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Merge pull request #3012 from thinkyhead/fix_command_injection

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Use a serial line buffer to prevent queue corruption
This commit is contained in:
Scott Lahteine 2016-03-19 01:43:54 -07:00
commit 4634feaeab
6 changed files with 137 additions and 124 deletions
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4
Marlin/Marlin.h
View file

@ -227,8 +227,8 @@ extern bool Running;
inline bool IsRunning() { return Running; }
inline bool IsStopped() { return !Running; }
bool enqueuecommand(const char* cmd); //put a single ASCII command at the end of the current buffer or return false when it is full
void enqueuecommands_P(const char* cmd); //put one or many ASCII commands at the end of the current buffer, read from flash
bool enqueue_and_echo_command(const char* cmd, bool say_ok=false); //put a single ASCII command at the end of the current buffer or return false when it is full
void enqueue_and_echo_commands_P(const char* cmd); //put one or many ASCII commands at the end of the current buffer, read from flash
void prepare_arc_move(char isclockwise);
void clamp_to_software_endstops(float target[3]);

222
Marlin/Marlin_main.cpp
View file

@ -276,9 +276,7 @@ const char echomagic[] PROGMEM = "echo:";
const char axis_codes[NUM_AXIS] = {'X', 'Y', 'Z', 'E'};
static bool relative_mode = false; //Determines Absolute or Relative Coordinates
static char serial_char;
static int serial_count = 0;
static boolean comment_mode = false;
static char* seen_pointer; ///< A pointer to find chars in the command string (X, Y, Z, E, etc.)
const char* queued_commands_P = NULL; /* pointer to the current line in the active sequence of commands, or NULL when none */
const int sensitive_pins[] = SENSITIVE_PINS; ///< Sensitive pin list for M42
@ -409,9 +407,7 @@ static uint8_t target_extruder;
static bool filrunoutEnqueued = false;
#endif
#if ENABLED(SDSUPPORT)
static bool fromsd[BUFSIZE];
#endif
static bool send_ok[BUFSIZE];
#if HAS_SERVOS
Servo servo[NUM_SERVOS];
@ -487,29 +483,28 @@ extern "C" {
#endif //!SDSUPPORT
/**
* Inject the next command from the command queue, when possible
* Return false only if no command was pending
* Inject the next "immediate" command, when possible.
* Return true if any immediate commands remain to inject.
*/
static bool drain_queued_commands_P() {
if (!queued_commands_P) return false;
// Get the next 30 chars from the sequence of gcodes to run
char cmd[30];
strncpy_P(cmd, queued_commands_P, sizeof(cmd) - 1);
cmd[sizeof(cmd) - 1] = '\0';
// Look for the end of line, or the end of sequence
size_t i = 0;
char c;
while ((c = cmd[i]) && c != '\n') i++; // find the end of this gcode command
cmd[i] = '\0';
if (enqueuecommand(cmd)) { // buffer was not full (else we will retry later)
if (c)
queued_commands_P += i + 1; // move to next command
else
queued_commands_P = NULL; // will have no more commands in the sequence
if (queued_commands_P != NULL) {
// Get the next gcode to run
size_t i = 0;
char c;
while ((c = queued_commands_P[i++]) && c != '\n') { };
if (i > 1) {
char cmd[i];
strncpy_P(cmd, queued_commands_P, i - 1);
cmd[i - 1] = '\0';
if (enqueue_and_echo_command(cmd)) { // buffer was not full (else we will retry later)
if (c)
queued_commands_P += i; // move to next command
else
queued_commands_P = NULL; // no more commands in the sequence
}
}
}
return true;
return (queued_commands_P != NULL); // any more left to add?
}
/**
@ -517,32 +512,45 @@ static bool drain_queued_commands_P() {
* Aborts the current queue, if any.
* Note: drain_queued_commands_P() must be called repeatedly to drain the commands afterwards
*/
void enqueuecommands_P(const char* pgcode) {
void enqueue_and_echo_commands_P(const char* pgcode) {
queued_commands_P = pgcode;
drain_queued_commands_P(); // first command executed asap (when possible)
}
/**
* Copy a command directly into the main command buffer, from RAM.
*
* This is done in a non-safe way and needs a rework someday.
* Returns false if it doesn't add any command
* Once a new command is in the ring buffer, call this to commit it
*/
bool enqueuecommand(const char* cmd) {
if (*cmd == ';' || commands_in_queue >= BUFSIZE) return false;
// This is dangerous if a mixing of serial and this happens
char* command = command_queue[cmd_queue_index_w];
strcpy(command, cmd);
SERIAL_ECHO_START;
SERIAL_ECHOPGM(MSG_Enqueueing);
SERIAL_ECHO(command);
SERIAL_ECHOLNPGM("\"");
inline void _commit_command(bool say_ok) {
send_ok[cmd_queue_index_w] = say_ok;
cmd_queue_index_w = (cmd_queue_index_w + 1) % BUFSIZE;
