]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - client/cmdlfhitag.c
Merge pull request #909 from pwpiwi/fix_button_break
[proxmark3-svn] / client / cmdlfhitag.c
index 718cb703dc34df92563294104f06f3ad797a5342..22050a2f206360c06c33628479ab22a088797d67 100644 (file)
@@ -8,34 +8,30 @@
 // Low frequency Hitag support
 //-----------------------------------------------------------------------------
 
+#include "cmdlfhitag.h"
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "data.h"
-#include "proxmark3.h"
+#include "comms.h"
 #include "ui.h"
 #include "cmdparser.h"
 #include "common.h"
 #include "util.h"
 #include "parity.h"
-#include "hitag2.h"
-#include "hitagS.h"
+#include "hitag.h"
 #include "cmdmain.h"
 
-static int CmdHelp(const char *Cmd);
-
-size_t nbytes(size_t nbits) {
-       return (nbits/8)+((nbits%8)>0);
+static size_t nbytes(size_t nbits) {
+       return (nbits/8) + ((nbits%8)>0);
 }
 
-int CmdLFHitagList(const char *Cmd)
-{
-       uint8_t *got = malloc(USB_CMD_DATA_SIZE);
 
+static int CmdLFHitagList(const char *Cmd) {
+       uint8_t *got = malloc(USB_CMD_DATA_SIZE);
        // Query for the actual size of the trace
        UsbCommand response;
-       GetFromBigBuf(got, USB_CMD_DATA_SIZE, 0);
-       WaitForResponse(CMD_ACK, &response);
+       GetFromBigBuf(got, USB_CMD_DATA_SIZE, 0, &response, -1, false);
        uint16_t traceLen = response.arg[2];
        if (traceLen > USB_CMD_DATA_SIZE) {
                uint8_t *p = realloc(got, traceLen);
@@ -45,35 +41,36 @@ int CmdLFHitagList(const char *Cmd)
                        return 2;
                }
                got = p;
-               GetFromBigBuf(got, traceLen, 0);
-               WaitForResponse(CMD_ACK,NULL);
+               GetFromBigBuf(got, traceLen, 0, NULL, -1, false);
        }
-       
+
        PrintAndLog("recorded activity (TraceLen = %d bytes):");
        PrintAndLog(" ETU     :nbits: who bytes");
        PrintAndLog("---------+-----+----+-----------");
 
+       int j;
        int i = 0;
        int prev = -1;
        int len = strlen(Cmd);
 
        char filename[FILE_PATH_SIZE]  = { 0x00 };
        FILE* pf = NULL;
-       
-       if (len > FILE_PATH_SIZE) 
+
+       if (len > FILE_PATH_SIZE)
                len = FILE_PATH_SIZE;
        memcpy(filename, Cmd, len);
-   
+
        if (strlen(filename) > 0) {
                if ((pf = fopen(filename,"wb")) == NULL) {
                        PrintAndLog("Error: Could not open file [%s]",filename);
+                       free(got);
                        return 1;
                }
        }
 
        for (;;) {
-  
-               if(i > traceLen) { break; }
+
+               if(i >= traceLen) { break; }
 
                bool isResponse;
                int timestamp = *((uint32_t *)(got+i));
@@ -93,29 +90,53 @@ int CmdLFHitagList(const char *Cmd)
                // or each half bit period in 256 levels.
 
                int bits = got[i+8];
-               int len = nbytes(got[i+8]);
+               int len = nbytes(bits);
 
                if (len > 100) {
-                 break;
+                       break;
                }
                if (i + len > traceLen) { break;}
 
                uint8_t *frame = (got+i+9);
+/*
+               int fillupBits = 8 - (bits % 8);
+               byte_t framefilled[bits+fillupBits];
+               byte_t* ff = framefilled;
+
+               int response_bit[200] = {0};
+               int z = 0;
+               for (int y = 0; y < len; y++) {
+                       for (j = 0; j < 8; j++) {
+                               response_bit[z] = 0;
+                               if ((frame[y] & ((mask << 7) >> j)) != 0)
+                                       response_bit[z] = 1;
+                               z++;
+                       }
+               }
+               z = 0;
+               for (int y = 0; y < len; y++) {
+                       ff[y] = (response_bit[z] << 7) | (response_bit[z + 1] << 6)
+                                       | (response_bit[z + 2] << 5) | (response_bit[z + 3] << 4)
+                                       | (response_bit[z + 4] << 3) | (response_bit[z + 5] << 2)
+                                       | (response_bit[z + 6] << 1) | response_bit[z + 7];
+                       z += 8;
+               }
+*/
+
+
+
 
