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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 "util.h"
16 #include "graph.h"
17 #include "cmdparser.h"
18 #include "cmddata.h"
19 #include "cmdmain.h"
20 #include "cmdlf.h"
21 #include "cmdlfpcf7931.h"
22
23 static int CmdHelp(const char *Cmd);
24
25 #define PCF7931_DEFAULT_INITDELAY 17500
26 #define PCF7931_DEFAULT_OFFSET_WIDTH 0
27 #define PCF7931_DEFAULT_OFFSET_POSITION 0
28
29 // Default values - Configuration
30 struct pcf7931_config configPcf = {
31 {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF},
32 PCF7931_DEFAULT_INITDELAY,
33 PCF7931_DEFAULT_OFFSET_WIDTH,
34 PCF7931_DEFAULT_OFFSET_POSITION
35 };
36
37 // Resets the configuration settings to default values.
38 int pcf7931_resetConfig(){
39 memset(configPcf.Pwd, 0xFF, sizeof(configPcf.Pwd) );
40 configPcf.InitDelay = PCF7931_DEFAULT_INITDELAY;
41 configPcf.OffsetWidth = PCF7931_DEFAULT_OFFSET_WIDTH;
42 configPcf.OffsetPosition = PCF7931_DEFAULT_OFFSET_POSITION;
43 return 0;
44 }
45
46 int pcf7931_printConfig(){
47 PrintAndLog("Password (LSB first on bytes) : %s", sprint_hex( configPcf.Pwd, sizeof(configPcf.Pwd)));
48 PrintAndLog("Tag initialization delay : %d us", configPcf.InitDelay);
49 PrintAndLog("Offset low pulses width : %d us", configPcf.OffsetWidth);
50 PrintAndLog("Offset low pulses position : %d us", configPcf.OffsetPosition);
51 return 0;
52 }
53
54 int usage_pcf7931_read(){
55 PrintAndLog("Usage: lf pcf7931 read [h] ");
56 PrintAndLog("This command tries to read a PCF7931 tag.");
57 PrintAndLog("Options:");
58 PrintAndLog(" h This help");
59 PrintAndLog("Examples:");
60 PrintAndLog(" lf pcf7931 read");
61 return 0;
62 }
63
64 int usage_pcf7931_write(){
65 PrintAndLog("Usage: lf pcf7931 write [h] <block address> <byte address> <data>");
66 PrintAndLog("This command tries to write a PCF7931 tag.");
67 PrintAndLog("Options:");
68 PrintAndLog(" h This help");
69 PrintAndLog(" blockaddress Block to save [0-7]");
70 PrintAndLog(" byteaddress Index of byte inside block to write [0-15]");
71 PrintAndLog(" data one byte of data (hex)");
72 PrintAndLog("Examples:");
73 PrintAndLog(" lf pcf7931 write 2 1 FF");
74 return 0;
75 }
76
77 int usage_pcf7931_config(){
78 PrintAndLog("Usage: lf pcf7931 config [h] [r] <pwd> <delay> <offset width> <offset position>");
79 PrintAndLog("This command tries to set the configuration used with PCF7931 commands");
80 PrintAndLog("The time offsets could be useful to correct slew rate generated by the antenna");
81 PrintAndLog("Caling without some parameter will print the current configuration.");
82 PrintAndLog("Options:");
83 PrintAndLog(" h This help");
84 PrintAndLog(" r Reset configuration to default values");
85 PrintAndLog(" pwd Password, hex, 7bytes, LSB-order");
86 PrintAndLog(" delay Tag initialization delay (in us) decimal");
87 PrintAndLog(" offset Low pulses width (in us) decimal");
88 PrintAndLog(" offset Low pulses position (in us) decimal");
