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-rw-r--r--src/libsystemd-dhcp/test-dhcp-client.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/src/libsystemd-dhcp/test-dhcp-client.c b/src/libsystemd-dhcp/test-dhcp-client.c
index 863f1966cf..d097c7d43c 100644
--- a/src/libsystemd-dhcp/test-dhcp-client.c
+++ b/src/libsystemd-dhcp/test-dhcp-client.c
@@ -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;
}