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packet_to_string_test.c
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/*
* Copyright 2013 Google Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* Author: ncardwell@google.com (Neal Cardwell)
*
* Test for generating human-readable representations of IP packets.
*/
#include "packet_to_string.h"
#include "assert.h"
#include "packet_parser.h"
#include <stdlib.h>
#include <string.h>
#include "packet_checksum.h"
u8 *push_data(u8 *data, u8 value, int *size, int *capacity)
{
// printf("realloc size = %d\n", *size);
// printf("realloc capacity = %d\n", *capacity);
if (*size >= *capacity)
{
data = realloc(data, (*capacity) * 2 * sizeof(u8));
(*capacity) *= 2;
}
data[*size] = value;
*size = *size + 1;
return data;
}
u8 *push_bytes(u8 *data, char *fuzz_string, int push_size, int *fuzz_index,
int *size, int *capacity)
{
for (int i = 0; i < push_size; i++)
{
data = push_data(data, fuzz_string[*fuzz_index], size, capacity);
(*fuzz_index)++;
}
return data;
}
void print_packet_as_char(u8 *data, int data_size)
{
for (int i = 0; i < data_size; i++)
{
if (data[i] == 0)
{
printf(" 0 ");
}
else
{
printf(" %c ", data[i]);
}
}
}
static void fuzz_to_packet(char *fuzz_string)
{
int fuzz_data_capacity = 0;
int fuzz_data_size = 0;
int len = strlen(fuzz_string);
printf("len = %d\n", len);
if (len <= 20)
{
strcat(fuzz_string, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");
}
fuzz_data_capacity = strlen(fuzz_string);
u8 fixed_data[] = {
/* IPv4: */
0x45, 0x00,
// IP length 84
0x00, 0x54, 0x00, 0x00, 0x00, 0x00, 0xff, 0x2f, 0xb5, 0x75,
// source ip
0x02, 0x02, 0x02, 0x02,
// dest ip
0x01, 0x01, 0x01, 0x01,
/* GRE: */
0x00, 0x00, 0x08, 0x00,
/* IPv4, TCP: */
// IPv4
0x45, 0x00,
// IP length 60
0x00, 0x3c, 0x00, 0x00, 0x00, 0x00, 0xff, 0x06, 0x39, 0x11,
// 192.0.2.1
0xc0, 0x00, 0x02, 0x01,
// 192.168.0.1
0xc0, 0xa8, 0x00, 0x01};
u8 *data = malloc(fuzz_data_capacity * sizeof(u8));
for (int i = 0; i < sizeof(fixed_data); i++)
{
data = push_data(data, fixed_data[i], &fuzz_data_size, &fuzz_data_capacity);
}
int fuzz_index = 0;
// source port 16 bit
data = push_bytes(data, fuzz_string, 2, &fuzz_index, &fuzz_data_size,
&fuzz_data_capacity);
// dest port 16 bit
data = push_bytes(data, fuzz_string, 2, &fuzz_index, &fuzz_data_size,
&fuzz_data_capacity);
// seq
data = push_bytes(data, fuzz_string, 4, &fuzz_index, &fuzz_data_size,
&fuzz_data_capacity);
// ack seq
data = push_bytes(data, fuzz_string, 4, &fuzz_index, &fuzz_data_size,
&fuzz_data_capacity);
// offset, reserved, control flag, window size
data = push_bytes(data, fuzz_string, 4, &fuzz_index, &fuzz_data_size,
&fuzz_data_capacity);
// set offset to 20 bytes to ignore options now. __LITTLE_ENDIAN or __BIG_ENDIAN
data[sizeof(fixed_data) + 12] = 0x55;
// printf("offset = %d\n", data[fuzz_data_size - 4] >> 4);
// printf("offset = %d\n", data[sizeof(fixed_data) + 13] >> 4);
// checksum, urgent pointer
data = push_bytes(data, fuzz_string, 4, &fuzz_index, &fuzz_data_size,
&fuzz_data_capacity);
// options, padding NOTE: this has no effect for now, because of setting offset to 20 bytes in line 133
data = push_bytes(data, fuzz_string, 4, &fuzz_index, &fuzz_data_size,
