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#include <arpa/inet.h>
#include <string>
#include <map>
#include <vector>
#include <errno.h>
#include <fcntl.h>
#include <linux/videodev2.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <syslog.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include "defines.h"
#include "error.h"
#include "random_source.h"
#include "log.h"
#include "encrypt_stream.h"
#include "hasher.h"
#include "protocol.h"
#include "server_utils.h"
#include "utils.h"
#include "statistics.h"
#include "statistics_global.h"
#include "statistics_user.h"
#include "users.h"
#include "auth.h"
const char *server_type = "server_v4l v" VERSION;
const char *pid_file = PID_DIR "/server_v4l.pid";
bool do_exit = false;
#define RES_LOW 0
#define RES_HIGH 127
void sig_handler(int sig)
{
fprintf(stderr, "Exit due to signal %d\n", sig);
do_exit = true;
}
void open_dev(char *dev_name, int *fd, unsigned char **io_buffer, int *io_buffer_len)
{
*fd = open(dev_name, O_RDWR);
if (*fd == -1)
return;
struct v4l2_capability cap;
memset(&cap, 0x00, sizeof cap);
if (ioctl(*fd, VIDIOC_QUERYCAP, &cap) == -1)
error_exit("Cannot VIDIOC_QUERYCAP");
else
{
dolog(LOG_DEBUG, "Device %s is:", dev_name);
dolog(LOG_DEBUG, " %s %s %s", cap.driver, cap.card, cap.bus_info);
dolog(LOG_DEBUG, " version: %d %d %d", (cap.version >> 16) & 255, (cap.version >> 8) & 255, cap.version & 255);
if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0)
error_exit("Video4linux device cannot capture video");
}
struct v4l2_format fmt;
memset(&fmt, 0x00, sizeof fmt);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUV420;
if (ioctl(*fd, VIDIOC_G_FMT, &fmt) == -1)
error_exit("ioctl(VIDIOC_G_FMT) failed");
char format[5];
memcpy(format, &fmt.fmt.pix.pixelformat, 4);
format[4]=0x00;
dolog(LOG_DEBUG, " %dx%d: %d/%s\n", fmt.fmt.pix.width, fmt.fmt.pix.height, fmt.type, format);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl(*fd, VIDIOC_S_FMT, &fmt) == -1)
error_exit("ioctl(VIDIOC_S_FMT) failed");
struct v4l2_requestbuffers req;
memset(&req, 0x00, sizeof req);
req.count = 1;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
if (ioctl(*fd, VIDIOC_REQBUFS, &req) == -1)
error_exit("ioctl(VIDIOC_REQBUFS) failed");
struct v4l2_buffer buf;
memset(&buf, 0x00, sizeof buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = 0;
if (ioctl(*fd, VIDIOC_QUERYBUF, &buf) == -1)
error_exit("ioctl(VIDIOC_QUERYBUF) failed");
if (ioctl(*fd, VIDIOC_QBUF, &buf) == -1)
error_exit("ioctl(VIDIOC_QBUF) failed");
enum v4l2_buf_type buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (ioctl(*fd, VIDIOC_STREAMON, &buf_type) == -1)
error_exit("ioctl(VIDIOC_STREAMON) failed");
*io_buffer_len = buf.length;
dolog(LOG_DEBUG, "%d bytes", *io_buffer_len);
*io_buffer = static_cast<unsigned char *>(mmap(NULL, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED, *fd, buf.m.offset));
if (!*io_buffer)
dolog(LOG_CRIT, "mmap() failed %s", strerror(errno));
}
void close_device(int fd, unsigned char *p, int p_len)
{
munmap(p, p_len);
close(fd);
}
void take_picture(int fd, struct v4l2_buffer *buf)
{
if (ioctl(fd, VIDIOC_DQBUF, buf) == -1)
dolog(LOG_CRIT, "VIDIOC_DQBUF failed %s", strerror(errno));
}
void untake_picture(int fd, struct v4l2_buffer *buf)
{
if (ioctl(fd, VIDIOC_QBUF, buf) == -1)
dolog(LOG_CRIT, "VIDIOC_QBUF failed %s", strerror(errno));
}
void help(void)
{
printf("-I host entropy_broker host to connect to\n");
printf(" e.g. host\n");
printf(" host:port\n");
printf(" [ipv6 literal]:port\n");
printf(" you can have multiple entries of this\n");
printf("-d x device to use\n");
printf("-o file file to write entropy data to (mututal exclusive with -d)\n");
printf("-f x skip x frames before processing images (in case the device\n");
printf(" needs a few frames to settle)\n");
printf("-l file log to file 'file'\n");
printf("-L x log level, 0=nothing, 255=all\n");
printf("-s log to syslog\n");
printf("-n do not fork\n");
printf("-S show bps (mutual exclusive with -n)\n");
printf("-P file write pid to file\n");
printf("-X file read username+password from file\n");
}
int main(int argc, char *argv[])
{
int device_settle = 25;
int c;
unsigned char *img1, *img2, *unbiased;
bool do_not_fork = false, log_console = false, log_syslog = false;
char *log_logfile = NULL;
