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252 lines
7.5 KiB
252 lines
7.5 KiB
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <arpa/inet.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/poll.h>
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#include <sys/socket.h>
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#include <time.h>
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#include "touch.h"
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#include "usb.h"
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#include "memzero.h"
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void __attribute__((noreturn))
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__fatal_error(const char *expr, const char *msg, const char *file, int line,
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const char *func);
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#define ensure(expr, msg) \
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(((expr) == sectrue) \
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? (void)0 \
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: __fatal_error(#expr, msg, __FILE__, __LINE__, __func__))
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// emulator opens UDP server and emulates HID/WebUSB interfaces
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// gracefully ignores all other USB interfaces
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#define USBD_MAX_NUM_INTERFACES 8
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static struct {
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usb_iface_type_t type;
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uint16_t port;
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int sock;
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struct sockaddr_in si_me, si_other;
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socklen_t slen;
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} usb_ifaces[USBD_MAX_NUM_INTERFACES];
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void usb_init(const usb_dev_info_t *dev_info) {
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(void)dev_info;
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for (int i = 0; i < USBD_MAX_NUM_INTERFACES; i++) {
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usb_ifaces[i].type = USB_IFACE_TYPE_DISABLED;
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usb_ifaces[i].port = 0;
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usb_ifaces[i].sock = -1;
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memzero(&usb_ifaces[i].si_me, sizeof(struct sockaddr_in));
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memzero(&usb_ifaces[i].si_other, sizeof(struct sockaddr_in));
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usb_ifaces[i].slen = 0;
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}
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}
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void usb_deinit(void) {}
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void usb_start(void) {
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const char *ip = getenv("TREZOR_UDP_IP");
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// iterate interfaces
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for (int i = 0; i < USBD_MAX_NUM_INTERFACES; i++) {
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// skip if not HID or WebUSB interface
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if (usb_ifaces[i].type != USB_IFACE_TYPE_HID &&
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usb_ifaces[i].type != USB_IFACE_TYPE_WEBUSB) {
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continue;
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}
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usb_ifaces[i].sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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ensure(sectrue * (usb_ifaces[i].sock >= 0), NULL);
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fcntl(usb_ifaces[i].sock, F_SETFL, O_NONBLOCK);
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usb_ifaces[i].si_me.sin_family = AF_INET;
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if (ip) {
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usb_ifaces[i].si_me.sin_addr.s_addr = inet_addr(ip);
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} else {
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usb_ifaces[i].si_me.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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}
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usb_ifaces[i].si_me.sin_port = htons(usb_ifaces[i].port);
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ensure(sectrue * (0 == bind(usb_ifaces[i].sock,
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(struct sockaddr *)&usb_ifaces[i].si_me,
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sizeof(struct sockaddr_in))),
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NULL);
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}
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}
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void usb_stop(void) {}
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secbool usb_hid_add(const usb_hid_info_t *info) {
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if (info->iface_num < USBD_MAX_NUM_INTERFACES &&
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usb_ifaces[info->iface_num].type == USB_IFACE_TYPE_DISABLED) {
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usb_ifaces[info->iface_num].type = USB_IFACE_TYPE_HID;
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usb_ifaces[info->iface_num].port = info->emu_port;
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}
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return sectrue;
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}
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secbool usb_webusb_add(const usb_webusb_info_t *info) {
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if (info->iface_num < USBD_MAX_NUM_INTERFACES &&
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usb_ifaces[info->iface_num].type == USB_IFACE_TYPE_DISABLED) {
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usb_ifaces[info->iface_num].type = USB_IFACE_TYPE_WEBUSB;
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usb_ifaces[info->iface_num].port = info->emu_port;
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}
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return sectrue;
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}
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secbool usb_vcp_add(const usb_vcp_info_t *info) {
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if (info->iface_num < USBD_MAX_NUM_INTERFACES &&
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usb_ifaces[info->iface_num].type == USB_IFACE_TYPE_DISABLED) {
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usb_ifaces[info->iface_num].type = USB_IFACE_TYPE_VCP;
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usb_ifaces[info->iface_num].port = info->emu_port;
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}
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return sectrue;
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}
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static secbool usb_emulated_poll(uint8_t iface_num, short dir) {
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struct pollfd fds[] = {
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{usb_ifaces[iface_num].sock, dir, 0},
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};
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int r = poll(fds, 1, 0);
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return sectrue * (r > 0);
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}
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static int usb_emulated_read(uint8_t iface_num, uint8_t *buf, uint32_t len) {
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struct sockaddr_in si;
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socklen_t sl = sizeof(si);