&fuzz_data_capacity);
// data
data = push_bytes(data, fuzz_string, 84 - fuzz_data_size, &fuzz_index,
&fuzz_data_size, &fuzz_data_capacity);
print_packet_as_char(data, fuzz_data_size);
struct packet *packet = packet_new(fuzz_data_size);
/* Populate and parse a packet */
memcpy(packet->buffer, data, fuzz_data_size);
char *error = NULL;
enum packet_parse_result_t result =
parse_packet(packet, fuzz_data_size, PACKET_LAYER_3_IP, &error);
checksum_packet(packet);
if (error)
printf("%s\n", error);
assert(result == PACKET_OK);
assert(error == NULL);
int status = 0;
char *dump = NULL;
/* Test a DUMP_SHORT dump */
status = packet_to_string(packet, DUMP_SHORT, &dump, &error);
assert(status == STATUS_OK);
assert(error == NULL);
printf("dump = '%s'\n", dump);
free(dump);
/* Test a DUMP_FULL dump */
status = packet_to_string(packet, DUMP_FULL, &dump, &error);
assert(status == STATUS_OK);
assert(error == NULL);
printf("dump = '%s'\n", dump);
free(dump);
/* Test a DUMP_VERBOSE dump */
status = packet_to_string(packet, DUMP_VERBOSE, &dump, &error);
assert(status == STATUS_OK);
assert(error == NULL);
printf("dump = '%s'\n", dump);
free(dump);
packet_free(packet);
}
static void test_tcp_ipv4_packet_to_string(void)
{
/* An IPv4/GRE/IPv4/TCP packet. */
u8 data[] = {/* IPv4: */
0x45, 0x00, 0x00, 0x54, 0x00, 0x00, 0x00, 0x00, 0xff, 0x2f,
0xb5, 0x75, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01,
/* GRE: */
0x00, 0x00, 0x08, 0x00,
/* IPv4, TCP: */
0x45, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x00, 0x00, 0xff, 0x06,
0x39, 0x11, 0xc0, 0x00, 0x02, 0x01, 0xc0, 0xa8, 0x00, 0x01,
0xcf, 0x3f, 0x1f, 0x90, 0x00, 0x00, 0x00, 0x01, 0x83, 0x4d,
0xa5, 0x5b, 0xa0, 0x10, 0x01, 0x01, 0xdb, 0x2d, 0x00, 0x00,
0x05, 0x0a, 0x83, 0x4d, 0xab, 0x03, 0x83, 0x4d, 0xb0, 0xab,
0x08, 0x0a, 0x00, 0x00, 0x01, 0x2c, 0x60, 0xc2, 0x18, 0x20};
print_packet_as_char(data, sizeof(data));
struct packet *packet = packet_new(sizeof(data));
/* Populate and parse a packet */
memcpy(packet->buffer, data, sizeof(data));
char *error = NULL;
enum packet_parse_result_t result =
parse_packet(packet, sizeof(data), PACKET_LAYER_3_IP, &error);
assert(result == PACKET_OK);
assert(error == NULL);
int status = 0;
char *dump = NULL, *expected = NULL;
/* Test a DUMP_SHORT dump */
status = packet_to_string(packet, DUMP_SHORT, &dump, &error);
assert(status == STATUS_OK);
assert(error == NULL);
printf("dump = '%s'\n", dump);
expected = "ipv4 2.2.2.2 > 1.1.1.1: gre flags 0x0 proto 0x0800: "
". 1:1(0) ack 2202903899 win 257 "
"<sack 2202905347:2202906795,TS val 300 ecr 1623332896>";
assert(strcmp(dump, expected) == 0);
free(dump);
/* Test a DUMP_FULL dump */
status = packet_to_string(packet, DUMP_FULL, &dump, &error);
assert(status == STATUS_OK);
assert(error == NULL);
printf("dump = '%s'\n", dump);
expected = "ipv4 2.2.2.2 > 1.1.1.1: gre flags 0x0 proto 0x0800: "
"192.0.2.1:53055 > 192.168.0.1:8080 "
". 1:1(0) ack 2202903899 win 257 "
"<sack 2202905347:2202906795,TS val 300 ecr 1623332896>";
assert(strcmp(dump, expected) == 0);
free(dump);
/* Test a DUMP_VERBOSE dump */
status = packet_to_string(packet, DUMP_VERBOSE, &dump, &error);
assert(status == STATUS_OK);
assert(error == NULL);
printf("dump = '%s'\n", dump);
