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
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
|
/*
LUFA Library
Copyright (C) Dean Camera, 2018.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
/*
Copyright 2018 Dean Camera (dean [at] fourwalledcubicle [dot] com)
Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
without fee, provided that the above copyright notice appear in
all copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the name of the author not be used in
advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
The author disclaims all warranties with regard to this
software, including all implied warranties of merchantability
and fitness. In no event shall the author be liable for any
special, indirect or consequential damages or any damages
whatsoever resulting from loss of use, data or profits, whether
in an action of contract, negligence or other tortious action,
arising out of or in connection with the use or performance of
this software.
*/
/* Protocol decoders for Ethernet, TCP, IP, ICMP and ARP. Each of these routines
accepts a header to the appropriate protocol and prints out pertinent information
on the packet through the serial port.
To disable printing of a specific protocol, define the token NO_DECODE_{Protocol}
in the project makefile, and pass it to the compiler using the -D switch.
*/
/** \file
*
* Protocol decoding routines, for the plain-text decoding of Ethernet frames for debugging purposes.
* Enabled protocol decoders will print incoming Ethernet frame contents through the USART in a human
* readable format.
*
* Note that the USART is a slow transmission medium, and will slow down packet processing considerably.
* Packet decoding routines can be disabled by defining NO_DECODE_{Protocol Name} in the project makefile
* and passing it to the compiler via the -D switch.
*/
#include "ProtocolDecoders.h"
/** Decodes an Ethernet frame header and prints its contents to through the USART in a human readable format.
*
* \param[in] InDataStart Pointer to the start of an Ethernet frame of data
*/
void DecodeEthernetFrameHeader(void* InDataStart)
{
#if !defined(NO_DECODE_ETHERNET)
Ethernet_Frame_Header_t* FrameHeader = (Ethernet_Frame_Header_t*)InDataStart;
printf_P(PSTR("\r\n"));
printf_P(PSTR(" ETHERNET\r\n"));
if (!(MAC_COMPARE(&FrameHeader->Destination, &ServerMACAddress)) &&
!(MAC_COMPARE(&FrameHeader->Destination, &BroadcastMACAddress)))
{
printf_P(PSTR(" + NOT ADDRESSED TO DEVICE\r\n"));
return;
}
printf_P(PSTR(" + MAC Source : %02X:%02X:%02X:%02X:%02X:%02X\r\n"), FrameHeader->Source.Octets[0],
FrameHeader->Source.Octets[1],
FrameHeader->Source.Octets[2],
FrameHeader->Source.Octets[3],
FrameHeader->Source.Octets[4],
FrameHeader->Source.Octets[5]);
printf_P(PSTR(" + MAC Dest: %02X:%02X:%02X:%02X:%02X:%02X\r\n"), FrameHeader->Destination.Octets[0],
FrameHeader->Destination.Octets[1],
FrameHeader->Destination.Octets[2],
FrameHeader->Destination.Octets[3],
FrameHeader->Destination.Octets[4],
FrameHeader->Destination.Octets[5]);
printf_P(PSTR(" + Protocol: 0x%04x\r\n"), SwapEndian_16(FrameHeader->EtherType));
#endif
}
/** Decodes an ARP header and prints its contents to through the USART in a human readable format.
*
* \param[in] InDataStart Pointer to the start of an ARP packet header
*/
void DecodeARPHeader(void* InDataStart)
{
#if !defined(NO_DECODE_ARP)
ARP_Header_t* ARPHeader = (ARP_Header_t*)InDataStart;
printf_P(PSTR(" \\\r\n ARP\r\n"));
if (!(IP_COMPARE(&ARPHeader->TPA, &ServerIPAddress)) &&
!(MAC_COMPARE(&ARPHeader->THA, &ServerMACAddress)))
{
printf_P(PSTR(" + NOT ADDRESSED TO DEVICE\r\n"));
return;
}
printf_P(PSTR(" + Protocol: %x\r\n"), SwapEndian_16(ARPHeader->ProtocolType));
printf_P(PSTR(" + Operation: %u\r\n"), SwapEndian_16(ARPHeader->Operation));
if (SwapEndian_16(ARPHeader->ProtocolType) == ETHERTYPE_IPV4)
{
printf_P(PSTR(" + SHA MAC: %02X:%02X:%02X:%02X:%02X:%02X\r\n"), ARPHeader->SHA.Octets[0],
ARPHeader->SHA.Octets[1],
ARPHeader->SHA.Octets[2],
ARPHeader->SHA.Octets[3],
ARPHeader->SHA.Octets[4],
ARPHeader->SHA.Octets[5]);
printf_P(PSTR(" + SPA IP: %u.%u.%u.%u\r\n"), ARPHeader->SPA.Octets[0],
ARPHeader->SPA.Octets[1],
ARPHeader->SPA.Octets[2],
ARPHeader->SPA.Octets[3]);
printf_P(PSTR(" + THA MAC: %02X:%02X:%02X:%02X:%02X:%02X\r\n"), ARPHeader->THA.Octets[0],
ARPHeader->THA.Octets[1],
ARPHeader->THA.Octets[2],
ARPHeader->THA.Octets[3],
ARPHeader->THA.Octets[4],
ARPHeader->THA.Octets[5]);
printf_P(PSTR(" + TPA IP: %u.%u.%u.%u\r\n"), ARPHeader->TPA.Octets[0],
ARPHeader->TPA.Octets[1],
ARPHeader->TPA.Octets[2],
ARPHeader->TPA.Octets[3]);
}
#endif
}
/** Decodes an IP header and prints its contents to through the USART in a human readable format.
