]> cvs.zerfleddert.de Git - proxmark3-svn/blobdiff - client/cmdhf15.c
lf search use new psk, small demod adjustments
[proxmark3-svn] / client / cmdhf15.c
index 031075092a9af418bb98948b149a670d42d8c38d..b1e04e9ab7a4362725fc0e47b8e98fa826b36a38 100644 (file)
@@ -1,6 +1,7 @@
 //-----------------------------------------------------------------------------
 // Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
-// Modified 2010 by <adrian -at- atrox.at>
+// Modified 2010-2012 by <adrian -at- atrox.at>
+// Modified 2012 by <vsza at vsza.hu>
 //
 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
 // at your option, any later version. See the LICENSE.txt file for the text of
 #include <stdlib.h>
 #include <string.h>
 #include <stdint.h>
-#include "proxusb.h"
+
+#include "proxmark3.h"
 #include "data.h"
 #include "graph.h"
 #include "ui.h"
+#include "util.h"
 #include "cmdparser.h"
 #include "cmdhf15.h"
 #include "iso15693tools.h"
@@ -43,8 +46,6 @@
 #define AddCrc(data,datalen)  Iso15693AddCrc(data,datalen)
 #define sprintUID(target,uid)  Iso15693sprintUID(target,uid)
 
-static int CmdHelp(const char *Cmd);
-
 // structure and database for uid -> tagtype lookups 
 typedef struct { 
        uint64_t uid;
@@ -54,17 +55,21 @@ typedef struct {
 
 
 const productName uidmapping[] = {
+       // UID, #significant Bits, "Vendor(+Product)"
        { 0xE001000000000000LL, 16, "Motorola" },
        { 0xE002000000000000LL, 16, "ST Microelectronics" },
        { 0xE003000000000000LL, 16, "Hitachi" },
-       { 0xE004000000000000LL, 16, "Philips" },
-       { 0xE004010000000000LL, 24, "Philips; IC SL2 ICS20" },
+       { 0xE004000000000000LL, 16, "NXP(Philips)" },
+       { 0xE004010000000000LL, 24, "NXP(Philips); IC SL2 ICS20/ICS21(SLI) ICS2002/ICS2102(SLIX)" },
+       { 0xE004020000000000LL, 24, "NXP(Philips); IC SL2 ICS53/ICS54(SLI-S) ICS5302/ICS5402(SLIX-S)" },
+       { 0xE004030000000000LL, 24, "NXP(Philips); IC SL2 ICS50/ICS51(SLI-L) ICS5002/ICS5102(SLIX-L)" },
        { 0xE005000000000000LL, 16, "Infineon" },
        { 0xE005400000000000LL, 24, "Infineon; 56x32bit" },
        { 0xE006000000000000LL, 16, "Cylinc" },
        { 0xE007000000000000LL, 16, "Texas Instrument; " },
        { 0xE007000000000000LL, 20, "Texas Instrument; Tag-it HF-I Plus Inlay; 64x32bit" },
        { 0xE007100000000000LL, 20, "Texas Instrument; Tag-it HF-I Plus Chip; 64x32bit" },
+       { 0xE007800000000000LL, 23, "Texas Instrument; Tag-it HF-I Plus (RF-HDT-DVBB tag or Third Party Products)" },
        { 0xE007C00000000000LL, 23, "Texas Instrument; Tag-it HF-I Standard; 8x32bit" },
        { 0xE007C40000000000LL, 23, "Texas Instrument; Tag-it HF-I Pro; 8x23bit; password" },   
        { 0xE008000000000000LL, 16, "Fujitsu" },
@@ -78,8 +83,10 @@ const productName uidmapping[] = {
        { 0xE010000000000000LL, 16, "LG-Semiconductors" },
        { 0xE012000000000000LL, 16, "HID Corporation" },
        { 0xE016000000000000LL, 16, "EM-Marin SA (Skidata)" },
-       { 0xE016040000000000LL, 24, "EM-Marin SA (Skidata Keycard-eco); no memory" },
+       { 0xE016040000000000LL, 24, "EM-Marin SA (Skidata Keycard-eco); EM4034? no 'read', just 'readmulti'" },
+       { 0xE0160c0000000000LL, 24, "EM-Marin SA; EM4035?" },
        { 0xE016100000000000LL, 24, "EM-Marin SA (Skidata); EM4135; 36x64bit start page 13" },
+       { 0xE016940000000000LL, 24, "EM-Marin SA (Skidata); 51x64bit" },
        { 0,0,"no tag-info available" } // must be the last entry
 };
 
