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xrdp-proprietary/tests/tcp_proxy/main.c

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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2014
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include <locale.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int g_loc_io_count = 0; // bytes read from local port
int g_rem_io_count = 0; // bytes read from remote port
static int g_terminated = 0;
static char g_buf[1024 * 32];
#define
#define
typedef unsigned short tui16;
/*****************************************************************************/
static void
g_memset(void *ptr, int val, int size)
{
memset(ptr, val, size);
}
/*****************************************************************************/
static void
g_printf(const char *format, ...)
{
va_list ap;
va_start(ap, format);
vfprintf(stdout, format, ap);
va_end(ap);
}
/*****************************************************************************/
static void
g_writeln(const char *format, ...)
{
va_list ap;
va_start(ap, format);
vfprintf(stdout, format, ap);
va_end(ap);
g_printf("\n");
}
/*****************************************************************************/
static void
g_hexdump(char *p, int len)
{
unsigned char *line;
int i;
int thisline;
int offset;
line = (unsigned char *)p;
offset = 0;
while (offset < len)
{
g_printf("%04x ", offset);
thisline = len - offset;
if (thisline > 16)
{
thisline = 16;
}
for (i = 0; i < thisline; i++)
{
g_printf("%02x ", line[i]);
}
for (; i < 16; i++)
{
g_printf(" ");
}
for (i = 0; i < thisline; i++)
{
g_printf("%c", (line[i] >= 0x20 && line[i] < 0x7f) ? line[i] : '.');
}
g_writeln("%s", "");
offset += thisline;
line += thisline;
}
}
/*****************************************************************************/
static int
g_tcp_socket(void)
{
int rv;
int option_value;
socklen_t option_len;
rv = (int)socket(AF_INET, SOCK_STREAM, 0);
if (rv < 0)
{
return -1;
}
option_len = sizeof(option_value);
if (getsockopt(rv, SOL_SOCKET, SO_REUSEADDR, (char *)&option_value,
&option_len) == 0)
{
if (option_value == 0)
{
option_value = 1;
option_len = sizeof(option_value);
setsockopt(rv, SOL_SOCKET, SO_REUSEADDR, (char *)&option_value,
option_len);
}
}
option_len = sizeof(option_value);
if (getsockopt(rv, SOL_SOCKET, SO_SNDBUF, (char *)&option_value,
&option_len) == 0)
{
if (option_value < (1024 * 32))
{
option_value = 1024 * 32;
option_len = sizeof(option_value);
setsockopt(rv, SOL_SOCKET, SO_SNDBUF, (char *)&option_value,
option_len);
}
}
return rv;
}
/*****************************************************************************/
static int
g_tcp_set_non_blocking(int sck)
{
unsigned long i;
i = fcntl(sck, F_GETFL);
i = i | O_NONBLOCK;
fcntl(sck, F_SETFL, i);
return 0;
}
/*****************************************************************************/
static int
g_tcp_bind(int sck, const char* port)
{
struct sockaddr_in s;
memset(&s, 0, sizeof(struct sockaddr_in));
s.sin_family = AF_INET;
s.sin_port = htons((tui16)atoi(port));
s.sin_addr.s_addr = INADDR_ANY;
return bind(sck, (struct sockaddr*)&s, sizeof(struct sockaddr_in));
}
/*****************************************************************************/
static int
g_tcp_listen(int sck)
{
return listen(sck, 2);
}
/*****************************************************************************/
static int
g_tcp_select(int sck1, int sck2)
{
fd_set rfds;
struct timeval time;
int max = 0;
int rv = 0;
g_memset(&rfds, 0, sizeof(fd_set));
g_memset(&time, 0, sizeof(struct timeval));
time.tv_sec = 0;
time.tv_usec = 0;
FD_ZERO(&rfds);
if (sck1 > 0)
{
FD_SET(((unsigned int)sck1), &rfds);
}
if (sck2 > 0)
{
FD_SET(((unsigned int)sck2), &rfds);
}
max = sck1;
if (sck2 > max)
{
max = sck2;
}
rv = select(max + 1, &rfds, 0, 0, &time);
if (rv > 0)
{
rv = 0;
if (FD_ISSET(((unsigned int)sck1), &rfds))
{
rv = rv | 1;
}
if (FD_ISSET(((unsigned int)sck2), &rfds))