89 PrintAndLog("Examples:");
90 PrintAndLog(" lf pcf7931 config");
91 PrintAndLog(" lf pcf7931 config r");
92 PrintAndLog(" lf pcf7931 config 11223344556677 20000");
93 PrintAndLog(" lf pcf7931 config 11223344556677 17500 -10 30");
94 return 0;
95 }
96
97 int CmdLFPCF7931Read(const char *Cmd){
98
99 uint8_t ctmp = param_getchar(Cmd, 0);
100 if ( ctmp == 'H' || ctmp == 'h' ) return usage_pcf7931_read();
101
102 UsbCommand resp;
103 UsbCommand c = {CMD_PCF7931_READ, {0, 0, 0}};
104 clearCommandBuffer();
105 SendCommand(&c);
106 if ( !WaitForResponseTimeout(CMD_ACK, &resp, 2500) ) {
107 PrintAndLog("command execution time out");
108 return 1;
109 }
110 return 0;
111 }
112
113 int CmdLFPCF7931Config(const char *Cmd){
114
115 uint8_t ctmp = param_getchar(Cmd, 0);
116 if ( ctmp == 0) return pcf7931_printConfig();
117 if ( ctmp == 'H' || ctmp == 'h' ) return usage_pcf7931_config();
118 if ( ctmp == 'R' || ctmp == 'r' ) return pcf7931_resetConfig();
119
120 if ( param_gethex(Cmd, 0, configPcf.Pwd, 14) ) return usage_pcf7931_config();
121
122 configPcf.InitDelay = (param_get32ex(Cmd,1,0,10) & 0xFFFF);
123 configPcf.OffsetWidth = (int)(param_get32ex(Cmd,2,0,10) & 0xFFFF);
124 configPcf.OffsetPosition = (int)(param_get32ex(Cmd,3,0,10) & 0xFFFF);
125
126 pcf7931_printConfig();
127 return 0;
128 }
129
130 int CmdLFPCF7931Write(const char *Cmd){
131
132 uint8_t ctmp = param_getchar(Cmd, 0);
133 if (strlen(Cmd) < 1 || ctmp == 'h' || ctmp == 'H') return usage_pcf7931_write();
134
135 uint8_t block = 0, bytepos = 0, data = 0;
136
137 if ( param_getdec(Cmd, 0, &block) ) return usage_pcf7931_write();
138 if ( param_getdec(Cmd, 1, &bytepos) ) return usage_pcf7931_write();
139
140 if ( (block > 7) || (bytepos > 15) ) return usage_pcf7931_write();
141
142 data = param_get8ex(Cmd, 2, 0, 16);
143
144 PrintAndLog("Writing block: %d", block);
145 PrintAndLog(" pos: %d", bytepos);
146 PrintAndLog(" data: 0x%02X", data);
147
148 UsbCommand c = {CMD_PCF7931_WRITE, { block, bytepos, data} };
149 memcpy(c.d.asDwords, configPcf.Pwd, sizeof(configPcf.Pwd) );
150 c.d.asDwords[7] = (configPcf.OffsetWidth + 128);
151 c.d.asDwords[8] = (configPcf.OffsetPosition + 128);
152 c.d.asDwords[9] = configPcf.InitDelay;
153
154 clearCommandBuffer();
155 SendCommand(&c);
156 //no ack?
157 return 0;
158 }
159
160 static command_t CommandTable[] =
161 {
162 {"help", CmdHelp, 1, "This help"},
163 {"read", CmdLFPCF7931Read, 0, "Read content of a PCF7931 transponder"},
164 {"write", CmdLFPCF7931Write, 0, "Write data on a PCF7931 transponder."},
165 {"config", CmdLFPCF7931Config, 1, "Configure the password, the tags initialization delay and time offsets (optional)"},
166 {NULL, NULL, 0, NULL}
167 };
168
169 int CmdLFPCF7931(const char *Cmd)
170 {
171 CmdsParse(CommandTable, Cmd);
172 return 0;
173 }
174
175 int CmdHelp(const char *Cmd)
176 {
177 CmdsHelp(CommandTable);
178 return 0;
179 }
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