char *device = NULL;
char *bytes_file = NULL;
int loop;
bool show_bps = false;
std::string username, password;
std::vector<std::string> hosts;
int log_level = LOG_INFO;
fprintf(stderr, "%s, (C) 2009-2015 by folkert@vanheusden.com\n", server_type);
while((c = getopt(argc, argv, "hSX:P:f:o:I:d:L:l:sn")) != -1)
{
switch(c)
{
case 'S':
show_bps = true;
break;
case 'X':
get_auth_from_file(optarg, username, password);
break;
case 'P':
pid_file = optarg;
break;
case 'f':
device_settle = atoi(optarg);
if (device_settle < 0)
error_exit("-f requires a value >= 0");
break;
case 'o':
bytes_file = optarg;
break;
case 'I':
hosts.push_back(optarg);
break;
case 'd':
device = optarg;
break;
case 's':
log_syslog = true;
break;
case 'L':
log_level = atoi(optarg);
break;
case 'l':
log_logfile = optarg;
break;
case 'n':
do_not_fork = true;
log_console = true;
break;
default:
help();
return 1;
}
}
if (!hosts.empty() && (username.length() == 0 || password.length() == 0))
error_exit("please select a file with authentication parameters (username + password) using the -X switch");
if (hosts.empty() && !bytes_file)
error_exit("no host to connect to or file to write to given");
if (!device)
error_exit("Please select a video4linux video device (a webcam, tv-card, etc.)\ne.g.: -d /dev/vide0");
(void)umask(0177);
no_core();
set_logging_parameters(log_console, log_logfile, log_syslog, log_level);
signal(SIGHUP , SIG_IGN);
signal(SIGTERM, sig_handler);
signal(SIGINT , sig_handler);
signal(SIGQUIT, sig_handler);
signal(SIGPIPE, SIG_IGN);
if (!do_not_fork)
{
if (daemon(0, 0) == -1)
error_exit("fork failed - out of resources?");
}
write_pid(pid_file);
protocol *p = NULL;
if (!hosts.empty())
p = new protocol(&hosts, username, password, true, server_type, DEFAULT_COMM_TO);
/* open device */
int fd = -1;
unsigned char *io_buffer = NULL;
int io_buffer_len = -1;
open_dev(device, &fd, &io_buffer, &io_buffer_len);
if (fd == -1)
error_exit("failure opening %s", device);
/* let device settle */
dolog(LOG_DEBUG, "waiting for device to settle");
for(loop=0; loop<device_settle; loop++)
{
struct v4l2_buffer buf;
memset(&buf, 0x00, sizeof buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
take_picture(fd, &buf);
untake_picture(fd, &buf);
}
init_showbps();
set_showbps_start_ts();
unsigned char cur_byte = 0;
for(;!do_exit;)
{
img1 = reinterpret_cast<unsigned char *>(malloc_locked(io_buffer_len));
img2 = reinterpret_cast<unsigned char *>(malloc_locked(io_buffer_len));
unbiased = reinterpret_cast<unsigned char *>(malloc_locked(io_buffer_len));
if (!img1 || !img2 || !unbiased)
error_exit("out of memory");
struct v4l2_buffer buf;
/* take pictures */
dolog(LOG_DEBUG, "Smile!");
memset(&buf, 0x00, sizeof buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
take_picture(fd, &buf);
memcpy(img1, io_buffer, io_buffer_len);
untake_picture(fd, &buf);
//
memset(&buf, 0x00, sizeof buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
take_picture(fd, &buf);
memcpy(img2, io_buffer, io_buffer_len);
untake_picture(fd, &buf);
/* unbiase */
dolog(LOG_DEBUG, "Filtering...");
int nunbiased=0, nbits = 0;
for(loop=0; loop<io_buffer_len; loop+=2)
{
/* calculate difference between the images */
int diff1 = abs(img2[loop + 0] - img1[loop + 0]);
int diff2 = abs(img2[loop + 1] - img1[loop + 1]);
/* if the 2 difference are not correlated, add bit */
if ((diff1 & 1) != (diff2 & 1))
{
cur_byte <<= 1;
if (diff1 & 1)
cur_byte |= 1;
nbits++;
if (nbits == 8)
{
unbiased[nunbiased++] = cur_byte;
nbits = 0;
}
}
}
free_locked(img2, io_buffer_len);
free_locked(img1, io_buffer_len);
dolog(LOG_DEBUG, "got %d bytes of entropy", nunbiased);
if (nunbiased > 0)
{
if (show_bps)
update_showbps(nunbiased);
if (bytes_file)
emit_buffer_to_file(bytes_file, unbiased, nunbiased);
if (p)
{
unsigned char *tempp = unbiased;
int count = nunbiased;
while(count > 0)
{
int n_to_do = std::min(count, 4096);
if (p -> message_transmit_entropy_data(tempp, n_to_do, &do_exit) == -1)
{
dolog(LOG_INFO, "connection closed");
p -> drop();
break;
}
tempp += n_to_do;
count -= n_to_do;
}
}
set_showbps_start_ts();
}
free_locked(unbiased, io_buffer_len);
}
dolog(LOG_DEBUG, "Cleaning up");
close_device(fd, io_buffer, io_buffer_len);
delete p;
unlink(pid_file);
return 0;
}
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