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