一．    關(guān)于ARP協(xié)議的基礎(chǔ)知識(shí)

     3. ARP包的填充

二。發(fā)送數(shù)據(jù)包的編程實(shí)現(xiàn)

   1.填充數(shù)據(jù)包

.........................緊接上文............................

二．  發(fā)送ARP包的編程實(shí)現(xiàn)

1.        填充數(shù)據(jù)包

上面的那些關(guān)于ARP包各個(gè)字段的表格，對(duì)應(yīng)在程序里就是結(jié)構(gòu)體，對(duì)應(yīng)于上面的表格，于是我們需要三個(gè)下面這樣的結(jié)構(gòu)體

// DLC Header

typedef struct tagDLCHeader                    

{

   unsigned char      DesMAC[6];             /* destination HW addrress */

   unsigned char      SrcMAC[6];             /* source HW addresss */

   unsigned short     Ethertype;                /* ethernet type */

} DLCHEADER, *PDLCHEADER;

// ARP Frame

typedef struct tagARPFrame                     

{

          unsigned short         HW_Type;           /* hardware address */

          unsigned short         Prot_Type;             /* protocol address */

          unsigned char      HW_Addr_Len;       /* length of hardware address */

          unsigned char      Prot_Addr_Len;         /* length of protocol address */

          unsigned short         Opcode;                /* ARP/RARP */

          unsigned char      Send_HW_Addr[6];     /* sender hardware address */

          unsigned long      Send_Prot_Addr;      /* sender protocol address */

          unsigned char      Targ_HW_Addr[6];     /* target hardware address */

          unsigned long      Targ_Prot_Addr;      /* target protocol address */

          unsigned char      padding[18];

} ARPFRAME, *PARPFRAME;

// ARP Packet = DLC header + ARP Frame

typedef struct tagARPPacket                

{

     DLCHEADER     dlcHeader;

     ARPFRAME      arpFrame;

} ARPPACKET, *PARPPACKET;

這些結(jié)構(gòu)體一定能看懂吧，在程序中就是對(duì)號(hào)入座就好了