port format\n");
return -1;
}
endian_convert(
&g_config.sourcePort
, &g_config.sourcePort
, EndianE_Big
, sizeof(g_config.sourcePort));
g_config.sourcePortSet = true;
} else if(strlen(argv[0]) > 3 && argv[0][2] == 'I' && argv[0][3] == 'P') {
if(argsEnd == (argv + 1)) {
LOG_ERROR("Source IP address expected\n");
return -1;
}
++argv;
if(strlen(argv[0]) >= sizeof(g_config.sourceIp)) {
LOG_ERROR("Source IP arg is too long\n");
return -1;
}
strcpy(g_config.sourceIp, argv[0]);
if(0 != get_network_address(
g_config.sourceIp
, g_config.sourceIpNet
, sizeof(g_config.sourceIpNet)
, &g_config.sourceIpVer)) {
return -1;
}
g_config.destinationIpSet = true;
} else {
LOG_ERROR("Unknown switch extension\n");
return -1;
}
++argv;
break;
case 'd':
if(strlen(argv[0]) > 2 && argv[0][2] == 'P') {
if(argsEnd == (argv + 1)) {
LOG_ERROR("Destination port expected\n");
return -1;
}
++argv;
if(1 != sscanf(argv[0], " %"SCNo16, &g_config.destinationPort)) {
LOG_ERROR("Incorrect destination port format\n");
return -1;
}
endian_convert(
&g_config.destinationPortSet
, &g_config.destinationPortSet
, EndianE_Big
, sizeof(g_config.destinationPortSet));
g_config.destinationPortSet = true;
} else if(strlen(argv[0]) > 3 && argv[0][2] == 'I' && argv[0][3] == 'P') {
if(argsEnd == (argv + 1)) {
LOG_ERROR("Destination IP address expected\n");
return -1;
}
++argv;
if(strlen(argv[0]) >= sizeof(g_config.destinationIp)) {
LOG_ERROR("Destination IP arg is too long\n");
return -1;
}
strcpy(g_config.destinationIp, argv[0]);
if(0 != get_network_address(
g_config.destinationIp
, g_config.destinationIpNet
, sizeof(g_config.destinationIpNet)
, &g_config.destinationIpVer)) {
return -1;
}
g_config.destinationIpSet = true;
} else {
LOG_ERROR("Unknown switch extension\n");
return -1;
}
++argv;
break;
case 'S':
{
bool detail = false;
if(strlen(argv[0]) > 2) {
if(argv[0][2] == 'd') {
detail = true;
} else if(argv[0][2] == 'B') {
g_config.showByteCount = true;
++argv;
break;
}
}
if(argsEnd == (argv + 1)) {
LOG_ERROR("Protocol \n");
return -1;
}
++argv;
if(0 == strcmp(argv[0], "IP")) {
g_config.showIPHeader = true;
g_config.showIPHeaderDetail = detail;
} else if(0 == strcmp(argv[0], "TCP")) {
g_config.showTCPHeader = true;
g_config.showTCPHeaderDetail = detail;
} else if(0 == strcmp(argv[0], "UDP")) {
g_config.showUDPHeader = true;
g_config.showUDPHeaderDetail = detail;
} else if(0 == strcmp(argv[0], "ICMP")) {
g_config.showICMPHeader = true;
g_config.showICMPHeaderDetail = detail;
} else if(0 == strcmp(argv[0], "RAW")) {
g_config.showRawData = true;
g_config.showRawDataDetail = detail;
} else {
LOG_ERROR("Unknown or unsupported protocol \'%s\'\n", argv[0]);
return -1;
}
++argv;
}
break;
default:
LOG_ERROR("Unknown switch \'%s\'\n", argv[0]);
return -1;
}
break;
case '?':
printf("\n");
printf("|=============================================================================================================================|\n");
printf("| Switch | Arguments | Description |\n");
printf("|-----------------------------------------------------------------------------------------------------------------------------|\n");
printf("| ? | Shows this content |\n");
printf("| -I <IP> | Address of interface to be spectated |\n");
printf("| -sIP <IP> | Filter packets according to source IP |\n");
printf("| -sP <Port> | Filter packets according to source port (only for protocols using ports) |\n");
printf("| -dIP <IP> | Filter packets according to destination IP |\n");
printf("| -dP <Port> | Filter packets according to destination port (only for protocols using ports) |\n");
printf("| -SB | Shows number of Bytes send to destination IP (destination IP must be set) |\n");
printf("| -S <Protocol> | Shows data for selected protocol (RAW can be set for raw data) |\n");
printf("| -Sd <Protocol> | Shows detailed data for selected protocol (RAW can be set for raw data + ASCII representation) |\n");
printf("|=============================================================================================================================|\n");
default:
LOG_ERROR("Invalid switch format \'%s\'\n", argv[0]);
return -1;
}
}
if(g_config.interfaceIpSet
&& ((g_config.showByteCount)
|| (g_config.showRawData)
|| (g_config.showIPHeader)
|| (g_config.showTCPHeader)
|| (g_config.showUDPHeader)
|| (g_config.showICMPHeader))) {
return 0;
}
LOG_ERROR("No sufficient arguments passed (no data would be shown)\n");
return -1;
}
// ----------------------------------------------------------------------------------------
