#include <gtest/gtest.h>

#include "ipv4_helpers.h"

/*
 * Internet Protocol Version 4, Src: 192.168.36.103, Dst: 192.168.40.137
 *     0100 .... = Version: 4
 *     .... 0101 = Header Length: 20 bytes (5)
 *     Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
 *         0000 00.. = Differentiated Services Codepoint: Default (0)
 *         .... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
 *     Total Length: 44
 *     Identification: 0xffff (65535)
 *     001. .... = Flags: 0x1, More fragments
 *         0... .... = Reserved bit: Not set
 *         .0.. .... = Don't fragment: Not set
 *         ..1. .... = More fragments: Set
 *     ...0 0000 0000 0000 = Fragment Offset: 0
 *     Time to Live: 127
 *     Protocol: TCP (6)
 *     Header Checksum: 0x4d8b [correct]
 *     [Header checksum status: Good]
 *     [Calculated Checksum: 0x4d8b]
 *     Source Address: 192.168.36.103
 *     Destination Address: 192.168.40.137
 *     [Reassembled IPv4 in frame: 5]
 * Data (24 bytes)
 */

unsigned char hdr[] = {0x45, 0x00, 0x00, 0x2c, 0xff, 0xff, 0x20, 0x00, 0x7f, 0x06, 0x4d, 0x8b, 0xc0, 0xa8, 0x24, 0x67, 0xc0, 0xa8, 0x28, 0x89};

TEST(IPV4_HELPERS, GET)
{
    EXPECT_TRUE(ipv4_hdr_get_ipid((struct ip *)hdr) == 65535);
    EXPECT_TRUE(ipv4_hdr_get_flags((struct ip *)hdr) == 1);
    EXPECT_TRUE(ipv4_hdr_get_frag_offset((struct ip *)hdr) == 0);
    EXPECT_TRUE(ipv4_hdr_get_ttl((struct ip *)hdr) == 127);
    EXPECT_TRUE(ipv4_hdr_get_protocol((struct ip *)hdr) == 6);
    EXPECT_TRUE(ipv4_hdr_get_checksum((struct ip *)hdr) == 0x4d8b);
    EXPECT_TRUE(ipv4_hdr_get_src((struct ip *)hdr) == 0xc0a82467);
    EXPECT_TRUE(ipv4_hdr_get_dst((struct ip *)hdr) == 0xc0a82889);
    EXPECT_TRUE(ipv4_hdr_has_flag_rf((struct ip *)hdr) == false);
    EXPECT_TRUE(ipv4_hdr_has_flag_df((struct ip *)hdr) == false);
    EXPECT_TRUE(ipv4_hdr_has_flag_mf((struct ip *)hdr) == true);
}

int main(int argc, char **argv)
{
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}