@@ -89,7 +96,7 @@ const productName uidmapping[] = {
 // returns 1 if suceeded
 int getUID(uint8_t *buf) 
 {
-       UsbCommand *r;  
+       UsbCommand resp;
        uint8_t *recv;
        UsbCommand c = {CMD_ISO_15693_COMMAND, {0, 1, 1}}; // len,speed,recv?
        uint8_t *req=c.d.asBytes;
@@ -106,11 +113,9 @@ int getUID(uint8_t *buf)
        
                SendCommand(&c);
                
-               r=WaitForResponseTimeout(CMD_ACK,1000);
-               
-               if (r!=NULL) {
-                       recv = r->d.asBytes;
-                       if (r->arg[0]>=12 && ISO15_CRC_CHECK==Crc(recv,12)) {
+               if (WaitForResponseTimeout(CMD_ACK,&resp,1000)) {
+                       recv = resp.d.asBytes;
+                       if (resp.arg[0]>=12 && ISO15_CRC_CHECK==Crc(recv,12)) {
                           memcpy(buf,&recv[2],8);
                           return 1;
                        } 
@@ -271,7 +276,28 @@ int CmdHF15Reader(const char *Cmd)
 // Simulation is still not working very good
 int CmdHF15Sim(const char *Cmd)
 {
-       UsbCommand c = {CMD_SIMTAG_ISO_15693, {strtol(Cmd, NULL, 0), 0, 0}};
+       char cmdp = param_getchar(Cmd, 0);
+       uint8_t uid[8] = {0x00};
+
+       //E0 16 24 00 00 00 00 00
+       if (cmdp == 'h' || cmdp == 'H') {
+               PrintAndLog("Usage:  hf 15 sim <UID>");
+               PrintAndLog("");
+               PrintAndLog("     sample: hf 15 sim E016240000000000");
+               return 0;
+       }
+
+       if (param_gethex(Cmd, 0, uid, 16)) {
+               PrintAndLog("UID must include 16 HEX symbols");
+               return 0;
+       }
+       
+       PrintAndLog("Starting simulating UID %02X %02X %02X %02X %02X %02X %02X %02X",
+                       uid[0],uid[1],uid[2],uid[3],uid[4], uid[5], uid[6], uid[7]);
+
+       UsbCommand c = {CMD_SIMTAG_ISO_15693, {0, 0, 0}};
+       memcpy(c.d.asBytes,uid,8);
+       
        SendCommand(&c);
        return 0;
 }
@@ -287,7 +313,7 @@ int CmdHF15Afi(const char *Cmd)
 
 // Reads all memory pages
 int CmdHF15DumpMem(const char*Cmd) {
-       UsbCommand *r;  
+       UsbCommand resp;
        uint8_t uid[8]; 
        uint8_t *recv=NULL;
        UsbCommand c = {CMD_ISO_15693_COMMAND, {0, 1, 1}}; // len,speed,recv?
@@ -316,20 +342,18 @@ int CmdHF15DumpMem(const char*Cmd) {
        
                SendCommand(&c);
                