commands_in_queue++;
}
/**
* Copy a command directly into the main command buffer, from RAM.
* Returns true if successfully adds the command
*/
inline bool _enqueuecommand(const char* cmd, bool say_ok=false) {
if (*cmd == ';' || commands_in_queue >= BUFSIZE) return false;
strcpy(command_queue[cmd_queue_index_w], cmd);
_commit_command(say_ok);
return true;
}
/**
* Enqueue with Serial Echo
*/
bool enqueue_and_echo_command(const char* cmd, bool say_ok/*=false*/) {
if (_enqueuecommand(cmd, say_ok)) {
SERIAL_ECHO_START;
SERIAL_ECHOPGM(MSG_Enqueueing);
SERIAL_ECHO(cmd);
SERIAL_ECHOLNPGM("\"");
return true;
}
return false;
}
void setup_killpin() {
#if HAS_KILL
SET_INPUT(KILL_PIN);
@ -699,9 +707,8 @@ void setup() {
SERIAL_ECHOPGM(MSG_PLANNER_BUFFER_BYTES);
SERIAL_ECHOLN((int)sizeof(block_t)*BLOCK_BUFFER_SIZE);
#if ENABLED(SDSUPPORT)
for (int8_t i = 0; i < BUFSIZE; i++) fromsd[i] = false;
#endif
// Send "ok" after commands by default
for (int8_t i = 0; i < BUFSIZE; i++) send_ok[i] = true;
// loads data from EEPROM if available else uses defaults (and resets step acceleration rate)
Config_RetrieveSettings();
@ -760,7 +767,7 @@ void setup() {
* - Call LCD update
*/
void loop() {
if (commands_in_queue < BUFSIZE - 1) get_command();
if (commands_in_queue < BUFSIZE) get_command();
#if ENABLED(SDSUPPORT)
card.checkautostart(false);
@ -820,9 +827,12 @@ void gcode_line_error(const char* err, bool doFlush = true) {
*/
void get_command() {
static char serial_line_buffer[MAX_CMD_SIZE];
static boolean serial_comment_mode = false;
if (drain_queued_commands_P()) return; // priority is given to non-serial commands
#if ENABLED(NO_TIMEOUTS)
#if defined(NO_TIMEOUTS) && NO_TIMEOUTS > 0
static millis_t last_command_time = 0;
millis_t ms = millis();
@ -837,29 +847,21 @@ void get_command() {
//
while (commands_in_queue < BUFSIZE && MYSERIAL.available() > 0) {
#if ENABLED(NO_TIMEOUTS)
last_command_time = ms;
#endif
serial_char = MYSERIAL.read();
char serial_char = MYSERIAL.read();
//
// If the character ends the line, or the line is full...
// If the character ends the line
//
if (serial_char == '\n' || serial_char == '\r' || serial_count >= MAX_CMD_SIZE - 1) {
if (serial_char == '\n' || serial_char == '\r') {
// end of line == end of comment
comment_mode = false;
serial_comment_mode = false; // end of line == end of comment
if (!serial_count) return; // empty lines just exit
char* command = command_queue[cmd_queue_index_w];
command[serial_count] = 0; // terminate string
serial_line_buffer[serial_count] = 0; // terminate string
serial_count = 0; //reset buffer
// this item in the queue is not from sd
#if ENABLED(SDSUPPORT)
fromsd[cmd_queue_index_w] = false;
#endif
char* command = serial_line_buffer;
while (*command == ' ') command++; // skip any leading spaces
char* npos = (*command == 'N') ? command : NULL; // Require the N parameter to start the line
@ -924,44 +926,56 @@ void get_command() {
// If command was e-stop process now
if (strcmp(command, "M112") == 0) kill(PSTR(MSG_KILLED));
cmd_queue_index_w = (cmd_queue_index_w + 1) % BUFSIZE;
commands_in_queue += 1;
#if defined(NO_TIMEOUTS) && NO_TIMEOUTS > 0
last_command_time = ms;
#endif
serial_count = 0; //clear buffer
// Add the command to the queue
_enqueuecommand(serial_line_buffer, true);
}
else if (serial_count >= MAX_CMD_SIZE - 1) {
// Keep fetching, but ignore normal characters beyond the max length
// The command will be injected when EOL is reached
}
else if (serial_char == '\\') { // Handle escapes
if (MYSERIAL.available() > 0 && commands_in_queue < BUFSIZE) {
if (MYSERIAL.available() > 0) {
// if we have one more character, copy it over
serial_char = MYSERIAL.read();
command_queue[cmd_queue_index_w][serial_count++] = serial_char;
serial_line_buffer[serial_count++] = serial_char;
}
// otherwise do nothing
}
else { // its not a newline, carriage return or escape char
if (serial_char == ';') comment_mode = true;
if (!comment_mode) command_queue[cmd_queue_index_w][serial_count++] = serial_char;
else { // it's not a newline, carriage return or escape char
if (serial_char == ';') serial_comment_mode = true;
if (!serial_comment_mode) serial_line_buffer[serial_count++] = serial_char;
}
}
} // queue has space, serial has data
#if ENABLED(SDSUPPORT)
if (!card.sdprinting || serial_count) return;
static bool stop_buffering = false,
sd_comment_mode = false;
if (!card.sdprinting) return;
// '#' stops reading from SD to the buffer prematurely, so procedural macro calls are possible
// if it occurs, stop_buffering is triggered and the buffer is ran dry.
