forked from idkwim/entropybroker
/
server_timers.cpp
240 lines (188 loc) · 4.67 KB
/
server_timers.cpp
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#include <arpa/inet.h>
#include <string>
#include <map>
#include <vector>
#include <sys/time.h>
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
const char *server_type = "server_timers v" VERSION;
const char *pid_file = PID_DIR "/server_timers.pid";
bool do_exit = false;
#include "defines.h"
#include "error.h"
#include "random_source.h"
#include "utils.h"
#include "log.h"
#include "encrypt_stream.h"
#include "hasher.h"
#include "protocol.h"
#include "server_utils.h"
#include "statistics.h"
#include "statistics_global.h"
#include "statistics_user.h"
#include "users.h"
#include "auth.h"
#define SLEEP_CLOCK CLOCK_MONOTONIC
void sig_handler(int sig)
{
fprintf(stderr, "Exit due to signal %d\n", sig);
do_exit = true;
}
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("-o file file to write entropy data to\n");
printf("-S show bps (mutual exclusive with -n)\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("-P file write pid to file\n");
printf("-X file read username+password from file\n");
}
int get_clock_res()
{
struct timespec ts;
if (clock_getres(SLEEP_CLOCK, &ts) == -1)
error_exit("clock_getres failed");
return ts.tv_nsec;
}
inline double gen_entropy_data(int sl)
{
double start = get_ts_ns();
const struct timespec ts = { 0, sl };
clock_nanosleep(SLEEP_CLOCK, 0, &ts, NULL);
return get_ts_ns() - start;
}
int main(int argc, char *argv[])
{
unsigned char bytes[4096];
int bits = 0, index = 0;
int c;
bool do_not_fork = false, log_console = false, log_syslog = false;
char *log_logfile = NULL;
char *bytes_file = NULL;
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, "I:hX:P:So:L:l:sn")) != -1)
{
switch(c)
{
case 'X':
get_auth_from_file(optarg, username, password);
break;
case 'P':
pid_file = optarg;
break;
case 'S':
show_bps = true;
break;
case 'o':
bytes_file = optarg;
break;
case 'I':
hosts.push_back(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;
case 'h':
help();
return 0;
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");
(void)umask(0177);
no_core();
lock_mem(bytes, sizeof bytes);
set_logging_parameters(log_console, log_logfile, log_syslog, log_level);
if (!do_not_fork && !show_bps)
{
if (daemon(0, 0) == -1)
error_exit("fork failed");
}
write_pid(pid_file);
signal(SIGPIPE, SIG_IGN);
signal(SIGTERM, sig_handler);
signal(SIGINT , sig_handler);
signal(SIGQUIT, sig_handler);
protocol *p = NULL;
if (!hosts.empty())
p = new protocol(&hosts, username, password, true, server_type, DEFAULT_COMM_TO);
int slp = get_clock_res();
dolog(LOG_INFO, "resolution of clock is %dns", slp);
init_showbps();
set_showbps_start_ts();
unsigned char cur_byte = 0;
int equal_cnt = 0;
for(;!do_exit;)
{
// gather random data
double t1 = gen_entropy_data(slp), t2 = gen_entropy_data(slp);
if (t1 == t2)
{
equal_cnt++;
if (equal_cnt > 5 && slp < 1000)
{
dolog(LOG_DEBUG, "increasing sleep to %dns", slp);
slp++;
}
continue;
}
equal_cnt = 0;
cur_byte <<= 1;
if (t1 >= t2)
cur_byte |= 1;
if (++bits == 8)
{
bytes[index++] = cur_byte;
bits = 0;
if (index == sizeof bytes)
{
if (show_bps)
update_showbps(sizeof bytes);
if (bytes_file)
emit_buffer_to_file(bytes_file, bytes, index);
if (p && p -> message_transmit_entropy_data(bytes, index, &do_exit) == -1)
{
dolog(LOG_INFO, "connection closed");
p -> drop();
}
set_showbps_start_ts();
index = 0; // skip header
}
}
}
memset(bytes, 0x00, sizeof bytes);
unlink(pid_file);
delete p;
return 0;
}