-               r=WaitForResponseTimeout(CMD_ACK,1000);
-               
-               if (r!=NULL) {
-                       recv = r->d.asBytes;
-                       if (ISO15_CRC_CHECK==Crc(recv,r->arg[0])) {
+               if (WaitForResponseTimeout(CMD_ACK,&resp,1000)) {
+                       recv = resp.d.asBytes;
+                       if (ISO15_CRC_CHECK==Crc(recv,resp.arg[0])) {
                                if (!(recv[0] & ISO15_RES_ERROR)) {
                                        retry=0;
                                        *output=0; // reset outputstring
-                                       sprintf(output, "Block %2i   ",blocknum);
-                                       for ( int i=1; i<r->arg[0]-2; i++) { // data in hex
-                                               sprintf(output+strlen(output),"%02hX ",recv[i]);                                        
+                                       sprintf(output, "Block %02x   ",blocknum);
+                                       for ( int i=1; i<resp.arg[0]-2; i++) { // data in hex
+                                               sprintf(output+strlen(output),"%02X ",recv[i]);
                                        }                                       
                                        strcat(output,"   "); 
-                                       for ( int i=1; i<r->arg[0]-2; i++) { // data in cleaned ascii
+                                       for ( int i=1; i<resp.arg[0]-2; i++) { // data in cleaned ascii
                                                sprintf(output+strlen(output),"%c",(recv[i]>31 && recv[i]<127)?recv[i]:'.');                                    
                                        }                                       
                                        PrintAndLog("%s",output);       
@@ -341,14 +365,14 @@ int CmdHF15DumpMem(const char*Cmd) {
                                }
                        } // else PrintAndLog("crc");
                } // else PrintAndLog("r null");
-               
        } // retry
-       if (r && r->arg[0]<3) 
-               PrintAndLog("Lost Connection");
-       else if (r && ISO15_CRC_CHECK!=Crc(r->d.asBytes,r->arg[0]))
-               PrintAndLog("CRC Failed");
-       else 
-               PrintAndLog("Tag returned Error %i: %s",recv[1],TagErrorStr(recv[1])); 
+  // TODO: need fix
+//     if (resp.arg[0]<3)
+//             PrintAndLog("Lost Connection");
+//     else if (ISO15_CRC_CHECK!=Crc(resp.d.asBytes,resp.arg[0]))
+//             PrintAndLog("CRC Failed");
+//     else 
+//             PrintAndLog("Tag returned Error %i: %s",recv[1],TagErrorStr(recv[1])); 
        return 0;
 }
 
@@ -387,7 +411,7 @@ int CmdHF15Help(const char *Cmd)
 
 int CmdHF15CmdInquiry(const char *Cmd) 
 {
-       UsbCommand *r;  
+       UsbCommand resp;
        uint8_t *recv;
        UsbCommand c = {CMD_ISO_15693_COMMAND, {0, 1, 1}}; // len,speed,recv?
        uint8_t *req=c.d.asBytes;
@@ -402,15 +426,13 @@ int CmdHF15CmdInquiry(const char *Cmd)
 
        SendCommand(&c);
        
-       r=WaitForResponseTimeout(CMD_ACK,1000);
-       
-       if (r!=NULL) {
-               if (r->arg[0]>=12) {
-                  recv = r->d.asBytes;
+       if (WaitForResponseTimeout(CMD_ACK,&resp,1000)) {
+               if (resp.arg[0]>=12) {
+                  recv = resp.d.asBytes;
                   PrintAndLog("UID=%s",sprintUID(NULL,&recv[2]));
                   PrintAndLog("Tag Info: %s",getTagInfo(&recv[2]));    
                } else {
-                       PrintAndLog("Response to short, just %i bytes. No tag?\n",r->arg[0]);           
+                       PrintAndLog("Response to short, just %i bytes. No tag?\n",resp.arg[0]);
                }
        } else {
                PrintAndLog("timeout.");
@@ -423,8 +445,9 @@ int CmdHF15CmdInquiry(const char *Cmd)
 int CmdHF15CmdDebug( const char *cmd) {
        int debug=atoi(cmd);
        if (strlen(cmd)<1) {
-               PrintAndLog("Usage: hf 15 cmd debug  <0/1>");
-               PrintAndLog("   0..no debugging output  1..turn debugging on"); 
+               PrintAndLog("Usage: hf 15 cmd debug  <0|1>");
+               PrintAndLog("   0 no debugging");
+               PrintAndLog("   1 turn debugging on");  
                return 0;
        }
 