// if it occurs, stop_buffering is triggered and the buffer is run dry.
// this character _can_ occur in serial com, due to checksums. however, no checksums are used in SD printing
static bool stop_buffering = false;
if (commands_in_queue == 0) stop_buffering = false;
while (!card.eof() && commands_in_queue < BUFSIZE && !stop_buffering) {
uint16_t sd_count = 0;
bool card_eof = card.eof();
while (commands_in_queue < BUFSIZE && !card_eof && !stop_buffering) {
int16_t n = card.get();
serial_char = (char)n;
if (serial_char == '\n' || serial_char == '\r' ||
((serial_char == '#' || serial_char == ':') && !comment_mode) ||
serial_count >= (MAX_CMD_SIZE - 1) || n == -1
char sd_char = (char)n;
card_eof = card.eof();
if (card_eof || n == -1
|| sd_char == '\n' || sd_char == '\r'
|| ((sd_char == '#' || sd_char == ':') && !sd_comment_mode)
) {
if (card.eof()) {
if (card_eof) {
SERIAL_PROTOCOLLNPGM(MSG_FILE_PRINTED);
print_job_stop_ms = millis();
char time[30];
@ -974,24 +988,24 @@ void get_command() {
card.printingHasFinished();
card.checkautostart(true);
}
if (serial_char == '#') stop_buffering = true;
if (sd_char == '#') stop_buffering = true;
if (!serial_count) {
comment_mode = false; //for new command
return; //if empty line
}
command_queue[cmd_queue_index_w][serial_count] = 0; //terminate string
// if (!comment_mode) {
fromsd[cmd_queue_index_w] = true;
commands_in_queue += 1;
cmd_queue_index_w = (cmd_queue_index_w + 1) % BUFSIZE;
// }
comment_mode = false; //for new command
serial_count = 0; //clear buffer
sd_comment_mode = false; //for new command
if (!sd_count) continue; //skip empty lines
command_queue[cmd_queue_index_w][sd_count] = '\0'; //terminate string
sd_count = 0; //clear buffer
_commit_command(false);
}
else if (sd_count >= MAX_CMD_SIZE - 1) {
// Keep fetching, but ignore normal characters beyond the max length
// The command will be injected when EOL is reached
}
else {
if (serial_char == ';') comment_mode = true;
if (!comment_mode) command_queue[cmd_queue_index_w][serial_count++] = serial_char;
if (sd_char == ';') sd_comment_mode = true;
if (!sd_comment_mode) command_queue[cmd_queue_index_w][sd_count++] = sd_char;
}
}
@ -2703,7 +2717,7 @@ inline void gcode_G28() {
case MeshStart:
mbl.reset();
probe_point = 0;
enqueuecommands_P(PSTR("G28\nG29 S2"));
enqueue_and_echo_commands_P(PSTR("G28\nG29 S2"));
break;
case MeshNext:
@ -2742,7 +2756,7 @@ inline void gcode_G28() {
SERIAL_PROTOCOLLNPGM("Mesh probing done.");
probe_point = -1;
mbl.active = 1;
enqueuecommands_P(PSTR("G28"));
enqueue_and_echo_commands_P(PSTR("G28"));
}
break;
@ -3264,7 +3278,7 @@ inline void gcode_G28() {
SERIAL_ECHOLNPGM(Z_PROBE_END_SCRIPT);
}
#endif
enqueuecommands_P(PSTR(Z_PROBE_END_SCRIPT));
enqueue_and_echo_commands_P(PSTR(Z_PROBE_END_SCRIPT));
st_synchronize();
#endif
@ -3429,7 +3443,7 @@ inline void gcode_M17() {
}
/**
* M23: Select a file
* M23: Open a file
*/
inline void gcode_M23() {
card.openFile(current_command_args, true);
@ -5301,7 +5315,7 @@ inline void gcode_M428() {
SERIAL_ERRORLNPGM(MSG_ERR_M428_TOO_FAR);
LCD_ALERTMESSAGEPGM("Err: Too far!");
#if HAS_BUZZER
enqueuecommands_P(PSTR("M300 S40 P200"));
enqueue_and_echo_commands_P(PSTR("M300 S40 P200"));
#endif
err = true;
break;
@ -5315,7 +5329,7 @@ inline void gcode_M428() {
sync_plan_position();
LCD_ALERTMESSAGEPGM("Offset applied.");
#if HAS_BUZZER
enqueuecommands_P(PSTR("M300 S659 P200\nM300 S698 P200"));
enqueue_and_echo_commands_P(PSTR("M300 S659 P200\nM300 S698 P200"));
#endif
}
}
@ -6365,9 +6379,7 @@ void FlushSerialRequestResend() {
void ok_to_send() {
refresh_cmd_timeout();
#if ENABLED(SDSUPPORT)
if (fromsd[cmd_queue_index_r]) return;
#endif
if (!send_ok[cmd_queue_index_r]) return;
SERIAL_PROTOCOLPGM(MSG_OK);
#if ENABLED(ADVANCED_OK)
char* p = command_queue[cmd_queue_index_r];
@ -7067,7 +7079,7 @@ void manage_inactivity(bool ignore_stepper_queue/*=false*/) {
filrunout();
#endif
if (commands_in_queue < BUFSIZE - 1) get_command();
if (commands_in_queue < BUFSIZE) get_command();
millis_t ms = millis();
@ -7124,7 +7136,7 @@ void manage_inactivity(bool ignore_stepper_queue/*=false*/) {
const int HOME_DEBOUNCE_DELAY = 2500;
if (!READ(HOME_PIN)) {
if (!homeDebounceCount) {
enqueuecommands_P(PSTR("G28"));
enqueue_and_echo_commands_P(PSTR("G28"));
LCD_MESSAGEPGM(MSG_AUTO_HOME);
}
if (homeDebounceCount < HOME_DEBOUNCE_DELAY)
@ -7250,7 +7262,7 @@ void kill(const char* lcd_msg) {
void filrunout() {
if (!filrunoutEnqueued) {
filrunoutEnqueued = true;
enqueuecommands_P(PSTR(FILAMENT_RUNOUT_SCRIPT));
enqueue_and_echo_commands_P(PSTR(FILAMENT_RUNOUT_SCRIPT));
st_synchronize();
}
}

