1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
typedef struct Udphdr Udphdr;
struct Udphdr
{
uchar d[6]; /* Ethernet destination */
uchar s[6]; /* Ethernet source */
uchar type[2]; /* Ethernet packet type */
uchar vihl; /* Version and header length */
uchar tos; /* Type of service */
uchar length[2]; /* packet length */
uchar id[2]; /* Identification */
uchar frag[2]; /* Fragment information */
/* Udp pseudo ip really starts here */
uchar ttl;
uchar udpproto; /* Protocol */
uchar udpplen[2]; /* Header plus data length */
uchar udpsrc[4]; /* Ip source */
uchar udpdst[4]; /* Ip destination */
uchar udpsport[2]; /* Source port */
uchar udpdport[2]; /* Destination port */
uchar udplen[2]; /* data length */
uchar udpcksum[2]; /* Checksum */
};
typedef struct Etherhdr Etherhdr;
struct Etherhdr
{
uchar d[6];
uchar s[6];
uchar type[2];
/* Now we have the ip fields */
uchar vihl; /* Version and header length */
uchar tos; /* Type of service */
uchar length[2]; /* packet length */
uchar id[2]; /* Identification */
uchar frag[2]; /* Fragment information */
uchar ttl; /* Time to live */
uchar proto; /* Protocol */
uchar cksum[2]; /* Header checksum */
uchar src[4]; /* Ip source */
uchar dst[4]; /* Ip destination */
};
enum
{
IP_VER = 0x40,
IP_HLEN = 0x05,
UDP_EHSIZE = 22,
UDP_PHDRSIZE = 12,
UDP_HDRSIZE = 20,
ETHER_HDR = 14,
IP_UDPPROTO = 17,
ET_IP = 0x800,
Bcastip = 0xffffffff,
BPportsrc = 68,
BPportdst = 67,
TFTPport = 69,
Timeout = 5000, /* milliseconds */
Bootrequest = 1,
Bootreply = 2,
Tftp_READ = 1,
Tftp_WRITE = 2,
Tftp_DATA = 3,
Tftp_ACK = 4,
Tftp_ERROR = 5,
Segsize = 512,
TFTPSZ = Segsize+10,
};
typedef struct Bootp Bootp;
struct Bootp
{
uchar op; /* opcode */
uchar htype; /* hardware type */
uchar hlen; /* hardware address len */
uchar hops; /* hops */
uchar xid[4]; /* a random number */
uchar secs[2]; /* elapsed snce client started booting */
uchar pad[2];
uchar ciaddr[4]; /* client IP address (client tells server) */
uchar yiaddr[4]; /* client IP address (server tells client) */
uchar siaddr[4]; /* server IP address */
uchar giaddr[4]; /* gateway IP address */
uchar chaddr[16]; /* client hardware address */
char sname[64]; /* server host name (optional) */
char file[128]; /* boot file name */
char vend[128]; /* vendor-specific goo */
};
typedef struct Netaddr Netaddr;
struct Netaddr
{
ulong ip;
ushort port;
char ea[Eaddrlen];
};
|