*
* \param[in] InDataStart Pointer to the start of an IP packet header
*/
void DecodeIPHeader(void* InDataStart)
{
#if !defined(NO_DECODE_IP)
IP_Header_t* IPHeader = (IP_Header_t*)InDataStart;
uint16_t HeaderLengthBytes = (IPHeader->HeaderLength * sizeof(uint32_t));
printf_P(PSTR(" \\\r\n IP\r\n"));
if (!(IP_COMPARE(&IPHeader->DestinationAddress, &ServerIPAddress)))
{
printf_P(PSTR(" + NOT ADDRESSED TO DEVICE\r\n"));
return;
}
printf_P(PSTR(" + Header Length: %u Bytes\r\n"), HeaderLengthBytes);
printf_P(PSTR(" + Packet Version: %u\r\n"), IPHeader->Version);
printf_P(PSTR(" + Total Length: %u\r\n"), SwapEndian_16(IPHeader->TotalLength));
printf_P(PSTR(" + Protocol: %u\r\n"), IPHeader->Protocol);
printf_P(PSTR(" + TTL: %u\r\n"), IPHeader->TTL);
printf_P(PSTR(" + IP Src: %u.%u.%u.%u\r\n"), IPHeader->SourceAddress.Octets[0],
IPHeader->SourceAddress.Octets[1],
IPHeader->SourceAddress.Octets[2],
IPHeader->SourceAddress.Octets[3]);
printf_P(PSTR(" + IP Dst: %u.%u.%u.%u\r\n"), IPHeader->DestinationAddress.Octets[0],
IPHeader->DestinationAddress.Octets[1],
IPHeader->DestinationAddress.Octets[2],
IPHeader->DestinationAddress.Octets[3]);
#endif
}
/** Decodes an ICMP header and prints its contents to through the USART in a human readable format.
*
* \param[in] InDataStart Pointer to the start of an ICMP packet header
*/
void DecodeICMPHeader(void* InDataStart)
{
#if !defined(NO_DECODE_ICMP)
ICMP_Header_t* ICMPHeader = (ICMP_Header_t*)InDataStart;
printf_P(PSTR(" \\\r\n ICMP\r\n"));
printf_P(PSTR(" + Type: %u\r\n"), ICMPHeader->Type);
printf_P(PSTR(" + Code: %u\r\n"), ICMPHeader->Code);
#endif
}
/** Decodes a TCP header and prints its contents to through the USART in a human readable format.
*
* \param[in] InDataStart Pointer to the start of a TCP packet header
*/
void DecodeTCPHeader(void* InDataStart)
{
#if !defined(NO_DECODE_TCP)
TCP_Header_t* TCPHeader = (TCP_Header_t*)InDataStart;
uint16_t HeaderLengthBytes = (TCPHeader->DataOffset * sizeof(uint32_t));
printf_P(PSTR(" \\\r\n TCP\r\n"));
printf_P(PSTR(" + Header Length: %u Bytes\r\n"), HeaderLengthBytes);
printf_P(PSTR(" + Source Port: %u\r\n"), SwapEndian_16(TCPHeader->SourcePort));
printf_P(PSTR(" + Destination Port: %u\r\n"), SwapEndian_16(TCPHeader->DestinationPort));
printf_P(PSTR(" + Sequence Number: %lu\r\n"), SwapEndian_32(TCPHeader->SequenceNumber));
printf_P(PSTR(" + Acknowledgment Number: %lu\r\n"), SwapEndian_32(TCPHeader->AcknowledgmentNumber));
printf_P(PSTR(" + Flags: 0x%02X\r\n"), TCPHeader->Flags);
if (TCP_GetPortState(TCPHeader->DestinationPort) == TCP_Port_Closed)
printf_P(PSTR(" + NOT LISTENING ON DESTINATION PORT\r\n"));
#endif
}
/** Decodes an UDP header and prints its contents to through the USART in a human readable format.
*
* \param[in] InDataStart Pointer to the start of a UDP packet header
*/
void DecodeUDPHeader(void* InDataStart)
{
#if !defined(NO_DECODE_UDP)
UDP_Header_t* UDPHeader = (UDP_Header_t*)InDataStart;
printf_P(PSTR(" \\\r\n UDP\r\n"));
printf_P(PSTR(" + Source Port: %u\r\n"), SwapEndian_16(UDPHeader->SourcePort));
printf_P(PSTR(" + Destination Port: %u\r\n"), SwapEndian_16(UDPHeader->DestinationPort));
printf_P(PSTR(" + Data Length: %d\r\n"), SwapEndian_16(UDPHeader->Length));
#endif
}
/** Decodes an DHCP header and prints its contents to through the USART in a human readable format.
*
* \param[in] InDataStart Pointer to the start of a DHCP packet header
*/
void DecodeDHCPHeader(void* InDataStart)
{
#if !defined(NO_DECODE_DHCP)
uint8_t* DHCPOptions = ((uint8_t*)InDataStart + sizeof(DHCP_Header_t));
printf_P(PSTR(" \\\r\n DHCP\r\n"));
while (DHCPOptions[0] != DHCP_OPTION_END)
{
if (DHCPOptions[0] == DHCP_OPTION_MESSAGETYPE)
{
switch (DHCPOptions[2])
{
case DHCP_MESSAGETYPE_DISCOVER:
printf_P(PSTR(" + DISCOVER\r\n"));
break;
case DHCP_MESSAGETYPE_REQUEST:
printf_P(PSTR(" + REQUEST\r\n"));
break;
case DHCP_MESSAGETYPE_RELEASE:
printf_P(PSTR(" + RELEASE\r\n"));
break;
case DHCP_MESSAGETYPE_DECLINE:
printf_P(PSTR(" + DECLINE\r\n"));
break;
}
}
DHCPOptions += ((DHCPOptions[0] == DHCP_OPTION_PAD) ? 1 : (DHCPOptions[1] + 2));
}
#endif
}
|