                // Break and stick with current result if buffer was not completely full
                if (frame[0] == 0x44 && frame[1] == 0x44 && frame[3] == 0x44) { break; }
 
                char line[1000] = "";
-               int j;
                for (j = 0; j < len; j++) {
-
-                 //if((parityBits >> (len - j - 1)) & 0x01) {
-                 if (isResponse && (oddparity8(frame[j]) != ((parityBits >> (len - j - 1)) & 0x01))) {
-                       sprintf(line+(j*4), "%02x!  ", frame[j]);
-                 }
-                 else {
-                       sprintf(line+(j*4), "%02x   ", frame[j]);
-                 }
+                       //if((parityBits >> (len - j - 1)) & 0x01) {
+                       if (isResponse && (oddparity8(frame[j]) != ((parityBits >> (len - j - 1)) & 0x01))) {
+                               sprintf(line+(j*4), "%02x!  ", frame[j]);
+                       } else {
+                               sprintf(line+(j*4), "%02x   ", frame[j]);
+                       }
                }
 
                PrintAndLog(" +%7d:  %3d: %s %s",
@@ -131,11 +152,11 @@ int CmdLFHitagList(const char *Cmd)
                                (isResponse ? "TAG" : "   "),
                                line);
                }
-               
+
                prev = timestamp;
                i += (len + 9);
        }
-  
+
        if (pf) {
                fclose(pf);
                PrintAndLog("Recorded activity succesfully written to file: %s", filename);
@@ -145,70 +166,134 @@ int CmdLFHitagList(const char *Cmd)
        return 0;
 }
 
-int CmdLFHitagSnoop(const char *Cmd) {
-  UsbCommand c = {CMD_SNOOP_HITAG};
-  SendCommand(&c);
-  return 0;
+
+static int CmdLFHitagSnoop(const char *Cmd) {
+       UsbCommand c = {CMD_SNOOP_HITAG};
+       SendCommand(&c);
+       return 0;
 }
 
-int CmdLFHitagSim(const char *Cmd) {
-    
-  UsbCommand c = {CMD_SIMULATE_HITAG};
+
+static int CmdLFHitagSim(const char *Cmd) {
+
+       UsbCommand c = {CMD_SIMULATE_HITAG};
        char filename[FILE_PATH_SIZE] = { 0x00 };
        FILE* pf;
        bool tag_mem_supplied;
        int len = strlen(Cmd);
        if (len > FILE_PATH_SIZE) len = FILE_PATH_SIZE;
        memcpy(filename, Cmd, len);
-       
+
        if (strlen(filename) > 0) {
                if ((pf = fopen(filename,"rb+")) == NULL) {
                        PrintAndLog("Error: Could not open file [%s]",filename);
                        return 1;
                }
                tag_mem_supplied = true;
-               if (fread(c.d.asBytes,48,1,pf) == 0) {
-      PrintAndLog("Error: File reading error");
-      fclose(pf);
+               if (fread(c.d.asBytes,1,48,pf) != 48) {
+                       PrintAndLog("Error: File reading error");
+                       fclose(pf);
                        return 1;
-    }
+               }
                fclose(pf);
        } else {
                tag_mem_supplied = false;
        }
-       
+
        // Does the tag comes with memory
        c.arg[0] = (uint32_t)tag_mem_supplied;
 
