client/cmdlfpcf7931.c

   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 }