{
rv = rv | 2;
}
}
else
{
rv = 0;
}
return rv;
}
/*****************************************************************************/
static int
g_tcp_recv(int sck, void *ptr, int len, int flags)
{
return recv(sck, ptr, len, flags);
}
/*****************************************************************************/
static void
g_tcp_close(int sck)
{
if (sck == 0)
{
return;
}
close(sck);
}
/*****************************************************************************/
static int
g_tcp_send(int sck, const void *ptr, int len, int flags)
{
return send(sck, ptr, len, flags);
}
/*****************************************************************************/
void
g_sleep(int msecs)
{
usleep(msecs * 1000);
}
/*****************************************************************************/
static int
g_tcp_last_error_would_block(int sck)
{
return (errno == EWOULDBLOCK) || (errno == EAGAIN) || (errno == EINPROGRESS);
}
/*****************************************************************************/
static int
g_tcp_accept(int sck)
{
int ret ;
struct sockaddr_in s;
unsigned int i;
i = sizeof(struct sockaddr_in);
memset(&s, 0, i);
ret = accept(sck, (struct sockaddr *)&s, &i);
return ret ;
}
/*****************************************************************************/
static int
g_tcp_connect(int sck, const char* address, const char* port)
{
struct sockaddr_in s;
struct hostent* h;
g_memset(&s, 0, sizeof(struct sockaddr_in));
s.sin_family = AF_INET;
s.sin_port = htons((tui16)atoi(port));
s.sin_addr.s_addr = inet_addr(address);
if (s.sin_addr.s_addr == INADDR_NONE)
{
h = gethostbyname(address);
if (h != 0)
{
if (h->h_name != 0)
{
if (h->h_addr_list != 0)
{
if ((*(h->h_addr_list)) != 0)
{
s.sin_addr.s_addr = *((int*)(*(h->h_addr_list)));
}
}
}
}
}
return connect(sck, (struct sockaddr*)&s, sizeof(struct sockaddr_in));
}
/*****************************************************************************/
static int
g_tcp_socket_ok(int sck)
{
int opt;
socklen_t opt_len = sizeof(opt);
if (getsockopt(sck, SOL_SOCKET, SO_ERROR, (char *)(&opt), &opt_len) == 0)
{
if (opt == 0)
{
return 1;
}
}
return 0;
}
/*****************************************************************************/
static void
g_init(const char *app_name)
{
setlocale(LC_CTYPE, "");
}
/*****************************************************************************/
static void
g_deinit(void)
{
}
/*****************************************************************************/
static int
g_tcp_can_send(int sck, int millis)
{
fd_set wfds;
struct timeval time;
int rv;
time.tv_sec = millis / 1000;
time.tv_usec = (millis * 1000) % 1000000;
FD_ZERO(&wfds);
if (sck > 0)
{
FD_SET(((unsigned int)sck), &wfds);
rv = select(sck + 1, 0, &wfds, 0, &time);
if (rv > 0)
{
return g_tcp_socket_ok(sck);
}
}
return 0;
}
/*****************************************************************************/
static void
g_signal_user_interrupt(void (*func)(int))
{
signal(SIGINT, func);
}
/*****************************************************************************/
static void
g_signal_terminate(void (*func)(int))
{
signal(SIGTERM, func);
}
/*****************************************************************************/
static void
g_signal_usr1(void (*func)(int))
{
signal(SIGUSR1, func);
}
/*****************************************************************************/
static int
g_strcasecmp(const char *c1, const char *c2)
{
return strcasecmp(c1, c2);
}
/*****************************************************************************/
static int
main_loop(char *local_port, char *remote_ip, char *remote_port, int hexdump)
{
int lis_sck;
int acc_sck;
int con_sck;
int sel;
int count;
int sent;
int error;
int i;
int acc_to_con;
int con_to_acc;
acc_to_con = 0;
con_to_acc = 0;
acc_sck = 0;
/* create the listening socket and setup options */
lis_sck = g_tcp_socket();
g_tcp_set_non_blocking(lis_sck);
error = g_tcp_bind(lis_sck, local_port);
