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client_egd.cpp
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client_egd.cpp
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#include <arpa/inet.h>
#include <string>
#include <vector>
#include <map>
#include <sys/time.h>
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <stddef.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "error.h"
#include "random_source.h"
#include "utils.h"
#include "log.h"
#include "encrypt_stream.h"
#include "hasher.h"
#include "math.h"
#include "protocol.h"
#include "statistics.h"
#include "statistics_global.h"
#include "statistics_user.h"
#include "users.h"
#include "auth.h"
#include "kernel_prng_io.h"
#define DEFAULT_COMM_TO 15
const char *pid_file = PID_DIR "/client_egd.pid";
const char *client_type = "client_egd " VERSION;
bool do_exit = false;
void sig_handler(int sig)
{
fprintf(stderr, "Exit due to signal %d\n", sig);
do_exit = true;
}
void egd_get__failure(int fd)
{
unsigned char none = 0;
if (WRITE(fd, &none, 1) != 1)
dolog(LOG_INFO, "short write on egd client (# bytes)");
}
void egd_get(int fd, protocol *p, bool blocking)
{
unsigned char n_bytes_to_get;
if (READ(fd, &n_bytes_to_get, 1) != 1)
{
dolog(LOG_INFO, "short read on EGD client");
return;
}
if (n_bytes_to_get == 0)
{
dolog(LOG_INFO, "client requesting 0 bytes");
return;
}
int n_bits_to_get = n_bytes_to_get * 8;
dolog(LOG_INFO, "will get %d bits (%sblocking)", n_bits_to_get, blocking?"":"non-");
unsigned char *buffer = static_cast<unsigned char *>(malloc(n_bytes_to_get));
if (!buffer)
error_exit("Out of memory");
lock_mem(buffer, n_bytes_to_get);
int n_bytes = p -> request_bytes(buffer, n_bits_to_get, !blocking);
if (n_bytes == 0)
egd_get__failure(fd);
else
{
unsigned char msg = std::min(255, n_bytes);
if (!blocking && WRITE(fd, &msg, 1) != 1)
dolog(LOG_INFO, "short write on egd client (# bytes)");
else if (WRITE(fd, buffer, msg) != msg)
dolog(LOG_INFO, "short write on egd client (data)");
memset(buffer, 0x00, n_bytes);
}
unlock_mem(buffer, n_bytes);
free(buffer);
}
void egd_entropy_count(int fd)
{
unsigned int count = 9999;
unsigned char reply[4];
reply[0] = (count >> 24) & 255;
reply[1] = (count >> 16) & 255;
reply[2] = (count >> 8) & 255;
reply[3] = count & 255;
if (WRITE(fd, reply, 4) != 4)
dolog(LOG_INFO, "short write on egd client");
}
void egd_put(int fd, protocol *p)
{
unsigned char cmd[3];
if (READ(fd, cmd, 3) != 3)
{
dolog(LOG_INFO, "EGD_put short read (1)");
return;
}
int bit_cnt = (cmd[0] << 8) + cmd[1];
dolog(LOG_INFO, "EGD client puts %d bits of entropy", bit_cnt);
unsigned char byte_cnt = cmd[2];
char buffer[256];
lock_mem(buffer, sizeof buffer);
if (byte_cnt > 0 && READ(fd, buffer, byte_cnt) != byte_cnt)
{
dolog(LOG_INFO, "EGD_put short read (2)");
return;
}
(void)p -> message_transmit_entropy_data(reinterpret_cast<unsigned char *>(buffer), byte_cnt);
memset(buffer, 0x00, sizeof buffer);
unlock_mem(buffer, sizeof buffer);
}
void handle_client(int fd, protocol *p)
{
for(;!do_exit;)
{
unsigned char egd_msg;
if (READ(fd, &egd_msg, 1, &do_exit) != 1)
{
dolog(LOG_INFO, "EGD client disconnected");
return;
}
if (egd_msg == 0) // get entropy count
egd_entropy_count(fd);
else if (egd_msg == 1) // get data, non blocking
egd_get(fd, p, false);
else if (egd_msg == 2) // get data, blocking
egd_get(fd, p, true);
else if (egd_msg == 3) // put data