-  SendCommand(&c);
-  return 0;
+       SendCommand(&c);
+       return 0;
+}
+
+
+bool getHitagUid(uint32_t *uid, bool quiet) {
+       // ToDo: this is for Hitag2 only (??)
+       
+       UsbCommand c = {CMD_READER_HITAG, {RHT2F_UID_ONLY}};
+
+       SendCommand(&c);
+
+       UsbCommand resp;
+       if (!WaitForResponseTimeout(CMD_ACK, &resp, 2500)) {
+               if (!quiet) PrintAndLogEx(WARNING, "timeout while waiting for reply.");
+               return false;
+       }
+
+       if (resp.arg[0] == false) {
+               if (!quiet) PrintAndLogEx(DEBUG, "DEBUG: Error - failed getting UID");
+               return false;
+       }
+
+       if (uid)
+               *uid = bytes_to_num(resp.d.asBytes, 4);
+
+       return true;
 }
 
+
+static int CmdLFHitagInfo(const char *Cmd) {
+       char ctmp = param_getchar(Cmd, 0);
+       if (ctmp != '\0') {
+               PrintAndLog("Usage:   lf hitag info [h]");
+               PrintAndLog("Options:");
+               PrintAndLog("       h          This help");
+               PrintAndLog("Examples:");
+               PrintAndLog("         lf hitag info");
+               return 0;
+       }
+
+       // read UID
+       uint32_t uid = 0;
+       if (getHitagUid(&uid, false) == false)
+               return 1;
+
+       PrintAndLogEx(SUCCESS, "UID: %08X", uid);
+
+       // how to detemine Hitag types?
+       // read block3,  get configuration byte.
+       // PrintAndLogEx(FAILED, _RED_("TODO: This is a hardcoded example!"));
+
+       // common configurations.
+       // printHitagConfiguration(0x06);
+       //printHitagConfiguration( 0x0E );
+       //printHitagConfiguration( 0x02 );
+       //printHitagConfiguration( 0x00 );
+       //printHitagConfiguration( 0x04 );
+       return 0;
+}
+
+
 int CmdLFHitagReader(const char *Cmd) {
-       UsbCommand c = {CMD_READER_HITAG};//, {param_get32ex(Cmd,0,0,10),param_get32ex(Cmd,1,0,16),param_get32ex(Cmd,2,0,16),param_get32ex(Cmd,3,0,16)}};
+       UsbCommand c = {CMD_READER_HITAG};
        hitag_data* htd = (hitag_data*)c.d.asBytes;
-       hitag_function htf = param_get32ex(Cmd,0,0,10);
-       
+       hitag_function htf = param_get32ex(Cmd, 0, 0, 10);
+
        switch (htf) {
-               case 01: { //RHTSF_CHALLENGE
+               case RHTSF_CHALLENGE: {
                        c = (UsbCommand){ CMD_READ_HITAG_S };
-                       num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->auth.NrAr);
-                       num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
+                       num_to_bytes(param_get32ex(Cmd, 1, 0, 16), 4, htd->auth.NrAr);
+                       num_to_bytes(param_get32ex(Cmd, 2, 0, 16), 4, htd->auth.NrAr+4);
+                       c.arg[1] = param_get64ex(Cmd, 3, 0, 0); //firstpage
+                       c.arg[2] = param_get64ex(Cmd, 4, 0, 0); //tag mode
                } break;
-               case 02: { //RHTSF_KEY
+               case RHTSF_KEY: {
                        c = (UsbCommand){ CMD_READ_HITAG_S };
-                       num_to_bytes(param_get64ex(Cmd,1,0,16),6,htd->crypto.key);
+                       num_to_bytes(param_get64ex(Cmd, 1, 0, 16), 6, htd->crypto.key);
+                       c.arg[1] = param_get64ex(Cmd, 2, 0, 0); //firstpage
+                       c.arg[2] = param_get64ex(Cmd, 3, 0, 0); //tag mode
                } break;
                case RHT2F_PASSWORD: {
-                       num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->pwd.password);
+                       num_to_bytes(param_get32ex(Cmd, 1, 0, 16), 4, htd->pwd.password);
                } break;
                case RHT2F_AUTHENTICATE: {
-                       num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->auth.NrAr);
-                       num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
+                       num_to_bytes(param_get32ex(Cmd, 1, 0, 16), 4, htd->auth.NrAr);
+                       num_to_bytes(param_get32ex(Cmd, 2, 0, 16), 4, htd->auth.NrAr+4);
                } break;
                case RHT2F_CRYPTO: {
-                       num_to_bytes(param_get64ex(Cmd,1,0,16),6,htd->crypto.key);
-                       //                      num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
+                       num_to_bytes(param_get64ex(Cmd, 1, 0, 16), 6, htd->crypto.key);
+                       //          num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
                } break;
                case RHT2F_TEST_AUTH_ATTEMPTS: {
                        // No additional parameters needed
@@ -221,16 +306,18 @@ int CmdLFHitagReader(const char *Cmd) {
                        PrintAndLog("");
                        PrintAndLog("Usage: hitag reader <Reader Function #>");
                        PrintAndLog("Reader Functions:");
-                       PrintAndLog(" HitagS (0*)");
-                       PrintAndLog("  01 <nr> <ar> (Challenge) read all pages from a Hitag S tag");
-                       PrintAndLog("  02 <key> (set to 0 if no authentication is needed) read all pages from a Hitag S tag");
-                       PrintAndLog(" Hitag1 (1*)");
-                       PrintAndLog(" Hitag2 (2*)");
-                       PrintAndLog("  21 <password> (password mode)");
-                       PrintAndLog("  22 <nr> <ar> (authentication)");
-                       PrintAndLog("  23 <key> (authentication) key is in format: ISK high + ISK low");
-                       PrintAndLog("  25 (test recorded authentications)");
-                       PrintAndLog("  26 just read UID");
+                       PrintAndLog("  HitagS (0*):");
+                       PrintAndLog("    01 <nr> <ar> (Challenge) <firstPage> <tagmode> read all pages from a Hitag S tag");
+                       PrintAndLog("    02 <key> (set to 0 if no authentication is needed) <firstPage> <tagmode> read all pages from a Hitag S tag");
+                       PrintAndLog("    Valid tagmodes are 0=STANDARD, 1=ADVANCED, 2=FAST_ADVANCED (default is ADVANCED)");
+                       PrintAndLog("  Hitag1 (1*):");
+                       PrintAndLog("    (not yet implemented)");
+                       PrintAndLog("  Hitag2 (2*):");
+                       PrintAndLog("    21 <password> (password mode)");
+                       PrintAndLog("    22 <nr> <ar> (authentication)");
+                       PrintAndLog("    23 <key> (authentication) key is in format: ISK high + ISK low");
+                       PrintAndLog("    25 (test recorded authentications)");
+                       PrintAndLog("    26 just read UID");
                        return 1;
                } break;
        }
@@ -239,19 +326,26 @@ int CmdLFHitagReader(const char *Cmd) {
        c.arg[0] = htf;
 