15
Marlin/cardreader.cpp
View file

@ -243,6 +243,14 @@ void CardReader::release() {
cardOK = false;
}
void CardReader::openAndPrintFile(const char *name) {
char cmd[4 + (FILENAME_LENGTH + 1) * MAX_DIR_DEPTH + 2]; // Room for "M23 ", names with slashes, a null, and one extra
sprintf_P(cmd, PSTR("M23 %s"), name);
for (char *c = &cmd[4]; *c; c++) *c = tolower(*c);
enqueue_and_echo_command(cmd);
enqueue_and_echo_commands_P(PSTR("M24"));
}
void CardReader::startFileprint() {
if (cardOK)
sdprinting = true;
@ -500,10 +508,7 @@ void CardReader::checkautostart(bool force) {
while (root.readDir(p, NULL) > 0) {
for (int8_t i = 0; i < (int8_t)strlen((char*)p.name); i++) p.name[i] = tolower(p.name[i]);
if (p.name[9] != '~' && strncmp((char*)p.name, autoname, 5) == 0) {
char cmd[4 + (FILENAME_LENGTH + 1) * (MAX_DIR_DEPTH) + 2];
sprintf_P(cmd, PSTR("M23 %s"), autoname);
enqueuecommand(cmd);
enqueuecommands_P(PSTR("M24"));
openAndPrintFile(autoname);
found = true;
}
}
@ -589,7 +594,7 @@ void CardReader::printingHasFinished() {
sdprinting = false;
if (SD_FINISHED_STEPPERRELEASE) {
//finishAndDisableSteppers();
enqueuecommands_P(PSTR(SD_FINISHED_RELEASECOMMAND));
enqueue_and_echo_commands_P(PSTR(SD_FINISHED_RELEASECOMMAND));
}
autotempShutdown();
}