expected = "ipv4 2.2.2.2 > 1.1.1.1: gre flags 0x0 proto 0x0800: "
"192.0.2.1:53055 > 192.168.0.1:8080 "
". 1:1(0) ack 2202903899 win 257 "
"<sack 2202905347:2202906795,TS val 300 ecr 1623332896>"
"\n"
"0x0000: 45 00 00 54 00 00 00 00 ff 2f b5 75 02 02 02 02 "
"\n"
"0x0010: 01 01 01 01 00 00 08 00 45 00 00 3c 00 00 00 00 "
"\n"
"0x0020: ff 06 39 11 c0 00 02 01 c0 a8 00 01 cf 3f 1f 90 "
"\n"
"0x0030: 00 00 00 01 83 4d a5 5b a0 10 01 01 db 2d 00 00 "
"\n"
"0x0040: 05 0a 83 4d ab 03 83 4d b0 ab 08 0a 00 00 01 2c "
"\n"
"0x0050: 60 c2 18 20 "
"\n";
assert(strcmp(dump, expected) == 0);
free(dump);
packet_free(packet);
}
static void test_tcp_ipv6_packet_to_string(void)
{
/* An IPv6/GRE/TCP/IPv6 packet. */
u8 data[] = {
/* IPv6: */
0x60,
0x00,
0x00,
0x00,
0x00,
0x4c,
0x2f,
0xff,
0x00,
0x02,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x22,
0x22,
0x00,
0x01,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x11,
0x11,
/* GRE: */
0x00,
0x00,
0x86,
0xdd,
/* IPv6, TCP: */
0x60,
0x00,
0x00,
0x00,
0x00,
0x20,
0x06,
0xff,
0x20,
0x01,
0x0d,
0xb8,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x01,
0xfd,
0x3d,
0xfa,
0x7b,
0xd1,
0x7d,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x01,
0xd3,
0xe2,
0x1f,
0x90,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x80,
0x02,
0x80,
0x18,
0x06,
0x60,
0x00,
0x00,
0x02,
0x04,
0x03,
0xe8,
0x04,
0x02,
0x01,
0x01,
0x01,
0x03,
0x03,
0x07,
};
struct packet *packet = packet_new(sizeof(data));
/* Populate and parse a packet */
memcpy(packet->buffer, data, sizeof(data));
char *error = NULL;
enum packet_parse_result_t result =
parse_packet(packet, sizeof(data), PACKET_LAYER_3_IP, &error);
assert(result == PACKET_OK);
assert(error == NULL);
int status = 0;
char *dump = NULL, *expected = NULL;
/* Test a DUMP_SHORT dump */
status = packet_to_string(packet, DUMP_SHORT, &dump, &error);
assert(status == STATUS_OK);
assert(error == NULL);
printf("dump = '%s'\n", dump);
expected = "ipv6 2::2222 > 1::1111: gre flags 0x0 proto 0x86dd: "
"S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>";
assert(strcmp(dump, expected) == 0);
free(dump);
/* Test a DUMP_FULL dump */
status = packet_to_string(packet, DUMP_FULL, &dump, &error);
assert(status == STATUS_OK);
assert(error == NULL);
printf("dump = '%s'\n", dump);
expected = "ipv6 2::2222 > 1::1111: gre flags 0x0 proto 0x86dd: "
"2001:db8::1:54242 > fd3d:fa7b:d17d::1:8080 "
"S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>";
assert(strcmp(dump, expected) == 0);
free(dump);
/* Test a DUMP_VERBOSE dump */
status = packet_to_string(packet, DUMP_VERBOSE, &dump, &error);
assert(status == STATUS_OK);
assert(error == NULL);
printf("dump = '%s'\n", dump);
expected = "ipv6 2::2222 > 1::1111: gre flags 0x0 proto 0x86dd: "
"2001:db8::1:54242 > fd3d:fa7b:d17d::1:8080 "
"S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>\n"
"0x0000: 60 00 00 00 00 4c 2f ff 00 02 00 00 00 00 00 00 "
"\n"
"0x0010: 00 00 00 00 00 00 22 22 00 01 00 00 00 00 00 00 "
"\n"
"0x0020: 00 00 00 00 00 00 11 11 00 00 86 dd 60 00 00 00 "
"\n"
"0x0030: 00 20 06 ff 20 01 0d b8 00 00 00 00 00 00 00 00 "
"\n"
"0x0040: 00 00 00 01 fd 3d fa 7b d1 7d 00 00 00 00 00 00 "
"\n"
"0x0050: 00 00 00 01 d3 e2 1f 90 00 00 00 00 00 00 00 00 "
