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1 //-----------------------------------------------------------------------------
2 // Copyright (C) 2012 Chalk <chalk.secu at gmail.com>
3 // 2015 Dake <thomas.cayrou at gmail.com>
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 // Low frequency PCF7931 commands
10 //-----------------------------------------------------------------------------
11 #include <stdio.h>
12 #include <string.h>
13 #include "proxmark3.h"
14 #include "ui.h"
15 #include "graph.h"
16 #include "cmdparser.h"
17 #include "cmddata.h"
18 #include "cmdmain.h"
19 #include "cmdlf.h"
20 #include "cmdlfpcf7931.h"
21
22 static int CmdHelp(const char *Cmd);
23
24 #define PCF7931_DEFAULT_INITDELAY 17500
25 #define PCF7931_DEFAULT_OFFSET_WIDTH 0
26 #define PCF7931_DEFAULT_OFFSET_POSITION 0
27
28 // Default values - Configuration
29 struct pcf7931_config configPcf = {
30 {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF},
31 PCF7931_DEFAULT_INITDELAY,
32 PCF7931_DEFAULT_OFFSET_WIDTH,
33 PCF7931_DEFAULT_OFFSET_POSITION
34 };
35
36 // Resets the configuration settings to default values.
37 int pcf7931_resetConfig(){
38 memset(configPcf.Pwd, 0xFF, sizeof(configPcf.Pwd) );
39 configPcf.InitDelay = PCF7931_DEFAULT_INITDELAY;
40 configPcf.OffsetWidth = PCF7931_DEFAULT_OFFSET_WIDTH;
41 configPcf.OffsetPosition = PCF7931_DEFAULT_OFFSET_POSITION;
42 return 0;
43 }
44
45 int pcf7931_printConfig(){
46 PrintAndLog("Password (LSB first on bytes) : %s", sprint_hex( configPcf.Pwd, sizeof(configPcf.Pwd)));
47 PrintAndLog("Tag initialization delay : %d us", configPcf.InitDelay);
48 PrintAndLog("Offset low pulses width : %d us", configPcf.OffsetWidth);
49 PrintAndLog("Offset low pulses position : %d us", configPcf.OffsetPosition);
50 return 0;
51 }
52
53 int usage_pcf7931_read(){
54 PrintAndLog("Usage: lf pcf7931 read [h] ");
55 PrintAndLog("This command tries to read a PCF7931 tag.");
56 PrintAndLog("Options:");
57 PrintAndLog(" h This help");
58 PrintAndLog("Examples:");
59 PrintAndLog(" lf pcf7931 read");
60 return 0;
61 }
62
63 int usage_pcf7931_write(){
64 PrintAndLog("Usage: lf pcf7931 write [h] <block address> <byte address> <data>");
65 PrintAndLog("This command tries to write a PCF7931 tag.");
66 PrintAndLog("Options:");
67 PrintAndLog(" h This help");
68 PrintAndLog(" blockaddress Block to save [0-7]");
69 PrintAndLog(" byteaddress Index of byte inside block to write [0-15]");
70 PrintAndLog(" data one byte of data (hex)");
71 PrintAndLog("Examples:");
72 PrintAndLog(" lf pcf7931 write 2 1 FF");
73 return 0;
74 }
75
76 int usage_pcf7931_config(){
77 PrintAndLog("Usage: lf pcf7931 config [h] [r] <pwd> <delay> <offset width> <offset position>");
78 PrintAndLog("This command tries to set the configuration used with PCF7931 commands");
79 PrintAndLog("The time offsets could be useful to correct slew rate generated by the antenna");
80 PrintAndLog("Caling without some parameter will print the current configuration.");
81 PrintAndLog("Options:");
82 PrintAndLog(" h This help");
83 PrintAndLog(" r Reset configuration to default values");
84 PrintAndLog(" pwd Password, hex, 7bytes, LSB-order");
