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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
12 #include "cmdlfpcf7931.h"
13
14 #include <stdio.h>
15 #include <string.h>
16 #include "comms.h"
17 #include "ui.h"
18 #include "util.h"
19 #include "graph.h"
20 #include "cmdparser.h"
21 #include "cmddata.h"
22 #include "cmdmain.h"
23 #include "cmdlf.h"
24
25 static int CmdHelp(const char *Cmd);
26
27 #define PCF7931_DEFAULT_INITDELAY 17500
28 #define PCF7931_DEFAULT_OFFSET_WIDTH 0
29 #define PCF7931_DEFAULT_OFFSET_POSITION 0
30
31 // Default values - Configuration
32 struct pcf7931_config configPcf = {
33 {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF},
34 PCF7931_DEFAULT_INITDELAY,
35 PCF7931_DEFAULT_OFFSET_WIDTH,
36 PCF7931_DEFAULT_OFFSET_POSITION
37 };
38
39 // Resets the configuration settings to default values.
40 int pcf7931_resetConfig(){
41 memset(configPcf.Pwd, 0xFF, sizeof(configPcf.Pwd) );
42 configPcf.InitDelay = PCF7931_DEFAULT_INITDELAY;
43 configPcf.OffsetWidth = PCF7931_DEFAULT_OFFSET_WIDTH;
44 configPcf.OffsetPosition = PCF7931_DEFAULT_OFFSET_POSITION;
45 return 0;
46 }
47
48 int pcf7931_printConfig(){
49 PrintAndLog("Password (LSB first on bytes) : %s", sprint_hex( configPcf.Pwd, sizeof(configPcf.Pwd)));
50 PrintAndLog("Tag initialization delay : %d us", configPcf.InitDelay);
51 PrintAndLog("Offset low pulses width : %d us", configPcf.OffsetWidth);
52 PrintAndLog("Offset low pulses position : %d us", configPcf.OffsetPosition);
53 return 0;
54 }
55
56 int usage_pcf7931_read(){
57 PrintAndLog("Usage: lf pcf7931 read [h] ");
58 PrintAndLog("This command tries to read a PCF7931 tag.");
59 PrintAndLog("Options:");
60 PrintAndLog(" h This help");
61 PrintAndLog("Examples:");
62 PrintAndLog(" lf pcf7931 read");
63 return 0;
64 }
65
66 int usage_pcf7931_write(){
67 PrintAndLog("Usage: lf pcf7931 write [h] <block address> <byte address> <data>");
68 PrintAndLog("This command tries to write a PCF7931 tag.");
69 PrintAndLog("Options:");
70 PrintAndLog(" h This help");
71 PrintAndLog(" blockaddress Block to save [0-7]");
72 PrintAndLog(" byteaddress Index of byte inside block to write [0-15]");
73 PrintAndLog(" data one byte of data (hex)");
74 PrintAndLog("Examples:");
75 PrintAndLog(" lf pcf7931 write 2 1 FF");
76 return 0;
77 }
78
79 int usage_pcf7931_config(){
80 PrintAndLog("Usage: lf pcf7931 config [h] [r] <pwd> <delay> <offset width> <offset position>");
81 PrintAndLog("This command tries to set the configuration used with PCF7931 commands");
82 PrintAndLog("The time offsets could be useful to correct slew rate generated by the antenna");
83 PrintAndLog("Caling without some parameter will print the current configuration.");
84 PrintAndLog("Options:");
85 PrintAndLog(" h This help");
86 PrintAndLog(" r Reset configuration to default values");
87 PrintAndLog(" pwd Password, hex, 7bytes, LSB-order");
88 PrintAndLog(" delay Tag initialization delay (in us) decimal");
89 PrintAndLog(" offset Low pulses width (in us) decimal");
