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bootloader: parse incoming protobuf messages

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This commit is contained in:
Pavol Rusnak 2017-06-19 14:20:09 +02:00
parent fe672fbd09
commit 46c26b8c09
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GPG Key ID: 91F3B339B9A02A3D
2 changed files with 136 additions and 72 deletions
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3
.gitignore vendored
View File

@ -2,4 +2,5 @@
_attic/
vendor/src/
emu.config
__pycache__
__pycache__/
.mypy_cache/

205
micropython/bootloader/messages.c
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@ -1,3 +1,4 @@
#include <pb_decode.h>
#include <pb_encode.h>
#include "messages.pb.h"
@ -6,8 +7,6 @@
#include "messages.h"
// DECODE
bool msg_parse_header(const uint8_t *buf, uint16_t *msg_id, uint32_t *msg_size)
{
if (buf[0] != '?' || buf[1] != '#' || buf[2] != '#') {
@ -18,8 +17,6 @@ bool msg_parse_header(const uint8_t *buf, uint16_t *msg_id, uint32_t *msg_size)
return true;
}
// ENCODE
typedef struct {
uint8_t iface_num;
uint8_t packet_index;
@ -60,7 +57,7 @@ static bool _usb_write(pb_ostream_t *stream, const pb_byte_t *buf, size_t count)
return true;
}
static void _usb_flush(usb_write_state *state)
static void _usb_write_flush(usb_write_state *state)
{
// if packet is not filled up completely
if (state->packet_pos < USB_PACKET_SIZE) {
@ -108,7 +105,7 @@ static bool _send_msg(uint8_t iface_num, uint16_t msg_id, const pb_field_t field
return false;
}
_usb_flush(&state);
_usb_write_flush(&state);
return true;
}
@ -121,81 +118,147 @@ static bool _encode_string(pb_ostream_t *stream, const pb_field_t *field, void *
return pb_encode_string(stream, *arg, strlen(*arg));
}
#define MSG_INIT(TYPE) TYPE msg = TYPE##_init_default
#define MSG_ASSIGN_VALUE(FIELD, VALUE) do { msg.has_##FIELD = true; msg.FIELD = VALUE; } while (0)
#define MSG_ASSIGN_STRING(FIELD, VALUE) do { msg.FIELD.funcs.encode = &_encode_string; msg.FIELD.arg = VALUE; } while (0)
#define MSG_SEND(TYPE) do { _send_msg(iface_num, MessageType_MessageType_##TYPE, TYPE##_fields, &msg); } while (0)
#define MSG_SEND_INIT(TYPE) TYPE msg_send = TYPE##_init_default
#define MSG_SEND_ASSIGN_VALUE(FIELD, VALUE) do { msg_send.has_##FIELD = true; msg_send.FIELD = VALUE; } while (0)
#define MSG_SEND_ASSIGN_STRING(FIELD, VALUE) do { msg_send.FIELD.funcs.encode = &_encode_string; msg_send.FIELD.arg = VALUE; } while (0)
#define MSG_SEND(TYPE) do { _send_msg(iface_num, MessageType_MessageType_##TYPE, TYPE##_fields, &msg_send); } while (0)
static void consume_message(uint8_t iface_num, uint32_t msg_size, uint8_t *buf, void (* consumer)(const uint8_t *buf, uint8_t len))
typedef struct {
uint8_t iface_num;
uint8_t packet_index;
uint8_t packet_pos;
uint8_t *buf;
} usb_read_state;
static bool _usb_read(pb_istream_t *stream, uint8_t *buf, size_t count)
{
if (consumer) {
consumer(buf + MSG_HEADER1_LEN, USB_PACKET_SIZE - MSG_HEADER1_LEN);
usb_read_state *state = (usb_read_state *)(stream->state);
size_t read = 0;
// while we have data left
while (read < count) {
size_t remaining = count - read;
// if all remaining data fit into our packet
if (state->packet_pos + remaining <= USB_PACKET_SIZE) {
// append data from buf to state->buf
memcpy(buf + read, state->buf + state->packet_pos, remaining);
// advance position
state->packet_pos += remaining;
// and return
return true;
} else {
// append data that fits
memcpy(buf + read, state->buf + state->packet_pos, USB_PACKET_SIZE - state->packet_pos);
read += USB_PACKET_SIZE - state->packet_pos;
// read next packet
usb_hid_write_blocking(state->iface_num, state->buf, USB_PACKET_SIZE, 1);
// prepare next packet
state->packet_index++;
state->packet_pos = MSG_HEADER2_LEN;
}
}
return true;
}
static void _usb_read_flush(usb_read_state *state)
{
(void)state;
}
static bool _recv_msg(uint8_t iface_num, uint32_t msg_size, uint8_t *buf, const pb_field_t fields[], void *msg)
{
usb_read_state state = {
.iface_num = iface_num,
.packet_index = 0,