85 PrintAndLog(" delay Tag initialization delay (in us) decimal");
86 PrintAndLog(" offset Low pulses width (in us) decimal");
87 PrintAndLog(" offset Low pulses position (in us) decimal");
88 PrintAndLog("Examples:");
89 PrintAndLog(" lf pcf7931 config");
90 PrintAndLog(" lf pcf7931 config r");
91 PrintAndLog(" lf pcf7931 config 11223344556677 20000");
92 PrintAndLog(" lf pcf7931 config 11223344556677 17500 -10 30");
93 return 0;
94 }
95
96 int CmdLFPCF7931Read(const char *Cmd){
97
98 uint8_t ctmp = param_getchar(Cmd, 0);
99 if ( ctmp == 'H' || ctmp == 'h' ) return usage_pcf7931_read();
100
101 UsbCommand resp;
102 UsbCommand c = {CMD_PCF7931_READ, {0, 0, 0}};
103 clearCommandBuffer();
104 SendCommand(&c);
105 if ( !WaitForResponseTimeout(CMD_ACK, &resp, 2500) ) {
106 PrintAndLog("command execution time out");
107 return 1;
108 }
109 return 0;
110 }
111
112 int CmdLFPCF7931Config(const char *Cmd){
113
114 uint8_t ctmp = param_getchar(Cmd, 0);
115 if ( ctmp == 0) return pcf7931_printConfig();
116 if ( ctmp == 'H' || ctmp == 'h' ) return usage_pcf7931_config();
117 if ( ctmp == 'R' || ctmp == 'r' ) return pcf7931_resetConfig();
118
119 if ( param_gethex(Cmd, 0, configPcf.Pwd, 14) ) return usage_pcf7931_config();
120
121 configPcf.InitDelay = (param_get32ex(Cmd,1,0,10) & 0xFFFF);
122 configPcf.OffsetWidth = (int)(param_get32ex(Cmd,2,0,10) & 0xFFFF);
123 configPcf.OffsetPosition = (int)(param_get32ex(Cmd,3,0,10) & 0xFFFF);
124
125 pcf7931_printConfig();
126 return 0;
127 }
128
129 int CmdLFPCF7931Write(const char *Cmd){
130
131 uint8_t ctmp = param_getchar(Cmd, 0);
132 if (strlen(Cmd) < 1 || ctmp == 'h' || ctmp == 'H') return usage_pcf7931_write();
133
134 uint8_t block = 0, bytepos = 0, data = 0;
135
136 if ( param_getdec(Cmd, 0, &block) ) return usage_pcf7931_write();
137 if ( param_getdec(Cmd, 1, &bytepos) ) return usage_pcf7931_write();
138
139 if ( (block > 7) || (bytepos > 15) ) return usage_pcf7931_write();
140
141 data = param_get8ex(Cmd, 2, 0, 16);
142
143 PrintAndLog("Writing block: %d", block);
144 PrintAndLog(" pos: %d", bytepos);
145 PrintAndLog(" data: 0x%02X", data);
146
147 UsbCommand c = {CMD_PCF7931_WRITE, { block, bytepos, data} };
148 memcpy(c.d.asDwords, configPcf.Pwd, sizeof(configPcf.Pwd) );
149 c.d.asDwords[7] = (configPcf.OffsetWidth + 128);
150 c.d.asDwords[8] = (configPcf.OffsetPosition + 128);
151 c.d.asDwords[9] = configPcf.InitDelay;
152
153 clearCommandBuffer();
154 SendCommand(&c);
155 //no ack?
156 return 0;
157 }
158
159 static command_t CommandTable[] =
160 {
161 {"help", CmdHelp, 1, "This help"},
162 {"read", CmdLFPCF7931Read, 0, "Read content of a PCF7931 transponder"},
163 {"write", CmdLFPCF7931Write, 0, "Write data on a PCF7931 transponder."},
164 {"config", CmdLFPCF7931Config, 1, "Configure the password, the tags initialization delay and time offsets (optional)"},
165 {NULL, NULL, 0, NULL}
166 };
167
168 int CmdLFPCF7931(const char *Cmd) {
169 clearCommandBuffer();
170 CmdsParse(CommandTable, Cmd);
171 return 0;
172 }
173
174 int CmdHelp(const char *Cmd) {
175 CmdsHelp(CommandTable);
176 return 0;
177 }
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