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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 <stddef.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <sys/socket.h>
#include <sys/un.h>
#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"
const char *pid_file = PID_DIR "/server_egd.pid";
bool do_exit = false;
void sig_handler(int sig)
{
fprintf(stderr, "Exit due to signal %d\n", sig);
do_exit = true;
}
int open_tcp_socket(char *host, int port)
{
return connect_to(host, port);
}
int open_unixdomain_socket(char *path)
{
int len;
struct sockaddr_un addr;
int fd = -1;
if (strlen(path) >= sizeof addr.sun_path)
error_exit("Path %s too large (%d limit)", path, sizeof addr.sun_path);
memset(&addr, 0x00, sizeof addr);
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, path);
len = offsetof(struct sockaddr_un, sun_path) + strlen(path);
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd == -1)
error_exit("Failed to create socket");
if (connect(fd, (struct sockaddr *)&addr, len) == 0)
return fd;
error_exit("Failed to connect to %s", path);
return -1;
}
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 path egd unix domain socket to read from\n");
printf("-t host egd tcp host to read from (mutually exclusive from width -d)\n");
printf("-T port egd tcp port to read from\n");
printf("-o file file to write entropy data to (mututally exclusive with -i)\n");
printf("-a x bytes per interval to read from egd\n");
printf("-b x interval for reading data\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("-S show bps (mutual exclusive with -n)\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[])
{
unsigned char bytes[4096];
int read_fd = -1;
int c;
bool do_not_fork = false, log_console = false, log_syslog = false;
char *log_logfile = NULL;
char *device = NULL;
char *bytes_file = NULL;
double read_interval = 5.0;
unsigned int read_bytes_per_interval = 16;
int index = 0;
int verbose = 0;
char server_type[128];
bool show_bps = false;
std::string username, password;
char *egd_host = NULL;
int egd_port = -1;
std::vector<std::string> hosts;
int log_level = LOG_INFO;
fprintf(stderr, "eb_server_egd v" VERSION ", (C) 2009-2015 by folkert@vanheusden.com\n");
while((c = getopt(argc, argv, "I:t:T:hSX:P:a:b:o:d:L:l:snv")) != -1)
{
switch(c)
{
case 'I':
hosts.push_back(optarg);
break;
case 't':
egd_host = optarg;
break;
case 'T':
egd_port = atoi(optarg);
if (egd_port < 1)
error_exit("-T requires a value >= 1");
break;
case 'S':
show_bps = true;
break;
case 'X':
get_auth_from_file(optarg, username, password);
break;
case 'P':
pid_file = optarg;
break;
case 'v':
verbose++;
break;
case 'a':
read_bytes_per_interval = atoi(optarg);
if (read_bytes_per_interval > sizeof bytes)
error_exit("-a: parameter must be %d or less", sizeof bytes);
break;
case 'b':
read_interval = atof(optarg);
break;
case 'o':
bytes_file = 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;
case 'h':
help();
return 0;
default:
help();
return 1;
}
}
if (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 given, also no file to write to given");
if (!device && !egd_host)
error_exit( "No egd source specified: use -d or -t (and -T)" );
if (device != NULL && egd_host != NULL)
error_exit("-d and -t are mutually exclusive");
(void)umask(0177);
no_core();
lock_mem(bytes, sizeof bytes);
set_logging_parameters(log_console, log_logfile, log_syslog, log_level);
snprintf(server_type, sizeof server_type, "server_egd v" VERSION " %s", device);
protocol *p = NULL;
if (!hosts.empty())
p = new protocol(&hosts, username, password, true, server_type, DEFAULT_COMM_TO);
if (device)
{
read_fd = open_unixdomain_socket(device);
if (read_fd == -1)
error_exit("error opening %s", device);
}
else
{
read_fd = open_tcp_socket(egd_host, egd_port);
if (read_fd == -1)
error_exit("Failed to connect to %s:%d", egd_host, egd_port);
}
if (!do_not_fork)
{
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);
init_showbps();
set_showbps_start_ts();
for(;!do_exit;)
{
unsigned char request[2], reply[1];
int bytes_to_read = std::min(255u, std::min((unsigned int)(sizeof bytes - index), read_bytes_per_interval));
// gather random data from EGD
request[0] = 1;
request[1] = bytes_to_read;
if (WRITE(read_fd, request, sizeof request, &do_exit) != 2)
error_exit("Problem sending request to EGD");
if (do_exit) break;
if (READ(read_fd, reply, 1, &do_exit) != 1)
error_exit("Problem receiving reply header from EGD");
if (do_exit) break;
bytes_to_read = reply[0];
if (READ(read_fd, &bytes[index], bytes_to_read, &do_exit) != bytes_to_read)
error_exit("Problem receiving reply-data from EGD");
if (do_exit) break;
index += bytes_to_read;
dolog(LOG_DEBUG, "Got %d bytes from EGD", bytes_to_read);
////////
if (index == sizeof bytes)
{
if (show_bps)
update_showbps(sizeof bytes);
if (bytes_file)
emit_buffer_to_file(bytes_file, bytes, index);
if (p)
{
if (p -> message_transmit_entropy_data(bytes, index, &do_exit) == -1)
{
dolog(LOG_INFO, "connection closed");
p -> drop();
}
if (read_interval > 0.0 && p -> sleep_interruptable(read_interval, &do_exit) != 0)
{
dolog(LOG_INFO, "connection closed");
p -> drop();
}
}
else if (read_interval > 0.0)
{
usleep(read_interval * 1000000.0);
}
set_showbps_start_ts();
index = 0;
}
}
memset(bytes, 0x00, sizeof bytes);
unlink(pid_file);
delete p;
return 0;
}
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