.packet_pos = MSG_HEADER1_LEN,
.buf = buf
};
pb_istream_t stream = {
.callback = &_usb_read,
.state = &state,
.bytes_left = msg_size,
.errmsg = NULL
};
if (!pb_decode(&stream, fields, msg)) {
return false;
}
_usb_read_flush(&state);
return true;
}
#define MSG_RECV_INIT(TYPE) TYPE msg_recv = TYPE##_init_zero
#define MSG_RECV(TYPE) do { _recv_msg(iface_num, msg_size, buf, TYPE##_fields, &msg_recv); } while(0)
void process_msg_Initialize(uint8_t iface_num, uint32_t msg_size, uint8_t *buf)
{
MSG_RECV_INIT(Initialize);
MSG_RECV(Initialize);
MSG_SEND_INIT(Features);
MSG_SEND_ASSIGN_STRING(vendor, "trezor.io");
MSG_SEND_ASSIGN_VALUE(major_version, VERSION_MAJOR);
MSG_SEND_ASSIGN_VALUE(minor_version, VERSION_MINOR);
MSG_SEND_ASSIGN_VALUE(patch_version, VERSION_PATCH);
MSG_SEND_ASSIGN_VALUE(bootloader_mode, true);
// TODO: properly detect firmware
MSG_SEND_ASSIGN_VALUE(firmware_present, false);
MSG_SEND(Features);
}
void process_msg_Ping(uint8_t iface_num, uint32_t msg_size, uint8_t *buf)
{
MSG_RECV_INIT(Ping);
MSG_RECV(Ping);
MSG_SEND_INIT(Success);
// TODO: read message from Ping
MSG_SEND_ASSIGN_STRING(message, "PONG!");
MSG_SEND(Success);
}
void process_msg_FirmwareErase(uint8_t iface_num, uint32_t msg_size, uint8_t *buf)
{
MSG_RECV_INIT(FirmwareErase);
MSG_RECV(FirmwareErase);
// TODO: implement
MSG_SEND_INIT(Failure);
MSG_SEND_ASSIGN_VALUE(code, FailureType_Failure_FirmwareError);
MSG_SEND_ASSIGN_STRING(message, "Unsupported message");
MSG_SEND(Failure);
}
void process_msg_FirmwareUpload(uint8_t iface_num, uint32_t msg_size, uint8_t *buf)
{
MSG_RECV_INIT(FirmwareUpload);
MSG_RECV(FirmwareUpload);
// TODO: implement
MSG_SEND_INIT(Failure);
MSG_SEND_ASSIGN_VALUE(code, FailureType_Failure_FirmwareError);
MSG_SEND_ASSIGN_STRING(message, "Unsupported message");
MSG_SEND(Failure);
}
void process_msg_unknown(uint8_t iface_num, uint32_t msg_size, uint8_t *buf)
{
// consume remaining message
int remaining_chunks = (msg_size - (USB_PACKET_SIZE - MSG_HEADER1_LEN)) / (USB_PACKET_SIZE - MSG_HEADER2_LEN);
for (int i = 0; i < remaining_chunks; i++) {
int r = usb_hid_read_blocking(USB_IFACE_NUM, buf, USB_PACKET_SIZE, 100);
if (r != USB_PACKET_SIZE) {
break;
}
if (consumer) {
consumer(buf + MSG_HEADER2_LEN, USB_PACKET_SIZE - MSG_HEADER2_LEN);
}
}
}
void process_msg_Initialize(uint8_t iface_num, uint32_t msg_size, uint8_t *buf)
{
consume_message(iface_num, msg_size, buf, NULL);
MSG_INIT(Features);
MSG_ASSIGN_STRING(vendor, "trezor.io");
MSG_ASSIGN_VALUE(major_version, VERSION_MAJOR);
MSG_ASSIGN_VALUE(minor_version, VERSION_MINOR);
MSG_ASSIGN_VALUE(patch_version, VERSION_PATCH);
MSG_ASSIGN_VALUE(bootloader_mode, true);
// TODO: properly detect firmware
MSG_ASSIGN_VALUE(firmware_present, false);
MSG_SEND(Features);
}
void process_msg_Ping(uint8_t iface_num, uint32_t msg_size, uint8_t *buf)
{
consume_message(iface_num, msg_size, buf, NULL);
MSG_INIT(Success);
// TODO: read message from Ping
MSG_ASSIGN_STRING(message, "PONG!");
MSG_SEND(Success);
}
void process_msg_FirmwareErase(uint8_t iface_num, uint32_t msg_size, uint8_t *buf)
{
consume_message(iface_num, msg_size, buf, NULL);
// TODO: implement
MSG_INIT(Failure);
MSG_ASSIGN_VALUE(code, FailureType_Failure_FirmwareError);
MSG_ASSIGN_STRING(message, "Unsupported message");
MSG_SEND(Failure);
}
void process_msg_FirmwareUpload(uint8_t iface_num, uint32_t msg_size, uint8_t *buf)
{
consume_message(iface_num, msg_size, buf, NULL);
// TODO: implement
MSG_INIT(Failure);
MSG_ASSIGN_VALUE(code, FailureType_Failure_FirmwareError);
MSG_ASSIGN_STRING(message, "Unsupported message");
MSG_SEND(Failure);
}
void process_msg_unknown(uint8_t iface_num, uint32_t msg_size, uint8_t *buf)
{
consume_message(iface_num, msg_size, buf, NULL);
MSG_INIT(Failure);
MSG_ASSIGN_VALUE(code, FailureType_Failure_UnexpectedMessage);
MSG_ASSIGN_STRING(message, "Unexpected message");
MSG_SEND_INIT(Failure);
MSG_SEND_ASSIGN_VALUE(code, FailureType_Failure_UnexpectedMessage);
MSG_SEND_ASSIGN_STRING(message, "Unexpected message");
MSG_SEND(Failure);
}