X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/c95affa8d3d84f0bd5db7821f65c22e13870d4e2..refs/pull/538/head:/client/cmdhf14a.c?ds=inline

diff --git a/client/cmdhf14a.c b/client/cmdhf14a.c
index 50071464..8064724c 100644
--- a/client/cmdhf14a.c
+++ b/client/cmdhf14a.c
@@ -648,7 +648,7 @@ void DropField() {
 	SendCommand(&c);
 }
 
-int ExchangeAPDU14a(uint8_t *datain, int datainlen, bool activateField, bool leaveSignalON, uint8_t *dataout, int *dataoutlen) {
+int ExchangeAPDU14a(uint8_t *datain, int datainlen, bool activateField, bool leaveSignalON, uint8_t *dataout, int maxdataoutlen, int *dataoutlen) {
 	uint16_t cmdc = 0;
 	
 	if (activateField) {
@@ -686,6 +686,12 @@ int ExchangeAPDU14a(uint8_t *datain, int datainlen, bool activateField, bool lea
 		*dataoutlen = iLen - 2;
 		if (*dataoutlen < 0)
 			*dataoutlen = 0;
+		
+		if (maxdataoutlen && *dataoutlen > maxdataoutlen) {
+			PrintAndLog("APDU ERROR: Buffer too small(%d). Needs %d bytes", *dataoutlen, maxdataoutlen);
+			return 2;
+		}
+		
 		memcpy(dataout, recv, *dataoutlen);
 		
         if(!iLen) {
@@ -719,6 +725,7 @@ int ExchangeAPDU14a(uint8_t *datain, int datainlen, bool activateField, bool lea
 	return 0;
 }
 
+// ISO14443-4. 7. Half-duplex block transmission protocol
 int CmdHF14AAPDU(const char *cmd) {
 	uint8_t data[USB_CMD_DATA_SIZE];
 	int datalen = 0;
@@ -728,6 +735,7 @@ int CmdHF14AAPDU(const char *cmd) {
 	
 	if (strlen(cmd) < 2) {
 		PrintAndLog("Usage: hf 14a apdu [-s] [-k] [-t] <APDU (hex)>");
+		PrintAndLog("Command sends an ISO 7816-4 APDU via ISO 14443-4 block transmission protocol (T=CL)");
 		PrintAndLog("       -s    activate field and select card");
 		PrintAndLog("       -k    leave the signal field ON after receive response");
 		PrintAndLog("       -t    executes TLV decoder if it possible. TODO!!!!");
@@ -779,7 +787,7 @@ int CmdHF14AAPDU(const char *cmd) {
 
 	PrintAndLog(">>>>[%s%s%s] %s", activateField ? "sel ": "", leaveSignalON ? "keep ": "", decodeTLV ? "TLV": "", sprint_hex(data, datalen));
 	
-	int res = ExchangeAPDU14a(data, datalen, activateField, leaveSignalON, data, &datalen);
+	int res = ExchangeAPDU14a(data, datalen, activateField, leaveSignalON, data, USB_CMD_DATA_SIZE, &datalen);
 
 	if (res)
 		return res;
@@ -1013,7 +1021,7 @@ static command_t CommandTable[] =
   {"cuids",  CmdHF14ACUIDs,        0, "<n> Collect n>0 ISO14443 Type A UIDs in one go"},
   {"sim",    CmdHF14ASim,          0, "<UID> -- Simulate ISO 14443a tag"},
   {"snoop",  CmdHF14ASnoop,        0, "Eavesdrop ISO 14443 Type A"},
-  {"apdu",   CmdHF14AAPDU,         0, "Send ISO 14443-4 APDU to tag"},
+  {"apdu",   CmdHF14AAPDU,         0, "Send an ISO 7816-4 APDU via ISO 14443-4 block transmission protocol"},
   {"raw",    CmdHF14ACmdRaw,       0, "Send raw hex data to tag"},
   {NULL, NULL, 0, NULL}
 };