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1 //-----------------------------------------------------------------------------
2 // Authored by Iceman
3 //
4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
5 // at your option, any later version. See the LICENSE.txt file for the text of
6 // the license.
7 //-----------------------------------------------------------------------------
8 // Low frequency COTAG commands
9 //-----------------------------------------------------------------------------
10 #include <stdio.h>
11 #include <string.h>
12 #include <stdint.h>
13 #include "proxmark3.h"
14 #include "ui.h"
15 #include "cmddata.h"
16 #include "data.h"
17 #include "cmdlfcotag.h"
18 #include "lfdemod.h"
19 #include "usb_cmd.h"
20 #include "cmdmain.h"
21
22 static int CmdHelp(const char *Cmd);
23
24 int usage_lf_cotag_read(void){
25 PrintAndLog("Usage: lf COTAG read [h] <signaldata>");
26 PrintAndLog("Options:");
27 PrintAndLog(" h : This help");
28 PrintAndLog(" <0|1|2> : 0 - HIGH/LOW signal; maxlength bigbuff");
29 PrintAndLog(" : 1 - translation of HI/LO into bytes with manchester 0,1");
30 PrintAndLog(" : 2 - raw signal; maxlength bigbuff");
31 PrintAndLog("");
32 PrintAndLog("Sample:");
33 PrintAndLog(" lf cotag read 0");
34 PrintAndLog(" lf cotag read 1");
35 return 0;
36 }
37
38 // COTAG demod should be able to use GraphBuffer,
39 // when data load samples
40 int CmdCOTAGDemod(const char *Cmd) {
41
42 uint8_t bits[COTAG_BITS] = {0};
43 size_t bitlen = COTAG_BITS;
44 memcpy(bits, DemodBuffer, COTAG_BITS);
45
46 uint8_t alignPos = 0;
47 int err = manrawdecode(bits, &bitlen, 1, &alignPos);
48 if (err){
49 if (g_debugMode) PrintAndLog("DEBUG: Error - COTAG too many errors: %d", err);
50 return -1;
51 }
52
53 setDemodBuf(bits, bitlen, 0);
54
55 //got a good demod
56 uint16_t cn = bytebits_to_byteLSBF(bits+1, 16);
57 uint32_t fc = bytebits_to_byteLSBF(bits+1+16, 8);
58
59 uint32_t raw1 = bytebits_to_byteLSBF(bits, 32);
60 uint32_t raw2 = bytebits_to_byteLSBF(bits+32, 32);
61 uint32_t raw3 = bytebits_to_byteLSBF(bits+64, 32);
62 uint32_t raw4 = bytebits_to_byteLSBF(bits+96, 32);
63
64 /*
65 fc 161: 1010 0001 -> LSB 1000 0101
66 cn 33593 1000 0011 0011 1001 -> LSB 1001 1100 1100 0001
67 cccc cccc cccc cccc ffffffff
68 0 1001 1100 1100 0001 1000 0101 0000 0000 100001010000000001111011100000011010000010000000000000000000000000000000000000000000000000000000100111001100000110000101000
69 1001 1100 1100 0001 10000101
70 */
71 PrintAndLog("COTAG Found: FC %u, CN: %u Raw: %08X%08X%08X%08X", fc, cn, raw1 ,raw2, raw3, raw4);
72 return 1;
73 }
74
75 // When reading a COTAG.
76 // 0 = HIGH/LOW signal - maxlength bigbuff
77 // 1 = translation for HI/LO into bytes with manchester 0,1 - length 300
78 // 2 = raw signal - maxlength bigbuff
79 int CmdCOTAGRead(const char *Cmd) {
80
81 if (Cmd[0] == 'h' || Cmd[0] == 'H') return usage_lf_cotag_read();
82
83 uint32_t rawsignal = 1;
84 sscanf(Cmd, "%u", &rawsignal);
85
86 UsbCommand c = {CMD_COTAG, {rawsignal, 0, 0}};
87 clearCommandBuffer();
88 SendCommand(&c);
89 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 7000) ) {
90 PrintAndLog("command execution time out");
91 return -1;
92 }
93
94 switch ( rawsignal ){
95 case 0:
96 case 2: {
97 CmdPlot("");
98 CmdGrid("384");
99 getSamples(0, true); break;
100 }
101 case 1: {
102 GetFromBigBuf(DemodBuffer, COTAG_BITS, 0);
103 DemodBufferLen = COTAG_BITS;
104 UsbCommand response;
105 if ( !WaitForResponseTimeout(CMD_ACK, &response, 1000) ) {
106 PrintAndLog("timeout while waiting for reply.");
107 return -1;
108 }
109 return CmdCOTAGDemod("");
110 }
111 }
112 return 0;
113 }
114
115 static command_t CommandTable[] = {
116 {"help", CmdHelp, 1, "This help"},
117 {"demod", CmdCOTAGDemod, 1, "Tries to decode a COTAG signal"},
118 {"read", CmdCOTAGRead, 0, "Attempt to read and extract tag data"},
119 {NULL, NULL, 0, NULL}
120 };
121
122 int CmdLFCOTAG(const char *Cmd) {
123 clearCommandBuffer();
124 CmdsParse(CommandTable, Cmd);
125 return 0;
126 }
127
128 int CmdHelp(const char *Cmd) {
129 CmdsHelp(CommandTable);
130 return 0;
131 }
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