        // Send the command to the proxmark
+       clearCommandBuffer();
        SendCommand(&c);
 
        UsbCommand resp;
-       WaitForResponse(CMD_ACK,&resp);
+       if (!WaitForResponseTimeout(CMD_ACK, &resp, 4000)) {
+               PrintAndLogEx(WARNING, "timeout while waiting for reply.");
+               return 1;
+       }
 
        // Check the return status, stored in the first argument
-       if (resp.arg[0] == false) return 1;
-       
-       uint32_t id = bytes_to_num(resp.d.asBytes,4);
-               
-       if (htf == RHT2F_UID_ONLY){
-               PrintAndLog("Valid Hitag2 tag found - UID: %08x",id);
-       } else {
+       if (resp.arg[0] == false)  {
+               PrintAndLogEx(DEBUG, "DEBUG: Error - hitag failed");
+               return 1;
+       }
+
+       uint32_t id = bytes_to_num(resp.d.asBytes, 4);
+
+       PrintAndLog("Valid Hitag2 tag found - UID: %08x", id);
+       if (htf != RHT2F_UID_ONLY) {
+        PrintAndLogEx(SUCCESS, "Dumping tag memory...");
                char filename[256];
                FILE* pf = NULL;
 
@@ -268,12 +362,11 @@ int CmdLFHitagReader(const char *Cmd) {
                PrintAndLog("Succesfully saved tag memory to [%s]",filename);
        }
 
