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1 //-----------------------------------------------------------------------------
2 // Jonathan Westhues, Aug 2005
3 // Gerhard de Koning Gans, April 2008, May 2011
4 //
5 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
6 // at your option, any later version. See the LICENSE.txt file for the text of
7 // the license.
8 //-----------------------------------------------------------------------------
9 // BigBuf and functions to allocate/free parts of it.
10 //-----------------------------------------------------------------------------
11
12 #include <stdint.h>
13 #include "proxmark3.h"
14 #include "apps.h"
15 #include "string.h"
16 #include "util.h"
17
18 // BigBuf is the large multi-purpose buffer, typically used to hold A/D samples or traces.
19 // Also used to hold various smaller buffers and the Mifare Emulator Memory.
20
21 // declare it as uint32_t to achieve alignment to 4 Byte boundary
22 static uint32_t BigBuf[BIGBUF_SIZE/sizeof(uint32_t)];
23
24 // High memory mark
25 static uint16_t BigBuf_hi = BIGBUF_SIZE;
26
27 // pointer to the emulator memory.
28 static uint8_t *emulator_memory = NULL;
29
30 // trace related variables
31 static uint16_t traceLen = 0;
32 int tracing = 1; //Last global one.. todo static?
33
34 // get the address of BigBuf
35 uint8_t *BigBuf_get_addr(void)
36 {
37 return (uint8_t *)BigBuf;
38 }
39
40
41 // get the address of the emulator memory. Allocate part of Bigbuf for it, if not yet done
42 uint8_t *BigBuf_get_EM_addr(void)
43 {
44 if (emulator_memory == NULL) { // not yet allocated
45 emulator_memory = BigBuf_malloc(CARD_MEMORY_SIZE);
46 }
47
48 return emulator_memory;
49 }
50
51
52 // clear ALL of BigBuf
53 void BigBuf_Clear(void)
54 {
55 BigBuf_Clear_ext(true);
56 }
57 // clear ALL of BigBuf
58 void BigBuf_Clear_ext(bool verbose)
59 {
60 memset(BigBuf,0,BIGBUF_SIZE);
61 if (verbose)
62 Dbprintf("Buffer cleared (%i bytes)",BIGBUF_SIZE);
63 }
64
65 void BigBuf_Clear_keep_EM(void)
66 {
67 memset(BigBuf,0,BigBuf_hi);
68 }
69
70 // allocate a chunk of memory from BigBuf. We allocate high memory first. The unallocated memory
71 // at the beginning of BigBuf is always for traces/samples
72 uint8_t *BigBuf_malloc(uint16_t chunksize)
73 {
74 if (BigBuf_hi - chunksize < 0) {
75 return NULL; // no memory left
76 } else {
77 chunksize = (chunksize + 3) & 0xfffc; // round to next multiple of 4
78 BigBuf_hi -= chunksize; // aligned to 4 Byte boundary
79 return (uint8_t *)BigBuf + BigBuf_hi;
80 }
81 }
82
83
84 // free ALL allocated chunks. The whole BigBuf is available for traces or samples again.
85 void BigBuf_free(void)
86 {
87 BigBuf_hi = BIGBUF_SIZE;
88 emulator_memory = NULL;
89 }
90
91
92 // free allocated chunks EXCEPT the emulator memory
93 void BigBuf_free_keep_EM(void)
94 {
95 if (emulator_memory != NULL) {
96 BigBuf_hi = emulator_memory - (uint8_t *)BigBuf;
97 } else {
98 BigBuf_hi = BIGBUF_SIZE;
99 }
100 }
101
102 void BigBuf_print_status(void)
103 {
104 Dbprintf("Memory");
105 Dbprintf(" BIGBUF_SIZE.............%d", BIGBUF_SIZE);
106 Dbprintf(" BigBuf_hi .............%d", BigBuf_hi);
107 Dbprintf("Tracing");
108 Dbprintf(" tracing ................%d", tracing);
109 Dbprintf(" traceLen ...............%d", traceLen);
110 }
111
112
113 // return the maximum trace length (i.e. the unallocated size of BigBuf)
114 uint16_t BigBuf_max_traceLen(void)
115 {
116 return BigBuf_hi;
117 }
118
119 void clear_trace() {
120 traceLen = 0;
121 }
122
123 void set_tracing(bool enable) {
124 tracing = enable;
125 }
126
127 /**
128 * Get the number of bytes traced
129 * @return
130 */
131 uint16_t BigBuf_get_traceLen(void)
132 {
133 return traceLen;
134 }
135
136 /**
137 This is a function to store traces. All protocols can use this generic tracer-function.
138 The traces produced by calling this function can be fetched on the client-side
139 by 'hf list raw', alternatively 'hf list <proto>' for protocol-specific
140 annotation of commands/responses.
