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/**
* This file is part of libsamsung-ipc.
*
* Copyright (C) 2012 Simon Busch <morphis@gravedo.de>
*
* libsamsung-ipc is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* libsamsung-ipc 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with libsamsung-ipc. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <termios.h>
#include <strings.h>
#include <getopt.h>
#define IOCTL_MODEM_SEND _IO('o', 0x23)
#define IOCTL_MODEM_RECV _IO('o', 0x24)
struct modem_io {
uint32_t size;
uint32_t id;
uint32_t cmd;
void *data;
};
void forward_data(int modem_fd, int remote_fd)
{
fd_set rfds;
int rc, max_fd;
unsigned char buf[4096];
max_fd = modem_fd > remote_fd ? modem_fd + 1 : remote_fd + 1;
while(1) {
FD_ZERO(&rfds);
FD_SET(modem_fd, &rfds);
FD_SET(remote_fd, &rfds);
rc = select(max_fd, &rfds, NULL, NULL, NULL);
if (rc == -1) {
perror("select()");
break;
}
else if (rc) {
if (FD_ISSET(modem_fd, &rfds)) {
rc = ioctl(modem_fd, IOCTL_MODEM_RECV, &buf);
if (rc < 0)
break;
ssize_t size = ((struct modem_io*) &buf)->size;
printf("Sending from modem %ld\n", size);
ssize_t written = write(remote_fd, &buf, size);
}
else if (FD_ISSET(remote_fd, &rfds)) {
ssize_t size = read(remote_fd, &buf, sizeof(buf));
if (size <= 0)
break;
printf("Sending from destination %ld\n", size);
ssize_t written = ioctl(modem_fd, IOCTL_MODEM_SEND, &buf);
}
}
}
}
int init_network_connection(int port)
{
int socket_fd = socket(PF_INET, SOCK_STREAM, 0);
if (socket_fd < 0) {
perror("Failed to create network socket");
return EXIT_FAILURE;
}
int opt = 1;
if (setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, (char*)&opt, sizeof(opt)) == -1) {
perror("Warning: can't set SO_REUSEADDR");
}
struct sockaddr_in addr = { 0, };
addr.sin_family = PF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(socket_fd, (struct sockaddr*) &addr, sizeof(addr)) == -1) {
perror("Error while binding socket");
goto socket_init_failed;
}
if (listen(socket_fd, 1) == -1) {
perror("Error while started listing on socket");
goto socket_init_failed;
}
return socket_fd;
socket_init_failed:
close(socket_fd);
return -1;
}
int main(int argc, char **argv)
{
opterr = 0;
int option_index;
int chr;
char serial_node[30] = "\0";
int network_port;
int show_help = 0;
int modem_fd = 0, socket_fd = 0;
struct option opts[] = {
{ "node", required_argument, 0, 'n' },
{ "port", required_argument, 0, 'p' },
{ "help", no_argument, 0, 'h' },
};
while (1) {
option_index = 0;
chr = getopt_long(argc, argv, "n:p:h", opts, &option_index);
if (chr == -1)
break;
switch (chr) {
case 'h':
show_help = 1;
break;
case 'n':
snprintf(serial_node, 30, "%s", optarg);
break;
case 'p':
network_port = atoi(optarg);
break;
default:
break;
}
}
if (show_help || network_port == 0 || serial_node[0] == 0) {
printf("usage: samsung_ipc_forward -n <device node> -p <network port>\n");
exit(1);
}
socket_fd = init_network_connection(network_port);
if (socket_fd < 0)
return EXIT_FAILURE;
modem_fd = open(serial_node, O_RDWR | O_NOCTTY | O_NONBLOCK);
int connection_fd = -1;
struct sockaddr_in addr = { 0, };
socklen_t length = sizeof(addr);
while ((connection_fd = accept(socket_fd, (struct sockaddr*) &addr, &length)) >= 0) {
printf("New connection from: '%s'\n", inet_ntoa(addr.sin_addr));
forward_data(modem_fd, connection_fd);
close(connection_fd);
}
close(modem_fd);
close(socket_fd);
return 0;
socket_init_failed:
close(socket_fd);
return EXIT_FAILURE;
}
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