egd_put(fd, p);
}
}
int open_unixdomain_socket(char *path, int nListen)
{
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("socket creation failed");
if (bind(fd, (struct sockaddr *)&addr, len) == -1)
error_exit("bind failed");
if (listen(fd, nListen) == -1)
error_exit("listen failed");
return fd;
}
int open_tcp_socket(const char *adapter, int port, int nListen)
{
return start_listen(adapter, port, nListen);
}
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 file egd unix domain socket\n");
printf("-t host egd tcp host to listen on\n");
printf("-T port egd tcp port to listen on\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");
}
void start_child(int fd, bool do_not_fork, struct sockaddr *ca, std::vector<std::string> *hosts, std::string username, std::string password)
{
if (fd != -1)
{
pid_t pid = 0;
if (!do_not_fork)
pid = fork();
if (pid == 0)
{
protocol *p = new protocol(hosts, username, password, false, client_type, DEFAULT_COMM_TO);
handle_client(fd, p);
delete p;
if (!do_not_fork)
exit(0);
}
else if (pid == -1)
error_exit("failed to fork");
close(fd);
}
}
int main(int argc, char *argv[])
{
int c;
bool do_not_fork = false, log_console = false, log_syslog = false;
char *log_logfile = NULL;
char *uds = NULL;
int u_listen_fd = -1, nListen = 5;
std::string username, password;
const char *egd_host = "0.0.0.0";
int egd_port = -1;
int t_listen_fd = -1;
std::vector<std::string> hosts;
int log_level = LOG_INFO;
printf("eb_client_egd v" VERSION ", (C) 2009-2015 by folkert@vanheusden.com\n");
while((c = getopt(argc, argv, "t:T:hX:P:d:I:L:l:sn")) != -1)
{
switch(c)
{
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 'X':
get_auth_from_file(optarg, username, password);
break;
case 'P':
pid_file = optarg;
break;
case 'd':
uds = 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;
default:
help();
return 1;
}
}
if (password.length() == 0 || username.length() == 0)
error_exit("please set a non-empty username + password");
if (hosts.empty())
error_exit("no host to connect to selected");
if (!uds && egd_port == -1)
error_exit("no path for the unix domain socket selected, also no tcp listen port selected");
(void)umask(0177);
no_core();
set_logging_parameters(log_console, log_logfile, log_syslog, log_level);
if (uds != NULL)
u_listen_fd = open_unixdomain_socket(uds, nListen);
if (egd_port != -1)
t_listen_fd = open_tcp_socket(egd_host, egd_port, nListen);
if (!do_not_fork)
{
if (daemon(0, 0) == -1)
error_exit("fork failed");
}
write_pid(pid_file);
signal(SIGPIPE, SIG_IGN);
signal(SIGCHLD, SIG_IGN);
signal(SIGTERM, sig_handler);
signal(SIGINT , sig_handler);
signal(SIGQUIT, sig_handler);
for(; !do_exit;)
{
fd_set a_fds;
FD_ZERO(&a_fds);
if (u_listen_fd != -1)
FD_SET(u_listen_fd, &a_fds);
if (t_listen_fd != -1)
FD_SET(t_listen_fd, &a_fds);
if (select(std::max(u_listen_fd, t_listen_fd) + 1, &a_fds, NULL, NULL, NULL) == -1)
{
if (errno != EINTR)
error_exit("select() failed");
continue;
}
struct sockaddr addr;
socklen_t addr_len = sizeof addr;
if (u_listen_fd != -1 && FD_ISSET(u_listen_fd, &a_fds))
start_child(accept(u_listen_fd, &addr, &addr_len), do_not_fork, &addr, &hosts, username, password);
if (t_listen_fd != -1 && FD_ISSET(t_listen_fd, &a_fds))
start_child(accept(t_listen_fd, &addr, &addr_len), do_not_fork, &addr, &hosts, username, password);
}
unlink(pid_file);
dolog(LOG_INFO, "Finished");
return 0;
}