141
142 **/
143 bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
144 {
145 if (!tracing) return FALSE;
146
147 uint8_t *trace = BigBuf_get_addr();
148
149 uint16_t num_paritybytes = (iLen-1)/8 + 1; // number of valid paritybytes in *parity
150 uint16_t duration = timestamp_end - timestamp_start;
151
152 // Return when trace is full
153 uint16_t max_traceLen = BigBuf_max_traceLen();
154
155 if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= max_traceLen) {
156 tracing = FALSE; // don't trace any more
157 return FALSE;
158 }
159 // Traceformat:
160 // 32 bits timestamp (little endian)
161 // 16 bits duration (little endian)
162 // 16 bits data length (little endian, Highest Bit used as readerToTag flag)
163 // y Bytes data
164 // x Bytes parity (one byte per 8 bytes data)
165
166 // timestamp (start)
167 trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
168 trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
169 trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
170 trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
171
172 // duration
173 trace[traceLen++] = ((duration >> 0) & 0xff);
174 trace[traceLen++] = ((duration >> 8) & 0xff);
175
176 // data length
177 trace[traceLen++] = ((iLen >> 0) & 0xff);
178 trace[traceLen++] = ((iLen >> 8) & 0xff);
179
180 // readerToTag flag
181 if (!readerToTag) {
182 trace[traceLen - 1] |= 0x80;
183 }
184
185 // data bytes
186 if (btBytes != NULL && iLen != 0) {
187 memcpy(trace + traceLen, btBytes, iLen);
188 }
189 traceLen += iLen;
190
191 // parity bytes
192 if (num_paritybytes != 0) {
193 if (parity != NULL) {
194 memcpy(trace + traceLen, parity, num_paritybytes);
195 } else {
196 memset(trace + traceLen, 0x00, num_paritybytes);
197 }
198 }
199 traceLen += num_paritybytes;
200
201 return TRUE;
202 }
203
204
205 int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int readerToTag)
206 {
207 /**
208 Todo, rewrite the logger to use the generic functionality instead. It should be noted, however,
209 that this logger takes number of bits as argument, not number of bytes.
210 **/
211
212 if (!tracing) return FALSE;
213
214 uint8_t *trace = BigBuf_get_addr();
215 uint16_t iLen = nbytes(iBits);
216 // Return when trace is full
217 if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + iLen > BigBuf_max_traceLen()) return FALSE;
218
219 //Hitag traces appear to use this traceformat:
220 // 32 bits timestamp (little endian,Highest Bit used as readerToTag flag)
221 // 32 bits parity
222 // 8 bits size (number of bits in the trace entry, not number of bytes)
223 // y Bytes data
224
225 rsamples += iSamples;
226 trace[traceLen++] = ((rsamples >> 0) & 0xff);
227 trace[traceLen++] = ((rsamples >> 8) & 0xff);
228 trace[traceLen++] = ((rsamples >> 16) & 0xff);
229 trace[traceLen++] = ((rsamples >> 24) & 0xff);
230
231 if (!readerToTag) {
232 trace[traceLen - 1] |= 0x80;
233 }
234
235 trace[traceLen++] = ((dwParity >> 0) & 0xff);
236 trace[traceLen++] = ((dwParity >> 8) & 0xff);
237 trace[traceLen++] = ((dwParity >> 16) & 0xff);
238 trace[traceLen++] = ((dwParity >> 24) & 0xff);
239 trace[traceLen++] = iBits;
240
241 memcpy(trace + traceLen, btBytes, iLen);
242 traceLen += iLen;
243
244 return TRUE;
245 }
246
247
248 // Emulator memory
249 uint8_t emlSet(uint8_t *data, uint32_t offset, uint32_t length){
250 uint8_t* mem = BigBuf_get_EM_addr();
251 if(offset+length < CARD_MEMORY_SIZE)
252 {
253 memcpy(mem+offset, data, length);
254 return 0;
255 }else
256 {
257 Dbprintf("Error, trying to set memory outside of bounds! %d > %d", (offset+length), CARD_MEMORY_SIZE);
258 return 1;
259 }
260 }
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