2e509336c7
- Added `icmp_checksum`. - Added `icmp_get_time`. - Created unit tests for checksum and time. - Set `-D_POSIX_C_SOURCE=199309L` in CPPFLAGS for clock_gettime support.
58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
#include <criterion/criterion.h>
|
|
#include <stdint.h>
|
|
#include "internal/icmp_utils.h"
|
|
|
|
/* Test 1: Simple ICMP Echo Request header (8 bytes, even length) */
|
|
Test(checksum, echo_request_header)
|
|
{
|
|
/* ICMP Echo Request: type=8, code=0, checksum=0, id=0x1234, seq=0x0001 */
|
|
uint8_t packet[] = {
|
|
0x08, 0x00, 0x00, 0x00, /* type, code, checksum (zeroed) */
|
|
0x12, 0x34, 0x00, 0x01 /* id=0x1234, seq=0x0001 */
|
|
};
|
|
|
|
uint16_t result = icmp_checksum(packet, sizeof(packet));
|
|
|
|
/* Expected checksum calculated manually (network byte order):
|
|
* Words: 0x0800, 0x0000, 0x1234, 0x0001
|
|
* Sum: 0x0800 + 0x0000 + 0x1234 + 0x0001 = 0x1A35
|
|
* Checksum: ~0x1A35 = 0xE5CA */
|
|
cr_assert_eq(result, 0xE5CA,
|
|
"Expected checksum 0xE5CA, got 0x%04X", result);
|
|
}
|
|
|
|
/* Test 2: Odd length packet (9 bytes) */
|
|
Test(checksum, odd_length)
|
|
{
|
|
/* ICMP packet with 9 bytes (last byte should be treated as 0xAB00) */
|
|
uint8_t packet[] = {
|
|
0x08, 0x00, 0x00, 0x00, /* type, code, checksum */
|
|
0x00, 0x00, 0x00, 0x00, /* id, seq */
|
|
0xAB /* 1 byte payload */
|
|
};
|
|
|
|
uint16_t result = icmp_checksum(packet, sizeof(packet));
|
|
|
|
/* Words: 0x0800, 0x0000, 0x0000, 0x0000, 0xAB00 (last byte in high)
|
|
* Sum: 0x0800 + 0x0000 + 0x0000 + 0x0000 + 0xAB00 = 0xB300
|
|
* Checksum: ~0xB300 = 0x4CFF */
|
|
cr_assert_eq(result, 0x4CFF,
|
|
"Expected checksum 0x4CFF, got 0x%04X", result);
|
|
}
|
|
|
|
/* Test 3: Verify checksum - a packet with correct checksum
|
|
* should give 0x0000 when checksummed (including the checksum field) */
|
|
Test(checksum, verify_correct_checksum)
|
|
{
|
|
/* ICMP Echo Request with correct checksum already filled in */
|
|
uint8_t packet[] = {
|
|
0x08, 0x00, 0xE5, 0xCA, /* type, code, checksum=0xE5CA */
|
|
0x12, 0x34, 0x00, 0x01 /* id=0x1234, seq=0x0001 */
|
|
};
|
|
|
|
/* When checksum is included in calculation, result should be 0 */
|
|
uint16_t result = icmp_checksum(packet, sizeof(packet));
|
|
|
|
cr_assert_eq(result, 0x0000,
|
|
"Valid packet should checksum to 0x0000, got 0x%04X", result);
|
|
}
|