-
        return 0;
 }
 
 
-int CmdLFHitagSimS(const char *Cmd) {
+static int CmdLFHitagSimS(const char *Cmd) {
        UsbCommand c = { CMD_SIMULATE_HITAG_S };
        char filename[FILE_PATH_SIZE] = { 0x00 };
        FILE* pf;
@@ -289,7 +382,7 @@ int CmdLFHitagSimS(const char *Cmd) {
                        return 1;
                }
                tag_mem_supplied = true;
-               if (fread(c.d.asBytes, 4*64, 1, pf) == 0) {
+               if (fread(c.d.asBytes, 1, 4*64, pf) != 4*64) {
                        PrintAndLog("Error: File reading error");
                        fclose(pf);
                        return 1;
@@ -306,7 +399,8 @@ int CmdLFHitagSimS(const char *Cmd) {
        return 0;
 }
 
-int CmdLFHitagCheckChallenges(const char *Cmd) {
+
+static int CmdLFHitagCheckChallenges(const char *Cmd) {
        UsbCommand c = { CMD_TEST_HITAGS_TRACES };
        char filename[FILE_PATH_SIZE] = { 0x00 };
        FILE* pf;
@@ -314,94 +408,112 @@ int CmdLFHitagCheckChallenges(const char *Cmd) {
        int len = strlen(Cmd);
        if (len > FILE_PATH_SIZE) len = FILE_PATH_SIZE;
        memcpy(filename, Cmd, len);
-       
+
        if (strlen(filename) > 0) {
                if ((pf = fopen(filename,"rb+")) == NULL) {
                        PrintAndLog("Error: Could not open file [%s]",filename);
                        return 1;
                }
                file_given = true;
-               if (fread(c.d.asBytes,8*60,1,pf) == 0) {
-      PrintAndLog("Error: File reading error");
-      fclose(pf);
+               if (fread(c.d.asBytes,1,8*60,pf) != 8*60) {
+                       PrintAndLog("Error: File reading error");
+                       fclose(pf);
                        return 1;
-        }
+               }
                fclose(pf);
        } else {
                file_given = false;
        }
-       
+
        //file with all the challenges to try
        c.arg[0] = (uint32_t)file_given;
+       c.arg[1] = param_get64ex(Cmd,2,0,0); //get mode
 
-  SendCommand(&c);
-  return 0;
+       SendCommand(&c);
+       return 0;
 }
 
 
-int CmdLFHitagWP(const char *Cmd) {
+static int CmdLFHitagWriter(const char *Cmd) {
        UsbCommand c = { CMD_WR_HITAG_S };
        hitag_data* htd = (hitag_data*)c.d.asBytes;
        hitag_function htf = param_get32ex(Cmd,0,0,10);
        switch (htf) {
-               case 03: { //WHTSF_CHALLENGE
+               case WHTSF_CHALLENGE: {
                        num_to_bytes(param_get64ex(Cmd,1,0,16),8,htd->auth.NrAr);
                        c.arg[2]= param_get32ex(Cmd, 2, 0, 10);
                        num_to_bytes(param_get32ex(Cmd,3,0,16),4,htd->auth.data);
                } break;
-               case 04: { //WHTSF_KEY
+               case WHTSF_KEY:
+               case WHT2F_CRYPTO: {
                        num_to_bytes(param_get64ex(Cmd,1,0,16),6,htd->crypto.key);
                        c.arg[2]= param_get32ex(Cmd, 2, 0, 10);
                        num_to_bytes(param_get32ex(Cmd,3,0,16),4,htd->crypto.data);
-
+               } break;
+               case WHT2F_PASSWORD: {
+                       num_to_bytes(param_get64ex(Cmd, 1, 0, 16), 4, htd->pwd.password);
+                       c.arg[2] = param_get32ex(Cmd, 2, 0, 10);
+                       num_to_bytes(param_get32ex(Cmd, 3, 0, 16), 4, htd->crypto.data);
                } break;
                default: {
                        PrintAndLog("Error: unkown writer function %d",htf);
                        PrintAndLog("Hitag writer functions");
-                       PrintAndLog(" HitagS (0*)");
-                       PrintAndLog("  03 <nr,ar> (Challenge) <page> <byte0...byte3> write page on a Hitag S tag");
-                       PrintAndLog("  04 <key> (set to 0 if no authentication is needed) <page> <byte0...byte3> write page on a Hitag S tag");
-                       PrintAndLog(" Hitag1 (1*)");
-                       PrintAndLog(" Hitag2 (2*)");
+                       PrintAndLog("  HitagS (0*):");
+                       PrintAndLog("    03 <nr,ar> (Challenge) <page> <byte0...byte3> write page on a Hitag S tag");
+                       PrintAndLog("    04 <key> (set to 0 if no authentication is needed) <page> <byte0...byte3> write page on a Hitag S tag");
+                       PrintAndLog("  Hitag1 (1*)");
+                       PrintAndLog("    (not yet implemented)");
+                       PrintAndLog("  Hitag2 (2*):");
+                       PrintAndLog("    24 <key> (set to 0 if no authentication is needed) <page> <byte0...byte3> write page on a Hitag S tag");
+                       PrintAndLog("    27 <password> <page> <byte0...byte3> write page on a Hitag2 tag");
                        return 1;
                } break;
        }
        // Copy the hitag function into the first argument
        c.arg[0] = htf;
 
