hw0504.c

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include "dhcp.h"

int main() {
    // int32_t dhcpParse(uint8_t *pData, uint32_t size);
    uint8_t dhcp_data[] = {
        0, 0,                   // 0: padding
        1, 4, 255, 255, 255, 0, // 1: subnet mask (255.255.255.0)
        3, 4, 192, 168, 1, 1,   // 3: router (192.168.1.1)
        4, 4, 192, 168, 1, 2,   // 4: time server (192.168.1.2)
        5, 4, 192, 168, 1, 3,   // 5: name server (192.168.1.3)
        6, 8, 8, 8, 8, 8, 8, 4, 4, 4, // 6: domain name server (8.8.8.8, 8.8.4.4)
        7, 4, 192, 168, 1, 4,   // 7: log server (192.168.1.4)
        8, 4, 192, 168, 1, 5,   // 8: cookie server (192.168.1.5)
        9, 4, 192, 168, 1, 6,   // 9: LPR server (192.168.1.6)
        10, 4, 192, 168, 1, 7,  // 10: impress server (192.168.1.7)
        11, 4, 192, 168, 1, 8,  // 11: resource location server (192.168.1.8)
        12, 12, 'G', '3', '6', 'A', 'r', 'c', 'h', 'l', 'i', 'n', 'u', 'x', // 12: host name ("MyHost123")
        19, 1, 1,               // 19: IP forward enable (1: enable)
        20, 1, 0,               // 20: source routing disable (0: disable)
        2, 4, 0x00, 0x00, 0x70, 0x80,// 2: time offset UTC: +8 hours  28800 seconds
        21, 16 ,
            192, 168, 10, 0,    // 21: policy filter (invalid)
            255, 255, 255, 0, 
            10, 0, 0, 0, 
            255, 0, 0, 0,       
        255                     // 255: end
    };

    dhcpParse(dhcp_data, sizeof(dhcp_data));

    while (1){
        int result = dhcpParse(NULL, 0);
        if (result == 1) {
            continue;
        } else if (result == 0) {
            printf("%d : End of TLV.\n", result);
            int end_result = dhcpParse(NULL, 0);
            printf("%d : no TLVs left. \n", end_result);
            break;
        } else if (result == -1) {
            printf("%d : Invalid input or no TLVs left.\n", result);
        }   
    }
    return 0;
}