@@ -435,7 +458,7 @@ int CmdHF15CmdDebug( const char *cmd) {
 
 
 int CmdHF15CmdRaw (const char *cmd) {
-       UsbCommand *r;  
+       UsbCommand resp;
        uint8_t *recv;
        UsbCommand c = {CMD_ISO_15693_COMMAND, {0, 1, 1}}; // len,speed,recv?
        int reply=1;
@@ -510,15 +533,13 @@ int CmdHF15CmdRaw (const char *cmd) {
        SendCommand(&c);
        
        if (reply) {
-               r=WaitForResponseTimeout(CMD_ACK,1000);
-       
-               if (r!=NULL) {
-                       recv = r->d.asBytes;
-                       PrintAndLog("received %i octets",r->arg[0]);
-                       hexout = (char *)malloc(r->arg[0] * 3 + 1);
+               if (WaitForResponseTimeout(CMD_ACK,&resp,1000)) {
+                       recv = resp.d.asBytes;
+                       PrintAndLog("received %i octets",resp.arg[0]);
+                       hexout = (char *)malloc(resp.arg[0] * 3 + 1);
                        if (hexout != NULL) {
-                               for (int i = 0; i < r->arg[0]; i++) { // data in hex
-                                       sprintf(&hexout[i * 3], "%02hX ", recv[i]);
+                               for (int i = 0; i < resp.arg[0]; i++) { // data in hex
+                                       sprintf(&hexout[i * 3], "%02X ", recv[i]);
                                }
                                PrintAndLog("%s", hexout);
                                free(hexout);
@@ -532,9 +553,15 @@ int CmdHF15CmdRaw (const char *cmd) {
 }
 
 
+/**
+ * parses common HF 15 CMD parameters and prepares some data structures
+ * Parameters:
+ *  **cmd      command line
+ */
 int prepareHF15Cmd(char **cmd, UsbCommand *c, uint8_t iso15cmd[], int iso15cmdlen) {
        int temp;
-       uint8_t *req=c->d.asBytes, uid[8];
+       uint8_t *req=c->d.asBytes;
+       uint8_t uid[8] = {0x00};
        uint32_t reqlen=0;
 
        // strip
@@ -578,6 +605,7 @@ int prepareHF15Cmd(char **cmd, UsbCommand *c, uint8_t iso15cmd[], int iso15cmdle
                        reqlen+=iso15cmdlen;               
                   break;
                case '*':
+                       // we scan for the UID ourself
                        req[reqlen++]|= ISO15_REQ_SUBCARRIER_SINGLE | ISO15_REQ_DATARATE_HIGH | 
                       ISO15_REQ_NONINVENTORY | ISO15_REQ_ADDRESS;
                   memcpy(&req[reqlen],&iso15cmd[0],iso15cmdlen);
@@ -619,14 +647,12 @@ int prepareHF15Cmd(char **cmd, UsbCommand *c, uint8_t iso15cmd[], int iso15cmdle
        return 1;
 }
 
-
-
 /**
  * Commandline handling: HF15 CMD SYSINFO
  * get system information from tag/VICC
  */
 int CmdHF15CmdSysinfo(const char *Cmd) {
-       UsbCommand *r;  
+       UsbCommand resp;
        uint8_t *recv;
        UsbCommand c = {CMD_ISO_15693_COMMAND, {0, 1, 1}}; // len,speed,recv?
        uint8_t *req=c.d.asBytes;
@@ -640,7 +666,7 @@ int CmdHF15CmdSysinfo(const char *Cmd) {
 