-  // Send the command to the proxmark
-  SendCommand(&c);
-  
-  UsbCommand resp;
-  WaitForResponse(CMD_ACK,&resp);
-  
-  // Check the return status, stored in the first argument
-  if (resp.arg[0] == false) return 1;
-  return 0;
+       // Send the command to the proxmark
+       SendCommand(&c);
+
+       UsbCommand resp;
+       if (!WaitForResponseTimeout(CMD_ACK, &resp, 4000)) {
+               PrintAndLogEx(WARNING, "timeout while waiting for reply.");
+               return 1;
+       }
+
+       // Check the return status, stored in the first argument
+       if (resp.arg[0] == false) {
+               PrintAndLogEx(DEBUG, "DEBUG: Error - hitag write failed");
+               return 1;
+       }
+       return 0;
 }
 
 
-static command_t CommandTable[] = 
+static int CmdHelp(const char *Cmd);
+
+static command_t CommandTable[] =
 {
-  {"help",             CmdHelp,           1, "This help"},
-  {"list",             CmdLFHitagList,    1, "<outfile> List Hitag trace history"},
-  {"reader",           CmdLFHitagReader,  1, "Act like a Hitag Reader"},
-  {"sim",              CmdLFHitagSim,     1, "<infile> Simulate Hitag transponder"},
-  {"snoop",            CmdLFHitagSnoop,   1, "Eavesdrop Hitag communication"},
-  {"writer",                   CmdLFHitagWP,      1, "Act like a Hitag Writer" },
-  {"simS",             CmdLFHitagSimS,    1, "<hitagS.hts> Simulate HitagS transponder" }, 
-  {"checkChallenges",  CmdLFHitagCheckChallenges,   1, "<challenges.cc> test all challenges" }, {
-                               NULL,NULL, 0, NULL }
+       {"help",             CmdHelp,                   1, "This help"},
+       {"list",             CmdLFHitagList,            0, "<outfile> List Hitag trace history"},
+       {"info",             CmdLFHitagInfo,            0, "Tag information" },
+       {"reader",           CmdLFHitagReader,          0, "Act like a Hitag Reader"},
+       {"sim",              CmdLFHitagSim,             0, "Simulate Hitag transponder"},
+       {"snoop",            CmdLFHitagSnoop,           0, "Eavesdrop Hitag communication"},
+       {"writer",           CmdLFHitagWriter,          0, "Act like a Hitag Writer" },
+       {"simS",             CmdLFHitagSimS,            0, "Simulate HitagS transponder" },
+       {"checkChallenges",  CmdLFHitagCheckChallenges, 0, "Test challenges from a file" },
+       { NULL,              NULL,                      0, NULL }
 };
 
-int CmdLFHitag(const char *Cmd)
-{
-  CmdsParse(CommandTable, Cmd);
-  return 0;
+
+static int CmdHelp(const char *Cmd) {
+       CmdsHelp(CommandTable);
+       return 0;
 }
 
-int CmdHelp(const char *Cmd)
-{
-  CmdsHelp(CommandTable);
-  return 0;
+
+int CmdLFHitag(const char *Cmd) {
+       CmdsParse(CommandTable, Cmd);
+       return 0;
 }
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