// -------------------------------------- BYTE SWAP ---------------------------------------
void *swap_bytes_direct(void *value, const size_t size) {
assert(1U == size || ((size % 2) == 0));
if(size != 1 && ((size % 2) != 0)) {
return NULL;
}
uint8_t *value8 = (uint8_t *)value;
const size_t loopCount = size / 2U;
// This is absolutely not the best way to swap bytes
for(size_t i = 0; i < loopCount; ++i) { // TODO: Compiler built-in byte swap function can be used
const uint8_t temp = value8[i];
value8[i] = value8[size - 1 - i];
value8[size - 1 - i] = temp;
}
return value;
}
void *swap_bytes(const void *value, void *output, const size_t size) {
assert(1U == size || ((size % 2) == 0));
if(size != 1 && ((size % 2) != 0)) {
return NULL;
}
uint8_t *value8 = (uint8_t *)value;
uint8_t *output8 = (uint8_t *)output;
const size_t loopCount = size / 2U;
// This is absolutely not the best way to swap bytes
for(size_t i = 0; i < loopCount; ++i) { // TODO: Compiler built-in byte swap function can be used
const uint8_t temp = value8[i];
output8[i] = value8[size - 1 - i];
output8[size - 1 - i] = temp;
}
return output;
}
// ----------------------------------------------------------------------------------------
// ---------------------------------------- ENDIAN ----------------------------------------
Endian endian_local() {
static const uint32_t testValue32 = 0x00000001;
static const uint8_t *testValue8 = (const uint8_t *)&testValue32;
if(testValue8[0] == 0x01) {
return EndianE_Little;
} else if(testValue8[3] == 0x01) {
return EndianE_Big;
}
return EndianE_Unknown;
}
void *endian_convert(const void *value, void *output, const Endian endian, const size_t size) {
switch(endian_local()) {
case EndianE_Big:
if(EndianE_Big == endian) {
return output;
}
break;
case EndianE_Little:
if(EndianE_Little == endian) {
return output;
}
break;
default:
return NULL;
}
return swap_bytes(value, output, size);
}
// ----------------------------------------------------------------------------------------
// ------------------------------------- BUFFER PRINT -------------------------------------
void buffer_print(const void *data, const size_t size, const size_t n) {
uint8_t *current = (uint8_t *)data;
const uint8_t *end = (const uint8_t *)current + size;
printf("\nRaw packet [%04zu Bytes]\n", size);
while(current != end) {
const size_t remaining = (size_t)(end - current);
const size_t nTemp = remaining > n ? n : remaining;
assert(remaining > 0);
for(size_t i = 0; i < nTemp; ++i) {
printf("%02X ", (uint32_t) * (current + i));
}
if(nTemp < n) {
printf("%*c", (int)(n - nTemp) * 3, ' ');
}
if(g_config.showRawDataDetail) {
printf("| ");
for(size_t i = 0; i < nTemp; ++i) {
if(isalnum(*(current + i)) != 0) {
printf("%c", (char)*(current + i));
} else {
printf(".");
}
}
}
printf("\n");
current += nTemp;
}
}
// ----------------------------------------------------------------------------------------
// -------------------------------- Raw header data PRINT ---------------------------------
void buffer_print_tcp_header(const void *data, const size_t size, const tcp_header *header) {
assert(size >= TCP_HEADER_SIZE_FIXED);
assert(NULL != header);
if(size < TCP_HEADER_SIZE_FIXED) {
LOG_ERROR("Unsufficient buffer size\n");
return;
}
uint8_t *ptr = (uint8_t *)data;
uint8_t endianConversionBuffer[sizeof(uint32_t)];
const uint32_t data_offset = (uint32_t)(((const uint8_t *)data)[12] >> 4);
assert(data_offset >= 5);
assert(data_offset <= 15);
if(data_offset < 5 || data_offset > 15) {
LOG_WARN("TCP -> Invalid \"Data offset\" value. Current: %u Expected (5)-(15)\n", data_offset);
return;
}
if((data_offset * sizeof(uint32_t)) > size) {
LOG_WARN("TCP -> There is not enough data to print out all the TCP header. Current: %zu Needed: At least %lu\n", size, (data_offset * sizeof(uint32_t)));
return;
}
const uint32_t optionCount = data_offset - (TCP_HEADER_SIZE_FIXED / sizeof(uint32_t));
assert(optionCount <= 10);
if(optionCount > 10) {
LOG_WARN("TCP -> Invalid number of options. Current: \"%u\" Expected (0)-(10)\n", optionCount);
return;
}
printf("\n");
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| TCP | 0 | 1 | 2 | 3 |\n");
printf("| | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 |\n");
