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- 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];
- };
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