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mirror of https://github.com/trezor/trezor-firmware.git synced 2024-12-23 23:08:14 +00:00
trezor-firmware/embed/unix/usb.c

198 lines
5.5 KiB
C

/*
* Copyright (c) Pavol Rusnak, SatoshiLabs
*
* Licensed under TREZOR License
* see LICENSE file for details
*/
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/poll.h>
#include <fcntl.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "usb.h"
#include "touch.h"
void __attribute__((noreturn)) __fatal_error(const char *expr, const char *msg, const char *file, int line, const char *func);
#define ensure(expr, msg) (((expr) == sectrue) ? (void)0 : __fatal_error(#expr, msg, __FILE__, __LINE__, __func__))
// emulator opens UDP server on TREZOR_UDP_PORT port
// and emulates HID/WebUSB interface TREZOR_UDP_IFACE
// gracefully ignores all other USB interfaces
#define TREZOR_UDP_IFACE 0
#define TREZOR_UDP_PORT 21324
static usb_iface_type_t emulator_usb_iface_type = USB_IFACE_TYPE_DISABLED;
static int sock = -1;
static struct sockaddr_in si_me, si_other;
static socklen_t slen = 0;
void usb_init(const usb_dev_info_t *dev_info) {
(void)dev_info;
}
void usb_deinit(void) {
}
void usb_start(void) {
// start server only if interface 0 is either HID or WebUSB
if (emulator_usb_iface_type == USB_IFACE_TYPE_HID || emulator_usb_iface_type == USB_IFACE_TYPE_WEBUSB) {
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
ensure(sectrue * (sock >= 0), NULL);
fcntl(sock, F_SETFL, O_NONBLOCK);
si_me.sin_family = AF_INET;
const char *ip = getenv("TREZOR_UDP_IP");
if (ip) {
si_me.sin_addr.s_addr = inet_addr(ip);
} else {
si_me.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
}
const char *port = getenv("TREZOR_UDP_PORT");
if (port) {
si_me.sin_port = htons(atoi(port));
} else {
si_me.sin_port = htons(TREZOR_UDP_PORT);
}
ensure(sectrue * (0 == bind(sock, (struct sockaddr*)&si_me, sizeof(si_me))), NULL);
}
}
void usb_stop(void) {
}
secbool usb_hid_add(const usb_hid_info_t *info) {
// store iface type if it is the emulated iface
if (info->iface_num == TREZOR_UDP_IFACE) {
emulator_usb_iface_type = USB_IFACE_TYPE_HID;
}
return sectrue;
}
secbool usb_webusb_add(const usb_webusb_info_t *info) {
// store iface type if it is the emulated iface
if (info->iface_num == TREZOR_UDP_IFACE) {
emulator_usb_iface_type = USB_IFACE_TYPE_WEBUSB;
}
return sectrue;
}
secbool usb_vcp_add(const usb_vcp_info_t *info) {
return sectrue;
}
static secbool usb_emulated_can_read(uint8_t iface_num) {
struct pollfd fds[] = {
{ sock, POLLIN, 0 },
};
int r = poll(fds, 1, 0);
return sectrue * (r > 0);
}
secbool usb_hid_can_read(uint8_t iface_num) {
if (iface_num != TREZOR_UDP_IFACE || emulator_usb_iface_type != USB_IFACE_TYPE_HID) {
return secfalse;
}
return usb_emulated_can_read(iface_num);
}
secbool usb_webusb_can_read(uint8_t iface_num) {
if (iface_num != TREZOR_UDP_IFACE || emulator_usb_iface_type != USB_IFACE_TYPE_WEBUSB) {
return secfalse;
}
return usb_emulated_can_read(iface_num);
}
static secbool usb_emulated_can_write(uint8_t iface_num) {
struct pollfd fds[] = {
{ sock, POLLOUT, 0 },
};
int r = poll(fds, 1, 0);
return sectrue * (r > 0);
}
secbool usb_hid_can_write(uint8_t iface_num) {
if (iface_num != TREZOR_UDP_IFACE || emulator_usb_iface_type != USB_IFACE_TYPE_HID) {
return secfalse;
}
return usb_emulated_can_write(iface_num);
}
secbool usb_webusb_can_write(uint8_t iface_num) {
if (iface_num != TREZOR_UDP_IFACE || emulator_usb_iface_type != USB_IFACE_TYPE_WEBUSB) {
return secfalse;
}
return usb_emulated_can_write(iface_num);
}
static int usb_emulated_read(uint8_t iface_num, uint8_t *buf, uint32_t len) {
struct sockaddr_in si;
socklen_t sl = sizeof(si);
ssize_t r = recvfrom(sock, buf, len, MSG_DONTWAIT, (struct sockaddr *)&si, &sl);
if (r < 0) {
return r;
}
si_other = si;
slen = sl;
static const char *ping_req = "PINGPING";
static const char *ping_resp = "PONGPONG";
if (r == strlen(ping_req) && 0 == memcmp(ping_req, buf, strlen(ping_req))) {
if (slen > 0) {
sendto(sock, ping_resp, strlen(ping_resp), MSG_DONTWAIT, (const struct sockaddr *)&si_other, slen);
}
return 0;
}
return r;
}
int usb_hid_read(uint8_t iface_num, uint8_t *buf, uint32_t len) {
if (iface_num != TREZOR_UDP_IFACE || emulator_usb_iface_type != USB_IFACE_TYPE_HID) {
return 0;
}
return usb_emulated_read(iface_num, buf, len);
}
int usb_webusb_read(uint8_t iface_num, uint8_t *buf, uint32_t len) {
if (iface_num != TREZOR_UDP_IFACE || emulator_usb_iface_type != USB_IFACE_TYPE_WEBUSB) {
return 0;
}
return usb_emulated_read(iface_num, buf, len);
}
static int usb_emulated_write(uint8_t iface_num, const uint8_t *buf, uint32_t len)
{
ssize_t r = len;
if (slen > 0) {
r = sendto(sock, buf, len, MSG_DONTWAIT, (const struct sockaddr *)&si_other, slen);
}
return r;
}
int usb_hid_write(uint8_t iface_num, const uint8_t *buf, uint32_t len) {
if (iface_num != TREZOR_UDP_IFACE || emulator_usb_iface_type != USB_IFACE_TYPE_HID) {
return 0;
}
return usb_emulated_write(iface_num, buf, len);
}
int usb_webusb_write(uint8_t iface_num, const uint8_t *buf, uint32_t len) {
if (iface_num != TREZOR_UDP_IFACE || emulator_usb_iface_type != USB_IFACE_TYPE_WEBUSB) {
return 0;
}
return usb_emulated_write(iface_num, buf, len);
}
void pendsv_kbd_intr(void) {
}
void mp_hal_set_vcp_iface(int iface_num) {
}