        // usage:
        if (strlen(cmd)<1) {
-               PrintAndLog("Usage:  hf 15 cmd sysinfo    [options] <uid|s|*>");
+               PrintAndLog("Usage:  hf 15 cmd sysinfo    [options] <uid|s|u|*>");
                PrintAndLog("           options:");
                PrintAndLog("               -2        use slower '1 out of 256' mode");
                PrintAndLog("           uid (either): ");
@@ -661,15 +687,13 @@ int CmdHF15CmdSysinfo(const char *Cmd) {
 
        SendCommand(&c);
 
-       r=WaitForResponseTimeout(CMD_ACK,1000);
-       
-       if (r!=NULL && r->arg[0]>2) {
-               recv = r->d.asBytes;
-               if (ISO15_CRC_CHECK==Crc(recv,r->arg[0])) {
+       if (WaitForResponseTimeout(CMD_ACK,&resp,1000) && resp.arg[0]>2) {
+               recv = resp.d.asBytes;
+               if (ISO15_CRC_CHECK==Crc(recv,resp.arg[0])) {
                        if (!(recv[0] & ISO15_RES_ERROR)) {
                                *output=0; // reset outputstring
-                               for ( i=1; i<r->arg[0]-2; i++) {
-                                       sprintf(output+strlen(output),"%02hX ",recv[i]);                                        
+                               for ( i=1; i<resp.arg[0]-2; i++) {
+                                       sprintf(output+strlen(output),"%02X ",recv[i]);
                                }                                       
                                strcat(output,"\n\r");
                                strcat(output,"UID = ");
@@ -679,11 +703,11 @@ int CmdHF15CmdSysinfo(const char *Cmd) {
                                strcat(output,"\n\r");
                                i=10;
                                if (recv[1] & 0x01) 
-                                       sprintf(output+strlen(output),"DSFID supported, set to %02hX\n\r",recv[i++]);
+                                       sprintf(output+strlen(output),"DSFID supported, set to %02X\n\r",recv[i++]);
                                else 
                                        strcat(output,"DSFID not supported\n\r");
                                if (recv[1] & 0x02) 
-                                       sprintf(output+strlen(output),"AFI supported, set to %03hX\n\r",recv[i++]);
+                                       sprintf(output+strlen(output),"AFI supported, set to %03X\n\r",recv[i++]);
                                else 
                                        strcat(output,"AFI not supported\n\r");
                                if (recv[1] & 0x04) {
@@ -693,7 +717,7 @@ int CmdHF15CmdSysinfo(const char *Cmd) {
                                        i+=2;
                                } else 
                                        strcat(output,"Tag does not provide information on memory layout\n\r");
-                               if (recv[1] & 0x08) sprintf(output+strlen(output),"IC reference given: %02hX\n\r",recv[i++]);
+                               if (recv[1] & 0x08) sprintf(output+strlen(output),"IC reference given: %02X\n\r",recv[i++]);
                                        else strcat(output,"IC reference not given\n\r");
 
 
@@ -705,16 +729,97 @@ int CmdHF15CmdSysinfo(const char *Cmd) {
                        PrintAndLog("CRC failed");
                }
        } else {
-               PrintAndLog("no answer");
+               PrintAndLog("timeout: no answer");
        }
        
