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xrdp-proprietary/tests/tcp_proxy/main.c

313 lines
7.4 KiB

/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2012
*
* 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.
*/
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#include <os_calls.h>
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int g_loc_io_count = 0; // bytes read from local port
int g_rem_io_count = 0; // bytes read from remote port
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static int g_terminated = 0;
static char g_buf[1024 * 32];
/*****************************************************************************/
static int
main_loop(char *local_port, char *remote_ip, char *remote_port, int hexdump)
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{
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);
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if (error != 0)
{
g_writeln("bind failed");
}
/* listen for an incomming connection */
if (error == 0)
{
error = g_tcp_listen(lis_sck);
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if (error == 0)
{
g_writeln("listening for connection");
}
}
/* accept an incomming connection */
if (error == 0)
{
while ((!g_terminated) && (error == 0))
{
acc_sck = g_tcp_accept(lis_sck);
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if ((acc_sck == -1) && g_tcp_last_error_would_block(lis_sck))
{
g_sleep(100);
}
else if (acc_sck == -1)
{
error = 1;
}
else
{
break;
}
}
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if (error == 0)
{
error = g_terminated;
}
/* stop listening */
g_tcp_close(lis_sck);
lis_sck = 0;
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if (error == 0)
{
g_writeln("got connection");
}
}
/* connect outgoing socket */
con_sck = 0;
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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);
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if ((error == -1) && g_tcp_last_error_would_block(con_sck))
{
error = 0;
i = 0;
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while ((!g_tcp_can_send(con_sck, 100)) && (!g_terminated) && (i < 100))
{
g_sleep(100);
i++;
}
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if (i > 99)
{
g_writeln("timout connecting");
error = 1;
}
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if (g_terminated)
{
error = 1;
}
}
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if ((error != 0) && (!g_terminated))
{
g_writeln("error connecting to remote\r\n");
}
}
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while ((!g_terminated) && (error == 0))
{
sel = g_tcp_select(con_sck, acc_sck);
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if (sel == 0)
{
g_sleep(10);
continue;
}
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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;
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if (error == 0)
{
g_loc_io_count += count;
con_to_acc += count;
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if (hexdump)
{
g_writeln("from remove, the socket from connect");
g_hexdump(g_buf, count);
}
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#if 0
g_writeln("local_io_count: %d\tremote_io_count: %d",
g_loc_io_count, g_rem_io_count);
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#endif
sent = 0;
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while ((sent < count) && (error == 0) && (!g_terminated))
{
i = g_tcp_send(acc_sck, g_buf + sent, count - sent, 0);
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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;
}
}
}
}
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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;
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if (error == 0)
{
g_rem_io_count += count;
acc_to_con += count;
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if (hexdump)
{
g_writeln("from accepted, the socket from accept");
g_hexdump(g_buf, count);
}
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#if 0
g_writeln("local_io_count: %d\tremote_io_count: %d",
g_loc_io_count, g_rem_io_count);
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#endif
sent = 0;
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while ((sent < count) && (error == 0) && (!g_terminated))
{
i = g_tcp_send(con_sck, g_buf + sent, count - sent, 0);
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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;
}
}
}
}
}
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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",
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g_loc_io_count, g_rem_io_count);
g_loc_io_count = 0;
g_rem_io_count = 0;
}
/*****************************************************************************/
int
main(int argc, char **argv)
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{
int dump;
if (argc < 4)
{
usage();
return 0;
}
g_init("tcp_proxy");
g_signal_user_interrupt(proxy_shutdown); /* SIGINT */
g_signal_kill(proxy_shutdown); /* SIGKILL */
g_signal_usr1(clear_counters); /* SIGUSR1 */
g_signal_terminate(proxy_shutdown); /* SIGTERM */
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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;
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while (!g_terminated)
{
main_loop(argv[1], argv[2], argv[3], dump);
}
}
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g_deinit();
return 0;
}