1
Marlin/cardreader.h
View file

@ -23,6 +23,7 @@ public:
void removeFile(char* name);
void closefile(bool store_location=false);
void release();
void openAndPrintFile(const char *name);
void startFileprint();
void pauseSDPrint();
void getStatus();

2
Marlin/stepper.cpp
View file

@ -611,7 +611,7 @@ ISR(TIMER1_COMPA_vect) {
current_block = NULL;
plan_discard_current_block();
#ifdef SD_FINISHED_RELEASECOMMAND
if ((cleaning_buffer_counter == 1) && (SD_FINISHED_STEPPERRELEASE)) enqueuecommands_P(PSTR(SD_FINISHED_RELEASECOMMAND));
if ((cleaning_buffer_counter == 1) && (SD_FINISHED_STEPPERRELEASE)) enqueue_and_echo_commands_P(PSTR(SD_FINISHED_RELEASECOMMAND));
#endif
cleaning_buffer_counter--;
OCR1A = 200;

17
Marlin/ultralcd.cpp
View file

@ -479,7 +479,7 @@ static void lcd_main_menu() {
*/
void lcd_set_home_offsets() {
// M428 Command
enqueuecommands_P(PSTR("M428"));
enqueue_and_echo_commands_P(PSTR("M428"));
lcd_return_to_status();
}
@ -1530,7 +1530,7 @@ menu_edit_type(unsigned long, long5, ftostr5, 0.01)
lcd_move_y();
}
static void reprapworld_keypad_move_home() {
enqueuecommands_P((PSTR("G28"))); // move all axis home
enqueue_and_echo_commands_P((PSTR("G28"))); // move all axis home
}
#endif // REPRAPWORLD_KEYPAD
@ -1582,18 +1582,13 @@ void lcd_quick_feedback() {
*/
static void menu_action_back(menuFunc_t func) { lcd_goto_menu(func); }
static void menu_action_submenu(menuFunc_t func) { lcd_save_previous_menu(); lcd_goto_menu(func); }
static void menu_action_gcode(const char* pgcode) { enqueuecommands_P(pgcode); }
static void menu_action_gcode(const char* pgcode) { enqueue_and_echo_commands_P(pgcode); }
static void menu_action_function(menuFunc_t func) { (*func)(); }
#if ENABLED(SDSUPPORT)
static void menu_action_sdfile(const char* filename, char* longFilename) {
char cmd[30];
char* c;
sprintf_P(cmd, PSTR("M23 %s"), filename);
for (c = &cmd[4]; *c; c++) *c = tolower(*c);
enqueuecommand(cmd);
enqueuecommands_P(PSTR("M24"));
card.openAndPrintFile(filename);
lcd_return_to_status();
}
@ -2339,7 +2334,7 @@ char* ftostr52(const float& x) {
current_position[Z_AXIS] = MESH_HOME_SEARCH_Z;
line_to_current(Z_AXIS);
mbl.active = 1;
enqueuecommands_P(PSTR("G28"));
enqueue_and_echo_commands_P(PSTR("G28"));
lcd_return_to_status();
}
else {
@ -2383,7 +2378,7 @@ char* ftostr52(const float& x) {
static void lcd_level_bed() {
axis_known_position[X_AXIS] = axis_known_position[Y_AXIS] = axis_known_position[Z_AXIS] = false;
mbl.reset();
enqueuecommands_P(PSTR("G28"));
enqueue_and_echo_commands_P(PSTR("G28"));
lcdDrawUpdate = 2;
lcd_goto_menu(_lcd_level_bed_homing);
}