if (error != 0)
{
g_writeln("bind failed");
}
/* listen for an incoming connection */
if (error == 0)
{
error = g_tcp_listen(lis_sck);
if (error == 0)
{
g_writeln("listening for connection");
}
}
/* accept an incoming connection */
if (error == 0)
{
while ((!g_terminated) && (error == 0))
{
acc_sck = g_tcp_accept(lis_sck);
if ((acc_sck == -1) && g_tcp_last_error_would_block(lis_sck))
{
g_sleep(100);
}
else if (acc_sck == -1)
{
error = 1;
}
else
{
break;
}
}
if (error == 0)
{
error = g_terminated;
}
/* stop listening */
g_tcp_close(lis_sck);
lis_sck = 0;
if (error == 0)
{
g_writeln("got connection");
}
}
/* connect outgoing socket */
con_sck = 0;
if (error == 0)
{
con_sck = g_tcp_socket();
g_tcp_set_non_blocking(con_sck);
error = g_tcp_connect(con_sck, remote_ip, remote_port);
if ((error == -1) && g_tcp_last_error_would_block(con_sck))
{
error = 0;
i = 0;
while ((!g_tcp_can_send(con_sck, 100)) && (!g_terminated) && (i < 100))
{
g_sleep(100);
i++;
}
if (i > 99)
{
g_writeln("timeout connecting");
error = 1;
}
if (g_terminated)
{
error = 1;
}
}
if ((error != 0) && (!g_terminated))
{
g_writeln("error connecting to remote\r\n");
}
}
while ((!g_terminated) && (error == 0))
{
sel = g_tcp_select(con_sck, acc_sck);
if (sel == 0)
{
g_sleep(10);
continue;
}
if (sel & 1)
{
// can read from con_sck w/o blocking
count = g_tcp_recv(con_sck, g_buf, 1024 * 16, 0);
error = count < 1;
if (error == 0)
{
g_loc_io_count += count;
con_to_acc += count;
if (hexdump)
{
g_writeln("from remove, the socket from connect");
g_hexdump(g_buf, count);
}
#if 0
g_writeln("local_io_count: %d\tremote_io_count: %d",
g_loc_io_count, g_rem_io_count);
#endif
sent = 0;
while ((sent < count) && (error == 0) && (!g_terminated))
{
i = g_tcp_send(acc_sck, g_buf + sent, count - sent, 0);
if ((i == -1) && g_tcp_last_error_would_block(acc_sck))
{
g_tcp_can_send(acc_sck, 1000);
}
else if (i < 1)
{
error = 1;
}
else
{
sent += i;
}
}
}
}
if (sel & 2)
{
// can read from acc_sck w/o blocking
count = g_tcp_recv(acc_sck, g_buf, 1024 * 16, 0);
error = count < 1;
if (error == 0)
{
g_rem_io_count += count;
acc_to_con += count;
if (hexdump)
{
g_writeln("from accepted, the socket from accept");
g_hexdump(g_buf, count);
}
#if 0
g_writeln("local_io_count: %d\tremote_io_count: %d",
g_loc_io_count, g_rem_io_count);
#endif
sent = 0;
while ((sent < count) && (error == 0) && (!g_terminated))
{
i = g_tcp_send(con_sck, g_buf + sent, count - sent, 0);
if ((i == -1) && g_tcp_last_error_would_block(con_sck))
{
g_tcp_can_send(con_sck, 1000);
}
else if (i < 1)
{
error = 1;
}
else
{
sent += i;
}
}
}
}
}
g_tcp_close(lis_sck);
g_tcp_close(con_sck);
g_tcp_close(acc_sck);
g_writeln("acc_to_con %d", acc_to_con);
g_writeln("con_to_acc %d", con_to_acc);
return 0;
}
/*****************************************************************************/
static int
usage(void)
{
g_writeln("tcp_proxy <local-port> <remote-ip> <remote-port> [dump]");
return 0;
}
/*****************************************************************************/
void
proxy_shutdown(int sig)
{
g_writeln("shutting down");
g_terminated = 1;
}
void
clear_counters(int sig)
{
g_writeln("cleared counters at: local_io_count: %d remote_io_count: %d",
g_loc_io_count, g_rem_io_count);
g_loc_io_count = 0;
g_rem_io_count = 0;
}
/*****************************************************************************/
int
main(int argc, char **argv)
{
int dump;
if (argc < 4)
{
usage();
return 0;
}
g_init("tcp_proxy");
g_signal_user_interrupt(proxy_shutdown); /* SIGINT */
g_signal_usr1(clear_counters); /* SIGUSR1 */
g_signal_terminate(proxy_shutdown); /* SIGTERM */
if (argc < 5)
{
while (!g_terminated)
{
g_loc_io_count = 0;
g_rem_io_count = 0;
main_loop(argv[1], argv[2], argv[3], 0);
}
}
else
{
dump = g_strcasecmp(argv[4], "dump") == 0;
while (!g_terminated)
{
main_loop(argv[1], argv[2], argv[3], dump);
}
}
g_deinit();
return 0;
}
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