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Clear command buffer
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1//-----------------------------------------------------------------------------
2// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
3//
4// This code is licensed to you under the terms of the GNU GPL, version 2 or,
5// at your option, any later version. See the LICENSE.txt file for the text of
6// the license.
7//-----------------------------------------------------------------------------
8// Main command parser entry point
9//-----------------------------------------------------------------------------
10
11#include <stdio.h>
12#include <stdlib.h>
13#include <unistd.h>
14#include <string.h>
15#include "sleep.h"
16#include "cmdparser.h"
17#include "proxmark3.h"
18#include "data.h"
19#include "usb_cmd.h"
20#include "ui.h"
21#include "cmdhf.h"
22#include "cmddata.h"
23#include "cmdhw.h"
24#include "cmdlf.h"
25#include "cmdmain.h"
26#include "util.h"
27#include "cmdscript.h"
28
29
30unsigned int current_command = CMD_UNKNOWN;
31
32static int CmdHelp(const char *Cmd);
33static int CmdQuit(const char *Cmd);
34
35//For storing command that are received from the device
36#define CMD_BUFFER_SIZE 50
37static UsbCommand cmdBuffer[CMD_BUFFER_SIZE];
38//Points to the next empty position to write to
39static int cmd_head;//Starts as 0
40//Points to the position of the last unread command
41static int cmd_tail;//Starts as 0
42
43static command_t CommandTable[] =
44{
45 {"help", CmdHelp, 1, "This help. Use '<command> help' for details of a particular command."},
46 {"data", CmdData, 1, "{ Plot window / data buffer manipulation... }"},
47 {"hf", CmdHF, 1, "{ High Frequency commands... }"},
48 {"hw", CmdHW, 1, "{ Hardware commands... }"},
49 {"lf", CmdLF, 1, "{ Low Frequency commands... }"},
50 {"script", CmdScript, 1,"{ Scripting commands }"},
51 {"quit", CmdQuit, 1, "Exit program"},
52 {"exit", CmdQuit, 1, "Exit program"},
53 {NULL, NULL, 0, NULL}
54};
55
56command_t* getTopLevelCommandTable()
57{
58 return CommandTable;
59}
60int CmdHelp(const char *Cmd)
61{
62 CmdsHelp(CommandTable);
63 return 0;
64}
65
66int CmdQuit(const char *Cmd)
67{
68 exit(0);
69 return 0;
70}
71/**
72 * @brief This method should be called when sending a new command to the pm3. In case any old
73 * responses from previous commands are stored in the buffer, a call to this method should clear them.
74 * A better method could have been to have explicit command-ACKS, so we can know which ACK goes to which
75 * operation. Right now we'll just have to live with this.
76 */
77void clearCommandBuffer()
78{
79 //This is a very simple operation
80 cmd_tail = cmd_head;
81}
82
83/**
84 * @brief storeCommand stores a USB command in a circular buffer
85 * @param UC
86 */
87void storeCommand(UsbCommand *command)
88{
89 if( ( cmd_head+1) % CMD_BUFFER_SIZE == cmd_tail)
90 {
91 //If these two are equal, we're about to overwrite in the
92 // circular buffer.
93 PrintAndLog("WARNING: Command buffer about to overwrite command! This needs to be fixed!");
94 }
95 //Store the command at the 'head' location
96 UsbCommand* destination = &cmdBuffer[cmd_head];
97 memcpy(destination, command, sizeof(UsbCommand));
98
99 cmd_head = (cmd_head +1) % CMD_BUFFER_SIZE; //increment head and wrap
100
101}
102/**
103 * @brief getCommand gets a command from an internal circular buffer.
104 * @param response location to write command
105 * @return 1 if response was returned, 0 if nothing has been received
106 */
107int getCommand(UsbCommand* response)
108{
109 //If head == tail, there's nothing to read, or if we just got initialized
110 if(cmd_head == cmd_tail){
111 return 0;
112 }
113 //Pick out the next unread command
114 UsbCommand* last_unread = &cmdBuffer[cmd_tail];
115 memcpy(response, last_unread, sizeof(UsbCommand));
116 //Increment tail - this is a circular buffer, so modulo buffer size
117 cmd_tail = (cmd_tail +1 ) % CMD_BUFFER_SIZE;
118
119 return 1;
120
121}
122
123/**
124 * Waits for a certain response type. This method waits for a maximum of
125 * ms_timeout milliseconds for a specified response command.
126 *@brief WaitForResponseTimeout
127 * @param cmd command to wait for
128 * @param response struct to copy received command into.
129 * @param ms_timeout
130 * @return true if command was returned, otherwise false
131 */
132bool WaitForResponseTimeout(uint32_t cmd, UsbCommand* response, size_t ms_timeout) {
133
134 UsbCommand resp;
135
136 if (response == NULL)
137 response = &resp;
138
139
140 // Wait until the command is received
141 for(size_t dm_seconds=0; dm_seconds < ms_timeout/10; dm_seconds++) {
142
143 while(getCommand(response)) {
144 if(response->cmd == cmd){
145 return true;
146 }
147 }
148 msleep(10); // XXX ugh
149 if (dm_seconds == 200) { // Two seconds elapsed
150 PrintAndLog("Waiting for a response from the proxmark...");
151 PrintAndLog("Don't forget to cancel its operation first by pressing on the button");
152 }
153 }
154 return false;
155}
156
157bool WaitForResponse(uint32_t cmd, UsbCommand* response) {
158 return WaitForResponseTimeout(cmd,response,-1);
159}
160
161//-----------------------------------------------------------------------------
162// Entry point into our code: called whenever the user types a command and
163// then presses Enter, which the full command line that they typed.
164//-----------------------------------------------------------------------------
165void CommandReceived(char *Cmd) {
166 CmdsParse(CommandTable, Cmd);
167}
168
169//-----------------------------------------------------------------------------
170// Entry point into our code: called whenever we received a packet over USB
171// that we weren't necessarily expecting, for example a debug print.
172//-----------------------------------------------------------------------------
173void UsbCommandReceived(UsbCommand *UC)
174{
175 switch(UC->cmd) {
176 // First check if we are handling a debug message
177 case CMD_DEBUG_PRINT_STRING: {
178 char s[USB_CMD_DATA_SIZE+1] = {0x00};
179 size_t len = MIN(UC->arg[0],USB_CMD_DATA_SIZE);
180 memcpy(s,UC->d.asBytes,len);
181 PrintAndLog("#db# %s ", s);
182 return;
183 } break;
184
185 case CMD_DEBUG_PRINT_INTEGERS: {
186 PrintAndLog("#db# %08x, %08x, %08x \r\n", UC->arg[0], UC->arg[1], UC->arg[2]);
187 return;
188 } break;
189
190 case CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K: {
191 memcpy(sample_buf+(UC->arg[0]),UC->d.asBytes,UC->arg[1]);
192 } break;
193
194 default:
195 break;
196 }
197
198 storeCommand(UC);
199}
200
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