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dhcp: Add test function for computing checksum

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This commit is contained in:
Patrik Flykt 2013-12-09 23:43:16 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent d8b61a1dc9
commit 39b7f59600
1 changed files with 40 additions and 0 deletions
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40
src/libsystemd-dhcp/test-dhcp-client.c
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@ -22,6 +22,7 @@
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include "dhcp-protocol.h"
#include "sd-dhcp-client.h"
@ -73,9 +74,48 @@ static void test_request_basic(void)
assert(sd_dhcp_client_set_request_option(client, 44) == 0);
}
static uint16_t client_checksum(void *buf, int len)
{
uint32_t sum;
uint16_t *check;
int i;
uint8_t *odd;
sum = 0;
check = buf;
for (i = 0; i < len / 2 ; i++)
sum += check[i];
if (len & 0x01) {
odd = buf;
sum += odd[len];
}
return ~((sum & 0xffff) + (sum >> 16));
}
static void test_checksum(void)
{
uint8_t buf[20] = {
0x45, 0x00, 0x02, 0x40, 0x00, 0x00, 0x00, 0x00,
0x40, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xff, 0xff, 0xff
};
uint8_t check[2] = {
0x78, 0xae
};
uint16_t *val = (uint16_t *)check;
assert(client_checksum(&buf, 20) == *val);
}
int main(int argc, char *argv[])
{
test_request_basic();
test_checksum();
return 0;
}