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1 //-----------------------------------------------------------------------------
2 //
3 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
4 // at your option, any later version. See the LICENSE.txt file for the text of
5 // the license.
6 //-----------------------------------------------------------------------------
7 // Low frequency Stanley/PAC tag commands
8 // NRZ, RF/32, 128 bits long (unknown cs)
9 //-----------------------------------------------------------------------------
10
11 #include "cmdlfpac.h"
12
13 #include <string.h>
14 #include <inttypes.h>
15 #include "comms.h"
16 #include "ui.h"
17 #include "util.h"
18 #include "graph.h"
19 #include "cmdparser.h"
20 #include "cmddata.h"
21 #include "cmdmain.h"
22 #include "cmdlf.h"
23 #include "lfdemod.h" // preamble test
24
25 static int CmdHelp(const char *Cmd);
26
27 // by marshmellow
28 // find PAC preamble in already demoded data
29 int PacFind(uint8_t *dest, size_t *size) {
30 if (*size < 128) return -1; //make sure buffer has data
31 size_t startIdx = 0;
32 uint8_t preamble[] = {1,1,1,1,1,1,1,1,0,0,1,0,0,0,0,0,0,1,0};
33 if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
34 return -2; //preamble not found
35 if (*size != 128) return -3; //wrong demoded size
36 //return start position
37 return (int)startIdx;
38 }
39
40 //see NRZDemod for what args are accepted
41 int CmdPacDemod(const char *Cmd) {
42
43 //NRZ
44 if (!NRZrawDemod(Cmd, false)) {
45 if (g_debugMode) PrintAndLog("DEBUG: Error - PAC: NRZ Demod failed");
46 return 0;
47 }
48 size_t size = DemodBufferLen;
49 int ans = PacFind(DemodBuffer, &size);
50 if (ans < 0) {
51 if (g_debugMode) {
52 if (ans == -1)
53 PrintAndLog("DEBUG: Error - PAC: too few bits found");
54 else if (ans == -2)
55 PrintAndLog("DEBUG: Error - PAC: preamble not found");
56 else if (ans == -3)
57 PrintAndLog("DEBUG: Error - PAC: Size not correct: %d", size);
58 else
59 PrintAndLog("DEBUG: Error - PAC: ans: %d", ans);
60 }
61 return 0;
62 }
63 setDemodBuf(DemodBuffer, 128, ans);
64 setClockGrid(g_DemodClock, g_DemodStartIdx + (ans*g_DemodClock));
65
66 //got a good demod
67 uint32_t raw1 = bytebits_to_byte(DemodBuffer , 32);
68 uint32_t raw2 = bytebits_to_byte(DemodBuffer+32, 32);
69 uint32_t raw3 = bytebits_to_byte(DemodBuffer+64, 32);
70 uint32_t raw4 = bytebits_to_byte(DemodBuffer+96, 32);
71
72 // preamble then appears to have marker bits of "10" CS?
73 // 11111111001000000 10 01001100 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 10001100 10 100000001
74 // unknown checksum 9 bits at the end
75
76 PrintAndLog("PAC/Stanley Tag Found -- Raw: %08X%08X%08X%08X", raw1 ,raw2, raw3, raw4);
77 PrintAndLog("\nHow the Raw ID is translated by the reader is unknown");
78 return 1;
79 }
80
81 int CmdPacRead(const char *Cmd) {
82 lf_read(true, 4096*2 + 20);
83 return CmdPacDemod(Cmd);
84 }
85
86 static command_t CommandTable[] = {
87 {"help", CmdHelp, 1, "This help"},
88 {"demod", CmdPacDemod,1, "Attempt to read and extract tag data from the GraphBuffer"},
89 {"read", CmdPacRead, 0, "Attempt to read and extract tag data from the antenna"},
90 {NULL, NULL, 0, NULL}
91 };
92
93 int CmdLFPac(const char *Cmd) {
94 clearCommandBuffer();
95 CmdsParse(CommandTable, Cmd);
96 return 0;
97 }
98
99 int CmdHelp(const char *Cmd) {
100 CmdsHelp(CommandTable);
101 return 0;
102 }
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