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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_kernel v" VERSION;
const char *pid_file = PID_DIR "/server_kernel.pid";
#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"
#include "kernel_prng_io.h"
#include "kernel_prng_rw.h"
bool do_exit = false;
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 main(int argc, char *argv[])
{
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);
printf("Please note: this program RETRIEVES entropy data from the kernel and feeds that to the entropybroker!\n");
printf("If you want to ADD data to the kernel entropy buffer instead (which is what you most likely want to do), then use eb_client_linux_kernel\n");
while((c = getopt(argc, argv, "I:hX:P:So:L:l:sn")) != -1)
{
switch(c)
{
case 'I':
hosts.push_back(optarg);
break;
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 '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");
(void)umask(0177);
no_core();
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);
protocol *p = NULL;
if (!hosts.empty())
p = new protocol(&hosts, username, password, true, server_type, DEFAULT_COMM_TO);
signal(SIGPIPE, SIG_IGN);
signal(SIGTERM, sig_handler);
signal(SIGINT , sig_handler);
signal(SIGQUIT, sig_handler);
unsigned char bytes[4096];
lock_mem(bytes, sizeof bytes);
init_showbps();
set_showbps_start_ts();
for(;!do_exit;)
{
dolog(LOG_DEBUG, "Bits available: %d", kernel_rng_get_entropy_count());
if (kernel_rng_read_blocking(bytes, sizeof bytes) == -1)
{
dolog(LOG_WARNING, "Problem reading from kernel entropy buffer!");
if (p != NULL && p -> sleep_interruptable(5.0) != 0)
{
dolog(LOG_INFO, "connection closed");
p -> drop();
continue;
}
}
if (do_exit)
break;
if (show_bps)
update_showbps(sizeof bytes);
if (bytes_file)
emit_buffer_to_file(bytes_file, bytes, sizeof bytes);
if (p && p -> message_transmit_entropy_data(bytes, sizeof bytes, &do_exit) == -1)
{
dolog(LOG_INFO, "connection closed");
p -> drop();
continue;
}
set_showbps_start_ts();
}
memset(bytes, 0x00, sizeof bytes);
unlink(pid_file);
delete p;
return 0;
}
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