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Source port | Destination port |\n", *(const uint32_t *)endian_convert(ptr, endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Sequence number |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Acknowledgement number (Significant if ACK flag is set) |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Data off. || || Flags | Window size |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Header + data checksum | Urgent pointer (Significant if URG flag is set) |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
if(optionCount > 0 && optionCount <= 10) {
printf("|--------------------------------------------------------------------------------------------------------------|\n");
for(size_t i = optionCount; i != 0; --i) {
printf("| %08X | Options |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
}
}
printf("|--------------------------------------------------------------------------------------------------------------|\n\n");
}
void buffer_print_udp_header(const void *data, const size_t size, const udp_header *header) {
assert(size >= UDP_HEADER_SIZE_FIXED);
assert(NULL != header);
if(size < UDP_HEADER_SIZE_FIXED) {
LOG_ERROR("Unsufficient buffer size\n");
return;
}
uint8_t *ptr = (uint8_t *)data;
uint8_t endianConversionBuffer[sizeof(uint32_t)];
printf("\n");
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| UDP | 0 | 1 | 2 | 3 |\n");
printf("| | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 |\n");
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Source port | Destination port |\n", *(const uint32_t *)endian_convert(ptr, endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Length | Header + data checksum |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n\n");
}
void buffer_print_icmp_header(const void *data, const size_t size, const icmp_header *header) {
assert(size >= ICMP_HEADER_SIZE_FIXED);
assert(NULL != header);
if(size < ICMP_HEADER_SIZE_FIXED) {
LOG_ERROR("Unsufficient buffer size\n");
return;
}
uint8_t *ptr = (uint8_t *)data;
uint8_t endianConversionBuffer[sizeof(uint32_t)];
printf("\n");
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| ICMP | 0 | 1 | 2 | 3 |\n");
printf("| | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 |\n");
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Type | Code | Header checksum |\n", *(const uint32_t *)endian_convert(ptr, endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Rest of header |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n\n");
}
int buffer_print_ip_header(const void *data, const size_t size, void *header) {
assert(size >= IPV4_HEADER_SIZE_FIXED);
assert(NULL != header);
if(size < IPV4_HEADER_SIZE_FIXED) {
LOG_ERROR("Unsufficient buffer size\n");
return -1;
}
uint8_t *ptr = (uint8_t *)data;
const uint8_t version = (ptr[0] & 0xF0) >> 4;
uint8_t endianConversionBuffer[sizeof(uint32_t)];
switch(version) {
case 0x04:
{
if(g_config.showIPHeaderDetail) {
ip_header *const iph = (ip_header *)header;
char srcIp[40] = { 0 };
char dstIp[40] = { 0 };
if(0 != get_ipv4(iph->srcaddr, srcIp, sizeof(srcIp))) {
return -1;
}
if(0 != get_ipv4(iph->dstaddr, dstIp, sizeof(srcIp))) {
return -1;
}
const uint16_t frag_offset = iph->frag_offset & 0x1FFF;
printf("\n");
printf("|=================================|\n");
printf("| IPV4 |\n");
printf("|---------------------------------|\n");
printf("| Version : %-5"PRIu8" |\n", iph->version);
printf("| IHL : %-5"PRIu8" DWORDS |\n", iph->ihl);
printf("| DSCP : %-5"PRIu8" |\n", iph->dscp);
printf("| ECN : %-5"PRIu8" |\n", iph->ecn);
printf("| Total Length : %-5"PRIu16" Bytes |\n", *(const uint16_t *)endian_convert(&iph->total_length, endianConversionBuffer, EndianE_Big, sizeof(iph->total_length)));
printf("| ID : %-5"PRIu16" |\n", *(const uint16_t *)endian_convert(&iph->id, endianConversionBuffer, EndianE_Big, sizeof(iph->id)));
printf("| Flags : %-5"PRIu16" |\n", iph->flags);
printf("| Frag. Offset : %-5"PRIu16" |\n", *(const uint16_t *)endian_convert(&frag_offset, endianConversionBuffer, EndianE_Big, sizeof(frag_offset)));
printf("| TTL : %-5"PRIu32" |\n", iph->ttl);
printf("| Protocol : %-5"PRIu32" |\n", iph->protocol);
printf("| CRC : %-5"PRIu16" |\n", *(const uint16_t *)endian_convert(&iph->crc, endianConversionBuffer, EndianE_Big, sizeof(iph->crc)));
printf("| Src IP : %-15s |\n", srcIp);
printf("| Dst IP : %-15s |\n", dstIp);
printf("|=================================|\n");
} else {
printf("\n");
printf("|==============================================================================================================|\n");
printf("| IPV4 | 0 | 1 | 2 | 3 |\n");
printf("| | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 |\n");