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ssize_t r = recvfrom(usb_ifaces[iface_num].sock, buf, len, MSG_DONTWAIT,
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(struct sockaddr *)&si, &sl);
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if (r < 0) {
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return r;
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}
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usb_ifaces[iface_num].si_other = si;
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usb_ifaces[iface_num].slen = sl;
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static const char *ping_req = "PINGPING";
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static const char *ping_resp = "PONGPONG";
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if (r == strlen(ping_req) && 0 == memcmp(ping_req, buf, strlen(ping_req))) {
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if (usb_ifaces[iface_num].slen > 0) {
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sendto(usb_ifaces[iface_num].sock, ping_resp, strlen(ping_resp),
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MSG_DONTWAIT,
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(const struct sockaddr *)&usb_ifaces[iface_num].si_other,
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usb_ifaces[iface_num].slen);
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}
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return 0;
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}
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return r;
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}
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static int usb_emulated_write(uint8_t iface_num, const uint8_t *buf,
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uint32_t len) {
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ssize_t r = len;
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if (usb_ifaces[iface_num].slen > 0) {
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r = sendto(usb_ifaces[iface_num].sock, buf, len, MSG_DONTWAIT,
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(const struct sockaddr *)&usb_ifaces[iface_num].si_other,
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usb_ifaces[iface_num].slen);
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}
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return r;
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}
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secbool usb_hid_can_read(uint8_t iface_num) {
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if (iface_num >= USBD_MAX_NUM_INTERFACES ||
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usb_ifaces[iface_num].type != USB_IFACE_TYPE_HID) {
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return secfalse;
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}
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return usb_emulated_poll(iface_num, POLLIN);
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}
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secbool usb_webusb_can_read(uint8_t iface_num) {
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if (iface_num >= USBD_MAX_NUM_INTERFACES ||
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usb_ifaces[iface_num].type != USB_IFACE_TYPE_WEBUSB) {
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return secfalse;
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}
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return usb_emulated_poll(iface_num, POLLIN);
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}
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secbool usb_hid_can_write(uint8_t iface_num) {
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if (iface_num >= USBD_MAX_NUM_INTERFACES ||
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usb_ifaces[iface_num].type != USB_IFACE_TYPE_HID) {
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return secfalse;
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}
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return usb_emulated_poll(iface_num, POLLOUT);
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}
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secbool usb_webusb_can_write(uint8_t iface_num) {
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if (iface_num >= USBD_MAX_NUM_INTERFACES ||
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usb_ifaces[iface_num].type != USB_IFACE_TYPE_WEBUSB) {
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return secfalse;
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}
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return usb_emulated_poll(iface_num, POLLOUT);
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}
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int usb_hid_read(uint8_t iface_num, uint8_t *buf, uint32_t len) {
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if (iface_num >= USBD_MAX_NUM_INTERFACES ||
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usb_ifaces[iface_num].type != USB_IFACE_TYPE_HID) {
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return 0;
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}
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return usb_emulated_read(iface_num, buf, len);
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}
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int usb_webusb_read(uint8_t iface_num, uint8_t *buf, uint32_t len) {
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if (iface_num >= USBD_MAX_NUM_INTERFACES ||
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usb_ifaces[iface_num].type != USB_IFACE_TYPE_WEBUSB) {
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return 0;
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}
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return usb_emulated_read(iface_num, buf, len);
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}
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int usb_hid_write(uint8_t iface_num, const uint8_t *buf, uint32_t len) {
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if (iface_num >= USBD_MAX_NUM_INTERFACES ||
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usb_ifaces[iface_num].type != USB_IFACE_TYPE_HID) {
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return 0;
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}
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return usb_emulated_write(iface_num, buf, len);
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}
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int usb_hid_write_blocking(uint8_t iface_num, const uint8_t *buf, uint32_t len,
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int timeout) {
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const uint32_t start = clock();
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while (sectrue != usb_hid_can_write(iface_num)) {
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if (timeout >= 0 &&
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(1000 * (clock() - start)) / CLOCKS_PER_SEC >= timeout) {
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return 0; // Timeout
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}
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}
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return usb_hid_write(iface_num, buf, len);
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}
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int usb_webusb_write(uint8_t iface_num, const uint8_t *buf, uint32_t len) {
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if (iface_num >= USBD_MAX_NUM_INTERFACES ||
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usb_ifaces[iface_num].type != USB_IFACE_TYPE_WEBUSB) {
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return 0;
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}
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return usb_emulated_write(iface_num, buf, len);
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}
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void pendsv_kbd_intr(void) {}
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void mp_hal_set_vcp_iface(int iface_num) {}
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