git.zerfleddert.de Git - proxmark3-svn/blob

1 //-----------------------------------------------------------------------------

3 // 2015 Dake <thomas.cayrou at gmail.com>

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"

 static int CmdHelp(const char *Cmd);

25 #define PCF7931_DEFAULT_INITDELAY 17500

26 #define PCF7931_DEFAULT_OFFSET_WIDTH 0

27 #define PCF7931_DEFAULT_OFFSET_POSITION 0

29 // Default values - Configuration

30 struct pcf7931_config configPcf = {

         {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF},

32 PCF7931_DEFAULT_INITDELAY,

33 PCF7931_DEFAULT_OFFSET_WIDTH,

34 PCF7931_DEFAULT_OFFSET_POSITION

35 };

37 // Resets the configuration settings to default values.

38 int pcf7931_resetConfig(){

         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 }

46 int pcf7931_printConfig(){

         PrintAndLog("Password (LSB first on bytes) : %s", sprint_hex( configPcf.Pwd, sizeof(configPcf.Pwd)));

         PrintAndLog("Tag initialization delay      : %d us", configPcf.InitDelay);

         PrintAndLog("Offset low pulses width       : %d us", configPcf.OffsetWidth);

         PrintAndLog("Offset low pulses position    : %d us", configPcf.OffsetPosition);

51 return 0;

52 }

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 }

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 }

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 }

 int CmdLFPCF7931Read(const char *Cmd){  

         uint8_t ctmp = param_getchar(Cmd, 0);

         if ( ctmp == 'H' || ctmp == 'h' ) return usage_pcf7931_read();

101

102 UsbCommand resp;

         UsbCommand c = {CMD_PCF7931_READ, {0, 0, 0}};

104 clearCommandBuffer();

105 SendCommand(&c);

         if ( !WaitForResponseTimeout(CMD_ACK, &resp, 2500) ) {

107 PrintAndLog("command execution time out");

108 return 1;

109 }

110 return 0;

111 }

112

 int CmdLFPCF7931Config(const char *Cmd){ 

114

         uint8_t ctmp = param_getchar(Cmd, 0);

         if ( ctmp == 0) return pcf7931_printConfig();

         if ( ctmp == 'H' || ctmp == 'h' ) return usage_pcf7931_config();

         if ( ctmp == 'R' || ctmp == 'r' ) return pcf7931_resetConfig(); 

119

         if ( param_gethex(Cmd, 0, configPcf.Pwd, 14) ) return usage_pcf7931_config();

121

         configPcf.InitDelay = (param_get32ex(Cmd,1,0,10) & 0xFFFF);

         configPcf.OffsetWidth = (int)(param_get32ex(Cmd,2,0,10) & 0xFFFF);

         configPcf.OffsetPosition = (int)(param_get32ex(Cmd,3,0,10) & 0xFFFF);

125

126 pcf7931_printConfig();

127 return 0;

128 }

129

 int CmdLFPCF7931Write(const char *Cmd){

131

         uint8_t ctmp = param_getchar(Cmd, 0);

         if (strlen(Cmd) < 1 || ctmp == 'h' || ctmp == 'H') return usage_pcf7931_write();  

134

         uint8_t block = 0, bytepos = 0, data = 0;

136

         if ( param_getdec(Cmd, 0, &block) ) return usage_pcf7931_write();

         if ( param_getdec(Cmd, 1, &bytepos) ) return usage_pcf7931_write();

139

         if ( (block > 7) || (bytepos > 15) ) return usage_pcf7931_write();

141

         data  = param_get8ex(Cmd, 2, 0, 16);

143

         PrintAndLog("Writing block: %d", block);

         PrintAndLog("          pos: %d", bytepos);

         PrintAndLog("         data: 0x%02X", data);

147

         UsbCommand c = {CMD_PCF7931_WRITE, { block, bytepos, data} };

         memcpy(c.d.asDwords, configPcf.Pwd, sizeof(configPcf.Pwd) );

           c.d.asDwords[7] = (configPcf.OffsetWidth + 128);

           c.d.asDwords[8] = (configPcf.OffsetPosition + 128);

           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 {

         {"help",   CmdHelp,            1, "This help"},

         {"read",   CmdLFPCF7931Read,   0, "Read content of a PCF7931 transponder"},

         {"write",  CmdLFPCF7931Write,  0, "Write data on a PCF7931 transponder."},

         {"config", CmdLFPCF7931Config, 1, "Configure the password, the tags initialization delay and time offsets (optional)"},

         {NULL,     NULL,               0, NULL}

167 };

168

 int CmdLFPCF7931(const char *Cmd)

170 {

171 CmdsParse(CommandTable, Cmd);

172 return 0;

173 }

174

 int CmdHelp(const char *Cmd)

176 {

177 CmdsHelp(CommandTable);

178 return 0;

179 }