        return 0;
 }
 
+/**
+ * Commandline handling: HF15 CMD READMULTI
+ * Read multiple blocks at once (not all tags support this)
+ */
+int CmdHF15CmdReadmulti(const char *Cmd) {
+       UsbCommand resp;
+       uint8_t *recv;
+       UsbCommand c = {CMD_ISO_15693_COMMAND, {0, 1, 1}}; // len,speed,recv?
+       uint8_t *req=c.d.asBytes;
+       int reqlen=0, pagenum,pagecount;
+       char cmdbuf[100];
+       char *cmd=cmdbuf;
+       char output[2048]="";
+       
+       strncpy(cmd,Cmd,99);
+
+       // usage:
+       if (strlen(cmd)<3) {
+               PrintAndLog("Usage:  hf 15 cmd readmulti  [options] <uid|s|u|*> <start#> <count#>");
+               PrintAndLog("           options:");
+               PrintAndLog("               -2        use slower '1 out of 256' mode");
+               PrintAndLog("           uid (either): ");
+               PrintAndLog("               <8B hex>  full UID eg E011223344556677");
+               PrintAndLog("               s         selected tag");
+               PrintAndLog("               u         unaddressed mode");
+               PrintAndLog("               *         scan for tag");
+               PrintAndLog("           start#:       page number to start 0-255");  
+               PrintAndLog("           count#:       number of pages");  
+               return 0;
+       }       
+       
+       prepareHF15Cmd(&cmd, &c,(uint8_t[]){ISO15_CMD_READMULTI},1);    
+       reqlen=c.arg[0];
+
+       pagenum=strtol(cmd,NULL,0);
+
+       // skip to next space           
+       while (*cmd!=' ' && *cmd!='\t') cmd++;
+       // skip over the space
+       while (*cmd==' ' || *cmd=='\t') cmd++;
+
+       pagecount=strtol(cmd,NULL,0);
+       if (pagecount>0) pagecount--; // 0 means 1 page, 1 means 2 pages, ...   
+       
+       req[reqlen++]=(uint8_t)pagenum;
+       req[reqlen++]=(uint8_t)pagecount;
+       
+       reqlen=AddCrc(req,reqlen);
+       
+       c.arg[0]=reqlen;
+
+       SendCommand(&c);
 
+       if (WaitForResponseTimeout(CMD_ACK,&resp,1000) && resp.arg[0]>2) {
+               recv = resp.d.asBytes;
+               if (ISO15_CRC_CHECK==Crc(recv,resp.arg[0])) {
+                       if (!(recv[0] & ISO15_RES_ERROR)) {
+                               *output=0; // reset outputstring
+                               for ( int i=1; i<resp.arg[0]-2; i++) {
+                                       sprintf(output+strlen(output),"%02X ",recv[i]);
+                               }                                       
+                               strcat(output,"   ");
+                               for ( int i=1; i<resp.arg[0]-2; i++) {
+                                       sprintf(output+strlen(output),"%c",recv[i]>31 && recv[i]<127?recv[i]:'.');                                      
+                               }                                       
+                               PrintAndLog("%s",output);       
+                       } else {
+                               PrintAndLog("Tag returned Error %i: %s",recv[0],TagErrorStr(recv[0])); 
+                       }                  
+               } else {
+                       PrintAndLog("CRC failed");
+               }
+       } else {
+               PrintAndLog("no answer");
+       }
+       
+       return 0;
+}
 
+/**
+ * Commandline handling: HF15 CMD READ
+ * Reads a single Block
+ */
 int CmdHF15CmdRead(const char *Cmd) {
-       UsbCommand *r;  
+       UsbCommand resp;
        uint8_t *recv;
        UsbCommand c = {CMD_ISO_15693_COMMAND, {0, 1, 1}}; // len,speed,recv?
        uint8_t *req=c.d.asBytes;
@@ -727,7 +832,7 @@ int CmdHF15CmdRead(const char *Cmd) {
 
        // usage:
        if (strlen(cmd)<3) {
-               PrintAndLog("Usage:  hf 15 cmd read    [options] <uid|s|*> <page#>");
+               PrintAndLog("Usage:  hf 15 cmd read    [options] <uid|s|u|*> <page#>");
                PrintAndLog("           options:");
                PrintAndLog("               -2        use slower '1 out of 256' mode");
                PrintAndLog("           uid (either): ");
@@ -756,19 +861,17 @@ int CmdHF15CmdRead(const char *Cmd) {
 
        SendCommand(&c);
 