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Version || IHL | DSCP || ECN | Total length |\n", *(const uint32_t *)endian_convert(ptr, endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Identification | Flags || Fragment offset |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Time to live | Protocol | Header checksum |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Source IP address |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Destination IP address |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|==============================================================================================================|\n\n");
}
ptr += sizeof(uint32_t);
}
break;
case 0x06:
{
if(g_config.showIPHeaderDetail) {
ip6_header *const iph = (ip6_header *)header;
char srcIp[40] = { 0 };
char dstIp[40] = { 0 };
if(0 != get_ipv6(iph->srcaddr, srcIp, sizeof(srcIp))) {
return -1;
}
if(0 != get_ipv6(iph->dstaddr, dstIp, sizeof(srcIp))) {
return -1;
}
const uint32_t _version = iph->version & 0x000FFFFF;
const uint32_t trafic_class = iph->trafic_class & 0x0FF00000;
const uint32_t flow_label = iph->flow_label & 0xF0000000;
printf("\n");
printf("|========================================================|\n");
printf("| IPV6 |\n");
printf("|--------------------------------------------------------|\n");
printf("| Version : %-5"PRIu32" |\n", *(const uint32_t *)endian_convert(&_version, endianConversionBuffer, EndianE_Big, sizeof(_version)));
printf("| Trafic Class : %-5"PRIu32" |\n", *(const uint32_t *)endian_convert(&trafic_class, endianConversionBuffer, EndianE_Big, sizeof(trafic_class)));
printf("| Flow Label : %-5"PRIu32" |\n", *(const uint32_t *)endian_convert(&flow_label, endianConversionBuffer, EndianE_Big, sizeof(flow_label)));
printf("| Payload Len. : %-5"PRIu16" Bytes |\n", *(const uint16_t *)endian_convert(&iph->payload_length, endianConversionBuffer, EndianE_Big, sizeof(iph->payload_length)));
printf("| Next Header : %-5"PRIu8" (Same as IPv4 protocol) |\n", iph->next_header);
printf("| Hop Limit : %-5"PRIu8" Hops |\n", iph->hop_limit);
printf("| Src IP : %-39s |\n", srcIp);
printf("| Dst IP : %-39s |\n", dstIp);
printf("|========================================================|\n");
} else {
printf("\n");
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| IPV6 | 0 | 1 | 2 | 3 |\n");
printf("| | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 | 0 1 2 3 4 5 6 7 |\n");
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Version || Trafic class || Flow label |\n", *(const uint32_t *)endian_convert(ptr, endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Payload length | Next header | Hop limit |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n");
printf("| %08X | Source IP Address |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("| %08X | |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("| %08X | |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("| %08X | |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n"); // TODO: Maybe bad endians for sourca and dest ip
printf("| %08X | Destination IP Address |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("| %08X | |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("| %08X | |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("| %08X | |\n", *(const uint32_t *)endian_convert(ptr += sizeof(uint32_t), endianConversionBuffer, EndianE_Big, sizeof(uint32_t)));
printf("|--------------------------------------------------------------------------------------------------------------|\n\n");
}
ptr += sizeof(uint32_t);
}
break;
default:
assert(false);
LOG_ERROR("Unknown IP version\n");
return -1;
}
assert(ptr >= (const uint8_t *)data);
assert((size_t)(ptr - (const uint8_t *)data) <= size);
return 0;
}
// ----------------------------------------------------------------------------------------
tcp_header *parse_tcp_header(const uint8_t *data, const size_t size) {
assert(NULL != data);
assert(size >= sizeof(tcp_header));
if(NULL == data || size < sizeof(tcp_header)) {
return NULL;
}
tcp_header *header = (tcp_header *)malloc(sizeof(tcp_header));
if(NULL == header) {
return NULL;
}
memcpy(header, data, sizeof(tcp_header));
return header;
}
udp_header *parse_udp_header(const uint8_t *data, const size_t size) {
assert(NULL != data);
assert(size >= sizeof(udp_header));
if(NULL == data || size < sizeof(udp_header)) {
return NULL;
}
udp_header *header = (udp_header *)malloc(sizeof(udp_header));
if(NULL == header) {
return NULL;
}