"\n"
"0x0060: 80 02 80 18 06 60 00 00 02 04 03 e8 04 02 01 01 "
"\n"
"0x0070: 01 03 03 07 "
"\n";
assert(strcmp(dump, expected) == 0);
free(dump);
packet_free(packet);
}
static void test_gre_mpls_tcp_ipv4_packet_to_string(void)
{
/* An IPv4/GRE/MPLS/IPv4/TCP packet. */
u8 data[] = {/* IPv4: */
0x45, 0x00, 0x00, 0x54, 0x00, 0x00, 0x40, 0x00, 0x40, 0x2f,
0xb7, 0xcf, 0xc0, 0xa8, 0x00, 0x01, 0xc0, 0x00, 0x02, 0x02,
/* GRE: */
0x00, 0x00, 0x88, 0x47,
/* MPLS: */
0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
/* IPv4, TCP: */
0x45, 0x00, 0x00, 0x34, 0x86, 0x99, 0x40, 0x00, 0x40, 0x06,
0x31, 0x80, 0xc0, 0xa8, 0x00, 0x01, 0xc0, 0x00, 0x02, 0x01,
0x1f, 0x90, 0xdb, 0xcc, 0x7b, 0x81, 0xc5, 0x7c, 0x00, 0x00,
0x00, 0x01, 0x80, 0x11, 0x01, 0xc5, 0xa6, 0xa6, 0x00, 0x00,
0x01, 0x01, 0x08, 0x0a, 0x07, 0x02, 0x08, 0x43, 0x00, 0x00,
0x00, 0x05};
struct packet *packet = packet_new(sizeof(data));
/* Populate and parse a packet */
memcpy(packet->buffer, data, sizeof(data));
char *error = NULL;
enum packet_parse_result_t result =
parse_packet(packet, sizeof(data), PACKET_LAYER_3_IP, &error);
assert(result == PACKET_OK);
assert(error == NULL);
int status = 0;
char *dump = NULL, *expected = NULL;
/* Test a DUMP_FULL dump */
status = packet_to_string(packet, DUMP_FULL, &dump, &error);
assert(status == STATUS_OK);
assert(error == NULL);
printf("dump = '%s'\n", dump);
expected = "ipv4 192.168.0.1 > 192.0.2.2: gre flags 0x0 proto 0x8847: "
"mpls (label 0, tc 0, ttl 0) "
"(label 1048575, tc 7, [S], ttl 255): "
"192.168.0.1:8080 > 192.0.2.1:56268 "
"F. 2072102268:2072102268(0) ack 1 win 453 "
"<nop,nop,TS val 117573699 ecr 5>";
assert(strcmp(dump, expected) == 0);
free(dump);
}
static void test_tcp_md5_option_to_string(void)
{
/* An IPv4/TCP packet. */
u8 data[] = {/* IPv4, TCP: */
0x45, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x00, 0x00, 0xff, 0x06,
0x89, 0x56, 0xc0, 0x00, 0x02, 0x01, 0xc0, 0xa8, 0xaf, 0xbb,
0x8a, 0x6f, 0x1f, 0x90, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
0x00, 0x01, 0xa0, 0x02, 0x01, 0x00, 0x36, 0x14, 0x00, 0x00,
0x13, 0x12, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x01, 0x01};
struct packet *packet = packet_new(sizeof(data));
/* Populate and parse a packet */
memcpy(packet->buffer, data, sizeof(data));
char *error = NULL;
enum packet_parse_result_t result =
parse_packet(packet, sizeof(data), PACKET_LAYER_3_IP, &error);
assert(result == PACKET_OK);
assert(error == NULL);
int status = 0;
char *dump = NULL, *expected = NULL;
/* Test a DUMP_SHORT dump */
status = packet_to_string(packet, DUMP_SHORT, &dump, &error);
assert(status == STATUS_OK);
assert(error == NULL);
printf("dump = '%s'\n", dump);
expected = "S 1:1(0) win 256 "
"<md5 000102030405060708090a0b0c0d0e0f,nop,nop>";
assert(strcmp(dump, expected) == 0);
free(dump);
packet_free(packet);
}
int main(void)
{
// test_tcp_ipv4_packet_to_string();
// test_tcp_ipv6_packet_to_string();
// test_gre_mpls_tcp_ipv4_packet_to_string();
// test_tcp_md5_option_to_string();
fuzz_to_packet("4b2v2c24245t2c2087vh28vb928347bt9823bg");
fuzz_to_packet("v3v3g3w45t24g2b3928cbu82ubr2f9hybv92rbv9248vyb24");
fuzz_to_packet("9458vh90seufvb0ebv087bru8vbweivbiwebpn20495ugn904unb");
return 0;
}