-       r=WaitForResponseTimeout(CMD_ACK,1000);
-       
-       if (r!=NULL && r->arg[0]>2) {
-               recv = r->d.asBytes;
-               if (ISO15_CRC_CHECK==Crc(recv,r->arg[0])) {
+       if (WaitForResponseTimeout(CMD_ACK,&resp,1000) && resp.arg[0]>2) {
+               recv = resp.d.asBytes;
+               if (ISO15_CRC_CHECK==Crc(recv,resp.arg[0])) {
                        if (!(recv[0] & ISO15_RES_ERROR)) {
                                *output=0; // reset outputstring
                                //sprintf(output, "Block %2i   ",blocknum);
-                               for ( int i=1; i<r->arg[0]-2; i++) {
-                                       sprintf(output+strlen(output),"%02hX ",recv[i]);                                        
+                               for ( int i=1; i<resp.arg[0]-2; i++) {
+                                       sprintf(output+strlen(output),"%02X ",recv[i]);
                                }                                       
                                strcat(output,"   ");
-                               for ( int i=1; i<r->arg[0]-2; i++) {
+                               for ( int i=1; i<resp.arg[0]-2; i++) {
                                        sprintf(output+strlen(output),"%c",recv[i]>31 && recv[i]<127?recv[i]:'.');                                      
                                }                                       
                                PrintAndLog("%s",output);       
@@ -786,8 +889,12 @@ int CmdHF15CmdRead(const char *Cmd) {
 }
 
 
+/**
+ * Commandline handling: HF15 CMD WRITE
+ * Writes a single Block - might run into timeout, even when successful
+ */
 int CmdHF15CmdWrite(const char *Cmd) {
-       UsbCommand *r;  
+       UsbCommand resp;
        uint8_t *recv;
        UsbCommand c = {CMD_ISO_15693_COMMAND, {0, 1, 1}}; // len,speed,recv?
        uint8_t *req=c.d.asBytes;
@@ -800,7 +907,7 @@ int CmdHF15CmdWrite(const char *Cmd) {
 
        // usage:
        if (strlen(cmd)<3) {
-               PrintAndLog("Usage:  hf 15 cmd write    [options] <uid|s|*> <page#> <hexdata>");
+               PrintAndLog("Usage:  hf 15 cmd write    [options] <uid|s|u|*> <page#> <hexdata>");
                PrintAndLog("           options:");
                PrintAndLog("               -2        use slower '1 out of 256' mode");
                PrintAndLog("               -o        set OPTION Flag (needed for TI)");
@@ -847,11 +954,9 @@ int CmdHF15CmdWrite(const char *Cmd) {
 
        SendCommand(&c);
 
-       r=WaitForResponseTimeout(CMD_ACK,2000);
-       
-       if (r!=NULL && r->arg[0]>2) {
-               recv = r->d.asBytes;
-               if (ISO15_CRC_CHECK==Crc(recv,r->arg[0])) {
+       if (WaitForResponseTimeout(CMD_ACK,&resp,2000) && resp.arg[0]>2) {
+               recv = resp.d.asBytes;
+               if (ISO15_CRC_CHECK==Crc(recv,resp.arg[0])) {
                        if (!(recv[0] & ISO15_RES_ERROR)) {                                     
                                PrintAndLog("OK");      
                        } else {
@@ -861,7 +966,7 @@ int CmdHF15CmdWrite(const char *Cmd) {
                        PrintAndLog("CRC failed");
                }
        } else {
-               PrintAndLog("no answer");
+               PrintAndLog("timeout: no answer - data may be written anyway");
        }
        
        return 0;
@@ -878,10 +983,8 @@ static command_t CommandTable15Cmd[] =
  */
        {"read",    CmdHF15CmdRead,    0, "Read a block"},      
        {"write",   CmdHF15CmdWrite,    0, "Write a block"},    
-/*
        {"readmulti",CmdHF15CmdReadmulti,    0, "Reads multiple Blocks"},
-*/     
-       {"sysinfo",      CmdHF15CmdSysinfo,     0,      "Get Card Information"},
+       {"sysinfo",CmdHF15CmdSysinfo,    0, "Get Card Information"},
        {"raw",          CmdHF15CmdRaw,         0,      "Send raw hex data to tag"}, 
        {"debug",    CmdHF15CmdDebug,    0, "Turn debugging on/off"},
        {NULL, NULL, 0, NULL}
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