mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-24 07:18:09 +00:00
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
|
/*
|
||
|
* This file is part of the TREZOR project, https://trezor.io/
|
||
|
*
|
||
|
* Copyright (C) 2017 Saleem Rashid <trezor@saleemrashid.com>
|
||
|
*
|
||
|
* This library is free software: you can redistribute it and/or modify
|
||
|
* it under the terms of the GNU Lesser General Public License as published by
|
||
|
* the Free Software Foundation, either version 3 of the License, or
|
||
|
* (at your option) any later version.
|
||
|
*
|
||
|
* This library is distributed in the hope that it will be useful,
|
||
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
* GNU Lesser General Public License for more details.
|
||
|
*
|
||
|
* You should have received a copy of the GNU Lesser General Public License
|
||
|
* along with this library. If not, see <http://www.gnu.org/licenses/>.
|
||
|
*/
|
||
|
|
||
|
#include <arpa/inet.h>
|
||
|
#include <errno.h>
|
||
|
#include <stdio.h>
|
||
|
#include <stdlib.h>
|
||
|
#include <string.h>
|
||
|
#include <sys/socket.h>
|
||
|
|
||
|
#define TREZOR_UDP_PORT 21324
|
||
|
|
||
|
static int fd = -1;
|
||
|
static struct sockaddr_in from;
|
||
|
static socklen_t fromlen;
|
||
|
|
||
|
void emulatorSocketInit(void) {
|
||
|
fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
||
|
if (fd < 0) {
|
||
|
perror("Failed to create socket");
|
||
|
exit(1);
|
||
|
}
|
||
|
|
||
|
fromlen = 0;
|
||
|
|
||
|
struct sockaddr_in addr;
|
||
|
addr.sin_family = AF_INET;
|
||
|
addr.sin_port = htons(TREZOR_UDP_PORT);
|
||
|
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
|
||
|
|
||
|
if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) != 0) {
|
||
|
perror("Failed to bind socket");
|
||
|
exit(1);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
size_t emulatorSocketRead(void *buffer, size_t size) {
|
||
|
fromlen = sizeof(from);
|
||
|
ssize_t n = recvfrom(fd, buffer, size, MSG_DONTWAIT, (struct sockaddr *) &from, &fromlen);
|
||
|
|
||
|
if (n < 0) {
|
||
|
if (errno != EAGAIN && errno != EWOULDBLOCK) {
|
||
|
perror("Failed to read socket");
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static const char msg_ping[] = { 'P', 'I', 'N', 'G', 'P', 'I', 'N', 'G' };
|
||
|
static const char msg_pong[] = { 'P', 'O', 'N', 'G', 'P', 'O', 'N', 'G' };
|
||
|
|
||
|
if (n == sizeof(msg_ping) && memcmp(buffer, msg_ping, sizeof(msg_ping)) == 0) {
|
||
|
emulatorSocketWrite(msg_pong, sizeof(msg_pong));
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
return n;
|
||
|
}
|
||
|
|
||
|
size_t emulatorSocketWrite(const void *buffer, size_t size) {
|
||
|
if (fromlen > 0) {
|
||
|
ssize_t n = sendto(fd, buffer, size, MSG_DONTWAIT, (const struct sockaddr *) &from, fromlen);
|
||
|
if (n < 0 || ((size_t) n) != size) {
|
||
|
perror("Failed to write socket");
|
||
|
return 0;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return size;
|
||
|
}
|