90 PrintAndLog(" offset Low pulses position (in us) decimal");
91 PrintAndLog("Examples:");
92 PrintAndLog(" lf pcf7931 config");
93 PrintAndLog(" lf pcf7931 config r");
94 PrintAndLog(" lf pcf7931 config 11223344556677 20000");
95 PrintAndLog(" lf pcf7931 config 11223344556677 17500 -10 30");
96 return 0;
97 }
98
99 int CmdLFPCF7931Read(const char *Cmd){
100
101 uint8_t ctmp = param_getchar(Cmd, 0);
102 if ( ctmp == 'H' || ctmp == 'h' ) return usage_pcf7931_read();
103
104 UsbCommand resp;
105 UsbCommand c = {CMD_PCF7931_READ, {0, 0, 0}};
106 clearCommandBuffer();
107 SendCommand(&c);
108 if ( !WaitForResponseTimeout(CMD_ACK, &resp, 2500) ) {
109 PrintAndLog("command execution time out");
110 return 1;
111 }
112 return 0;
113 }
114
115 int CmdLFPCF7931Config(const char *Cmd){
116
117 uint8_t ctmp = param_getchar(Cmd, 0);
118 if ( ctmp == 0) return pcf7931_printConfig();
119 if ( ctmp == 'H' || ctmp == 'h' ) return usage_pcf7931_config();
120 if ( ctmp == 'R' || ctmp == 'r' ) return pcf7931_resetConfig();
121
122 if ( param_gethex(Cmd, 0, configPcf.Pwd, 14) ) return usage_pcf7931_config();
123
124 configPcf.InitDelay = (param_get32ex(Cmd,1,0,10) & 0xFFFF);
125 configPcf.OffsetWidth = (int)(param_get32ex(Cmd,2,0,10) & 0xFFFF);
126 configPcf.OffsetPosition = (int)(param_get32ex(Cmd,3,0,10) & 0xFFFF);
127
128 pcf7931_printConfig();
129 return 0;
130 }
131
132 int CmdLFPCF7931Write(const char *Cmd){
133
134 uint8_t ctmp = param_getchar(Cmd, 0);
135 if (strlen(Cmd) < 1 || ctmp == 'h' || ctmp == 'H') return usage_pcf7931_write();
136
137 uint8_t block = 0, bytepos = 0, data = 0;
138
139 if ( param_getdec(Cmd, 0, &block) ) return usage_pcf7931_write();
140 if ( param_getdec(Cmd, 1, &bytepos) ) return usage_pcf7931_write();
141
142 if ( (block > 7) || (bytepos > 15) ) return usage_pcf7931_write();
143
144 data = param_get8ex(Cmd, 2, 0, 16);
145
146 PrintAndLog("Writing block: %d", block);
147 PrintAndLog(" pos: %d", bytepos);
148 PrintAndLog(" data: 0x%02X", data);
149
150 UsbCommand c = {CMD_PCF7931_WRITE, { block, bytepos, data} };
151 memcpy(c.d.asDwords, configPcf.Pwd, sizeof(configPcf.Pwd) );
152 c.d.asDwords[7] = (configPcf.OffsetWidth + 128);
153 c.d.asDwords[8] = (configPcf.OffsetPosition + 128);
154 c.d.asDwords[9] = configPcf.InitDelay;
155
156 clearCommandBuffer();
157 SendCommand(&c);
158 //no ack?
159 return 0;
160 }
161
162 static command_t CommandTable[] =
163 {
164 {"help", CmdHelp, 1, "This help"},
165 {"read", CmdLFPCF7931Read, 0, "Read content of a PCF7931 transponder"},
166 {"write", CmdLFPCF7931Write, 0, "Write data on a PCF7931 transponder."},
167 {"config", CmdLFPCF7931Config, 1, "Configure the password, the tags initialization delay and time offsets (optional)"},
168 {NULL, NULL, 0, NULL}
169 };
170
171 int CmdLFPCF7931(const char *Cmd)
172 {
173 CmdsParse(CommandTable, Cmd);
174 return 0;
175 }
176
177 int CmdHelp(const char *Cmd)
178 {
179 CmdsHelp(CommandTable);
180 return 0;
181 }
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